#!/usr/bin/perl

# Three-way DejaGNU comparison; uses dglib.pm.  Run perldoc on this file for
# usage.
#
# Author: Matthew Sachs <msachs@apple.com>
#
# Copyright (C) 2006-2023 Free Software Foundation, Inc.
#
# This file is part of GCC.
#
# GCC 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 3, or (at your option)
# any later version.
#
# GCC 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 GCC; see the file COPYING.  If not, write to
# the Free Software Foundation, 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301, USA.

=pod

=head1 SYNOPSIS

compareSumTests3 -- Two-way or three-way compare between DejaGNU .sum files

=head1 USAGE

	compareSumTests3 old1.sum [old2.sum] new.sum
	compareSumTests3 -i 1:2 -x 2:3 old1.sum old2.sum new.sum

=head1 DESCRIPTION

Gives results in terms of 'new' (e.g. things that work in 'new' and don't in
other compilers are improvements, things that don't in 'new' and do in others
are regressions, and it tells you which of the two old compilers (or both)
the test is a regression from.

We treat any DG result other than PASS or XFAIL as a failure, e.g.
UNRESOLVED, UNTESTED or test was not run.

We merge some tests into 'logical tests' with multiple subphases.
For instance, some tests will have compile, execute, and link
subtests.  For these tests, if one of the phases fails, we
indicate which phase the failure originates in.  For instance,
in the following test results:

	gcc.c-torture/compile_execute/xxxx.c: [FAIL:C,FAIL:X,PASS]

the "compile_execute" replaces the compile or execute portion of the test name,
and "FAIL:C" and "FAIL:X" indicates where the combined test failed.

=head1 OPTIONS

=head2 OVERVIEW

=over 4

=item *

C<-i X:Y>: Only display differences between the two indicated runs.

=item *

C<-p>: Give plain output, suitable for piping to another program.

=item *

C<-x X:Y>: Exclude differences between the two indicated runs.

=back

=head2 PLAIN OUTPUT FORMAT

In the plain
output format, the category headers are not displayed and there are no tabs
in front of each result line.  Instead, each result line has two characters
followed by a space in front of it.  The first character will be either an 'I'
for improvement or 'R' for regression; the second character will be a 1, 2, or 3,
indicating which run was the odd one out.

=head2 SELECTING CHANGE SUBSETS

The following options cause only a selected subset of changes to be displayed.
These options ask for a "run", a number which is used to select
one of the three runs (C<old1>, C<old2>, or C<new>.)  C<1> and C<2> signify C<old1> and C<old2>
respectively; 3 signifies C<new>. If multiple options are given, the changes displayed
will be those which obey all of the given restrictions.

Typical usage of these options is to express something like "give me all changes
between 2 and 3, except for those where there was the same difference betwen 1 and 2
(as between 2 and 3.)"  This would be given as:

	-i 2:3 -x 1:2

=over 4

=item *

C<-i X:Y>: Only differences which are present between the two runs given
are displayed. For instance, if C<-i 1:2> is given and test A passes in
runs 1 and 2 but fails in run 3, that result will not be displayed.

=item *

C<-x X:Y>: Differences which are identical to a difference between the two runs
given will B<not> be displayed. For instance, if C<-x 1:2> is given and
test A passes in run 1 and fails in runs 2 and 3, that result will not be
displayed (since C<-x> will cause the difference between 1 and 2 to be ignored,
and the difference in 1 and 3 parallels the difference between 1 and 2.)
This option may only be used in conjunction with C<-i>.

=back

=cut

use strict;
use warnings;
use Getopt::Long;

use FindBin qw($Bin);
use lib "$Bin";
use dglib;

my %options;
my $error = undef;

if(!GetOptions(
	"p" => \$options{p},
	"i=s" => \$options{i},
	"x=s" => \$options{x},
)) {
	$error = "";
} elsif(@ARGV != 2 and @ARGV != 3) {
	$error = "";
} elsif($options{x} and !$options{i}) {
	$error = "-x may only be given in conjunction with -i.";
} else {
	foreach my $opt("i", "x") {
		if($options{$opt} and
		  ($options{$opt} !~ /^([123]):([123])$/ or
		   $1 == $2)
		) {
			$error = "Invalid -$opt argument.";
		}
	}
}

if(defined($error)) {
	print STDERR "$error\n" if $error;
	print STDERR "Usage: compareSumTests3 [-p] [-i X:Y [-x X:Y]] old1.sum old2.sum new.sum\n";
	print STDERR "Try 'perldoc $0' for further information.\n";
	exit 1;
} 

my(@sumfiles) = @ARGV;
-f $_ || die "$_ is not a regular file!\n" foreach @sumfiles;
my(%results, @inc_changes, @exc_changes, %checksums);

# We decrement the values given so that they correspond
# to indices into our results array.
if($options{i}) {
	$options{i} =~ /(\d+):(\d+)/;
	@inc_changes = ($1 - 1, $2 - 1);
}
if($options{x}) {
	$options{x} =~ /(\d+):(\d+)/;
	@exc_changes = ($1 - 1, $2 - 1);
}


my %analyzed_results = compareSumFiles(\@sumfiles);

foreach my $cat (qw(improvements regressions miscellaneous)) {
	if(@sumfiles == 3) {
		my @subcounts;
		if(!$options{p}) {
			$subcounts[$_] = @{$analyzed_results{$cat}->[$_] || []} for(0..2);
			print "\u$cat: ", ($subcounts[0]+$subcounts[1]+$subcounts[2]), "\n";
		}

		for(my $i = 0; $i < 3; $i++) {
			if(!$options{p} and $cat ne "miscellaneous") {
				if($i == 0) {
					if($cat eq "regressions") {
						print "\tSuccess in old1 only: $subcounts[$i]\n";
					} else {
						print "\tFailure in old1 only: $subcounts[$i]\n";
					}
				} elsif($i == 1) {
					if($cat eq "regressions") {
						print "\tSuccess in old2 only: $subcounts[$i]\n";
					} else {
						print "\tFailure in old2 only: $subcounts[$i]\n";
					}
				} else {
					if($cat eq "regressions") {
						print "\tFailure in new only: $subcounts[$i]\n";
					} else {
						print "\tSuccess in new only: $subcounts[$i]\n";
					}
				}
			}

			foreach my $test (sort {$a->{name} cmp $b->{name}} @{$analyzed_results{$cat}->[$i] || []}) {
				if(!$options{p}) {
					if($cat eq "miscellaneous") {
						print "\t";
					} else {
						print "\t\t";
					}
				} else {
					if($cat eq "regressions") {
						print "R";
					} else {
						print "I";
					}

					print $i+1, " ";
				}
				printf "%s [%s,%s,%s]\n", $test->{name}, $test->{data}->[0], $test->{data}->[1], $test->{data}->[2];
			}
		}
	} else {
		if(!$options{p}) {
			my $subcount = @{$analyzed_results{$cat}};
			print "\u$cat: $subcount\n";
		}

		foreach my $test (sort {$a->{name} cmp $b->{name}} @{$analyzed_results{$cat}}) {
			if(!$options{p}) {
				print "\t";
			} else {
				if($cat eq "regressions") {
					print "R";				} else {
					print "I";
				}

				print "  ";
			}
			printf "%s [%s,%s]\n", $test->{name}, $test->{data}->[0], $test->{data}->[1], $test->{data}->[2];
		}
	}
}