mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-01 06:35:42 +00:00
118 lines
3.1 KiB
Perl
Executable File
118 lines
3.1 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 tool is used to construct the ``type inference'' file. It
|
|
# prints the total number of bytes that are attributed to a type that
|
|
# cannot be inferred, grouped by stack trace; e.g.,
|
|
#
|
|
# (100) PR_Malloc
|
|
# (50) foo
|
|
# (50) foo2::foo2
|
|
# (25) bar
|
|
# (25) baz
|
|
# (50) __builtin_new
|
|
# (50) foo2::foo2
|
|
#
|
|
#
|
|
# Which indicates that 100 bytes were allocated by uninferrable
|
|
# classes via PR_Malloc(). Of that 100 bytes, 50 were allocated from
|
|
# calls by foo(), 25 from calls by bar(), and 25 from calls by baz().
|
|
# 50 bytes were allocated by __builtin_new from foo2's ctor.
|
|
#
|
|
#
|
|
# From this, we might be able to infer the type of the object that was
|
|
# created by examining the PR_Malloc() usage in foo() and the
|
|
# ::operator new() usage in foo2(), and could add new type inference
|
|
# rules; e.g.,
|
|
#
|
|
# <unclassified-string>
|
|
# foo
|
|
# foo2
|
|
#
|
|
# # Attribute ::operator new() usage in foo2's ctor to foo2
|
|
# <foo2>
|
|
# __builtin_new
|
|
# foo2::foo2
|
|
|
|
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_depth = 10;
|
|
$::opt_types = "${FindBin::Bin}/types.dat";
|
|
GetOptions("help", "depth=n", "types=s");
|
|
|
|
if ($::opt_help) {
|
|
die "usage: uncategorized.pl [options] <dumpfile>
|
|
--help Display this message
|
|
--depth=<n> Display at most <n> stack frames
|
|
--types=<file> Read type heuristics from <file>";
|
|
}
|
|
|
|
# Initialize type inference juju from the type file specified by
|
|
# ``--types''.
|
|
TraceMalloc::init_type_inference($::opt_types);
|
|
|
|
# Read the objects from the dump file. For each object, remember up to
|
|
# ``--depth'' stack frames (from the top). Thread together common
|
|
# stack prefixes, accumulating the number of bytes attributed to the
|
|
# prefix.
|
|
|
|
# This'll hold the inverted stacks
|
|
$::Stacks = { '#bytes#' => 0 };
|
|
|
|
sub collect_stacks($) {
|
|
my ($object) = @_;
|
|
my $stack = $object->{'stack'};
|
|
|
|
return unless ($object->{'type'} eq 'void*') && (TraceMalloc::infer_type($stack) eq 'void*');
|
|
|
|
my $count = 0;
|
|
my $link = \%::Stacks;
|
|
FRAME: foreach my $frame (@$stack) {
|
|
last FRAME unless $count++ < $::opt_depth;
|
|
|
|
$link->{'#bytes#'} += $object->{'size'};
|
|
$link->{$frame} = { '#bytes#' => 0 } unless $link->{$frame};
|
|
$link = $link->{$frame};
|
|
}
|
|
}
|
|
|
|
TraceMalloc::read(\&collect_stacks);
|
|
|
|
# Do a depth-first walk of the inverted stack tree.
|
|
|
|
sub walk($$) {
|
|
my ($links, $indent) = @_;
|
|
|
|
my @keys;
|
|
KEY: foreach my $key (keys %$links) {
|
|
next KEY if $key eq '#bytes#';
|
|
$keys[$#keys + 1] = $key;
|
|
}
|
|
|
|
foreach my $key (sort { $links->{$b}->{'#bytes#'} <=> $links->{$a}->{'#bytes#'} } @keys) {
|
|
for (my $i = 0; $i < $indent; ++$i) {
|
|
print " ";
|
|
}
|
|
|
|
print "($links->{$key}->{'#bytes#'}) $key\n";
|
|
|
|
walk($links->{$key}, $indent + 1);
|
|
}
|
|
}
|
|
|
|
walk(\%::Stacks, 0);
|
|
|