1//===-- sanitizer_atomic_msvc.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// Not intended for direct inclusion. Include sanitizer_atomic.h.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef SANITIZER_ATOMIC_MSVC_H
15#define SANITIZER_ATOMIC_MSVC_H
16
17extern "C" void _ReadWriteBarrier();
18#pragma intrinsic(_ReadWriteBarrier)
19extern "C" void _mm_mfence();
20#pragma intrinsic(_mm_mfence)
21extern "C" void _mm_pause();
22#pragma intrinsic(_mm_pause)
23extern "C" char _InterlockedExchange8(char volatile *Addend, char Value);
24#pragma intrinsic(_InterlockedExchange8)
25extern "C" short _InterlockedExchange16(short volatile *Addend, short Value);
26#pragma intrinsic(_InterlockedExchange16)
27extern "C" long _InterlockedExchange(long volatile *Addend, long Value);
28#pragma intrinsic(_InterlockedExchange)
29extern "C" long _InterlockedExchangeAdd(long volatile *Addend, long Value);
30#pragma intrinsic(_InterlockedExchangeAdd)
31extern "C" char _InterlockedCompareExchange8(char volatile *Destination,
32 char Exchange, char Comparand);
33#pragma intrinsic(_InterlockedCompareExchange8)
34extern "C" short _InterlockedCompareExchange16(short volatile *Destination,
35 short Exchange, short Comparand);
36#pragma intrinsic(_InterlockedCompareExchange16)
37extern "C" long long _InterlockedCompareExchange64(
38 long long volatile *Destination, long long Exchange, long long Comparand);
39#pragma intrinsic(_InterlockedCompareExchange64)
40extern "C" void *_InterlockedCompareExchangePointer(
41 void *volatile *Destination,
42 void *Exchange, void *Comparand);
43#pragma intrinsic(_InterlockedCompareExchangePointer)
44extern "C" long __cdecl _InterlockedCompareExchange(long volatile *Destination,
45 long Exchange,
46 long Comparand);
47#pragma intrinsic(_InterlockedCompareExchange)
48
49#ifdef _WIN64
50extern "C" long long _InterlockedExchangeAdd64(long long volatile *Addend,
51 long long Value);
52#pragma intrinsic(_InterlockedExchangeAdd64)
53#endif
54
55namespace __sanitizer {
56
57inline void atomic_signal_fence(memory_order) {
58 _ReadWriteBarrier();
59}
60
61inline void atomic_thread_fence(memory_order) {
62 _mm_mfence();
63}
64
65inline void proc_yield(int cnt) {
66 for (int i = 0; i < cnt; i++)
67 _mm_pause();
68}
69
70template<typename T>
71inline typename T::Type atomic_load(
72 const volatile T *a, memory_order mo) {
73 DCHECK(mo == memory_order_relaxed || mo == memory_order_consume ||
74 mo == memory_order_acquire || mo == memory_order_seq_cst);
75 DCHECK(!((uptr)a % sizeof(*a)));
76 typename T::Type v;
77 // FIXME(dvyukov): 64-bit load is not atomic on 32-bits.
78 if (mo == memory_order_relaxed) {
79 v = a->val_dont_use;
80 } else {
81 atomic_signal_fence(memory_order_seq_cst);
82 v = a->val_dont_use;
83 atomic_signal_fence(memory_order_seq_cst);
84 }
85 return v;
86}
87
88template<typename T>
89inline void atomic_store(volatile T *a, typename T::Type v, memory_order mo) {
90 DCHECK(mo == memory_order_relaxed || mo == memory_order_release ||
91 mo == memory_order_seq_cst);
92 DCHECK(!((uptr)a % sizeof(*a)));
93 // FIXME(dvyukov): 64-bit store is not atomic on 32-bits.
