[analyzer] ObjCDeallocChecker: Only check for nil-out when type is retainable.

This fixes a crash when setting a property of struct type in -dealloc.

llvm-svn: 262659

clang/lib/StaticAnalyzer/Checkers/CheckObjCDealloc.cpp

@@ -860,9 +860,13 @@ ObjCDeallocChecker::getValueReleasedByNillingOut(const ObjCMethodCall &M,
   if (!ReceiverVal.isValid())
     return nullptr;
 
-  // Is the first argument nil?
   if (M.getNumArgs() == 0)
     return nullptr;
+
+  if (!M.getArgExpr(0)->getType()->isObjCRetainableType())
+    return nullptr;
+
+  // Is the first argument nil?
   SVal Arg = M.getArgSVal(0);
   ProgramStateRef notNilState, nilState;
   std::tie(notNilState, nilState) =

clang/test/Analysis/DeallocMissingRelease.m

@@ -664,6 +664,25 @@ void ReleaseMe(id arg);
 @end
 #endif
 
+struct SomeStruct {
+  int f;
+};
+@interface ZeroOutStructWithSetter : NSObject
+  @property(assign) struct SomeStruct s;
+@end
+
+@implementation ZeroOutStructWithSetter
+- (void)dealloc {
+  struct SomeStruct zeroedS;
+  zeroedS.f = 0;
+
+  self.s = zeroedS;
+#if NON_ARC
+  [super dealloc];
+#endif
+}
+@end
+
 #if NON_ARC
 @interface ReleaseIvarInArray : NSObject {
   NSObject *_array[3];