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#!/usr/bin/env python3
# Copyright 2021 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.
import argparse
import os
import sys
if (sys.version_info >= (3, 0)):
from io import StringIO
else:
from io import BytesIO as StringIO
def parse_args():
global args
parser = argparse.ArgumentParser()
parser.add_argument('-o', '--output', type=str, action='store',
help='Location of header file to generate')
parser.add_argument('-p', '--positive-define', type=str, action='append',
help='Externally visibile positive definition')
parser.add_argument('-n', '--negative-define', type=str, action='append',
help='Externally visibile negative definition')
args = parser.parse_args()
def generate_positive_definition(out, define):
out.write('''
#ifndef {define}
#define {define} 1
#else
#if {define} != 1
#error "{define} defined but not set to 1"
#endif
#endif // {define}
'''.format(define=define))
def generate_negative_definition(out, define):
out.write('''
#ifdef {define}
#error "{define} is defined but is disabled by V8's GN build arguments"
#endif // {define}
'''.format(define=define))
def generate_header(out):
out.write('''// AUTOMATICALLY GENERATED. DO NOT EDIT.
// The following definitions were used when V8 itself was built, but also appear
// in the externally-visible header files and so must be included by any
// embedder. This will be done automatically if V8_GN_HEADER is defined.
// Ready-compiled distributions of V8 will need to provide this generated header
// along with the other headers in include.
// This header must be stand-alone because it is used across targets without
// introducing dependencies. It should only be included via v8config.h.
''')
if args.positive_define:
for define in args.positive_define:
generate_positive_definition(out, define)
if args.negative_define:
for define in args.negative_define:
generate_negative_definition(out, define)
def main():
parse_args()
header_stream = StringIO("")
generate_header(header_stream)
contents = header_stream.getvalue()
if args.output:
# Check if the contents has changed before writing so we don't cause build
# churn.
old_contents = None
if os.path.exists(args.output):
with open(args.output, 'r') as f:
old_contents = f.read()
if old_contents != contents:
with open(args.output, 'w') as f:
f.write(contents)
else:
print(contents)
if __name__ == '__main__':
main()
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