1 /*
2 * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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23 */
24
25 #ifndef OS_CPU_WINDOWS_X86_VM_ATOMIC_WINDOWS_X86_HPP
26 #define OS_CPU_WINDOWS_X86_VM_ATOMIC_WINDOWS_X86_HPP
27
28 #include "runtime/os.hpp"
29
30 // The following alternative implementations are needed because
31 // Windows 95 doesn't support (some of) the corresponding Windows NT
32 // calls. Furthermore, these versions allow inlining in the caller.
33 // (More precisely: The documentation for InterlockedExchange says
34 // it is supported for Windows 95. However, when single-stepping
35 // through the assembly code we cannot step into the routine and
36 // when looking at the routine address we see only garbage code.
37 // Better safe then sorry!). Was bug 7/31/98 (gri).
38 //
39 // Performance note: On uniprocessors, the 'lock' prefixes are not
40 // necessary (and expensive). We should generate separate cases if
41 // this becomes a performance problem.
42
43 #pragma warning(disable: 4035) // Disables warnings reporting missing return statement
44
45 inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; }
46 inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; }
47 inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; }
48
49 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
50 inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; }
51
52 inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; }
53 inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; }
54 inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; }
55
56
57 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
58 inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; }
59
60 template<size_t byte_size>
61 struct Atomic::PlatformAdd
62 : Atomic::AddAndFetch<Atomic::PlatformAdd<byte_size> >
63 {
64 template<typename I, typename D>
65 D add_and_fetch(I add_value, D volatile* dest) const;
66 };
67
68 template<>
69 struct Atomic::PlatformAdd<2>: Atomic::AddShortUsingInt {};
70
71 #ifdef AMD64
72 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
73 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
74
75 template<>
76 template<typename I, typename D>
77 inline D Atomic::PlatformAdd<4>::add_and_fetch(I add_value, D volatile* dest) const {
78 return add_using_helper<jint>(os::atomic_add_func, add_value, dest);
79 }
80
81 template<>
82 template<typename I, typename D>
83 inline D Atomic::PlatformAdd<8>::add_and_fetch(I add_value, D volatile* dest) const {
84 return add_using_helper<intptr_t>(os::atomic_add_ptr_func, add_value, dest);
85 }
86
87 inline void Atomic::inc (volatile jint* dest) {
88 (void)add (1, dest);
89 }
90
91 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
92 (void)add_ptr(1, dest);
93 }
94
95 inline void Atomic::inc_ptr(volatile void* dest) {
96 (void)add_ptr(1, dest);
97 }
98
99 inline void Atomic::dec (volatile jint* dest) {
100 (void)add (-1, dest);
101 }
102
103 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
104 (void)add_ptr(-1, dest);
105 }
106
107 inline void Atomic::dec_ptr(volatile void* dest) {
108 (void)add_ptr(-1, dest);
109 }
110
111 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
112 return (jint)(*os::atomic_xchg_func)(exchange_value, dest);
113 }
114
115 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
116 return (intptr_t)(os::atomic_xchg_ptr_func)(exchange_value, dest);
117 }
118
119 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
120 return (void *)(os::atomic_xchg_ptr_func)((intptr_t)exchange_value, (volatile intptr_t*)dest);
121 }
122
123 #define DEFINE_STUB_CMPXCHG(ByteSize, StubType, StubName) \
124 template<> \
125 template<typename T> \
126 inline T Atomic::PlatformCmpxchg<ByteSize>::operator()(T exchange_value, \
127 T volatile* dest, \
128 T compare_value, \
129 cmpxchg_memory_order order) const { \
130 STATIC_ASSERT(ByteSize == sizeof(T)); \
131 return cmpxchg_using_helper<StubType>(StubName, exchange_value, dest, compare_value); \
132 }
133
134 DEFINE_STUB_CMPXCHG(1, jbyte, os::atomic_cmpxchg_byte_func)
