[analyzer] Perform escaping in RetainCountChecker on type mismatch even for inlined functions

[george.karpenkov]

Summary

The fix done in D55465 did not previously apply when the function was inlined.

rdar://46889541

[NoQ]

Ok!

clang/lib/StaticAnalyzer/Checkers/RetainCountChecker/RetainCountChecker.cpp

if (RE.isOwned()) {
     return RefVal::makeOwned(RE.getObjKind(), ResultTy);
   } else if (RE.notOwned()) {
     return RefVal::makeNotOwned(RE.getObjKind(), ResultTy);
   }
 
   return None;
 }
 
+static bool isPointerToObject(QualType QT) {
+  QualType PT = QT->getPointeeType();
+  if (!PT.isNull())
+    if (PT->getAsCXXRecordDecl())
+      return true;
+  return false;
+}
+
+/// Whether the tracked value should be escaped on a given call.
+/// OSObjects are escaped when passed to void * / etc.
+static bool shouldEscapeArgumentOnCall(const CallEvent &CE, unsigned ArgIdx,
+                                       const RefVal *TrackedValue) {
+  if (TrackedValue->getObjKind() != RetEffect::OS)
+    return false;
+  if (ArgIdx >= CE.parameters().size())
+    return false;
+  return !isPointerToObject(CE.parameters()[ArgIdx]->getType());
+}
+
 // We don't always get the exact modeling of the function with regards to the
 // retain count checker even when the function is inlined. For example, we need
 // to stop tracking the symbols which were marked with StopTrackingHard.
 void RetainCountChecker::processSummaryOfInlined(const RetainSummary &Summ,
                                                  const CallEvent &CallOrMsg,
                                                  CheckerContext &C) const {
   ProgramStateRef state = C.getState();
 
   // Evaluate the effect of the arguments.
   for (unsigned idx = 0, e = CallOrMsg.getNumArgs(); idx != e; ++idx) {
-    if (Summ.getArg(idx) == StopTrackingHard) {
-      SVal V = CallOrMsg.getArgSVal(idx);
-      if (SymbolRef Sym = V.getAsLocSymbol()) {
+
+      bool ShouldRemoveBinding = Summ.getArg(idx) == StopTrackingHard;
+      if (const RefVal *T = getRefBinding(state, Sym))
+        if (shouldEscapeArgumentOnCall(CallOrMsg, idx, T))
+          ShouldRemoveBinding = true;
+
+      if (ShouldRemoveBinding)
         state = removeRefBinding(state, Sym);
-      }
-    }
-  }
 
   // Evaluate the effect on the message receiver.
   if (const auto *MsgInvocation = dyn_cast<ObjCMethodCall>(&CallOrMsg)) {
     if (SymbolRef Sym = MsgInvocation->getReceiverSVal().getAsLocSymbol()) {
       if (Summ.getReceiverEffect() == StopTrackingHard) {
         state = removeRefBinding(state, Sym);
       }
     }
static ProgramStateRef updateOutParameter(ProgramStateRef State,
 
   default:
     llvm_unreachable("only for out parameters");
   }
 
   return State;
 }
 
-static bool isPointerToObject(QualType QT) {
-  QualType PT = QT->getPointeeType();
-  if (!PT.isNull())
-    if (PT->getAsCXXRecordDecl())
-      return true;
-  return false;
-}
-
-/// Whether the tracked value should be escaped on a given call.
-/// OSObjects are escaped when passed to void * / etc.
-static bool shouldEscapeArgumentOnCall(const CallEvent &CE, unsigned ArgIdx,
-                                       const RefVal *TrackedValue) {
-  if (TrackedValue->getObjKind() != RetEffect::OS)
-    return false;
-  if (ArgIdx >= CE.parameters().size())
-    return false;
-  return !isPointerToObject(CE.parameters()[ArgIdx]->getType());
-}
-
 void RetainCountChecker::checkSummary(const RetainSummary &Summ,
                                       const CallEvent &CallOrMsg,
                                       CheckerContext &C) const {
   ProgramStateRef state = C.getState();
 
   // Evaluate the effect of the arguments.
   RefVal::Kind hasErr = (RefVal::Kind) 0;
   SourceRange ErrorRange;

clang/test/Analysis/osobject-retain-release.cpp

struct OtherStruct {
   static void doNothingToArray(OSArray *array);
   OtherStruct(OSArray *arr);
 };
 
 struct OSMetaClassBase {
   static OSObject *safeMetaCast(const OSObject *inst, const OSMetaClass *meta);
 };
 
+typedef unsigned long MYTYPE;
+
 void escape(void *);
+void escape_with_source(MYTYPE p) {}
 bool coin();
 
 bool os_consume_violation_two_args(OS_CONSUME OSObject *obj, bool extra) {
   if (coin()) { // expected-note{{Assuming the condition is false}}
                 // expected-note@-1{{Taking false branch}}
     escape(obj);
     return true;
   }
void use_os_consume_ok() {
   os_consume_ok(obj);
 }
 
 void test_escaping_into_voidstar() {
   OSObject *obj = new OSObject;
   escape(obj);
 }
 
+void test_escape_has_source() {
+  OSObject *obj = new OSObject;
+  if (obj)
+    escape_with_source((MYTYPE)obj);
+  return;
+}
+
 void test_no_infinite_check_recursion(MyArray *arr) {
   OSObject *input = new OSObject;
   OSObject *o = arr->generateObject(input);
   o->release();
   input->release();
 }