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# Copyright 2023 the V8 project authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Calculate arguments for the gcmole plugin based on flags passed to the
compiler for a typical target in V8.
"""
from pathlib import Path
import os
import re
import sys
DEFINES_RE = re.compile(r'^defines = (.*)$', re.M)
INCLUDES_RE = re.compile(r'^include_dirs = (.*)$', re.M)
CFLAGS_CC_RE = re.compile(r'^cflags_cc = (.*)$', re.M)
BASE_DIR = Path(__file__).resolve().parents[2].absolute()
# This script is always called relative to the build directory root
# by ninja.
BUILD_DIR_ABS = Path.cwd()
BUILD_DIR_REL = BUILD_DIR_ABS.relative_to(BASE_DIR)
def search_flags(regexp, ninja_config):
match = regexp.search(ninja_config)
assert match
result = match.group(1)
assert result
return result
def main():
assert len(sys.argv) == 2, 'Expecting sysroot arg'
gn_sysroot_var = sys.argv[1]
assert gn_sysroot_var.startswith('//'), 'Expecting root-dir gn path'
rel_sysroot = gn_sysroot_var[len('//'):]
assert BUILD_DIR_ABS.exists()
ninja_file = BUILD_DIR_ABS / 'obj' / 'v8_base_without_compiler.ninja'
assert ninja_file.exists()
with ninja_file.open() as f:
ninja_config = f.read()
defines = search_flags(DEFINES_RE, ninja_config)
# ninja files escape special characters (e.g. '"', '\', '(', etc).
defines = defines.replace('\\', '')
includes = search_flags(INCLUDES_RE, ninja_config)
cflags_cc = search_flags(CFLAGS_CC_RE, ninja_config)
flags = []
flags += defines.strip().split()
# Include flags are relative to the build root. Make them relative to the
# base directory for gcmole.
# E.g. BUILD_DIR_REL = out/build and -I../../include gives -Iinclude.
for flag in includes.strip().split():
prefix, suffix = flag[:2], flag[2:]
assert prefix == '-I'
flags.append(prefix + os.path.normpath(BUILD_DIR_REL / suffix))
# System include flags are in the ccflags
for flag in cflags_cc.strip().split():
if flag == "-nostdinc++":
flags.append(flag)
elif flag.startswith('-isystem'):
prefix, suffix = flag[:len('-isystem')], flag[len('-isystem'):]
assert prefix == '-isystem'
flags.append(prefix + os.path.normpath(BUILD_DIR_REL / suffix))
flags.append(f'--sysroot={rel_sysroot}')
with open('v8_gcmole.args', 'w') as f:
f.write(' '.join(flags))
if __name__ == '__main__':
main()
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