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zend_inheritance.c
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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2018 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"
#include "zend_operators.h"
static void overridden_ptr_dtor(zval *zv) /* {{{ */
{
efree_size(Z_PTR_P(zv), sizeof(zend_function));
}
/* }}} */
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 zend_function *zend_duplicate_function(zend_function *func, zend_class_entry *ce) /* {{{ */
{
zend_function *new_function;
if (UNEXPECTED(func->type == ZEND_INTERNAL_FUNCTION)) {
if (UNEXPECTED(ce->type & ZEND_INTERNAL_CLASS)) {
new_function = pemalloc(sizeof(zend_internal_function), 1);
memcpy(new_function, func, sizeof(zend_internal_function));
} else {
new_function = zend_arena_alloc(&CG(arena), sizeof(zend_internal_function));
memcpy(new_function, func, sizeof(zend_internal_function));
new_function->common.fn_flags |= ZEND_ACC_ARENA_ALLOCATED;
}
if (EXPECTED(new_function->common.function_name)) {
zend_string_addref(new_function->common.function_name);
}
} else {
if (func->op_array.refcount) {
(*func->op_array.refcount)++;
}
if (EXPECTED(!func->op_array.static_variables)) {
/* reuse the same op_array structure */
return func;
}
new_function = zend_arena_alloc(&CG(arena), sizeof(zend_op_array));
memcpy(new_function, func, sizeof(zend_op_array));
if (ZEND_MAP_PTR_GET(func->op_array.static_variables_ptr)) {
/* See: Zend/tests/method_static_var.phpt */
new_function->op_array.static_variables = ZEND_MAP_PTR_GET(func->op_array.static_variables_ptr);
}
if (!(GC_FLAGS(new_function->op_array.static_variables) & IS_ARRAY_IMMUTABLE)) {
GC_ADDREF(new_function->op_array.static_variables);
}
ZEND_MAP_PTR_INIT(new_function->op_array.static_variables_ptr, &new_function->op_array.static_variables);
}
return new_function;
}
/* }}} */
static void do_inherit_parent_constructor(zend_class_entry *ce) /* {{{ */
{
zend_class_entry *parent = ce->parent;
ZEND_ASSERT(parent != NULL);
/* You cannot change create_object */
ce->create_object = parent->create_object;
/* Inherit special functions if needed */
if (EXPECTED(!ce->get_iterator)) {
ce->get_iterator = parent->get_iterator;
}
if (parent->iterator_funcs_ptr) {
/* Must be initialized through iface->interface_gets_implemented() */
ZEND_ASSERT(ce->iterator_funcs_ptr);
}
if (EXPECTED(!ce->__get)) {
ce->__get = parent->__get;
}
if (EXPECTED(!ce->__set)) {
ce->__set = parent->__set;
}
if (EXPECTED(!ce->__unset)) {
ce->__unset = parent->__unset;
}
if (EXPECTED(!ce->__isset)) {
ce->__isset = parent->__isset;
}
if (EXPECTED(!ce->__call)) {
ce->__call = parent->__call;
}
if (EXPECTED(!ce->__callstatic)) {
ce->__callstatic = parent->__callstatic;
}
if (EXPECTED(!ce->__tostring)) {
ce->__tostring = parent->__tostring;
}
if (EXPECTED(!ce->clone)) {
ce->clone = parent->clone;
}
if (EXPECTED(!ce->serialize)) {
ce->serialize = parent->serialize;
}
if (EXPECTED(!ce->unserialize)) {
ce->unserialize = parent->unserialize;
}
if (!ce->destructor) {
ce->destructor = parent->destructor;
}
if (EXPECTED(!ce->__debugInfo)) {
ce->__debugInfo = parent->__debugInfo;
}
if (ce->constructor) {
if (parent->constructor && UNEXPECTED(parent->constructor->common.fn_flags & ZEND_ACC_FINAL)) {
zend_error_noreturn(E_ERROR, "Cannot override final %s::%s() with %s::%s()",
ZSTR_VAL(parent->name), ZSTR_VAL(parent->constructor->common.function_name),
ZSTR_VAL(ce->name), ZSTR_VAL(ce->constructor->common.function_name));
