You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
50 lines
1.5 KiB
50 lines
1.5 KiB
================
|
|
LeakSanitizer
|
|
================
|
|
|
|
.. contents::
|
|
:local:
|
|
|
|
Introduction
|
|
============
|
|
|
|
LeakSanitizer is a run-time memory leak detector. It can be combined with
|
|
:doc:`AddressSanitizer` to get both memory error and leak detection, or
|
|
used in a stand-alone mode. LSan adds almost no performance overhead
|
|
until the very end of the process, at which point there is an extra leak
|
|
detection phase.
|
|
|
|
Usage
|
|
=====
|
|
|
|
LeakSanitizer is supported on x86\_64 Linux and macOS. In order to use it,
|
|
simply build your program with :doc:`AddressSanitizer`:
|
|
|
|
.. code-block:: console
|
|
|
|
$ cat memory-leak.c
|
|
#include <stdlib.h>
|
|
void *p;
|
|
int main() {
|
|
p = malloc(7);
|
|
p = 0; // The memory is leaked here.
|
|
return 0;
|
|
}
|
|
% clang -fsanitize=address -g memory-leak.c ; ASAN_OPTIONS=detect_leaks=1 ./a.out
|
|
==23646==ERROR: LeakSanitizer: detected memory leaks
|
|
Direct leak of 7 byte(s) in 1 object(s) allocated from:
|
|
#0 0x4af01b in __interceptor_malloc /projects/compiler-rt/lib/asan/asan_malloc_linux.cc:52:3
|
|
#1 0x4da26a in main memory-leak.c:4:7
|
|
#2 0x7f076fd9cec4 in __libc_start_main libc-start.c:287
|
|
SUMMARY: AddressSanitizer: 7 byte(s) leaked in 1 allocation(s).
|
|
|
|
To use LeakSanitizer in stand-alone mode, link your program with
|
|
``-fsanitize=leak`` flag. Make sure to use ``clang`` (not ``ld``) for the
|
|
link step, so that it would link in proper LeakSanitizer run-time library
|
|
into the final executable.
|
|
|
|
More Information
|
|
================
|
|
|
|
`<https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer>`_
|