/usr/bin/cg_diff is in valgrind 1:3.13.0-2ubuntu2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 | #! /usr/bin/perl
##--------------------------------------------------------------------##
##--- Cachegrind's differencer. cg_diff.in ---##
##--------------------------------------------------------------------##
# This file is part of Cachegrind, a Valgrind tool for cache
# profiling programs.
#
# Copyright (C) 2002-2017 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 = "3.13.0";
# 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) 2002-2017 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 ---##
##--------------------------------------------------------------------##
|