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zend_inheritance.c
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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 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_interfaces.h"
#include "zend_closures.h"
#include "zend_smart_str.h"
#include "zend_operators.h"
#include "zend_exceptions.h"
#include "zend_enum.h"
#include "zend_attributes.h"
#include "zend_constants.h"
#include "zend_observer.h"
ZEND_API zend_class_entry* (*zend_inheritance_cache_get)(zend_class_entry *ce, zend_class_entry *parent, zend_class_entry **traits_and_interfaces) = NULL;
ZEND_API zend_class_entry* (*zend_inheritance_cache_add)(zend_class_entry *ce, zend_class_entry *proto, zend_class_entry *parent, zend_class_entry **traits_and_interfaces, HashTable *dependencies) = NULL;
/* Unresolved means that class declarations that are currently not available are needed to
* determine whether the inheritance is valid or not. At runtime UNRESOLVED should be treated
* as an ERROR. */
typedef zend_inheritance_status inheritance_status;
typedef enum {
PROP_INVARIANT,
PROP_COVARIANT,
PROP_CONTRAVARIANT,
} prop_variance;
static void add_dependency_obligation(zend_class_entry *ce, zend_class_entry *dependency_ce);
static void add_compatibility_obligation(
zend_class_entry *ce, const zend_function *child_fn, zend_class_entry *child_scope,
const zend_function *parent_fn, zend_class_entry *parent_scope);
static void add_property_compatibility_obligation(
zend_class_entry *ce, const zend_property_info *child_prop,
const zend_property_info *parent_prop, prop_variance variance);
static void add_class_constant_compatibility_obligation(
zend_class_entry *ce, const zend_class_constant *child_const,
const zend_class_constant *parent_const, const zend_string *const_name);
static void add_property_hook_obligation(
zend_class_entry *ce, const zend_property_info *hooked_prop, const zend_function *hook_func);
static void ZEND_COLD emit_incompatible_method_error(
const zend_function *child, zend_class_entry *child_scope,
const zend_function *parent, zend_class_entry *parent_scope,
inheritance_status status);
static void zend_type_copy_ctor(zend_type *const type, bool use_arena, bool persistent);
static void zend_type_list_copy_ctor(
zend_type *const parent_type,
bool use_arena,
bool persistent
) {
const zend_type_list *const old_list = ZEND_TYPE_LIST(*parent_type);
size_t size = ZEND_TYPE_LIST_SIZE(old_list->num_types);
zend_type_list *new_list = use_arena
? zend_arena_alloc(&CG(arena), size) : pemalloc(size, persistent);
memcpy(new_list, old_list, size);
ZEND_TYPE_SET_LIST(*parent_type, new_list);
if (use_arena) {
ZEND_TYPE_FULL_MASK(*parent_type) |= _ZEND_TYPE_ARENA_BIT;
}
zend_type *list_type;
ZEND_TYPE_LIST_FOREACH_MUTABLE(new_list, list_type) {
zend_type_copy_ctor(list_type, use_arena, persistent);
} ZEND_TYPE_LIST_FOREACH_END();
}
static void zend_type_copy_ctor(zend_type *const type, bool use_arena, bool persistent) {
if (ZEND_TYPE_HAS_LIST(*type)) {
zend_type_list_copy_ctor(type, use_arena, persistent);
} else if (ZEND_TYPE_HAS_NAME(*type)) {
zend_string_addref(ZEND_TYPE_NAME(*type));
