gecko-dev/tools/trace-malloc/histogram.pl
2012-05-21 12:12:37 +01:00

65 lines
1.7 KiB
Perl
Executable File

#!/usr/bin/perl -w
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
# This program produces a ``class histogram'' of the live objects, one
# line per class, with the total number of objects allocated, and
# total number of bytes attributed to those objects.
use 5.004;
use strict;
use Getopt::Long;
# So we can find TraceMalloc.pm
use FindBin;
use lib "$FindBin::Bin";
use TraceMalloc;
# Collect program options
$::opt_help = 0;
$::opt_types = "${FindBin::Bin}/types.dat";
GetOptions("help", "types=s");
if ($::opt_help) {
die "usage: histogram.pl [options] <dumpfile>
--help Display this message
--types=<file> Read type heuristics from <file>";
}
# Initialize type inference juju from the type file specified by
# ``--types''.
if ($::opt_types) {
TraceMalloc::init_type_inference($::opt_types);
}
# Read the dump file, collecting count and size information for each
# object that's detected.
# This'll hold a record for each class that we detect
$::Classes = { };
sub collect_objects($) {
my ($object) = @_;
my $type = $object->{'type'};
my $entry = $::Classes{$type};
if (! $entry) {
$entry = $::Classes{$type} = { '#count#' => 0, '#bytes#' => 0 };
}
$entry->{'#count#'} += 1;
$entry->{'#bytes#'} += $object->{'size'};
}
TraceMalloc::read(\&collect_objects);
# Print one line per class, sorted with the classes that accumulated
# the most bytes first.
foreach my $class (sort { $::Classes{$b}->{'#bytes#'} <=> $::Classes{$a}->{'#bytes#'} } keys %::Classes) {
print "$class $::Classes{$class}->{'#count#'} $::Classes{$class}->{'#bytes#'}\n";
}