b6ba105467
Bug: v8:9871 Change-Id: I4084771cfc4d34f8e1b9d5265e115f9eac1098d8 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2646165 Reviewed-by: Dan Elphick <delphick@chromium.org> Reviewed-by: Michael Achenbach <machenbach@chromium.org> Commit-Queue: Gus Caplan <snek@chromium.org> Cr-Commit-Position: refs/heads/master@{#72293}
86 lines
2.6 KiB
Python
Executable File
86 lines
2.6 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright 2021 the V8 project authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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import argparse
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import os
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import sys
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if (sys.version_info >= (3, 0)):
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from io import StringIO
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else:
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from io import BytesIO as StringIO
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def parse_args():
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global args
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parser = argparse.ArgumentParser()
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parser.add_argument('-o', '--output', type=str, action='store',
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help='Location of header file to generate')
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parser.add_argument('-p', '--positive-define', type=str, action='append',
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help='Externally visibile positive definition')
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parser.add_argument('-n', '--negative-define', type=str, action='append',
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help='Externally visibile negative definition')
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args = parser.parse_args()
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def generate_positive_definition(out, define):
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out.write('''
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#ifndef {define}
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#define {define} 1
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#else
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#if {define} != 1
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#error "{define} defined but not set to 1"
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#endif
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#endif // {define}
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'''.format(define=define))
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def generate_negative_definition(out, define):
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out.write('''
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#ifdef {define}
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#error "{define} is defined but is disabled by V8's GN build arguments"
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#endif // {define}
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'''.format(define=define))
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def generate_header(out):
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out.write('''// AUTOMATICALLY GENERATED. DO NOT EDIT.
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// The following definitions were used when V8 itself was built, but also appear
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// in the externally-visible header files and so must be included by any
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// embedder. This will be done automatically if V8_GN_HEADER is defined.
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// Ready-compiled distributions of V8 will need to provide this generated header
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// along with the other headers in include.
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// This header must be stand-alone because it is used across targets without
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// introducing dependencies. It should only be included via v8config.h.
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''')
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if args.positive_define:
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for define in args.positive_define:
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generate_positive_definition(out, define)
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if args.negative_define:
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for define in args.negative_define:
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generate_negative_definition(out, define)
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def main():
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parse_args()
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header_stream = StringIO("")
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generate_header(header_stream)
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contents = header_stream.getvalue()
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if args.output:
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# Check if the contents has changed before writing so we don't cause build
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# churn.
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old_contents = None
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if os.path.exists(args.output):
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with open(args.output, 'r') as f:
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old_contents = f.read()
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if old_contents != contents:
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with open(args.output, 'w') as f:
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f.write(contents)
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else:
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print(contents)
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if __name__ == '__main__':
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main()
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