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 <stdio.h>
22 #include "zend.h"
23 #include "zend_API.h"
24 #include "zend_ast.h"
25 #include "zend_globals.h"
26 #include "zend_constants.h"
27 #include "zend_list.h"
28
29 #if ZEND_DEBUG
30 static void ZEND_FASTCALL zend_string_destroy(zend_string *str);
31 #else
32 # define zend_string_destroy _efree
33 #endif
34 static void ZEND_FASTCALL zend_reference_destroy(zend_reference *ref);
35 static void ZEND_FASTCALL zend_empty_destroy(zend_reference *ref);
36
37 typedef void (ZEND_FASTCALL *zend_rc_dtor_func_t)(zend_refcounted *p);
38
39 static const zend_rc_dtor_func_t zend_rc_dtor_func[] = {
40 [IS_UNDEF] = (zend_rc_dtor_func_t)zend_empty_destroy,
41 [IS_NULL] = (zend_rc_dtor_func_t)zend_empty_destroy,
42 [IS_FALSE] = (zend_rc_dtor_func_t)zend_empty_destroy,
43 [IS_TRUE] = (zend_rc_dtor_func_t)zend_empty_destroy,
44 [IS_LONG] = (zend_rc_dtor_func_t)zend_empty_destroy,
45 [IS_DOUBLE] = (zend_rc_dtor_func_t)zend_empty_destroy,
46 [IS_STRING] = (zend_rc_dtor_func_t)zend_string_destroy,
47 [IS_ARRAY] = (zend_rc_dtor_func_t)zend_array_destroy,
48 [IS_OBJECT] = (zend_rc_dtor_func_t)zend_objects_store_del,
49 [IS_RESOURCE] = (zend_rc_dtor_func_t)zend_list_free,
50 [IS_REFERENCE] = (zend_rc_dtor_func_t)zend_reference_destroy,
51 [IS_CONSTANT_AST] = (zend_rc_dtor_func_t)zend_ast_ref_destroy
52 };
53
rc_dtor_func(zend_refcounted * p)54 ZEND_API void ZEND_FASTCALL rc_dtor_func(zend_refcounted *p)
55 {
56 ZEND_ASSERT(GC_TYPE(p) <= IS_CONSTANT_AST);
57 zend_rc_dtor_func[GC_TYPE(p)](p);
58 }
59
60 #if ZEND_DEBUG
zend_string_destroy(zend_string * str)61 static void ZEND_FASTCALL zend_string_destroy(zend_string *str)
62 {
63 CHECK_ZVAL_STRING(str);
64 ZEND_ASSERT(!ZSTR_IS_INTERNED(str));
65 ZEND_ASSERT(GC_REFCOUNT(str) == 0);
66 ZEND_ASSERT(!(GC_FLAGS(str) & IS_STR_PERSISTENT));
67 efree(str);
68 }
69 #endif
70
zend_reference_destroy(zend_reference * ref)71 static void ZEND_FASTCALL zend_reference_destroy(zend_reference *ref)
72 {
73 ZEND_ASSERT(!ZEND_REF_HAS_TYPE_SOURCES(ref));
74 i_zval_ptr_dtor(&ref->val);
75 efree_size(ref, sizeof(zend_reference));
76 }
77
zend_empty_destroy(zend_reference * ref)78 static void ZEND_FASTCALL zend_empty_destroy(zend_reference *ref)
79 {
80 }
81
zval_ptr_dtor(zval * zval_ptr)82 ZEND_API void zval_ptr_dtor(zval *zval_ptr) /* {{{ */
83 {
84 i_zval_ptr_dtor(zval_ptr);
85 }
86 /* }}} */
87
zval_internal_ptr_dtor(zval * zval_ptr)88 ZEND_API void zval_internal_ptr_dtor(zval *zval_ptr) /* {{{ */
89 {
90 if (Z_REFCOUNTED_P(zval_ptr)) {
91 zend_refcounted *ref = Z_COUNTED_P(zval_ptr);
92
93 if (GC_DELREF(ref) == 0) {
94 if (Z_TYPE_P(zval_ptr) == IS_STRING) {
95 zend_string *str = (zend_string*)ref;
96
97 CHECK_ZVAL_STRING(str);
98 ZEND_ASSERT(!ZSTR_IS_INTERNED(str));
99 ZEND_ASSERT((GC_FLAGS(str) & IS_STR_PERSISTENT));
100 free(str);
101 } else {
102 zend_error_noreturn(E_CORE_ERROR, "Internal zval's can't be arrays, objects, resources or reference");
103 }
104 }
105 }
106 }
107 /* }}} */
108
109 /* This function should only be used as a copy constructor, i.e. it
110 * should only be called AFTER a zval has been copied to another
111 * location using ZVAL_COPY_VALUE. Do not call it before copying,
112 * otherwise a reference may be leaked. */
zval_add_ref(zval * p)113 ZEND_API void zval_add_ref(zval *p)
114 {
115 if (Z_REFCOUNTED_P(p)) {
116 if (Z_ISREF_P(p) && Z_REFCOUNT_P(p) == 1) {
117 ZVAL_COPY(p, Z_REFVAL_P(p));
118 } else {
119 Z_ADDREF_P(p);
120 }
121 }
122 }
123
zval_copy_ctor_func(zval * zvalue)124 ZEND_API void ZEND_FASTCALL zval_copy_ctor_func(zval *zvalue)
125 {
126 if (EXPECTED(Z_TYPE_P(zvalue) == IS_ARRAY)) {
127 ZVAL_ARR(zvalue, zend_array_dup(Z_ARRVAL_P(zvalue)));
128 } else if (EXPECTED(Z_TYPE_P(zvalue) == IS_STRING)) {
129 ZEND_ASSERT(!ZSTR_IS_INTERNED(Z_STR_P(zvalue)));
130 CHECK_ZVAL_STRING(Z_STR_P(zvalue));
131 ZVAL_NEW_STR(zvalue, zend_string_dup(Z_STR_P(zvalue), 0));
132 } else {
133 ZEND_UNREACHABLE();
134 }
135 }
136
