1 /*
2 +----------------------------------------------------------------------+
3 | Zend Engine |
4 +----------------------------------------------------------------------+
5 | Copyright (c) Zend Technologies Ltd. (http://www.zend.com) |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 2.00 of the Zend license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.zend.com/license/2_00.txt. |
11 | If you did not receive a copy of the Zend license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@zend.com so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Authors: Dmitry Stogov <dmitry@php.net> |
16 +----------------------------------------------------------------------+
17 */
18
19 #ifndef _ZEND_ARENA_H_
20 #define _ZEND_ARENA_H_
21
22 #include "zend.h"
23
24 #ifndef ZEND_TRACK_ARENA_ALLOC
25
26 typedef struct _zend_arena zend_arena;
27
28 struct _zend_arena {
29 char *ptr;
30 char *end;
31 zend_arena *prev;
32 };
33
zend_arena_create(size_t size)34 static zend_always_inline zend_arena* zend_arena_create(size_t size)
35 {
36 zend_arena *arena = (zend_arena*)emalloc(size);
37
38 arena->ptr = (char*) arena + ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena));
39 arena->end = (char*) arena + size;
40 arena->prev = NULL;
41 return arena;
42 }
43
zend_arena_destroy(zend_arena * arena)44 static zend_always_inline void zend_arena_destroy(zend_arena *arena)
45 {
46 do {
47 zend_arena *prev = arena->prev;
48 efree(arena);
49 arena = prev;
50 } while (arena);
51 }
52
zend_arena_alloc(zend_arena ** arena_ptr,size_t size)53 static zend_always_inline void* zend_arena_alloc(zend_arena **arena_ptr, size_t size)
54 {
55 zend_arena *arena = *arena_ptr;
56 char *ptr = arena->ptr;
57
58 size = ZEND_MM_ALIGNED_SIZE(size);
59
60 if (EXPECTED(size <= (size_t)(arena->end - ptr))) {
61 arena->ptr = ptr + size;
62 } else {
63 size_t arena_size =
64 UNEXPECTED((size + ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena))) > (size_t)(arena->end - (char*) arena)) ?
65 (size + ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena))) :
66 (size_t)(arena->end - (char*) arena);
67 zend_arena *new_arena = (zend_arena*)emalloc(arena_size);
68
69 ptr = (char*) new_arena + ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena));
70 new_arena->ptr = (char*) new_arena + ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena)) + size;
71 new_arena->end = (char*) new_arena + arena_size;
72 new_arena->prev = arena;
73 *arena_ptr = new_arena;
74 }
75
76 return (void*) ptr;
77 }
78
zend_arena_calloc(zend_arena ** arena_ptr,size_t count,size_t unit_size)79 static zend_always_inline void* zend_arena_calloc(zend_arena **arena_ptr, size_t count, size_t unit_size)
80 {
81 int overflow;
82 size_t size;
83 void *ret;
84
85 size = zend_safe_address(unit_size, count, 0, &overflow);
86 if (UNEXPECTED(overflow)) {
87 zend_error(E_ERROR, "Possible integer overflow in zend_arena_calloc() (%zu * %zu)", unit_size, count);
88 }
89 ret = zend_arena_alloc(arena_ptr, size);
90 memset(ret, 0, size);
91 return ret;
92 }
93
zend_arena_checkpoint(zend_arena * arena)94 static zend_always_inline void* zend_arena_checkpoint(zend_arena *arena)
95 {
96 return arena->ptr;
97 }
98
zend_arena_release(zend_arena ** arena_ptr,void * checkpoint)99 static zend_always_inline void zend_arena_release(zend_arena **arena_ptr, void *checkpoint)
100 {
101 zend_arena *arena = *arena_ptr;
102
103 while (UNEXPECTED((char*)checkpoint > arena->end) ||
104 UNEXPECTED((char*)checkpoint <= (char*)arena)) {
105 zend_arena *prev = arena->prev;
106 efree(arena);
107 *arena_ptr = arena = prev;
108 }
109 ZEND_ASSERT((char*)checkpoint > (char*)arena && (char*)checkpoint <= arena->end);
110 arena->ptr = (char*)checkpoint;
111 }
112
zend_arena_contains(zend_arena * arena,void * ptr)113 static zend_always_inline zend_bool zend_arena_contains(zend_arena *arena, void *ptr)
114 {
115 while (arena) {
116 if ((char*)ptr > (char*)arena && (char*)ptr <= arena->ptr) {
117 return 1;
118 }
119 arena = arena->prev;
120 }
121 return 0;
122 }
123
124 #else
125
126 /* Use normal allocations and keep track of them for mass-freeing.
