1// Copyright 2014 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5// This file is an internal atomic implementation, use atomicops.h instead.
6
7#ifndef V8_BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
8#define V8_BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
9
10// AtomicWord is a synonym for intptr_t, and Atomic32 is a synonym for int32,
11// which in turn means int. On some LP32 platforms, intptr_t is an int, but
12// on others, it's a long. When AtomicWord and Atomic32 are based on different
13// fundamental types, their pointers are incompatible.
14//
15// This file defines function overloads to allow both AtomicWord and Atomic32
16// data to be used with this interface.
17//
18// On LP64 platforms, AtomicWord and Atomic64 are both always long,
19// so this problem doesn't occur.
20
21#if !defined(V8_HOST_ARCH_64_BIT)
22
23namespace v8 {
24namespace base {
25
26inline AtomicWord NoBarrier_CompareAndSwap(volatile AtomicWord* ptr,
27                                           AtomicWord old_value,
28                                           AtomicWord new_value) {
29  return NoBarrier_CompareAndSwap(
30      reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
31}
32
33inline AtomicWord NoBarrier_AtomicExchange(volatile AtomicWord* ptr,
34                                           AtomicWord new_value) {
35  return NoBarrier_AtomicExchange(
36      reinterpret_cast<volatile Atomic32*>(ptr), new_value);
37}
38
39inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr,
40                                            AtomicWord increment) {
41  return NoBarrier_AtomicIncrement(
42      reinterpret_cast<volatile Atomic32*>(ptr), increment);
43}
44
45inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr,
46                                          AtomicWord increment) {
47  return Barrier_AtomicIncrement(
48      reinterpret_cast<volatile Atomic32*>(ptr), increment);
49}
50
51inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr,
52                                         AtomicWord old_value,
53                                         AtomicWord new_value) {
54  return v8::base::Acquire_CompareAndSwap(
55      reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
56}
57
58inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr,
59                                         AtomicWord old_value,
60                                         AtomicWord new_value) {
61  return v8::base::Release_CompareAndSwap(
62      reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
63}
64
65inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) {
66  NoBarrier_Store(
67      reinterpret_cast<volatile Atomic32*>(ptr), value);
68}
69
70inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) {
71  return v8::base::Acquire_Store(
72      reinterpret_cast<volatile Atomic32*>(ptr), value);
73}
74
75inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) {
76  return v8::base::Release_Store(
77      reinterpret_cast<volatile Atomic32*>(ptr), value);
78}
79
80inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) {
81  return NoBarrier_Load(
82      reinterpret_cast<volatile const Atomic32*>(ptr));
83}
84
85inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) {
86  return v8::base::Acquire_Load(
87      reinterpret_cast<volatile const Atomic32*>(ptr));
88}
89
90inline AtomicWord Release_Load(volatile const AtomicWord* ptr) {
91  return v8::base::Release_Load(
92      reinterpret_cast<volatile const Atomic32*>(ptr));
93}
94
95} }  // namespace v8::base
96
97#endif  // !defined(V8_HOST_ARCH_64_BIT)
98
99#endif  // V8_BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
100