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#! /usr/bin/env python
# Copyright (c) 2020 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# Linker wrapper that performs distributed ThinLTO on Goma.
#
# Usage: Pass the original link command as parameters to this script.
# E.g. original: clang++ -o foo foo.o
# Becomes: goma-ld clang++ -o foo foo.o
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
import goma_link
import os
import re
import sys
class GomaLinkUnix(goma_link.GomaLinkBase):
# Target-platform-specific constants.
WL = '-Wl,'
TLTO = '-plugin-opt=thinlto'
SEP = '='
DATA_SECTIONS = '-fdata-sections'
FUNCTION_SECTIONS = '-ffunction-sections'
GROUP_RE = re.compile(WL + '--(?:end|start)-group')
MACHINE_RE = re.compile('-m([0-9]+)')
OBJ_PATH = '-plugin-opt=obj-path' + SEP
OBJ_SUFFIX = '.o'
PREFIX_REPLACE = TLTO + '-prefix-replace' + SEP
XIR = '-x ir '
WHITELISTED_TARGETS = {
'chrome',
}
def analyze_args(self, args, *posargs, **kwargs):
# TODO(crbug.com/1040196): Builds are unreliable when all targets use
# distributed ThinLTO, so we only enable it for whitelisted targets.
# For other targets, we fall back to local ThinLTO. We must use ThinLTO
# because we build with -fsplit-lto-unit, which requires code generation
# be done for each object and target.
if args.output is None or os.path.basename(
args.output) not in self.WHITELISTED_TARGETS:
# Returning None causes the original, non-distributed linker command to be
# invoked.
return None
return super(GomaLinkUnix, self).analyze_args(args, *posargs, **kwargs)
def process_output_param(self, args, i):
"""
If args[i] is a parameter that specifies the output file,
returns (output_name, new_i). Else, returns (None, new_i).
"""
if args[i] == '-o':
return (os.path.normpath(args[i + 1]), i + 2)
else:
return (None, i + 1)
if __name__ == '__main__':
sys.exit(GomaLinkUnix().main(sys.argv))
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