retain-release.m revision 8c6096e374203b1c79d85ca03ddebbc1d486c9fe 
1// RUN: clang-cc -analyze -checker-cfref -verify %s &&
2// RUN: clang-cc -analyze -checker-cfref -analyzer-store=region -verify %s
3
4
5//===----------------------------------------------------------------------===//
6// The following code is reduced using delta-debugging from
7// Foundation.h (Mac OS X).
8//
9// It includes the basic definitions for the test cases below.
10// Not including Foundation.h directly makes this test case both svelte and
11// portable to non-Mac platforms.
12//===----------------------------------------------------------------------===//
13
14typedef unsigned int __darwin_natural_t;
15typedef unsigned int UInt32;
16typedef signed long CFIndex;
17typedef const void * CFTypeRef;
18typedef const struct __CFString * CFStringRef;
19typedef const struct __CFAllocator * CFAllocatorRef;
20extern const CFAllocatorRef kCFAllocatorDefault;
21extern CFTypeRef CFRetain(CFTypeRef cf);
22extern void CFRelease(CFTypeRef cf);
23typedef struct {
24}
25CFArrayCallBacks;
26extern const CFArrayCallBacks kCFTypeArrayCallBacks;
27typedef const struct __CFArray * CFArrayRef;
28typedef struct __CFArray * CFMutableArrayRef;
29extern CFMutableArrayRef CFArrayCreateMutable(CFAllocatorRef allocator, CFIndex capacity, const CFArrayCallBacks *callBacks);
30extern const void *CFArrayGetValueAtIndex(CFArrayRef theArray, CFIndex idx);
31extern void CFArrayAppendValue(CFMutableArrayRef theArray, const void *value);
32typedef const struct __CFDictionary * CFDictionaryRef;
33typedef UInt32 CFStringEncoding;
34enum {
35kCFStringEncodingMacRoman = 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  };
36extern CFStringRef CFStringCreateWithCString(CFAllocatorRef alloc, const char *cStr, CFStringEncoding encoding);
37typedef double CFTimeInterval;
38typedef CFTimeInterval CFAbsoluteTime;
39extern CFAbsoluteTime CFAbsoluteTimeGetCurrent(void);
40typedef const struct __CFDate * CFDateRef;
41extern CFDateRef CFDateCreate(CFAllocatorRef allocator, CFAbsoluteTime at);
42extern CFAbsoluteTime CFDateGetAbsoluteTime(CFDateRef theDate);
43typedef __darwin_natural_t natural_t;
44typedef natural_t mach_port_name_t;
45typedef mach_port_name_t mach_port_t;
46typedef int kern_return_t;
47typedef kern_return_t mach_error_t;
48typedef struct objc_selector *SEL;
49typedef signed char BOOL;
50typedef unsigned long NSUInteger;
51@class NSString, Protocol;
52extern void NSLog(NSString *format, ...) __attribute__((format(__NSString__, 1, 2)));
53typedef struct _NSZone NSZone;
54@class NSInvocation, NSMethodSignature, NSCoder, NSString, NSEnumerator;
55@protocol NSObject  - (BOOL)isEqual:(id)object;
56- (id)retain;
57- (oneway void)release;
58- (id)autorelease;
59@end  @protocol NSCopying  - (id)copyWithZone:(NSZone *)zone;
60@end  @protocol NSMutableCopying  - (id)mutableCopyWithZone:(NSZone *)zone;
61@end  @protocol NSCoding  - (void)encodeWithCoder:(NSCoder *)aCoder;
62@end    @interface NSObject <NSObject> {
63}
64+ (id)allocWithZone:(NSZone *)zone;
65+ (id)alloc;
66- (void)dealloc;
67@end      extern id NSAllocateObject(Class aClass, NSUInteger extraBytes, NSZone *zone);
68typedef struct {
69}
70NSFastEnumerationState;
71@protocol NSFastEnumeration  - (NSUInteger)countByEnumeratingWithState:(NSFastEnumerationState *)state objects:(id *)stackbuf count:(NSUInteger)len;
72@end           @class NSString, NSDictionary;
73typedef double NSTimeInterval;
74@interface NSDate : NSObject <NSCopying, NSCoding>  - (NSTimeInterval)timeIntervalSinceReferenceDate;
75@end            typedef unsigned short unichar;
76@interface NSString : NSObject <NSCopying, NSMutableCopying, NSCoding>    - (NSUInteger)length;
77- ( const char *)UTF8String;
78- (id)initWithUTF8String:(const char *)nullTerminatedCString;
79+ (id)stringWithUTF8String:(const char *)nullTerminatedCString;
80@end        @class NSDictionary;
