зеркало из https://github.com/mozilla/gecko-dev.git
118 строки
3.1 KiB
Perl
Executable File
118 строки
3.1 KiB
Perl
Executable File
#!/usr/bin/perl -w
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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# This tool is used to construct the ``type inference'' file. It
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# prints the total number of bytes that are attributed to a type that
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# cannot be inferred, grouped by stack trace; e.g.,
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#
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# (100) PR_Malloc
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# (50) foo
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# (50) foo2::foo2
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# (25) bar
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# (25) baz
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# (50) __builtin_new
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# (50) foo2::foo2
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#
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#
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# Which indicates that 100 bytes were allocated by uninferrable
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# classes via PR_Malloc(). Of that 100 bytes, 50 were allocated from
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# calls by foo(), 25 from calls by bar(), and 25 from calls by baz().
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# 50 bytes were allocated by __builtin_new from foo2's ctor.
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#
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#
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# From this, we might be able to infer the type of the object that was
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# created by examining the PR_Malloc() usage in foo() and the
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# ::operator new() usage in foo2(), and could add new type inference
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# rules; e.g.,
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#
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# <unclassified-string>
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# foo
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# foo2
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#
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# # Attribute ::operator new() usage in foo2's ctor to foo2
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# <foo2>
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# __builtin_new
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# foo2::foo2
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use 5.004;
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use strict;
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use Getopt::Long;
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# So we can find TraceMalloc.pm
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use FindBin;
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use lib "$FindBin::Bin";
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use TraceMalloc;
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# Collect program options
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$::opt_help = 0;
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$::opt_depth = 10;
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$::opt_types = "${FindBin::Bin}/types.dat";
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GetOptions("help", "depth=n", "types=s");
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if ($::opt_help) {
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die "usage: uncategorized.pl [options] <dumpfile>
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--help Display this message
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--depth=<n> Display at most <n> stack frames
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--types=<file> Read type heuristics from <file>";
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}
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# Initialize type inference juju from the type file specified by
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# ``--types''.
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TraceMalloc::init_type_inference($::opt_types);
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# Read the objects from the dump file. For each object, remember up to
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# ``--depth'' stack frames (from the top). Thread together common
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# stack prefixes, accumulating the number of bytes attributed to the
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# prefix.
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# This'll hold the inverted stacks
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$::Stacks = { '#bytes#' => 0 };
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sub collect_stacks($) {
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my ($object) = @_;
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my $stack = $object->{'stack'};
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return unless ($object->{'type'} eq 'void*') && (TraceMalloc::infer_type($stack) eq 'void*');
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my $count = 0;
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my $link = \%::Stacks;
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FRAME: foreach my $frame (@$stack) {
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last FRAME unless $count++ < $::opt_depth;
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$link->{'#bytes#'} += $object->{'size'};
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$link->{$frame} = { '#bytes#' => 0 } unless $link->{$frame};
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$link = $link->{$frame};
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}
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}
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TraceMalloc::read(\&collect_stacks);
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# Do a depth-first walk of the inverted stack tree.
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sub walk($$) {
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my ($links, $indent) = @_;
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my @keys;
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KEY: foreach my $key (keys %$links) {
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next KEY if $key eq '#bytes#';
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$keys[$#keys + 1] = $key;
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}
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foreach my $key (sort { $links->{$b}->{'#bytes#'} <=> $links->{$a}->{'#bytes#'} } @keys) {
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for (my $i = 0; $i < $indent; ++$i) {
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print " ";
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}
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print "($links->{$key}->{'#bytes#'}) $key\n";
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walk($links->{$key}, $indent + 1);
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}
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}
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walk(\%::Stacks, 0);
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