/src/php-src/Zend/zend_object_handlers.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          |
   | license@zend.com so we can mail you a copy immediately.              |
   +----------------------------------------------------------------------+
   | Authors: Andi Gutmans <andi@php.net>                                 |
   |          Zeev Suraski <zeev@php.net>                                 |
   |          Dmitry Stogov <dmitry@php.net>                              |
   +----------------------------------------------------------------------+
*/

#include "zend.h"
#include "zend_globals.h"
#include "zend_lazy_objects.h"
#include "zend_variables.h"
#include "zend_API.h"
#include "zend_objects.h"
#include "zend_objects_API.h"
#include "zend_object_handlers.h"
#include "zend_interfaces.h"
#include "zend_exceptions.h"
#include "zend_closures.h"
#include "zend_compile.h"
#include "zend_hash.h"
#include "zend_property_hooks.h"
#include "zend_observer.h"

#define DEBUG_OBJECT_HANDLERS 0

#define ZEND_WRONG_PROPERTY_OFFSET   0
#define ZEND_HOOKED_PROPERTY_OFFSET 1

/* guard flags */
#define IN_GET    ZEND_GUARD_PROPERTY_GET
#define IN_SET    ZEND_GUARD_PROPERTY_SET
#define IN_UNSET  ZEND_GUARD_PROPERTY_UNSET
#define IN_ISSET  ZEND_GUARD_PROPERTY_ISSET
#define IN_HOOK   ZEND_GUARD_PROPERTY_HOOK

static zend_always_inline bool zend_objects_check_stack_limit(void)
{
#ifdef ZEND_CHECK_STACK_LIMIT
  return zend_call_stack_overflowed(EG(stack_limit));
#else
  return false;
#endif
}

/*
  __X accessors explanation:

  if we have __get and property that is not part of the properties array is
  requested, we call __get handler. If it fails, we return uninitialized.

  if we have __set and property that is not part of the properties array is
  set, we call __set handler. If it fails, we do not change the array.

  for both handlers above, when we are inside __get/__set, no further calls for
  __get/__set for this property of this object will be made, to prevent endless
  recursion and enable accessors to change properties array.

  if we have __call and method which is not part of the class function table is
  called, we cal __call handler.
*/

ZEND_API HashTable *rebuild_object_properties_internal(zend_object *zobj) /* {{{ */
{
  if (!zobj->properties) {
    zend_property_info *prop_info;
    zend_class_entry *ce = zobj->ce;
    int i;

    zobj->properties = zend_new_array(ce->default_properties_count);
    if (ce->default_properties_count) {
      zend_hash_real_init_mixed(zobj->properties);
      for (i = 0; i < ce->default_properties_count; i++) {
        prop_info = ce->properties_info_table[i];

        if (!prop_info) {
          continue;
        }

        if (UNEXPECTED(Z_TYPE_P(OBJ_PROP(zobj, prop_info->offset)) == IS_UNDEF)) {
          HT_FLAGS(zobj->properties) |= HASH_FLAG_HAS_EMPTY_IND;
        }

        _zend_hash_append_ind(zobj->properties, prop_info->name,
          OBJ_PROP(zobj, prop_info->offset));
      }
    }
  }

  return zobj->properties;
}
/* }}} */

/* Implements the fast path for array cast */
ZEND_API HashTable *zend_std_build_object_properties_array(zend_object *zobj) /* {{{ */
{
  zend_property_info *prop_info;
  zend_class_entry *ce = zobj->ce;
  HashTable *ht;
  zval* prop;
  int i;

  ZEND_ASSERT(!(zend_object_is_lazy_proxy(zobj) && zend_lazy_object_initialized(zobj)));
  ZEND_ASSERT(!zobj->properties);
  ht = zend_new_array(ce->default_properties_count);
  if (ce->default_properties_count) {
    zend_hash_real_init_mixed(ht);
    for (i = 0; i < ce->default_properties_count; i++) {
      prop_info = ce->properties_info_table[i];

      if (!prop_info) {
        continue;
      }

      prop = OBJ_PROP(zobj, prop_info->offset);
      if (UNEXPECTED(Z_TYPE_P(prop) == IS_UNDEF)) {
        continue;
      }

      if (Z_ISREF_P(prop) && Z_REFCOUNT_P(prop) == 1) {
        prop = Z_REFVAL_P(prop);
      }

      Z_TRY_ADDREF_P(prop);
      _zend_hash_append(ht, prop_info->name, prop);
    }
  }
  return ht;
}
/* }}} */

ZEND_API HashTable *zend_std_get_properties(zend_object *zobj) /* {{{ */
{
  return zend_std_get_properties_ex(zobj);
}
/* }}} */

/* Fetch properties HashTable without triggering lazy initialization */
ZEND_API HashTable *zend_get_properties_no_lazy_init(zend_object *zobj)
{
  if (zobj->handlers->get_properties == zend_std_get_properties) {
    if (UNEXPECTED(zend_object_is_lazy_proxy(zobj)
        && zend_lazy_object_initialized(zobj))) {
      zend_object *instance = zend_lazy_object_get_instance(zobj);
      return zend_get_properties_no_lazy_init(instance);
    }

    if (!zobj->properties) {
      rebuild_object_properties_internal(zobj);
    }
    return zobj->properties;
  }

  ZEND_ASSERT(!zend_object_is_lazy(zobj));

  return zobj->handlers->get_properties(zobj);
}

ZEND_API HashTable *zend_std_get_gc(zend_object *zobj, zval **table, int *n) /* {{{ */
{
  if (zobj->handlers->get_properties != zend_std_get_properties) {
    *table = NULL;
    *n = 0;
    return zobj->handlers->get_properties(zobj);
  } else {
    if (UNEXPECTED(zend_object_is_lazy(zobj))) {
      return zend_lazy_object_get_gc(zobj, table, n);
    } else if (zobj->properties) {
      *table = NULL;
      *n = 0;
      return zobj->properties;
    } else {
      *table = zobj->properties_table;
      *n = zobj->ce->default_properties_count;
      return NULL;
    }
  }
}
/* }}} */

ZEND_API HashTable *zend_std_get_debug_info(zend_object *object, int *is_temp) /* {{{ */
{
  zend_class_entry *ce = object->ce;
  zval retval;
  HashTable *ht;

  if (!ce->__debugInfo) {
    if (UNEXPECTED(zend_object_is_lazy(object))) {
      return zend_lazy_object_debug_info(object, is_temp);
    }

    *is_temp = 0;
    return object->handlers->get_properties(object);
  }

  zend_call_known_instance_method_with_0_params(ce->__debugInfo, object, &retval);
  if (UNEXPECTED(Z_ISREF(retval))) {
    zend_unwrap_reference(&retval);
  }
  if (Z_TYPE(retval) == IS_ARRAY) {
    if (!Z_REFCOUNTED(retval)) {
      *is_temp = 1;
      return zend_array_dup(Z_ARRVAL(retval));
    } else if (Z_REFCOUNT(retval) <= 1) {
      *is_temp = 1;
      ht = Z_ARR(retval);
      return ht;
    } else {
      *is_temp = 0;
      zval_ptr_dtor(&retval);
      return Z_ARRVAL(retval);
    }
  } else if (Z_TYPE(retval) == IS_NULL) {
    *is_temp = 1;
    ht = zend_new_array(0);
    return ht;
  }

  zend_error_noreturn(E_ERROR, ZEND_DEBUGINFO_FUNC_NAME "() must return an array");

  return NULL; /* Compilers are dumb and don't understand that noreturn means that the function does NOT need a return value... */
}
/* }}} */

static void zend_std_call_getter(zend_object *zobj, zend_string *prop_name, zval *retval) /* {{{ */
{
  zval member;
  ZVAL_STR(&member, prop_name);
  zend_call_known_instance_method_with_1_params(zobj->ce->__get, zobj, retval, &member);
}
/* }}} */

static void zend_std_call_setter(zend_object *zobj, zend_string *prop_name, zval *value) /* {{{ */
{
  zval args[2];
  ZVAL_STR(&args[0], prop_name);
  ZVAL_COPY_VALUE(&args[1], value);
  zend_call_known_instance_method(zobj->ce->__set, zobj, NULL, 2, args);
}
/* }}} */

static void zend_std_call_unsetter(zend_object *zobj, zend_string *prop_name) /* {{{ */
{
  zval member;
  ZVAL_STR(&member, prop_name);
  zend_call_known_instance_method_with_1_params(zobj->ce->__unset, zobj, NULL, &member);
}
/* }}} */

static void zend_std_call_issetter(zend_object *zobj, zend_string *prop_name, zval *retval) /* {{{ */
{
  zval member;
  ZVAL_STR(&member, prop_name);
  zend_call_known_instance_method_with_1_params(zobj->ce->__isset, zobj, retval, &member);
}
/* }}} */


static zend_always_inline bool is_derived_class(const zend_class_entry *child_class, const zend_class_entry *parent_class) /* {{{ */
{
  child_class = child_class->parent;
  while (child_class) {
    if (child_class == parent_class) {
      return 1;
    }
    child_class = child_class->parent;
  }

  return 0;
}
/* }}} */

static zend_never_inline int is_protected_compatible_scope(const zend_class_entry *ce, const zend_class_entry *scope) /* {{{ */
{
  return scope &&
    (is_derived_class(ce, scope) || is_derived_class(scope, ce));
}
/* }}} */

static zend_never_inline zend_property_info *zend_get_parent_private_property(zend_class_entry *scope, const zend_class_entry *ce, zend_string *member) /* {{{ */
{
  zval *zv;
  zend_property_info *prop_info;

  if (scope != ce && scope && is_derived_class(ce, scope)) {
    zv = zend_hash_find(&scope->properties_info, member);
    if (zv != NULL) {
      prop_info = (zend_property_info*)Z_PTR_P(zv);
      if ((prop_info->flags & ZEND_ACC_PRIVATE)
       && prop_info->ce == scope) {
        return prop_info;
      }
    }
  }
  return NULL;
}
/* }}} */

static ZEND_COLD zend_never_inline void zend_bad_property_access(const zend_property_info *property_info, const zend_class_entry *ce, const zend_string *member) /* {{{ */
{
  zend_throw_error(NULL, "Cannot access %s property %s::$%s", zend_visibility_string(property_info->flags), ZSTR_VAL(ce->name), ZSTR_VAL(member));
}
/* }}} */

static ZEND_COLD zend_never_inline void zend_bad_property_name(void) /* {{{ */
{
  zend_throw_error(NULL, "Cannot access property starting with \"\\0\"");
}
/* }}} */

static ZEND_COLD zend_never_inline void zend_forbidden_dynamic_property(
    const zend_class_entry *ce, const zend_string *member) {
  zend_throw_error(NULL, "Cannot create dynamic property %s::$%s",
    ZSTR_VAL(ce->name), ZSTR_VAL(member));
}

static ZEND_COLD zend_never_inline bool zend_deprecated_dynamic_property(
    zend_object *obj, const zend_string *member) {
  GC_ADDREF(obj);
  zend_error(E_DEPRECATED, "Creation of dynamic property %s::$%s is deprecated",
    ZSTR_VAL(obj->ce->name), ZSTR_VAL(member));
  if (UNEXPECTED(GC_DELREF(obj) == 0)) {
    zend_class_entry *ce = obj->ce;
    zend_objects_store_del(obj);
    if (!EG(exception)) {
      /* We cannot continue execution and have to throw an exception */
      zend_throw_error(NULL, "Cannot create dynamic property %s::$%s",
        ZSTR_VAL(ce->name), ZSTR_VAL(member));
    }
    return 0;
  }
  return 1;
}

static ZEND_COLD zend_never_inline void zend_readonly_property_unset_error(
    zend_class_entry *ce, zend_string *member) {
  zend_throw_error(NULL, "Cannot unset readonly property %s::$%s",
    ZSTR_VAL(ce->name), ZSTR_VAL(member));
}

static zend_always_inline zend_class_entry *get_fake_or_executed_scope(void)
{
  if (UNEXPECTED(EG(fake_scope))) {
    return EG(fake_scope);
  } else {
    return zend_get_executed_scope();
  }
}

static zend_always_inline uintptr_t zend_get_property_offset(zend_class_entry *ce, zend_string *member, int silent, void **cache_slot, const zend_property_info **info_ptr) /* {{{ */
{
  zval *zv;
  zend_property_info *property_info;
  uint32_t flags;
  uintptr_t offset;

  if (cache_slot && EXPECTED(ce == CACHED_PTR_EX(cache_slot))) {
    *info_ptr = CACHED_PTR_EX(cache_slot + 2);
    return (uintptr_t)CACHED_PTR_EX(cache_slot + 1);
  }

  if (UNEXPECTED(zend_hash_num_elements(&ce->properties_info) == 0)
   || UNEXPECTED((zv = zend_hash_find(&ce->properties_info, member)) == NULL)) {
    if (UNEXPECTED(ZSTR_VAL(member)[0] == '\0') && ZSTR_LEN(member) != 0) {
      if (!silent) {
        zend_bad_property_name();
      }
      return ZEND_WRONG_PROPERTY_OFFSET;
    }
dynamic:
    if (cache_slot) {
      CACHE_POLYMORPHIC_PTR_EX(cache_slot, ce, (void*)ZEND_DYNAMIC_PROPERTY_OFFSET);
      CACHE_PTR_EX(cache_slot + 2, NULL);
    }
    return ZEND_DYNAMIC_PROPERTY_OFFSET;
  }

  property_info = (zend_property_info*)Z_PTR_P(zv);
  flags = property_info->flags;

  if (flags & (ZEND_ACC_CHANGED|ZEND_ACC_PRIVATE|ZEND_ACC_PROTECTED)) {
    zend_class_entry *scope = get_fake_or_executed_scope();

    if (property_info->ce != scope) {
      if (flags & ZEND_ACC_CHANGED) {
        zend_property_info *p = zend_get_parent_private_property(scope, ce, member);

