1// RUN: %clang_cc1 -analyze -analyzer-checker=core,osx.cocoa.RetainCount,osx.cocoa.NSAutoreleasePool -analyzer-store=region -fobjc-gc-only -fblocks -verify -Wno-objc-root-class %s
2
3//===----------------------------------------------------------------------===//
4// Header stuff.
5//===----------------------------------------------------------------------===//
6
7typedef unsigned int __darwin_natural_t;
8typedef unsigned long uintptr_t;
9typedef unsigned int uint32_t;
10typedef unsigned long long uint64_t;
11typedef unsigned int UInt32;
12typedef signed long CFIndex;
13typedef struct {
14    CFIndex location;
15    CFIndex length;
16} CFRange;
17static __inline__ __attribute__((always_inline)) CFRange CFRangeMake(CFIndex loc, CFIndex len) {
18    CFRange range;
19    range.location = loc;
20    range.length = len;
21    return range;
22}
23typedef const void * CFTypeRef;
24typedef const struct __CFString * CFStringRef;
25typedef const struct __CFAllocator * CFAllocatorRef;
26extern const CFAllocatorRef kCFAllocatorDefault;
27extern CFTypeRef CFRetain(CFTypeRef cf);
28extern void CFRelease(CFTypeRef cf);
29typedef struct {
30}
31CFArrayCallBacks;
32extern const CFArrayCallBacks kCFTypeArrayCallBacks;
33typedef const struct __CFArray * CFArrayRef;
34typedef struct __CFArray * CFMutableArrayRef;
35extern CFMutableArrayRef CFArrayCreateMutable(CFAllocatorRef allocator, CFIndex capacity, const CFArrayCallBacks *callBacks);
36extern const void *CFArrayGetValueAtIndex(CFArrayRef theArray, CFIndex idx);
37extern void CFArrayAppendValue(CFMutableArrayRef theArray, const void *value);
38typedef struct {
39}
40CFDictionaryKeyCallBacks;
41extern const CFDictionaryKeyCallBacks kCFTypeDictionaryKeyCallBacks;
42typedef struct {
43}
44CFDictionaryValueCallBacks;
45extern const CFDictionaryValueCallBacks kCFTypeDictionaryValueCallBacks;
46typedef const struct __CFDictionary * CFDictionaryRef;
47typedef struct __CFDictionary * CFMutableDictionaryRef;
48extern CFMutableDictionaryRef CFDictionaryCreateMutable(CFAllocatorRef allocator, CFIndex capacity, const CFDictionaryKeyCallBacks *keyCallBacks, const CFDictionaryValueCallBacks *valueCallBacks);
49typedef UInt32 CFStringEncoding;
50enum {
51kCFStringEncodingMacRoman = 0,     kCFStringEncodingWindowsLatin1 = 0x0500,     kCFStringEncodingISOLatin1 = 0x0201,     kCFStringEncodingNextStepLatin = 0x0B01,     kCFStringEncodingASCII = 0x0600,     kCFStringEncodingUnicode = 0x0100,     kCFStringEncodingUTF8 = 0x08000100,     kCFStringEncodingNonLossyASCII = 0x0BFF      ,     kCFStringEncodingUTF16 = 0x0100,     kCFStringEncodingUTF16BE = 0x10000100,     kCFStringEncodingUTF16LE = 0x14000100,      kCFStringEncodingUTF32 = 0x0c000100,     kCFStringEncodingUTF32BE = 0x18000100,     kCFStringEncodingUTF32LE = 0x1c000100  };
52extern CFStringRef CFStringCreateWithCString(CFAllocatorRef alloc, const char *cStr, CFStringEncoding encoding);
53typedef double CFTimeInterval;
54typedef CFTimeInterval CFAbsoluteTime;
55extern CFAbsoluteTime CFAbsoluteTimeGetCurrent(void);
56typedef const struct __CFDate * CFDateRef;
57extern CFDateRef CFDateCreate(CFAllocatorRef allocator, CFAbsoluteTime at);
58extern CFAbsoluteTime CFDateGetAbsoluteTime(CFDateRef theDate);
59typedef __darwin_natural_t natural_t;
60typedef natural_t mach_port_name_t;
61typedef mach_port_name_t mach_port_t;
62typedef int kern_return_t;
63typedef kern_return_t mach_error_t;
64enum {
