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Memory leak detection for WinCE

, 12 Jun 2001 CPOL
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This code detects memory leaks in embedded VC++ almost the same way crtdbg does in VC++.

Introduction

This code detects memory leaks in embedded VC++ almost the same way crtdbg does in VC++. At the end of program execution it will display in the debug window if there were any memory leaks and how the memory looks so you can identify where your memory leak occurred. It will display in the debug window a message saying no memory leaks detected if there are no memory leaks. Similar to what crtdbg.h does in VC++. The code detects memory leaks generated with calls to new and delete operators in C++. The code doesn't detect memory leaks generated with C functions: malloc, calloc, free, but that can be done in the future. Let me know and I will program it.

There are 3 simple steps in order to enable memory leak detection:

  1. Define _DEBUG
    #define _DEBUG
  2. Include "crtdbg.h"
    #include "crtdbg.h"
  3. Let your first line in the code be:
    _CrtSetDbgFlag (ON);

Tips on debugging:

Tip 1:

Although it doesn't display the line where the memory leak occurred (read Tip 2), the utility display the address in hex, and you can add a small code to the operator new function, just after the first malloc:

	if (retPtr == (void*)0x76DA0)
		dumb instruction; <- place a breakpoint on this one

so you can detect easily which line of your code called the operator new to allocate memory at the specified address and wasn't freed.

Tip 2:

Here's a trick that allow you to get the correct line and filename where the memory leak occurred. Define the following line in every file, or define it in a header file and include it in every file where you want accurate line and filename:

#define new new(_T(__FILE__), __LINE__)

What the code actually does is override the global operator new that besides allocating memory, it retains the pointer to the allocated memory in a list. The operator delete simply releases memory and deletes the reference to that memory from the list. In the end of the program execution, all the pointers still in the list simply mean memory leaks, and they are displayed in the debug window.

The macro _CrtSetDbgFlag (ON); simply declares an instance of garbageCollector. It has to be the first line of your code, to insure it is the last variable in your program to be destroy, as in its destructor it performs checking of the pointer list and it displays memory leaks. So its destructor must be the last destructor called.

License

Public domain

Comments

Please report any bugs to Ciprian_Miclaus@yahoo.com. You can use and distribute this code freely, but please keep these few lines. If you make any improvements, or have any ideas about how this code could be improved or just you feel you need to comment this code in any way, please send your comments, idea, improvements to me to my email above.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Ciprian Miclaus

United States United States
No Biography provided

Comments and Discussions

 
GeneralEnabling memory leak detection in VC++ Pingroupelizas26-Feb-10 3:34 
QuestionHow to port wince in smdk2410 board. Pinmemberamiya das30-Mar-08 22:41 
Questionwhat about new byte[x] and delete [] Pinmemberbsyossi15-Jan-07 0:29 
GeneralC rountines Pinmembermarkpotts16-Nov-06 1:15 
GeneralRe: C rountines PinmemberCookie FJ15-Feb-08 19:06 
QuestionWhat if CMemoryDump PinmemberSreekanth Muralidharan28-Nov-05 20:18 
GeneralSolution for possible bug with delete PinmemberTommyknocker19806-Oct-05 23:48 
GeneralRe: Solution for possible bug with delete PinmemberSreekanth Muralidharan30-Nov-05 17:59 
Hello
The bug is still there in the MFC architecture as well. You should point to a NULL even after you delete the allocations.
It should be something like:

if(alloc)
{
delete alloc;
alloc = NULL;
}

You may be lucky if you don't get a dump if the code is without alloc = NULL.
 
Sometimes the above sequence too fails. What to do, then?
Before deallocating the above region, reallocate the region ( you may use 'C' realloc for that)with a different quanta of memory and delete the allocation. It works !!
 

Regards
Sreekanth Muralidharan

 
Sreekanth Muralidharan,
Corporate Systems Consultant [Embedded Systems],
INDIA
GeneralRe: Solution for possible bug with delete Pinmemberlenux27-Feb-08 22:00 
Generalactivation key Pinmemberchhavir27-Jul-05 23:17 
General&quot;new&quot; error Pinmemberkurtak9-Mar-05 0:22 
GeneralRe: &amp;quot;new&amp;quot; error PinmemberSreekanth Muralidharan8-Dec-05 22:59 
GeneralReports wrong filename (and line number) Pinsusspolgie27-May-04 23:58 
GeneralRe: Reports wrong filename (and line number) PinmemberSreekanth Muralidharan1-Dec-05 17:39 
GeneralNow its ready for WCE MFC. PinmemberPiotr Boguslawski24-Nov-03 2:56 
GeneralRe: Now its ready for WCE MFC. Pinmemberjasonpkuphy17-May-05 0:15 
GeneralRe: Now its ready for WCE MFC. PinmemberTommyknocker19806-Oct-05 23:52 
JokeRe: Now its ready for WCE MFC. Pinmemberponey23-Mar-06 0:00 
GeneralRe: Now its ready for WCE MFC. Pinmemberbsyossi14-Jan-07 23:31 
GeneralIn Mfc ,it report inexistent memory leak Pinmemberjasonpkuphy25-Aug-03 18:22 
GeneralRe: In Mfc ,it report inexistent memory leak Pinmemberjasonpkuphy25-Aug-03 18:45 
Questionhow to use Pinmembersillychai25-Dec-02 0:30 
Generalwriting a task manager in c++ PinsussPhienix20-Oct-02 12:22 
GeneralRe: writing a task manager in c++ PinmemberSreekanth Muralidharan8-Dec-05 18:11 
GeneralError during debug PinsussAnonymous11-Oct-02 1:20 

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