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C#: Replace Guards with the new implementation.

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This commit is contained in:
Anders Schack-Mulligen
2025-10-21 12:25:49 +02:00
parent 8b3e62652c
commit 7241bedf05
9 changed files with 888 additions and 1442 deletions
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3
csharp/ql/lib/semmle/code/csharp/Caching.qll
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@@ -10,7 +10,6 @@ module Stages {
cached
module ControlFlowStage {
private import semmle.code.csharp.controlflow.internal.Splitting
private import semmle.code.csharp.controlflow.Guards as Guards
cached
predicate forceCachingInSameStage() { any() }
@@ -21,8 +20,6 @@ module Stages {
or
exists(ControlFlow::Node n)
or
Guards::Internal::isCustomNullCheck(_, _, _, _)
or
forceCachingInSameStageRev()
}
}

1088
csharp/ql/lib/semmle/code/csharp/controlflow/Guards.qll
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File diff suppressed because it is too large Load Diff

3
csharp/ql/lib/semmle/code/csharp/dataflow/internal/DataFlowPrivate.qll
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@@ -2906,7 +2906,8 @@ class DataFlowExpr = Expr;
/** Holds if `e` is an expression that always has the same Boolean value `val`. */
private predicate constantBooleanExpr(Expr e, boolean val) {
e = any(AbstractValues::BooleanValue bv | val = bv.getValue()).getAnExpr()
e.getType() instanceof BoolType and
e.getValue() = val.toString()
or
exists(Ssa::ExplicitDefinition def, Expr src |
e = def.getARead() and

1186
csharp/ql/test/library-tests/controlflow/guards/AbstractValue.expected
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File diff suppressed because it is too large Load Diff

8
csharp/ql/test/library-tests/controlflow/guards/AbstractValue.ql
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@@ -2,11 +2,5 @@ import csharp
private import semmle.code.csharp.controlflow.Guards
query predicate abstractValue(AbstractValue value, Expr e) {
e = value.getAnExpr() and e.fromSource()
}
query predicate dualValue(AbstractValue value, AbstractValue dual) { dual = value.getDualValue() }
query predicate singletonValue(AbstractValue value) {
value.isSingleton() and value.getAnExpr().fromSource()
Guards::InternalUtil::exprHasValue(e, value) and e.fromSource()
}