65kCFNumberSInt8Type = 1,     kCFNumberSInt16Type = 2,     kCFNumberSInt32Type = 3,     kCFNumberSInt64Type = 4,     kCFNumberFloat32Type = 5,     kCFNumberFloat64Type = 6,      kCFNumberCharType = 7,     kCFNumberShortType = 8,     kCFNumberIntType = 9,     kCFNumberLongType = 10,     kCFNumberLongLongType = 11,     kCFNumberFloatType = 12,     kCFNumberDoubleType = 13,      kCFNumberCFIndexType = 14,      kCFNumberNSIntegerType = 15,     kCFNumberCGFloatType = 16,     kCFNumberMaxType = 16    };
66typedef CFIndex CFNumberType;
67typedef const struct __CFNumber * CFNumberRef;
68extern CFNumberRef CFNumberCreate(CFAllocatorRef allocator, CFNumberType theType, const void *valuePtr);
69typedef const struct __CFAttributedString *CFAttributedStringRef;
70typedef struct __CFAttributedString *CFMutableAttributedStringRef;
71extern CFAttributedStringRef CFAttributedStringCreate(CFAllocatorRef alloc, CFStringRef str, CFDictionaryRef attributes) ;
72extern CFMutableAttributedStringRef CFAttributedStringCreateMutableCopy(CFAllocatorRef alloc, CFIndex maxLength, CFAttributedStringRef aStr) ;
73extern void CFAttributedStringSetAttribute(CFMutableAttributedStringRef aStr, CFRange range, CFStringRef attrName, CFTypeRef value) ;
74typedef signed char BOOL;
75typedef unsigned long NSUInteger;
76@class NSString, Protocol;
77extern void NSLog(NSString *format, ...) __attribute__((format(__NSString__, 1, 2)));
78typedef struct _NSZone NSZone;
79@class NSInvocation, NSMethodSignature, NSCoder, NSString, NSEnumerator;
80@protocol NSObject
81- (BOOL)isEqual:(id)object;
82- (id)retain;
83- (oneway void)release;
84- (id)autorelease;
85- (Class)class;
86@end  @protocol NSCopying  - (id)copyWithZone:(NSZone *)zone;
87@end  @protocol NSMutableCopying  - (id)mutableCopyWithZone:(NSZone *)zone;
88@end  @protocol NSCoding  - (void)encodeWithCoder:(NSCoder *)aCoder;
89@end
90@interface NSObject <NSObject> {}
91+ (id)allocWithZone:(NSZone *)zone;
92+ (id)alloc;
93- (void)dealloc;
94- (oneway void)release;
95- (id)copy;
96@end
97@interface NSObject (NSCoderMethods)
98- (id)awakeAfterUsingCoder:(NSCoder *)aDecoder;
99@end
100extern id NSAllocateObject(Class aClass, NSUInteger extraBytes, NSZone *zone);
101typedef struct {
102}
103NSFastEnumerationState;
104@protocol NSFastEnumeration  - (NSUInteger)countByEnumeratingWithState:(NSFastEnumerationState *)state objects:(id *)stackbuf count:(NSUInteger)len;
105@end           @class NSString, NSDictionary;
106@interface NSValue : NSObject <NSCopying, NSCoding>  - (void)getValue:(void *)value;
107@end  @interface NSNumber : NSValue  - (char)charValue;
108- (id)initWithInt:(int)value;
109@end   @class NSString;
110@interface NSArray : NSObject <NSCopying, NSMutableCopying, NSCoding, NSFastEnumeration>
111- (NSUInteger)count;
112@end
113@interface NSArray (NSArrayCreation)
114+ (id)array;
115+ (id)arrayWithObjects:(const id [])objects count:(NSUInteger)cnt;
116@end
117       @interface NSAutoreleasePool : NSObject {
118}
119- (void)drain;
120- (id)init;
121@end extern NSString * const NSBundleDidLoadNotification;
122typedef double NSTimeInterval;
123@interface NSDate : NSObject <NSCopying, NSCoding>  - (NSTimeInterval)timeIntervalSinceReferenceDate;
124@end            typedef unsigned short unichar;
125@interface NSString : NSObject <NSCopying, NSMutableCopying, NSCoding>    - (NSUInteger)length;
126- ( const char *)UTF8String;
127- (id)initWithUTF8String:(const char *)nullTerminatedCString;
128+ (id)stringWithUTF8String:(const char *)nullTerminatedCString;
129@end        @class NSString, NSURL, NSError;
130@interface NSData : NSObject <NSCopying, NSMutableCopying, NSCoding>  - (NSUInteger)length;
131+ (id)dataWithBytesNoCopy:(void *)bytes length:(NSUInteger)length;
