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zend_inheritance.c
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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2015 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 |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <[email protected]> |
| Zeev Suraski <[email protected]> |
+----------------------------------------------------------------------+
*/
#include "zend.h"
#include "zend_API.h"
#include "zend_compile.h"
#include "zend_execute.h"
#include "zend_inheritance.h"
#include "zend_smart_str.h"
static void ptr_dtor(zval *zv) /* {{{ */
{
efree(Z_PTR_P(zv));
}
/* }}} */
static zend_property_info *zend_duplicate_property_info(zend_property_info *property_info) /* {{{ */
{
zend_property_info* new_property_info;
new_property_info = zend_arena_alloc(&CG(arena), sizeof(zend_property_info));
memcpy(new_property_info, property_info, sizeof(zend_property_info));
zend_string_addref(new_property_info->name);
if (new_property_info->doc_comment) {
zend_string_addref(new_property_info->doc_comment);
}
return new_property_info;
}
/* }}} */
static zend_property_info *zend_duplicate_property_info_internal(zend_property_info *property_info) /* {{{ */
{
zend_property_info* new_property_info = pemalloc(sizeof(zend_property_info), 1);
memcpy(new_property_info, property_info, sizeof(zend_property_info));
zend_string_addref(new_property_info->name);
return new_property_info;
}
/* }}} */
static void do_inherit_parent_constructor(zend_class_entry *ce) /* {{{ */
{
zend_function *function, *new_function;
if (!ce->parent) {
return;
}
/* You cannot change create_object */
ce->create_object = ce->parent->create_object;
/* Inherit special functions if needed */
if (!ce->get_iterator) {
ce->get_iterator = ce->parent->get_iterator;
}
if (!ce->iterator_funcs.funcs) {
ce->iterator_funcs.funcs = ce->parent->iterator_funcs.funcs;
}
if (!ce->__get) {
ce->__get = ce->parent->__get;
}
if (!ce->__set) {
ce->__set = ce->parent->__set;
}
if (!ce->__unset) {
ce->__unset = ce->parent->__unset;
}
if (!ce->__isset) {
ce->__isset = ce->parent->__isset;
}
if (!ce->__call) {
ce->__call = ce->parent->__call;
}
if (!ce->__callstatic) {
ce->__callstatic = ce->parent->__callstatic;
}
if (!ce->__tostring) {
ce->__tostring = ce->parent->__tostring;
}
if (!ce->clone) {
ce->clone = ce->parent->clone;
}
if(!ce->serialize) {
ce->serialize = ce->parent->serialize;
}
if(!ce->unserialize) {
ce->unserialize = ce->parent->unserialize;
}
if (!ce->destructor) {
ce->destructor = ce->parent->destructor;
}
if (!ce->__debugInfo) {
ce->__debugInfo = ce->parent->__debugInfo;
}
if (ce->constructor) {
if (ce->parent->constructor && ce->parent->constructor->common.fn_flags & ZEND_ACC_FINAL) {
zend_error(E_ERROR, "Cannot override final %s::%s() with %s::%s()",
ce->parent->name->val, ce->parent->constructor->common.function_name->val,
ce->name->val, ce->constructor->common.function_name->val
);
}
return;
}
if ((function = zend_hash_str_find_ptr(&ce->parent->function_table, ZEND_CONSTRUCTOR_FUNC_NAME, sizeof(ZEND_CONSTRUCTOR_FUNC_NAME)-1)) != NULL) {
/* inherit parent's constructor */
if (function->type == ZEND_INTERNAL_FUNCTION) {
if (ce->type & ZEND_INTERNAL_CLASS) {
new_function = pemalloc(sizeof(zend_internal_function), 1);
memcpy(new_function, function, sizeof(zend_internal_function));
} else {
new_function = zend_arena_alloc(&CG(arena), sizeof(zend_internal_function));
memcpy(new_function, function, sizeof(zend_internal_function));
new_function->common.fn_flags |= ZEND_ACC_ARENA_ALLOCATED;
}
} else {
new_function = zend_arena_alloc(&CG(arena), sizeof(zend_op_array));
memcpy(new_function, function, sizeof(zend_op_array));
}
zend_hash_str_update_ptr(&ce->function_table, ZEND_CONSTRUCTOR_FUNC_NAME, sizeof(ZEND_CONSTRUCTOR_FUNC_NAME)-1, new_function);
function_add_ref(new_function);
} else {
/* Don't inherit the old style constructor if we already have the new style constructor */
zend_string *lc_class_name;
zend_string *lc_parent_class_name;
lc_class_name = zend_string_tolower(ce->name);
if (!zend_hash_exists(&ce->function_table, lc_class_name)) {
lc_parent_class_name = zend_string_tolower(ce->parent->name);
if (!zend_hash_exists(&ce->function_table, lc_parent_class_name) &&
(function = zend_hash_find_ptr(&ce->parent->function_table, lc_parent_class_name)) != NULL) {
if (function->common.fn_flags & ZEND_ACC_CTOR) {
/* inherit parent's constructor */
if (function->type == ZEND_INTERNAL_FUNCTION) {
if (ce->type & ZEND_INTERNAL_CLASS) {
new_function = pemalloc(sizeof(zend_internal_function), 1);
memcpy(new_function, function, sizeof(zend_internal_function));
} else {
new_function = zend_arena_alloc(&CG(arena), sizeof(zend_internal_function));
memcpy(new_function, function, sizeof(zend_internal_function));
