2 Test::Valgrind - Generate suppressions, analyse and test any command
9 # From the command-line
10 perl -MTest::Valgrind leaky.pl
12 # From the command-line, snippet style
13 perl -MTest::Valgrind -e 'leaky()'
17 eval 'use Test::Valgrind';
18 plan skip_all => 'Test::Valgrind is required to test your distribution with valgrind' if $@;
21 # In all the test files of a directory
22 prove --exec 'perl -Iblib/lib -Iblib/arch -MTest::Valgrind' t/*.t
25 This module is a front-end to the "Test::Valgrind::*" API that lets you
26 run Perl code through the "memcheck" tool of the "valgrind" memory
27 debugger, to test for memory errors and leaks. If they aren't available
28 yet, it will first generate suppressions for the current "perl"
29 interpreter and store them in the portable flavour of
30 ~/.perl/Test-Valgrind/suppressions/$VERSION. The actual run will then
31 take place, and tests will be passed or failed according to the result
34 The complete API is much more versatile than this. By declaring an
35 appropriate Test::Valgrind::Command class, you can run any executable
36 (that is, not only Perl scripts) under valgrind, generate the
37 corresponding suppressions on-the-fly and convert the analysis result to
38 TAP output so that it can be incorporated into your project's testsuite.
39 If you're not interested in producing TAP, you can output the results in
40 whatever format you like (for example HTML pages) by defining your own
41 Test::Valgrind::Action class.
43 Due to the nature of perl's memory allocator, this module can't track
44 leaks of Perl objects. This includes non-mortalized scalars and memory
45 cycles. However, it can track leaks of chunks of memory allocated in XS
46 extensions with "Newx" and friends or "malloc". As such, it's
47 complementary to the other very good leak detectors listed in the "SEE
52 Test::Valgrind->analyse(%options);
54 Run a "valgrind" analysis configured by %options :
56 * "command => $command"
58 The Test::Valgrind::Command object (or class name) to use.
60 Defaults to Test::Valgrind::Command::PerlScript.
64 The Test::Valgrind::Tool object (or class name) to use.
66 Defaults to Test::Valgrind::Tool::memcheck.
70 The Test::Valgrind::Action object (or class name) to use.
72 Defaults to Test::Valgrind::Action::Test.
76 The file name of the script to analyse.
78 Ignored if you supply your own custom "command", but mandatory
81 * "callers => $number"
83 Specify the maximum stack depth studied when valgrind encounters an
84 error. Raising this number improves granularity.
86 Ignored if you supply your own custom "tool", otherwise defaults to
91 If true, print the output of the test script as diagnostics.
93 Ignored if you supply your own custom "action", otherwise defaults
96 * "extra_supps => \@files"
98 Also use suppressions from @files besides "perl"'s.
102 * "no_def_supp => $bool"
104 If true, do not use the default suppression file.
109 use Test::Valgrind %options;
111 In the parent process, "import" calls "analyse" with the arguments it
112 received itself - except that if no "file" option was supplied, it tries
113 to pick the first caller context that looks like a script. When the
114 analysis ends, it exits with the status returned by the action (for the
115 default TAP-generator action, it's the number of failed tests).
117 In the child process, it just "return"s so that the calling code is
118 actually run under "valgrind", albeit two side-effects :
120 * Perl::Destruct::Level is loaded and the destruction level is set to
123 * Autoflush on "STDOUT" is turned on.
127 When set to true, all dynamic extensions that were loaded during the
128 analysis will be unloaded at "END" time by "dl_unload_file" in
131 Since this obfuscates error stack traces, it's disabled by default.
134 Perl 5.8 is notorious for leaking like there's no tomorrow, so the
135 suppressions are very likely not to be complete on it. You also have a
136 better chance to get more accurate results if your perl is built with
137 debugging enabled. Using the latest "valgrind" available will also help.
139 This module is not really secure. It's definitely not taint safe. That
140 shouldn't be a problem for test files.
142 What your tests output to "STDOUT" and "STDERR" is eaten unless you pass
143 the "diag" option, in which case it will be reprinted as diagnostics.
146 XML::Twig, version, File::HomeDir, Env::Sanctify, Perl::Destruct::Level.
149 All the "Test::Valgrind::*" API, including Test::Valgrind::Command,
150 Test::Valgrind::Tool, Test::Valgrind::Action and
151 Test::Valgrind::Session.
153 The valgrind(1) man page.
157 Devel::Leak, Devel::LeakTrace, Devel::LeakTrace::Fast.
160 Vincent Pit, "<perl at profvince.com>", <http://www.profvince.com>.
162 You can contact me by mail or on "irc.perl.org" (vincent).
165 Please report any bugs or feature requests to "bug-test-valgrind at
166 rt.cpan.org", or through the web interface at
167 <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-Valgrind>. I will
168 be notified, and then you'll automatically be notified of progress on
169 your bug as I make changes.
172 You can find documentation for this module with the perldoc command.
174 perldoc Test::Valgrind
177 Rafaƫl Garcia-Suarez, for writing and instructing me about the existence
178 of Perl::Destruct::Level (Elizabeth Mattijsen is a close second).
180 H.Merijn Brand, for daring to test this thing.
182 David Cantrell, for providing shell access to one of his smokers where
183 the tests were failing.
185 The debian-perl team, for offering all the feedback they could regarding
186 the build issues they met.
188 All you people that showed interest in this module, which motivated me
189 into completely rewriting it.
192 Copyright 2008,2009,2010,2011,2013 Vincent Pit, all rights reserved.
194 This program is free software; you can redistribute it and/or modify it
195 under the same terms as Perl itself.