Enhance attribute cf_returns_retained to also work (in the analyzer)

for non-Objctive-C pointer types.  This implicitly documents that the
return type is a CF object reference.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72968 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/CFRefCount.cpp

@@ -1168,12 +1168,19 @@ RetainSummaryManager::updateSummaryFromAnnotations(RetainSummary &Summ,
   if (!FD)
     return;
 
+	QualType RetTy = FD->getResultType();
+	
   // Determine if there is a special return effect for this method.
-  if (isTrackedObjCObjectType(FD->getResultType())) {
+  if (isTrackedObjCObjectType(RetTy)) {
     if (FD->getAttr<NSReturnsRetainedAttr>()) {
       Summ.setRetEffect(ObjCAllocRetE);
     }
-    else if (FD->getAttr<CFReturnsRetainedAttr>()) {
+		else if (FD->getAttr<CFReturnsRetainedAttr>()) {
+      Summ.setRetEffect(RetEffect::MakeOwned(RetEffect::CF, true));
+		}
+	}
+	else if (RetTy->getAsPointerType()) {
+		if (FD->getAttr<CFReturnsRetainedAttr>()) {
       Summ.setRetEffect(RetEffect::MakeOwned(RetEffect::CF, true));
     }
   }

test/Analysis/retain-release-gc-only.m

@@ -189,3 +189,27 @@ void test_attr_1b(TestOwnershipAttr *X) {
   NSString *str = [X returnsAnOwnedCFString]; // expected-warning{{leak}}
 }
 
+@interface MyClassTestCFAttr : NSObject {}
+- (NSDate*) returnsCFRetained __attribute__((cf_returns_retained));
+- (NSDate*) alsoReturnsRetained;
+- (NSDate*) returnsNSRetained __attribute__((ns_returns_retained));
+@end
+
+__attribute__((cf_returns_retained))
+CFDateRef returnsRetainedCFDate()  {
+  return CFDateCreate(0, CFAbsoluteTimeGetCurrent());
+}
+
+@implementation MyClassTestCFAttr
+- (NSDate*) returnsCFRetained {
+  return (NSDate*) returnsRetainedCFDate(); // No leak.
+}
+
+- (NSDate*) alsoReturnsRetained {
+  return (NSDate*) returnsRetainedCFDate(); // expected-warning{{leak}}
+}
+
+- (NSDate*) returnsNSRetained {
+  return (NSDate*) returnsRetainedCFDate(); // expected-warning{{leak}}
+}
+@end

test/Analysis/retain-release.m

@@ -704,5 +704,31 @@ void test_attr_1(TestOwnershipAttr *X) {
 void test_attr_1b(TestOwnershipAttr *X) {
   NSString *str = [X returnsAnOwnedCFString]; // expected-warning{{leak}}
 }
-//<<SLICER
+
+@interface MyClassTestCFAttr : NSObject {}
+- (NSDate*) returnsCFRetained __attribute__((cf_returns_retained));
+- (NSDate*) alsoReturnsRetained;
+- (NSDate*) returnsNSRetained __attribute__((ns_returns_retained));
+@end
+
+__attribute__((cf_returns_retained))
+CFDateRef returnsRetainedCFDate()  {
+  return CFDateCreate(0, CFAbsoluteTimeGetCurrent());
+}
+
+@implementation MyClassTestCFAttr
+- (NSDate*) returnsCFRetained {
+  return (NSDate*) returnsRetainedCFDate(); // No leak.
+}
+
+- (NSDate*) alsoReturnsRetained {
+  return (NSDate*) returnsRetainedCFDate(); // expected-warning{{leak}}
+}
+
+- (NSDate*) returnsNSRetained {
+  return (NSDate*) returnsRetainedCFDate(); // no-warning
+}
+@end
+
+