        /* If there is a public/protected instance property on ce, don't try to use a
         * private static property on scope. If both are static, prefer the static
         * property on scope. This will throw a static property notice, rather than
         * a visibility error. */
        if (p && (!(p->flags & ZEND_ACC_STATIC) || (flags & ZEND_ACC_STATIC))) {
          property_info = p;
          flags = property_info->flags;
          goto found;
        } else if (flags & ZEND_ACC_PUBLIC) {
          goto found;
        }
      }
      if (flags & ZEND_ACC_PRIVATE) {
        if (property_info->ce != ce) {
          goto dynamic;
        } else {
wrong:
          /* Information was available, but we were denied access.  Error out. */
          if (!silent) {
            zend_bad_property_access(property_info, ce, member);
          }
          return ZEND_WRONG_PROPERTY_OFFSET;
        }
      } else {
        ZEND_ASSERT(flags & ZEND_ACC_PROTECTED);
        if (UNEXPECTED(!is_protected_compatible_scope(property_info->ce, scope))) {
          goto wrong;
        }
      }
    }
  }

found:
  if (UNEXPECTED(flags & ZEND_ACC_STATIC)) {
    if (!silent) {
      zend_error(E_NOTICE, "Accessing static property %s::$%s as non static", ZSTR_VAL(ce->name), ZSTR_VAL(member));
    }
    return ZEND_DYNAMIC_PROPERTY_OFFSET;
  }

  if (property_info->hooks) {
    *info_ptr = property_info;
    if (cache_slot) {
      CACHE_POLYMORPHIC_PTR_EX(cache_slot, ce, (void*)ZEND_HOOKED_PROPERTY_OFFSET);
      CACHE_PTR_EX(cache_slot + 2, property_info);
    }
    return ZEND_HOOKED_PROPERTY_OFFSET;
  }

  offset = property_info->offset;
  if (EXPECTED(!ZEND_TYPE_IS_SET(property_info->type))) {
    property_info = NULL;
  } else {
    *info_ptr = property_info;
  }
  if (cache_slot) {
    CACHE_POLYMORPHIC_PTR_EX(cache_slot, ce, (void*)(uintptr_t)offset);
    CACHE_PTR_EX(cache_slot + 2, property_info);
  }
  return offset;
}
/* }}} */

static ZEND_COLD void zend_wrong_offset(zend_class_entry *ce, zend_string *member) /* {{{ */
{
  const zend_property_info *dummy;

  /* Trigger the correct error */
  zend_get_property_offset(ce, member, 0, NULL, &dummy);
}
/* }}} */

ZEND_API zend_property_info *zend_get_property_info(const zend_class_entry *ce, zend_string *member, int silent) /* {{{ */
{
  zval *zv;
  zend_property_info *property_info;
  uint32_t flags;

  if (UNEXPECTED(zend_hash_num_elements(&ce->properties_info) == 0)
   || EXPECTED((zv = zend_hash_find(&ce->properties_info, member)) == NULL)) {
    if (UNEXPECTED(ZSTR_VAL(member)[0] == '\0') && ZSTR_LEN(member) != 0) {
      if (!silent) {
        zend_bad_property_name();
      }
      return ZEND_WRONG_PROPERTY_INFO;
    }
dynamic:
    return NULL;
  }

  property_info = (zend_property_info*)Z_PTR_P(zv);
  flags = property_info->flags;

  if (flags & (ZEND_ACC_CHANGED|ZEND_ACC_PRIVATE|ZEND_ACC_PROTECTED)) {
    zend_class_entry *scope = get_fake_or_executed_scope();
    if (property_info->ce != scope) {
      if (flags & ZEND_ACC_CHANGED) {
        zend_property_info *p = zend_get_parent_private_property(scope, ce, member);

        if (p) {
          property_info = p;
          flags = property_info->flags;
          goto found;
        } else if (flags & ZEND_ACC_PUBLIC) {
          goto found;
        }
      }
      if (flags & ZEND_ACC_PRIVATE) {
        if (property_info->ce != ce) {
          goto dynamic;
        } else {
wrong:
          /* Information was available, but we were denied access.  Error out. */
          if (!silent) {
            zend_bad_property_access(property_info, ce, member);
          }
          return ZEND_WRONG_PROPERTY_INFO;
        }
      } else {
        ZEND_ASSERT(flags & ZEND_ACC_PROTECTED);
        if (UNEXPECTED(!is_protected_compatible_scope(property_info->ce, scope))) {
          goto wrong;
        }
      }
    }
  }

found:
  if (UNEXPECTED(flags & ZEND_ACC_STATIC)) {
    if (!silent) {
      zend_error(E_NOTICE, "Accessing static property %s::$%s as non static", ZSTR_VAL(ce->name), ZSTR_VAL(member));
    }
  }
  return property_info;
}
/* }}} */

ZEND_API zend_result zend_check_property_access(const zend_object *zobj, zend_string *prop_info_name, bool is_dynamic) /* {{{ */
{
  zend_property_info *property_info;
  const char *class_name = NULL;
  const char *prop_name;
  zend_string *member;
  size_t prop_name_len;

  if (ZSTR_VAL(prop_info_name)[0] == 0) {
    if (is_dynamic) {
      return SUCCESS;
    }

    zend_unmangle_property_name_ex(prop_info_name, &class_name, &prop_name, &prop_name_len);
    member = zend_string_init(prop_name, prop_name_len, 0);
    property_info = zend_get_property_info(zobj->ce, member, 1);
    zend_string_release_ex(member, 0);
    if (property_info == NULL || property_info == ZEND_WRONG_PROPERTY_INFO) {
      return FAILURE;
    }

    if (class_name[0] != '*') {
      if (!(property_info->flags & ZEND_ACC_PRIVATE)) {
        /* we we're looking for a private prop but found a non private one of the same name */
        return FAILURE;
      } else if (strcmp(ZSTR_VAL(prop_info_name)+1, ZSTR_VAL(property_info->name)+1)) {
        /* we we're looking for a private prop but found a private one of the same name but another class */
        return FAILURE;
      }
    } else {
      ZEND_ASSERT(property_info->flags & ZEND_ACC_PROTECTED);
    }
    return SUCCESS;
  } else {
    property_info = zend_get_property_info(zobj->ce, prop_info_name, 1);
    if (property_info == NULL) {
      ZEND_ASSERT(is_dynamic);
      return SUCCESS;
    } else if (property_info == ZEND_WRONG_PROPERTY_INFO) {
      return FAILURE;
    }
    return (property_info->flags & ZEND_ACC_PUBLIC) ? SUCCESS : FAILURE;
  }
}
/* }}} */

ZEND_API bool ZEND_FASTCALL zend_asymmetric_property_has_set_access(const zend_property_info *prop_info) {
  ZEND_ASSERT(prop_info->flags & ZEND_ACC_PPP_SET_MASK);
  ZEND_ASSERT(!(prop_info->flags & ZEND_ACC_PUBLIC_SET));
  zend_class_entry *scope = get_fake_or_executed_scope();
  if (prop_info->ce == scope) {
    return true;
  }
  return EXPECTED((prop_info->flags & ZEND_ACC_PROTECTED_SET)
    && is_protected_compatible_scope(prop_info->ce, scope));
}

static void zend_property_guard_dtor(zval *el) /* {{{ */ {
  uint32_t *ptr = (uint32_t*)Z_PTR_P(el);
  if (EXPECTED(!(((uintptr_t)ptr) & 1))) {
    efree_size(ptr, sizeof(uint32_t));
  }
}
/* }}} */

static zend_always_inline zval *zend_get_guard_value(zend_object *zobj)
{
  return zobj->properties_table + zobj->ce->default_properties_count;
}

ZEND_API uint32_t *zend_get_property_guard(zend_object *zobj, zend_string *member) /* {{{ */
{
  HashTable *guards;
  zval *zv;
  uint32_t *ptr;


  ZEND_ASSERT(zobj->ce->ce_flags & ZEND_ACC_USE_GUARDS);
  zv = zend_get_guard_value(zobj);
  if (EXPECTED(Z_TYPE_P(zv) == IS_STRING)) {
    zend_string *str = Z_STR_P(zv);
    if (EXPECTED(str == member) ||
        /* str and member don't necessarily have a pre-calculated hash value here */
        EXPECTED(zend_string_equal_content(str, member))) {
      return &Z_GUARD_P(zv);
    } else if (EXPECTED(Z_GUARD_P(zv) == 0)) {
      zval_ptr_dtor_str(zv);
      ZVAL_STR_COPY(zv, member);
      return &Z_GUARD_P(zv);
    } else {
      ALLOC_HASHTABLE(guards);
      zend_hash_init(guards, 8, NULL, zend_property_guard_dtor, 0);
      /* mark pointer as "special" using low bit */
      zend_hash_add_new_ptr(guards, str,
        (void*)(((uintptr_t)&Z_GUARD_P(zv)) | 1));
      zval_ptr_dtor_str(zv);
      ZVAL_ARR(zv, guards);
    }
  } else if (EXPECTED(Z_TYPE_P(zv) == IS_ARRAY)) {
    guards = Z_ARRVAL_P(zv);
    ZEND_ASSERT(guards != NULL);
    zv = zend_hash_find(guards, member);
    if (zv != NULL) {
      return (uint32_t*)(((uintptr_t)Z_PTR_P(zv)) & ~1);
    }
  } else {
    ZEND_ASSERT(Z_TYPE_P(zv) == IS_UNDEF);
    ZVAL_STR_COPY(zv, member);
    Z_GUARD_P(zv) &= ~ZEND_GUARD_PROPERTY_MASK;
    return &Z_GUARD_P(zv);
  }
  /* we have to allocate uint32_t separately because ht->arData may be reallocated */
  ptr = (uint32_t*)emalloc(sizeof(uint32_t));
  *ptr = 0;
  return (uint32_t*)zend_hash_add_new_ptr(guards, member, ptr);
}
/* }}} */

ZEND_API uint32_t *zend_get_recursion_guard(zend_object *zobj)
{
  if (!(zobj->ce->ce_flags & ZEND_ACC_USE_GUARDS)) {
    return NULL;
  }
  zval *zv = zend_get_guard_value(zobj);
  return &Z_GUARD_P(zv);
}

ZEND_COLD static void zend_typed_property_uninitialized_access(const zend_property_info *prop_info, zend_string *name)
{
  zend_throw_error(NULL, "Typed property %s::$%s must not be accessed before initialization",
    ZSTR_VAL(prop_info->ce->name),
    ZSTR_VAL(name));
}

static ZEND_FUNCTION(zend_parent_hook_get_trampoline);
static ZEND_FUNCTION(zend_parent_hook_set_trampoline);

static bool zend_is_in_hook(const zend_property_info *prop_info)
{
  zend_execute_data *execute_data = EG(current_execute_data);
  if (!execute_data || !EX(func) || !EX(func)->common.prop_info) {
    return false;
  }

  const zend_property_info *parent_info = EX(func)->common.prop_info;
  ZEND_ASSERT(prop_info->prototype && parent_info->prototype);
  return prop_info->prototype == parent_info->prototype;
}

static bool zend_should_call_hook(const zend_property_info *prop_info, const zend_object *obj)
{
  if (!zend_is_in_hook(prop_info)) {
    return true;
  }

