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zend_object_handlers.c
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zend_object_handlers.c
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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2012 Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@zend.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <andi@zend.com> |
| Zeev Suraski <zeev@zend.com> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "zend.h"
#include "zend_globals.h"
#include "zend_variables.h"
#include "zend_API.h"
#include "zend_objects.h"
#include "zend_objects_API.h"
#include "zend_object_handlers.h"
#include "zend_interfaces.h"
#include "zend_closures.h"
#include "zend_compile.h"
#define DEBUG_OBJECT_HANDLERS 0
#define Z_OBJ_P(zval_p) zend_objects_get_address(zval_p TSRMLS_CC)
/*
__X accessors explanation:
if we have __get and property that is not part of the properties array is
requested, we call __get handler. If it fails, we return uninitialized.
if we have __set and property that is not part of the properties array is
set, we call __set handler. If it fails, we do not change the array.
for both handlers above, when we are inside __get/__set, no further calls for
__get/__set for this property of this object will be made, to prevent endless
recursion and enable accessors to change properties array.
if we have __call and method which is not part of the class function table is
called, we cal __call handler.
*/
ZEND_API HashTable *zend_std_get_properties(zval *object TSRMLS_DC) /* {{{ */
{
zend_object *zobj;
zobj = Z_OBJ_P(object);
return zobj->properties;
}
/* }}} */
ZEND_API HashTable *zend_std_get_debug_info(zval *object, int *is_temp TSRMLS_DC) /* {{{ */
{
*is_temp = 0;
return zend_std_get_properties(object TSRMLS_CC);
}
/* }}} */
static zval *zend_std_call_getter(zval *object, zval *member TSRMLS_DC) /* {{{ */
{
zval *retval = NULL;
zend_class_entry *ce = Z_OBJCE_P(object);
/* __get handler is called with one argument:
property name
it should return whether the call was successfull or not
*/
SEPARATE_ARG_IF_REF(member);
zend_call_method_with_1_params(&object, ce, &ce->__get, ZEND_GET_FUNC_NAME, &retval, member);
zval_ptr_dtor(&member);
if (retval) {
Z_DELREF_P(retval);
}
return retval;
}
/* }}} */
static int zend_std_call_setter(zval *object, zval *member, zval *value TSRMLS_DC) /* {{{ */
{
zval *retval = NULL;
int result;
zend_class_entry *ce = Z_OBJCE_P(object);
SEPARATE_ARG_IF_REF(member);
Z_ADDREF_P(value);
/* __set handler is called with two arguments:
property name
value to be set
it should return whether the call was successfull or not
*/
zend_call_method_with_2_params(&object, ce, &ce->__set, ZEND_SET_FUNC_NAME, &retval, member, value);
zval_ptr_dtor(&member);
zval_ptr_dtor(&value);
if (retval) {
result = i_zend_is_true(retval) ? SUCCESS : FAILURE;
zval_ptr_dtor(&retval);
return result;
} else {
return FAILURE;
}
}
/* }}} */
static void zend_std_call_unsetter(zval *object, zval *member TSRMLS_DC) /* {{{ */
{
zend_class_entry *ce = Z_OBJCE_P(object);
/* __unset handler is called with one argument:
property name
*/
SEPARATE_ARG_IF_REF(member);
zend_call_method_with_1_params(&object, ce, &ce->__unset, ZEND_UNSET_FUNC_NAME, NULL, member);
zval_ptr_dtor(&member);
}
/* }}} */
static zval *zend_std_call_issetter(zval *object, zval *member TSRMLS_DC) /* {{{ */
{
zval *retval = NULL;
zend_class_entry *ce = Z_OBJCE_P(object);
/* __isset handler is called with one argument:
property name
it should return whether the property is set or not
*/
SEPARATE_ARG_IF_REF(member);
zend_call_method_with_1_params(&object, ce, &ce->__isset, ZEND_ISSET_FUNC_NAME, &retval, member);
