diff options
Diffstat (limited to 'libsanitizer/sanitizer_common/sanitizer_atomic_clang.h')
-rw-r--r-- | libsanitizer/sanitizer_common/sanitizer_atomic_clang.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/libsanitizer/sanitizer_common/sanitizer_atomic_clang.h b/libsanitizer/sanitizer_common/sanitizer_atomic_clang.h new file mode 100644 index 00000000000..68e79f6a2f1 --- /dev/null +++ b/libsanitizer/sanitizer_common/sanitizer_atomic_clang.h @@ -0,0 +1,120 @@ +//===-- sanitizer_atomic_clang.h --------------------------------*- C++ -*-===// +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file is a part of ThreadSanitizer/AddressSanitizer runtime. +// Not intended for direct inclusion. Include sanitizer_atomic.h. +// +//===----------------------------------------------------------------------===// + +#ifndef SANITIZER_ATOMIC_CLANG_H +#define SANITIZER_ATOMIC_CLANG_H + +namespace __sanitizer { + +INLINE void atomic_signal_fence(memory_order) { + __asm__ __volatile__("" ::: "memory"); +} + +INLINE void atomic_thread_fence(memory_order) { + __sync_synchronize(); +} + +INLINE void proc_yield(int cnt) { + __asm__ __volatile__("" ::: "memory"); +#if defined(__i386__) || defined(__x86_64__) + for (int i = 0; i < cnt; i++) + __asm__ __volatile__("pause"); +#endif + __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 (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))); + 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); +} + +template<typename T> +INLINE typename T::Type atomic_fetch_add(volatile T *a, + typename T::Type v, memory_order mo) { + (void)mo; + DCHECK(!((uptr)a % sizeof(*a))); + return __sync_fetch_and_add(&a->val_dont_use, v); +} + +template<typename T> +INLINE typename T::Type atomic_fetch_sub(volatile T *a, + typename T::Type v, memory_order mo) { + (void)mo; + DCHECK(!((uptr)a % sizeof(*a))); + return __sync_fetch_and_add(&a->val_dont_use, -v); +} + +template<typename T> +INLINE typename T::Type atomic_exchange(volatile T *a, + typename T::Type v, memory_order mo) { + DCHECK(!((uptr)a % sizeof(*a))); + if (mo & (memory_order_release | memory_order_acq_rel | memory_order_seq_cst)) + __sync_synchronize(); + v = __sync_lock_test_and_set(&a->val_dont_use, v); + if (mo == memory_order_seq_cst) + __sync_synchronize(); + return v; +} + +template<typename T> +INLINE bool atomic_compare_exchange_strong(volatile T *a, + typename T::Type *cmp, + typename T::Type xchg, + memory_order mo) { + typedef typename T::Type Type; + Type cmpv = *cmp; + Type prev = __sync_val_compare_and_swap(&a->val_dont_use, cmpv, xchg); + 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 |