  /* execute_data and This are guaranteed to be set if zend_is_in_hook() returns true. */
  zend_object *parent_obj = Z_OBJ(EG(current_execute_data)->This);
  if (parent_obj == obj) {
    return false;
  }

  if (zend_object_is_lazy_proxy(parent_obj)
   && zend_lazy_object_initialized(parent_obj)
   && zend_lazy_object_get_instance(parent_obj) == obj) {
    return false;
  }

  return true;
}

static ZEND_COLD void zend_throw_no_prop_backing_value_access(zend_string *class_name, zend_string *prop_name, bool is_read)
{
  zend_throw_error(NULL, "Must not %s virtual property %s::$%s",
    is_read ? "read from" : "write to",
    ZSTR_VAL(class_name), ZSTR_VAL(prop_name));
}

static bool zend_call_get_hook(
  const zend_property_info *prop_info, zend_string *prop_name,
  zend_function *get, zend_object *zobj, zval *rv)
{
  if (!zend_should_call_hook(prop_info, zobj)) {
    if (UNEXPECTED(prop_info->flags & ZEND_ACC_VIRTUAL)) {
      zend_throw_no_prop_backing_value_access(zobj->ce->name, prop_name, /* is_read */ true);
    }
    return false;
  }

  zend_call_known_instance_method_with_0_params(get, zobj, rv);

  return true;
}

ZEND_API zval *zend_std_read_property(zend_object *zobj, zend_string *name, int type, void **cache_slot, zval *rv) /* {{{ */
{
  zval *retval;
  uintptr_t property_offset;
  const zend_property_info *prop_info = NULL;
  uint32_t *guard = NULL;

#if DEBUG_OBJECT_HANDLERS
  fprintf(stderr, "Read object #%d property: %s\n", zobj->handle, ZSTR_VAL(name));
#endif

  /* make zend_get_property_info silent if we have getter - we may want to use it */
  property_offset = zend_get_property_offset(zobj->ce, name, (type == BP_VAR_IS) || (zobj->ce->__get != NULL), cache_slot, &prop_info);

  if (EXPECTED(IS_VALID_PROPERTY_OFFSET(property_offset))) {
try_again:
    retval = OBJ_PROP(zobj, property_offset);

    if (prop_info && UNEXPECTED(prop_info->flags & (ZEND_ACC_READONLY|ZEND_ACC_PPP_SET_MASK))
     && (type == BP_VAR_W || type == BP_VAR_RW || type == BP_VAR_UNSET)
     && ((prop_info->flags & ZEND_ACC_READONLY) || !zend_asymmetric_property_has_set_access(prop_info))) {
      if (Z_TYPE_P(retval) == IS_OBJECT) {
        /* For objects, W/RW/UNSET fetch modes might not actually modify object.
         * Similar as with magic __get() allow them, but return the value as a copy
         * to make sure no actual modification is possible. */
        ZVAL_COPY(rv, retval);
        retval = rv;
        goto exit;
      } else if (Z_TYPE_P(retval) == IS_UNDEF && type == BP_VAR_UNSET) {
        retval = &EG(uninitialized_zval);
        goto exit;
      }
      if (prop_info->flags & ZEND_ACC_READONLY) {
        zend_readonly_property_indirect_modification_error(prop_info);
      } else {
        zend_asymmetric_visibility_property_modification_error(prop_info, "indirectly modify");
      }
      retval = &EG(uninitialized_zval);
      goto exit;
    }
    if (EXPECTED(Z_TYPE_P(retval) != IS_UNDEF)) {
      goto exit;
    }
    if (UNEXPECTED(Z_PROP_FLAG_P(retval) & IS_PROP_UNINIT)) {
      /* Skip __get() for uninitialized typed properties */
      goto uninit_error;
    }
  } else if (EXPECTED(IS_DYNAMIC_PROPERTY_OFFSET(property_offset))) {
    if (EXPECTED(zobj->properties != NULL)) {
      if (!IS_UNKNOWN_DYNAMIC_PROPERTY_OFFSET(property_offset)) {
        uintptr_t idx = ZEND_DECODE_DYN_PROP_OFFSET(property_offset);

        if (EXPECTED(idx < zobj->properties->nNumUsed * sizeof(Bucket))) {
          Bucket *p = (Bucket*)((char*)zobj->properties->arData + idx);

          if (EXPECTED(p->key == name) ||
                (EXPECTED(p->h == ZSTR_H(name)) &&
                 EXPECTED(p->key != NULL) &&
                 EXPECTED(zend_string_equal_content(p->key, name)))) {
            retval = &p->val;
            goto exit;
          }
        }
        CACHE_PTR_EX(cache_slot + 1, (void*)ZEND_DYNAMIC_PROPERTY_OFFSET);
      }
      retval = zend_hash_find(zobj->properties, name);
      if (EXPECTED(retval)) {
        if (cache_slot) {
          uintptr_t idx = (char*)retval - (char*)zobj->properties->arData;
          CACHE_PTR_EX(cache_slot + 1, (void*)ZEND_ENCODE_DYN_PROP_OFFSET(idx));
        }
        goto exit;
      }
    }
  } else if (IS_HOOKED_PROPERTY_OFFSET(property_offset)) {
    zend_function *get = prop_info->hooks[ZEND_PROPERTY_HOOK_GET];
    if (!get) {
      if (prop_info->flags & ZEND_ACC_VIRTUAL) {
        zend_throw_error(NULL, "Property %s::$%s is write-only",
          ZSTR_VAL(zobj->ce->name), ZSTR_VAL(name));
        return &EG(uninitialized_zval);
      }
      /* Cache the fact that this hook has trivial read. This only applies to
       * BP_VAR_R and BP_VAR_IS fetches. */
      ZEND_SET_PROPERTY_HOOK_SIMPLE_READ(cache_slot);

      retval = OBJ_PROP(zobj, prop_info->offset);
      if (UNEXPECTED(Z_TYPE_P(retval) == IS_UNDEF)) {
        /* As hooked properties can't be unset, the only way to end up with an undef
         * value is via an uninitialized property. */
        ZEND_ASSERT(Z_PROP_FLAG_P(retval) & IS_PROP_UNINIT);
        goto uninit_error;
      }

      if (UNEXPECTED(type == BP_VAR_W || type == BP_VAR_RW || type == BP_VAR_UNSET)) {
        if (UNEXPECTED(Z_TYPE_P(retval) != IS_OBJECT)) {
          zend_throw_error(NULL, "Indirect modification of %s::$%s is not allowed",
            ZSTR_VAL(zobj->ce->name), ZSTR_VAL(name));
          goto exit;
        }
        ZVAL_COPY(rv, retval);
        retval = rv;
      }
      goto exit;
    }

    zend_class_entry *ce = zobj->ce;

    if (!zend_call_get_hook(prop_info, name, get, zobj, rv)) {
      if (EG(exception)) {
        return &EG(uninitialized_zval);
      }

      /* Reads from backing store can only occur in hooks, and hence will always remain simple. */
      zend_execute_data *execute_data = EG(current_execute_data);
      if (cache_slot && EX(opline) && EX(opline)->opcode == ZEND_FETCH_OBJ_R && EX(opline)->op1_type == IS_UNUSED) {
        ZEND_SET_PROPERTY_HOOK_SIMPLE_READ(cache_slot);
      }

      property_offset = prop_info->offset;
      if (!ZEND_TYPE_IS_SET(prop_info->type)) {
        prop_info = NULL;
      }
      goto try_again;
    }

    if (EXPECTED(cache_slot
     && zend_execute_ex == execute_ex
     && ce->default_object_handlers->read_property == zend_std_read_property
     && !ce->create_object
     && !zend_is_in_hook(prop_info)
     && !(prop_info->hooks[ZEND_PROPERTY_HOOK_GET]->common.fn_flags & ZEND_ACC_RETURN_REFERENCE))) {
      ZEND_SET_PROPERTY_HOOK_SIMPLE_GET(cache_slot);
    }

    if (Z_TYPE_P(rv) != IS_UNDEF) {
      retval = rv;
      if (!Z_ISREF_P(rv)
       && (type == BP_VAR_W || type == BP_VAR_RW || type == BP_VAR_UNSET)
       && UNEXPECTED(Z_TYPE_P(rv) != IS_OBJECT)) {
        zend_throw_error(NULL, "Indirect modification of %s::$%s is not allowed",
          ZSTR_VAL(ce->name), ZSTR_VAL(name));
      }
    } else {
      retval = &EG(uninitialized_zval);
    }

    goto exit;
  } else if (UNEXPECTED(EG(exception))) {
    retval = &EG(uninitialized_zval);
    goto exit;
  }

  retval = &EG(uninitialized_zval);

  /* magic isset */
  if ((type == BP_VAR_IS) && zobj->ce->__isset) {
    zval tmp_result;
    guard = zend_get_property_guard(zobj, name);

    if (!((*guard) & IN_ISSET)) {
      GC_ADDREF(zobj);

      *guard |= IN_ISSET;
      zend_std_call_issetter(zobj, name, &tmp_result);
      *guard &= ~IN_ISSET;

      if (!zend_is_true(&tmp_result)) {
        retval = &EG(uninitialized_zval);
        OBJ_RELEASE(zobj);
        zval_ptr_dtor(&tmp_result);
        goto exit;
      }

      zval_ptr_dtor(&tmp_result);
      if (zobj->ce->__get && !((*guard) & IN_GET)) {
        goto call_getter;
      }
      OBJ_RELEASE(zobj);
    } else if (zobj->ce->__get && !((*guard) & IN_GET)) {
      goto call_getter_addref;
    }
  } else if (zobj->ce->__get) {
    /* magic get */
    guard = zend_get_property_guard(zobj, name);
    if (!((*guard) & IN_GET)) {
      /* have getter - try with it! */
call_getter_addref:
      GC_ADDREF(zobj);
call_getter:
      *guard |= IN_GET; /* prevent circular getting */
      zend_std_call_getter(zobj, name, rv);
      *guard &= ~IN_GET;

      if (Z_TYPE_P(rv) != IS_UNDEF) {
        retval = rv;
        if (!Z_ISREF_P(rv) &&
            (type == BP_VAR_W || type == BP_VAR_RW  || type == BP_VAR_UNSET)) {
          if (UNEXPECTED(Z_TYPE_P(rv) != IS_OBJECT)) {
            zend_error(E_NOTICE, "Indirect modification of overloaded property %s::$%s has no effect", ZSTR_VAL(zobj->ce->name), ZSTR_VAL(name));
          }
        }
      } else {
        retval = &EG(uninitialized_zval);
      }

      if (prop_info) {
        zend_verify_prop_assignable_by_ref_ex(prop_info, retval, (zobj->ce->__get->common.fn_flags & ZEND_ACC_STRICT_TYPES) != 0, ZEND_VERIFY_PROP_ASSIGNABLE_BY_REF_CONTEXT_MAGIC_GET);
      }

      OBJ_RELEASE(zobj);
      goto exit;
    } else if (UNEXPECTED(IS_WRONG_PROPERTY_OFFSET(property_offset))) {
      /* Trigger the correct error */
      zend_wrong_offset(zobj->ce, name);
      ZEND_ASSERT(EG(exception));
      retval = &EG(uninitialized_zval);
      goto exit;
    }
  }

uninit_error:
  if (UNEXPECTED(zend_lazy_object_must_init(zobj))) {
    if (!prop_info || (Z_PROP_FLAG_P(retval) & IS_PROP_LAZY)) {
      zobj = zend_lazy_object_init(zobj);
      if (!zobj) {
        retval = &EG(uninitialized_zval);
        goto exit;
      }

      if (UNEXPECTED(guard)) {
        uint32_t guard_type = (type == BP_VAR_IS) && zobj->ce->__isset
          ? IN_ISSET : IN_GET;
        guard = zend_get_property_guard(zobj, name);
        if (!((*guard) & guard_type)) {
          (*guard) |= guard_type;
          retval = zend_std_read_property(zobj, name, type, cache_slot, rv);
          (*guard) &= ~guard_type;
          return retval;
        }
      }

      return zend_std_read_property(zobj, name, type, cache_slot, rv);
    }
  }
  if (type != BP_VAR_IS) {
    if (prop_info) {
      zend_typed_property_uninitialized_access(prop_info, name);
    } else {
      zend_error(E_WARNING, "Undefined property: %s::$%s", ZSTR_VAL(zobj->ce->name), ZSTR_VAL(name));
    }
  }
  retval = &EG(uninitialized_zval);

exit:
  return retval;
}
/* }}} */

static zend_always_inline bool property_uses_strict_types(void) {
  zend_execute_data *execute_data = EG(current_execute_data);
  return execute_data
    && execute_data->func
    && ZEND_CALL_USES_STRICT_TYPES(EG(current_execute_data));
}

static zval *forward_write_to_lazy_object(zend_object *zobj,
    zend_string *name, zval *value, void **cache_slot, bool guarded)
{
  zval *variable_ptr;