new_function->common.fn_flags |= ZEND_ACC_ARENA_ALLOCATED;
}
} else {
new_function = zend_arena_alloc(&CG(arena), sizeof(zend_op_array));
memcpy(new_function, function, sizeof(zend_op_array));
}
zend_hash_update_ptr(&ce->function_table, lc_parent_class_name, new_function);
function_add_ref(new_function);
}
}
zend_string_release(lc_parent_class_name);
}
zend_string_release(lc_class_name);
}
ce->constructor = ce->parent->constructor;
}
/* }}} */
char *zend_visibility_string(uint32_t fn_flags) /* {{{ */
{
if (fn_flags & ZEND_ACC_PRIVATE) {
return "private";
}
if (fn_flags & ZEND_ACC_PROTECTED) {
return "protected";
}
if (fn_flags & ZEND_ACC_PUBLIC) {
return "public";
}
return "";
}
/* }}} */
static zend_function *do_inherit_method(zend_function *old_function, zend_class_entry *ce) /* {{{ */
{
zend_function *new_function;
if (old_function->type == ZEND_INTERNAL_FUNCTION) {
if (ce->type & ZEND_INTERNAL_CLASS) {
new_function = pemalloc(sizeof(zend_internal_function), 1);
memcpy(new_function, old_function, sizeof(zend_internal_function));
} else {
new_function = zend_arena_alloc(&CG(arena), sizeof(zend_internal_function));
memcpy(new_function, old_function, sizeof(zend_internal_function));
new_function->common.fn_flags |= ZEND_ACC_ARENA_ALLOCATED;
}
} else {
new_function = zend_arena_alloc(&CG(arena), sizeof(zend_op_array));
memcpy(new_function, old_function, sizeof(zend_op_array));
}
/* The class entry of the derived function intentionally remains the same
* as that of the parent class. That allows us to know in which context
* we're running, and handle private method calls properly.
*/
function_add_ref(new_function);
return new_function;
}
/* }}} */
static int zend_do_perform_type_hint_check(const zend_function *fe, zend_arg_info *fe_arg_info, const zend_function *proto, zend_arg_info *proto_arg_info) /* {{{ */
{
if (ZEND_LOG_XOR(fe_arg_info->class_name, proto_arg_info->class_name)) {
/* Only one has a type hint and the other one doesn't */
return 0;
}
if (fe_arg_info->class_name) {
zend_string *fe_class_name, *proto_class_name;
const char *class_name;
if (fe->type == ZEND_INTERNAL_FUNCTION) {
fe_class_name = NULL;
class_name = ((zend_internal_arg_info*)fe_arg_info)->class_name;
} else {
fe_class_name = fe_arg_info->class_name;
class_name = fe_arg_info->class_name->val;
}
if (!strcasecmp(class_name, "parent") && proto->common.scope) {
fe_class_name = zend_string_copy(proto->common.scope->name);
} else if (!strcasecmp(class_name, "self") && fe->common.scope) {
fe_class_name = zend_string_copy(fe->common.scope->name);
} else if (fe_class_name) {
zend_string_addref(fe_class_name);
} else {
fe_class_name = zend_string_init(class_name, strlen(class_name), 0);
}
if (proto->type == ZEND_INTERNAL_FUNCTION) {
proto_class_name = NULL;
class_name = ((zend_internal_arg_info*)proto_arg_info)->class_name;
} else {
proto_class_name = proto_arg_info->class_name;
class_name = proto_arg_info->class_name->val;
}
if (!strcasecmp(class_name, "parent") && proto->common.scope && proto->common.scope->parent) {
proto_class_name = zend_string_copy(proto->common.scope->parent->name);
} else if (!strcasecmp(class_name, "self") && proto->common.scope) {
proto_class_name = zend_string_copy(proto->common.scope->name);
} else if (proto_class_name) {
zend_string_addref(proto_class_name);
} else {
proto_class_name = zend_string_init(class_name, strlen(class_name), 0);
}
if (strcasecmp(fe_class_name->val, proto_class_name->val) != 0) {
const char *colon;
if (fe->common.type != ZEND_USER_FUNCTION) {
zend_string_release(proto_class_name);
zend_string_release(fe_class_name);
return 0;
} else if (strchr(proto_class_name->val, '\\') != NULL ||
(colon = zend_memrchr(fe_class_name->val, '\\', fe_class_name->len)) == NULL ||
strcasecmp(colon+1, proto_class_name->val) != 0) {
zend_class_entry *fe_ce, *proto_ce;
fe_ce = zend_lookup_class(fe_class_name);
proto_ce = zend_lookup_class(proto_class_name);
/* Check for class alias */
if (!fe_ce || !proto_ce ||
fe_ce->type == ZEND_INTERNAL_CLASS ||
proto_ce->type == ZEND_INTERNAL_CLASS ||
fe_ce != proto_ce) {
zend_string_release(proto_class_name);
zend_string_release(fe_class_name);
return 0;
}
}
}
zend_string_release(proto_class_name);
zend_string_release(fe_class_name);
}
if (fe_arg_info->type_hint != proto_arg_info->type_hint) {
/* Incompatible type hint */
return 0;
}
return 1;
}
/* }}} */
static zend_bool zend_do_perform_implementation_check(const zend_function *fe, const zend_function *proto) /* {{{ */
{
uint32_t i, num_args;
/* If it's a user function then arg_info == NULL means we don't have any parameters but
* we still need to do the arg number checks. We are only willing to ignore this for internal
* functions because extensions don't always define arg_info.
