text: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  // This file is an internal atomic implementation for compiler-based
  // ThreadSanitizer. Use base/atomicops.h instead.
  
  #ifndef BASE_ATOMICOPS_INTERNALS_TSAN_H_
  #define BASE_ATOMICOPS_INTERNALS_TSAN_H_
  
  #include "base/base_export.h"
  
  // This struct is not part of the public API of this module; clients may not
  // use it.  (However, it's exported via BASE_EXPORT because clients implicitly
  // do use it at link time by inlining these functions.)
  // Features of this x86.  Values may not be correct before main() is run,
  // but are set conservatively.
  struct AtomicOps_x86CPUFeatureStruct {
    bool has_amd_lock_mb_bug;  // Processor has AMD memory-barrier bug; do lfence
                               // after acquire compare-and-swap.
    bool has_sse2;             // Processor has SSE2.
  };
  BASE_EXPORT extern struct AtomicOps_x86CPUFeatureStruct
      AtomicOps_Internalx86CPUFeatures;
  
  #define ATOMICOPS_COMPILER_BARRIER() __asm__ __volatile__("" : : : "memory")
  
  namespace base {
  namespace subtle {
  
  #ifndef TSAN_INTERFACE_ATOMIC_H
  #define TSAN_INTERFACE_ATOMIC_H
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  typedef char  __tsan_atomic8;
  typedef short __tsan_atomic16;  // NOLINT
  typedef int   __tsan_atomic32;
  typedef long  __tsan_atomic64;  // NOLINT
  
  #if defined(__SIZEOF_INT128__) \
      || (__clang_major__ * 100 + __clang_minor__ >= 302)
  typedef __int128 __tsan_atomic128;
  #define __TSAN_HAS_INT128 1
  #else
  typedef char     __tsan_atomic128;
  #define __TSAN_HAS_INT128 0
  #endif
  
  typedef enum {
    __tsan_memory_order_relaxed,
    __tsan_memory_order_consume,
    __tsan_memory_order_acquire,
    __tsan_memory_order_release,
    __tsan_memory_order_acq_rel,
    __tsan_memory_order_seq_cst,
  } __tsan_memory_order;
  
  __tsan_atomic8 __tsan_atomic8_load(const volatile __tsan_atomic8 *a,
      __tsan_memory_order mo);
  __tsan_atomic16 __tsan_atomic16_load(const volatile __tsan_atomic16 *a,
      __tsan_memory_order mo);
  __tsan_atomic32 __tsan_atomic32_load(const volatile __tsan_atomic32 *a,
      __tsan_memory_order mo);
  __tsan_atomic64 __tsan_atomic64_load(const volatile __tsan_atomic64 *a,
      __tsan_memory_order mo);
  __tsan_atomic128 __tsan_atomic128_load(const volatile __tsan_atomic128 *a,
      __tsan_memory_order mo);
  
  void __tsan_atomic8_store(volatile __tsan_atomic8 *a, __tsan_atomic8 v,
      __tsan_memory_order mo);
  void __tsan_atomic16_store(volatile __tsan_atomic16 *a, __tsan_atomic16 v,
      __tsan_memory_order mo);
  void __tsan_atomic32_store(volatile __tsan_atomic32 *a, __tsan_atomic32 v,
      __tsan_memory_order mo);
  void __tsan_atomic64_store(volatile __tsan_atomic64 *a, __tsan_atomic64 v,
      __tsan_memory_order mo);
  void __tsan_atomic128_store(volatile __tsan_atomic128 *a, __tsan_atomic128 v,
      __tsan_memory_order mo);
  
  __tsan_atomic8 __tsan_atomic8_exchange(volatile __tsan_atomic8 *a,
      __tsan_atomic8 v, __tsan_memory_order mo);
  __tsan_atomic16 __tsan_atomic16_exchange(volatile __tsan_atomic16 *a,
      __tsan_atomic16 v, __tsan_memory_order mo);
  __tsan_atomic32 __tsan_atomic32_exchange(volatile __tsan_atomic32 *a,
      __tsan_atomic32 v, __tsan_memory_order mo);
  __tsan_atomic64 __tsan_atomic64_exchange(volatile __tsan_atomic64 *a,
      __tsan_atomic64 v, __tsan_memory_order mo);
  __tsan_atomic128 __tsan_atomic128_exchange(volatile __tsan_atomic128 *a,
      __tsan_atomic128 v, __tsan_memory_order mo);
  