132+ (id)dataWithBytesNoCopy:(void *)bytes length:(NSUInteger)length freeWhenDone:(BOOL)b;
133@end   @class NSLocale, NSDate, NSCalendar, NSTimeZone, NSError, NSArray, NSMutableDictionary;
134@interface NSDictionary : NSObject <NSCopying, NSMutableCopying, NSCoding, NSFastEnumeration>  - (NSUInteger)count;
135@end    @interface NSMutableDictionary : NSDictionary  - (void)removeObjectForKey:(id)aKey;
136- (void)setObject:(id)anObject forKey:(id)aKey;
137@end  @interface NSMutableDictionary (NSMutableDictionaryCreation)  + (id)dictionaryWithCapacity:(NSUInteger)numItems;
138@end  typedef double CGFloat;
139struct CGSize {
140};
141typedef struct CGSize CGSize;
142struct CGRect {
143};
144typedef struct CGRect CGRect;
145typedef mach_port_t io_object_t;
146typedef char io_name_t[128];
147typedef io_object_t io_iterator_t;
148typedef io_object_t io_service_t;
149typedef struct IONotificationPort * IONotificationPortRef;
150typedef void (*IOServiceMatchingCallback)(  void * refcon,  io_iterator_t iterator );
151io_service_t IOServiceGetMatchingService(  mach_port_t masterPort,  CFDictionaryRef matching );
152kern_return_t IOServiceGetMatchingServices(  mach_port_t masterPort,  CFDictionaryRef matching,  io_iterator_t * existing );
153kern_return_t IOServiceAddNotification(  mach_port_t masterPort,  const io_name_t notificationType,  CFDictionaryRef matching,  mach_port_t wakePort,  uintptr_t reference,  io_iterator_t * notification ) __attribute__((deprecated));
154kern_return_t IOServiceAddMatchingNotification(  IONotificationPortRef notifyPort,  const io_name_t notificationType,  CFDictionaryRef matching,         IOServiceMatchingCallback callback,         void * refCon,  io_iterator_t * notification );
155CFMutableDictionaryRef IOServiceMatching(  const char * name );
156CFMutableDictionaryRef IOServiceNameMatching(  const char * name );
157CFMutableDictionaryRef IOBSDNameMatching(  mach_port_t masterPort,  uint32_t options,  const char * bsdName );
158CFMutableDictionaryRef IOOpenFirmwarePathMatching(  mach_port_t masterPort,  uint32_t options,  const char * path );
159CFMutableDictionaryRef IORegistryEntryIDMatching(  uint64_t entryID );
160typedef struct __DASession * DASessionRef;
161extern DASessionRef DASessionCreate( CFAllocatorRef allocator );
162typedef struct __DADisk * DADiskRef;
163extern DADiskRef DADiskCreateFromBSDName( CFAllocatorRef allocator, DASessionRef session, const char * name );
164extern DADiskRef DADiskCreateFromIOMedia( CFAllocatorRef allocator, DASessionRef session, io_service_t media );
165extern CFDictionaryRef DADiskCopyDescription( DADiskRef disk );
166extern DADiskRef DADiskCopyWholeDisk( DADiskRef disk );
167@interface NSTask : NSObject - (id)init;
168@end                    typedef struct CGColorSpace *CGColorSpaceRef;
169typedef struct CGImage *CGImageRef;
170typedef struct CGLayer *CGLayerRef;
171@interface NSResponder : NSObject <NSCoding> {
172}
173@end    @protocol NSAnimatablePropertyContainer      - (id)animator;
174@end  extern NSString *NSAnimationTriggerOrderIn ;
175@interface NSView : NSResponder  <NSAnimatablePropertyContainer>  {
176}
177@end @protocol NSValidatedUserInterfaceItem - (SEL)action;
178@end   @protocol NSUserInterfaceValidations - (BOOL)validateUserInterfaceItem:(id <NSValidatedUserInterfaceItem>)anItem;
179@end  @class NSDate, NSDictionary, NSError, NSException, NSNotification;
180@interface NSApplication : NSResponder <NSUserInterfaceValidations> {
181}
182@end   enum {
183NSTerminateCancel = 0,         NSTerminateNow = 1,         NSTerminateLater = 2 };
