Re: Purify?
Re: Purify?
- Subject: Re: Purify?
- From: Dave Thorup <email@hidden>
- Date: Fri, 19 Nov 2004 10:37:56 -0500
Sorry, I sent the last message to the wrong list. Please ignore.
_____________________________
Dave Thorup
Software Engineer
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On Nov 19, 2004, at 10:24 AM, Dave Thorup wrote:
On Nov 19, 2004, at 7:49 AM, Patrick Coskren wrote:
On Nov 18, 2004, at 11:01 PM, Rhys Hill wrote:
Hi Jeff,
Assuming you're talking about IBM Rational Purify, you can use
libgmallocdebug to
find memory corruption, which is easily enabled within XCode. For
leaks, there are
ObjectAlloc and MallocDebug.
Those are good, but do they really cover quite the same ground as
Purify? I'd love to see a port of valgrind, the open-source
equivalent, to the Mac.
Well, what is it exactly that you want from these tools? Do a "man
libgmalloc" in the Terminal to see what Guard Malloc does for you.
Here's an excerpt from that:
------------------------------------
libgmalloc is a debugging malloc library that can track down insidious
bugs in your code or library. If your application crashes when using
libgmalloc, then you've found a bug.
libgmalloc uses the virtual memory system to identify such bugs. Each
malloc allocation is placed on its own virtual memory page, with the
end
of the buffer at the end of the page's memory, and the next page is
kept
unallocated. As a result, accesses beyond the end of the buffer cause
a
bus error immediately. When memory is freed, libgmalloc deallocates
its
virtual memory, causing reads or writes to the freed buffer cause a bus
error. Thus, nasty, hard-to-track-down bugs are immediately obvious,
and
you'll know exactly which code is causing the problem. This is thread-
safe and works for all uses of malloc(), NXZoneMalloc(),
NSZoneMalloc(),
and friends.
------------------------------------
From what I've used of Guard Malloc it's a great, heavy duty tool to
help you track down memory bugs. And if your looking for the
profiling features of Purity or valgrind, nothing beats Shark.
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