Ruby: remove duplicated word

Co-authored-by: intrigus-lgtm <60750685+intrigus-lgtm@users.noreply.github.com>

.codeqlmanifest.json

@@ -1,11 +1,23 @@
-{ "provide": [ "ruby/.codeqlmanifest.json",
-                "*/ql/src/qlpack.yml",
-               "*/ql/lib/qlpack.yml",
-               "*/ql/test/qlpack.yml",
-               "cpp/ql/test/query-tests/Security/CWE/CWE-190/semmle/tainted/qlpack.yml",
-               "*/ql/examples/qlpack.yml",
-               "*/upgrades/qlpack.yml",
-               "javascript/ql/experimental/adaptivethreatmodeling/lib/qlpack.yml",
-               "javascript/ql/experimental/adaptivethreatmodeling/src/qlpack.yml",
-               "misc/legacy-support/*/qlpack.yml",
-               "misc/suite-helpers/qlpack.yml" ] }
+{
+    "provide": [
+        "*/ql/src/qlpack.yml",
+        "*/ql/lib/qlpack.yml",
+        "*/ql/test/qlpack.yml",
+        "*/ql/examples/qlpack.yml",
+        "*/upgrades/qlpack.yml",
+        "cpp/ql/test/query-tests/Security/CWE/CWE-190/semmle/tainted/qlpack.yml",
+        "javascript/ql/experimental/adaptivethreatmodeling/lib/qlpack.yml",
+        "javascript/ql/experimental/adaptivethreatmodeling/src/qlpack.yml",
+        "misc/legacy-support/*/qlpack.yml",
+        "misc/suite-helpers/qlpack.yml",
+        "ruby/extractor-pack/codeql-extractor.yml",
+        "ruby/ql/consistency-queries/qlpack.yml"
+    ],
+    "versionPolicies": {
+      "default": {
+        "requireChangeNotes": true,
+        "committedPrereleaseSuffix": "dev",
+        "committedVersion": "nextPatchRelease"
+      }
+    }
+}

.github/workflows/ruby-dataset-measure.yml

@@ -24,7 +24,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        repo: [rails/rails, discourse/discourse, spree/spree]
+        repo: [rails/rails, discourse/discourse, spree/spree, ruby/ruby]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
@@ -41,7 +41,7 @@ jobs:
       - name: Create database
         run: |
           codeql database create \
-            --search-path "${{ github.workspace }}/ruby" \
+            --search-path "${{ github.workspace }}/ruby/extractor-pack" \
             --threads 4 \
             --language ruby --source-root "${{ github.workspace }}/repo" \
             "${{ runner.temp }}/database"

.github/workflows/ruby-qltest.yml

@@ -32,14 +32,14 @@ jobs:
       - uses: ./ruby/actions/create-extractor-pack
       - name: Run QL tests
         run: |
-          codeql test run --check-databases --check-unused-labels --check-repeated-labels --check-redefined-labels --check-use-before-definition --search-path "${{ github.workspace }}/ruby" --additional-packs "${{ github.workspace }}"  --consistency-queries ql/consistency-queries ql/test
+          codeql test run --search-path "${{ github.workspace }}/ruby/extractor-pack" --check-databases --check-unused-labels --check-repeated-labels --check-redefined-labels --check-use-before-definition --consistency-queries ql/consistency-queries ql/test
         env:
           GITHUB_TOKEN: ${{ github.token }}
       - name: Check QL formatting
         run: find ql "(" -name "*.ql" -or -name "*.qll" ")" -print0 | xargs -0 codeql query format --check-only
       - name: Check QL compilation
         run: |
-          codeql query compile --check-only --threads=4 --warnings=error --search-path "${{ github.workspace }}/ruby" --additional-packs "${{ github.workspace }}" "ql/src" "ql/examples"
+          codeql query compile --check-only --threads=4 --warnings=error "ql/src" "ql/examples"
         env:
           GITHUB_TOKEN: ${{ github.token }}
       - name: Check DB upgrade scripts

config/identical-files.json

@@ -460,9 +460,10 @@
     "javascript/ql/lib/semmle/javascript/security/internal/SensitiveDataHeuristics.qll",
     "python/ql/lib/semmle/python/security/internal/SensitiveDataHeuristics.qll"
   ],
-  "ReDoS Util Python/JS": [
+  "ReDoS Util Python/JS/Ruby": [
     "javascript/ql/lib/semmle/javascript/security/performance/ReDoSUtil.qll",
-    "python/ql/lib/semmle/python/security/performance/ReDoSUtil.qll"
+    "python/ql/lib/semmle/python/security/performance/ReDoSUtil.qll",
+    "ruby/ql/lib/codeql/ruby/security/performance/ReDoSUtil.qll"
   ],
   "ReDoS Exponential Python/JS": [
     "javascript/ql/lib/semmle/javascript/security/performance/ExponentialBackTracking.qll",
@@ -471,7 +472,12 @@
   "ReDoS Polynomial Python/JS": [
     "javascript/ql/lib/semmle/javascript/security/performance/SuperlinearBackTracking.qll",
     "python/ql/lib/semmle/python/security/performance/SuperlinearBackTracking.qll",
-    "ruby/ql/lib/codeql/ruby/regexp/SuperlinearBackTracking.qll"
+    "ruby/ql/lib/codeql/ruby/security/performance/SuperlinearBackTracking.qll"
+  ],
+  "BadTagFilterQuery Python/JS/Ruby": [
+    "javascript/ql/lib/semmle/javascript/security/BadTagFilterQuery.qll",
+    "python/ql/lib/semmle/python/security/BadTagFilterQuery.qll",
+    "ruby/ql/lib/codeql/ruby/security/BadTagFilterQuery.qll"
   ],
   "CFG": [
     "csharp/ql/lib/semmle/code/csharp/controlflow/internal/ControlFlowGraphImplShared.qll",

cpp/autobuilder/Semmle.Autobuild.Cpp/Semmle.Autobuild.Cpp.csproj

@@ -17,7 +17,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Build" Version="16.9.0" />
+    <PackageReference Include="Microsoft.Build" Version="16.11.0" />
   </ItemGroup>
 
   <ItemGroup>

cpp/change-notes/2021-11-25-certificate-not-checked.md

@@ -0,0 +1,2 @@
+lgtm,codescanning
+* A new query `cpp/certificate-not-checked` has been added for C/C++. The query flags unsafe use of OpenSSL and similar libraries.

cpp/change-notes/2021-11-25-certificate-result-conflation.md

@@ -0,0 +1,2 @@
+lgtm,codescanning
+* A new query `cpp/certificate-result-conflation` has been added for C/C++. The query flags unsafe use of OpenSSL and similar libraries.

cpp/ql/lib/CHANGELOG.md

@@ -0,0 +1,7 @@
+## 0.0.4
+
+### New Features
+
+* The QL library `semmle.code.cpp.commons.Exclusions` now contains a predicate
+  `isFromSystemMacroDefinition` for identifying code that originates from a
+  macro outside the project being analyzed.

cpp/ql/lib/change-notes/released/0.0.4.md

@@ -0,0 +1,7 @@
+## 0.0.4
+
+### New Features
+
+* The QL library `semmle.code.cpp.commons.Exclusions` now contains a predicate
+  `isFromSystemMacroDefinition` for identifying code that originates from a
+  macro outside the project being analyzed.

cpp/ql/lib/codeql-pack.release.yml

@@ -0,0 +1,2 @@
+---
+lastReleaseVersion: 0.0.4

cpp/ql/lib/qlpack.yml

@@ -1,7 +1,8 @@
 name: codeql/cpp-all
-version: 0.0.2
+version: 0.0.5-dev
+groups: cpp
 dbscheme: semmlecode.cpp.dbscheme
 extractor: cpp
 library: true
 dependencies:
-  codeql/cpp-upgrades: 0.0.2
+  codeql/cpp-upgrades: ^0.0.3

cpp/ql/lib/semmle/code/cpp/commons/Printf.qll

@@ -9,6 +9,83 @@ import semmle.code.cpp.models.interfaces.FormattingFunction
 private import semmle.code.cpp.rangeanalysis.SimpleRangeAnalysis
 private import semmle.code.cpp.rangeanalysis.RangeAnalysisUtils
 
+private newtype TBufferWriteEstimationReason =
+  TNoSpecifiedEstimateReason() or
+  TTypeBoundsAnalysis() or
+  TValueFlowAnalysis()
+
+/**
+ * A reason for a specific buffer write size estimate.
+ */
+abstract class BufferWriteEstimationReason extends TBufferWriteEstimationReason {
+  /**
+   * Returns the name of the concrete class.
+   */
+  abstract string toString();
+
+  /**
+   * Returns a human readable representation of this reason.
+   */
+  abstract string getDescription();
+
+  /**
+   * Combine estimate reasons. Used to give a reason for the size of a format string
+   * conversion given reasons coming from its individual specifiers.
+   */
+  abstract BufferWriteEstimationReason combineWith(BufferWriteEstimationReason other);
+}
+
+/**
+ * No particular reason given. This is currently used for backward compatibility so that
+ * classes derived from BufferWrite and overriding `getMaxData/0` still work with the
+ * queries as intended.
+ */
+class NoSpecifiedEstimateReason extends BufferWriteEstimationReason, TNoSpecifiedEstimateReason {
+  override string toString() { result = "NoSpecifiedEstimateReason" }
+
+  override string getDescription() { result = "no reason specified" }
+
+  override BufferWriteEstimationReason combineWith(BufferWriteEstimationReason other) {
+    // this reason should not be used in format specifiers, so it should not be combined
+    // with other reasons
+    none()
+  }
+}
+
+/**
+ * The estimation comes from rough bounds just based on the type (e.g.
+ * `0 <= x < 2^32` for an unsigned 32 bit integer).
+ */
+class TypeBoundsAnalysis extends BufferWriteEstimationReason, TTypeBoundsAnalysis {
+  override string toString() { result = "TypeBoundsAnalysis" }
+
+  override string getDescription() { result = "based on type bounds" }
+
+  override BufferWriteEstimationReason combineWith(BufferWriteEstimationReason other) {
+    other != TNoSpecifiedEstimateReason() and result = TTypeBoundsAnalysis()
+  }
+}
+
+/**
+ * The estimation comes from non trivial bounds found via actual flow analysis.
+ * For example
+ * ```
+ * unsigned u = x;
+ * if (u < 1000) {
+ *    //...  <- estimation done here based on u
+ * }
+ * ```
+ */
+class ValueFlowAnalysis extends BufferWriteEstimationReason, TValueFlowAnalysis {
+  override string toString() { result = "ValueFlowAnalysis" }
+
+  override string getDescription() { result = "based on flow analysis of value bounds" }
+
+  override BufferWriteEstimationReason combineWith(BufferWriteEstimationReason other) {
+    other != TNoSpecifiedEstimateReason() and result = other
+  }
+}
+
 class PrintfFormatAttribute extends FormatAttribute {
   PrintfFormatAttribute() { this.getArchetype() = ["printf", "__printf__"] }
 }
@@ -990,7 +1067,14 @@ class FormatLiteral extends Literal {
    * conversion specifier of this format string; has no result if this cannot
    * be determined.
    */
-  int getMaxConvertedLength(int n) {
+  int getMaxConvertedLength(int n) { result = max(getMaxConvertedLength(n, _)) }
+
+  /**
+   * Gets the maximum length of the string that can be produced by the nth
+   * conversion specifier of this format string, specifying the estimation reason;
+   * has no result if this cannot be determined.
+   */
+  int getMaxConvertedLength(int n, BufferWriteEstimationReason reason) {
     exists(int len |
       (
         (
@@ -1002,10 +1086,12 @@ class FormatLiteral extends Literal {
       ) and
       (
         this.getConversionChar(n) = "%" and
-        len = 1
+        len = 1 and
+        reason = TValueFlowAnalysis()
         or
         this.getConversionChar(n).toLowerCase() = "c" and
-        len = 1 // e.g. 'a'
+        len = 1 and
+        reason = TValueFlowAnalysis() // e.g. 'a'
         or
         this.getConversionChar(n).toLowerCase() = "f" and
         exists(int dot, int afterdot |
@@ -1019,7 +1105,8 @@ class FormatLiteral extends Literal {
             afterdot = 6
           ) and
           len = 1 + 309 + dot + afterdot
-        ) // e.g. -1e308="-100000"...
+        ) and
+        reason = TTypeBoundsAnalysis() // e.g. -1e308="-100000"...
         or
         this.getConversionChar(n).toLowerCase() = "e" and
         exists(int dot, int afterdot |
@@ -1033,7 +1120,8 @@ class FormatLiteral extends Literal {
             afterdot = 6
           ) and
           len = 1 + 1 + dot + afterdot + 1 + 1 + 3
-        ) // -1e308="-1.000000e+308"
+        ) and
+        reason = TTypeBoundsAnalysis() // -1e308="-1.000000e+308"
         or
         this.getConversionChar(n).toLowerCase() = "g" and
         exists(int dot, int afterdot |
@@ -1056,67 +1144,80 @@ class FormatLiteral extends Literal {
           //       (e.g. 123456, 0.000123456 are just OK)
           //       so case %f can be at most P characters + 4 zeroes, sign, dot = P + 6
           len = (afterdot.maximum(1) + 6).maximum(1 + 1 + dot + afterdot + 1 + 1 + 3)
-        ) // (e.g. "-1.59203e-319")
+        ) and
+        reason = TTypeBoundsAnalysis() // (e.g. "-1.59203e-319")
         or
         this.getConversionChar(n).toLowerCase() = ["d", "i"] and
         // e.g. -2^31 = "-2147483648"
-        len =
-          min(float cand |
-            // The first case handles length sub-specifiers
-            // Subtract one in the exponent because one bit is for the sign.
-            // Add 1 to account for the possible sign in the output.
-            cand = 1 + lengthInBase10(2.pow(this.getIntegralDisplayType(n).getSize() * 8 - 1))
-            or
-            // The second case uses range analysis to deduce a length that's shorter than the length
-            // of the number -2^31.
-            exists(Expr arg, float lower, float upper |
-              arg = this.getUse().getConversionArgument(n) and
-              lower = lowerBound(arg.getFullyConverted()) and
-              upper = upperBound(arg.getFullyConverted())
-            |
-              cand =
-                max(int cand0 |
-                  // Include the sign bit in the length if it can be negative
-                  (
-                    if lower < 0
-                    then cand0 = 1 + lengthInBase10(lower.abs())
-                    else cand0 = lengthInBase10(lower)
-                  )
-                  or
-                  (
-                    if upper < 0
-                    then cand0 = 1 + lengthInBase10(upper.abs())
-                    else cand0 = lengthInBase10(upper)
-                  )
+        exists(float typeBasedBound, float valueBasedBound |
+          // The first case handles length sub-specifiers
+          // Subtract one in the exponent because one bit is for the sign.
+          // Add 1 to account for the possible sign in the output.
+          typeBasedBound =
+            1 + lengthInBase10(2.pow(this.getIntegralDisplayType(n).getSize() * 8 - 1)) and
+          // The second case uses range analysis to deduce a length that's shorter than the length
+          // of the number -2^31.
+          exists(Expr arg, float lower, float upper, float typeLower, float typeUpper |
+            arg = this.getUse().getConversionArgument(n) and
+            lower = lowerBound(arg.getFullyConverted()) and
+            upper = upperBound(arg.getFullyConverted()) and
+            typeLower = exprMinVal(arg.getFullyConverted()) and
+            typeUpper = exprMaxVal(arg.getFullyConverted())
+          |
+            valueBasedBound =
+              max(int cand |
+                // Include the sign bit in the length if it can be negative
+                (
+                  if lower < 0
+                  then cand = 1 + lengthInBase10(lower.abs())
+                  else cand = lengthInBase10(lower)
                 )
+                or
+                (
+                  if upper < 0
+                  then cand = 1 + lengthInBase10(upper.abs())
+                  else cand = lengthInBase10(upper)
+                )
+              ) and
+            (
+              if lower > typeLower or upper < typeUpper
+              then reason = TValueFlowAnalysis()
+              else reason = TTypeBoundsAnalysis()
             )
-          )
+          ) and
+          len = valueBasedBound.minimum(typeBasedBound)
+        )
         or
         this.getConversionChar(n).toLowerCase() = "u" and
         // e.g. 2^32 - 1 = "4294967295"
-        len =
-          min(float cand |
-            // The first case handles length sub-specifiers
-            cand = 2.pow(this.getIntegralDisplayType(n).getSize() * 8)
-            or
-            // The second case uses range analysis to deduce a length that's shorter than
-            // the length of the number 2^31 - 1.
-            exists(Expr arg, float lower |
-              arg = this.getUse().getConversionArgument(n) and
-              lower = lowerBound(arg.getFullyConverted())
-            |
-              cand =
-                max(float cand0 |
+        exists(float typeBasedBound, float valueBasedBound |
+          // The first case handles length sub-specifiers
+          typeBasedBound = lengthInBase10(2.pow(this.getIntegralDisplayType(n).getSize() * 8) - 1) and
+          // The second case uses range analysis to deduce a length that's shorter than
+          // the length of the number 2^31 - 1.
+          exists(Expr arg, float lower, float upper, float typeLower, float typeUpper |
+            arg = this.getUse().getConversionArgument(n) and
+            lower = lowerBound(arg.getFullyConverted()) and
+            upper = upperBound(arg.getFullyConverted()) and
+            typeLower = exprMinVal(arg.getFullyConverted()) and
+            typeUpper = exprMaxVal(arg.getFullyConverted())
+          |
+            valueBasedBound =
+              lengthInBase10(max(float cand |
                   // If lower can be negative we use `(unsigned)-1` as the candidate value.
                   lower < 0 and
-                  cand0 = 2.pow(any(IntType t | t.isUnsigned()).getSize() * 8)
+                  cand = 2.pow(any(IntType t | t.isUnsigned()).getSize() * 8)
                   or
-                  cand0 = upperBound(arg.getFullyConverted())
-                )
+                  cand = upper
+                )) and
+            (
+              if lower > typeLower or upper < typeUpper
+              then reason = TValueFlowAnalysis()
+              else reason = TTypeBoundsAnalysis()
             )
-          |
-            lengthInBase10(cand)
-          )
+          ) and
+          len = valueBasedBound.minimum(typeBasedBound)
+        )
         or
         this.getConversionChar(n).toLowerCase() = "x" and
         // e.g. "12345678"
@@ -1135,7 +1236,8 @@ class FormatLiteral extends Literal {
           (
             if this.hasAlternateFlag(n) then len = 2 + baseLen else len = baseLen // "0x"
           )
-        )
+        ) and
+        reason = TTypeBoundsAnalysis()
         or
         this.getConversionChar(n).toLowerCase() = "p" and
         exists(PointerType ptrType, int baseLen |
@@ -1144,7 +1246,8 @@ class FormatLiteral extends Literal {
           (
             if this.hasAlternateFlag(n) then len = 2 + baseLen else len = baseLen // "0x"
           )
-        )
+        ) and
+        reason = TValueFlowAnalysis()
         or
         this.getConversionChar(n).toLowerCase() = "o" and
         // e.g. 2^32 - 1 = "37777777777"
@@ -1163,14 +1266,16 @@ class FormatLiteral extends Literal {
           (
             if this.hasAlternateFlag(n) then len = 1 + baseLen else len = baseLen // "0"
           )
-        )
+        ) and
+        reason = TTypeBoundsAnalysis()
         or
         this.getConversionChar(n).toLowerCase() = "s" and
         len =
           min(int v |
             v = this.getPrecision(n) or
             v = this.getUse().getFormatArgument(n).(AnalysedString).getMaxLength() - 1 // (don't count null terminator)
-          )
+          ) and
+        reason = TValueFlowAnalysis()
       )
     )
   }
@@ -1182,10 +1287,19 @@ class FormatLiteral extends Literal {
    * determining whether a buffer overflow is caused by long float to string
    * conversions.
    */
-  int getMaxConvertedLengthLimited(int n) {
+  int getMaxConvertedLengthLimited(int n) { result = max(getMaxConvertedLengthLimited(n, _)) }
+
+  /**
+   * Gets the maximum length of the string that can be produced by the nth
+   * conversion specifier of this format string, specifying the reason for the
+   * estimation, except that float to string conversions are assumed to be 8
+   * characters.  This is helpful for determining whether a buffer overflow is
+   * caused by long float to string conversions.
+   */
+  int getMaxConvertedLengthLimited(int n, BufferWriteEstimationReason reason) {
     if this.getConversionChar(n).toLowerCase() = "f"
-    then result = this.getMaxConvertedLength(n).minimum(8)
-    else result = this.getMaxConvertedLength(n)
+    then result = this.getMaxConvertedLength(n, reason).minimum(8)
+    else result = this.getMaxConvertedLength(n, reason)
   }
 
   /**
@@ -1225,29 +1339,35 @@ class FormatLiteral extends Literal {
     )
   }
 
-  private int getMaxConvertedLengthAfter(int n) {
+  private int getMaxConvertedLengthAfter(int n, BufferWriteEstimationReason reason) {
     if n = this.getNumConvSpec()
-    then result = this.getConstantSuffix().length() + 1
+    then result = this.getConstantSuffix().length() + 1 and reason = TValueFlowAnalysis()
     else
-      result =
-        this.getConstantPart(n).length() + this.getMaxConvertedLength(n) +
-          this.getMaxConvertedLengthAfter(n + 1)
+      exists(BufferWriteEstimationReason headReason, BufferWriteEstimationReason tailReason |
+        result =
+          this.getConstantPart(n).length() + this.getMaxConvertedLength(n, headReason) +
+            this.getMaxConvertedLengthAfter(n + 1, tailReason) and
+        reason = headReason.combineWith(tailReason)
+      )
   }
 
-  private int getMaxConvertedLengthAfterLimited(int n) {
+  private int getMaxConvertedLengthAfterLimited(int n, BufferWriteEstimationReason reason) {
     if n = this.getNumConvSpec()
-    then result = this.getConstantSuffix().length() + 1
+    then result = this.getConstantSuffix().length() + 1 and reason = TValueFlowAnalysis()
     else
-      result =
-        this.getConstantPart(n).length() + this.getMaxConvertedLengthLimited(n) +
-          this.getMaxConvertedLengthAfterLimited(n + 1)
+      exists(BufferWriteEstimationReason headReason, BufferWriteEstimationReason tailReason |
+        result =
+          this.getConstantPart(n).length() + this.getMaxConvertedLengthLimited(n, headReason) +
+            this.getMaxConvertedLengthAfterLimited(n + 1, tailReason) and
+        reason = headReason.combineWith(tailReason)
+      )
   }
 
   /**
    * Gets the maximum length of the string that can be produced by this format
    * string.  Has no result if this cannot be determined.
    */
-  int getMaxConvertedLength() { result = this.getMaxConvertedLengthAfter(0) }
+  int getMaxConvertedLength() { result = this.getMaxConvertedLengthAfter(0, _) }
 
   /**
    * Gets the maximum length of the string that can be produced by this format
@@ -1255,5 +1375,24 @@ class FormatLiteral extends Literal {
    * characters.  This is helpful for determining whether a buffer overflow
    * is caused by long float to string conversions.
    */
-  int getMaxConvertedLengthLimited() { result = this.getMaxConvertedLengthAfterLimited(0) }
+  int getMaxConvertedLengthLimited() { result = this.getMaxConvertedLengthAfterLimited(0, _) }
+
+  /**
+   * Gets the maximum length of the string that can be produced by this format
+   * string, specifying the reason for the estimate. Has no result if no estimate
+   * can be found.
+   */
+  int getMaxConvertedLengthWithReason(BufferWriteEstimationReason reason) {
+    result = this.getMaxConvertedLengthAfter(0, reason)
+  }
+
+  /**
+   * Gets the maximum length of the string that can be produced by this format
+   * string, specifying the reason for the estimate, except that float to string
+   * conversions are assumed to be 8 characters.  This is helpful for determining
+   * whether a buffer overflow is caused by long float to string conversions.
+   */
+  int getMaxConvertedLengthLimitedWithReason(BufferWriteEstimationReason reason) {
+    result = this.getMaxConvertedLengthAfterLimited(0, reason)
+  }
 }

cpp/ql/lib/semmle/code/cpp/controlflow/internal/ConstantExprs.qll

@@ -626,9 +626,9 @@ library class ExprEvaluator extends int {
       // All assignments must have the same int value
       result =
         unique(Expr value |
-          value = v.getAnAssignedValue() and not ignoreVariableAssignment(e, v, value)
+          value = v.getAnAssignedValue() and not this.ignoreVariableAssignment(e, v, value)
         |
-          getValueInternalNonSubExpr(value)
+          this.getValueInternalNonSubExpr(value)
         )
     )
   }

cpp/ql/lib/semmle/code/cpp/dataflow/internal/DataFlowDispatch.qll

@@ -1,4 +1,6 @@
 private import cpp
+private import semmle.code.cpp.dataflow.internal.DataFlowPrivate
+private import semmle.code.cpp.dataflow.internal.DataFlowUtil
 
 /**
  * Gets a function that might be called by `call`.
@@ -63,3 +65,17 @@ predicate mayBenefitFromCallContext(Call call, Function f) { none() }
  * restricted to those `call`s for which a context might make a difference.
  */
 Function viableImplInCallContext(Call call, Call ctx) { none() }
+
+/** A parameter position represented by an integer. */
+class ParameterPosition extends int {
+  ParameterPosition() { any(ParameterNode p).isParameterOf(_, this) }
+}
+
+/** An argument position represented by an integer. */
+class ArgumentPosition extends int {
+  ArgumentPosition() { any(ArgumentNode a).argumentOf(_, this) }
+}
+
+/** Holds if arguments at position `apos` match parameters at position `ppos`. */
+pragma[inline]
+predicate parameterMatch(ParameterPosition ppos, ArgumentPosition apos) { ppos = apos }

cpp/ql/lib/semmle/code/cpp/dataflow/internal/DataFlowImpl.qll

@@ -256,11 +256,11 @@ private class ArgNodeEx extends NodeEx {
 private class ParamNodeEx extends NodeEx {
   ParamNodeEx() { this.asNode() instanceof ParamNode }
 
-  predicate isParameterOf(DataFlowCallable c, int i) {
-    this.asNode().(ParamNode).isParameterOf(c, i)
+  predicate isParameterOf(DataFlowCallable c, ParameterPosition pos) {
+    this.asNode().(ParamNode).isParameterOf(c, pos)
   }
 
-  int getPosition() { this.isParameterOf(_, result) }
+  ParameterPosition getPosition() { this.isParameterOf(_, result) }
 
   predicate allowParameterReturnInSelf() { allowParameterReturnInSelfCached(this.asNode()) }
 }
@@ -289,6 +289,7 @@ private predicate outBarrier(NodeEx node, Configuration config) {
   )
 }
 
+pragma[nomagic]
 private predicate fullBarrier(NodeEx node, Configuration config) {
   exists(Node n | node.asNode() = n |
     config.isBarrier(n)
@@ -307,11 +308,23 @@ private predicate fullBarrier(NodeEx node, Configuration config) {
 }
 
 pragma[nomagic]
-private predicate sourceNode(NodeEx node, Configuration config) { config.isSource(node.asNode()) }
+private predicate sourceNode(NodeEx node, Configuration config) {
+  config.isSource(node.asNode()) and
+  not fullBarrier(node, config)
+}
 
 pragma[nomagic]
 private predicate sinkNode(NodeEx node, Configuration config) { config.isSink(node.asNode()) }
 
+/** Provides the relevant barriers for a step from `node1` to `node2`. */
+pragma[inline]
+private predicate stepFilter(NodeEx node1, NodeEx node2, Configuration config) {
+  not outBarrier(node1, config) and
+  not inBarrier(node2, config) and
+  not fullBarrier(node1, config) and
+  not fullBarrier(node2, config)
+}
+
 /**
  * Holds if data can flow in one local step from `node1` to `node2`.
  */
@@ -320,16 +333,14 @@ private predicate localFlowStep(NodeEx node1, NodeEx node2, Configuration config
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     simpleLocalFlowStepExt(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.asNode() = n and
-    node2.isImplicitReadNode(n, false)
+    node2.isImplicitReadNode(n, false) and
+    not fullBarrier(node1, config)
   )
 }
 
@@ -342,16 +353,14 @@ private predicate additionalLocalFlowStep(NodeEx node1, NodeEx node2, Configurat
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) = getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.isImplicitReadNode(n, true) and
-    node2.asNode() = n
+    node2.asNode() = n and
+    not fullBarrier(node2, config)
   )
 }
 
@@ -363,10 +372,7 @@ private predicate jumpStep(NodeEx node1, NodeEx node2, Configuration config) {
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     jumpStepCached(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
@@ -380,16 +386,14 @@ private predicate additionalJumpStep(NodeEx node1, NodeEx node2, Configuration c
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) != getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
 
 private predicate read(NodeEx node1, Content c, NodeEx node2, Configuration config) {
-  read(node1.asNode(), c, node2.asNode())
+  read(node1.asNode(), c, node2.asNode()) and
+  stepFilter(node1, node2, config)
   or
   exists(Node n |
     node2.isImplicitReadNode(n, true) and
@@ -402,7 +406,8 @@ private predicate store(
   NodeEx node1, TypedContent tc, NodeEx node2, DataFlowType contentType, Configuration config
 ) {
   store(node1.asNode(), tc, node2.asNode(), contentType) and
-  read(_, tc.getContent(), _, config)
+  read(_, tc.getContent(), _, config) and
+  stepFilter(node1, node2, config)
 }
 
 pragma[nomagic]
@@ -451,63 +456,59 @@ private module Stage1 {
    * argument in a call.
    */
   predicate fwdFlow(NodeEx node, Cc cc, Configuration config) {
-    not fullBarrier(node, config) and
-    (
-      sourceNode(node, config) and
-      if hasSourceCallCtx(config) then cc = true else cc = false
+    sourceNode(node, config) and
+    if hasSourceCallCtx(config) then cc = true else cc = false
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      localFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      additionalLocalFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      jumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      additionalJumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    // store
+    exists(NodeEx mid |
+      useFieldFlow(config) and
+      fwdFlow(mid, cc, config) and
+      store(mid, _, node, _, config)
+    )
+    or
+    // read
+    exists(Content c |
+      fwdFlowRead(c, node, cc, config) and
+      fwdFlowConsCand(c, config)
+    )
+    or
+    // flow into a callable
+    exists(NodeEx arg |
+      fwdFlow(arg, _, config) and
+      viableParamArgEx(_, node, arg) and
+      cc = true and
+      not fullBarrier(node, config)
+    )
+    or
+    // flow out of a callable
+    exists(DataFlowCall call |
+      fwdFlowOut(call, node, false, config) and
+      cc = false
       or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        localFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        additionalLocalFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        jumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        additionalJumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      // store
-      exists(NodeEx mid |
-        useFieldFlow(config) and
-        fwdFlow(mid, cc, config) and
-        store(mid, _, node, _, config) and
-        not outBarrier(mid, config)
-      )
-      or
-      // read
-      exists(Content c |
-        fwdFlowRead(c, node, cc, config) and
-        fwdFlowConsCand(c, config) and
-        not inBarrier(node, config)
-      )
-      or
-      // flow into a callable
-      exists(NodeEx arg |
-        fwdFlow(arg, _, config) and
-        viableParamArgEx(_, node, arg) and
-        cc = true
-      )
-      or
-      // flow out of a callable
-      exists(DataFlowCall call |
-        fwdFlowOut(call, node, false, config) and
-        cc = false
-        or
-        fwdFlowOutFromArg(call, node, config) and
-        fwdFlowIsEntered(call, cc, config)
-      )
+      fwdFlowOutFromArg(call, node, config) and
+      fwdFlowIsEntered(call, cc, config)
     )
   }
 
@@ -547,7 +548,8 @@ private module Stage1 {
   private predicate fwdFlowOut(DataFlowCall call, NodeEx out, Cc cc, Configuration config) {
     exists(ReturnPosition pos |
       fwdFlowReturnPosition(pos, cc, config) and
-      viableReturnPosOutEx(call, pos, out)
+      viableReturnPosOutEx(call, pos, out) and
+      not fullBarrier(out, config)
     )
   }
 
@@ -773,6 +775,7 @@ private module Stage1 {
    * Holds if flow may enter through `p` and reach a return node making `p` a
    * candidate for the origin of a summary.
    */
+  pragma[nomagic]
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
     exists(ReturnKindExt kind |
       throughFlowNodeCand(p, config) and
@@ -1009,6 +1012,9 @@ private module Stage2 {
 
   private predicate flowIntoCall = flowIntoCallNodeCand1/5;
 
+  bindingset[node, ap]
+  private predicate filter(NodeEx node, Ap ap) { any() }
+
   bindingset[ap, contentType]
   private predicate typecheckStore(Ap ap, DataFlowType contentType) { any() }
 
@@ -1017,14 +1023,23 @@ private module Stage2 {
     PrevStage::revFlow(node, _, _, apa, config)
   }
 
+  bindingset[result, apa]
+  private ApApprox unbindApa(ApApprox apa) {
+    exists(ApApprox apa0 |
+      apa = pragma[only_bind_into](apa0) and result = pragma[only_bind_into](apa0)
+    )
+  }
+
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1037,6 +1052,13 @@ private module Stage2 {
    */
   pragma[nomagic]
   predicate fwdFlow(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
+    fwdFlow0(node, cc, argAp, ap, config) and
+    flowCand(node, unbindApa(getApprox(ap)), config) and
+    filter(node, ap)
+  }
+
+  pragma[nomagic]
+  private predicate fwdFlow0(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
     flowCand(node, _, config) and
     sourceNode(node, config) and
     (if hasSourceCallCtx(config) then cc = ccSomeCall() else cc = ccNone()) and
@@ -1107,7 +1129,7 @@ private module Stage2 {
   ) {
     exists(DataFlowType contentType |
       fwdFlow(node1, cc, argAp, ap1, config) and
-      PrevStage::storeStepCand(node1, getApprox(ap1), tc, node2, contentType, config) and
+      PrevStage::storeStepCand(node1, unbindApa(getApprox(ap1)), tc, node2, contentType, config) and
       typecheckStore(ap1, contentType)
     )
   }
@@ -1142,9 +1164,8 @@ private module Stage2 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1159,9 +1180,8 @@ private module Stage2 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1171,10 +1191,8 @@ private module Stage2 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1188,7 +1206,7 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p |
       fwdFlowIn(call, p, cc, _, argAp, ap, config) and
-      PrevStage::parameterMayFlowThrough(p, _, getApprox(ap), config)
+      PrevStage::parameterMayFlowThrough(p, _, unbindApa(getApprox(ap)), config)
     )
   }
 
@@ -1230,6 +1248,11 @@ private module Stage2 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -1306,7 +1329,7 @@ private module Stage2 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -1341,9 +1364,8 @@ private module Stage2 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1353,9 +1375,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1365,9 +1386,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1427,7 +1447,7 @@ private module Stage2 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -1707,12 +1727,14 @@ private module Stage3 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1837,9 +1859,8 @@ private module Stage3 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1854,9 +1875,8 @@ private module Stage3 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1866,10 +1886,8 @@ private module Stage3 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1925,6 +1943,11 @@ private module Stage3 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2001,7 +2024,7 @@ private module Stage3 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2036,9 +2059,8 @@ private module Stage3 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2048,9 +2070,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2060,9 +2081,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2122,7 +2142,7 @@ private module Stage3 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2473,12 +2493,14 @@ private module Stage4 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -2603,9 +2625,8 @@ private module Stage4 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2620,9 +2641,8 @@ private module Stage4 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2632,10 +2652,8 @@ private module Stage4 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2691,6 +2709,11 @@ private module Stage4 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2767,7 +2790,7 @@ private module Stage4 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2802,9 +2825,8 @@ private module Stage4 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2814,9 +2836,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2826,9 +2847,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2888,7 +2908,7 @@ private module Stage4 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2972,7 +2992,7 @@ private class SummaryCtxSome extends SummaryCtx, TSummaryCtxSome {
 
   SummaryCtxSome() { this = TSummaryCtxSome(p, ap) }
 
-  int getParameterPos() { p.isParameterOf(_, result) }
+  ParameterPosition getParameterPos() { p.isParameterOf(_, result) }
 
   ParamNodeEx getParamNode() { result = p }
 
@@ -3619,39 +3639,40 @@ private predicate pathOutOfCallable(PathNodeMid mid, NodeEx out, CallContext cc)
  */
 pragma[noinline]
 private predicate pathIntoArg(
-  PathNodeMid mid, int i, CallContext cc, DataFlowCall call, AccessPath ap, AccessPathApprox apa,
-  Configuration config
+  PathNodeMid mid, ParameterPosition ppos, CallContext cc, DataFlowCall call, AccessPath ap,
+  AccessPathApprox apa, Configuration config
 ) {
-  exists(ArgNode arg |
+  exists(ArgNode arg, ArgumentPosition apos |
     arg = mid.getNodeEx().asNode() and
     cc = mid.getCallContext() and
-    arg.argumentOf(call, i) and
+    arg.argumentOf(call, apos) and
     ap = mid.getAp() and
     apa = ap.getApprox() and
-    config = mid.getConfiguration()
+    config = mid.getConfiguration() and
+    parameterMatch(ppos, apos)
   )
 }
 
 pragma[nomagic]
 private predicate parameterCand(
-  DataFlowCallable callable, int i, AccessPathApprox apa, Configuration config
+  DataFlowCallable callable, ParameterPosition pos, AccessPathApprox apa, Configuration config
 ) {
   exists(ParamNodeEx p |
     Stage4::revFlow(p, _, _, apa, config) and
-    p.isParameterOf(callable, i)
+    p.isParameterOf(callable, pos)
   )
 }
 
 pragma[nomagic]
 private predicate pathIntoCallable0(
-  PathNodeMid mid, DataFlowCallable callable, int i, CallContext outercc, DataFlowCall call,
-  AccessPath ap, Configuration config
+  PathNodeMid mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
+  DataFlowCall call, AccessPath ap, Configuration config
 ) {
   exists(AccessPathApprox apa |
-    pathIntoArg(mid, pragma[only_bind_into](i), outercc, call, ap, pragma[only_bind_into](apa),
+    pathIntoArg(mid, pragma[only_bind_into](pos), outercc, call, ap, pragma[only_bind_into](apa),
       pragma[only_bind_into](config)) and
     callable = resolveCall(call, outercc) and
-    parameterCand(callable, pragma[only_bind_into](i), pragma[only_bind_into](apa),
+    parameterCand(callable, pragma[only_bind_into](pos), pragma[only_bind_into](apa),
       pragma[only_bind_into](config))
   )
 }
@@ -3666,9 +3687,9 @@ private predicate pathIntoCallable(
   PathNodeMid mid, ParamNodeEx p, CallContext outercc, CallContextCall innercc, SummaryCtx sc,
   DataFlowCall call, Configuration config
 ) {
-  exists(int i, DataFlowCallable callable, AccessPath ap |
-    pathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-    p.isParameterOf(callable, i) and
+  exists(ParameterPosition pos, DataFlowCallable callable, AccessPath ap |
+    pathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+    p.isParameterOf(callable, pos) and
     (
       sc = TSummaryCtxSome(p, ap)
       or
@@ -3692,7 +3713,7 @@ private predicate paramFlowsThrough(
   ReturnKindExt kind, CallContextCall cc, SummaryCtxSome sc, AccessPath ap, AccessPathApprox apa,
   Configuration config
 ) {
-  exists(PathNodeMid mid, RetNodeEx ret, int pos |
+  exists(PathNodeMid mid, RetNodeEx ret, ParameterPosition pos |
     mid.getNodeEx() = ret and
     kind = ret.getKind() and
     cc = mid.getCallContext() and
@@ -4421,24 +4442,25 @@ private module FlowExploration {
 
   pragma[noinline]
   private predicate partialPathIntoArg(
-    PartialPathNodeFwd mid, int i, CallContext cc, DataFlowCall call, PartialAccessPath ap,
-    Configuration config
+    PartialPathNodeFwd mid, ParameterPosition ppos, CallContext cc, DataFlowCall call,
+    PartialAccessPath ap, Configuration config
   ) {
-    exists(ArgNode arg |
+    exists(ArgNode arg, ArgumentPosition apos |
       arg = mid.getNodeEx().asNode() and
       cc = mid.getCallContext() and
-      arg.argumentOf(call, i) and
+      arg.argumentOf(call, apos) and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate partialPathIntoCallable0(
-    PartialPathNodeFwd mid, DataFlowCallable callable, int i, CallContext outercc,
+    PartialPathNodeFwd mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
     DataFlowCall call, PartialAccessPath ap, Configuration config
   ) {
-    partialPathIntoArg(mid, i, outercc, call, ap, config) and
+    partialPathIntoArg(mid, pos, outercc, call, ap, config) and
     callable = resolveCall(call, outercc)
   }
 
@@ -4447,9 +4469,9 @@ private module FlowExploration {
     TSummaryCtx1 sc1, TSummaryCtx2 sc2, DataFlowCall call, PartialAccessPath ap,
     Configuration config
   ) {
-    exists(int i, DataFlowCallable callable |
-      partialPathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-      p.isParameterOf(callable, i) and
+    exists(ParameterPosition pos, DataFlowCallable callable |
+      partialPathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+      p.isParameterOf(callable, pos) and
       sc1 = TSummaryCtx1Param(p) and
       sc2 = TSummaryCtx2Some(ap)
     |
@@ -4613,22 +4635,23 @@ private module FlowExploration {
 
   pragma[nomagic]
   private predicate revPartialPathFlowsThrough(
-    int pos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2, RevPartialAccessPath ap,
-    Configuration config
+    ArgumentPosition apos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2,
+    RevPartialAccessPath ap, Configuration config
   ) {
-    exists(PartialPathNodeRev mid, ParamNodeEx p |
+    exists(PartialPathNodeRev mid, ParamNodeEx p, ParameterPosition ppos |
       mid.getNodeEx() = p and
-      p.getPosition() = pos and
+      p.getPosition() = ppos and
       sc1 = mid.getSummaryCtx1() and
       sc2 = mid.getSummaryCtx2() and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate revPartialPathThroughCallable0(
-    DataFlowCall call, PartialPathNodeRev mid, int pos, RevPartialAccessPath ap,
+    DataFlowCall call, PartialPathNodeRev mid, ArgumentPosition pos, RevPartialAccessPath ap,
     Configuration config
   ) {
     exists(TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2 |
@@ -4641,7 +4664,7 @@ private module FlowExploration {
   private predicate revPartialPathThroughCallable(
     PartialPathNodeRev mid, ArgNodeEx node, RevPartialAccessPath ap, Configuration config
   ) {
-    exists(DataFlowCall call, int pos |
+    exists(DataFlowCall call, ArgumentPosition pos |
       revPartialPathThroughCallable0(call, mid, pos, ap, config) and
       node.asNode().(ArgNode).argumentOf(call, pos)
     )

cpp/ql/lib/semmle/code/cpp/dataflow/internal/DataFlowImpl2.qll

@@ -256,11 +256,11 @@ private class ArgNodeEx extends NodeEx {
 private class ParamNodeEx extends NodeEx {
   ParamNodeEx() { this.asNode() instanceof ParamNode }
 
-  predicate isParameterOf(DataFlowCallable c, int i) {
-    this.asNode().(ParamNode).isParameterOf(c, i)
+  predicate isParameterOf(DataFlowCallable c, ParameterPosition pos) {
+    this.asNode().(ParamNode).isParameterOf(c, pos)
   }
 
-  int getPosition() { this.isParameterOf(_, result) }
+  ParameterPosition getPosition() { this.isParameterOf(_, result) }
 
   predicate allowParameterReturnInSelf() { allowParameterReturnInSelfCached(this.asNode()) }
 }
@@ -289,6 +289,7 @@ private predicate outBarrier(NodeEx node, Configuration config) {
   )
 }
 
+pragma[nomagic]
 private predicate fullBarrier(NodeEx node, Configuration config) {
   exists(Node n | node.asNode() = n |
     config.isBarrier(n)
@@ -307,11 +308,23 @@ private predicate fullBarrier(NodeEx node, Configuration config) {
 }
 
 pragma[nomagic]
-private predicate sourceNode(NodeEx node, Configuration config) { config.isSource(node.asNode()) }
+private predicate sourceNode(NodeEx node, Configuration config) {
+  config.isSource(node.asNode()) and
+  not fullBarrier(node, config)
+}
 
 pragma[nomagic]
 private predicate sinkNode(NodeEx node, Configuration config) { config.isSink(node.asNode()) }
 
+/** Provides the relevant barriers for a step from `node1` to `node2`. */
+pragma[inline]
+private predicate stepFilter(NodeEx node1, NodeEx node2, Configuration config) {
+  not outBarrier(node1, config) and
+  not inBarrier(node2, config) and
+  not fullBarrier(node1, config) and
+  not fullBarrier(node2, config)
+}
+
 /**
  * Holds if data can flow in one local step from `node1` to `node2`.
  */
@@ -320,16 +333,14 @@ private predicate localFlowStep(NodeEx node1, NodeEx node2, Configuration config
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     simpleLocalFlowStepExt(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.asNode() = n and
-    node2.isImplicitReadNode(n, false)
+    node2.isImplicitReadNode(n, false) and
+    not fullBarrier(node1, config)
   )
 }
 
@@ -342,16 +353,14 @@ private predicate additionalLocalFlowStep(NodeEx node1, NodeEx node2, Configurat
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) = getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.isImplicitReadNode(n, true) and
-    node2.asNode() = n
+    node2.asNode() = n and
+    not fullBarrier(node2, config)
   )
 }
 
@@ -363,10 +372,7 @@ private predicate jumpStep(NodeEx node1, NodeEx node2, Configuration config) {
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     jumpStepCached(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
@@ -380,16 +386,14 @@ private predicate additionalJumpStep(NodeEx node1, NodeEx node2, Configuration c
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) != getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
 
 private predicate read(NodeEx node1, Content c, NodeEx node2, Configuration config) {
-  read(node1.asNode(), c, node2.asNode())
+  read(node1.asNode(), c, node2.asNode()) and
+  stepFilter(node1, node2, config)
   or
   exists(Node n |
     node2.isImplicitReadNode(n, true) and
@@ -402,7 +406,8 @@ private predicate store(
   NodeEx node1, TypedContent tc, NodeEx node2, DataFlowType contentType, Configuration config
 ) {
   store(node1.asNode(), tc, node2.asNode(), contentType) and
-  read(_, tc.getContent(), _, config)
+  read(_, tc.getContent(), _, config) and
+  stepFilter(node1, node2, config)
 }
 
 pragma[nomagic]
@@ -451,63 +456,59 @@ private module Stage1 {
    * argument in a call.
    */
   predicate fwdFlow(NodeEx node, Cc cc, Configuration config) {
-    not fullBarrier(node, config) and
-    (
-      sourceNode(node, config) and
-      if hasSourceCallCtx(config) then cc = true else cc = false
+    sourceNode(node, config) and
+    if hasSourceCallCtx(config) then cc = true else cc = false
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      localFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      additionalLocalFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      jumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      additionalJumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    // store
+    exists(NodeEx mid |
+      useFieldFlow(config) and
+      fwdFlow(mid, cc, config) and
+      store(mid, _, node, _, config)
+    )
+    or
+    // read
+    exists(Content c |
+      fwdFlowRead(c, node, cc, config) and
+      fwdFlowConsCand(c, config)
+    )
+    or
+    // flow into a callable
+    exists(NodeEx arg |
+      fwdFlow(arg, _, config) and
+      viableParamArgEx(_, node, arg) and
+      cc = true and
+      not fullBarrier(node, config)
+    )
+    or
+    // flow out of a callable
+    exists(DataFlowCall call |
+      fwdFlowOut(call, node, false, config) and
+      cc = false
       or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        localFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        additionalLocalFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        jumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        additionalJumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      // store
-      exists(NodeEx mid |
-        useFieldFlow(config) and
-        fwdFlow(mid, cc, config) and
-        store(mid, _, node, _, config) and
-        not outBarrier(mid, config)
-      )
-      or
-      // read
-      exists(Content c |
-        fwdFlowRead(c, node, cc, config) and
-        fwdFlowConsCand(c, config) and
-        not inBarrier(node, config)
-      )
-      or
-      // flow into a callable
-      exists(NodeEx arg |
-        fwdFlow(arg, _, config) and
-        viableParamArgEx(_, node, arg) and
-        cc = true
-      )
-      or
-      // flow out of a callable
-      exists(DataFlowCall call |
-        fwdFlowOut(call, node, false, config) and
-        cc = false
-        or
-        fwdFlowOutFromArg(call, node, config) and
-        fwdFlowIsEntered(call, cc, config)
-      )
+      fwdFlowOutFromArg(call, node, config) and
+      fwdFlowIsEntered(call, cc, config)
     )
   }
 
@@ -547,7 +548,8 @@ private module Stage1 {
   private predicate fwdFlowOut(DataFlowCall call, NodeEx out, Cc cc, Configuration config) {
     exists(ReturnPosition pos |
       fwdFlowReturnPosition(pos, cc, config) and
-      viableReturnPosOutEx(call, pos, out)
+      viableReturnPosOutEx(call, pos, out) and
+      not fullBarrier(out, config)
     )
   }
 
@@ -773,6 +775,7 @@ private module Stage1 {
    * Holds if flow may enter through `p` and reach a return node making `p` a
    * candidate for the origin of a summary.
    */
+  pragma[nomagic]
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
     exists(ReturnKindExt kind |
       throughFlowNodeCand(p, config) and
@@ -1009,6 +1012,9 @@ private module Stage2 {
 
   private predicate flowIntoCall = flowIntoCallNodeCand1/5;
 
+  bindingset[node, ap]
+  private predicate filter(NodeEx node, Ap ap) { any() }
+
   bindingset[ap, contentType]
   private predicate typecheckStore(Ap ap, DataFlowType contentType) { any() }
 
@@ -1017,14 +1023,23 @@ private module Stage2 {
     PrevStage::revFlow(node, _, _, apa, config)
   }
 
+  bindingset[result, apa]
+  private ApApprox unbindApa(ApApprox apa) {
+    exists(ApApprox apa0 |
+      apa = pragma[only_bind_into](apa0) and result = pragma[only_bind_into](apa0)
+    )
+  }
+
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1037,6 +1052,13 @@ private module Stage2 {
    */
   pragma[nomagic]
   predicate fwdFlow(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
+    fwdFlow0(node, cc, argAp, ap, config) and
+    flowCand(node, unbindApa(getApprox(ap)), config) and
+    filter(node, ap)
+  }
+
+  pragma[nomagic]
+  private predicate fwdFlow0(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
     flowCand(node, _, config) and
     sourceNode(node, config) and
     (if hasSourceCallCtx(config) then cc = ccSomeCall() else cc = ccNone()) and
@@ -1107,7 +1129,7 @@ private module Stage2 {
   ) {
     exists(DataFlowType contentType |
       fwdFlow(node1, cc, argAp, ap1, config) and
-      PrevStage::storeStepCand(node1, getApprox(ap1), tc, node2, contentType, config) and
+      PrevStage::storeStepCand(node1, unbindApa(getApprox(ap1)), tc, node2, contentType, config) and
       typecheckStore(ap1, contentType)
     )
   }
@@ -1142,9 +1164,8 @@ private module Stage2 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1159,9 +1180,8 @@ private module Stage2 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1171,10 +1191,8 @@ private module Stage2 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1188,7 +1206,7 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p |
       fwdFlowIn(call, p, cc, _, argAp, ap, config) and
-      PrevStage::parameterMayFlowThrough(p, _, getApprox(ap), config)
+      PrevStage::parameterMayFlowThrough(p, _, unbindApa(getApprox(ap)), config)
     )
   }
 
@@ -1230,6 +1248,11 @@ private module Stage2 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -1306,7 +1329,7 @@ private module Stage2 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -1341,9 +1364,8 @@ private module Stage2 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1353,9 +1375,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1365,9 +1386,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1427,7 +1447,7 @@ private module Stage2 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -1707,12 +1727,14 @@ private module Stage3 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1837,9 +1859,8 @@ private module Stage3 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1854,9 +1875,8 @@ private module Stage3 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1866,10 +1886,8 @@ private module Stage3 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1925,6 +1943,11 @@ private module Stage3 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2001,7 +2024,7 @@ private module Stage3 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2036,9 +2059,8 @@ private module Stage3 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2048,9 +2070,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2060,9 +2081,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2122,7 +2142,7 @@ private module Stage3 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2473,12 +2493,14 @@ private module Stage4 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -2603,9 +2625,8 @@ private module Stage4 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2620,9 +2641,8 @@ private module Stage4 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2632,10 +2652,8 @@ private module Stage4 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2691,6 +2709,11 @@ private module Stage4 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2767,7 +2790,7 @@ private module Stage4 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2802,9 +2825,8 @@ private module Stage4 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2814,9 +2836,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2826,9 +2847,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2888,7 +2908,7 @@ private module Stage4 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2972,7 +2992,7 @@ private class SummaryCtxSome extends SummaryCtx, TSummaryCtxSome {
 
   SummaryCtxSome() { this = TSummaryCtxSome(p, ap) }
 
-  int getParameterPos() { p.isParameterOf(_, result) }
+  ParameterPosition getParameterPos() { p.isParameterOf(_, result) }
 
   ParamNodeEx getParamNode() { result = p }
 
@@ -3619,39 +3639,40 @@ private predicate pathOutOfCallable(PathNodeMid mid, NodeEx out, CallContext cc)
  */
 pragma[noinline]
 private predicate pathIntoArg(
-  PathNodeMid mid, int i, CallContext cc, DataFlowCall call, AccessPath ap, AccessPathApprox apa,
-  Configuration config
+  PathNodeMid mid, ParameterPosition ppos, CallContext cc, DataFlowCall call, AccessPath ap,
+  AccessPathApprox apa, Configuration config
 ) {
-  exists(ArgNode arg |
+  exists(ArgNode arg, ArgumentPosition apos |
     arg = mid.getNodeEx().asNode() and
     cc = mid.getCallContext() and
-    arg.argumentOf(call, i) and
+    arg.argumentOf(call, apos) and
     ap = mid.getAp() and
     apa = ap.getApprox() and
-    config = mid.getConfiguration()
+    config = mid.getConfiguration() and
+    parameterMatch(ppos, apos)
   )
 }
 
 pragma[nomagic]
 private predicate parameterCand(
-  DataFlowCallable callable, int i, AccessPathApprox apa, Configuration config
+  DataFlowCallable callable, ParameterPosition pos, AccessPathApprox apa, Configuration config
 ) {
   exists(ParamNodeEx p |
     Stage4::revFlow(p, _, _, apa, config) and
-    p.isParameterOf(callable, i)
+    p.isParameterOf(callable, pos)
   )
 }
 
 pragma[nomagic]
 private predicate pathIntoCallable0(
-  PathNodeMid mid, DataFlowCallable callable, int i, CallContext outercc, DataFlowCall call,
-  AccessPath ap, Configuration config
+  PathNodeMid mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
+  DataFlowCall call, AccessPath ap, Configuration config
 ) {
   exists(AccessPathApprox apa |
-    pathIntoArg(mid, pragma[only_bind_into](i), outercc, call, ap, pragma[only_bind_into](apa),
+    pathIntoArg(mid, pragma[only_bind_into](pos), outercc, call, ap, pragma[only_bind_into](apa),
       pragma[only_bind_into](config)) and
     callable = resolveCall(call, outercc) and
-    parameterCand(callable, pragma[only_bind_into](i), pragma[only_bind_into](apa),
+    parameterCand(callable, pragma[only_bind_into](pos), pragma[only_bind_into](apa),
       pragma[only_bind_into](config))
   )
 }
@@ -3666,9 +3687,9 @@ private predicate pathIntoCallable(
   PathNodeMid mid, ParamNodeEx p, CallContext outercc, CallContextCall innercc, SummaryCtx sc,
   DataFlowCall call, Configuration config
 ) {
-  exists(int i, DataFlowCallable callable, AccessPath ap |
-    pathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-    p.isParameterOf(callable, i) and
+  exists(ParameterPosition pos, DataFlowCallable callable, AccessPath ap |
+    pathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+    p.isParameterOf(callable, pos) and
     (
       sc = TSummaryCtxSome(p, ap)
       or
@@ -3692,7 +3713,7 @@ private predicate paramFlowsThrough(
   ReturnKindExt kind, CallContextCall cc, SummaryCtxSome sc, AccessPath ap, AccessPathApprox apa,
   Configuration config
 ) {
-  exists(PathNodeMid mid, RetNodeEx ret, int pos |
+  exists(PathNodeMid mid, RetNodeEx ret, ParameterPosition pos |
     mid.getNodeEx() = ret and
     kind = ret.getKind() and
     cc = mid.getCallContext() and
@@ -4421,24 +4442,25 @@ private module FlowExploration {
 
   pragma[noinline]
   private predicate partialPathIntoArg(
-    PartialPathNodeFwd mid, int i, CallContext cc, DataFlowCall call, PartialAccessPath ap,
-    Configuration config
+    PartialPathNodeFwd mid, ParameterPosition ppos, CallContext cc, DataFlowCall call,
+    PartialAccessPath ap, Configuration config
   ) {
-    exists(ArgNode arg |
+    exists(ArgNode arg, ArgumentPosition apos |
       arg = mid.getNodeEx().asNode() and
       cc = mid.getCallContext() and
-      arg.argumentOf(call, i) and
+      arg.argumentOf(call, apos) and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate partialPathIntoCallable0(
-    PartialPathNodeFwd mid, DataFlowCallable callable, int i, CallContext outercc,
+    PartialPathNodeFwd mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
     DataFlowCall call, PartialAccessPath ap, Configuration config
   ) {
-    partialPathIntoArg(mid, i, outercc, call, ap, config) and
+    partialPathIntoArg(mid, pos, outercc, call, ap, config) and
     callable = resolveCall(call, outercc)
   }
 