}
}
static zend_function *zend_duplicate_internal_function(const zend_function *func, const zend_class_entry *ce) /* {{{ */
{
zend_function *new_function;
if (UNEXPECTED(ce->type & ZEND_INTERNAL_CLASS)) {
new_function = (zend_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);
}
return new_function;
}
/* }}} */
static zend_always_inline zend_function *zend_duplicate_function(zend_function *func, const zend_class_entry *ce) /* {{{ */
{
if (UNEXPECTED(func->type == ZEND_INTERNAL_FUNCTION)) {
return zend_duplicate_internal_function(func, ce);
} else {
if (func->op_array.refcount) {
(*func->op_array.refcount)++;
}
if (EXPECTED(func->op_array.function_name)) {
zend_string_addref(func->op_array.function_name);
}
return func;
}
}
/* }}} */
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 (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 (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 const char *zend_asymmetric_visibility_string(uint32_t fn_flags) /* {{{ */
{
if (fn_flags & ZEND_ACC_PRIVATE_SET) {
return "private(set)";
} else if (fn_flags & ZEND_ACC_PROTECTED_SET) {
return "protected(set)";
} else {
ZEND_ASSERT(!(fn_flags & ZEND_ACC_PUBLIC_SET));
return "omitted";
}
}
static zend_string *resolve_class_name(const zend_class_entry *scope, zend_string *name) {
ZEND_ASSERT(scope);
if (zend_string_equals_ci(name, ZSTR_KNOWN(ZEND_STR_PARENT)) && scope->parent) {
if (scope->ce_flags & ZEND_ACC_RESOLVED_PARENT) {
return scope->parent->name;
} else {
return scope->parent_name;
}
} else if (zend_string_equals_ci(name, ZSTR_KNOWN(ZEND_STR_SELF))) {
return scope->name;
} else {
return name;
}
}
static bool class_visible(const zend_class_entry *ce) {
if (ce->type == ZEND_INTERNAL_CLASS) {
return !(CG(compiler_options) & ZEND_COMPILE_IGNORE_INTERNAL_CLASSES);
} else {
ZEND_ASSERT(ce->type == ZEND_USER_CLASS);
return !(CG(compiler_options) & ZEND_COMPILE_IGNORE_OTHER_FILES)
|| ce->info.user.filename == CG(compiled_filename);
}
}
static zend_always_inline void register_unresolved_class(zend_string *name) {
/* We'll autoload this class and process delayed variance obligations later. */
if (!CG(delayed_autoloads)) {
ALLOC_HASHTABLE(CG(delayed_autoloads));
zend_hash_init(CG(delayed_autoloads), 0, NULL, NULL, 0);
}
zend_hash_add_empty_element(CG(delayed_autoloads), name);
}
static zend_class_entry *lookup_class_ex(
zend_class_entry *scope, zend_string *name, bool register_unresolved) {
zend_class_entry *ce;
bool in_preload = CG(compiler_options) & ZEND_COMPILE_PRELOAD;
if (UNEXPECTED(!EG(active) && !in_preload)) {
zend_string *lc_name = zend_string_tolower(name);
ce = zend_hash_find_ptr(CG(class_table), lc_name);
zend_string_release(lc_name);
if (register_unresolved && !ce) {
zend_error_noreturn(
E_COMPILE_ERROR, "%s must be registered before %s",
ZSTR_VAL(name), ZSTR_VAL(scope->name));
}
return ce;
}
ce = zend_lookup_class_ex(
name, NULL, ZEND_FETCH_CLASS_ALLOW_UNLINKED | ZEND_FETCH_CLASS_NO_AUTOLOAD);
if (!CG(in_compilation) || in_preload) {
if (ce) {
return ce;
}
if (register_unresolved) {
register_unresolved_class(name);
}
} else {
if (ce && class_visible(ce)) {
return ce;
}