*/
if (!proto || (!proto->common.arg_info && proto->common.type != ZEND_USER_FUNCTION)) {
return 1;
}
/* Checks for constructors only if they are declared in an interface,
* or explicitly marked as abstract
*/
if ((fe->common.fn_flags & ZEND_ACC_CTOR)
&& ((proto->common.scope->ce_flags & ZEND_ACC_INTERFACE) == 0
&& (proto->common.fn_flags & ZEND_ACC_ABSTRACT) == 0)) {
return 1;
}
/* If both methods are private do not enforce a signature */
if ((fe->common.fn_flags & ZEND_ACC_PRIVATE) && (proto->common.fn_flags & ZEND_ACC_PRIVATE)) {
return 1;
}
/* check number of arguments */
if (proto->common.required_num_args < fe->common.required_num_args
|| proto->common.num_args > fe->common.num_args) {
return 0;
}
/* by-ref constraints on return values are covariant */
if ((proto->common.fn_flags & ZEND_ACC_RETURN_REFERENCE)
&& !(fe->common.fn_flags & ZEND_ACC_RETURN_REFERENCE)) {
return 0;
}
if ((proto->common.fn_flags & ZEND_ACC_VARIADIC)
&& !(fe->common.fn_flags & ZEND_ACC_VARIADIC)) {
return 0;
}
/* For variadic functions any additional (optional) arguments that were added must be
* checked against the signature of the variadic argument, so in this case we have to
* go through all the parameters of the function and not just those present in the
* prototype. */
num_args = proto->common.num_args;
if (proto->common.fn_flags & ZEND_ACC_VARIADIC) {
num_args++;
if (fe->common.num_args >= proto->common.num_args) {
num_args = fe->common.num_args;
if (fe->common.fn_flags & ZEND_ACC_VARIADIC) {
num_args++;
}
}
}
for (i = 0; i < num_args; i++) {
zend_arg_info *fe_arg_info = &fe->common.arg_info[i];
zend_arg_info *proto_arg_info;
if (i < proto->common.num_args) {
proto_arg_info = &proto->common.arg_info[i];
} else {
proto_arg_info = &proto->common.arg_info[proto->common.num_args];
}
if (!zend_do_perform_type_hint_check(fe, fe_arg_info, proto, proto_arg_info)) {
return 0;
}
/* by-ref constraints on arguments are invariant */
if (fe_arg_info->pass_by_reference != proto_arg_info->pass_by_reference) {
return 0;
}
}
/* check return type compataibility */
if ((proto->common.fn_flags | fe->common.fn_flags) & ZEND_ACC_HAS_RETURN_TYPE) {
if ((proto->common.fn_flags ^ fe->common.fn_flags) & ZEND_ACC_HAS_RETURN_TYPE) {
return 0;
}
if (!zend_do_perform_type_hint_check(fe, fe->common.arg_info - 1, proto, proto->common.arg_info - 1)) {
return 0;
}
}
return 1;
}
/* }}} */
static void zend_append_type_hint(smart_str *str, zend_function *fptr, zend_arg_info *arg_info, int return_hint) /* {{{ */
{
if (arg_info->class_name) {
const char *class_name;
size_t class_name_len;
if (fptr->type == ZEND_INTERNAL_FUNCTION) {
class_name = ((zend_internal_arg_info*)arg_info)->class_name;
class_name_len = strlen(class_name);
} else {
class_name = arg_info->class_name->val;
class_name_len = arg_info->class_name->len;
}
if (!strcasecmp(class_name, "self") && fptr->common.scope) {
class_name = fptr->common.scope->name->val;
class_name_len = fptr->common.scope->name->len;
} else if (!strcasecmp(class_name, "parent") && fptr->common.scope && fptr->common.scope->parent) {
class_name = fptr->common.scope->parent->name->val;
class_name_len = fptr->common.scope->parent->name->len;
}
smart_str_appendl(str, class_name, class_name_len);
if (!return_hint) {
smart_str_appendc(str, ' ');
}
} else if (arg_info->type_hint) {
const char *type_name = zend_get_type_by_const(arg_info->type_hint);
smart_str_appends(str, type_name);
if (!return_hint) {
smart_str_appendc(str, ' ');
}
}
}
/* }}} */
static zend_string *zend_get_function_declaration(zend_function *fptr) /* {{{ */
{
smart_str str = {0};
if (fptr->op_array.fn_flags & ZEND_ACC_RETURN_REFERENCE) {
smart_str_appends(&str, "& ");
}