  __tsan_atomic8 __tsan_atomic8_fetch_add(volatile __tsan_atomic8 *a,
      __tsan_atomic8 v, __tsan_memory_order mo);
  __tsan_atomic16 __tsan_atomic16_fetch_add(volatile __tsan_atomic16 *a,
      __tsan_atomic16 v, __tsan_memory_order mo);
  __tsan_atomic32 __tsan_atomic32_fetch_add(volatile __tsan_atomic32 *a,
      __tsan_atomic32 v, __tsan_memory_order mo);
  __tsan_atomic64 __tsan_atomic64_fetch_add(volatile __tsan_atomic64 *a,
      __tsan_atomic64 v, __tsan_memory_order mo);
  __tsan_atomic128 __tsan_atomic128_fetch_add(volatile __tsan_atomic128 *a,
      __tsan_atomic128 v, __tsan_memory_order mo);
  
  __tsan_atomic8 __tsan_atomic8_fetch_and(volatile __tsan_atomic8 *a,
      __tsan_atomic8 v, __tsan_memory_order mo);
  __tsan_atomic16 __tsan_atomic16_fetch_and(volatile __tsan_atomic16 *a,
      __tsan_atomic16 v, __tsan_memory_order mo);
  __tsan_atomic32 __tsan_atomic32_fetch_and(volatile __tsan_atomic32 *a,
      __tsan_atomic32 v, __tsan_memory_order mo);
  __tsan_atomic64 __tsan_atomic64_fetch_and(volatile __tsan_atomic64 *a,
      __tsan_atomic64 v, __tsan_memory_order mo);
  __tsan_atomic128 __tsan_atomic128_fetch_and(volatile __tsan_atomic128 *a,
      __tsan_atomic128 v, __tsan_memory_order mo);
  
  __tsan_atomic8 __tsan_atomic8_fetch_or(volatile __tsan_atomic8 *a,
      __tsan_atomic8 v, __tsan_memory_order mo);
  __tsan_atomic16 __tsan_atomic16_fetch_or(volatile __tsan_atomic16 *a,
      __tsan_atomic16 v, __tsan_memory_order mo);
  __tsan_atomic32 __tsan_atomic32_fetch_or(volatile __tsan_atomic32 *a,
      __tsan_atomic32 v, __tsan_memory_order mo);
  __tsan_atomic64 __tsan_atomic64_fetch_or(volatile __tsan_atomic64 *a,
      __tsan_atomic64 v, __tsan_memory_order mo);
  __tsan_atomic128 __tsan_atomic128_fetch_or(volatile __tsan_atomic128 *a,
      __tsan_atomic128 v, __tsan_memory_order mo);
  
  __tsan_atomic8 __tsan_atomic8_fetch_xor(volatile __tsan_atomic8 *a,
      __tsan_atomic8 v, __tsan_memory_order mo);
  __tsan_atomic16 __tsan_atomic16_fetch_xor(volatile __tsan_atomic16 *a,
      __tsan_atomic16 v, __tsan_memory_order mo);
  __tsan_atomic32 __tsan_atomic32_fetch_xor(volatile __tsan_atomic32 *a,
      __tsan_atomic32 v, __tsan_memory_order mo);
  __tsan_atomic64 __tsan_atomic64_fetch_xor(volatile __tsan_atomic64 *a,
      __tsan_atomic64 v, __tsan_memory_order mo);
  __tsan_atomic128 __tsan_atomic128_fetch_xor(volatile __tsan_atomic128 *a,
      __tsan_atomic128 v, __tsan_memory_order mo);
  
