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