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 extern "C" void _ReadWriteBarrier(); 19 #pragma intrinsic(_ReadWriteBarrier) 20 extern "C" void _mm_mfence(); 21 #pragma intrinsic(_mm_mfence) 22 extern "C" void _mm_pause(); 23 #pragma intrinsic(_mm_pause) 24 extern "C" long _InterlockedExchangeAdd( // NOLINT 25 long volatile * Addend, long Value); // NOLINT 26 #pragma intrinsic(_InterlockedExchangeAdd) 27 28 #ifdef _WIN64 29 extern "C" void *_InterlockedCompareExchangePointer( 30 void *volatile *Destination, 31 void *Exchange, void *Comparand); 32 #pragma intrinsic(_InterlockedCompareExchangePointer) 33 #else 34 // There's no _InterlockedCompareExchangePointer intrinsic on x86, 35 // so call _InterlockedCompareExchange instead. 36 extern "C" 37 long __cdecl _InterlockedCompareExchange( // NOLINT 38 long volatile *Destination, // NOLINT 39 long Exchange, long Comparand); // NOLINT 40 #pragma intrinsic(_InterlockedCompareExchange) 41 42 inline static void *_InterlockedCompareExchangePointer( 43 void *volatile *Destination, 44 void *Exchange, void *Comparand) { 45 return reinterpret_cast<void*>( 46 _InterlockedCompareExchange( 47 reinterpret_cast<long volatile*>(Destination), // NOLINT 48 reinterpret_cast<long>(Exchange), // NOLINT 49 reinterpret_cast<long>(Comparand))); // NOLINT 50 } 51 #endif 52 53 namespace __sanitizer { 54 55 INLINE void atomic_signal_fence(memory_order) { 56 _ReadWriteBarrier(); 57 } 58 59 INLINE void atomic_thread_fence(memory_order) { 60 _mm_mfence(); 61 } 62 63 INLINE void proc_yield(int cnt) { 64 for (int i = 0; i < cnt; i++) 65 _mm_pause(); 66 } 67 68 template<typename T> 69 INLINE typename T::Type atomic_load( 70 const volatile T *a, memory_order mo) { 71 DCHECK(mo & (memory_order_relaxed | memory_order_consume 72 | memory_order_acquire | memory_order_seq_cst)); 73 DCHECK(!((uptr)a % sizeof(*a))); 74 typename T::Type v; 75 // FIXME(dvyukov): 64-bit load is not atomic on 32-bits. 76 if (mo == memory_order_relaxed) { 77 v = a->val_dont_use; 78 } else { 79 atomic_signal_fence(memory_order_seq_cst); 80 v = a->val_dont_use; 81 atomic_signal_fence(memory_order_seq_cst); 82 } 83 return v; 84 } 85 86 template<typename T> 87 INLINE void atomic_store(volatile T *a, typename T::Type v, memory_order mo) { 88 DCHECK(mo & (memory_order_relaxed | memory_order_release 89 | memory_order_seq_cst)); 90 DCHECK(!((uptr)a % sizeof(*a))); 91 // FIXME(dvyukov): 64-bit store is not atomic on 32-bits. 92 if (mo == memory_order_relaxed) { 93 a->val_dont_use = v; 94 } else { 95 atomic_signal_fence(memory_order_seq_cst); 96 a->val_dont_use = v; 97 atomic_signal_fence(memory_order_seq_cst); 98 } 99 if (mo == memory_order_seq_cst) 100 atomic_thread_fence(memory_order_seq_cst); 101 } 102 103 INLINE u32 atomic_fetch_add(volatile atomic_uint32_t *a, 104 u32 v, memory_order mo) { 105 (void)mo; 106 DCHECK(!((uptr)a % sizeof(*a))); 107 return (u32)_InterlockedExchangeAdd( 108 (volatile long*)&a->val_dont_use, (long)v); // NOLINT 109 } 110 111 INLINE u8 atomic_exchange(volatile atomic_uint8_t *a, 112 u8 v, memory_order mo) { 113 (void)mo; 114 DCHECK(!((uptr)a % sizeof(*a))); 115 __asm { 116 mov eax, a 117 mov cl, v 118 xchg [eax], cl // NOLINT 119 mov v, cl 120 } 121 return v; 122 } 123 124 INLINE u16 atomic_exchange(volatile atomic_uint16_t *a, 125 u16 v, memory_order mo) { 126 (void)mo; 127 DCHECK(!((uptr)a % sizeof(*a))); 128 __asm { 129 mov eax, a 130 mov cx, v 131 xchg [eax], cx // NOLINT 132 mov v, cx 133 } 134 return v; 135 } 136 137 INLINE bool atomic_compare_exchange_strong(volatile atomic_uintptr_t *a, 138 uptr *cmp, 139 uptr xchg, 140 memory_order mo) { 141 uptr cmpv = *cmp; 142 uptr prev = (uptr)_InterlockedCompareExchangePointer( 143 (void*volatile*)&a->val_dont_use, (void*)xchg, (void*)cmpv); 144 if (prev == cmpv) 145 return true; 146 *cmp = prev; 147 return false; 148 } 149 150 template<typename T> 151 INLINE bool atomic_compare_exchange_weak(volatile T *a, 152 typename T::Type *cmp, 153 typename T::Type xchg, 154 memory_order mo) { 155 return atomic_compare_exchange_strong(a, cmp, xchg, mo); 156 } 157 158 } // namespace __sanitizer 159 160 #endif // SANITIZER_ATOMIC_CLANG_H 161