184typedef NSUInteger NSApplicationTerminateReply;
185@protocol NSApplicationDelegate <NSObject> @optional        - (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender;
186@end  @class NSAttributedString, NSEvent, NSFont, NSFormatter, NSImage, NSMenu, NSText, NSView, NSTextView;
187@interface NSCell : NSObject <NSCopying, NSCoding> {
188}
189@end @class NSTextField, NSPanel, NSArray, NSWindow, NSImage, NSButton, NSError;
190typedef struct {
191}
192CVTimeStamp;
193@interface CIImage : NSObject <NSCoding, NSCopying> {
194}
195typedef int CIFormat;
196@end  enum {
197kDAReturnSuccess = 0,     kDAReturnError = (((0x3eU)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x01,     kDAReturnBusy = (((0x3eU)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x02,     kDAReturnBadArgument = (((0x3eU)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x03,     kDAReturnExclusiveAccess = (((0x3eU)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x04,     kDAReturnNoResources = (((0x3eU)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x05,     kDAReturnNotFound = (((0x3eU)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x06,     kDAReturnNotMounted = (((0x3eU)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x07,     kDAReturnNotPermitted = (((0x3eU)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x08,     kDAReturnNotPrivileged = (((0x3eU)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x09,     kDAReturnNotReady = (((0x3eU)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x0A,     kDAReturnNotWritable = (((0x3eU)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x0B,     kDAReturnUnsupported = (((0x3eU)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x0C };
198typedef mach_error_t DAReturn;
199typedef const struct __DADissenter * DADissenterRef;
200extern DADissenterRef DADissenterCreate( CFAllocatorRef allocator, DAReturn status, CFStringRef string );
201@interface CIContext: NSObject {
202}
203- (CGImageRef)createCGImage:(CIImage *)im fromRect:(CGRect)r;
204- (CGImageRef)createCGImage:(CIImage *)im fromRect:(CGRect)r     format:(CIFormat)f colorSpace:(CGColorSpaceRef)cs;
205- (CGLayerRef)createCGLayerWithSize:(CGSize)size info:(CFDictionaryRef)d;
206@end extern NSString* const QCRendererEventKey;
207@protocol QCCompositionRenderer - (NSDictionary*) attributes;
208@end   @interface QCRenderer : NSObject <QCCompositionRenderer> {
209}
210- (id) createSnapshotImageOfType:(NSString*)type;
211@end  extern NSString* const QCViewDidStartRenderingNotification;
212@interface QCView : NSView <QCCompositionRenderer> {
213}
214- (id) createSnapshotImageOfType:(NSString*)type;
215@end    enum {
216ICEXIFOrientation1 = 1,     ICEXIFOrientation2 = 2,     ICEXIFOrientation3 = 3,     ICEXIFOrientation4 = 4,     ICEXIFOrientation5 = 5,     ICEXIFOrientation6 = 6,     ICEXIFOrientation7 = 7,     ICEXIFOrientation8 = 8, };
217@class ICDevice;
218@protocol ICDeviceDelegate <NSObject>  @required      - (void)didRemoveDevice:(ICDevice*)device;
219@end extern NSString *const ICScannerStatusWarmingUp;
220@class ICScannerDevice;
221@protocol ICScannerDeviceDelegate <ICDeviceDelegate>  @optional       - (void)scannerDeviceDidBecomeAvailable:(ICScannerDevice*)scanner;
222@end
223CFTypeRef CFMakeCollectable(CFTypeRef cf) ;
224
225static __inline__ __attribute__((always_inline)) id NSMakeCollectable(CFTypeRef
226cf) {
227    return cf ? (id)CFMakeCollectable(cf) : ((void*)0);
228}
229
230//===----------------------------------------------------------------------===//
231// Test cases.
