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//===-- sanitizer_atomic_msvc.h ---------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer/AddressSanitizer runtime.
// Not intended for direct inclusion. Include sanitizer_atomic.h.
//
//===----------------------------------------------------------------------===//
#ifndef SANITIZER_ATOMIC_MSVC_H
#define SANITIZER_ATOMIC_MSVC_H
extern "C" void _ReadWriteBarrier();
#pragma intrinsic(_ReadWriteBarrier)
extern "C" void _mm_mfence();
#pragma intrinsic(_mm_mfence)
extern "C" void _mm_pause();
#pragma intrinsic(_mm_pause)
extern "C" char _InterlockedExchange8(char volatile *Addend, char Value);
#pragma intrinsic(_InterlockedExchange8)
extern "C" short _InterlockedExchange16(short volatile *Addend, short Value);
#pragma intrinsic(_InterlockedExchange16)
extern "C" long _InterlockedExchange(long volatile *Addend, long Value);
#pragma intrinsic(_InterlockedExchange)
extern "C" long _InterlockedExchangeAdd(long volatile *Addend, long Value);
#pragma intrinsic(_InterlockedExchangeAdd)
extern "C" char _InterlockedCompareExchange8(char volatile *Destination,
char Exchange, char Comparand);
#pragma intrinsic(_InterlockedCompareExchange8)
extern "C" short _InterlockedCompareExchange16(short volatile *Destination,
short Exchange, short Comparand);
#pragma intrinsic(_InterlockedCompareExchange16)
extern "C" long long _InterlockedCompareExchange64(
long long volatile *Destination, long long Exchange, long long Comparand);
#pragma intrinsic(_InterlockedCompareExchange64)
extern "C" void *_InterlockedCompareExchangePointer(
void *volatile *Destination,
void *Exchange, void *Comparand);
#pragma intrinsic(_InterlockedCompareExchangePointer)
extern "C" long __cdecl _InterlockedCompareExchange(long volatile *Destination,
long Exchange,
long Comparand);
#pragma intrinsic(_InterlockedCompareExchange)
#ifdef _WIN64
extern "C" long long _InterlockedExchangeAdd64(long long volatile *Addend,
long long Value);
#pragma intrinsic(_InterlockedExchangeAdd64)
#endif
namespace __sanitizer {
inline void atomic_signal_fence(memory_order) {
_ReadWriteBarrier();
}
inline void atomic_thread_fence(memory_order) {
_mm_mfence();
}
inline void proc_yield(int cnt) {
for (int i = 0; i < cnt; i++)
_mm_pause();
}
template<typename T>
inline typename T::Type atomic_load(
const volatile T *a, memory_order mo) {
DCHECK(mo & (memory_order_relaxed | memory_order_consume
| memory_order_acquire | memory_order_seq_cst));
DCHECK(!((uptr)a % sizeof(*a)));
typename T::Type v;
// FIXME(dvyukov): 64-bit load is not atomic on 32-bits.
if (mo == memory_order_relaxed) {
v = a->val_dont_use;
} else {
atomic_signal_fence(memory_order_seq_cst);
v = a->val_dont_use;
atomic_signal_fence(memory_order_seq_cst);
}
return v;
}
template<typename T>
inline void atomic_store(volatile T *a, typename T::Type v, memory_order mo) {
DCHECK(mo & (memory_order_relaxed | memory_order_release
| memory_order_seq_cst));
DCHECK(!((uptr)a % sizeof(*a)));
// FIXME(dvyukov): 64-bit store is not atomic on 32-bits.
