Reapply r99024 (but with the memory issue now fixed).
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@99064 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Checker/BugReporterVisitors.cpp b/lib/Checker/BugReporterVisitors.cpp
index 7104f91..1d6994b 100644
--- a/lib/Checker/BugReporterVisitors.cpp
+++ b/lib/Checker/BugReporterVisitors.cpp
@@ -379,3 +379,52 @@
BRC.addVisitor(new FindLastStoreBRVisitor(V, R));
}
+
+
+namespace {
+class NilReceiverVisitor : public BugReporterVisitor {
+public:
+ NilReceiverVisitor() {}
+
+ void Profile(llvm::FoldingSetNodeID &ID) const {
+ static int x = 0;
+ ID.AddPointer(&x);
+ }
+
+ PathDiagnosticPiece* VisitNode(const ExplodedNode *N,
+ const ExplodedNode *PrevN,
+ BugReporterContext& BRC) {
+
+ const PostStmt *P = N->getLocationAs<PostStmt>();
+ if (!P)
+ return 0;
+ const ObjCMessageExpr *ME = P->getStmtAs<ObjCMessageExpr>();
+ if (!ME)
+ return 0;
+ const Expr *Receiver = ME->getReceiver();
+ if (!Receiver)
+ return 0;
+ const GRState *state = N->getState();
+ const SVal &V = state->getSVal(Receiver);
+ const DefinedOrUnknownSVal *DV = dyn_cast<DefinedOrUnknownSVal>(&V);
+ if (!DV)
+ return 0;
+ state = state->Assume(*DV, true);
+ if (state)
+ return 0;
+
+ // The receiver was nil, and hence the method was skipped.
+ // Register a BugReporterVisitor to issue a message telling us how
+ // the receiver was null.
+ bugreporter::registerTrackNullOrUndefValue(BRC, Receiver, N);
+ // Issue a message saying that the method was skipped.
+ PathDiagnosticLocation L(Receiver, BRC.getSourceManager());
+ return new PathDiagnosticEventPiece(L, "No method actually called "
+ "because the receiver is nil");
+ }
+};
+} // end anonymous namespace
+
+void clang::bugreporter::registerNilReceiverVisitor(BugReporterContext &BRC) {
+ BRC.addVisitor(new NilReceiverVisitor());
+}