zval_ptr_dtor(&member);
return retval;
}
/* }}} */
static int zend_verify_property_access(zend_property_info *property_info, zend_class_entry *ce TSRMLS_DC) /* {{{ */
{
switch (property_info->flags & ZEND_ACC_PPP_MASK) {
case ZEND_ACC_PUBLIC:
return 1;
case ZEND_ACC_PROTECTED:
return zend_check_protected(property_info->ce, EG(scope));
case ZEND_ACC_PRIVATE:
if ((ce==EG(scope) || property_info->ce == EG(scope)) && EG(scope)) {
return 1;
} else {
return 0;
}
break;
}
return 0;
}
/* }}} */
static inline zend_bool is_derived_class(zend_class_entry *child_class, zend_class_entry *parent_class) /* {{{ */
{
child_class = child_class->parent;
while (child_class) {
if (child_class == parent_class) {
return 1;
}
child_class = child_class->parent;
}
return 0;
}
/* }}} */
ZEND_API struct _zend_property_info *zend_get_property_info(zend_class_entry *ce, zval *member, int silent TSRMLS_DC) /* {{{ */
{
zend_property_info *property_info = NULL;
zend_property_info *scope_property_info;
zend_bool denied_access = 0;
ulong h;
if (Z_STRVAL_P(member)[0] == '\0') {
if (!silent) {
if (Z_STRLEN_P(member) == 0) {
zend_error(E_ERROR, "Cannot access empty property");
} else {
zend_error(E_ERROR, "Cannot access property started with '\\0'");
}
}
return NULL;
}
h = zend_get_hash_value(Z_STRVAL_P(member), Z_STRLEN_P(member) + 1);
if (zend_hash_quick_find(&ce->properties_info, Z_STRVAL_P(member), Z_STRLEN_P(member)+1, h, (void **) &property_info)==SUCCESS) {
if(property_info->flags & ZEND_ACC_SHADOW) {
/* if it's a shadow - go to access it's private */
property_info = NULL;
} else {
if (zend_verify_property_access(property_info, ce TSRMLS_CC)) {
if (property_info->flags & ZEND_ACC_CHANGED
&& !(property_info->flags & ZEND_ACC_PRIVATE)) {
/* We still need to make sure that we're not in a context
* where the right property is a different 'statically linked' private
* continue checking below...
*/
} else {
if (!silent && (property_info->flags & ZEND_ACC_STATIC)) {
zend_error(E_STRICT, "Accessing static property %s::$%s as non static", ce->name, Z_STRVAL_P(member));
}
return property_info;
}
} else {
/* Try to look in the scope instead */
denied_access = 1;
}
}
}
if (EG(scope) != ce
&& is_derived_class(ce, EG(scope))
&& EG(scope)
&& zend_hash_quick_find(&EG(scope)->properties_info, Z_STRVAL_P(member), Z_STRLEN_P(member)+1, h, (void **) &scope_property_info)==SUCCESS
&& scope_property_info->flags & ZEND_ACC_PRIVATE) {
return scope_property_info;
} else if (property_info) {
if (denied_access) {
/* Information was available, but we were denied access. Error out. */
if (silent) {
return NULL;
}
zend_error(E_ERROR, "Cannot access %s property %s::$%s", zend_visibility_string(property_info->flags), ce->name, Z_STRVAL_P(member));
} else {
/* fall through, return property_info... */
}
} else {
EG(std_property_info).flags = ZEND_ACC_PUBLIC;
EG(std_property_info).name = Z_STRVAL_P(member);
EG(std_property_info).name_length = Z_STRLEN_P(member);
EG(std_property_info).h = h;
EG(std_property_info).ce = ce;
property_info = &EG(std_property_info);
}
return property_info;
}
/* }}} */
ZEND_API int zend_check_property_access(zend_object *zobj, char *prop_info_name, int prop_info_name_len TSRMLS_DC) /* {{{ */
{
zend_property_info *property_info;
char *class_name, *prop_name;
zval member;
zend_unmangle_property_name(prop_info_name, prop_info_name_len, &class_name, &prop_name);
ZVAL_STRING(&member, prop_name, 0);
property_info = zend_get_property_info(zobj->ce, &member, 1 TSRMLS_CC);
if (!property_info) {
return FAILURE;
}
if (class_name && class_name[0] != '*') {
if (!(property_info->flags & ZEND_ACC_PRIVATE)) {
