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ladybird/Userland/Libraries/LibJS/Runtime/Object.cpp
Linus Groh 275da6fcc9 LibJS: Update Object::define_accessor() to take both getter and setter 
This replaces the current 'function plus boolean indicating the type'
API, which makes it easier to set both getter and setter at once.
This was already possible before but required two calls of this
function, which wasn't intuitive:

    define_accessor(name, getter, true, ...);
    define_accessor(name, setter, false, ...);

Which now becomes:

    define_accessor(name, getter, setter, ...);
2021-04-10 21:00:04 +02:00

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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020-2021, Linus Groh <mail@linusgroh.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Debug.h>
#include <AK/String.h>
#include <AK/TemporaryChange.h>
#include <LibJS/Heap/Heap.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Accessor.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/NativeFunction.h>
#include <LibJS/Runtime/NativeProperty.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/Shape.h>
#include <LibJS/Runtime/StringObject.h>
#include <LibJS/Runtime/Value.h>
namespace JS {
PropertyDescriptor PropertyDescriptor::from_dictionary(VM& vm, const Object& object)
{
PropertyAttributes attributes;
if (object.has_property(vm.names.configurable)) {
attributes.set_has_configurable();
if (object.get(vm.names.configurable).value_or(Value(false)).to_boolean())
attributes.set_configurable();
if (vm.exception())
return {};
}
if (object.has_property(vm.names.enumerable)) {
attributes.set_has_enumerable();
if (object.get(vm.names.enumerable).value_or(Value(false)).to_boolean())
attributes.set_enumerable();
if (vm.exception())
return {};
}
if (object.has_property(vm.names.writable)) {
attributes.set_has_writable();
if (object.get(vm.names.writable).value_or(Value(false)).to_boolean())
attributes.set_writable();
if (vm.exception())
return {};
}
PropertyDescriptor descriptor { attributes, object.get(vm.names.value), nullptr, nullptr };
if (vm.exception())
return {};
auto getter = object.get(vm.names.get);
if (vm.exception())
return {};
if (getter.is_function())
descriptor.getter = &getter.as_function();
auto setter = object.get(vm.names.set);
if (vm.exception())
return {};
if (setter.is_function())
descriptor.setter = &setter.as_function();
return descriptor;
}
Object* Object::create_empty(GlobalObject& global_object)
{
return global_object.heap().allocate<Object>(global_object, *global_object.new_object_shape());
}
Object::Object(GlobalObjectTag)
{
// This is the global object
m_shape = heap().allocate_without_global_object<Shape>(*this);
}
Object::Object(ConstructWithoutPrototypeTag, GlobalObject& global_object)
{
m_shape = heap().allocate_without_global_object<Shape>(global_object);
}
Object::Object(Object& prototype)
{
m_shape = prototype.global_object().empty_object_shape();
set_prototype(&prototype);
}
Object::Object(Shape& shape)
: m_shape(&shape)
{
m_storage.resize(shape.property_count());
}
void Object::initialize(GlobalObject&)
{
}
Object::~Object()
{
}
Object* Object::prototype()
{
return shape().prototype();
}
const Object* Object::prototype() const
{
return shape().prototype();
}
bool Object::set_prototype(Object* new_prototype)
{
if (prototype() == new_prototype)
return true;
if (!m_is_extensible)
return false;
if (shape().is_unique()) {
shape().set_prototype_without_transition(new_prototype);
return true;
}
m_shape = m_shape->create_prototype_transition(new_prototype);
return true;
}
bool Object::has_prototype(const Object* prototype) const
{
for (auto* object = this->prototype(); object; object = object->prototype()) {
if (vm().exception())
return false;
if (object == prototype)
return true;
}
return false;
}
bool Object::prevent_extensions()
{
m_is_extensible = false;
return true;
}
// 7.3.15 SetIntegrityLevel, https://tc39.es/ecma262/#sec-setintegritylevel
bool Object::set_integrity_level(IntegrityLevel level)
{
// FIXME: This feels clunky and should get nicer abstractions.