135 DEFINE_STUB_CMPXCHG(4, jint, os::atomic_cmpxchg_func)
136 DEFINE_STUB_CMPXCHG(8, jlong, os::atomic_cmpxchg_long_func)
137
138 #undef DEFINE_STUB_CMPXCHG
139
140 inline jlong Atomic::load(const volatile jlong* src) { return *src; }
141
142 #else // !AMD64
143
144 template<>
145 template<typename I, typename D>
146 inline D Atomic::PlatformAdd<4>::add_and_fetch(I add_value, D volatile* dest) const {
147 STATIC_ASSERT(4 == sizeof(I));
148 STATIC_ASSERT(4 == sizeof(D));
149 __asm {
150 mov edx, dest;
151 mov eax, add_value;
152 mov ecx, eax;
153 lock xadd dword ptr [edx], eax;
154 add eax, ecx;
155 }
156 }
157
158 inline void Atomic::inc (volatile jint* dest) {
159 // alternative for InterlockedIncrement
160 __asm {
161 mov edx, dest;
162 lock add dword ptr [edx], 1;
163 }
164 }
165
166 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
167 inc((volatile jint*)dest);
168 }
169
170 inline void Atomic::inc_ptr(volatile void* dest) {
171 inc((volatile jint*)dest);
172 }
173
174 inline void Atomic::dec (volatile jint* dest) {
175 // alternative for InterlockedDecrement
176 __asm {
177 mov edx, dest;
178 lock sub dword ptr [edx], 1;
179 }
180 }
181
182 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
183 dec((volatile jint*)dest);
184 }
185
186 inline void Atomic::dec_ptr(volatile void* dest) {
187 dec((volatile jint*)dest);
188 }
189
190 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
191 // alternative for InterlockedExchange
192 __asm {
193 mov eax, exchange_value;
194 mov ecx, dest;
195 xchg eax, dword ptr [ecx];
196 }
197 }
198
199 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
200 return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
201 }
202
203 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
204 return (void*)xchg((jint)exchange_value, (volatile jint*)dest);
205 }
206
207 template<>
208 template<typename T>
209 inline T Atomic::PlatformCmpxchg<1>::operator()(T exchange_value,
210 T volatile* dest,
211 T compare_value,
212 cmpxchg_memory_order order) const {
213 STATIC_ASSERT(1 == sizeof(T));
214 // alternative for InterlockedCompareExchange
215 __asm {
216 mov edx, dest
217 mov cl, exchange_value
218 mov al, compare_value
219 lock cmpxchg byte ptr [edx], cl
220 }
221 }
222
223 template<>
224 template<typename T>
225 inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value,
226 T volatile* dest,
227 T compare_value,
228 cmpxchg_memory_order order) const {
229 STATIC_ASSERT(4 == sizeof(T));
230 // alternative for InterlockedCompareExchange
231 __asm {
232 mov edx, dest
233 mov ecx, exchange_value
234 mov eax, compare_value
235 lock cmpxchg dword ptr [edx], ecx
236 }
237 }
238
239 template<>
240 template<typename T>
241 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,
242 T volatile* dest,
243 T compare_value,
244 cmpxchg_memory_order order) const {
245 STATIC_ASSERT(8 == sizeof(T));
246 jint ex_lo = (jint)exchange_value;
247 jint ex_hi = *( ((jint*)&exchange_value) + 1 );
248 jint cmp_lo = (jint)compare_value;
249 jint cmp_hi = *( ((jint*)&compare_value) + 1 );
250 __asm {
251 push ebx
252 push edi
253 mov eax, cmp_lo
254 mov edx, cmp_hi
255 mov edi, dest
256 mov ebx, ex_lo
257 mov ecx, ex_hi
258 lock cmpxchg8b qword ptr [edi]
259 pop edi
260 pop ebx
261 }
262 }
263
264 inline jlong Atomic::load(const volatile jlong* src) {
265 volatile jlong dest;
266 volatile jlong* pdest = &dest;
267 __asm {
268 mov eax, src
269 fild qword ptr [eax]
270 mov eax, pdest
271 fistp qword ptr [eax]
272 }
273 return dest;
274 }
275
276 inline void Atomic::store(jlong store_value, volatile jlong* dest) {
277 volatile jlong* src = &store_value;
278 __asm {
279 mov eax, src
280 fild qword ptr [eax]
281 mov eax, dest
282 fistp qword ptr [eax]
283 }
284 }
285
286 inline void Atomic::store(jlong store_value, jlong* dest) {
287 Atomic::store(store_value, (volatile jlong*)dest);
288 }
289
290 #endif // AMD64
291
292 #pragma warning(default: 4035) // Enables warnings reporting missing return statement
293
294 #endif // OS_CPU_WINDOWS_X86_VM_ATOMIC_WINDOWS_X86_HPP