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 #ifdef AMD64
69 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
70 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
71
72 template<>
73 template<typename I, typename D>
74 inline D Atomic::PlatformAdd<4>::add_and_fetch(I add_value, D volatile* dest) const {
75 return add_using_helper<jint>(os::atomic_add_func, add_value, dest);
76 }
77
78 template<>
79 template<typename I, typename D>
80 inline D Atomic::PlatformAdd<8>::add_and_fetch(I add_value, D volatile* dest) const {
81 return add_using_helper<intptr_t>(os::atomic_add_ptr_func, add_value, dest);
82 }
83
84 inline void Atomic::inc (volatile jint* dest) {
85 (void)add (1, dest);
86 }
87
88 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
89 (void)add_ptr(1, dest);
90 }
91
92 inline void Atomic::inc_ptr(volatile void* dest) {
93 (void)add_ptr(1, dest);
94 }
95
96 inline void Atomic::dec (volatile jint* dest) {
97 (void)add (-1, dest);
98 }
99
100 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
101 (void)add_ptr(-1, dest);
102 }
103
104 inline void Atomic::dec_ptr(volatile void* dest) {
105 (void)add_ptr(-1, dest);
106 }
107
108 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
109 return (jint)(*os::atomic_xchg_func)(exchange_value, dest);
110 }
111
112 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
113 return (intptr_t)(os::atomic_xchg_ptr_func)(exchange_value, dest);
114 }
115
116 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
117 return (void *)(os::atomic_xchg_ptr_func)((intptr_t)exchange_value, (volatile intptr_t*)dest);
118 }
119
120 #define DEFINE_STUB_CMPXCHG(ByteSize, StubType, StubName) \
121 template<> \
122 template<typename T> \
123 inline T Atomic::PlatformCmpxchg<ByteSize>::operator()(T exchange_value, \
124 T volatile* dest, \
125 T compare_value, \
126 cmpxchg_memory_order order) const { \
127 STATIC_ASSERT(ByteSize == sizeof(T)); \
128 return cmpxchg_using_helper<StubType>(StubName, exchange_value, dest, compare_value); \
129 }
130
131 DEFINE_STUB_CMPXCHG(1, jbyte, os::atomic_cmpxchg_byte_func)
132 DEFINE_STUB_CMPXCHG(4, jint, os::atomic_cmpxchg_func)
133 DEFINE_STUB_CMPXCHG(8, jlong, os::atomic_cmpxchg_long_func)
134
135 #undef DEFINE_STUB_CMPXCHG
136
137 inline jlong Atomic::load(const volatile jlong* src) { return *src; }
138
139 #else // !AMD64
140
141 template<>
142 template<typename I, typename D>
143 inline D Atomic::PlatformAdd<4>::add_and_fetch(I add_value, D volatile* dest) const {
144 STATIC_ASSERT(4 == sizeof(I));
145 STATIC_ASSERT(4 == sizeof(D));
146 __asm {
147 mov edx, dest;
148 mov eax, add_value;
149 mov ecx, eax;
150 lock xadd dword ptr [edx], eax;
151 add eax, ecx;
152 }
153 }
154
155 inline void Atomic::inc (volatile jint* dest) {
156 // alternative for InterlockedIncrement
157 __asm {
158 mov edx, dest;
159 lock add dword ptr [edx], 1;
160 }
161 }
162
163 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
164 inc((volatile jint*)dest);
165 }
166
167 inline void Atomic::inc_ptr(volatile void* dest) {
168 inc((volatile jint*)dest);
169 }
170
171 inline void Atomic::dec (volatile jint* dest) {
172 // alternative for InterlockedDecrement
173 __asm {
174 mov edx, dest;
175 lock sub dword ptr [edx], 1;
176 }
177 }
178
179 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
180 dec((volatile jint*)dest);
181 }
182
183 inline void Atomic::dec_ptr(volatile void* dest) {
184 dec((volatile jint*)dest);
185 }
186
187 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
188 // alternative for InterlockedExchange
189 __asm {
190 mov eax, exchange_value;
191 mov ecx, dest;
192 xchg eax, dword ptr [ecx];
193 }
194 }
195
196 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
197 return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
198 }
199
200 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
201 return (void*)xchg((jint)exchange_value, (volatile jint*)dest);
202 }
203
204 template<>
205 template<typename T>
206 inline T Atomic::PlatformCmpxchg<1>::operator()(T exchange_value,
207 T volatile* dest,
208 T compare_value,
209 cmpxchg_memory_order order) const {
210 STATIC_ASSERT(1 == sizeof(T));
211 // alternative for InterlockedCompareExchange
212 __asm {
213 mov edx, dest
214 mov cl, exchange_value
215 mov al, compare_value
216 lock cmpxchg byte ptr [edx], cl
217 }
218 }
219
220 template<>
221 template<typename T>
222 inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value,
223 T volatile* dest,
224 T compare_value,
225 cmpxchg_memory_order order) const {
226 STATIC_ASSERT(4 == sizeof(T));
227 // alternative for InterlockedCompareExchange
228 __asm {
229 mov edx, dest
230 mov ecx, exchange_value
231 mov eax, compare_value
232 lock cmpxchg dword ptr [edx], ecx
233 }
234 }
235
236 template<>
237 template<typename T>
238 inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value,
239 T volatile* dest,
240 T compare_value,
241 cmpxchg_memory_order order) const {
242 STATIC_ASSERT(8 == sizeof(T));
243 jint ex_lo = (jint)exchange_value;
244 jint ex_hi = *( ((jint*)&exchange_value) + 1 );
245 jint cmp_lo = (jint)compare_value;
246 jint cmp_hi = *( ((jint*)&compare_value) + 1 );
247 __asm {
248 push ebx
249 push edi
250 mov eax, cmp_lo
251 mov edx, cmp_hi
252 mov edi, dest
253 mov ebx, ex_lo
254 mov ecx, ex_hi
255 lock cmpxchg8b qword ptr [edi]
256 pop edi
257 pop ebx
258 }
259 }
260
261 inline jlong Atomic::load(const volatile jlong* src) {
262 volatile jlong dest;
263 volatile jlong* pdest = &dest;
264 __asm {
265 mov eax, src
266 fild qword ptr [eax]
267 mov eax, pdest
268 fistp qword ptr [eax]
269 }
270 return dest;
271 }
272
273 inline void Atomic::store(jlong store_value, volatile jlong* dest) {
274 volatile jlong* src = &store_value;
275 __asm {
276 mov eax, src
277 fild qword ptr [eax]
278 mov eax, dest
279 fistp qword ptr [eax]
280 }
281 }
282
283 inline void Atomic::store(jlong store_value, jlong* dest) {
284 Atomic::store(store_value, (volatile jlong*)dest);
285 }
286
287 #endif // AMD64
288
289 #pragma warning(default: 4035) // Enables warnings reporting missing return statement
290
291 #endif // OS_CPU_WINDOWS_X86_VM_ATOMIC_WINDOWS_X86_HPP