/[pcre]/code/trunk/sljit/sljitUtils.c
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Contents of /code/trunk/sljit/sljitUtils.c

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Revision 1757 - (show annotations)
Tue Nov 19 12:54:59 2019 UTC (3 months ago) by zherczeg
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File size: 9541 byte(s)
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JIT compiler update.
1 /*
2 * Stack-less Just-In-Time compiler
3 *
4 * Copyright Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without modification, are
7 * permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright notice, this list of
10 * conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
13 * of conditions and the following disclaimer in the documentation and/or other materials
14 * provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
19 * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
21 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
22 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
24 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 /* ------------------------------------------------------------------------ */
28 /* Locks */
29 /* ------------------------------------------------------------------------ */
30
31 #if (defined SLJIT_EXECUTABLE_ALLOCATOR && SLJIT_EXECUTABLE_ALLOCATOR) || (defined SLJIT_UTIL_GLOBAL_LOCK && SLJIT_UTIL_GLOBAL_LOCK)
32
33 #if (defined SLJIT_SINGLE_THREADED && SLJIT_SINGLE_THREADED)
34
35 #if (defined SLJIT_EXECUTABLE_ALLOCATOR && SLJIT_EXECUTABLE_ALLOCATOR)
36
37 static SLJIT_INLINE void allocator_grab_lock(void)
38 {
39 /* Always successful. */
40 }
41
42 static SLJIT_INLINE void allocator_release_lock(void)
43 {
44 /* Always successful. */
45 }
46
47 #endif /* SLJIT_EXECUTABLE_ALLOCATOR */
48
49 #if (defined SLJIT_UTIL_GLOBAL_LOCK && SLJIT_UTIL_GLOBAL_LOCK)
50
51 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_grab_lock(void)
52 {
53 /* Always successful. */
54 }
55
56 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_release_lock(void)
57 {
58 /* Always successful. */
59 }
60
61 #endif /* SLJIT_UTIL_GLOBAL_LOCK */
62
63 #elif defined(_WIN32) /* SLJIT_SINGLE_THREADED */
64
65 #include "windows.h"
66
67 #if (defined SLJIT_EXECUTABLE_ALLOCATOR && SLJIT_EXECUTABLE_ALLOCATOR)
68
69 static HANDLE allocator_mutex = 0;
70
71 static SLJIT_INLINE void allocator_grab_lock(void)
72 {
73 /* No idea what to do if an error occures. Static mutexes should never fail... */
74 if (!allocator_mutex)
75 allocator_mutex = CreateMutex(NULL, TRUE, NULL);
76 else
77 WaitForSingleObject(allocator_mutex, INFINITE);
78 }
79
80 static SLJIT_INLINE void allocator_release_lock(void)
81 {
82 ReleaseMutex(allocator_mutex);
83 }
84
85 #endif /* SLJIT_EXECUTABLE_ALLOCATOR */
86
87 #if (defined SLJIT_UTIL_GLOBAL_LOCK && SLJIT_UTIL_GLOBAL_LOCK)
88
89 static HANDLE global_mutex = 0;
90
91 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_grab_lock(void)
92 {
93 /* No idea what to do if an error occures. Static mutexes should never fail... */
94 if (!global_mutex)
95 global_mutex = CreateMutex(NULL, TRUE, NULL);
96 else
97 WaitForSingleObject(global_mutex, INFINITE);
98 }
99
100 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_release_lock(void)
101 {
102 ReleaseMutex(global_mutex);
103 }
104
105 #endif /* SLJIT_UTIL_GLOBAL_LOCK */
106
107 #else /* _WIN32 */
