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//===-- sanitizer_atomic_clang_other.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_CLANG_OTHER_H
#define SANITIZER_ATOMIC_CLANG_OTHER_H
namespace __sanitizer {
inline void proc_yield(int cnt) {
__asm__ __volatile__("" ::: "memory");
}
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;
if (sizeof(*a) < 8 || sizeof(void*) == 8) {
// Assume that aligned loads are atomic.
if (mo == memory_order_relaxed) {
v = a->val_dont_use;
} else if (mo == memory_order_consume) {
// Assume that processor respects data dependencies
// (and that compiler won't break them).
__asm__ __volatile__("" ::: "memory");
v = a->val_dont_use;
__asm__ __volatile__("" ::: "memory");
} else if (mo == memory_order_acquire) {
__asm__ __volatile__("" ::: "memory");
v = a->val_dont_use;
__sync_synchronize();
} else { // seq_cst
// E.g. on POWER we need a hw fence even before the store.
__sync_synchronize();
v = a->val_dont_use;
__sync_synchronize();
}
} else {
__atomic_load(const_cast<typename T::Type volatile *>(&a->val_dont_use), &v,
__ATOMIC_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)));
if (sizeof(*a) < 8 || sizeof(void*) == 8) {
// Assume that aligned loads are atomic.
if (mo == memory_order_relaxed) {
a->val_dont_use = v;
} else if (mo == memory_order_release) {
__sync_synchronize();
a->val_dont_use = v;
__asm__ __volatile__("" ::: "memory");
} else { // seq_cst
__sync_synchronize();
a->val_dont_use = v;
__sync_synchronize();
}
} else {
__atomic_store(&a->val_dont_use, &v, __ATOMIC_SEQ_CST);
}
}
} // namespace __sanitizer
#endif // #ifndef SANITIZER_ATOMIC_CLANG_OTHER_H
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