Merge pull request #7588 from owen-mc/add-specific-needs-reference-predicates

Dataflow: Add language-specific NeedsReference predicates

java/ql/lib/semmle/code/java/dataflow/internal/FlowSummaryImpl.qll

@@ -921,13 +921,15 @@ module Private {
 
     private predicate inputNeedsReference(string c) {
       c = "Argument" or
-      parseArg(c, _)
+      parseArg(c, _) or
+      inputNeedsReferenceSpecific(c)
     }
 
     private predicate outputNeedsReference(string c) {
       c = "Argument" or
       parseArg(c, _) or
-      c = "ReturnValue"
+      c = "ReturnValue" or
+      outputNeedsReferenceSpecific(c)
     }
 
     private predicate sourceElementRef(InterpretNode ref, string output, string kind) {

java/ql/lib/semmle/code/java/dataflow/internal/FlowSummaryImplSpecific.qll

@@ -102,6 +102,12 @@ string getParameterPositionCsv(ParameterPosition pos) { result = pos.toString()
 /** Gets the textual representation of an argument position in the format used for flow summaries. */
 string getArgumentPositionCsv(ArgumentPosition pos) { result = pos.toString() }
 
+/** Holds if input specification component `c` needs a reference. */
+predicate inputNeedsReferenceSpecific(string c) { none() }
+
+/** Holds if output specification component `c` needs a reference. */
+predicate outputNeedsReferenceSpecific(string c) { none() }
+
 class SourceOrSinkElement = Top;
 
 /**