[analyzer]Fixup r156134: Handle the case when FunctionDecl isn't avail.

llvm-svn: 156183

Author: AnnaZaks

clang/lib/StaticAnalyzer/Core/ObjCMessage.cpp

@@ -139,7 +139,7 @@ bool CallOrObjCMessage::hasNonZeroCallbackArg() const {
     FD = Ctor->getConstructor();
 
   const CallExpr * CE = CallE.get<const CallExpr *>();
-  FD = dyn_cast<FunctionDecl>(CE->getCalleeDecl());
+  FD = dyn_cast_or_null<FunctionDecl>(CE->getCalleeDecl());
 
   // If calling using a function pointer, assume the function does not
   // have a callback. TODO: We could check the types of the arguments here.

clang/test/Analysis/malloc.c

@@ -829,6 +829,12 @@ void r11160612_6(StWithCallback St) {
   dealocateMemWhenDoneByRef(&St, x);
 }
 
+int mySub(int, int);
+int myAdd(int, int);
+int fPtr(unsigned cond, int x) {
+  return (cond ? mySub : myAdd)(x, x);
+}
+
 // ----------------------------------------------------------------------------
 // Below are the known false positives.