  __tsan_atomic8 __tsan_atomic8_fetch_nand(volatile __tsan_atomic8 *a,
      __tsan_atomic8 v, __tsan_memory_order mo);
  __tsan_atomic16 __tsan_atomic16_fetch_nand(volatile __tsan_atomic16 *a,
      __tsan_atomic16 v, __tsan_memory_order mo);
  __tsan_atomic32 __tsan_atomic32_fetch_nand(volatile __tsan_atomic32 *a,
      __tsan_atomic32 v, __tsan_memory_order mo);
  __tsan_atomic64 __tsan_atomic64_fetch_nand(volatile __tsan_atomic64 *a,
      __tsan_atomic64 v, __tsan_memory_order mo);
  __tsan_atomic128 __tsan_atomic128_fetch_nand(volatile __tsan_atomic128 *a,
      __tsan_atomic128 v, __tsan_memory_order mo);
  
  int __tsan_atomic8_compare_exchange_weak(volatile __tsan_atomic8 *a,
      __tsan_atomic8 *c, __tsan_atomic8 v, __tsan_memory_order mo,
      __tsan_memory_order fail_mo);
  int __tsan_atomic16_compare_exchange_weak(volatile __tsan_atomic16 *a,
      __tsan_atomic16 *c, __tsan_atomic16 v, __tsan_memory_order mo,
      __tsan_memory_order fail_mo);
  int __tsan_atomic32_compare_exchange_weak(volatile __tsan_atomic32 *a,
      __tsan_atomic32 *c, __tsan_atomic32 v, __tsan_memory_order mo,
      __tsan_memory_order fail_mo);
  int __tsan_atomic64_compare_exchange_weak(volatile __tsan_atomic64 *a,
      __tsan_atomic64 *c, __tsan_atomic64 v, __tsan_memory_order mo,
      __tsan_memory_order fail_mo);
  int __tsan_atomic128_compare_exchange_weak(volatile __tsan_atomic128 *a,
      __tsan_atomic128 *c, __tsan_atomic128 v, __tsan_memory_order mo,
      __tsan_memory_order fail_mo);
  
  int __tsan_atomic8_compare_exchange_strong(volatile __tsan_atomic8 *a,
      __tsan_atomic8 *c, __tsan_atomic8 v, __tsan_memory_order mo,
      __tsan_memory_order fail_mo);
  int __tsan_atomic16_compare_exchange_strong(volatile __tsan_atomic16 *a,
      __tsan_atomic16 *c, __tsan_atomic16 v, __tsan_memory_order mo,
      __tsan_memory_order fail_mo);
  int __tsan_atomic32_compare_exchange_strong(volatile __tsan_atomic32 *a,
      __tsan_atomic32 *c, __tsan_atomic32 v, __tsan_memory_order mo,
      __tsan_memory_order fail_mo);
  int __tsan_atomic64_compare_exchange_strong(volatile __tsan_atomic64 *a,
      __tsan_atomic64 *c, __tsan_atomic64 v, __tsan_memory_order mo,
      __tsan_memory_order fail_mo);
  int __tsan_atomic128_compare_exchange_strong(volatile __tsan_atomic128 *a,
      __tsan_atomic128 *c, __tsan_atomic128 v, __tsan_memory_order mo,
      __tsan_memory_order fail_mo);
  
  __tsan_atomic8 __tsan_atomic8_compare_exchange_val(
      volatile __tsan_atomic8 *a, __tsan_atomic8 c, __tsan_atomic8 v,
      __tsan_memory_order mo, __tsan_memory_order fail_mo);
  __tsan_atomic16 __tsan_atomic16_compare_exchange_val(
      volatile __tsan_atomic16 *a, __tsan_atomic16 c, __tsan_atomic16 v,
      __tsan_memory_order mo, __tsan_memory_order fail_mo);
  __tsan_atomic32 __tsan_atomic32_compare_exchange_val(
      volatile __tsan_atomic32 *a, __tsan_atomic32 c, __tsan_atomic32 v,
      __tsan_memory_order mo, __tsan_memory_order fail_mo);
  __tsan_atomic64 __tsan_atomic64_compare_exchange_val(
      volatile __tsan_atomic64 *a, __tsan_atomic64 c, __tsan_atomic64 v,
      __tsan_memory_order mo, __tsan_memory_order fail_mo);
  __tsan_atomic128 __tsan_atomic128_compare_exchange_val(
      volatile __tsan_atomic128 *a, __tsan_atomic128 c, __tsan_atomic128 v,
      __tsan_memory_order mo, __tsan_memory_order fail_mo);
  