@@ -4447,9 +4469,9 @@ private module FlowExploration {
     TSummaryCtx1 sc1, TSummaryCtx2 sc2, DataFlowCall call, PartialAccessPath ap,
     Configuration config
   ) {
-    exists(int i, DataFlowCallable callable |
-      partialPathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-      p.isParameterOf(callable, i) and
+    exists(ParameterPosition pos, DataFlowCallable callable |
+      partialPathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+      p.isParameterOf(callable, pos) and
       sc1 = TSummaryCtx1Param(p) and
       sc2 = TSummaryCtx2Some(ap)
     |
@@ -4613,22 +4635,23 @@ private module FlowExploration {
 
   pragma[nomagic]
   private predicate revPartialPathFlowsThrough(
-    int pos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2, RevPartialAccessPath ap,
-    Configuration config
+    ArgumentPosition apos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2,
+    RevPartialAccessPath ap, Configuration config
   ) {
-    exists(PartialPathNodeRev mid, ParamNodeEx p |
+    exists(PartialPathNodeRev mid, ParamNodeEx p, ParameterPosition ppos |
       mid.getNodeEx() = p and
-      p.getPosition() = pos and
+      p.getPosition() = ppos and
       sc1 = mid.getSummaryCtx1() and
       sc2 = mid.getSummaryCtx2() and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate revPartialPathThroughCallable0(
-    DataFlowCall call, PartialPathNodeRev mid, int pos, RevPartialAccessPath ap,
+    DataFlowCall call, PartialPathNodeRev mid, ArgumentPosition pos, RevPartialAccessPath ap,
     Configuration config
   ) {
     exists(TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2 |
@@ -4641,7 +4664,7 @@ private module FlowExploration {
   private predicate revPartialPathThroughCallable(
     PartialPathNodeRev mid, ArgNodeEx node, RevPartialAccessPath ap, Configuration config
   ) {
-    exists(DataFlowCall call, int pos |
+    exists(DataFlowCall call, ArgumentPosition pos |
       revPartialPathThroughCallable0(call, mid, pos, ap, config) and
       node.asNode().(ArgNode).argumentOf(call, pos)
     )

cpp/ql/lib/semmle/code/cpp/dataflow/internal/DataFlowImpl3.qll

@@ -256,11 +256,11 @@ private class ArgNodeEx extends NodeEx {
 private class ParamNodeEx extends NodeEx {
   ParamNodeEx() { this.asNode() instanceof ParamNode }
 
-  predicate isParameterOf(DataFlowCallable c, int i) {
-    this.asNode().(ParamNode).isParameterOf(c, i)
+  predicate isParameterOf(DataFlowCallable c, ParameterPosition pos) {
+    this.asNode().(ParamNode).isParameterOf(c, pos)
   }
 
-  int getPosition() { this.isParameterOf(_, result) }
+  ParameterPosition getPosition() { this.isParameterOf(_, result) }
 
   predicate allowParameterReturnInSelf() { allowParameterReturnInSelfCached(this.asNode()) }
 }
@@ -289,6 +289,7 @@ private predicate outBarrier(NodeEx node, Configuration config) {
   )
 }
 
+pragma[nomagic]
 private predicate fullBarrier(NodeEx node, Configuration config) {
   exists(Node n | node.asNode() = n |
     config.isBarrier(n)
@@ -307,11 +308,23 @@ private predicate fullBarrier(NodeEx node, Configuration config) {
 }
 
 pragma[nomagic]
-private predicate sourceNode(NodeEx node, Configuration config) { config.isSource(node.asNode()) }
+private predicate sourceNode(NodeEx node, Configuration config) {
+  config.isSource(node.asNode()) and
+  not fullBarrier(node, config)
+}
 
 pragma[nomagic]
 private predicate sinkNode(NodeEx node, Configuration config) { config.isSink(node.asNode()) }
 
+/** Provides the relevant barriers for a step from `node1` to `node2`. */
+pragma[inline]
+private predicate stepFilter(NodeEx node1, NodeEx node2, Configuration config) {
+  not outBarrier(node1, config) and
+  not inBarrier(node2, config) and
+  not fullBarrier(node1, config) and
+  not fullBarrier(node2, config)
+}
+
 /**
  * Holds if data can flow in one local step from `node1` to `node2`.
  */
@@ -320,16 +333,14 @@ private predicate localFlowStep(NodeEx node1, NodeEx node2, Configuration config
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     simpleLocalFlowStepExt(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.asNode() = n and
-    node2.isImplicitReadNode(n, false)
+    node2.isImplicitReadNode(n, false) and
+    not fullBarrier(node1, config)
   )
 }
 
@@ -342,16 +353,14 @@ private predicate additionalLocalFlowStep(NodeEx node1, NodeEx node2, Configurat
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) = getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.isImplicitReadNode(n, true) and
-    node2.asNode() = n
+    node2.asNode() = n and
+    not fullBarrier(node2, config)
   )
 }
 
@@ -363,10 +372,7 @@ private predicate jumpStep(NodeEx node1, NodeEx node2, Configuration config) {
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     jumpStepCached(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
@@ -380,16 +386,14 @@ private predicate additionalJumpStep(NodeEx node1, NodeEx node2, Configuration c
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) != getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
 
 private predicate read(NodeEx node1, Content c, NodeEx node2, Configuration config) {
-  read(node1.asNode(), c, node2.asNode())
+  read(node1.asNode(), c, node2.asNode()) and
+  stepFilter(node1, node2, config)
   or
   exists(Node n |
     node2.isImplicitReadNode(n, true) and
@@ -402,7 +406,8 @@ private predicate store(
   NodeEx node1, TypedContent tc, NodeEx node2, DataFlowType contentType, Configuration config
 ) {
   store(node1.asNode(), tc, node2.asNode(), contentType) and
-  read(_, tc.getContent(), _, config)
+  read(_, tc.getContent(), _, config) and
+  stepFilter(node1, node2, config)
 }
 
 pragma[nomagic]
@@ -451,63 +456,59 @@ private module Stage1 {
    * argument in a call.
    */
   predicate fwdFlow(NodeEx node, Cc cc, Configuration config) {
-    not fullBarrier(node, config) and
-    (
-      sourceNode(node, config) and
-      if hasSourceCallCtx(config) then cc = true else cc = false
+    sourceNode(node, config) and
+    if hasSourceCallCtx(config) then cc = true else cc = false
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      localFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      additionalLocalFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      jumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      additionalJumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    // store
+    exists(NodeEx mid |
+      useFieldFlow(config) and
+      fwdFlow(mid, cc, config) and
+      store(mid, _, node, _, config)
+    )
+    or
+    // read
+    exists(Content c |
+      fwdFlowRead(c, node, cc, config) and
+      fwdFlowConsCand(c, config)
+    )
+    or
+    // flow into a callable
+    exists(NodeEx arg |
+      fwdFlow(arg, _, config) and
+      viableParamArgEx(_, node, arg) and
+      cc = true and
+      not fullBarrier(node, config)
+    )
+    or
+    // flow out of a callable
+    exists(DataFlowCall call |
+      fwdFlowOut(call, node, false, config) and
+      cc = false
       or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        localFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        additionalLocalFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        jumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        additionalJumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      // store
-      exists(NodeEx mid |
-        useFieldFlow(config) and
-        fwdFlow(mid, cc, config) and
-        store(mid, _, node, _, config) and
-        not outBarrier(mid, config)
-      )
-      or
-      // read
-      exists(Content c |
-        fwdFlowRead(c, node, cc, config) and
-        fwdFlowConsCand(c, config) and
-        not inBarrier(node, config)
-      )
-      or
-      // flow into a callable
-      exists(NodeEx arg |
-        fwdFlow(arg, _, config) and
-        viableParamArgEx(_, node, arg) and
-        cc = true
-      )
-      or
-      // flow out of a callable
-      exists(DataFlowCall call |
-        fwdFlowOut(call, node, false, config) and
-        cc = false
-        or
-        fwdFlowOutFromArg(call, node, config) and
-        fwdFlowIsEntered(call, cc, config)
-      )
+      fwdFlowOutFromArg(call, node, config) and
+      fwdFlowIsEntered(call, cc, config)
     )
   }
 
@@ -547,7 +548,8 @@ private module Stage1 {
   private predicate fwdFlowOut(DataFlowCall call, NodeEx out, Cc cc, Configuration config) {
     exists(ReturnPosition pos |
       fwdFlowReturnPosition(pos, cc, config) and
-      viableReturnPosOutEx(call, pos, out)
+      viableReturnPosOutEx(call, pos, out) and
+      not fullBarrier(out, config)
     )
   }
 
@@ -773,6 +775,7 @@ private module Stage1 {
    * Holds if flow may enter through `p` and reach a return node making `p` a
    * candidate for the origin of a summary.
    */
+  pragma[nomagic]
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
     exists(ReturnKindExt kind |
       throughFlowNodeCand(p, config) and
@@ -1009,6 +1012,9 @@ private module Stage2 {
 
   private predicate flowIntoCall = flowIntoCallNodeCand1/5;
 
+  bindingset[node, ap]
+  private predicate filter(NodeEx node, Ap ap) { any() }
+
   bindingset[ap, contentType]
   private predicate typecheckStore(Ap ap, DataFlowType contentType) { any() }
 
@@ -1017,14 +1023,23 @@ private module Stage2 {
     PrevStage::revFlow(node, _, _, apa, config)
   }
 
+  bindingset[result, apa]
+  private ApApprox unbindApa(ApApprox apa) {
+    exists(ApApprox apa0 |
+      apa = pragma[only_bind_into](apa0) and result = pragma[only_bind_into](apa0)
+    )
+  }
+
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1037,6 +1052,13 @@ private module Stage2 {
    */
   pragma[nomagic]
   predicate fwdFlow(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
+    fwdFlow0(node, cc, argAp, ap, config) and
+    flowCand(node, unbindApa(getApprox(ap)), config) and
+    filter(node, ap)
+  }
+
+  pragma[nomagic]
+  private predicate fwdFlow0(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
     flowCand(node, _, config) and
     sourceNode(node, config) and
     (if hasSourceCallCtx(config) then cc = ccSomeCall() else cc = ccNone()) and
@@ -1107,7 +1129,7 @@ private module Stage2 {
   ) {
     exists(DataFlowType contentType |
       fwdFlow(node1, cc, argAp, ap1, config) and
-      PrevStage::storeStepCand(node1, getApprox(ap1), tc, node2, contentType, config) and
+      PrevStage::storeStepCand(node1, unbindApa(getApprox(ap1)), tc, node2, contentType, config) and
       typecheckStore(ap1, contentType)
     )
   }
@@ -1142,9 +1164,8 @@ private module Stage2 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1159,9 +1180,8 @@ private module Stage2 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1171,10 +1191,8 @@ private module Stage2 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1188,7 +1206,7 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p |
       fwdFlowIn(call, p, cc, _, argAp, ap, config) and
-      PrevStage::parameterMayFlowThrough(p, _, getApprox(ap), config)
+      PrevStage::parameterMayFlowThrough(p, _, unbindApa(getApprox(ap)), config)
     )
   }
 
@@ -1230,6 +1248,11 @@ private module Stage2 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -1306,7 +1329,7 @@ private module Stage2 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -1341,9 +1364,8 @@ private module Stage2 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1353,9 +1375,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1365,9 +1386,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1427,7 +1447,7 @@ private module Stage2 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -1707,12 +1727,14 @@ private module Stage3 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1837,9 +1859,8 @@ private module Stage3 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1854,9 +1875,8 @@ private module Stage3 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1866,10 +1886,8 @@ private module Stage3 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1925,6 +1943,11 @@ private module Stage3 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2001,7 +2024,7 @@ private module Stage3 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2036,9 +2059,8 @@ private module Stage3 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2048,9 +2070,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2060,9 +2081,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2122,7 +2142,7 @@ private module Stage3 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2473,12 +2493,14 @@ private module Stage4 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -2603,9 +2625,8 @@ private module Stage4 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2620,9 +2641,8 @@ private module Stage4 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2632,10 +2652,8 @@ private module Stage4 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2691,6 +2709,11 @@ private module Stage4 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2767,7 +2790,7 @@ private module Stage4 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2802,9 +2825,8 @@ private module Stage4 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2814,9 +2836,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2826,9 +2847,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2888,7 +2908,7 @@ private module Stage4 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2972,7 +2992,7 @@ private class SummaryCtxSome extends SummaryCtx, TSummaryCtxSome {
 
   SummaryCtxSome() { this = TSummaryCtxSome(p, ap) }
 
-  int getParameterPos() { p.isParameterOf(_, result) }
+  ParameterPosition getParameterPos() { p.isParameterOf(_, result) }
 
   ParamNodeEx getParamNode() { result = p }
 
@@ -3619,39 +3639,40 @@ private predicate pathOutOfCallable(PathNodeMid mid, NodeEx out, CallContext cc)
  */
 pragma[noinline]
 private predicate pathIntoArg(
-  PathNodeMid mid, int i, CallContext cc, DataFlowCall call, AccessPath ap, AccessPathApprox apa,
-  Configuration config
+  PathNodeMid mid, ParameterPosition ppos, CallContext cc, DataFlowCall call, AccessPath ap,
+  AccessPathApprox apa, Configuration config
 ) {
-  exists(ArgNode arg |
+  exists(ArgNode arg, ArgumentPosition apos |
     arg = mid.getNodeEx().asNode() and
     cc = mid.getCallContext() and
-    arg.argumentOf(call, i) and
+    arg.argumentOf(call, apos) and
     ap = mid.getAp() and
     apa = ap.getApprox() and
-    config = mid.getConfiguration()
+    config = mid.getConfiguration() and
+    parameterMatch(ppos, apos)
   )
 }
 
 pragma[nomagic]
 private predicate parameterCand(
-  DataFlowCallable callable, int i, AccessPathApprox apa, Configuration config
+  DataFlowCallable callable, ParameterPosition pos, AccessPathApprox apa, Configuration config
 ) {
   exists(ParamNodeEx p |
     Stage4::revFlow(p, _, _, apa, config) and
-    p.isParameterOf(callable, i)
+    p.isParameterOf(callable, pos)
   )
 }
 
 pragma[nomagic]
 private predicate pathIntoCallable0(
-  PathNodeMid mid, DataFlowCallable callable, int i, CallContext outercc, DataFlowCall call,
-  AccessPath ap, Configuration config
+  PathNodeMid mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
+  DataFlowCall call, AccessPath ap, Configuration config
 ) {
   exists(AccessPathApprox apa |
-    pathIntoArg(mid, pragma[only_bind_into](i), outercc, call, ap, pragma[only_bind_into](apa),
+    pathIntoArg(mid, pragma[only_bind_into](pos), outercc, call, ap, pragma[only_bind_into](apa),
       pragma[only_bind_into](config)) and
     callable = resolveCall(call, outercc) and
-    parameterCand(callable, pragma[only_bind_into](i), pragma[only_bind_into](apa),
+    parameterCand(callable, pragma[only_bind_into](pos), pragma[only_bind_into](apa),
       pragma[only_bind_into](config))
   )
 }
@@ -3666,9 +3687,9 @@ private predicate pathIntoCallable(
   PathNodeMid mid, ParamNodeEx p, CallContext outercc, CallContextCall innercc, SummaryCtx sc,
   DataFlowCall call, Configuration config
 ) {
-  exists(int i, DataFlowCallable callable, AccessPath ap |
-    pathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-    p.isParameterOf(callable, i) and
+  exists(ParameterPosition pos, DataFlowCallable callable, AccessPath ap |
+    pathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+    p.isParameterOf(callable, pos) and
     (
       sc = TSummaryCtxSome(p, ap)
       or
@@ -3692,7 +3713,7 @@ private predicate paramFlowsThrough(
   ReturnKindExt kind, CallContextCall cc, SummaryCtxSome sc, AccessPath ap, AccessPathApprox apa,
   Configuration config
 ) {
-  exists(PathNodeMid mid, RetNodeEx ret, int pos |
+  exists(PathNodeMid mid, RetNodeEx ret, ParameterPosition pos |
     mid.getNodeEx() = ret and
     kind = ret.getKind() and
     cc = mid.getCallContext() and
@@ -4421,24 +4442,25 @@ private module FlowExploration {
 
   pragma[noinline]
   private predicate partialPathIntoArg(
-    PartialPathNodeFwd mid, int i, CallContext cc, DataFlowCall call, PartialAccessPath ap,
-    Configuration config
+    PartialPathNodeFwd mid, ParameterPosition ppos, CallContext cc, DataFlowCall call,
+    PartialAccessPath ap, Configuration config
   ) {
-    exists(ArgNode arg |
+    exists(ArgNode arg, ArgumentPosition apos |
       arg = mid.getNodeEx().asNode() and
       cc = mid.getCallContext() and
-      arg.argumentOf(call, i) and
+      arg.argumentOf(call, apos) and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate partialPathIntoCallable0(
-    PartialPathNodeFwd mid, DataFlowCallable callable, int i, CallContext outercc,
+    PartialPathNodeFwd mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
     DataFlowCall call, PartialAccessPath ap, Configuration config
   ) {
-    partialPathIntoArg(mid, i, outercc, call, ap, config) and
+    partialPathIntoArg(mid, pos, outercc, call, ap, config) and
     callable = resolveCall(call, outercc)
   }
 
@@ -4447,9 +4469,9 @@ private module FlowExploration {
     TSummaryCtx1 sc1, TSummaryCtx2 sc2, DataFlowCall call, PartialAccessPath ap,
     Configuration config
   ) {
-    exists(int i, DataFlowCallable callable |
-      partialPathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-      p.isParameterOf(callable, i) and
+    exists(ParameterPosition pos, DataFlowCallable callable |
+      partialPathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+      p.isParameterOf(callable, pos) and
       sc1 = TSummaryCtx1Param(p) and
       sc2 = TSummaryCtx2Some(ap)
     |
@@ -4613,22 +4635,23 @@ private module FlowExploration {
 
   pragma[nomagic]
   private predicate revPartialPathFlowsThrough(
-    int pos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2, RevPartialAccessPath ap,
-    Configuration config
+    ArgumentPosition apos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2,
+    RevPartialAccessPath ap, Configuration config
   ) {
-    exists(PartialPathNodeRev mid, ParamNodeEx p |
+    exists(PartialPathNodeRev mid, ParamNodeEx p, ParameterPosition ppos |
       mid.getNodeEx() = p and
-      p.getPosition() = pos and
+      p.getPosition() = ppos and
       sc1 = mid.getSummaryCtx1() and
       sc2 = mid.getSummaryCtx2() and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate revPartialPathThroughCallable0(
-    DataFlowCall call, PartialPathNodeRev mid, int pos, RevPartialAccessPath ap,
+    DataFlowCall call, PartialPathNodeRev mid, ArgumentPosition pos, RevPartialAccessPath ap,
     Configuration config
   ) {
     exists(TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2 |
@@ -4641,7 +4664,7 @@ private module FlowExploration {
   private predicate revPartialPathThroughCallable(
     PartialPathNodeRev mid, ArgNodeEx node, RevPartialAccessPath ap, Configuration config
   ) {
-    exists(DataFlowCall call, int pos |
+    exists(DataFlowCall call, ArgumentPosition pos |
       revPartialPathThroughCallable0(call, mid, pos, ap, config) and
       node.asNode().(ArgNode).argumentOf(call, pos)
     )

cpp/ql/lib/semmle/code/cpp/dataflow/internal/DataFlowImpl4.qll

@@ -256,11 +256,11 @@ private class ArgNodeEx extends NodeEx {
 private class ParamNodeEx extends NodeEx {
   ParamNodeEx() { this.asNode() instanceof ParamNode }
 
-  predicate isParameterOf(DataFlowCallable c, int i) {
-    this.asNode().(ParamNode).isParameterOf(c, i)
+  predicate isParameterOf(DataFlowCallable c, ParameterPosition pos) {
+    this.asNode().(ParamNode).isParameterOf(c, pos)
   }
 
-  int getPosition() { this.isParameterOf(_, result) }
+  ParameterPosition getPosition() { this.isParameterOf(_, result) }
 
   predicate allowParameterReturnInSelf() { allowParameterReturnInSelfCached(this.asNode()) }
 }
@@ -289,6 +289,7 @@ private predicate outBarrier(NodeEx node, Configuration config) {
   )
 }
 
+pragma[nomagic]
 private predicate fullBarrier(NodeEx node, Configuration config) {
   exists(Node n | node.asNode() = n |
     config.isBarrier(n)
@@ -307,11 +308,23 @@ private predicate fullBarrier(NodeEx node, Configuration config) {
 }
 
 pragma[nomagic]
-private predicate sourceNode(NodeEx node, Configuration config) { config.isSource(node.asNode()) }
+private predicate sourceNode(NodeEx node, Configuration config) {
+  config.isSource(node.asNode()) and
+  not fullBarrier(node, config)
+}
 
 pragma[nomagic]
 private predicate sinkNode(NodeEx node, Configuration config) { config.isSink(node.asNode()) }
 
+/** Provides the relevant barriers for a step from `node1` to `node2`. */
+pragma[inline]
+private predicate stepFilter(NodeEx node1, NodeEx node2, Configuration config) {
+  not outBarrier(node1, config) and
+  not inBarrier(node2, config) and
+  not fullBarrier(node1, config) and
+  not fullBarrier(node2, config)
+}
+
 /**
  * Holds if data can flow in one local step from `node1` to `node2`.
  */
@@ -320,16 +333,14 @@ private predicate localFlowStep(NodeEx node1, NodeEx node2, Configuration config
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     simpleLocalFlowStepExt(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.asNode() = n and
-    node2.isImplicitReadNode(n, false)
+    node2.isImplicitReadNode(n, false) and
+    not fullBarrier(node1, config)
   )
 }
 
@@ -342,16 +353,14 @@ private predicate additionalLocalFlowStep(NodeEx node1, NodeEx node2, Configurat
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) = getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.isImplicitReadNode(n, true) and
-    node2.asNode() = n
+    node2.asNode() = n and
+    not fullBarrier(node2, config)
   )
 }
 
@@ -363,10 +372,7 @@ private predicate jumpStep(NodeEx node1, NodeEx node2, Configuration config) {
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     jumpStepCached(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
@@ -380,16 +386,14 @@ private predicate additionalJumpStep(NodeEx node1, NodeEx node2, Configuration c
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) != getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
 
 private predicate read(NodeEx node1, Content c, NodeEx node2, Configuration config) {
-  read(node1.asNode(), c, node2.asNode())
+  read(node1.asNode(), c, node2.asNode()) and
+  stepFilter(node1, node2, config)
   or
   exists(Node n |
     node2.isImplicitReadNode(n, true) and
@@ -402,7 +406,8 @@ private predicate store(
   NodeEx node1, TypedContent tc, NodeEx node2, DataFlowType contentType, Configuration config
 ) {
   store(node1.asNode(), tc, node2.asNode(), contentType) and
-  read(_, tc.getContent(), _, config)
+  read(_, tc.getContent(), _, config) and
+  stepFilter(node1, node2, config)
 }
 
 pragma[nomagic]
@@ -451,63 +456,59 @@ private module Stage1 {
    * argument in a call.
    */
   predicate fwdFlow(NodeEx node, Cc cc, Configuration config) {
-    not fullBarrier(node, config) and
-    (
-      sourceNode(node, config) and
-      if hasSourceCallCtx(config) then cc = true else cc = false
+    sourceNode(node, config) and
+    if hasSourceCallCtx(config) then cc = true else cc = false
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      localFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      additionalLocalFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      jumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      additionalJumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    // store
+    exists(NodeEx mid |
+      useFieldFlow(config) and
+      fwdFlow(mid, cc, config) and
+      store(mid, _, node, _, config)
+    )
+    or
+    // read
+    exists(Content c |
+      fwdFlowRead(c, node, cc, config) and
+      fwdFlowConsCand(c, config)
+    )
+    or
+    // flow into a callable
+    exists(NodeEx arg |
+      fwdFlow(arg, _, config) and
+      viableParamArgEx(_, node, arg) and
+      cc = true and
+      not fullBarrier(node, config)
+    )
+    or
+    // flow out of a callable
+    exists(DataFlowCall call |
+      fwdFlowOut(call, node, false, config) and
+      cc = false
       or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        localFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        additionalLocalFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        jumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        additionalJumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      // store
-      exists(NodeEx mid |
-        useFieldFlow(config) and
-        fwdFlow(mid, cc, config) and
-        store(mid, _, node, _, config) and
-        not outBarrier(mid, config)
-      )
-      or
-      // read
-      exists(Content c |
-        fwdFlowRead(c, node, cc, config) and
-        fwdFlowConsCand(c, config) and
-        not inBarrier(node, config)
-      )
-      or
-      // flow into a callable
-      exists(NodeEx arg |
-        fwdFlow(arg, _, config) and
-        viableParamArgEx(_, node, arg) and
-        cc = true
-      )
-      or
-      // flow out of a callable
-      exists(DataFlowCall call |
-        fwdFlowOut(call, node, false, config) and
-        cc = false
-        or
-        fwdFlowOutFromArg(call, node, config) and
-        fwdFlowIsEntered(call, cc, config)
-      )
+      fwdFlowOutFromArg(call, node, config) and
+      fwdFlowIsEntered(call, cc, config)
     )
   }
 
@@ -547,7 +548,8 @@ private module Stage1 {
   private predicate fwdFlowOut(DataFlowCall call, NodeEx out, Cc cc, Configuration config) {
     exists(ReturnPosition pos |
       fwdFlowReturnPosition(pos, cc, config) and
-      viableReturnPosOutEx(call, pos, out)
+      viableReturnPosOutEx(call, pos, out) and
+      not fullBarrier(out, config)
     )
   }
 
@@ -773,6 +775,7 @@ private module Stage1 {
    * Holds if flow may enter through `p` and reach a return node making `p` a
    * candidate for the origin of a summary.
    */
+  pragma[nomagic]
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
     exists(ReturnKindExt kind |
       throughFlowNodeCand(p, config) and
@@ -1009,6 +1012,9 @@ private module Stage2 {
 
   private predicate flowIntoCall = flowIntoCallNodeCand1/5;
 
+  bindingset[node, ap]
+  private predicate filter(NodeEx node, Ap ap) { any() }
+
   bindingset[ap, contentType]
   private predicate typecheckStore(Ap ap, DataFlowType contentType) { any() }
 
@@ -1017,14 +1023,23 @@ private module Stage2 {
     PrevStage::revFlow(node, _, _, apa, config)
   }
 
+  bindingset[result, apa]
+  private ApApprox unbindApa(ApApprox apa) {
+    exists(ApApprox apa0 |
+      apa = pragma[only_bind_into](apa0) and result = pragma[only_bind_into](apa0)
+    )
+  }
+
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1037,6 +1052,13 @@ private module Stage2 {
    */
   pragma[nomagic]
   predicate fwdFlow(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
+    fwdFlow0(node, cc, argAp, ap, config) and
+    flowCand(node, unbindApa(getApprox(ap)), config) and
+    filter(node, ap)
+  }
+
+  pragma[nomagic]
+  private predicate fwdFlow0(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
     flowCand(node, _, config) and
     sourceNode(node, config) and
     (if hasSourceCallCtx(config) then cc = ccSomeCall() else cc = ccNone()) and
@@ -1107,7 +1129,7 @@ private module Stage2 {
   ) {
     exists(DataFlowType contentType |
       fwdFlow(node1, cc, argAp, ap1, config) and
-      PrevStage::storeStepCand(node1, getApprox(ap1), tc, node2, contentType, config) and
+      PrevStage::storeStepCand(node1, unbindApa(getApprox(ap1)), tc, node2, contentType, config) and
       typecheckStore(ap1, contentType)
     )
   }
@@ -1142,9 +1164,8 @@ private module Stage2 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1159,9 +1180,8 @@ private module Stage2 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1171,10 +1191,8 @@ private module Stage2 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1188,7 +1206,7 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p |
       fwdFlowIn(call, p, cc, _, argAp, ap, config) and
-      PrevStage::parameterMayFlowThrough(p, _, getApprox(ap), config)
+      PrevStage::parameterMayFlowThrough(p, _, unbindApa(getApprox(ap)), config)
     )
   }
 
@@ -1230,6 +1248,11 @@ private module Stage2 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -1306,7 +1329,7 @@ private module Stage2 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -1341,9 +1364,8 @@ private module Stage2 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1353,9 +1375,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1365,9 +1386,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1427,7 +1447,7 @@ private module Stage2 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -1707,12 +1727,14 @@ private module Stage3 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1837,9 +1859,8 @@ private module Stage3 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1854,9 +1875,8 @@ private module Stage3 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1866,10 +1886,8 @@ private module Stage3 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1925,6 +1943,11 @@ private module Stage3 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2001,7 +2024,7 @@ private module Stage3 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2036,9 +2059,8 @@ private module Stage3 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2048,9 +2070,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2060,9 +2081,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2122,7 +2142,7 @@ private module Stage3 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2473,12 +2493,14 @@ private module Stage4 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -2603,9 +2625,8 @@ private module Stage4 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2620,9 +2641,8 @@ private module Stage4 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2632,10 +2652,8 @@ private module Stage4 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2691,6 +2709,11 @@ private module Stage4 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2767,7 +2790,7 @@ private module Stage4 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2802,9 +2825,8 @@ private module Stage4 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2814,9 +2836,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2826,9 +2847,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2888,7 +2908,7 @@ private module Stage4 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2972,7 +2992,7 @@ private class SummaryCtxSome extends SummaryCtx, TSummaryCtxSome {
 
   SummaryCtxSome() { this = TSummaryCtxSome(p, ap) }
 
-  int getParameterPos() { p.isParameterOf(_, result) }
+  ParameterPosition getParameterPos() { p.isParameterOf(_, result) }
 
   ParamNodeEx getParamNode() { result = p }
 
@@ -3619,39 +3639,40 @@ private predicate pathOutOfCallable(PathNodeMid mid, NodeEx out, CallContext cc)
  */
 pragma[noinline]
 private predicate pathIntoArg(
-  PathNodeMid mid, int i, CallContext cc, DataFlowCall call, AccessPath ap, AccessPathApprox apa,
-  Configuration config
+  PathNodeMid mid, ParameterPosition ppos, CallContext cc, DataFlowCall call, AccessPath ap,
+  AccessPathApprox apa, Configuration config
 ) {
-  exists(ArgNode arg |
+  exists(ArgNode arg, ArgumentPosition apos |
     arg = mid.getNodeEx().asNode() and
     cc = mid.getCallContext() and
-    arg.argumentOf(call, i) and
+    arg.argumentOf(call, apos) and
     ap = mid.getAp() and
     apa = ap.getApprox() and
-    config = mid.getConfiguration()
+    config = mid.getConfiguration() and
+    parameterMatch(ppos, apos)
   )
 }
 
 pragma[nomagic]
 private predicate parameterCand(
-  DataFlowCallable callable, int i, AccessPathApprox apa, Configuration config
+  DataFlowCallable callable, ParameterPosition pos, AccessPathApprox apa, Configuration config
 ) {
   exists(ParamNodeEx p |
     Stage4::revFlow(p, _, _, apa, config) and
-    p.isParameterOf(callable, i)
+    p.isParameterOf(callable, pos)
   )
 }
 
 pragma[nomagic]
 private predicate pathIntoCallable0(
-  PathNodeMid mid, DataFlowCallable callable, int i, CallContext outercc, DataFlowCall call,
-  AccessPath ap, Configuration config
+  PathNodeMid mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
+  DataFlowCall call, AccessPath ap, Configuration config
 ) {
   exists(AccessPathApprox apa |
-    pathIntoArg(mid, pragma[only_bind_into](i), outercc, call, ap, pragma[only_bind_into](apa),
+    pathIntoArg(mid, pragma[only_bind_into](pos), outercc, call, ap, pragma[only_bind_into](apa),
       pragma[only_bind_into](config)) and
     callable = resolveCall(call, outercc) and
-    parameterCand(callable, pragma[only_bind_into](i), pragma[only_bind_into](apa),
+    parameterCand(callable, pragma[only_bind_into](pos), pragma[only_bind_into](apa),
       pragma[only_bind_into](config))
   )
 }
@@ -3666,9 +3687,9 @@ private predicate pathIntoCallable(
   PathNodeMid mid, ParamNodeEx p, CallContext outercc, CallContextCall innercc, SummaryCtx sc,
   DataFlowCall call, Configuration config
 ) {
-  exists(int i, DataFlowCallable callable, AccessPath ap |
-    pathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-    p.isParameterOf(callable, i) and
+  exists(ParameterPosition pos, DataFlowCallable callable, AccessPath ap |
+    pathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+    p.isParameterOf(callable, pos) and
     (
       sc = TSummaryCtxSome(p, ap)
       or
@@ -3692,7 +3713,7 @@ private predicate paramFlowsThrough(
   ReturnKindExt kind, CallContextCall cc, SummaryCtxSome sc, AccessPath ap, AccessPathApprox apa,
   Configuration config
 ) {
-  exists(PathNodeMid mid, RetNodeEx ret, int pos |
+  exists(PathNodeMid mid, RetNodeEx ret, ParameterPosition pos |
     mid.getNodeEx() = ret and
     kind = ret.getKind() and
     cc = mid.getCallContext() and
@@ -4421,24 +4442,25 @@ private module FlowExploration {
 
   pragma[noinline]
   private predicate partialPathIntoArg(
-    PartialPathNodeFwd mid, int i, CallContext cc, DataFlowCall call, PartialAccessPath ap,
-    Configuration config
+    PartialPathNodeFwd mid, ParameterPosition ppos, CallContext cc, DataFlowCall call,
+    PartialAccessPath ap, Configuration config
   ) {
-    exists(ArgNode arg |
+    exists(ArgNode arg, ArgumentPosition apos |
       arg = mid.getNodeEx().asNode() and
       cc = mid.getCallContext() and
-      arg.argumentOf(call, i) and
+      arg.argumentOf(call, apos) and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate partialPathIntoCallable0(
-    PartialPathNodeFwd mid, DataFlowCallable callable, int i, CallContext outercc,
+    PartialPathNodeFwd mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
     DataFlowCall call, PartialAccessPath ap, Configuration config
   ) {
-    partialPathIntoArg(mid, i, outercc, call, ap, config) and
+    partialPathIntoArg(mid, pos, outercc, call, ap, config) and
     callable = resolveCall(call, outercc)
   }
 
@@ -4447,9 +4469,9 @@ private module FlowExploration {
     TSummaryCtx1 sc1, TSummaryCtx2 sc2, DataFlowCall call, PartialAccessPath ap,
     Configuration config
   ) {
-    exists(int i, DataFlowCallable callable |
-      partialPathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-      p.isParameterOf(callable, i) and
+    exists(ParameterPosition pos, DataFlowCallable callable |
+      partialPathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+      p.isParameterOf(callable, pos) and
       sc1 = TSummaryCtx1Param(p) and
       sc2 = TSummaryCtx2Some(ap)
     |
@@ -4613,22 +4635,23 @@ private module FlowExploration {
 
   pragma[nomagic]
   private predicate revPartialPathFlowsThrough(
-    int pos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2, RevPartialAccessPath ap,
-    Configuration config
+    ArgumentPosition apos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2,
+    RevPartialAccessPath ap, Configuration config
   ) {
-    exists(PartialPathNodeRev mid, ParamNodeEx p |
+    exists(PartialPathNodeRev mid, ParamNodeEx p, ParameterPosition ppos |
       mid.getNodeEx() = p and
-      p.getPosition() = pos and
+      p.getPosition() = ppos and
       sc1 = mid.getSummaryCtx1() and
       sc2 = mid.getSummaryCtx2() and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate revPartialPathThroughCallable0(
-    DataFlowCall call, PartialPathNodeRev mid, int pos, RevPartialAccessPath ap,
+    DataFlowCall call, PartialPathNodeRev mid, ArgumentPosition pos, RevPartialAccessPath ap,
     Configuration config
   ) {
     exists(TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2 |
@@ -4641,7 +4664,7 @@ private module FlowExploration {
   private predicate revPartialPathThroughCallable(
     PartialPathNodeRev mid, ArgNodeEx node, RevPartialAccessPath ap, Configuration config
   ) {
-    exists(DataFlowCall call, int pos |
+    exists(DataFlowCall call, ArgumentPosition pos |
       revPartialPathThroughCallable0(call, mid, pos, ap, config) and
       node.asNode().(ArgNode).argumentOf(call, pos)
     )

cpp/ql/lib/semmle/code/cpp/dataflow/internal/DataFlowImplCommon.qll

@@ -62,6 +62,18 @@ predicate accessPathCostLimits(int apLimit, int tupleLimit) {
   tupleLimit = 1000
 }
 
+/**
+ * Holds if `arg` is an argument of `call` with an argument position that matches
+ * parameter position `ppos`.
+ */
+pragma[noinline]
+predicate argumentPositionMatch(DataFlowCall call, ArgNode arg, ParameterPosition ppos) {
+  exists(ArgumentPosition apos |
+    arg.argumentOf(call, apos) and
+    parameterMatch(ppos, apos)
+  )
+}
+
 /**
  * Provides a simple data-flow analysis for resolving lambda calls. The analysis
  * currently excludes read-steps, store-steps, and flow-through.
@@ -71,25 +83,27 @@ predicate accessPathCostLimits(int apLimit, int tupleLimit) {
  * calls. For this reason, we cannot reuse the code from `DataFlowImpl.qll` directly.
  */
 private module LambdaFlow {
-  private predicate viableParamNonLambda(DataFlowCall call, int i, ParamNode p) {
-    p.isParameterOf(viableCallable(call), i)
+  pragma[noinline]
+  private predicate viableParamNonLambda(DataFlowCall call, ParameterPosition ppos, ParamNode p) {
+    p.isParameterOf(viableCallable(call), ppos)
   }
 
-  private predicate viableParamLambda(DataFlowCall call, int i, ParamNode p) {
-    p.isParameterOf(viableCallableLambda(call, _), i)
+  pragma[noinline]
+  private predicate viableParamLambda(DataFlowCall call, ParameterPosition ppos, ParamNode p) {
+    p.isParameterOf(viableCallableLambda(call, _), ppos)
   }
 
   private predicate viableParamArgNonLambda(DataFlowCall call, ParamNode p, ArgNode arg) {
-    exists(int i |
-      viableParamNonLambda(call, i, p) and
-      arg.argumentOf(call, i)
+    exists(ParameterPosition ppos |
+      viableParamNonLambda(call, ppos, p) and
+      argumentPositionMatch(call, arg, ppos)
     )
   }
 
   private predicate viableParamArgLambda(DataFlowCall call, ParamNode p, ArgNode arg) {
-    exists(int i |
-      viableParamLambda(call, i, p) and
-      arg.argumentOf(call, i)
+    exists(ParameterPosition ppos |
+      viableParamLambda(call, ppos, p) and
+      argumentPositionMatch(call, arg, ppos)
     )
   }
 
@@ -322,7 +336,7 @@ private module Cached {
     or
     exists(ArgNode arg |
       result.(PostUpdateNode).getPreUpdateNode() = arg and
-      arg.argumentOf(call, k.(ParamUpdateReturnKind).getPosition())
+      arg.argumentOf(call, k.(ParamUpdateReturnKind).getAMatchingArgumentPosition())
     )
   }
 
@@ -330,7 +344,7 @@ private module Cached {
   predicate returnNodeExt(Node n, ReturnKindExt k) {
     k = TValueReturn(n.(ReturnNode).getKind())
     or
-    exists(ParamNode p, int pos |
+    exists(ParamNode p, ParameterPosition pos |
       parameterValueFlowsToPreUpdate(p, n) and
       p.isParameterOf(_, pos) and
       k = TParamUpdate(pos)
@@ -352,11 +366,13 @@ private module Cached {
   }
 
   cached
-  predicate parameterNode(Node p, DataFlowCallable c, int pos) { isParameterNode(p, c, pos) }
+  predicate parameterNode(Node p, DataFlowCallable c, ParameterPosition pos) {
+    isParameterNode(p, c, pos)
+  }
 
   cached
-  predicate argumentNode(Node n, DataFlowCall call, int pos) {
-    n.(ArgumentNode).argumentOf(call, pos)
+  predicate argumentNode(Node n, DataFlowCall call, ArgumentPosition pos) {
+    isArgumentNode(n, call, pos)
   }
 
   /**
@@ -374,12 +390,12 @@ private module Cached {
   }
 
   /**
-   * Holds if `p` is the `i`th parameter of a viable dispatch target of `call`.
-   * The instance parameter is considered to have index `-1`.
+   * Holds if `p` is the parameter of a viable dispatch target of `call`,
+   * and `p` has position `ppos`.
    */
   pragma[nomagic]
-  private predicate viableParam(DataFlowCall call, int i, ParamNode p) {
-    p.isParameterOf(viableCallableExt(call), i)
+  private predicate viableParam(DataFlowCall call, ParameterPosition ppos, ParamNode p) {
+    p.isParameterOf(viableCallableExt(call), ppos)
   }
 
   /**
@@ -388,9 +404,9 @@ private module Cached {
    */
   cached
   predicate viableParamArg(DataFlowCall call, ParamNode p, ArgNode arg) {
-    exists(int i |
-      viableParam(call, i, p) and
-      arg.argumentOf(call, i) and
+    exists(ParameterPosition ppos |
+      viableParam(call, ppos, p) and
+      argumentPositionMatch(call, arg, ppos) and
       compatibleTypes(getNodeDataFlowType(arg), getNodeDataFlowType(p))
     )
   }
@@ -862,7 +878,7 @@ private module Cached {
   cached
   newtype TReturnKindExt =
     TValueReturn(ReturnKind kind) or
-    TParamUpdate(int pos) { exists(ParamNode p | p.isParameterOf(_, pos)) }
+    TParamUpdate(ParameterPosition pos) { exists(ParamNode p | p.isParameterOf(_, pos)) }
 
   cached
   newtype TBooleanOption =
@@ -1054,9 +1070,9 @@ class ParamNode extends Node {
 
   /**
    * Holds if this node is the parameter of callable `c` at the specified
-   * (zero-based) position.
+   * position.
    */
-  predicate isParameterOf(DataFlowCallable c, int i) { parameterNode(this, c, i) }
+  predicate isParameterOf(DataFlowCallable c, ParameterPosition pos) { parameterNode(this, c, pos) }
 }
 
 /** A data-flow node that represents a call argument. */
@@ -1064,7 +1080,9 @@ class ArgNode extends Node {
   ArgNode() { argumentNode(this, _, _) }
 
   /** Holds if this argument occurs at the given position in the given call. */
-  final predicate argumentOf(DataFlowCall call, int pos) { argumentNode(this, call, pos) }
+  final predicate argumentOf(DataFlowCall call, ArgumentPosition pos) {
+    argumentNode(this, call, pos)
+  }
 }
 
 /**
@@ -1110,11 +1128,14 @@ class ValueReturnKind extends ReturnKindExt, TValueReturn {
 }
 
 class ParamUpdateReturnKind extends ReturnKindExt, TParamUpdate {
-  private int pos;
+  private ParameterPosition pos;
 
   ParamUpdateReturnKind() { this = TParamUpdate(pos) }
 
-  int getPosition() { result = pos }
+  ParameterPosition getPosition() { result = pos }
+
+  pragma[nomagic]
+  ArgumentPosition getAMatchingArgumentPosition() { parameterMatch(pos, result) }
 
   override string toString() { result = "param update " + pos }
 }

cpp/ql/lib/semmle/code/cpp/dataflow/internal/DataFlowImplConsistency.qll

@@ -9,6 +9,19 @@ private import tainttracking1.TaintTrackingParameter::Private
 private import tainttracking1.TaintTrackingParameter::Public
 
 module Consistency {
+  private newtype TConsistencyConfiguration = MkConsistencyConfiguration()
+
+  /** A class for configuring the consistency queries. */
+  class ConsistencyConfiguration extends TConsistencyConfiguration {
+    string toString() { none() }
+
+    /** Holds if `n` should be excluded from the consistency test `postWithInFlow`. */
+    predicate postWithInFlowExclude(Node n) { none() }
+
+    /** Holds if `n` should be excluded from the consistency test `argHasPostUpdate`. */
+    predicate argHasPostUpdateExclude(ArgumentNode n) { none() }
+  }
+
   private class RelevantNode extends Node {
     RelevantNode() {
       this instanceof ArgumentNode or
@@ -164,7 +177,7 @@ module Consistency {
 
   query predicate argHasPostUpdate(ArgumentNode n, string msg) {
     not hasPost(n) and
-    not isImmutableOrUnobservable(n) and
+    not any(ConsistencyConfiguration c).argHasPostUpdateExclude(n) and
     msg = "ArgumentNode is missing PostUpdateNode."
   }
 
@@ -177,6 +190,7 @@ module Consistency {
     isPostUpdateNode(n) and
     not clearsContent(n, _) and
     simpleLocalFlowStep(_, n) and
+    not any(ConsistencyConfiguration c).postWithInFlowExclude(n) and
     msg = "PostUpdateNode should not be the target of local flow."
   }
 }

cpp/ql/lib/semmle/code/cpp/dataflow/internal/DataFlowImplLocal.qll

@@ -256,11 +256,11 @@ private class ArgNodeEx extends NodeEx {
 private class ParamNodeEx extends NodeEx {
   ParamNodeEx() { this.asNode() instanceof ParamNode }
 
-  predicate isParameterOf(DataFlowCallable c, int i) {
-    this.asNode().(ParamNode).isParameterOf(c, i)
+  predicate isParameterOf(DataFlowCallable c, ParameterPosition pos) {
+    this.asNode().(ParamNode).isParameterOf(c, pos)
   }
 
-  int getPosition() { this.isParameterOf(_, result) }
+  ParameterPosition getPosition() { this.isParameterOf(_, result) }
 
   predicate allowParameterReturnInSelf() { allowParameterReturnInSelfCached(this.asNode()) }
 }
@@ -289,6 +289,7 @@ private predicate outBarrier(NodeEx node, Configuration config) {
   )
 }
 
+pragma[nomagic]
 private predicate fullBarrier(NodeEx node, Configuration config) {
   exists(Node n | node.asNode() = n |
     config.isBarrier(n)
@@ -307,11 +308,23 @@ private predicate fullBarrier(NodeEx node, Configuration config) {
 }
 
 pragma[nomagic]
-private predicate sourceNode(NodeEx node, Configuration config) { config.isSource(node.asNode()) }
+private predicate sourceNode(NodeEx node, Configuration config) {
+  config.isSource(node.asNode()) and
+  not fullBarrier(node, config)
+}
 
 pragma[nomagic]
 private predicate sinkNode(NodeEx node, Configuration config) { config.isSink(node.asNode()) }
 
+/** Provides the relevant barriers for a step from `node1` to `node2`. */
+pragma[inline]
+private predicate stepFilter(NodeEx node1, NodeEx node2, Configuration config) {
+  not outBarrier(node1, config) and
+  not inBarrier(node2, config) and
+  not fullBarrier(node1, config) and
+  not fullBarrier(node2, config)
+}
+
 /**
  * Holds if data can flow in one local step from `node1` to `node2`.
  */
@@ -320,16 +333,14 @@ private predicate localFlowStep(NodeEx node1, NodeEx node2, Configuration config
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     simpleLocalFlowStepExt(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.asNode() = n and
-    node2.isImplicitReadNode(n, false)
+    node2.isImplicitReadNode(n, false) and
+    not fullBarrier(node1, config)
   )
 }
 
@@ -342,16 +353,14 @@ private predicate additionalLocalFlowStep(NodeEx node1, NodeEx node2, Configurat
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) = getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.isImplicitReadNode(n, true) and
-    node2.asNode() = n
+    node2.asNode() = n and
+    not fullBarrier(node2, config)
   )
 }
 
@@ -363,10 +372,7 @@ private predicate jumpStep(NodeEx node1, NodeEx node2, Configuration config) {
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     jumpStepCached(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
@@ -380,16 +386,14 @@ private predicate additionalJumpStep(NodeEx node1, NodeEx node2, Configuration c
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) != getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
 
 private predicate read(NodeEx node1, Content c, NodeEx node2, Configuration config) {
-  read(node1.asNode(), c, node2.asNode())
+  read(node1.asNode(), c, node2.asNode()) and
+  stepFilter(node1, node2, config)
   or
   exists(Node n |
     node2.isImplicitReadNode(n, true) and
@@ -402,7 +406,8 @@ private predicate store(
   NodeEx node1, TypedContent tc, NodeEx node2, DataFlowType contentType, Configuration config
 ) {
   store(node1.asNode(), tc, node2.asNode(), contentType) and
-  read(_, tc.getContent(), _, config)
+  read(_, tc.getContent(), _, config) and
+  stepFilter(node1, node2, config)
 }
 
 pragma[nomagic]
@@ -451,63 +456,59 @@ private module Stage1 {
    * argument in a call.
    */
   predicate fwdFlow(NodeEx node, Cc cc, Configuration config) {
-    not fullBarrier(node, config) and
-    (
-      sourceNode(node, config) and
-      if hasSourceCallCtx(config) then cc = true else cc = false
+    sourceNode(node, config) and
+    if hasSourceCallCtx(config) then cc = true else cc = false
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      localFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      additionalLocalFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      jumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      additionalJumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    // store
+    exists(NodeEx mid |
+      useFieldFlow(config) and
+      fwdFlow(mid, cc, config) and
+      store(mid, _, node, _, config)
+    )
+    or
+    // read
+    exists(Content c |
+      fwdFlowRead(c, node, cc, config) and
+      fwdFlowConsCand(c, config)
+    )
+    or
+    // flow into a callable
+    exists(NodeEx arg |
+      fwdFlow(arg, _, config) and
+      viableParamArgEx(_, node, arg) and
+      cc = true and
+      not fullBarrier(node, config)
+    )
+    or
+    // flow out of a callable
+    exists(DataFlowCall call |
+      fwdFlowOut(call, node, false, config) and
+      cc = false
       or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        localFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        additionalLocalFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        jumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        additionalJumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      // store
-      exists(NodeEx mid |
-        useFieldFlow(config) and
-        fwdFlow(mid, cc, config) and
-        store(mid, _, node, _, config) and
-        not outBarrier(mid, config)
-      )
-      or
-      // read
-      exists(Content c |
-        fwdFlowRead(c, node, cc, config) and
-        fwdFlowConsCand(c, config) and
-        not inBarrier(node, config)
-      )
-      or
-      // flow into a callable
-      exists(NodeEx arg |
-        fwdFlow(arg, _, config) and
-        viableParamArgEx(_, node, arg) and
-        cc = true
-      )
-      or
-      // flow out of a callable
-      exists(DataFlowCall call |
-        fwdFlowOut(call, node, false, config) and
-        cc = false
-        or
-        fwdFlowOutFromArg(call, node, config) and
-        fwdFlowIsEntered(call, cc, config)
-      )
+      fwdFlowOutFromArg(call, node, config) and
+      fwdFlowIsEntered(call, cc, config)
     )
   }
 
@@ -547,7 +548,8 @@ private module Stage1 {
   private predicate fwdFlowOut(DataFlowCall call, NodeEx out, Cc cc, Configuration config) {
     exists(ReturnPosition pos |
       fwdFlowReturnPosition(pos, cc, config) and
-      viableReturnPosOutEx(call, pos, out)
+      viableReturnPosOutEx(call, pos, out) and
+      not fullBarrier(out, config)
     )
   }
 
@@ -773,6 +775,7 @@ private module Stage1 {
    * Holds if flow may enter through `p` and reach a return node making `p` a
    * candidate for the origin of a summary.
    */
+  pragma[nomagic]
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
     exists(ReturnKindExt kind |
       throughFlowNodeCand(p, config) and
@@ -1009,6 +1012,9 @@ private module Stage2 {
 
   private predicate flowIntoCall = flowIntoCallNodeCand1/5;
 
+  bindingset[node, ap]
+  private predicate filter(NodeEx node, Ap ap) { any() }
+
   bindingset[ap, contentType]
   private predicate typecheckStore(Ap ap, DataFlowType contentType) { any() }
 
@@ -1017,14 +1023,23 @@ private module Stage2 {
     PrevStage::revFlow(node, _, _, apa, config)
   }
 
+  bindingset[result, apa]
+  private ApApprox unbindApa(ApApprox apa) {
+    exists(ApApprox apa0 |
+      apa = pragma[only_bind_into](apa0) and result = pragma[only_bind_into](apa0)
+    )
+  }
+
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1037,6 +1052,13 @@ private module Stage2 {
    */
   pragma[nomagic]
   predicate fwdFlow(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
+    fwdFlow0(node, cc, argAp, ap, config) and
+    flowCand(node, unbindApa(getApprox(ap)), config) and
+    filter(node, ap)
+  }
+
+  pragma[nomagic]
+  private predicate fwdFlow0(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
     flowCand(node, _, config) and
     sourceNode(node, config) and
     (if hasSourceCallCtx(config) then cc = ccSomeCall() else cc = ccNone()) and
@@ -1107,7 +1129,7 @@ private module Stage2 {
   ) {
     exists(DataFlowType contentType |
       fwdFlow(node1, cc, argAp, ap1, config) and
-      PrevStage::storeStepCand(node1, getApprox(ap1), tc, node2, contentType, config) and
+      PrevStage::storeStepCand(node1, unbindApa(getApprox(ap1)), tc, node2, contentType, config) and
       typecheckStore(ap1, contentType)
     )
   }
@@ -1142,9 +1164,8 @@ private module Stage2 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1159,9 +1180,8 @@ private module Stage2 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1171,10 +1191,8 @@ private module Stage2 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1188,7 +1206,7 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p |
       fwdFlowIn(call, p, cc, _, argAp, ap, config) and
-      PrevStage::parameterMayFlowThrough(p, _, getApprox(ap), config)
+      PrevStage::parameterMayFlowThrough(p, _, unbindApa(getApprox(ap)), config)
     )
   }
 
@@ -1230,6 +1248,11 @@ private module Stage2 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -1306,7 +1329,7 @@ private module Stage2 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -1341,9 +1364,8 @@ private module Stage2 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1353,9 +1375,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1365,9 +1386,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1427,7 +1447,7 @@ private module Stage2 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -1707,12 +1727,14 @@ private module Stage3 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1837,9 +1859,8 @@ private module Stage3 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1854,9 +1875,8 @@ private module Stage3 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1866,10 +1886,8 @@ private module Stage3 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1925,6 +1943,11 @@ private module Stage3 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2001,7 +2024,7 @@ private module Stage3 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2036,9 +2059,8 @@ private module Stage3 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2048,9 +2070,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2060,9 +2081,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2122,7 +2142,7 @@ private module Stage3 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2473,12 +2493,14 @@ private module Stage4 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -2603,9 +2625,8 @@ private module Stage4 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2620,9 +2641,8 @@ private module Stage4 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2632,10 +2652,8 @@ private module Stage4 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2691,6 +2709,11 @@ private module Stage4 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2767,7 +2790,7 @@ private module Stage4 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2802,9 +2825,8 @@ private module Stage4 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2814,9 +2836,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2826,9 +2847,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2888,7 +2908,7 @@ private module Stage4 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2972,7 +2992,7 @@ private class SummaryCtxSome extends SummaryCtx, TSummaryCtxSome {
 
   SummaryCtxSome() { this = TSummaryCtxSome(p, ap) }
 
-  int getParameterPos() { p.isParameterOf(_, result) }
+  ParameterPosition getParameterPos() { p.isParameterOf(_, result) }
 
