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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_UTILS_H_ | 5 #ifndef V8_UTILS_H_ |
6 #define V8_UTILS_H_ | 6 #define V8_UTILS_H_ |
7 | 7 |
8 #include <limits.h> | 8 #include <limits.h> |
9 #include <stdlib.h> | 9 #include <stdlib.h> |
10 #include <string.h> | 10 #include <string.h> |
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223 return (previous & ~kMask) | encode(value); | 223 return (previous & ~kMask) | encode(value); |
224 } | 224 } |
225 | 225 |
226 // Extracts the bit field from the value. | 226 // Extracts the bit field from the value. |
227 static T decode(U value) { | 227 static T decode(U value) { |
228 return static_cast<T>((value & kMask) >> shift); | 228 return static_cast<T>((value & kMask) >> shift); |
229 } | 229 } |
230 }; | 230 }; |
231 | 231 |
232 | 232 |
| 233 template <class T, int shift, int size> |
| 234 class BitField8 : public BitFieldBase<T, shift, size, uint8_t> {}; |
| 235 |
| 236 |
| 237 template <class T, int shift, int size> |
| 238 class BitField16 : public BitFieldBase<T, shift, size, uint16_t> {}; |
| 239 |
| 240 |
233 template<class T, int shift, int size> | 241 template<class T, int shift, int size> |
234 class BitField : public BitFieldBase<T, shift, size, uint32_t> { }; | 242 class BitField : public BitFieldBase<T, shift, size, uint32_t> { }; |
235 | 243 |
236 | 244 |
237 template<class T, int shift, int size> | 245 template<class T, int shift, int size> |
238 class BitField64 : public BitFieldBase<T, shift, size, uint64_t> { }; | 246 class BitField64 : public BitFieldBase<T, shift, size, uint64_t> { }; |
239 | 247 |
240 | 248 |
241 // ---------------------------------------------------------------------------- | 249 // ---------------------------------------------------------------------------- |
242 // BitSetComputer is a help template for encoding and decoding information for | 250 // BitSetComputer is a help template for encoding and decoding information for |
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1529 // Takes the address of the limit variable in order to find out where | 1537 // Takes the address of the limit variable in order to find out where |
1530 // the top of stack is right now. | 1538 // the top of stack is right now. |
1531 uintptr_t limit = reinterpret_cast<uintptr_t>(&limit); | 1539 uintptr_t limit = reinterpret_cast<uintptr_t>(&limit); |
1532 return limit; | 1540 return limit; |
1533 } | 1541 } |
1534 | 1542 |
1535 } // namespace internal | 1543 } // namespace internal |
1536 } // namespace v8 | 1544 } // namespace v8 |
1537 | 1545 |
1538 #endif // V8_UTILS_H_ | 1546 #endif // V8_UTILS_H_ |
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