3 ##--------------------------------------------------------------------##
4 ##--- Cachegrind's differencer. cg_diff.in ---##
5 ##--------------------------------------------------------------------##
7 # This file is part of Cachegrind, a Valgrind tool for cache
10 # Copyright (C) 2002-2017 Nicholas Nethercote
13 # This program is free software; you can redistribute it and/or
14 # modify it under the terms of the GNU General Public License as
15 # published by the Free Software Foundation; either version 2 of the
16 # License, or (at your option) any later version.
18 # This program is distributed in the hope that it will be useful, but
19 # WITHOUT ANY WARRANTY; without even the implied warranty of
20 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 # General Public License for more details.
23 # You should have received a copy of the GNU General Public License
24 # along with this program; if not, write to the Free Software
25 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
28 # The GNU General Public License is contained in the file COPYING.
30 #----------------------------------------------------------------------------
31 # This is a very cut-down and modified version of cg_annotate.
32 #----------------------------------------------------------------------------
37 #----------------------------------------------------------------------------
39 #----------------------------------------------------------------------------
42 my $version = "@VERSION@";
46 usage: cg_diff [options] <cachegrind-out-file1> <cachegrind-out-file2>
48 options for the user, with defaults in [ ], are:
49 -h --help show this message
50 -v --version show version
51 --mod-filename=<expr> a Perl search-and-replace expression that is applied
52 to filenames, eg. --mod-filename='s/prog[0-9]/projN/'
53 --mod-funcname=<expr> like --mod-filename, but applied to function names
55 cg_diff is Copyright (C) 2002-2017 Nicholas Nethercote.
56 and licensed under the GNU General Public License, version 2.
57 Bug reports, feedback, admiration, abuse, etc, to: njn\@valgrind.org.
62 # --mod-filename expression
63 my $mod_filename = undef;
65 # --mod-funcname expression
66 my $mod_funcname = undef;
68 #-----------------------------------------------------------------------------
69 # Argument and option handling
70 #-----------------------------------------------------------------------------
71 sub process_cmd_line()
73 my ($file1, $file2) = (undef, undef);
79 if ($arg =~ /^-v$|^--version$/) {
80 die("cg_diff-$version\n");
82 } elsif ($arg =~ /^--mod-filename=(.*)/) {
85 } elsif ($arg =~ /^--mod-funcname=(.*)/) {
88 } else { # -h and --help fall under this case
92 } elsif (not defined($file1)) {
95 } elsif (not defined($file2)) {
103 # Must have specified two input files.
104 if (not defined $file1 or not defined $file2) {
108 return ($file1, $file2);
111 #-----------------------------------------------------------------------------
112 # Reading of input file
113 #-----------------------------------------------------------------------------
117 return ($x > $y ? $x : $y);
120 # Add the two arrays; any '.' entries are ignored. Two tricky things:
121 # 1. If $a2->[$i] is undefined, it defaults to 0 which is what we want; we turn
122 # off warnings to allow this. This makes things about 10% faster than
123 # checking for definedness ourselves.
124 # 2. We don't add an undefined count or a ".", even though it's value is 0,
125 # because we don't want to make an $a2->[$i] that is undef become 0
127 sub add_array_a_to_b ($$)
131 my $n = max(scalar @$a, scalar @$b);
133 foreach my $i (0 .. $n-1) {
134 $b->[$i] += $a->[$i] if (defined $a->[$i] && "." ne $a->[$i]);
139 sub sub_array_b_from_a ($$)
143 my $n = max(scalar @$a, scalar @$b);
145 foreach my $i (0 .. $n-1) {
146 $a->[$i] -= $b->[$i]; # XXX: doesn't handle '.' entries
151 # Add each event count to the CC array. '.' counts become undef, as do
152 # missing entries (implicitly).
155 my ($line, $numEvents) = @_;
157 my @CC = (split /\s+/, $line);
158 (@CC <= $numEvents) or die("Line $.: too many event counts\n");
162 sub read_input_file($)
164 my ($input_file) = @_;
166 open(INPUTFILE, "< $input_file")
167 || die "Cannot open $input_file for reading\n";
169 # Read "desc:" lines.
172 while ($line = <INPUTFILE>) {
173 if ($line =~ s/desc:\s+//) {
180 # Read "cmd:" line (Nb: will already be in $line from "desc:" loop above).
