Merge pull request #13455 from owen-mc/dataflow/add-flowCheckNodeSpecific

Dataflow: add language-specific hook for breaking up big step relation

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

@@ -2021,7 +2021,8 @@ module Impl<FullStateConfigSig Config> {
       FlowCheckNode() {
         castNode(this.asNode()) or
         clearsContentCached(this.asNode(), _) or
-        expectsContentCached(this.asNode(), _)
+        expectsContentCached(this.asNode(), _) or
+        neverSkipInPathGraph(this.asNode())
       }
     }
 

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

@@ -242,6 +242,12 @@ class CastNode extends ExprNode {
   CastNode() { this.getExpr() instanceof CastingExpr }
 }
 
+/**
+ * Holds if `n` should never be skipped over in the `PathGraph` and in path
+ * explanations.
+ */
+predicate neverSkipInPathGraph(Node n) { none() }
+
 private newtype TDataFlowCallable =
   TSrcCallable(Callable c) or
   TSummarizedCallable(SummarizedCallable c) or