| Dmitry Vyukov | e8cee12 | 2012-06-29 18:00:38 +0000 | [diff] [blame^] | 1 | //===-- sanitizer_atomic_msvc.h ---------------------------------*- C++ -*-===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file is a part of ThreadSanitizer/AddressSanitizer runtime. |
| 11 | // Not intended for direct inclusion. Include sanitizer_atomic.h. |
| 12 | // |
| 13 | //===----------------------------------------------------------------------===// |
| 14 | |
| 15 | #ifndef SANITIZER_ATOMIC_MSVC_H |
| 16 | #define SANITIZER_ATOMIC_MSVC_H |
| 17 | |
| 18 | #include <intrin.h> |
| 19 | |
| 20 | namespace __sanitizer { |
| 21 | |
| 22 | INLINE void atomic_signal_fence(memory_order) { |
| 23 | _ReadWriteBarrier(); |
| 24 | } |
| 25 | |
| 26 | INLINE void atomic_thread_fence(memory_order) { |
| 27 | _mm_mfence(); |
| 28 | } |
| 29 | |
| 30 | INLINE void proc_yield(int cnt) { |
| 31 | for (int i = 0; i < cnt; i++) |
| 32 | _mm_pause(); |
| 33 | } |
| 34 | |
| 35 | template<typename T> |
| 36 | INLINE typename T::Type atomic_load( |
| 37 | const volatile T *a, memory_order mo) { |
| 38 | DCHECK(mo & (memory_order_relaxed | memory_order_consume |
| 39 | | memory_order_acquire | memory_order_seq_cst)); |
| 40 | DCHECK(!((uptr)a % sizeof(*a))); |
| 41 | typename T::Type v; |
| 42 | if (mo == memory_order_relaxed) { |
| 43 | v = a->val_dont_use; |
| 44 | } else { |
| 45 | atomic_signal_fence(memory_order_seq_cst); |
| 46 | v = a->val_dont_use; |
| 47 | atomic_signal_fence(memory_order_seq_cst); |
| 48 | } |
| 49 | return v; |
| 50 | } |
| 51 | |
| 52 | template<typename T> |
| 53 | INLINE void atomic_store(volatile T *a, typename T::Type v, memory_order mo) { |
| 54 | DCHECK(mo & (memory_order_relaxed | memory_order_release |
| 55 | | memory_order_seq_cst)); |
| 56 | DCHECK(!((uptr)a % sizeof(*a))); |
| 57 | if (mo == memory_order_relaxed) { |
| 58 | a->val_dont_use = v; |
| 59 | } else { |
| 60 | atomic_signal_fence(memory_order_seq_cst); |
| 61 | a->val_dont_use = v; |
| 62 | atomic_signal_fence(memory_order_seq_cst); |
| 63 | } |
| 64 | if (mo == memory_order_seq_cst) |
| 65 | atomic_thread_fence(memory_order_seq_cst); |
| 66 | } |
| 67 | |
| 68 | INLINE u32 atomic_fetch_add(volatile atomic_uint32_t *a, |
| 69 | u32 v, memory_order mo) { |
| 70 | (void)mo; |
| 71 | DCHECK(!((uptr)a % sizeof(*a))); |
| 72 | return (u32)_InterlockedExchangeAdd( |
| 73 | (volatile long*)&a->val_dont_use, (long)v); // NOLINT |
| 74 | } |
| 75 | |
| 76 | INLINE u8 atomic_exchange(volatile atomic_uint8_t *a, |
| 77 | u8 v, memory_order mo) { |
| 78 | (void)mo; |
| 79 | DCHECK(!((uptr)a % sizeof(*a))); |
| 80 | __asm { |
| 81 | mov eax, a |
| 82 | mov cx, v |
| 83 | xchg [eax], cx // NOLINT |
| 84 | mov v, cx |
| 85 | } |
| 86 | return v; |
| 87 | } |
| 88 | |
| 89 | INLINE u16 atomic_exchange(volatile atomic_uint16_t *a, |
| 90 | u16 v, memory_order mo) { |
| 91 | (void)mo; |
| 92 | DCHECK(!((uptr)a % sizeof(*a))); |
| 93 | __asm { |
| 94 | mov eax, a |
| 95 | mov cl, v |
| 96 | xchg [eax], cl // NOLINT |
| 97 | mov v, cl |
| 98 | } |
| 99 | return v; |
| 100 | } |
| 101 | |
| 102 | } // namespace __sanitizer |
| 103 | |
| 104 | #endif // SANITIZER_ATOMIC_CLANG_H |