1 /*
2 * Copyright (c) 1999, 2005, 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.
22 *
23 */
24
25 // The following alternative implementations are needed because
26 // Windows 95 doesn't support (some of) the corresponding Windows NT
27 // calls. Furthermore, these versions allow inlining in the caller.
28 // (More precisely: The documentation for InterlockedExchange says
29 // it is supported for Windows 95. However, when single-stepping
30 // through the assembly code we cannot step into the routine and
31 // when looking at the routine address we see only garbage code.
32 // Better safe then sorry!). Was bug 7/31/98 (gri).
33 //
34 // Performance note: On uniprocessors, the 'lock' prefixes are not
35 // necessary (and expensive). We should generate separate cases if
36 // this becomes a performance problem.
37
38 #pragma warning(disable: 4035) // Disables warnings reporting missing return statement
39
40 inline void Atomic::store (jbyte store_value, jbyte* dest) { *dest = store_value; }
41 inline void Atomic::store (jshort store_value, jshort* dest) { *dest = store_value; }
42 inline void Atomic::store (jint store_value, jint* dest) { *dest = store_value; }
43
44 inline void Atomic::store_ptr(intptr_t store_value, intptr_t* dest) { *dest = store_value; }
45 inline void Atomic::store_ptr(void* store_value, void* dest) { *(void**)dest = store_value; }
46
47 inline void Atomic::store (jbyte store_value, volatile jbyte* dest) { *dest = store_value; }
48 inline void Atomic::store (jshort store_value, volatile jshort* dest) { *dest = store_value; }
49 inline void Atomic::store (jint store_value, volatile jint* dest) { *dest = store_value; }
50
51
52 inline void Atomic::store_ptr(intptr_t store_value, volatile intptr_t* dest) { *dest = store_value; }
53 inline void Atomic::store_ptr(void* store_value, volatile void* dest) { *(void* volatile *)dest = store_value; }
54
55 // Adding a lock prefix to an instruction on MP machine
56 // VC++ doesn't like the lock prefix to be on a single line
57 // so we can't insert a label after the lock prefix.
58 // By emitting a lock prefix, we can define a label after it.
59 #define LOCK_IF_MP(mp) __asm cmp mp, 0 \
60 __asm je L0 \
61 __asm _emit 0xF0 \
62 __asm L0:
63
64 #ifdef AMD64
65 inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
66 inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
67
68 inline jint Atomic::add (jint add_value, volatile jint* dest) {
69 return (jint)(*os::atomic_add_func)(add_value, dest);
70 }
71
72 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
73 return (intptr_t)(*os::atomic_add_ptr_func)(add_value, dest);
74 }
75
76 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
77 return (void*)(*os::atomic_add_ptr_func)(add_value, (volatile intptr_t*)dest);
78 }
79
80 inline void Atomic::inc (volatile jint* dest) {
81 (void)add (1, dest);
82 }
83
84 inline void Atomic::inc_ptr(volatile intptr_t* dest) {
85 (void)add_ptr(1, dest);
86 }
87
88 inline void Atomic::inc_ptr(volatile void* dest) {
89 (void)add_ptr(1, dest);
90 }
91
92 inline void Atomic::dec (volatile jint* dest) {
93 (void)add (-1, dest);
94 }
95
96 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
97 (void)add_ptr(-1, dest);
98 }
99
100 inline void Atomic::dec_ptr(volatile void* dest) {
101 (void)add_ptr(-1, dest);
102 }
103
104 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
105 return (jint)(*os::atomic_xchg_func)(exchange_value, dest);
106 }
107
108 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
109 return (intptr_t)(os::atomic_xchg_ptr_func)(exchange_value, dest);
110 }
111
112 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
113 return (void *)(os::atomic_xchg_ptr_func)((intptr_t)exchange_value, (volatile intptr_t*)dest);
114 }
115