auto update_property = [this](auto& key, auto attributes) {
auto property_name = PropertyName::from_value(global_object(), key);
auto metadata = shape().lookup(property_name.to_string_or_symbol());
VERIFY(metadata.has_value());
auto value = get_direct(metadata->offset);
define_property(property_name, value, metadata->attributes.bits() & attributes);
};
auto& vm = this->vm();
auto status = prevent_extensions();
if (vm.exception())
return false;
if (!status)
return false;
auto keys = get_own_properties(PropertyKind::Key);
if (vm.exception())
return false;
switch (level) {
case IntegrityLevel::Sealed:
for (auto& key : keys) {
update_property(key, ~Attribute::Configurable);
if (vm.exception())
return {};
}
break;
case IntegrityLevel::Frozen:
for (auto& key : keys) {
auto property_name = PropertyName::from_value(global_object(), key);
auto property_descriptor = get_own_property_descriptor(property_name);
VERIFY(property_descriptor.has_value());
u8 attributes = property_descriptor->is_accessor_descriptor()
? ~Attribute::Configurable
: ~Attribute::Configurable & ~Attribute::Writable;
update_property(key, attributes);
if (vm.exception())
return {};
}
break;
default:
VERIFY_NOT_REACHED();
}
return true;
}
// 7.3.16 TestIntegrityLevel, https://tc39.es/ecma262/#sec-testintegritylevel
bool Object::test_integrity_level(IntegrityLevel level)
{
auto& vm = this->vm();
auto extensible = is_extensible();
if (vm.exception())
return false;
if (extensible)
return false;
auto keys = get_own_properties(PropertyKind::Key);
if (vm.exception())
return false;
for (auto& key : keys) {
auto property_name = PropertyName::from_value(global_object(), key);
auto property_descriptor = get_own_property_descriptor(property_name);
VERIFY(property_descriptor.has_value());
if (property_descriptor->attributes.is_configurable())
return false;
if (level == IntegrityLevel::Frozen && property_descriptor->is_data_descriptor()) {
if (property_descriptor->attributes.is_writable())
return false;
}
}
return true;
}
Value Object::get_own_property(const PropertyName& property_name, Value receiver) const
{
VERIFY(property_name.is_valid());
VERIFY(!receiver.is_empty());
Value value_here;
if (property_name.is_number()) {
auto existing_property = m_indexed_properties.get(nullptr, property_name.as_number(), false);
if (!existing_property.has_value())
return {};
value_here = existing_property.value().value.value_or(js_undefined());
} else {
auto metadata = shape().lookup(property_name.to_string_or_symbol());
if (!metadata.has_value())
return {};
value_here = m_storage[metadata.value().offset].value_or(js_undefined());
}
VERIFY(!value_here.is_empty());
if (value_here.is_accessor())
return value_here.as_accessor().call_getter(receiver);
if (value_here.is_native_property())
return call_native_property_getter(value_here.as_native_property(), receiver);
return value_here;
}
MarkedValueList Object::get_own_properties(PropertyKind kind, bool only_enumerable_properties, GetOwnPropertyReturnType return_type) const
{
MarkedValueList properties(heap());
// FIXME: Support generic iterables
if (is<StringObject>(*this)) {
auto str = static_cast<const StringObject&>(*this).primitive_string().string();
for (size_t i = 0; i < str.length(); ++i) {
if (kind == PropertyKind::Key) {
properties.append(js_string(vm(), String::number(i)));
} else if (kind == PropertyKind::Value) {
properties.append(js_string(vm(), String::formatted("{:c}", str[i])));
} else {
auto* entry_array = Array::create(global_object());
entry_array->define_property(0, js_string(vm(), String::number(i)));
entry_array->define_property(1, js_string(vm(), String::formatted("{:c}", str[i])));