/* The current class may not be registered yet, so check for it explicitly. */
if (zend_string_equals_ci(scope->name, name)) {
return scope;
}
}
return NULL;
}
static zend_class_entry *lookup_class(zend_class_entry *scope, zend_string *name) {
return lookup_class_ex(scope, name, /* register_unresolved */ false);
}
/* Instanceof that's safe to use on unlinked classes. */
static bool unlinked_instanceof(const zend_class_entry *ce1, const zend_class_entry *ce2) {
if (ce1 == ce2) {
return 1;
}
if (ce1->ce_flags & ZEND_ACC_LINKED) {
return instanceof_function(ce1, ce2);
}
if (ce1->parent) {
zend_class_entry *parent_ce;
if (ce1->ce_flags & ZEND_ACC_RESOLVED_PARENT) {
parent_ce = ce1->parent;
} else {
parent_ce = zend_lookup_class_ex(ce1->parent_name, NULL,
ZEND_FETCH_CLASS_ALLOW_UNLINKED | ZEND_FETCH_CLASS_NO_AUTOLOAD);
}
/* It's not sufficient to only check the parent chain itself, as need to do a full
* recursive instanceof in case the parent interfaces haven't been copied yet. */
if (parent_ce && unlinked_instanceof(parent_ce, ce2)) {
return 1;
}
}
if (ce1->num_interfaces) {
uint32_t i;
if (ce1->ce_flags & ZEND_ACC_RESOLVED_INTERFACES) {
/* Unlike the normal instanceof_function(), we have to perform a recursive
* check here, as the parent interfaces might not have been fully copied yet. */
for (i = 0; i < ce1->num_interfaces; i++) {
if (unlinked_instanceof(ce1->interfaces[i], ce2)) {
return 1;
}
}
} else {
for (i = 0; i < ce1->num_interfaces; i++) {
const zend_class_entry *ce = zend_lookup_class_ex(
ce1->interface_names[i].name, ce1->interface_names[i].lc_name,
ZEND_FETCH_CLASS_ALLOW_UNLINKED | ZEND_FETCH_CLASS_NO_AUTOLOAD);
/* Avoid recursing if class implements itself. */
if (ce && ce != ce1 && unlinked_instanceof(ce, ce2)) {
return 1;
}
}
}
}
return 0;
}
static bool zend_type_permits_self(
const zend_type type, const zend_class_entry *scope, zend_class_entry *self) {
if (ZEND_TYPE_FULL_MASK(type) & MAY_BE_OBJECT) {
return 1;
}
/* Any types that may satisfy self must have already been loaded at this point
* (as a parent or interface), so we never need to register delayed variance obligations
* for this case. */
const zend_type *single_type;
ZEND_TYPE_FOREACH(type, single_type) {
if (ZEND_TYPE_HAS_NAME(*single_type)) {
zend_string *name = resolve_class_name(scope, ZEND_TYPE_NAME(*single_type));
const zend_class_entry *ce = lookup_class(self, name);
if (ce && unlinked_instanceof(self, ce)) {
return 1;
}
}
} ZEND_TYPE_FOREACH_END();
return 0;
}
static void track_class_dependency(zend_class_entry *ce, zend_string *class_name)
{
HashTable *ht;
ZEND_ASSERT(class_name);
if (!CG(current_linking_class) || ce == CG(current_linking_class)) {
return;
} else if (zend_string_equals_ci(class_name, ZSTR_KNOWN(ZEND_STR_SELF))
|| zend_string_equals_ci(class_name, ZSTR_KNOWN(ZEND_STR_PARENT))) {
return;
}
#ifndef ZEND_WIN32
/* On non-Windows systems, internal classes are always the same,
* so there is no need to explicitly track them. */
if (ce->type == ZEND_INTERNAL_CLASS) {
return;
}
#endif
ht = (HashTable*)CG(current_linking_class)->inheritance_cache;
if (!(ce->ce_flags & ZEND_ACC_IMMUTABLE)) {
// TODO: dependency on not-immutable class ???
