1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
#!/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 in format NAME or NAME=VALUE'
)
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_str):
# Split the define into name and value if it contains '='
if '=' in define_str:
define, value = define_str.split('=', 1)
else:
define = define_str
value = "1" # Default value if not specified
out.write('''
#ifndef {define}
#define {define} {value}
#else
#if {define} != {value}
#error "{define} defined but not set to {value}"
#endif
#endif // {define}
'''.format(define=define, value=value))
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()
|