if (fptr->common.scope) {
smart_str_append(&str, fptr->common.scope->name);
smart_str_appends(&str, "::");
}
smart_str_append(&str, fptr->common.function_name);
smart_str_appendc(&str, '(');
if (fptr->common.arg_info) {
uint32_t i, num_args, required;
zend_arg_info *arg_info = fptr->common.arg_info;
required = fptr->common.required_num_args;
num_args = fptr->common.num_args;
if (fptr->common.fn_flags & ZEND_ACC_VARIADIC) {
num_args++;
}
for (i = 0; i < num_args;) {
zend_append_type_hint(&str, fptr, arg_info, 0);
if (arg_info->pass_by_reference) {
smart_str_appendc(&str, '&');
}
if (arg_info->is_variadic) {
smart_str_appends(&str, "...");
}
smart_str_appendc(&str, '$');
if (arg_info->name) {
if (fptr->type == ZEND_INTERNAL_FUNCTION) {
smart_str_appends(&str, ((zend_internal_arg_info*)arg_info)->name);
} else {
smart_str_appendl(&str, arg_info->name->val, arg_info->name->len);
}
} else {
smart_str_appends(&str, "param");
smart_str_append_unsigned(&str, i);
}
if (i >= required && !arg_info->is_variadic) {
smart_str_appends(&str, " = ");
if (fptr->type == ZEND_USER_FUNCTION) {
zend_op *precv = NULL;
{
uint32_t idx = i;
zend_op *op = fptr->op_array.opcodes;
zend_op *end = op + fptr->op_array.last;
++idx;
while (op < end) {
if ((op->opcode == ZEND_RECV || op->opcode == ZEND_RECV_INIT)
&& op->op1.num == (zend_ulong)idx)
{
precv = op;
}
++op;
}
}
if (precv && precv->opcode == ZEND_RECV_INIT && precv->op2_type != IS_UNUSED) {
zval *zv = RT_CONSTANT(&fptr->op_array, precv->op2);
if (Z_TYPE_P(zv) == IS_CONSTANT) {
smart_str_append(&str, Z_STR_P(zv));
} else if (Z_TYPE_P(zv) == IS_FALSE) {
smart_str_appends(&str, "false");
} else if (Z_TYPE_P(zv) == IS_TRUE) {
smart_str_appends(&str, "true");
} else if (Z_TYPE_P(zv) == IS_NULL) {
smart_str_appends(&str, "NULL");
} else if (Z_TYPE_P(zv) == IS_STRING) {
smart_str_appendc(&str, '\'');
smart_str_appendl(&str, Z_STRVAL_P(zv), MIN(Z_STRLEN_P(zv), 10));
if (Z_STRLEN_P(zv) > 10) {
smart_str_appends(&str, "...");
}
smart_str_appendc(&str, '\'');
} else if (Z_TYPE_P(zv) == IS_ARRAY) {
smart_str_appends(&str, "Array");
} else if (Z_TYPE_P(zv) == IS_CONSTANT_AST) {
smart_str_appends(&str, "<expression>");
} else {
zend_string *zv_str = zval_get_string(zv);
smart_str_append(&str, zv_str);
zend_string_release(zv_str);
}
}
} else {
smart_str_appends(&str, "NULL");
}
}
if (++i < num_args) {
smart_str_appends(&str, ", ");
}
arg_info++;
}
}
smart_str_appendc(&str, ')');
if (fptr->common.fn_flags & ZEND_ACC_HAS_RETURN_TYPE) {
smart_str_appends(&str, ": ");
zend_append_type_hint(&str, fptr, fptr->common.arg_info - 1, 1);
}
smart_str_0(&str);
return str.s;
}
/* }}} */
static void do_inheritance_check_on_method(zend_function *child, zend_function *parent) /* {{{ */
{
uint32_t child_flags;
uint32_t parent_flags = parent->common.fn_flags;
if ((parent->common.scope->ce_flags & ZEND_ACC_INTERFACE) == 0
&& parent->common.fn_flags & ZEND_ACC_ABSTRACT
&& parent->common.scope != (child->common.prototype ? child->common.prototype->common.scope : child->common.scope)
&& child->common.fn_flags & (ZEND_ACC_ABSTRACT|ZEND_ACC_IMPLEMENTED_ABSTRACT)) {
zend_error_noreturn(E_COMPILE_ERROR, "Can't inherit abstract function %s::%s() (previously declared abstract in %s)",
parent->common.scope->name->val,
child->common.function_name->val,
child->common.prototype ? child->common.prototype->common.scope->name->val : child->common.scope->name->val);
}
if (parent_flags & ZEND_ACC_FINAL) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot override final method %s::%s()", ZEND_FN_SCOPE_NAME(parent), child->common.function_name->val);
}
child_flags = child->common.fn_flags;
/* You cannot change from static to non static and vice versa.