if (ht) {
zend_hash_destroy(ht);
FREE_HASHTABLE(ht);
CG(current_linking_class)->inheritance_cache = NULL;
}
CG(current_linking_class)->ce_flags &= ~ZEND_ACC_CACHEABLE;
CG(current_linking_class) = NULL;
return;
}
/* Record dependency */
if (!ht) {
ALLOC_HASHTABLE(ht);
zend_hash_init(ht, 0, NULL, NULL, 0);
CG(current_linking_class)->inheritance_cache = (zend_inheritance_cache_entry*)ht;
}
zend_hash_add_ptr(ht, class_name, ce);
}
/* Check whether any type in the fe_type intersection type is a subtype of the proto class. */
static inheritance_status zend_is_intersection_subtype_of_class(
zend_class_entry *fe_scope, const zend_type *fe_type_ptr,
zend_class_entry *proto_scope, zend_string *proto_class_name, zend_class_entry *proto_ce)
{
ZEND_ASSERT(ZEND_TYPE_IS_INTERSECTION(*fe_type_ptr));
bool have_unresolved = false;
const zend_type *single_type;
/* Traverse the list of child types and check that at least one is
* a subtype of the parent type being checked */
ZEND_TYPE_FOREACH(*fe_type_ptr, single_type) {
zend_class_entry *fe_ce;
zend_string *fe_class_name = NULL;
if (ZEND_TYPE_HAS_NAME(*single_type)) {
fe_class_name =
resolve_class_name(fe_scope, ZEND_TYPE_NAME(*single_type));
if (zend_string_equals_ci(fe_class_name, proto_class_name)) {
return INHERITANCE_SUCCESS;
}
if (!proto_ce) proto_ce = lookup_class(proto_scope, proto_class_name);
fe_ce = lookup_class(fe_scope, fe_class_name);
} else {
/* standard type in an intersection type is impossible,
* because it would be a fatal compile error */
ZEND_UNREACHABLE();
continue;
}
if (!fe_ce || !proto_ce) {
have_unresolved = true;
continue;
}
if (unlinked_instanceof(fe_ce, proto_ce)) {
track_class_dependency(fe_ce, fe_class_name);
track_class_dependency(proto_ce, proto_class_name);
return INHERITANCE_SUCCESS;
}
} ZEND_TYPE_FOREACH_END();
return have_unresolved ? INHERITANCE_UNRESOLVED : INHERITANCE_ERROR;
}
/* Check whether a single class proto type is a subtype of a potentially complex fe_type. */
static inheritance_status zend_is_class_subtype_of_type(
zend_class_entry *fe_scope, zend_string *fe_class_name,
zend_class_entry *proto_scope, const zend_type *proto_type_ptr
) {
const zend_type proto_type = *proto_type_ptr;
zend_class_entry *fe_ce = NULL;
bool have_unresolved = 0;
/* If the parent has 'object' as a return type, any class satisfies the co-variant check */
if (ZEND_TYPE_FULL_MASK(proto_type) & MAY_BE_OBJECT) {
/* Currently, any class name would be allowed here. We still perform a class lookup
* for forward-compatibility reasons, as we may have named types in the future that
* are not classes (such as typedefs). */
if (!fe_ce) fe_ce = lookup_class(fe_scope, fe_class_name);
if (!fe_ce) {
have_unresolved = 1;
} else {
track_class_dependency(fe_ce, fe_class_name);
return INHERITANCE_SUCCESS;
}
}
/* If the parent has 'callable' as a return type, then Closure satisfies the co-variant check */
if (ZEND_TYPE_FULL_MASK(proto_type) & MAY_BE_CALLABLE) {
if (!fe_ce) fe_ce = lookup_class(fe_scope, fe_class_name);
if (!fe_ce) {
have_unresolved = 1;
} else if (fe_ce == zend_ce_closure) {
track_class_dependency(fe_ce, fe_class_name);
return INHERITANCE_SUCCESS;
}
}
/* If the parent has 'static' as a return type, then final classes could replace it with self */
if ((ZEND_TYPE_FULL_MASK(proto_type) & MAY_BE_STATIC) && (fe_scope->ce_flags & ZEND_ACC_FINAL)) {
if (!fe_ce) fe_ce = lookup_class(fe_scope, fe_class_name);
if (!fe_ce) {
have_unresolved = 1;
} else if (fe_ce == fe_scope) {
track_class_dependency(fe_ce, fe_class_name);
return INHERITANCE_SUCCESS;
}
}
const zend_type *single_type;