properties.append(entry_array);
}
if (vm().exception())
return MarkedValueList { heap() };
}
return properties;
}
for (auto& entry : m_indexed_properties) {
auto value_and_attributes = entry.value_and_attributes(const_cast<Object*>(this));
if (only_enumerable_properties && !value_and_attributes.attributes.is_enumerable())
continue;
if (kind == PropertyKind::Key) {
properties.append(js_string(vm(), String::number(entry.index())));
} else if (kind == PropertyKind::Value) {
properties.append(value_and_attributes.value);
} else {
auto* entry_array = Array::create(global_object());
entry_array->define_property(0, js_string(vm(), String::number(entry.index())));
entry_array->define_property(1, value_and_attributes.value);
properties.append(entry_array);
}
if (vm().exception())
return MarkedValueList { heap() };
}
auto add_property_to_results = [&](auto& property) {
if (kind == PropertyKind::Key) {
properties.append(property.key.to_value(vm()));
} else if (kind == PropertyKind::Value) {
properties.append(get(property.key));
} else {
auto* entry_array = Array::create(global_object());
entry_array->define_property(0, property.key.to_value(vm()));
entry_array->define_property(1, get(property.key));
properties.append(entry_array);
}
};
// NOTE: Most things including for..in/of and Object.{keys,values,entries}() use StringOnly, and in those
// cases we won't be iterating the ordered property table twice. We can certainly improve this though.
if (return_type == GetOwnPropertyReturnType::All || return_type == GetOwnPropertyReturnType::StringOnly) {
for (auto& it : shape().property_table_ordered()) {
if (only_enumerable_properties && !it.value.attributes.is_enumerable())
continue;
if (it.key.is_symbol())
continue;
add_property_to_results(it);
if (vm().exception())
return MarkedValueList { heap() };
}
}
if (return_type == GetOwnPropertyReturnType::All || return_type == GetOwnPropertyReturnType::SymbolOnly) {
for (auto& it : shape().property_table_ordered()) {
if (only_enumerable_properties && !it.value.attributes.is_enumerable())
continue;
if (it.key.is_string())
continue;
add_property_to_results(it);
if (vm().exception())
return MarkedValueList { heap() };
}
}
return properties;
}
// 7.3.23 EnumerableOwnPropertyNames, https://tc39.es/ecma262/#sec-enumerableownpropertynames
MarkedValueList Object::get_enumerable_own_property_names(PropertyKind kind) const
{
return get_own_properties(kind, true, Object::GetOwnPropertyReturnType::StringOnly);
}
Optional<PropertyDescriptor> Object::get_own_property_descriptor(const PropertyName& property_name) const
{
VERIFY(property_name.is_valid());
Value value;
PropertyAttributes attributes;
if (property_name.is_number()) {
auto existing_value = m_indexed_properties.get(nullptr, property_name.as_number(), false);
if (!existing_value.has_value())
return {};
value = existing_value.value().value;
attributes = existing_value.value().attributes;
attributes = default_attributes;
} else {
auto metadata = shape().lookup(property_name.to_string_or_symbol());
if (!metadata.has_value())
return {};
value = m_storage[metadata.value().offset];
attributes = metadata.value().attributes;
}
PropertyDescriptor descriptor { attributes, {}, nullptr, nullptr };
if (value.is_native_property()) {
auto result = call_native_property_getter(value.as_native_property(), const_cast<Object*>(this));
descriptor.value = result.value_or(js_undefined());
} else if (value.is_accessor()) {
auto& pair = value.as_accessor();
if (pair.getter())
descriptor.getter = pair.getter();
if (pair.setter())
descriptor.setter = pair.setter();
} else {
descriptor.value = value.value_or(js_undefined());