116 inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value) {
117 return (*os::atomic_cmpxchg_func)(exchange_value, dest, compare_value);
118 }
119
120 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) {
121 return (*os::atomic_cmpxchg_long_func)(exchange_value, dest, compare_value);
122 }
123
124 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
125 return (intptr_t)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);
126 }
127
128 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
129 return (void*)cmpxchg((jlong)exchange_value, (volatile jlong*)dest, (jlong)compare_value);
130 }
131
132 #else // !AMD64
133
134 //inline void Atomic::store (jlong store_value, jlong* dest) { *dest = store_value; }
135 //inline void Atomic::store (jlong store_value, volatile jlong* dest) { *dest = store_value; }
136 inline jint Atomic::add (jint add_value, volatile jint* dest) {
137 int mp = os::is_MP();
138 __asm {
139 mov edx, dest;
140 mov eax, add_value;
141 mov ecx, eax;
142 LOCK_IF_MP(mp)
143 xadd dword ptr [edx], eax;
144 add eax, ecx;
145 }
146 }
147
148 inline intptr_t Atomic::add_ptr(intptr_t add_value, volatile intptr_t* dest) {
149 return (intptr_t)add((jint)add_value, (volatile jint*)dest);
150 }
151
152 inline void* Atomic::add_ptr(intptr_t add_value, volatile void* dest) {
153 return (void*)add((jint)add_value, (volatile jint*)dest);
154 }
155
156 inline void Atomic::inc (volatile jint* dest) {
157 // alternative for InterlockedIncrement
158 int mp = os::is_MP();
159 __asm {
160 mov edx, dest;
161 LOCK_IF_MP(mp)
162 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 int mp = os::is_MP();
177 __asm {
178 mov edx, dest;
179 LOCK_IF_MP(mp)
180 sub dword ptr [edx], 1;
181 }
182 }
183
184 inline void Atomic::dec_ptr(volatile intptr_t* dest) {
185 dec((volatile jint*)dest);
186 }
187
188 inline void Atomic::dec_ptr(volatile void* dest) {
189 dec((volatile jint*)dest);
190 }
191
192 inline jint Atomic::xchg (jint exchange_value, volatile jint* dest) {
193 // alternative for InterlockedExchange
194 __asm {
195 mov eax, exchange_value;
196 mov ecx, dest;
197 xchg eax, dword ptr [ecx];
198 }
199 }
200
201 inline intptr_t Atomic::xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest) {
202 return (intptr_t)xchg((jint)exchange_value, (volatile jint*)dest);
203 }
204
205 inline void* Atomic::xchg_ptr(void* exchange_value, volatile void* dest) {
206 return (void*)xchg((jint)exchange_value, (volatile jint*)dest);
207 }
208
209 inline jint Atomic::cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value) {
210 // alternative for InterlockedCompareExchange
211 int mp = os::is_MP();
212 __asm {
213 mov edx, dest
214 mov ecx, exchange_value
215 mov eax, compare_value
216 LOCK_IF_MP(mp)
217 cmpxchg dword ptr [edx], ecx
218 }
219 }
220
221 inline jlong Atomic::cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value) {
222 int mp = os::is_MP();
223 jint ex_lo = (jint)exchange_value;
224 jint ex_hi = *( ((jint*)&exchange_value) + 1 );
225 jint cmp_lo = (jint)compare_value;
226 jint cmp_hi = *( ((jint*)&compare_value) + 1 );
227 __asm {
228 push ebx
229 push edi
230 mov eax, cmp_lo
231 mov edx, cmp_hi
232 mov edi, dest
233 mov ebx, ex_lo
234 mov ecx, ex_hi
235 LOCK_IF_MP(mp)
236 cmpxchg8b qword ptr [edi]
237 pop edi
238 pop ebx
239 }
240 }
241
242 inline intptr_t Atomic::cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value) {
243 return (intptr_t)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
244 }
245
246 inline void* Atomic::cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value) {
247 return (void*)cmpxchg((jint)exchange_value, (volatile jint*)dest, (jint)compare_value);
248 }
249 #endif // AMD64
250
251 #pragma warning(default: 4035) // Enables warnings reporting missing return statement