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
allocator_grab_lock(void)37 static SLJIT_INLINE void allocator_grab_lock(void)
38 {
39 /* Always successful. */
40 }
41
allocator_release_lock(void)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
sljit_grab_lock(void)51 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL sljit_grab_lock(void)
52 {
53 /* Always successful. */
54 }
55
sljit_release_lock(void)56 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL 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
allocator_grab_lock(void)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
allocator_release_lock(void)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
sljit_grab_lock(void)91 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL 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
sljit_release_lock(void)100 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL 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
allocator_grab_lock(void)115 static SLJIT_INLINE void allocator_grab_lock(void)
116 {
117 pthread_mutex_lock(&allocator_mutex);
118 }
119
allocator_release_lock(void)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
sljit_grab_lock(void)133 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL sljit_grab_lock(void)
134 {
135 pthread_mutex_lock(&global_mutex);
136 }
137
sljit_release_lock(void)138 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL 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/mman.h>
158 /* For detecting the page size. */
159 #include <unistd.h>
160
161 #ifndef MAP_ANON
162
163 #include <fcntl.h>
164
165 /* Some old systems does not have MAP_ANON. */
166 static sljit_s32 dev_zero = -1;
167
168 #if (defined SLJIT_SINGLE_THREADED && SLJIT_SINGLE_THREADED)
169
open_dev_zero(void)170 static SLJIT_INLINE sljit_s32 open_dev_zero(void)
171 {
172 dev_zero = open("/dev/zero", O_RDWR);
173 return dev_zero < 0;
174 }
175
176 #else /* SLJIT_SINGLE_THREADED */
177
178 #include <pthread.h>
179
180 static pthread_mutex_t dev_zero_mutex = PTHREAD_MUTEX_INITIALIZER;
181
open_dev_zero(void)182 static SLJIT_INLINE sljit_s32 open_dev_zero(void)
183 {
184 pthread_mutex_lock(&dev_zero_mutex);
185 /* The dev_zero might be initialized by another thread during the waiting. */
186 if (dev_zero < 0) {
187 dev_zero = open("/dev/zero", O_RDWR);
188 }
189 pthread_mutex_unlock(&dev_zero_mutex);
190 return dev_zero < 0;
191 }
192
193 #endif /* SLJIT_SINGLE_THREADED */
194
195 #endif
196
197 #endif
198
199 #endif /* SLJIT_UTIL_STACK || SLJIT_EXECUTABLE_ALLOCATOR */
200
201 #if (defined SLJIT_UTIL_STACK && SLJIT_UTIL_STACK)
202
203 /* Planning to make it even more clever in the future. */
204 static sljit_sw sljit_page_align = 0;
205
sljit_allocate_stack(sljit_uw limit,sljit_uw max_limit,void * allocator_data)206 SLJIT_API_FUNC_ATTRIBUTE struct sljit_stack* SLJIT_CALL sljit_allocate_stack(sljit_uw limit, sljit_uw max_limit, void *allocator_data)
207 {
208 struct sljit_stack *stack;
209 void *ptr;
210 #ifdef _WIN32
211 SYSTEM_INFO si;
212 #endif
213
214 SLJIT_UNUSED_ARG(allocator_data);
215 if (limit > max_limit || limit < 1)
216 return NULL;
217
218 #ifdef _WIN32
219 if (!sljit_page_align) {
220 GetSystemInfo(&si);
221 sljit_page_align = si.dwPageSize - 1;
222 }
223 #else
224 if (!sljit_page_align) {
225 sljit_page_align = sysconf(_SC_PAGESIZE);
226 /* Should never happen. */
227 if (sljit_page_align < 0)
228 sljit_page_align = 4096;
229 sljit_page_align--;