/* we we're looking for a private prop but found a non private one of the same name */
return FAILURE;
} else if (strcmp(prop_info_name+1, property_info->name+1)) {
/* we we're looking for a private prop but found a private one of the same name but another class */
return FAILURE;
}
}
return zend_verify_property_access(property_info, zobj->ce TSRMLS_CC) ? SUCCESS : FAILURE;
}
/* }}} */
static int zend_get_property_guard(zend_object *zobj, zend_property_info *property_info, zval *member, zend_guard **pguard) /* {{{ */
{
zend_property_info info;
zend_guard stub;
if (!property_info) {
property_info = &info;
info.name = Z_STRVAL_P(member);
info.name_length = Z_STRLEN_P(member);
info.h = zend_get_hash_value(Z_STRVAL_P(member), Z_STRLEN_P(member) + 1);
}
if (!zobj->guards) {
ALLOC_HASHTABLE(zobj->guards);
zend_hash_init(zobj->guards, 0, NULL, NULL, 0);
} else if (zend_hash_quick_find(zobj->guards, property_info->name, property_info->name_length+1, property_info->h, (void **) pguard) == SUCCESS) {
return SUCCESS;
}
stub.in_get = 0;
stub.in_set = 0;
stub.in_unset = 0;
stub.in_isset = 0;
return zend_hash_quick_add(zobj->guards, property_info->name, property_info->name_length+1, property_info->h, (void**)&stub, sizeof(stub), (void**) pguard);
}
/* }}} */
zval *zend_std_read_property(zval *object, zval *member, int type TSRMLS_DC) /* {{{ */
{
zend_object *zobj;
zval *tmp_member = NULL;
zval **retval;
zval *rv = NULL;
zend_property_info *property_info;
int silent;
silent = (type == BP_VAR_IS);
zobj = Z_OBJ_P(object);
if (Z_TYPE_P(member) != IS_STRING) {
ALLOC_ZVAL(tmp_member);
*tmp_member = *member;
INIT_PZVAL(tmp_member);
zval_copy_ctor(tmp_member);
convert_to_string(tmp_member);
member = tmp_member;
}
#if DEBUG_OBJECT_HANDLERS
fprintf(stderr, "Read object #%d property: %s\n", Z_OBJ_HANDLE_P(object), Z_STRVAL_P(member));
#endif
/* make zend_get_property_info silent if we have getter - we may want to use it */
property_info = zend_get_property_info(zobj->ce, member, (zobj->ce->__get != NULL) TSRMLS_CC);
if (!property_info || zend_hash_quick_find(zobj->properties, property_info->name, property_info->name_length+1, property_info->h, (void **) &retval) == FAILURE) {
zend_guard *guard = NULL;
if (zobj->ce->__get &&
zend_get_property_guard(zobj, property_info, member, &guard) == SUCCESS &&
!guard->in_get) {
/* have getter - try with it! */
Z_ADDREF_P(object);
if (PZVAL_IS_REF(object)) {
SEPARATE_ZVAL(&object);
}
guard->in_get = 1; /* prevent circular getting */
rv = zend_std_call_getter(object, member TSRMLS_CC);
guard->in_get = 0;
if (rv) {
retval = &rv;
if (!Z_ISREF_P(rv) &&
(type == BP_VAR_W || type == BP_VAR_RW || type == BP_VAR_UNSET)) {
if (Z_REFCOUNT_P(rv) > 0) {
zval *tmp = rv;
ALLOC_ZVAL(rv);
*rv = *tmp;
zval_copy_ctor(rv);
Z_UNSET_ISREF_P(rv);
Z_SET_REFCOUNT_P(rv, 0);
}
if (Z_TYPE_P(rv) != IS_OBJECT) {
zend_error(E_NOTICE, "Indirect modification of overloaded property %s::$%s has no effect", zobj->ce->name, Z_STRVAL_P(member));
}
}
} else {
retval = &EG(uninitialized_zval_ptr);
}
if (EXPECTED(*retval != object)) {
zval_ptr_dtor(&object);
} else {
Z_DELREF_P(object);
}
} else {
if (zobj->ce->__get && guard && guard->in_get == 1) {
if (Z_STRVAL_P(member)[0] == '\0') {
if (Z_STRLEN_P(member) == 0) {
zend_error(E_ERROR, "Cannot access empty property");
} else {
zend_error(E_ERROR, "Cannot access property started with '\\0'");
}
}
}
if (!silent) {
zend_error(E_NOTICE,"Undefined property: %s::$%s", zobj->ce->name, Z_STRVAL_P(member));
}
retval = &EG(uninitialized_zval_ptr);
}
}
if (tmp_member) {
Z_ADDREF_PP(retval);
zval_ptr_dtor(&tmp_member);
Z_DELREF_PP(retval);
}
return *retval;
}
/* }}} */