   ParamNodeEx getParamNode() { result = p }
 
@@ -3619,39 +3639,40 @@ private predicate pathOutOfCallable(PathNodeMid mid, NodeEx out, CallContext cc)
  */
 pragma[noinline]
 private predicate pathIntoArg(
-  PathNodeMid mid, int i, CallContext cc, DataFlowCall call, AccessPath ap, AccessPathApprox apa,
-  Configuration config
+  PathNodeMid mid, ParameterPosition ppos, CallContext cc, DataFlowCall call, AccessPath ap,
+  AccessPathApprox apa, Configuration config
 ) {
-  exists(ArgNode arg |
+  exists(ArgNode arg, ArgumentPosition apos |
     arg = mid.getNodeEx().asNode() and
     cc = mid.getCallContext() and
-    arg.argumentOf(call, i) and
+    arg.argumentOf(call, apos) and
     ap = mid.getAp() and
     apa = ap.getApprox() and
-    config = mid.getConfiguration()
+    config = mid.getConfiguration() and
+    parameterMatch(ppos, apos)
   )
 }
 
 pragma[nomagic]
 private predicate parameterCand(
-  DataFlowCallable callable, int i, AccessPathApprox apa, Configuration config
+  DataFlowCallable callable, ParameterPosition pos, AccessPathApprox apa, Configuration config
 ) {
   exists(ParamNodeEx p |
     Stage4::revFlow(p, _, _, apa, config) and
-    p.isParameterOf(callable, i)
+    p.isParameterOf(callable, pos)
   )
 }
 
 pragma[nomagic]
 private predicate pathIntoCallable0(
-  PathNodeMid mid, DataFlowCallable callable, int i, CallContext outercc, DataFlowCall call,
-  AccessPath ap, Configuration config
+  PathNodeMid mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
+  DataFlowCall call, AccessPath ap, Configuration config
 ) {
   exists(AccessPathApprox apa |
-    pathIntoArg(mid, pragma[only_bind_into](i), outercc, call, ap, pragma[only_bind_into](apa),
+    pathIntoArg(mid, pragma[only_bind_into](pos), outercc, call, ap, pragma[only_bind_into](apa),
       pragma[only_bind_into](config)) and
     callable = resolveCall(call, outercc) and
-    parameterCand(callable, pragma[only_bind_into](i), pragma[only_bind_into](apa),
+    parameterCand(callable, pragma[only_bind_into](pos), pragma[only_bind_into](apa),
       pragma[only_bind_into](config))
   )
 }
@@ -3666,9 +3687,9 @@ private predicate pathIntoCallable(
   PathNodeMid mid, ParamNodeEx p, CallContext outercc, CallContextCall innercc, SummaryCtx sc,
   DataFlowCall call, Configuration config
 ) {
-  exists(int i, DataFlowCallable callable, AccessPath ap |
-    pathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-    p.isParameterOf(callable, i) and
+  exists(ParameterPosition pos, DataFlowCallable callable, AccessPath ap |
+    pathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+    p.isParameterOf(callable, pos) and
     (
       sc = TSummaryCtxSome(p, ap)
       or
@@ -3692,7 +3713,7 @@ private predicate paramFlowsThrough(
   ReturnKindExt kind, CallContextCall cc, SummaryCtxSome sc, AccessPath ap, AccessPathApprox apa,
   Configuration config
 ) {
-  exists(PathNodeMid mid, RetNodeEx ret, int pos |
+  exists(PathNodeMid mid, RetNodeEx ret, ParameterPosition pos |
     mid.getNodeEx() = ret and
     kind = ret.getKind() and
     cc = mid.getCallContext() and
@@ -4421,24 +4442,25 @@ private module FlowExploration {
 
   pragma[noinline]
   private predicate partialPathIntoArg(
-    PartialPathNodeFwd mid, int i, CallContext cc, DataFlowCall call, PartialAccessPath ap,
-    Configuration config
+    PartialPathNodeFwd mid, ParameterPosition ppos, CallContext cc, DataFlowCall call,
+    PartialAccessPath ap, Configuration config
   ) {
-    exists(ArgNode arg |
+    exists(ArgNode arg, ArgumentPosition apos |
       arg = mid.getNodeEx().asNode() and
       cc = mid.getCallContext() and
-      arg.argumentOf(call, i) and
+      arg.argumentOf(call, apos) and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate partialPathIntoCallable0(
-    PartialPathNodeFwd mid, DataFlowCallable callable, int i, CallContext outercc,
+    PartialPathNodeFwd mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
     DataFlowCall call, PartialAccessPath ap, Configuration config
   ) {
-    partialPathIntoArg(mid, i, outercc, call, ap, config) and
+    partialPathIntoArg(mid, pos, outercc, call, ap, config) and
     callable = resolveCall(call, outercc)
   }
 
@@ -4447,9 +4469,9 @@ private module FlowExploration {
     TSummaryCtx1 sc1, TSummaryCtx2 sc2, DataFlowCall call, PartialAccessPath ap,
     Configuration config
   ) {
-    exists(int i, DataFlowCallable callable |
-      partialPathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-      p.isParameterOf(callable, i) and
+    exists(ParameterPosition pos, DataFlowCallable callable |
+      partialPathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+      p.isParameterOf(callable, pos) and
       sc1 = TSummaryCtx1Param(p) and
       sc2 = TSummaryCtx2Some(ap)
     |
@@ -4613,22 +4635,23 @@ private module FlowExploration {
 
   pragma[nomagic]
   private predicate revPartialPathFlowsThrough(
-    int pos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2, RevPartialAccessPath ap,
-    Configuration config
+    ArgumentPosition apos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2,
+    RevPartialAccessPath ap, Configuration config
   ) {
-    exists(PartialPathNodeRev mid, ParamNodeEx p |
+    exists(PartialPathNodeRev mid, ParamNodeEx p, ParameterPosition ppos |
       mid.getNodeEx() = p and
-      p.getPosition() = pos and
+      p.getPosition() = ppos and
       sc1 = mid.getSummaryCtx1() and
       sc2 = mid.getSummaryCtx2() and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate revPartialPathThroughCallable0(
-    DataFlowCall call, PartialPathNodeRev mid, int pos, RevPartialAccessPath ap,
+    DataFlowCall call, PartialPathNodeRev mid, ArgumentPosition pos, RevPartialAccessPath ap,
     Configuration config
   ) {
     exists(TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2 |
@@ -4641,7 +4664,7 @@ private module FlowExploration {
   private predicate revPartialPathThroughCallable(
     PartialPathNodeRev mid, ArgNodeEx node, RevPartialAccessPath ap, Configuration config
   ) {
-    exists(DataFlowCall call, int pos |
+    exists(DataFlowCall call, ArgumentPosition pos |
       revPartialPathThroughCallable0(call, mid, pos, ap, config) and
       node.asNode().(ArgNode).argumentOf(call, pos)
     )

cpp/ql/lib/semmle/code/cpp/dataflow/internal/DataFlowPrivate.qll

@@ -2,12 +2,20 @@ private import cpp
 private import DataFlowUtil
 private import DataFlowDispatch
 private import FlowVar
+private import DataFlowImplConsistency
 
 /** Gets the callable in which this node occurs. */
 DataFlowCallable nodeGetEnclosingCallable(Node n) { result = n.getEnclosingCallable() }
 
 /** Holds if `p` is a `ParameterNode` of `c` with position `pos`. */
-predicate isParameterNode(ParameterNode p, DataFlowCallable c, int pos) { p.isParameterOf(c, pos) }
+predicate isParameterNode(ParameterNode p, DataFlowCallable c, ParameterPosition pos) {
+  p.isParameterOf(c, pos)
+}
+
+/** Holds if `arg` is an `ArgumentNode` of `c` with position `pos`. */
+predicate isArgumentNode(ArgumentNode arg, DataFlowCall c, ArgumentPosition pos) {
+  arg.argumentOf(c, pos)
+}
 
 /** Gets the instance argument of a non-static call. */
 private Node getInstanceArgument(Call call) {
@@ -259,27 +267,6 @@ class Unit extends TUnit {
   string toString() { result = "unit" }
 }
 
-/**
- * Holds if `n` does not require a `PostUpdateNode` as it either cannot be
- * modified or its modification cannot be observed, for example if it is a
- * freshly created object that is not saved in a variable.
- *
- * This predicate is only used for consistency checks.
- */
-predicate isImmutableOrUnobservable(Node n) {
-  // Is the null pointer (or something that's not really a pointer)
-  exists(n.asExpr().getValue())
-  or
-  // Isn't a pointer or is a pointer to const
-  forall(DerivedType dt | dt = n.asExpr().getActualType() |
-    dt.getBaseType().isConst()
-    or
-    dt.getBaseType() instanceof RoutineType
-  )
-  // The above list of cases isn't exhaustive, but it narrows down the
-  // consistency alerts enough that most of them are interesting.
-}
-
 /** Holds if `n` should be hidden from path explanations. */
 predicate nodeIsHidden(Node n) { none() }
 
@@ -302,3 +289,19 @@ predicate additionalLambdaFlowStep(Node nodeFrom, Node nodeTo, boolean preserves
  * by default as a heuristic.
  */
 predicate allowParameterReturnInSelf(ParameterNode p) { none() }
+
+private class MyConsistencyConfiguration extends Consistency::ConsistencyConfiguration {
+  override predicate argHasPostUpdateExclude(ArgumentNode n) {
+    // Is the null pointer (or something that's not really a pointer)
+    exists(n.asExpr().getValue())
+    or
+    // Isn't a pointer or is a pointer to const
+    forall(DerivedType dt | dt = n.asExpr().getActualType() |
+      dt.getBaseType().isConst()
+      or
+      dt.getBaseType() instanceof RoutineType
+    )
+    // The above list of cases isn't exhaustive, but it narrows down the
+    // consistency alerts enough that most of them are interesting.
+  }
+}

cpp/ql/lib/semmle/code/cpp/ir/dataflow/DefaultTaintTracking.qll

@@ -484,8 +484,9 @@ module TaintedWithPath {
     /** Gets the element that `pathNode` wraps, if any. */
     Element getElementFromPathNode(PathNode pathNode) {
       exists(DataFlow::Node node | node = pathNode.(WrapPathNode).inner().getNode() |
-        result = node.asExpr() or
-        result = node.asParameter()
+        result = node.asInstruction().getAST()
+        or
+        result = node.asOperand().getDef().getAST()
       )
       or
       result = pathNode.(EndpointPathNode).inner()

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowDispatch.qll

@@ -2,6 +2,7 @@ private import cpp
 private import semmle.code.cpp.ir.IR
 private import semmle.code.cpp.ir.dataflow.DataFlow
 private import semmle.code.cpp.ir.dataflow.internal.DataFlowPrivate
+private import semmle.code.cpp.ir.dataflow.internal.DataFlowUtil
 private import DataFlowImplCommon as DataFlowImplCommon
 
 /**
@@ -266,3 +267,17 @@ Function viableImplInCallContext(CallInstruction call, CallInstruction ctx) {
     result = ctx.getArgument(i).getUnconvertedResultExpression().(FunctionAccess).getTarget()
   )
 }
+
+/** A parameter position represented by an integer. */
+class ParameterPosition extends int {
+  ParameterPosition() { any(ParameterNode p).isParameterOf(_, this) }
+}
+
+/** An argument position represented by an integer. */
+class ArgumentPosition extends int {
+  ArgumentPosition() { any(ArgumentNode a).argumentOf(_, this) }
+}
+
+/** Holds if arguments at position `apos` match parameters at position `ppos`. */
+pragma[inline]
+predicate parameterMatch(ParameterPosition ppos, ArgumentPosition apos) { ppos = apos }

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowImpl.qll

@@ -256,11 +256,11 @@ private class ArgNodeEx extends NodeEx {
 private class ParamNodeEx extends NodeEx {
   ParamNodeEx() { this.asNode() instanceof ParamNode }
 
-  predicate isParameterOf(DataFlowCallable c, int i) {
-    this.asNode().(ParamNode).isParameterOf(c, i)
+  predicate isParameterOf(DataFlowCallable c, ParameterPosition pos) {
+    this.asNode().(ParamNode).isParameterOf(c, pos)
   }
 
-  int getPosition() { this.isParameterOf(_, result) }
+  ParameterPosition getPosition() { this.isParameterOf(_, result) }
 
   predicate allowParameterReturnInSelf() { allowParameterReturnInSelfCached(this.asNode()) }
 }
@@ -289,6 +289,7 @@ private predicate outBarrier(NodeEx node, Configuration config) {
   )
 }
 
+pragma[nomagic]
 private predicate fullBarrier(NodeEx node, Configuration config) {
   exists(Node n | node.asNode() = n |
     config.isBarrier(n)
@@ -307,11 +308,23 @@ private predicate fullBarrier(NodeEx node, Configuration config) {
 }
 
 pragma[nomagic]
-private predicate sourceNode(NodeEx node, Configuration config) { config.isSource(node.asNode()) }
+private predicate sourceNode(NodeEx node, Configuration config) {
+  config.isSource(node.asNode()) and
+  not fullBarrier(node, config)
+}
 
 pragma[nomagic]
 private predicate sinkNode(NodeEx node, Configuration config) { config.isSink(node.asNode()) }
 
+/** Provides the relevant barriers for a step from `node1` to `node2`. */
+pragma[inline]
+private predicate stepFilter(NodeEx node1, NodeEx node2, Configuration config) {
+  not outBarrier(node1, config) and
+  not inBarrier(node2, config) and
+  not fullBarrier(node1, config) and
+  not fullBarrier(node2, config)
+}
+
 /**
  * Holds if data can flow in one local step from `node1` to `node2`.
  */
@@ -320,16 +333,14 @@ private predicate localFlowStep(NodeEx node1, NodeEx node2, Configuration config
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     simpleLocalFlowStepExt(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.asNode() = n and
-    node2.isImplicitReadNode(n, false)
+    node2.isImplicitReadNode(n, false) and
+    not fullBarrier(node1, config)
   )
 }
 
@@ -342,16 +353,14 @@ private predicate additionalLocalFlowStep(NodeEx node1, NodeEx node2, Configurat
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) = getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.isImplicitReadNode(n, true) and
-    node2.asNode() = n
+    node2.asNode() = n and
+    not fullBarrier(node2, config)
   )
 }
 
@@ -363,10 +372,7 @@ private predicate jumpStep(NodeEx node1, NodeEx node2, Configuration config) {
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     jumpStepCached(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
@@ -380,16 +386,14 @@ private predicate additionalJumpStep(NodeEx node1, NodeEx node2, Configuration c
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) != getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
 
 private predicate read(NodeEx node1, Content c, NodeEx node2, Configuration config) {
-  read(node1.asNode(), c, node2.asNode())
+  read(node1.asNode(), c, node2.asNode()) and
+  stepFilter(node1, node2, config)
   or
   exists(Node n |
     node2.isImplicitReadNode(n, true) and
@@ -402,7 +406,8 @@ private predicate store(
   NodeEx node1, TypedContent tc, NodeEx node2, DataFlowType contentType, Configuration config
 ) {
   store(node1.asNode(), tc, node2.asNode(), contentType) and
-  read(_, tc.getContent(), _, config)
+  read(_, tc.getContent(), _, config) and
+  stepFilter(node1, node2, config)
 }
 
 pragma[nomagic]
@@ -451,63 +456,59 @@ private module Stage1 {
    * argument in a call.
    */
   predicate fwdFlow(NodeEx node, Cc cc, Configuration config) {
-    not fullBarrier(node, config) and
-    (
-      sourceNode(node, config) and
-      if hasSourceCallCtx(config) then cc = true else cc = false
+    sourceNode(node, config) and
+    if hasSourceCallCtx(config) then cc = true else cc = false
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      localFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      additionalLocalFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      jumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      additionalJumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    // store
+    exists(NodeEx mid |
+      useFieldFlow(config) and
+      fwdFlow(mid, cc, config) and
+      store(mid, _, node, _, config)
+    )
+    or
+    // read
+    exists(Content c |
+      fwdFlowRead(c, node, cc, config) and
+      fwdFlowConsCand(c, config)
+    )
+    or
+    // flow into a callable
+    exists(NodeEx arg |
+      fwdFlow(arg, _, config) and
+      viableParamArgEx(_, node, arg) and
+      cc = true and
+      not fullBarrier(node, config)
+    )
+    or
+    // flow out of a callable
+    exists(DataFlowCall call |
+      fwdFlowOut(call, node, false, config) and
+      cc = false
       or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        localFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        additionalLocalFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        jumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        additionalJumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      // store
-      exists(NodeEx mid |
-        useFieldFlow(config) and
-        fwdFlow(mid, cc, config) and
-        store(mid, _, node, _, config) and
-        not outBarrier(mid, config)
-      )
-      or
-      // read
-      exists(Content c |
-        fwdFlowRead(c, node, cc, config) and
-        fwdFlowConsCand(c, config) and
-        not inBarrier(node, config)
-      )
-      or
-      // flow into a callable
-      exists(NodeEx arg |
-        fwdFlow(arg, _, config) and
-        viableParamArgEx(_, node, arg) and
-        cc = true
-      )
-      or
-      // flow out of a callable
-      exists(DataFlowCall call |
-        fwdFlowOut(call, node, false, config) and
-        cc = false
-        or
-        fwdFlowOutFromArg(call, node, config) and
-        fwdFlowIsEntered(call, cc, config)
-      )
+      fwdFlowOutFromArg(call, node, config) and
+      fwdFlowIsEntered(call, cc, config)
     )
   }
 
@@ -547,7 +548,8 @@ private module Stage1 {
   private predicate fwdFlowOut(DataFlowCall call, NodeEx out, Cc cc, Configuration config) {
     exists(ReturnPosition pos |
       fwdFlowReturnPosition(pos, cc, config) and
-      viableReturnPosOutEx(call, pos, out)
+      viableReturnPosOutEx(call, pos, out) and
+      not fullBarrier(out, config)
     )
   }
 
@@ -773,6 +775,7 @@ private module Stage1 {
    * Holds if flow may enter through `p` and reach a return node making `p` a
    * candidate for the origin of a summary.
    */
+  pragma[nomagic]
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
     exists(ReturnKindExt kind |
       throughFlowNodeCand(p, config) and
@@ -1009,6 +1012,9 @@ private module Stage2 {
 
   private predicate flowIntoCall = flowIntoCallNodeCand1/5;
 
+  bindingset[node, ap]
+  private predicate filter(NodeEx node, Ap ap) { any() }
+
   bindingset[ap, contentType]
   private predicate typecheckStore(Ap ap, DataFlowType contentType) { any() }
 
@@ -1017,14 +1023,23 @@ private module Stage2 {
     PrevStage::revFlow(node, _, _, apa, config)
   }
 
+  bindingset[result, apa]
+  private ApApprox unbindApa(ApApprox apa) {
+    exists(ApApprox apa0 |
+      apa = pragma[only_bind_into](apa0) and result = pragma[only_bind_into](apa0)
+    )
+  }
+
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1037,6 +1052,13 @@ private module Stage2 {
    */
   pragma[nomagic]
   predicate fwdFlow(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
+    fwdFlow0(node, cc, argAp, ap, config) and
+    flowCand(node, unbindApa(getApprox(ap)), config) and
+    filter(node, ap)
+  }
+
+  pragma[nomagic]
+  private predicate fwdFlow0(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
     flowCand(node, _, config) and
     sourceNode(node, config) and
     (if hasSourceCallCtx(config) then cc = ccSomeCall() else cc = ccNone()) and
@@ -1107,7 +1129,7 @@ private module Stage2 {
   ) {
     exists(DataFlowType contentType |
       fwdFlow(node1, cc, argAp, ap1, config) and
-      PrevStage::storeStepCand(node1, getApprox(ap1), tc, node2, contentType, config) and
+      PrevStage::storeStepCand(node1, unbindApa(getApprox(ap1)), tc, node2, contentType, config) and
       typecheckStore(ap1, contentType)
     )
   }
@@ -1142,9 +1164,8 @@ private module Stage2 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1159,9 +1180,8 @@ private module Stage2 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1171,10 +1191,8 @@ private module Stage2 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1188,7 +1206,7 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p |
       fwdFlowIn(call, p, cc, _, argAp, ap, config) and
-      PrevStage::parameterMayFlowThrough(p, _, getApprox(ap), config)
+      PrevStage::parameterMayFlowThrough(p, _, unbindApa(getApprox(ap)), config)
     )
   }
 
@@ -1230,6 +1248,11 @@ private module Stage2 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -1306,7 +1329,7 @@ private module Stage2 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -1341,9 +1364,8 @@ private module Stage2 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1353,9 +1375,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1365,9 +1386,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1427,7 +1447,7 @@ private module Stage2 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -1707,12 +1727,14 @@ private module Stage3 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1837,9 +1859,8 @@ private module Stage3 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1854,9 +1875,8 @@ private module Stage3 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1866,10 +1886,8 @@ private module Stage3 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1925,6 +1943,11 @@ private module Stage3 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2001,7 +2024,7 @@ private module Stage3 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2036,9 +2059,8 @@ private module Stage3 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2048,9 +2070,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2060,9 +2081,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2122,7 +2142,7 @@ private module Stage3 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2473,12 +2493,14 @@ private module Stage4 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -2603,9 +2625,8 @@ private module Stage4 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2620,9 +2641,8 @@ private module Stage4 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2632,10 +2652,8 @@ private module Stage4 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2691,6 +2709,11 @@ private module Stage4 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2767,7 +2790,7 @@ private module Stage4 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2802,9 +2825,8 @@ private module Stage4 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2814,9 +2836,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2826,9 +2847,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2888,7 +2908,7 @@ private module Stage4 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2972,7 +2992,7 @@ private class SummaryCtxSome extends SummaryCtx, TSummaryCtxSome {
 
   SummaryCtxSome() { this = TSummaryCtxSome(p, ap) }
 
-  int getParameterPos() { p.isParameterOf(_, result) }
+  ParameterPosition getParameterPos() { p.isParameterOf(_, result) }
 
   ParamNodeEx getParamNode() { result = p }
 
@@ -3619,39 +3639,40 @@ private predicate pathOutOfCallable(PathNodeMid mid, NodeEx out, CallContext cc)
  */
 pragma[noinline]
 private predicate pathIntoArg(
-  PathNodeMid mid, int i, CallContext cc, DataFlowCall call, AccessPath ap, AccessPathApprox apa,
-  Configuration config
+  PathNodeMid mid, ParameterPosition ppos, CallContext cc, DataFlowCall call, AccessPath ap,
+  AccessPathApprox apa, Configuration config
 ) {
-  exists(ArgNode arg |
+  exists(ArgNode arg, ArgumentPosition apos |
     arg = mid.getNodeEx().asNode() and
     cc = mid.getCallContext() and
-    arg.argumentOf(call, i) and
+    arg.argumentOf(call, apos) and
     ap = mid.getAp() and
     apa = ap.getApprox() and
-    config = mid.getConfiguration()
+    config = mid.getConfiguration() and
+    parameterMatch(ppos, apos)
   )
 }
 
 pragma[nomagic]
 private predicate parameterCand(
-  DataFlowCallable callable, int i, AccessPathApprox apa, Configuration config
+  DataFlowCallable callable, ParameterPosition pos, AccessPathApprox apa, Configuration config
 ) {
   exists(ParamNodeEx p |
     Stage4::revFlow(p, _, _, apa, config) and
-    p.isParameterOf(callable, i)
+    p.isParameterOf(callable, pos)
   )
 }
 
 pragma[nomagic]
 private predicate pathIntoCallable0(
-  PathNodeMid mid, DataFlowCallable callable, int i, CallContext outercc, DataFlowCall call,
-  AccessPath ap, Configuration config
+  PathNodeMid mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
+  DataFlowCall call, AccessPath ap, Configuration config
 ) {
   exists(AccessPathApprox apa |
-    pathIntoArg(mid, pragma[only_bind_into](i), outercc, call, ap, pragma[only_bind_into](apa),
+    pathIntoArg(mid, pragma[only_bind_into](pos), outercc, call, ap, pragma[only_bind_into](apa),
       pragma[only_bind_into](config)) and
     callable = resolveCall(call, outercc) and
-    parameterCand(callable, pragma[only_bind_into](i), pragma[only_bind_into](apa),
+    parameterCand(callable, pragma[only_bind_into](pos), pragma[only_bind_into](apa),
       pragma[only_bind_into](config))
   )
 }
@@ -3666,9 +3687,9 @@ private predicate pathIntoCallable(
   PathNodeMid mid, ParamNodeEx p, CallContext outercc, CallContextCall innercc, SummaryCtx sc,
   DataFlowCall call, Configuration config
 ) {
-  exists(int i, DataFlowCallable callable, AccessPath ap |
-    pathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-    p.isParameterOf(callable, i) and
+  exists(ParameterPosition pos, DataFlowCallable callable, AccessPath ap |
+    pathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+    p.isParameterOf(callable, pos) and
     (
       sc = TSummaryCtxSome(p, ap)
       or
@@ -3692,7 +3713,7 @@ private predicate paramFlowsThrough(
   ReturnKindExt kind, CallContextCall cc, SummaryCtxSome sc, AccessPath ap, AccessPathApprox apa,
   Configuration config
 ) {
-  exists(PathNodeMid mid, RetNodeEx ret, int pos |
+  exists(PathNodeMid mid, RetNodeEx ret, ParameterPosition pos |
     mid.getNodeEx() = ret and
     kind = ret.getKind() and
     cc = mid.getCallContext() and
@@ -4421,24 +4442,25 @@ private module FlowExploration {
 
   pragma[noinline]
   private predicate partialPathIntoArg(
-    PartialPathNodeFwd mid, int i, CallContext cc, DataFlowCall call, PartialAccessPath ap,
-    Configuration config
+    PartialPathNodeFwd mid, ParameterPosition ppos, CallContext cc, DataFlowCall call,
+    PartialAccessPath ap, Configuration config
   ) {
-    exists(ArgNode arg |
+    exists(ArgNode arg, ArgumentPosition apos |
       arg = mid.getNodeEx().asNode() and
       cc = mid.getCallContext() and
-      arg.argumentOf(call, i) and
+      arg.argumentOf(call, apos) and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate partialPathIntoCallable0(
-    PartialPathNodeFwd mid, DataFlowCallable callable, int i, CallContext outercc,
+    PartialPathNodeFwd mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
     DataFlowCall call, PartialAccessPath ap, Configuration config
   ) {
-    partialPathIntoArg(mid, i, outercc, call, ap, config) and
+    partialPathIntoArg(mid, pos, outercc, call, ap, config) and
     callable = resolveCall(call, outercc)
   }
 
@@ -4447,9 +4469,9 @@ private module FlowExploration {
     TSummaryCtx1 sc1, TSummaryCtx2 sc2, DataFlowCall call, PartialAccessPath ap,
     Configuration config
   ) {
-    exists(int i, DataFlowCallable callable |
-      partialPathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-      p.isParameterOf(callable, i) and
+    exists(ParameterPosition pos, DataFlowCallable callable |
+      partialPathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+      p.isParameterOf(callable, pos) and
       sc1 = TSummaryCtx1Param(p) and
       sc2 = TSummaryCtx2Some(ap)
     |
@@ -4613,22 +4635,23 @@ private module FlowExploration {
 
   pragma[nomagic]
   private predicate revPartialPathFlowsThrough(
-    int pos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2, RevPartialAccessPath ap,
-    Configuration config
+    ArgumentPosition apos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2,
+    RevPartialAccessPath ap, Configuration config
   ) {
-    exists(PartialPathNodeRev mid, ParamNodeEx p |
+    exists(PartialPathNodeRev mid, ParamNodeEx p, ParameterPosition ppos |
       mid.getNodeEx() = p and
-      p.getPosition() = pos and
+      p.getPosition() = ppos and
       sc1 = mid.getSummaryCtx1() and
       sc2 = mid.getSummaryCtx2() and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate revPartialPathThroughCallable0(
-    DataFlowCall call, PartialPathNodeRev mid, int pos, RevPartialAccessPath ap,
+    DataFlowCall call, PartialPathNodeRev mid, ArgumentPosition pos, RevPartialAccessPath ap,
     Configuration config
   ) {
     exists(TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2 |
@@ -4641,7 +4664,7 @@ private module FlowExploration {
   private predicate revPartialPathThroughCallable(
     PartialPathNodeRev mid, ArgNodeEx node, RevPartialAccessPath ap, Configuration config
   ) {
-    exists(DataFlowCall call, int pos |
+    exists(DataFlowCall call, ArgumentPosition pos |
       revPartialPathThroughCallable0(call, mid, pos, ap, config) and
       node.asNode().(ArgNode).argumentOf(call, pos)
     )

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowImpl2.qll

@@ -256,11 +256,11 @@ private class ArgNodeEx extends NodeEx {
 private class ParamNodeEx extends NodeEx {
   ParamNodeEx() { this.asNode() instanceof ParamNode }
 
-  predicate isParameterOf(DataFlowCallable c, int i) {
-    this.asNode().(ParamNode).isParameterOf(c, i)
+  predicate isParameterOf(DataFlowCallable c, ParameterPosition pos) {
+    this.asNode().(ParamNode).isParameterOf(c, pos)
   }
 
-  int getPosition() { this.isParameterOf(_, result) }
+  ParameterPosition getPosition() { this.isParameterOf(_, result) }
 
   predicate allowParameterReturnInSelf() { allowParameterReturnInSelfCached(this.asNode()) }
 }
@@ -289,6 +289,7 @@ private predicate outBarrier(NodeEx node, Configuration config) {
   )
 }
 
+pragma[nomagic]
 private predicate fullBarrier(NodeEx node, Configuration config) {
   exists(Node n | node.asNode() = n |
     config.isBarrier(n)
@@ -307,11 +308,23 @@ private predicate fullBarrier(NodeEx node, Configuration config) {
 }
 
 pragma[nomagic]
-private predicate sourceNode(NodeEx node, Configuration config) { config.isSource(node.asNode()) }
+private predicate sourceNode(NodeEx node, Configuration config) {
+  config.isSource(node.asNode()) and
+  not fullBarrier(node, config)
+}
 
 pragma[nomagic]
 private predicate sinkNode(NodeEx node, Configuration config) { config.isSink(node.asNode()) }
 
+/** Provides the relevant barriers for a step from `node1` to `node2`. */
+pragma[inline]
+private predicate stepFilter(NodeEx node1, NodeEx node2, Configuration config) {
+  not outBarrier(node1, config) and
+  not inBarrier(node2, config) and
+  not fullBarrier(node1, config) and
+  not fullBarrier(node2, config)
+}
+
 /**
  * Holds if data can flow in one local step from `node1` to `node2`.
  */
@@ -320,16 +333,14 @@ private predicate localFlowStep(NodeEx node1, NodeEx node2, Configuration config
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     simpleLocalFlowStepExt(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.asNode() = n and
-    node2.isImplicitReadNode(n, false)
+    node2.isImplicitReadNode(n, false) and
+    not fullBarrier(node1, config)
   )
 }
 
@@ -342,16 +353,14 @@ private predicate additionalLocalFlowStep(NodeEx node1, NodeEx node2, Configurat
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) = getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.isImplicitReadNode(n, true) and
-    node2.asNode() = n
+    node2.asNode() = n and
+    not fullBarrier(node2, config)
   )
 }
 
@@ -363,10 +372,7 @@ private predicate jumpStep(NodeEx node1, NodeEx node2, Configuration config) {
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     jumpStepCached(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
@@ -380,16 +386,14 @@ private predicate additionalJumpStep(NodeEx node1, NodeEx node2, Configuration c
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) != getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
 
 private predicate read(NodeEx node1, Content c, NodeEx node2, Configuration config) {
-  read(node1.asNode(), c, node2.asNode())
+  read(node1.asNode(), c, node2.asNode()) and
+  stepFilter(node1, node2, config)
   or
   exists(Node n |
     node2.isImplicitReadNode(n, true) and
@@ -402,7 +406,8 @@ private predicate store(
   NodeEx node1, TypedContent tc, NodeEx node2, DataFlowType contentType, Configuration config
 ) {
   store(node1.asNode(), tc, node2.asNode(), contentType) and
-  read(_, tc.getContent(), _, config)
+  read(_, tc.getContent(), _, config) and
+  stepFilter(node1, node2, config)
 }
 
 pragma[nomagic]
@@ -451,63 +456,59 @@ private module Stage1 {
    * argument in a call.
    */
   predicate fwdFlow(NodeEx node, Cc cc, Configuration config) {
-    not fullBarrier(node, config) and
-    (
-      sourceNode(node, config) and
-      if hasSourceCallCtx(config) then cc = true else cc = false
+    sourceNode(node, config) and
+    if hasSourceCallCtx(config) then cc = true else cc = false
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      localFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      additionalLocalFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      jumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      additionalJumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    // store
+    exists(NodeEx mid |
+      useFieldFlow(config) and
+      fwdFlow(mid, cc, config) and
+      store(mid, _, node, _, config)
+    )
+    or
+    // read
+    exists(Content c |
+      fwdFlowRead(c, node, cc, config) and
+      fwdFlowConsCand(c, config)
+    )
+    or
+    // flow into a callable
+    exists(NodeEx arg |
+      fwdFlow(arg, _, config) and
+      viableParamArgEx(_, node, arg) and
+      cc = true and
+      not fullBarrier(node, config)
+    )
+    or
+    // flow out of a callable
+    exists(DataFlowCall call |
+      fwdFlowOut(call, node, false, config) and
+      cc = false
       or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        localFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        additionalLocalFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        jumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        additionalJumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      // store
-      exists(NodeEx mid |
-        useFieldFlow(config) and
-        fwdFlow(mid, cc, config) and
-        store(mid, _, node, _, config) and
-        not outBarrier(mid, config)
-      )
-      or
-      // read
-      exists(Content c |
-        fwdFlowRead(c, node, cc, config) and
-        fwdFlowConsCand(c, config) and
-        not inBarrier(node, config)
-      )
-      or
-      // flow into a callable
-      exists(NodeEx arg |
-        fwdFlow(arg, _, config) and
-        viableParamArgEx(_, node, arg) and
-        cc = true
-      )
-      or
-      // flow out of a callable
-      exists(DataFlowCall call |
-        fwdFlowOut(call, node, false, config) and
-        cc = false
-        or
-        fwdFlowOutFromArg(call, node, config) and
-        fwdFlowIsEntered(call, cc, config)
-      )
+      fwdFlowOutFromArg(call, node, config) and
+      fwdFlowIsEntered(call, cc, config)
     )
   }
 
@@ -547,7 +548,8 @@ private module Stage1 {
   private predicate fwdFlowOut(DataFlowCall call, NodeEx out, Cc cc, Configuration config) {
     exists(ReturnPosition pos |
       fwdFlowReturnPosition(pos, cc, config) and
-      viableReturnPosOutEx(call, pos, out)
+      viableReturnPosOutEx(call, pos, out) and
+      not fullBarrier(out, config)
     )
   }
 
@@ -773,6 +775,7 @@ private module Stage1 {
    * Holds if flow may enter through `p` and reach a return node making `p` a
    * candidate for the origin of a summary.
    */
+  pragma[nomagic]
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
     exists(ReturnKindExt kind |
       throughFlowNodeCand(p, config) and
@@ -1009,6 +1012,9 @@ private module Stage2 {
 
   private predicate flowIntoCall = flowIntoCallNodeCand1/5;
 
+  bindingset[node, ap]
+  private predicate filter(NodeEx node, Ap ap) { any() }
+
   bindingset[ap, contentType]
   private predicate typecheckStore(Ap ap, DataFlowType contentType) { any() }
 
@@ -1017,14 +1023,23 @@ private module Stage2 {
     PrevStage::revFlow(node, _, _, apa, config)
   }
 
+  bindingset[result, apa]
+  private ApApprox unbindApa(ApApprox apa) {
+    exists(ApApprox apa0 |
+      apa = pragma[only_bind_into](apa0) and result = pragma[only_bind_into](apa0)
+    )
+  }
+
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1037,6 +1052,13 @@ private module Stage2 {
    */
   pragma[nomagic]
   predicate fwdFlow(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
+    fwdFlow0(node, cc, argAp, ap, config) and
+    flowCand(node, unbindApa(getApprox(ap)), config) and
+    filter(node, ap)
+  }
+
+  pragma[nomagic]
+  private predicate fwdFlow0(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
     flowCand(node, _, config) and
     sourceNode(node, config) and
     (if hasSourceCallCtx(config) then cc = ccSomeCall() else cc = ccNone()) and
@@ -1107,7 +1129,7 @@ private module Stage2 {
   ) {
     exists(DataFlowType contentType |
       fwdFlow(node1, cc, argAp, ap1, config) and
-      PrevStage::storeStepCand(node1, getApprox(ap1), tc, node2, contentType, config) and
+      PrevStage::storeStepCand(node1, unbindApa(getApprox(ap1)), tc, node2, contentType, config) and
       typecheckStore(ap1, contentType)
     )
   }
@@ -1142,9 +1164,8 @@ private module Stage2 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1159,9 +1180,8 @@ private module Stage2 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1171,10 +1191,8 @@ private module Stage2 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1188,7 +1206,7 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p |
       fwdFlowIn(call, p, cc, _, argAp, ap, config) and
-      PrevStage::parameterMayFlowThrough(p, _, getApprox(ap), config)
+      PrevStage::parameterMayFlowThrough(p, _, unbindApa(getApprox(ap)), config)
     )
   }
 
@@ -1230,6 +1248,11 @@ private module Stage2 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -1306,7 +1329,7 @@ private module Stage2 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -1341,9 +1364,8 @@ private module Stage2 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1353,9 +1375,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1365,9 +1386,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1427,7 +1447,7 @@ private module Stage2 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -1707,12 +1727,14 @@ private module Stage3 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1837,9 +1859,8 @@ private module Stage3 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1854,9 +1875,8 @@ private module Stage3 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1866,10 +1886,8 @@ private module Stage3 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1925,6 +1943,11 @@ private module Stage3 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2001,7 +2024,7 @@ private module Stage3 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2036,9 +2059,8 @@ private module Stage3 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2048,9 +2070,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2060,9 +2081,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2122,7 +2142,7 @@ private module Stage3 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2473,12 +2493,14 @@ private module Stage4 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -2603,9 +2625,8 @@ private module Stage4 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2620,9 +2641,8 @@ private module Stage4 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2632,10 +2652,8 @@ private module Stage4 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2691,6 +2709,11 @@ private module Stage4 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2767,7 +2790,7 @@ private module Stage4 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2802,9 +2825,8 @@ private module Stage4 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2814,9 +2836,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2826,9 +2847,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2888,7 +2908,7 @@ private module Stage4 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2972,7 +2992,7 @@ private class SummaryCtxSome extends SummaryCtx, TSummaryCtxSome {
 
   SummaryCtxSome() { this = TSummaryCtxSome(p, ap) }
 
-  int getParameterPos() { p.isParameterOf(_, result) }
+  ParameterPosition getParameterPos() { p.isParameterOf(_, result) }
 
   ParamNodeEx getParamNode() { result = p }
 
@@ -3619,39 +3639,40 @@ private predicate pathOutOfCallable(PathNodeMid mid, NodeEx out, CallContext cc)
  */
 pragma[noinline]
 private predicate pathIntoArg(
-  PathNodeMid mid, int i, CallContext cc, DataFlowCall call, AccessPath ap, AccessPathApprox apa,
-  Configuration config
+  PathNodeMid mid, ParameterPosition ppos, CallContext cc, DataFlowCall call, AccessPath ap,
+  AccessPathApprox apa, Configuration config
 ) {
-  exists(ArgNode arg |
+  exists(ArgNode arg, ArgumentPosition apos |
     arg = mid.getNodeEx().asNode() and
     cc = mid.getCallContext() and
-    arg.argumentOf(call, i) and
+    arg.argumentOf(call, apos) and
     ap = mid.getAp() and
     apa = ap.getApprox() and
-    config = mid.getConfiguration()
+    config = mid.getConfiguration() and
+    parameterMatch(ppos, apos)
   )
 }
 
 pragma[nomagic]
 private predicate parameterCand(
-  DataFlowCallable callable, int i, AccessPathApprox apa, Configuration config
+  DataFlowCallable callable, ParameterPosition pos, AccessPathApprox apa, Configuration config
 ) {
   exists(ParamNodeEx p |
     Stage4::revFlow(p, _, _, apa, config) and
-    p.isParameterOf(callable, i)
+    p.isParameterOf(callable, pos)
   )
 }
 
 pragma[nomagic]
 private predicate pathIntoCallable0(
-  PathNodeMid mid, DataFlowCallable callable, int i, CallContext outercc, DataFlowCall call,
-  AccessPath ap, Configuration config
+  PathNodeMid mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
+  DataFlowCall call, AccessPath ap, Configuration config
 ) {
   exists(AccessPathApprox apa |
-    pathIntoArg(mid, pragma[only_bind_into](i), outercc, call, ap, pragma[only_bind_into](apa),
+    pathIntoArg(mid, pragma[only_bind_into](pos), outercc, call, ap, pragma[only_bind_into](apa),
       pragma[only_bind_into](config)) and
     callable = resolveCall(call, outercc) and
-    parameterCand(callable, pragma[only_bind_into](i), pragma[only_bind_into](apa),
+    parameterCand(callable, pragma[only_bind_into](pos), pragma[only_bind_into](apa),
       pragma[only_bind_into](config))
   )
 }
@@ -3666,9 +3687,9 @@ private predicate pathIntoCallable(
   PathNodeMid mid, ParamNodeEx p, CallContext outercc, CallContextCall innercc, SummaryCtx sc,
   DataFlowCall call, Configuration config
 ) {
-  exists(int i, DataFlowCallable callable, AccessPath ap |
-    pathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-    p.isParameterOf(callable, i) and
+  exists(ParameterPosition pos, DataFlowCallable callable, AccessPath ap |
+    pathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+    p.isParameterOf(callable, pos) and
     (
       sc = TSummaryCtxSome(p, ap)
       or
@@ -3692,7 +3713,7 @@ private predicate paramFlowsThrough(
   ReturnKindExt kind, CallContextCall cc, SummaryCtxSome sc, AccessPath ap, AccessPathApprox apa,
   Configuration config
 ) {
-  exists(PathNodeMid mid, RetNodeEx ret, int pos |
+  exists(PathNodeMid mid, RetNodeEx ret, ParameterPosition pos |
     mid.getNodeEx() = ret and
     kind = ret.getKind() and
     cc = mid.getCallContext() and
@@ -4421,24 +4442,25 @@ private module FlowExploration {
 
   pragma[noinline]
   private predicate partialPathIntoArg(
-    PartialPathNodeFwd mid, int i, CallContext cc, DataFlowCall call, PartialAccessPath ap,
-    Configuration config
+    PartialPathNodeFwd mid, ParameterPosition ppos, CallContext cc, DataFlowCall call,
+    PartialAccessPath ap, Configuration config
   ) {
-    exists(ArgNode arg |
+    exists(ArgNode arg, ArgumentPosition apos |
       arg = mid.getNodeEx().asNode() and
       cc = mid.getCallContext() and
-      arg.argumentOf(call, i) and
+      arg.argumentOf(call, apos) and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate partialPathIntoCallable0(
-    PartialPathNodeFwd mid, DataFlowCallable callable, int i, CallContext outercc,
+    PartialPathNodeFwd mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
     DataFlowCall call, PartialAccessPath ap, Configuration config
   ) {
-    partialPathIntoArg(mid, i, outercc, call, ap, config) and
+    partialPathIntoArg(mid, pos, outercc, call, ap, config) and
     callable = resolveCall(call, outercc)
   }
 
@@ -4447,9 +4469,9 @@ private module FlowExploration {
     TSummaryCtx1 sc1, TSummaryCtx2 sc2, DataFlowCall call, PartialAccessPath ap,
     Configuration config
   ) {
-    exists(int i, DataFlowCallable callable |
-      partialPathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-      p.isParameterOf(callable, i) and
+    exists(ParameterPosition pos, DataFlowCallable callable |
+      partialPathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+      p.isParameterOf(callable, pos) and
       sc1 = TSummaryCtx1Param(p) and
       sc2 = TSummaryCtx2Some(ap)
     |
@@ -4613,22 +4635,23 @@ private module FlowExploration {
 
   pragma[nomagic]
   private predicate revPartialPathFlowsThrough(
-    int pos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2, RevPartialAccessPath ap,
-    Configuration config
+    ArgumentPosition apos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2,
+    RevPartialAccessPath ap, Configuration config
   ) {
-    exists(PartialPathNodeRev mid, ParamNodeEx p |
+    exists(PartialPathNodeRev mid, ParamNodeEx p, ParameterPosition ppos |
       mid.getNodeEx() = p and
-      p.getPosition() = pos and
+      p.getPosition() = ppos and
       sc1 = mid.getSummaryCtx1() and
       sc2 = mid.getSummaryCtx2() and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate revPartialPathThroughCallable0(
-    DataFlowCall call, PartialPathNodeRev mid, int pos, RevPartialAccessPath ap,
+    DataFlowCall call, PartialPathNodeRev mid, ArgumentPosition pos, RevPartialAccessPath ap,
     Configuration config
   ) {
     exists(TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2 |
@@ -4641,7 +4664,7 @@ private module FlowExploration {
   private predicate revPartialPathThroughCallable(
     PartialPathNodeRev mid, ArgNodeEx node, RevPartialAccessPath ap, Configuration config
   ) {
-    exists(DataFlowCall call, int pos |
+    exists(DataFlowCall call, ArgumentPosition pos |
       revPartialPathThroughCallable0(call, mid, pos, ap, config) and
       node.asNode().(ArgNode).argumentOf(call, pos)
     )

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowImpl3.qll

@@ -256,11 +256,11 @@ private class ArgNodeEx extends NodeEx {
 private class ParamNodeEx extends NodeEx {
   ParamNodeEx() { this.asNode() instanceof ParamNode }
 
-  predicate isParameterOf(DataFlowCallable c, int i) {
-    this.asNode().(ParamNode).isParameterOf(c, i)
+  predicate isParameterOf(DataFlowCallable c, ParameterPosition pos) {
+    this.asNode().(ParamNode).isParameterOf(c, pos)
   }
 
-  int getPosition() { this.isParameterOf(_, result) }
+  ParameterPosition getPosition() { this.isParameterOf(_, result) }
 
   predicate allowParameterReturnInSelf() { allowParameterReturnInSelfCached(this.asNode()) }
 }
@@ -289,6 +289,7 @@ private predicate outBarrier(NodeEx node, Configuration config) {
   )
 }
 
+pragma[nomagic]
 private predicate fullBarrier(NodeEx node, Configuration config) {
   exists(Node n | node.asNode() = n |
     config.isBarrier(n)
@@ -307,11 +308,23 @@ private predicate fullBarrier(NodeEx node, Configuration config) {
 }
 
 pragma[nomagic]
-private predicate sourceNode(NodeEx node, Configuration config) { config.isSource(node.asNode()) }
+private predicate sourceNode(NodeEx node, Configuration config) {
+  config.isSource(node.asNode()) and
+  not fullBarrier(node, config)
+}
 
 pragma[nomagic]
 private predicate sinkNode(NodeEx node, Configuration config) { config.isSink(node.asNode()) }
 
+/** Provides the relevant barriers for a step from `node1` to `node2`. */
+pragma[inline]
+private predicate stepFilter(NodeEx node1, NodeEx node2, Configuration config) {
+  not outBarrier(node1, config) and
+  not inBarrier(node2, config) and
+  not fullBarrier(node1, config) and
+  not fullBarrier(node2, config)
+}
+
 /**
  * Holds if data can flow in one local step from `node1` to `node2`.
  */
@@ -320,16 +333,14 @@ private predicate localFlowStep(NodeEx node1, NodeEx node2, Configuration config
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     simpleLocalFlowStepExt(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.asNode() = n and
-    node2.isImplicitReadNode(n, false)
+    node2.isImplicitReadNode(n, false) and
+    not fullBarrier(node1, config)
   )
 }
 
@@ -342,16 +353,14 @@ private predicate additionalLocalFlowStep(NodeEx node1, NodeEx node2, Configurat
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) = getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.isImplicitReadNode(n, true) and
-    node2.asNode() = n
+    node2.asNode() = n and
+    not fullBarrier(node2, config)
   )
 }
 
@@ -363,10 +372,7 @@ private predicate jumpStep(NodeEx node1, NodeEx node2, Configuration config) {
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     jumpStepCached(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
@@ -380,16 +386,14 @@ private predicate additionalJumpStep(NodeEx node1, NodeEx node2, Configuration c
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) != getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
 
 private predicate read(NodeEx node1, Content c, NodeEx node2, Configuration config) {
-  read(node1.asNode(), c, node2.asNode())
+  read(node1.asNode(), c, node2.asNode()) and
+  stepFilter(node1, node2, config)
   or
   exists(Node n |
     node2.isImplicitReadNode(n, true) and
@@ -402,7 +406,8 @@ private predicate store(
   NodeEx node1, TypedContent tc, NodeEx node2, DataFlowType contentType, Configuration config
 ) {
   store(node1.asNode(), tc, node2.asNode(), contentType) and
-  read(_, tc.getContent(), _, config)
+  read(_, tc.getContent(), _, config) and
+  stepFilter(node1, node2, config)
 }
 
 pragma[nomagic]
@@ -451,63 +456,59 @@ private module Stage1 {
    * argument in a call.
    */
   predicate fwdFlow(NodeEx node, Cc cc, Configuration config) {
-    not fullBarrier(node, config) and
-    (
-      sourceNode(node, config) and
-      if hasSourceCallCtx(config) then cc = true else cc = false
+    sourceNode(node, config) and
+    if hasSourceCallCtx(config) then cc = true else cc = false
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      localFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      additionalLocalFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      jumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      additionalJumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    // store
+    exists(NodeEx mid |
+      useFieldFlow(config) and
+      fwdFlow(mid, cc, config) and
+      store(mid, _, node, _, config)
+    )
+    or
+    // read
+    exists(Content c |
+      fwdFlowRead(c, node, cc, config) and
+      fwdFlowConsCand(c, config)
+    )
+    or
+    // flow into a callable
+    exists(NodeEx arg |
+      fwdFlow(arg, _, config) and
+      viableParamArgEx(_, node, arg) and
+      cc = true and
+      not fullBarrier(node, config)
+    )
+    or
+    // flow out of a callable
+    exists(DataFlowCall call |
+      fwdFlowOut(call, node, false, config) and
+      cc = false
       or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        localFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        additionalLocalFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        jumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        additionalJumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      // store
-      exists(NodeEx mid |
-        useFieldFlow(config) and
-        fwdFlow(mid, cc, config) and
-        store(mid, _, node, _, config) and
-        not outBarrier(mid, config)
-      )
-      or
-      // read
-      exists(Content c |
-        fwdFlowRead(c, node, cc, config) and
-        fwdFlowConsCand(c, config) and
-        not inBarrier(node, config)
-      )
-      or
-      // flow into a callable
-      exists(NodeEx arg |
-        fwdFlow(arg, _, config) and
-        viableParamArgEx(_, node, arg) and
-        cc = true
-      )
-      or
-      // flow out of a callable
-      exists(DataFlowCall call |
-        fwdFlowOut(call, node, false, config) and
-        cc = false
-        or
-        fwdFlowOutFromArg(call, node, config) and
-        fwdFlowIsEntered(call, cc, config)
-      )
+      fwdFlowOutFromArg(call, node, config) and
+      fwdFlowIsEntered(call, cc, config)
     )
   }
 
@@ -547,7 +548,8 @@ private module Stage1 {
   private predicate fwdFlowOut(DataFlowCall call, NodeEx out, Cc cc, Configuration config) {
     exists(ReturnPosition pos |
       fwdFlowReturnPosition(pos, cc, config) and
-      viableReturnPosOutEx(call, pos, out)
+      viableReturnPosOutEx(call, pos, out) and
+      not fullBarrier(out, config)
     )
   }
 
@@ -773,6 +775,7 @@ private module Stage1 {
    * Holds if flow may enter through `p` and reach a return node making `p` a
    * candidate for the origin of a summary.
    */
+  pragma[nomagic]
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
     exists(ReturnKindExt kind |
       throughFlowNodeCand(p, config) and
@@ -1009,6 +1012,9 @@ private module Stage2 {
 
   private predicate flowIntoCall = flowIntoCallNodeCand1/5;
 
+  bindingset[node, ap]
+  private predicate filter(NodeEx node, Ap ap) { any() }
+
   bindingset[ap, contentType]
   private predicate typecheckStore(Ap ap, DataFlowType contentType) { any() }
 
@@ -1017,14 +1023,23 @@ private module Stage2 {
     PrevStage::revFlow(node, _, _, apa, config)
   }
 
+  bindingset[result, apa]
+  private ApApprox unbindApa(ApApprox apa) {
+    exists(ApApprox apa0 |
+      apa = pragma[only_bind_into](apa0) and result = pragma[only_bind_into](apa0)
+    )
+  }
+
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1037,6 +1052,13 @@ private module Stage2 {
    */
   pragma[nomagic]
   predicate fwdFlow(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
+    fwdFlow0(node, cc, argAp, ap, config) and
+    flowCand(node, unbindApa(getApprox(ap)), config) and
+    filter(node, ap)
+  }
+
+  pragma[nomagic]
+  private predicate fwdFlow0(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
     flowCand(node, _, config) and
     sourceNode(node, config) and
     (if hasSourceCallCtx(config) then cc = ccSomeCall() else cc = ccNone()) and
@@ -1107,7 +1129,7 @@ private module Stage2 {
   ) {
     exists(DataFlowType contentType |
       fwdFlow(node1, cc, argAp, ap1, config) and
-      PrevStage::storeStepCand(node1, getApprox(ap1), tc, node2, contentType, config) and
+      PrevStage::storeStepCand(node1, unbindApa(getApprox(ap1)), tc, node2, contentType, config) and
       typecheckStore(ap1, contentType)
     )
   }
@@ -1142,9 +1164,8 @@ private module Stage2 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1159,9 +1180,8 @@ private module Stage2 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1171,10 +1191,8 @@ private module Stage2 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1188,7 +1206,7 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p |
       fwdFlowIn(call, p, cc, _, argAp, ap, config) and
-      PrevStage::parameterMayFlowThrough(p, _, getApprox(ap), config)
+      PrevStage::parameterMayFlowThrough(p, _, unbindApa(getApprox(ap)), config)
     )
   }
 
@@ -1230,6 +1248,11 @@ private module Stage2 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -1306,7 +1329,7 @@ private module Stage2 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -1341,9 +1364,8 @@ private module Stage2 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1353,9 +1375,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1365,9 +1386,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1427,7 +1447,7 @@ private module Stage2 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -1707,12 +1727,14 @@ private module Stage3 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1837,9 +1859,8 @@ private module Stage3 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1854,9 +1875,8 @@ private module Stage3 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1866,10 +1886,8 @@ private module Stage3 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1925,6 +1943,11 @@ private module Stage3 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2001,7 +2024,7 @@ private module Stage3 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2036,9 +2059,8 @@ private module Stage3 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2048,9 +2070,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2060,9 +2081,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2122,7 +2142,7 @@ private module Stage3 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2473,12 +2493,14 @@ private module Stage4 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -2603,9 +2625,8 @@ private module Stage4 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2620,9 +2641,8 @@ private module Stage4 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2632,10 +2652,8 @@ private module Stage4 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2691,6 +2709,11 @@ private module Stage4 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2767,7 +2790,7 @@ private module Stage4 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2802,9 +2825,8 @@ private module Stage4 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2814,9 +2836,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2826,9 +2847,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2888,7 +2908,7 @@ private module Stage4 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2972,7 +2992,7 @@ private class SummaryCtxSome extends SummaryCtx, TSummaryCtxSome {
 
   SummaryCtxSome() { this = TSummaryCtxSome(p, ap) }
 
-  int getParameterPos() { p.isParameterOf(_, result) }
+  ParameterPosition getParameterPos() { p.isParameterOf(_, result) }
 
