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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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215 // have to compute 2^32 without using a shift count of 32. | 215 // have to compute 2^32 without using a shift count of 32. |
216 return ((1U << shift) << size) - (1U << shift); | 216 return ((1U << shift) << size) - (1U << shift); |
217 } | 217 } |
218 | 218 |
219 // Returns a uint32_t with the bit field value encoded. | 219 // Returns a uint32_t with the bit field value encoded. |
220 static uint32_t encode(T value) { | 220 static uint32_t encode(T value) { |
221 ASSERT(is_valid(value)); | 221 ASSERT(is_valid(value)); |
222 return static_cast<uint32_t>(value) << shift; | 222 return static_cast<uint32_t>(value) << shift; |
223 } | 223 } |
224 | 224 |
| 225 // Returns a uint32_t with the bit field value updated. |
| 226 static uint32_t update(uint32_t previous, T value) { |
| 227 return (previous & ~mask()) | encode(value); |
| 228 } |
| 229 |
225 // Extracts the bit field from the value. | 230 // Extracts the bit field from the value. |
226 static T decode(uint32_t value) { | 231 static T decode(uint32_t value) { |
227 return static_cast<T>((value & mask()) >> shift); | 232 return static_cast<T>((value & mask()) >> shift); |
228 } | 233 } |
229 | 234 |
230 // Value for the field with all bits set. | 235 // Value for the field with all bits set. |
231 static T max() { | 236 static T max() { |
232 return decode(mask()); | 237 return decode(mask()); |
233 } | 238 } |
234 }; | 239 }; |
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786 INLINE(Dest BitCast(const Source& source)); | 791 INLINE(Dest BitCast(const Source& source)); |
787 | 792 |
788 template <class Dest, class Source> | 793 template <class Dest, class Source> |
789 inline Dest BitCast(const Source& source) { | 794 inline Dest BitCast(const Source& source) { |
790 return BitCastHelper<Dest, Source>::cast(source); | 795 return BitCastHelper<Dest, Source>::cast(source); |
791 } | 796 } |
792 | 797 |
793 } } // namespace v8::internal | 798 } } // namespace v8::internal |
794 | 799 |
795 #endif // V8_UTILS_H_ | 800 #endif // V8_UTILS_H_ |
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