static void zend_std_write_property(zval *object, zval *member, zval *value TSRMLS_DC) /* {{{ */
{
zend_object *zobj;
zval *tmp_member = NULL;
zval **variable_ptr;
zend_property_info *property_info;
zobj = Z_OBJ_P(object);
if (Z_TYPE_P(member) != IS_STRING) {
ALLOC_ZVAL(tmp_member);
*tmp_member = *member;
INIT_PZVAL(tmp_member);
zval_copy_ctor(tmp_member);
convert_to_string(tmp_member);
member = tmp_member;
}
property_info = zend_get_property_info(zobj->ce, member, (zobj->ce->__set != NULL) TSRMLS_CC);
if (property_info && zend_hash_quick_find(zobj->properties, property_info->name, property_info->name_length+1, property_info->h, (void **) &variable_ptr) == SUCCESS) {
/* if we already have this value there, we don't actually need to do anything */
if (*variable_ptr != value) {
/* if we are assigning reference, we shouldn't move it, but instead assign variable
to the same pointer */
if (PZVAL_IS_REF(*variable_ptr)) {
zval garbage = **variable_ptr; /* old value should be destroyed */
/* To check: can't *variable_ptr be some system variable like error_zval here? */
Z_TYPE_PP(variable_ptr) = Z_TYPE_P(value);
(*variable_ptr)->value = value->value;
if (Z_REFCOUNT_P(value) > 0) {
zval_copy_ctor(*variable_ptr);
}
zval_dtor(&garbage);
} else {
zval *garbage = *variable_ptr;
/* if we assign referenced variable, we should separate it */
Z_ADDREF_P(value);
if (PZVAL_IS_REF(value)) {
SEPARATE_ZVAL(&value);
}
*variable_ptr = value;
zval_ptr_dtor(&garbage);
}
}
} else {
zend_guard *guard = NULL;
if (zobj->ce->__set &&
zend_get_property_guard(zobj, property_info, member, &guard) == SUCCESS &&
!guard->in_set) {
Z_ADDREF_P(object);
if (PZVAL_IS_REF(object)) {
SEPARATE_ZVAL(&object);
}
guard->in_set = 1; /* prevent circular setting */
if (zend_std_call_setter(object, member, value TSRMLS_CC) != SUCCESS) {
/* for now, just ignore it - __set should take care of warnings, etc. */
}
guard->in_set = 0;
zval_ptr_dtor(&object);
} else if (property_info) {
zval **foo;
/* if we assign referenced variable, we should separate it */
Z_ADDREF_P(value);
if (PZVAL_IS_REF(value)) {
SEPARATE_ZVAL(&value);
}
zend_hash_quick_update(zobj->properties, property_info->name, property_info->name_length+1, property_info->h, &value, sizeof(zval *), (void **) &foo);
} else if (zobj->ce->__set && guard && guard->in_set == 1) {
if (Z_STRVAL_P(member)[0] == '\0') {
if (Z_STRLEN_P(member) == 0) {
zend_error(E_ERROR, "Cannot access empty property");
} else {
zend_error(E_ERROR, "Cannot access property started with '\\0'");
}
}
}
}
if (tmp_member) {
zval_ptr_dtor(&tmp_member);
}
}
/* }}} */
zval *zend_std_read_dimension(zval *object, zval *offset, int type TSRMLS_DC) /* {{{ */
{
zend_class_entry *ce = Z_OBJCE_P(object);
zval *retval;
if (instanceof_function_ex(ce, zend_ce_arrayaccess, 1 TSRMLS_CC)) {
if(offset == NULL) {
/* [] construct */
ALLOC_INIT_ZVAL(offset);
} else {
SEPARATE_ARG_IF_REF(offset);
}
zend_call_method_with_1_params(&object, ce, NULL, "offsetget", &retval, offset);
zval_ptr_dtor(&offset);
if (!retval) {
if (!EG(exception)) {
zend_error(E_ERROR, "Undefined offset for object of type %s used as array", ce->name);
}
return 0;
}
/* Undo PZVAL_LOCK() */
Z_DELREF_P(retval);
return retval;
} else {
zend_error(E_ERROR, "Cannot use object of type %s as array", ce->name);
return 0;
}
}
/* }}} */
static void zend_std_write_dimension(zval *object, zval *offset, zval *value TSRMLS_DC) /* {{{ */
{
zend_class_entry *ce = Z_OBJCE_P(object);
if (instanceof_function_ex(ce, zend_ce_arrayaccess, 1 TSRMLS_CC)) {
if (!offset) {
ALLOC_INIT_ZVAL(offset);
} else {
SEPARATE_ARG_IF_REF(offset);
}
zend_call_method_with_2_params(&object, ce, NULL, "offsetset", NULL, offset, value);