94 if (mo == memory_order_relaxed) {
95 a->val_dont_use = v;
96 } else {
97 atomic_signal_fence(memory_order_seq_cst);
98 a->val_dont_use = v;
99 atomic_signal_fence(memory_order_seq_cst);
100 }
101 if (mo == memory_order_seq_cst)
102 atomic_thread_fence(memory_order_seq_cst);
103}
104
105inline u32 atomic_fetch_add(volatile atomic_uint32_t *a,
106 u32 v, memory_order mo) {
107 (void)mo;
108 DCHECK(!((uptr)a % sizeof(*a)));
109 return (u32)_InterlockedExchangeAdd((volatile long *)&a->val_dont_use,
110 (long)v);
111}
112
113inline uptr atomic_fetch_add(volatile atomic_uintptr_t *a,
114 uptr v, memory_order mo) {
115 (void)mo;
116 DCHECK(!((uptr)a % sizeof(*a)));
117#ifdef _WIN64
118 return (uptr)_InterlockedExchangeAdd64((volatile long long *)&a->val_dont_use,
119 (long long)v);
120#else
121 return (uptr)_InterlockedExchangeAdd((volatile long *)&a->val_dont_use,
122 (long)v);
123#endif
124}
125
126inline u32 atomic_fetch_sub(volatile atomic_uint32_t *a,
127 u32 v, memory_order mo) {
128 (void)mo;
129 DCHECK(!((uptr)a % sizeof(*a)));
130 return (u32)_InterlockedExchangeAdd((volatile long *)&a->val_dont_use,
131 -(long)v);
132}
133
134inline uptr atomic_fetch_sub(volatile atomic_uintptr_t *a,
135 uptr v, memory_order mo) {
136 (void)mo;
137 DCHECK(!((uptr)a % sizeof(*a)));
138#ifdef _WIN64
139 return (uptr)_InterlockedExchangeAdd64((volatile long long *)&a->val_dont_use,
140 -(long long)v);
141#else
142 return (uptr)_InterlockedExchangeAdd((volatile long *)&a->val_dont_use,
143 -(long)v);
144#endif
145}
146
147inline u8 atomic_exchange(volatile atomic_uint8_t *a,
148 u8 v, memory_order mo) {
149 (void)mo;
150 DCHECK(!((uptr)a % sizeof(*a)));
151 return (u8)_InterlockedExchange8((volatile char*)&a->val_dont_use, v);
152}
153
154inline u16 atomic_exchange(volatile atomic_uint16_t *a,
155 u16 v, memory_order mo) {
156 (void)mo;
157 DCHECK(!((uptr)a % sizeof(*a)));
158 return (u16)_InterlockedExchange16((volatile short*)&a->val_dont_use, v);
159}
160
161inline u32 atomic_exchange(volatile atomic_uint32_t *a,
162 u32 v, memory_order mo) {
163 (void)mo;
164 DCHECK(!((uptr)a % sizeof(*a)));
165 return (u32)_InterlockedExchange((volatile long*)&a->val_dont_use, v);
166}
167
168inline bool atomic_compare_exchange_strong(volatile atomic_uint8_t *a,
169 u8 *cmp,
170 u8 xchgv,
171 memory_order mo) {
172 (void)mo;
173 DCHECK(!((uptr)a % sizeof(*a)));
174 u8 cmpv = *cmp;
175#ifdef _WIN64
176 u8 prev = (u8)_InterlockedCompareExchange8(
177 (volatile char*)&a->val_dont_use, (char)xchgv, (char)cmpv);
178#else
179 u8 prev;
180 __asm {
181 mov al, cmpv
182 mov ecx, a
183 mov dl, xchgv
184 lock cmpxchg [ecx], dl
185 mov prev, al
186 }
187#endif
188 if (prev == cmpv)
189 return true;
190 *cmp = prev;
191 return false;
192}
193
194inline bool atomic_compare_exchange_strong(volatile atomic_uintptr_t *a,
195 uptr *cmp,
196 uptr xchg,
197 memory_order mo) {
198 uptr cmpv = *cmp;
199 uptr prev = (uptr)_InterlockedCompareExchangePointer(
200 (void*volatile*)&a->val_dont_use, (void*)xchg, (void*)cmpv);
201 if (prev == cmpv)
202 return true;
203 *cmp = prev;
204 return false;
205}
206
207inline bool atomic_compare_exchange_strong(volatile atomic_uint16_t *a,
208 u16 *cmp,
209 u16 xchg,
210 memory_order mo) {
211 u16 cmpv = *cmp;
212 u16 prev = (u16)_InterlockedCompareExchange16(
213 (volatile short*)&a->val_dont_use, (short)xchg, (short)cmpv);
214 if (prev == cmpv)
215 return true;
216 *cmp = prev;
217 return false;
218}
219
220inline bool atomic_compare_exchange_strong(volatile atomic_uint32_t *a,
221 u32 *cmp,
222 u32 xchg,
223 memory_order mo) {
224 u32 cmpv = *cmp;
225 u32 prev = (u32)_InterlockedCompareExchange(
226 (volatile long*)&a->val_dont_use, (long)xchg, (long)cmpv);
227 if (prev == cmpv)
228 return true;
229 *cmp = prev;
230 return false;
231}
232
233inline bool atomic_compare_exchange_strong(volatile atomic_uint64_t *a,
234 u64 *cmp,
235 u64 xchg,
236 memory_order mo) {
237 u64 cmpv = *cmp;
238 u64 prev = (u64)_InterlockedCompareExchange64(
239 (volatile long long*)&a->val_dont_use, (long long)xchg, (long long)cmpv);
240 if (prev == cmpv)
241 return true;
242 *cmp = prev;
243 return false;
244}
245
246template<typename T>
247inline bool atomic_compare_exchange_weak(volatile T *a,
248 typename T::Type *cmp,
249 typename T::Type xchg,
250 memory_order mo) {
251 return atomic_compare_exchange_strong(a, cmp, xchg, mo);
252}
253
254} // namespace __sanitizer
255
256#endif // SANITIZER_ATOMIC_CLANG_H