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serenity/Libraries/LibJS/Runtime/ProxyObject.cpp
Andreas Kling 6861c619c6 LibJS: Move most of Interpreter into VM 
This patch moves the exception state, call stack and scope stack from
Interpreter to VM. I'm doing this to help myself discover what the
split between Interpreter and VM should be, by shuffling things around
and seeing what falls where.

With these changes, we no longer have a persistent lexical environment
for the current global object on the Interpreter's call stack. Instead,
we push/pop that environment on Interpreter::run() enter/exit.
Since it should only be used to find the global "this", and not for
variable storage (that goes directly into the global object instead!),
I had to insert some short-circuiting when walking the environment
parent chain during variable lookup.

Note that this is a "stepping stone" commit, not a final design.
2020-09-27 20:26:58 +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().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), ErrorType::ProxyGetPrototypeOfNonExtensible);
return nullptr;
}
return &trap_result.as_object();
}
const Object* ProxyObject::prototype() const
{
if (m_is_revoked) {
interpreter().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), ErrorType::ProxySetPrototypeOfNonExtensible);
return false;
}
return true;
}
bool ProxyObject::is_extensible() const
{
if (m_is_revoked) {
interpreter().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), ErrorType::ProxyIsExtensibleReturn);
return false;
}
return trap_result;
}
bool ProxyObject::prevent_extensions()
{
if (m_is_revoked) {
interpreter().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), ErrorType::ProxyPreventExtensionsReturn);
return false;
}
return trap_result;
}
Optional<PropertyDescriptor> ProxyObject::get_own_property_descriptor(const PropertyName& name) const
{
if (m_is_revoked) {
interpreter().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), ErrorType::ProxyGetOwnDescriptorNonConfigurable);
return {};
}
if (!m_target.is_extensible()) {
if (!vm().exception())
interpreter().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), ErrorType::ProxyGetOwnDescriptorInvalidDescriptor);
return {};
}
if (!result_desc.attributes.is_configurable() && (!target_desc.has_value() || target_desc.value().attributes.is_configurable())) {
interpreter().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), ErrorType::ProxyDefinePropNonExtensible);
return false;
}
if (setting_config_false) {
interpreter().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), ErrorType::ProxyDefinePropIncompatibleDescriptor);
return false;
}
if (setting_config_false && target_desc.value().attributes.is_configurable()) {
interpreter().vm().throw_exception<TypeError>(global_object(), ErrorType::ProxyDefinePropExistingConfigurable);
return false;
}
}
return true;
}
bool ProxyObject::has_property(const PropertyName& name) const
{
if (m_is_revoked) {
interpreter().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), ErrorType::ProxyHasExistingNonConfigurable);
return false;
}
if (!m_target.is_extensible()) {
if (!vm().exception())
interpreter().vm().throw_exception<TypeError>(global_object(), ErrorType::ProxyHasExistingNonExtensible);
return false;
}
}
}
return trap_result;
}
Value ProxyObject::get(const PropertyName& name, Value) const
{
if (m_is_revoked) {
interpreter().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), ErrorType::ProxyGetImmutableDataProperty);
return {};
}
if (target_desc.value().is_accessor_descriptor() && target_desc.value().getter == nullptr && !trap_result.is_undefined()) {
interpreter().vm().throw_exception<TypeError>(global_object(), ErrorType::ProxyGetNonConfigurableAccessor);
return {};
}
}
return trap_result;
}
bool ProxyObject::put(const PropertyName& name, Value value, Value)
{
if (m_is_revoked) {
interpreter().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), ErrorType::ProxySetImmutableDataProperty);
return false;
}
if (target_desc.value().is_accessor_descriptor() && !target_desc.value().setter) {
interpreter().vm().throw_exception<TypeError>(global_object(), ErrorType::ProxySetNonConfigurableAccessor);
}
}
return true;
}
Value ProxyObject::delete_property(const PropertyName& name)
{
if (m_is_revoked) {
interpreter().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), 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().vm().throw_exception<TypeError>(global_object(), 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.vm().throw_exception<TypeError>(global_object(), ErrorType::NotAFunction, Value(this).to_string_without_side_effects().characters());
return {};
}
if (m_is_revoked) {
interpreter.vm().throw_exception<TypeError>(global_object(), 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.vm().throw_exception<TypeError>(global_object(), 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.vm().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.vm().throw_exception<TypeError>(global_object(), ErrorType::NotAConstructor, Value(this).to_string_without_side_effects().characters());
return {};
}
if (m_is_revoked) {
interpreter.vm().throw_exception<TypeError>(global_object(), 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.vm().throw_exception<TypeError>(global_object(), ErrorType::ProxyInvalidTrap, "construct");
return {};
}
MarkedValueList arguments(interpreter.heap());
arguments.append(Value(&m_target));
auto arguments_array = Array::create(interpreter.global_object());
interpreter.vm().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.vm().throw_exception<TypeError>(global_object(), 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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