zval_ptr_dtor(&offset);
} else {
zend_error(E_ERROR, "Cannot use object of type %s as array", ce->name);
}
}
/* }}} */
static int zend_std_has_dimension(zval *object, zval *offset, int check_empty TSRMLS_DC) /* {{{ */
{
zend_class_entry *ce = Z_OBJCE_P(object);
zval *retval;
int result;
if (instanceof_function_ex(ce, zend_ce_arrayaccess, 1 TSRMLS_CC)) {
SEPARATE_ARG_IF_REF(offset);
zend_call_method_with_1_params(&object, ce, NULL, "offsetexists", &retval, offset);
if (retval) {
result = i_zend_is_true(retval);
zval_ptr_dtor(&retval);
if (check_empty && result && !EG(exception)) {
zend_call_method_with_1_params(&object, ce, NULL, "offsetget", &retval, offset);
if (retval) {
result = i_zend_is_true(retval);
zval_ptr_dtor(&retval);
}
}
} else {
result = 0;
}
zval_ptr_dtor(&offset);
} else {
zend_error(E_ERROR, "Cannot use object of type %s as array", ce->name);
return 0;
}
return result;
}
/* }}} */
static zval **zend_std_get_property_ptr_ptr(zval *object, zval *member TSRMLS_DC) /* {{{ */
{
zend_object *zobj;
zval tmp_member;
zval **retval;
zend_property_info *property_info;
zobj = Z_OBJ_P(object);
if (Z_TYPE_P(member) != IS_STRING) {
tmp_member = *member;
zval_copy_ctor(&tmp_member);
convert_to_string(&tmp_member);
member = &tmp_member;
}
#if DEBUG_OBJECT_HANDLERS
fprintf(stderr, "Ptr object #%d property: %s\n", Z_OBJ_HANDLE_P(object), Z_STRVAL_P(member));
#endif
property_info = zend_get_property_info(zobj->ce, member, (zobj->ce->__get != NULL) TSRMLS_CC);
if (!property_info || zend_hash_quick_find(zobj->properties, property_info->name, property_info->name_length+1, property_info->h, (void **) &retval) == FAILURE) {
zval *new_zval;
zend_guard *guard;
if (!zobj->ce->__get ||
zend_get_property_guard(zobj, property_info, member, &guard) != SUCCESS ||
(property_info && guard->in_get)) {
/* we don't have access controls - will just add it */
new_zval = &EG(uninitialized_zval);
/* zend_error(E_NOTICE, "Undefined property: %s", Z_STRVAL_P(member)); */
Z_ADDREF_P(new_zval);
zend_hash_quick_update(zobj->properties, property_info->name, property_info->name_length+1, property_info->h, &new_zval, sizeof(zval *), (void **) &retval);
} else {
/* we do have getter - fail and let it try again with usual get/set */
retval = NULL;
}
}
if (member == &tmp_member) {
zval_dtor(member);
}
return retval;
}
/* }}} */
static void zend_std_unset_property(zval *object, zval *member TSRMLS_DC) /* {{{ */
{
zend_object *zobj;
zval *tmp_member = NULL;
zend_property_info *property_info;
zobj = Z_OBJ_P(object);
if (Z_TYPE_P(member) != IS_STRING) {
ALLOC_ZVAL(tmp_member);
*tmp_member = *member;
INIT_PZVAL(tmp_member);
zval_copy_ctor(tmp_member);
convert_to_string(tmp_member);
member = tmp_member;
}
property_info = zend_get_property_info(zobj->ce, member, (zobj->ce->__unset != NULL) TSRMLS_CC);
if (!property_info || zend_hash_quick_del(zobj->properties, property_info->name, property_info->name_length+1, property_info->h) == FAILURE) {
zend_guard *guard = NULL;
if (zobj->ce->__unset &&
zend_get_property_guard(zobj, property_info, member, &guard) == SUCCESS &&
!guard->in_unset) {
/* have unseter - try with it! */
Z_ADDREF_P(object);
if (PZVAL_IS_REF(object)) {
SEPARATE_ZVAL(&object);
}
guard->in_unset = 1; /* prevent circular unsetting */
zend_std_call_unsetter(object, member TSRMLS_CC);
guard->in_unset = 0;
zval_ptr_dtor(&object);
} else if (zobj->ce->__unset && guard && guard->in_unset == 1) {
if (Z_STRVAL_P(member)[0] == '\0') {
if (Z_STRLEN_P(member) == 0) {
zend_error(E_ERROR, "Cannot access empty property");
} else {
zend_error(E_ERROR, "Cannot access property started with '\\0'");
}
}
}
}
if (tmp_member) {
