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#!/usr/bin/env python2
# -*- coding: utf-8 -*-
# Copyright 2019 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Download profdata from different arches, merge them and upload to gs."""
from __future__ import print_function
import argparse
import collections
import distutils.spawn
import json
import os
import os.path
import shutil
import subprocess
import sys
import tempfile
_LLVM_PROFDATA = '/usr/bin/llvm-profdata'
_GS_PREFIX = 'gs://'
_LLVMMetadata = collections.namedtuple('_LLVMMetadata', ['head_sha'])
def _get_gs_latest(remote_lastest):
assert remote_lastest.startswith(_GS_PREFIX)
try:
return subprocess.check_output(['gsutil', 'cat', remote_lastest])
except subprocess.CalledProcessError:
raise RuntimeError('Lastest artifacts not found: %s' % remote_lastest)
def _fetch_gs_artifact(remote_name, local_name):
assert remote_name.startswith(_GS_PREFIX)
print('Fetching %r to %r' % (remote_name, local_name))
subprocess.check_call(['gsutil', 'cp', remote_name, local_name])
def _find_latest_artifacts(arch):
remote_latest = (
'%schromeos-image-archive/'
'%s-pgo-generate-llvm-next-toolchain/LATEST-master' % (_GS_PREFIX, arch))
version = _get_gs_latest(remote_latest)
return '%s-pgo-generate-llvm-next-toolchain/%s' % (arch, version)
def _get_gs_profdata(remote_base, base_dir):
remote_profdata_basename = 'llvm_profdata.tar.xz'
remote_profdata = os.path.join(remote_base, remote_profdata_basename)
tar = 'llvm_profdata.tar.xz'
_fetch_gs_artifact(remote_profdata, tar)
extract_cmd = ['tar', '-xf', tar]
print('Extracting profdata tarball.\nCMD: %s\n' % extract_cmd)
subprocess.check_call(extract_cmd)
# Return directory to the llvm.profdata extracted.
return os.path.join('b/s/w/ir/cache/cbuild/repository/buildbot_archive/',
base_dir, 'llvm.profdata')
def _get_gs_metadata(remote_base):
metadata_basename = 'llvm_metadata.json'
_fetch_gs_artifact(
os.path.join(remote_base, metadata_basename), metadata_basename)
with open(metadata_basename) as f:
result = json.load(f)
return _LLVMMetadata(head_sha=result['head_sha'])
def _get_gs_artifacts(base_dir):
remote_base = '%schromeos-image-archive/%s' % (_GS_PREFIX, base_dir)
profile_path = _get_gs_profdata(remote_base, base_dir)
metadata = _get_gs_metadata(remote_base)
return metadata, profile_path
def _merge_profdata(profdata_list, output_name):
merge_cmd = [_LLVM_PROFDATA, 'merge', '-output', output_name] + profdata_list
print('Merging PGO profiles.\nCMD: %s\n' % merge_cmd)
subprocess.check_call(merge_cmd)
def _tar_and_upload_profdata(profdata, name_suffix):
tarball = 'llvm-profdata-%s.tar.xz' % name_suffix
print('Making profdata tarball: %s' % tarball)
subprocess.check_call(
['tar', '--sparse', '-I', 'xz', '-cf', tarball, profdata])
upload_location = '%schromeos-localmirror/distfiles/%s' % (_GS_PREFIX,
tarball)
# TODO: it's better to create a subdir: distfiles/llvm_pgo_profile, but
# now llvm could only recognize distfiles.
upload_cmd = [
'gsutil',
'-m',
'cp',
'-n',
'-a',
'public-read',
tarball,
upload_location,
]
print('Uploading tarball to gs.\nCMD: %s\n' % upload_cmd)
# gsutil prints all status to stderr, oddly enough.
gs_output = subprocess.check_output(upload_cmd, stderr=subprocess.STDOUT)
print(gs_output)
# gsutil exits successfully even if it uploaded nothing. It prints a summary
# of what all it did, though. Successful uploads are just a progress bar,
# unsuccessful ones note that items were skipped.
if 'Skipping existing item' in gs_output:
raise ValueError('Profile upload failed: would overwrite an existing '
'profile at %s' % upload_location)
def main():
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument(
'-l',
'--latest',
default=[],
action='append',
help='User can specify the profdata from which architectures to '
'download. By default, we merge profdata from arm, arm64, amd64.')
parser.add_argument(
'-t',
'--tryjob',
default=[],
action='append',
help='Extra pgo-generate-llvm-next-toolchain/tryjob results to be used. '
'Format should be '
'{arch}-pgo-generate-llvm-next-toolchain(-tryjob)/{VERSION}.')
parser.add_argument(
'-o',
'--output',
default='llvm.profdata',
help='Where to put merged PGO profile. The default is to not save it '
'anywhere.')
parser.add_argument(
'--llvm_hash',
help='The LLVM hash to select for the profiles. Generally autodetected.')
args = parser.parse_args()
# If no --latest specified, by default we collect from listed arches.
latest = ['arm', 'arm64', 'amd64'] if not args.latest else args.latest
if not distutils.spawn.find_executable(_LLVM_PROFDATA):
sys.exit(_LLVM_PROFDATA + ' not found; are you in the chroot?')
initial_dir = os.getcwd()
temp_dir = tempfile.mkdtemp(prefix='merge_pgo')
success = True
try:
os.chdir(temp_dir)
profdata_list = []
heads = set()
def fetch_and_append_artifacts(gs_url):
llvm_metadata, profdata_loc = _get_gs_artifacts(gs_url)
if os.path.getsize(profdata_loc) < 512 * 1024:
raise RuntimeError('The PGO profile in %s (local path: %s) is '
'suspiciously small. Something might have gone '
'wrong.' % (gs_url, profdata_loc))
heads.add(llvm_metadata.head_sha)
profdata_list.append(profdata_loc)
for arch in latest:
fetch_and_append_artifacts(_find_latest_artifacts(arch))
if args.tryjob:
for tryjob in args.tryjob:
fetch_and_append_artifacts(tryjob)
assert heads, 'Didn\'t fetch anything?'
def die_with_head_complaint(complaint):
extra = ' (HEADs found: %s)' % sorted(heads)
raise RuntimeError(complaint.rstrip() + extra)
llvm_hash = args.llvm_hash
if not llvm_hash:
if len(heads) != 1:
die_with_head_complaint(
'%d LLVM HEADs were found, which is more than one. You probably '
'want a consistent set of HEADs for a profile. If you know you '
'don\'t, please specify --llvm_hash, and note that *all* profiles '
'will be merged into this final profile, regardless of their '
'reported HEAD.' % len(heads))
llvm_hash, = heads
if llvm_hash not in heads:
assert llvm_hash == args.llvm_hash
die_with_head_complaint(
'HEAD %s wasn\'t found in any fetched artifacts.' % llvm_hash)
print('Using LLVM hash: %s' % llvm_hash)
_merge_profdata(profdata_list, args.output)
print('Merged profdata locates at %s\n' % os.path.abspath(args.output))
_tar_and_upload_profdata(args.output, name_suffix=llvm_hash)
print('Merged profdata uploaded successfully.')
except:
success = False
raise
finally:
os.chdir(initial_dir)
if success:
print('Clearing temp directory.')
shutil.rmtree(temp_dir, ignore_errors=True)
else:
print('Script fails, temp directory is at: %s' % temp_dir)
if __name__ == '__main__':
sys.exit(main())
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