232//===----------------------------------------------------------------------===//
233
234void f1() {
235  CFMutableArrayRef A = CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks); // no-warning
236  id x = [(id) A autorelease];
237  CFRelease((CFMutableArrayRef) x);
238}
239
240void f2() {
241  CFMutableArrayRef A = CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks); // expected-warning{{leak}}
242  id x = [(id) A retain];
243  [x release];
244  [x release];
245}
246
247void f3() {
248  CFMutableArrayRef A = CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks); // expected-warning{{leak}}
249  CFMakeCollectable(A);
250  CFRetain(A);
251}
252
253void f3b() {
254  CFMutableArrayRef A = CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks); // no-warning
255  CFMakeCollectable(A);
256}
257
258
259void f4() {
260  CFMutableArrayRef A = CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks); // expected-warning{{leak}}
261  NSMakeCollectable(A);
262  CFRetain(A);
263}
264
265void f4b() {
266  CFMutableArrayRef A = CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks); // no-warning
267  NSMakeCollectable(A);
268}
269
270void f5() {
271  id x = [NSMakeCollectable(CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks)) autorelease]; // no-warning
272}
273
274void f5b() {
275  id x = [(id) CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks) autorelease]; // expected-warning{{leak}}
276}
277
278// Test return of non-owned objects in contexts where an owned object
279// is expected.
280@interface TestReturnNotOwnedWhenExpectedOwned
281- (NSString*)newString;
282- (CFMutableArrayRef)newArray;
283@end
284
285@implementation TestReturnNotOwnedWhenExpectedOwned
286- (NSString*)newString {
287  NSString *s = [NSString stringWithUTF8String:"hello"]; // expected-warning{{Potential leak (when using garbage collection) of an object}}
288  CFRetain(s);
289  return s;
290}
291- (CFMutableArrayRef)newArray{
292   return CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks); // no-warning
293}
294@end
295
296//===----------------------------------------------------------------------===//
297// <rdar://problem/6948053> False positive: object substitution during -init*
298//   methods warns about returning +0 when using -fobjc-gc-only
299//===----------------------------------------------------------------------===//
300
301@interface MyClassRdar6948053 : NSObject
302- (id) init;
303+ (id) shared;
304@end
305
306@implementation MyClassRdar6948053
307+(id) shared {
308  return (id) 0;
309}
310- (id) init
311{
312  Class myClass = [self class];
313  [self release];
314  return [[myClass shared] retain]; // no-warning
315}
316@end
317
318//===----------------------------------------------------------------------===//
319// <rdar://problem/7174400> 'ciContext createCGImage:outputImage fromRect:' returns a retained CF object (not GC'ed)//===----------------------------------------------------------------------===//
320//===----------------------------------------------------------------------===//
321
322void rdar_7174400(QCView *view, QCRenderer *renderer, CIContext *context,
323                  NSString *str, CIImage *img, CGRect rect,
324                  CIFormat form, CGColorSpaceRef cs) {
325  [view createSnapshotImageOfType:str]; // no-warning
326  [renderer createSnapshotImageOfType:str]; // no-warning
327  [context createCGImage:img fromRect:rect]; // expected-warning{{leak}}
328  [context createCGImage:img fromRect:rect format:form colorSpace:cs]; // expected-warning{{leak}}
329}
330
331//===----------------------------------------------------------------------===//
332// <rdar://problem/6250216> Warn against using -[NSAutoreleasePool release] in
333//  GC mode
334//===----------------------------------------------------------------------===//
335
336void rdar_6250216(void) {
337    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
338    [pool release]; // expected-warning{{Use -drain instead of -release when using NSAutoreleasePool and garbage collection}}
339}
340
341
342//===----------------------------------------------------------------------===//
343// <rdar://problem/7407273> Don't crash when analyzing messages sent to blocks
344//===----------------------------------------------------------------------===//
345
346@class RDar7407273;
347typedef void (^RDar7407273Block)(RDar7407273 *operation);
348void rdar7407273(RDar7407273Block b) {
349  [b copy];
350}
351
352//===----------------------------------------------------------------------===//
353// Tests of ownership attributes.