  void __tsan_atomic_thread_fence(__tsan_memory_order mo);
  void __tsan_atomic_signal_fence(__tsan_memory_order mo);
  
  #ifdef __cplusplus
  }  // extern "C"
  #endif
  
  #endif  // #ifndef TSAN_INTERFACE_ATOMIC_H
  
  inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32 *ptr,
                                    Atomic32 old_value,
                                    Atomic32 new_value) {
    Atomic32 cmp = old_value;
    __tsan_atomic32_compare_exchange_strong(ptr, &cmp, new_value,
        __tsan_memory_order_relaxed, __tsan_memory_order_relaxed);
    return cmp;
  }
  
  inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32 *ptr,
                                    Atomic32 new_value) {
    return __tsan_atomic32_exchange(ptr, new_value,
        __tsan_memory_order_relaxed);
  }
  
  inline Atomic32 Acquire_AtomicExchange(volatile Atomic32 *ptr,
                                  Atomic32 new_value) {
    return __tsan_atomic32_exchange(ptr, new_value,
        __tsan_memory_order_acquire);
  }
  
  inline Atomic32 Release_AtomicExchange(volatile Atomic32 *ptr,
                                  Atomic32 new_value) {
    return __tsan_atomic32_exchange(ptr, new_value,
        __tsan_memory_order_release);
  }
  
  inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32 *ptr,
                                     Atomic32 increment) {
    return increment + __tsan_atomic32_fetch_add(ptr, increment,
        __tsan_memory_order_relaxed);
  }
  
  inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32 *ptr,
                                   Atomic32 increment) {
    return increment + __tsan_atomic32_fetch_add(ptr, increment,
        __tsan_memory_order_acq_rel);
  }
  
  inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32 *ptr,
                                  Atomic32 old_value,
                                  Atomic32 new_value) {
    Atomic32 cmp = old_value;
    __tsan_atomic32_compare_exchange_strong(ptr, &cmp, new_value,
        __tsan_memory_order_acquire, __tsan_memory_order_acquire);
    return cmp;
  }
  
  inline Atomic32 Release_CompareAndSwap(volatile Atomic32 *ptr,
                                  Atomic32 old_value,
                                  Atomic32 new_value) {
    Atomic32 cmp = old_value;
    __tsan_atomic32_compare_exchange_strong(ptr, &cmp, new_value,
        __tsan_memory_order_release, __tsan_memory_order_relaxed);
    return cmp;
  }
  
  inline void NoBarrier_Store(volatile Atomic32 *ptr, Atomic32 value) {
    __tsan_atomic32_store(ptr, value, __tsan_memory_order_relaxed);
  }
  
  inline void Acquire_Store(volatile Atomic32 *ptr, Atomic32 value) {
    __tsan_atomic32_store(ptr, value, __tsan_memory_order_relaxed);
    __tsan_atomic_thread_fence(__tsan_memory_order_seq_cst);
  }
  
  inline void Release_Store(volatile Atomic32 *ptr, Atomic32 value) {
    __tsan_atomic32_store(ptr, value, __tsan_memory_order_release);
  }
  
  inline Atomic32 NoBarrier_Load(volatile const Atomic32 *ptr) {
    return __tsan_atomic32_load(ptr, __tsan_memory_order_relaxed);
  }
  
  inline Atomic32 Acquire_Load(volatile const Atomic32 *ptr) {
    return __tsan_atomic32_load(ptr, __tsan_memory_order_acquire);
  }
  
