| Dmitry Vyukov | e8cee12 | 2012-06-29 18:00:38 +0000 | [diff] [blame] | 1 | //===-- sanitizer_atomic_clang.h --------------------------------*- C++ -*-===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file is a part of ThreadSanitizer/AddressSanitizer runtime. |
| 11 | // Not intended for direct inclusion. Include sanitizer_atomic.h. |
| 12 | // |
| 13 | //===----------------------------------------------------------------------===// |
| 14 | |
| 15 | #ifndef SANITIZER_ATOMIC_CLANG_H |
| 16 | #define SANITIZER_ATOMIC_CLANG_H |
| 17 | |
| 18 | namespace __sanitizer { |
| 19 | |
| 20 | INLINE void atomic_signal_fence(memory_order) { |
| 21 | __asm__ __volatile__("" ::: "memory"); |
| 22 | } |
| 23 | |
| 24 | INLINE void atomic_thread_fence(memory_order) { |
| 25 | __sync_synchronize(); |
| 26 | } |
| 27 | |
| 28 | INLINE void proc_yield(int cnt) { |
| 29 | __asm__ __volatile__("" ::: "memory"); |
| 30 | #if defined(__i386__) || defined(__x86_64__) |
| 31 | for (int i = 0; i < cnt; i++) |
| 32 | __asm__ __volatile__("pause"); |
| 33 | #endif |
| 34 | __asm__ __volatile__("" ::: "memory"); |
| 35 | } |
| 36 | |
| 37 | template<typename T> |
| 38 | INLINE typename T::Type atomic_load( |
| 39 | const volatile T *a, memory_order mo) { |
| 40 | DCHECK(mo & (memory_order_relaxed | memory_order_consume |
| 41 | | memory_order_acquire | memory_order_seq_cst)); |
| 42 | DCHECK(!((uptr)a % sizeof(*a))); |
| 43 | typename T::Type v; |
| 44 | if (mo == memory_order_relaxed) { |
| 45 | v = a->val_dont_use; |
| 46 | } else { |
| 47 | atomic_signal_fence(memory_order_seq_cst); |
| 48 | v = a->val_dont_use; |
| 49 | atomic_signal_fence(memory_order_seq_cst); |
| 50 | } |
| 51 | return v; |
| 52 | } |
| 53 | |
| 54 | template<typename T> |
| 55 | INLINE void atomic_store(volatile T *a, typename T::Type v, memory_order mo) { |
| 56 | DCHECK(mo & (memory_order_relaxed | memory_order_release |
| 57 | | memory_order_seq_cst)); |
| 58 | DCHECK(!((uptr)a % sizeof(*a))); |
| 59 | if (mo == memory_order_relaxed) { |
| 60 | a->val_dont_use = v; |
| 61 | } else { |
| 62 | atomic_signal_fence(memory_order_seq_cst); |
| 63 | a->val_dont_use = v; |
| 64 | atomic_signal_fence(memory_order_seq_cst); |
| 65 | } |
| 66 | if (mo == memory_order_seq_cst) |
| 67 | atomic_thread_fence(memory_order_seq_cst); |
| 68 | } |
| 69 | |
| 70 | template<typename T> |
| 71 | INLINE typename T::Type atomic_fetch_add(volatile T *a, |
| 72 | typename T::Type v, memory_order mo) { |
| 73 | (void)mo; |
| 74 | DCHECK(!((uptr)a % sizeof(*a))); |
| 75 | return __sync_fetch_and_add(&a->val_dont_use, v); |
| 76 | } |
| 77 | |
| 78 | template<typename T> |
| 79 | INLINE typename T::Type atomic_fetch_sub(volatile T *a, |
| 80 | typename T::Type v, memory_order mo) { |
| 81 | (void)mo; |
| 82 | DCHECK(!((uptr)a % sizeof(*a))); |
| 83 | return __sync_fetch_and_add(&a->val_dont_use, -v); |
| 84 | } |
| 85 | |
| 86 | template<typename T> |
| 87 | INLINE typename T::Type atomic_exchange(volatile T *a, |
| 88 | typename T::Type v, memory_order mo) { |
| 89 | DCHECK(!((uptr)a % sizeof(*a))); |
| 90 | if (mo & (memory_order_release | memory_order_acq_rel | memory_order_seq_cst)) |
| 91 | __sync_synchronize(); |
| 92 | v = __sync_lock_test_and_set(&a->val_dont_use, v); |
| 93 | if (mo == memory_order_seq_cst) |
| 94 | __sync_synchronize(); |
| 95 | return v; |
| 96 | } |
| 97 | |
| 98 | template<typename T> |
| 99 | INLINE bool atomic_compare_exchange_strong(volatile T *a, |
| 100 | typename T::Type *cmp, |
| 101 | typename T::Type xchg, |
| 102 | memory_order mo) { |
| 103 | typedef typename T::Type Type; |
| 104 | Type cmpv = *cmp; |
| 105 | Type prev = __sync_val_compare_and_swap(&a->val_dont_use, cmpv, xchg); |
| 106 | if (prev == cmpv) |
| 107 | return true; |
| 108 | *cmp = prev; |
| 109 | return false; |
| 110 | } |
| 111 | |
| 112 | template<typename T> |
| 113 | INLINE bool atomic_compare_exchange_weak(volatile T *a, |
| 114 | typename T::Type *cmp, |
| 115 | typename T::Type xchg, |
| 116 | memory_order mo) { |
| 117 | return atomic_compare_exchange_strong(a, cmp, xchg, mo); |
| 118 | } |
| 119 | |
| 120 | } // namespace __sanitizer |
| 121 | |
| 122 | #endif // SANITIZER_ATOMIC_CLANG_H |