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_FUNC sljit_grab_lock(void)
52 {
53 /* Always successful. */
54 }
55
sljit_release_lock(void)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
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_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
sljit_release_lock(void)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
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_FUNC sljit_grab_lock(void)
134 {
135 pthread_mutex_lock(&global_mutex);
136 }
137
sljit_release_lock(void)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 /* !_WIN32 */
156 /* Provides mmap function. */
157 #include <sys/types.h>
158 #include <sys/mman.h>
159
160 #ifndef MAP_ANON
161 #ifdef MAP_ANONYMOUS
162 #define MAP_ANON MAP_ANONYMOUS
163 #endif /* MAP_ANONYMOUS */
164 #endif /* !MAP_ANON */
165
166 #ifndef MADV_DONTNEED
167 #ifdef POSIX_MADV_DONTNEED
168 #define MADV_DONTNEED POSIX_MADV_DONTNEED
169 #endif /* POSIX_MADV_DONTNEED */
170 #endif /* !MADV_DONTNEED */
171
172 /* For detecting the page size. */
173 #include <unistd.h>
174
175 #ifndef MAP_ANON
176
177 #include <fcntl.h>
178
179 /* Some old systems does not have MAP_ANON. */
180 static sljit_s32 dev_zero = -1;
181
182 #if (defined SLJIT_SINGLE_THREADED && SLJIT_SINGLE_THREADED)
183
open_dev_zero(void)184 static SLJIT_INLINE sljit_s32 open_dev_zero(void)
185 {
186 dev_zero = open("/dev/zero", O_RDWR);
187 return dev_zero < 0;
188 }
189
190 #else /* SLJIT_SINGLE_THREADED */
191
192 #include <pthread.h>
193
194 static pthread_mutex_t dev_zero_mutex = PTHREAD_MUTEX_INITIALIZER;
195
open_dev_zero(void)196 static SLJIT_INLINE sljit_s32 open_dev_zero(void)
197 {
198 pthread_mutex_lock(&dev_zero_mutex);
199 /* The dev_zero might be initialized by another thread during the waiting. */
200 if (dev_zero < 0) {
201 dev_zero = open("/dev/zero", O_RDWR);
202 }
203 pthread_mutex_unlock(&dev_zero_mutex);
204 return dev_zero < 0;
205 }
206
207 #endif /* SLJIT_SINGLE_THREADED */
208
209 #endif /* !MAP_ANON */
210
211 #endif /* _WIN32 */
212
213 #endif /* SLJIT_UTIL_STACK || SLJIT_EXECUTABLE_ALLOCATOR */
214
215 #endif /* SLJIT_EXECUTABLE_ALLOCATOR || SLJIT_UTIL_GLOBAL_LOCK */
216
217 #if (defined SLJIT_UTIL_STACK && SLJIT_UTIL_STACK)
218
219 #if (defined SLJIT_UTIL_SIMPLE_STACK_ALLOCATION && SLJIT_UTIL_SIMPLE_STACK_ALLOCATION)
220
sljit_allocate_stack(sljit_uw start_size,sljit_uw max_size,void * allocator_data)221 SLJIT_API_FUNC_ATTRIBUTE struct sljit_stack* SLJIT_FUNC sljit_allocate_stack(sljit_uw start_size, sljit_uw max_size, void *allocator_data)
222 {
223 struct sljit_stack *stack;
224 void *ptr;
225
226 SLJIT_UNUSED_ARG(allocator_data);
227
228 if (start_size > max_size || start_size < 1)
229 return NULL;
230
231 stack = (struct sljit_stack*)SLJIT_MALLOC(sizeof(struct sljit_stack), allocator_data);
232 if (stack == NULL)
233 return NULL;
234
235 ptr = SLJIT_MALLOC(max_size, allocator_data);
236 if (ptr == NULL) {
237 SLJIT_FREE(stack, allocator_data);
238 return NULL;
239 }
240
241 stack->min_start = (sljit_u8 *)ptr;
242 stack->end = stack->min_start + max_size;
243 stack->start = stack->end - start_size;
244 stack->top = stack->end;
245 return stack;
246 }
247
sljit_free_stack(struct sljit_stack * stack,void * allocator_data)248 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_free_stack(struct sljit_stack *stack, void *allocator_data)
249 {
250 SLJIT_UNUSED_ARG(allocator_data);
251 SLJIT_FREE((void*)stack->min_start, allocator_data);
252 SLJIT_FREE(stack, allocator_data);
253 }
254
sljit_stack_resize(struct sljit_stack * stack,sljit_u8 * new_start)255 SLJIT_API_FUNC_ATTRIBUTE sljit_u8 *SLJIT_FUNC sljit_stack_resize(struct sljit_stack *stack, sljit_u8 *new_start)
256 {
257 if ((new_start < stack->min_start) || (new_start >= stack->end))
258 return NULL;
259 stack->start = new_start;
260 return new_start;
261 }
262
263 #else /* !SLJIT_UTIL_SIMPLE_STACK_ALLOCATION */
264
265 #ifdef _WIN32
266
get_page_alignment(void)267 SLJIT_INLINE static sljit_sw get_page_alignment(void) {
268 SYSTEM_INFO si;
269 static sljit_sw sljit_page_align;
270 if (!sljit_page_align) {
271 GetSystemInfo(&si);
272 sljit_page_align = si.dwPageSize - 1;
273 }
274 return sljit_page_align;
275 }
276
sljit_free_stack(struct sljit_stack * stack,void * allocator_data)277 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_free_stack(struct sljit_stack *stack, void *allocator_data)