/* Traverse the list of parent types and check if the current child (FE)
* class is the subtype of at least one of them (union) or all of them (intersection). */
bool is_intersection = ZEND_TYPE_IS_INTERSECTION(proto_type);
ZEND_TYPE_FOREACH(proto_type, single_type) {
if (ZEND_TYPE_IS_INTERSECTION(*single_type)) {
inheritance_status subtype_status = zend_is_class_subtype_of_type(
fe_scope, fe_class_name, proto_scope, single_type);
switch (subtype_status) {
case INHERITANCE_ERROR:
if (is_intersection) {
return INHERITANCE_ERROR;
}
continue;
case INHERITANCE_UNRESOLVED:
have_unresolved = 1;
continue;
case INHERITANCE_SUCCESS:
if (!is_intersection) {
return INHERITANCE_SUCCESS;
}
continue;
EMPTY_SWITCH_DEFAULT_CASE();
}
}
zend_class_entry *proto_ce;
zend_string *proto_class_name = NULL;
if (ZEND_TYPE_HAS_NAME(*single_type)) {
proto_class_name =
resolve_class_name(proto_scope, ZEND_TYPE_NAME(*single_type));
if (zend_string_equals_ci(fe_class_name, proto_class_name)) {
if (!is_intersection) {
return INHERITANCE_SUCCESS;
}
continue;
}
if (!fe_ce) fe_ce = lookup_class(fe_scope, fe_class_name);
proto_ce = lookup_class(proto_scope, proto_class_name);
} else {
/* standard type */
ZEND_ASSERT(!is_intersection);
continue;
}
if (!fe_ce || !proto_ce) {
have_unresolved = 1;
continue;
}
if (unlinked_instanceof(fe_ce, proto_ce)) {
track_class_dependency(fe_ce, fe_class_name);
track_class_dependency(proto_ce, proto_class_name);
if (!is_intersection) {
return INHERITANCE_SUCCESS;
}
} else {
if (is_intersection) {
return INHERITANCE_ERROR;
}
}
} ZEND_TYPE_FOREACH_END();
if (have_unresolved) {
return INHERITANCE_UNRESOLVED;
}
return is_intersection ? INHERITANCE_SUCCESS : INHERITANCE_ERROR;
}
static zend_string *get_class_from_type(const zend_class_entry *scope, const zend_type single_type) {
if (ZEND_TYPE_HAS_NAME(single_type)) {
return resolve_class_name(scope, ZEND_TYPE_NAME(single_type));
}
return NULL;
}
static void register_unresolved_classes(zend_class_entry *scope, const zend_type type) {
const zend_type *single_type;
ZEND_TYPE_FOREACH(type, single_type) {
if (ZEND_TYPE_HAS_LIST(*single_type)) {
register_unresolved_classes(scope, *single_type);
continue;
}
if (ZEND_TYPE_HAS_NAME(*single_type)) {
zend_string *class_name = resolve_class_name(scope, ZEND_TYPE_NAME(*single_type));
lookup_class_ex(scope, class_name, /* register_unresolved */ true);
}
} ZEND_TYPE_FOREACH_END();
}
static inheritance_status zend_is_intersection_subtype_of_type(
zend_class_entry *fe_scope, const zend_type *fe_type_ptr,
zend_class_entry *proto_scope, const zend_type *proto_type_ptr
) {
const zend_type fe_type = *fe_type_ptr;
const zend_type proto_type = *proto_type_ptr;
bool have_unresolved = false;
const zend_type *single_type;
uint32_t proto_type_mask = ZEND_TYPE_PURE_MASK(proto_type);
/* Currently, for object type any class name would be allowed here.
* We still perform a class lookup for forward-compatibility reasons,
* as we may have named types in the future that are not classes
* (such as typedefs). */
if (proto_type_mask & MAY_BE_OBJECT) {
ZEND_TYPE_FOREACH(fe_type, single_type) {
zend_string *fe_class_name = get_class_from_type(fe_scope, *single_type);
if (!fe_class_name) {
continue;
}
zend_class_entry *fe_ce = lookup_class(fe_scope, fe_class_name);
if (fe_ce) {
track_class_dependency(fe_ce, fe_class_name);
return INHERITANCE_SUCCESS;
} else {
have_unresolved = true;
}
} ZEND_TYPE_FOREACH_END();
}
/* U_1&...&U_n < V_1&...&V_m if forall V_j. exists U_i. U_i < V_j.
* U_1&...&U_n < V_1|...|V_m if exists V_j. exists U_i. U_i < V_j.
