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#! /usr/bin/perl
##--------------------------------------------------------------------##
##--- Cachegrind's differencer. cg_diff.in ---##
##--------------------------------------------------------------------##
# This file is part of Cachegrind, a Valgrind tool for cache
# profiling programs.
#
# Copyright (C) 2002-2010 Nicholas Nethercote
# njn@valgrind.org
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
# 02111-1307, USA.
#
# The GNU General Public License is contained in the file COPYING.
#----------------------------------------------------------------------------
# This is a very cut-down and modified version of cg_annotate.
#----------------------------------------------------------------------------
use warnings;
use strict;
#----------------------------------------------------------------------------
# Global variables
#----------------------------------------------------------------------------
# Version number
my $version = "3.8.1";
# Usage message.
my $usage = <<END
usage: cg_diff [options] <cachegrind-out-file1> <cachegrind-out-file2>
options for the user, with defaults in [ ], are:
-h --help show this message
-v --version show version
--mod-filename=<expr> a Perl search-and-replace expression that is applied
to filenames, eg. --mod-filename='s/prog[0-9]/projN/'
--mod-funcname=<expr> like --mod-filename, but applied to function names
cg_diff is Copyright (C) 2010-2010 Nicholas Nethercote.
and licensed under the GNU General Public License, version 2.
Bug reports, feedback, admiration, abuse, etc, to: njn\@valgrind.org.
END
;
# --mod-filename expression
my $mod_filename = undef;
# --mod-funcname expression
my $mod_funcname = undef;
#-----------------------------------------------------------------------------
# Argument and option handling
#-----------------------------------------------------------------------------
sub process_cmd_line()
{
my ($file1, $file2) = (undef, undef);
for my $arg (@ARGV) {
if ($arg =~ /^-/) {
# --version
if ($arg =~ /^-v$|^--version$/) {
die("cg_diff-$version\n");
} elsif ($arg =~ /^--mod-filename=(.*)/) {
$mod_filename = $1;
} elsif ($arg =~ /^--mod-funcname=(.*)/) {
$mod_funcname = $1;
} else { # -h and --help fall under this case
die($usage);
}
} elsif (not defined($file1)) {
$file1 = $arg;
} elsif (not defined($file2)) {
$file2 = $arg;
} else {
die($usage);
}
}
# Must have specified two input files.
if (not defined $file1 or not defined $file2) {
die($usage);
}
return ($file1, $file2);
}
#-----------------------------------------------------------------------------
# Reading of input file
#-----------------------------------------------------------------------------
sub max ($$)
{
my ($x, $y) = @_;
return ($x > $y ? $x : $y);
}
# Add the two arrays; any '.' entries are ignored. Two tricky things:
# 1. If $a2->[$i] is undefined, it defaults to 0 which is what we want; we turn
# off warnings to allow this. This makes things about 10% faster than
# checking for definedness ourselves.
# 2. We don't add an undefined count or a ".", even though it's value is 0,
# because we don't want to make an $a2->[$i] that is undef become 0
# unnecessarily.
sub add_array_a_to_b ($$)
{
my ($a, $b) = @_;
my $n = max(scalar @$a, scalar @$b);
$^W = 0;
foreach my $i (0 .. $n-1) {
$b->[$i] += $a->[$i] if (defined $a->[$i] && "." ne $a->[$i]);
}
$^W = 1;
}
sub sub_array_b_from_a ($$)
{
my ($a, $b) = @_;
my $n = max(scalar @$a, scalar @$b);
$^W = 0;
foreach my $i (0 .. $n-1) {
$a->[$i] -= $b->[$i]; # XXX: doesn't handle '.' entries
}
$^W = 1;
}
# Add each event count to the CC array. '.' counts become undef, as do
# missing entries (implicitly).
sub line_to_CC ($$)
{
my ($line, $numEvents) = @_;
my @CC = (split /\s+/, $line);
(@CC <= $numEvents) or die("Line $.: too many event counts\n");
return \@CC;
}
sub read_input_file($)
{
my ($input_file) = @_;
open(INPUTFILE, "< $input_file")
|| die "Cannot open $input_file for reading\n";
# Read "desc:" lines.
my $desc;
my $line;
while ($line = <INPUTFILE>) {
if ($line =~ s/desc:\s+//) {
$desc .= $line;
} else {
last;
}
}
# Read "cmd:" line (Nb: will already be in $line from "desc:" loop above).
($line =~ s/^cmd:\s+//) or die("Line $.: missing command line\n");
my $cmd = $line;