  inline Atomic32 Release_Load(volatile const Atomic32 *ptr) {
    __tsan_atomic_thread_fence(__tsan_memory_order_seq_cst);
    return __tsan_atomic32_load(ptr, __tsan_memory_order_relaxed);
  }
  
  inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64 *ptr,
                                        Atomic64 old_value,
                                        Atomic64 new_value) {
    Atomic64 cmp = old_value;
    __tsan_atomic64_compare_exchange_strong(ptr, &cmp, new_value,
        __tsan_memory_order_relaxed, __tsan_memory_order_relaxed);
    return cmp;
  }
  
  inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64 *ptr,
                                        Atomic64 new_value) {
    return __tsan_atomic64_exchange(ptr, new_value, __tsan_memory_order_relaxed);
  }
  
  inline Atomic64 Acquire_AtomicExchange(volatile Atomic64 *ptr,
                                      Atomic64 new_value) {
    return __tsan_atomic64_exchange(ptr, new_value, __tsan_memory_order_acquire);
  }
  
  inline Atomic64 Release_AtomicExchange(volatile Atomic64 *ptr,
                                      Atomic64 new_value) {
    return __tsan_atomic64_exchange(ptr, new_value, __tsan_memory_order_release);
  }
  
  inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64 *ptr,
                                         Atomic64 increment) {
    return increment + __tsan_atomic64_fetch_add(ptr, increment,
        __tsan_memory_order_relaxed);
  }
  
  inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64 *ptr,
                                       Atomic64 increment) {
    return increment + __tsan_atomic64_fetch_add(ptr, increment,
        __tsan_memory_order_acq_rel);
  }
  
  inline void NoBarrier_Store(volatile Atomic64 *ptr, Atomic64 value) {
    __tsan_atomic64_store(ptr, value, __tsan_memory_order_relaxed);
  }
  
  inline void Acquire_Store(volatile Atomic64 *ptr, Atomic64 value) {
    __tsan_atomic64_store(ptr, value, __tsan_memory_order_relaxed);
    __tsan_atomic_thread_fence(__tsan_memory_order_seq_cst);
  }
  
  inline void Release_Store(volatile Atomic64 *ptr, Atomic64 value) {
    __tsan_atomic64_store(ptr, value, __tsan_memory_order_release);
  }
  
  inline Atomic64 NoBarrier_Load(volatile const Atomic64 *ptr) {
    return __tsan_atomic64_load(ptr, __tsan_memory_order_relaxed);
  }
  
  inline Atomic64 Acquire_Load(volatile const Atomic64 *ptr) {
    return __tsan_atomic64_load(ptr, __tsan_memory_order_acquire);
  }
  
  inline Atomic64 Release_Load(volatile const Atomic64 *ptr) {
    __tsan_atomic_thread_fence(__tsan_memory_order_seq_cst);
    return __tsan_atomic64_load(ptr, __tsan_memory_order_relaxed);
  }
  
  inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64 *ptr,
                                      Atomic64 old_value,
                                      Atomic64 new_value) {
    Atomic64 cmp = old_value;
    __tsan_atomic64_compare_exchange_strong(ptr, &cmp, new_value,
        __tsan_memory_order_acquire, __tsan_memory_order_acquire);
    return cmp;
  }
  
  inline Atomic64 Release_CompareAndSwap(volatile Atomic64 *ptr,
                                      Atomic64 old_value,
                                      Atomic64 new_value) {
    Atomic64 cmp = old_value;
    __tsan_atomic64_compare_exchange_strong(ptr, &cmp, new_value,
        __tsan_memory_order_release, __tsan_memory_order_relaxed);
    return cmp;
  }
  
  inline void MemoryBarrier() {
    __tsan_atomic_thread_fence(__tsan_memory_order_seq_cst);
  }
  
  }  // namespace base::subtle
  }  // namespace base
  
  #undef ATOMICOPS_COMPILER_BARRIER
  
  #endif  // BASE_ATOMICOPS_INTERNALS_TSAN_H_
  