* As such, we need to iterate over proto_type (V_j) first and use a different
* quantifier depending on whether fe_type is a union or an intersection. */
inheritance_status early_exit_status =
ZEND_TYPE_IS_INTERSECTION(proto_type) ? INHERITANCE_ERROR : INHERITANCE_SUCCESS;
ZEND_TYPE_FOREACH(proto_type, single_type) {
inheritance_status status;
if (ZEND_TYPE_IS_INTERSECTION(*single_type)) {
status = zend_is_intersection_subtype_of_type(
fe_scope, fe_type_ptr, proto_scope, single_type);
} else {
zend_string *proto_class_name = get_class_from_type(proto_scope, *single_type);
if (!proto_class_name) {
continue;
}
zend_class_entry *proto_ce = NULL;
status = zend_is_intersection_subtype_of_class(
fe_scope, fe_type_ptr, proto_scope, proto_class_name, proto_ce);
}
if (status == early_exit_status) {
return status;
}
if (status == INHERITANCE_UNRESOLVED) {
have_unresolved = true;
}
} ZEND_TYPE_FOREACH_END();
if (have_unresolved) {
return INHERITANCE_UNRESOLVED;
}
return early_exit_status == INHERITANCE_ERROR ? INHERITANCE_SUCCESS : INHERITANCE_ERROR;
}
ZEND_API inheritance_status zend_perform_covariant_type_check(
zend_class_entry *fe_scope, const zend_type *fe_type_ptr,
zend_class_entry *proto_scope, const zend_type *proto_type_ptr)
{
const zend_type fe_type = *fe_type_ptr;
const zend_type proto_type = *proto_type_ptr;
ZEND_ASSERT(ZEND_TYPE_IS_SET(fe_type) && ZEND_TYPE_IS_SET(proto_type));
/* Apart from void, everything is trivially covariant to the mixed type.
* Handle this case separately to ensure it never requires class loading. */
if (ZEND_TYPE_PURE_MASK(proto_type) == MAY_BE_ANY &&
!ZEND_TYPE_CONTAINS_CODE(fe_type, IS_VOID)) {
return INHERITANCE_SUCCESS;
}
/* Builtin types may be removed, but not added */
uint32_t fe_type_mask = ZEND_TYPE_PURE_MASK(fe_type);
uint32_t proto_type_mask = ZEND_TYPE_PURE_MASK(proto_type);
uint32_t added_types = fe_type_mask & ~proto_type_mask;
if (added_types) {
if ((added_types & MAY_BE_STATIC)
&& zend_type_permits_self(proto_type, proto_scope, fe_scope)) {
/* Replacing type that accepts self with static is okay */
added_types &= ~MAY_BE_STATIC;
}
if (added_types == MAY_BE_NEVER) {
/* never is the bottom type */
return INHERITANCE_SUCCESS;
}
if (added_types) {
/* Otherwise adding new types is illegal */
return INHERITANCE_ERROR;
}
}
inheritance_status early_exit_status;
bool have_unresolved = false;
if (ZEND_TYPE_IS_INTERSECTION(fe_type)) {
early_exit_status =
ZEND_TYPE_IS_INTERSECTION(proto_type) ? INHERITANCE_ERROR : INHERITANCE_SUCCESS;
inheritance_status status = zend_is_intersection_subtype_of_type(
fe_scope, fe_type_ptr, proto_scope, proto_type_ptr);
if (status == early_exit_status) {
return status;
}
if (status == INHERITANCE_UNRESOLVED) {
have_unresolved = true;
}
} else {
/* U_1|...|U_n < V_1|...|V_m if forall U_i. exists V_j. U_i < V_j.
* U_1|...|U_n < V_1&...&V_m if forall U_i. forall V_j. U_i < V_j.