  /* backup value as it may change during initialization */
  zval backup;
  ZVAL_COPY(&backup, value);

  zend_object *instance = zend_lazy_object_init(zobj);
  if (UNEXPECTED(!instance)) {
    zval_ptr_dtor(&backup);
    return &EG(error_zval);
  }

  if (UNEXPECTED(guarded)) {
    uint32_t *guard = zend_get_property_guard(instance, name);
    if (!((*guard) & IN_SET)) {
      (*guard) |= IN_SET;
      variable_ptr = zend_std_write_property(instance, name, &backup, cache_slot);
      (*guard) &= ~IN_SET;
      goto exit;
    }
  }

  variable_ptr = zend_std_write_property(instance, name, &backup, cache_slot);

exit:
  zval_ptr_dtor(&backup);

  if (variable_ptr == &backup) {
    variable_ptr = value;
  }

  return variable_ptr;
}

ZEND_API zval *zend_std_write_property(zend_object *zobj, zend_string *name, zval *value, void **cache_slot) /* {{{ */
{
  zval *variable_ptr, tmp;
  uintptr_t property_offset;
  const zend_property_info *prop_info = NULL;
  uint32_t *guard = NULL;
  ZEND_ASSERT(!Z_ISREF_P(value));

  property_offset = zend_get_property_offset(zobj->ce, name, (zobj->ce->__set != NULL), cache_slot, &prop_info);

  if (EXPECTED(IS_VALID_PROPERTY_OFFSET(property_offset))) {
try_again:
    variable_ptr = OBJ_PROP(zobj, property_offset);

    if (prop_info && UNEXPECTED(prop_info->flags & (ZEND_ACC_READONLY|ZEND_ACC_PPP_SET_MASK))) {
      bool error;
      if (Z_TYPE_P(variable_ptr) != IS_UNDEF || (Z_PROP_FLAG_P(variable_ptr) & IS_PROP_UNINIT) || !zobj->ce->__set) {
        error = true;
      } else {
        guard = zend_get_property_guard(zobj, name);
        error = (*guard) & IN_SET;
      }
      if (error) {
        if ((prop_info->flags & ZEND_ACC_READONLY)
         && Z_TYPE_P(variable_ptr) != IS_UNDEF
         && !(Z_PROP_FLAG_P(variable_ptr) & IS_PROP_REINITABLE)) {
          zend_readonly_property_modification_error(prop_info);
          variable_ptr = &EG(error_zval);
          goto exit;
        }
        if ((prop_info->flags & ZEND_ACC_PPP_SET_MASK) && !zend_asymmetric_property_has_set_access(prop_info)) {
          zend_asymmetric_visibility_property_modification_error(prop_info, "modify");
          variable_ptr = &EG(error_zval);
          goto exit;
        }
      }
    }

    if (Z_TYPE_P(variable_ptr) != IS_UNDEF) {
      Z_TRY_ADDREF_P(value);

      if (prop_info) {
typed_property:
        ZVAL_COPY_VALUE(&tmp, value);
        // Increase refcount to prevent object from being released in __toString()
        GC_ADDREF(zobj);
        bool type_matched = zend_verify_property_type(prop_info, &tmp, property_uses_strict_types());
        if (UNEXPECTED(GC_DELREF(zobj) == 0)) {
          zend_object_released_while_assigning_to_property_error(prop_info);
          zend_objects_store_del(zobj);
          zval_ptr_dtor(&tmp);
          variable_ptr = &EG(error_zval);
          goto exit;
        }
        if (UNEXPECTED(!type_matched)) {
          zval_ptr_dtor(&tmp);
          variable_ptr = &EG(error_zval);
          goto exit;
        }
        Z_PROP_FLAG_P(variable_ptr) &= ~(IS_PROP_UNINIT|IS_PROP_REINITABLE);
        value = &tmp;
      }

found:;
      zend_refcounted *garbage = NULL;

      variable_ptr = zend_assign_to_variable_ex(
        variable_ptr, value, IS_TMP_VAR, property_uses_strict_types(), &garbage);

      if (garbage) {
        if (GC_DELREF(garbage) == 0) {
          zend_execute_data *execute_data = EG(current_execute_data);
          // Assign to result variable before calling the destructor as it may release the object
          if (execute_data
           && EX(func)
           && ZEND_USER_CODE(EX(func)->common.type)
           && EX(opline)
           && EX(opline)->opcode == ZEND_ASSIGN_OBJ
           && EX(opline)->result_type) {
            ZVAL_COPY_DEREF(EX_VAR(EX(opline)->result.var), variable_ptr);
            variable_ptr = NULL;
          }
          rc_dtor_func(garbage);
        } else {
          gc_check_possible_root_no_ref(garbage);
        }
      }
      goto exit;
    }
    if (Z_PROP_FLAG_P(variable_ptr) & IS_PROP_UNINIT) {
      if (UNEXPECTED(zend_lazy_object_must_init(zobj))) {
        if (Z_PROP_FLAG_P(variable_ptr) & IS_PROP_LAZY) {
          goto lazy_init;
        }
      }
      /* Writes to uninitialized typed properties bypass __set(). */
      goto write_std_property;
    }
  } else if (EXPECTED(IS_DYNAMIC_PROPERTY_OFFSET(property_offset))) {
    if (EXPECTED(zobj->properties != NULL)) {
      if (UNEXPECTED(GC_REFCOUNT(zobj->properties) > 1)) {
        if (EXPECTED(!(GC_FLAGS(zobj->properties) & IS_ARRAY_IMMUTABLE))) {
          GC_DELREF(zobj->properties);
        }
        zobj->properties = zend_array_dup(zobj->properties);
      }
      if ((variable_ptr = zend_hash_find(zobj->properties, name)) != NULL) {
        Z_TRY_ADDREF_P(value);
        goto found;
      }
    }
  } else if (IS_HOOKED_PROPERTY_OFFSET(property_offset)) {
    zend_function *set = prop_info->hooks[ZEND_PROPERTY_HOOK_SET];

    if (!set) {
      if (prop_info->flags & ZEND_ACC_VIRTUAL) {
        zend_throw_error(NULL, "Property %s::$%s is read-only", ZSTR_VAL(zobj->ce->name), ZSTR_VAL(name));
        variable_ptr = &EG(error_zval);
        goto exit;
      }
      ZEND_SET_PROPERTY_HOOK_SIMPLE_WRITE(cache_slot);
      property_offset = prop_info->offset;
      if (!ZEND_TYPE_IS_SET(prop_info->type)) {
        prop_info = NULL;
      }
      goto try_again;
    }

    if (!zend_should_call_hook(prop_info, zobj)) {
      if (prop_info->flags & ZEND_ACC_VIRTUAL) {
        zend_throw_no_prop_backing_value_access(zobj->ce->name, name, /* is_read */ false);
        variable_ptr = &EG(error_zval);
        goto exit;
      }

      /* Writes to backing store can only occur in hooks, and hence will always remain simple. */
      zend_execute_data *execute_data = EG(current_execute_data);
      if (cache_slot && EX(opline) && EX(opline)->opcode == ZEND_ASSIGN_OBJ && EX(opline)->op1_type == IS_UNUSED) {
        ZEND_SET_PROPERTY_HOOK_SIMPLE_WRITE(cache_slot);
      }

      property_offset = prop_info->offset;
      if (!ZEND_TYPE_IS_SET(prop_info->type)) {
        prop_info = NULL;
      }
      goto try_again;
    }

    if (UNEXPECTED(prop_info->flags & ZEND_ACC_PPP_SET_MASK
     && !zend_asymmetric_property_has_set_access(prop_info))) {
      zend_asymmetric_visibility_property_modification_error(prop_info, "modify");
      variable_ptr = &EG(error_zval);
      goto exit;
    }

    GC_ADDREF(zobj);
    zend_call_known_instance_method_with_1_params(set, zobj, NULL, value);
    OBJ_RELEASE(zobj);

    variable_ptr = value;
    goto exit;
  } else if (UNEXPECTED(EG(exception))) {
    variable_ptr = &EG(error_zval);
    goto exit;
  }

  /* magic set */
  if (zobj->ce->__set) {
    if (!guard) {
      guard = zend_get_property_guard(zobj, name);
    }

    if (!((*guard) & IN_SET)) {
      GC_ADDREF(zobj);
      (*guard) |= IN_SET; /* prevent circular setting */
      zend_std_call_setter(zobj, name, value);
      (*guard) &= ~IN_SET;
      OBJ_RELEASE(zobj);
      variable_ptr = value;
    } else if (EXPECTED(!IS_WRONG_PROPERTY_OFFSET(property_offset))) {
      if (UNEXPECTED(zend_lazy_object_must_init(zobj))) {
        return forward_write_to_lazy_object(zobj, name, value,
            cache_slot, /* guarded */ true);
      }

      goto write_std_property;
    } else {
      /* Trigger the correct error */
      zend_wrong_offset(zobj->ce, name);
      ZEND_ASSERT(EG(exception));
      variable_ptr = &EG(error_zval);
      goto exit;
    }
  } else {
    ZEND_ASSERT(!IS_WRONG_PROPERTY_OFFSET(property_offset));
    if (UNEXPECTED(zend_lazy_object_must_init(zobj))) {
      goto lazy_init;
    }
write_std_property:
    if (EXPECTED(IS_VALID_PROPERTY_OFFSET(property_offset))) {
      variable_ptr = OBJ_PROP(zobj, property_offset);

      Z_TRY_ADDREF_P(value);
      if (prop_info) {
        goto typed_property;
      }

      ZVAL_COPY_VALUE(variable_ptr, value);
    } else {
      if (UNEXPECTED(zobj->ce->ce_flags & ZEND_ACC_NO_DYNAMIC_PROPERTIES)) {
        zend_forbidden_dynamic_property(zobj->ce, name);
        variable_ptr = &EG(error_zval);
        goto exit;
      }
      if (UNEXPECTED(!(zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES))) {
        if (UNEXPECTED(!zend_deprecated_dynamic_property(zobj, name))) {
          variable_ptr = &EG(error_zval);
          goto exit;
        }
      }

      Z_TRY_ADDREF_P(value);
      variable_ptr = zend_hash_add_new(zend_std_get_properties(zobj), name, value);
    }
  }

exit:
  return variable_ptr;

lazy_init:
  return forward_write_to_lazy_object(zobj, name, value, cache_slot,
      /* guarded */ false);
}
/* }}} */

static ZEND_COLD zend_never_inline void zend_bad_array_access(zend_class_entry *ce) /* {{{ */
{
  zend_throw_error(NULL, "Cannot use object of type %s as array", ZSTR_VAL(ce->name));
}
/* }}} */

ZEND_API zval *zend_std_read_dimension(zend_object *object, zval *offset, int type, zval *rv) /* {{{ */
{
  zend_class_entry *ce = object->ce;
  zval tmp_offset;

  /* arrayaccess_funcs_ptr is set if (and only if) the class implements zend_ce_arrayaccess */
  zend_class_arrayaccess_funcs *funcs = ce->arrayaccess_funcs_ptr;
  if (EXPECTED(funcs)) {
    if (offset == NULL) {
      /* [] construct */
      ZVAL_NULL(&tmp_offset);
    } else {
      ZVAL_COPY_DEREF(&tmp_offset, offset);
    }

    GC_ADDREF(object);
    if (type == BP_VAR_IS) {
      zend_call_known_instance_method_with_1_params(funcs->zf_offsetexists, object, rv, &tmp_offset);
      if (UNEXPECTED(Z_ISUNDEF_P(rv))) {
        OBJ_RELEASE(object);
        zval_ptr_dtor(&tmp_offset);
        return NULL;
      }
      if (!i_zend_is_true(rv)) {
        OBJ_RELEASE(object);
        zval_ptr_dtor(&tmp_offset);
        zval_ptr_dtor(rv);
        return &EG(uninitialized_zval);
      }
      zval_ptr_dtor(rv);
    }

    zend_call_known_instance_method_with_1_params(funcs->zf_offsetget, object, rv, &tmp_offset);