127 * This is intended for use with asan/valgrind. */
128
129 typedef struct _zend_arena zend_arena;
130
131 struct _zend_arena {
132 void **ptr;
133 void **end;
134 struct _zend_arena *prev;
135 void *ptrs[0];
136 };
137
138 #define ZEND_TRACKED_ARENA_SIZE 1000
139
zend_arena_create(size_t _size)140 static zend_always_inline zend_arena *zend_arena_create(size_t _size)
141 {
142 zend_arena *arena = (zend_arena*) emalloc(
143 sizeof(zend_arena) + sizeof(void *) * ZEND_TRACKED_ARENA_SIZE);
144 arena->ptr = &arena->ptrs[0];
145 arena->end = &arena->ptrs[ZEND_TRACKED_ARENA_SIZE];
146 arena->prev = NULL;
147 return arena;
148 }
149
zend_arena_destroy(zend_arena * arena)150 static zend_always_inline void zend_arena_destroy(zend_arena *arena)
151 {
152 do {
153 zend_arena *prev = arena->prev;
154 void **ptr;
155 for (ptr = arena->ptrs; ptr < arena->ptr; ptr++) {
156 efree(*ptr);
157 }
158 efree(arena);
159 arena = prev;
160 } while (arena);
161 }
162
zend_arena_alloc(zend_arena ** arena_ptr,size_t size)163 static zend_always_inline void *zend_arena_alloc(zend_arena **arena_ptr, size_t size)
164 {
165 zend_arena *arena = *arena_ptr;
166 if (arena->ptr == arena->end) {
167 *arena_ptr = zend_arena_create(0);
168 (*arena_ptr)->prev = arena;
169 arena = *arena_ptr;
170 }
171
172 return *arena->ptr++ = emalloc(size);
173 }
174
zend_arena_calloc(zend_arena ** arena_ptr,size_t count,size_t unit_size)175 static zend_always_inline void* zend_arena_calloc(zend_arena **arena_ptr, size_t count, size_t unit_size)
176 {
177 int overflow;
178 size_t size;
179 void *ret;
180
181 size = zend_safe_address(unit_size, count, 0, &overflow);
182 if (UNEXPECTED(overflow)) {
183 zend_error(E_ERROR, "Possible integer overflow in zend_arena_calloc() (%zu * %zu)", unit_size, count);
184 }
185 ret = zend_arena_alloc(arena_ptr, size);
186 memset(ret, 0, size);
187 return ret;
188 }
189
zend_arena_checkpoint(zend_arena * arena)190 static zend_always_inline void* zend_arena_checkpoint(zend_arena *arena)
191 {
192 return arena->ptr;
193 }
194
zend_arena_release(zend_arena ** arena_ptr,void * checkpoint)195 static zend_always_inline void zend_arena_release(zend_arena **arena_ptr, void *checkpoint)
196 {
197 while (1) {
198 zend_arena *arena = *arena_ptr;
199 zend_arena *prev = arena->prev;
200 while (1) {
201 if (arena->ptr == (void **) checkpoint) {
202 return;
203 }
204 if (arena->ptr == arena->ptrs) {
205 break;
206 }
207 arena->ptr--;
208 efree(*arena->ptr);
209 }
210 efree(arena);
211 *arena_ptr = prev;
212 ZEND_ASSERT(*arena_ptr);
213 }
214 }
215
zend_arena_contains(zend_arena * arena,void * ptr)216 static zend_always_inline zend_bool zend_arena_contains(zend_arena *arena, void *ptr)
217 {
218 /* TODO: Dummy */
219 return 1;
220 }
221
222 #endif
223
224 #endif /* _ZEND_ARENA_H_ */
225
