#! /usr/bin/env perl
# Copyright (c) 2003-2005 The Regents of The University of Michigan
# All rights reserved.
#
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# modification, are permitted provided that the following conditions are
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# redistributions in binary form must reproduce the above copyright
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# neither the name of the copyright holders nor the names of its
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# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# Authors: Steve Reinhardt

# Script to simplify using rundiff on trace outputs from two
# invocations of m5.
#
# ******Note that you need to enable some trace flags in the args in order
# to do anything useful!******
#
# If you want to pass different arguments to the two instances of m5,
# you can embed them in the simulator arguments like this:
#
# % tracediff "m5.opt --foo.bar=1" "m5.opt --foo.bar=2" [common args]
#

if (@ARGV < 2) {
    die "Usage: tracediff sim1 sim2 [--root.trace.flags=X args...]\n";
}

# First two args are the two simulator binaries to compare
$sim1 = shift;
$sim2 = shift;

# Everything else on the command line is taken to be an m5 argument to
# be given to both invocations
$simargs = '"' . join('" "', @ARGV) . '"';

# Run individual invocations in separate dirs so output and intermediate
# files (particularly config.py and config.ini) don't conflict.
$dir1 = "tracediff-$$-1";
$dir2 = "tracediff-$$-2";
mkdir($dir1) or die "Can't create dir $dir1\n";
mkdir($dir2) or die "Can't create dir $dir2\n";

$cmd1 = "$sim1 $simargs -d $dir1 2>&1 |";
$cmd2 = "$sim2 $simargs -d $dir2 2>&1 |";

# This only works if you have rundiff in your path.  I just edit it
# with an explicit path if necessary.
$fullcmd = "rundiff '$cmd1' '$cmd2' 2>&1 > tracediff-$$.out";

print "Executing $fullcmd\n";
system($fullcmd);