354//===----------------------------------------------------------------------===//
355
356@interface TestOwnershipAttr : NSObject
357- (NSString*) returnsAnOwnedString __attribute__((ns_returns_retained));
358- (NSString*) returnsAnOwnedCFString  __attribute__((cf_returns_retained));
359@end
360
361void test_attr_1(TestOwnershipAttr *X) {
362  NSString *str = [X returnsAnOwnedString]; // no-warning
363}
364
365void test_attr_1b(TestOwnershipAttr *X) {
366  NSString *str = [X returnsAnOwnedCFString]; // expected-warning{{leak}}
367}
368
369@interface MyClassTestCFAttr : NSObject {}
370- (NSDate*) returnsCFRetained __attribute__((cf_returns_retained));
371- (NSDate*) alsoReturnsRetained;
372- (NSDate*) returnsNSRetained __attribute__((ns_returns_retained));
373@end
374
375__attribute__((cf_returns_retained))
376CFDateRef returnsRetainedCFDate()  {
377  return CFDateCreate(0, CFAbsoluteTimeGetCurrent());
378}
379
380@implementation MyClassTestCFAttr
381- (NSDate*) returnsCFRetained {
382  return (NSDate*) returnsRetainedCFDate(); // No leak.
383}
384
385- (NSDate*) alsoReturnsRetained {
386  return (NSDate*) returnsRetainedCFDate(); // expected-warning{{leak}}
387}
388
389- (NSDate*) returnsNSRetained {
390  return (NSDate*) returnsRetainedCFDate(); // expected-warning{{leak}}
391}
392@end
393
394
395#if __has_feature(attribute_ns_consumed)
396#define NS_CONSUMED __attribute__((ns_consumed))
397#endif
398#if __has_feature(attribute_cf_consumed)
399#define CF_CONSUMED __attribute__((cf_consumed))
400#endif
401
402void consumeAndStopTracking(id NS_CONSUMED obj, void (^callback)(void));
403void CFConsumeAndStopTracking(CFTypeRef CF_CONSUMED obj, void (^callback)(void));
404
405void testConsumeAndStopTracking() {
406  id retained = [@[] retain]; // +0, GC
407  consumeAndStopTracking(retained, ^{}); // no-warning
408
409  id doubleRetained = [[@[] retain] retain]; // +0, GC
410  consumeAndStopTracking(doubleRetained, ^{
411    [doubleRetained release];
412  }); // no-warning
413
414  id unretained = @[]; // +0
415  consumeAndStopTracking(unretained, ^{}); // no-warning, GC
416}
417
418void testCFConsumeAndStopTrackingMsg() {
419  id retained = [@[] retain]; // +0, GC
420  CFConsumeAndStopTracking((CFTypeRef)retained, ^{}); // expected-warning {{Incorrect decrement of the reference count of an object that is not owned at this point by the caller}}
421}
422
423void testCFConsumeAndStopTracking() {
424  CFTypeRef retained = returnsRetainedCFDate(); // +1
425  CFConsumeAndStopTracking(retained, ^{}); // no-warning
426
427  CFTypeRef doubleRetained = CFRetain(returnsRetainedCFDate()); // +2
428  CFConsumeAndStopTracking(doubleRetained, ^{
429    CFRelease(doubleRetained);
430  }); // no-warning
431
432  id unretained = @[]; // +0
433  CFConsumeAndStopTracking((CFTypeRef)unretained, ^{}); // expected-warning {{Incorrect decrement of the reference count of an object that is not owned at this point by the caller}}
434}
435