*/
if ((child_flags & ZEND_ACC_STATIC) != (parent_flags & ZEND_ACC_STATIC)) {
if (child->common.fn_flags & ZEND_ACC_STATIC) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot make non static method %s::%s() static in class %s", ZEND_FN_SCOPE_NAME(parent), child->common.function_name->val, ZEND_FN_SCOPE_NAME(child));
} else {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot make static method %s::%s() non static in class %s", ZEND_FN_SCOPE_NAME(parent), child->common.function_name->val, ZEND_FN_SCOPE_NAME(child));
}
}
/* Disallow making an inherited method abstract. */
if ((child_flags & ZEND_ACC_ABSTRACT) && !(parent_flags & ZEND_ACC_ABSTRACT)) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot make non abstract method %s::%s() abstract in class %s", ZEND_FN_SCOPE_NAME(parent), child->common.function_name->val, ZEND_FN_SCOPE_NAME(child));
}
if (parent_flags & ZEND_ACC_CHANGED) {
child->common.fn_flags |= ZEND_ACC_CHANGED;
} else {
/* Prevent derived classes from restricting access that was available in parent classes
*/
if ((child_flags & ZEND_ACC_PPP_MASK) > (parent_flags & ZEND_ACC_PPP_MASK)) {
zend_error_noreturn(E_COMPILE_ERROR, "Access level to %s::%s() must be %s (as in class %s)%s", ZEND_FN_SCOPE_NAME(child), child->common.function_name->val, zend_visibility_string(parent_flags), ZEND_FN_SCOPE_NAME(parent), (parent_flags&ZEND_ACC_PUBLIC) ? "" : " or weaker");
} else if (((child_flags & ZEND_ACC_PPP_MASK) < (parent_flags & ZEND_ACC_PPP_MASK))
&& ((parent_flags & ZEND_ACC_PPP_MASK) & ZEND_ACC_PRIVATE)) {
child->common.fn_flags |= ZEND_ACC_CHANGED;
}
}
if (parent_flags & ZEND_ACC_PRIVATE) {
child->common.prototype = NULL;
} else if (parent_flags & ZEND_ACC_ABSTRACT) {
child->common.fn_flags |= ZEND_ACC_IMPLEMENTED_ABSTRACT;
child->common.prototype = parent;
} else if (!(parent->common.fn_flags & ZEND_ACC_CTOR) || (parent->common.prototype && (parent->common.prototype->common.scope->ce_flags & ZEND_ACC_INTERFACE))) {
/* ctors only have a prototype if it comes from an interface */
child->common.prototype = parent->common.prototype ? parent->common.prototype : parent;
}
if (child->common.prototype && (
child->common.prototype->common.fn_flags & (ZEND_ACC_ABSTRACT | ZEND_ACC_HAS_RETURN_TYPE)
)) {
if (!zend_do_perform_implementation_check(child, child->common.prototype)) {
zend_error_noreturn(E_COMPILE_ERROR, "Declaration of %s::%s() must be compatible with %s", ZEND_FN_SCOPE_NAME(child), child->common.function_name->val, zend_get_function_declaration(child->common.prototype)->val);
}
} else if (EG(error_reporting) & E_STRICT || Z_TYPE(EG(user_error_handler)) != IS_UNDEF) { /* Check E_STRICT (or custom error handler) before the check so that we save some time */
if (!zend_do_perform_implementation_check(child, parent)) {
zend_string *method_prototype = zend_get_function_declaration(parent);
zend_error(E_STRICT, "Declaration of %s::%s() should be compatible with %s", ZEND_FN_SCOPE_NAME(child), child->common.function_name->val, method_prototype->val);
zend_string_free(method_prototype);
}
}
}
/* }}} */
static zend_bool do_inherit_method_check(HashTable *child_function_table, zend_function *parent, zend_string *key, zend_class_entry *child_ce) /* {{{ */
{
uint32_t parent_flags = parent->common.fn_flags;
zend_function *child;
if ((child = zend_hash_find_ptr(child_function_table, key)) == NULL) {
if (parent_flags & (ZEND_ACC_ABSTRACT)) {
child_ce->ce_flags |= ZEND_ACC_IMPLICIT_ABSTRACT_CLASS;
}
return 1; /* method doesn't exist in child, copy from parent */
}
do_inheritance_check_on_method(child, parent);
return 0;
}
/* }}} */
static zend_bool do_inherit_property_access_check(zend_property_info *parent_info, zend_string *key, zend_class_entry *ce) /* {{{ */
{
zend_property_info *child_info;
zend_class_entry *parent_ce = ce->parent;
if (parent_info->flags & (ZEND_ACC_PRIVATE|ZEND_ACC_SHADOW)) {
if ((child_info = zend_hash_find_ptr(&ce->properties_info, key)) != NULL) {
child_info->flags |= ZEND_ACC_CHANGED;
} else {
if(ce->type & ZEND_INTERNAL_CLASS) {
child_info = zend_duplicate_property_info_internal(parent_info);
} else {
child_info = zend_duplicate_property_info(parent_info);
}
