tests/SConscript - arm/gem5 - Git at Google


            
            # -*- mode:python -*-


            # Copyright (c) 2004-2006 The Regents of The University of Michigan

            
            # All rights reserved.

            
            #

            
            # Redistribution and use in source and binary forms, with or without

            
            # modification, are permitted provided that the following conditions are

            
            # met: redistributions of source code must retain the above copyright

            
            # notice, this list of conditions and the following disclaimer;

            
            # redistributions in binary form must reproduce the above copyright

            
            # notice, this list of conditions and the following disclaimer in the

            
            # documentation and/or other materials provided with the distribution;

            
            # neither the name of the copyright holders nor the names of its

            
            # contributors may be used to endorse or promote products derived from

            
            # 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

            
            # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

            
            # 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

            
            # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

            
            # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

            
            # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

            
            #

            
            # Authors: Steve Reinhardt

            
            #          Kevin Lim


            import os, signal

            
            import sys, time

            
            import glob

            
            from SCons.Script.SConscript import SConsEnvironment


            Import('env')


            env['DIFFOUT'] = File('diff-out')


            # get the termcap from the environment

            
            termcap = env['TERMCAP']


            # Dict that accumulates lists of tests by category (quick, medium, long)

            
            env.Tests = {}


            def contents(node):

            
                return file(str(node)).read()


            # functions to parse return value from scons Execute()... not the same

            
            # as wait() etc., so python built-in os funcs don't work.

            
            def signaled(status):

            
                return (status & 0x80) != 0;


            def signum(status):

            
                return (status & 0x7f);


            # List of signals that indicate that we should retry the test rather

            
            # than consider it failed.

            
            retry_signals = (signal.SIGTERM, signal.SIGKILL, signal.SIGINT,

            
                             signal.SIGQUIT, signal.SIGHUP)


            # regular expressions of lines to ignore when diffing outputs

            
            output_ignore_regexes = (

            
                '^command line:',		# for stdout file

            
                '^gem5 compiled ',		# for stderr file

            
                '^gem5 started ',		# for stderr file

            
                '^gem5 executing on ',	# for stderr file

            
                '^Simulation complete at',	# for stderr file

            
                '^Listening for',		# for stderr file

            
                'listening for remote gdb',	# for stderr file

            
                )


            output_ignore_args = ' '.join(["-I '"+s+"'" for s in output_ignore_regexes])


            output_ignore_args += ' --exclude=stats.txt --exclude=outdiff'


            def run_test(target, source, env):

            
                """Check output from running test.


                Targets are as follows:

            
                target[0] : status


                Sources are:

            
                source[0] : gem5 binary

            
                source[1] : tests/run.py script

            
                source[2] : reference stats file


                """

            
                # make sure target files are all gone

            
                for t in target:

            
                    if os.path.exists(t.abspath):

            
                        env.Execute(Delete(t.abspath))


                tgt_dir = os.path.dirname(str(target[0]))


                # Base command for running test.  We mess around with indirectly

            
                # referring to files via SOURCES and TARGETS so that scons can mess

            
                # with paths all it wants to and we still get the right files.

            
                cmd = '${SOURCES[0]} -d %s -re ${SOURCES[1]} %s' % (tgt_dir, tgt_dir)


                # Prefix test run with batch job submission command if appropriate.

            
                # Batch command also supports timeout arg (in seconds, not minutes).

            
                timeout = 15 * 60 # used to be a param, probably should be again

            
                if env['BATCH']:

            
                    cmd = '%s -t %d %s' % (env['BATCH_CMD'], timeout, cmd)

            
                # The slowest regression (bzip2) requires ~2.8 hours;

            
                # 4 hours was chosen to be conservative.

            
                elif env['TIMEOUT']:

            
                    cmd = 'timeout 4h %s' % cmd


                # Create a default value for the status string, changed as needed

            
                # based on the status.

            
                status_str = "passed."


                pre_exec_time = time.time()

