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Issue 80513004: Revert 17963, 17962 and 17955: Random number generator in JS changes (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Remove Yang's changes, too Created 7 years ago
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1 #!/usr/bin/env python
2 #
3 # Copyright 2013 the V8 project authors. All rights reserved.
4 # Redistribution and use in source and binary forms, with or without
5 # modification, are permitted provided that the following conditions are
6 # met:
7 #
8 # * Redistributions of source code must retain the above copyright
9 # notice, this list of conditions and the following disclaimer.
10 # * Redistributions in binary form must reproduce the above
11 # copyright notice, this list of conditions and the following
12 # disclaimer in the documentation and/or other materials provided
13 # with the distribution.
14 # * Neither the name of Google Inc. nor the names of its
15 # contributors may be used to endorse or promote products derived
16 # from this software without specific prior written permission.
17 #
18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
30 # This is a utility for populating the lookup table for the
31 # approximation of trigonometric functions.
32
33 import sys, math
34
35 SAMPLES = 1800
36
37 TEMPLATE = """\
38 // Copyright 2013 Google Inc. All Rights Reserved.
39
40 // This file was generated from a python script.
41
42 #include "v8.h"
43 #include "trig-table.h"
44
45 namespace v8 {
46 namespace internal {
47
48 const double TrigonometricLookupTable::kSinTable[] =
49 { %(sine_table)s };
50 const double TrigonometricLookupTable::kCosXIntervalTable[] =
51 { %(cosine_table)s };
52 const int TrigonometricLookupTable::kSamples = %(samples)i;
53 const int TrigonometricLookupTable::kTableSize = %(table_size)i;
54 const double TrigonometricLookupTable::kSamplesOverPiHalf =
55 %(samples_over_pi_half)s;
56
57 } } // v8::internal
58 """
59
60 def main():
61 pi_half = math.pi / 2
62 interval = pi_half / SAMPLES
63 sin = []
64 cos_times_interval = []
65 table_size = SAMPLES + 2
66
67 for i in range(0, table_size):
68 sample = i * interval
69 sin.append(repr(math.sin(sample)))
70 cos_times_interval.append(repr(math.cos(sample) * interval))
71
72 output_file = sys.argv[1]
73 output = open(str(output_file), "w")
74 output.write(TEMPLATE % {
75 'sine_table': ','.join(sin),
76 'cosine_table': ','.join(cos_times_interval),
77 'samples': SAMPLES,
78 'table_size': table_size,
79 'samples_over_pi_half': repr(SAMPLES / pi_half)
80 })
81
82 if __name__ == "__main__":
83 main()
84
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