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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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