[analyzer] Pointers escape into +[NSValue valueWithPointer:]...

...even though the argument is declared "const void *", because this is
just a way to pass pointers around as objects. (Though NSData is often
a better one.)

PR18262

llvm-svn: 198710

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/lib/StaticAnalyzer/Core/CallEvent.cpp b/clang/lib/StaticAnalyzer/Core/CallEvent.cpp
index e0392bd1473..838d273cc0a 100644
--- a/clang/lib/StaticAnalyzer/Core/CallEvent.cpp
+++ b/clang/lib/StaticAnalyzer/Core/CallEvent.cpp
@@ -886,6 +886,17 @@ RuntimeDefinition ObjCMethodCall::getRuntimeDefinition() const {
   return RuntimeDefinition();
 }
 
+bool ObjCMethodCall::argumentsMayEscape() const {
+  if (isInSystemHeader() && !isInstanceMessage()) {
+    Selector Sel = getSelector();
+    if (Sel.getNumArgs() == 1 &&
+        Sel.getIdentifierInfoForSlot(0)->isStr("valueWithPointer"))
+      return true;
+  }
+
+  return CallEvent::argumentsMayEscape();
+}
+
 void ObjCMethodCall::getInitialStackFrameContents(
                                              const StackFrameContext *CalleeCtx,
                                              BindingsTy &Bindings) const {