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208 lines
6.4 KiB
Perl
Executable File
208 lines
6.4 KiB
Perl
Executable File
#!/usr/bin/perl -w
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# vim:cindent:ts=8:et:sw=4:
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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 script produces a diff between two files that are the result of
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# calling NS_TraceMallocDumpAllocations. Such files can be created
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# through the command-line option --shutdown-leaks=<filename> or through
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# the DOM function window.TraceMallocDumpAllocations(<filename>). Both
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# methods will work only if --trace-malloc=<malloc-log> is also given on
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# the command line.
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use 5.004;
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use strict;
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use Getopt::Long;
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$::opt_help = 0;
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$::opt_depth = 6;
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$::opt_include_zero = 0;
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$::opt_allocation_count = 0;
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$::opt_use_address = 0;
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# XXX Change --use-address to be the default and remove the option
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# once tinderbox is no longer using it without --use-address.
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Getopt::Long::Configure("pass_through");
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Getopt::Long::GetOptions("help", "allocation-count", "depth=i",
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"include-zero", "use-address");
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if ($::opt_help) {
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die "usage: diffbloatdump.pl [options] <dump1> <dump2>
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--help Display this message
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--allocation-count Use allocation count rather than size (i.e., treat
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all sizes as 1).
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--depth=<num> Only display <num> frames at top of allocation stack.
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--include-zero Display subtrees totalling zero.
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--use-address Don't ignore the address part of the stack trace
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(can make comparison more accurate when comparing
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results from the same build)
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The input files (<dump1> and <dump2> above) are either trace-malloc
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memory dumps OR this script's output. (If this script's output,
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--allocation-count and --use-address are ignored.) If the input files
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have .gz or .bz2 extension, they are uncompressed.
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";
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}
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my $calltree = { count => 0 }; # leave children undefined
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sub get_child($$) {
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my ($node, $frame) = @_;
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if (!defined($node->{children})) {
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$node->{children} = {};
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}
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if (!defined($node->{children}->{$frame})) {
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$node->{children}->{$frame} = { count => 0 };
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}
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return $node->{children}->{$frame};
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}
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sub add_tree_file($$$) {
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my ($infile, $firstline, $factor) = @_;
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my @nodestack;
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$nodestack[1] = $calltree;
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$firstline =~ /^(-?\d+) malloc$/;
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$calltree->{count} += $1 * $factor;
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my $lineno = 1;
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while (!eof($infile)) {
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my $line = <$infile>;
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++$lineno;
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$line =~ /^( *)(-?\d+) (.*)$/ || die "malformed input, line $lineno";
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my $depth = length($1);
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my $count = $2;
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my $frame = $3;
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die "malformed input, line $lineno" if ($depth % 2 != 0);
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$depth /= 2;
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die "malformed input, line $lineno" if ($depth > $#nodestack);
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$#nodestack = $depth;
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my $node = get_child($nodestack[$depth], $frame);
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push @nodestack, $node;
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$node->{count} += $count * $factor;
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}
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}
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sub add_file($$) {
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# Takes (1) a reference to a file descriptor for input and (2) the
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# factor to multiply the stacks by (generally +1 or -1).
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# Returns a reference to an array representing the stack, allocation
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# site in array[0].
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sub read_stack($) {
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my ($infile) = @_;
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my $line;
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my @stack;
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# read the data at the memory location
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while ( defined($infile) && ($line = <$infile>) && substr($line,0,1) eq "\t" ) {
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# do nothing
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}
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# read the stack
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do {
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chomp($line);
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if ( ! $::opt_use_address &&
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$line =~ /(.*)\[(.*)\]/) {
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$line = $1;
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}
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$stack[$#stack+1] = $line;
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} while ( defined($infile) && ($line = <$infile>) && $line ne "\n" && $line ne "\r\n" );
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return \@stack;
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}
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# adds the stack given as a parameter (reference to array, $stack[0] is
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# allocator) to $calltree, with the call count multiplied by $factor
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# (typically +1 or -1).
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sub add_stack($$) {
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my @stack = @{$_[0]};
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my $factor = $_[1];
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my $i = 0;
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my $node = $calltree;
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while ($i < $#stack && $i < $::opt_depth) {
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$node->{count} += $factor;
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$node = get_child($node, $stack[$i]);
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++$i;
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}
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$node->{count} += $factor;
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}
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my ($infile, $factor) = @_;
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if ($infile =~ /\.bz2$/) {
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# XXX This doesn't propagate errors from bzip2.
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open (INFILE, "bzip2 -cd '$infile' |") || die "Can't open input \"$infile\"";
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} elsif ($infile =~ /\.gz$/) {
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# XXX This doesn't propagate errors from gzip.
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open (INFILE, "gzip -cd '$infile' |") || die "Can't open input \"$infile\"";
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} else {
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open (INFILE, "<$infile") || die "Can't open input \"$infile\"";
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}
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my $first = 1;
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while ( ! eof(INFILE) ) {
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# read the type and address
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my $line = <INFILE>;
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if ($first) {
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$first = 0;
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if ($line =~ /^-?\d+ malloc$/) {
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# We're capable of reading in our own output as well.
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add_tree_file(\*INFILE, $line, $factor);
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close INFILE;
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return;
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}
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}
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unless ($line =~ /.*\((\d*)\)[\r|\n]/) {
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die "badly formed allocation header in $infile";
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}
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my $size;
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if ($::opt_allocation_count) {
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$size = 1;
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} else {
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$size = $1;
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}
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add_stack(read_stack(\*INFILE), $size * $factor);
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}
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close INFILE;
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}
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sub print_node_indent($$$);
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sub print_calltree() {
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sub print_indent($) {
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my ($i) = @_;
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while (--$i >= 0) {
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print " ";
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}
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}
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sub print_node_indent($$$) {
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my ($nodename, $node, $indent) = @_;
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if (!$::opt_include_zero && $node->{count} == 0) {
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return;
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}
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print_indent($indent);
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print "$node->{count} $nodename\n";
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if (defined($node->{children})) {
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my %kids = %{$node->{children}};
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++$indent;
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foreach my $kid (sort { $kids{$b}->{count} <=> $kids{$a}->{count} }
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keys (%kids)) {
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print_node_indent($kid, $kids{$kid}, $indent);
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}
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}
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}
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print_node_indent("malloc", $calltree, 0);
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}
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add_file($ARGV[0], -1);
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add_file($ARGV[1], 1);
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print_calltree();
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