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: Andi Gutmans <andi@php.net> |
16 | Zeev Suraski <zeev@php.net> |
17 | Dmitry Stogov <dmitry@php.net> |
18 +----------------------------------------------------------------------+
19 */
20
21 #include "zend.h"
22 #include "zend_globals.h"
23 #include "zend_variables.h"
24 #include "zend_API.h"
25 #include "zend_interfaces.h"
26 #include "zend_exceptions.h"
27 #include "zend_weakrefs.h"
28
_zend_object_std_init(zend_object * object,zend_class_entry * ce)29 static zend_always_inline void _zend_object_std_init(zend_object *object, zend_class_entry *ce)
30 {
31 GC_SET_REFCOUNT(object, 1);
32 GC_TYPE_INFO(object) = IS_OBJECT | (GC_COLLECTABLE << GC_FLAGS_SHIFT);
33 object->ce = ce;
34 object->properties = NULL;
35 zend_objects_store_put(object);
36 if (UNEXPECTED(ce->ce_flags & ZEND_ACC_USE_GUARDS)) {
37 ZVAL_UNDEF(object->properties_table + object->ce->default_properties_count);
38 }
39 }
40
zend_object_std_init(zend_object * object,zend_class_entry * ce)41 ZEND_API void ZEND_FASTCALL zend_object_std_init(zend_object *object, zend_class_entry *ce)
42 {
43 _zend_object_std_init(object, ce);
44 }
45
zend_object_std_dtor(zend_object * object)46 ZEND_API void zend_object_std_dtor(zend_object *object)
47 {
48 zval *p, *end;
49
50 if (object->properties) {
51 if (EXPECTED(!(GC_FLAGS(object->properties) & IS_ARRAY_IMMUTABLE))) {
52 if (EXPECTED(GC_DELREF(object->properties) == 0)
53 && EXPECTED(GC_TYPE(object->properties) != IS_NULL)) {
54 zend_array_destroy(object->properties);
55 }
56 }
57 }
58 p = object->properties_table;
59 if (EXPECTED(object->ce->default_properties_count)) {
60 end = p + object->ce->default_properties_count;
61 do {
62 if (Z_REFCOUNTED_P(p)) {
63 if (UNEXPECTED(Z_ISREF_P(p)) &&
64 (ZEND_DEBUG || ZEND_REF_HAS_TYPE_SOURCES(Z_REF_P(p)))) {
65 zend_property_info *prop_info = zend_get_property_info_for_slot(object, p);
66 if (prop_info->type) {
67 ZEND_REF_DEL_TYPE_SOURCE(Z_REF_P(p), prop_info);
68 }
69 }
70 i_zval_ptr_dtor(p);
71 }
72 p++;
73 } while (p != end);
74 }
75
76 if (UNEXPECTED(object->ce->ce_flags & ZEND_ACC_USE_GUARDS)) {
77 if (EXPECTED(Z_TYPE_P(p) == IS_STRING)) {
78 zval_ptr_dtor_str(p);
79 } else if (Z_TYPE_P(p) == IS_ARRAY) {
80 HashTable *guards;
81
82 guards = Z_ARRVAL_P(p);
83 ZEND_ASSERT(guards != NULL);
84 zend_hash_destroy(guards);
85 FREE_HASHTABLE(guards);
86 }
87 }
88
89 if (UNEXPECTED(GC_FLAGS(object) & IS_OBJ_WEAKLY_REFERENCED)) {
90 zend_weakrefs_notify(object);
91 }
92 }
93
zend_objects_destroy_object(zend_object * object)94 ZEND_API void zend_objects_destroy_object(zend_object *object)
95 {
96 zend_function *destructor = object->ce->destructor;
97
98 if (destructor) {
99 zend_object *old_exception;
100 zend_class_entry *orig_fake_scope;
101 zend_fcall_info fci;
102 zend_fcall_info_cache fcic;
103 zval ret;
104
105 if (destructor->op_array.fn_flags & (ZEND_ACC_PRIVATE|ZEND_ACC_PROTECTED)) {
106 if (destructor->op_array.fn_flags & ZEND_ACC_PRIVATE) {
107 /* Ensure that if we're calling a private function, we're allowed to do so.