   ParamNodeEx getParamNode() { result = p }
 
@@ -3619,39 +3639,40 @@ private predicate pathOutOfCallable(PathNodeMid mid, NodeEx out, CallContext cc)
  */
 pragma[noinline]
 private predicate pathIntoArg(
-  PathNodeMid mid, int i, CallContext cc, DataFlowCall call, AccessPath ap, AccessPathApprox apa,
-  Configuration config
+  PathNodeMid mid, ParameterPosition ppos, CallContext cc, DataFlowCall call, AccessPath ap,
+  AccessPathApprox apa, Configuration config
 ) {
-  exists(ArgNode arg |
+  exists(ArgNode arg, ArgumentPosition apos |
     arg = mid.getNodeEx().asNode() and
     cc = mid.getCallContext() and
-    arg.argumentOf(call, i) and
+    arg.argumentOf(call, apos) and
     ap = mid.getAp() and
     apa = ap.getApprox() and
-    config = mid.getConfiguration()
+    config = mid.getConfiguration() and
+    parameterMatch(ppos, apos)
   )
 }
 
 pragma[nomagic]
 private predicate parameterCand(
-  DataFlowCallable callable, int i, AccessPathApprox apa, Configuration config
+  DataFlowCallable callable, ParameterPosition pos, AccessPathApprox apa, Configuration config
 ) {
   exists(ParamNodeEx p |
     Stage4::revFlow(p, _, _, apa, config) and
-    p.isParameterOf(callable, i)
+    p.isParameterOf(callable, pos)
   )
 }
 
 pragma[nomagic]
 private predicate pathIntoCallable0(
-  PathNodeMid mid, DataFlowCallable callable, int i, CallContext outercc, DataFlowCall call,
-  AccessPath ap, Configuration config
+  PathNodeMid mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
+  DataFlowCall call, AccessPath ap, Configuration config
 ) {
   exists(AccessPathApprox apa |
-    pathIntoArg(mid, pragma[only_bind_into](i), outercc, call, ap, pragma[only_bind_into](apa),
+    pathIntoArg(mid, pragma[only_bind_into](pos), outercc, call, ap, pragma[only_bind_into](apa),
       pragma[only_bind_into](config)) and
     callable = resolveCall(call, outercc) and
-    parameterCand(callable, pragma[only_bind_into](i), pragma[only_bind_into](apa),
+    parameterCand(callable, pragma[only_bind_into](pos), pragma[only_bind_into](apa),
       pragma[only_bind_into](config))
   )
 }
@@ -3666,9 +3687,9 @@ private predicate pathIntoCallable(
   PathNodeMid mid, ParamNodeEx p, CallContext outercc, CallContextCall innercc, SummaryCtx sc,
   DataFlowCall call, Configuration config
 ) {
-  exists(int i, DataFlowCallable callable, AccessPath ap |
-    pathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-    p.isParameterOf(callable, i) and
+  exists(ParameterPosition pos, DataFlowCallable callable, AccessPath ap |
+    pathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+    p.isParameterOf(callable, pos) and
     (
       sc = TSummaryCtxSome(p, ap)
       or
@@ -3692,7 +3713,7 @@ private predicate paramFlowsThrough(
   ReturnKindExt kind, CallContextCall cc, SummaryCtxSome sc, AccessPath ap, AccessPathApprox apa,
   Configuration config
 ) {
-  exists(PathNodeMid mid, RetNodeEx ret, int pos |
+  exists(PathNodeMid mid, RetNodeEx ret, ParameterPosition pos |
     mid.getNodeEx() = ret and
     kind = ret.getKind() and
     cc = mid.getCallContext() and
@@ -4421,24 +4442,25 @@ private module FlowExploration {
 
   pragma[noinline]
   private predicate partialPathIntoArg(
-    PartialPathNodeFwd mid, int i, CallContext cc, DataFlowCall call, PartialAccessPath ap,
-    Configuration config
+    PartialPathNodeFwd mid, ParameterPosition ppos, CallContext cc, DataFlowCall call,
+    PartialAccessPath ap, Configuration config
   ) {
-    exists(ArgNode arg |
+    exists(ArgNode arg, ArgumentPosition apos |
       arg = mid.getNodeEx().asNode() and
       cc = mid.getCallContext() and
-      arg.argumentOf(call, i) and
+      arg.argumentOf(call, apos) and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate partialPathIntoCallable0(
-    PartialPathNodeFwd mid, DataFlowCallable callable, int i, CallContext outercc,
+    PartialPathNodeFwd mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
     DataFlowCall call, PartialAccessPath ap, Configuration config
   ) {
-    partialPathIntoArg(mid, i, outercc, call, ap, config) and
+    partialPathIntoArg(mid, pos, outercc, call, ap, config) and
     callable = resolveCall(call, outercc)
   }
 
@@ -4447,9 +4469,9 @@ private module FlowExploration {
     TSummaryCtx1 sc1, TSummaryCtx2 sc2, DataFlowCall call, PartialAccessPath ap,
     Configuration config
   ) {
-    exists(int i, DataFlowCallable callable |
-      partialPathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-      p.isParameterOf(callable, i) and
+    exists(ParameterPosition pos, DataFlowCallable callable |
+      partialPathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+      p.isParameterOf(callable, pos) and
       sc1 = TSummaryCtx1Param(p) and
       sc2 = TSummaryCtx2Some(ap)
     |
@@ -4613,22 +4635,23 @@ private module FlowExploration {
 
   pragma[nomagic]
   private predicate revPartialPathFlowsThrough(
-    int pos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2, RevPartialAccessPath ap,
-    Configuration config
+    ArgumentPosition apos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2,
+    RevPartialAccessPath ap, Configuration config
   ) {
-    exists(PartialPathNodeRev mid, ParamNodeEx p |
+    exists(PartialPathNodeRev mid, ParamNodeEx p, ParameterPosition ppos |
       mid.getNodeEx() = p and
-      p.getPosition() = pos and
+      p.getPosition() = ppos and
       sc1 = mid.getSummaryCtx1() and
       sc2 = mid.getSummaryCtx2() and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate revPartialPathThroughCallable0(
-    DataFlowCall call, PartialPathNodeRev mid, int pos, RevPartialAccessPath ap,
+    DataFlowCall call, PartialPathNodeRev mid, ArgumentPosition pos, RevPartialAccessPath ap,
     Configuration config
   ) {
     exists(TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2 |
@@ -4641,7 +4664,7 @@ private module FlowExploration {
   private predicate revPartialPathThroughCallable(
     PartialPathNodeRev mid, ArgNodeEx node, RevPartialAccessPath ap, Configuration config
   ) {
-    exists(DataFlowCall call, int pos |
+    exists(DataFlowCall call, ArgumentPosition pos |
       revPartialPathThroughCallable0(call, mid, pos, ap, config) and
       node.asNode().(ArgNode).argumentOf(call, pos)
     )

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowImpl4.qll

@@ -256,11 +256,11 @@ private class ArgNodeEx extends NodeEx {
 private class ParamNodeEx extends NodeEx {
   ParamNodeEx() { this.asNode() instanceof ParamNode }
 
-  predicate isParameterOf(DataFlowCallable c, int i) {
-    this.asNode().(ParamNode).isParameterOf(c, i)
+  predicate isParameterOf(DataFlowCallable c, ParameterPosition pos) {
+    this.asNode().(ParamNode).isParameterOf(c, pos)
   }
 
-  int getPosition() { this.isParameterOf(_, result) }
+  ParameterPosition getPosition() { this.isParameterOf(_, result) }
 
   predicate allowParameterReturnInSelf() { allowParameterReturnInSelfCached(this.asNode()) }
 }
@@ -289,6 +289,7 @@ private predicate outBarrier(NodeEx node, Configuration config) {
   )
 }
 
+pragma[nomagic]
 private predicate fullBarrier(NodeEx node, Configuration config) {
   exists(Node n | node.asNode() = n |
     config.isBarrier(n)
@@ -307,11 +308,23 @@ private predicate fullBarrier(NodeEx node, Configuration config) {
 }
 
 pragma[nomagic]
-private predicate sourceNode(NodeEx node, Configuration config) { config.isSource(node.asNode()) }
+private predicate sourceNode(NodeEx node, Configuration config) {
+  config.isSource(node.asNode()) and
+  not fullBarrier(node, config)
+}
 
 pragma[nomagic]
 private predicate sinkNode(NodeEx node, Configuration config) { config.isSink(node.asNode()) }
 
+/** Provides the relevant barriers for a step from `node1` to `node2`. */
+pragma[inline]
+private predicate stepFilter(NodeEx node1, NodeEx node2, Configuration config) {
+  not outBarrier(node1, config) and
+  not inBarrier(node2, config) and
+  not fullBarrier(node1, config) and
+  not fullBarrier(node2, config)
+}
+
 /**
  * Holds if data can flow in one local step from `node1` to `node2`.
  */
@@ -320,16 +333,14 @@ private predicate localFlowStep(NodeEx node1, NodeEx node2, Configuration config
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     simpleLocalFlowStepExt(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.asNode() = n and
-    node2.isImplicitReadNode(n, false)
+    node2.isImplicitReadNode(n, false) and
+    not fullBarrier(node1, config)
   )
 }
 
@@ -342,16 +353,14 @@ private predicate additionalLocalFlowStep(NodeEx node1, NodeEx node2, Configurat
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) = getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config)
+    stepFilter(node1, node2, config)
   )
   or
   exists(Node n |
     config.allowImplicitRead(n, _) and
     node1.isImplicitReadNode(n, true) and
-    node2.asNode() = n
+    node2.asNode() = n and
+    not fullBarrier(node2, config)
   )
 }
 
@@ -363,10 +372,7 @@ private predicate jumpStep(NodeEx node1, NodeEx node2, Configuration config) {
     node1.asNode() = n1 and
     node2.asNode() = n2 and
     jumpStepCached(n1, n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
@@ -380,16 +386,14 @@ private predicate additionalJumpStep(NodeEx node1, NodeEx node2, Configuration c
     node2.asNode() = n2 and
     config.isAdditionalFlowStep(n1, n2) and
     getNodeEnclosingCallable(n1) != getNodeEnclosingCallable(n2) and
-    not outBarrier(node1, config) and
-    not inBarrier(node2, config) and
-    not fullBarrier(node1, config) and
-    not fullBarrier(node2, config) and
+    stepFilter(node1, node2, config) and
     not config.getAFeature() instanceof FeatureEqualSourceSinkCallContext
   )
 }
 
 private predicate read(NodeEx node1, Content c, NodeEx node2, Configuration config) {
-  read(node1.asNode(), c, node2.asNode())
+  read(node1.asNode(), c, node2.asNode()) and
+  stepFilter(node1, node2, config)
   or
   exists(Node n |
     node2.isImplicitReadNode(n, true) and
@@ -402,7 +406,8 @@ private predicate store(
   NodeEx node1, TypedContent tc, NodeEx node2, DataFlowType contentType, Configuration config
 ) {
   store(node1.asNode(), tc, node2.asNode(), contentType) and
-  read(_, tc.getContent(), _, config)
+  read(_, tc.getContent(), _, config) and
+  stepFilter(node1, node2, config)
 }
 
 pragma[nomagic]
@@ -451,63 +456,59 @@ private module Stage1 {
    * argument in a call.
    */
   predicate fwdFlow(NodeEx node, Cc cc, Configuration config) {
-    not fullBarrier(node, config) and
-    (
-      sourceNode(node, config) and
-      if hasSourceCallCtx(config) then cc = true else cc = false
+    sourceNode(node, config) and
+    if hasSourceCallCtx(config) then cc = true else cc = false
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      localFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, cc, config) and
+      additionalLocalFlowStep(mid, node, config)
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      jumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    exists(NodeEx mid |
+      fwdFlow(mid, _, config) and
+      additionalJumpStep(mid, node, config) and
+      cc = false
+    )
+    or
+    // store
+    exists(NodeEx mid |
+      useFieldFlow(config) and
+      fwdFlow(mid, cc, config) and
+      store(mid, _, node, _, config)
+    )
+    or
+    // read
+    exists(Content c |
+      fwdFlowRead(c, node, cc, config) and
+      fwdFlowConsCand(c, config)
+    )
+    or
+    // flow into a callable
+    exists(NodeEx arg |
+      fwdFlow(arg, _, config) and
+      viableParamArgEx(_, node, arg) and
+      cc = true and
+      not fullBarrier(node, config)
+    )
+    or
+    // flow out of a callable
+    exists(DataFlowCall call |
+      fwdFlowOut(call, node, false, config) and
+      cc = false
       or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        localFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, cc, config) and
-        additionalLocalFlowStep(mid, node, config)
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        jumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      exists(NodeEx mid |
-        fwdFlow(mid, _, config) and
-        additionalJumpStep(mid, node, config) and
-        cc = false
-      )
-      or
-      // store
-      exists(NodeEx mid |
-        useFieldFlow(config) and
-        fwdFlow(mid, cc, config) and
-        store(mid, _, node, _, config) and
-        not outBarrier(mid, config)
-      )
-      or
-      // read
-      exists(Content c |
-        fwdFlowRead(c, node, cc, config) and
-        fwdFlowConsCand(c, config) and
-        not inBarrier(node, config)
-      )
-      or
-      // flow into a callable
-      exists(NodeEx arg |
-        fwdFlow(arg, _, config) and
-        viableParamArgEx(_, node, arg) and
-        cc = true
-      )
-      or
-      // flow out of a callable
-      exists(DataFlowCall call |
-        fwdFlowOut(call, node, false, config) and
-        cc = false
-        or
-        fwdFlowOutFromArg(call, node, config) and
-        fwdFlowIsEntered(call, cc, config)
-      )
+      fwdFlowOutFromArg(call, node, config) and
+      fwdFlowIsEntered(call, cc, config)
     )
   }
 
@@ -547,7 +548,8 @@ private module Stage1 {
   private predicate fwdFlowOut(DataFlowCall call, NodeEx out, Cc cc, Configuration config) {
     exists(ReturnPosition pos |
       fwdFlowReturnPosition(pos, cc, config) and
-      viableReturnPosOutEx(call, pos, out)
+      viableReturnPosOutEx(call, pos, out) and
+      not fullBarrier(out, config)
     )
   }
 
@@ -773,6 +775,7 @@ private module Stage1 {
    * Holds if flow may enter through `p` and reach a return node making `p` a
    * candidate for the origin of a summary.
    */
+  pragma[nomagic]
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
     exists(ReturnKindExt kind |
       throughFlowNodeCand(p, config) and
@@ -1009,6 +1012,9 @@ private module Stage2 {
 
   private predicate flowIntoCall = flowIntoCallNodeCand1/5;
 
+  bindingset[node, ap]
+  private predicate filter(NodeEx node, Ap ap) { any() }
+
   bindingset[ap, contentType]
   private predicate typecheckStore(Ap ap, DataFlowType contentType) { any() }
 
@@ -1017,14 +1023,23 @@ private module Stage2 {
     PrevStage::revFlow(node, _, _, apa, config)
   }
 
+  bindingset[result, apa]
+  private ApApprox unbindApa(ApApprox apa) {
+    exists(ApApprox apa0 |
+      apa = pragma[only_bind_into](apa0) and result = pragma[only_bind_into](apa0)
+    )
+  }
+
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1037,6 +1052,13 @@ private module Stage2 {
    */
   pragma[nomagic]
   predicate fwdFlow(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
+    fwdFlow0(node, cc, argAp, ap, config) and
+    flowCand(node, unbindApa(getApprox(ap)), config) and
+    filter(node, ap)
+  }
+
+  pragma[nomagic]
+  private predicate fwdFlow0(NodeEx node, Cc cc, ApOption argAp, Ap ap, Configuration config) {
     flowCand(node, _, config) and
     sourceNode(node, config) and
     (if hasSourceCallCtx(config) then cc = ccSomeCall() else cc = ccNone()) and
@@ -1107,7 +1129,7 @@ private module Stage2 {
   ) {
     exists(DataFlowType contentType |
       fwdFlow(node1, cc, argAp, ap1, config) and
-      PrevStage::storeStepCand(node1, getApprox(ap1), tc, node2, contentType, config) and
+      PrevStage::storeStepCand(node1, unbindApa(getApprox(ap1)), tc, node2, contentType, config) and
       typecheckStore(ap1, contentType)
     )
   }
@@ -1142,9 +1164,8 @@ private module Stage2 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1159,9 +1180,8 @@ private module Stage2 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1171,10 +1191,8 @@ private module Stage2 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1188,7 +1206,7 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p |
       fwdFlowIn(call, p, cc, _, argAp, ap, config) and
-      PrevStage::parameterMayFlowThrough(p, _, getApprox(ap), config)
+      PrevStage::parameterMayFlowThrough(p, _, unbindApa(getApprox(ap)), config)
     )
   }
 
@@ -1230,6 +1248,11 @@ private module Stage2 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -1306,7 +1329,7 @@ private module Stage2 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -1341,9 +1364,8 @@ private module Stage2 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1353,9 +1375,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1365,9 +1386,8 @@ private module Stage2 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1427,7 +1447,7 @@ private module Stage2 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -1707,12 +1727,14 @@ private module Stage3 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -1837,9 +1859,8 @@ private module Stage3 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1854,9 +1875,8 @@ private module Stage3 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1866,10 +1886,8 @@ private module Stage3 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -1925,6 +1943,11 @@ private module Stage3 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2001,7 +2024,7 @@ private module Stage3 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2036,9 +2059,8 @@ private module Stage3 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2048,9 +2070,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2060,9 +2081,8 @@ private module Stage3 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2122,7 +2142,7 @@ private module Stage3 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2473,12 +2493,14 @@ private module Stage4 {
 
   pragma[nomagic]
   private predicate flowThroughOutOfCall(
-    DataFlowCall call, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow, Configuration config
+    DataFlowCall call, CcCall ccc, RetNodeEx ret, NodeEx out, boolean allowsFieldFlow,
+    Configuration config
   ) {
     flowOutOfCall(call, ret, out, allowsFieldFlow, pragma[only_bind_into](config)) and
     PrevStage::callMayFlowThroughRev(call, pragma[only_bind_into](config)) and
     PrevStage::parameterMayFlowThrough(_, ret.getEnclosingCallable(), _,
-      pragma[only_bind_into](config))
+      pragma[only_bind_into](config)) and
+    ccc.matchesCall(call)
   }
 
   /**
@@ -2603,9 +2625,8 @@ private module Stage4 {
     exists(ArgNodeEx arg, boolean allowsFieldFlow |
       fwdFlow(arg, outercc, argAp, ap, config) and
       flowIntoCall(call, arg, p, allowsFieldFlow, config) and
-      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      innercc = getCallContextCall(call, p.getEnclosingCallable(), outercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2620,9 +2641,8 @@ private module Stage4 {
       fwdFlow(ret, innercc, argAp, ap, config) and
       flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
       inner = ret.getEnclosingCallable() and
-      ccOut = getCallContextReturn(inner, call, innercc)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      ccOut = getCallContextReturn(inner, call, innercc) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2632,10 +2652,8 @@ private module Stage4 {
   ) {
     exists(RetNodeEx ret, boolean allowsFieldFlow, CcCall ccc |
       fwdFlow(ret, ccc, apSome(argAp), ap, config) and
-      flowThroughOutOfCall(call, ret, out, allowsFieldFlow, config) and
-      ccc.matchesCall(call)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughOutOfCall(call, ccc, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2691,6 +2709,11 @@ private module Stage4 {
     callMayFlowThroughFwd(call, pragma[only_bind_into](config))
   }
 
+  pragma[nomagic]
+  private predicate returnNodeMayFlowThrough(RetNodeEx ret, Ap ap, Configuration config) {
+    fwdFlow(ret, any(CcCall ccc), apSome(_), ap, config)
+  }
+
   /**
    * Holds if `node` with access path `ap` is part of a path from a source to a
    * sink in the configuration `config`.
@@ -2767,7 +2790,7 @@ private module Stage4 {
     // flow out of a callable
     revFlowOut(_, node, _, _, ap, config) and
     toReturn = true and
-    if fwdFlow(node, any(CcCall ccc), apSome(_), ap, config)
+    if returnNodeMayFlowThrough(node, ap, config)
     then returnAp = apSome(ap)
     else returnAp = apNone()
   }
@@ -2802,9 +2825,8 @@ private module Stage4 {
   ) {
     exists(NodeEx out, boolean allowsFieldFlow |
       revFlow(out, toReturn, returnAp, ap, config) and
-      flowOutOfCall(call, ret, out, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowOutOfCall(call, ret, out, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2814,9 +2836,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, false, returnAp, ap, config) and
-      flowIntoCall(_, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowIntoCall(_, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2826,9 +2847,8 @@ private module Stage4 {
   ) {
     exists(ParamNodeEx p, boolean allowsFieldFlow |
       revFlow(p, true, apSome(returnAp), ap, config) and
-      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config)
-    |
-      ap instanceof ApNil or allowsFieldFlow = true
+      flowThroughIntoCall(call, arg, p, allowsFieldFlow, config) and
+      if allowsFieldFlow = false then ap instanceof ApNil else any()
     )
   }
 
@@ -2888,7 +2908,7 @@ private module Stage4 {
   }
 
   predicate parameterMayFlowThrough(ParamNodeEx p, DataFlowCallable c, Ap ap, Configuration config) {
-    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, int pos |
+    exists(RetNodeEx ret, Ap ap0, ReturnKindExt kind, ParameterPosition pos |
       parameterFlow(p, ap, ap0, c, config) and
       c = ret.getEnclosingCallable() and
       revFlow(pragma[only_bind_into](ret), true, apSome(_), pragma[only_bind_into](ap0),
@@ -2972,7 +2992,7 @@ private class SummaryCtxSome extends SummaryCtx, TSummaryCtxSome {
 
   SummaryCtxSome() { this = TSummaryCtxSome(p, ap) }
 
-  int getParameterPos() { p.isParameterOf(_, result) }
+  ParameterPosition getParameterPos() { p.isParameterOf(_, result) }
 
   ParamNodeEx getParamNode() { result = p }
 
@@ -3619,39 +3639,40 @@ private predicate pathOutOfCallable(PathNodeMid mid, NodeEx out, CallContext cc)
  */
 pragma[noinline]
 private predicate pathIntoArg(
-  PathNodeMid mid, int i, CallContext cc, DataFlowCall call, AccessPath ap, AccessPathApprox apa,
-  Configuration config
+  PathNodeMid mid, ParameterPosition ppos, CallContext cc, DataFlowCall call, AccessPath ap,
+  AccessPathApprox apa, Configuration config
 ) {
-  exists(ArgNode arg |
+  exists(ArgNode arg, ArgumentPosition apos |
     arg = mid.getNodeEx().asNode() and
     cc = mid.getCallContext() and
-    arg.argumentOf(call, i) and
+    arg.argumentOf(call, apos) and
     ap = mid.getAp() and
     apa = ap.getApprox() and
-    config = mid.getConfiguration()
+    config = mid.getConfiguration() and
+    parameterMatch(ppos, apos)
   )
 }
 
 pragma[nomagic]
 private predicate parameterCand(
-  DataFlowCallable callable, int i, AccessPathApprox apa, Configuration config
+  DataFlowCallable callable, ParameterPosition pos, AccessPathApprox apa, Configuration config
 ) {
   exists(ParamNodeEx p |
     Stage4::revFlow(p, _, _, apa, config) and
-    p.isParameterOf(callable, i)
+    p.isParameterOf(callable, pos)
   )
 }
 
 pragma[nomagic]
 private predicate pathIntoCallable0(
-  PathNodeMid mid, DataFlowCallable callable, int i, CallContext outercc, DataFlowCall call,
-  AccessPath ap, Configuration config
+  PathNodeMid mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
+  DataFlowCall call, AccessPath ap, Configuration config
 ) {
   exists(AccessPathApprox apa |
-    pathIntoArg(mid, pragma[only_bind_into](i), outercc, call, ap, pragma[only_bind_into](apa),
+    pathIntoArg(mid, pragma[only_bind_into](pos), outercc, call, ap, pragma[only_bind_into](apa),
       pragma[only_bind_into](config)) and
     callable = resolveCall(call, outercc) and
-    parameterCand(callable, pragma[only_bind_into](i), pragma[only_bind_into](apa),
+    parameterCand(callable, pragma[only_bind_into](pos), pragma[only_bind_into](apa),
       pragma[only_bind_into](config))
   )
 }
@@ -3666,9 +3687,9 @@ private predicate pathIntoCallable(
   PathNodeMid mid, ParamNodeEx p, CallContext outercc, CallContextCall innercc, SummaryCtx sc,
   DataFlowCall call, Configuration config
 ) {
-  exists(int i, DataFlowCallable callable, AccessPath ap |
-    pathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-    p.isParameterOf(callable, i) and
+  exists(ParameterPosition pos, DataFlowCallable callable, AccessPath ap |
+    pathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+    p.isParameterOf(callable, pos) and
     (
       sc = TSummaryCtxSome(p, ap)
       or
@@ -3692,7 +3713,7 @@ private predicate paramFlowsThrough(
   ReturnKindExt kind, CallContextCall cc, SummaryCtxSome sc, AccessPath ap, AccessPathApprox apa,
   Configuration config
 ) {
-  exists(PathNodeMid mid, RetNodeEx ret, int pos |
+  exists(PathNodeMid mid, RetNodeEx ret, ParameterPosition pos |
     mid.getNodeEx() = ret and
     kind = ret.getKind() and
     cc = mid.getCallContext() and
@@ -4421,24 +4442,25 @@ private module FlowExploration {
 
   pragma[noinline]
   private predicate partialPathIntoArg(
-    PartialPathNodeFwd mid, int i, CallContext cc, DataFlowCall call, PartialAccessPath ap,
-    Configuration config
+    PartialPathNodeFwd mid, ParameterPosition ppos, CallContext cc, DataFlowCall call,
+    PartialAccessPath ap, Configuration config
   ) {
-    exists(ArgNode arg |
+    exists(ArgNode arg, ArgumentPosition apos |
       arg = mid.getNodeEx().asNode() and
       cc = mid.getCallContext() and
-      arg.argumentOf(call, i) and
+      arg.argumentOf(call, apos) and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate partialPathIntoCallable0(
-    PartialPathNodeFwd mid, DataFlowCallable callable, int i, CallContext outercc,
+    PartialPathNodeFwd mid, DataFlowCallable callable, ParameterPosition pos, CallContext outercc,
     DataFlowCall call, PartialAccessPath ap, Configuration config
   ) {
-    partialPathIntoArg(mid, i, outercc, call, ap, config) and
+    partialPathIntoArg(mid, pos, outercc, call, ap, config) and
     callable = resolveCall(call, outercc)
   }
 
@@ -4447,9 +4469,9 @@ private module FlowExploration {
     TSummaryCtx1 sc1, TSummaryCtx2 sc2, DataFlowCall call, PartialAccessPath ap,
     Configuration config
   ) {
-    exists(int i, DataFlowCallable callable |
-      partialPathIntoCallable0(mid, callable, i, outercc, call, ap, config) and
-      p.isParameterOf(callable, i) and
+    exists(ParameterPosition pos, DataFlowCallable callable |
+      partialPathIntoCallable0(mid, callable, pos, outercc, call, ap, config) and
+      p.isParameterOf(callable, pos) and
       sc1 = TSummaryCtx1Param(p) and
       sc2 = TSummaryCtx2Some(ap)
     |
@@ -4613,22 +4635,23 @@ private module FlowExploration {
 
   pragma[nomagic]
   private predicate revPartialPathFlowsThrough(
-    int pos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2, RevPartialAccessPath ap,
-    Configuration config
+    ArgumentPosition apos, TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2,
+    RevPartialAccessPath ap, Configuration config
   ) {
-    exists(PartialPathNodeRev mid, ParamNodeEx p |
+    exists(PartialPathNodeRev mid, ParamNodeEx p, ParameterPosition ppos |
       mid.getNodeEx() = p and
-      p.getPosition() = pos and
+      p.getPosition() = ppos and
       sc1 = mid.getSummaryCtx1() and
       sc2 = mid.getSummaryCtx2() and
       ap = mid.getAp() and
-      config = mid.getConfiguration()
+      config = mid.getConfiguration() and
+      parameterMatch(ppos, apos)
     )
   }
 
   pragma[nomagic]
   private predicate revPartialPathThroughCallable0(
-    DataFlowCall call, PartialPathNodeRev mid, int pos, RevPartialAccessPath ap,
+    DataFlowCall call, PartialPathNodeRev mid, ArgumentPosition pos, RevPartialAccessPath ap,
     Configuration config
   ) {
     exists(TRevSummaryCtx1Some sc1, TRevSummaryCtx2Some sc2 |
@@ -4641,7 +4664,7 @@ private module FlowExploration {
   private predicate revPartialPathThroughCallable(
     PartialPathNodeRev mid, ArgNodeEx node, RevPartialAccessPath ap, Configuration config
   ) {
-    exists(DataFlowCall call, int pos |
+    exists(DataFlowCall call, ArgumentPosition pos |
       revPartialPathThroughCallable0(call, mid, pos, ap, config) and
       node.asNode().(ArgNode).argumentOf(call, pos)
     )

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowImplCommon.qll

@@ -62,6 +62,18 @@ predicate accessPathCostLimits(int apLimit, int tupleLimit) {
   tupleLimit = 1000
 }
 
+/**
+ * Holds if `arg` is an argument of `call` with an argument position that matches
+ * parameter position `ppos`.
+ */
+pragma[noinline]
+predicate argumentPositionMatch(DataFlowCall call, ArgNode arg, ParameterPosition ppos) {
+  exists(ArgumentPosition apos |
+    arg.argumentOf(call, apos) and
+    parameterMatch(ppos, apos)
+  )
+}
+
 /**
  * Provides a simple data-flow analysis for resolving lambda calls. The analysis
  * currently excludes read-steps, store-steps, and flow-through.
@@ -71,25 +83,27 @@ predicate accessPathCostLimits(int apLimit, int tupleLimit) {
  * calls. For this reason, we cannot reuse the code from `DataFlowImpl.qll` directly.
  */
 private module LambdaFlow {
-  private predicate viableParamNonLambda(DataFlowCall call, int i, ParamNode p) {
-    p.isParameterOf(viableCallable(call), i)
+  pragma[noinline]
+  private predicate viableParamNonLambda(DataFlowCall call, ParameterPosition ppos, ParamNode p) {
+    p.isParameterOf(viableCallable(call), ppos)
   }
 
-  private predicate viableParamLambda(DataFlowCall call, int i, ParamNode p) {
-    p.isParameterOf(viableCallableLambda(call, _), i)
+  pragma[noinline]
+  private predicate viableParamLambda(DataFlowCall call, ParameterPosition ppos, ParamNode p) {
+    p.isParameterOf(viableCallableLambda(call, _), ppos)
   }
 
   private predicate viableParamArgNonLambda(DataFlowCall call, ParamNode p, ArgNode arg) {
-    exists(int i |
-      viableParamNonLambda(call, i, p) and
-      arg.argumentOf(call, i)
+    exists(ParameterPosition ppos |
+      viableParamNonLambda(call, ppos, p) and
+      argumentPositionMatch(call, arg, ppos)
     )
   }
 
   private predicate viableParamArgLambda(DataFlowCall call, ParamNode p, ArgNode arg) {
-    exists(int i |
-      viableParamLambda(call, i, p) and
-      arg.argumentOf(call, i)
+    exists(ParameterPosition ppos |
+      viableParamLambda(call, ppos, p) and
+      argumentPositionMatch(call, arg, ppos)
     )
   }
 
@@ -322,7 +336,7 @@ private module Cached {
     or
     exists(ArgNode arg |
       result.(PostUpdateNode).getPreUpdateNode() = arg and
-      arg.argumentOf(call, k.(ParamUpdateReturnKind).getPosition())
+      arg.argumentOf(call, k.(ParamUpdateReturnKind).getAMatchingArgumentPosition())
     )
   }
 
@@ -330,7 +344,7 @@ private module Cached {
   predicate returnNodeExt(Node n, ReturnKindExt k) {
     k = TValueReturn(n.(ReturnNode).getKind())
     or
-    exists(ParamNode p, int pos |
+    exists(ParamNode p, ParameterPosition pos |
       parameterValueFlowsToPreUpdate(p, n) and
       p.isParameterOf(_, pos) and
       k = TParamUpdate(pos)
@@ -352,11 +366,13 @@ private module Cached {
   }
 
   cached
-  predicate parameterNode(Node p, DataFlowCallable c, int pos) { isParameterNode(p, c, pos) }
+  predicate parameterNode(Node p, DataFlowCallable c, ParameterPosition pos) {
+    isParameterNode(p, c, pos)
+  }
 
   cached
-  predicate argumentNode(Node n, DataFlowCall call, int pos) {
-    n.(ArgumentNode).argumentOf(call, pos)
+  predicate argumentNode(Node n, DataFlowCall call, ArgumentPosition pos) {
+    isArgumentNode(n, call, pos)
   }
 
   /**
@@ -374,12 +390,12 @@ private module Cached {
   }
 
   /**
-   * Holds if `p` is the `i`th parameter of a viable dispatch target of `call`.
-   * The instance parameter is considered to have index `-1`.
+   * Holds if `p` is the parameter of a viable dispatch target of `call`,
+   * and `p` has position `ppos`.
    */
   pragma[nomagic]
-  private predicate viableParam(DataFlowCall call, int i, ParamNode p) {
-    p.isParameterOf(viableCallableExt(call), i)
+  private predicate viableParam(DataFlowCall call, ParameterPosition ppos, ParamNode p) {
+    p.isParameterOf(viableCallableExt(call), ppos)
   }
 
   /**
@@ -388,9 +404,9 @@ private module Cached {
    */
   cached
   predicate viableParamArg(DataFlowCall call, ParamNode p, ArgNode arg) {
-    exists(int i |
-      viableParam(call, i, p) and
-      arg.argumentOf(call, i) and
+    exists(ParameterPosition ppos |
+      viableParam(call, ppos, p) and
+      argumentPositionMatch(call, arg, ppos) and
       compatibleTypes(getNodeDataFlowType(arg), getNodeDataFlowType(p))
     )
   }
@@ -862,7 +878,7 @@ private module Cached {
   cached
   newtype TReturnKindExt =
     TValueReturn(ReturnKind kind) or
-    TParamUpdate(int pos) { exists(ParamNode p | p.isParameterOf(_, pos)) }
+    TParamUpdate(ParameterPosition pos) { exists(ParamNode p | p.isParameterOf(_, pos)) }
 
   cached
   newtype TBooleanOption =
@@ -1054,9 +1070,9 @@ class ParamNode extends Node {
 
   /**
    * Holds if this node is the parameter of callable `c` at the specified
-   * (zero-based) position.
+   * position.
    */
-  predicate isParameterOf(DataFlowCallable c, int i) { parameterNode(this, c, i) }
+  predicate isParameterOf(DataFlowCallable c, ParameterPosition pos) { parameterNode(this, c, pos) }
 }
 
 /** A data-flow node that represents a call argument. */
@@ -1064,7 +1080,9 @@ class ArgNode extends Node {
   ArgNode() { argumentNode(this, _, _) }
 
   /** Holds if this argument occurs at the given position in the given call. */
-  final predicate argumentOf(DataFlowCall call, int pos) { argumentNode(this, call, pos) }
+  final predicate argumentOf(DataFlowCall call, ArgumentPosition pos) {
+    argumentNode(this, call, pos)
+  }
 }
 
 /**
@@ -1110,11 +1128,14 @@ class ValueReturnKind extends ReturnKindExt, TValueReturn {
 }
 
 class ParamUpdateReturnKind extends ReturnKindExt, TParamUpdate {
-  private int pos;
+  private ParameterPosition pos;
 
   ParamUpdateReturnKind() { this = TParamUpdate(pos) }
 
-  int getPosition() { result = pos }
+  ParameterPosition getPosition() { result = pos }
+
+  pragma[nomagic]
+  ArgumentPosition getAMatchingArgumentPosition() { parameterMatch(pos, result) }
 
   override string toString() { result = "param update " + pos }
 }

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowImplConsistency.qll

@@ -9,6 +9,19 @@ private import tainttracking1.TaintTrackingParameter::Private
 private import tainttracking1.TaintTrackingParameter::Public
 
 module Consistency {
+  private newtype TConsistencyConfiguration = MkConsistencyConfiguration()
+
+  /** A class for configuring the consistency queries. */
+  class ConsistencyConfiguration extends TConsistencyConfiguration {
+    string toString() { none() }
+
+    /** Holds if `n` should be excluded from the consistency test `postWithInFlow`. */
+    predicate postWithInFlowExclude(Node n) { none() }
+
+    /** Holds if `n` should be excluded from the consistency test `argHasPostUpdate`. */
+    predicate argHasPostUpdateExclude(ArgumentNode n) { none() }
+  }
+
   private class RelevantNode extends Node {
     RelevantNode() {
       this instanceof ArgumentNode or
@@ -164,7 +177,7 @@ module Consistency {
 
   query predicate argHasPostUpdate(ArgumentNode n, string msg) {
     not hasPost(n) and
-    not isImmutableOrUnobservable(n) and
+    not any(ConsistencyConfiguration c).argHasPostUpdateExclude(n) and
     msg = "ArgumentNode is missing PostUpdateNode."
   }
 
@@ -177,6 +190,7 @@ module Consistency {
     isPostUpdateNode(n) and
     not clearsContent(n, _) and
     simpleLocalFlowStep(_, n) and
+    not any(ConsistencyConfiguration c).postWithInFlowExclude(n) and
     msg = "PostUpdateNode should not be the target of local flow."
   }
 }

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowPrivate.qll

@@ -2,12 +2,20 @@ private import cpp
 private import DataFlowUtil
 private import semmle.code.cpp.ir.IR
 private import DataFlowDispatch
+private import DataFlowImplConsistency
 
 /** Gets the callable in which this node occurs. */
 DataFlowCallable nodeGetEnclosingCallable(Node n) { result = n.getEnclosingCallable() }
 
 /** Holds if `p` is a `ParameterNode` of `c` with position `pos`. */
-predicate isParameterNode(ParameterNode p, DataFlowCallable c, int pos) { p.isParameterOf(c, pos) }
+predicate isParameterNode(ParameterNode p, DataFlowCallable c, ParameterPosition pos) {
+  p.isParameterOf(c, pos)
+}
+
+/** Holds if `arg` is an `ArgumentNode` of `c` with position `pos`. */
+predicate isArgumentNode(ArgumentNode arg, DataFlowCall c, ArgumentPosition pos) {
+  arg.argumentOf(c, pos)
+}
 
 /**
  * A data flow node that occurs as the argument of a call and is passed as-is
@@ -285,21 +293,18 @@ class Unit extends TUnit {
   string toString() { result = "unit" }
 }
 
-/**
- * Holds if `n` does not require a `PostUpdateNode` as it either cannot be
- * modified or its modification cannot be observed, for example if it is a
- * freshly created object that is not saved in a variable.
- *
- * This predicate is only used for consistency checks.
- */
-predicate isImmutableOrUnobservable(Node n) {
-  // The rules for whether an IR argument gets a post-update node are too
-  // complex to model here.
-  any()
-}
-
 /** Holds if `n` should be hidden from path explanations. */
-predicate nodeIsHidden(Node n) { n instanceof OperandNode and not n instanceof ArgumentNode }
+predicate nodeIsHidden(Node n) {
+  n instanceof OperandNode and not n instanceof ArgumentNode
+  or
+  StoreNodeFlow::flowThrough(n, _) and
+  not StoreNodeFlow::flowOutOf(n, _) and
+  not StoreNodeFlow::flowInto(_, n)
+  or
+  ReadNodeFlow::flowThrough(n, _) and
+  not ReadNodeFlow::flowOutOf(n, _) and
+  not ReadNodeFlow::flowInto(_, n)
+}
 
 class LambdaCallKind = Unit;
 
@@ -320,3 +325,11 @@ predicate additionalLambdaFlowStep(Node nodeFrom, Node nodeTo, boolean preserves
  * by default as a heuristic.
  */
 predicate allowParameterReturnInSelf(ParameterNode p) { none() }
+
+private class MyConsistencyConfiguration extends Consistency::ConsistencyConfiguration {
+  override predicate argHasPostUpdateExclude(ArgumentNode n) {
+    // The rules for whether an IR argument gets a post-update node are too
+    // complex to model here.
+    any()
+  }
+}

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowUtil.qll

@@ -452,7 +452,7 @@ class SsaPhiNode extends Node, TSsaPhiNode {
 
   /** Holds if this phi node has input from the `rnk`'th write operation in block `block`. */
   final predicate hasInputAtRankInBlock(IRBlock block, int rnk) {
-    hasInputAtRankInBlock(block, rnk, _)
+    this.hasInputAtRankInBlock(block, rnk, _)
   }
 
   /**
@@ -806,7 +806,7 @@ predicate simpleLocalFlowStep(Node nodeFrom, Node nodeTo) {
   simpleOperandLocalFlowStep(nodeFrom.asInstruction(), nodeTo.asOperand())
   or
   // Flow into, through, and out of store nodes
-  StoreNodeFlow::flowInto(nodeFrom, nodeTo)
+  StoreNodeFlow::flowInto(nodeFrom.asInstruction(), nodeTo)
   or
   StoreNodeFlow::flowThrough(nodeFrom, nodeTo)
   or
@@ -831,23 +831,19 @@ private predicate adjacentDefUseFlow(Node nodeFrom, Node nodeTo) {
     //Def-use flow
     Ssa::ssaFlow(nodeFrom, nodeTo)
     or
-    exists(Instruction loadAddress | loadAddress = Ssa::getSourceAddressFromNode(nodeFrom) |
-      // Use-use flow through reads
-      exists(Node address |
-        Ssa::addressFlowTC(address.asInstruction(), loadAddress) and
-        Ssa::ssaFlow(address, nodeTo)
-      )
-      or
-      // Use-use flow through stores.
-      exists(Node store |
-        Ssa::explicitWrite(_, store.asInstruction(), loadAddress) and
-        Ssa::ssaFlow(store, nodeTo)
-      )
+    // Use-use flow through stores.
+    exists(Instruction loadAddress, Node store |
+      loadAddress = Ssa::getSourceAddressFromNode(nodeFrom) and
+      Ssa::explicitWrite(_, store.asInstruction(), loadAddress) and
+      Ssa::ssaFlow(store, nodeTo)
     )
   )
 }
 
-private module ReadNodeFlow {
+/**
+ * INTERNAL: Do not use.
+ */
+module ReadNodeFlow {
   /** Holds if the read node `nodeTo` should receive flow from `nodeFrom`. */
   predicate flowInto(Node nodeFrom, ReadNode nodeTo) {
     nodeTo.isInitial() and
@@ -867,7 +863,12 @@ private module ReadNodeFlow {
     )
   }
 
-  /** Holds if the read node `nodeTo` should receive flow from the read node `nodeFrom`. */
+  /**
+   * Holds if the read node `nodeTo` should receive flow from the read node `nodeFrom`.
+   *
+   * This happens when `readFrom` is _not_ the source of a `readStep`, and `nodeTo` is
+   * the `ReadNode` that represents an address that directly depends on `nodeFrom`.
+   */
   predicate flowThrough(ReadNode nodeFrom, ReadNode nodeTo) {
     not readStep(nodeFrom, _, _) and
     nodeFrom.getOuter() = nodeTo
@@ -906,17 +907,25 @@ private module ReadNodeFlow {
   }
 }
 
-private module StoreNodeFlow {
+/**
+ * INTERNAL: Do not use.
+ */
+module StoreNodeFlow {
   /** Holds if the store node `nodeTo` should receive flow from `nodeFrom`. */
-  predicate flowInto(Node nodeFrom, StoreNode nodeTo) {
-    nodeTo.flowInto(Ssa::getDestinationAddress(nodeFrom.asInstruction()))
+  predicate flowInto(Instruction instrFrom, StoreNode nodeTo) {
+    nodeTo.flowInto(Ssa::getDestinationAddress(instrFrom))
   }
 
-  /** Holds if the store node `nodeTo` should receive flow from `nodeFom`. */
-  predicate flowThrough(StoreNode nFrom, StoreNode nodeTo) {
+  /**
+   * Holds if the store node `nodeTo` should receive flow from `nodeFom`.
+   *
+   * This happens when `nodeFrom` is _not_ the source of a `storeStep`, and `nodeFrom` is
+   * the `Storenode` that represents an address that directly depends on `nodeTo`.
+   */
+  predicate flowThrough(StoreNode nodeFrom, StoreNode nodeTo) {
     // Flow through a post update node that doesn't need a store step.
-    not storeStep(nFrom, _, _) and
-    nodeTo.getOuter() = nFrom
+    not storeStep(nodeFrom, _, _) and
+    nodeTo.getOuter() = nodeFrom
   }
 
   /**

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/SsaImplCommon.qll

@@ -634,3 +634,29 @@ class UncertainWriteDefinition extends WriteDefinition {
     )
   }
 }
+
+/** Provides a set of consistency queries. */
+module Consistency {
+  abstract class RelevantDefinition extends Definition {
+    abstract predicate hasLocationInfo(
+      string filepath, int startline, int startcolumn, int endline, int endcolumn
+    );
+  }
+
+  query predicate nonUniqueDef(RelevantDefinition def, SourceVariable v, BasicBlock bb, int i) {
+    ssaDefReachesRead(v, def, bb, i) and
+    not exists(unique(Definition def0 | ssaDefReachesRead(v, def0, bb, i)))
+  }
+
+  query predicate readWithoutDef(SourceVariable v, BasicBlock bb, int i) {
+    variableRead(bb, i, v, _) and
+    not ssaDefReachesRead(v, _, bb, i)
+  }
+
+  query predicate deadDef(RelevantDefinition def, SourceVariable v) {
+    v = def.getSourceVariable() and
+    not ssaDefReachesRead(_, def, _, _) and
+    not phiHasInputFromBlock(_, def, _) and
+    not uncertainWriteDefinitionInput(_, def)
+  }
+}

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/SsaInternals.qll

@@ -244,17 +244,6 @@ Instruction getDestinationAddress(Instruction instr) {
     ]
 }
 
-class ReferenceToInstruction extends CopyValueInstruction {
-  ReferenceToInstruction() {
-    this.getResultType() instanceof Cpp::ReferenceType and
-    not this.getUnary().getResultType() instanceof Cpp::ReferenceType
-  }
-
-  Instruction getSourceAddress() { result = getSourceAddressOperand().getDef() }
-
-  Operand getSourceAddressOperand() { result = this.getUnaryOperand() }
-}
-
 /** Gets the source address of `instr` if it is an instruction that behaves like a `LoadInstruction`. */
 Instruction getSourceAddress(Instruction instr) { result = getSourceAddressOperand(instr).getDef() }
 
@@ -266,11 +255,7 @@ Operand getSourceAddressOperand(Instruction instr) {
   result =
     [
       instr.(LoadInstruction).getSourceAddressOperand(),
-      instr.(ReadSideEffectInstruction).getArgumentOperand(),
-      // `ReferenceToInstruction` is really more of an address-of operation,
-      // but by including it in this list we break out of `flowOutOfAddressStep` at an
-      // instruction that, at the source level, looks like a use of a variable.
-      instr.(ReferenceToInstruction).getSourceAddressOperand()
+      instr.(ReadSideEffectInstruction).getArgumentOperand()
     ]
 }
 
@@ -295,10 +280,6 @@ Operand getSourceValueOperand(Instruction instr) {
   result = instr.(LoadInstruction).getSourceValueOperand()
   or
   result = instr.(ReadSideEffectInstruction).getSideEffectOperand()
-  or
-  // See the comment on the `ReferenceToInstruction` disjunct in `getSourceAddressOperand` for why
-  // this case is included.
-  result = instr.(ReferenceToInstruction).getSourceValueOperand()
 }
 
 /**
@@ -513,6 +494,64 @@ private module Cached {
       explicitWrite(false, storeNode.getStoreInstruction(), def)
     )
     or
+    // The destination of a store operation has undergone lvalue-to-rvalue conversion and is now a
+    // right-hand-side of a store operation.
+    // Find the next use of the variable in that store operation, and recursively find the load of that
+    // pointer. For example, consider this case:
+    //
+    // ```cpp
+    // int x = source();
+    // int* p = &x;
+    // sink(*p);
+    // ```
+    //
+    // if we want to find the load of the address of `x`, we see that the pointer is stored into `p`,
+    // and we then need to recursively look for the load of `p`.
+    exists(
+      Def def, StoreInstruction store, IRBlock block1, int rnk1, Use use, IRBlock block2, int rnk2
+    |
+      store = def.getInstruction() and
+      store.getSourceValueOperand() = operand and
+      def.hasRankInBlock(block1, rnk1) and
+      use.hasRankInBlock(block2, rnk2) and
+      adjacentDefRead(_, block1, rnk1, block2, rnk2)
+    |
+      // The shared SSA library has determined that `use` is the next use of the operand
+      // so we find the next load of that use (but only if there is no `PostUpdateNode`) we
+      // need to flow into first.
+      not StoreNodeFlow::flowInto(store, _) and
+      flowOutOfAddressStep(use.getOperand(), nodeTo)
+      or
+      // It may also be the case that `store` gives rise to another store step. So let's make sure that
+      // we also take those into account.
+      StoreNodeFlow::flowInto(store, nodeTo)
+    )
+    or
+    // As we find the next load of an address, we might come across another use of the same variable.
+    // In that case, we recursively find the next use of _that_ operand, and continue searching for
+    // the next load of that operand. For example, consider this case:
+    //
+    // ```cpp
+    // int x = source();
+    // use(&x);
+    // int* p = &x;
+    // sink(*p);
+    // ```
+    //
+    // The next use of `x` after its definition is `use(&x)`, but there is a later load of the address
+    // of `x` that we want to flow to. So we use the shared SSA library to find the next load.
+    not operand = getSourceAddressOperand(_) and
+    exists(Use use1, Use use2, IRBlock block1, int rnk1, IRBlock block2, int rnk2 |
+      use1.getOperand() = operand and
+      use1.hasRankInBlock(block1, rnk1) and
+      // Don't flow to the next use if this use is part of a store operation that totally
+      // overrides a variable.
+      not explicitWrite(true, _, use1.getOperand().getDef()) and
+      adjacentDefRead(_, block1, rnk1, block2, rnk2) and
+      use2.hasRankInBlock(block2, rnk2) and
+      flowOutOfAddressStep(use2.getOperand(), nodeTo)
+    )
+    or
     operand = getSourceAddressOperand(nodeTo.asInstruction())
     or
     exists(ReturnIndirectionInstruction ret |

cpp/ql/lib/semmle/code/cpp/ir/implementation/aliased_ssa/Operand.qll

@@ -20,6 +20,14 @@ private import internal.OperandInternal
 private class TStageOperand =
   TRegisterOperand or TNonSSAMemoryOperand or TPhiOperand or TChiOperand;
 
+/**
+ * A known location. Testing `loc instanceof KnownLocation` will account for non existing locations, as
+ * opposed to testing `not loc isntanceof UnknownLocation`
+ */
+private class KnownLocation extends Language::Location {
+  KnownLocation() { not this instanceof Language::UnknownLocation }
+}
+
 /**
  * An operand of an `Instruction`. The operand represents a use of the result of one instruction
  * (the defining instruction) in another instruction (the use instruction)
@@ -45,8 +53,10 @@ class Operand extends TStageOperand {
 
   /**
    * Gets the location of the source code for this operand.
+   * By default this is where the operand is used, but some subclasses may override this
+   * using `getAnyDef()` if it makes more sense.
    */
-  final Language::Location getLocation() { result = this.getUse().getLocation() }
+  Language::Location getLocation() { result = this.getUse().getLocation() }
 
   /**
    * Gets the function that contains this operand.
@@ -269,6 +279,10 @@ class RegisterOperand extends NonPhiOperand, TRegisterOperand {
 
   final override string toString() { result = tag.toString() }
 
+  // most `RegisterOperands` have a more meaningful location at the definition
+  // the only exception are specific cases of `ThisArgumentOperand`
+  override Language::Location getLocation() { result = this.getAnyDef().getLocation() }
+
   final override Instruction getAnyDef() { result = defInstr }
 
   final override Overlap getDefinitionOverlap() {
@@ -293,7 +307,7 @@ class NonPhiMemoryOperand extends NonPhiOperand, MemoryOperand, TNonPhiMemoryOpe
   final override string toString() { result = tag.toString() }
 
   final override Instruction getAnyDef() {
-    result = unique(Instruction defInstr | hasDefinition(defInstr, _))
+    result = unique(Instruction defInstr | this.hasDefinition(defInstr, _))
   }
 
   final override Overlap getDefinitionOverlap() { this.hasDefinition(_, result) }
@@ -401,11 +415,19 @@ class ArgumentOperand extends RegisterOperand {
 }
 
 /**
- * An operand representing the implicit 'this' argument to a member function
+ * An operand representing the implicit `this` argument to a member function
  * call.
  */
 class ThisArgumentOperand extends ArgumentOperand {
   override ThisArgumentOperandTag tag;
+
+  // in most cases the def location makes more sense, but in some corner cases it
+  // has an unknown location: in those cases we fall back to the use location
+  override Language::Location getLocation() {
+    if this.getAnyDef().getLocation() instanceof KnownLocation
+    then result = this.getAnyDef().getLocation()
+    else result = this.getUse().getLocation()
+  }
 }
 
 /**

cpp/ql/lib/semmle/code/cpp/ir/implementation/raw/Operand.qll

@@ -20,6 +20,14 @@ private import internal.OperandInternal
 private class TStageOperand =
   TRegisterOperand or TNonSSAMemoryOperand or TPhiOperand or TChiOperand;
 
+/**
+ * A known location. Testing `loc instanceof KnownLocation` will account for non existing locations, as
+ * opposed to testing `not loc isntanceof UnknownLocation`
+ */
+private class KnownLocation extends Language::Location {
+  KnownLocation() { not this instanceof Language::UnknownLocation }
+}
+
 /**
  * An operand of an `Instruction`. The operand represents a use of the result of one instruction
  * (the defining instruction) in another instruction (the use instruction)
@@ -45,8 +53,10 @@ class Operand extends TStageOperand {
 
   /**
    * Gets the location of the source code for this operand.
+   * By default this is where the operand is used, but some subclasses may override this
+   * using `getAnyDef()` if it makes more sense.
    */
-  final Language::Location getLocation() { result = this.getUse().getLocation() }
+  Language::Location getLocation() { result = this.getUse().getLocation() }
 
   /**
    * Gets the function that contains this operand.
@@ -269,6 +279,10 @@ class RegisterOperand extends NonPhiOperand, TRegisterOperand {
 
   final override string toString() { result = tag.toString() }
 
+  // most `RegisterOperands` have a more meaningful location at the definition
+  // the only exception are specific cases of `ThisArgumentOperand`
+  override Language::Location getLocation() { result = this.getAnyDef().getLocation() }
+
   final override Instruction getAnyDef() { result = defInstr }
 
   final override Overlap getDefinitionOverlap() {
@@ -293,7 +307,7 @@ class NonPhiMemoryOperand extends NonPhiOperand, MemoryOperand, TNonPhiMemoryOpe
   final override string toString() { result = tag.toString() }
 
   final override Instruction getAnyDef() {
-    result = unique(Instruction defInstr | hasDefinition(defInstr, _))
+    result = unique(Instruction defInstr | this.hasDefinition(defInstr, _))
   }
 
   final override Overlap getDefinitionOverlap() { this.hasDefinition(_, result) }
@@ -401,11 +415,19 @@ class ArgumentOperand extends RegisterOperand {
 }
 
 /**
- * An operand representing the implicit 'this' argument to a member function
+ * An operand representing the implicit `this` argument to a member function
  * call.
  */
 class ThisArgumentOperand extends ArgumentOperand {
   override ThisArgumentOperandTag tag;
+
+  // in most cases the def location makes more sense, but in some corner cases it
+  // has an unknown location: in those cases we fall back to the use location
+  override Language::Location getLocation() {
+    if this.getAnyDef().getLocation() instanceof KnownLocation
+    then result = this.getAnyDef().getLocation()
+    else result = this.getUse().getLocation()
+  }
 }
 
 /**

cpp/ql/lib/semmle/code/cpp/ir/implementation/unaliased_ssa/Operand.qll

@@ -20,6 +20,14 @@ private import internal.OperandInternal
 private class TStageOperand =
   TRegisterOperand or TNonSSAMemoryOperand or TPhiOperand or TChiOperand;
 
+/**
+ * A known location. Testing `loc instanceof KnownLocation` will account for non existing locations, as
+ * opposed to testing `not loc isntanceof UnknownLocation`
+ */
+private class KnownLocation extends Language::Location {
+  KnownLocation() { not this instanceof Language::UnknownLocation }
+}
+
 /**
  * An operand of an `Instruction`. The operand represents a use of the result of one instruction
  * (the defining instruction) in another instruction (the use instruction)
@@ -45,8 +53,10 @@ class Operand extends TStageOperand {
 
   /**
    * Gets the location of the source code for this operand.
+   * By default this is where the operand is used, but some subclasses may override this
+   * using `getAnyDef()` if it makes more sense.
    */
-  final Language::Location getLocation() { result = this.getUse().getLocation() }
+  Language::Location getLocation() { result = this.getUse().getLocation() }
 