181 ($line =~ s/^cmd:\s+//) or die("Line $.: missing command line\n");
183 chomp($cmd); # Remove newline
185 # Read "events:" line. We make a temporary hash in which the Nth event's
186 # value is N, which is useful for handling --show/--sort options below.
188 (defined $line && $line =~ s/^events:\s+//)
189 or die("Line $.: missing events line\n");
190 my @events = split(/\s+/, $line);
191 my $numEvents = scalar @events;
194 my $currFileFuncName;
196 my %CCs; # hash("$filename#$funcname" => CC array)
197 my $currCC = undef; # CC array
201 # Read body of input file.
202 while (<INPUTFILE>) {
203 s/#.*$//; # remove comments
205 my $CC = line_to_CC($_, $numEvents);
206 defined($currCC) || die;
207 add_array_a_to_b($CC, $currCC);
209 } elsif (s/^fn=(.*)$//) {
210 defined($currFileName) || die;
211 my $tmpFuncName = $1;
212 if (defined $mod_funcname) {
213 eval "\$tmpFuncName =~ $mod_funcname";
215 $currFileFuncName = "$currFileName#$tmpFuncName";
216 $currCC = $CCs{$currFileFuncName};
217 if (not defined $currCC) {
219 $CCs{$currFileFuncName} = $currCC;
222 } elsif (s/^fl=(.*)$//) {
224 if (defined $mod_filename) {
225 eval "\$currFileName =~ $mod_filename";
227 # Assume that a "fn=" line is followed by a "fl=" line.
228 $currFileFuncName = undef;
230 } elsif (s/^\s*$//) {
233 } elsif (s/^summary:\s+//) {
234 $summaryCC = line_to_CC($_, $numEvents);
235 (scalar(@$summaryCC) == @events)
236 or die("Line $.: summary event and total event mismatch\n");
239 warn("WARNING: line $. malformed, ignoring\n");
243 # Check if summary line was present
244 if (not defined $summaryCC) {
245 die("missing final summary line, aborting\n");
250 return ($cmd, \@events, \%CCs, $summaryCC);
253 #----------------------------------------------------------------------------
255 #----------------------------------------------------------------------------
256 # Commands seen in the files. Need not match.
260 # Events seen in the files. They must match.
264 # Individual CCs, organised by filename/funcname/line_num.
265 # hashref("$filename#$funcname", CC array)
269 # Total counts for summary (an arrayref).
273 #----------------------------------------------------------------------------
274 # Read the input files
275 #----------------------------------------------------------------------------
276 my ($file1, $file2) = process_cmd_line();
277 ($cmd1, $events1, $CCs1, $summaryCC1) = read_input_file($file1);
278 ($cmd2, $events2, $CCs2, $summaryCC2) = read_input_file($file2);
280 #----------------------------------------------------------------------------
281 # Check the events match
282 #----------------------------------------------------------------------------
283 my $n = max(scalar @$events1, scalar @$events2);
284 $^W = 0; # turn off warnings, because we might hit undefs
285 foreach my $i (0 .. $n-1) {
286 ($events1->[$i] eq $events2->[$i]) || die "events don't match, aborting\n";
290 #----------------------------------------------------------------------------
291 # Do the subtraction: CCs2 -= CCs1
292 #----------------------------------------------------------------------------
293 while (my ($filefuncname, $CC1) = each(%$CCs1)) {
294 my $CC2 = $CCs2->{$filefuncname};
295 if (not defined $CC2) {
297 sub_array_b_from_a($CC2, $CC1); # CC2 -= CC1
298 $CCs2->{$filefuncname} = $CC2;
300 sub_array_b_from_a($CC2, $CC1); # CC2 -= CC1
303 sub_array_b_from_a($summaryCC2, $summaryCC1);
305 #----------------------------------------------------------------------------
306 # Print the result, in CCs2
307 #----------------------------------------------------------------------------
308 print("desc: Files compared: $file1; $file2\n");
309 print("cmd: $cmd1; $cmd2\n");
311 for my $e (@$events1) {
316 while (my ($filefuncname, $CC) = each(%$CCs2)) {
318 my @x = split(/#/, $filefuncname);
319 (scalar @x == 2) || die;
325 foreach my $n (@$CC) {
332 foreach my $n (@$summaryCC2) {
337 ##--------------------------------------------------------------------##
339 ##--------------------------------------------------------------------##