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99 lines
3.7 KiB
C++
Vendored
99 lines
3.7 KiB
C++
Vendored
//===-- sanitizer_atomic_clang.h --------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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_CLANG_H
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#define SANITIZER_ATOMIC_CLANG_H
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namespace __sanitizer {
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// We use the compiler builtin atomic operations for loads and stores, which
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// generates correct code for all architectures, but may require libatomic
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// on platforms where e.g. 64-bit atomics are not supported natively.
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// See http://www.cl.cam.ac.uk/~pes20/cpp/cpp0xmappings.html
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// for mappings of the memory model to different processors.
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inline void atomic_signal_fence(memory_order mo) { __atomic_signal_fence(mo); }
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inline void atomic_thread_fence(memory_order mo) { __atomic_thread_fence(mo); }
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inline void proc_yield(int cnt) {
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__asm__ __volatile__("" ::: "memory");
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#if defined(__i386__) || defined(__x86_64__)
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for (int i = 0; i < cnt; i++) __asm__ __volatile__("pause");
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__asm__ __volatile__("" ::: "memory");
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#endif
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}
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template <typename T>
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inline typename T::Type atomic_load(const volatile T *a, memory_order mo) {
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DCHECK(mo == memory_order_relaxed || mo == memory_order_consume ||
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mo == memory_order_acquire || mo == memory_order_seq_cst);
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DCHECK(!((uptr)a % sizeof(*a)));
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return __atomic_load_n(&a->val_dont_use, mo);
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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 || mo == memory_order_release ||
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mo == memory_order_seq_cst);
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DCHECK(!((uptr)a % sizeof(*a)));
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__atomic_store_n(&a->val_dont_use, v, mo);
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}
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template <typename T>
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inline typename T::Type atomic_fetch_add(volatile T *a, typename T::Type v,
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memory_order mo) {
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DCHECK(!((uptr)a % sizeof(*a)));
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return __atomic_fetch_add(&a->val_dont_use, v, mo);
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}
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template <typename T>
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inline typename T::Type atomic_fetch_sub(volatile T *a, typename T::Type v,
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memory_order mo) {
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(void)mo;
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DCHECK(!((uptr)a % sizeof(*a)));
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return __atomic_fetch_sub(&a->val_dont_use, v, mo);
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}
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template <typename T>
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inline typename T::Type atomic_exchange(volatile T *a, typename T::Type v,
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memory_order mo) {
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DCHECK(!((uptr)a % sizeof(*a)));
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return __atomic_exchange_n(&a->val_dont_use, v, mo);
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}
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template <typename T>
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inline bool atomic_compare_exchange_strong(volatile T *a, typename T::Type *cmp,
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typename T::Type xchg,
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memory_order mo) {
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// Transitioned from __sync_val_compare_and_swap to support targets like
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// SPARC V8 that cannot inline atomic cmpxchg. __atomic_compare_exchange
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// can then be resolved from libatomic. __ATOMIC_SEQ_CST is used to best
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// match the __sync builtin memory order.
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return __atomic_compare_exchange(&a->val_dont_use, cmp, &xchg, false,
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__ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
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}
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template <typename T>
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inline bool atomic_compare_exchange_weak(volatile T *a, 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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#undef ATOMIC_ORDER
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#endif // SANITIZER_ATOMIC_CLANG_H
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