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#!/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";
}