}
return descriptor;
}
Value Object::get_own_property_descriptor_object(const PropertyName& property_name) const
{
VERIFY(property_name.is_valid());
auto& vm = this->vm();
auto descriptor_opt = get_own_property_descriptor(property_name);
if (!descriptor_opt.has_value())
return js_undefined();
auto descriptor = descriptor_opt.value();
auto* descriptor_object = Object::create_empty(global_object());
descriptor_object->define_property(vm.names.enumerable, Value(descriptor.attributes.is_enumerable()));
if (vm.exception())
return {};
descriptor_object->define_property(vm.names.configurable, Value(descriptor.attributes.is_configurable()));
if (vm.exception())
return {};
if (descriptor.is_data_descriptor()) {
descriptor_object->define_property(vm.names.value, descriptor.value.value_or(js_undefined()));
if (vm.exception())
return {};
descriptor_object->define_property(vm.names.writable, Value(descriptor.attributes.is_writable()));
if (vm.exception())
return {};
} else if (descriptor.is_accessor_descriptor()) {
if (descriptor.getter) {
descriptor_object->define_property(vm.names.get, Value(descriptor.getter));
if (vm.exception())
return {};
}
if (descriptor.setter) {
descriptor_object->define_property(vm.names.set, Value(descriptor.setter));
if (vm.exception())
return {};
}
}
return descriptor_object;
}
void Object::set_shape(Shape& new_shape)
{
m_storage.resize(new_shape.property_count());
m_shape = &new_shape;
}
bool Object::define_property(const StringOrSymbol& property_name, const Object& descriptor, bool throw_exceptions)
{
auto& vm = this->vm();
bool is_accessor_property = descriptor.has_property(vm.names.get) || descriptor.has_property(vm.names.set);
PropertyAttributes attributes;
if (descriptor.has_property(vm.names.configurable)) {
attributes.set_has_configurable();
if (descriptor.get(vm.names.configurable).value_or(Value(false)).to_boolean())
attributes.set_configurable();
if (vm.exception())
return false;
}
if (descriptor.has_property(vm.names.enumerable)) {
attributes.set_has_enumerable();
if (descriptor.get(vm.names.enumerable).value_or(Value(false)).to_boolean())
attributes.set_enumerable();
if (vm.exception())
return false;
}
if (is_accessor_property) {
if (descriptor.has_property(vm.names.value) || descriptor.has_property(vm.names.writable)) {
if (throw_exceptions)
vm.throw_exception<TypeError>(global_object(), ErrorType::AccessorValueOrWritable);
return false;
}
auto getter = descriptor.get(vm.names.get).value_or(js_undefined());
if (vm.exception())
return {};
auto setter = descriptor.get(vm.names.set).value_or(js_undefined());
if (vm.exception())
return {};
Function* getter_function { nullptr };
Function* setter_function { nullptr };
if (getter.is_function()) {
getter_function = &getter.as_function();
} else if (!getter.is_undefined()) {
vm.throw_exception<TypeError>(global_object(), ErrorType::AccessorBadField, "get");
return false;
}
if (setter.is_function()) {
setter_function = &setter.as_function();
} else if (!setter.is_undefined()) {
vm.throw_exception<TypeError>(global_object(), ErrorType::AccessorBadField, "set");
return false;
}
#if OBJECT_DEBUG
dbgln("Defining new property {} with accessor descriptor {{ attributes={}, getter={}, setter={} }}", property_name.to_display_string(), attributes, getter, setter);
#endif
return define_property(property_name, Accessor::create(vm, getter_function, setter_function), attributes, throw_exceptions);
}
auto value = descriptor.get(vm.names.value);
if (vm.exception())
return {};
if (descriptor.has_property(vm.names.writable)) {
attributes.set_has_writable();
if (descriptor.get(vm.names.writable).value_or(Value(false)).to_boolean())