}
return;
}
ce->constructor = parent->constructor;
}
/* }}} */
char *zend_visibility_string(uint32_t fn_flags) /* {{{ */
{
if (fn_flags & ZEND_ACC_PUBLIC) {
return "public";
} else if (fn_flags & ZEND_ACC_PRIVATE) {
return "private";
} else {
ZEND_ASSERT(fn_flags & ZEND_ACC_PROTECTED);
return "protected";
}
}
/* }}} */
static zend_always_inline zend_bool zend_iterable_compatibility_check(zend_arg_info *arg_info) /* {{{ */
{
if (ZEND_TYPE_CODE(arg_info->type) == IS_ARRAY) {
return 1;
}
if (ZEND_TYPE_IS_CLASS(arg_info->type) && zend_string_equals_literal_ci(ZEND_TYPE_NAME(arg_info->type), "Traversable")) {
return 1;
}
return 0;
}
/* }}} */
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) /* {{{ */
{
ZEND_ASSERT(ZEND_TYPE_IS_SET(fe_arg_info->type) && ZEND_TYPE_IS_SET(proto_arg_info->type));
if (ZEND_TYPE_IS_CLASS(fe_arg_info->type) && ZEND_TYPE_IS_CLASS(proto_arg_info->type)) {
zend_string *fe_class_name, *proto_class_name;
const char *class_name;
size_t class_name_len;
fe_class_name = ZEND_TYPE_NAME(fe_arg_info->type);
class_name = ZSTR_VAL(fe_class_name);
class_name_len = ZSTR_LEN(fe_class_name);
if (class_name_len == sizeof("parent")-1 && !strcasecmp(class_name, "parent") && proto->common.scope) {
fe_class_name = zend_string_copy(proto->common.scope->name);
} else if (class_name_len == sizeof("self")-1 && !strcasecmp(class_name, "self") && fe->common.scope) {
fe_class_name = zend_string_copy(fe->common.scope->name);
} else {
zend_string_addref(fe_class_name);
}
proto_class_name = ZEND_TYPE_NAME(proto_arg_info->type);
class_name = ZSTR_VAL(proto_class_name);
class_name_len = ZSTR_LEN(proto_class_name);
if (class_name_len == sizeof("parent")-1 && !strcasecmp(class_name, "parent") && proto->common.scope && proto->common.scope->parent) {
proto_class_name = zend_string_copy(proto->common.scope->parent->name);
} else if (class_name_len == sizeof("self")-1 && !strcasecmp(class_name, "self") && proto->common.scope) {
proto_class_name = zend_string_copy(proto->common.scope->name);
} else {
zend_string_addref(proto_class_name);
}
if (fe_class_name != proto_class_name && strcasecmp(ZSTR_VAL(fe_class_name), ZSTR_VAL(proto_class_name)) != 0) {
if (fe->common.type != ZEND_USER_FUNCTION) {
zend_string_release(proto_class_name);
zend_string_release(fe_class_name);
return 0;
} else {
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);
} else if (ZEND_TYPE_CODE(fe_arg_info->type) != ZEND_TYPE_CODE(proto_arg_info->type)) {
/* Incompatible built-in types */
return 0;
}
return 1;
}
/* }}} */
static int zend_do_perform_arg_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_TYPE_IS_SET(fe_arg_info->type)) {
/* Child with no type is always compatible */
return 1;
}
if (!ZEND_TYPE_IS_SET(proto_arg_info->type)) {
/* Child defines a type, but parent doesn't, violates LSP */
return 0;
}
return zend_do_perform_type_hint_check(fe, fe_arg_info, proto, proto_arg_info);
}
/* }}} */
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->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.scope->constructor == fe)
&& ((proto->common.scope->ce_flags & ZEND_ACC_INTERFACE) == 0
&& (proto->common.fn_flags & ZEND_ACC_ABSTRACT) == 0)) {
return 1;
}
/* If the prototype method is private do not enforce a signature */
if (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_arg_type_hint_check(fe, fe_arg_info, proto, proto_arg_info)) {
switch (ZEND_TYPE_CODE(fe_arg_info->type)) {
case IS_ITERABLE:
if (!zend_iterable_compatibility_check(proto_arg_info)) {
return 0;
}
break;
default:
return 0;
}
}
// This introduces BC break described at https://bugs.php.net/bug.php?id=72119
if (ZEND_TYPE_IS_SET(proto_arg_info->type) && ZEND_TYPE_ALLOW_NULL(proto_arg_info->type) && !ZEND_TYPE_ALLOW_NULL(fe_arg_info->type)) {
/* incompatible nullability */
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 compatibility, but only if the prototype already specifies
* a return type. Adding a new return type is always valid. */
if (proto->common.fn_flags & ZEND_ACC_HAS_RETURN_TYPE) {
/* Removing a return type is not valid. */
if (!(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)) {
switch (ZEND_TYPE_CODE(proto->common.arg_info[-1].type)) {
case IS_ITERABLE:
if (!zend_iterable_compatibility_check(fe->common.arg_info - 1)) {
return 0;
}
break;
default:
return 0;
}
}
if (ZEND_TYPE_ALLOW_NULL(fe->common.arg_info[-1].type) && !ZEND_TYPE_ALLOW_NULL(proto->common.arg_info[-1].type)) {
return 0;
}
}
return 1;
}
/* }}} */
static ZEND_COLD void zend_append_type_hint(smart_str *str, const zend_function *fptr, zend_arg_info *arg_info, int return_hint) /* {{{ */
{
if (ZEND_TYPE_IS_SET(arg_info->type) && ZEND_TYPE_ALLOW_NULL(arg_info->type)) {
smart_str_appendc(str, '?');
}
if (ZEND_TYPE_IS_CLASS(arg_info->type)) {
const char *class_name;
size_t class_name_len;
class_name = ZSTR_VAL(ZEND_TYPE_NAME(arg_info->type));
class_name_len = ZSTR_LEN(ZEND_TYPE_NAME(arg_info->type));
if (!strcasecmp(class_name, "self") && fptr->common.scope) {
class_name = ZSTR_VAL(fptr->common.scope->name);
class_name_len = ZSTR_LEN(fptr->common.scope->name);
} else if (!strcasecmp(class_name, "parent") && fptr->common.scope && fptr->common.scope->parent) {
class_name = ZSTR_VAL(fptr->common.scope->parent->name);
class_name_len = ZSTR_LEN(fptr->common.scope->parent->name);
}
smart_str_appendl(str, class_name, class_name_len);
if (!return_hint) {
smart_str_appendc(str, ' ');
}
} else if (ZEND_TYPE_IS_CODE(arg_info->type)) {
const char *type_name = zend_get_type_by_const(ZEND_TYPE_CODE(arg_info->type));
smart_str_appends(str, type_name);
if (!return_hint) {
smart_str_appendc(str, ' ');
}
}
}
/* }}} */
static ZEND_COLD zend_string *zend_get_function_declaration(const 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) {
/* cut off on NULL byte ... class@anonymous */
smart_str_appendl(&str, ZSTR_VAL(fptr->common.scope->name), strlen(ZSTR_VAL(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, ZSTR_VAL(arg_info->name), ZSTR_LEN(arg_info->name));
}
} 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(precv, precv->op2);
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) {
zend_ast *ast = Z_ASTVAL_P(zv);
if (ast->kind == ZEND_AST_CONSTANT) {
smart_str_append(&str, zend_ast_get_constant_name(ast));
} else {
smart_str_appends(&str, "<expression>");
}
} else {
zend_string *tmp_zv_str;
zend_string *zv_str = zval_get_tmp_string(zv, &tmp_zv_str);
smart_str_append(&str, zv_str);
zend_tmp_string_release(tmp_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, zend_class_entry *ce, zval *child_zv) /* {{{ */
{
uint32_t child_flags;
uint32_t parent_flags = parent->common.fn_flags;
if (UNEXPECTED(parent_flags & ZEND_ACC_FINAL)) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot override final method %s::%s()", ZEND_FN_SCOPE_NAME(parent), ZSTR_VAL(child->common.function_name));
}
child_flags = child->common.fn_flags;
/* You cannot change from static to non static and vice versa.