if (mo == memory_order_relaxed) {
a->val_dont_use = v;
} else {
atomic_signal_fence(memory_order_seq_cst);
a->val_dont_use = v;
atomic_signal_fence(memory_order_seq_cst);
}
if (mo == memory_order_seq_cst)
atomic_thread_fence(memory_order_seq_cst);
}
inline u32 atomic_fetch_add(volatile atomic_uint32_t *a,
u32 v, memory_order mo) {
(void)mo;
DCHECK(!((uptr)a % sizeof(*a)));
return (u32)_InterlockedExchangeAdd((volatile long *)&a->val_dont_use,
(long)v);
}
inline uptr atomic_fetch_add(volatile atomic_uintptr_t *a,
uptr v, memory_order mo) {
(void)mo;
DCHECK(!((uptr)a % sizeof(*a)));
#ifdef _WIN64
return (uptr)_InterlockedExchangeAdd64((volatile long long *)&a->val_dont_use,
(long long)v);
#else
return (uptr)_InterlockedExchangeAdd((volatile long *)&a->val_dont_use,
(long)v);
#endif
}
inline u32 atomic_fetch_sub(volatile atomic_uint32_t *a,
u32 v, memory_order mo) {
(void)mo;
DCHECK(!((uptr)a % sizeof(*a)));
return (u32)_InterlockedExchangeAdd((volatile long *)&a->val_dont_use,
-(long)v);
}
inline uptr atomic_fetch_sub(volatile atomic_uintptr_t *a,
uptr v, memory_order mo) {
(void)mo;
DCHECK(!((uptr)a % sizeof(*a)));
#ifdef _WIN64
return (uptr)_InterlockedExchangeAdd64((volatile long long *)&a->val_dont_use,
-(long long)v);
#else
return (uptr)_InterlockedExchangeAdd((volatile long *)&a->val_dont_use,
-(long)v);
#endif
}
inline u8 atomic_exchange(volatile atomic_uint8_t *a,
u8 v, memory_order mo) {
(void)mo;
DCHECK(!((uptr)a % sizeof(*a)));
return (u8)_InterlockedExchange8((volatile char*)&a->val_dont_use, v);
}
inline u16 atomic_exchange(volatile atomic_uint16_t *a,
u16 v, memory_order mo) {
(void)mo;
DCHECK(!((uptr)a % sizeof(*a)));
return (u16)_InterlockedExchange16((volatile short*)&a->val_dont_use, v);
}
inline u32 atomic_exchange(volatile atomic_uint32_t *a,
u32 v, memory_order mo) {
(void)mo;
DCHECK(!((uptr)a % sizeof(*a)));
return (u32)_InterlockedExchange((volatile long*)&a->val_dont_use, v);
}
inline bool atomic_compare_exchange_strong(volatile atomic_uint8_t *a,
u8 *cmp,
u8 xchgv,
memory_order mo) {
(void)mo;
DCHECK(!((uptr)a % sizeof(*a)));
u8 cmpv = *cmp;
#ifdef _WIN64
u8 prev = (u8)_InterlockedCompareExchange8(
(volatile char*)&a->val_dont_use, (char)xchgv, (char)cmpv);
#else
u8 prev;
__asm {
mov al, cmpv
mov ecx, a
mov dl, xchgv
lock cmpxchg [ecx], dl
mov prev, al
}
#endif
if (prev == cmpv)
return true;
*cmp = prev;
return false;
}
inline bool atomic_compare_exchange_strong(volatile atomic_uintptr_t *a,
uptr *cmp,
uptr xchg,
memory_order mo) {
uptr cmpv = *cmp;
uptr prev = (uptr)_InterlockedCompareExchangePointer(
(void*volatile*)&a->val_dont_use, (void*)xchg, (void*)cmpv);
if (prev == cmpv)
return true;
*cmp = prev;
return false;
}
inline bool atomic_compare_exchange_strong(volatile atomic_uint16_t *a,
u16 *cmp,
u16 xchg,
memory_order mo) {
u16 cmpv = *cmp;
u16 prev = (u16)_InterlockedCompareExchange16(
(volatile short*)&a->val_dont_use, (short)xchg, (short)cmpv);
if (prev == cmpv)
return true;
*cmp = prev;
return false;
}
inline bool atomic_compare_exchange_strong(volatile atomic_uint32_t *a,
u32 *cmp,
u32 xchg,
memory_order mo) {
u32 cmpv = *cmp;
u32 prev = (u32)_InterlockedCompareExchange(
(volatile long*)&a->val_dont_use, (long)xchg, (long)cmpv);
if (prev == cmpv)
return true;
*cmp = prev;
return false;
}
inline bool atomic_compare_exchange_strong(volatile atomic_uint64_t *a,
u64 *cmp,
u64 xchg,
memory_order mo) {
u64 cmpv = *cmp;
u64 prev = (u64)_InterlockedCompareExchange64(
(volatile long long*)&a->val_dont_use, (long long)xchg, (long long)cmpv);
if (prev == cmpv)
return true;
*cmp = prev;
return false;
}
template<typename T>
inline bool atomic_compare_exchange_weak(volatile T *a,
typename T::Type *cmp,
typename T::Type xchg,
memory_order mo) {
return atomic_compare_exchange_strong(a, cmp, xchg, mo);
}
} // namespace __sanitizer
#endif // SANITIZER_ATOMIC_CLANG_H
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