    OBJ_RELEASE(object);
    zval_ptr_dtor(&tmp_offset);

    if (UNEXPECTED(Z_TYPE_P(rv) == IS_UNDEF)) {
      if (UNEXPECTED(!EG(exception))) {
        zend_throw_error(NULL, "Undefined offset for object of type %s used as array", ZSTR_VAL(ce->name));
      }
      return NULL;
    }
    return rv;
  } else {
      zend_bad_array_access(ce);
    return NULL;
  }
}
/* }}} */

ZEND_API void zend_std_write_dimension(zend_object *object, zval *offset, zval *value) /* {{{ */
{
  zend_class_entry *ce = object->ce;
  zval tmp_offset;

  zend_class_arrayaccess_funcs *funcs = ce->arrayaccess_funcs_ptr;
  if (EXPECTED(funcs)) {
    if (!offset) {
      ZVAL_NULL(&tmp_offset);
    } else {
      ZVAL_COPY_DEREF(&tmp_offset, offset);
    }
    GC_ADDREF(object);
    zend_call_known_instance_method_with_2_params(funcs->zf_offsetset, object, NULL, &tmp_offset, value);
    OBJ_RELEASE(object);
    zval_ptr_dtor(&tmp_offset);
  } else {
      zend_bad_array_access(ce);
  }
}
/* }}} */

// todo: make zend_std_has_dimension return bool as well
ZEND_API int zend_std_has_dimension(zend_object *object, zval *offset, int check_empty) /* {{{ */
{
  zend_class_entry *ce = object->ce;
  zval retval, tmp_offset;
  bool result;

  zend_class_arrayaccess_funcs *funcs = ce->arrayaccess_funcs_ptr;
  if (EXPECTED(funcs)) {
    ZVAL_COPY_DEREF(&tmp_offset, offset);
    GC_ADDREF(object);
    zend_call_known_instance_method_with_1_params(funcs->zf_offsetexists, object, &retval, &tmp_offset);
    result = i_zend_is_true(&retval);
    zval_ptr_dtor(&retval);
    if (check_empty && result && EXPECTED(!EG(exception))) {
      zend_call_known_instance_method_with_1_params(funcs->zf_offsetget, object, &retval, &tmp_offset);
      result = i_zend_is_true(&retval);
      zval_ptr_dtor(&retval);
    }
    OBJ_RELEASE(object);
    zval_ptr_dtor(&tmp_offset);
  } else {
      zend_bad_array_access(ce);
    return 0;
  }

  return result;
}
/* }}} */

ZEND_API zval *zend_std_get_property_ptr_ptr(zend_object *zobj, zend_string *name, int type, void **cache_slot) /* {{{ */
{
  zval *retval = NULL;
  uintptr_t property_offset;
  const zend_property_info *prop_info = NULL;

#if DEBUG_OBJECT_HANDLERS
  fprintf(stderr, "Ptr object #%d property: %s\n", zobj->handle, ZSTR_VAL(name));
#endif

  property_offset = zend_get_property_offset(zobj->ce, name, (zobj->ce->__get != NULL), cache_slot, &prop_info);

  if (EXPECTED(IS_VALID_PROPERTY_OFFSET(property_offset))) {
    retval = OBJ_PROP(zobj, property_offset);
    if (UNEXPECTED(Z_TYPE_P(retval) == IS_UNDEF)) {
      if (EXPECTED(!zobj->ce->__get) ||
          UNEXPECTED((*zend_get_property_guard(zobj, name)) & IN_GET) ||
          UNEXPECTED(prop_info && (Z_PROP_FLAG_P(retval) & IS_PROP_UNINIT))) {
        if (UNEXPECTED(zend_lazy_object_must_init(zobj) && (Z_PROP_FLAG_P(retval) & IS_PROP_LAZY))) {
          zobj = zend_lazy_object_init(zobj);
          if (!zobj) {
            return &EG(error_zval);
          }

          return zend_std_get_property_ptr_ptr(zobj, name, type, cache_slot);
        }
        if (UNEXPECTED(type == BP_VAR_RW || type == BP_VAR_R)) {
          if (prop_info) {
            zend_typed_property_uninitialized_access(prop_info, name);
            retval = &EG(error_zval);
          } else {
            zend_error(E_WARNING, "Undefined property: %s::$%s", ZSTR_VAL(zobj->ce->name), ZSTR_VAL(name));
            /* An error handler may set the property */
             if (EXPECTED(Z_TYPE_P(retval) == IS_UNDEF)) {
              ZVAL_NULL(retval);
             }
          }
        } else if (prop_info && UNEXPECTED(prop_info->flags & (ZEND_ACC_READONLY|ZEND_ACC_PPP_SET_MASK))) {
          if ((prop_info->flags & ZEND_ACC_READONLY) || !zend_asymmetric_property_has_set_access(prop_info)) {
            retval = NULL;
          }
        } else if (!prop_info || !ZEND_TYPE_IS_SET(prop_info->type)) {
          ZVAL_NULL(retval);
        }
      } else {
        /* we do have getter - fail and let it try again with usual get/set */
        retval = NULL;
      }
    } else if (prop_info && UNEXPECTED(prop_info->flags & (ZEND_ACC_READONLY|ZEND_ACC_PPP_SET_MASK))) {
      if ((prop_info->flags & ZEND_ACC_READONLY) || !zend_asymmetric_property_has_set_access(prop_info)) {
        retval = NULL;
      }
    }
  } else if (EXPECTED(IS_DYNAMIC_PROPERTY_OFFSET(property_offset))) {
    if (EXPECTED(zobj->properties)) {
      if (UNEXPECTED(GC_REFCOUNT(zobj->properties) > 1)) {
        if (EXPECTED(!(GC_FLAGS(zobj->properties) & IS_ARRAY_IMMUTABLE))) {
          GC_DELREF(zobj->properties);
        }
        zobj->properties = zend_array_dup(zobj->properties);
      }
        if (EXPECTED((retval = zend_hash_find(zobj->properties, name)) != NULL)) {
        return retval;
        }
    }
    if (EXPECTED(!zobj->ce->__get) ||
        UNEXPECTED((*zend_get_property_guard(zobj, name)) & IN_GET)) {
      if (UNEXPECTED(zobj->ce->ce_flags & ZEND_ACC_NO_DYNAMIC_PROPERTIES)) {
        zend_forbidden_dynamic_property(zobj->ce, name);
        return &EG(error_zval);
      }
      if (UNEXPECTED(!(zobj->ce->ce_flags & ZEND_ACC_ALLOW_DYNAMIC_PROPERTIES))) {
        if (UNEXPECTED(!zend_deprecated_dynamic_property(zobj, name))) {
          return &EG(error_zval);
        }
      }
      if (UNEXPECTED(zend_lazy_object_must_init(zobj))) {
        zobj = zend_lazy_object_init(zobj);
        if (!zobj) {
          return &EG(error_zval);
        }

        return zend_std_get_property_ptr_ptr(zobj, name, type, cache_slot);
      }
      if (UNEXPECTED(!zobj->properties)) {
        rebuild_object_properties_internal(zobj);
      }
      if (UNEXPECTED(type == BP_VAR_RW || type == BP_VAR_R)) {
        zend_error(E_WARNING, "Undefined property: %s::$%s", ZSTR_VAL(zobj->ce->name), ZSTR_VAL(name));
      }
      retval = zend_hash_add(zobj->properties, name, &EG(uninitialized_zval));
    }
  } else if (!IS_HOOKED_PROPERTY_OFFSET(property_offset) && zobj->ce->__get == NULL) {
    retval = &EG(error_zval);
  }

  return retval;
}
/* }}} */

ZEND_API void zend_std_unset_property(zend_object *zobj, zend_string *name, void **cache_slot) /* {{{ */
{
  uintptr_t property_offset;
  const zend_property_info *prop_info = NULL;
  uint32_t *guard = NULL;

  property_offset = zend_get_property_offset(zobj->ce, name, (zobj->ce->__unset != NULL), cache_slot, &prop_info);

  if (EXPECTED(IS_VALID_PROPERTY_OFFSET(property_offset))) {
    zval *slot = OBJ_PROP(zobj, property_offset);

    if (prop_info && UNEXPECTED(prop_info->flags & (ZEND_ACC_READONLY|ZEND_ACC_PPP_SET_MASK))) {
      bool error;
      if (Z_TYPE_P(slot) != IS_UNDEF || Z_PROP_FLAG_P(slot) & IS_PROP_UNINIT || !zobj->ce->__unset) {
        error = true;
      } else {
        guard = zend_get_property_guard(zobj, name);
        error = (*guard) & IN_UNSET;
      }
      if (error) {
        if ((prop_info->flags & ZEND_ACC_READONLY)
         && Z_TYPE_P(slot) != IS_UNDEF
         && !(Z_PROP_FLAG_P(slot) & IS_PROP_REINITABLE)) {
          zend_readonly_property_unset_error(prop_info->ce, name);
          return;
        }
        if ((prop_info->flags & ZEND_ACC_PPP_SET_MASK) && !zend_asymmetric_property_has_set_access(prop_info)) {
          zend_asymmetric_visibility_property_modification_error(prop_info, "unset");
          return;
        }
      }
    }

    if (Z_TYPE_P(slot) != IS_UNDEF) {
      if (UNEXPECTED(Z_ISREF_P(slot)) &&
          (ZEND_DEBUG || ZEND_REF_HAS_TYPE_SOURCES(Z_REF_P(slot)))) {
        if (prop_info) {
          ZEND_REF_DEL_TYPE_SOURCE(Z_REF_P(slot), prop_info);
        }
      }
      zval tmp;
      ZVAL_COPY_VALUE(&tmp, slot);
      ZVAL_UNDEF(slot);
      zval_ptr_dtor(&tmp);
      if (zobj->properties) {
        HT_FLAGS(zobj->properties) |= HASH_FLAG_HAS_EMPTY_IND;
      }
      return;
    }
    if (UNEXPECTED(Z_PROP_FLAG_P(slot) & IS_PROP_UNINIT)) {
      if (UNEXPECTED(zend_lazy_object_must_init(zobj) && (Z_PROP_FLAG_P(slot) & IS_PROP_LAZY))) {
        zobj = zend_lazy_object_init(zobj);
        if (!zobj) {
          return;
        }
        zend_std_unset_property(zobj, name, cache_slot);
        return;
      }

      /* Reset the IS_PROP_UNINIT flag, if it exists and bypass __unset(). */
      Z_PROP_FLAG_P(slot) = 0;
      return;
    }
  } else if (EXPECTED(IS_DYNAMIC_PROPERTY_OFFSET(property_offset))
   && EXPECTED(zobj->properties != NULL)) {
    if (UNEXPECTED(GC_REFCOUNT(zobj->properties) > 1)) {
      if (EXPECTED(!(GC_FLAGS(zobj->properties) & IS_ARRAY_IMMUTABLE))) {
        GC_DELREF(zobj->properties);
      }
      zobj->properties = zend_array_dup(zobj->properties);
    }
    if (EXPECTED(zend_hash_del(zobj->properties, name) != FAILURE)) {
      return;
    }
  } else if (IS_HOOKED_PROPERTY_OFFSET(property_offset)) {
    zend_throw_error(NULL, "Cannot unset hooked property %s::$%s",
      ZSTR_VAL(zobj->ce->name), ZSTR_VAL(name));
    return;
  } else if (UNEXPECTED(EG(exception))) {
    return;
  }