81@interface NSDictionary : NSObject <NSCopying, NSMutableCopying, NSCoding, NSFastEnumeration>  - (NSUInteger)count;
82@end    @interface NSMutableDictionary : NSDictionary  - (void)removeObjectForKey:(id)aKey;
83- (void)setObject:(id)anObject forKey:(id)aKey;
84@end  @interface NSMutableDictionary (NSMutableDictionaryCreation)  + (id)dictionaryWithCapacity:(NSUInteger)numItems;
85@end @class NSString, NSDictionary, NSArray;
86typedef mach_port_t io_object_t;
87typedef io_object_t io_service_t;
88typedef struct __DASession * DASessionRef;
89extern DASessionRef DASessionCreate( CFAllocatorRef allocator );
90typedef struct __DADisk * DADiskRef;
91extern DADiskRef DADiskCreateFromBSDName( CFAllocatorRef allocator, DASessionRef session, const char * name );
92extern DADiskRef DADiskCreateFromIOMedia( CFAllocatorRef allocator, DASessionRef session, io_service_t media );
93extern CFDictionaryRef DADiskCopyDescription( DADiskRef disk );
94extern DADiskRef DADiskCopyWholeDisk( DADiskRef disk );
95@interface NSTask : NSObject - (id)init;
96@end  extern NSString * const NSTaskDidTerminateNotification;
97@interface NSResponder : NSObject <NSCoding> {
98struct __vaFlags {
99}
100_vaFlags;
101}
102@end    @protocol NSAnimatablePropertyContainer      - (id)animator;
103@end  extern NSString *NSAnimationTriggerOrderIn ;
104@class NSBitmapImageRep, NSCursor, NSGraphicsContext, NSImage, NSPasteboard, NSScrollView, NSTextInputContext, NSWindow, NSAttributedString;
105@interface NSView : NSResponder  <NSAnimatablePropertyContainer>  {
106struct __VFlags2 {
107}
108_vFlags2;
109}
110@end  @class NSColor, NSFont, NSNotification;
111@interface NSTextTab : NSObject <NSCopying, NSCoding> {
112}
113@end @protocol NSValidatedUserInterfaceItem - (SEL)action;
114@end   @protocol NSUserInterfaceValidations - (BOOL)validateUserInterfaceItem:(id <NSValidatedUserInterfaceItem>)anItem;
115@end @class NSArray, NSError, NSImage, NSView, NSNotificationCenter, NSURL, NSScreen, NSRunningApplication;
116@interface NSApplication : NSResponder <NSUserInterfaceValidations> {
117}
118@end   enum {
119NSTerminateCancel = 0,         NSTerminateNow = 1,         NSTerminateLater = 2 };
120typedef NSUInteger NSApplicationTerminateReply;
121@protocol NSApplicationDelegate <NSObject> @optional        - (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender;
122@end    enum {
123NSUserInterfaceLayoutDirectionLeftToRight = 0,     NSUserInterfaceLayoutDirectionRightToLeft = 1 };
124@interface NSManagedObject : NSObject {
125}
126@end enum {
127kDAReturnSuccess = 0,     kDAReturnError = (((0x3e)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x01,     kDAReturnBusy = (((0x3e)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x02,     kDAReturnBadArgument = (((0x3e)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x03,     kDAReturnExclusiveAccess = (((0x3e)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x04,     kDAReturnNoResources = (((0x3e)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x05,     kDAReturnNotFound = (((0x3e)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x06,     kDAReturnNotMounted = (((0x3e)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x07,     kDAReturnNotPermitted = (((0x3e)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x08,     kDAReturnNotPrivileged = (((0x3e)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x09,     kDAReturnNotReady = (((0x3e)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x0A,     kDAReturnNotWritable = (((0x3e)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x0B,     kDAReturnUnsupported = (((0x3e)&0x3f)<<26) | (((0x368)&0xfff)<<14) | 0x0C };
128typedef mach_error_t DAReturn;
129typedef const struct __DADissenter * DADissenterRef;
130extern DADissenterRef DADissenterCreate( CFAllocatorRef allocator, DAReturn status, CFStringRef string );
131
132//===----------------------------------------------------------------------===//
133// Test cases.
