v8/src/base/atomicops_internals_atomicword_compat.h

// Copyright 2014 the V8 project 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, use atomicops.h instead.

#ifndef V8_BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
#define V8_BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_

// AtomicWord is a synonym for intptr_t, and Atomic32 is a synonym for int32,
// which in turn means int. On some LP32 platforms, intptr_t is an int, but
// on others, it's a long. When AtomicWord and Atomic32 are based on different
// fundamental types, their pointers are incompatible.
//
// This file defines function overloads to allow both AtomicWord and Atomic32
// data to be used with this interface.
//
// On LP64 platforms, AtomicWord and Atomic64 are both always long,
// so this problem doesn't occur.

#if !defined(V8_HOST_ARCH_64_BIT)

namespace v8 {
namespace base {

inline AtomicWord Relaxed_CompareAndSwap(volatile AtomicWord* ptr,
                                         AtomicWord old_value,
                                         AtomicWord new_value) {
  return Relaxed_CompareAndSwap(reinterpret_cast<volatile Atomic32*>(ptr),
                                old_value, new_value);
}

inline AtomicWord Relaxed_AtomicExchange(volatile AtomicWord* ptr,
                                         AtomicWord new_value) {
  return Relaxed_AtomicExchange(reinterpret_cast<volatile Atomic32*>(ptr),
                                new_value);
}

inline AtomicWord Relaxed_AtomicIncrement(volatile AtomicWord* ptr,
                                          AtomicWord increment) {
  return Relaxed_AtomicIncrement(reinterpret_cast<volatile Atomic32*>(ptr),
                                 increment);
}

inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr,
                                         AtomicWord old_value,
                                         AtomicWord new_value) {
  return v8::base::Acquire_CompareAndSwap(
      reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
}

inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr,
                                         AtomicWord old_value,
                                         AtomicWord new_value) {
  return v8::base::Release_CompareAndSwap(
      reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
}

inline AtomicWord AcquireRelease_CompareAndSwap(volatile AtomicWord* ptr,
                                                AtomicWord old_value,
                                                AtomicWord new_value) {
  return v8::base::AcquireRelease_CompareAndSwap(
      reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
}

inline void Relaxed_Store(volatile AtomicWord* ptr, AtomicWord value) {
  Relaxed_Store(reinterpret_cast<volatile Atomic32*>(ptr), value);
}

inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) {
  return v8::base::Release_Store(
      reinterpret_cast<volatile Atomic32*>(ptr), value);
}

inline AtomicWord Relaxed_Load(volatile const AtomicWord* ptr) {
  return Relaxed_Load(reinterpret_cast<volatile const Atomic32*>(ptr));
}

inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) {
  return v8::base::Acquire_Load(
      reinterpret_cast<volatile const Atomic32*>(ptr));
}

}  // namespace base
}  // namespace v8

#endif  // !defined(V8_HOST_ARCH_64_BIT)

#endif  // V8_BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_