zend_hash_update_ptr(&ce->properties_info, key, child_info);
child_info->flags &= ~ZEND_ACC_PRIVATE; /* it's not private anymore */
child_info->flags |= ZEND_ACC_SHADOW; /* but it's a shadow of private */
}
return 0; /* don't copy access information to child */
}
if ((child_info = zend_hash_find_ptr(&ce->properties_info, key)) != NULL) {
if ((parent_info->flags & ZEND_ACC_STATIC) != (child_info->flags & ZEND_ACC_STATIC)) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot redeclare %s%s::$%s as %s%s::$%s",
(parent_info->flags & ZEND_ACC_STATIC) ? "static " : "non static ", parent_ce->name->val, key->val,
(child_info->flags & ZEND_ACC_STATIC) ? "static " : "non static ", ce->name->val, key->val);
}
if(parent_info->flags & ZEND_ACC_CHANGED) {
child_info->flags |= ZEND_ACC_CHANGED;
}
if ((child_info->flags & ZEND_ACC_PPP_MASK) > (parent_info->flags & ZEND_ACC_PPP_MASK)) {
zend_error_noreturn(E_COMPILE_ERROR, "Access level to %s::$%s must be %s (as in class %s)%s", ce->name->val, key->val, zend_visibility_string(parent_info->flags), parent_ce->name->val, (parent_info->flags&ZEND_ACC_PUBLIC) ? "" : " or weaker");
} else if ((child_info->flags & ZEND_ACC_STATIC) == 0) {
int parent_num = OBJ_PROP_TO_NUM(parent_info->offset);
int child_num = OBJ_PROP_TO_NUM(child_info->offset);
zval_ptr_dtor(&(ce->default_properties_table[parent_num]));
ce->default_properties_table[parent_num] = ce->default_properties_table[child_num];
ZVAL_UNDEF(&ce->default_properties_table[child_num]);
child_info->offset = parent_info->offset;
}
return 0; /* Don't copy from parent */
} else {
return 1; /* Copy from parent */
}
}
/* }}} */
static inline void do_implement_interface(zend_class_entry *ce, zend_class_entry *iface) /* {{{ */
{
if (!(ce->ce_flags & ZEND_ACC_INTERFACE) && iface->interface_gets_implemented && iface->interface_gets_implemented(iface, ce) == FAILURE) {
zend_error(E_CORE_ERROR, "Class %s could not implement interface %s", ce->name->val, iface->name->val);
}
if (ce == iface) {
zend_error(E_ERROR, "Interface %s cannot implement itself", ce->name->val);
}
}
/* }}} */
ZEND_API void zend_do_inherit_interfaces(zend_class_entry *ce, const zend_class_entry *iface) /* {{{ */
{
/* expects interface to be contained in ce's interface list already */
uint32_t i, ce_num, if_num = iface->num_interfaces;
zend_class_entry *entry;
if (if_num==0) {
return;
}
ce_num = ce->num_interfaces;
if (ce->type == ZEND_INTERNAL_CLASS) {
ce->interfaces = (zend_class_entry **) realloc(ce->interfaces, sizeof(zend_class_entry *) * (ce_num + if_num));
} else {
ce->interfaces = (zend_class_entry **) erealloc(ce->interfaces, sizeof(zend_class_entry *) * (ce_num + if_num));
}
/* Inherit the interfaces, only if they're not already inherited by the class */
while (if_num--) {
entry = iface->interfaces[if_num];
for (i = 0; i < ce_num; i++) {
if (ce->interfaces[i] == entry) {
break;
}
}
if (i == ce_num) {
ce->interfaces[ce->num_interfaces++] = entry;
}
}
/* and now call the implementing handlers */
while (ce_num < ce->num_interfaces) {
do_implement_interface(ce, ce->interfaces[ce_num++]);
}
}
/* }}} */
#ifdef ZTS
# define zval_property_ctor(parent_ce, ce) \
(((parent_ce)->type != (ce)->type) ? ZVAL_COPY_CTOR : zval_add_ref)
#else
# define zval_property_ctor(parent_ce, ce) \
zval_add_ref
#endif
static void do_inherit_class_constant(zend_string *name, zval *zv, zend_class_entry *ce, zend_class_entry *parent_ce) /* {{{ */
{
if (!Z_ISREF_P(zv)) {
if (parent_ce->type == ZEND_INTERNAL_CLASS) {
ZVAL_NEW_PERSISTENT_REF(zv, zv);
} else {
ZVAL_NEW_REF(zv, zv);
}
}
if (Z_CONSTANT_P(Z_REFVAL_P(zv))) {
ce->ce_flags &= ~ZEND_ACC_CONSTANTS_UPDATED;
}
if (zend_hash_add(&ce->constants_table, name, zv)) {
Z_ADDREF_P(zv);
}
}
/* }}} */
ZEND_API void zend_do_inheritance(zend_class_entry *ce, zend_class_entry *parent_ce) /* {{{ */
{
zend_property_info *property_info;
zend_function *func;
zend_string *key;
zval *zv;
if (ce->ce_flags & ZEND_ACC_INTERFACE) {
/* Interface can only inherit other interfaces */
if (!(parent_ce->ce_flags & ZEND_ACC_INTERFACE)) {
zend_error_noreturn(E_COMPILE_ERROR, "Interface %s may not inherit from class (%s)", ce->name->val, parent_ce->name->val);
}
} else {
/* Class declaration must not extend traits or interfaces */
