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ladybird/Libraries/LibJS/Runtime/ProxyObject.cpp
Andreas Kling 676cb87a8f LibJS: Use VM::exception() instead of Interpreter::exception() a bunch 
There's a lot more of these things to fix. We'll also want to move from
passing Interpreter& around to VM& instead wherever that is enough.
2020-09-22 20:10:20 +02:00

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/*
* Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
* 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 <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/ProxyObject.h>
namespace JS {
bool static is_compatible_property_descriptor(Interpreter& interpreter, bool is_extensible, PropertyDescriptor new_descriptor, Optional<PropertyDescriptor> current_descriptor_optional)
{
if (!current_descriptor_optional.has_value())
return is_extensible;
auto current_descriptor = current_descriptor_optional.value();
if (new_descriptor.attributes.is_empty() && new_descriptor.value.is_empty() && !new_descriptor.getter && !new_descriptor.setter)
return true;
if (!current_descriptor.attributes.is_configurable()) {
if (new_descriptor.attributes.is_configurable())
return false;
if (new_descriptor.attributes.has_enumerable() && new_descriptor.attributes.is_enumerable() != current_descriptor.attributes.is_enumerable())
return false;
}
if (new_descriptor.is_generic_descriptor())
return true;
if (current_descriptor.is_data_descriptor() != new_descriptor.is_data_descriptor() && !current_descriptor.attributes.is_configurable())
return false;
if (current_descriptor.is_data_descriptor() && new_descriptor.is_data_descriptor() && !current_descriptor.attributes.is_configurable() && !current_descriptor.attributes.is_writable()) {
if (new_descriptor.attributes.is_writable())
return false;
return new_descriptor.value.is_empty() && same_value(interpreter, new_descriptor.value, current_descriptor.value);
}
return true;
}
ProxyObject* ProxyObject::create(GlobalObject& global_object, Object& target, Object& handler)
{
return global_object.heap().allocate<ProxyObject>(global_object, target, handler, *global_object.proxy_prototype());
}
ProxyObject::ProxyObject(Object& target, Object& handler, Object& prototype)
: Function(prototype)
, m_target(target)
, m_handler(handler)
{
}
ProxyObject::~ProxyObject()
{
}
Object* ProxyObject::prototype()
{
if (m_is_revoked) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyRevoked);
return nullptr;
}
auto trap = m_handler.get("getPrototypeOf");
if (vm().exception())
return nullptr;
if (trap.is_empty() || trap.is_undefined() || trap.is_null())
return m_target.prototype();
if (!trap.is_function()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyInvalidTrap, "getPrototypeOf");
return nullptr;
}
auto trap_result = interpreter().call(trap.as_function(), Value(&m_handler), Value(&m_target));
if (vm().exception())
return nullptr;
if (!trap_result.is_object() && !trap_result.is_null()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyGetPrototypeOfReturn);
return nullptr;
}
if (m_target.is_extensible()) {
if (vm().exception())
return nullptr;
if (trap_result.is_null())
return nullptr;
return &trap_result.as_object();
}
auto target_proto = m_target.prototype();
if (vm().exception())
return nullptr;
if (!same_value(interpreter(), trap_result, Value(target_proto))) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyGetPrototypeOfNonExtensible);
return nullptr;
}
return &trap_result.as_object();
}
const Object* ProxyObject::prototype() const
{
if (m_is_revoked) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyRevoked);
return nullptr;
}
return const_cast<const Object*>(const_cast<ProxyObject*>(this)->prototype());
}
bool ProxyObject::set_prototype(Object* object)
{
if (m_is_revoked) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyRevoked);
return false;
}
auto trap = m_handler.get("setPrototypeOf");
if (vm().exception())
return false;
if (trap.is_empty() || trap.is_undefined() || trap.is_null())
return m_target.set_prototype(object);
if (!trap.is_function()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyInvalidTrap, "setPrototypeOf");
return false;
}
auto trap_result = interpreter().call(trap.as_function(), Value(&m_handler), Value(&m_target), Value(object)).to_boolean();
if (vm().exception() || !trap_result)
return false;
if (m_target.is_extensible())
return true;