attributes.set_writable();
if (vm.exception())
return false;
}
if (vm.exception())
return {};
#if OBJECT_DEBUG
dbgln("Defining new property {} with data descriptor {{ attributes={}, value={} }}", property_name.to_display_string(), attributes, value);
#endif
return define_property(property_name, value, attributes, throw_exceptions);
}
bool Object::define_property_without_transition(const PropertyName& property_name, Value value, PropertyAttributes attributes, bool throw_exceptions)
{
TemporaryChange change(m_transitions_enabled, false);
return define_property(property_name, value, attributes, throw_exceptions);
}
bool Object::define_property(const PropertyName& property_name, Value value, PropertyAttributes attributes, bool throw_exceptions)
{
VERIFY(property_name.is_valid());
if (property_name.is_number())
return put_own_property_by_index(property_name.as_number(), value, attributes, PutOwnPropertyMode::DefineProperty, throw_exceptions);
if (property_name.is_string()) {
i32 property_index = property_name.as_string().to_int().value_or(-1);
if (property_index >= 0)
return put_own_property_by_index(property_index, value, attributes, PutOwnPropertyMode::DefineProperty, throw_exceptions);
}
return put_own_property(property_name.to_string_or_symbol(), value, attributes, PutOwnPropertyMode::DefineProperty, throw_exceptions);
}
bool Object::define_accessor(const PropertyName& property_name, Function* getter, Function* setter, PropertyAttributes attributes, bool throw_exceptions)
{
VERIFY(property_name.is_valid());
Accessor* accessor { nullptr };
auto property_metadata = shape().lookup(property_name.to_string_or_symbol());
if (property_metadata.has_value()) {
auto existing_property = get_direct(property_metadata.value().offset);
if (existing_property.is_accessor())
accessor = &existing_property.as_accessor();
}
if (!accessor) {
accessor = Accessor::create(vm(), getter, setter);
bool definition_success = define_property(property_name, accessor, attributes, throw_exceptions);
if (vm().exception())
return {};
if (!definition_success)
return false;
} else {
if (getter)
accessor->set_getter(getter);
if (setter)
accessor->set_setter(setter);
}
return true;
}
bool Object::put_own_property(const StringOrSymbol& property_name, Value value, PropertyAttributes attributes, PutOwnPropertyMode mode, bool throw_exceptions)
{
VERIFY(!(mode == PutOwnPropertyMode::Put && value.is_accessor()));
if (value.is_accessor()) {
auto& accessor = value.as_accessor();
if (accessor.getter())
attributes.set_has_getter();
if (accessor.setter())
attributes.set_has_setter();
}
// NOTE: We disable transitions during initialize(), this makes building common runtime objects significantly faster.
// Transitions are primarily interesting when scripts add properties to objects.
if (!m_transitions_enabled && !m_shape->is_unique()) {
m_shape->add_property_without_transition(property_name, attributes);
m_storage.resize(m_shape->property_count());
m_storage[m_shape->property_count() - 1] = value;
return true;
}
auto metadata = shape().lookup(property_name);
bool new_property = !metadata.has_value();
if (!is_extensible() && new_property) {
#if OBJECT_DEBUG
dbgln("Disallow define_property of non-extensible object");
#endif
if (throw_exceptions && vm().in_strict_mode())
vm().throw_exception<TypeError>(global_object(), ErrorType::NonExtensibleDefine, property_name.to_display_string());
return false;
}
if (new_property) {
if (!m_shape->is_unique() && shape().property_count() > 100) {
// If you add more than 100 properties to an object, let's stop doing
// transitions to avoid filling up the heap with shapes.