if (parent_ce->ce_flags & ZEND_ACC_INTERFACE) {
zend_error_noreturn(E_COMPILE_ERROR, "Class %s cannot extend from interface %s", ce->name->val, parent_ce->name->val);
} else if (parent_ce->ce_flags & ZEND_ACC_TRAIT) {
zend_error_noreturn(E_COMPILE_ERROR, "Class %s cannot extend from trait %s", ce->name->val, parent_ce->name->val);
}
/* Class must not extend a final class */
if (parent_ce->ce_flags & ZEND_ACC_FINAL) {
zend_error_noreturn(E_COMPILE_ERROR, "Class %s may not inherit from final class (%s)", ce->name->val, parent_ce->name->val);
}
}
ce->parent = parent_ce;
/* Copy serialize/unserialize callbacks */
if (!ce->serialize) {
ce->serialize = parent_ce->serialize;
}
if (!ce->unserialize) {
ce->unserialize = parent_ce->unserialize;
}
/* Inherit interfaces */
zend_do_inherit_interfaces(ce, parent_ce);
/* Inherit properties */
if (parent_ce->default_properties_count) {
int i = ce->default_properties_count + parent_ce->default_properties_count;
ce->default_properties_table = perealloc(ce->default_properties_table, sizeof(zval) * i, ce->type == ZEND_INTERNAL_CLASS);
if (ce->default_properties_count) {
while (i-- > parent_ce->default_properties_count) {
ce->default_properties_table[i] = ce->default_properties_table[i - parent_ce->default_properties_count];
}
}
for (i = 0; i < parent_ce->default_properties_count; i++) {
#ifdef ZTS
if (parent_ce->type != ce->type) {
ZVAL_DUP(&ce->default_properties_table[i], &parent_ce->default_properties_table[i]);
if (Z_OPT_CONSTANT(ce->default_properties_table[i])) {
ce->ce_flags &= ~ZEND_ACC_CONSTANTS_UPDATED;
}
continue;
}
#endif
ZVAL_COPY(&ce->default_properties_table[i], &parent_ce->default_properties_table[i]);
if (Z_OPT_CONSTANT(ce->default_properties_table[i])) {
ce->ce_flags &= ~ZEND_ACC_CONSTANTS_UPDATED;
}
}
ce->default_properties_count += parent_ce->default_properties_count;
}
if (parent_ce->type != ce->type) {
/* User class extends internal class */
zend_update_class_constants(parent_ce );
if (parent_ce->default_static_members_count) {
int i = ce->default_static_members_count + parent_ce->default_static_members_count;
ce->default_static_members_table = erealloc(ce->default_static_members_table, sizeof(zval) * i);
if (ce->default_static_members_count) {
while (i-- > parent_ce->default_static_members_count) {
ce->default_static_members_table[i] = ce->default_static_members_table[i - parent_ce->default_static_members_count];
}
}
for (i = 0; i < parent_ce->default_static_members_count; i++) {
ZVAL_MAKE_REF(&CE_STATIC_MEMBERS(parent_ce)[i]);
ce->default_static_members_table[i] = CE_STATIC_MEMBERS(parent_ce)[i];
Z_ADDREF(ce->default_static_members_table[i]);
if (Z_CONSTANT_P(Z_REFVAL(ce->default_static_members_table[i]))) {
ce->ce_flags &= ~ZEND_ACC_CONSTANTS_UPDATED;
}
}
ce->default_static_members_count += parent_ce->default_static_members_count;
ce->static_members_table = ce->default_static_members_table;
}
} else {
if (parent_ce->default_static_members_count) {
int i = ce->default_static_members_count + parent_ce->default_static_members_count;
ce->default_static_members_table = perealloc(ce->default_static_members_table, sizeof(zval) * i, ce->type == ZEND_INTERNAL_CLASS);
if (ce->default_static_members_count) {
while (i-- > parent_ce->default_static_members_count) {
ce->default_static_members_table[i] = ce->default_static_members_table[i - parent_ce->default_static_members_count];
}
}
for (i = 0; i < parent_ce->default_static_members_count; i++) {
ZVAL_MAKE_REF(&parent_ce->default_static_members_table[i]);
ce->default_static_members_table[i] = parent_ce->default_static_members_table[i];
Z_ADDREF(ce->default_static_members_table[i]);
if (Z_CONSTANT_P(Z_REFVAL(ce->default_static_members_table[i]))) {
ce->ce_flags &= ~ZEND_ACC_CONSTANTS_UPDATED;
}
}
ce->default_static_members_count += parent_ce->default_static_members_count;
if (ce->type == ZEND_USER_CLASS) {
ce->static_members_table = ce->default_static_members_table;
}
}
}
ZEND_HASH_FOREACH_PTR(&ce->properties_info, property_info) {
if (property_info->ce == ce) {
if (property_info->flags & ZEND_ACC_STATIC) {
property_info->offset += parent_ce->default_static_members_count;
} else {
