Test::LeakTrace - Traces memory leaks
This document describes Test::LeakTrace version 0.17.
use Test::LeakTrace; # simple report leaktrace{ # ... }; # verbose output leaktrace{ # ... } -verbose; # with callback leaktrace{ # ... } sub { my($ref, $file, $line) = @_; warn "leaked $ref from $file line\n"; }; my @refs = leaked_refs{ # ... }; my @info = leaked_info{ # ... }; my $count = leaked_count{ # ... }; # standard test interface use Test::LeakTrace; no_leaks_ok{ # ... } 'no memory leaks'; leaks_cmp_ok{ # ... } '<', 10;
Test::LeakTrace provides several functions that trace memory leaks. This module scans arenas, the memory allocation system, so it can detect any leaked SVs in given blocks.
Test::LeakTrace
Leaked SVs are SVs which are not released after the end of the scope they have been created. These SVs include global variables and internal caches. For example, if you call a method in a tracing block, perl might prepare a cache for the method. Thus, to trace true leaks, no_leaks_ok() and leaks_cmp_ok() executes a block more than once.
no_leaks_ok()
leaks_cmp_ok()
leaked_info { BLOCK }
Executes BLOCK and returns a list of leaked SVs and places where the SVs come from, i.e. [$ref, $file, $line].
[$ref, $file, $line]
leaked_refs { BLOCK }
Executes BLOCK and returns a list of leaked SVs.
leaked_count { BLOCK }
Executes BLOCK and returns the number of leaked SVs.
leaktrace { BLOCK } ?($mode | \&callback)
Executes BLOCK and reports leaked SVs to *STDERR.
*STDERR
Defined $modes are:
Default. Reports the leaked SV identity (type and address), file name and line number.
In addition to -simple, dumps the sv content using sv_dump(), which also implements Devel::Peek::Dump().
sv_dump()
Devel::Peek::Dump()
In addition to -simple, prints suspicious source lines.
Both -sv_dump and -lines.
no_leaks_ok { BLOCK } ?$description
Tests that BLOCK does not leaks SVs. This is a test function using Test::Builder.
Test::Builder
Note that BLOCK is called more than once. This is because BLOCK might prepare caches which are not memory leaks.
leaks_cmp_ok { BLOCK } $cmp_op, $number, ?$description
Tests that BLOCK leaks a specific number of SVs. This is a test function using Test::Builder.
count_sv()
Counts all the SVs in the arena.
Like Devel::LeakTrace Test::LeakTrace::Script is provided for whole scripts.
Devel::LeakTrace
Test::LeakTrace::Script
The arguments of use Test::LeakTrace::Script directive is the same as leaktrace().
use Test::LeakTrace::Script
leaktrace()
$ TEST_LEAKTRACE=-sv_dump perl -MTest::LeakTrace::Script script.pl $ perl -MTest::LeakTrace::Script=-verbose script.pl #!perl # ... use Test::LeakTrace::Script sub{ my($ref, $file, $line) = @_; # ... }; # ...
Here is a test script template that checks memory leaks.
#!perl -w use strict; use constant HAS_LEAKTRACE => eval{ require Test::LeakTrace }; use Test::More HAS_LEAKTRACE ? (tests => 1) : (skip_all => 'require Test::LeakTrace'); use Test::LeakTrace; use Some::Module; leaks_cmp_ok{ my $o = Some::Module->new(); $o->something(); $o->something_else(); } '<', 1;
Perl 5.8.1 or later, and a C compiler.
Test::LeakTrace does not work with Devel::Cover and modules which install their own runops routines, or the perl executor. So if the test functions of this module detect strange runops routines, they do nothing and report okay.
Devel::Cover
runops
No bugs have been reported.
Please report any bugs or feature requests to the author.
Devel::LeakTrace.
Devel::LeakTrace::Fast.
Test::TraceObject.
Test::Weak.
For guts:
perlguts.
perlhack.
sv.c.
Goro Fuji(gfx) <gfuji(at)cpan.org>.
Copyright (c) 2009-2010, Goro Fuji(gfx). All rights reserved.
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
To install Test::LeakTrace, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Test::LeakTrace
CPAN shell
perl -MCPAN -e shell install Test::LeakTrace
For more information on module installation, please visit the detailed CPAN module installation guide.