            
                status = env.Execute(env.subst(cmd, target=target, source=source))

            
                if status == 0:

            
                    # gem5 terminated normally.

            
                    # Run diff on output & ref directories to find differences.

            
                    # Exclude the stats file since we will use diff-out on that.


                    # NFS file systems can be annoying and not have updated yet

            
                    # wait until we see the file modified

            
                    statsdiff = os.path.join(tgt_dir, 'statsdiff')

            
                    m_time = 0

            
                    nap = 0

            
                    while m_time < pre_exec_time and nap < 10:

            
                        try:

            
                            m_time = os.stat(statsdiff).st_mtime

            
                        except OSError:

            
                            pass

            
                        time.sleep(1)

            
                        nap += 1


                    outdiff = os.path.join(tgt_dir, 'outdiff')

            
                    # tack 'true' on the end so scons doesn't report diff's

            
                    # non-zero exit code as a build error

            
                    diffcmd = 'diff -ubrs %s ${SOURCES[2].dir} %s > %s; true' \

            
                              % (output_ignore_args, tgt_dir, outdiff)

            
                    env.Execute(env.subst(diffcmd, target=target, source=source))

            
                    print "===== Output differences ====="

            
                    print contents(outdiff)

            
                    # Run diff-out on stats.txt file

            
                    diffcmd = '$DIFFOUT ${SOURCES[2]} %s > %s' \

            
                              % (os.path.join(tgt_dir, 'stats.txt'), statsdiff)

            
                    diffcmd = env.subst(diffcmd, target=target, source=source)

            
                    diff_status = env.Execute(diffcmd, strfunction=None)

            
                    # If there is a difference, change the status string to say so

            
                    if diff_status != 0:

            
                        status_str = "CHANGED!"

            
                    print "===== Statistics differences ====="

            
                    print contents(statsdiff)


                else: # gem5 exit status != 0

            
                    # Consider it a failed test unless the exit status is 2

            
                    status_str = "FAILED!"

            
                    # gem5 did not terminate properly, so no need to check the output

            
                    if env['TIMEOUT'] and status == 124:

            
                        status_str = "TIMED-OUT!"

            
                    elif signaled(status):

            
                        print 'gem5 terminated with signal', signum(status)

            
                        if signum(status) in retry_signals:

            
                            # Consider the test incomplete; don't create a 'status' output.

            
                            # Hand the return status to scons and let scons decide what

            
                            # to do about it (typically terminate unless run with -k).

            
                            return status

            
                    elif status == 2:

            
                        # The test was skipped, change the status string to say so

            
                        status_str = "skipped."

            
                    else:

            
                        print 'gem5 exited with non-zero status', status

            
                    # complete but failed execution (call to exit() with non-zero

            
                    # status, SIGABORT due to assertion failure, etc.)... fall through

            
                    # and generate FAILED status as if output comparison had failed


                # Generate status file contents based on exit status of gem5 and diff-out

            
                f = file(str(target[0]), 'w')

            
                print >>f, tgt_dir, status_str

            
                f.close()

            
                # done

            
                return 0


            def run_test_string(target, source, env):

            
                return env.subst("Running test in ${TARGETS[0].dir}.",

            
                                 target=target, source=source)


            testAction = env.Action(run_test, run_test_string)


            def print_test(target, source, env):

            
                # print the status with colours to make it easier to see what

            
                # passed and what failed

            
                line = contents(source[0])


                # split the line to words and get the last one

            
                words = line.split()

            
                status = words[-1]


                # if the test failed make it red, if it passed make it green, and

            
                # skip the punctuation

            
                if status == "FAILED!" or status == "TIMED-OUT!":

            
                    status = termcap.Red + status[:-1] + termcap.Normal + status[-1]

            
                elif status == "CHANGED!":

            
                    status = termcap.Yellow + status[:-1] + termcap.Normal + status[-1]

            
                elif status == "passed.":

            
                    status = termcap.Green + status[:-1] + termcap.Normal + status[-1]