auto* target_proto = m_target.prototype();
if (vm().exception())
return false;
if (!same_value(interpreter(), Value(object), Value(target_proto))) {
interpreter().throw_exception<TypeError>(ErrorType::ProxySetPrototypeOfNonExtensible);
return false;
}
return true;
}
bool ProxyObject::is_extensible() const
{
if (m_is_revoked) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyRevoked);
return false;
}
auto trap = m_handler.get("isExtensible");
if (vm().exception())
return false;
if (trap.is_empty() || trap.is_undefined() || trap.is_null())
return m_target.is_extensible();
if (!trap.is_function()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyInvalidTrap, "isExtensible");
return {};
}
auto trap_result = interpreter().call(trap.as_function(), Value(&m_handler), Value(&m_target)).to_boolean();
if (vm().exception())
return false;
if (trap_result != m_target.is_extensible()) {
if (!vm().exception())
interpreter().throw_exception<TypeError>(ErrorType::ProxyIsExtensibleReturn);
return false;
}
return trap_result;
}
bool ProxyObject::prevent_extensions()
{
if (m_is_revoked) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyRevoked);
return false;
}
auto trap = m_handler.get("preventExtensions");
if (vm().exception())
return false;
if (trap.is_empty() || trap.is_undefined() || trap.is_null())
return m_target.prevent_extensions();
if (!trap.is_function()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyInvalidTrap, "preventExtensions");
return {};
}
auto trap_result = interpreter().call(trap.as_function(), Value(&m_handler), Value(&m_target)).to_boolean();
if (vm().exception())
return false;
if (trap_result && m_target.is_extensible()) {
if (!vm().exception())
interpreter().throw_exception<TypeError>(ErrorType::ProxyPreventExtensionsReturn);
return false;
}
return trap_result;
}
Optional<PropertyDescriptor> ProxyObject::get_own_property_descriptor(const PropertyName& name) const
{
if (m_is_revoked) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyRevoked);
return {};
}
auto trap = m_handler.get("getOwnPropertyDescriptor");
if (vm().exception())
return {};
if (trap.is_empty() || trap.is_undefined() || trap.is_null())
return m_target.get_own_property_descriptor(name);
if (!trap.is_function()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyInvalidTrap, "getOwnPropertyDescriptor");
return {};
}
auto trap_result = interpreter().call(trap.as_function(), Value(&m_handler), Value(&m_target), js_string(interpreter(), name.to_string()));
if (vm().exception())
return {};
if (!trap_result.is_object() && !trap_result.is_undefined()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyGetOwnDescriptorReturn);
return {};
}
auto target_desc = m_target.get_own_property_descriptor(name);
if (vm().exception())
return {};
if (trap_result.is_undefined()) {
if (!target_desc.has_value())
return {};
if (!target_desc.value().attributes.is_configurable()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyGetOwnDescriptorNonConfigurable);
return {};
}
if (!m_target.is_extensible()) {
if (!vm().exception())
interpreter().throw_exception<TypeError>(ErrorType::ProxyGetOwnDescriptorUndefReturn);
return {};
}
return {};
}
auto result_desc = PropertyDescriptor::from_dictionary(vm(), trap_result.as_object());
if (vm().exception())
return {};
if (!is_compatible_property_descriptor(interpreter(), m_target.is_extensible(), result_desc, target_desc)) {
if (!vm().exception())
interpreter().throw_exception<TypeError>(ErrorType::ProxyGetOwnDescriptorInvalidDescriptor);
return {};
}
if (!result_desc.attributes.is_configurable() && (!target_desc.has_value() || target_desc.value().attributes.is_configurable())) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyGetOwnDescriptorInvalidNonConfig);
return {};
}
return result_desc;
}
bool ProxyObject::define_property(const StringOrSymbol& property_name, const Object& descriptor, bool throw_exceptions)
{
if (m_is_revoked) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyRevoked);
return false;
}
auto trap = m_handler.get("defineProperty");
if (vm().exception())
return false;
if (trap.is_empty() || trap.is_undefined() || trap.is_null())
return m_target.define_property(property_name, descriptor, throw_exceptions);
if (!trap.is_function()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyInvalidTrap, "defineProperty");
return false;
}