108 */
109 if (EG(current_execute_data)) {
110 zend_class_entry *scope = zend_get_executed_scope();
111
112 if (object->ce != scope) {
113 zend_throw_error(NULL,
114 "Call to private %s::__destruct() from context '%s'",
115 ZSTR_VAL(object->ce->name),
116 scope ? ZSTR_VAL(scope->name) : "");
117 return;
118 }
119 } else {
120 zend_error(E_WARNING,
121 "Call to private %s::__destruct() from context '' during shutdown ignored",
122 ZSTR_VAL(object->ce->name));
123 return;
124 }
125 } else {
126 /* Ensure that if we're calling a protected function, we're allowed to do so.
127 */
128 if (EG(current_execute_data)) {
129 zend_class_entry *scope = zend_get_executed_scope();
130
131 if (!zend_check_protected(zend_get_function_root_class(destructor), scope)) {
132 zend_throw_error(NULL,
133 "Call to protected %s::__destruct() from context '%s'",
134 ZSTR_VAL(object->ce->name),
135 scope ? ZSTR_VAL(scope->name) : "");
136 return;
137 }
138 } else {
139 zend_error(E_WARNING,
140 "Call to protected %s::__destruct() from context '' during shutdown ignored",
141 ZSTR_VAL(object->ce->name));
142 return;
143 }
144 }
145 }
146
147 GC_ADDREF(object);
148
149 /* Make sure that destructors are protected from previously thrown exceptions.
150 * For example, if an exception was thrown in a function and when the function's
151 * local variable destruction results in a destructor being called.
152 */
153 old_exception = NULL;
154 if (EG(exception)) {
155 if (EG(exception) == object) {
156 zend_error_noreturn(E_CORE_ERROR, "Attempt to destruct pending exception");
157 } else {
158 old_exception = EG(exception);
159 EG(exception) = NULL;
160 }
161 }
162 orig_fake_scope = EG(fake_scope);
163 EG(fake_scope) = NULL;
164
165 ZVAL_UNDEF(&ret);
166
167 fci.size = sizeof(fci);
168 fci.object = object;
169 fci.retval = &ret;
170 fci.param_count = 0;
171 fci.params = NULL;
172 fci.no_separation = 1;
173 ZVAL_UNDEF(&fci.function_name); /* Unused */
174
175 fcic.function_handler = destructor;
176 fcic.called_scope = object->ce;
177 fcic.object = object;
178
179 zend_call_function(&fci, &fcic);
180 zval_ptr_dtor(&ret);
181
182 if (old_exception) {
183 if (EG(exception)) {
184 zend_exception_set_previous(EG(exception), old_exception);
185 } else {
186 EG(exception) = old_exception;
187 }
188 }
189 OBJ_RELEASE(object);
190 EG(fake_scope) = orig_fake_scope;
191 }
192 }
193
zend_objects_new(zend_class_entry * ce)194 ZEND_API zend_object* ZEND_FASTCALL zend_objects_new(zend_class_entry *ce)
195 {
196 zend_object *object = emalloc(sizeof(zend_object) + zend_object_properties_size(ce));
197
198 _zend_object_std_init(object, ce);
199 object->handlers = &std_object_handlers;
200 return object;
201 }
202
zend_objects_clone_members(zend_object * new_object,zend_object * old_object)203 ZEND_API void ZEND_FASTCALL zend_objects_clone_members(zend_object *new_object, zend_object *old_object)
204 {
205 if (old_object->ce->default_properties_count) {
206 zval *src = old_object->properties_table;
207 zval *dst = new_object->properties_table;
208 zval *end = src + old_object->ce->default_properties_count;
209
210 do {
211 i_zval_ptr_dtor(dst);
212 ZVAL_COPY_VALUE_PROP(dst, src);
213 zval_add_ref(dst);
214 if (UNEXPECTED(Z_ISREF_P(dst)) &&