* We need to iterate over fe_type (U_i) first and the logic is independent of
* whether proto_type is a union or intersection (only the inner check differs). */
early_exit_status = INHERITANCE_ERROR;
const zend_type *single_type;
ZEND_TYPE_FOREACH(fe_type, single_type) {
inheritance_status status;
/* Union has an intersection type as it's member */
if (ZEND_TYPE_IS_INTERSECTION(*single_type)) {
status = zend_is_intersection_subtype_of_type(
fe_scope, single_type, proto_scope, proto_type_ptr);
} else {
zend_string *fe_class_name = get_class_from_type(fe_scope, *single_type);
if (!fe_class_name) {
continue;
}
status = zend_is_class_subtype_of_type(
fe_scope, fe_class_name, proto_scope, proto_type_ptr);
}
if (status == early_exit_status) {
return status;
}
if (status == INHERITANCE_UNRESOLVED) {
have_unresolved = true;
}
} ZEND_TYPE_FOREACH_END();
}
if (!have_unresolved) {
return early_exit_status == INHERITANCE_ERROR ? INHERITANCE_SUCCESS : INHERITANCE_ERROR;
}
register_unresolved_classes(fe_scope, fe_type);
register_unresolved_classes(proto_scope, proto_type);
return INHERITANCE_UNRESOLVED;
}
static inheritance_status zend_do_perform_arg_type_hint_check(
zend_class_entry *fe_scope, const zend_arg_info *fe_arg_info,
zend_class_entry *proto_scope, zend_arg_info *proto_arg_info) /* {{{ */
{
if (!ZEND_TYPE_IS_SET(fe_arg_info->type) || ZEND_TYPE_PURE_MASK(fe_arg_info->type) == MAY_BE_ANY) {
/* Child with no type or mixed type is always compatible */
return INHERITANCE_SUCCESS;
}
if (!ZEND_TYPE_IS_SET(proto_arg_info->type)) {
/* Child defines a type, but parent doesn't, violates LSP */
return INHERITANCE_ERROR;
}
/* Contravariant type check is performed as a covariant type check with swapped
* argument order. */
return zend_perform_covariant_type_check(
proto_scope, &proto_arg_info->type, fe_scope, &fe_arg_info->type);
}
/* }}} */
/* For trait methods, fe_scope/proto_scope may differ from fe/proto->common.scope,
* as self will refer to the self of the class the trait is used in, not the trait
* the method was declared in. */
static inheritance_status zend_do_perform_implementation_check(
const zend_function *fe, zend_class_entry *fe_scope,
const zend_function *proto, zend_class_entry *proto_scope) /* {{{ */
{
uint32_t num_args, proto_num_args, fe_num_args;
inheritance_status status, local_status;
bool proto_is_variadic, fe_is_variadic;
/* Checks for constructors only if they are declared in an interface,
* or explicitly marked as abstract
*/
ZEND_ASSERT(!((fe->common.fn_flags & ZEND_ACC_CTOR)
&& ((proto->common.scope->ce_flags & ZEND_ACC_INTERFACE) == 0
&& (proto->common.fn_flags & ZEND_ACC_ABSTRACT) == 0)));
/* If the prototype method is private and not abstract, we do not enforce a signature.
* private abstract methods can only occur in traits. */
ZEND_ASSERT(!(proto->common.fn_flags & ZEND_ACC_PRIVATE)
|| (proto->common.fn_flags & ZEND_ACC_ABSTRACT));
/* The number of required arguments cannot increase. */
if (proto->common.required_num_args < fe->common.required_num_args) {
return INHERITANCE_ERROR;
}
/* 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 INHERITANCE_ERROR;
}
proto_is_variadic = (proto->common.fn_flags & ZEND_ACC_VARIADIC) != 0;
fe_is_variadic = (fe->common.fn_flags & ZEND_ACC_VARIADIC) != 0;
/* A variadic function cannot become non-variadic */
if (proto_is_variadic && !fe_is_variadic) {
return INHERITANCE_ERROR;
}
/* The variadic argument is not included in the stored argument count. */
proto_num_args = proto->common.num_args + proto_is_variadic;
fe_num_args = fe->common.num_args + fe_is_variadic;
num_args = MAX(proto_num_args, fe_num_args);
status = INHERITANCE_SUCCESS;
