libsanitizer/sanitizer_common/sanitizer_atomic_msvc.h

   1 //===-- sanitizer_atomic_msvc.h ---------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file is a part of ThreadSanitizer/AddressSanitizer runtime.
  10 // Not intended for direct inclusion. Include sanitizer_atomic.h.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef SANITIZER_ATOMIC_MSVC_H
  15 #define SANITIZER_ATOMIC_MSVC_H
  16
  17 extern "C" void _ReadWriteBarrier();
  18 #pragma intrinsic(_ReadWriteBarrier)
  19 extern "C" void _mm_mfence();
  20 #pragma intrinsic(_mm_mfence)
  21 extern "C" void _mm_pause();
  22 #pragma intrinsic(_mm_pause)
  23 extern "C" char _InterlockedExchange8(char volatile *Addend, char Value);
  24 #pragma intrinsic(_InterlockedExchange8)
  25 extern "C" short _InterlockedExchange16(short volatile *Addend, short Value);
  26 #pragma intrinsic(_InterlockedExchange16)
  27 extern "C" long _InterlockedExchange(long volatile *Addend, long Value);
  28 #pragma intrinsic(_InterlockedExchange)
  29 extern "C" long _InterlockedExchangeAdd(long volatile *Addend, long Value);
  30 #pragma intrinsic(_InterlockedExchangeAdd)
  31 extern "C" char _InterlockedCompareExchange8(char volatile *Destination,
  32                                              char Exchange, char Comparand);
  33 #pragma intrinsic(_InterlockedCompareExchange8)
  34 extern "C" short _InterlockedCompareExchange16(short volatile *Destination,
  35                                                short Exchange, short Comparand);
  36 #pragma intrinsic(_InterlockedCompareExchange16)
  37 extern "C" long long _InterlockedCompareExchange64(
  38     long long volatile *Destination, long long Exchange, long long Comparand);
  39 #pragma intrinsic(_InterlockedCompareExchange64)
  40 extern "C" void *_InterlockedCompareExchangePointer(
  41     void *volatile *Destination,
  42     void *Exchange, void *Comparand);
  43 #pragma intrinsic(_InterlockedCompareExchangePointer)
  44 extern "C" long __cdecl _InterlockedCompareExchange(long volatile *Destination,
  45                                                     long Exchange,
  46                                                     long Comparand);
  47 #pragma intrinsic(_InterlockedCompareExchange)
  48
  49 #ifdef _WIN64
  50 extern "C" long long _InterlockedExchangeAdd64(long long volatile *Addend,
  51                                                long long Value);
  52 #pragma intrinsic(_InterlockedExchangeAdd64)
  53 #endif
  54
  55 namespace __sanitizer {
  56
  57 inline void atomic_signal_fence(memory_order) {
  58   _ReadWriteBarrier();
  59 }
  60
  61 inline void atomic_thread_fence(memory_order) {
  62   _mm_mfence();
  63 }
  64
  65 inline void proc_yield(int cnt) {
  66   for (int i = 0; i < cnt; i++)
  67     _mm_pause();
  68 }
  69
  70 template<typename T>
  71 inline typename T::Type atomic_load(
  72     const volatile T *a, memory_order mo) {
  73   DCHECK(mo & (memory_order_relaxed | memory_order_consume
  74       | memory_order_acquire | memory_order_seq_cst));
  75   DCHECK(!((uptr)a % sizeof(*a)));
  76   typename T::Type v;
  77   // FIXME(dvyukov): 64-bit load is not atomic on 32-bits.
  78   if (mo == memory_order_relaxed) {
  79     v = a->val_dont_use;
  80   } else {
  81     atomic_signal_fence(memory_order_seq_cst);
  82     v = a->val_dont_use;
  83     atomic_signal_fence(memory_order_seq_cst);
  84   }
  85   return v;
  86 }
  87
  88 template<typename T>
  89 inline void atomic_store(volatile T *a, typename T::Type v, memory_order mo) {
  90   DCHECK(mo & (memory_order_relaxed | memory_order_release
  91       | memory_order_seq_cst));
  92   DCHECK(!((uptr)a % sizeof(*a)));
  93   // FIXME(dvyukov): 64-bit store is not atomic on 32-bits.