            
                elif status == "skipped.":

            
                    status = termcap.Cyan + status[:-1] + termcap.Normal + status[-1]


                # put it back in the list and join with space

            
                words[-1] = status

            
                line = " ".join(words)


                print '***** ' + line

            
                return 0


            printAction = env.Action(print_test, strfunction = None)


            # Static vars for update_test:

            
            # - long-winded message about ignored sources

            
            ignore_msg = '''

            
            Note: The following file(s) will not be copied.  New non-standard

            
                  output files must be copied manually once before --update-ref will

            
                  recognize them as outputs.  Otherwise they are assumed to be

            
                  inputs and are ignored.

            
            '''

            
            # - reference files always needed

            
            needed_files = set(['simout', 'simerr', 'stats.txt', 'config.ini'])

            
            # - source files we always want to ignore

            
            known_ignores = set(['status', 'outdiff', 'statsdiff'])


            def update_test(target, source, env):

            
                """Update reference test outputs.


                Target is phony.  First two sources are the ref & new stats.txt file

            
                files, respectively.  We actually copy everything in the

            
                respective directories except the status & diff output files.


                """

            
                dest_dir = str(source[0].get_dir())

            
                src_dir = str(source[1].get_dir())

            
                dest_files = set(os.listdir(dest_dir))

            
                src_files = set(os.listdir(src_dir))

            
                # Copy all of the required files plus any existing dest files.

            
                wanted_files = needed_files | dest_files

            
                missing_files = wanted_files - src_files

            
                if len(missing_files) > 0:

            
                    print "  WARNING: the following file(s) are missing " \

            
                          "and will not be updated:"

            
                    print "    ", " ,".join(missing_files)

            
                copy_files = wanted_files - missing_files

            
                warn_ignored_files = (src_files - copy_files) - known_ignores

            
                if len(warn_ignored_files) > 0:

            
                    print ignore_msg,

            
                    print "       ", ", ".join(warn_ignored_files)

            
                for f in copy_files:

            
                    if f in dest_files:

            
                        print "  Replacing file", f

            
                        dest_files.remove(f)

            
                    else:

            
                        print "  Creating new file", f

            
                    copyAction = Copy(os.path.join(dest_dir, f), os.path.join(src_dir, f))

            
                    copyAction.strfunction = None

            
                    env.Execute(copyAction)

            
                return 0


            def update_test_string(target, source, env):

            
                return env.subst("Updating ${SOURCES[0].dir} from ${SOURCES[1].dir}",

            
                                 target=target, source=source)


            updateAction = env.Action(update_test, update_test_string)


            def test_builder(env, ref_dir):

            
                """Define a test."""


                path = list(ref_dir.split('/'))


                # target path (where test output goes) consists of category, mode,

            
                # name, isa, opsys, and config (skips the 'ref' component)

            
                assert(path.pop(-4) == 'ref')

            
                tgt_dir = os.path.join(*path[-6:])


                # local closure for prepending target path to filename

            
                def tgt(f):

            
                    return os.path.join(tgt_dir, f)


                ref_stats = os.path.join(ref_dir, 'stats.txt')

            
                new_stats = tgt('stats.txt')

            
                status_file = tgt('status')


                env.Command([status_file, new_stats],

            
                            [env.M5Binary, 'run.py', ref_stats],

            
                            testAction)


                # phony target to echo status

            
                if GetOption('update_ref'):

            
                    p = env.Command(tgt('_update'),

            
                                    [ref_stats, new_stats, status_file],

            
                                    updateAction)

            
                else:

            
                    p = env.Command(tgt('_print'), [status_file], printAction)


                env.AlwaysBuild(p)


            # Figure out applicable configs based on build type

            
            configs = []

            
            if env['TARGET_ISA'] == 'alpha':