chomp($cmd); # Remove newline
# Read "events:" line. We make a temporary hash in which the Nth event's
# value is N, which is useful for handling --show/--sort options below.
$line = <INPUTFILE>;
(defined $line && $line =~ s/^events:\s+//)
or die("Line $.: missing events line\n");
my @events = split(/\s+/, $line);
my $numEvents = scalar @events;
my $currFileName;
my $currFileFuncName;
my %CCs; # hash("$filename#$funcname" => CC array)
my $currCC = undef; # CC array
my $summaryCC;
# Read body of input file.
while (<INPUTFILE>) {
s/#.*$//; # remove comments
if (s/^(\d+)\s+//) {
my $CC = line_to_CC($_, $numEvents);
defined($currCC) || die;
add_array_a_to_b($CC, $currCC);
} elsif (s/^fn=(.*)$//) {
defined($currFileName) || die;
my $tmpFuncName = $1;
if (defined $mod_funcname) {
eval "\$tmpFuncName =~ $mod_funcname";
}
$currFileFuncName = "$currFileName#$tmpFuncName";
$currCC = $CCs{$currFileFuncName};
if (not defined $currCC) {
$currCC = [];
$CCs{$currFileFuncName} = $currCC;
}
} elsif (s/^fl=(.*)$//) {
$currFileName = $1;
if (defined $mod_filename) {
eval "\$currFileName =~ $mod_filename";
}
# Assume that a "fn=" line is followed by a "fl=" line.
$currFileFuncName = undef;
} elsif (s/^\s*$//) {
# blank, do nothing
} elsif (s/^summary:\s+//) {
$summaryCC = line_to_CC($_, $numEvents);
(scalar(@$summaryCC) == @events)
or die("Line $.: summary event and total event mismatch\n");
} else {
warn("WARNING: line $. malformed, ignoring\n");
}
}
# Check if summary line was present
if (not defined $summaryCC) {
die("missing final summary line, aborting\n");
}
close(INPUTFILE);
return ($cmd, \@events, \%CCs, $summaryCC);
}
#----------------------------------------------------------------------------
# "main()"
#----------------------------------------------------------------------------
# Commands seen in the files. Need not match.
my $cmd1;
my $cmd2;
# Events seen in the files. They must match.
my $events1;
my $events2;
# Individual CCs, organised by filename/funcname/line_num.
# hashref("$filename#$funcname", CC array)
my $CCs1;
my $CCs2;
# Total counts for summary (an arrayref).
my $summaryCC1;
my $summaryCC2;
#----------------------------------------------------------------------------
# Read the input files
#----------------------------------------------------------------------------
my ($file1, $file2) = process_cmd_line();
($cmd1, $events1, $CCs1, $summaryCC1) = read_input_file($file1);
($cmd2, $events2, $CCs2, $summaryCC2) = read_input_file($file2);
#----------------------------------------------------------------------------
# Check the events match
#----------------------------------------------------------------------------
my $n = max(scalar @$events1, scalar @$events2);
$^W = 0; # turn off warnings, because we might hit undefs
foreach my $i (0 .. $n-1) {
($events1->[$i] eq $events2->[$i]) || die "events don't match, aborting\n";
}
$^W = 1;
#----------------------------------------------------------------------------
# Do the subtraction: CCs2 -= CCs1
#----------------------------------------------------------------------------
while (my ($filefuncname, $CC1) = each(%$CCs1)) {
my $CC2 = $CCs2->{$filefuncname};
if (not defined $CC2) {
$CC2 = [];
sub_array_b_from_a($CC2, $CC1); # CC2 -= CC1
$CCs2->{$filefuncname} = $CC2;
} else {
sub_array_b_from_a($CC2, $CC1); # CC2 -= CC1
}
}
sub_array_b_from_a($summaryCC2, $summaryCC1);
#----------------------------------------------------------------------------
# Print the result, in CCs2
#----------------------------------------------------------------------------
print("desc: Files compared: $file1; $file2\n");
print("cmd: $cmd1; $cmd2\n");
print("events: ");
for my $e (@$events1) {
print(" $e");
}
print("\n");
while (my ($filefuncname, $CC) = each(%$CCs2)) {
my @x = split(/#/, $filefuncname);
(scalar @x == 2) || die;
print("fl=$x[0]\n");
print("fn=$x[1]\n");
print("0");
foreach my $n (@$CC) {
print(" $n");
}
print("\n");
}
print("summary:");
foreach my $n (@$summaryCC2) {
print(" $n");
}
print("\n");
##--------------------------------------------------------------------##
##--- end ---##
##--------------------------------------------------------------------##