*/
if (UNEXPECTED((child_flags & ZEND_ACC_STATIC) != (parent_flags & ZEND_ACC_STATIC))) {
if (child_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), ZSTR_VAL(child->common.function_name), 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), ZSTR_VAL(child->common.function_name), ZEND_FN_SCOPE_NAME(child));
}
}
/* Disallow making an inherited method abstract. */
if (UNEXPECTED((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), ZSTR_VAL(child->common.function_name), ZEND_FN_SCOPE_NAME(child));
}
if (parent_flags & (ZEND_ACC_PRIVATE|ZEND_ACC_CHANGED)) {
child->common.fn_flags |= ZEND_ACC_CHANGED;
}
do {
if (!(parent_flags & ZEND_ACC_PRIVATE)) {
zend_function *proto = parent->common.prototype ?
parent->common.prototype : parent;
if (parent->common.scope->constructor != parent) {
if (!proto) {
proto = parent;
}
} else if (proto) {
if (proto->common.scope->ce_flags & ZEND_ACC_INTERFACE) {
/* ctors only have a prototype if it comes from an interface */
/* and if that is the case, we want to check inheritance against it */
parent = proto;
} else if (!(proto->common.fn_flags & ZEND_ACC_ABSTRACT)) {
break;
}
} else {
break;
}
if (child_zv && child->common.prototype != proto) {
do {
if (child->common.scope != ce
&& child->type == ZEND_USER_FUNCTION
&& !child->op_array.static_variables) {
if (ce->ce_flags & ZEND_ACC_INTERFACE) {
/* Few parent interfaces contain the same method */
break;
} else {
/* op_array wasn't duplicated yet */
zend_function *new_function = zend_arena_alloc(&CG(arena), sizeof(zend_op_array));
memcpy(new_function, child, sizeof(zend_op_array));
Z_PTR_P(child_zv) = child = new_function;
}
}
child->common.prototype = proto;
} while (0);
}
/* Prevent derived classes from restricting access that was available in parent classes (except deriving from non-abstract ctors) */
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), ZSTR_VAL(child->common.function_name), zend_visibility_string(parent_flags), ZEND_FN_SCOPE_NAME(parent), (parent_flags&ZEND_ACC_PUBLIC) ? "" : " or weaker");
}
if (UNEXPECTED(!zend_do_perform_implementation_check(child, parent))) {
int error_level;
const char *error_verb;
zend_string *method_prototype = zend_get_function_declaration(parent);
zend_string *child_prototype = zend_get_function_declaration(child);
if (child->common.prototype && (
child->common.prototype->common.fn_flags & ZEND_ACC_ABSTRACT
)) {
error_level = E_COMPILE_ERROR;
error_verb = "must";
} else if ((parent->common.fn_flags & ZEND_ACC_HAS_RETURN_TYPE) &&
(!(child->common.fn_flags & ZEND_ACC_HAS_RETURN_TYPE) ||
!zend_do_perform_type_hint_check(child, child->common.arg_info - 1, parent, parent->common.arg_info - 1) ||
(ZEND_TYPE_ALLOW_NULL(child->common.arg_info[-1].type) && !ZEND_TYPE_ALLOW_NULL(parent->common.arg_info[-1].type)))) {
error_level = E_COMPILE_ERROR;
error_verb = "must";
} else {
error_level = E_WARNING;
error_verb = "should";
}
zend_error(error_level, "Declaration of %s %s be compatible with %s", ZSTR_VAL(child_prototype), error_verb, ZSTR_VAL(method_prototype));
zend_string_efree(child_prototype);
zend_string_efree(method_prototype);
}
}
} while (0);
}
/* }}} */
static zend_function *do_inherit_method(zend_string *key, zend_function *parent, zend_class_entry *ce) /* {{{ */
{
