cef/include/base/internal/cef_atomicops_arm64_msvc.h

// Copyright (c) 2008 Google Inc. All rights reserved.
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//
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// Framework nor the names of its contributors may be used to endorse
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// Do not include this header file directly. Use base/cef_atomicops.h
// instead.

#ifndef CEF_INCLUDE_BASE_INTERNAL_CEF_ATOMICOPS_ARM64_MSVC_H_
#define CEF_INCLUDE_BASE_INTERNAL_CEF_ATOMICOPS_ARM64_MSVC_H_

#include <windows.h>

#include <intrin.h>

#include "include/base/cef_macros.h"

namespace base {
namespace subtle {

inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
                                         Atomic32 old_value,
                                         Atomic32 new_value) {
  LONG result = _InterlockedCompareExchange(
      reinterpret_cast<volatile LONG*>(ptr), static_cast<LONG>(new_value),
      static_cast<LONG>(old_value));
  return static_cast<Atomic32>(result);
}

inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
                                         Atomic32 new_value) {
  LONG result = _InterlockedExchange(reinterpret_cast<volatile LONG*>(ptr),
                                     static_cast<LONG>(new_value));
  return static_cast<Atomic32>(result);
}

inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
                                        Atomic32 increment) {
  return _InterlockedExchangeAdd(reinterpret_cast<volatile LONG*>(ptr),
                                 static_cast<LONG>(increment)) +
         increment;
}

inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
                                          Atomic32 increment) {
  return Barrier_AtomicIncrement(ptr, increment);
}

#if !(defined(_MSC_VER) && _MSC_VER >= 1400)
#error "We require at least vs2005 for MemoryBarrier"
#endif

inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
                                       Atomic32 old_value,
                                       Atomic32 new_value) {
  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
}

inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
                                       Atomic32 old_value,
                                       Atomic32 new_value) {
  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
}

inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
  *ptr = value;
}

inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
  NoBarrier_AtomicExchange(ptr, value);
  // acts as a barrier in this implementation
}

inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
  *ptr = value;
  // See comments in Atomic64 version of Release_Store() below.
}

inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
  return *ptr;
}

inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
  Atomic32 value = *ptr;
  return value;
}

inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
  MemoryBarrier();
  return *ptr;
}

#if defined(_WIN64)

// 64-bit low-level operations on 64-bit platform.

COMPILE_ASSERT(sizeof(Atomic64) == sizeof(PVOID), atomic_word_is_atomic);

inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
                                         Atomic64 old_value,
                                         Atomic64 new_value) {
  PVOID result = InterlockedCompareExchangePointer(
      reinterpret_cast<volatile PVOID*>(ptr),
      reinterpret_cast<PVOID>(new_value), reinterpret_cast<PVOID>(old_value));
  return reinterpret_cast<Atomic64>(result);
}

inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
                                         Atomic64 new_value) {
  PVOID result =
      InterlockedExchangePointer(reinterpret_cast<volatile PVOID*>(ptr),
                                 reinterpret_cast<PVOID>(new_value));
  return reinterpret_cast<Atomic64>(result);
}

inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
                                        Atomic64 increment) {
  return InterlockedExchangeAdd64(reinterpret_cast<volatile LONGLONG*>(ptr),
                                  static_cast<LONGLONG>(increment)) +
         increment;
}

inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
                                          Atomic64 increment) {
  return Barrier_AtomicIncrement(ptr, increment);
}

inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
  *ptr = value;
}

inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
  NoBarrier_AtomicExchange(ptr, value);
  // acts as a barrier in this implementation
}

inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
  *ptr = value;
}

inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
  return *ptr;
}

inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
  Atomic64 value = *ptr;
  return value;
}

inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
  MemoryBarrier();
  return *ptr;
}

inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
                                       Atomic64 old_value,
                                       Atomic64 new_value) {
  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
}

inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
                                       Atomic64 old_value,
                                       Atomic64 new_value) {
  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
}

#endif  // defined(_WIN64)

}  // namespace base::subtle
}  // namespace base

#endif  // CEF_INCLUDE_BASE_INTERNAL_CEF_ATOMICOPS_ARM64_MSVC_H_