ensure_shape_is_unique();
}
if (m_shape->is_unique()) {
m_shape->add_property_to_unique_shape(property_name, attributes);
m_storage.resize(m_shape->property_count());
} else if (m_transitions_enabled) {
set_shape(*m_shape->create_put_transition(property_name, attributes));
} else {
m_shape->add_property_without_transition(property_name, attributes);
m_storage.resize(m_shape->property_count());
}
metadata = shape().lookup(property_name);
VERIFY(metadata.has_value());
}
if (!new_property && mode == PutOwnPropertyMode::DefineProperty && !metadata.value().attributes.is_configurable() && attributes != metadata.value().attributes) {
#if OBJECT_DEBUG
dbgln("Disallow reconfig of non-configurable property");
#endif
if (throw_exceptions)
vm().throw_exception<TypeError>(global_object(), ErrorType::DescChangeNonConfigurable, property_name.to_display_string());
return false;
}
if (mode == PutOwnPropertyMode::DefineProperty && attributes != metadata.value().attributes) {
if (m_shape->is_unique()) {
m_shape->reconfigure_property_in_unique_shape(property_name, attributes);
} else {
set_shape(*m_shape->create_configure_transition(property_name, attributes));
}
metadata = shape().lookup(property_name);
#if OBJECT_DEBUG
dbgln("Reconfigured property {}, new shape says offset is {} and my storage capacity is {}", property_name.to_display_string(), metadata.value().offset, m_storage.size());
#endif
}
auto value_here = m_storage[metadata.value().offset];
if (!new_property && mode == PutOwnPropertyMode::Put && !value_here.is_accessor() && !metadata.value().attributes.is_writable()) {
#if OBJECT_DEBUG
dbgln("Disallow write to non-writable property");
#endif
return false;
}
if (value.is_empty())
return true;
if (value_here.is_native_property()) {
call_native_property_setter(value_here.as_native_property(), this, value);
} else {
m_storage[metadata.value().offset] = value;
}
return true;
}
bool Object::put_own_property_by_index(u32 property_index, Value value, PropertyAttributes attributes, PutOwnPropertyMode mode, bool throw_exceptions)
{
VERIFY(!(mode == PutOwnPropertyMode::Put && value.is_accessor()));
auto existing_property = m_indexed_properties.get(nullptr, property_index, false);
auto new_property = !existing_property.has_value();
if (!is_extensible() && new_property) {
#if OBJECT_DEBUG
dbgln("Disallow define_property of non-extensible object");
#endif
if (throw_exceptions && vm().in_strict_mode())
vm().throw_exception<TypeError>(global_object(), ErrorType::NonExtensibleDefine, property_index);
return false;
}
if (value.is_accessor()) {
auto& accessor = value.as_accessor();
if (accessor.getter())
attributes.set_has_getter();
if (accessor.setter())
attributes.set_has_setter();
}
PropertyAttributes existing_attributes = new_property ? 0 : existing_property.value().attributes;
if (!new_property && mode == PutOwnPropertyMode::DefineProperty && !existing_attributes.is_configurable() && attributes != existing_attributes) {
#if OBJECT_DEBUG
dbgln("Disallow reconfig of non-configurable property");
#endif
if (throw_exceptions)
vm().throw_exception<TypeError>(global_object(), ErrorType::DescChangeNonConfigurable, property_index);
return false;
}
auto value_here = new_property ? Value() : existing_property.value().value;
if (!new_property && mode == PutOwnPropertyMode::Put && !value_here.is_accessor() && !existing_attributes.is_writable()) {
#if OBJECT_DEBUG
dbgln("Disallow write to non-writable property");
#endif
return false;
}
if (value.is_empty())
return true;
if (value_here.is_native_property()) {
call_native_property_setter(value_here.as_native_property(), this, value);
} else {
m_indexed_properties.put(this, property_index, value, attributes, mode == PutOwnPropertyMode::Put);
}
return true;
}
bool Object::delete_property(const PropertyName& property_name)
{
VERIFY(property_name.is_valid());
if (property_name.is_number())
return m_indexed_properties.remove(property_name.as_number());
if (property_name.is_string()) {
i32 property_index = property_name.as_string().to_int().value_or(-1);
if (property_index >= 0)
return m_indexed_properties.remove(property_index);
}
auto metadata = shape().lookup(property_name.to_string_or_symbol());
if (!metadata.has_value())
return true;
if (!metadata.value().attributes.is_configurable())
return false;