zval_ptr_dtor(&tmp_member);
}
}
/* }}} */
static void zend_std_unset_dimension(zval *object, zval *offset TSRMLS_DC) /* {{{ */
{
zend_class_entry *ce = Z_OBJCE_P(object);
if (instanceof_function_ex(ce, zend_ce_arrayaccess, 1 TSRMLS_CC)) {
SEPARATE_ARG_IF_REF(offset);
zend_call_method_with_1_params(&object, ce, NULL, "offsetunset", NULL, offset);
zval_ptr_dtor(&offset);
} else {
zend_error(E_ERROR, "Cannot use object of type %s as array", ce->name);
}
}
/* }}} */
ZEND_API void zend_std_call_user_call(INTERNAL_FUNCTION_PARAMETERS) /* {{{ */
{
zend_internal_function *func = (zend_internal_function *)EG(current_execute_data)->function_state.function;
zval *method_name_ptr, *method_args_ptr;
zval *method_result_ptr = NULL;
zend_class_entry *ce = Z_OBJCE_P(this_ptr);
ALLOC_ZVAL(method_args_ptr);
INIT_PZVAL(method_args_ptr);
array_init_size(method_args_ptr, ZEND_NUM_ARGS());
if (zend_copy_parameters_array(ZEND_NUM_ARGS(), method_args_ptr TSRMLS_CC) == FAILURE) {
zval_dtor(method_args_ptr);
zend_error(E_ERROR, "Cannot get arguments for __call");
RETURN_FALSE;
}
ALLOC_ZVAL(method_name_ptr);
INIT_PZVAL(method_name_ptr);
ZVAL_STRING(method_name_ptr, func->function_name, 0); /* no dup - it's a copy */
/* __call handler is called with two arguments:
method name
array of method parameters
*/
zend_call_method_with_2_params(&this_ptr, ce, &ce->__call, ZEND_CALL_FUNC_NAME, &method_result_ptr, method_name_ptr, method_args_ptr);
if (method_result_ptr) {
if (Z_ISREF_P(method_result_ptr) || Z_REFCOUNT_P(method_result_ptr) > 1) {
RETVAL_ZVAL(method_result_ptr, 1, 1);
} else {
RETVAL_ZVAL(method_result_ptr, 0, 1);
}
}
/* now destruct all auxiliaries */
zval_ptr_dtor(&method_args_ptr);
zval_ptr_dtor(&method_name_ptr);
/* destruct the function also, then - we have allocated it in get_method */
efree(func);
}
/* }}} */
/* Ensures that we're allowed to call a private method.
* Returns the function address that should be called, or NULL
* if no such function exists.
*/
static inline zend_function *zend_check_private_int(zend_function *fbc, zend_class_entry *ce, char *function_name_strval, int function_name_strlen TSRMLS_DC) /* {{{ */
{
if (!ce) {
return 0;
}
/* We may call a private function if:
* 1. The class of our object is the same as the scope, and the private
* function (EX(fbc)) has the same scope.
* 2. One of our parent classes are the same as the scope, and it contains
* a private function with the same name that has the same scope.
*/
if (fbc->common.scope == ce && EG(scope) == ce) {
/* rule #1 checks out ok, allow the function call */
return fbc;
}
/* Check rule #2 */
ce = ce->parent;
while (ce) {
if (ce == EG(scope)) {
if (zend_hash_find(&ce->function_table, function_name_strval, function_name_strlen+1, (void **) &fbc)==SUCCESS
&& fbc->op_array.fn_flags & ZEND_ACC_PRIVATE
&& fbc->common.scope == EG(scope)) {
return fbc;
}
break;
}
ce = ce->parent;
}
return NULL;
}
/* }}} */
ZEND_API int zend_check_private(zend_function *fbc, zend_class_entry *ce, char *function_name_strval, int function_name_strlen TSRMLS_DC) /* {{{ */
{
return zend_check_private_int(fbc, ce, function_name_strval, function_name_strlen TSRMLS_CC) != NULL;
}
/* }}} */
/* Ensures that we're allowed to call a protected method.
*/
ZEND_API int zend_check_protected(zend_class_entry *ce, zend_class_entry *scope) /* {{{ */
{
zend_class_entry *fbc_scope = ce;
/* Is the context that's calling the function, the same as one of
* the function's parents?
*/
while (fbc_scope) {
if (fbc_scope==scope) {
return 1;
}
fbc_scope = fbc_scope->parent;
}
/* Is the function's scope the same as our current object context,
* or any of the parents of our context?