  /* magic unset */
  if (zobj->ce->__unset) {
    if (!guard) {
      guard = zend_get_property_guard(zobj, name);
    }
    if (!((*guard) & IN_UNSET)) {
      /* have unsetter - try with it! */
      (*guard) |= IN_UNSET; /* prevent circular unsetting */
      zend_std_call_unsetter(zobj, name);
      (*guard) &= ~IN_UNSET;
      return;
    } else if (UNEXPECTED(IS_WRONG_PROPERTY_OFFSET(property_offset))) {
      /* Trigger the correct error */
      zend_wrong_offset(zobj->ce, name);
      ZEND_ASSERT(EG(exception));
      return;
    } else {
      /* Nothing to do: The property already does not exist. */
    }
  }

  if (UNEXPECTED(zend_lazy_object_must_init(zobj))) {
    zobj = zend_lazy_object_init(zobj);
    if (!zobj) {
      return;
    }

    if (UNEXPECTED(guard)) {
      guard = zend_get_property_guard(zobj, name);
      if (!((*guard) & IN_UNSET)) {
        (*guard) |= IN_UNSET;
        zend_std_unset_property(zobj, name, cache_slot);
        (*guard) &= ~IN_UNSET;
        return;
      }
    }

    zend_std_unset_property(zobj, name, cache_slot);
    return;
  }
}
/* }}} */

ZEND_API void zend_std_unset_dimension(zend_object *object, zval *offset) /* {{{ */
{
  zend_class_entry *ce = object->ce;
  zval tmp_offset;

  zend_class_arrayaccess_funcs *funcs = ce->arrayaccess_funcs_ptr;
  if (EXPECTED(funcs)) {
    ZVAL_COPY_DEREF(&tmp_offset, offset);
    GC_ADDREF(object);
    zend_call_known_instance_method_with_1_params(funcs->zf_offsetunset, object, NULL, &tmp_offset);
    OBJ_RELEASE(object);
    zval_ptr_dtor(&tmp_offset);
  } else {
      zend_bad_array_access(ce);
  }
}
/* }}} */

static zend_never_inline zend_function *zend_get_parent_private_method(zend_class_entry *scope, zend_class_entry *ce, zend_string *function_name) /* {{{ */
{
  zval *func;
  zend_function *fbc;

  if (scope != ce && scope && is_derived_class(ce, scope)) {
    func = zend_hash_find(&scope->function_table, function_name);
    if (func != NULL) {
      fbc = Z_FUNC_P(func);
      if ((fbc->common.fn_flags & ZEND_ACC_PRIVATE)
       && fbc->common.scope == scope) {
        return fbc;
      }
    }
  }
  return NULL;
}
/* }}} */

/* Ensures that we're allowed to call a protected method.
 */
ZEND_API bool zend_check_protected(const zend_class_entry *ce, const zend_class_entry *scope) /* {{{ */
{
  const zend_class_entry *fbc_scope = ce;

  /* Is the context that's calling the function, the same as one of
   * the function's parents?
   */
  while (fbc_scope) {
    if (fbc_scope==scope) {
      return 1;
    }
    fbc_scope = fbc_scope->parent;
  }

  /* Is the function's scope the same as our current object context,
   * or any of the parents of our context?
   */
  while (scope) {
    if (scope==ce) {
      return 1;
    }
    scope = scope->parent;
  }
  return 0;
}
/* }}} */

ZEND_API zend_function *zend_get_call_trampoline_func(const zend_class_entry *ce, zend_string *method_name, bool is_static) /* {{{ */
{
  size_t mname_len;
  zend_op_array *func;
  zend_function *fbc = is_static ? ce->__callstatic : ce->__call;
  /* We use non-NULL value to avoid useless run_time_cache allocation.
   * The low bit must be zero, to not be interpreted as a MAP_PTR offset.
   */
  static const void *dummy = (void*)(intptr_t)2;
  static const zend_arg_info arg_info[1] = {{0}};

  ZEND_ASSERT(fbc);

  if (EXPECTED(EG(trampoline).common.function_name == NULL)) {
    func = &EG(trampoline).op_array;
  } else {
    func = ecalloc(1, sizeof(zend_op_array));
  }

  func->type = ZEND_USER_FUNCTION;
  func->arg_flags[0] = 0;
  func->arg_flags[1] = 0;
  func->arg_flags[2] = 0;
  func->fn_flags = ZEND_ACC_CALL_VIA_TRAMPOLINE
    | ZEND_ACC_PUBLIC
    | ZEND_ACC_VARIADIC
    | (fbc->common.fn_flags & (ZEND_ACC_RETURN_REFERENCE|ZEND_ACC_ABSTRACT|ZEND_ACC_DEPRECATED|ZEND_ACC_NODISCARD));
  /* Attributes outlive the trampoline because they are created by the compiler. */
  func->attributes = fbc->common.attributes;
  if (is_static) {
    func->fn_flags |= ZEND_ACC_STATIC;
  }
  func->opcodes = &EG(call_trampoline_op);
  ZEND_MAP_PTR_INIT(func->run_time_cache, (void**)dummy);
  func->scope = fbc->common.scope;
  /* reserve space for arguments, local and temporary variables */
  /* EG(trampoline) is reused from other places, like FFI (e.g. zend_ffi_cdata_get_closure()) where
   * it is used as an internal function. It may set fields that don't belong to common, thus
   * modifying zend_op_array specific data, most significantly last_var. We need to reset this
   * value so that it doesn't contain garbage when the engine allocates space for the next stack
   * frame. This didn't cause any issues until now due to "lucky" structure layout. */
  func->last_var = 0;
  uint32_t min_T = 2 + ZEND_OBSERVER_ENABLED;
  func->T = (fbc->type == ZEND_USER_FUNCTION)? MAX(fbc->op_array.last_var + fbc->op_array.T, min_T) : min_T;
  func->filename = (fbc->type == ZEND_USER_FUNCTION)? fbc->op_array.filename : ZSTR_EMPTY_ALLOC();
  func->line_start = (fbc->type == ZEND_USER_FUNCTION)? fbc->op_array.line_start : 0;
  func->line_end = (fbc->type == ZEND_USER_FUNCTION)? fbc->op_array.line_end : 0;

  //??? keep compatibility for "\0" characters
  //??? see: Zend/tests/bug46238.phpt
  if (UNEXPECTED((mname_len = strlen(ZSTR_VAL(method_name))) != ZSTR_LEN(method_name))) {
    func->function_name = zend_string_init(ZSTR_VAL(method_name), mname_len, 0);
  } else {
    func->function_name = zend_string_copy(method_name);
  }

  func->prototype = NULL;
  func->prop_info = NULL;
  func->num_args = 0;
  func->required_num_args = 0;
  func->arg_info = (zend_arg_info *) arg_info;

  return (zend_function*)func;
}
/* }}} */

static ZEND_FUNCTION(zend_parent_hook_get_trampoline)
{
  zend_object *obj = Z_PTR_P(ZEND_THIS);
  zend_string *prop_name = EX(func)->internal_function.reserved[0];

  if (UNEXPECTED(ZEND_NUM_ARGS() != 0)) {
    zend_wrong_parameters_none_error();
    goto clean;
  }

  zval rv;
  zval *retval = obj->handlers->read_property(obj, prop_name, BP_VAR_R, NULL, &rv);
  if (retval == &rv) {
    RETVAL_COPY_VALUE(retval);
  } else {
    RETVAL_COPY(retval);
  }

clean:
  zend_string_release(EX(func)->common.function_name);
  zend_free_trampoline(EX(func));
  EX(func) = NULL;
}

static ZEND_FUNCTION(zend_parent_hook_set_trampoline)
{
  zend_object *obj = Z_PTR_P(ZEND_THIS);
  zend_string *prop_name = EX(func)->internal_function.reserved[0];

  zval *value;

  ZEND_PARSE_PARAMETERS_START(1, 1)
    Z_PARAM_ZVAL(value)
  ZEND_PARSE_PARAMETERS_END_EX(goto clean);

  RETVAL_COPY(obj->handlers->write_property(obj, prop_name, value, NULL));

clean:
  zend_string_release(EX(func)->common.function_name);
  zend_free_trampoline(EX(func));
  EX(func) = NULL;
}

ZEND_API zend_function *zend_get_property_hook_trampoline(
  const zend_property_info *prop_info,
  zend_property_hook_kind kind, zend_string *prop_name)
{
  static const zend_arg_info arg_info[1] = {{0}};
  zend_function *func;
  if (EXPECTED(EG(trampoline).common.function_name == NULL)) {
    func = &EG(trampoline);
  } else {
    func = (zend_function *)(uintptr_t)ecalloc(1, sizeof(zend_internal_function));
  }
  func->type = ZEND_INTERNAL_FUNCTION;
  /* This trampoline does not use the call_trampoline_op, so it won't reuse the call frame,
   * which means we don't even need to reserve a temporary for observers. */
  func->common.T = 0;
  func->common.arg_flags[0] = 0;
  func->common.arg_flags[1] = 0;
  func->common.arg_flags[2] = 0;
  func->common.fn_flags = ZEND_ACC_CALL_VIA_TRAMPOLINE;
  func->common.function_name = zend_string_concat3(
    "$", 1, ZSTR_VAL(prop_name), ZSTR_LEN(prop_name),
    kind == ZEND_PROPERTY_HOOK_GET ? "::get" : "::set", 5);
  /* set to 0 to avoid arg_info[] allocation, because all values are passed by value anyway */
  uint32_t args = kind == ZEND_PROPERTY_HOOK_GET ? 0 : 1;
  func->common.num_args = args;
  func->common.required_num_args = args;
  func->common.scope = prop_info->ce;
  func->common.prototype = NULL;
  func->common.prop_info = prop_info;
  func->common.arg_info = (zend_arg_info *) arg_info;
  func->internal_function.handler = kind == ZEND_PROPERTY_HOOK_GET
    ? ZEND_FN(zend_parent_hook_get_trampoline)
    : ZEND_FN(zend_parent_hook_set_trampoline);
  func->internal_function.module = NULL;

  func->internal_function.reserved[0] = prop_name;
  func->internal_function.reserved[1] = NULL;

  return func;
}

static zend_always_inline zend_function *zend_get_user_call_function(zend_class_entry *ce, zend_string *method_name) /* {{{ */
{
  return zend_get_call_trampoline_func(ce, method_name, 0);
}
/* }}} */

ZEND_API ZEND_COLD zend_never_inline void zend_bad_method_call(zend_function *fbc, zend_string *method_name, zend_class_entry *scope) /* {{{ */
{
  zend_throw_error(NULL, "Call to %s method %s::%s() from %s%s",
    zend_visibility_string(fbc->common.fn_flags), ZEND_FN_SCOPE_NAME(fbc), ZSTR_VAL(method_name),
    scope ? "scope " : "global scope",
    scope ? ZSTR_VAL(scope->name) : ""
  );
}
/* }}} */

ZEND_API ZEND_COLD zend_never_inline void zend_abstract_method_call(zend_function *fbc) /* {{{ */
{
  zend_throw_error(NULL, "Cannot call abstract method %s::%s()",
    ZSTR_VAL(fbc->common.scope->name), ZSTR_VAL(fbc->common.function_name));
}
/* }}} */

ZEND_API zend_function *zend_std_get_method(zend_object **obj_ptr, zend_string *method_name, const zval *key) /* {{{ */
{
  zend_object *zobj = *obj_ptr;
  zval *func;
  zend_function *fbc;
  zend_string *lc_method_name;
  zend_class_entry *scope;
  ALLOCA_FLAG(use_heap);

  if (EXPECTED(key != NULL)) {
    lc_method_name = Z_STR_P(key);
#ifdef ZEND_ALLOCA_MAX_SIZE
    use_heap = 0;
#endif
  } else {
    ZSTR_ALLOCA_ALLOC(lc_method_name, ZSTR_LEN(method_name), use_heap);
    zend_str_tolower_copy(ZSTR_VAL(lc_method_name), ZSTR_VAL(method_name), ZSTR_LEN(method_name));
  }

  if (UNEXPECTED((func = zend_hash_find(&zobj->ce->function_table, lc_method_name)) == NULL)) {
    if (UNEXPECTED(!key)) {
      ZSTR_ALLOCA_FREE(lc_method_name, use_heap);
    }
    if (zobj->ce->__call) {
      return zend_get_user_call_function(zobj->ce, method_name);
    } else {
      return NULL;
    }
  }

  fbc = Z_FUNC_P(func);