134//===----------------------------------------------------------------------===//
135
136CFAbsoluteTime f1() {
137  CFAbsoluteTime t = CFAbsoluteTimeGetCurrent();
138  CFDateRef date = CFDateCreate(0, t);
139  CFRetain(date);
140  CFRelease(date);
141  CFDateGetAbsoluteTime(date); // no-warning
142  CFRelease(date);
143  t = CFDateGetAbsoluteTime(date);   // expected-warning{{Reference-counted object is used after it is released.}}
144  return t;
145}
146
147CFAbsoluteTime f2() {
148  CFAbsoluteTime t = CFAbsoluteTimeGetCurrent();
149  CFDateRef date = CFDateCreate(0, t);  
150  [((NSDate*) date) retain];
151  CFRelease(date);
152  CFDateGetAbsoluteTime(date); // no-warning
153  [((NSDate*) date) release];
154  t = CFDateGetAbsoluteTime(date);   // expected-warning{{Reference-counted object is used after it is released.}}
155  return t;
156}
157
158
159NSDate* global_x;
160
161// Test to see if we supresss an error when we store the pointer
162// to a global.
163
164CFAbsoluteTime f3() {
165  CFAbsoluteTime t = CFAbsoluteTimeGetCurrent();
166  CFDateRef date = CFDateCreate(0, t);  
167  [((NSDate*) date) retain];
168  CFRelease(date);
169  CFDateGetAbsoluteTime(date); // no-warning
170  global_x = (NSDate*) date;  
171  [((NSDate*) date) release];
172  t = CFDateGetAbsoluteTime(date);   // no-warning
173  return t;
174}
175
176//---------------------------------------------------------------------------
177// Test case 'f4' differs for region store and basic store.  See
178// retain-release-region-store.m and retain-release-basic-store.m.
179//---------------------------------------------------------------------------
180
181// Test a leak.
182
183CFAbsoluteTime f5(int x) {  
184  CFAbsoluteTime t = CFAbsoluteTimeGetCurrent();
185  CFDateRef date = CFDateCreate(0, t); // expected-warning{{leak}}
186  
187  if (x)
188    CFRelease(date);
189  
190  return t;
191}
192
193// Test a leak involving the return.
194
195CFDateRef f6(int x) {  
196  CFDateRef date = CFDateCreate(0, CFAbsoluteTimeGetCurrent());  // expected-warning{{leak}}
197  CFRetain(date);
198  return date;
199}
200
201// Test a leak involving an overwrite.
202
203CFDateRef f7() {
204  CFDateRef date = CFDateCreate(0, CFAbsoluteTimeGetCurrent());  //expected-warning{{leak}}
205  CFRetain(date);
206  date = CFDateCreate(0, CFAbsoluteTimeGetCurrent());
207  return date;
208}
209
210// Generalization of Create rule.  MyDateCreate returns a CFXXXTypeRef, and
211// has the word create.
212CFDateRef MyDateCreate();
213
214CFDateRef f8() {
215  CFDateRef date = MyDateCreate(); // expected-warning{{leak}}
216  CFRetain(date);  
217  return date;
218}
219
220CFDateRef f9() {
221  CFDateRef date = CFDateCreate(0, CFAbsoluteTimeGetCurrent());
222  int *p = 0;
223  // When allocations fail, CFDateCreate can return null.
224  if (!date) *p = 1; // expected-warning{{null}}
225  return date;
226}
227
228// Handle DiskArbitration API:
229//
230// http://developer.apple.com/DOCUMENTATION/DARWIN/Reference/DiscArbitrationFramework/
231//
232void f10(io_service_t media, DADiskRef d, CFStringRef s) {
233  DADiskRef disk = DADiskCreateFromBSDName(kCFAllocatorDefault, 0, "hello"); // expected-warning{{leak}}
234  if (disk) NSLog(@"ok");
235  
236  disk = DADiskCreateFromIOMedia(kCFAllocatorDefault, 0, media); // expected-warning{{leak}}
237  if (disk) NSLog(@"ok");
238
239  CFDictionaryRef dict = DADiskCopyDescription(d);  // expected-warning{{leak}}
240  if (dict) NSLog(@"ok"); 
241  
242  disk = DADiskCopyWholeDisk(d); // expected-warning{{leak}}
243  if (disk) NSLog(@"ok");
244    
245  DADissenterRef dissenter = DADissenterCreate(kCFAllocatorDefault,   // expected-warning{{leak}}
246                                                kDAReturnSuccess, s);
247  if (dissenter) NSLog(@"ok");
248  
249  DASessionRef session = DASessionCreate(kCFAllocatorDefault);  // expected-warning{{leak}}
250  if (session) NSLog(@"ok");
251}
252
253// Test retain/release checker with CFString and CFMutableArray.