zval *child = zend_hash_find_ex(&ce->function_table, key, 1);
if (child) {
zend_function *func = (zend_function*)Z_PTR_P(child);
if (UNEXPECTED(func == parent)) {
/* The same method in interface may be inherited few times */
return NULL;
}
do_inheritance_check_on_method(func, parent, ce, child);
return NULL;
}
if (parent->common.fn_flags & (ZEND_ACC_ABSTRACT)) {
ce->ce_flags |= ZEND_ACC_IMPLICIT_ABSTRACT_CLASS;
}
return zend_duplicate_function(parent, ce);
}
/* }}} */
static void do_inherit_property(zend_property_info *parent_info, zend_string *key, zend_class_entry *ce) /* {{{ */
{
zval *child = zend_hash_find_ex(&ce->properties_info, key, 1);
zend_property_info *child_info;
if (UNEXPECTED(child)) {
child_info = Z_PTR_P(child);
if (parent_info->flags & (ZEND_ACC_PRIVATE|ZEND_ACC_CHANGED)) {
child_info->flags |= ZEND_ACC_CHANGED;
}
if (!(parent_info->flags & ZEND_ACC_PRIVATE)) {
if (UNEXPECTED((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::$%s",
(parent_info->flags & ZEND_ACC_STATIC) ? "static " : "non static ", ZSTR_VAL(ce->parent->name), ZSTR_VAL(key),
(child_info->flags & ZEND_ACC_STATIC) ? "static " : "non static ", ZSTR_VAL(ce->name), ZSTR_VAL(key));
}
if (UNEXPECTED((child_info->flags & ZEND_ACC_PPP_MASK) > (parent_info->flags & ZEND_ACC_PPP_MASK))) {
zend_error_noreturn(E_COMPILE_ERROR, "Access level to %s::$%s must be %s (as in class %s)%s", ZSTR_VAL(ce->name), ZSTR_VAL(key), zend_visibility_string(parent_info->flags), ZSTR_VAL(ce->parent->name), (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);
/* Don't keep default properties in GC (they may be freed by opcache) */
zval_ptr_dtor_nogc(&(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;
}
}
} else {
if (UNEXPECTED(ce->type & ZEND_INTERNAL_CLASS)) {
child_info = zend_duplicate_property_info_internal(parent_info);
} else {
child_info = parent_info;
}
_zend_hash_append_ptr(&ce->properties_info, key, child_info);
}
}
/* }}} */
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_noreturn(E_CORE_ERROR, "Class %s could not implement interface %s", ZSTR_VAL(ce->name), ZSTR_VAL(iface->name));
}
if (UNEXPECTED(ce == iface)) {
zend_error_noreturn(E_ERROR, "Interface %s cannot implement itself", ZSTR_VAL(ce->name));
}
}
/* }}} */
static 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;
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++]);
}
}
/* }}} */
static void do_inherit_class_constant(zend_string *name, zend_class_constant *parent_const, zend_class_entry *ce) /* {{{ */
{
zval *zv = zend_hash_find_ex(&ce->constants_table, name, 1);
zend_class_constant *c;
if (zv != NULL) {
c = (zend_class_constant*)Z_PTR_P(zv);
if (UNEXPECTED((Z_ACCESS_FLAGS(c->value) & ZEND_ACC_PPP_MASK) > (Z_ACCESS_FLAGS(parent_const->value) & ZEND_ACC_PPP_MASK))) {
zend_error_noreturn(E_COMPILE_ERROR, "Access level to %s::%s must be %s (as in class %s)%s",
ZSTR_VAL(ce->name), ZSTR_VAL(name), zend_visibility_string(Z_ACCESS_FLAGS(parent_const->value)), ZSTR_VAL(ce->parent->name), (Z_ACCESS_FLAGS(parent_const->value) & ZEND_ACC_PUBLIC) ? "" : " or weaker");
}
} else if (!(Z_ACCESS_FLAGS(parent_const->value) & ZEND_ACC_PRIVATE)) {
if (Z_TYPE(parent_const->value) == IS_CONSTANT_AST) {
ce->ce_flags &= ~ZEND_ACC_CONSTANTS_UPDATED;
}
if (ce->type & ZEND_INTERNAL_CLASS) {
c = pemalloc(sizeof(zend_class_constant), 1);
