157 lines
4.5 KiB
C++
157 lines
4.5 KiB
C++
//===-- sanitizer_atomic_msvc.h ---------------------------------*- C++ -*-===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of ThreadSanitizer/AddressSanitizer runtime.
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// Not intended for direct inclusion. Include sanitizer_atomic.h.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SANITIZER_ATOMIC_MSVC_H
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#define SANITIZER_ATOMIC_MSVC_H
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extern "C" void _ReadWriteBarrier();
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#pragma intrinsic(_ReadWriteBarrier)
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extern "C" void _mm_mfence();
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#pragma intrinsic(_mm_mfence)
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extern "C" void _mm_pause();
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#pragma intrinsic(_mm_pause)
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extern "C" long _InterlockedExchangeAdd( // NOLINT
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long volatile * Addend, long Value); // NOLINT
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#pragma intrinsic(_InterlockedExchangeAdd)
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#ifdef _WIN64
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extern "C" void *_InterlockedCompareExchangePointer(
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void *volatile *Destination,
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void *Exchange, void *Comparand);
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#pragma intrinsic(_InterlockedCompareExchangePointer)
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#else
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// There's no _InterlockedCompareExchangePointer intrinsic on x86,
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// so call _InterlockedCompareExchange instead.
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extern "C"
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long __cdecl _InterlockedCompareExchange( // NOLINT
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long volatile *Destination, // NOLINT
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long Exchange, long Comparand); // NOLINT
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#pragma intrinsic(_InterlockedCompareExchange)
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inline static void *_InterlockedCompareExchangePointer(
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void *volatile *Destination,
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void *Exchange, void *Comparand) {
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return reinterpret_cast<void*>(
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_InterlockedCompareExchange(
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reinterpret_cast<long volatile*>(Destination), // NOLINT
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reinterpret_cast<long>(Exchange), // NOLINT
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reinterpret_cast<long>(Comparand))); // NOLINT
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}
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#endif
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namespace __sanitizer {
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INLINE void atomic_signal_fence(memory_order) {
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_ReadWriteBarrier();
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}
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INLINE void atomic_thread_fence(memory_order) {
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_mm_mfence();
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}
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INLINE void proc_yield(int cnt) {
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for (int i = 0; i < cnt; i++)
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_mm_pause();
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}
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template<typename T>
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INLINE typename T::Type atomic_load(
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const volatile T *a, memory_order mo) {
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DCHECK(mo & (memory_order_relaxed | memory_order_consume
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| memory_order_acquire | memory_order_seq_cst));
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DCHECK(!((uptr)a % sizeof(*a)));
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typename T::Type v;
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if (mo == memory_order_relaxed) {
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v = a->val_dont_use;
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} else {
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atomic_signal_fence(memory_order_seq_cst);
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v = a->val_dont_use;
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atomic_signal_fence(memory_order_seq_cst);
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}
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return v;
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}
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template<typename T>
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INLINE void atomic_store(volatile T *a, typename T::Type v, memory_order mo) {
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DCHECK(mo & (memory_order_relaxed | memory_order_release
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| memory_order_seq_cst));
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DCHECK(!((uptr)a % sizeof(*a)));
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if (mo == memory_order_relaxed) {
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a->val_dont_use = v;
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} else {
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atomic_signal_fence(memory_order_seq_cst);
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a->val_dont_use = v;
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atomic_signal_fence(memory_order_seq_cst);
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}
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if (mo == memory_order_seq_cst)
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atomic_thread_fence(memory_order_seq_cst);
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}
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INLINE u32 atomic_fetch_add(volatile atomic_uint32_t *a,
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u32 v, memory_order mo) {
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(void)mo;
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DCHECK(!((uptr)a % sizeof(*a)));
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return (u32)_InterlockedExchangeAdd(
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(volatile long*)&a->val_dont_use, (long)v); // NOLINT
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}
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INLINE u8 atomic_exchange(volatile atomic_uint8_t *a,
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u8 v, memory_order mo) {
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(void)mo;
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DCHECK(!((uptr)a % sizeof(*a)));
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__asm {
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mov eax, a
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mov cl, v
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xchg [eax], cl // NOLINT
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mov v, cl
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}
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return v;
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}
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INLINE u16 atomic_exchange(volatile atomic_uint16_t *a,
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u16 v, memory_order mo) {
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(void)mo;
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DCHECK(!((uptr)a % sizeof(*a)));
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__asm {
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mov eax, a
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mov cx, v
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xchg [eax], cx // NOLINT
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mov v, cx
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}
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return v;
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}
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INLINE bool atomic_compare_exchange_strong(volatile atomic_uintptr_t *a,
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uptr *cmp,
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uptr xchg,
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memory_order mo) {
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uptr cmpv = *cmp;
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uptr prev = (uptr)_InterlockedCompareExchangePointer(
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(void*volatile*)&a->val_dont_use, (void*)xchg, (void*)cmpv);
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if (prev == cmpv)
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return true;
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*cmp = prev;
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return false;
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}
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template<typename T>
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INLINE bool atomic_compare_exchange_weak(volatile T *a,
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typename T::Type *cmp,
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typename T::Type xchg,
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memory_order mo) {
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return atomic_compare_exchange_strong(a, cmp, xchg, mo);
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}
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} // namespace __sanitizer
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#endif // SANITIZER_ATOMIC_CLANG_H
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