  /* Check access level */
  if (fbc->op_array.fn_flags & (ZEND_ACC_CHANGED|ZEND_ACC_PRIVATE|ZEND_ACC_PROTECTED)) {
    scope = zend_get_executed_scope();

    if (fbc->common.scope != scope) {
      if (fbc->op_array.fn_flags & ZEND_ACC_CHANGED) {
        zend_function *updated_fbc = zend_get_parent_private_method(scope, zobj->ce, lc_method_name);

        if (EXPECTED(updated_fbc != NULL)) {
          fbc = updated_fbc;
          goto exit;
        } else if (fbc->op_array.fn_flags & ZEND_ACC_PUBLIC) {
          goto exit;
        }
      }
      if (UNEXPECTED(fbc->op_array.fn_flags & ZEND_ACC_PRIVATE)
       || UNEXPECTED(!zend_check_protected(zend_get_function_root_class(fbc), scope))) {
        if (zobj->ce->__call) {
          fbc = zend_get_user_call_function(zobj->ce, method_name);
        } else {
          zend_bad_method_call(fbc, method_name, scope);
          fbc = NULL;
        }
      }
    }
  }

exit:
  if (fbc && UNEXPECTED(fbc->common.fn_flags & ZEND_ACC_ABSTRACT)) {
    zend_abstract_method_call(fbc);
    fbc = NULL;
  }
  if (UNEXPECTED(!key)) {
    ZSTR_ALLOCA_FREE(lc_method_name, use_heap);
  }
  return fbc;
}
/* }}} */

static zend_always_inline zend_function *zend_get_user_callstatic_function(zend_class_entry *ce, zend_string *method_name) /* {{{ */
{
  return zend_get_call_trampoline_func(ce, method_name, 1);
}
/* }}} */

static zend_always_inline zend_function *get_static_method_fallback(
    zend_class_entry *ce, zend_string *function_name)
{
  zend_object *object;
  if (ce->__call &&
    (object = zend_get_this_object(EG(current_execute_data))) != NULL &&
    instanceof_function(object->ce, ce)) {
    /* Call the top-level defined __call().
     * see: tests/classes/__call_004.phpt  */

    ZEND_ASSERT(object->ce->__call);
    return zend_get_user_call_function(object->ce, function_name);
  } else if (ce->__callstatic) {
    return zend_get_user_callstatic_function(ce, function_name);
  } else {
    return NULL;
  }
}

ZEND_API zend_function *zend_std_get_static_method(zend_class_entry *ce, zend_string *function_name, const zval *key) /* {{{ */
{
  zend_string *lc_function_name;
  if (EXPECTED(key != NULL)) {
    lc_function_name = Z_STR_P(key);
  } else {
    lc_function_name = zend_string_tolower(function_name);
  }

  zend_function *fbc;
  zval *func = zend_hash_find(&ce->function_table, lc_function_name);
  if (EXPECTED(func)) {
    fbc = Z_FUNC_P(func);
    if (!(fbc->op_array.fn_flags & ZEND_ACC_PUBLIC)) {
      zend_class_entry *scope = zend_get_executed_scope();
      if (UNEXPECTED(fbc->common.scope != scope)) {
        if (UNEXPECTED(fbc->op_array.fn_flags & ZEND_ACC_PRIVATE)
         || UNEXPECTED(!zend_check_protected(zend_get_function_root_class(fbc), scope))) {
          zend_function *fallback_fbc = get_static_method_fallback(ce, function_name);
          if (!fallback_fbc) {
            zend_bad_method_call(fbc, function_name, scope);
          }
          fbc = fallback_fbc;
        }
      }
    }
  } else {
    fbc = get_static_method_fallback(ce, function_name);
  }

  if (UNEXPECTED(!key)) {
    zend_string_release_ex(lc_function_name, 0);
  }

  if (EXPECTED(fbc)) {
    if (UNEXPECTED(fbc->common.fn_flags & ZEND_ACC_ABSTRACT)) {
      zend_abstract_method_call(fbc);
      goto fail;
    } else if (UNEXPECTED(fbc->common.scope->ce_flags & ZEND_ACC_TRAIT)) {
      zend_error(E_DEPRECATED,
        "Calling static trait method %s::%s is deprecated, "
        "it should only be called on a class using the trait",
        ZSTR_VAL(fbc->common.scope->name), ZSTR_VAL(fbc->common.function_name));
      if (EG(exception)) {
        goto fail;
      }
    }
  }

  return fbc;

 fail:
  if (UNEXPECTED(fbc->common.fn_flags & ZEND_ACC_CALL_VIA_TRAMPOLINE)) {
    zend_string_release_ex(fbc->common.function_name, 0);
    zend_free_trampoline(fbc);
  }

  return NULL;
}
/* }}} */

ZEND_API void zend_class_init_statics(zend_class_entry *class_type) /* {{{ */
{
  int i;
  zval *p;

  if (class_type->default_static_members_count && !CE_STATIC_MEMBERS(class_type)) {
    if (class_type->parent) {
      zend_class_init_statics(class_type->parent);
    }

    ZEND_MAP_PTR_SET(class_type->static_members_table, emalloc(sizeof(zval) * class_type->default_static_members_count));
    for (i = 0; i < class_type->default_static_members_count; i++) {
      p = &class_type->default_static_members_table[i];
      if (Z_TYPE_P(p) == IS_INDIRECT) {
        zval *q = &CE_STATIC_MEMBERS(class_type->parent)[i];
        ZVAL_DEINDIRECT(q);
        ZVAL_INDIRECT(&CE_STATIC_MEMBERS(class_type)[i], q);
      } else {
        ZVAL_COPY_OR_DUP(&CE_STATIC_MEMBERS(class_type)[i], p);
      }
    }
  }
} /* }}} */

ZEND_API zval *zend_std_get_static_property_with_info(zend_class_entry *ce, zend_string *property_name, int type, zend_property_info **property_info_ptr) /* {{{ */
{
  zval *ret;
  zend_property_info *property_info = zend_hash_find_ptr(&ce->properties_info, property_name);
  *property_info_ptr = property_info;

  if (UNEXPECTED(property_info == NULL)) {
    goto undeclared_property;
  }

  if (!(property_info->flags & ZEND_ACC_PUBLIC)) {
    zend_class_entry *scope = get_fake_or_executed_scope();
    if (property_info->ce != scope) {
      if (UNEXPECTED(property_info->flags & ZEND_ACC_PRIVATE)
       || UNEXPECTED(!is_protected_compatible_scope(property_info->ce, scope))) {
        if (type != BP_VAR_IS) {
          zend_bad_property_access(property_info, ce, property_name);
        }
        return NULL;
      }
    }
  }

  if (UNEXPECTED((property_info->flags & ZEND_ACC_STATIC) == 0)) {
undeclared_property:
    if (type != BP_VAR_IS) {
      zend_throw_error(NULL, "Access to undeclared static property %s::$%s", ZSTR_VAL(ce->name), ZSTR_VAL(property_name));
    }
    return NULL;
  }

  if (UNEXPECTED(!(ce->ce_flags & ZEND_ACC_CONSTANTS_UPDATED))) {
    if (UNEXPECTED(zend_update_class_constants(ce) != SUCCESS)) {
      return NULL;
    }
  }

  /* Ensure static properties are initialized. */
  if (UNEXPECTED(CE_STATIC_MEMBERS(ce) == NULL)) {
    zend_class_init_statics(ce);
  }

  ret = CE_STATIC_MEMBERS(ce) + property_info->offset;
  ZVAL_DEINDIRECT(ret);

  if (UNEXPECTED((type == BP_VAR_R || type == BP_VAR_RW)
        && Z_TYPE_P(ret) == IS_UNDEF && ZEND_TYPE_IS_SET(property_info->type))) {
    zend_throw_error(NULL, "Typed static property %s::$%s must not be accessed before initialization",
      ZSTR_VAL(property_info->ce->name), ZSTR_VAL(property_name));
    return NULL;
  }

  if (UNEXPECTED(ce->ce_flags & ZEND_ACC_TRAIT)) {
    zend_error(E_DEPRECATED,
      "Accessing static trait property %s::$%s is deprecated, "
      "it should only be accessed on a class using the trait",
      ZSTR_VAL(property_info->ce->name), ZSTR_VAL(property_name));
  }

  return ret;
}
/* }}} */

ZEND_API zval *zend_std_get_static_property(zend_class_entry *ce, zend_string *property_name, int type) /* {{{ */
{
  zend_property_info *prop_info;
  return zend_std_get_static_property_with_info(ce, property_name, type, &prop_info);
}

ZEND_API ZEND_COLD bool zend_std_unset_static_property(zend_class_entry *ce, zend_string *property_name) /* {{{ */
{
  zend_throw_error(NULL, "Attempt to unset static property %s::$%s", ZSTR_VAL(ce->name), ZSTR_VAL(property_name));
  return 0;
}
/* }}} */

static ZEND_COLD zend_never_inline void zend_bad_constructor_call(zend_function *constructor, zend_class_entry *scope) /* {{{ */
{
  if (scope) {
    zend_throw_error(NULL, "Call to %s %s::%s() from scope %s",
      zend_visibility_string(constructor->common.fn_flags), ZSTR_VAL(constructor->common.scope->name),
      ZSTR_VAL(constructor->common.function_name), ZSTR_VAL(scope->name)
    );
  } else {
    zend_throw_error(NULL, "Call to %s %s::%s() from global scope", zend_visibility_string(constructor->common.fn_flags), ZSTR_VAL(constructor->common.scope->name), ZSTR_VAL(constructor->common.function_name));
  }
}
/* }}} */

ZEND_API zend_function *zend_std_get_constructor(zend_object *zobj) /* {{{ */
{
  zend_function *constructor = zobj->ce->constructor;

  if (constructor) {
    if (UNEXPECTED(!(constructor->op_array.fn_flags & ZEND_ACC_PUBLIC))) {
      zend_class_entry *scope = get_fake_or_executed_scope();
      if (UNEXPECTED(constructor->common.scope != scope)) {
        if (UNEXPECTED(constructor->op_array.fn_flags & ZEND_ACC_PRIVATE)
         || UNEXPECTED(!zend_check_protected(zend_get_function_root_class(constructor), scope))) {
          zend_bad_constructor_call(constructor, scope);
          zend_object_store_ctor_failed(zobj);
          constructor = NULL;
        }
      }
    }
  }

  return constructor;
}
/* }}} */

ZEND_API int zend_std_compare_objects(zval *o1, zval *o2) /* {{{ */
{
  zend_object *zobj1, *zobj2;

  if (zend_objects_check_stack_limit()) {
    zend_throw_error(NULL, "Maximum call stack size reached during object comparison");
    return ZEND_UNCOMPARABLE;
  }

  if (Z_TYPE_P(o1) != Z_TYPE_P(o2)) {
    /* Object and non-object */
    zval *object;
    zval *value;
    zval casted;
    bool object_lhs;
    if (Z_TYPE_P(o1) == IS_OBJECT) {
      object = o1;
      value = o2;
      object_lhs = true;
    } else {
      object = o2;
      value = o1;
      object_lhs = false;
    }
    ZEND_ASSERT(Z_TYPE_P(value) != IS_OBJECT);
    uint8_t target_type = Z_TYPE_P(value);
    /* Should be handled in zend_compare(). */
    ZEND_ASSERT(target_type != IS_FALSE && target_type != IS_TRUE);
    if (Z_OBJ_HT_P(object)->cast_object(Z_OBJ_P(object), &casted, target_type) == FAILURE) {
      // TODO: Less crazy.
      if (target_type == IS_LONG || target_type == IS_DOUBLE) {
        zend_error(E_NOTICE, "Object of class %s could not be converted to %s",
               ZSTR_VAL(Z_OBJCE_P(object)->name), zend_get_type_by_const(target_type));
        if (target_type == IS_LONG) {
          ZVAL_LONG(&casted, 1);
        } else {
          ZVAL_DOUBLE(&casted, 1.0);
        }
      } else {
        return object_lhs ? 1 : -1;
      }
    }
    int ret = object_lhs ? zend_compare(&casted, value) : zend_compare(value, &casted);
    zval_ptr_dtor(&casted);
    return ret;
  }

  zobj1 = Z_OBJ_P(o1);
  zobj2 = Z_OBJ_P(o2);

  if (zobj1 == zobj2) {
    return 0; /* the same object */
  }
  if (zobj1->ce != zobj2->ce) {
    return ZEND_UNCOMPARABLE; /* different classes */
  }
  if (!zobj1->properties && !zobj2->properties
      && !zend_object_is_lazy(zobj1) && !zend_object_is_lazy(zobj2)) {
    zend_property_info *info;
    int i;

    if (!zobj1->ce->default_properties_count) {
      return 0;
    }

    /* It's enough to protect only one of the objects.
     * The second one may be referenced from the first and this may cause
     * false recursion detection.
     */
    /* use bitwise OR to make only one conditional jump */
    if (UNEXPECTED(Z_IS_RECURSIVE_P(o1))) {
      zend_throw_error(NULL, "Nesting level too deep - recursive dependency?");
      return ZEND_UNCOMPARABLE;
    }
    Z_PROTECT_RECURSION_P(o1);

    for (i = 0; i < zobj1->ce->default_properties_count; i++) {
      zval *p1, *p2;

      info = zobj1->ce->properties_info_table[i];

      if (!info) {
        continue;
      }

      p1 = OBJ_PROP(zobj1, info->offset);
      p2 = OBJ_PROP(zobj2, info->offset);

      if (Z_TYPE_P(p1) != IS_UNDEF) {
        if (Z_TYPE_P(p2) != IS_UNDEF) {
          int ret;

          ret = zend_compare(p1, p2);
          if (ret != 0) {
            Z_UNPROTECT_RECURSION_P(o1);
            return ret;
          }
        } else {
          Z_UNPROTECT_RECURSION_P(o1);
          return 1;
        }
      } else {
        if (Z_TYPE_P(p2) != IS_UNDEF) {
          Z_UNPROTECT_RECURSION_P(o1);
          return 1;
        }
      }
    }