size_t deleted_offset = metadata.value().offset;
ensure_shape_is_unique();
shape().remove_property_from_unique_shape(property_name.to_string_or_symbol(), deleted_offset);
m_storage.remove(deleted_offset);
return true;
}
void Object::ensure_shape_is_unique()
{
if (shape().is_unique())
return;
m_shape = m_shape->create_unique_clone();
}
Value Object::get_by_index(u32 property_index) const
{
const Object* object = this;
while (object) {
if (is<StringObject>(*this)) {
auto& string = static_cast<const StringObject*>(this)->primitive_string().string();
if (property_index < string.length())
return js_string(heap(), string.substring(property_index, 1));
return js_undefined();
}
if (static_cast<size_t>(property_index) < object->m_indexed_properties.array_like_size()) {
auto result = object->m_indexed_properties.get(const_cast<Object*>(this), property_index);
if (vm().exception())
return {};
if (result.has_value() && !result.value().value.is_empty())
return result.value().value;
return {};
}
object = object->prototype();
if (vm().exception())
return {};
}
return {};
}
Value Object::get(const PropertyName& property_name, Value receiver) const
{
VERIFY(property_name.is_valid());
if (property_name.is_number())
return get_by_index(property_name.as_number());
if (property_name.is_string()) {
auto property_string = property_name.to_string();
i32 property_index = property_string.to_int().value_or(-1);
if (property_index >= 0)
return get_by_index(property_index);
}
if (receiver.is_empty())
receiver = Value(this);
const Object* object = this;
while (object) {
auto value = object->get_own_property(property_name, receiver);
if (vm().exception())
return {};
if (!value.is_empty())
return value;
object = object->prototype();
if (vm().exception())
return {};
}
return {};
}
bool Object::put_by_index(u32 property_index, Value value)
{
VERIFY(!value.is_empty());
// If there's a setter in the prototype chain, we go to the setter.
// Otherwise, it goes in the own property storage.
Object* object = this;
while (object) {
auto existing_value = object->m_indexed_properties.get(nullptr, property_index, false);
if (existing_value.has_value()) {
auto value_here = existing_value.value();
if (value_here.value.is_accessor()) {
value_here.value.as_accessor().call_setter(object, value);
return true;
}
if (value_here.value.is_native_property()) {
// FIXME: Why doesn't put_by_index() receive the receiver value from put()?!
auto receiver = this;
call_native_property_setter(value_here.value.as_native_property(), receiver, value);
return true;
}
}
object = object->prototype();
if (vm().exception())
return {};
}
return put_own_property_by_index(property_index, value, default_attributes, PutOwnPropertyMode::Put);
}
bool Object::put(const PropertyName& property_name, Value value, Value receiver)
{
VERIFY(property_name.is_valid());
if (property_name.is_number())
return put_by_index(property_name.as_number(), value);
VERIFY(!value.is_empty());
if (property_name.is_string()) {
auto& property_string = property_name.as_string();
i32 property_index = property_string.to_int().value_or(-1);
if (property_index >= 0)
return put_by_index(property_index, value);
}
auto string_or_symbol = property_name.to_string_or_symbol();
if (receiver.is_empty())
receiver = Value(this);
// If there's a setter in the prototype chain, we go to the setter.
// Otherwise, it goes in the own property storage.
Object* object = this;
while (object) {
auto metadata = object->shape().lookup(string_or_symbol);
if (metadata.has_value()) {
auto value_here = object->m_storage[metadata.value().offset];
if (value_here.is_accessor()) {
value_here.as_accessor().call_setter(receiver, value);
return true;
}
if (value_here.is_native_property()) {
call_native_property_setter(value_here.as_native_property(), receiver, value);
return true;
}
}
object = object->prototype();
if (vm().exception())
return false;
}
return put_own_property(string_or_symbol, value, default_attributes, PutOwnPropertyMode::Put);
}
bool Object::define_native_function(const StringOrSymbol& property_name, AK::Function<Value(VM&, GlobalObject&)> native_function, i32 length, PropertyAttributes attribute)
{
auto& vm = this->vm();
String function_name;
if (property_name.is_string()) {
function_name = property_name.as_string();
} else {
function_name = String::formatted("[{}]", property_name.as_symbol()->description());
