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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 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
| 3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
| 4 // met: | 4 // met: |
| 5 // | 5 // |
| 6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
| 7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
| 8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
| 9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
| 10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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| 52 static void SetEntropySource(EntropySource entropy_source); | 52 static void SetEntropySource(EntropySource entropy_source); |
| 53 | 53 |
| 54 RandomNumberGenerator(); | 54 RandomNumberGenerator(); |
| 55 explicit RandomNumberGenerator(int64_t seed) { SetSeed(seed); } | 55 explicit RandomNumberGenerator(int64_t seed) { SetSeed(seed); } |
| 56 | 56 |
| 57 // Returns the next pseudorandom, uniformly distributed int value from this | 57 // Returns the next pseudorandom, uniformly distributed int value from this |
| 58 // random number generator's sequence. The general contract of |NextInt()| is | 58 // random number generator's sequence. The general contract of |NextInt()| is |
| 59 // that one int value is pseudorandomly generated and returned. | 59 // that one int value is pseudorandomly generated and returned. |
| 60 // All 2^32 possible integer values are produced with (approximately) equal | 60 // All 2^32 possible integer values are produced with (approximately) equal |
| 61 // probability. | 61 // probability. |
| 62 V8_INLINE(int NextInt()) V8_WARN_UNUSED_RESULT { | 62 V8_INLINE int NextInt() V8_WARN_UNUSED_RESULT { |
| 63 return Next(32); | 63 return Next(32); |
| 64 } | 64 } |
| 65 | 65 |
| 66 // Returns a pseudorandom, uniformly distributed int value between 0 | 66 // Returns a pseudorandom, uniformly distributed int value between 0 |
| 67 // (inclusive) and the specified max value (exclusive), drawn from this random | 67 // (inclusive) and the specified max value (exclusive), drawn from this random |
| 68 // number generator's sequence. The general contract of |NextInt(int)| is that | 68 // number generator's sequence. The general contract of |NextInt(int)| is that |
| 69 // one int value in the specified range is pseudorandomly generated and | 69 // one int value in the specified range is pseudorandomly generated and |
| 70 // returned. All max possible int values are produced with (approximately) | 70 // returned. All max possible int values are produced with (approximately) |
| 71 // equal probability. | 71 // equal probability. |
| 72 int NextInt(int max) V8_WARN_UNUSED_RESULT; | 72 int NextInt(int max) V8_WARN_UNUSED_RESULT; |
| 73 | 73 |
| 74 // Returns the next pseudorandom, uniformly distributed boolean value from | 74 // Returns the next pseudorandom, uniformly distributed boolean value from |
| 75 // this random number generator's sequence. The general contract of | 75 // this random number generator's sequence. The general contract of |
| 76 // |NextBoolean()| is that one boolean value is pseudorandomly generated and | 76 // |NextBoolean()| is that one boolean value is pseudorandomly generated and |
| 77 // returned. The values true and false are produced with (approximately) equal | 77 // returned. The values true and false are produced with (approximately) equal |
| 78 // probability. | 78 // probability. |
| 79 V8_INLINE(bool NextBool()) V8_WARN_UNUSED_RESULT { | 79 V8_INLINE bool NextBool() V8_WARN_UNUSED_RESULT { |
| 80 return Next(1) != 0; | 80 return Next(1) != 0; |
| 81 } | 81 } |
| 82 | 82 |
| 83 // Returns the next pseudorandom, uniformly distributed double value between | 83 // Returns the next pseudorandom, uniformly distributed double value between |
| 84 // 0.0 and 1.0 from this random number generator's sequence. | 84 // 0.0 and 1.0 from this random number generator's sequence. |
| 85 // The general contract of |NextDouble()| is that one double value, chosen | 85 // The general contract of |NextDouble()| is that one double value, chosen |
| 86 // (approximately) uniformly from the range 0.0 (inclusive) to 1.0 | 86 // (approximately) uniformly from the range 0.0 (inclusive) to 1.0 |
| 87 // (exclusive), is pseudorandomly generated and returned. | 87 // (exclusive), is pseudorandomly generated and returned. |
| 88 double NextDouble() V8_WARN_UNUSED_RESULT; | 88 double NextDouble() V8_WARN_UNUSED_RESULT; |
| 89 | 89 |
| 90 // Fills the elements of a specified array of bytes with random numbers. | 90 // Fills the elements of a specified array of bytes with random numbers. |
| 91 void NextBytes(void* buffer, size_t buflen); | 91 void NextBytes(void* buffer, size_t buflen); |
| 92 | 92 |
| 93 private: | 93 private: |
| 94 static const int64_t kMultiplier = V8_2PART_UINT64_C(0x5, deece66d); | 94 static const int64_t kMultiplier = V8_2PART_UINT64_C(0x5, deece66d); |
| 95 static const int64_t kAddend = 0xb; | 95 static const int64_t kAddend = 0xb; |
| 96 static const int64_t kMask = V8_2PART_UINT64_C(0xffff, ffffffff); | 96 static const int64_t kMask = V8_2PART_UINT64_C(0xffff, ffffffff); |
| 97 | 97 |
| 98 int Next(int bits) V8_WARN_UNUSED_RESULT; | 98 int Next(int bits) V8_WARN_UNUSED_RESULT; |
| 99 void SetSeed(int64_t seed); | 99 void SetSeed(int64_t seed); |
| 100 | 100 |
| 101 int64_t seed_; | 101 int64_t seed_; |
| 102 }; | 102 }; |
| 103 | 103 |
| 104 } } // namespace v8::internal | 104 } } // namespace v8::internal |
| 105 | 105 |
| 106 #endif // V8_UTILS_RANDOM_NUMBER_GENERATOR_H_ | 106 #endif // V8_UTILS_RANDOM_NUMBER_GENERATOR_H_ |
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