108
109 #if (defined SLJIT_EXECUTABLE_ALLOCATOR && SLJIT_EXECUTABLE_ALLOCATOR)
110
111 #include <pthread.h>
112
113 static pthread_mutex_t allocator_mutex = PTHREAD_MUTEX_INITIALIZER;
114
115 static SLJIT_INLINE void allocator_grab_lock(void)
116 {
117 pthread_mutex_lock(&allocator_mutex);
118 }
119
120 static SLJIT_INLINE void allocator_release_lock(void)
121 {
122 pthread_mutex_unlock(&allocator_mutex);
123 }
124
125 #endif /* SLJIT_EXECUTABLE_ALLOCATOR */
126
127 #if (defined SLJIT_UTIL_GLOBAL_LOCK && SLJIT_UTIL_GLOBAL_LOCK)
128
129 #include <pthread.h>
130
131 static pthread_mutex_t global_mutex = PTHREAD_MUTEX_INITIALIZER;
132
133 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_grab_lock(void)
134 {
135 pthread_mutex_lock(&global_mutex);
136 }
137
138 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_release_lock(void)
139 {
140 pthread_mutex_unlock(&global_mutex);
141 }
142
143 #endif /* SLJIT_UTIL_GLOBAL_LOCK */
144
145 #endif /* _WIN32 */
146
147 /* ------------------------------------------------------------------------ */
148 /* Stack */
149 /* ------------------------------------------------------------------------ */
150
151 #if (defined SLJIT_UTIL_STACK && SLJIT_UTIL_STACK) || (defined SLJIT_EXECUTABLE_ALLOCATOR && SLJIT_EXECUTABLE_ALLOCATOR)
152
153 #ifdef _WIN32
154 #include "windows.h"
155 #else
156 /* Provides mmap function. */
157 #include <sys/types.h>
158 #include <sys/mman.h>
159 #ifndef MAP_ANON
160 #ifdef MAP_ANONYMOUS
161 #define MAP_ANON MAP_ANONYMOUS
162 #endif
163 #endif
164 /* For detecting the page size. */
165 #include <unistd.h>
166
167 #ifndef MAP_ANON
168
169 #include <fcntl.h>
170
171 /* Some old systems does not have MAP_ANON. */
172 static sljit_s32 dev_zero = -1;
173
174 #if (defined SLJIT_SINGLE_THREADED && SLJIT_SINGLE_THREADED)
175
176 static SLJIT_INLINE sljit_s32 open_dev_zero(void)
177 {
178 dev_zero = open("/dev/zero", O_RDWR);
179 return dev_zero < 0;
180 }
181
182 #else /* SLJIT_SINGLE_THREADED */
183
184 #include <pthread.h>
185
186 static pthread_mutex_t dev_zero_mutex = PTHREAD_MUTEX_INITIALIZER;
187
188 static SLJIT_INLINE sljit_s32 open_dev_zero(void)
189 {
190 pthread_mutex_lock(&dev_zero_mutex);
191 /* The dev_zero might be initialized by another thread during the waiting. */
192 if (dev_zero < 0) {
193 dev_zero = open("/dev/zero", O_RDWR);
194 }
195 pthread_mutex_unlock(&dev_zero_mutex);
196 return dev_zero < 0;
197 }
198
199 #endif /* SLJIT_SINGLE_THREADED */
200
201 #endif
202
203 #endif
204
205 #endif /* SLJIT_UTIL_STACK || SLJIT_EXECUTABLE_ALLOCATOR */
206
207 #if (defined SLJIT_UTIL_STACK && SLJIT_UTIL_STACK)
208
209 /* Planning to make it even more clever in the future. */
210 static sljit_sw sljit_page_align = 0;
211
212 SLJIT_API_FUNC_ATTRIBUTE struct sljit_stack* SLJIT_FUNC sljit_allocate_stack(sljit_uw start_size, sljit_uw max_size, void *allocator_data)
213 {
214 struct sljit_stack *stack;
215 void *ptr;
216 #ifdef _WIN32
217 SYSTEM_INFO si;
218 #endif
219
220 SLJIT_UNUSED_ARG(allocator_data);
221 if (start_size > max_size || start_size < 1)
222 return NULL;
223
224 #ifdef _WIN32
225 if (!sljit_page_align) {
226 GetSystemInfo(&si);
227 sljit_page_align = si.dwPageSize - 1;
228 }
229 #else
230 if (!sljit_page_align) {
231 sljit_page_align = sysconf(_SC_PAGESIZE);
232 /* Should never happen. */
233 if (sljit_page_align < 0)