}
auto* function = NativeFunction::create(global_object(), function_name, move(native_function));
function->define_property_without_transition(vm.names.length, Value(length), Attribute::Configurable);
if (vm.exception())
return {};
function->define_property_without_transition(vm.names.name, js_string(vm.heap(), function_name), Attribute::Configurable);
if (vm.exception())
return {};
return define_property(property_name, function, attribute);
}
bool Object::define_native_property(const StringOrSymbol& property_name, AK::Function<Value(VM&, GlobalObject&)> getter, AK::Function<void(VM&, GlobalObject&, Value)> setter, PropertyAttributes attribute)
{
return define_property(property_name, heap().allocate_without_global_object<NativeProperty>(move(getter), move(setter)), attribute);
}
void Object::visit_edges(Cell::Visitor& visitor)
{
Cell::visit_edges(visitor);
visitor.visit(m_shape);
for (auto& value : m_storage)
visitor.visit(value);
m_indexed_properties.for_each_value([&visitor](auto& value) {
visitor.visit(value);
});
}
bool Object::has_property(const PropertyName& property_name) const
{
const Object* object = this;
while (object) {
if (object->has_own_property(property_name))
return true;
object = object->prototype();
if (vm().exception())
return false;
}
return false;
}
bool Object::has_own_property(const PropertyName& property_name) const
{
VERIFY(property_name.is_valid());
auto has_indexed_property = [&](u32 index) -> bool {
if (is<StringObject>(*this))
return index < static_cast<const StringObject*>(this)->primitive_string().string().length();
return m_indexed_properties.has_index(index);
};
if (property_name.is_number())
return has_indexed_property(property_name.as_number());
if (property_name.is_string()) {
i32 property_index = property_name.as_string().to_int().value_or(-1);
if (property_index >= 0)
return has_indexed_property(property_index);
}
return shape().lookup(property_name.to_string_or_symbol()).has_value();
}
Value Object::ordinary_to_primitive(Value::PreferredType preferred_type) const
{
VERIFY(preferred_type == Value::PreferredType::String || preferred_type == Value::PreferredType::Number);
auto& vm = this->vm();
Vector<FlyString, 2> method_names;
if (preferred_type == Value::PreferredType::String)
method_names = { vm.names.toString, vm.names.valueOf };
else
method_names = { vm.names.valueOf, vm.names.toString };
for (auto& method_name : method_names) {
auto method = get(method_name);
if (vm.exception())
return {};
if (method.is_function()) {
auto result = vm.call(method.as_function(), const_cast<Object*>(this));
if (!result.is_object())
return result;
}
}
vm.throw_exception<TypeError>(global_object(), ErrorType::Convert, "object", preferred_type == Value::PreferredType::String ? "string" : "number");
return {};
}
Value Object::invoke_internal(const StringOrSymbol& property_name, Optional<MarkedValueList> arguments)
{
auto& vm = this->vm();
auto property = get(property_name).value_or(js_undefined());
if (vm.exception())
return {};
if (!property.is_function()) {
vm.throw_exception<TypeError>(global_object(), ErrorType::NotAFunction, property.to_string_without_side_effects());
return {};
}
return vm.call(property.as_function(), this, move(arguments));
}
Value Object::call_native_property_getter(NativeProperty& property, Value this_value) const
{
auto& vm = this->vm();
CallFrame call_frame;
if (auto* interpreter = vm.interpreter_if_exists())
call_frame.current_node = interpreter->current_node();
call_frame.is_strict_mode = vm.in_strict_mode();
call_frame.this_value = this_value;
vm.push_call_frame(call_frame, global_object());
if (vm.exception())
return {};
auto result = property.get(vm, global_object());
vm.pop_call_frame();
return result;
}
void Object::call_native_property_setter(NativeProperty& property, Value this_value, Value setter_value) const
{
auto& vm = this->vm();
CallFrame call_frame;
if (auto* interpreter = vm.interpreter_if_exists())
call_frame.current_node = interpreter->current_node();
call_frame.is_strict_mode = vm.in_strict_mode();
call_frame.this_value = this_value;
vm.push_call_frame(call_frame, global_object());
if (vm.exception())
return;
property.set(vm, global_object(), setter_value);
vm.pop_call_frame();
}
}
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