230 }
231 #endif
232
233 stack = (struct sljit_stack*)SLJIT_MALLOC(sizeof(struct sljit_stack), allocator_data);
234 if (!stack)
235 return NULL;
236
237 /* Align max_limit. */
238 max_limit = (max_limit + sljit_page_align) & ~sljit_page_align;
239
240 #ifdef _WIN32
241 ptr = VirtualAlloc(NULL, max_limit, MEM_RESERVE, PAGE_READWRITE);
242 if (!ptr) {
243 SLJIT_FREE(stack, allocator_data);
244 return NULL;
245 }
246 stack->max_limit = (sljit_u8 *)ptr;
247 stack->base = stack->max_limit + max_limit;
248 stack->limit = stack->base;
249 if (sljit_stack_resize(stack, stack->base - limit)) {
250 sljit_free_stack(stack, allocator_data);
251 return NULL;
252 }
253 #else
254 #ifdef MAP_ANON
255 ptr = mmap(NULL, max_limit, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
256 #else
257 if (dev_zero < 0) {
258 if (open_dev_zero()) {
259 SLJIT_FREE(stack, allocator_data);
260 return NULL;
261 }
262 }
263 ptr = mmap(NULL, max_limit, PROT_READ | PROT_WRITE, MAP_PRIVATE, dev_zero, 0);
264 #endif
265 if (ptr == MAP_FAILED) {
266 SLJIT_FREE(stack, allocator_data);
267 return NULL;
268 }
269 stack->max_limit = (sljit_u8 *)ptr;
270 stack->base = stack->max_limit + max_limit;
271 stack->limit = stack->base - limit;
272 #endif
273 stack->top = stack->base;
274 return stack;
275 }
276
277 #undef PAGE_ALIGN
278
sljit_free_stack(struct sljit_stack * stack,void * allocator_data)279 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL sljit_free_stack(struct sljit_stack *stack, void *allocator_data)
280 {
281 SLJIT_UNUSED_ARG(allocator_data);
282 #ifdef _WIN32
283 VirtualFree((void*)stack->max_limit, 0, MEM_RELEASE);
284 #else
285 munmap((void*)stack->max_limit, stack->base - stack->max_limit);
286 #endif
287 SLJIT_FREE(stack, allocator_data);
288 }
289
sljit_stack_resize(struct sljit_stack * stack,sljit_u8 * new_limit)290 SLJIT_API_FUNC_ATTRIBUTE sljit_sw SLJIT_CALL sljit_stack_resize(struct sljit_stack *stack, sljit_u8 *new_limit)
291 {
292 sljit_uw aligned_old_limit;
293 sljit_uw aligned_new_limit;
294
295 if ((new_limit < stack->max_limit) || (new_limit >= stack->base))
296 return -1;
297 #ifdef _WIN32
298 aligned_new_limit = (sljit_uw)new_limit & ~sljit_page_align;
299 aligned_old_limit = ((sljit_uw)stack->limit) & ~sljit_page_align;
300 if (aligned_new_limit != aligned_old_limit) {
301 if (aligned_new_limit < aligned_old_limit) {
302 if (!VirtualAlloc((void*)aligned_new_limit, aligned_old_limit - aligned_new_limit, MEM_COMMIT, PAGE_READWRITE))
303 return -1;
304 }
305 else {
306 if (!VirtualFree((void*)aligned_old_limit, aligned_new_limit - aligned_old_limit, MEM_DECOMMIT))
307 return -1;
308 }
309 }
310 stack->limit = new_limit;
311 return 0;
312 #else
313 if (new_limit <= stack->limit) {
314 stack->limit = new_limit;
315 return 0;
316 }
317 aligned_new_limit = (sljit_uw)new_limit & ~sljit_page_align;
318 aligned_old_limit = ((sljit_uw)stack->limit) & ~sljit_page_align;
319 /* If madvise is available, we release the unnecessary space. */
320 #if defined(MADV_DONTNEED)
321 if (aligned_new_limit > aligned_old_limit)
322 madvise((void*)aligned_old_limit, aligned_new_limit - aligned_old_limit, MADV_DONTNEED);
323 #elif defined(POSIX_MADV_DONTNEED)
324 if (aligned_new_limit > aligned_old_limit)
325 posix_madvise((void*)aligned_old_limit, aligned_new_limit - aligned_old_limit, POSIX_MADV_DONTNEED);
326 #endif
327 stack->limit = new_limit;
328 return 0;
329 #endif
330 }
331
332 #endif /* SLJIT_UTIL_STACK */
333
334 #endif
335