   /**
    * Gets the function that contains this operand.
@@ -269,6 +279,10 @@ class RegisterOperand extends NonPhiOperand, TRegisterOperand {
 
   final override string toString() { result = tag.toString() }
 
+  // most `RegisterOperands` have a more meaningful location at the definition
+  // the only exception are specific cases of `ThisArgumentOperand`
+  override Language::Location getLocation() { result = this.getAnyDef().getLocation() }
+
   final override Instruction getAnyDef() { result = defInstr }
 
   final override Overlap getDefinitionOverlap() {
@@ -293,7 +307,7 @@ class NonPhiMemoryOperand extends NonPhiOperand, MemoryOperand, TNonPhiMemoryOpe
   final override string toString() { result = tag.toString() }
 
   final override Instruction getAnyDef() {
-    result = unique(Instruction defInstr | hasDefinition(defInstr, _))
+    result = unique(Instruction defInstr | this.hasDefinition(defInstr, _))
   }
 
   final override Overlap getDefinitionOverlap() { this.hasDefinition(_, result) }
@@ -401,11 +415,19 @@ class ArgumentOperand extends RegisterOperand {
 }
 
 /**
- * An operand representing the implicit 'this' argument to a member function
+ * An operand representing the implicit `this` argument to a member function
  * call.
  */
 class ThisArgumentOperand extends ArgumentOperand {
   override ThisArgumentOperandTag tag;
+
+  // in most cases the def location makes more sense, but in some corner cases it
+  // has an unknown location: in those cases we fall back to the use location
+  override Language::Location getLocation() {
+    if this.getAnyDef().getLocation() instanceof KnownLocation
+    then result = this.getAnyDef().getLocation()
+    else result = this.getUse().getLocation()
+  }
 }
 
 /**

cpp/ql/lib/semmle/code/cpp/models/implementations/Iterator.qll

@@ -34,6 +34,16 @@ private class IteratorByTraits extends Iterator {
   IteratorByTraits() { exists(IteratorTraits it | it.getIteratorType() = this) }
 }
 
+/**
+ * The C++ standard includes an `std::iterator_traits` specialization for pointer types. When
+ * this specialization is included in the database, a pointer type `T*` will be an instance
+ * of the `IteratorByTraits` class. However, if the `T*` specialization is not in the database,
+ * we need to explicitly include them with this class.
+ */
+private class IteratorByPointer extends Iterator instanceof PointerType {
+  IteratorByPointer() { not this instanceof IteratorByTraits }
+}
+
 /**
  * A type which has the typedefs expected for an iterator.
  */

cpp/ql/lib/semmle/code/cpp/security/BufferWrite.qll

@@ -71,13 +71,30 @@ abstract class BufferWrite extends Expr {
    */
   int getMaxData() { none() }
 
+  /**
+   * Gets an upper bound to the amount of data that's being written (if one
+   * can be found), specifying the reason for the estimation.
+   */
+  int getMaxData(BufferWriteEstimationReason reason) {
+    reason instanceof NoSpecifiedEstimateReason and result = getMaxData()
+  }
+
   /**
    * Gets an upper bound to the amount of data that's being written (if one
    * can be found), except that float to string conversions are assumed to be
    * much smaller (8 bytes) than their true maximum length.  This can be
    * helpful in determining the cause of a buffer overflow issue.
    */
-  int getMaxDataLimited() { result = this.getMaxData() }
+  int getMaxDataLimited() { result = getMaxData() }
+
+  /**
+   * Gets an upper bound to the amount of data that's being written (if one
+   * can be found), specifying the reason for the estimation, except that
+   * float to string conversions are assumed to be much smaller (8 bytes)
+   * than their true maximum length.  This can be helpful in determining the
+   * cause of a buffer overflow issue.
+   */
+  int getMaxDataLimited(BufferWriteEstimationReason reason) { result = getMaxData(reason) }
 
   /**
    * Gets the size of a single character of the type this
@@ -135,10 +152,16 @@ class StrCopyBW extends BufferWriteCall {
     result = this.getArgument(this.getParamSize()).getValue().toInt() * this.getCharSize()
   }
 
-  override int getMaxData() {
+  private int getMaxDataImpl(BufferWriteEstimationReason reason) {
+    // when result exists, it is an exact flow analysis
+    reason instanceof ValueFlowAnalysis and
     result =
       this.getArgument(this.getParamSrc()).(AnalysedString).getMaxLength() * this.getCharSize()
   }
+
+  override int getMaxData(BufferWriteEstimationReason reason) { result = getMaxDataImpl(reason) }
+
+  override int getMaxData() { result = max(getMaxDataImpl(_)) }
 }
 
 /**
@@ -173,10 +196,16 @@ class StrCatBW extends BufferWriteCall {
     result = this.getArgument(this.getParamSize()).getValue().toInt() * this.getCharSize()
   }
 
-  override int getMaxData() {
+  private int getMaxDataImpl(BufferWriteEstimationReason reason) {
+    // when result exists, it is an exact flow analysis
+    reason instanceof ValueFlowAnalysis and
     result =
       this.getArgument(this.getParamSrc()).(AnalysedString).getMaxLength() * this.getCharSize()
   }
+
+  override int getMaxData(BufferWriteEstimationReason reason) { result = getMaxDataImpl(reason) }
+
+  override int getMaxData() { result = max(getMaxDataImpl(_)) }
 }
 
 /**
@@ -233,19 +262,29 @@ class SprintfBW extends BufferWriteCall {
 
   override Expr getDest() { result = this.getArgument(f.getOutputParameterIndex(false)) }
 
-  override int getMaxData() {
+  private int getMaxDataImpl(BufferWriteEstimationReason reason) {
     exists(FormatLiteral fl |
       fl = this.(FormattingFunctionCall).getFormat() and
-      result = fl.getMaxConvertedLength() * this.getCharSize()
+      result = fl.getMaxConvertedLengthWithReason(reason) * this.getCharSize()
     )
   }
 
-  override int getMaxDataLimited() {
+  override int getMaxData(BufferWriteEstimationReason reason) { result = getMaxDataImpl(reason) }
+
+  override int getMaxData() { result = max(getMaxDataImpl(_)) }
+
+  private int getMaxDataLimitedImpl(BufferWriteEstimationReason reason) {
     exists(FormatLiteral fl |
       fl = this.(FormattingFunctionCall).getFormat() and
-      result = fl.getMaxConvertedLengthLimited() * this.getCharSize()
+      result = fl.getMaxConvertedLengthLimitedWithReason(reason) * this.getCharSize()
     )
   }
+
+  override int getMaxDataLimited(BufferWriteEstimationReason reason) {
+    result = getMaxDataLimitedImpl(reason)
+  }
+
+  override int getMaxDataLimited() { result = max(getMaxDataLimitedImpl(_)) }
 }
 
 /**
@@ -336,19 +375,29 @@ class SnprintfBW extends BufferWriteCall {
     result = this.getArgument(this.getParamSize()).getValue().toInt() * this.getCharSize()
   }
 
-  override int getMaxData() {
+  private int getMaxDataImpl(BufferWriteEstimationReason reason) {
     exists(FormatLiteral fl |
       fl = this.(FormattingFunctionCall).getFormat() and
-      result = fl.getMaxConvertedLength() * this.getCharSize()
+      result = fl.getMaxConvertedLengthWithReason(reason) * this.getCharSize()
     )
   }
 
-  override int getMaxDataLimited() {
+  override int getMaxData(BufferWriteEstimationReason reason) { result = getMaxDataImpl(reason) }
+
+  override int getMaxData() { result = max(getMaxDataImpl(_)) }
+
+  private int getMaxDataLimitedImpl(BufferWriteEstimationReason reason) {
     exists(FormatLiteral fl |
       fl = this.(FormattingFunctionCall).getFormat() and
-      result = fl.getMaxConvertedLengthLimited() * this.getCharSize()
+      result = fl.getMaxConvertedLengthLimitedWithReason(reason) * this.getCharSize()
     )
   }
+
+  override int getMaxDataLimited(BufferWriteEstimationReason reason) {
+    result = getMaxDataLimitedImpl(reason)
+  }
+
+  override int getMaxDataLimited() { result = max(getMaxDataLimitedImpl(_)) }
 }
 
 /**
@@ -436,7 +485,9 @@ class ScanfBW extends BufferWrite {
 
   override Expr getDest() { result = this }
 
-  override int getMaxData() {
+  private int getMaxDataImpl(BufferWriteEstimationReason reason) {
+    // when this returns, it is based on exact flow analysis
+    reason instanceof ValueFlowAnalysis and
     exists(ScanfFunctionCall fc, ScanfFormatLiteral fl, int arg |
       this = fc.getArgument(arg) and
       fl = fc.getFormat() and
@@ -444,6 +495,10 @@ class ScanfBW extends BufferWrite {
     )
   }
 
+  override int getMaxData(BufferWriteEstimationReason reason) { result = getMaxDataImpl(reason) }
+
+  override int getMaxData() { result = max(getMaxDataImpl(_)) }
+
   override string getBWDesc() {
     exists(FunctionCall fc |
       this = fc.getArgument(_) and
@@ -474,8 +529,14 @@ class RealpathBW extends BufferWriteCall {
 
   override Expr getASource() { result = this.getArgument(0) }
 
-  override int getMaxData() {
+  private int getMaxDataImpl(BufferWriteEstimationReason reason) {
+    // although there may be some unknown invariants guaranteeing that a real path is shorter than PATH_MAX, we can consider providing less than PATH_MAX a problem with high precision
+    reason instanceof ValueFlowAnalysis and
     result = path_max() and
     this = this // Suppress a compiler warning
   }
+
+  override int getMaxData(BufferWriteEstimationReason reason) { result = getMaxDataImpl(reason) }
+
+  override int getMaxData() { result = max(getMaxDataImpl(_)) }
 }

cpp/ql/src/AlertSuppression.ql

@@ -18,12 +18,12 @@ class SuppressionComment extends Comment {
     (
       this instanceof CppStyleComment and
       // strip the beginning slashes
-      text = getContents().suffix(2)
+      text = this.getContents().suffix(2)
       or
       this instanceof CStyleComment and
       // strip both the beginning /* and the end */ the comment
       exists(string text0 |
-        text0 = getContents().suffix(2) and
+        text0 = this.getContents().suffix(2) and
         text = text0.prefix(text0.length() - 2)
       ) and
       // The /* */ comment must be a single-line comment

cpp/ql/src/Architecture/Refactoring Opportunities/ClassesWithManyFields.ql

@@ -153,12 +153,12 @@ class ExtClass extends Class {
   }
 
   predicate hasLocationInfo(string path, int startline, int startcol, int endline, int endcol) {
-    if hasOneVariableGroup()
+    if this.hasOneVariableGroup()
     then
       exists(VariableDeclarationGroup vdg | vdg.getClass() = this |
         vdg.hasLocationInfo(path, startline, startcol, endline, endcol)
       )
-    else getLocation().hasLocationInfo(path, startline, startcol, endline, endcol)
+    else this.getLocation().hasLocationInfo(path, startline, startcol, endline, endcol)
   }
 }
 

cpp/ql/src/Best Practices/Unused Entities/UnusedStaticFunctions.ql

@@ -50,6 +50,16 @@ predicate reachableThing(Thing t) {
   exists(Thing mid | reachableThing(mid) and mid.callsOrAccesses() = t)
 }
 
+pragma[nomagic]
+predicate callsOrAccessesPlus(Thing thing1, FunctionToRemove thing2) {
+  thing1.callsOrAccesses() = thing2
+  or
+  exists(Thing mid |
+    thing1.callsOrAccesses() = mid and
+    callsOrAccessesPlus(mid, thing2)
+  )
+}
+
 class Thing extends Locatable {
   Thing() {
     this instanceof Function or
@@ -81,7 +91,7 @@ class FunctionToRemove extends Function {
   }
 
   Thing getOther() {
-    result.callsOrAccesses+() = this and
+    callsOrAccessesPlus(result, this) and
     this != result and
     // We will already be reporting the enclosing function of a
     // local variable, so don't also report the variable

cpp/ql/src/CHANGELOG.md

@@ -0,0 +1,5 @@
+## 0.0.4
+
+### New Queries
+
+* A new query `cpp/non-https-url` has been added for C/C++. The query flags uses of `http` URLs that might be better replaced with `https`.

cpp/ql/src/Critical/OverflowStatic.ql

@@ -103,9 +103,9 @@ class CallWithBufferSize extends FunctionCall {
     // `upperBound(e)` defaults to `exprMaxVal(e)` when `e` isn't analyzable. So to get a meaningful
     // result in this case we pick the minimum value obtainable from dataflow and range analysis.
     result =
-      upperBound(statedSizeExpr())
+      upperBound(this.statedSizeExpr())
           .minimum(min(Expr statedSizeSrc |
-              DataFlow::localExprFlow(statedSizeSrc, statedSizeExpr())
+              DataFlow::localExprFlow(statedSizeSrc, this.statedSizeExpr())
             |
               statedSizeSrc.getValue().toInt()
             ))

cpp/ql/src/JPL_C/LOC-2/Rule 09/Semaphores.qll

@@ -22,7 +22,7 @@ abstract class LockOperation extends FunctionCall {
   ControlFlowNode getAReachedNode() {
     result = this
     or
-    exists(ControlFlowNode mid | mid = getAReachedNode() |
+    exists(ControlFlowNode mid | mid = this.getAReachedNode() |
       not mid != this.getMatchingUnlock() and
       result = mid.getASuccessor()
     )

cpp/ql/src/Likely Bugs/Leap Year/LeapYear.qll

@@ -156,8 +156,8 @@ abstract class LeapYearFieldAccess extends YearFieldAccess {
     //
     // https://aa.usno.navy.mil/faq/docs/calendars.php
     this.isUsedInMod4Operation() and
-    additionalModulusCheckForLeapYear(400) and
-    additionalModulusCheckForLeapYear(100)
+    this.additionalModulusCheckForLeapYear(400) and
+    this.additionalModulusCheckForLeapYear(100)
   }
 }
 
@@ -176,17 +176,17 @@ class StructTmLeapYearFieldAccess extends LeapYearFieldAccess {
 
   override predicate isUsedInCorrectLeapYearCheck() {
     this.isUsedInMod4Operation() and
-    additionalModulusCheckForLeapYear(400) and
-    additionalModulusCheckForLeapYear(100) and
+    this.additionalModulusCheckForLeapYear(400) and
+    this.additionalModulusCheckForLeapYear(100) and
     // tm_year represents years since 1900
     (
-      additionalAdditionOrSubstractionCheckForLeapYear(1900)
+      this.additionalAdditionOrSubstractionCheckForLeapYear(1900)
       or
       // some systems may use 2000 for 2-digit year conversions
-      additionalAdditionOrSubstractionCheckForLeapYear(2000)
+      this.additionalAdditionOrSubstractionCheckForLeapYear(2000)
       or
       // converting from/to Unix epoch
-      additionalAdditionOrSubstractionCheckForLeapYear(1970)
+      this.additionalAdditionOrSubstractionCheckForLeapYear(1970)
     )
   }
 }

cpp/ql/src/Likely Bugs/Memory Management/AllocaInLoop.ql

@@ -57,7 +57,7 @@ class LoopWithAlloca extends Stmt {
     or
     // `e == 0`
     exists(EQExpr eq |
-      conditionRequires(eq, truth.booleanNot()) and
+      this.conditionRequires(eq, truth.booleanNot()) and
       eq.getAnOperand().getValue().toInt() = 0 and
       e = eq.getAnOperand() and
       not exists(e.getValue())
@@ -65,7 +65,7 @@ class LoopWithAlloca extends Stmt {
     or
     // `e != 0`
     exists(NEExpr eq |
-      conditionRequires(eq, truth) and
+      this.conditionRequires(eq, truth) and
       eq.getAnOperand().getValue().toInt() = 0 and
       e = eq.getAnOperand() and
       not exists(e.getValue())
@@ -73,7 +73,7 @@ class LoopWithAlloca extends Stmt {
     or
     // `(bool)e == true`
     exists(EQExpr eq |
-      conditionRequires(eq, truth) and
+      this.conditionRequires(eq, truth) and
       eq.getAnOperand().getValue().toInt() = 1 and
       e = eq.getAnOperand() and
       e.getUnspecifiedType() instanceof BoolType and
@@ -82,7 +82,7 @@ class LoopWithAlloca extends Stmt {
     or
     // `(bool)e != true`
     exists(NEExpr eq |
-      conditionRequires(eq, truth.booleanNot()) and
+      this.conditionRequires(eq, truth.booleanNot()) and
       eq.getAnOperand().getValue().toInt() = 1 and
       e = eq.getAnOperand() and
       e.getUnspecifiedType() instanceof BoolType and
@@ -90,7 +90,7 @@ class LoopWithAlloca extends Stmt {
     )
     or
     exists(NotExpr notExpr |
-      conditionRequires(notExpr, truth.booleanNot()) and
+      this.conditionRequires(notExpr, truth.booleanNot()) and
       e = notExpr.getOperand()
     )
     or
@@ -98,7 +98,7 @@ class LoopWithAlloca extends Stmt {
     // requires both of its operand to be true as well.
     exists(LogicalAndExpr andExpr |
       truth = true and
-      conditionRequires(andExpr, truth) and
+      this.conditionRequires(andExpr, truth) and
       e = andExpr.getAnOperand()
     )
     or
@@ -106,7 +106,7 @@ class LoopWithAlloca extends Stmt {
     // it requires both of its operand to be false as well.
     exists(LogicalOrExpr orExpr |
       truth = false and
-      conditionRequires(orExpr, truth) and
+      this.conditionRequires(orExpr, truth) and
       e = orExpr.getAnOperand()
     )
   }
@@ -141,9 +141,9 @@ class LoopWithAlloca extends Stmt {
    * `conditionRequiresInequality`.
    */
   private Variable getAControllingVariable() {
-    conditionRequires(result.getAnAccess(), _)
+    this.conditionRequires(result.getAnAccess(), _)
     or
-    conditionRequiresInequality(result.getAnAccess(), _, _)
+    this.conditionRequiresInequality(result.getAnAccess(), _, _)
   }
 
   /**

cpp/ql/src/Likely Bugs/Memory Management/NtohlArrayNoBound.qll

@@ -61,72 +61,72 @@ class PointerArithmeticAccess extends BufferAccess, Expr {
  * A pair of buffer accesses through a call to memcpy.
  */
 class MemCpy extends BufferAccess, FunctionCall {
-  MemCpy() { getTarget().hasName("memcpy") }
+  MemCpy() { this.getTarget().hasName("memcpy") }
 
   override Expr getPointer() {
-    result = getArgument(0) or
-    result = getArgument(1)
+    result = this.getArgument(0) or
+    result = this.getArgument(1)
   }
 
-  override Expr getAccessedLength() { result = getArgument(2) }
+  override Expr getAccessedLength() { result = this.getArgument(2) }
 }
 
 class StrncpySizeExpr extends BufferAccess, FunctionCall {
-  StrncpySizeExpr() { getTarget().hasName("strncpy") }
+  StrncpySizeExpr() { this.getTarget().hasName("strncpy") }
 
   override Expr getPointer() {
-    result = getArgument(0) or
-    result = getArgument(1)
+    result = this.getArgument(0) or
+    result = this.getArgument(1)
   }
 
-  override Expr getAccessedLength() { result = getArgument(2) }
+  override Expr getAccessedLength() { result = this.getArgument(2) }
 }
 
 class RecvSizeExpr extends BufferAccess, FunctionCall {
-  RecvSizeExpr() { getTarget().hasName("recv") }
+  RecvSizeExpr() { this.getTarget().hasName("recv") }
 
-  override Expr getPointer() { result = getArgument(1) }
+  override Expr getPointer() { result = this.getArgument(1) }
 
-  override Expr getAccessedLength() { result = getArgument(2) }
+  override Expr getAccessedLength() { result = this.getArgument(2) }
 }
 
 class SendSizeExpr extends BufferAccess, FunctionCall {
-  SendSizeExpr() { getTarget().hasName("send") }
+  SendSizeExpr() { this.getTarget().hasName("send") }
 
-  override Expr getPointer() { result = getArgument(1) }
+  override Expr getPointer() { result = this.getArgument(1) }
 
-  override Expr getAccessedLength() { result = getArgument(2) }
+  override Expr getAccessedLength() { result = this.getArgument(2) }
 }
 
 class SnprintfSizeExpr extends BufferAccess, FunctionCall {
-  SnprintfSizeExpr() { getTarget().hasName("snprintf") }
+  SnprintfSizeExpr() { this.getTarget().hasName("snprintf") }
 
-  override Expr getPointer() { result = getArgument(0) }
+  override Expr getPointer() { result = this.getArgument(0) }
 
-  override Expr getAccessedLength() { result = getArgument(1) }
+  override Expr getAccessedLength() { result = this.getArgument(1) }
 }
 
 class MemcmpSizeExpr extends BufferAccess, FunctionCall {
-  MemcmpSizeExpr() { getTarget().hasName("Memcmp") }
+  MemcmpSizeExpr() { this.getTarget().hasName("Memcmp") }
 
   override Expr getPointer() {
-    result = getArgument(0) or
-    result = getArgument(1)
+    result = this.getArgument(0) or
+    result = this.getArgument(1)
   }
 
-  override Expr getAccessedLength() { result = getArgument(2) }
+  override Expr getAccessedLength() { result = this.getArgument(2) }
 }
 
 class MallocSizeExpr extends BufferAccess, FunctionCall {
-  MallocSizeExpr() { getTarget().hasName("malloc") }
+  MallocSizeExpr() { this.getTarget().hasName("malloc") }
 
   override Expr getPointer() { none() }
 
-  override Expr getAccessedLength() { result = getArgument(0) }
+  override Expr getAccessedLength() { result = this.getArgument(0) }
 }
 
 class NetworkFunctionCall extends FunctionCall {
-  NetworkFunctionCall() { getTarget().hasName(["ntohd", "ntohf", "ntohl", "ntohll", "ntohs"]) }
+  NetworkFunctionCall() { this.getTarget().hasName(["ntohd", "ntohf", "ntohl", "ntohll", "ntohs"]) }
 }
 
 class NetworkToBufferSizeConfiguration extends DataFlow::Configuration {

cpp/ql/src/Likely Bugs/Protocols/TlsSettingsMisconfiguration.ql

@@ -3,8 +3,10 @@
  * @description Using the TLS or SSLv23 protocol from the boost::asio library, but not disabling deprecated protocols, or disabling minimum-recommended protocols.
  * @kind problem
  * @problem.severity error
+ * @security-severity 7.5
  * @id cpp/boost/tls-settings-misconfiguration
  * @tags security
+ *       external/cwe/cwe-326
  */
 
 import cpp

cpp/ql/src/Likely Bugs/Protocols/UseOfDeprecatedHardcodedProtocol.ql

@@ -3,8 +3,10 @@
  * @description Using a deprecated hard-coded protocol using the boost::asio library.
  * @kind problem
  * @problem.severity error
+ * @security-severity 7.5
  * @id cpp/boost/use-of-deprecated-hardcoded-security-protocol
  * @tags security
+ *       external/cwe/cwe-327
  */
 
 import cpp

cpp/ql/src/Power of 10/Rule 4/FunctionTooLong.ql

@@ -13,7 +13,7 @@ import cpp
 
 class MacroFunctionCall extends MacroInvocation {
   MacroFunctionCall() {
-    not exists(getParentInvocation()) and
+    not exists(this.getParentInvocation()) and
     this.getMacro().getHead().matches("%(%")
   }
 

cpp/ql/src/Power of 10/Rule 5/AssertionDensity.ql

@@ -13,7 +13,7 @@ import semmle.code.cpp.commons.Assertions
 
 class MacroFunctionCall extends MacroInvocation {
   MacroFunctionCall() {
-    not exists(getParentInvocation()) and
+    not exists(this.getParentInvocation()) and
     this.getMacro().getHead().matches("%(%")
   }
 

cpp/ql/src/Security/CWE/CWE-020/ExternalAPIsSpecific.qll

@@ -38,7 +38,7 @@ class ExternalAPIDataNode extends DataFlow::Node {
   int getIndex() { result = i }
 
   /** Gets the description of the function being called. */
-  string getFunctionDescription() { result = getExternalFunction().toString() }
+  string getFunctionDescription() { result = this.getExternalFunction().toString() }
 }
 
 /** A configuration for tracking flow from `RemoteFlowSource`s to `ExternalAPIDataNode`s. */

cpp/ql/src/Security/CWE/CWE-020/ir/ExternalAPIsSpecific.qll

@@ -38,7 +38,7 @@ class ExternalAPIDataNode extends DataFlow::Node {
   int getIndex() { result = i }
 
   /** Gets the description of the function being called. */
-  string getFunctionDescription() { result = getExternalFunction().toString() }
+  string getFunctionDescription() { result = this.getExternalFunction().toString() }
 }
 
 /** A configuration for tracking flow from `RemoteFlowSource`s to `ExternalAPIDataNode`s. */

cpp/ql/src/Security/CWE/CWE-120/OverrunWrite.ql

@@ -21,14 +21,15 @@ import semmle.code.cpp.commons.Alloc
  * See CWE-120/UnboundedWrite.ql for a summary of CWE-120 alert cases.
  */
 
-from BufferWrite bw, Expr dest, int destSize
+from BufferWrite bw, Expr dest, int destSize, int estimated
 where
   not bw.hasExplicitLimit() and // has no explicit size limit
   dest = bw.getDest() and
   destSize = getBufferSize(dest, _) and
+  estimated = bw.getMaxDataLimited(_) and
   // we can deduce that too much data may be copied (even without
   // long '%f' conversions)
-  bw.getMaxDataLimited() > destSize
+  estimated > destSize
 select bw,
-  "This '" + bw.getBWDesc() + "' operation requires " + bw.getMaxData() +
+  "This '" + bw.getBWDesc() + "' operation requires " + estimated +
     " bytes but the destination is only " + destSize + " bytes."

cpp/ql/src/Security/CWE/CWE-120/OverrunWriteFloat.ql

@@ -21,14 +21,15 @@ import semmle.code.cpp.security.BufferWrite
  * See CWE-120/UnboundedWrite.ql for a summary of CWE-120 alert cases.
  */
 
-from BufferWrite bw, int destSize
+from BufferWrite bw, int destSize, int estimated, BufferWriteEstimationReason reason
 where
   not bw.hasExplicitLimit() and
   // has no explicit size limit
   destSize = getBufferSize(bw.getDest(), _) and
-  bw.getMaxData() > destSize and
+  estimated = bw.getMaxData(reason) and
+  estimated > destSize and
   // and we can deduce that too much data may be copied
-  bw.getMaxDataLimited() <= destSize // but it would fit without long '%f' conversions
+  bw.getMaxDataLimited(reason) <= destSize // but it would fit without long '%f' conversions
 select bw,
-  "This '" + bw.getBWDesc() + "' operation may require " + bw.getMaxData() +
+  "This '" + bw.getBWDesc() + "' operation may require " + estimated +
     " bytes because of float conversions, but the target is only " + destSize + " bytes."

cpp/ql/src/Security/CWE/CWE-120/UnboundedWrite.ql

@@ -44,7 +44,7 @@ import TaintedWithPath
 
 predicate isUnboundedWrite(BufferWrite bw) {
   not bw.hasExplicitLimit() and // has no explicit size limit
-  not exists(bw.getMaxData()) // and we can't deduce an upper bound to the amount copied
+  not exists(bw.getMaxData(_)) // and we can't deduce an upper bound to the amount copied
 }
 
 /*

cpp/ql/src/Security/CWE/CWE-121/UnterminatedVarargsCall.ql

@@ -42,7 +42,7 @@ class VarargsFunction extends Function {
   }
 
   private int trailingArgValueCount(string value) {
-    result = strictcount(FunctionCall fc | trailingArgValue(fc) = value)
+    result = strictcount(FunctionCall fc | this.trailingArgValue(fc) = value)
   }
 
   string nonTrailingVarArgValue(FunctionCall fc, int index) {
@@ -58,11 +58,11 @@ class VarargsFunction extends Function {
 
   string normalTerminator(int cnt) {
     result = ["0", "-1"] and
-    cnt = trailingArgValueCount(result) and
-    2 * cnt > totalCount() and
+    cnt = this.trailingArgValueCount(result) and
+    2 * cnt > this.totalCount() and
     not exists(FunctionCall fc, int index |
       // terminator value is used in a non-terminating position
-      nonTrailingVarArgValue(fc, index) = result
+      this.nonTrailingVarArgValue(fc, index) = result
     )
   }
 

cpp/ql/src/Security/CWE/CWE-170/ImproperNullTerminationTainted.ql

@@ -42,7 +42,7 @@ class TaintSource extends VariableAccess {
     definitionUsePair(_, this, va)
     or
     exists(VariableAccess mid, Expr def |
-      sourceReaches(mid) and
+      this.sourceReaches(mid) and
       exprDefinition(_, def, mid) and
       definitionUsePair(_, def, va)
     )
@@ -53,11 +53,11 @@ class TaintSource extends VariableAccess {
    * from `va`, possibly using intermediate reassignments.
    */
   private predicate reachesSink(VariableAccess va, VariableAccess sink) {
-    isSink(sink) and
+    this.isSink(sink) and
     va = sink
     or
     exists(VariableAccess mid, Expr def |
-      reachesSink(mid, sink) and
+      this.reachesSink(mid, sink) and
       exprDefinition(_, def, va) and
       definitionUsePair(_, def, mid)
     )
@@ -71,15 +71,15 @@ class TaintSource extends VariableAccess {
    * this source to `sink` found via `tainted(source, sink)`.)
    */
   predicate reaches(VariableAccess sink) {
-    isSink(sink) and
+    this.isSink(sink) and
     not exists(VariableAccess va |
       va != this and
       va != sink and
       mayAddNullTerminator(_, va)
     |
-      sourceReaches(va)
+      this.sourceReaches(va)
       or
-      reachesSink(va, sink)
+      this.reachesSink(va, sink)
     )
   }
 }

cpp/ql/src/Security/CWE/CWE-295/SSLResultConflation.qhelp

@@ -0,0 +1,28 @@
+<!DOCTYPE qhelp PUBLIC
+  "-//Semmle//qhelp//EN"
+  "qhelp.dtd">
+<qhelp>
+<overview>
+<p>When checking the result of SSL certificate verification, accepting any error code may allow an attacker to impersonate someone who is trusted.</p>
+
+</overview>
+<recommendation>
+
+<p>When checking an SSL certificate with <code>SSL_get_verify_result</code>, only <code>X509_V_OK</code> is a success code. If there is any other result the certificate should not be accepted.</p>
+
+</recommendation>
+<example>
+
+<p>In this example the error code <code>X509_V_ERR_CERT_HAS_EXPIRED</code> is treated the same as an OK result. An expired certificate should not be accepted as it is more likely to be compromised than a valid certificate.</p>
+
+<sample src="SSLResultConflationBad.cpp" />
+
+<p>In the corrected example, only a result of <code>X509_V_OK</code> is accepted.</p>
+
+<sample src="SSLResultConflationGood.cpp" />
+
+</example>
+<references>
+
+</references>
+</qhelp>

cpp/ql/src/Security/CWE/CWE-295/SSLResultConflation.ql

@@ -0,0 +1,50 @@
+/**
+ * @name Certificate result conflation
+ * @description Only accept SSL certificates that pass certificate verification.
+ * @kind problem
+ * @problem.severity error
+ * @security-severity 7.5
+ * @precision medium
+ * @id cpp/certificate-result-conflation
+ * @tags security
+ *       external/cwe/cwe-295
+ */
+
+import cpp
+import semmle.code.cpp.controlflow.Guards
+import semmle.code.cpp.dataflow.DataFlow
+
+/**
+ * A call to `SSL_get_verify_result`.
+ */
+class SSLGetVerifyResultCall extends FunctionCall {
+  SSLGetVerifyResultCall() { getTarget().getName() = "SSL_get_verify_result" }
+}
+
+/**
+ * Data flow from a call to `SSL_get_verify_result` to a guard condition
+ * that references the result.
+ */
+class VerifyResultConfig extends DataFlow::Configuration {
+  VerifyResultConfig() { this = "VerifyResultConfig" }
+
+  override predicate isSource(DataFlow::Node source) {
+    source.asExpr() instanceof SSLGetVerifyResultCall
+  }
+
+  override predicate isSink(DataFlow::Node sink) {
+    exists(GuardCondition guard | guard.getAChild*() = sink.asExpr())
+  }
+}
+
+from
+  VerifyResultConfig config, DataFlow::Node source, DataFlow::Node sink1, DataFlow::Node sink2,
+  GuardCondition guard, Expr c1, Expr c2, boolean testIsTrue
+where
+  config.hasFlow(source, sink1) and
+  config.hasFlow(source, sink2) and
+  guard.comparesEq(sink1.asExpr(), c1, 0, false, testIsTrue) and // (value != c1) => testIsTrue
+  guard.comparesEq(sink2.asExpr(), c2, 0, false, testIsTrue) and // (value != c2) => testIsTrue
+  c1.getValue().toInt() = 0 and
+  c2.getValue().toInt() != 0
+select guard, "This expression conflates OK and non-OK results from $@.", source, source.toString()

cpp/ql/src/Security/CWE/CWE-295/SSLResultConflationBad.cpp

@@ -0,0 +1,13 @@
+// ...
+
+if (cert = SSL_get_peer_certificate(ssl))
+{
+	result = SSL_get_verify_result(ssl);
+
+	if ((result == X509_V_OK) || (result == X509_V_ERR_CERT_HAS_EXPIRED)) // BAD (conflates OK and a non-OK codes)
+	{
+		do_ok();
+	} else {
+		do_error();
+	}
+}

cpp/ql/src/Security/CWE/CWE-295/SSLResultConflationGood.cpp

@@ -0,0 +1,13 @@
+// ...
+
+if (cert = SSL_get_peer_certificate(ssl))
+{
+	result = SSL_get_verify_result(ssl);
+
+	if (result == X509_V_OK) // GOOD
+	{
+		do_ok();
+	} else {
+		do_error();
+	}
+}

cpp/ql/src/Security/CWE/CWE-295/SSLResultNotChecked.qhelp

@@ -0,0 +1,28 @@
+<!DOCTYPE qhelp PUBLIC
+  "-//Semmle//qhelp//EN"
+  "qhelp.dtd">
+<qhelp>
+<overview>
+<p>After fetching an SSL certificate, always check the result of certificate verification.</p>
+
+</overview>
+<recommendation>
+
+<p>Always check the result of SSL certificate verification. A certificate that has been revoked may indicate that data is coming from an attacker, whereas a certificate that has expired or was self-signed may indicate an increased likelihood that the data is malicious.</p>
+
+</recommendation>
+<example>
+
+<p>In this example, the <code>SSL_get_peer_certificate</code> function is used to get the certificate of a peer. However it is unsafe to use that information without checking if the certificate is valid.</p>
+
+<sample src="SSLResultNotCheckedBad.cpp" />
+
+<p>In the corrected example, we use <code>SSL_get_verify_result</code> to check that certificate verification was successful.</p>
+
+<sample src="SSLResultNotCheckedGood.cpp" />
+
+</example>
+<references>
+
+</references>
+</qhelp>

cpp/ql/src/Security/CWE/CWE-295/SSLResultNotChecked.ql

@@ -0,0 +1,120 @@
+/**
+ * @name Certificate not checked
+ * @description Always check the result of certificate verification after fetching an SSL certificate.
+ * @kind problem
+ * @problem.severity error
+ * @security-severity 7.5
+ * @precision medium
+ * @id cpp/certificate-not-checked
+ * @tags security
+ *       external/cwe/cwe-295
+ */
+
+import cpp
+import semmle.code.cpp.valuenumbering.GlobalValueNumbering
+import semmle.code.cpp.controlflow.IRGuards
+
+/**
+ * A call to `SSL_get_peer_certificate`.
+ */
+class SSLGetPeerCertificateCall extends FunctionCall {
+  SSLGetPeerCertificateCall() {
+    getTarget().getName() = "SSL_get_peer_certificate" // SSL_get_peer_certificate(ssl)
+  }
+
+  Expr getSSLArgument() { result = getArgument(0) }
+}
+
+/**
+ * A call to `SSL_get_verify_result`.
+ */
+class SSLGetVerifyResultCall extends FunctionCall {
+  SSLGetVerifyResultCall() {
+    getTarget().getName() = "SSL_get_verify_result" // SSL_get_peer_certificate(ssl)
+  }
+
+  Expr getSSLArgument() { result = getArgument(0) }
+}
+
+/**
+ * Holds if the SSL object passed into `SSL_get_peer_certificate` is checked with
+ * `SSL_get_verify_result` entering `node`.
+ */
+predicate resultIsChecked(SSLGetPeerCertificateCall getCertCall, ControlFlowNode node) {
+  exists(Expr ssl, SSLGetVerifyResultCall check |
+    ssl = globalValueNumber(getCertCall.getSSLArgument()).getAnExpr() and
+    ssl = check.getSSLArgument() and
+    node = check
+  )
+}
+
+/**
+ * Holds if the certificate returned by `SSL_get_peer_certificate` is found to be
+ * `0` on the edge `node1` to `node2`.
+ */
+predicate certIsZero(
+  SSLGetPeerCertificateCall getCertCall, ControlFlowNode node1, ControlFlowNode node2
+) {
+  exists(Expr cert | cert = globalValueNumber(getCertCall).getAnExpr() |
+    exists(GuardCondition guard, Expr zero |
+      zero.getValue().toInt() = 0 and
+      node1 = guard and
+      (
+        // if (cert == zero) {
+        guard.comparesEq(cert, zero, 0, true, true) and
+        node2 = guard.getATrueSuccessor()
+        or
+        // if (cert != zero) { }
+        guard.comparesEq(cert, zero, 0, false, true) and
+        node2 = guard.getAFalseSuccessor()
+      )
+    )
+    or
+    (
+      // if (cert) { }
+      node1 = cert
+      or
+      // if (!cert) {
+      node1.(NotExpr).getAChild() = cert
+    ) and
+    node2 = node1.getASuccessor() and
+    not cert.(GuardCondition).controls(node2, true) // cert may be false
+  )
+}
+
+/**
+ * Holds if the SSL object passed into `SSL_get_peer_certificate` has not been checked with
+ * `SSL_get_verify_result` at `node`. Note that this is only computed at the call to
+ * `SSL_get_peer_certificate` and at the start and end of `BasicBlock`s.
+ */
+predicate certNotChecked(SSLGetPeerCertificateCall getCertCall, ControlFlowNode node) {
+  // cert is not checked at the call to `SSL_get_peer_certificate`
+  node = getCertCall
+  or
+  exists(BasicBlock bb, int pos |
+    // flow to end of a `BasicBlock`
+    certNotChecked(getCertCall, bb.getNode(pos)) and
+    node = bb.getEnd() and
+    // check for barrier node
+    not exists(int pos2 |
+      pos2 > pos and
+      resultIsChecked(getCertCall, bb.getNode(pos2))
+    )
+  )
+  or
+  exists(BasicBlock pred, BasicBlock bb |
+    // flow from the end of one `BasicBlock` to the beginning of a successor
+    certNotChecked(getCertCall, pred.getEnd()) and
+    bb = pred.getASuccessor() and
+    node = bb.getStart() and
+    // check for barrier bb
+    not certIsZero(getCertCall, pred.getEnd(), bb.getStart())
+  )
+}
+
+from SSLGetPeerCertificateCall getCertCall, ControlFlowNode node
+where
+  certNotChecked(getCertCall, node) and
+  node instanceof Function // (function exit)
+select getCertCall,
+  "This " + getCertCall.toString() + " is not followed by a call to SSL_get_verify_result."

cpp/ql/src/Security/CWE/CWE-295/SSLResultNotCheckedBad.cpp

@@ -0,0 +1,5 @@
+// ...
+
+X509 *cert = SSL_get_peer_certificate(ssl); // BAD (SSL_get_verify_result is never called)
+
+// ...

cpp/ql/src/Security/CWE/CWE-295/SSLResultNotCheckedGood.cpp

@@ -0,0 +1,9 @@
+// ...
+
+X509 *cert = SSL_get_peer_certificate(ssl); // GOOD
+if (cert)
+{
+	result = SSL_get_verify_result(ssl);
+	if (result == X509_V_OK)
+	{
+		// ...

cpp/ql/src/Security/CWE/CWE-311/CleartextFileWrite.ql

@@ -8,6 +8,7 @@
  * @precision high
  * @id cpp/cleartext-storage-file
  * @tags security
+ *       external/cwe/cwe-260
  *       external/cwe/cwe-313
  */
 

cpp/ql/src/Security/CWE/CWE-313/CleartextSqliteDatabase.ql

@@ -29,7 +29,7 @@ class SqliteFunctionCall extends FunctionCall {
 }
 
 predicate sqlite_encryption_used() {
-  any(StringLiteral l).getValue().toLowerCase().regexpMatch("pragma key.*") or
+  any(StringLiteral l).getValue().toLowerCase().matches("pragma key%") or
   any(StringLiteral l).getValue().toLowerCase().matches("%attach%database%key%") or
   any(FunctionCall fc).getTarget().getName().matches("sqlite%\\_key\\_%")
 }

cpp/ql/src/Security/CWE/CWE-319/UseOfHttp.ql

@@ -7,6 +7,7 @@
  * @id cpp/non-https-url
  * @tags security
  *       external/cwe/cwe-319
+ *       external/cwe/cwe-345
  */
 
 import cpp
@@ -61,7 +62,11 @@ class HttpStringToUrlOpenConfig extends TaintTracking::Configuration {
     // accessed as a URL, for example using it in a network access. Some
     // URLs are only ever displayed or used for data processing.
     exists(FunctionCall fc |
-      fc.getTarget().hasGlobalOrStdName(["system", "gethostbyname", "getaddrinfo"]) and
+      fc.getTarget()
+          .hasGlobalOrStdName([
+              "system", "gethostbyname", "gethostbyname2", "gethostbyname_r", "getaddrinfo",
+              "X509_load_http", "X509_CRL_load_http"
+            ]) and
       sink.asExpr() = fc.getArgument(0)
       or
       fc.getTarget().hasGlobalOrStdName(["send", "URLDownloadToFile", "URLDownloadToCacheFile"]) and

cpp/ql/src/Security/CWE/CWE-457/InitializationFunctions.qll

@@ -84,8 +84,8 @@ class ParameterNullCheck extends ParameterCheck {
     p.getFunction() instanceof InitializationFunction and
     p.getType().getUnspecifiedType() instanceof PointerType and
     exists(VariableAccess va | va = p.getAnAccess() |
-      nullSuccessor = getATrueSuccessor() and
-      notNullSuccessor = getAFalseSuccessor() and
+      nullSuccessor = this.getATrueSuccessor() and
+      notNullSuccessor = this.getAFalseSuccessor() and
       (
         va = this.(NotExpr).getOperand() or
         va = any(EQExpr eq | eq = this and eq.getAnOperand().getValue() = "0").getAnOperand() or
@@ -95,8 +95,8 @@ class ParameterNullCheck extends ParameterCheck {
               .getAnOperand()
       )
       or
-      nullSuccessor = getAFalseSuccessor() and
-      notNullSuccessor = getATrueSuccessor() and
+      nullSuccessor = this.getAFalseSuccessor() and
+      notNullSuccessor = this.getATrueSuccessor() and
       (
         va = this or
         va = any(NEExpr eq | eq = this and eq.getAnOperand().getValue() = "0").getAnOperand() or
@@ -132,7 +132,7 @@ class ValidatedExternalCondInitFunction extends ExternalData {
   ValidatedExternalCondInitFunction() { this.getDataPath().matches("%cond-init%.csv") }
 
   predicate isExternallyVerified(Function f, int param) {
-    functionSignature(f, getField(1), getField(2)) and param = getFieldAsInt(3)
+    functionSignature(f, this.getField(1), this.getField(2)) and param = this.getFieldAsInt(3)
   }
 }
 
@@ -193,7 +193,7 @@ class InitializationFunction extends Function {
             .getAnOverridingFunction+()
             .(InitializationFunction)
             .initializedParameter() or
-      getParameter(i) = any(InitializationFunctionCall c).getAnInitParameter()
+      this.getParameter(i) = any(InitializationFunctionCall c).getAnInitParameter()
     )
     or
     // If we have no definition, we look at SAL annotations
@@ -227,7 +227,7 @@ class InitializationFunction extends Function {
         result = getAnInitializedArgument(any(Call c))
         or
         exists(IfStmt check | result = check.getCondition().getAChild*() |
-          paramReassignmentCondition(check)
+          this.paramReassignmentCondition(check)
         )
       )
       or
@@ -249,15 +249,15 @@ class InitializationFunction extends Function {
 
   /** Holds if `n` can be reached without the parameter at `index` being reassigned. */
   predicate paramNotReassignedAt(ControlFlowNode n, int index, Context c) {
-    c = getAContext(index) and
+    c = this.getAContext(index) and
     (
       not exists(this.getEntryPoint()) and index = i and n = this
       or
       n = this.getEntryPoint() and index = i
       or
-      exists(ControlFlowNode mid | paramNotReassignedAt(mid, index, c) |
+      exists(ControlFlowNode mid | this.paramNotReassignedAt(mid, index, c) |
         n = mid.getASuccessor() and
-        not n = paramReassignment(index) and
+        not n = this.paramReassignment(index) and
         /*
          * Ignore successor edges where the parameter is null, because it is then confirmed to be
          * initialized.
@@ -265,7 +265,7 @@ class InitializationFunction extends Function {
 
         not exists(ParameterNullCheck nullCheck |
           nullCheck = mid and
-          nullCheck = getANullCheck(index) and
+          nullCheck = this.getANullCheck(index) and
           n = nullCheck.getNullSuccessor()
         ) and
         /*
@@ -281,13 +281,13 @@ class InitializationFunction extends Function {
 
   /** Gets a null-check on the parameter at `index`. */
   private ParameterNullCheck getANullCheck(int index) {
-    getParameter(index) = result.getParameter()
+    this.getParameter(index) = result.getParameter()
   }
 
   /** Gets a parameter which is not at the given index. */
   private Parameter getOtherParameter(int index) {
     index = i and
-    result = getAParameter() and
+    result = this.getAParameter() and
     not result.getIndex() = index
   }
 
@@ -306,10 +306,10 @@ class InitializationFunction extends Function {
     if
       strictcount(Parameter p |
         exists(Context c | c = ParamNull(p) or c = ParamNotNull(p)) and
-        p = getOtherParameter(index)
+        p = this.getOtherParameter(index)
       ) = 1
     then
-      exists(Parameter p | p = getOtherParameter(index) |
+      exists(Parameter p | p = this.getOtherParameter(index) |
         result = ParamNull(p) or result = ParamNotNull(p)
       )
     else
@@ -424,8 +424,8 @@ class ConditionalInitializationCall extends FunctionCall {
 
   /** Gets the argument passed for the given parameter to this call. */
   Expr getArgumentForParameter(Parameter p) {
-    p = getTarget().getAParameter() and
-    result = getArgument(p.getIndex())
+    p = this.getTarget().getAParameter() and
+    result = this.getArgument(p.getIndex())
   }
 
   /**
@@ -442,7 +442,7 @@ class ConditionalInitializationCall extends FunctionCall {
         context = ParamNotNull(otherP) or
         context = ParamNull(otherP)
       |
-        otherArg = getArgumentForParameter(otherP) and
+        otherArg = this.getArgumentForParameter(otherP) and
         (otherArg instanceof AddressOfExpr implies context = ParamNotNull(otherP)) and
         (otherArg.getType() instanceof ArrayType implies context = ParamNotNull(otherP)) and
         (otherArg.getValue() = "0" implies context = ParamNull(otherP))
@@ -511,8 +511,8 @@ class ConditionalInitializationCall extends FunctionCall {
         )
     )
     or
-    exists(ControlFlowNode mid | mid = uncheckedReaches(var) |
-      not mid = getStatusVariable().getAnAccess() and
+    exists(ControlFlowNode mid | mid = this.uncheckedReaches(var) |
+      not mid = this.getStatusVariable().getAnAccess() and
       not mid = var.getAnAccess() and
       not exists(VariableAccess write | result = write and write = var.getAnAccess() |
         write = any(AssignExpr a).getLValue() or

cpp/ql/src/Security/CWE/CWE-457/UninitializedVariables.qll

@@ -44,7 +44,7 @@ class ConditionallyInitializedVariable extends LocalVariable {
     // Find a call that conditionally initializes this variable
     hasConditionalInitialization(f, call, this, initAccess, e) and
     // Ignore cases where the variable is assigned prior to the call
-    not reaches(getAnAssignedValue(), initAccess) and
+    not reaches(this.getAnAssignedValue(), initAccess) and
     // Ignore cases where the variable is assigned field-wise prior to the call.
     not exists(FieldAccess fa |
       exists(Assignment a |
@@ -56,7 +56,7 @@ class ConditionallyInitializedVariable extends LocalVariable {
     ) and
     // Ignore cases where the variable is assigned by a prior call to an initialization function
     not exists(Call c |
-      getAnAccess() = getAnInitializedArgument(c).(AddressOfExpr).getOperand() and
+      this.getAnAccess() = getAnInitializedArgument(c).(AddressOfExpr).getOperand() and
       reaches(c, initAccess)
     ) and
     /*
@@ -64,7 +64,7 @@ class ConditionallyInitializedVariable extends LocalVariable {
      * the CFG, but should always be considered as initialized, so exclude them.
      */
 
-    not exists(getInitializer().getExpr())
+    not exists(this.getInitializer().getExpr())
   }
 
   /**
@@ -90,7 +90,7 @@ class ConditionallyInitializedVariable extends LocalVariable {
     // Variable associated with this particular call
     call = initializingCall and
     // Access is a meaningful read access
-    result = getAReadAccess() and
+    result = this.getAReadAccess() and
     // Which occurs after the call
     reaches(call, result) and
     /*
@@ -124,7 +124,7 @@ class ConditionallyInitializedVariable extends LocalVariable {
     call = initializingCall and
     initializingFunction = f and
     e = evidence and
-    result = getAReadAccessAfterCall(initializingCall) and
+    result = this.getAReadAccessAfterCall(initializingCall) and
     (
       // Access is risky because status return code ignored completely
       call instanceof ExprInVoidContext
@@ -148,7 +148,7 @@ class ConditionallyInitializedVariable extends LocalVariable {
     call = initializingCall and
     initializingFunction = f and
     e = evidence and
-    result = getAReadAccessAfterCall(initializingCall) and
+    result = this.getAReadAccessAfterCall(initializingCall) and
     exists(LocalVariable status, Assignment a |
       a.getRValue() = call and
       call = status.getAnAssignedValue() and
@@ -184,7 +184,7 @@ class ConditionallyInitializedVariable extends LocalVariable {
     ConditionalInitializationFunction initializingFunction,
     ConditionalInitializationCall initializingCall, Evidence evidence
   ) {
-    result = getARiskyAccessBeforeStatusCheck(initializingFunction, initializingCall, evidence) or
-    result = getARiskyAccessWithNoStatusCheck(initializingFunction, initializingCall, evidence)
+    result = this.getARiskyAccessBeforeStatusCheck(initializingFunction, initializingCall, evidence) or
+    result = this.getARiskyAccessWithNoStatusCheck(initializingFunction, initializingCall, evidence)
   }
 }

cpp/ql/src/Security/CWE/CWE-497/ExposedSystemData.ql

@@ -31,15 +31,15 @@ abstract class SystemData extends Element {
    */
   Expr getAnExprIndirect() {
     // direct SystemData
-    result = getAnExpr() or
+    result = this.getAnExpr() or
     // flow via global or member variable (conservative approximation)
-    result = getAnAffectedVar().getAnAccess() or
+    result = this.getAnAffectedVar().getAnAccess() or
     // flow via stack variable
-    definitionUsePair(_, getAnExprIndirect(), result) or
-    useUsePair(_, getAnExprIndirect(), result) or
-    useUsePair(_, result, getAnExprIndirect()) or
+    definitionUsePair(_, this.getAnExprIndirect(), result) or
+    useUsePair(_, this.getAnExprIndirect(), result) or
+    useUsePair(_, result, this.getAnExprIndirect()) or
     // flow from assigned value to assignment expression
-    result.(AssignExpr).getRValue() = getAnExprIndirect()
+    result.(AssignExpr).getRValue() = this.getAnExprIndirect()
   }
 
   /**

cpp/ql/src/Security/CWE/CWE-676/DangerousUseOfCin.ql

@@ -67,16 +67,16 @@ class IFStream extends Type {
  */
 class CinVariable extends NamespaceVariable {
   CinVariable() {
-    getName() = ["cin", "wcin"] and
-    getNamespace().getName() = "std"
+    this.getName() = ["cin", "wcin"] and
+    this.getNamespace().getName() = "std"
   }
 }
 
 /** A call to `std::operator>>`. */
 class OperatorRShiftCall extends FunctionCall {
   OperatorRShiftCall() {
-    getTarget().getNamespace().getName() = "std" and
-    getTarget().hasName("operator>>")
+    this.getTarget().getNamespace().getName() = "std" and
+    this.getTarget().hasName("operator>>")
   }
 
   /*
@@ -87,15 +87,15 @@ class OperatorRShiftCall extends FunctionCall {
    */
 
   Expr getSource() {
-    if getTarget() instanceof MemberFunction
-    then result = getQualifier()
-    else result = getArgument(0)
+    if this.getTarget() instanceof MemberFunction
+    then result = this.getQualifier()
+    else result = this.getArgument(0)
   }
 
   Expr getDest() {
-    if getTarget() instanceof MemberFunction
-    then result = getArgument(0)
-    else result = getArgument(1)
+    if this.getTarget() instanceof MemberFunction
+    then result = this.getArgument(0)
+    else result = this.getArgument(1)
   }
 }
 
@@ -119,7 +119,7 @@ abstract class PotentiallyDangerousInput extends Expr {
    * Gets the width restriction that applies to the input stream
    * for this expression, if any.
    */
-  Expr getWidth() { result = getPreviousAccess().getWidthAfter() }
+  Expr getWidth() { result = this.getPreviousAccess().getWidthAfter() }
 
   private Expr getWidthSetHere() {
     exists(FunctionCall widthCall |
@@ -154,11 +154,11 @@ abstract class PotentiallyDangerousInput extends Expr {
    * after this expression, if any.
    */
   Expr getWidthAfter() {
-    result = getWidthSetHere()
+    result = this.getWidthSetHere()
     or
-    not exists(getWidthSetHere()) and
-    not isWidthConsumedHere() and
-    result = getWidth()
+    not exists(this.getWidthSetHere()) and
+    not this.isWidthConsumedHere() and
+    result = this.getWidth()
   }
 }
 

cpp/ql/src/change-notes/released/0.0.4.md

@@ -0,0 +1,5 @@
+## 0.0.4
+
+### New Queries
+
+* A new query `cpp/non-https-url` has been added for C/C++. The query flags uses of `http` URLs that might be better replaced with `https`.

cpp/ql/src/codeql-pack.release.yml

@@ -0,0 +1,2 @@
+---
+lastReleaseVersion: 0.0.4

cpp/ql/src/experimental/Security/CWE/CWE-273/PrivilegeDroppingOutoforder.ql

@@ -21,9 +21,9 @@ predicate argumentMayBeRoot(Expr e) {
 
 class SetuidLikeFunctionCall extends FunctionCall {
   SetuidLikeFunctionCall() {
-    (getTarget().hasGlobalName("setuid") or getTarget().hasGlobalName("setresuid")) and
+    (this.getTarget().hasGlobalName("setuid") or this.getTarget().hasGlobalName("setresuid")) and
     // setuid/setresuid with the root user are false positives.
-    not argumentMayBeRoot(getArgument(0))
+    not argumentMayBeRoot(this.getArgument(0))
   }
 }
 