    Z_UNPROTECT_RECURSION_P(o1);
    return 0;
  } else {
    return zend_compare_symbol_tables(
        zend_std_get_properties_ex(zobj1),
        zend_std_get_properties_ex(zobj2));
  }
}
/* }}} */

ZEND_API int zend_objects_not_comparable(zval *o1, zval *o2)
{
  return ZEND_UNCOMPARABLE;
}

// todo: make zend_std_has_property return bool as well
ZEND_API int zend_std_has_property(zend_object *zobj, zend_string *name, int has_set_exists, void **cache_slot) /* {{{ */
{
  bool result;
  zval *value = NULL;
  uintptr_t property_offset;
  const zend_property_info *prop_info = NULL;

  property_offset = zend_get_property_offset(zobj->ce, name, 1, cache_slot, &prop_info);

  if (EXPECTED(IS_VALID_PROPERTY_OFFSET(property_offset))) {
try_again:
    value = OBJ_PROP(zobj, property_offset);
    if (Z_TYPE_P(value) != IS_UNDEF) {
      goto found;
    }
    if (UNEXPECTED(Z_PROP_FLAG_P(value) & IS_PROP_UNINIT)) {
      /* Skip __isset() for uninitialized typed properties */
      goto lazy_init;
    }
  } else if (EXPECTED(IS_DYNAMIC_PROPERTY_OFFSET(property_offset))) {
    if (EXPECTED(zobj->properties != NULL)) {
      if (!IS_UNKNOWN_DYNAMIC_PROPERTY_OFFSET(property_offset)) {
        uintptr_t idx = ZEND_DECODE_DYN_PROP_OFFSET(property_offset);

        if (EXPECTED(idx < zobj->properties->nNumUsed * sizeof(Bucket))) {
          Bucket *p = (Bucket*)((char*)zobj->properties->arData + idx);

          if (EXPECTED(p->key == name) ||
                (EXPECTED(p->h == ZSTR_H(name)) &&
                 EXPECTED(p->key != NULL) &&
                 EXPECTED(zend_string_equal_content(p->key, name)))) {
            value = &p->val;
            goto found;
          }
        }
        CACHE_PTR_EX(cache_slot + 1, (void*)ZEND_DYNAMIC_PROPERTY_OFFSET);
      }
      value = zend_hash_find(zobj->properties, name);
      if (value) {
        if (cache_slot) {
          uintptr_t idx = (char*)value - (char*)zobj->properties->arData;
          CACHE_PTR_EX(cache_slot + 1, (void*)ZEND_ENCODE_DYN_PROP_OFFSET(idx));
        }
found:
        if (has_set_exists == ZEND_PROPERTY_NOT_EMPTY) {
          result = zend_is_true(value);
        } else if (has_set_exists < ZEND_PROPERTY_NOT_EMPTY) {
          ZEND_ASSERT(has_set_exists == ZEND_PROPERTY_ISSET);
          ZVAL_DEREF(value);
          result = (Z_TYPE_P(value) != IS_NULL);
        } else {
          ZEND_ASSERT(has_set_exists == ZEND_PROPERTY_EXISTS);
          result = true;
        }
        goto exit;
      }
    }
  } else if (IS_HOOKED_PROPERTY_OFFSET(property_offset)) {
    zend_function *get = prop_info->hooks[ZEND_PROPERTY_HOOK_GET];

    if (has_set_exists == ZEND_PROPERTY_EXISTS) {
      if (prop_info->flags & ZEND_ACC_VIRTUAL) {
        return true;
      }
      property_offset = prop_info->offset;
      goto try_again;
    }

    if (!get) {
      if (prop_info->flags & ZEND_ACC_VIRTUAL) {
        zend_throw_error(NULL, "Property %s::$%s is write-only",
          ZSTR_VAL(zobj->ce->name), ZSTR_VAL(name));
        return 0;
      } else {
        property_offset = prop_info->offset;
        goto try_again;
      }
    }

    zval rv;
    if (!zend_call_get_hook(prop_info, name, get, zobj, &rv)) {
      if (EG(exception)) {
        return 0;
      }
      property_offset = prop_info->offset;
      goto try_again;
    }

    if (has_set_exists == ZEND_PROPERTY_NOT_EMPTY) {
      result = zend_is_true(&rv);
    } else {
      ZEND_ASSERT(has_set_exists == ZEND_PROPERTY_ISSET);
      result = Z_TYPE(rv) != IS_NULL
        && (Z_TYPE(rv) != IS_REFERENCE || Z_TYPE_P(Z_REFVAL(rv)) != IS_NULL);
    }
    zval_ptr_dtor(&rv);
    return result;
  } else if (UNEXPECTED(EG(exception))) {
    result = false;
    goto exit;
  }

  if (!zobj->ce->__isset) {
    goto lazy_init;
  }

  result = false;
  if (has_set_exists != ZEND_PROPERTY_EXISTS) {
    uint32_t *guard = zend_get_property_guard(zobj, name);

    if (!((*guard) & IN_ISSET)) {
      zval rv;

      /* have issetter - try with it! */
      GC_ADDREF(zobj);
      (*guard) |= IN_ISSET; /* prevent circular getting */
      zend_std_call_issetter(zobj, name, &rv);
      result = zend_is_true(&rv);
      zval_ptr_dtor(&rv);
      if (has_set_exists == ZEND_PROPERTY_NOT_EMPTY && result) {
        if (EXPECTED(!EG(exception)) && zobj->ce->__get && !((*guard) & IN_GET)) {
          (*guard) |= IN_GET;
          zend_std_call_getter(zobj, name, &rv);
          (*guard) &= ~IN_GET;
          result = i_zend_is_true(&rv);
          zval_ptr_dtor(&rv);
        } else {
          result = false;
        }
      }
      (*guard) &= ~IN_ISSET;
      OBJ_RELEASE(zobj);
    } else {
      goto lazy_init;
    }
  }

exit:
  return result;

lazy_init:
  if (UNEXPECTED(zend_lazy_object_must_init(zobj))) {
    if (!value || (Z_PROP_FLAG_P(value) & IS_PROP_LAZY)) {
      zobj = zend_lazy_object_init(zobj);
      if (!zobj) {
        result = 0;
        goto exit;
      }

      if (UNEXPECTED(zobj->ce->__isset)) {
        uint32_t *guard = zend_get_property_guard(zobj, name);
        if (!((*guard) & IN_ISSET)) {
          (*guard) |= IN_ISSET;
          result = zend_std_has_property(zobj, name, has_set_exists, cache_slot);
          (*guard) &= ~IN_ISSET;
          return result;
        }
      }

      return zend_std_has_property(zobj, name, has_set_exists, cache_slot);
    }
  }

  result = 0;
  goto exit;
}
/* }}} */

ZEND_API zend_string *zend_std_get_class_name(const zend_object *zobj) /* {{{ */
{
  return zend_string_copy(zobj->ce->name);
}
/* }}} */

ZEND_API zend_result zend_std_cast_object_tostring(zend_object *readobj, zval *writeobj, int type) /* {{{ */
{
  switch (type) {
    case IS_STRING: {
      zend_class_entry *ce = readobj->ce;
      if (ce->__tostring) {
        zval retval;
        GC_ADDREF(readobj);
        zend_call_known_instance_method_with_0_params(ce->__tostring, readobj, &retval);
        zend_object_release(readobj);
        if (EXPECTED(Z_TYPE(retval) == IS_STRING)) {
is_string:
          ZVAL_COPY_VALUE(writeobj, &retval);
          return SUCCESS;
        } else if (Z_ISREF(retval)) {
          zend_unwrap_reference(&retval);
          goto is_string;
        }
        zval_ptr_dtor(&retval);
        if (!EG(exception)) {
          zend_throw_error(NULL, "Method %s::__toString() must return a string value", ZSTR_VAL(ce->name));
        }
      }
      return FAILURE;
    }
    case _IS_BOOL:
      ZVAL_TRUE(writeobj);
      return SUCCESS;
    default:
      return FAILURE;
  }
}
/* }}} */

ZEND_API zend_result zend_std_get_closure(zend_object *obj, zend_class_entry **ce_ptr, zend_function **fptr_ptr, zend_object **obj_ptr, bool check_only) /* {{{ */
{
  zend_class_entry *ce = obj->ce;
  zval *func = zend_hash_find_known_hash(&ce->function_table, ZSTR_KNOWN(ZEND_STR_MAGIC_INVOKE));

  if (func == NULL) {
    return FAILURE;
  }
  *fptr_ptr = Z_FUNC_P(func);
  *ce_ptr = ce;
  *obj_ptr = obj;

  return SUCCESS;
}
/* }}} */

ZEND_API HashTable *zend_std_get_properties_for(zend_object *obj, zend_prop_purpose purpose) {
  HashTable *ht;
  switch (purpose) {
    case ZEND_PROP_PURPOSE_DEBUG:
      if (obj->handlers->get_debug_info) {
        int is_temp;
        ht = obj->handlers->get_debug_info(obj, &is_temp);
        if (ht && !is_temp) {
          GC_TRY_ADDREF(ht);
        }
        return ht;
      }
      ZEND_FALLTHROUGH;
    case ZEND_PROP_PURPOSE_JSON:
    case ZEND_PROP_PURPOSE_GET_OBJECT_VARS:
    case ZEND_PROP_PURPOSE_VAR_EXPORT:
      if (obj->ce->num_hooked_props) {
        return zend_hooked_object_build_properties(obj);
      }
      ht = obj->handlers->get_properties(obj);
      if (ht) {
        GC_TRY_ADDREF(ht);
      }
      return ht;
    case ZEND_PROP_PURPOSE_ARRAY_CAST:
      ht = zend_get_properties_no_lazy_init(obj);
      if (ht) {
        GC_TRY_ADDREF(ht);
      }
      return ht;
    case ZEND_PROP_PURPOSE_SERIALIZE: {
      if (zend_object_is_lazy(obj)
          && !zend_lazy_object_initialize_on_serialize(obj)) {
        ht = zend_get_properties_no_lazy_init(obj);
      } else {
        ht = obj->handlers->get_properties(obj);
      }
      if (ht) {
        GC_TRY_ADDREF(ht);
      }
      return ht;
    }
    default:
      ZEND_UNREACHABLE();
      return NULL;
  }
}

ZEND_API HashTable *zend_get_properties_for(zval *obj, zend_prop_purpose purpose) {
  zend_object *zobj = Z_OBJ_P(obj);

  if (zobj->handlers->get_properties_for) {
    return zobj->handlers->get_properties_for(zobj, purpose);
  }

  return zend_std_get_properties_for(zobj, purpose);
}

ZEND_API const zend_object_handlers std_object_handlers = {
  0,                    /* offset */

  zend_object_std_dtor,         /* free_obj */
  zend_objects_destroy_object,      /* dtor_obj */
  zend_objects_clone_obj,         /* clone_obj */

  zend_std_read_property,         /* read_property */
  zend_std_write_property,        /* write_property */
  zend_std_read_dimension,        /* read_dimension */
  zend_std_write_dimension,       /* write_dimension */
  zend_std_get_property_ptr_ptr,      /* get_property_ptr_ptr */
  zend_std_has_property,          /* has_property */
  zend_std_unset_property,        /* unset_property */
  zend_std_has_dimension,         /* has_dimension */
  zend_std_unset_dimension,       /* unset_dimension */
  zend_std_get_properties,        /* get_properties */
  zend_std_get_method,          /* get_method */
  zend_std_get_constructor,       /* get_constructor */
  zend_std_get_class_name,        /* get_class_name */
  zend_std_cast_object_tostring,      /* cast_object */
  NULL,                 /* count_elements */
  zend_std_get_debug_info,        /* get_debug_info */
  zend_std_get_closure,         /* get_closure */
  zend_std_get_gc,            /* get_gc */
  NULL,                 /* do_operation */
  zend_std_compare_objects,       /* compare */
  NULL,                 /* get_properties_for */
};

Coverage Report

Created: 2025-06-13 06:43