property_info->offset += parent_ce->default_properties_count * sizeof(zval);
}
}
} ZEND_HASH_FOREACH_END();
ZEND_HASH_FOREACH_STR_KEY_PTR(&parent_ce->properties_info, key, property_info) {
if (do_inherit_property_access_check(property_info, key, ce)) {
if (ce->type & ZEND_INTERNAL_CLASS) {
property_info = zend_duplicate_property_info_internal(property_info);
} else {
property_info = zend_duplicate_property_info(property_info);
}
zend_hash_add_new_ptr(&ce->properties_info, key, property_info);
}
} ZEND_HASH_FOREACH_END();
ZEND_HASH_FOREACH_STR_KEY_VAL(&parent_ce->constants_table, key, zv) {
do_inherit_class_constant(key, zv, ce, parent_ce);
} ZEND_HASH_FOREACH_END();
ZEND_HASH_FOREACH_STR_KEY_PTR(&parent_ce->function_table, key, func) {
if (do_inherit_method_check(&ce->function_table, func, key, ce)) {
zend_function *new_func = do_inherit_method(func, ce);
zend_hash_add_new_ptr(&ce->function_table, key, new_func);
}
} ZEND_HASH_FOREACH_END();
do_inherit_parent_constructor(ce);
if (ce->ce_flags & ZEND_ACC_IMPLICIT_ABSTRACT_CLASS && ce->type == ZEND_INTERNAL_CLASS) {
ce->ce_flags |= ZEND_ACC_EXPLICIT_ABSTRACT_CLASS;
} else if (!(ce->ce_flags & (ZEND_ACC_IMPLEMENT_INTERFACES|ZEND_ACC_IMPLEMENT_TRAITS))) {
/* The verification will be done in runtime by ZEND_VERIFY_ABSTRACT_CLASS */
zend_verify_abstract_class(ce);
}
ce->ce_flags |= parent_ce->ce_flags & (ZEND_HAS_STATIC_IN_METHODS | ZEND_ACC_USE_GUARDS);
}
/* }}} */
static zend_bool do_inherit_constant_check(HashTable *child_constants_table, zval *parent_constant, zend_string *name, const zend_class_entry *iface) /* {{{ */
{
zval *old_constant;
if ((old_constant = zend_hash_find(child_constants_table, name)) != NULL) {
if (!Z_ISREF_P(old_constant) ||
!Z_ISREF_P(parent_constant) ||
Z_REFVAL_P(old_constant) != Z_REFVAL_P(parent_constant)) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot inherit previously-inherited or override constant %s from interface %s", name->val, iface->name->val);
}
return 0;
}
return 1;
}
/* }}} */
static void do_inherit_iface_constant(zend_string *name, zval *zv, zend_class_entry *ce, zend_class_entry *iface) /* {{{ */
{
if (do_inherit_constant_check(&ce->constants_table, zv, name, iface)) {
ZVAL_MAKE_REF(zv);
Z_ADDREF_P(zv);
if (Z_CONSTANT_P(Z_REFVAL_P(zv))) {
ce->ce_flags &= ~ZEND_ACC_CONSTANTS_UPDATED;
}
zend_hash_update(&ce->constants_table, name, zv);
}
}
/* }}} */
ZEND_API void zend_do_implement_interface(zend_class_entry *ce, zend_class_entry *iface) /* {{{ */
{
uint32_t i, ignore = 0;
uint32_t current_iface_num = ce->num_interfaces;
uint32_t parent_iface_num = ce->parent ? ce->parent->num_interfaces : 0;
zend_function *func;
zend_string *key;
zval *zv;
for (i = 0; i < ce->num_interfaces; i++) {
if (ce->interfaces[i] == NULL) {
memmove(ce->interfaces + i, ce->interfaces + i + 1, sizeof(zend_class_entry*) * (--ce->num_interfaces - i));
i--;
} else if (ce->interfaces[i] == iface) {
if (i < parent_iface_num) {
ignore = 1;
} else {
zend_error_noreturn(E_COMPILE_ERROR, "Class %s cannot implement previously implemented interface %s", ce->name->val, iface->name->val);
}
}
}
if (ignore) {
/* Check for attempt to redeclare interface constants */
ZEND_HASH_FOREACH_STR_KEY_VAL(&ce->constants_table, key, zv) {
do_inherit_constant_check(&iface->constants_table, zv, key, iface);
} ZEND_HASH_FOREACH_END();
} else {
if (ce->num_interfaces >= current_iface_num) {
if (ce->type == ZEND_INTERNAL_CLASS) {
ce->interfaces = (zend_class_entry **) realloc(ce->interfaces, sizeof(zend_class_entry *) * (++current_iface_num));
} else {
ce->interfaces = (zend_class_entry **) erealloc(ce->interfaces, sizeof(zend_class_entry *) * (++current_iface_num));
}
}
ce->interfaces[ce->num_interfaces++] = iface;
ZEND_HASH_FOREACH_STR_KEY_VAL(&iface->constants_table, key, zv) {
do_inherit_iface_constant(key, zv, ce, iface);
} ZEND_HASH_FOREACH_END();
ZEND_HASH_FOREACH_STR_KEY_PTR(&iface->function_table, key, func) {
if (do_inherit_method_check(&ce->function_table, func, key, ce)) {
zend_function *new_func = do_inherit_method(func, ce);
zend_hash_add_new_ptr(&ce->function_table, key, new_func);
}
} ZEND_HASH_FOREACH_END();
do_implement_interface(ce, iface);
zend_do_inherit_interfaces(ce, iface);