215 (ZEND_DEBUG || ZEND_REF_HAS_TYPE_SOURCES(Z_REF_P(dst)))) {
216 zend_property_info *prop_info = zend_get_property_info_for_slot(new_object, dst);
217 if (prop_info->type) {
218 ZEND_REF_ADD_TYPE_SOURCE(Z_REF_P(dst), prop_info);
219 }
220 }
221 src++;
222 dst++;
223 } while (src != end);
224 } else if (old_object->properties && !old_object->ce->clone) {
225 /* fast copy */
226 if (EXPECTED(old_object->handlers == &std_object_handlers)) {
227 if (EXPECTED(!(GC_FLAGS(old_object->properties) & IS_ARRAY_IMMUTABLE))) {
228 GC_ADDREF(old_object->properties);
229 }
230 new_object->properties = old_object->properties;
231 return;
232 }
233 }
234
235 if (old_object->properties &&
236 EXPECTED(zend_hash_num_elements(old_object->properties))) {
237 zval *prop, new_prop;
238 zend_ulong num_key;
239 zend_string *key;
240
241 if (!new_object->properties) {
242 new_object->properties = zend_new_array(zend_hash_num_elements(old_object->properties));
243 zend_hash_real_init_mixed(new_object->properties);
244 } else {
245 zend_hash_extend(new_object->properties, new_object->properties->nNumUsed + zend_hash_num_elements(old_object->properties), 0);
246 }
247
248 HT_FLAGS(new_object->properties) |=
249 HT_FLAGS(old_object->properties) & HASH_FLAG_HAS_EMPTY_IND;
250
251 ZEND_HASH_FOREACH_KEY_VAL(old_object->properties, num_key, key, prop) {
252 if (Z_TYPE_P(prop) == IS_INDIRECT) {
253 ZVAL_INDIRECT(&new_prop, new_object->properties_table + (Z_INDIRECT_P(prop) - old_object->properties_table));
254 } else {
255 ZVAL_COPY_VALUE(&new_prop, prop);
256 zval_add_ref(&new_prop);
257 }
258 if (EXPECTED(key)) {
259 _zend_hash_append(new_object->properties, key, &new_prop);
260 } else {
261 zend_hash_index_add_new(new_object->properties, num_key, &new_prop);
262 }
263 } ZEND_HASH_FOREACH_END();
264 }
265
266 if (old_object->ce->clone) {
267 zend_fcall_info fci;
268 zend_fcall_info_cache fcic;
269 zval ret;
270
271 GC_ADDREF(new_object);
272
273 ZVAL_UNDEF(&ret);
274
275 fci.size = sizeof(fci);
276 fci.object = new_object;
277 fci.retval = &ret;
278 fci.param_count = 0;
279 fci.params = NULL;
280 fci.no_separation = 1;
281 ZVAL_UNDEF(&fci.function_name); /* Unused */
282
283 fcic.function_handler = new_object->ce->clone;
284 fcic.called_scope = new_object->ce;
285 fcic.object = new_object;
286
287 zend_call_function(&fci, &fcic);
288 zval_ptr_dtor(&ret);
289 OBJ_RELEASE(new_object);
290 }
291 }
292
zend_objects_clone_obj(zval * zobject)293 ZEND_API zend_object *zend_objects_clone_obj(zval *zobject)
294 {
295 zend_object *old_object;
296 zend_object *new_object;
297
298 /* assume that create isn't overwritten, so when clone depends on the
299 * overwritten one then it must itself be overwritten */
300 old_object = Z_OBJ_P(zobject);
301 new_object = zend_objects_new(old_object->ce);
302
303 /* zend_objects_clone_members() expect the properties to be initialized. */
304 if (new_object->ce->default_properties_count) {
305 zval *p = new_object->properties_table;
306 zval *end = p + new_object->ce->default_properties_count;
307 do {
308 ZVAL_UNDEF(p);
309 p++;
310 } while (p != end);
311 }
312
313 zend_objects_clone_members(new_object, old_object);
314
315 return new_object;
316 }
317