234 sljit_page_align = 4096;
235 sljit_page_align--;
236 }
237 #endif
238
239 stack = (struct sljit_stack*)SLJIT_MALLOC(sizeof(struct sljit_stack), allocator_data);
240 if (!stack)
241 return NULL;
242
243 /* Align max_size. */
244 max_size = (max_size + sljit_page_align) & ~sljit_page_align;
245
246 #ifdef _WIN32
247 ptr = VirtualAlloc(NULL, max_size, MEM_RESERVE, PAGE_READWRITE);
248 if (!ptr) {
249 SLJIT_FREE(stack, allocator_data);
250 return NULL;
251 }
252
253 stack->min_start = (sljit_u8 *)ptr;
254 stack->end = stack->min_start + max_size;
255 stack->start = stack->end;
256
257 if (sljit_stack_resize(stack, stack->end - start_size) == NULL) {
258 sljit_free_stack(stack, allocator_data);
259 return NULL;
260 }
261 #else
262 #ifdef MAP_ANON
263 ptr = mmap(NULL, max_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
264 #else
265 if (dev_zero < 0) {
266 if (open_dev_zero()) {
267 SLJIT_FREE(stack, allocator_data);
268 return NULL;
269 }
270 }
271 ptr = mmap(NULL, max_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, dev_zero, 0);
272 #endif
273 if (ptr == MAP_FAILED) {
274 SLJIT_FREE(stack, allocator_data);
275 return NULL;
276 }
277 stack->min_start = (sljit_u8 *)ptr;
278 stack->end = stack->min_start + max_size;
279 stack->start = stack->end - start_size;
280 #endif
281 stack->top = stack->end;
282 return stack;
283 }
284
285 #undef PAGE_ALIGN
286
287 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_free_stack(struct sljit_stack *stack, void *allocator_data)
288 {
289 SLJIT_UNUSED_ARG(allocator_data);
290 #ifdef _WIN32
291 VirtualFree((void*)stack->min_start, 0, MEM_RELEASE);
292 #else
293 munmap((void*)stack->min_start, stack->end - stack->min_start);
294 #endif
295 SLJIT_FREE(stack, allocator_data);
296 }
297
298 SLJIT_API_FUNC_ATTRIBUTE sljit_u8 *SLJIT_FUNC sljit_stack_resize(struct sljit_stack *stack, sljit_u8 *new_start)
299 {
300 sljit_uw aligned_old_start;
301 sljit_uw aligned_new_start;
302
303 if ((new_start < stack->min_start) || (new_start >= stack->end))
304 return NULL;
305
306 #ifdef _WIN32
307 aligned_new_start = (sljit_uw)new_start & ~sljit_page_align;
308 aligned_old_start = ((sljit_uw)stack->start) & ~sljit_page_align;
309 if (aligned_new_start != aligned_old_start) {
310 if (aligned_new_start < aligned_old_start) {
311 if (!VirtualAlloc((void*)aligned_new_start, aligned_old_start - aligned_new_start, MEM_COMMIT, PAGE_READWRITE))
312 return NULL;
313 }
314 else {
315 if (!VirtualFree((void*)aligned_old_start, aligned_new_start - aligned_old_start, MEM_DECOMMIT))
316 return NULL;
317 }
318 }
319 #else
320 if (stack->start < new_start) {
321 aligned_new_start = (sljit_uw)new_start & ~sljit_page_align;
322 aligned_old_start = ((sljit_uw)stack->start) & ~sljit_page_align;
323 /* If madvise is available, we release the unnecessary space. */
324 #if defined(MADV_DONTNEED)
325 if (aligned_new_start > aligned_old_start)
326 madvise((void*)aligned_old_start, aligned_new_start - aligned_old_start, MADV_DONTNEED);
327 #elif defined(POSIX_MADV_DONTNEED)
328 if (aligned_new_start > aligned_old_start)
329 posix_madvise((void*)aligned_old_start, aligned_new_start - aligned_old_start, POSIX_MADV_DONTNEED);
330 #endif
331 }
332 #endif
333 stack->start = new_start;
334 return new_start;
335 }
336
337 #endif /* SLJIT_UTIL_STACK */
338
339 #endif

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