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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #ifndef RUNTIME_VM_BITFIELD_H_ | 5 #ifndef RUNTIME_VM_BITFIELD_H_ |
6 #define RUNTIME_VM_BITFIELD_H_ | 6 #define RUNTIME_VM_BITFIELD_H_ |
7 | 7 |
| 8 #include "platform/globals.h" |
| 9 |
8 namespace dart { | 10 namespace dart { |
9 | 11 |
10 static const uword kUwordOne = 1U; | 12 static const uword kUwordOne = 1U; |
11 | 13 |
12 // BitField is a template for encoding and decoding a value of type T | 14 // BitField is a template for encoding and decoding a value of type T |
13 // inside a storage of type S. | 15 // inside a storage of type S. |
14 template <typename S, typename T, int position, int size> | 16 template <typename S, typename T, int position, int size> |
15 class BitField { | 17 class BitField { |
16 public: | 18 public: |
17 static const intptr_t kNextBit = position + size; | 19 static const intptr_t kNextBit = position + size; |
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52 // will be changed. | 54 // will be changed. |
53 static S update(T value, S original) { | 55 static S update(T value, S original) { |
54 ASSERT(is_valid(value)); | 56 ASSERT(is_valid(value)); |
55 return (static_cast<S>(value) << position) | (~mask_in_place() & original); | 57 return (static_cast<S>(value) << position) | (~mask_in_place() & original); |
56 } | 58 } |
57 }; | 59 }; |
58 | 60 |
59 } // namespace dart | 61 } // namespace dart |
60 | 62 |
61 #endif // RUNTIME_VM_BITFIELD_H_ | 63 #endif // RUNTIME_VM_BITFIELD_H_ |
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