@@ -44,7 +44,7 @@ class SetuidLikeWrapperCall extends FunctionCall {
 
 class CallBeforeSetuidFunctionCall extends FunctionCall {
   CallBeforeSetuidFunctionCall() {
-    getTarget()
+    this.getTarget()
         .hasGlobalName([
             "setgid", "setresgid",
             // Compatibility may require skipping initgroups and setgroups return checks.
@@ -52,7 +52,7 @@ class CallBeforeSetuidFunctionCall extends FunctionCall {
             "initgroups", "setgroups"
           ]) and
     // setgid/setresgid/etc with the root group are false positives.
-    not argumentMayBeRoot(getArgument(0))
+    not argumentMayBeRoot(this.getArgument(0))
   }
 }
 

cpp/ql/src/experimental/Security/CWE/CWE-401/MemoryLeakOnFailedCallToRealloc.ql

@@ -24,7 +24,7 @@ class CallMayNotReturn extends FunctionCall {
     not exists(this.(ControlFlowNode).getASuccessor())
     or
     // call to another function that may not return
-    exists(CallMayNotReturn exit | getTarget() = exit.getEnclosingFunction())
+    exists(CallMayNotReturn exit | this.getTarget() = exit.getEnclosingFunction())
   }
 }
 

cpp/ql/src/experimental/Security/CWE/CWE-703/FindIncorrectlyUsedExceptions.ql

@@ -38,13 +38,7 @@ where
     fc.getTargetType().(Class).getABaseClass+().hasGlobalOrStdName("exception") or
     fc.getTargetType().(Class).getABaseClass+().hasGlobalOrStdName("CException")
   ) and
+  fc instanceof ExprInVoidContext and
   not fc.isInMacroExpansion() and
-  not exists(ThrowExpr texp | fc.getEnclosingStmt() = texp.getEnclosingStmt()) and
-  not exists(FunctionCall fctmp | fctmp.getAnArgument() = fc) and
-  not fc instanceof ConstructorDirectInit and
-  not fc.getEnclosingStmt() instanceof DeclStmt and
-  not fc instanceof ConstructorDelegationInit and
-  not fc.getParent() instanceof Initializer and
-  not fc.getParent() instanceof AllocationExpr and
-  msg = "This object does not generate an exception."
+  msg = "Object creation of exception type on stack. Did you forget the throw keyword?"
 select fc, msg

cpp/ql/src/jsf/4.10 Classes/AV Rule 79.ql

@@ -118,7 +118,7 @@ private predicate exprReleases(Expr e, Expr released, string kind) {
 }
 
 class Resource extends MemberVariable {
-  Resource() { not isStatic() }
+  Resource() { not this.isStatic() }
 
   // Check that an expr is somewhere in this class - does not have to be a constructor
   predicate inSameClass(Expr e) {
@@ -129,7 +129,7 @@ class Resource extends MemberVariable {
     f instanceof Destructor and f.getDeclaringType() = this.getDeclaringType()
     or
     exists(Function mid, FunctionCall fc |
-      calledFromDestructor(mid) and
+      this.calledFromDestructor(mid) and
       fc.getEnclosingFunction() = mid and
       fc.getTarget() = f and
       f.getDeclaringType() = this.getDeclaringType()
@@ -137,7 +137,7 @@ class Resource extends MemberVariable {
   }
 
   predicate inDestructor(Expr e) {
-    exists(Function f | f = e.getEnclosingFunction() | calledFromDestructor(f))
+    exists(Function f | f = e.getEnclosingFunction() | this.calledFromDestructor(f))
   }
 
   predicate acquisitionWithRequiredKind(Assignment acquireAssign, string kind) {

cpp/ql/src/qlpack.yml

@@ -1,5 +1,6 @@
 name: codeql/cpp-queries
-version: 0.0.2
+version: 0.0.5-dev
+groups: cpp
 dependencies:
     codeql/cpp-all: "*"
     codeql/suite-helpers: "*"

cpp/ql/test/experimental/library-tests/rangeanalysis/extensibility/extensibility.ql

@@ -29,7 +29,8 @@ class CustomAddFunctionCall extends SimpleRangeAnalysisExpr, FunctionCall {
 
 class SelfSub extends SimpleRangeAnalysisExpr, SubExpr {
   SelfSub() {
-    getLeftOperand().(VariableAccess).getTarget() = getRightOperand().(VariableAccess).getTarget()
+    this.getLeftOperand().(VariableAccess).getTarget() =
+      this.getRightOperand().(VariableAccess).getTarget()
   }
 
   override float getLowerBounds() { result = 0 }

cpp/ql/test/experimental/query-tests/Security/CWE/CWE-703/semmle/tests/FindIncorrectlyUsedExceptions.expected

@@ -1,3 +1,3 @@
-| test.cpp:35:3:35:33 | call to runtime_error | This object does not generate an exception. |
+| test.cpp:35:3:35:33 | call to runtime_error | Object creation of exception type on stack. Did you forget the throw keyword? |
 | test.cpp:41:3:41:11 | call to funcTest1 | There is an exception in the function that requires your attention. |
 | test.cpp:42:3:42:9 | call to DllMain | DllMain contains an exeption not wrapped in a try..catch block. |

cpp/ql/test/library-tests/dataflow/DefaultTaintTracking/annotate_path_to_sink/dispatch.cpp

@@ -4,8 +4,8 @@ using SinkFunction = void (*)(int);
 
 void notSink(int notSinkParam);
 
-void callsSink(int sinkParam) { // $ ir-path=31:28 ir-path=32:31 ir-path=34:22
-  sink(sinkParam); // $ ir-sink=31:28 ir-sink=32:31 ir-sink=34:22 ast=31:28 ast=32:31 ast=34:22 MISSING: ast,ir=28
+void callsSink(int sinkParam) { // $ ir-path=31:23 ir-path=32:26 ir-path=34:17
+  sink(sinkParam); // $ ast=31:28 ast=32:31 ast=34:22 ir-sink
 }
 
 struct {
@@ -25,7 +25,7 @@ void assignGlobals() {
 };
 
 void testStruct() {
-  globalStruct.sinkPtr(atoi(getenv("TAINTED"))); // $ ir MISSING: ast
+  globalStruct.sinkPtr(atoi(getenv("TAINTED"))); // $ MISSING: ir-path,ast
   globalStruct.notSinkPtr(atoi(getenv("TAINTED"))); // clean
 
   globalUnion.sinkPtr(atoi(getenv("TAINTED"))); // $ ast ir-path
@@ -48,8 +48,8 @@ class D2 : public D1 {
 
 class D3 : public D2 {
     public:
-    void f(const char* p) override { // $ ir-path=58:10 ir-path=60:17 ir-path=61:28 ir-path=62:29 ir-path=63:33 ir-path=73:30
-        sink(p); // $ ir-sink=58:10 ir-sink=60:17 ir-sink=61:28 ir-sink=62:29 ir-sink=63:33 ast=58:10 ast=60:17 ast=61:28 ast=62:29 ast=63:33 SPURIOUS: ast=73:30 ir-sink=73:30
+    void f(const char* p) override { // $ ir-path=58:10 ir-path=60:17 ir-path=61:28 ir-path=62:29 ir-path=63:33 SPURIOUS: ir-path=73:30
+        sink(p); // $ ast=58:10 ast=60:17 ast=61:28 ast=62:29 ast=63:33 ir-sink SPURIOUS: ast=73:30
     }
 };
 

cpp/ql/test/library-tests/dataflow/DefaultTaintTracking/annotate_path_to_sink/tainted.ql

@@ -23,11 +23,10 @@ class SourceConfiguration extends TaintedWithPath::TaintTrackingConfiguration {
   override predicate isSink(Element e) { isSinkArgument(e) }
 }
 
-predicate irTaint(Element source, Element sink, string tag) {
-  exists(TaintedWithPath::PathNode sinkNode, TaintedWithPath::PathNode predNode |
+predicate irTaint(Element source, TaintedWithPath::PathNode predNode, string tag) {
+  exists(TaintedWithPath::PathNode sinkNode |
     TaintedWithPath::taintedWithPath(source, _, _, sinkNode) and
     predNode = getAPredecessor*(sinkNode) and
-    sink = getElementFromPathNode(predNode) and
     // Make sure the path is actually reachable from this predecessor.
     // Otherwise, we could pick `predNode` to be b when `source` is
     // `source1` in this dataflow graph:
@@ -35,7 +34,7 @@ predicate irTaint(Element source, Element sink, string tag) {
     //                   ^
     // source2 ---> b --/
     source = getElementFromPathNode(getAPredecessor*(predNode)) and
-    if sinkNode = predNode then tag = "ir-sink" else tag = "ir-path"
+    if predNode = sinkNode then tag = "ir-sink" else tag = "ir-path"
   )
 }
 
@@ -45,21 +44,25 @@ class IRDefaultTaintTrackingTest extends InlineExpectationsTest {
   override string getARelevantTag() { result = ["ir-path", "ir-sink"] }
 
   override predicate hasActualResult(Location location, string element, string tag, string value) {
-    exists(Element source, Element tainted, int n |
-      irTaint(source, tainted, tag) and
-      n = strictcount(Element otherSource | irTaint(otherSource, tainted, _)) and
-      (
-        n = 1 and value = ""
-        or
-        // If there is more than one source for this sink
-        // we specify the source location explicitly.
-        n > 1 and
+    exists(Element source, Element elem, TaintedWithPath::PathNode node, int n |
+      irTaint(source, node, tag) and
+      elem = getElementFromPathNode(node) and
+      n = count(int startline | getAPredecessor(node).hasLocationInfo(_, startline, _, _, _)) and
+      location = elem.getLocation() and
+      element = elem.toString()
+    |
+      // Zero predecessors means it's a source, and 1 predecessor means it has a unique predecessor.
+      // In either of these cases we leave out the location.
+      n = [0, 1] and value = ""
+      or
+      // If there is more than one predecessor for this node
+      // we specify the source location explicitly.
+      n > 1 and
+      exists(TaintedWithPath::PathNode pred | pred = getAPredecessor(node) |
         value =
-          source.getLocation().getStartLine().toString() + ":" +
-            source.getLocation().getStartColumn()
-      ) and
-      location = tainted.getLocation() and
-      element = tainted.toString()
+          getElementFromPathNode(pred).getLocation().getStartLine().toString() + ":" +
+            getElementFromPathNode(pred).getLocation().getStartColumn()
+      )
     )
   }
 }

cpp/ql/test/library-tests/dataflow/DefaultTaintTracking/annotate_path_to_sink/test_diff.cpp

@@ -13,8 +13,8 @@ struct S {
     }
 };
 
-void calls_sink_with_argv(const char* a) { // $ ir-path=96:26 ir-path=98:18
-    sink(a); // $ ast=96:26 ast=98:18 ir-sink=96:26 ir-sink=98:18
+void calls_sink_with_argv(const char* a) { // $ ir-path=96:26 ir-path=102:26
+    sink(a); // $ ast=96:26 ast=98:18 ir-sink
 }
 
 extern int i;
@@ -27,7 +27,7 @@ public:
 class DerivedCallsSink : public BaseWithPureVirtual {
 public:
     void f(const char* p) override { // $ ir-path
-        sink(p); // $ ir-sink ast=108:10 SPURIOUS: ast=111:10
+        sink(p); // $ ast=108:10 ir-sink SPURIOUS: ast=111:10
     }
 };
 
@@ -49,8 +49,8 @@ public:
 };
 
 class DerivesMultiple : public DerivedCallsSinkDiamond1, public DerivedDoesNotCallSinkDiamond2 {
-    void f(const char* p) override { // $ ir-path
-        DerivedCallsSinkDiamond1::f(p);
+    void f(const char* p) override { // $ ir-path=53:37 ir-path=115:11
+        DerivedCallsSinkDiamond1::f(p); // $ ir-path
     }
 };
 
@@ -58,7 +58,7 @@ template<typename T>
 class CRTP {
 public:
     void f(const char* p) { // $ ir-path
-        static_cast<T*>(this)->g(p);
+        static_cast<T*>(this)->g(p); // $ ir-path
     }
 };
 
@@ -79,7 +79,7 @@ class Derived2 : public Derived1 {
 class Derived3 : public Derived2 {
     public:
     void f(const char* p) override { // $ ir-path=124:19 ir-path=126:43 ir-path=128:44
-        sink(p); // $ ast,ir-sink=124:19 ast,ir-sink=126:43 ast,ir-sink=128:44
+        sink(p); // $ ast=124:19 ast=126:43 ast=128:44 ir-sink
     }
 };
 
@@ -97,11 +97,11 @@ int main(int argc, char *argv[]) {
 
     char*** p = &argv; // $ ast,ir-path
 
-    sink(*p[0]); // $ ast,ir-sink
+    sink(*p[0]); // $ ast ir-sink=96:26 ir-sink=98:18
 
-    calls_sink_with_argv(*p[i]); // $ MISSING: ast,ir-path
+    calls_sink_with_argv(*p[i]); // $ ir-path=96:26 ir-path=98:18 MISSING:ast
 
-    sink(*(argv + 1)); // $ ast,ir-path ir-sink
+    sink(*(argv + 1)); // $ ast ir-path ir-sink
 
     BaseWithPureVirtual* b = new DerivedCallsSink;
 

cpp/ql/test/library-tests/dataflow/DefaultTaintTracking/annotate_sinks_only/defaulttainttracking.cpp

@@ -190,9 +190,9 @@ void test_pointers1()
 	sink(ptr1); // $ ast MISSING: ir
 	sink(ptr2); // $ SPURIOUS: ast
 	sink(*ptr2); // $ ast MISSING: ir
-	sink(ptr3); // $ ast MISSING: ir
-	sink(ptr4); // $ SPURIOUS: ast
-	sink(*ptr4); // $ ast MISSING: ir
+	sink(ptr3); // $ ast,ir
+	sink(ptr4); // $ SPURIOUS: ast,ir
+	sink(*ptr4); // $ ast,ir
 }
 
 void test_pointers2()

cpp/ql/test/library-tests/dataflow/dataflow-tests/dataflow-ir-consistency.expected

@@ -35,17 +35,17 @@ postWithInFlow
 | BarrierGuard.cpp:60:3:60:4 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | BarrierGuard.cpp:60:7:60:7 | x [post update] | PostUpdateNode should not be the target of local flow. |
 | clang.cpp:8:20:8:29 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
-| clang.cpp:22:3:22:6 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
+| clang.cpp:22:8:22:20 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | clang.cpp:22:8:22:20 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | clang.cpp:22:9:22:20 | sourceArray1 [post update] | PostUpdateNode should not be the target of local flow. |
 | clang.cpp:26:8:26:24 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | clang.cpp:26:8:26:24 | sourceStruct1_ptr [post update] | PostUpdateNode should not be the target of local flow. |
-| clang.cpp:26:27:26:34 | sourceStruct1_ptr [post update] | PostUpdateNode should not be the target of local flow. |
+| clang.cpp:26:8:26:24 | sourceStruct1_ptr [post update] | PostUpdateNode should not be the target of local flow. |
 | clang.cpp:28:3:28:19 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | clang.cpp:28:22:28:23 | m1 [post update] | PostUpdateNode should not be the target of local flow. |
 | clang.cpp:30:8:30:24 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | clang.cpp:30:8:30:24 | sourceStruct1_ptr [post update] | PostUpdateNode should not be the target of local flow. |
-| clang.cpp:30:27:30:34 | sourceStruct1_ptr [post update] | PostUpdateNode should not be the target of local flow. |
+| clang.cpp:30:8:30:24 | sourceStruct1_ptr [post update] | PostUpdateNode should not be the target of local flow. |
 | clang.cpp:34:19:34:41 | FieldAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | clang.cpp:34:19:34:41 | FieldAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | clang.cpp:39:16:39:21 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
@@ -77,55 +77,55 @@ postWithInFlow
 | dispatch.cpp:29:29:29:34 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:31:8:31:13 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:31:8:31:13 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:31:16:31:24 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:31:8:31:13 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:32:8:32:13 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:32:8:32:13 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:32:16:32:24 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:32:8:32:13 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:33:3:33:8 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:33:3:33:8 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:33:11:33:16 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:33:3:33:8 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:35:8:35:13 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:35:8:35:13 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:35:16:35:25 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:35:8:35:13 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:36:8:36:13 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:36:8:36:13 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:36:16:36:25 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:36:8:36:13 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:37:3:37:8 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:37:3:37:8 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:37:11:37:17 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:37:3:37:8 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:39:8:39:13 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:39:8:39:13 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:39:8:39:13 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:39:15:39:23 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:39:8:39:13 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:40:8:40:13 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:40:8:40:13 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:40:8:40:13 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:40:15:40:23 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:40:8:40:13 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:41:3:41:8 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:41:3:41:8 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:41:3:41:8 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:41:10:41:15 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:41:3:41:8 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:43:8:43:13 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:43:8:43:13 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:43:8:43:13 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:43:15:43:24 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:43:8:43:13 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:44:8:44:13 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:44:8:44:13 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:44:8:44:13 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:44:15:44:24 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:44:8:44:13 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:45:3:45:8 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:45:3:45:8 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:45:3:45:8 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:45:10:45:16 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:45:3:45:8 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:51:3:51:22 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:55:8:55:19 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:55:8:55:19 | globalBottom [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:55:22:55:30 | globalBottom [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:55:8:55:19 | globalBottom [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:56:8:56:19 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:56:8:56:19 | globalMiddle [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:56:22:56:30 | globalMiddle [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:56:8:56:19 | globalMiddle [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:58:8:58:23 | call to readGlobalBottom [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:58:8:58:23 | call to readGlobalBottom [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:58:28:58:36 | call to readGlobalBottom [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:60:3:60:14 | globalBottom [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:60:18:60:29 | Call [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:60:18:60:29 | new [post update] | PostUpdateNode should not be the target of local flow. |
@@ -140,34 +140,34 @@ postWithInFlow
 | dispatch.cpp:65:10:65:21 | new [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:69:3:69:5 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:69:3:69:5 | top [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:69:8:69:13 | top [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:69:3:69:5 | top [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:73:3:73:5 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:73:3:73:5 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:73:3:73:5 | top [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:73:7:73:12 | top [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:77:3:77:19 | call to allocateBottom [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:73:3:73:5 | top [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:77:21:77:34 | call to allocateBottom [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:77:21:77:34 | call to allocateBottom [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:78:3:78:21 | * ... [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:78:23:78:39 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:78:23:78:39 | * ... [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:78:23:78:39 | * ... [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:78:24:78:37 | call to allocateBottom [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:80:8:80:8 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:81:3:81:3 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:81:3:81:3 | x [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:81:6:81:11 | x [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:81:3:81:3 | x [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:85:3:85:13 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:89:3:89:10 | bottom [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:89:3:89:10 | call to identity [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:89:3:89:10 | call to identity [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:89:12:89:17 | (Middle *)... [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:89:12:89:17 | (Top *)... [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:89:12:89:17 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:89:12:89:17 | bottom [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:89:21:89:26 | call to identity [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:89:12:89:17 | bottom [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:90:3:90:10 | call to identity [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:90:3:90:10 | call to identity [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:90:3:90:10 | top [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:90:12:90:14 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:90:12:90:14 | top [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:90:18:90:23 | call to identity [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:90:12:90:14 | top [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:100:3:100:18 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:105:5:105:17 | maybeCallSink [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:113:30:113:38 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
@@ -176,11 +176,11 @@ postWithInFlow
 | dispatch.cpp:127:31:127:36 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:129:10:129:15 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:129:10:129:15 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:129:18:129:25 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:129:10:129:15 | topPtr [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:130:10:130:15 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:130:10:130:15 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:130:10:130:15 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
-| dispatch.cpp:130:17:130:24 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
+| dispatch.cpp:130:10:130:15 | topRef [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:148:3:148:3 | u [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:148:5:148:5 | f [post update] | PostUpdateNode should not be the target of local flow. |
 | dispatch.cpp:168:3:168:4 | u2 [post update] | PostUpdateNode should not be the target of local flow. |
@@ -191,10 +191,10 @@ postWithInFlow
 | example.c:24:9:24:9 | x [post update] | PostUpdateNode should not be the target of local flow. |
 | example.c:24:20:24:20 | y [post update] | PostUpdateNode should not be the target of local flow. |
 | example.c:26:9:26:9 | x [post update] | PostUpdateNode should not be the target of local flow. |
-| example.c:26:13:26:16 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
+| example.c:26:18:26:24 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | example.c:26:18:26:24 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | example.c:26:19:26:24 | coords [post update] | PostUpdateNode should not be the target of local flow. |
-| example.c:28:2:28:12 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
+| example.c:28:14:28:25 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | example.c:28:14:28:25 | (void *)... [post update] | PostUpdateNode should not be the target of local flow. |
 | example.c:28:22:28:25 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | example.c:28:23:28:25 | pos [post update] | PostUpdateNode should not be the target of local flow. |
@@ -227,23 +227,23 @@ postWithInFlow
 | lambdas.cpp:43:3:43:3 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | lambdas.cpp:43:3:43:3 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | lambdas.cpp:43:3:43:3 | c [post update] | PostUpdateNode should not be the target of local flow. |
-| lambdas.cpp:45:3:45:3 | t [post update] | PostUpdateNode should not be the target of local flow. |
-| lambdas.cpp:45:3:45:3 | u [post update] | PostUpdateNode should not be the target of local flow. |
-| lambdas.cpp:45:3:45:3 | w [post update] | PostUpdateNode should not be the target of local flow. |
 | lambdas.cpp:45:4:45:4 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | lambdas.cpp:45:4:45:4 | t [post update] | PostUpdateNode should not be the target of local flow. |
+| lambdas.cpp:45:4:45:4 | t [post update] | PostUpdateNode should not be the target of local flow. |
 | lambdas.cpp:45:7:45:7 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | lambdas.cpp:45:7:45:7 | u [post update] | PostUpdateNode should not be the target of local flow. |
+| lambdas.cpp:45:7:45:7 | u [post update] | PostUpdateNode should not be the target of local flow. |
 | lambdas.cpp:45:10:45:10 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | lambdas.cpp:45:10:45:10 | w [post update] | PostUpdateNode should not be the target of local flow. |
+| lambdas.cpp:45:10:45:10 | w [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:11:5:11:7 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:11:5:11:7 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:11:5:11:7 | lhs [post update] | PostUpdateNode should not be the target of local flow. |
-| ref.cpp:16:5:16:10 | lhs [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:16:12:16:14 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:16:12:16:14 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:16:12:16:14 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:16:12:16:14 | lhs [post update] | PostUpdateNode should not be the target of local flow. |
+| ref.cpp:16:12:16:14 | lhs [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:20:5:20:7 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:20:5:20:7 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:20:5:20:7 | lhs [post update] | PostUpdateNode should not be the target of local flow. |
@@ -259,11 +259,11 @@ postWithInFlow
 | ref.cpp:31:7:31:9 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:31:7:31:9 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:31:7:31:9 | out [post update] | PostUpdateNode should not be the target of local flow. |
-| ref.cpp:37:7:37:19 | out [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:37:21:37:23 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:37:21:37:23 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:37:21:37:23 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:37:21:37:23 | out [post update] | PostUpdateNode should not be the target of local flow. |
+| ref.cpp:37:21:37:23 | out [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:39:7:39:9 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:39:7:39:9 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:39:7:39:9 | out [post update] | PostUpdateNode should not be the target of local flow. |
@@ -276,26 +276,26 @@ postWithInFlow
 | ref.cpp:48:7:48:9 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:48:7:48:9 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:48:7:48:9 | out [post update] | PostUpdateNode should not be the target of local flow. |
-| ref.cpp:55:5:55:17 | x1 [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:55:19:55:20 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:55:19:55:20 | x1 [post update] | PostUpdateNode should not be the target of local flow. |
-| ref.cpp:58:5:58:13 | x2 [post update] | PostUpdateNode should not be the target of local flow. |
+| ref.cpp:55:19:55:20 | x1 [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:58:15:58:16 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:58:15:58:16 | x2 [post update] | PostUpdateNode should not be the target of local flow. |
-| ref.cpp:61:5:61:24 | x3 [post update] | PostUpdateNode should not be the target of local flow. |
+| ref.cpp:58:15:58:16 | x2 [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:61:26:61:27 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:61:26:61:27 | x3 [post update] | PostUpdateNode should not be the target of local flow. |
-| ref.cpp:64:5:64:13 | x4 [post update] | PostUpdateNode should not be the target of local flow. |
+| ref.cpp:61:26:61:27 | x3 [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:64:15:64:16 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:64:15:64:16 | x4 [post update] | PostUpdateNode should not be the target of local flow. |
+| ref.cpp:64:15:64:16 | x4 [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:75:5:75:7 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:75:5:75:7 | lhs [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:75:9:75:11 | val [post update] | PostUpdateNode should not be the target of local flow. |
-| ref.cpp:79:5:79:10 | lhs [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:79:12:79:14 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:79:12:79:14 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:79:12:79:14 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:79:12:79:14 | lhs [post update] | PostUpdateNode should not be the target of local flow. |
+| ref.cpp:79:12:79:14 | lhs [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:83:5:83:7 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:83:5:83:7 | lhs [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:83:9:83:11 | val [post update] | PostUpdateNode should not be the target of local flow. |
@@ -311,11 +311,11 @@ postWithInFlow
 | ref.cpp:96:7:96:9 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:96:7:96:9 | out [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:96:11:96:13 | val [post update] | PostUpdateNode should not be the target of local flow. |
-| ref.cpp:102:7:102:19 | out [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:102:21:102:23 | (reference dereference) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:102:21:102:23 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:102:21:102:23 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:102:21:102:23 | out [post update] | PostUpdateNode should not be the target of local flow. |
+| ref.cpp:102:21:102:23 | out [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:104:7:104:9 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:104:7:104:9 | out [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:104:11:104:13 | val [post update] | PostUpdateNode should not be the target of local flow. |
@@ -328,18 +328,18 @@ postWithInFlow
 | ref.cpp:115:7:115:9 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:115:7:115:9 | out [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:115:11:115:13 | val [post update] | PostUpdateNode should not be the target of local flow. |
-| ref.cpp:122:5:122:17 | x1 [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:122:19:122:20 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:122:19:122:20 | x1 [post update] | PostUpdateNode should not be the target of local flow. |
-| ref.cpp:125:5:125:13 | x2 [post update] | PostUpdateNode should not be the target of local flow. |
+| ref.cpp:122:19:122:20 | x1 [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:125:15:125:16 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:125:15:125:16 | x2 [post update] | PostUpdateNode should not be the target of local flow. |
-| ref.cpp:128:5:128:24 | x3 [post update] | PostUpdateNode should not be the target of local flow. |
+| ref.cpp:125:15:125:16 | x2 [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:128:26:128:27 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:128:26:128:27 | x3 [post update] | PostUpdateNode should not be the target of local flow. |
-| ref.cpp:131:5:131:13 | x4 [post update] | PostUpdateNode should not be the target of local flow. |
+| ref.cpp:128:26:128:27 | x3 [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:131:15:131:16 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | ref.cpp:131:15:131:16 | x4 [post update] | PostUpdateNode should not be the target of local flow. |
+| ref.cpp:131:15:131:16 | x4 [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:6:7:6:8 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:8:3:8:4 | t2 [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:12:5:12:6 | t2 [post update] | PostUpdateNode should not be the target of local flow. |
@@ -520,40 +520,40 @@ postWithInFlow
 | test.cpp:374:5:374:20 | this [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:374:5:374:20 | this [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:383:7:383:9 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
-| test.cpp:384:3:384:8 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
+| test.cpp:384:10:384:13 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:384:10:384:13 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:384:10:384:13 | (void *)... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:384:11:384:13 | tmp [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:389:7:389:9 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:390:8:390:14 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
-| test.cpp:391:3:391:8 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
+| test.cpp:391:10:391:13 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:391:10:391:13 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:391:10:391:13 | (void *)... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:391:11:391:13 | tmp [post update] | PostUpdateNode should not be the target of local flow. |
-| test.cpp:400:3:400:8 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
+| test.cpp:400:10:400:13 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:400:10:400:13 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:400:10:400:13 | (void *)... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:400:11:400:13 | tmp [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:406:8:406:14 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
-| test.cpp:407:3:407:8 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
+| test.cpp:407:10:407:13 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:407:10:407:13 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:407:10:407:13 | (void *)... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:407:11:407:13 | tmp [post update] | PostUpdateNode should not be the target of local flow. |
-| test.cpp:417:3:417:14 | local [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:417:16:417:20 | (reference to) [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:417:16:417:20 | local [post update] | PostUpdateNode should not be the target of local flow. |
-| test.cpp:423:3:423:18 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
+| test.cpp:417:16:417:20 | local [post update] | PostUpdateNode should not be the target of local flow. |
+| test.cpp:423:20:423:25 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:423:20:423:25 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:423:21:423:25 | local [post update] | PostUpdateNode should not be the target of local flow. |
-| test.cpp:429:3:429:18 | local [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:429:20:429:24 | array to pointer conversion [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:429:20:429:24 | local [post update] | PostUpdateNode should not be the target of local flow. |
-| test.cpp:436:3:436:16 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
+| test.cpp:429:20:429:24 | local [post update] | PostUpdateNode should not be the target of local flow. |
+| test.cpp:436:18:436:23 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:436:18:436:23 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:436:19:436:23 | local [post update] | PostUpdateNode should not be the target of local flow. |
-| test.cpp:442:3:442:16 | local [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:442:18:442:22 | array to pointer conversion [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:442:18:442:22 | local [post update] | PostUpdateNode should not be the target of local flow. |
+| test.cpp:442:18:442:22 | local [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:453:7:453:11 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:456:7:456:9 | tmp [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:458:7:458:9 | tmp [post update] | PostUpdateNode should not be the target of local flow. |
@@ -561,12 +561,12 @@ postWithInFlow
 | test.cpp:465:4:465:4 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:465:4:465:4 | p [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:469:7:469:7 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
-| test.cpp:470:3:470:19 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
+| test.cpp:470:21:470:22 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:470:21:470:22 | & ... [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:470:22:470:22 | x [post update] | PostUpdateNode should not be the target of local flow. |
-| test.cpp:481:3:481:19 | content [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:481:21:481:21 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:481:21:481:30 | (void *)... [post update] | PostUpdateNode should not be the target of local flow. |
+| test.cpp:481:21:481:30 | content [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:481:24:481:30 | FieldAddress [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:481:24:481:30 | content [post update] | PostUpdateNode should not be the target of local flow. |
 | test.cpp:482:8:482:16 | VariableAddress [post update] | PostUpdateNode should not be the target of local flow. |

cpp/ql/test/library-tests/dataflow/dataflow-tests/localFlow.expected

@@ -1,3 +1,4 @@
+| example.c:15:37:15:37 | b | example.c:15:37:15:37 | b |
 | example.c:15:37:15:37 | b | example.c:19:6:19:6 | b |
 | example.c:15:44:15:46 | pos | example.c:24:24:24:26 | pos |
 | example.c:15:44:15:46 | pos | example.c:28:23:28:25 | pos |
@@ -70,8 +71,10 @@
 | test.cpp:391:11:391:13 | tmp | test.cpp:391:10:391:13 | & ... |
 | test.cpp:391:17:391:23 | source1 | test.cpp:391:10:391:13 | ref arg & ... |
 | test.cpp:391:17:391:23 | source1 | test.cpp:391:16:391:23 | & ... |
+| test.cpp:480:67:480:67 | s | test.cpp:480:67:480:67 | s |
 | test.cpp:480:67:480:67 | s | test.cpp:481:21:481:21 | s |
 | test.cpp:480:67:480:67 | s | test.cpp:482:20:482:20 | s |
+| test.cpp:481:21:481:21 | s [post update] | test.cpp:480:67:480:67 | s |
 | test.cpp:481:21:481:21 | s [post update] | test.cpp:482:20:482:20 | s |
 | test.cpp:481:24:481:30 | ref arg content | test.cpp:482:23:482:29 | content |
 | test.cpp:482:23:482:29 | content | test.cpp:483:9:483:17 | p_content |

cpp/ql/test/library-tests/dataflow/fields/partial-definition-diff.expected

@@ -1,28 +1,28 @@
 | A.cpp:25:13:25:13 | c | AST only |
 | A.cpp:27:28:27:28 | c | AST only |
 | A.cpp:31:14:31:21 | new | IR only |
-| A.cpp:40:8:40:13 | 0 | IR only |
-| A.cpp:41:8:41:13 | new | IR only |
+| A.cpp:40:15:40:21 | 0 | IR only |
+| A.cpp:41:15:41:21 | new | IR only |
 | A.cpp:41:15:41:21 | new | IR only |
 | A.cpp:47:12:47:18 | new | IR only |
 | A.cpp:54:12:54:18 | new | IR only |
-| A.cpp:55:8:55:10 | new | IR only |
+| A.cpp:55:12:55:19 | new | IR only |
 | A.cpp:55:12:55:19 | new | IR only |
 | A.cpp:57:11:57:24 | new | IR only |
 | A.cpp:57:11:57:24 | new | IR only |
 | A.cpp:57:17:57:23 | new | IR only |
-| A.cpp:57:28:57:30 | new | IR only |
+| A.cpp:57:17:57:23 | new | IR only |
 | A.cpp:62:13:62:19 | new | IR only |
-| A.cpp:64:10:64:15 | new | IR only |
+| A.cpp:64:21:64:28 | new | IR only |
 | A.cpp:64:21:64:28 | new | IR only |
 | A.cpp:71:13:71:19 | new | IR only |
-| A.cpp:73:10:73:19 | new | IR only |
+| A.cpp:73:25:73:32 | new | IR only |
 | A.cpp:73:25:73:32 | new | IR only |
 | A.cpp:89:15:89:21 | new | IR only |
 | A.cpp:99:14:99:21 | new | IR only |
 | A.cpp:100:9:100:9 | a | AST only |
 | A.cpp:116:12:116:19 | new | IR only |
-| A.cpp:126:8:126:10 | new | IR only |
+| A.cpp:126:12:126:18 | new | IR only |
 | A.cpp:126:12:126:18 | new | IR only |
 | A.cpp:130:12:130:18 | new | IR only |
 | A.cpp:142:10:142:10 | c | AST only |
@@ -33,57 +33,57 @@
 | A.cpp:151:12:151:24 | new | IR only |
 | A.cpp:159:12:159:18 | new | IR only |
 | A.cpp:160:18:160:60 | new | IR only |
-| A.cpp:160:18:160:60 | new | IR only |
-| A.cpp:160:32:160:59 | 0 | IR only |
-| A.cpp:160:32:160:59 | 0 | IR only |
 | A.cpp:160:32:160:59 | new | IR only |
-| A.cpp:161:18:161:40 | 0 | IR only |
+| A.cpp:160:32:160:59 | new | IR only |
+| A.cpp:160:43:160:49 | 0 | IR only |
+| A.cpp:160:52:160:58 | 0 | IR only |
 | A.cpp:161:18:161:40 | new | IR only |
-| A.cpp:162:18:162:40 | 0 | IR only |
+| A.cpp:161:29:161:35 | 0 | IR only |
 | A.cpp:162:18:162:40 | new | IR only |
+| A.cpp:162:29:162:35 | 0 | IR only |
 | A.cpp:183:7:183:10 | head | AST only |
 | A.cpp:184:13:184:16 | next | AST only |
-| B.cpp:7:16:7:35 | 0 | IR only |
 | B.cpp:7:16:7:35 | new | IR only |
+| B.cpp:7:28:7:34 | 0 | IR only |
 | B.cpp:8:16:8:27 | new | IR only |
-| B.cpp:16:16:16:38 | 0 | IR only |
 | B.cpp:16:16:16:38 | new | IR only |
+| B.cpp:16:28:16:34 | 0 | IR only |
 | B.cpp:17:16:17:27 | new | IR only |
 | B.cpp:35:13:35:17 | elem1 | AST only |
 | B.cpp:36:13:36:17 | elem2 | AST only |
 | B.cpp:46:13:46:16 | box1 | AST only |
 | C.cpp:18:12:18:18 | new | IR only |
 | C.cpp:24:11:24:12 | s3 | AST only |
-| C.cpp:30:5:30:8 | s2 | IR only |
+| C.cpp:30:10:30:11 | s2 | IR only |
 | C.cpp:30:10:30:11 | this | IR only |
-| C.cpp:32:5:32:8 | s4 | IR only |
+| C.cpp:32:10:32:11 | s4 | IR only |
 | D.cpp:9:21:9:24 | elem | AST only |
 | D.cpp:11:29:11:32 | elem | AST only |
 | D.cpp:16:21:16:23 | box | AST only |
 | D.cpp:18:29:18:31 | box | AST only |
 | D.cpp:29:15:29:41 | new | IR only |
-| D.cpp:29:15:29:41 | new | IR only |
-| D.cpp:29:24:29:40 | 0 | IR only |
 | D.cpp:29:24:29:40 | new | IR only |
+| D.cpp:29:24:29:40 | new | IR only |
+| D.cpp:29:33:29:39 | 0 | IR only |
 | D.cpp:30:13:30:16 | elem | AST only |
 | D.cpp:36:15:36:41 | new | IR only |
-| D.cpp:36:15:36:41 | new | IR only |
-| D.cpp:36:24:36:40 | 0 | IR only |
 | D.cpp:36:24:36:40 | new | IR only |
+| D.cpp:36:24:36:40 | new | IR only |
+| D.cpp:36:33:36:39 | 0 | IR only |
 | D.cpp:43:15:43:41 | new | IR only |
-| D.cpp:43:15:43:41 | new | IR only |
-| D.cpp:43:24:43:40 | 0 | IR only |
 | D.cpp:43:24:43:40 | new | IR only |
+| D.cpp:43:24:43:40 | new | IR only |
+| D.cpp:43:33:43:39 | 0 | IR only |
 | D.cpp:44:19:44:22 | elem | AST only |
 | D.cpp:50:15:50:41 | new | IR only |
-| D.cpp:50:15:50:41 | new | IR only |
-| D.cpp:50:24:50:40 | 0 | IR only |
 | D.cpp:50:24:50:40 | new | IR only |
+| D.cpp:50:24:50:40 | new | IR only |
+| D.cpp:50:33:50:39 | 0 | IR only |
 | D.cpp:57:5:57:12 | boxfield | AST only |
 | D.cpp:57:16:57:42 | new | IR only |
-| D.cpp:57:16:57:42 | new | IR only |
-| D.cpp:57:25:57:41 | 0 | IR only |
 | D.cpp:57:25:57:41 | new | IR only |
+| D.cpp:57:25:57:41 | new | IR only |
+| D.cpp:57:34:57:40 | 0 | IR only |
 | D.cpp:58:20:58:23 | elem | AST only |
 | aliasing.cpp:9:6:9:7 | m1 | AST only |
 | aliasing.cpp:13:5:13:6 | m1 | AST only |
@@ -100,13 +100,13 @@
 | aliasing.cpp:98:5:98:6 | m1 | AST only |
 | aliasing.cpp:106:3:106:5 | * ... | AST only |
 | arrays.cpp:6:3:6:8 | access to array | AST only |
-| arrays.cpp:7:3:7:6 | access to array | IR only |
-| arrays.cpp:8:3:8:6 | access to array | IR only |
-| arrays.cpp:9:3:9:6 | * ... | IR only |
-| arrays.cpp:10:3:10:6 | * ... | IR only |
+| arrays.cpp:7:8:7:13 | access to array | IR only |
+| arrays.cpp:8:8:8:13 | access to array | IR only |
+| arrays.cpp:9:8:9:11 | * ... | IR only |
+| arrays.cpp:10:8:10:15 | * ... | IR only |
 | arrays.cpp:15:3:15:10 | * ... | AST only |
-| arrays.cpp:16:3:16:6 | access to array | IR only |
-| arrays.cpp:17:3:17:6 | access to array | IR only |
+| arrays.cpp:16:8:16:13 | access to array | IR only |
+| arrays.cpp:17:8:17:13 | access to array | IR only |
 | arrays.cpp:36:19:36:22 | data | AST only |
 | arrays.cpp:42:22:42:25 | data | AST only |
 | arrays.cpp:48:22:48:25 | data | AST only |