            
                configs += ['tsunami-simple-atomic',

            
                            'tsunami-simple-timing',

            
                            'tsunami-simple-atomic-dual',

            
                            'tsunami-simple-timing-dual',

            
                            'twosys-tsunami-simple-atomic',

            
                            'tsunami-o3', 'tsunami-o3-dual',

            
                            'tsunami-minor', 'tsunami-minor-dual',

            
                            'tsunami-switcheroo-full']

            
            if env['TARGET_ISA'] == 'sparc':

            
                configs += ['t1000-simple-atomic',

            
                            't1000-simple-timing']

            
            if env['TARGET_ISA'] == 'arm':

            
                configs += ['simple-atomic-dummychecker',

            
                            'o3-timing-checker',

            
                            'realview-simple-atomic',

            
                            'realview-simple-atomic-dual',

            
                            'realview-simple-timing',

            
                            'realview-simple-timing-dual',

            
                            'realview-o3',

            
                            'realview-o3-checker',

            
                            'realview-o3-dual',

            
                            'realview-minor',

            
                            'realview-minor-dual',

            
                            'realview-switcheroo-atomic',

            
                            'realview-switcheroo-timing',

            
                            'realview-switcheroo-o3',

            
                            'realview-switcheroo-full',

            
                            'realview64-simple-atomic',

            
                            'realview64-simple-atomic-dual',

            
                            'realview64-simple-timing',

            
                            'realview64-simple-timing-dual',

            
                            'realview64-o3',

            
                            'realview64-o3-checker',

            
                            'realview64-o3-dual',

            
                            'realview64-minor',

            
                            'realview64-minor-dual',

            
                            'realview64-switcheroo-atomic',

            
                            'realview64-switcheroo-timing',

            
                            'realview64-switcheroo-o3',

            
                            'realview64-switcheroo-full']

            
            if env['TARGET_ISA'] == 'x86':

            
                configs += ['pc-simple-atomic',

            
                            'pc-simple-timing',

            
                            'pc-o3-timing',

            
                            'pc-switcheroo-full']


            configs += ['simple-atomic', 'simple-atomic-mp',

            
                        'simple-timing', 'simple-timing-mp',

            
                        'minor-timing', 'minor-timing-mp',

            
                        'o3-timing', 'o3-timing-mp',

            
                        'rubytest', 'memtest', 'memtest-filter',

            
                        'tgen-simple-mem', 'tgen-dram-ctrl']


            if env['PROTOCOL'] != 'None':

            
                if env['PROTOCOL'] == 'MI_example':

            
                    configs += [c + "-ruby" for c in configs]

            
                else:

            
                    configs = [c + "-ruby-" + env['PROTOCOL'] for c in configs]


            src = Dir('.').srcdir

            
            for config in configs:

            
                dirs = src.glob('*/*/*/ref/%s/*/%s' % (env['TARGET_ISA'], config))

            
                for d in dirs:

            
                    d = str(d)

            
                    if not os.path.exists(os.path.join(d, 'skip')):

            
                        test_builder(env, d)
	# -- mode:python --

	# Copyright (c) 2004-2006 The Regents of The University of Michigan
	# All rights reserved.
	#
	# Redistribution and use in source and binary forms, with or without
	# modification, are permitted provided that the following conditions are
	# met: redistributions of source code must retain the above copyright
	# notice, this list of conditions and the following disclaimer;
	# redistributions in binary form must reproduce the above copyright
	# notice, this list of conditions and the following disclaimer in the
	# documentation and/or other materials provided with the distribution;
	# neither the name of the copyright holders nor the names of its
	# contributors may be used to endorse or promote products derived from
	# 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
	# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	# 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
	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	#
	# Authors: Steve Reinhardt
	# Kevin Lim

	import os, signal
	import sys, time
	import glob
	from SCons.Script.SConscript import SConsEnvironment

	Import('env')

	env['DIFFOUT'] = File('diff-out')

	# get the termcap from the environment
	termcap = env['TERMCAP']

	# Dict that accumulates lists of tests by category (quick, medium, long)
	env.Tests = {}

	def contents(node):
	return file(str(node)).read()

