From: "Kaz Kylheku" <kaz@zeugmasystems.com>
To: "Srivatsan Ramanujam" <juggernautvatsan@yahoo.com>,
<gcc-help@gcc.gnu.org>
Subject: RE: Valgrind - exact leak location.
Date: Thu, 26 Oct 2006 16:06:00 -0000 [thread overview]
Message-ID: <66910A579C9312469A7DF9ADB54A8B7D418250@exchange.ZeugmaSystems.local> (raw)
> Hi People,
>
> I have been trying to run valgrind to detect leaks in
> my backend C++ algorithm.
But what valgrind has detected is an invalid read, not a leak.
> the rogue operation is being performed inside
> ABCParser::parseString() however this is a very big
> function and I am unable to painstakingly go thru it
> to find out the possible source of leak.
What leak? The routine is dereferencing an invalid pointer.
> Is there a way out? Can valgrind give me the exact
> line number in a file where the "invalid read"
> occured?
Let's look at it:
==9984== by 0x1B97AB4E: ABCParser::parseString() (stl_vector.h:501)
The invalid read did occur in stl_vector.h:501. But that is the middle
of an inlined function that was incorporated into the body of
parseString(). It doesn't have its own stack frame, which would give a
backtrace to the parent function.
Inlining is an optimization which, as you can see, can interfere with
debugging.
Have you thought of recompiling the code with inlining disabled?
> How can I make valgrind point out the exact location
> of the error in my code?
In what way is is the machine address 0x1B97AB4E not an exact location?
Compile with -g, and then use objdump -S to an assembly listing
annotated with the source code lines.
next reply other threads:[~2006-10-26 16:06 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-26 16:06 Kaz Kylheku [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-10-26 6:32 Srivatsan Ramanujam
2006-10-26 10:04 ` Andrew Haley
2006-10-26 11:44 ` William Gallafent
2006-10-26 11:57 ` Neil Ferguson
2006-10-26 12:10 ` Srivatsan Ramanujam
2006-10-26 12:25 ` Andrew Haley
2006-10-26 12:32 ` Srivatsan Ramanujam
2006-10-26 12:34 ` Andrew Haley
2006-10-26 12:37 ` Srivatsan Ramanujam
2006-10-26 12:38 ` John Love-Jensen
2006-10-26 12:40 ` Srivatsan Ramanujam
2006-10-26 12:14 ` Srivatsan Ramanujam
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