auto trap_result = interpreter().call(trap.as_function(), Value(&m_handler), Value(&m_target), property_name.to_value(interpreter()), Value(const_cast<Object*>(&descriptor))).to_boolean();
if (vm().exception() || !trap_result)
return false;
auto target_desc = m_target.get_own_property_descriptor(property_name);
if (vm().exception())
return false;
bool setting_config_false = false;
if (descriptor.has_property("configurable") && !descriptor.get("configurable").to_boolean())
setting_config_false = true;
if (vm().exception())
return false;
if (!target_desc.has_value()) {
if (!m_target.is_extensible()) {
if (!vm().exception())
interpreter().throw_exception<TypeError>(ErrorType::ProxyDefinePropNonExtensible);
return false;
}
if (setting_config_false) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyDefinePropNonConfigurableNonExisting);
return false;
}
} else {
if (!is_compatible_property_descriptor(interpreter(), m_target.is_extensible(), PropertyDescriptor::from_dictionary(vm(), descriptor), target_desc)) {
if (!vm().exception())
interpreter().throw_exception<TypeError>(ErrorType::ProxyDefinePropIncompatibleDescriptor);
return false;
}
if (setting_config_false && target_desc.value().attributes.is_configurable()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyDefinePropExistingConfigurable);
return false;
}
}
return true;
}
bool ProxyObject::has_property(const PropertyName& name) const
{
if (m_is_revoked) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyRevoked);
return false;
}
auto trap = m_handler.get("has");
if (vm().exception())
return false;
if (trap.is_empty() || trap.is_undefined() || trap.is_null())
return m_target.has_property(name);
if (!trap.is_function()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyInvalidTrap, "has");
return false;
}
auto trap_result = interpreter().call(trap.as_function(), Value(&m_handler), Value(&m_target), js_string(interpreter(), name.to_string())).to_boolean();
if (vm().exception())
return false;
if (!trap_result) {
auto target_desc = m_target.get_own_property_descriptor(name);
if (vm().exception())
return false;
if (target_desc.has_value()) {
if (!target_desc.value().attributes.is_configurable()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyHasExistingNonConfigurable);
return false;
}
if (!m_target.is_extensible()) {
if (!vm().exception())
interpreter().throw_exception<TypeError>(ErrorType::ProxyHasExistingNonExtensible);
return false;
}
}
}
return trap_result;
}
Value ProxyObject::get(const PropertyName& name, Value) const
{
if (m_is_revoked) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyRevoked);
return {};
}
auto trap = m_handler.get("get");
if (vm().exception())
return {};
if (trap.is_empty() || trap.is_undefined() || trap.is_null())
return m_target.get(name);
if (!trap.is_function()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyInvalidTrap, "get");
return {};
}
auto trap_result = interpreter().call(trap.as_function(), Value(&m_handler), Value(&m_target), js_string(interpreter(), name.to_string()), Value(const_cast<ProxyObject*>(this)));
if (vm().exception())
return {};
auto target_desc = m_target.get_own_property_descriptor(name);
if (target_desc.has_value()) {
if (vm().exception())
return {};
if (target_desc.value().is_data_descriptor() && !target_desc.value().attributes.is_writable() && !same_value(interpreter(), trap_result, target_desc.value().value)) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyGetImmutableDataProperty);
return {};
}
if (target_desc.value().is_accessor_descriptor() && target_desc.value().getter == nullptr && !trap_result.is_undefined()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyGetNonConfigurableAccessor);
return {};
}
}
return trap_result;
}
bool ProxyObject::put(const PropertyName& name, Value value, Value)
{
if (m_is_revoked) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyRevoked);
return false;
}
auto trap = m_handler.get("set");
if (vm().exception())
return false;
if (trap.is_empty() || trap.is_undefined() || trap.is_null())
return m_target.put(name, value);
if (!trap.is_function()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyInvalidTrap, "set");
return false;
}
auto trap_result = interpreter().call(trap.as_function(), Value(&m_handler), Value(&m_target), js_string(interpreter(), name.to_string()), value, Value(const_cast<ProxyObject*>(this))).to_boolean();
if (vm().exception() || !trap_result)
return false;
