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Improved heap diagnostics [message #14822]

Sun, 16 March 2008 15:47

mirek
Messages: 14255
Registered: November 2005

Ultimate Member

Debug mode heap diagnostics improved. Write before/past block checks are now more accurate.

Memory leaks now list a "memory breakpoint" value. Add this value to commandline (e.g. "--memory-breakpoint__ 107749") and the U++ will stop at corresponding "new" statement with segmentation fault (something you can catch with debugger and see the call stack). (Of course, if you are about to detect the real culprit, the code must do exactly the same thing..)

Also:

void MemoryIgnoreLeaksBegin();
void MemoryIgnoreLeaksEnd();

supress any memory allocated in between to be considered a memory leak. This can be nested and is thread specific.

Mirek

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Re: Improved heap diagnostics [message #14823 is a reply to message #14822]

Sun, 16 March 2008 17:51

masu
Messages: 378
Registered: February 2006

Senior Member

Hi Mirek,

FreeBSD does not have flag MAP_ANONYMOUS, but MAP_ANON, so we have to distinguish it from PLATFORM_POSIX.

Matthias

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Re: Improved heap diagnostics [message #14824 is a reply to message #14823]

Sun, 16 March 2008 19:14

mirek
Messages: 14255
Registered: November 2005

Ultimate Member

Like this:

void *SysAllocRaw(size_t size)
{
	LTIMING("SysAllocRaw");
	if(sPeak) *sPeak = MemoryProfile();
	sKB += int(((size + 4095) & ~4095) >> 10);
#ifdef PLATFORM_WIN32
	void *ptr = VirtualAlloc(NULL, size, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
#else
#ifdef PLATFORM_LINUX
	void *ptr =  mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
#else
	void *ptr =  mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
#endif
#endif
	if(!ptr)
		Panic("Out of memory!");
	return ptr;
}

?

Mirek

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