cpp/ql/test/library-tests/dataflow/fields/path-flow.expected

@@ -10,29 +10,35 @@ edges
 | A.cpp:31:20:31:20 | c | A.cpp:23:10:23:10 | c |
 | A.cpp:31:20:31:20 | c | A.cpp:31:14:31:21 | call to B [c] |
 | A.cpp:41:15:41:21 | new | A.cpp:43:10:43:12 | & ... |
+| A.cpp:43:10:43:12 | & ... | A.cpp:173:26:173:26 | o |
 | A.cpp:47:12:47:18 | new | A.cpp:48:20:48:20 | c |
 | A.cpp:48:12:48:18 | call to make [c] | A.cpp:49:10:49:10 | b [c] |
 | A.cpp:48:20:48:20 | c | A.cpp:29:23:29:23 | c |
 | A.cpp:48:20:48:20 | c | A.cpp:48:12:48:18 | call to make [c] |
 | A.cpp:49:10:49:10 | b [c] | A.cpp:49:13:49:13 | c |
+| A.cpp:49:13:49:13 | c | A.cpp:173:26:173:26 | o |
 | A.cpp:55:5:55:5 | ref arg b [c] | A.cpp:56:10:56:10 | b [c] |
 | A.cpp:55:12:55:19 | new | A.cpp:27:17:27:17 | c |
 | A.cpp:55:12:55:19 | new | A.cpp:55:5:55:5 | ref arg b [c] |
 | A.cpp:56:10:56:10 | b [c] | A.cpp:28:8:28:10 | this [c] |
 | A.cpp:56:10:56:10 | b [c] | A.cpp:56:13:56:15 | call to get |
+| A.cpp:56:13:56:15 | call to get | A.cpp:173:26:173:26 | o |
 | A.cpp:57:11:57:24 | call to B [c] | A.cpp:57:11:57:24 | new [c] |
 | A.cpp:57:11:57:24 | new [c] | A.cpp:28:8:28:10 | this [c] |
 | A.cpp:57:11:57:24 | new [c] | A.cpp:57:28:57:30 | call to get |
 | A.cpp:57:17:57:23 | new | A.cpp:23:10:23:10 | c |
 | A.cpp:57:17:57:23 | new | A.cpp:57:11:57:24 | call to B [c] |
+| A.cpp:57:28:57:30 | call to get | A.cpp:173:26:173:26 | o |
 | A.cpp:64:10:64:15 | call to setOnB [c] | A.cpp:66:10:66:11 | b2 [c] |
 | A.cpp:64:21:64:28 | new | A.cpp:64:10:64:15 | call to setOnB [c] |
 | A.cpp:64:21:64:28 | new | A.cpp:85:26:85:26 | c |
 | A.cpp:66:10:66:11 | b2 [c] | A.cpp:66:14:66:14 | c |
+| A.cpp:66:14:66:14 | c | A.cpp:173:26:173:26 | o |
 | A.cpp:73:10:73:19 | call to setOnBWrap [c] | A.cpp:75:10:75:11 | b2 [c] |
 | A.cpp:73:25:73:32 | new | A.cpp:73:10:73:19 | call to setOnBWrap [c] |
 | A.cpp:73:25:73:32 | new | A.cpp:78:27:78:27 | c |
 | A.cpp:75:10:75:11 | b2 [c] | A.cpp:75:14:75:14 | c |
+| A.cpp:75:14:75:14 | c | A.cpp:173:26:173:26 | o |
 | A.cpp:78:27:78:27 | c | A.cpp:81:21:81:21 | c |
 | A.cpp:81:10:81:15 | call to setOnB [c] | A.cpp:82:12:82:24 | ... ? ... : ... [c] |
 | A.cpp:81:21:81:21 | c | A.cpp:81:10:81:15 | call to setOnB [c] |
@@ -48,13 +54,20 @@ edges
 | A.cpp:103:14:103:14 | c [a] | A.cpp:107:12:107:13 | c1 [a] |
 | A.cpp:103:14:103:14 | c [a] | A.cpp:120:12:120:13 | c1 [a] |
 | A.cpp:107:12:107:13 | c1 [a] | A.cpp:107:16:107:16 | a |
+| A.cpp:107:16:107:16 | a | A.cpp:173:26:173:26 | o |
 | A.cpp:120:12:120:13 | c1 [a] | A.cpp:120:16:120:16 | a |
+| A.cpp:120:16:120:16 | a | A.cpp:173:26:173:26 | o |
+| A.cpp:124:14:124:14 | b [c] | A.cpp:131:8:131:8 | ref arg b [c] |
+| A.cpp:126:5:126:5 | ref arg b [c] | A.cpp:124:14:124:14 | b [c] |
 | A.cpp:126:5:126:5 | ref arg b [c] | A.cpp:131:8:131:8 | ref arg b [c] |
 | A.cpp:126:12:126:18 | new | A.cpp:27:17:27:17 | c |
 | A.cpp:126:12:126:18 | new | A.cpp:126:5:126:5 | ref arg b [c] |
 | A.cpp:131:8:131:8 | ref arg b [c] | A.cpp:132:10:132:10 | b [c] |
 | A.cpp:132:10:132:10 | b [c] | A.cpp:132:13:132:13 | c |
+| A.cpp:132:13:132:13 | c | A.cpp:173:26:173:26 | o |
 | A.cpp:140:13:140:13 | b | A.cpp:143:7:143:31 | ... = ... |
+| A.cpp:140:13:140:13 | b [c] | A.cpp:151:18:151:18 | ref arg b [c] |
+| A.cpp:142:7:142:7 | b [post update] [c] | A.cpp:140:13:140:13 | b [c] |
 | A.cpp:142:7:142:7 | b [post update] [c] | A.cpp:143:7:143:31 | ... = ... [c] |
 | A.cpp:142:7:142:7 | b [post update] [c] | A.cpp:151:18:151:18 | ref arg b [c] |
 | A.cpp:142:7:142:20 | ... = ... | A.cpp:142:7:142:7 | b [post update] [c] |
@@ -66,15 +79,24 @@ edges
 | A.cpp:143:7:143:31 | ... = ... [c] | A.cpp:143:7:143:10 | this [post update] [b, c] |
 | A.cpp:143:25:143:31 | new | A.cpp:143:7:143:31 | ... = ... |
 | A.cpp:150:12:150:18 | new | A.cpp:151:18:151:18 | b |
+| A.cpp:151:12:151:24 | call to D [b, c] | A.cpp:152:10:152:10 | d [b, c] |
 | A.cpp:151:12:151:24 | call to D [b, c] | A.cpp:153:10:153:10 | d [b, c] |
 | A.cpp:151:12:151:24 | call to D [b] | A.cpp:152:10:152:10 | d [b] |
 | A.cpp:151:18:151:18 | b | A.cpp:140:13:140:13 | b |
 | A.cpp:151:18:151:18 | b | A.cpp:151:12:151:24 | call to D [b] |
 | A.cpp:151:18:151:18 | ref arg b [c] | A.cpp:154:10:154:10 | b [c] |
+| A.cpp:152:10:152:10 | d [b, c] | A.cpp:152:13:152:13 | b [c] |
 | A.cpp:152:10:152:10 | d [b] | A.cpp:152:13:152:13 | b |
+| A.cpp:152:10:152:10 | d [post update] [b, c] | A.cpp:153:10:153:10 | d [b, c] |
+| A.cpp:152:13:152:13 | b | A.cpp:173:26:173:26 | o |
+| A.cpp:152:13:152:13 | b [c] | A.cpp:152:13:152:13 | ref arg b [c] |
+| A.cpp:152:13:152:13 | b [c] | A.cpp:173:26:173:26 | o [c] |
+| A.cpp:152:13:152:13 | ref arg b [c] | A.cpp:152:10:152:10 | d [post update] [b, c] |
 | A.cpp:153:10:153:10 | d [b, c] | A.cpp:153:13:153:13 | b [c] |
 | A.cpp:153:13:153:13 | b [c] | A.cpp:153:16:153:16 | c |
+| A.cpp:153:16:153:16 | c | A.cpp:173:26:173:26 | o |
 | A.cpp:154:10:154:10 | b [c] | A.cpp:154:13:154:13 | c |
+| A.cpp:154:13:154:13 | c | A.cpp:173:26:173:26 | o |
 | A.cpp:159:12:159:18 | new | A.cpp:160:29:160:29 | b |
 | A.cpp:160:18:160:60 | call to MyList [head] | A.cpp:161:38:161:39 | l1 [head] |
 | A.cpp:160:29:160:29 | b | A.cpp:160:18:160:60 | call to MyList [head] |
@@ -87,13 +109,23 @@ edges
 | A.cpp:162:38:162:39 | l2 [next, head] | A.cpp:162:18:162:40 | call to MyList [next, next, head] |
 | A.cpp:162:38:162:39 | l2 [next, head] | A.cpp:181:32:181:35 | next [next, head] |
 | A.cpp:165:10:165:11 | l3 [next, next, head] | A.cpp:165:14:165:17 | next [next, head] |
+| A.cpp:165:10:165:11 | l3 [post update] [next, next, head] | A.cpp:167:44:167:44 | l [next, next, head] |
 | A.cpp:165:14:165:17 | next [next, head] | A.cpp:165:20:165:23 | next [head] |
+| A.cpp:165:14:165:17 | next [post update] [next, head] | A.cpp:165:10:165:11 | l3 [post update] [next, next, head] |
 | A.cpp:165:20:165:23 | next [head] | A.cpp:165:26:165:29 | head |
+| A.cpp:165:20:165:23 | next [head] | A.cpp:165:26:165:29 | head |
+| A.cpp:165:20:165:23 | next [post update] [head] | A.cpp:165:14:165:17 | next [post update] [next, head] |
+| A.cpp:165:26:165:29 | head | A.cpp:165:26:165:29 | ref arg head |
+| A.cpp:165:26:165:29 | head | A.cpp:173:26:173:26 | o |
+| A.cpp:165:26:165:29 | ref arg head | A.cpp:165:20:165:23 | next [post update] [head] |
 | A.cpp:167:44:167:44 | l [next, head] | A.cpp:167:47:167:50 | next [head] |
 | A.cpp:167:44:167:44 | l [next, next, head] | A.cpp:167:47:167:50 | next [next, head] |
 | A.cpp:167:47:167:50 | next [head] | A.cpp:169:12:169:12 | l [head] |
 | A.cpp:167:47:167:50 | next [next, head] | A.cpp:167:44:167:44 | l [next, head] |
 | A.cpp:169:12:169:12 | l [head] | A.cpp:169:15:169:18 | head |
+| A.cpp:169:15:169:18 | head | A.cpp:173:26:173:26 | o |
+| A.cpp:173:26:173:26 | o | A.cpp:173:26:173:26 | o |
+| A.cpp:173:26:173:26 | o [c] | A.cpp:173:26:173:26 | o [c] |
 | A.cpp:181:15:181:21 | newHead | A.cpp:183:7:183:20 | ... = ... |
 | A.cpp:181:32:181:35 | next [head] | A.cpp:184:7:184:23 | ... = ... [head] |
 | A.cpp:181:32:181:35 | next [next, head] | A.cpp:184:7:184:23 | ... = ... [next, head] |
@@ -150,6 +182,7 @@ edges
 | D.cpp:22:10:22:11 | b2 [box, elem] | D.cpp:22:14:22:20 | call to getBox1 [elem] |
 | D.cpp:22:14:22:20 | call to getBox1 [elem] | D.cpp:10:11:10:17 | this [elem] |
 | D.cpp:22:14:22:20 | call to getBox1 [elem] | D.cpp:22:25:22:31 | call to getElem |
+| D.cpp:22:25:22:31 | call to getElem | realistic.cpp:41:17:41:17 | o |
 | D.cpp:28:15:28:24 | new | D.cpp:30:5:30:20 | ... = ... |
 | D.cpp:30:5:30:5 | b [post update] [box, elem] | D.cpp:31:14:31:14 | b [box, elem] |
 | D.cpp:30:5:30:20 | ... = ... | D.cpp:30:8:30:10 | box [post update] [elem] |
@@ -182,17 +215,23 @@ edges
 | D.cpp:64:10:64:17 | boxfield [box, elem] | D.cpp:64:20:64:22 | box [elem] |
 | D.cpp:64:10:64:17 | this [boxfield, box, elem] | D.cpp:64:10:64:17 | boxfield [box, elem] |
 | D.cpp:64:20:64:22 | box [elem] | D.cpp:64:25:64:28 | elem |
+| D.cpp:64:25:64:28 | elem | realistic.cpp:41:17:41:17 | o |
 | E.cpp:19:27:19:27 | p [data, buffer] | E.cpp:21:10:21:10 | p [data, buffer] |
 | E.cpp:21:10:21:10 | p [data, buffer] | E.cpp:21:13:21:16 | data [buffer] |
 | E.cpp:21:13:21:16 | data [buffer] | E.cpp:21:18:21:23 | buffer |
+| E.cpp:21:18:21:23 | buffer | realistic.cpp:41:17:41:17 | o |
 | E.cpp:28:21:28:23 | ref arg raw | E.cpp:31:10:31:12 | raw |
 | E.cpp:29:21:29:21 | b [post update] [buffer] | E.cpp:32:10:32:10 | b [buffer] |
 | E.cpp:29:24:29:29 | ref arg buffer | E.cpp:29:21:29:21 | b [post update] [buffer] |
 | E.cpp:30:21:30:21 | p [post update] [data, buffer] | E.cpp:33:18:33:19 | & ... [data, buffer] |
 | E.cpp:30:23:30:26 | data [post update] [buffer] | E.cpp:30:21:30:21 | p [post update] [data, buffer] |
 | E.cpp:30:28:30:33 | ref arg buffer | E.cpp:30:23:30:26 | data [post update] [buffer] |
+| E.cpp:31:10:31:12 | raw | realistic.cpp:41:17:41:17 | o |
 | E.cpp:32:10:32:10 | b [buffer] | E.cpp:32:13:32:18 | buffer |
+| E.cpp:32:13:32:18 | buffer | realistic.cpp:41:17:41:17 | o |
 | E.cpp:33:18:33:19 | & ... [data, buffer] | E.cpp:19:27:19:27 | p [data, buffer] |
+| aliasing.cpp:8:23:8:23 | s [m1] | aliasing.cpp:25:17:25:19 | ref arg & ... [m1] |
+| aliasing.cpp:9:3:9:3 | s [post update] [m1] | aliasing.cpp:8:23:8:23 | s [m1] |
 | aliasing.cpp:9:3:9:3 | s [post update] [m1] | aliasing.cpp:25:17:25:19 | ref arg & ... [m1] |
 | aliasing.cpp:9:3:9:22 | ... = ... | aliasing.cpp:9:3:9:3 | s [post update] [m1] |
 | aliasing.cpp:9:11:9:20 | call to user_input | aliasing.cpp:9:3:9:22 | ... = ... |
@@ -204,30 +243,42 @@ edges
 | aliasing.cpp:25:17:25:19 | ref arg & ... [m1] | aliasing.cpp:29:8:29:9 | s1 [m1] |
 | aliasing.cpp:26:19:26:20 | ref arg s2 [m1] | aliasing.cpp:30:8:30:9 | s2 [m1] |
 | aliasing.cpp:29:8:29:9 | s1 [m1] | aliasing.cpp:29:11:29:12 | m1 |
+| aliasing.cpp:29:11:29:12 | m1 | realistic.cpp:41:17:41:17 | o |
 | aliasing.cpp:30:8:30:9 | s2 [m1] | aliasing.cpp:30:11:30:12 | m1 |
+| aliasing.cpp:30:11:30:12 | m1 | realistic.cpp:41:17:41:17 | o |
 | aliasing.cpp:60:3:60:4 | s2 [post update] [m1] | aliasing.cpp:62:8:62:12 | copy2 [m1] |
 | aliasing.cpp:60:3:60:22 | ... = ... | aliasing.cpp:60:3:60:4 | s2 [post update] [m1] |
 | aliasing.cpp:60:11:60:20 | call to user_input | aliasing.cpp:60:3:60:22 | ... = ... |
 | aliasing.cpp:62:8:62:12 | copy2 [m1] | aliasing.cpp:62:14:62:15 | m1 |
+| aliasing.cpp:62:14:62:15 | m1 | realistic.cpp:41:17:41:17 | o |
 | aliasing.cpp:92:3:92:3 | w [post update] [s, m1] | aliasing.cpp:93:8:93:8 | w [s, m1] |
 | aliasing.cpp:92:3:92:23 | ... = ... | aliasing.cpp:92:5:92:5 | s [post update] [m1] |
 | aliasing.cpp:92:5:92:5 | s [post update] [m1] | aliasing.cpp:92:3:92:3 | w [post update] [s, m1] |
 | aliasing.cpp:92:12:92:21 | call to user_input | aliasing.cpp:92:3:92:23 | ... = ... |
 | aliasing.cpp:93:8:93:8 | w [s, m1] | aliasing.cpp:93:10:93:10 | s [m1] |
 | aliasing.cpp:93:10:93:10 | s [m1] | aliasing.cpp:93:12:93:13 | m1 |
+| aliasing.cpp:93:12:93:13 | m1 | realistic.cpp:41:17:41:17 | o |
+| aliasing.cpp:105:23:105:24 | pa | aliasing.cpp:158:17:158:20 | ref arg data |
+| aliasing.cpp:105:23:105:24 | pa | aliasing.cpp:164:17:164:20 | ref arg data |
+| aliasing.cpp:105:23:105:24 | pa | aliasing.cpp:175:15:175:22 | ref arg & ... |
+| aliasing.cpp:105:23:105:24 | pa | aliasing.cpp:187:15:187:22 | ref arg & ... |
+| aliasing.cpp:105:23:105:24 | pa | aliasing.cpp:200:15:200:24 | ref arg & ... |
 | aliasing.cpp:106:4:106:5 | pa [inner post update] | aliasing.cpp:158:17:158:20 | ref arg data |
 | aliasing.cpp:106:4:106:5 | pa [inner post update] | aliasing.cpp:164:17:164:20 | ref arg data |
 | aliasing.cpp:106:4:106:5 | pa [inner post update] | aliasing.cpp:175:15:175:22 | ref arg & ... |
 | aliasing.cpp:106:4:106:5 | pa [inner post update] | aliasing.cpp:187:15:187:22 | ref arg & ... |
 | aliasing.cpp:106:4:106:5 | pa [inner post update] | aliasing.cpp:200:15:200:24 | ref arg & ... |
+| aliasing.cpp:106:9:106:18 | call to user_input | aliasing.cpp:105:23:105:24 | pa |
 | aliasing.cpp:106:9:106:18 | call to user_input | aliasing.cpp:106:4:106:5 | pa [inner post update] |
 | aliasing.cpp:158:15:158:15 | s [post update] [data] | aliasing.cpp:159:9:159:9 | s [data] |
 | aliasing.cpp:158:17:158:20 | ref arg data | aliasing.cpp:158:15:158:15 | s [post update] [data] |
+| aliasing.cpp:159:8:159:14 | * ... | realistic.cpp:41:17:41:17 | o |
 | aliasing.cpp:159:9:159:9 | s [data] | aliasing.cpp:159:11:159:14 | data |
 | aliasing.cpp:159:11:159:14 | data | aliasing.cpp:159:8:159:14 | * ... |
 | aliasing.cpp:164:15:164:15 | s [post update] [data] | aliasing.cpp:165:8:165:8 | s [data] |
 | aliasing.cpp:164:17:164:20 | ref arg data | aliasing.cpp:164:15:164:15 | s [post update] [data] |
 | aliasing.cpp:165:8:165:8 | s [data] | aliasing.cpp:165:10:165:13 | data |
+| aliasing.cpp:165:8:165:16 | access to array | realistic.cpp:41:17:41:17 | o |
 | aliasing.cpp:165:10:165:13 | data | aliasing.cpp:165:8:165:16 | access to array |
 | aliasing.cpp:175:15:175:22 | ref arg & ... | aliasing.cpp:175:21:175:22 | m1 [inner post update] |
 | aliasing.cpp:175:16:175:17 | s2 [post update] [s, m1] | aliasing.cpp:176:8:176:9 | s2 [s, m1] |
@@ -235,24 +286,33 @@ edges
 | aliasing.cpp:175:21:175:22 | m1 [inner post update] | aliasing.cpp:175:19:175:19 | s [post update] [m1] |
 | aliasing.cpp:176:8:176:9 | s2 [s, m1] | aliasing.cpp:176:11:176:11 | s [m1] |
 | aliasing.cpp:176:11:176:11 | s [m1] | aliasing.cpp:176:13:176:14 | m1 |
+| aliasing.cpp:176:13:176:14 | m1 | realistic.cpp:41:17:41:17 | o |
 | aliasing.cpp:187:15:187:22 | ref arg & ... | aliasing.cpp:187:21:187:22 | m1 [inner post update] |
 | aliasing.cpp:187:16:187:17 | s2 [post update] [s, m1] | aliasing.cpp:189:8:189:11 | s2_2 [s, m1] |
 | aliasing.cpp:187:19:187:19 | s [post update] [m1] | aliasing.cpp:187:16:187:17 | s2 [post update] [s, m1] |
 | aliasing.cpp:187:21:187:22 | m1 [inner post update] | aliasing.cpp:187:19:187:19 | s [post update] [m1] |
 | aliasing.cpp:189:8:189:11 | s2_2 [s, m1] | aliasing.cpp:189:13:189:13 | s [m1] |
 | aliasing.cpp:189:13:189:13 | s [m1] | aliasing.cpp:189:15:189:16 | m1 |
+| aliasing.cpp:189:15:189:16 | m1 | realistic.cpp:41:17:41:17 | o |
 | aliasing.cpp:200:15:200:24 | ref arg & ... | aliasing.cpp:200:23:200:24 | m1 [inner post update] |
 | aliasing.cpp:200:16:200:18 | ps2 [post update] [s, m1] | aliasing.cpp:201:8:201:10 | ps2 [s, m1] |
 | aliasing.cpp:200:21:200:21 | s [post update] [m1] | aliasing.cpp:200:16:200:18 | ps2 [post update] [s, m1] |
 | aliasing.cpp:200:23:200:24 | m1 [inner post update] | aliasing.cpp:200:21:200:21 | s [post update] [m1] |
 | aliasing.cpp:201:8:201:10 | ps2 [s, m1] | aliasing.cpp:201:13:201:13 | s [m1] |
 | aliasing.cpp:201:13:201:13 | s [m1] | aliasing.cpp:201:15:201:16 | m1 |
+| aliasing.cpp:201:15:201:16 | m1 | realistic.cpp:41:17:41:17 | o |
 | arrays.cpp:6:12:6:21 | call to user_input | arrays.cpp:7:8:7:13 | access to array |
 | arrays.cpp:6:12:6:21 | call to user_input | arrays.cpp:8:8:8:13 | access to array |
 | arrays.cpp:6:12:6:21 | call to user_input | arrays.cpp:9:8:9:11 | * ... |
 | arrays.cpp:6:12:6:21 | call to user_input | arrays.cpp:10:8:10:15 | * ... |
+| arrays.cpp:7:8:7:13 | access to array | realistic.cpp:41:17:41:17 | o |
+| arrays.cpp:8:8:8:13 | access to array | realistic.cpp:41:17:41:17 | o |
+| arrays.cpp:9:8:9:11 | * ... | realistic.cpp:41:17:41:17 | o |
+| arrays.cpp:10:8:10:15 | * ... | realistic.cpp:41:17:41:17 | o |
 | arrays.cpp:15:14:15:23 | call to user_input | arrays.cpp:16:8:16:13 | access to array |
 | arrays.cpp:15:14:15:23 | call to user_input | arrays.cpp:17:8:17:13 | access to array |
+| arrays.cpp:16:8:16:13 | access to array | realistic.cpp:41:17:41:17 | o |
+| arrays.cpp:17:8:17:13 | access to array | realistic.cpp:41:17:41:17 | o |
 | arrays.cpp:36:3:36:3 | o [post update] [nested, arr, data] | arrays.cpp:37:8:37:8 | o [nested, arr, data] |
 | arrays.cpp:36:3:36:3 | o [post update] [nested, arr, data] | arrays.cpp:38:8:38:8 | o [nested, arr, data] |
 | arrays.cpp:36:3:36:17 | access to array [post update] [data] | arrays.cpp:36:12:36:14 | arr [inner post update] [data] |
@@ -261,13 +321,22 @@ edges
 | arrays.cpp:36:12:36:14 | arr [inner post update] [data] | arrays.cpp:36:5:36:10 | nested [post update] [arr, data] |
 | arrays.cpp:36:26:36:35 | call to user_input | arrays.cpp:36:3:36:37 | ... = ... |
 | arrays.cpp:37:8:37:8 | o [nested, arr, data] | arrays.cpp:37:10:37:15 | nested [arr, data] |
+| arrays.cpp:37:8:37:8 | o [post update] [nested, arr, data] | arrays.cpp:38:8:38:8 | o [nested, arr, data] |
 | arrays.cpp:37:8:37:22 | access to array [data] | arrays.cpp:37:24:37:27 | data |
+| arrays.cpp:37:8:37:22 | access to array [data] | arrays.cpp:37:24:37:27 | data |
+| arrays.cpp:37:8:37:22 | access to array [post update] [data] | arrays.cpp:37:17:37:19 | arr [inner post update] [data] |
 | arrays.cpp:37:10:37:15 | nested [arr, data] | arrays.cpp:37:17:37:19 | arr [data] |
+| arrays.cpp:37:10:37:15 | nested [post update] [arr, data] | arrays.cpp:37:8:37:8 | o [post update] [nested, arr, data] |
 | arrays.cpp:37:17:37:19 | arr [data] | arrays.cpp:37:8:37:22 | access to array [data] |
+| arrays.cpp:37:17:37:19 | arr [inner post update] [data] | arrays.cpp:37:10:37:15 | nested [post update] [arr, data] |
+| arrays.cpp:37:24:37:27 | data | arrays.cpp:37:24:37:27 | ref arg data |
+| arrays.cpp:37:24:37:27 | data | realistic.cpp:41:17:41:17 | o |
+| arrays.cpp:37:24:37:27 | ref arg data | arrays.cpp:37:8:37:22 | access to array [post update] [data] |
 | arrays.cpp:38:8:38:8 | o [nested, arr, data] | arrays.cpp:38:10:38:15 | nested [arr, data] |
 | arrays.cpp:38:8:38:22 | access to array [data] | arrays.cpp:38:24:38:27 | data |
 | arrays.cpp:38:10:38:15 | nested [arr, data] | arrays.cpp:38:17:38:19 | arr [data] |
 | arrays.cpp:38:17:38:19 | arr [data] | arrays.cpp:38:8:38:22 | access to array [data] |
+| arrays.cpp:38:24:38:27 | data | realistic.cpp:41:17:41:17 | o |
 | arrays.cpp:42:3:42:3 | o [post update] [indirect, arr, data] | arrays.cpp:43:8:43:8 | o [indirect, arr, data] |
 | arrays.cpp:42:3:42:3 | o [post update] [indirect, arr, data] | arrays.cpp:44:8:44:8 | o [indirect, arr, data] |
 | arrays.cpp:42:3:42:20 | access to array [post update] [data] | arrays.cpp:42:15:42:17 | arr [inner post update] [data] |
@@ -276,14 +345,24 @@ edges
 | arrays.cpp:42:15:42:17 | arr [inner post update] [data] | arrays.cpp:42:5:42:12 | indirect [post update] [arr, data] |
 | arrays.cpp:42:29:42:38 | call to user_input | arrays.cpp:42:3:42:40 | ... = ... |
 | arrays.cpp:43:8:43:8 | o [indirect, arr, data] | arrays.cpp:43:10:43:17 | indirect [arr, data] |
+| arrays.cpp:43:8:43:8 | o [post update] [indirect, arr, data] | arrays.cpp:44:8:44:8 | o [indirect, arr, data] |
 | arrays.cpp:43:8:43:25 | access to array [data] | arrays.cpp:43:27:43:30 | data |
+| arrays.cpp:43:8:43:25 | access to array [data] | arrays.cpp:43:27:43:30 | data |
+| arrays.cpp:43:8:43:25 | access to array [post update] [data] | arrays.cpp:43:20:43:22 | arr [inner post update] [data] |
 | arrays.cpp:43:10:43:17 | indirect [arr, data] | arrays.cpp:43:20:43:22 | arr [data] |
+| arrays.cpp:43:10:43:17 | indirect [post update] [arr, data] | arrays.cpp:43:8:43:8 | o [post update] [indirect, arr, data] |
 | arrays.cpp:43:20:43:22 | arr [data] | arrays.cpp:43:8:43:25 | access to array [data] |
+| arrays.cpp:43:20:43:22 | arr [inner post update] [data] | arrays.cpp:43:10:43:17 | indirect [post update] [arr, data] |
+| arrays.cpp:43:27:43:30 | data | arrays.cpp:43:27:43:30 | ref arg data |
+| arrays.cpp:43:27:43:30 | data | realistic.cpp:41:17:41:17 | o |
+| arrays.cpp:43:27:43:30 | ref arg data | arrays.cpp:43:8:43:25 | access to array [post update] [data] |
 | arrays.cpp:44:8:44:8 | o [indirect, arr, data] | arrays.cpp:44:10:44:17 | indirect [arr, data] |
 | arrays.cpp:44:8:44:25 | access to array [data] | arrays.cpp:44:27:44:30 | data |
 | arrays.cpp:44:10:44:17 | indirect [arr, data] | arrays.cpp:44:20:44:22 | arr [data] |
 | arrays.cpp:44:20:44:22 | arr [data] | arrays.cpp:44:8:44:25 | access to array [data] |
+| arrays.cpp:44:27:44:30 | data | realistic.cpp:41:17:41:17 | o |
 | by_reference.cpp:11:48:11:52 | value | by_reference.cpp:12:5:12:16 | ... = ... |
+| by_reference.cpp:12:5:12:5 | s [post update] [a] | by_reference.cpp:11:39:11:39 | s [a] |
 | by_reference.cpp:12:5:12:16 | ... = ... | by_reference.cpp:12:5:12:5 | s [post update] [a] |
 | by_reference.cpp:15:26:15:30 | value | by_reference.cpp:16:5:16:19 | ... = ... |
 | by_reference.cpp:16:5:16:19 | ... = ... | by_reference.cpp:16:5:16:8 | this [post update] [a] |
@@ -308,21 +387,30 @@ edges
 | by_reference.cpp:50:17:50:26 | call to user_input | by_reference.cpp:50:3:50:3 | ref arg s [a] |
 | by_reference.cpp:51:8:51:8 | s [a] | by_reference.cpp:35:9:35:19 | this [a] |
 | by_reference.cpp:51:8:51:8 | s [a] | by_reference.cpp:51:10:51:20 | call to getDirectly |
+| by_reference.cpp:51:10:51:20 | call to getDirectly | realistic.cpp:41:17:41:17 | o |
 | by_reference.cpp:56:3:56:3 | ref arg s [a] | by_reference.cpp:57:8:57:8 | s [a] |
 | by_reference.cpp:56:19:56:28 | call to user_input | by_reference.cpp:19:28:19:32 | value |
 | by_reference.cpp:56:19:56:28 | call to user_input | by_reference.cpp:56:3:56:3 | ref arg s [a] |
 | by_reference.cpp:57:8:57:8 | s [a] | by_reference.cpp:39:9:39:21 | this [a] |
 | by_reference.cpp:57:8:57:8 | s [a] | by_reference.cpp:57:10:57:22 | call to getIndirectly |
+| by_reference.cpp:57:10:57:22 | call to getIndirectly | realistic.cpp:41:17:41:17 | o |
 | by_reference.cpp:62:3:62:3 | ref arg s [a] | by_reference.cpp:63:8:63:8 | s [a] |
 | by_reference.cpp:62:25:62:34 | call to user_input | by_reference.cpp:23:34:23:38 | value |
 | by_reference.cpp:62:25:62:34 | call to user_input | by_reference.cpp:62:3:62:3 | ref arg s [a] |
 | by_reference.cpp:63:8:63:8 | s [a] | by_reference.cpp:43:9:43:27 | this [a] |
 | by_reference.cpp:63:8:63:8 | s [a] | by_reference.cpp:63:10:63:28 | call to getThroughNonMember |
+| by_reference.cpp:63:10:63:28 | call to getThroughNonMember | realistic.cpp:41:17:41:17 | o |
 | by_reference.cpp:68:17:68:18 | ref arg & ... [a] | by_reference.cpp:69:22:69:23 | & ... [a] |
 | by_reference.cpp:68:21:68:30 | call to user_input | by_reference.cpp:11:48:11:52 | value |
 | by_reference.cpp:68:21:68:30 | call to user_input | by_reference.cpp:68:17:68:18 | ref arg & ... [a] |
+| by_reference.cpp:69:8:69:20 | call to nonMemberGetA | realistic.cpp:41:17:41:17 | o |
 | by_reference.cpp:69:22:69:23 | & ... [a] | by_reference.cpp:31:46:31:46 | s [a] |
 | by_reference.cpp:69:22:69:23 | & ... [a] | by_reference.cpp:69:8:69:20 | call to nonMemberGetA |
+| by_reference.cpp:83:31:83:35 | inner [a] | by_reference.cpp:102:21:102:39 | ref arg & ... [a] |
+| by_reference.cpp:83:31:83:35 | inner [a] | by_reference.cpp:103:27:103:35 | ref arg inner_ptr [a] |
+| by_reference.cpp:83:31:83:35 | inner [a] | by_reference.cpp:106:21:106:41 | ref arg & ... [a] |
+| by_reference.cpp:83:31:83:35 | inner [a] | by_reference.cpp:107:29:107:37 | ref arg inner_ptr [a] |
+| by_reference.cpp:84:3:84:7 | inner [post update] [a] | by_reference.cpp:83:31:83:35 | inner [a] |
 | by_reference.cpp:84:3:84:7 | inner [post update] [a] | by_reference.cpp:102:21:102:39 | ref arg & ... [a] |
 | by_reference.cpp:84:3:84:7 | inner [post update] [a] | by_reference.cpp:103:27:103:35 | ref arg inner_ptr [a] |
 | by_reference.cpp:84:3:84:7 | inner [post update] [a] | by_reference.cpp:106:21:106:41 | ref arg & ... [a] |
@@ -340,8 +428,11 @@ edges
 | by_reference.cpp:88:3:88:7 | inner [post update] [a] | by_reference.cpp:127:21:127:38 | ref arg * ... [a] |
 | by_reference.cpp:88:3:88:24 | ... = ... | by_reference.cpp:88:3:88:7 | inner [post update] [a] |
 | by_reference.cpp:88:13:88:22 | call to user_input | by_reference.cpp:88:3:88:24 | ... = ... |
+| by_reference.cpp:91:25:91:26 | pa | by_reference.cpp:104:15:104:22 | ref arg & ... |
+| by_reference.cpp:91:25:91:26 | pa | by_reference.cpp:108:15:108:24 | ref arg & ... |
 | by_reference.cpp:92:4:92:5 | pa [inner post update] | by_reference.cpp:104:15:104:22 | ref arg & ... |
 | by_reference.cpp:92:4:92:5 | pa [inner post update] | by_reference.cpp:108:15:108:24 | ref arg & ... |
+| by_reference.cpp:92:9:92:18 | call to user_input | by_reference.cpp:91:25:91:26 | pa |
 | by_reference.cpp:92:9:92:18 | call to user_input | by_reference.cpp:92:4:92:5 | pa [inner post update] |
 | by_reference.cpp:95:25:95:26 | pa | by_reference.cpp:124:21:124:21 | ref arg a |
 | by_reference.cpp:95:25:95:26 | pa | by_reference.cpp:128:23:128:23 | ref arg a |
@@ -364,14 +455,20 @@ edges
 | by_reference.cpp:108:24:108:24 | a [inner post update] | by_reference.cpp:108:16:108:21 | pouter [post update] [a] |
 | by_reference.cpp:110:8:110:12 | outer [inner_nested, a] | by_reference.cpp:110:14:110:25 | inner_nested [a] |
 | by_reference.cpp:110:14:110:25 | inner_nested [a] | by_reference.cpp:110:27:110:27 | a |
+| by_reference.cpp:110:27:110:27 | a | realistic.cpp:41:17:41:17 | o |
 | by_reference.cpp:111:8:111:12 | outer [inner_ptr, a] | by_reference.cpp:111:14:111:22 | inner_ptr [a] |
 | by_reference.cpp:111:14:111:22 | inner_ptr [a] | by_reference.cpp:111:25:111:25 | a |
+| by_reference.cpp:111:25:111:25 | a | realistic.cpp:41:17:41:17 | o |
 | by_reference.cpp:112:8:112:12 | outer [a] | by_reference.cpp:112:14:112:14 | a |
+| by_reference.cpp:112:14:112:14 | a | realistic.cpp:41:17:41:17 | o |
 | by_reference.cpp:114:8:114:13 | pouter [inner_nested, a] | by_reference.cpp:114:16:114:27 | inner_nested [a] |
 | by_reference.cpp:114:16:114:27 | inner_nested [a] | by_reference.cpp:114:29:114:29 | a |
+| by_reference.cpp:114:29:114:29 | a | realistic.cpp:41:17:41:17 | o |
 | by_reference.cpp:115:8:115:13 | pouter [inner_ptr, a] | by_reference.cpp:115:16:115:24 | inner_ptr [a] |
 | by_reference.cpp:115:16:115:24 | inner_ptr [a] | by_reference.cpp:115:27:115:27 | a |
+| by_reference.cpp:115:27:115:27 | a | realistic.cpp:41:17:41:17 | o |
 | by_reference.cpp:116:8:116:13 | pouter [a] | by_reference.cpp:116:16:116:16 | a |
+| by_reference.cpp:116:16:116:16 | a | realistic.cpp:41:17:41:17 | o |
 | by_reference.cpp:122:21:122:25 | outer [post update] [inner_nested, a] | by_reference.cpp:130:8:130:12 | outer [inner_nested, a] |
 | by_reference.cpp:122:27:122:38 | ref arg inner_nested [a] | by_reference.cpp:122:21:122:25 | outer [post update] [inner_nested, a] |
 | by_reference.cpp:123:21:123:36 | ref arg * ... [a] | by_reference.cpp:123:28:123:36 | inner_ptr [inner post update] [a] |
@@ -388,14 +485,20 @@ edges
 | by_reference.cpp:128:23:128:23 | ref arg a | by_reference.cpp:128:15:128:20 | pouter [post update] [a] |
 | by_reference.cpp:130:8:130:12 | outer [inner_nested, a] | by_reference.cpp:130:14:130:25 | inner_nested [a] |
 | by_reference.cpp:130:14:130:25 | inner_nested [a] | by_reference.cpp:130:27:130:27 | a |
+| by_reference.cpp:130:27:130:27 | a | realistic.cpp:41:17:41:17 | o |
 | by_reference.cpp:131:8:131:12 | outer [inner_ptr, a] | by_reference.cpp:131:14:131:22 | inner_ptr [a] |
 | by_reference.cpp:131:14:131:22 | inner_ptr [a] | by_reference.cpp:131:25:131:25 | a |
+| by_reference.cpp:131:25:131:25 | a | realistic.cpp:41:17:41:17 | o |
 | by_reference.cpp:132:8:132:12 | outer [a] | by_reference.cpp:132:14:132:14 | a |
+| by_reference.cpp:132:14:132:14 | a | realistic.cpp:41:17:41:17 | o |
 | by_reference.cpp:134:8:134:13 | pouter [inner_nested, a] | by_reference.cpp:134:16:134:27 | inner_nested [a] |
 | by_reference.cpp:134:16:134:27 | inner_nested [a] | by_reference.cpp:134:29:134:29 | a |
+| by_reference.cpp:134:29:134:29 | a | realistic.cpp:41:17:41:17 | o |
 | by_reference.cpp:135:8:135:13 | pouter [inner_ptr, a] | by_reference.cpp:135:16:135:24 | inner_ptr [a] |
 | by_reference.cpp:135:16:135:24 | inner_ptr [a] | by_reference.cpp:135:27:135:27 | a |
+| by_reference.cpp:135:27:135:27 | a | realistic.cpp:41:17:41:17 | o |
 | by_reference.cpp:136:8:136:13 | pouter [a] | by_reference.cpp:136:16:136:16 | a |
+| by_reference.cpp:136:16:136:16 | a | realistic.cpp:41:17:41:17 | o |
 | complex.cpp:9:7:9:7 | this [a_] | complex.cpp:9:20:9:21 | this [a_] |
 | complex.cpp:9:20:9:21 | this [a_] | complex.cpp:9:20:9:21 | a_ |
 | complex.cpp:10:7:10:7 | this [b_] | complex.cpp:10:20:10:21 | this [b_] |
@@ -439,26 +542,31 @@ edges
 | complex.cpp:65:7:65:8 | b3 [inner, f, a_] | complex.cpp:40:17:40:17 | b [inner, f, a_] |
 | complex.cpp:65:7:65:8 | b3 [inner, f, b_] | complex.cpp:40:17:40:17 | b [inner, f, b_] |
 | conflated.cpp:19:19:19:21 | ref arg raw | conflated.cpp:20:8:20:10 | raw |
+| conflated.cpp:20:8:20:10 | raw | realistic.cpp:41:17:41:17 | o |
 | conflated.cpp:29:3:29:4 | pa [post update] [x] | conflated.cpp:30:8:30:9 | pa [x] |
 | conflated.cpp:29:3:29:22 | ... = ... | conflated.cpp:29:3:29:4 | pa [post update] [x] |
 | conflated.cpp:29:11:29:20 | call to user_input | conflated.cpp:29:3:29:22 | ... = ... |
 | conflated.cpp:30:8:30:9 | pa [x] | conflated.cpp:30:12:30:12 | x |
+| conflated.cpp:30:12:30:12 | x | realistic.cpp:41:17:41:17 | o |
 | conflated.cpp:36:3:36:4 | pa [post update] [x] | conflated.cpp:37:8:37:9 | pa [x] |
 | conflated.cpp:36:3:36:22 | ... = ... | conflated.cpp:36:3:36:4 | pa [post update] [x] |
 | conflated.cpp:36:11:36:20 | call to user_input | conflated.cpp:36:3:36:22 | ... = ... |
 | conflated.cpp:37:8:37:9 | pa [x] | conflated.cpp:37:12:37:12 | x |
+| conflated.cpp:37:12:37:12 | x | realistic.cpp:41:17:41:17 | o |
 | conflated.cpp:54:3:54:4 | ll [post update] [next, y] | conflated.cpp:55:8:55:9 | ll [next, y] |
 | conflated.cpp:54:3:54:28 | ... = ... | conflated.cpp:54:7:54:10 | next [post update] [y] |
 | conflated.cpp:54:7:54:10 | next [post update] [y] | conflated.cpp:54:3:54:4 | ll [post update] [next, y] |
 | conflated.cpp:54:17:54:26 | call to user_input | conflated.cpp:54:3:54:28 | ... = ... |
 | conflated.cpp:55:8:55:9 | ll [next, y] | conflated.cpp:55:12:55:15 | next [y] |
 | conflated.cpp:55:12:55:15 | next [y] | conflated.cpp:55:18:55:18 | y |
+| conflated.cpp:55:18:55:18 | y | realistic.cpp:41:17:41:17 | o |
 | conflated.cpp:60:3:60:4 | ll [post update] [next, y] | conflated.cpp:61:8:61:9 | ll [next, y] |
 | conflated.cpp:60:3:60:28 | ... = ... | conflated.cpp:60:7:60:10 | next [post update] [y] |
 | conflated.cpp:60:7:60:10 | next [post update] [y] | conflated.cpp:60:3:60:4 | ll [post update] [next, y] |
 | conflated.cpp:60:17:60:26 | call to user_input | conflated.cpp:60:3:60:28 | ... = ... |
 | conflated.cpp:61:8:61:9 | ll [next, y] | conflated.cpp:61:12:61:15 | next [y] |
 | conflated.cpp:61:12:61:15 | next [y] | conflated.cpp:61:18:61:18 | y |
+| conflated.cpp:61:18:61:18 | y | realistic.cpp:41:17:41:17 | o |
 | constructors.cpp:18:9:18:9 | this [a_] | constructors.cpp:18:22:18:23 | this [a_] |
 | constructors.cpp:18:22:18:23 | this [a_] | constructors.cpp:18:22:18:23 | a_ |
 | constructors.cpp:19:9:19:9 | this [b_] | constructors.cpp:19:22:19:23 | this [b_] |
@@ -492,6 +600,7 @@ edges
 | qualifiers.cpp:9:21:9:25 | value | qualifiers.cpp:9:30:9:44 | ... = ... |
 | qualifiers.cpp:9:30:9:44 | ... = ... | qualifiers.cpp:9:30:9:33 | this [post update] [a] |
 | qualifiers.cpp:12:40:12:44 | value | qualifiers.cpp:12:49:12:64 | ... = ... |
+| qualifiers.cpp:12:49:12:53 | inner [post update] [a] | qualifiers.cpp:12:27:12:31 | inner [a] |
 | qualifiers.cpp:12:49:12:64 | ... = ... | qualifiers.cpp:12:49:12:53 | inner [post update] [a] |
 | qualifiers.cpp:13:42:13:46 | value | qualifiers.cpp:13:51:13:65 | ... = ... |
 | qualifiers.cpp:13:51:13:55 | inner [post update] [a] | qualifiers.cpp:13:29:13:33 | inner [a] |
@@ -502,18 +611,21 @@ edges
 | qualifiers.cpp:22:27:22:36 | call to user_input | qualifiers.cpp:22:5:22:38 | ... = ... |
 | qualifiers.cpp:23:10:23:14 | outer [inner, a] | qualifiers.cpp:23:16:23:20 | inner [a] |
 | qualifiers.cpp:23:16:23:20 | inner [a] | qualifiers.cpp:23:23:23:23 | a |
+| qualifiers.cpp:23:23:23:23 | a | realistic.cpp:41:17:41:17 | o |
 | qualifiers.cpp:27:5:27:9 | ref arg outer [inner, a] | qualifiers.cpp:28:10:28:14 | outer [inner, a] |
 | qualifiers.cpp:27:11:27:18 | ref arg call to getInner [a] | qualifiers.cpp:27:5:27:9 | ref arg outer [inner, a] |
 | qualifiers.cpp:27:28:27:37 | call to user_input | qualifiers.cpp:9:21:9:25 | value |
 | qualifiers.cpp:27:28:27:37 | call to user_input | qualifiers.cpp:27:11:27:18 | ref arg call to getInner [a] |
 | qualifiers.cpp:28:10:28:14 | outer [inner, a] | qualifiers.cpp:28:16:28:20 | inner [a] |
 | qualifiers.cpp:28:16:28:20 | inner [a] | qualifiers.cpp:28:23:28:23 | a |
+| qualifiers.cpp:28:23:28:23 | a | realistic.cpp:41:17:41:17 | o |
 | qualifiers.cpp:32:17:32:21 | ref arg outer [inner, a] | qualifiers.cpp:33:10:33:14 | outer [inner, a] |
 | qualifiers.cpp:32:23:32:30 | ref arg call to getInner [a] | qualifiers.cpp:32:17:32:21 | ref arg outer [inner, a] |
 | qualifiers.cpp:32:35:32:44 | call to user_input | qualifiers.cpp:12:40:12:44 | value |
 | qualifiers.cpp:32:35:32:44 | call to user_input | qualifiers.cpp:32:23:32:30 | ref arg call to getInner [a] |
 | qualifiers.cpp:33:10:33:14 | outer [inner, a] | qualifiers.cpp:33:16:33:20 | inner [a] |
 | qualifiers.cpp:33:16:33:20 | inner [a] | qualifiers.cpp:33:23:33:23 | a |
+| qualifiers.cpp:33:23:33:23 | a | realistic.cpp:41:17:41:17 | o |
 | qualifiers.cpp:37:19:37:35 | ref arg * ... [a] | qualifiers.cpp:37:26:37:33 | call to getInner [inner post update] [a] |
 | qualifiers.cpp:37:20:37:24 | ref arg outer [inner, a] | qualifiers.cpp:38:10:38:14 | outer [inner, a] |
 | qualifiers.cpp:37:26:37:33 | call to getInner [inner post update] [a] | qualifiers.cpp:37:20:37:24 | ref arg outer [inner, a] |
@@ -521,6 +633,7 @@ edges
 | qualifiers.cpp:37:38:37:47 | call to user_input | qualifiers.cpp:37:19:37:35 | ref arg * ... [a] |
 | qualifiers.cpp:38:10:38:14 | outer [inner, a] | qualifiers.cpp:38:16:38:20 | inner [a] |
 | qualifiers.cpp:38:16:38:20 | inner [a] | qualifiers.cpp:38:23:38:23 | a |
+| qualifiers.cpp:38:23:38:23 | a | realistic.cpp:41:17:41:17 | o |
 | qualifiers.cpp:42:5:42:40 | ... = ... | qualifiers.cpp:42:6:42:22 | * ... [post update] [a] |
 | qualifiers.cpp:42:6:42:22 | * ... [post update] [a] | qualifiers.cpp:42:13:42:20 | call to getInner [inner post update] [a] |
 | qualifiers.cpp:42:7:42:11 | ref arg outer [inner, a] | qualifiers.cpp:43:10:43:14 | outer [inner, a] |
@@ -528,12 +641,15 @@ edges
 | qualifiers.cpp:42:29:42:38 | call to user_input | qualifiers.cpp:42:5:42:40 | ... = ... |
 | qualifiers.cpp:43:10:43:14 | outer [inner, a] | qualifiers.cpp:43:16:43:20 | inner [a] |
 | qualifiers.cpp:43:16:43:20 | inner [a] | qualifiers.cpp:43:23:43:23 | a |
+| qualifiers.cpp:43:23:43:23 | a | realistic.cpp:41:17:41:17 | o |
 | qualifiers.cpp:47:5:47:42 | ... = ... | qualifiers.cpp:47:15:47:22 | call to getInner [post update] [a] |
 | qualifiers.cpp:47:6:47:11 | ref arg & ... [inner, a] | qualifiers.cpp:48:10:48:14 | outer [inner, a] |
 | qualifiers.cpp:47:15:47:22 | call to getInner [post update] [a] | qualifiers.cpp:47:6:47:11 | ref arg & ... [inner, a] |
 | qualifiers.cpp:47:31:47:40 | call to user_input | qualifiers.cpp:47:5:47:42 | ... = ... |
 | qualifiers.cpp:48:10:48:14 | outer [inner, a] | qualifiers.cpp:48:16:48:20 | inner [a] |
 | qualifiers.cpp:48:16:48:20 | inner [a] | qualifiers.cpp:48:23:48:23 | a |
+| qualifiers.cpp:48:23:48:23 | a | realistic.cpp:41:17:41:17 | o |
+| realistic.cpp:41:17:41:17 | o | realistic.cpp:41:17:41:17 | o |
 | realistic.cpp:53:9:53:11 | foo [post update] [bar, baz, userInput, bufferLen] | realistic.cpp:61:21:61:23 | foo [bar, baz, userInput, bufferLen] |
 | realistic.cpp:53:9:53:18 | access to array [post update] [baz, userInput, bufferLen] | realistic.cpp:53:13:53:15 | bar [inner post update] [baz, userInput, bufferLen] |
 | realistic.cpp:53:9:53:66 | ... = ... | realistic.cpp:53:25:53:33 | userInput [post update] [bufferLen] |
@@ -542,10 +658,19 @@ edges
 | realistic.cpp:53:25:53:33 | userInput [post update] [bufferLen] | realistic.cpp:53:20:53:22 | baz [post update] [userInput, bufferLen] |
 | realistic.cpp:53:55:53:64 | call to user_input | realistic.cpp:53:9:53:66 | ... = ... |
 | realistic.cpp:61:21:61:23 | foo [bar, baz, userInput, bufferLen] | realistic.cpp:61:25:61:27 | bar [baz, userInput, bufferLen] |
+| realistic.cpp:61:21:61:23 | foo [post update] [bar, baz, userInput, bufferLen] | realistic.cpp:61:21:61:23 | foo [bar, baz, userInput, bufferLen] |
 | realistic.cpp:61:21:61:30 | access to array [baz, userInput, bufferLen] | realistic.cpp:61:32:61:34 | baz [userInput, bufferLen] |
+| realistic.cpp:61:21:61:30 | access to array [post update] [baz, userInput, bufferLen] | realistic.cpp:61:25:61:27 | bar [inner post update] [baz, userInput, bufferLen] |
 | realistic.cpp:61:25:61:27 | bar [baz, userInput, bufferLen] | realistic.cpp:61:21:61:30 | access to array [baz, userInput, bufferLen] |
+| realistic.cpp:61:25:61:27 | bar [inner post update] [baz, userInput, bufferLen] | realistic.cpp:61:21:61:23 | foo [post update] [bar, baz, userInput, bufferLen] |
+| realistic.cpp:61:32:61:34 | baz [post update] [userInput, bufferLen] | realistic.cpp:61:21:61:30 | access to array [post update] [baz, userInput, bufferLen] |
 | realistic.cpp:61:32:61:34 | baz [userInput, bufferLen] | realistic.cpp:61:37:61:45 | userInput [bufferLen] |
 | realistic.cpp:61:37:61:45 | userInput [bufferLen] | realistic.cpp:61:47:61:55 | bufferLen |
+| realistic.cpp:61:37:61:45 | userInput [bufferLen] | realistic.cpp:61:47:61:55 | bufferLen |
+| realistic.cpp:61:37:61:45 | userInput [post update] [bufferLen] | realistic.cpp:61:32:61:34 | baz [post update] [userInput, bufferLen] |
+| realistic.cpp:61:47:61:55 | bufferLen | realistic.cpp:41:17:41:17 | o |
+| realistic.cpp:61:47:61:55 | bufferLen | realistic.cpp:61:47:61:55 | ref arg bufferLen |
+| realistic.cpp:61:47:61:55 | ref arg bufferLen | realistic.cpp:61:37:61:45 | userInput [post update] [bufferLen] |
 | simple.cpp:18:9:18:9 | this [a_] | simple.cpp:18:22:18:23 | this [a_] |
 | simple.cpp:18:22:18:23 | this [a_] | simple.cpp:18:22:18:23 | a_ |
 | simple.cpp:19:9:19:9 | this [b_] | simple.cpp:19:22:19:23 | this [b_] |
@@ -593,14 +718,28 @@ edges
 | simple.cpp:92:5:92:22 | ... = ... | simple.cpp:92:5:92:5 | a [post update] [i] |
 | simple.cpp:92:11:92:20 | call to user_input | simple.cpp:92:5:92:22 | ... = ... |
 | simple.cpp:94:10:94:11 | a2 [i] | simple.cpp:94:13:94:13 | i |
+| struct_init.c:14:24:14:25 | ab [a] | struct_init.c:14:24:14:25 | ab [a] |
 | struct_init.c:14:24:14:25 | ab [a] | struct_init.c:15:8:15:9 | ab [a] |
 | struct_init.c:15:8:15:9 | ab [a] | struct_init.c:15:12:15:12 | a |
+| struct_init.c:15:8:15:9 | ab [a] | struct_init.c:15:12:15:12 | a |
+| struct_init.c:15:8:15:9 | ab [post update] [a] | struct_init.c:14:24:14:25 | ab [a] |
+| struct_init.c:15:12:15:12 | a | realistic.cpp:41:17:41:17 | o |
+| struct_init.c:15:12:15:12 | a | struct_init.c:15:12:15:12 | ref arg a |
+| struct_init.c:15:12:15:12 | ref arg a | struct_init.c:15:8:15:9 | ab [post update] [a] |
 | struct_init.c:20:17:20:36 | {...} [a] | struct_init.c:22:8:22:9 | ab [a] |
 | struct_init.c:20:17:20:36 | {...} [a] | struct_init.c:24:10:24:12 | & ... [a] |
 | struct_init.c:20:17:20:36 | {...} [a] | struct_init.c:28:5:28:7 | & ... [a] |
 | struct_init.c:20:20:20:29 | call to user_input | struct_init.c:20:17:20:36 | {...} [a] |
 | struct_init.c:22:8:22:9 | ab [a] | struct_init.c:22:11:22:11 | a |
+| struct_init.c:22:8:22:9 | ab [a] | struct_init.c:22:11:22:11 | a |
+| struct_init.c:22:8:22:9 | ab [post update] [a] | struct_init.c:24:10:24:12 | & ... [a] |
+| struct_init.c:22:8:22:9 | ab [post update] [a] | struct_init.c:28:5:28:7 | & ... [a] |
+| struct_init.c:22:11:22:11 | a | realistic.cpp:41:17:41:17 | o |
+| struct_init.c:22:11:22:11 | a | struct_init.c:22:11:22:11 | ref arg a |
+| struct_init.c:22:11:22:11 | ref arg a | struct_init.c:22:8:22:9 | ab [post update] [a] |
 | struct_init.c:24:10:24:12 | & ... [a] | struct_init.c:14:24:14:25 | ab [a] |
+| struct_init.c:24:10:24:12 | & ... [a] | struct_init.c:24:10:24:12 | ref arg & ... [a] |
+| struct_init.c:24:10:24:12 | ref arg & ... [a] | struct_init.c:28:5:28:7 | & ... [a] |
 | struct_init.c:26:23:29:3 | {...} [nestedAB, a] | struct_init.c:31:8:31:12 | outer [nestedAB, a] |
 | struct_init.c:26:23:29:3 | {...} [nestedAB, a] | struct_init.c:36:11:36:15 | outer [nestedAB, a] |
 | struct_init.c:26:23:29:3 | {...} [pointerAB, a] | struct_init.c:33:8:33:12 | outer [pointerAB, a] |
@@ -608,9 +747,16 @@ edges
 | struct_init.c:27:7:27:16 | call to user_input | struct_init.c:27:5:27:23 | {...} [a] |
 | struct_init.c:28:5:28:7 | & ... [a] | struct_init.c:26:23:29:3 | {...} [pointerAB, a] |
 | struct_init.c:31:8:31:12 | outer [nestedAB, a] | struct_init.c:31:14:31:21 | nestedAB [a] |
+| struct_init.c:31:8:31:12 | outer [post update] [nestedAB, a] | struct_init.c:36:11:36:15 | outer [nestedAB, a] |
 | struct_init.c:31:14:31:21 | nestedAB [a] | struct_init.c:31:23:31:23 | a |
+| struct_init.c:31:14:31:21 | nestedAB [a] | struct_init.c:31:23:31:23 | a |
+| struct_init.c:31:14:31:21 | nestedAB [post update] [a] | struct_init.c:31:8:31:12 | outer [post update] [nestedAB, a] |
+| struct_init.c:31:23:31:23 | a | realistic.cpp:41:17:41:17 | o |
+| struct_init.c:31:23:31:23 | a | struct_init.c:31:23:31:23 | ref arg a |
+| struct_init.c:31:23:31:23 | ref arg a | struct_init.c:31:14:31:21 | nestedAB [post update] [a] |
 | struct_init.c:33:8:33:12 | outer [pointerAB, a] | struct_init.c:33:14:33:22 | pointerAB [a] |
 | struct_init.c:33:14:33:22 | pointerAB [a] | struct_init.c:33:25:33:25 | a |
+| struct_init.c:33:25:33:25 | a | realistic.cpp:41:17:41:17 | o |
 | struct_init.c:36:10:36:24 | & ... [a] | struct_init.c:14:24:14:25 | ab [a] |
 | struct_init.c:36:11:36:15 | outer [nestedAB, a] | struct_init.c:36:17:36:24 | nestedAB [a] |
 | struct_init.c:36:17:36:24 | nestedAB [a] | struct_init.c:36:10:36:24 | & ... [a] |
@@ -674,12 +820,14 @@ nodes
 | A.cpp:107:16:107:16 | a | semmle.label | a |
 | A.cpp:120:12:120:13 | c1 [a] | semmle.label | c1 [a] |
 | A.cpp:120:16:120:16 | a | semmle.label | a |
+| A.cpp:124:14:124:14 | b [c] | semmle.label | b [c] |
 | A.cpp:126:5:126:5 | ref arg b [c] | semmle.label | ref arg b [c] |
 | A.cpp:126:12:126:18 | new | semmle.label | new |
 | A.cpp:131:8:131:8 | ref arg b [c] | semmle.label | ref arg b [c] |
 | A.cpp:132:10:132:10 | b [c] | semmle.label | b [c] |
 | A.cpp:132:13:132:13 | c | semmle.label | c |
 | A.cpp:140:13:140:13 | b | semmle.label | b |
+| A.cpp:140:13:140:13 | b [c] | semmle.label | b [c] |
 | A.cpp:142:7:142:7 | b [post update] [c] | semmle.label | b [post update] [c] |
 | A.cpp:142:7:142:20 | ... = ... | semmle.label | ... = ... |
 | A.cpp:142:14:142:20 | new | semmle.label | new |
@@ -695,8 +843,12 @@ nodes
 | A.cpp:151:12:151:24 | call to D [b] | semmle.label | call to D [b] |
 | A.cpp:151:18:151:18 | b | semmle.label | b |
 | A.cpp:151:18:151:18 | ref arg b [c] | semmle.label | ref arg b [c] |
+| A.cpp:152:10:152:10 | d [b, c] | semmle.label | d [b, c] |
 | A.cpp:152:10:152:10 | d [b] | semmle.label | d [b] |
+| A.cpp:152:10:152:10 | d [post update] [b, c] | semmle.label | d [post update] [b, c] |
 | A.cpp:152:13:152:13 | b | semmle.label | b |
+| A.cpp:152:13:152:13 | b [c] | semmle.label | b [c] |
+| A.cpp:152:13:152:13 | ref arg b [c] | semmle.label | ref arg b [c] |
 | A.cpp:153:10:153:10 | d [b, c] | semmle.label | d [b, c] |
 | A.cpp:153:13:153:13 | b [c] | semmle.label | b [c] |
 | A.cpp:153:16:153:16 | c | semmle.label | c |
@@ -710,15 +862,24 @@ nodes
 | A.cpp:162:18:162:40 | call to MyList [next, next, head] | semmle.label | call to MyList [next, next, head] |
 | A.cpp:162:38:162:39 | l2 [next, head] | semmle.label | l2 [next, head] |
 | A.cpp:165:10:165:11 | l3 [next, next, head] | semmle.label | l3 [next, next, head] |
+| A.cpp:165:10:165:11 | l3 [post update] [next, next, head] | semmle.label | l3 [post update] [next, next, head] |
 | A.cpp:165:14:165:17 | next [next, head] | semmle.label | next [next, head] |
+| A.cpp:165:14:165:17 | next [post update] [next, head] | semmle.label | next [post update] [next, head] |
 | A.cpp:165:20:165:23 | next [head] | semmle.label | next [head] |
+| A.cpp:165:20:165:23 | next [post update] [head] | semmle.label | next [post update] [head] |
 | A.cpp:165:26:165:29 | head | semmle.label | head |
+| A.cpp:165:26:165:29 | head | semmle.label | head |
+| A.cpp:165:26:165:29 | ref arg head | semmle.label | ref arg head |
 | A.cpp:167:44:167:44 | l [next, head] | semmle.label | l [next, head] |
 | A.cpp:167:44:167:44 | l [next, next, head] | semmle.label | l [next, next, head] |
 | A.cpp:167:47:167:50 | next [head] | semmle.label | next [head] |
 | A.cpp:167:47:167:50 | next [next, head] | semmle.label | next [next, head] |
 | A.cpp:169:12:169:12 | l [head] | semmle.label | l [head] |
 | A.cpp:169:15:169:18 | head | semmle.label | head |
+| A.cpp:173:26:173:26 | o | semmle.label | o |
+| A.cpp:173:26:173:26 | o | semmle.label | o |
+| A.cpp:173:26:173:26 | o [c] | semmle.label | o [c] |
+| A.cpp:173:26:173:26 | o [c] | semmle.label | o [c] |
 | A.cpp:181:15:181:21 | newHead | semmle.label | newHead |
 | A.cpp:181:32:181:35 | next [head] | semmle.label | next [head] |
 | A.cpp:181:32:181:35 | next [next, head] | semmle.label | next [next, head] |
@@ -829,6 +990,7 @@ nodes
 | E.cpp:32:10:32:10 | b [buffer] | semmle.label | b [buffer] |
 | E.cpp:32:13:32:18 | buffer | semmle.label | buffer |
 | E.cpp:33:18:33:19 | & ... [data, buffer] | semmle.label | & ... [data, buffer] |
+| aliasing.cpp:8:23:8:23 | s [m1] | semmle.label | s [m1] |
 | aliasing.cpp:9:3:9:3 | s [post update] [m1] | semmle.label | s [post update] [m1] |
 | aliasing.cpp:9:3:9:22 | ... = ... | semmle.label | ... = ... |
 | aliasing.cpp:9:11:9:20 | call to user_input | semmle.label | call to user_input |
@@ -854,6 +1016,7 @@ nodes
 | aliasing.cpp:93:8:93:8 | w [s, m1] | semmle.label | w [s, m1] |
 | aliasing.cpp:93:10:93:10 | s [m1] | semmle.label | s [m1] |
 | aliasing.cpp:93:12:93:13 | m1 | semmle.label | m1 |
+| aliasing.cpp:105:23:105:24 | pa | semmle.label | pa |
 | aliasing.cpp:106:4:106:5 | pa [inner post update] | semmle.label | pa [inner post update] |
 | aliasing.cpp:106:9:106:18 | call to user_input | semmle.label | call to user_input |
 | aliasing.cpp:158:15:158:15 | s [post update] [data] | semmle.label | s [post update] [data] |
@@ -902,10 +1065,16 @@ nodes
 | arrays.cpp:36:12:36:14 | arr [inner post update] [data] | semmle.label | arr [inner post update] [data] |
 | arrays.cpp:36:26:36:35 | call to user_input | semmle.label | call to user_input |
 | arrays.cpp:37:8:37:8 | o [nested, arr, data] | semmle.label | o [nested, arr, data] |
+| arrays.cpp:37:8:37:8 | o [post update] [nested, arr, data] | semmle.label | o [post update] [nested, arr, data] |
 | arrays.cpp:37:8:37:22 | access to array [data] | semmle.label | access to array [data] |
+| arrays.cpp:37:8:37:22 | access to array [post update] [data] | semmle.label | access to array [post update] [data] |
 | arrays.cpp:37:10:37:15 | nested [arr, data] | semmle.label | nested [arr, data] |
+| arrays.cpp:37:10:37:15 | nested [post update] [arr, data] | semmle.label | nested [post update] [arr, data] |
 | arrays.cpp:37:17:37:19 | arr [data] | semmle.label | arr [data] |
+| arrays.cpp:37:17:37:19 | arr [inner post update] [data] | semmle.label | arr [inner post update] [data] |
 | arrays.cpp:37:24:37:27 | data | semmle.label | data |
+| arrays.cpp:37:24:37:27 | data | semmle.label | data |
+| arrays.cpp:37:24:37:27 | ref arg data | semmle.label | ref arg data |
 | arrays.cpp:38:8:38:8 | o [nested, arr, data] | semmle.label | o [nested, arr, data] |
 | arrays.cpp:38:8:38:22 | access to array [data] | semmle.label | access to array [data] |
 | arrays.cpp:38:10:38:15 | nested [arr, data] | semmle.label | nested [arr, data] |
@@ -918,15 +1087,22 @@ nodes
 | arrays.cpp:42:15:42:17 | arr [inner post update] [data] | semmle.label | arr [inner post update] [data] |
 | arrays.cpp:42:29:42:38 | call to user_input | semmle.label | call to user_input |
 | arrays.cpp:43:8:43:8 | o [indirect, arr, data] | semmle.label | o [indirect, arr, data] |
+| arrays.cpp:43:8:43:8 | o [post update] [indirect, arr, data] | semmle.label | o [post update] [indirect, arr, data] |
 | arrays.cpp:43:8:43:25 | access to array [data] | semmle.label | access to array [data] |
+| arrays.cpp:43:8:43:25 | access to array [post update] [data] | semmle.label | access to array [post update] [data] |
 | arrays.cpp:43:10:43:17 | indirect [arr, data] | semmle.label | indirect [arr, data] |
+| arrays.cpp:43:10:43:17 | indirect [post update] [arr, data] | semmle.label | indirect [post update] [arr, data] |
 | arrays.cpp:43:20:43:22 | arr [data] | semmle.label | arr [data] |
+| arrays.cpp:43:20:43:22 | arr [inner post update] [data] | semmle.label | arr [inner post update] [data] |
 | arrays.cpp:43:27:43:30 | data | semmle.label | data |
+| arrays.cpp:43:27:43:30 | data | semmle.label | data |
+| arrays.cpp:43:27:43:30 | ref arg data | semmle.label | ref arg data |
 | arrays.cpp:44:8:44:8 | o [indirect, arr, data] | semmle.label | o [indirect, arr, data] |
 | arrays.cpp:44:8:44:25 | access to array [data] | semmle.label | access to array [data] |
 | arrays.cpp:44:10:44:17 | indirect [arr, data] | semmle.label | indirect [arr, data] |
 | arrays.cpp:44:20:44:22 | arr [data] | semmle.label | arr [data] |
 | arrays.cpp:44:27:44:30 | data | semmle.label | data |
+| by_reference.cpp:11:39:11:39 | s [a] | semmle.label | s [a] |
 | by_reference.cpp:11:48:11:52 | value | semmle.label | value |
 | by_reference.cpp:12:5:12:5 | s [post update] [a] | semmle.label | s [post update] [a] |
 | by_reference.cpp:12:5:12:16 | ... = ... | semmle.label | ... = ... |
@@ -967,6 +1143,7 @@ nodes
 | by_reference.cpp:68:21:68:30 | call to user_input | semmle.label | call to user_input |
 | by_reference.cpp:69:8:69:20 | call to nonMemberGetA | semmle.label | call to nonMemberGetA |
 | by_reference.cpp:69:22:69:23 | & ... [a] | semmle.label | & ... [a] |
+| by_reference.cpp:83:31:83:35 | inner [a] | semmle.label | inner [a] |
 | by_reference.cpp:84:3:84:7 | inner [post update] [a] | semmle.label | inner [post update] [a] |
 | by_reference.cpp:84:3:84:25 | ... = ... | semmle.label | ... = ... |
 | by_reference.cpp:84:14:84:23 | call to user_input | semmle.label | call to user_input |
@@ -974,6 +1151,7 @@ nodes
 | by_reference.cpp:88:3:88:7 | inner [post update] [a] | semmle.label | inner [post update] [a] |
 | by_reference.cpp:88:3:88:24 | ... = ... | semmle.label | ... = ... |
 | by_reference.cpp:88:13:88:22 | call to user_input | semmle.label | call to user_input |
+| by_reference.cpp:91:25:91:26 | pa | semmle.label | pa |
 | by_reference.cpp:92:4:92:5 | pa [inner post update] | semmle.label | pa [inner post update] |
 | by_reference.cpp:92:9:92:18 | call to user_input | semmle.label | call to user_input |
 | by_reference.cpp:95:25:95:26 | pa | semmle.label | pa |
@@ -1141,6 +1319,7 @@ nodes
 | qualifiers.cpp:9:21:9:25 | value | semmle.label | value |
 | qualifiers.cpp:9:30:9:33 | this [post update] [a] | semmle.label | this [post update] [a] |
 | qualifiers.cpp:9:30:9:44 | ... = ... | semmle.label | ... = ... |
+| qualifiers.cpp:12:27:12:31 | inner [a] | semmle.label | inner [a] |
 | qualifiers.cpp:12:40:12:44 | value | semmle.label | value |
 | qualifiers.cpp:12:49:12:53 | inner [post update] [a] | semmle.label | inner [post update] [a] |
 | qualifiers.cpp:12:49:12:64 | ... = ... | semmle.label | ... = ... |
@@ -1189,6 +1368,8 @@ nodes
 | qualifiers.cpp:48:10:48:14 | outer [inner, a] | semmle.label | outer [inner, a] |
 | qualifiers.cpp:48:16:48:20 | inner [a] | semmle.label | inner [a] |
 | qualifiers.cpp:48:23:48:23 | a | semmle.label | a |
+| realistic.cpp:41:17:41:17 | o | semmle.label | o |
+| realistic.cpp:41:17:41:17 | o | semmle.label | o |
 | realistic.cpp:53:9:53:11 | foo [post update] [bar, baz, userInput, bufferLen] | semmle.label | foo [post update] [bar, baz, userInput, bufferLen] |
 | realistic.cpp:53:9:53:18 | access to array [post update] [baz, userInput, bufferLen] | semmle.label | access to array [post update] [baz, userInput, bufferLen] |
 | realistic.cpp:53:9:53:66 | ... = ... | semmle.label | ... = ... |
@@ -1197,11 +1378,18 @@ nodes
 | realistic.cpp:53:25:53:33 | userInput [post update] [bufferLen] | semmle.label | userInput [post update] [bufferLen] |
 | realistic.cpp:53:55:53:64 | call to user_input | semmle.label | call to user_input |
 | realistic.cpp:61:21:61:23 | foo [bar, baz, userInput, bufferLen] | semmle.label | foo [bar, baz, userInput, bufferLen] |
+| realistic.cpp:61:21:61:23 | foo [post update] [bar, baz, userInput, bufferLen] | semmle.label | foo [post update] [bar, baz, userInput, bufferLen] |
 | realistic.cpp:61:21:61:30 | access to array [baz, userInput, bufferLen] | semmle.label | access to array [baz, userInput, bufferLen] |
+| realistic.cpp:61:21:61:30 | access to array [post update] [baz, userInput, bufferLen] | semmle.label | access to array [post update] [baz, userInput, bufferLen] |
 | realistic.cpp:61:25:61:27 | bar [baz, userInput, bufferLen] | semmle.label | bar [baz, userInput, bufferLen] |
+| realistic.cpp:61:25:61:27 | bar [inner post update] [baz, userInput, bufferLen] | semmle.label | bar [inner post update] [baz, userInput, bufferLen] |
+| realistic.cpp:61:32:61:34 | baz [post update] [userInput, bufferLen] | semmle.label | baz [post update] [userInput, bufferLen] |
 | realistic.cpp:61:32:61:34 | baz [userInput, bufferLen] | semmle.label | baz [userInput, bufferLen] |
 | realistic.cpp:61:37:61:45 | userInput [bufferLen] | semmle.label | userInput [bufferLen] |
+| realistic.cpp:61:37:61:45 | userInput [post update] [bufferLen] | semmle.label | userInput [post update] [bufferLen] |
 | realistic.cpp:61:47:61:55 | bufferLen | semmle.label | bufferLen |
+| realistic.cpp:61:47:61:55 | bufferLen | semmle.label | bufferLen |
+| realistic.cpp:61:47:61:55 | ref arg bufferLen | semmle.label | ref arg bufferLen |
 | simple.cpp:18:9:18:9 | this [a_] | semmle.label | this [a_] |
 | simple.cpp:18:22:18:23 | a_ | semmle.label | a_ |
 | simple.cpp:18:22:18:23 | this [a_] | semmle.label | this [a_] |
@@ -1253,21 +1441,33 @@ nodes
 | simple.cpp:94:10:94:11 | a2 [i] | semmle.label | a2 [i] |
 | simple.cpp:94:13:94:13 | i | semmle.label | i |
 | struct_init.c:14:24:14:25 | ab [a] | semmle.label | ab [a] |
+| struct_init.c:14:24:14:25 | ab [a] | semmle.label | ab [a] |
 | struct_init.c:15:8:15:9 | ab [a] | semmle.label | ab [a] |
+| struct_init.c:15:8:15:9 | ab [post update] [a] | semmle.label | ab [post update] [a] |
 | struct_init.c:15:12:15:12 | a | semmle.label | a |
+| struct_init.c:15:12:15:12 | a | semmle.label | a |
+| struct_init.c:15:12:15:12 | ref arg a | semmle.label | ref arg a |
 | struct_init.c:20:17:20:36 | {...} [a] | semmle.label | {...} [a] |
 | struct_init.c:20:20:20:29 | call to user_input | semmle.label | call to user_input |
 | struct_init.c:22:8:22:9 | ab [a] | semmle.label | ab [a] |
+| struct_init.c:22:8:22:9 | ab [post update] [a] | semmle.label | ab [post update] [a] |
 | struct_init.c:22:11:22:11 | a | semmle.label | a |
+| struct_init.c:22:11:22:11 | a | semmle.label | a |
+| struct_init.c:22:11:22:11 | ref arg a | semmle.label | ref arg a |
 | struct_init.c:24:10:24:12 | & ... [a] | semmle.label | & ... [a] |
+| struct_init.c:24:10:24:12 | ref arg & ... [a] | semmle.label | ref arg & ... [a] |
 | struct_init.c:26:23:29:3 | {...} [nestedAB, a] | semmle.label | {...} [nestedAB, a] |
 | struct_init.c:26:23:29:3 | {...} [pointerAB, a] | semmle.label | {...} [pointerAB, a] |
 | struct_init.c:27:5:27:23 | {...} [a] | semmle.label | {...} [a] |
 | struct_init.c:27:7:27:16 | call to user_input | semmle.label | call to user_input |
 | struct_init.c:28:5:28:7 | & ... [a] | semmle.label | & ... [a] |
 | struct_init.c:31:8:31:12 | outer [nestedAB, a] | semmle.label | outer [nestedAB, a] |
+| struct_init.c:31:8:31:12 | outer [post update] [nestedAB, a] | semmle.label | outer [post update] [nestedAB, a] |
 | struct_init.c:31:14:31:21 | nestedAB [a] | semmle.label | nestedAB [a] |
+| struct_init.c:31:14:31:21 | nestedAB [post update] [a] | semmle.label | nestedAB [post update] [a] |
 | struct_init.c:31:23:31:23 | a | semmle.label | a |
+| struct_init.c:31:23:31:23 | a | semmle.label | a |
+| struct_init.c:31:23:31:23 | ref arg a | semmle.label | ref arg a |
 | struct_init.c:33:8:33:12 | outer [pointerAB, a] | semmle.label | outer [pointerAB, a] |
 | struct_init.c:33:14:33:22 | pointerAB [a] | semmle.label | pointerAB [a] |
 | struct_init.c:33:25:33:25 | a | semmle.label | a |
@@ -1293,9 +1493,11 @@ subpaths
 | A.cpp:90:15:90:15 | c | A.cpp:27:17:27:17 | c | A.cpp:27:22:27:25 | this [post update] [c] | A.cpp:90:7:90:8 | ref arg b2 [c] |
 | A.cpp:126:12:126:18 | new | A.cpp:27:17:27:17 | c | A.cpp:27:22:27:25 | this [post update] [c] | A.cpp:126:5:126:5 | ref arg b [c] |
 | A.cpp:151:18:151:18 | b | A.cpp:140:13:140:13 | b | A.cpp:143:7:143:10 | this [post update] [b] | A.cpp:151:12:151:24 | call to D [b] |
+| A.cpp:152:13:152:13 | b [c] | A.cpp:173:26:173:26 | o [c] | A.cpp:173:26:173:26 | o [c] | A.cpp:152:13:152:13 | ref arg b [c] |
 | A.cpp:160:29:160:29 | b | A.cpp:181:15:181:21 | newHead | A.cpp:183:7:183:10 | this [post update] [head] | A.cpp:160:18:160:60 | call to MyList [head] |
 | A.cpp:161:38:161:39 | l1 [head] | A.cpp:181:32:181:35 | next [head] | A.cpp:184:7:184:10 | this [post update] [next, head] | A.cpp:161:18:161:40 | call to MyList [next, head] |
 | A.cpp:162:38:162:39 | l2 [next, head] | A.cpp:181:32:181:35 | next [next, head] | A.cpp:184:7:184:10 | this [post update] [next, next, head] | A.cpp:162:18:162:40 | call to MyList [next, next, head] |
+| A.cpp:165:26:165:29 | head | A.cpp:173:26:173:26 | o | A.cpp:173:26:173:26 | o | A.cpp:165:26:165:29 | ref arg head |
 | B.cpp:7:25:7:25 | e | B.cpp:33:16:33:17 | e1 | B.cpp:35:7:35:10 | this [post update] [elem1] | B.cpp:7:16:7:35 | call to Box1 [elem1] |
 | B.cpp:8:25:8:26 | b1 [elem1] | B.cpp:44:16:44:17 | b1 [elem1] | B.cpp:46:7:46:10 | this [post update] [box1, elem1] | B.cpp:8:16:8:27 | call to Box2 [box1, elem1] |
 | B.cpp:16:37:16:37 | e | B.cpp:33:26:33:27 | e2 | B.cpp:36:7:36:10 | this [post update] [elem2] | B.cpp:16:16:16:38 | call to Box1 [elem2] |
@@ -1304,7 +1506,10 @@ subpaths
 | D.cpp:22:14:22:20 | call to getBox1 [elem] | D.cpp:10:11:10:17 | this [elem] | D.cpp:10:30:10:33 | elem | D.cpp:22:25:22:31 | call to getElem |
 | D.cpp:37:21:37:21 | e | D.cpp:11:24:11:24 | e | D.cpp:11:29:11:32 | this [post update] [elem] | D.cpp:37:8:37:10 | ref arg box [elem] |
 | D.cpp:51:27:51:27 | e | D.cpp:11:24:11:24 | e | D.cpp:11:29:11:32 | this [post update] [elem] | D.cpp:51:8:51:14 | ref arg call to getBox1 [elem] |
+| arrays.cpp:37:24:37:27 | data | realistic.cpp:41:17:41:17 | o | realistic.cpp:41:17:41:17 | o | arrays.cpp:37:24:37:27 | ref arg data |
+| arrays.cpp:43:27:43:30 | data | realistic.cpp:41:17:41:17 | o | realistic.cpp:41:17:41:17 | o | arrays.cpp:43:27:43:30 | ref arg data |
 | by_reference.cpp:20:23:20:27 | value | by_reference.cpp:15:26:15:30 | value | by_reference.cpp:16:5:16:8 | this [post update] [a] | by_reference.cpp:20:5:20:8 | ref arg this [a] |
+| by_reference.cpp:24:25:24:29 | value | by_reference.cpp:11:48:11:52 | value | by_reference.cpp:11:39:11:39 | s [a] | by_reference.cpp:24:19:24:22 | ref arg this [a] |
 | by_reference.cpp:24:25:24:29 | value | by_reference.cpp:11:48:11:52 | value | by_reference.cpp:12:5:12:5 | s [post update] [a] | by_reference.cpp:24:19:24:22 | ref arg this [a] |
 | by_reference.cpp:40:12:40:15 | this [a] | by_reference.cpp:35:9:35:19 | this [a] | by_reference.cpp:36:18:36:18 | a | by_reference.cpp:40:18:40:28 | call to getDirectly |
 | by_reference.cpp:44:26:44:29 | this [a] | by_reference.cpp:31:46:31:46 | s [a] | by_reference.cpp:32:15:32:15 | a | by_reference.cpp:44:12:44:24 | call to nonMemberGetA |
@@ -1314,6 +1519,7 @@ subpaths
 | by_reference.cpp:57:8:57:8 | s [a] | by_reference.cpp:39:9:39:21 | this [a] | by_reference.cpp:40:18:40:28 | call to getDirectly | by_reference.cpp:57:10:57:22 | call to getIndirectly |
 | by_reference.cpp:62:25:62:34 | call to user_input | by_reference.cpp:23:34:23:38 | value | by_reference.cpp:24:19:24:22 | ref arg this [a] | by_reference.cpp:62:3:62:3 | ref arg s [a] |
 | by_reference.cpp:63:8:63:8 | s [a] | by_reference.cpp:43:9:43:27 | this [a] | by_reference.cpp:44:12:44:24 | call to nonMemberGetA | by_reference.cpp:63:10:63:28 | call to getThroughNonMember |
+| by_reference.cpp:68:21:68:30 | call to user_input | by_reference.cpp:11:48:11:52 | value | by_reference.cpp:11:39:11:39 | s [a] | by_reference.cpp:68:17:68:18 | ref arg & ... [a] |
 | by_reference.cpp:68:21:68:30 | call to user_input | by_reference.cpp:11:48:11:52 | value | by_reference.cpp:12:5:12:5 | s [post update] [a] | by_reference.cpp:68:17:68:18 | ref arg & ... [a] |
 | by_reference.cpp:69:22:69:23 | & ... [a] | by_reference.cpp:31:46:31:46 | s [a] | by_reference.cpp:32:15:32:15 | a | by_reference.cpp:69:8:69:20 | call to nonMemberGetA |
 | complex.cpp:42:16:42:16 | f [a_] | complex.cpp:9:7:9:7 | this [a_] | complex.cpp:9:20:9:21 | a_ | complex.cpp:42:18:42:18 | call to a |
@@ -1329,9 +1535,11 @@ subpaths
 | constructors.cpp:36:11:36:20 | call to user_input | constructors.cpp:23:13:23:13 | a | constructors.cpp:23:25:23:29 | constructor init of field a_ [post-this] [a_] | constructors.cpp:36:11:36:37 | call to Foo [a_] |
 | constructors.cpp:36:25:36:34 | call to user_input | constructors.cpp:23:20:23:20 | b | constructors.cpp:23:32:23:36 | constructor init of field b_ [post-this] [b_] | constructors.cpp:36:11:36:37 | call to Foo [b_] |
 | qualifiers.cpp:27:28:27:37 | call to user_input | qualifiers.cpp:9:21:9:25 | value | qualifiers.cpp:9:30:9:33 | this [post update] [a] | qualifiers.cpp:27:11:27:18 | ref arg call to getInner [a] |
+| qualifiers.cpp:32:35:32:44 | call to user_input | qualifiers.cpp:12:40:12:44 | value | qualifiers.cpp:12:27:12:31 | inner [a] | qualifiers.cpp:32:23:32:30 | ref arg call to getInner [a] |
 | qualifiers.cpp:32:35:32:44 | call to user_input | qualifiers.cpp:12:40:12:44 | value | qualifiers.cpp:12:49:12:53 | inner [post update] [a] | qualifiers.cpp:32:23:32:30 | ref arg call to getInner [a] |
 | qualifiers.cpp:37:38:37:47 | call to user_input | qualifiers.cpp:13:42:13:46 | value | qualifiers.cpp:13:29:13:33 | inner [a] | qualifiers.cpp:37:19:37:35 | ref arg * ... [a] |
 | qualifiers.cpp:37:38:37:47 | call to user_input | qualifiers.cpp:13:42:13:46 | value | qualifiers.cpp:13:51:13:55 | inner [post update] [a] | qualifiers.cpp:37:19:37:35 | ref arg * ... [a] |
+| realistic.cpp:61:47:61:55 | bufferLen | realistic.cpp:41:17:41:17 | o | realistic.cpp:41:17:41:17 | o | realistic.cpp:61:47:61:55 | ref arg bufferLen |
 | simple.cpp:28:10:28:10 | f [a_] | simple.cpp:18:9:18:9 | this [a_] | simple.cpp:18:22:18:23 | a_ | simple.cpp:28:12:28:12 | call to a |
 | simple.cpp:29:10:29:10 | f [b_] | simple.cpp:19:9:19:9 | this [b_] | simple.cpp:19:22:19:23 | b_ | simple.cpp:29:12:29:12 | call to b |
 | simple.cpp:39:12:39:21 | call to user_input | simple.cpp:20:19:20:19 | a | simple.cpp:20:24:20:25 | this [post update] [a_] | simple.cpp:39:5:39:5 | ref arg f [a_] |
@@ -1339,6 +1547,10 @@ subpaths
 | simple.cpp:41:12:41:21 | call to user_input | simple.cpp:20:19:20:19 | a | simple.cpp:20:24:20:25 | this [post update] [a_] | simple.cpp:41:5:41:5 | ref arg h [a_] |
 | simple.cpp:42:12:42:21 | call to user_input | simple.cpp:21:19:21:19 | b | simple.cpp:21:24:21:25 | this [post update] [b_] | simple.cpp:42:5:42:5 | ref arg h [b_] |
 | simple.cpp:84:14:84:20 | this [f2, f1] | simple.cpp:78:9:78:15 | this [f2, f1] | simple.cpp:79:19:79:20 | f1 | simple.cpp:84:14:84:20 | call to getf2f1 |
+| struct_init.c:15:12:15:12 | a | realistic.cpp:41:17:41:17 | o | realistic.cpp:41:17:41:17 | o | struct_init.c:15:12:15:12 | ref arg a |
+| struct_init.c:22:11:22:11 | a | realistic.cpp:41:17:41:17 | o | realistic.cpp:41:17:41:17 | o | struct_init.c:22:11:22:11 | ref arg a |
+| struct_init.c:24:10:24:12 | & ... [a] | struct_init.c:14:24:14:25 | ab [a] | struct_init.c:14:24:14:25 | ab [a] | struct_init.c:24:10:24:12 | ref arg & ... [a] |
+| struct_init.c:31:23:31:23 | a | realistic.cpp:41:17:41:17 | o | realistic.cpp:41:17:41:17 | o | struct_init.c:31:23:31:23 | ref arg a |
 #select
 | A.cpp:43:10:43:12 | & ... | A.cpp:41:15:41:21 | new | A.cpp:43:10:43:12 | & ... | & ... flows from $@ | A.cpp:41:15:41:21 | new | new |
 | A.cpp:49:13:49:13 | c | A.cpp:47:12:47:18 | new | A.cpp:49:13:49:13 | c | c flows from $@ | A.cpp:47:12:47:18 | new | new |