254void f11() {
255  // Create the array.
256  CFMutableArrayRef A = CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks);
257
258  // Create a string.
259  CFStringRef s1 = CFStringCreateWithCString(0, "hello world",
260                                             kCFStringEncodingUTF8);
261
262  // Add the string to the array.
263  CFArrayAppendValue(A, s1);
264  
265  // Decrement the reference count.
266  CFRelease(s1); // no-warning
267  
268  // Get the string.  We don't own it.
269  s1 = (CFStringRef) CFArrayGetValueAtIndex(A, 0);
270  
271  // Release the array.
272  CFRelease(A); // no-warning
273  
274  // Release the string.  This is a bug.
275  CFRelease(s1); // expected-warning{{Incorrect decrement of the reference count}}
276}
277
278// PR 3337: Handle functions declared using typedefs.
279typedef CFTypeRef CREATEFUN();
280CREATEFUN MyCreateFun;
281
282void f12() {
283  CFTypeRef o = MyCreateFun(); // expected-warning {{leak}}
284}
285
286void f13_autorelease() {
287  CFMutableArrayRef A = CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks); // no-warning
288  [(id) A autorelease]; // no-warning
289}
290
291void f13_autorelease_b() {
292  CFMutableArrayRef A = CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks);
293  [(id) A autorelease];
294  [(id) A autorelease]; // expected-warning{{Object will be sent more -release messages from its containing autorelease pools than it has retain counts}}
295}
296
297CFMutableArrayRef f13_autorelease_c() {
298  CFMutableArrayRef A = CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks);
299  [(id) A autorelease];
300  [(id) A autorelease]; 
301  return A; // expected-warning{{Object will be sent more -release messages from its containing autorelease pools than it has retain counts}}
302}
303
304CFMutableArrayRef f13_autorelease_d() {
305  CFMutableArrayRef A = CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks);
306  [(id) A autorelease];
307  [(id) A autorelease]; 
308  CFMutableArrayRef B = CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks); // expected-warning{{Object will be sent more -release messages}}
309  CFRelease(B); // no-warning
310}
311
312
313// This case exercises the logic where the leak site is the same as the allocation site.
314void f14_leakimmediately() {
315  CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks); // expected-warning{{leak}}
316}
317
318// Test that we track an allocated object beyond the point where the *name*
319// of the variable storing the reference is no longer live.
320void f15() {
321  // Create the array.
322  CFMutableArrayRef A = CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks);
323  CFMutableArrayRef *B = &A;
324  // At this point, the name 'A' is no longer live.
325  CFRelease(*B);  // no-warning
326}
327
328
329// Test basic tracking of ivars associated with 'self'.  For the retain/release
330// checker we currently do not want to flag leaks associated with stores
331// of tracked objects to ivars.
332@interface SelfIvarTest : NSObject {
333  id myObj;
334}
335- (void)test_self_tracking;
336@end
337
338@implementation SelfIvarTest
339- (void)test_self_tracking {
340  myObj = (id) CFArrayCreateMutable(0, 10, &kCFTypeArrayCallBacks); // no-warning
341}
342@end
343
344// <rdar://problem/6659160>
345int isFoo(char c);
346
347static void rdar_6659160(char *inkind, char *inname)
348{
349  // We currently expect that [NSObject alloc] cannot fail.  This
350  // will be a toggled flag in the future.  It can indeed return null, but
351  // Cocoa programmers generally aren't expected to reason about out-of-memory
352  // conditions.
353  NSString *kind = [[NSString alloc] initWithUTF8String:inkind];  // expected-warning{{leak}}
354  
355  // We do allow stringWithUTF8String to fail.  This isn't really correct, as
356  // far as returning 0.  In most error conditions it will throw an exception.
357  // If allocation fails it could return 0, but again this
358  // isn't expected.