	# functions to parse return value from scons Execute()... not the same
	# as wait() etc., so python built-in os funcs don't work.
	def signaled(status):
	return (status & 0x80) != 0;

	def signum(status):
	return (status & 0x7f);

	# List of signals that indicate that we should retry the test rather
	# than consider it failed.
	retry_signals = (signal.SIGTERM, signal.SIGKILL, signal.SIGINT,
	signal.SIGQUIT, signal.SIGHUP)

	# regular expressions of lines to ignore when diffing outputs
	output_ignore_regexes = (
	'^command line:', # for stdout file
	'^gem5 compiled ', # for stderr file
	'^gem5 started ', # for stderr file
	'^gem5 executing on ', # for stderr file
	'^Simulation complete at', # for stderr file
	'^Listening for', # for stderr file
	'listening for remote gdb', # for stderr file
	)

	output_ignore_args = ' '.join(["-I '"+s+"'" for s in output_ignore_regexes])

	output_ignore_args += ' --exclude=stats.txt --exclude=outdiff'

	def run_test(target, source, env):
	"""Check output from running test.

	Targets are as follows:
	target[0] : status

	Sources are:
	source[0] : gem5 binary
	source[1] : tests/run.py script
	source[2] : reference stats file

	"""
	# make sure target files are all gone
	for t in target:
	if os.path.exists(t.abspath):
	env.Execute(Delete(t.abspath))

	tgt_dir = os.path.dirname(str(target[0]))

	# Base command for running test. We mess around with indirectly
	# referring to files via SOURCES and TARGETS so that scons can mess
	# with paths all it wants to and we still get the right files.
	cmd = '${SOURCES[0]} -d %s -re ${SOURCES[1]} %s' % (tgt_dir, tgt_dir)

	# Prefix test run with batch job submission command if appropriate.
	# Batch command also supports timeout arg (in seconds, not minutes).
	timeout = 15 * 60 # used to be a param, probably should be again
	if env['BATCH']:
	cmd = '%s -t %d %s' % (env['BATCH_CMD'], timeout, cmd)
	# The slowest regression (bzip2) requires ~2.8 hours;
	# 4 hours was chosen to be conservative.
	elif env['TIMEOUT']:
	cmd = 'timeout 4h %s' % cmd

	# Create a default value for the status string, changed as needed
	# based on the status.
	status_str = "passed."

	pre_exec_time = time.time()
	status = env.Execute(env.subst(cmd, target=target, source=source))
	if status == 0:
	# gem5 terminated normally.
	# Run diff on output & ref directories to find differences.
	# Exclude the stats file since we will use diff-out on that.

	# NFS file systems can be annoying and not have updated yet
	# wait until we see the file modified
	statsdiff = os.path.join(tgt_dir, 'statsdiff')
	m_time = 0
	nap = 0
	while m_time < pre_exec_time and nap < 10:
	try:
	m_time = os.stat(statsdiff).st_mtime
	except OSError:
	pass
	time.sleep(1)
	nap += 1

	outdiff = os.path.join(tgt_dir, 'outdiff')
	# tack 'true' on the end so scons doesn't report diff's
	# non-zero exit code as a build error
	diffcmd = 'diff -ubrs %s ${SOURCES[2].dir} %s > %s; true' \
	% (output_ignore_args, tgt_dir, outdiff)
	env.Execute(env.subst(diffcmd, target=target, source=source))
	print "===== Output differences ====="
	print contents(outdiff)
	# Run diff-out on stats.txt file
	diffcmd = '$DIFFOUT ${SOURCES[2]} %s > %s' \
	% (os.path.join(tgt_dir, 'stats.txt'), statsdiff)
	diffcmd = env.subst(diffcmd, target=target, source=source)
	diff_status = env.Execute(diffcmd, strfunction=None)
	# If there is a difference, change the status string to say so
	if diff_status != 0:
	status_str = "CHANGED!"
	print "===== Statistics differences ====="
	print contents(statsdiff)

