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1 // Copyright 2010 the V8 project authors. All rights reserved. | 1 // Copyright 2010 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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100 } | 100 } |
101 return x; | 101 return x; |
102 } | 102 } |
103 | 103 |
104 inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr, | 104 inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr, |
105 Atomic32 old_value, | 105 Atomic32 old_value, |
106 Atomic32 new_value) { | 106 Atomic32 new_value) { |
107 return NoBarrier_CompareAndSwap(ptr, old_value, new_value); | 107 return NoBarrier_CompareAndSwap(ptr, old_value, new_value); |
108 } | 108 } |
109 | 109 |
| 110 inline void NoBarrier_Store(volatile Atomic8* ptr, Atomic8 value) { |
| 111 *ptr = value; |
| 112 } |
| 113 |
110 inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) { | 114 inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) { |
111 *ptr = value; | 115 *ptr = value; |
112 } | 116 } |
113 | 117 |
114 #if defined(__x86_64__) | 118 #if defined(__x86_64__) |
115 | 119 |
116 // 64-bit implementations of memory barrier can be simpler, because it | 120 // 64-bit implementations of memory barrier can be simpler, because it |
117 // "mfence" is guaranteed to exist. | 121 // "mfence" is guaranteed to exist. |
118 inline void MemoryBarrier() { | 122 inline void MemoryBarrier() { |
119 __asm__ __volatile__("mfence" : : : "memory"); | 123 __asm__ __volatile__("mfence" : : : "memory"); |
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145 } | 149 } |
146 } | 150 } |
147 #endif | 151 #endif |
148 | 152 |
149 inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) { | 153 inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) { |
150 ATOMICOPS_COMPILER_BARRIER(); | 154 ATOMICOPS_COMPILER_BARRIER(); |
151 *ptr = value; // An x86 store acts as a release barrier. | 155 *ptr = value; // An x86 store acts as a release barrier. |
152 // See comments in Atomic64 version of Release_Store(), below. | 156 // See comments in Atomic64 version of Release_Store(), below. |
153 } | 157 } |
154 | 158 |
| 159 inline Atomic8 NoBarrier_Load(volatile const Atomic8* ptr) { |
| 160 return *ptr; |
| 161 } |
| 162 |
155 inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) { | 163 inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) { |
156 return *ptr; | 164 return *ptr; |
157 } | 165 } |
158 | 166 |
159 inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) { | 167 inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) { |
160 Atomic32 value = *ptr; // An x86 load acts as a acquire barrier. | 168 Atomic32 value = *ptr; // An x86 load acts as a acquire barrier. |
161 // See comments in Atomic64 version of Release_Store(), below. | 169 // See comments in Atomic64 version of Release_Store(), below. |
162 ATOMICOPS_COMPILER_BARRIER(); | 170 ATOMICOPS_COMPILER_BARRIER(); |
163 return value; | 171 return value; |
164 } | 172 } |
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278 return NoBarrier_CompareAndSwap(ptr, old_value, new_value); | 286 return NoBarrier_CompareAndSwap(ptr, old_value, new_value); |
279 } | 287 } |
280 | 288 |
281 #endif // defined(__x86_64__) | 289 #endif // defined(__x86_64__) |
282 | 290 |
283 } } // namespace v8::internal | 291 } } // namespace v8::internal |
284 | 292 |
285 #undef ATOMICOPS_COMPILER_BARRIER | 293 #undef ATOMICOPS_COMPILER_BARRIER |
286 | 294 |
287 #endif // V8_ATOMICOPS_INTERNALS_X86_GCC_H_ | 295 #endif // V8_ATOMICOPS_INTERNALS_X86_GCC_H_ |
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