359  NSString *name = [NSString stringWithUTF8String:inname];
360  if(!name)
361    return;
362
363  const char *kindC = 0;
364  const char *nameC = 0;
365  
366  // In both cases, we cannot reach a point down below where we
367  // dereference kindC or nameC with either being null.  This is because
368  // we assume that [NSObject alloc] doesn't fail and that we have the guard
369  // up above.
370  
371  if(kind)
372    kindC = [kind UTF8String];
373  if(name)
374    nameC = [name UTF8String];
375  if(!isFoo(kindC[0])) // expected-warning{{null}}
376    return;
377  if(!isFoo(nameC[0])) // no-warning
378    return;
379
380  [kind release];
381  [name release]; // expected-warning{{Incorrect decrement of the reference count}}
382}
383
384// PR 3677 - 'allocWithZone' should be treated as following the Cocoa naming
385//  conventions with respect to 'return'ing ownership.
386@interface PR3677: NSObject @end
387@implementation PR3677
388+ (id)allocWithZone:(NSZone *)inZone {
389  return [super allocWithZone:inZone];  // no-warning
390}
391@end
392
393// PR 3820 - Reason about calls to -dealloc
394void pr3820_DeallocInsteadOfRelease(void)
395{
396  id foo = [[NSString alloc] init]; // no-warning
397  [foo dealloc];
398  // foo is not leaked, since it has been deallocated.
399}
400
401void pr3820_ReleaseAfterDealloc(void)
402{
403  id foo = [[NSString alloc] init];
404  [foo dealloc];
405  [foo release];  // expected-warning{{used after it is release}}
406  // NSInternalInconsistencyException: message sent to deallocated object
407}
408
409void pr3820_DeallocAfterRelease(void)
410{
411  NSLog(@"\n\n[%s]", __FUNCTION__);
412  id foo = [[NSString alloc] init];
413  [foo release];
414  [foo dealloc]; // expected-warning{{used after it is released}}
415  // message sent to released object
416}
417
418// From <rdar://problem/6704930>.  The problem here is that 'length' binds to
419// '($0 - 1)' after '--length', but SimpleConstraintManager doesn't know how to
420// reason about '($0 - 1) > constant'.  As a temporary hack, we drop the value
421// of '($0 - 1)' and conjure a new symbol.
422void rdar6704930(unsigned char *s, unsigned int length) {
423  NSString* name = 0;
424  if (s != 0) {
425    if (length > 0) {
426      while (length > 0) {
427        if (*s == ':') {
428          ++s;
429          --length;
430          name = [[NSString alloc] init]; // no-warning
431          break;
432        }
433        ++s;
434        --length;
435      }
436      if ((length == 0) && (name != 0)) {
437        [name release];
438        name = 0;
439      }
440      if (length == 0) { // no ':' found -> use it all as name
441        name = [[NSString alloc] init]; // no-warning
442      }
443    }
444  }
445
446  if (name != 0) {
447    [name release];
448  }
449}
450
451//===----------------------------------------------------------------------===//
452// <rdar://problem/6833332>
453// One build of the analyzer accidentally stopped tracking the allocated
454// object after the 'retain'.
455//===----------------------------------------------------------------------===//                             
456
457@interface rdar_6833332 : NSObject <NSApplicationDelegate> {
458    NSWindow *window;
459}
460@property (nonatomic, retain) NSWindow *window;
461@end
462
463@implementation rdar_6833332
464@synthesize window;
465- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
466 NSMutableDictionary *dict = [[NSMutableDictionary dictionaryWithCapacity:4] retain]; // expected-warning{{leak}}
467
468 [dict setObject:@"foo" forKey:@"bar"];
469
470 NSLog(@"%@", dict);
471}
472- (void)dealloc {
473    [window release];
474    [super dealloc];
475}
476@end
477
478//===----------------------------------------------------------------------===//
479// Tests of ownership attributes.
480//===----------------------------------------------------------------------===//
481
482@interface TestOwnershipAttr : NSObject
483- (NSString*) returnsAnOwnedString  __attribute__((ns_returns_retained));
484- (NSString*) returnsAnOwnedCFString  __attribute__((cf_returns_retained));
485@end
486
487void test_attr_1(TestOwnershipAttr *X) {
488  NSString *str = [X returnsAnOwnedString]; // expected-warning{{leak}}
489}
490
491void test_attr_1b(TestOwnershipAttr *X) {
492  NSString *str = [X returnsAnOwnedCFString]; // expected-warning{{leak}}
493}
494
495