	else: # gem5 exit status != 0
	# Consider it a failed test unless the exit status is 2
	status_str = "FAILED!"
	# gem5 did not terminate properly, so no need to check the output
	if env['TIMEOUT'] and status == 124:
	status_str = "TIMED-OUT!"
	elif signaled(status):
	print 'gem5 terminated with signal', signum(status)
	if signum(status) in retry_signals:
	# Consider the test incomplete; don't create a 'status' output.
	# Hand the return status to scons and let scons decide what
	# to do about it (typically terminate unless run with -k).
	return status
	elif status == 2:
	# The test was skipped, change the status string to say so
	status_str = "skipped."
	else:
	print 'gem5 exited with non-zero status', status
	# complete but failed execution (call to exit() with non-zero
	# status, SIGABORT due to assertion failure, etc.)... fall through
	# and generate FAILED status as if output comparison had failed

	# Generate status file contents based on exit status of gem5 and diff-out
	f = file(str(target[0]), 'w')
	print >>f, tgt_dir, status_str
	f.close()
	# done
	return 0

	def run_test_string(target, source, env):
	return env.subst("Running test in ${TARGETS[0].dir}.",
	target=target, source=source)

	testAction = env.Action(run_test, run_test_string)

	def print_test(target, source, env):
	# print the status with colours to make it easier to see what
	# passed and what failed
	line = contents(source[0])

	# split the line to words and get the last one
	words = line.split()
	status = words[-1]

	# if the test failed make it red, if it passed make it green, and
	# skip the punctuation
	if status == "FAILED!" or status == "TIMED-OUT!":
	status = termcap.Red + status[:-1] + termcap.Normal + status[-1]
	elif status == "CHANGED!":
	status = termcap.Yellow + status[:-1] + termcap.Normal + status[-1]
	elif status == "passed.":
	status = termcap.Green + status[:-1] + termcap.Normal + status[-1]
	elif status == "skipped.":
	status = termcap.Cyan + status[:-1] + termcap.Normal + status[-1]

	# put it back in the list and join with space
	words[-1] = status
	line = " ".join(words)

	print '***** ' + line
	return 0

	printAction = env.Action(print_test, strfunction = None)

	# Static vars for update_test:
	# - long-winded message about ignored sources
	ignore_msg = '''
	Note: The following file(s) will not be copied. New non-standard
	output files must be copied manually once before --update-ref will
	recognize them as outputs. Otherwise they are assumed to be
	inputs and are ignored.
	'''
	# - reference files always needed
	needed_files = set(['simout', 'simerr', 'stats.txt', 'config.ini'])
	# - source files we always want to ignore
	known_ignores = set(['status', 'outdiff', 'statsdiff'])

	def update_test(target, source, env):
	"""Update reference test outputs.

	Target is phony. First two sources are the ref & new stats.txt file
	files, respectively. We actually copy everything in the
	respective directories except the status & diff output files.

	"""
	dest_dir = str(source[0].get_dir())
	src_dir = str(source[1].get_dir())
	dest_files = set(os.listdir(dest_dir))
	src_files = set(os.listdir(src_dir))
	# Copy all of the required files plus any existing dest files.
	wanted_files = needed_files \| dest_files
	missing_files = wanted_files - src_files
	if len(missing_files) > 0:
	print " WARNING: the following file(s) are missing " \
	"and will not be updated:"
	print " ", " ,".join(missing_files)
	copy_files = wanted_files - missing_files
	warn_ignored_files = (src_files - copy_files) - known_ignores
	if len(warn_ignored_files) > 0:
	print ignore_msg,
	print " ", ", ".join(warn_ignored_files)
	for f in copy_files:
	if f in dest_files:
	print " Replacing file", f
	dest_files.remove(f)
	else:
	print " Creating new file", f
	copyAction = Copy(os.path.join(dest_dir, f), os.path.join(src_dir, f))
	copyAction.strfunction = None
	env.Execute(copyAction)
	return 0

	def update_test_string(target, source, env):
	return env.subst("Updating ${SOURCES[0].dir} from ${SOURCES[1].dir}",
	target=target, source=source)

	updateAction = env.Action(update_test, update_test_string)

	def test_builder(env, ref_dir):
	"""Define a test."""