memcpy(c, parent_const, sizeof(zend_class_constant));
parent_const = c;
}
_zend_hash_append_ptr(&ce->constants_table, name, parent_const);
}
}
/* }}} */
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;
if (UNEXPECTED(ce->ce_flags & ZEND_ACC_INTERFACE)) {
/* Interface can only inherit other interfaces */
if (UNEXPECTED(!(parent_ce->ce_flags & ZEND_ACC_INTERFACE))) {
zend_error_noreturn(E_COMPILE_ERROR, "Interface %s may not inherit from class (%s)", ZSTR_VAL(ce->name), ZSTR_VAL(parent_ce->name));
}
} else if (UNEXPECTED(parent_ce->ce_flags & (ZEND_ACC_INTERFACE|ZEND_ACC_TRAIT|ZEND_ACC_FINAL))) {
/* 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", ZSTR_VAL(ce->name), ZSTR_VAL(parent_ce->name));
} else if (parent_ce->ce_flags & ZEND_ACC_TRAIT) {
zend_error_noreturn(E_COMPILE_ERROR, "Class %s cannot extend from trait %s", ZSTR_VAL(ce->name), ZSTR_VAL(parent_ce->name));
}
/* 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)", ZSTR_VAL(ce->name), ZSTR_VAL(parent_ce->name));
}
}
if (ce->parent_name) {
zend_string_release_ex(ce->parent_name, 0);
}
ce->parent = parent_ce;
/* Inherit interfaces */
if (parent_ce->num_interfaces) {
if (!(ce->ce_flags & ZEND_ACC_IMPLEMENT_INTERFACES)) {
zend_do_inherit_interfaces(ce, parent_ce);
} else {
uint32_t i;
for (i = 0; i < parent_ce->num_interfaces; i++) {
do_implement_interface(ce, parent_ce->interfaces[i]);
}
}
}
/* Inherit properties */
if (parent_ce->default_properties_count) {
zval *src, *dst, *end;
if (ce->default_properties_count) {
zval *table = pemalloc(sizeof(zval) * (ce->default_properties_count + parent_ce->default_properties_count), ce->type == ZEND_INTERNAL_CLASS);
src = ce->default_properties_table + ce->default_properties_count;
end = table + parent_ce->default_properties_count;
dst = end + ce->default_properties_count;
ce->default_properties_table = table;
do {
dst--;
src--;
ZVAL_COPY_VALUE(dst, src);
} while (dst != end);
pefree(src, ce->type == ZEND_INTERNAL_CLASS);
end = ce->default_properties_table;
} else {
end = pemalloc(sizeof(zval) * parent_ce->default_properties_count, ce->type == ZEND_INTERNAL_CLASS);
dst = end + parent_ce->default_properties_count;
ce->default_properties_table = end;
}
src = parent_ce->default_properties_table + parent_ce->default_properties_count;
if (UNEXPECTED(parent_ce->type != ce->type)) {
/* User class extends internal */
do {
dst--;
src--;
ZVAL_COPY_OR_DUP(dst, src);
if (Z_OPT_TYPE_P(dst) == IS_CONSTANT_AST) {
ce->ce_flags &= ~ZEND_ACC_CONSTANTS_UPDATED;
}
continue;
} while (dst != end);
} else {
do {
dst--;
src--;
ZVAL_COPY(dst, src);
if (Z_OPT_TYPE_P(dst) == IS_CONSTANT_AST) {
ce->ce_flags &= ~ZEND_ACC_CONSTANTS_UPDATED;
}
continue;
} while (dst != end);
}
ce->default_properties_count += parent_ce->default_properties_count;
}
if (parent_ce->default_static_members_count) {
zval *src, *dst, *end;
if (ce->default_static_members_count) {
zval *table = pemalloc(sizeof(zval) * (ce->default_static_members_count + parent_ce->default_static_members_count), ce->type == ZEND_INTERNAL_CLASS);
src = ce->default_static_members_table + ce->default_static_members_count;
end = table + parent_ce->default_static_members_count;
dst = end + ce->default_static_members_count;
ce->default_static_members_table = table;
do {
dst--;
src--;