*/
while (scope) {
if (scope==ce) {
return 1;
}
scope = scope->parent;
}
return 0;
}
/* }}} */
static inline zend_class_entry * zend_get_function_root_class(zend_function *fbc) /* {{{ */
{
return fbc->common.prototype ? fbc->common.prototype->common.scope : fbc->common.scope;
}
/* }}} */
static inline union _zend_function *zend_get_user_call_function(zend_class_entry *ce, const char *method_name, int method_len) /* {{{ */
{
zend_internal_function *call_user_call = emalloc(sizeof(zend_internal_function));
call_user_call->type = ZEND_INTERNAL_FUNCTION;
call_user_call->module = ce->module;
call_user_call->handler = zend_std_call_user_call;
call_user_call->arg_info = NULL;
call_user_call->num_args = 0;
call_user_call->scope = ce;
call_user_call->fn_flags = ZEND_ACC_CALL_VIA_HANDLER;
call_user_call->function_name = estrndup(method_name, method_len);
call_user_call->pass_rest_by_reference = 0;
call_user_call->return_reference = ZEND_RETURN_VALUE;
return (union _zend_function *)call_user_call;
}
/* }}} */
static union _zend_function *zend_std_get_method(zval **object_ptr, char *method_name, int method_len TSRMLS_DC) /* {{{ */
{
zend_object *zobj;
zend_function *fbc;
char *lc_method_name;
zval *object = *object_ptr;
ALLOCA_FLAG(use_heap)
lc_method_name = do_alloca(method_len+1, use_heap);
/* Create a zend_copy_str_tolower(dest, src, src_length); */
zend_str_tolower_copy(lc_method_name, method_name, method_len);
zobj = Z_OBJ_P(object);
if (zend_hash_find(&zobj->ce->function_table, lc_method_name, method_len+1, (void **)&fbc) == FAILURE) {
free_alloca(lc_method_name, use_heap);
if (zobj->ce->__call) {
return zend_get_user_call_function(zobj->ce, method_name, method_len);
} else {
return NULL;
}
}
/* Check access level */
if (fbc->op_array.fn_flags & ZEND_ACC_PRIVATE) {
zend_function *updated_fbc;
/* Ensure that if we're calling a private function, we're allowed to do so.
* If we're not and __call() handler exists, invoke it, otherwise error out.
*/
updated_fbc = zend_check_private_int(fbc, Z_OBJ_HANDLER_P(object, get_class_entry)(object TSRMLS_CC), lc_method_name, method_len TSRMLS_CC);
if (updated_fbc) {
fbc = updated_fbc;
} else {
if (zobj->ce->__call) {
fbc = zend_get_user_call_function(zobj->ce, method_name, method_len);
} else {
zend_error(E_ERROR, "Call to %s method %s::%s() from context '%s'", zend_visibility_string(fbc->common.fn_flags), ZEND_FN_SCOPE_NAME(fbc), method_name, EG(scope) ? EG(scope)->name : "");
}
}
} else {
/* Ensure that we haven't overridden a private function and end up calling
* the overriding public function...
*/
if (EG(scope) &&
is_derived_class(fbc->common.scope, EG(scope)) &&
fbc->op_array.fn_flags & ZEND_ACC_CHANGED) {
zend_function *priv_fbc;
if (zend_hash_find(&EG(scope)->function_table, lc_method_name, method_len+1, (void **) &priv_fbc)==SUCCESS
&& priv_fbc->common.fn_flags & ZEND_ACC_PRIVATE
&& priv_fbc->common.scope == EG(scope)) {
fbc = priv_fbc;
}
}
if ((fbc->common.fn_flags & ZEND_ACC_PROTECTED)) {
/* Ensure that if we're calling a protected function, we're allowed to do so.
* If we're not and __call() handler exists, invoke it, otherwise error out.
