1 //===-- sanitizer_atomic.h --------------------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file is a part of ThreadSanitizer/AddressSanitizer runtime.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef SANITIZER_ATOMIC_H
14 #define SANITIZER_ATOMIC_H
15 
16 #include "sanitizer_internal_defs.h"
17 
18 namespace __sanitizer {
19 
20 enum memory_order {
21   memory_order_relaxed = 1 << 0,
22   memory_order_consume = 1 << 1,
23   memory_order_acquire = 1 << 2,
24   memory_order_release = 1 << 3,
25   memory_order_acq_rel = 1 << 4,
26   memory_order_seq_cst = 1 << 5
27 };
28 
29 struct atomic_uint8_t {
30   typedef u8 Type;
31   volatile Type val_dont_use;
32 };
33 
34 struct atomic_uint16_t {
35   typedef u16 Type;
36   volatile Type val_dont_use;
37 };
38 
39 struct atomic_sint32_t {
40   typedef s32 Type;
41   volatile Type val_dont_use;
42 };
43 
44 struct atomic_uint32_t {
45   typedef u32 Type;
46   volatile Type val_dont_use;
47 };
48 
49 struct atomic_uint64_t {
50   typedef u64 Type;
51   // On 32-bit platforms u64 is not necessary aligned on 8 bytes.
52   volatile ALIGNED(8) Type val_dont_use;
53 };
54 
55 struct atomic_uintptr_t {
56   typedef uptr Type;
57   volatile Type val_dont_use;
58 };
59 
60 }  // namespace __sanitizer
61 
62 #if defined(__clang__) || defined(__GNUC__)
63 # include "sanitizer_atomic_clang.h"
64 #elif defined(_MSC_VER)
65 # include "sanitizer_atomic_msvc.h"
66 #else
67 # error "Unsupported compiler"
68 #endif
69 
70 namespace __sanitizer {
71 
72 // Clutter-reducing helpers.
73 
74 template<typename T>
atomic_load_relaxed(const volatile T * a)75 inline typename T::Type atomic_load_relaxed(const volatile T *a) {
76   return atomic_load(a, memory_order_relaxed);
77 }
78 
79 template<typename T>
atomic_store_relaxed(volatile T * a,typename T::Type v)80 inline void atomic_store_relaxed(volatile T *a, typename T::Type v) {
81   atomic_store(a, v, memory_order_relaxed);
82 }
83 
84 }  // namespace __sanitizer
85 
86 #endif  // SANITIZER_ATOMIC_H
87