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Side by Side Diff: src/utils/random-number-generator.h

Issue 347223004: Remove dependency from platform.h implementations on isolate (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 6 years, 6 months ago
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1 // Copyright 2013 the V8 project authors. All rights reserved. 1 // Copyright 2013 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef V8_UTILS_RANDOM_NUMBER_GENERATOR_H_ 5 #ifndef V8_UTILS_RANDOM_NUMBER_GENERATOR_H_
6 #define V8_UTILS_RANDOM_NUMBER_GENERATOR_H_ 6 #define V8_UTILS_RANDOM_NUMBER_GENERATOR_H_
7 7
8 #include "src/base/macros.h" 8 #include "src/base/macros.h"
9 9
10 namespace v8 { 10 namespace v8 {
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64 // Returns the next pseudorandom, uniformly distributed double value between 64 // Returns the next pseudorandom, uniformly distributed double value between
65 // 0.0 and 1.0 from this random number generator's sequence. 65 // 0.0 and 1.0 from this random number generator's sequence.
66 // The general contract of |NextDouble()| is that one double value, chosen 66 // The general contract of |NextDouble()| is that one double value, chosen
67 // (approximately) uniformly from the range 0.0 (inclusive) to 1.0 67 // (approximately) uniformly from the range 0.0 (inclusive) to 1.0
68 // (exclusive), is pseudorandomly generated and returned. 68 // (exclusive), is pseudorandomly generated and returned.
69 double NextDouble() V8_WARN_UNUSED_RESULT; 69 double NextDouble() V8_WARN_UNUSED_RESULT;
70 70
71 // Fills the elements of a specified array of bytes with random numbers. 71 // Fills the elements of a specified array of bytes with random numbers.
72 void NextBytes(void* buffer, size_t buflen); 72 void NextBytes(void* buffer, size_t buflen);
73 73
74 // Override the current ssed.
75 void SetSeed(int64_t seed);
76
74 private: 77 private:
75 static const int64_t kMultiplier = V8_2PART_UINT64_C(0x5, deece66d); 78 static const int64_t kMultiplier = V8_2PART_UINT64_C(0x5, deece66d);
76 static const int64_t kAddend = 0xb; 79 static const int64_t kAddend = 0xb;
77 static const int64_t kMask = V8_2PART_UINT64_C(0xffff, ffffffff); 80 static const int64_t kMask = V8_2PART_UINT64_C(0xffff, ffffffff);
78 81
79 int Next(int bits) V8_WARN_UNUSED_RESULT; 82 int Next(int bits) V8_WARN_UNUSED_RESULT;
80 void SetSeed(int64_t seed);
81 83
82 int64_t seed_; 84 int64_t seed_;
83 }; 85 };
84 86
85 } } // namespace v8::internal 87 } } // namespace v8::internal
86 88
87 #endif // V8_UTILS_RANDOM_NUMBER_GENERATOR_H_ 89 #endif // V8_UTILS_RANDOM_NUMBER_GENERATOR_H_
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