	path = list(ref_dir.split('/'))

	# target path (where test output goes) consists of category, mode,
	# name, isa, opsys, and config (skips the 'ref' component)
	assert(path.pop(-4) == 'ref')
	tgt_dir = os.path.join(*path[-6:])

	# local closure for prepending target path to filename
	def tgt(f):
	return os.path.join(tgt_dir, f)

	ref_stats = os.path.join(ref_dir, 'stats.txt')
	new_stats = tgt('stats.txt')
	status_file = tgt('status')

	env.Command([status_file, new_stats],
	[env.M5Binary, 'run.py', ref_stats],
	testAction)

	# phony target to echo status
	if GetOption('update_ref'):
	p = env.Command(tgt('_update'),
	[ref_stats, new_stats, status_file],
	updateAction)
	else:
	p = env.Command(tgt('_print'), [status_file], printAction)

	env.AlwaysBuild(p)


	# Figure out applicable configs based on build type
	configs = []
	if env['TARGET_ISA'] == 'alpha':
	configs += ['tsunami-simple-atomic',
	'tsunami-simple-timing',
	'tsunami-simple-atomic-dual',
	'tsunami-simple-timing-dual',
	'twosys-tsunami-simple-atomic',
	'tsunami-o3', 'tsunami-o3-dual',
	'tsunami-minor', 'tsunami-minor-dual',
	'tsunami-switcheroo-full']
	if env['TARGET_ISA'] == 'sparc':
	configs += ['t1000-simple-atomic',
	't1000-simple-timing']
	if env['TARGET_ISA'] == 'arm':
	configs += ['simple-atomic-dummychecker',
	'o3-timing-checker',
	'realview-simple-atomic',
	'realview-simple-atomic-dual',
	'realview-simple-timing',
	'realview-simple-timing-dual',
	'realview-o3',
	'realview-o3-checker',
	'realview-o3-dual',
	'realview-minor',
	'realview-minor-dual',
	'realview-switcheroo-atomic',
	'realview-switcheroo-timing',
	'realview-switcheroo-o3',
	'realview-switcheroo-full',
	'realview64-simple-atomic',
	'realview64-simple-atomic-dual',
	'realview64-simple-timing',
	'realview64-simple-timing-dual',
	'realview64-o3',
	'realview64-o3-checker',
	'realview64-o3-dual',
	'realview64-minor',
	'realview64-minor-dual',
	'realview64-switcheroo-atomic',
	'realview64-switcheroo-timing',
	'realview64-switcheroo-o3',
	'realview64-switcheroo-full']
	if env['TARGET_ISA'] == 'x86':
	configs += ['pc-simple-atomic',
	'pc-simple-timing',
	'pc-o3-timing',
	'pc-switcheroo-full']

	configs += ['simple-atomic', 'simple-atomic-mp',
	'simple-timing', 'simple-timing-mp',
	'minor-timing', 'minor-timing-mp',
	'o3-timing', 'o3-timing-mp',
	'rubytest', 'memtest', 'memtest-filter',
	'tgen-simple-mem', 'tgen-dram-ctrl']

	if env['PROTOCOL'] != 'None':
	if env['PROTOCOL'] == 'MI_example':
	configs += [c + "-ruby" for c in configs]
	else:
	configs = [c + "-ruby-" + env['PROTOCOL'] for c in configs]

	src = Dir('.').srcdir
	for config in configs:
	dirs = src.glob('///ref/%s//%s' % (env['TARGET_ISA'], config))
	for d in dirs:
	d = str(d)
	if not os.path.exists(os.path.join(d, 'skip')):
	test_builder(env, d)