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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 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_SNAPSHOT_SOURCE_SINK_H_ | 5 #ifndef V8_SNAPSHOT_SOURCE_SINK_H_ |
6 #define V8_SNAPSHOT_SOURCE_SINK_H_ | 6 #define V8_SNAPSHOT_SOURCE_SINK_H_ |
7 | 7 |
8 #include "src/base/logging.h" | 8 #include "src/base/logging.h" |
9 #include "src/utils.h" | 9 #include "src/utils.h" |
10 | 10 |
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32 int32_t GetUnalignedInt(); | 32 int32_t GetUnalignedInt(); |
33 | 33 |
34 void Advance(int by) { position_ += by; } | 34 void Advance(int by) { position_ += by; } |
35 | 35 |
36 void CopyRaw(byte* to, int number_of_bytes); | 36 void CopyRaw(byte* to, int number_of_bytes); |
37 | 37 |
38 inline int GetInt() { | 38 inline int GetInt() { |
39 // This way of variable-length encoding integers does not suffer from branch | 39 // This way of variable-length encoding integers does not suffer from branch |
40 // mispredictions. | 40 // mispredictions. |
41 uint32_t answer = GetUnalignedInt(); | 41 uint32_t answer = GetUnalignedInt(); |
42 int bytes = answer & 3; | 42 int bytes = (answer & 3) + 1; |
43 Advance(bytes); | 43 Advance(bytes); |
44 uint32_t mask = 0xffffffffu; | 44 uint32_t mask = 0xffffffffu; |
45 mask >>= 32 - (bytes << 3); | 45 mask >>= 32 - (bytes << 3); |
46 answer &= mask; | 46 answer &= mask; |
47 answer >>= 2; | 47 answer >>= 2; |
48 return answer; | 48 return answer; |
49 } | 49 } |
50 | 50 |
51 bool GetBlob(const byte** data, int* number_of_bytes); | 51 bool GetBlob(const byte** data, int* number_of_bytes); |
52 | 52 |
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116 virtual int Position() OVERRIDE { return data_->length(); } | 116 virtual int Position() OVERRIDE { return data_->length(); } |
117 | 117 |
118 private: | 118 private: |
119 i::List<byte>* data_; | 119 i::List<byte>* data_; |
120 }; | 120 }; |
121 | 121 |
122 } // namespace v8::internal | 122 } // namespace v8::internal |
123 } // namespace v8 | 123 } // namespace v8 |
124 | 124 |
125 #endif // V8_SNAPSHOT_SOURCE_SINK_H_ | 125 #endif // V8_SNAPSHOT_SOURCE_SINK_H_ |
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