  94   if (mo == memory_order_relaxed) {
  95     a->val_dont_use = v;
  96   } else {
  97     atomic_signal_fence(memory_order_seq_cst);
  98     a->val_dont_use = v;
  99     atomic_signal_fence(memory_order_seq_cst);
 100   }
 101   if (mo == memory_order_seq_cst)
 102     atomic_thread_fence(memory_order_seq_cst);
 103 }
 104
 105 inline u32 atomic_fetch_add(volatile atomic_uint32_t *a,
 106     u32 v, memory_order mo) {
 107   (void)mo;
 108   DCHECK(!((uptr)a % sizeof(*a)));
 109   return (u32)_InterlockedExchangeAdd((volatile long *)&a->val_dont_use,
 110                                       (long)v);
 111 }
 112
 113 inline uptr atomic_fetch_add(volatile atomic_uintptr_t *a,
 114     uptr v, memory_order mo) {
 115   (void)mo;
 116   DCHECK(!((uptr)a % sizeof(*a)));
 117 #ifdef _WIN64
 118   return (uptr)_InterlockedExchangeAdd64((volatile long long *)&a->val_dont_use,
 119                                          (long long)v);
 120 #else
 121   return (uptr)_InterlockedExchangeAdd((volatile long *)&a->val_dont_use,
 122                                        (long)v);
 123 #endif
 124 }
 125
 126 inline u32 atomic_fetch_sub(volatile atomic_uint32_t *a,
 127     u32 v, memory_order mo) {
 128   (void)mo;
 129   DCHECK(!((uptr)a % sizeof(*a)));
 130   return (u32)_InterlockedExchangeAdd((volatile long *)&a->val_dont_use,
 131                                       -(long)v);
 132 }
 133
 134 inline uptr atomic_fetch_sub(volatile atomic_uintptr_t *a,
 135     uptr v, memory_order mo) {
 136   (void)mo;
 137   DCHECK(!((uptr)a % sizeof(*a)));
 138 #ifdef _WIN64
 139   return (uptr)_InterlockedExchangeAdd64((volatile long long *)&a->val_dont_use,
 140                                          -(long long)v);
 141 #else
 142   return (uptr)_InterlockedExchangeAdd((volatile long *)&a->val_dont_use,
 143                                        -(long)v);
 144 #endif
 145 }
 146
 147 inline u8 atomic_exchange(volatile atomic_uint8_t *a,
 148     u8 v, memory_order mo) {
 149   (void)mo;
 150   DCHECK(!((uptr)a % sizeof(*a)));
 151   return (u8)_InterlockedExchange8((volatile char*)&a->val_dont_use, v);
 152 }
 153
 154 inline u16 atomic_exchange(volatile atomic_uint16_t *a,
 155     u16 v, memory_order mo) {
 156   (void)mo;
 157   DCHECK(!((uptr)a % sizeof(*a)));
 158   return (u16)_InterlockedExchange16((volatile short*)&a->val_dont_use, v);
 159 }
 160
 161 inline u32 atomic_exchange(volatile atomic_uint32_t *a,
 162     u32 v, memory_order mo) {
 163   (void)mo;
 164   DCHECK(!((uptr)a % sizeof(*a)));
 165   return (u32)_InterlockedExchange((volatile long*)&a->val_dont_use, v);
 166 }
 167
 168 inline bool atomic_compare_exchange_strong(volatile atomic_uint8_t *a,
 169                                            u8 *cmp,
 170                                            u8 xchgv,
 171                                            memory_order mo) {
 172   (void)mo;
 173   DCHECK(!((uptr)a % sizeof(*a)));
 174   u8 cmpv = *cmp;
 175 #ifdef _WIN64
 176   u8 prev = (u8)_InterlockedCompareExchange8(
 177       (volatile char*)&a->val_dont_use, (char)xchgv, (char)cmpv);
 178 #else
 179   u8 prev;
 180   __asm {
 181     mov al, cmpv
 182     mov ecx, a
 183     mov dl, xchgv
 184     lock cmpxchg [ecx], dl
 185     mov prev, al
 186   }
 187 #endif
 188   if (prev == cmpv)
 189     return true;
 190   *cmp = prev;
 191   return false;
 192 }
 193
 194 inline bool atomic_compare_exchange_strong(volatile atomic_uintptr_t *a,
 195                                            uptr *cmp,
 196                                            uptr xchg,
 197                                            memory_order mo) {
 198   uptr cmpv = *cmp;
 199   uptr prev = (uptr)_InterlockedCompareExchangePointer(
 200       (void*volatile*)&a->val_dont_use, (void*)xchg, (void*)cmpv);
 201   if (prev == cmpv)
 202     return true;
 203   *cmp = prev;
 204   return false;
 205 }
 206
 207 inline bool atomic_compare_exchange_strong(volatile atomic_uint16_t *a,
 208                                            u16 *cmp,
 209                                            u16 xchg,
 210                                            memory_order mo) {
 211   u16 cmpv = *cmp;
 212   u16 prev = (u16)_InterlockedCompareExchange16(
 213       (volatile short*)&a->val_dont_use, (short)xchg, (short)cmpv);
 214   if (prev == cmpv)
 215     return true;
 216   *cmp = prev;
 217   return false;
 218 }
 219
 220 inline bool atomic_compare_exchange_strong(volatile atomic_uint32_t *a,
 221                                            u32 *cmp,
 222                                            u32 xchg,
 223                                            memory_order mo) {
 224   u32 cmpv = *cmp;
 225   u32 prev = (u32)_InterlockedCompareExchange(
 226       (volatile long*)&a->val_dont_use, (long)xchg, (long)cmpv);
 227   if (prev == cmpv)
 228     return true;
 229   *cmp = prev;
 230   return false;
 231 }
 232
 233 inline bool atomic_compare_exchange_strong(volatile atomic_uint64_t *a,
 234                                            u64 *cmp,
 235                                            u64 xchg,
 236                                            memory_order mo) {
 237   u64 cmpv = *cmp;
 238   u64 prev = (u64)_InterlockedCompareExchange64(
 239       (volatile long long*)&a->val_dont_use, (long long)xchg, (long long)cmpv);
 240   if (prev == cmpv)
 241     return true;
 242   *cmp = prev;
 243   return false;
 244 }
 245
 246 template<typename T>
 247 inline bool atomic_compare_exchange_weak(volatile T *a,
 248                                          typename T::Type *cmp,
 249                                          typename T::Type xchg,
 250                                          memory_order mo) {
 251   return atomic_compare_exchange_strong(a, cmp, xchg, mo);
 252 }
 253
 254 }  // namespace __sanitizer
 255
 256 #endif  // SANITIZER_ATOMIC_CLANG_H