ZVAL_COPY_VALUE(dst, src);
} while (dst != end);
pefree(src, ce->type == ZEND_INTERNAL_CLASS);
end = ce->default_static_members_table;
} else {
end = pemalloc(sizeof(zval) * parent_ce->default_static_members_count, ce->type == ZEND_INTERNAL_CLASS);
dst = end + parent_ce->default_static_members_count;
ce->default_static_members_table = end;
}
if (UNEXPECTED(parent_ce->type != ce->type)) {
/* User class extends internal */
if (CE_STATIC_MEMBERS(parent_ce) == NULL) {
zend_class_init_statics(parent_ce);
}
if (UNEXPECTED(zend_update_class_constants(parent_ce) != SUCCESS)) {
ZEND_ASSERT(0);
}
src = CE_STATIC_MEMBERS(parent_ce) + parent_ce->default_static_members_count;
do {
dst--;
src--;
if (Z_TYPE_P(src) == IS_INDIRECT) {
ZVAL_INDIRECT(dst, Z_INDIRECT_P(src));
} else {
ZVAL_INDIRECT(dst, src);
}
} while (dst != end);
} else if (ce->type == ZEND_USER_CLASS) {
if (CE_STATIC_MEMBERS(parent_ce) == NULL) {
ZEND_ASSERT(parent_ce->ce_flags & ZEND_ACC_IMMUTABLE);
zend_class_init_statics(parent_ce);
}
src = CE_STATIC_MEMBERS(parent_ce) + parent_ce->default_static_members_count;
do {
dst--;
src--;
if (Z_TYPE_P(src) == IS_INDIRECT) {
ZVAL_INDIRECT(dst, Z_INDIRECT_P(src));
} else {
ZVAL_INDIRECT(dst, src);
}
if (Z_TYPE_P(Z_INDIRECT_P(dst)) == IS_CONSTANT_AST) {
ce->ce_flags &= ~ZEND_ACC_CONSTANTS_UPDATED;
}
} while (dst != end);
} else {
src = parent_ce->default_static_members_table + parent_ce->default_static_members_count;
do {
dst--;
src--;
if (Z_TYPE_P(src) == IS_INDIRECT) {
ZVAL_INDIRECT(dst, Z_INDIRECT_P(src));
} else {
ZVAL_INDIRECT(dst, src);
}
} while (dst != end);
}
ce->default_static_members_count += parent_ce->default_static_members_count;
if (!ZEND_MAP_PTR(ce->static_members_table)) {
ZEND_ASSERT(ce->type == ZEND_INTERNAL_CLASS);
if (!EG(current_execute_data)) {
ZEND_MAP_PTR_NEW(ce->static_members_table);
} else {
/* internal class loaded by dl() */
ZEND_MAP_PTR_INIT(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();
if (zend_hash_num_elements(&parent_ce->properties_info)) {
zend_hash_extend(&ce->properties_info,
zend_hash_num_elements(&ce->properties_info) +
zend_hash_num_elements(&parent_ce->properties_info), 0);
ZEND_HASH_FOREACH_STR_KEY_PTR(&parent_ce->properties_info, key, property_info) {
do_inherit_property(property_info, key, ce);
} ZEND_HASH_FOREACH_END();
}
if (zend_hash_num_elements(&parent_ce->constants_table)) {
zend_class_constant *c;
zend_hash_extend(&ce->constants_table,
zend_hash_num_elements(&ce->constants_table) +
zend_hash_num_elements(&parent_ce->constants_table), 0);
ZEND_HASH_FOREACH_STR_KEY_PTR(&parent_ce->constants_table, key, c) {
do_inherit_class_constant(key, c, ce);
} ZEND_HASH_FOREACH_END();
}
if (zend_hash_num_elements(&parent_ce->function_table)) {
zend_hash_extend(&ce->function_table,
zend_hash_num_elements(&ce->function_table) +
zend_hash_num_elements(&parent_ce->function_table), 0);
ZEND_HASH_FOREACH_STR_KEY_PTR(&parent_ce->function_table, key, func) {
zend_function *new_func = do_inherit_method(key, func, ce);
if (new_func) {
_zend_hash_append_ptr(&ce->function_table, key, new_func);
}
} ZEND_HASH_FOREACH_END();
}
do_inherit_parent_constructor(ce);
if (ce->type == ZEND_INTERNAL_CLASS) {
if (ce->ce_flags & ZEND_ACC_IMPLICIT_ABSTRACT_CLASS) {
ce->ce_flags |= ZEND_ACC_EXPLICIT_ABSTRACT_CLASS;
}
}