*/
if (!zend_check_protected(zend_get_function_root_class(fbc), EG(scope))) {
if (zobj->ce->__call) {
fbc = zend_get_user_call_function(zobj->ce, method_name, method_len);
} else {
zend_error(E_ERROR, "Call to %s method %s::%s() from context '%s'", zend_visibility_string(fbc->common.fn_flags), ZEND_FN_SCOPE_NAME(fbc), method_name, EG(scope) ? EG(scope)->name : "");
}
}
}
}
free_alloca(lc_method_name, use_heap);
return fbc;
}
/* }}} */
ZEND_API void zend_std_callstatic_user_call(INTERNAL_FUNCTION_PARAMETERS) /* {{{ */
{
zend_internal_function *func = (zend_internal_function *)EG(current_execute_data)->function_state.function;
zval *method_name_ptr, *method_args_ptr;
zval *method_result_ptr = NULL;
zend_class_entry *ce = EG(scope);
ALLOC_ZVAL(method_args_ptr);
INIT_PZVAL(method_args_ptr);
array_init_size(method_args_ptr, ZEND_NUM_ARGS());
if (zend_copy_parameters_array(ZEND_NUM_ARGS(), method_args_ptr TSRMLS_CC) == FAILURE) {
zval_dtor(method_args_ptr);
zend_error(E_ERROR, "Cannot get arguments for " ZEND_CALLSTATIC_FUNC_NAME);
RETURN_FALSE;
}
ALLOC_ZVAL(method_name_ptr);
INIT_PZVAL(method_name_ptr);
ZVAL_STRING(method_name_ptr, func->function_name, 0); /* no dup - it's a copy */
/* __callStatic handler is called with two arguments:
method name
array of method parameters
*/
zend_call_method_with_2_params(NULL, ce, &ce->__callstatic, ZEND_CALLSTATIC_FUNC_NAME, &method_result_ptr, method_name_ptr, method_args_ptr);
if (method_result_ptr) {
if (Z_ISREF_P(method_result_ptr) || Z_REFCOUNT_P(method_result_ptr) > 1) {
RETVAL_ZVAL(method_result_ptr, 1, 1);
} else {
RETVAL_ZVAL(method_result_ptr, 0, 1);
}
}
/* now destruct all auxiliaries */
zval_ptr_dtor(&method_args_ptr);
zval_ptr_dtor(&method_name_ptr);
/* destruct the function also, then - we have allocated it in get_method */
efree(func);
}
/* }}} */
static inline union _zend_function *zend_get_user_callstatic_function(zend_class_entry *ce, const char *method_name, int method_len) /* {{{ */
{
zend_internal_function *callstatic_user_call = emalloc(sizeof(zend_internal_function));
callstatic_user_call->type = ZEND_INTERNAL_FUNCTION;
callstatic_user_call->module = ce->module;
callstatic_user_call->handler = zend_std_callstatic_user_call;
callstatic_user_call->arg_info = NULL;
callstatic_user_call->num_args = 0;
callstatic_user_call->scope = ce;
callstatic_user_call->fn_flags = ZEND_ACC_STATIC | ZEND_ACC_PUBLIC | ZEND_ACC_CALL_VIA_HANDLER;
callstatic_user_call->function_name = estrndup(method_name, method_len);
callstatic_user_call->pass_rest_by_reference = 0;
callstatic_user_call->return_reference = ZEND_RETURN_VALUE;
return (zend_function *)callstatic_user_call;
}
/* }}} */
/* This is not (yet?) in the API, but it belongs in the built-in objects callbacks */
ZEND_API zend_function *zend_std_get_static_method(zend_class_entry *ce, char *function_name_strval, int function_name_strlen TSRMLS_DC) /* {{{ */
{
zend_function *fbc = NULL;
char *lc_class_name, *lc_function_name = NULL;
lc_function_name = zend_str_tolower_dup(function_name_strval, function_name_strlen);
if (function_name_strlen == ce->name_length && ce->constructor) {
lc_class_name = zend_str_tolower_dup(ce->name, ce->name_length);
/* Only change the method to the constructor if the constructor isn't called __construct
* we check for __ so we can be binary safe for lowering, we should use ZEND_CONSTRUCTOR_FUNC_NAME
*/
if (!memcmp(lc_class_name, lc_function_name, function_name_strlen) && memcmp(ce->constructor->common.function_name, "__", sizeof("__") - 1)) {
fbc = ce->constructor;
}
efree(lc_class_name);
}
if (!fbc && zend_hash_find(&ce->function_table, lc_function_name, function_name_strlen+1, (void **) &fbc)==FAILURE) {
efree(lc_function_name);
if (ce->__call &&
EG(This) &&
Z_OBJ_HT_P(EG(This))->get_class_entry &&
instanceof_function(Z_OBJCE_P(EG(This)), ce TSRMLS_CC)) {
return zend_get_user_call_function(ce, function_name_strval, function_name_strlen);
} else if (ce->__callstatic) {
return zend_get_user_callstatic_function(ce, function_name_strval, function_name_strlen);
} else {
return NULL;
}