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
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 start_size,sljit_uw max_size,void * allocator_data)206 SLJIT_API_FUNC_ATTRIBUTE struct sljit_stack* SLJIT_FUNC sljit_allocate_stack(sljit_uw start_size, sljit_uw max_size, 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 (start_size > max_size || start_size < 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_size. */
238 max_size = (max_size + sljit_page_align) & ~sljit_page_align;
239
240 #ifdef _WIN32
241 ptr = VirtualAlloc(NULL, max_size, MEM_RESERVE, PAGE_READWRITE);
242 if (!ptr) {
243 SLJIT_FREE(stack, allocator_data);
244 return NULL;
245 }
246
247 stack->min_start = (sljit_u8 *)ptr;
248 stack->end = stack->min_start + max_size;
249 stack->start = stack->end;
250
251 if (sljit_stack_resize(stack, stack->end - start_size) == NULL) {
252 sljit_free_stack(stack, allocator_data);
253 return NULL;
254 }
255 #else
256 #ifdef MAP_ANON
257 ptr = mmap(NULL, max_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
258 #else
259 if (dev_zero < 0) {
260 if (open_dev_zero()) {
261 SLJIT_FREE(stack, allocator_data);
262 return NULL;
263 }
264 }
265 ptr = mmap(NULL, max_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, dev_zero, 0);
266 #endif
267 if (ptr == MAP_FAILED) {
268 SLJIT_FREE(stack, allocator_data);
269 return NULL;
270 }
271 stack->min_start = (sljit_u8 *)ptr;
272 stack->end = stack->min_start + max_size;
273 stack->start = stack->end - start_size;
274 #endif
275 stack->top = stack->end;
276 return stack;
277 }
278
279 #undef PAGE_ALIGN
280
sljit_free_stack(struct sljit_stack * stack,void * allocator_data)281 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_free_stack(struct sljit_stack *stack, void *allocator_data)
282 {
283 SLJIT_UNUSED_ARG(allocator_data);
284 #ifdef _WIN32
285 VirtualFree((void*)stack->min_start, 0, MEM_RELEASE);
286 #else
287 munmap((void*)stack->min_start, stack->end - stack->min_start);
288 #endif
289 SLJIT_FREE(stack, allocator_data);
290 }
291
sljit_stack_resize(struct sljit_stack * stack,sljit_u8 * new_start)292 SLJIT_API_FUNC_ATTRIBUTE sljit_u8 *SLJIT_FUNC sljit_stack_resize(struct sljit_stack *stack, sljit_u8 *new_start)
293 {
294 sljit_uw aligned_old_start;
295 sljit_uw aligned_new_start;
296
297 if ((new_start < stack->min_start) || (new_start >= stack->end))
298 return NULL;
299
300 #ifdef _WIN32
301 aligned_new_start = (sljit_uw)new_start & ~sljit_page_align;
302 aligned_old_start = ((sljit_uw)stack->start) & ~sljit_page_align;
303 if (aligned_new_start != aligned_old_start) {
304 if (aligned_new_start < aligned_old_start) {
305 if (!VirtualAlloc((void*)aligned_new_start, aligned_old_start - aligned_new_start, MEM_COMMIT, PAGE_READWRITE))
306 return NULL;
307 }
308 else {
309 if (!VirtualFree((void*)aligned_old_start, aligned_new_start - aligned_old_start, MEM_DECOMMIT))
310 return NULL;
311 }
312 }
313 #else
314 if (stack->start < new_start) {
315 aligned_new_start = (sljit_uw)new_start & ~sljit_page_align;
316 aligned_old_start = ((sljit_uw)stack->start) & ~sljit_page_align;
317 /* If madvise is available, we release the unnecessary space. */
318 #if defined(MADV_DONTNEED)
319 if (aligned_new_start > aligned_old_start)
320 madvise((void*)aligned_old_start, aligned_new_start - aligned_old_start, MADV_DONTNEED);
321 #elif defined(POSIX_MADV_DONTNEED)
322 if (aligned_new_start > aligned_old_start)
323 posix_madvise((void*)aligned_old_start, aligned_new_start - aligned_old_start, POSIX_MADV_DONTNEED);
324 #endif
325 }
326 #endif
327 stack->start = new_start;
328 return new_start;
329 }
330
331 #endif /* SLJIT_UTIL_STACK */
332
333 #endif
334
