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MemCheck helps to find memory leaks in your iOS applications. It can register alloc, retain and release call for NS-objects and show detail information in console.

Connect library

Add 6 files to your project:

  • NSMemCheckObject.h
  • NSMemCheckObject.m
  • NSMutableArray+MemCheck.h
  • NSMutableArray+MemCheck.m
  • NSObject+MemCheck.h
  • NSObject+MemCheck.m

add in tail of your pch file #define MEMTEST_ON

add in the top of the application: didFinishLaunchingWithOptions: function

#ifdef MEMTEST_ON
[NSObject turnMemCheckOn];
#endif

Using

When you app is running in any moment you can press pause button and print in the Xcode's console:

po [memData allMem]

return output like that 14 items ( "2011-02-23 06:47:04 +0000 memCheckObject 0x4b45840 object 0x4b45530 stack 0x4b45a00 NSCountedSet", .. }

14 is all registered objects, which exist in memory at this moment. The list starts with last allocated object.

address after memCheckObject point to wrapper object

address after object point to allocated object

address after stack point to alloc callstack

NSCountedSet is allocated object's class

po [memData top:N]

return only N last allocated objects

**po address_of_object **

display defaul object's description

**po address_of_callstack **

display stack like that

<_NSCallStackArray 0x4b43750>(
0   CoreFoundation                      0x00da9be9 __exceptionPreprocess + 185,
1   libobjc.A.dylib                     0x00efe5c2 objc_exception_throw + 47,
2   inFoundation                        0x00002796 +[NSObject(memCheck) myAllocFunc] + 918,
3   inFoundation                        0x00001c81 -[inFoundationAppDelegate application:didFinishLaunchingWithOptions:] + 161,
4   UIKit                               0x002b31fa -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1163,
...
)

po [address_of_wrapper_object history]

display callstacks for alloc, retain and release functions, ordered by date. It shows like that:

ALLOC:
2011-02-23 06:26:56 +0000
(
0   CoreFoundation                      0x00dacbe9 __exceptionPreprocess + 185
1   libobjc.A.dylib                     0x00f015c2 objc_exception_throw + 47
2   memCheck                            0x0000310f +[NSObject(memCheck) myAllocFunc] + 831
3   memCheck                            0x000024d2 -[inFoundationAppDelegate application:didFinishLaunchingWithOptions:] + 98
4   UIKit                               0x002b61fa -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1163
...
)
RETAIN:
2011-02-23 06:26:56 +0000
(
0   CoreFoundation                      0x00dacbe9 __exceptionPreprocess + 185
1   libobjc.A.dylib                     0x00f015c2 objc_exception_throw + 47
2   memCheck                            0x000034cf -[NSObject(memCheck) myRetainFunc] + 335
3   CoreFoundation                      0x00cbf0bc CFRetain + 92
4   CoreFoundation                      0x00da5db5 +[__NSArrayI __new::] + 117
5   CoreFoundation                      0x00d188a3 +[NSArray arrayWithObject:] + 67
6   memCheck                            0x00002508 -[inFoundationAppDelegate application:didFinishLaunchingWithOptions:] + 152
7   UIKit                               0x002b61fa -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1163
...
)
RETAIN:
2011-02-23 06:26:56 +0000
(
0   CoreFoundation                      0x00dacbe9 __exceptionPreprocess + 185
1   libobjc.A.dylib                     0x00f015c2 objc_exception_throw + 47
2   memCheck                            0x000034cf -[NSObject(memCheck) myRetainFunc] + 335
3   memCheck                            0x00002538 -[inFoundationAppDelegate application:didFinishLaunchingWithOptions:] + 200
4   UIKit                               0x002b61fa -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1163
...
)
RELEASE:
2011-02-23 06:26:56 +0000
(
0   CoreFoundation                      0x00dacbe9 __exceptionPreprocess + 185
1   libobjc.A.dylib                     0x00f015c2 objc_exception_throw + 47
2   memCheck                            0x000037ee -[NSObject(memCheck) myReleaseFunc] + 302
3   memCheck                            0x0000258d -[inFoundationAppDelegate application:didFinishLaunchingWithOptions:] + 285
4   UIKit                               0x002b61fa -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1163
...
)
RETAIN:
2011-02-23 06:26:56 +0000
(
0   CoreFoundation                      0x00dacbe9 __exceptionPreprocess + 185
1   libobjc.A.dylib                     0x00f015c2 objc_exception_throw + 47
2   memCheck                            0x000034cf -[NSObject(memCheck) myRetainFunc] + 335
3   CoreFoundation                      0x00cbf0bc CFRetain + 92
4   CoreFoundation                      0x00da5db5 +[__NSArrayI __new::] + 117
5   CoreFoundation                      0x00d188a3 +[NSArray arrayWithObject:] + 67
6   memCheck                            0x000025ae -[inFoundationAppDelegate application:didFinishLaunchingWithOptions:] + 318
7   UIKit                               0x002b61fa -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1163
...
)

po [address_of_wrapper_object retains] and po [address_of_wrapper_object releases]

return callstacks for all retain or release calls, started with last.

po [memData markHeap]

save current date which divide allocated object list on earlier and later parts

po [memData showHeaps]

show allocated group divided by saved dates

po [memData objectsForHeap:n]

return allocated object list in selected group