278 {
279 SLJIT_UNUSED_ARG(allocator_data);
280 VirtualFree((void*)stack->min_start, 0, MEM_RELEASE);
281 SLJIT_FREE(stack, allocator_data);
282 }
283
284 #else /* ! defined _WIN32 */
285
get_page_alignment(void)286 SLJIT_INLINE static sljit_sw get_page_alignment(void) {
287 static sljit_sw sljit_page_align;
288 if (!sljit_page_align) {
289 sljit_page_align = sysconf(_SC_PAGESIZE);
290 /* Should never happen. */
291 if (sljit_page_align < 0)
292 sljit_page_align = 4096;
293 sljit_page_align--;
294 }
295 return sljit_page_align;
296 }
297
sljit_free_stack(struct sljit_stack * stack,void * allocator_data)298 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_free_stack(struct sljit_stack *stack, void *allocator_data)
299 {
300 SLJIT_UNUSED_ARG(allocator_data);
301 munmap((void*)stack->min_start, stack->end - stack->min_start);
302 SLJIT_FREE(stack, allocator_data);
303 }
304
305 #endif /* defined _WIN32 */
306
sljit_allocate_stack(sljit_uw start_size,sljit_uw max_size,void * allocator_data)307 SLJIT_API_FUNC_ATTRIBUTE struct sljit_stack* SLJIT_FUNC sljit_allocate_stack(sljit_uw start_size, sljit_uw max_size, void *allocator_data)
308 {
309 struct sljit_stack *stack;
310 void *ptr;
311 sljit_sw page_align;
312
313 SLJIT_UNUSED_ARG(allocator_data);
314
315 if (start_size > max_size || start_size < 1)
316 return NULL;
317
318 stack = (struct sljit_stack*)SLJIT_MALLOC(sizeof(struct sljit_stack), allocator_data);
319 if (stack == NULL)
320 return NULL;
321
322 /* Align max_size. */
323 page_align = get_page_alignment();
324 max_size = (max_size + page_align) & ~page_align;
325
326 #ifdef _WIN32
327 ptr = VirtualAlloc(NULL, max_size, MEM_RESERVE, PAGE_READWRITE);
328 if (!ptr) {
329 SLJIT_FREE(stack, allocator_data);
330 return NULL;
331 }
332
333 stack->min_start = (sljit_u8 *)ptr;
334 stack->end = stack->min_start + max_size;
335 stack->start = stack->end;
336
337 if (sljit_stack_resize(stack, stack->end - start_size) == NULL) {
338 sljit_free_stack(stack, allocator_data);
339 return NULL;
340 }
341 #else /* !_WIN32 */
342 #ifdef MAP_ANON
343 ptr = mmap(NULL, max_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
344 #else /* !MAP_ANON */
345 if (dev_zero < 0) {
346 if (open_dev_zero() != 0) {
347 SLJIT_FREE(stack, allocator_data);
348 return NULL;
349 }
350 }
351 ptr = mmap(NULL, max_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, dev_zero, 0);
352 #endif /* MAP_ANON */
353 if (ptr == MAP_FAILED) {
354 SLJIT_FREE(stack, allocator_data);
355 return NULL;
356 }
357 stack->min_start = (sljit_u8 *)ptr;
358 stack->end = stack->min_start + max_size;
359 stack->start = stack->end - start_size;
360 #endif /* _WIN32 */
361
362 stack->top = stack->end;
363 return stack;
364 }
365
sljit_stack_resize(struct sljit_stack * stack,sljit_u8 * new_start)366 SLJIT_API_FUNC_ATTRIBUTE sljit_u8 *SLJIT_FUNC sljit_stack_resize(struct sljit_stack *stack, sljit_u8 *new_start)
367 {
368 #if defined _WIN32 || defined(MADV_DONTNEED)
369 sljit_uw aligned_old_start;
370 sljit_uw aligned_new_start;
371 sljit_sw page_align;
372 #endif
373
374 if ((new_start < stack->min_start) || (new_start >= stack->end))
375 return NULL;
376
377 #ifdef _WIN32
378 page_align = get_page_alignment();
379
380 aligned_new_start = (sljit_uw)new_start & ~page_align;
381 aligned_old_start = ((sljit_uw)stack->start) & ~page_align;
382 if (aligned_new_start != aligned_old_start) {
383 if (aligned_new_start < aligned_old_start) {
384 if (!VirtualAlloc((void*)aligned_new_start, aligned_old_start - aligned_new_start, MEM_COMMIT, PAGE_READWRITE))
385 return NULL;
386 }
387 else {
388 if (!VirtualFree((void*)aligned_old_start, aligned_new_start - aligned_old_start, MEM_DECOMMIT))
389 return NULL;
390 }
391 }
392 #elif defined(MADV_DONTNEED)
393 if (stack->start < new_start) {
394 page_align = get_page_alignment();
395
396 aligned_new_start = (sljit_uw)new_start & ~page_align;
397 aligned_old_start = ((sljit_uw)stack->start) & ~page_align;
398 /* If madvise is available, we release the unnecessary space. */
399 if (aligned_new_start > aligned_old_start)
400 madvise((void*)aligned_old_start, aligned_new_start - aligned_old_start, MADV_DONTNEED);
401 }
402 #endif /* _WIN32 */
403
404 stack->start = new_start;
405 return new_start;
406 }
407
408 #endif /* SLJIT_UTIL_SIMPLE_STACK_ALLOCATION */
409
410 #endif /* SLJIT_UTIL_STACK */
411
