#!/usr/bin/env python2
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# this software without specific prior written permission.
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# 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: Ali Saidi
# Curtis Dunham
#
# This python code is used to migrate checkpoints that were created in one
# version of the simulator to newer version. As features are added or bugs are
# fixed some of the state that needs to be checkpointed can change. If you have
# many historic checkpoints that you use, manually editing them to fix them is
# both time consuming and error-prone.
# This script provides a way to migrate checkpoints to the newer repository in
# a programmatic way. It can be imported into another script or used on the
# command line. From the command line the script will either migrate every
# checkpoint it finds recursively (-r option) or a single checkpoint. When a
# change is made to the gem5 repository that breaks previous checkpoints an
# upgrade() method should be implemented in its own .py file and placed in
# src/util/cpt_upgraders/. For each upgrader whose tag is not present in
# the checkpoint tag list, the upgrade() method will be run, passing in a
# ConfigParser object which contains the open file. As these operations can
# be isa specific the method can verify the isa and use regexes to find the
# correct sections that need to be updated.
# It is also possible to use this mechanism to revert prior tags. In this
# case, implement a downgrade() method instead. Dependencies should still
# work naturally - a tag depending on a tag with a downgrader means that it
# insists on the other tag being removed and its downgrader executed before
# its upgrader (or downgrader) can run. It is still the case that a tag
# can only be used once.
# Dependencies between tags are expressed by two variables at the top-level
# of the upgrader script: "depends" can be either a string naming another
# tag that it depends upon or a list of such strings; and "fwd_depends"
# accepts the same datatypes but it reverses the sense of the dependency
# arrow(s) -- it expresses that that tag depends upon the tag of the current
# upgrader. This can be especially valuable when maintaining private
# upgraders in private branches.
import ConfigParser
import glob, types, sys, os
import os.path as osp
verbose_print = False
def verboseprint(*args):
if not verbose_print:
return
for arg in args:
print arg,
print
class Upgrader:
tag_set = set()
untag_set = set() # tags to remove by downgrading
by_tag = {}
legacy = {}
def __init__(self, filename):
self.filename = filename
execfile(filename, {}, self.__dict__)
if not hasattr(self, 'tag'):
self.tag = osp.basename(filename)[:-3]
if not hasattr(self, 'depends'):
self.depends = []
elif isinstance(self.depends, str):
self.depends = [self.depends]
if not isinstance(self.depends, list):
print "Error: 'depends' for %s is the wrong type" % self.tag
sys.exit(1)
if hasattr(self, 'fwd_depends'):
if isinstance(self.fwd_depends, str):
self.fwd_depends = [self.fwd_depends]
else:
self.fwd_depends = []
if not isinstance(self.fwd_depends, list):
print "Error: 'fwd_depends' for %s is the wrong type" % self.tag
sys.exit(1)
if hasattr(self, 'upgrader'):
if not isinstance(self.upgrader, types.FunctionType):
print "Error: 'upgrader' for %s is %s, not function" \
% (self.tag, type(self))
sys.exit(1)
Upgrader.tag_set.add(self.tag)
elif hasattr(self, 'downgrader'):
if not isinstance(self.downgrader, types.FunctionType):
print "Error: 'downgrader' for %s is %s, not function" \
% (self.tag, type(self))
sys.exit(1)
Upgrader.untag_set.add(self.tag)
else:
print "Error: no upgrader or downgrader method for", self.tag
sys.exit(1)
if hasattr(self, 'legacy_version'):
Upgrader.legacy[self.legacy_version] = self
Upgrader.by_tag[self.tag] = self
def ready(self, tags):
for dep in self.depends:
if dep not in tags:
return False
return True
def update(self, cpt, tags):
if hasattr(self, 'upgrader'):
self.upgrader(cpt)
tags.add(self.tag)
verboseprint("applied upgrade for", self.tag)
else:
self.downgrader(cpt)
tags.remove(self.tag)
verboseprint("applied downgrade for", self.tag)
@staticmethod
def get(tag):
return Upgrader.by_tag[tag]
@staticmethod
def load_all():
util_dir = osp.dirname(osp.abspath(__file__))
for py in glob.glob(util_dir + '/cpt_upgraders/*.py'):
Upgrader(py)
# make linear dependences for legacy versions
i = 3
while i in Upgrader.legacy:
Upgrader.legacy[i].depends = [Upgrader.legacy[i-1].tag]
i = i + 1
# resolve forward dependencies and audit normal dependencies
for tag, upg in Upgrader.by_tag.items():
for fd in upg.fwd_depends:
if fd not in Upgrader.by_tag:
print "Error: '%s' cannot (forward) depend on "\
"nonexistent tag '%s'" % (fd, tag)
sys.exit(1)
Upgrader.by_tag[fd].depends.append(tag)
for dep in upg.depends:
if dep not in Upgrader.by_tag:
print "Error: '%s' cannot depend on "\
"nonexistent tag '%s'" % (tag, dep)
sys.exit(1)
def process_file(path, **kwargs):
if not osp.isfile(path):
import errno
raise IOError(ennro.ENOENT, "No such file", path)
verboseprint("Processing file %s...." % path)
if kwargs.get('backup', True):
import shutil
shutil.copyfile(path, path + '.bak')
cpt = ConfigParser.SafeConfigParser()
# gem5 is case sensitive with paramaters
cpt.optionxform = str
# Read the current data
cpt_file = file(path, 'r')
cpt.readfp(cpt_file)
cpt_file.close()
change = False
# Make sure we know what we're starting from
if cpt.has_option('root','cpt_ver'):
cpt_ver = cpt.getint('root','cpt_ver')
# Legacy linear checkpoint version
# convert to list of tags before proceeding
tags = set([])
for i in xrange(2, cpt_ver+1):
tags.add(Upgrader.legacy[i].tag)
verboseprint("performed legacy version -> tags conversion")
change = True
cpt.remove_option('root', 'cpt_ver')
elif cpt.has_option('Globals','version_tags'):
tags = set((''.join(cpt.get('Globals','version_tags'))).split())
else:
print "fatal: no version information in checkpoint"
exit(1)
verboseprint("has tags", ' '.join(tags))
# If the current checkpoint has a tag we don't know about, we have
# a divergence that (in general) must be addressed by (e.g.) merging
# simulator support for its changes.
unknown_tags = tags - (Upgrader.tag_set | Upgrader.untag_set)
if unknown_tags:
print "warning: upgrade script does not recognize the following "\
"tags in this checkpoint:", ' '.join(unknown_tags)
# Apply migrations for tags not in checkpoint and tags present for which
# downgraders are present, respecting dependences
to_apply = (Upgrader.tag_set - tags) | (Upgrader.untag_set & tags)
while to_apply:
ready = set([ t for t in to_apply if Upgrader.get(t).ready(tags) ])
if not ready:
print "could not apply these upgrades:", ' '.join(to_apply)
print "update dependences impossible to resolve; aborting"
exit(1)
for tag in ready:
Upgrader.get(tag).update(cpt, tags)
change = True
to_apply -= ready
if not change:
verboseprint("...nothing to do")
return
cpt.set('Globals', 'version_tags', ' '.join(tags))
# Write the old data back
verboseprint("...completed")
cpt.write(file(path, 'w'))
if __name__ == '__main__':
from optparse import OptionParser, SUPPRESS_HELP
parser = OptionParser("usage: %prog [options] <filename or directory>")
parser.add_option("-r", "--recurse", action="store_true",
help="Recurse through all subdirectories modifying "\
"each checkpoint that is found")
parser.add_option("-N", "--no-backup", action="store_false",
dest="backup", default=True,
help="Do no backup each checkpoint before modifying it")
parser.add_option("-v", "--verbose", action="store_true",
help="Print out debugging information as")
parser.add_option("--get-cc-file", action="store_true",
# used during build; generate src/sim/tags.cc and exit
help=SUPPRESS_HELP)
(options, args) = parser.parse_args()
verbose_print = options.verbose
Upgrader.load_all()
if options.get_cc_file:
print "// this file is auto-generated by util/cpt_upgrader.py"
print "#include <string>"
print "#include <set>"
print
print "std::set<std::string> version_tags = {"
for tag in Upgrader.tag_set:
print " \"%s\"," % tag
print "};"
exit(0)
elif len(args) != 1:
parser.error("You must specify a checkpoint file to modify or a "\
"directory of checkpoints to recursively update")
# Deal with shell variables and ~
path = osp.expandvars(osp.expanduser(args[0]))
# Process a single file if we have it
if osp.isfile(path):
process_file(path, **vars(options))
# Process an entire directory
elif osp.isdir(path):
cpt_file = osp.join(path, 'm5.cpt')
if options.recurse:
# Visit very file and see if it matches
for root,dirs,files in os.walk(path):
for name in files:
if name == 'm5.cpt':
process_file(osp.join(root,name), **vars(options))
for dir in dirs:
pass
# Maybe someone passed a cpt.XXXXXXX directory and not m5.cpt
elif osp.isfile(cpt_file):
process_file(cpt_file, **vars(options))
else:
print "Error: checkpoint file not found at in %s " % path,
print "and recurse not specified"
sys.exit(1)
sys.exit(0)