for (uint32_t i = 0; i < num_args; i++) {
zend_arg_info *proto_arg_info =
i < proto_num_args ? &proto->common.arg_info[i] :
proto_is_variadic ? &proto->common.arg_info[proto_num_args - 1] : NULL;
zend_arg_info *fe_arg_info =
i < fe_num_args ? &fe->common.arg_info[i] :
fe_is_variadic ? &fe->common.arg_info[fe_num_args - 1] : NULL;
if (!proto_arg_info) {
/* A new (optional) argument has been added, which is fine. */
continue;
}
if (!fe_arg_info) {
/* An argument has been removed. This is considered illegal, because arity checks
* work based on a model where passing more than the declared number of parameters
* to a function is an error. */
return INHERITANCE_ERROR;
}
local_status = zend_do_perform_arg_type_hint_check(
fe_scope, fe_arg_info, proto_scope, proto_arg_info);
if (UNEXPECTED(local_status != INHERITANCE_SUCCESS)) {
if (UNEXPECTED(local_status == INHERITANCE_ERROR)) {
return INHERITANCE_ERROR;
}
ZEND_ASSERT(local_status == INHERITANCE_UNRESOLVED);
status = INHERITANCE_UNRESOLVED;
}
/* by-ref constraints on arguments are invariant */
if (ZEND_ARG_SEND_MODE(fe_arg_info) != ZEND_ARG_SEND_MODE(proto_arg_info)) {
return INHERITANCE_ERROR;
}
}
/* 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, unless the parent return type is tentative. */
if (!(fe->common.fn_flags & ZEND_ACC_HAS_RETURN_TYPE)) {
if (!ZEND_ARG_TYPE_IS_TENTATIVE(&proto->common.arg_info[-1])) {
return INHERITANCE_ERROR;
}
if (status == INHERITANCE_SUCCESS) {
return INHERITANCE_WARNING;
}
return status;
}
local_status = zend_perform_covariant_type_check(
fe_scope, &fe->common.arg_info[-1].type, proto_scope, &proto->common.arg_info[-1].type);
if (UNEXPECTED(local_status != INHERITANCE_SUCCESS)) {
if (local_status == INHERITANCE_ERROR
&& ZEND_ARG_TYPE_IS_TENTATIVE(&proto->common.arg_info[-1])) {
local_status = INHERITANCE_WARNING;
}
return local_status;
}
}
return status;
}
/* }}} */
static ZEND_COLD void zend_append_type_hint(
smart_str *str, zend_class_entry *scope, const zend_arg_info *arg_info, bool return_hint) /* {{{ */
{
if (ZEND_TYPE_IS_SET(arg_info->type)) {
zend_string *type_str = zend_type_to_string_resolved(arg_info->type, scope);
smart_str_append(str, type_str);
zend_string_release(type_str);
if (!return_hint) {
smart_str_appendc(str, ' ');
}
}
}
/* }}} */
static ZEND_COLD zend_string *zend_get_function_declaration(
const zend_function *fptr, zend_class_entry *scope) /* {{{ */
{
smart_str str = {0};
if (fptr->op_array.fn_flags & ZEND_ACC_RETURN_REFERENCE) {
smart_str_appends(&str, "& ");
}
if (fptr->common.scope) {
if (fptr->common.scope->ce_flags & ZEND_ACC_ANON_CLASS) {
/* cut off on NULL byte ... class@anonymous */
smart_str_appends(&str, ZSTR_VAL(fptr->common.scope->name));
} else {
smart_str_appendl(&str, ZSTR_VAL(fptr->common.scope->name), ZSTR_LEN(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 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 (uint32_t i = 0; i < num_args;) {
zend_append_type_hint(&str, scope, arg_info, 0);
if (ZEND_ARG_SEND_MODE(arg_info)) {
smart_str_appendc(&str, '&');
}
if (ZEND_ARG_IS_VARIADIC(arg_info)) {
smart_str_appends(&str, "...");
}
smart_str_appendc(&str, '$');
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));
}
if (i >= required && !ZEND_ARG_IS_VARIADIC(arg_info)) {
smart_str_appends(&str, " = ");
if (fptr->type == ZEND_INTERNAL_FUNCTION) {
if (((zend_internal_arg_info*)arg_info)->default_value) {
smart_str_appends(&str, ((zend_internal_arg_info*)arg_info)->default_value);
} else {
smart_str_appends(&str, "<default>");
}
} else {
zend_op *precv = NULL;
{
uint32_t idx = i;
zend_op *op = fptr->op_array.opcodes;
const 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");