cpp/ql/test/library-tests/dataflow/fields/struct_init.c

@@ -12,7 +12,7 @@ struct Outer {
 };
 
 void absink(struct AB *ab) {
-  sink(ab->a); //$ ast,ir=20:20 ast,ir=27:7 ast=40:20 MISSING: ir
+  sink(ab->a); //$ ast,ir=20:20 ast,ir=27:7 ast,ir=40:20
   sink(ab->b); // no flow
 }
 
@@ -30,7 +30,7 @@ int struct_init(void) {
 
   sink(outer.nestedAB.a); //$ ast,ir
   sink(outer.nestedAB.b); // no flow
-  sink(outer.pointerAB->a); //$ ast MISSING: ir
+  sink(outer.pointerAB->a); //$ ast,ir
   sink(outer.pointerAB->b); // no flow
 
   absink(&outer.nestedAB);

cpp/ql/test/library-tests/dataflow/smart-pointers-taint/test.cpp

@@ -21,9 +21,9 @@ void test_unique_ptr_struct() {
 	std::unique_ptr<A> p1(new A{source(), 0});
 	std::unique_ptr<A> p2 = std::make_unique<A>(source(), 0);
 	
-	sink(p1->x); // $ ir MISSING: ast
+	sink(p1->x); // $ MISSING: ast,ir
 	sink(p1->y);
-	sink(p2->x); // $ ir=22:46 MISSING: ast
+	sink(p2->x); // $ MISSING: ast,ir=22:46
 	sink(p2->y);
 }
 

cpp/ql/test/library-tests/dataflow/taint-tests/localTaint.expected

@@ -299,12 +299,15 @@
 | file://:0:0:0:0 | (unnamed parameter 0) | file://:0:0:0:0 | (unnamed parameter 0) |  |
 | file://:0:0:0:0 | (unnamed parameter 0) | file://:0:0:0:0 | (unnamed parameter 0) |  |
 | file://:0:0:0:0 | (unnamed parameter 0) | file://:0:0:0:0 | (unnamed parameter 0) |  |
+| format.cpp:16:21:16:21 | s | format.cpp:16:21:16:21 | s |  |
 | format.cpp:16:21:16:21 | s | format.cpp:22:22:22:22 | s |  |
 | format.cpp:16:31:16:31 | n | format.cpp:22:25:22:25 | n |  |
+| format.cpp:16:46:16:51 | format | format.cpp:16:46:16:51 | format |  |
 | format.cpp:16:46:16:51 | format | format.cpp:22:28:22:33 | format |  |
 | format.cpp:20:10:20:13 | args | format.cpp:22:36:22:39 | args |  |
 | format.cpp:22:12:22:20 | call to vsnprintf | format.cpp:22:3:22:40 | ... = ... |  |
 | format.cpp:22:12:22:20 | call to vsnprintf | format.cpp:25:9:25:14 | result |  |
+| format.cpp:22:22:22:22 | ref arg s | format.cpp:16:21:16:21 | s |  |
 | format.cpp:50:21:50:24 | {...} | format.cpp:51:17:51:22 | buffer |  |
 | format.cpp:50:21:50:24 | {...} | format.cpp:52:8:52:13 | buffer |  |
 | format.cpp:50:23:50:23 | 0 | format.cpp:50:21:50:24 | {...} | TAINT |
@@ -3344,7 +3347,9 @@
 | smart_pointer.cpp:93:8:93:8 | ref arg q | smart_pointer.cpp:94:8:94:8 | q |  |
 | smart_pointer.cpp:94:8:94:8 | q | smart_pointer.cpp:94:9:94:9 | call to operator-> |  |
 | smart_pointer.cpp:94:8:94:8 | ref arg q | smart_pointer.cpp:86:67:86:67 | q |  |
+| smart_pointer.cpp:97:17:97:18 | pa | smart_pointer.cpp:97:17:97:18 | pa |  |
 | smart_pointer.cpp:97:17:97:18 | pa | smart_pointer.cpp:98:5:98:6 | pa |  |
+| smart_pointer.cpp:98:5:98:6 | pa [post update] | smart_pointer.cpp:97:17:97:18 | pa |  |
 | smart_pointer.cpp:98:5:98:20 | ... = ... | smart_pointer.cpp:98:9:98:9 | x [post update] |  |
 | smart_pointer.cpp:98:13:98:18 | call to source | smart_pointer.cpp:98:5:98:20 | ... = ... |  |
 | smart_pointer.cpp:102:25:102:50 | call to unique_ptr | smart_pointer.cpp:103:11:103:11 | p |  |
@@ -5923,11 +5928,13 @@
 | taint.cpp:172:10:172:15 | buffer | taint.cpp:172:10:172:15 | ref arg buffer | TAINT |
 | taint.cpp:172:10:172:15 | ref arg buffer | taint.cpp:173:8:173:13 | buffer |  |
 | taint.cpp:172:18:172:24 | tainted | taint.cpp:172:10:172:15 | ref arg buffer | TAINT |
+| taint.cpp:180:19:180:19 | p | taint.cpp:180:19:180:19 | p |  |
 | taint.cpp:180:19:180:19 | p | taint.cpp:181:9:181:9 | p |  |
 | taint.cpp:181:9:181:9 | p | taint.cpp:181:8:181:9 | * ... | TAINT |
 | taint.cpp:185:11:185:16 | call to source | taint.cpp:186:11:186:11 | x |  |
 | taint.cpp:186:10:186:11 | ref arg & ... | taint.cpp:186:11:186:11 | x [inner post update] |  |
 | taint.cpp:186:11:186:11 | x | taint.cpp:186:10:186:11 | & ... |  |
+| taint.cpp:192:23:192:28 | source | taint.cpp:192:23:192:28 | source |  |
 | taint.cpp:192:23:192:28 | source | taint.cpp:194:13:194:18 | source |  |
 | taint.cpp:193:6:193:6 | x | taint.cpp:194:10:194:10 | x |  |
 | taint.cpp:193:6:193:6 | x | taint.cpp:195:7:195:7 | x |  |
@@ -5935,6 +5942,7 @@
 | taint.cpp:194:9:194:10 | ref arg & ... | taint.cpp:194:10:194:10 | x [inner post update] |  |
 | taint.cpp:194:9:194:10 | ref arg & ... | taint.cpp:195:7:195:7 | x |  |
 | taint.cpp:194:10:194:10 | x | taint.cpp:194:9:194:10 | & ... |  |
+| taint.cpp:194:13:194:18 | ref arg source | taint.cpp:192:23:192:28 | source |  |
 | taint.cpp:194:13:194:18 | source | taint.cpp:194:2:194:7 | call to memcpy | TAINT |
 | taint.cpp:194:13:194:18 | source | taint.cpp:194:9:194:10 | ref arg & ... | TAINT |
 | taint.cpp:207:6:207:11 | call to source | taint.cpp:207:2:207:13 | ... = ... |  |
@@ -6040,18 +6048,22 @@
 | taint.cpp:304:2:304:6 | ... = ... | taint.cpp:304:2:304:2 | a [post update] |  |
 | taint.cpp:304:6:304:6 | b | taint.cpp:302:21:302:21 | a |  |
 | taint.cpp:304:6:304:6 | b | taint.cpp:304:2:304:6 | ... = ... |  |
+| taint.cpp:307:21:307:21 | a | taint.cpp:307:21:307:21 | a |  |
 | taint.cpp:307:21:307:21 | a | taint.cpp:309:3:309:3 | a |  |
 | taint.cpp:307:28:307:28 | b | taint.cpp:309:7:309:7 | b |  |
+| taint.cpp:309:2:309:3 | * ... [post update] | taint.cpp:307:21:307:21 | a |  |
 | taint.cpp:309:2:309:3 | * ... [post update] | taint.cpp:309:3:309:3 | a [inner post update] |  |
 | taint.cpp:309:2:309:7 | ... = ... | taint.cpp:309:2:309:3 | * ... [post update] |  |
 | taint.cpp:309:3:309:3 | a | taint.cpp:309:2:309:3 | * ... | TAINT |
 | taint.cpp:309:7:309:7 | b | taint.cpp:309:2:309:7 | ... = ... |  |
+| taint.cpp:312:21:312:21 | a | taint.cpp:312:21:312:21 | a |  |
 | taint.cpp:312:21:312:21 | a | taint.cpp:317:3:317:3 | a |  |
 | taint.cpp:312:28:312:28 | b | taint.cpp:316:6:316:6 | b |  |
 | taint.cpp:316:6:316:6 | b | taint.cpp:316:6:316:10 | ... + ... | TAINT |
 | taint.cpp:316:6:316:10 | ... + ... | taint.cpp:316:2:316:10 | ... = ... |  |
 | taint.cpp:316:6:316:10 | ... + ... | taint.cpp:317:7:317:7 | c |  |
 | taint.cpp:316:10:316:10 | 1 | taint.cpp:316:6:316:10 | ... + ... | TAINT |
+| taint.cpp:317:2:317:3 | * ... [post update] | taint.cpp:312:21:312:21 | a |  |
 | taint.cpp:317:2:317:3 | * ... [post update] | taint.cpp:317:3:317:3 | a [inner post update] |  |
 | taint.cpp:317:2:317:7 | ... = ... | taint.cpp:317:2:317:3 | * ... [post update] |  |
 | taint.cpp:317:3:317:3 | a | taint.cpp:317:2:317:3 | * ... | TAINT |
@@ -6113,6 +6125,7 @@
 | taint.cpp:347:13:347:13 | d | taint.cpp:347:12:347:13 | & ... |  |
 | taint.cpp:348:14:348:14 | ref arg e | taint.cpp:355:7:355:7 | e |  |
 | taint.cpp:348:17:348:17 | ref arg t | taint.cpp:350:7:350:7 | t |  |
+| taint.cpp:367:24:367:29 | source | taint.cpp:367:24:367:29 | source |  |
 | taint.cpp:367:24:367:29 | source | taint.cpp:371:13:371:18 | source |  |
 | taint.cpp:367:24:367:29 | source | taint.cpp:373:14:373:19 | source |  |
 | taint.cpp:371:6:371:11 | call to strdup | taint.cpp:371:2:371:19 | ... = ... |  |
@@ -6130,6 +6143,7 @@
 | taint.cpp:383:6:383:12 | call to strndup | taint.cpp:384:7:384:7 | a |  |
 | taint.cpp:383:14:383:27 | hello, world | taint.cpp:383:6:383:12 | call to strndup | TAINT |
 | taint.cpp:383:30:383:35 | source | taint.cpp:383:6:383:12 | call to strndup | TAINT |
+| taint.cpp:387:27:387:32 | source | taint.cpp:387:27:387:32 | source |  |
 | taint.cpp:387:27:387:32 | source | taint.cpp:391:13:391:18 | source |  |
 | taint.cpp:391:6:391:11 | call to wcsdup | taint.cpp:391:2:391:19 | ... = ... |  |
 | taint.cpp:391:6:391:11 | call to wcsdup | taint.cpp:393:7:393:7 | a |  |
@@ -6137,6 +6151,7 @@
 | taint.cpp:392:6:392:11 | call to wcsdup | taint.cpp:392:2:392:28 | ... = ... |  |
 | taint.cpp:392:6:392:11 | call to wcsdup | taint.cpp:394:7:394:7 | b |  |
 | taint.cpp:392:13:392:27 | hello, world | taint.cpp:392:6:392:11 | call to wcsdup | TAINT |
+| taint.cpp:397:25:397:30 | source | taint.cpp:397:25:397:30 | source |  |
 | taint.cpp:397:25:397:30 | source | taint.cpp:401:14:401:19 | source |  |
 | taint.cpp:397:25:397:30 | source | taint.cpp:403:15:403:20 | source |  |
 | taint.cpp:401:6:401:12 | call to strdupa | taint.cpp:401:2:401:20 | ... = ... |  |
@@ -6239,6 +6254,7 @@
 | taint.cpp:485:6:485:6 | 0 | taint.cpp:493:7:493:7 | y |  |
 | taint.cpp:490:7:490:7 | ref arg x | taint.cpp:492:7:492:7 | x |  |
 | taint.cpp:490:10:490:10 | ref arg y | taint.cpp:493:7:493:7 | y |  |
+| taint.cpp:502:26:502:32 | source1 | taint.cpp:502:26:502:32 | source1 |  |
 | taint.cpp:502:26:502:32 | source1 | taint.cpp:505:28:505:34 | source1 |  |
 | taint.cpp:503:15:503:21 | 0 | taint.cpp:505:12:505:15 | line |  |
 | taint.cpp:503:15:503:21 | 0 | taint.cpp:507:7:507:10 | line |  |
@@ -6248,29 +6264,39 @@
 | taint.cpp:505:12:505:15 | line | taint.cpp:505:11:505:15 | & ... |  |
 | taint.cpp:505:18:505:19 | ref arg & ... | taint.cpp:505:19:505:19 | n [inner post update] |  |
 | taint.cpp:505:19:505:19 | n | taint.cpp:505:18:505:19 | & ... |  |
+| taint.cpp:505:28:505:34 | ref arg source1 | taint.cpp:502:26:502:32 | source1 |  |
 | taint.cpp:505:28:505:34 | source1 | taint.cpp:505:11:505:15 | ref arg & ... | TAINT |
+| taint.cpp:514:24:514:29 | source | taint.cpp:514:24:514:29 | source |  |
 | taint.cpp:514:24:514:29 | source | taint.cpp:516:27:516:32 | source |  |
 | taint.cpp:515:22:515:29 | ,.-;:_ | taint.cpp:516:35:516:39 | delim |  |
 | taint.cpp:515:22:515:29 | ,.-;:_ | taint.cpp:518:7:518:11 | delim |  |
 | taint.cpp:516:20:516:25 | call to strtok | taint.cpp:517:7:517:15 | tokenized |  |
+| taint.cpp:516:27:516:32 | ref arg source | taint.cpp:514:24:514:29 | source |  |
 | taint.cpp:516:27:516:32 | source | taint.cpp:516:20:516:25 | call to strtok | TAINT |
+| taint.cpp:525:26:525:28 | ptr | taint.cpp:525:26:525:28 | ptr |  |
 | taint.cpp:525:26:525:28 | ptr | taint.cpp:526:10:526:12 | ptr |  |
 | taint.cpp:525:26:525:28 | ptr | taint.cpp:527:7:527:9 | ptr |  |
 | taint.cpp:525:26:525:28 | ptr | taint.cpp:528:8:528:10 | ptr |  |
 | taint.cpp:525:36:525:41 | source | taint.cpp:526:15:526:20 | source |  |
 | taint.cpp:526:10:526:12 | ptr | taint.cpp:526:2:526:8 | call to _strset |  |
+| taint.cpp:526:10:526:12 | ref arg ptr | taint.cpp:525:26:525:28 | ptr |  |
 | taint.cpp:526:10:526:12 | ref arg ptr | taint.cpp:527:7:527:9 | ptr |  |
 | taint.cpp:526:10:526:12 | ref arg ptr | taint.cpp:528:8:528:10 | ptr |  |
 | taint.cpp:526:15:526:20 | source | taint.cpp:526:2:526:8 | call to _strset | TAINT |
 | taint.cpp:526:15:526:20 | source | taint.cpp:526:10:526:12 | ref arg ptr |  |
+| taint.cpp:527:7:527:9 | ref arg ptr | taint.cpp:525:26:525:28 | ptr |  |
 | taint.cpp:527:7:527:9 | ref arg ptr | taint.cpp:528:8:528:10 | ptr |  |
 | taint.cpp:528:8:528:10 | ptr | taint.cpp:528:7:528:10 | * ... | TAINT |
+| taint.cpp:531:26:531:31 | source | taint.cpp:531:26:531:31 | source |  |
 | taint.cpp:531:26:531:31 | source | taint.cpp:532:10:532:15 | source |  |
 | taint.cpp:531:26:531:31 | source | taint.cpp:533:7:533:12 | source |  |
+| taint.cpp:532:10:532:15 | ref arg source | taint.cpp:531:26:531:31 | source |  |
 | taint.cpp:532:10:532:15 | ref arg source | taint.cpp:533:7:533:12 | source |  |
 | taint.cpp:532:10:532:15 | source | taint.cpp:532:2:532:8 | call to _strset |  |
 | taint.cpp:532:18:532:18 | 0 | taint.cpp:532:2:532:8 | call to _strset | TAINT |
 | taint.cpp:532:18:532:18 | 0 | taint.cpp:532:10:532:15 | ref arg source |  |
+| taint.cpp:533:7:533:12 | ref arg source | taint.cpp:531:26:531:31 | source |  |
+| taint.cpp:540:24:540:29 | source | taint.cpp:540:24:540:29 | source |  |
 | taint.cpp:540:24:540:29 | source | taint.cpp:542:14:542:19 | source |  |
 | taint.cpp:541:6:541:6 | x | taint.cpp:542:11:542:11 | x |  |
 | taint.cpp:541:6:541:6 | x | taint.cpp:543:7:543:7 | x |  |
@@ -6280,6 +6306,7 @@
 | taint.cpp:542:11:542:11 | x | taint.cpp:542:10:542:11 | & ... |  |
 | taint.cpp:542:14:542:19 | source | taint.cpp:542:2:542:8 | call to mempcpy | TAINT |
 | taint.cpp:542:14:542:19 | source | taint.cpp:542:10:542:11 | ref arg & ... | TAINT |
+| taint.cpp:550:24:550:29 | source | taint.cpp:550:24:550:29 | source |  |
 | taint.cpp:550:24:550:29 | source | taint.cpp:552:16:552:21 | source |  |
 | taint.cpp:551:6:551:9 | dest | taint.cpp:552:10:552:13 | dest |  |
 | taint.cpp:551:6:551:9 | dest | taint.cpp:552:35:552:38 | dest |  |
@@ -6288,29 +6315,42 @@
 | taint.cpp:552:10:552:13 | ref arg dest | taint.cpp:553:7:553:10 | dest |  |
 | taint.cpp:552:16:552:21 | source | taint.cpp:552:2:552:8 | call to memccpy | TAINT |
 | taint.cpp:552:16:552:21 | source | taint.cpp:552:10:552:13 | ref arg dest | TAINT |
+| taint.cpp:560:24:560:28 | dest1 | taint.cpp:560:24:560:28 | dest1 |  |
 | taint.cpp:560:24:560:28 | dest1 | taint.cpp:561:9:561:13 | dest1 |  |
 | taint.cpp:560:24:560:28 | dest1 | taint.cpp:562:7:562:11 | dest1 |  |
+| taint.cpp:560:37:560:41 | dest2 | taint.cpp:560:37:560:41 | dest2 |  |
 | taint.cpp:560:37:560:41 | dest2 | taint.cpp:564:9:564:13 | dest2 |  |
 | taint.cpp:560:37:560:41 | dest2 | taint.cpp:565:7:565:11 | dest2 |  |
+| taint.cpp:560:50:560:54 | clean | taint.cpp:560:50:560:54 | clean |  |
 | taint.cpp:560:50:560:54 | clean | taint.cpp:564:16:564:20 | clean |  |
+| taint.cpp:560:63:560:68 | source | taint.cpp:560:63:560:68 | source |  |
 | taint.cpp:560:63:560:68 | source | taint.cpp:561:16:561:21 | source |  |
 | taint.cpp:561:9:561:13 | dest1 | taint.cpp:561:2:561:7 | call to strcat |  |
 | taint.cpp:561:9:561:13 | dest1 | taint.cpp:561:9:561:13 | ref arg dest1 | TAINT |
+| taint.cpp:561:9:561:13 | ref arg dest1 | taint.cpp:560:24:560:28 | dest1 |  |
 | taint.cpp:561:9:561:13 | ref arg dest1 | taint.cpp:562:7:562:11 | dest1 |  |
 | taint.cpp:561:16:561:21 | source | taint.cpp:561:9:561:13 | ref arg dest1 | TAINT |
+| taint.cpp:562:7:562:11 | ref arg dest1 | taint.cpp:560:24:560:28 | dest1 |  |
 | taint.cpp:564:9:564:13 | dest2 | taint.cpp:564:2:564:7 | call to strcat |  |
 | taint.cpp:564:9:564:13 | dest2 | taint.cpp:564:9:564:13 | ref arg dest2 | TAINT |
+| taint.cpp:564:9:564:13 | ref arg dest2 | taint.cpp:560:37:560:41 | dest2 |  |
 | taint.cpp:564:9:564:13 | ref arg dest2 | taint.cpp:565:7:565:11 | dest2 |  |
 | taint.cpp:564:16:564:20 | clean | taint.cpp:564:9:564:13 | ref arg dest2 | TAINT |
+| taint.cpp:565:7:565:11 | ref arg dest2 | taint.cpp:560:37:560:41 | dest2 |  |
+| taint.cpp:572:37:572:41 | dest1 | taint.cpp:572:37:572:41 | dest1 |  |
 | taint.cpp:572:37:572:41 | dest1 | taint.cpp:574:36:574:40 | dest1 |  |
 | taint.cpp:572:37:572:41 | dest1 | taint.cpp:575:7:575:11 | dest1 |  |
 | taint.cpp:572:37:572:41 | dest1 | taint.cpp:576:8:576:12 | dest1 |  |
+| taint.cpp:572:65:572:67 | ptr | taint.cpp:572:65:572:67 | ptr |  |
 | taint.cpp:572:65:572:67 | ptr | taint.cpp:574:43:574:45 | ptr |  |
 | taint.cpp:572:65:572:67 | ptr | taint.cpp:580:43:580:45 | ptr |  |
+| taint.cpp:572:85:572:89 | dest3 | taint.cpp:572:85:572:89 | dest3 |  |
 | taint.cpp:572:85:572:89 | dest3 | taint.cpp:580:36:580:40 | dest3 |  |
 | taint.cpp:572:85:572:89 | dest3 | taint.cpp:581:7:581:11 | dest3 |  |
 | taint.cpp:572:85:572:89 | dest3 | taint.cpp:582:8:582:12 | dest3 |  |
+| taint.cpp:573:32:573:36 | clean | taint.cpp:573:32:573:36 | clean |  |
 | taint.cpp:573:32:573:36 | clean | taint.cpp:580:51:580:55 | clean |  |
+| taint.cpp:573:49:573:54 | source | taint.cpp:573:49:573:54 | source |  |
 | taint.cpp:573:49:573:54 | source | taint.cpp:574:51:574:56 | source |  |
 | taint.cpp:573:61:573:61 | n | taint.cpp:574:48:574:48 | n |  |
 | taint.cpp:573:61:573:61 | n | taint.cpp:580:48:580:48 | n |  |
@@ -6318,11 +6358,14 @@
 | taint.cpp:574:25:574:34 | call to _mbsncat_l | taint.cpp:578:8:578:12 | dest2 |  |
 | taint.cpp:574:36:574:40 | dest1 | taint.cpp:574:25:574:34 | call to _mbsncat_l |  |
 | taint.cpp:574:36:574:40 | dest1 | taint.cpp:574:36:574:40 | ref arg dest1 | TAINT |
+| taint.cpp:574:36:574:40 | ref arg dest1 | taint.cpp:572:37:572:41 | dest1 |  |
 | taint.cpp:574:36:574:40 | ref arg dest1 | taint.cpp:575:7:575:11 | dest1 |  |
 | taint.cpp:574:36:574:40 | ref arg dest1 | taint.cpp:576:8:576:12 | dest1 |  |
 | taint.cpp:574:43:574:45 | ptr | taint.cpp:574:36:574:40 | ref arg dest1 | TAINT |
 | taint.cpp:574:48:574:48 | n | taint.cpp:574:36:574:40 | ref arg dest1 | TAINT |
+| taint.cpp:574:51:574:56 | ref arg source | taint.cpp:573:49:573:54 | source |  |
 | taint.cpp:574:51:574:56 | source | taint.cpp:574:36:574:40 | ref arg dest1 | TAINT |
+| taint.cpp:575:7:575:11 | ref arg dest1 | taint.cpp:572:37:572:41 | dest1 |  |
 | taint.cpp:575:7:575:11 | ref arg dest1 | taint.cpp:576:8:576:12 | dest1 |  |
 | taint.cpp:576:8:576:12 | dest1 | taint.cpp:576:7:576:12 | * ... | TAINT |
 | taint.cpp:577:7:577:11 | ref arg dest2 | taint.cpp:578:8:578:12 | dest2 |  |
@@ -6331,15 +6374,19 @@
 | taint.cpp:580:25:580:34 | call to _mbsncat_l | taint.cpp:584:8:584:12 | dest4 |  |
 | taint.cpp:580:36:580:40 | dest3 | taint.cpp:580:25:580:34 | call to _mbsncat_l |  |
 | taint.cpp:580:36:580:40 | dest3 | taint.cpp:580:36:580:40 | ref arg dest3 | TAINT |
+| taint.cpp:580:36:580:40 | ref arg dest3 | taint.cpp:572:85:572:89 | dest3 |  |
 | taint.cpp:580:36:580:40 | ref arg dest3 | taint.cpp:581:7:581:11 | dest3 |  |
 | taint.cpp:580:36:580:40 | ref arg dest3 | taint.cpp:582:8:582:12 | dest3 |  |
 | taint.cpp:580:43:580:45 | ptr | taint.cpp:580:36:580:40 | ref arg dest3 | TAINT |
 | taint.cpp:580:48:580:48 | n | taint.cpp:580:36:580:40 | ref arg dest3 | TAINT |
 | taint.cpp:580:51:580:55 | clean | taint.cpp:580:36:580:40 | ref arg dest3 | TAINT |
+| taint.cpp:580:51:580:55 | ref arg clean | taint.cpp:573:32:573:36 | clean |  |
+| taint.cpp:581:7:581:11 | ref arg dest3 | taint.cpp:572:85:572:89 | dest3 |  |
 | taint.cpp:581:7:581:11 | ref arg dest3 | taint.cpp:582:8:582:12 | dest3 |  |
 | taint.cpp:582:8:582:12 | dest3 | taint.cpp:582:7:582:12 | * ... | TAINT |
 | taint.cpp:583:7:583:11 | ref arg dest4 | taint.cpp:584:8:584:12 | dest4 |  |
 | taint.cpp:584:8:584:12 | dest4 | taint.cpp:584:7:584:12 | * ... | TAINT |
+| taint.cpp:591:24:591:29 | source | taint.cpp:591:24:591:29 | source |  |
 | taint.cpp:591:24:591:29 | source | taint.cpp:594:29:594:34 | source |  |
 | taint.cpp:592:23:592:30 | ,.-;:_ | taint.cpp:594:37:594:41 | delim |  |
 | taint.cpp:594:9:594:17 | tokenized | taint.cpp:594:9:594:42 | ... = ... |  |
@@ -6347,6 +6394,7 @@
 | taint.cpp:594:21:594:26 | call to strsep | taint.cpp:595:10:595:18 | tokenized |  |
 | taint.cpp:594:21:594:26 | call to strsep | taint.cpp:596:11:596:19 | tokenized |  |
 | taint.cpp:594:28:594:34 | & ... | taint.cpp:594:21:594:26 | call to strsep | TAINT |
+| taint.cpp:594:28:594:34 | ref arg & ... | taint.cpp:591:24:591:29 | source |  |
 | taint.cpp:594:28:594:34 | ref arg & ... | taint.cpp:594:29:594:34 | source |  |
 | taint.cpp:594:28:594:34 | ref arg & ... | taint.cpp:594:29:594:34 | source [inner post update] |  |
 | taint.cpp:594:29:594:34 | source | taint.cpp:594:21:594:26 | call to strsep | TAINT |
@@ -6354,45 +6402,63 @@
 | taint.cpp:594:37:594:41 | delim | taint.cpp:594:21:594:26 | call to strsep | TAINT |
 | taint.cpp:595:10:595:18 | ref arg tokenized | taint.cpp:596:11:596:19 | tokenized |  |
 | taint.cpp:596:11:596:19 | tokenized | taint.cpp:596:10:596:19 | * ... | TAINT |
+| taint.cpp:606:25:606:30 | source | taint.cpp:606:25:606:30 | source |  |
 | taint.cpp:606:25:606:30 | source | taint.cpp:607:18:607:23 | source |  |
+| taint.cpp:606:39:606:43 | clean | taint.cpp:606:39:606:43 | clean |  |
 | taint.cpp:606:39:606:43 | clean | taint.cpp:611:18:611:22 | clean |  |
+| taint.cpp:606:82:606:87 | locale | taint.cpp:606:82:606:87 | locale |  |
 | taint.cpp:606:82:606:87 | locale | taint.cpp:607:26:607:31 | locale |  |
 | taint.cpp:606:82:606:87 | locale | taint.cpp:611:25:611:30 | locale |  |
+| taint.cpp:607:10:607:16 | call to _strinc | taint.cpp:606:52:606:56 | dest1 |  |
 | taint.cpp:607:10:607:16 | call to _strinc | taint.cpp:607:2:607:32 | ... = ... |  |
 | taint.cpp:607:10:607:16 | call to _strinc | taint.cpp:608:7:608:11 | dest1 |  |
 | taint.cpp:607:10:607:16 | call to _strinc | taint.cpp:609:8:609:12 | dest1 |  |
 | taint.cpp:607:18:607:23 | source | taint.cpp:607:10:607:16 | call to _strinc | TAINT |
 | taint.cpp:607:26:607:31 | locale | taint.cpp:607:10:607:16 | call to _strinc | TAINT |
+| taint.cpp:607:26:607:31 | ref arg locale | taint.cpp:606:82:606:87 | locale |  |
 | taint.cpp:607:26:607:31 | ref arg locale | taint.cpp:611:25:611:30 | locale |  |
+| taint.cpp:608:7:608:11 | ref arg dest1 | taint.cpp:606:52:606:56 | dest1 |  |
 | taint.cpp:608:7:608:11 | ref arg dest1 | taint.cpp:609:8:609:12 | dest1 |  |
 | taint.cpp:609:8:609:12 | dest1 | taint.cpp:609:7:609:12 | * ... | TAINT |
+| taint.cpp:611:10:611:16 | call to _strinc | taint.cpp:606:65:606:69 | dest2 |  |
 | taint.cpp:611:10:611:16 | call to _strinc | taint.cpp:611:2:611:31 | ... = ... |  |
 | taint.cpp:611:10:611:16 | call to _strinc | taint.cpp:612:7:612:11 | dest2 |  |
 | taint.cpp:611:10:611:16 | call to _strinc | taint.cpp:613:8:613:12 | dest2 |  |
 | taint.cpp:611:18:611:22 | clean | taint.cpp:611:10:611:16 | call to _strinc | TAINT |
 | taint.cpp:611:25:611:30 | locale | taint.cpp:611:10:611:16 | call to _strinc | TAINT |
+| taint.cpp:611:25:611:30 | ref arg locale | taint.cpp:606:82:606:87 | locale |  |
+| taint.cpp:612:7:612:11 | ref arg dest2 | taint.cpp:606:65:606:69 | dest2 |  |
 | taint.cpp:612:7:612:11 | ref arg dest2 | taint.cpp:613:8:613:12 | dest2 |  |
 | taint.cpp:613:8:613:12 | dest2 | taint.cpp:613:7:613:12 | * ... | TAINT |
+| taint.cpp:616:34:616:48 | source_unsigned | taint.cpp:616:34:616:48 | source_unsigned |  |
 | taint.cpp:616:34:616:48 | source_unsigned | taint.cpp:617:26:617:40 | source_unsigned |  |
+| taint.cpp:616:57:616:62 | source | taint.cpp:616:57:616:62 | source |  |
 | taint.cpp:616:57:616:62 | source | taint.cpp:621:40:621:45 | source |  |
+| taint.cpp:617:18:617:24 | call to _mbsinc | taint.cpp:616:80:616:92 | dest_unsigned |  |
 | taint.cpp:617:18:617:24 | call to _mbsinc | taint.cpp:617:2:617:41 | ... = ... |  |
 | taint.cpp:617:18:617:24 | call to _mbsinc | taint.cpp:618:7:618:19 | dest_unsigned |  |
 | taint.cpp:617:18:617:24 | call to _mbsinc | taint.cpp:619:8:619:20 | dest_unsigned |  |
 | taint.cpp:617:26:617:40 | source_unsigned | taint.cpp:617:18:617:24 | call to _mbsinc | TAINT |
+| taint.cpp:618:7:618:19 | ref arg dest_unsigned | taint.cpp:616:80:616:92 | dest_unsigned |  |
 | taint.cpp:618:7:618:19 | ref arg dest_unsigned | taint.cpp:619:8:619:20 | dest_unsigned |  |
 | taint.cpp:619:8:619:20 | dest_unsigned | taint.cpp:619:7:619:20 | * ... | TAINT |
+| taint.cpp:621:16:621:22 | call to _mbsinc | taint.cpp:616:101:616:104 | dest |  |
 | taint.cpp:621:16:621:22 | call to _mbsinc | taint.cpp:621:2:621:46 | ... = ... |  |
 | taint.cpp:621:16:621:22 | call to _mbsinc | taint.cpp:622:7:622:10 | dest |  |
 | taint.cpp:621:16:621:22 | call to _mbsinc | taint.cpp:623:8:623:11 | dest |  |
 | taint.cpp:621:40:621:45 | source | taint.cpp:621:16:621:22 | call to _mbsinc | TAINT |
+| taint.cpp:622:7:622:10 | ref arg dest | taint.cpp:616:101:616:104 | dest |  |
 | taint.cpp:622:7:622:10 | ref arg dest | taint.cpp:623:8:623:11 | dest |  |
 | taint.cpp:623:8:623:11 | dest | taint.cpp:623:7:623:11 | * ... | TAINT |
+| taint.cpp:626:40:626:45 | source | taint.cpp:626:40:626:45 | source |  |
 | taint.cpp:626:40:626:45 | source | taint.cpp:627:18:627:23 | source |  |
 | taint.cpp:626:40:626:45 | source | taint.cpp:627:31:627:36 | source |  |
 | taint.cpp:626:40:626:45 | source | taint.cpp:633:25:633:30 | source |  |
 | taint.cpp:626:40:626:45 | source | taint.cpp:638:18:638:23 | source |  |
+| taint.cpp:626:63:626:67 | clean | taint.cpp:626:63:626:67 | clean |  |
 | taint.cpp:626:63:626:67 | clean | taint.cpp:633:18:633:22 | clean |  |
 | taint.cpp:626:63:626:67 | clean | taint.cpp:638:26:638:30 | clean |  |
+| taint.cpp:627:10:627:16 | call to _strdec | taint.cpp:626:85:626:89 | dest1 |  |
 | taint.cpp:627:10:627:16 | call to _strdec | taint.cpp:627:2:627:37 | ... = ... |  |
 | taint.cpp:627:10:627:16 | call to _strdec | taint.cpp:628:7:628:11 | dest1 |  |
 | taint.cpp:627:10:627:16 | call to _strdec | taint.cpp:629:8:629:12 | dest1 |  |
@@ -6400,20 +6466,25 @@
 | taint.cpp:627:18:627:28 | ... + ... | taint.cpp:627:10:627:16 | call to _strdec | TAINT |
 | taint.cpp:627:27:627:28 | 12 | taint.cpp:627:18:627:28 | ... + ... | TAINT |
 | taint.cpp:627:31:627:36 | source | taint.cpp:627:10:627:16 | call to _strdec | TAINT |
+| taint.cpp:628:7:628:11 | ref arg dest1 | taint.cpp:626:85:626:89 | dest1 |  |
 | taint.cpp:628:7:628:11 | ref arg dest1 | taint.cpp:629:8:629:12 | dest1 |  |
 | taint.cpp:629:8:629:12 | dest1 | taint.cpp:629:7:629:12 | * ... | TAINT |
+| taint.cpp:633:10:633:16 | call to _strdec | taint.cpp:626:107:626:111 | dest2 |  |
 | taint.cpp:633:10:633:16 | call to _strdec | taint.cpp:633:2:633:31 | ... = ... |  |
 | taint.cpp:633:10:633:16 | call to _strdec | taint.cpp:634:7:634:11 | dest2 |  |
 | taint.cpp:633:10:633:16 | call to _strdec | taint.cpp:635:8:635:12 | dest2 |  |
 | taint.cpp:633:18:633:22 | clean | taint.cpp:633:10:633:16 | call to _strdec | TAINT |
 | taint.cpp:633:25:633:30 | source | taint.cpp:633:10:633:16 | call to _strdec | TAINT |
+| taint.cpp:634:7:634:11 | ref arg dest2 | taint.cpp:626:107:626:111 | dest2 |  |
 | taint.cpp:634:7:634:11 | ref arg dest2 | taint.cpp:635:8:635:12 | dest2 |  |
 | taint.cpp:635:8:635:12 | dest2 | taint.cpp:635:7:635:12 | * ... | TAINT |
+| taint.cpp:638:10:638:16 | call to _strdec | taint.cpp:626:129:626:133 | dest3 |  |
 | taint.cpp:638:10:638:16 | call to _strdec | taint.cpp:638:2:638:31 | ... = ... |  |
 | taint.cpp:638:10:638:16 | call to _strdec | taint.cpp:639:7:639:11 | dest3 |  |
 | taint.cpp:638:10:638:16 | call to _strdec | taint.cpp:640:8:640:12 | dest3 |  |
 | taint.cpp:638:18:638:23 | source | taint.cpp:638:10:638:16 | call to _strdec | TAINT |
 | taint.cpp:638:26:638:30 | clean | taint.cpp:638:10:638:16 | call to _strdec | TAINT |
+| taint.cpp:639:7:639:11 | ref arg dest3 | taint.cpp:626:129:626:133 | dest3 |  |
 | taint.cpp:639:7:639:11 | ref arg dest3 | taint.cpp:640:8:640:12 | dest3 |  |
 | taint.cpp:640:8:640:12 | dest3 | taint.cpp:640:7:640:12 | * ... | TAINT |
 | taint.cpp:647:33:647:38 | source | taint.cpp:650:17:650:22 | source |  |
@@ -6427,19 +6498,23 @@
 | taint.cpp:653:6:653:14 | call to _strnextc | taint.cpp:654:7:654:7 | c |  |
 | taint.cpp:653:16:653:17 |  | taint.cpp:653:6:653:14 | call to _strnextc | TAINT |
 | taint.cpp:662:9:662:12 | this | taint.cpp:662:25:662:29 | this |  |
+| taint.cpp:665:33:665:38 | source | taint.cpp:665:33:665:38 | source |  |
 | taint.cpp:665:33:665:38 | source | taint.cpp:667:20:667:25 | source |  |
 | taint.cpp:666:30:666:30 | c | taint.cpp:667:10:667:10 | c |  |
 | taint.cpp:666:30:666:30 | c | taint.cpp:668:8:668:8 | c |  |
 | taint.cpp:667:10:667:10 | ref arg c | taint.cpp:668:8:668:8 | c |  |
 | taint.cpp:667:12:667:15 | call to data | taint.cpp:667:3:667:8 | call to memcpy |  |
+| taint.cpp:667:20:667:25 | ref arg source | taint.cpp:665:33:665:38 | source |  |
 | taint.cpp:667:20:667:25 | source | taint.cpp:667:3:667:8 | call to memcpy | TAINT |
 | taint.cpp:667:20:667:25 | source | taint.cpp:667:12:667:15 | ref arg call to data | TAINT |
 | taint.cpp:674:9:674:12 | this | taint.cpp:674:31:674:35 | this |  |
+| taint.cpp:677:35:677:40 | source | taint.cpp:677:35:677:40 | source |  |
 | taint.cpp:677:35:677:40 | source | taint.cpp:679:20:679:25 | source |  |
 | taint.cpp:678:27:678:27 | c | taint.cpp:679:10:679:10 | c |  |
 | taint.cpp:678:27:678:27 | c | taint.cpp:680:8:680:8 | c |  |
 | taint.cpp:679:10:679:10 | ref arg c | taint.cpp:680:8:680:8 | c |  |
 | taint.cpp:679:12:679:15 | call to data | taint.cpp:679:3:679:8 | call to memcpy |  |
+| taint.cpp:679:20:679:25 | ref arg source | taint.cpp:677:35:677:40 | source |  |
 | taint.cpp:679:20:679:25 | source | taint.cpp:679:3:679:8 | call to memcpy | TAINT |
 | taint.cpp:679:20:679:25 | source | taint.cpp:679:12:679:15 | ref arg call to data | TAINT |
 | taint.cpp:690:14:690:14 | s | taint.cpp:691:18:691:18 | s |  |
@@ -7782,6 +7857,7 @@
 | vector.cpp:413:11:413:16 | call to source | vector.cpp:413:2:413:2 | call to operator* [post update] | TAINT |
 | vector.cpp:413:11:413:16 | call to source | vector.cpp:413:2:413:18 | ... = ... |  |
 | vector.cpp:414:7:414:9 | ref arg v14 | vector.cpp:415:1:415:1 | v14 |  |
+| vector.cpp:417:33:417:45 | source_string | vector.cpp:417:33:417:45 | source_string |  |
 | vector.cpp:417:33:417:45 | source_string | vector.cpp:421:23:421:35 | source_string |  |
 | vector.cpp:417:33:417:45 | source_string | vector.cpp:428:23:428:35 | source_string |  |
 | vector.cpp:417:33:417:45 | source_string | vector.cpp:442:23:442:35 | source_string |  |

cpp/ql/test/library-tests/dataflow/taint-tests/taint.cpp

@@ -126,15 +126,15 @@ void pointer_test() {
 
 	*p2 = source();
 
-	sink(*p1); // $ ast MISSING: ir
+	sink(*p1); // $ ast,ir
 	sink(*p2); // $ ast,ir
 	sink(*p3);
 
 	p3 = &t1;
-	sink(*p3); // $ ast MISSING: ir
+	sink(*p3); // $ ast,ir
 
 	*p3 = 0;
-	sink(*p3); // $ SPURIOUS: ast
+	sink(*p3); // $ SPURIOUS: ast,ir
 }
 
 // --- return values ---