14
csharp/ql/test/query-tests/Nullness/EqualityCheck.expected
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@@ -190,12 +190,12 @@
| E.cs:83:13:83:24 | ... != ... | false | E.cs:83:21:83:24 | null | E.cs:83:13:83:16 | access to parameter vals |
| E.cs:85:18:85:29 | ... != ... | false | E.cs:85:18:85:21 | access to parameter vals | E.cs:85:26:85:29 | null |
| E.cs:85:18:85:29 | ... != ... | false | E.cs:85:26:85:29 | null | E.cs:85:18:85:21 | access to parameter vals |
| E.cs:90:17:90:27 | access to local variable switchguard | match access to constant MY_CONST_A | E.cs:90:17:90:27 | access to local variable switchguard | E.cs:92:18:92:27 | access to constant MY_CONST_A |
| E.cs:90:17:90:27 | access to local variable switchguard | match access to constant MY_CONST_A | E.cs:92:18:92:27 | access to constant MY_CONST_A | E.cs:90:17:90:27 | access to local variable switchguard |
| E.cs:90:17:90:27 | access to local variable switchguard | match access to constant MY_CONST_B | E.cs:90:17:90:27 | access to local variable switchguard | E.cs:97:18:97:27 | access to constant MY_CONST_B |
| E.cs:90:17:90:27 | access to local variable switchguard | match access to constant MY_CONST_B | E.cs:97:18:97:27 | access to constant MY_CONST_B | E.cs:90:17:90:27 | access to local variable switchguard |
| E.cs:90:17:90:27 | access to local variable switchguard | match access to constant MY_CONST_C | E.cs:90:17:90:27 | access to local variable switchguard | E.cs:95:18:95:27 | access to constant MY_CONST_C |
| E.cs:90:17:90:27 | access to local variable switchguard | match access to constant MY_CONST_C | E.cs:95:18:95:27 | access to constant MY_CONST_C | E.cs:90:17:90:27 | access to local variable switchguard |
| E.cs:92:13:92:28 | case ...: | true | E.cs:90:17:90:27 | access to local variable switchguard | E.cs:92:18:92:27 | access to constant MY_CONST_A |
| E.cs:92:13:92:28 | case ...: | true | E.cs:92:18:92:27 | access to constant MY_CONST_A | E.cs:90:17:90:27 | access to local variable switchguard |
| E.cs:95:13:95:28 | case ...: | true | E.cs:90:17:90:27 | access to local variable switchguard | E.cs:95:18:95:27 | access to constant MY_CONST_C |
| E.cs:95:13:95:28 | case ...: | true | E.cs:95:18:95:27 | access to constant MY_CONST_C | E.cs:90:17:90:27 | access to local variable switchguard |
| E.cs:97:13:97:28 | case ...: | true | E.cs:90:17:90:27 | access to local variable switchguard | E.cs:97:18:97:27 | access to constant MY_CONST_B |
| E.cs:97:13:97:28 | case ...: | true | E.cs:97:18:97:27 | access to constant MY_CONST_B | E.cs:90:17:90:27 | access to local variable switchguard |
| E.cs:126:21:126:29 | ... == ... | true | E.cs:126:21:126:24 | access to local variable step | E.cs:126:29:126:29 | 0 |
| E.cs:126:21:126:29 | ... == ... | true | E.cs:126:29:126:29 | 0 | E.cs:126:21:126:24 | access to local variable step |
| E.cs:153:13:153:24 | ... != ... | false | E.cs:153:13:153:16 | access to local variable obj2 | E.cs:153:21:153:24 | null |
@@ -252,6 +252,8 @@
| E.cs:442:13:442:18 | ... == ... | true | E.cs:442:18:442:18 | 1 | E.cs:442:13:442:13 | access to parameter i |
| E.cs:447:13:447:18 | ... == ... | true | E.cs:447:13:447:13 | access to parameter i | E.cs:447:18:447:18 | 2 |
| E.cs:447:13:447:18 | ... == ... | true | E.cs:447:18:447:18 | 2 | E.cs:447:13:447:13 | access to parameter i |
| E.cs:447:23:447:35 | ... is ... | false | E.cs:447:23:447:23 | access to parameter s | E.cs:447:32:447:35 | null |
| E.cs:447:23:447:35 | ... is ... | false | E.cs:447:32:447:35 | null | E.cs:447:23:447:23 | access to parameter s |
| E.cs:452:13:452:18 | ... == ... | true | E.cs:452:13:452:13 | access to parameter i | E.cs:452:18:452:18 | 3 |
| E.cs:452:13:452:18 | ... == ... | true | E.cs:452:18:452:18 | 3 | E.cs:452:13:452:13 | access to parameter i |
| Forwarding.cs:59:13:59:21 | ... == ... | true | Forwarding.cs:59:13:59:13 | access to parameter o | Forwarding.cs:59:18:59:21 | null |

5
csharp/ql/test/query-tests/Nullness/EqualityCheck.ql
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@@ -1,5 +1,6 @@
import csharp
import semmle.code.csharp.controlflow.Guards
from Expr e1, AbstractValue v, Expr e2
select Internal::getAnEqualityCheck(e1, v, e2), v, e1, e2
from Guard guard, Expr e1, Expr e2, boolean eqval
where guard.isEquality(e1, e2, eqval)
select guard, eqval, e1, e2

2
csharp/ql/test/query-tests/Nullness/Forwarding.cs
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@@ -28,7 +28,7 @@ class ForwardingTests
if (IsNotNull(s))
{
Console.WriteLine(s.Length); // GOOD
Console.WriteLine(s.Length); // $ SPURIOUS (false positive): Alert[cs/dereferenced-value-is-always-null]
}
if (IsNotNullWrong(s))

1
csharp/ql/test/query-tests/Nullness/NullAlways.expected
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@@ -37,6 +37,7 @@
| E.cs:405:16:405:16 | access to local variable i | Variable $@ is always null at this dereference. | E.cs:403:14:403:14 | i | i |
| E.cs:439:13:439:13 | access to parameter s | Variable $@ is always null at this dereference. | E.cs:435:29:435:29 | s | s |
| F.cs:8:9:8:9 | access to local variable o | Variable $@ is always null at this dereference. | F.cs:7:16:7:16 | o | o |
| Forwarding.cs:31:31:31:31 | access to local variable s | Variable $@ is always null at this dereference. | Forwarding.cs:7:16:7:16 | s | s |
| Forwarding.cs:36:31:36:31 | access to local variable s | Variable $@ is always null at this dereference. | Forwarding.cs:7:16:7:16 | s | s |
| Forwarding.cs:40:27:40:27 | access to local variable s | Variable $@ is always null at this dereference. | Forwarding.cs:7:16:7:16 | s | s |
| NullAlwaysBad.cs:9:30:9:30 | access to parameter s | Variable $@ is always null at this dereference. | NullAlwaysBad.cs:7:29:7:29 | s | s |