auto target_desc = m_target.get_own_property_descriptor(name);
if (vm().exception())
return false;
if (target_desc.has_value() && !target_desc.value().attributes.is_configurable()) {
if (target_desc.value().is_data_descriptor() && !target_desc.value().attributes.is_writable() && !same_value(interpreter(), value, target_desc.value().value)) {
interpreter().throw_exception<TypeError>(ErrorType::ProxySetImmutableDataProperty);
return false;
}
if (target_desc.value().is_accessor_descriptor() && !target_desc.value().setter) {
interpreter().throw_exception<TypeError>(ErrorType::ProxySetNonConfigurableAccessor);
}
}
return true;
}
Value ProxyObject::delete_property(const PropertyName& name)
{
if (m_is_revoked) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyRevoked);
return {};
}
auto trap = m_handler.get("deleteProperty");
if (vm().exception())
return {};
if (trap.is_empty() || trap.is_undefined() || trap.is_null())
return m_target.delete_property(name);
if (!trap.is_function()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyInvalidTrap, "deleteProperty");
return {};
}
auto trap_result = interpreter().call(trap.as_function(), Value(&m_handler), Value(&m_target), js_string(interpreter(), name.to_string())).to_boolean();
if (vm().exception())
return {};
if (!trap_result)
return Value(false);
auto target_desc = m_target.get_own_property_descriptor(name);
if (vm().exception())
return {};
if (!target_desc.has_value())
return Value(true);
if (!target_desc.value().attributes.is_configurable()) {
interpreter().throw_exception<TypeError>(ErrorType::ProxyDeleteNonConfigurable);
return {};
}
return Value(true);
}
void ProxyObject::visit_children(Cell::Visitor& visitor)
{
Function::visit_children(visitor);
visitor.visit(&m_target);
visitor.visit(&m_handler);
}
Value ProxyObject::call(Interpreter& interpreter)
{
if (!is_function()) {
interpreter.throw_exception<TypeError>(ErrorType::NotAFunction, Value(this).to_string_without_side_effects().characters());
return {};
}
if (m_is_revoked) {
interpreter.throw_exception<TypeError>(ErrorType::ProxyRevoked);
return {};
}
auto trap = m_handler.get("apply");
if (interpreter.exception())
return {};
if (trap.is_empty() || trap.is_undefined() || trap.is_null())
return static_cast<Function&>(m_target).call(interpreter);
if (!trap.is_function()) {
interpreter.throw_exception<TypeError>(ErrorType::ProxyInvalidTrap, "apply");
return {};
}
MarkedValueList arguments(interpreter.heap());
arguments.append(Value(&m_target));
arguments.append(Value(&m_handler));
// FIXME: Pass global object
auto arguments_array = Array::create(interpreter.global_object());
interpreter.for_each_argument([&](auto& argument) {
arguments_array->indexed_properties().append(argument);
});
arguments.append(arguments_array);
return interpreter.call(trap.as_function(), Value(&m_handler), move(arguments));
}
Value ProxyObject::construct(Interpreter& interpreter, Function& new_target)
{
if (!is_function()) {
interpreter.throw_exception<TypeError>(ErrorType::NotAConstructor, Value(this).to_string_without_side_effects().characters());
return {};
}
if (m_is_revoked) {
interpreter.throw_exception<TypeError>(ErrorType::ProxyRevoked);
return {};
}
auto trap = m_handler.get("construct");
if (interpreter.exception())
return {};
if (trap.is_empty() || trap.is_undefined() || trap.is_null())
return static_cast<Function&>(m_target).construct(interpreter, new_target);
if (!trap.is_function()) {
interpreter.throw_exception<TypeError>(ErrorType::ProxyInvalidTrap, "construct");
return {};
}
MarkedValueList arguments(interpreter.heap());
arguments.append(Value(&m_target));
auto arguments_array = Array::create(interpreter.global_object());
interpreter.for_each_argument([&](auto& argument) {
arguments_array->indexed_properties().append(argument);
});
arguments.append(arguments_array);
arguments.append(Value(&new_target));
auto result = interpreter.call(trap.as_function(), Value(&m_handler), move(arguments));
if (!result.is_object()) {
interpreter.throw_exception<TypeError>(ErrorType::ProxyConstructBadReturnType);
return {};
}
return result;
}
const FlyString& ProxyObject::name() const
{
ASSERT(is_function());
return static_cast<Function&>(m_target).name();
}
LexicalEnvironment* ProxyObject::create_environment()
{
ASSERT(is_function());
return static_cast<Function&>(m_target).create_environment();
}
}
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