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ladybird/Libraries/LibJS/Runtime/Object.cpp
Andreas Kling e4add19915 LibJS: Pass GlobalObject& to native functions and property accessors 
More work towards supporting multiple global objects. Native C++ code
now get a GlobalObject& and don't have to ask the Interpreter for it.

I've added macros for declaring and defining native callbacks since
this was pretty tedious and this makes it easier next time we want to
change any of these signatures.
2020-06-20 15:45:07 +02:00

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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* 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/String.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(Interpreter& interpreter, const Object& object)
{
PropertyAttributes attributes;
if (object.has_property("configurable")) {
attributes.set_has_configurable();
if (object.get("configurable").value_or(Value(false)).to_boolean())
attributes.set_configurable();
if (interpreter.exception())
return {};
}
if (object.has_property("enumerable")) {
attributes.set_has_enumerable();
if (object.get("enumerable").value_or(Value(false)).to_boolean())
attributes.set_enumerable();
if (interpreter.exception())
return {};
}
if (object.has_property("writable")) {
attributes.set_has_writable();
if (object.get("writable").value_or(Value(false)).to_boolean())
attributes.set_writable();
if (interpreter.exception())
return {};
}
PropertyDescriptor descriptor { attributes, object.get("value"), nullptr, nullptr };
if (interpreter.exception())
return {};
auto getter = object.get("get");
if (interpreter.exception())
return {};
if (getter.is_function())
descriptor.getter = &getter.as_function();
auto setter = object.get("set");
if (interpreter.exception())
return {};
if (setter.is_function())
descriptor.setter = &setter.as_function();
return descriptor;
}
Object* Object::create_empty(Interpreter&, GlobalObject& global_object)
{
return global_object.heap().allocate<Object>(global_object.object_prototype());
}
Object::Object(Object* prototype)
{
if (prototype) {
m_shape = interpreter().global_object().empty_object_shape();
set_prototype(prototype);
} else {
// This is the global object
m_shape = interpreter().heap().allocate<Shape>(static_cast<GlobalObject&>(*this));
}
}
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 (interpreter().exception())
return false;
if (object == prototype)
return true;
}
return false;
}
bool Object::prevent_extensions()
{
m_is_extensible = false;
return true;
}
Value Object::get_own_property(const Object& this_object, PropertyName property_name) const
{
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.as_string());
if (!metadata.has_value())
return {};
value_here = m_storage[metadata.value().offset].value_or(js_undefined());
}
ASSERT(!value_here.is_empty());
if (value_here.is_accessor()) {
return value_here.as_accessor().call_getter(Value(const_cast<Object*>(this)));
}
if (value_here.is_object() && value_here.as_object().is_native_property())
return call_native_property_getter(const_cast<Object*>(&this_object), value_here);
return value_here;
}
Value Object::get_own_properties(const Object& this_object, GetOwnPropertyMode kind, bool only_enumerable_properties) const
{
auto* properties_array = Array::create(global_object());
// FIXME: Support generic iterables
if (this_object.is_string_object()) {
auto str = static_cast<const StringObject&>(this_object).primitive_string().string();
for (size_t i = 0; i < str.length(); ++i) {
if (kind == GetOwnPropertyMode::Key) {
properties_array->define_property(i, js_string(interpreter(), String::number(i)));
} else if (kind == GetOwnPropertyMode::Value) {
properties_array->define_property(i, js_string(interpreter(), String::format("%c", str[i])));
} else {
auto* entry_array = Array::create(global_object());
entry_array->define_property(0, js_string(interpreter(), String::number(i)));
if (interpreter().exception())
return {};
entry_array->define_property(1, js_string(interpreter(), String::format("%c", str[i])));
if (interpreter().exception())
return {};
properties_array->define_property(i, entry_array);
}
if (interpreter().exception())
return {};
}
return properties_array;
}
size_t property_index = 0;
for (auto& entry : m_indexed_properties) {
auto value_and_attributes = entry.value_and_attributes(const_cast<Object*>(&this_object));
if (only_enumerable_properties && !value_and_attributes.attributes.is_enumerable())
continue;
if (kind == GetOwnPropertyMode::Key) {
properties_array->define_property(property_index, js_string(interpreter(), String::number(entry.index())));
} else if (kind == GetOwnPropertyMode::Value) {
properties_array->define_property(property_index, value_and_attributes.value);
} else {
auto* entry_array = Array::create(global_object());
entry_array->define_property(0, js_string(interpreter(), String::number(entry.index())));
if (interpreter().exception())
return {};
entry_array->define_property(1, value_and_attributes.value);
if (interpreter().exception())
return {};
properties_array->define_property(property_index, entry_array);
}
if (interpreter().exception())
return {};
++property_index;
}
for (auto& it : this_object.shape().property_table_ordered()) {
if (only_enumerable_properties && !it.value.attributes.is_enumerable())
continue;
size_t offset = it.value.offset + property_index;
if (kind == GetOwnPropertyMode::Key) {
properties_array->define_property(offset, js_string(interpreter(), it.key));
} else if (kind == GetOwnPropertyMode::Value) {
properties_array->define_property(offset, this_object.get(it.key));
} else {
auto* entry_array = Array::create(global_object());
entry_array->define_property(0, js_string(interpreter(), it.key));
if (interpreter().exception())
return {};
entry_array->define_property(1, this_object.get(it.key));
if (interpreter().exception())
return {};
properties_array->define_property(offset, entry_array);
}
if (interpreter().exception())
return {};
}
return properties_array;
}
Optional<PropertyDescriptor> Object::get_own_property_descriptor(PropertyName property_name) const
{
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.as_string());
if (!metadata.has_value())
return {};
value = m_storage[metadata.value().offset];
if (interpreter().exception())
return {};
attributes = metadata.value().attributes;
}
PropertyDescriptor descriptor { attributes, {}, nullptr, nullptr };
if (value.is_object() && value.as_object().is_native_property()) {
auto result = call_native_property_getter(const_cast<Object*>(this), value);
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(PropertyName property_name) const
{
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(interpreter(), global_object());
descriptor_object->define_property("enumerable", Value(descriptor.attributes.is_enumerable()));
if (interpreter().exception())
return {};
descriptor_object->define_property("configurable", Value(descriptor.attributes.is_configurable()));
if (interpreter().exception())
return {};
if (descriptor.is_data_descriptor()) {
descriptor_object->define_property("value", descriptor.value.value_or(js_undefined()));
if (interpreter().exception())
return {};
descriptor_object->define_property("writable", Value(descriptor.attributes.is_writable()));
if (interpreter().exception())
return {};
} else if (descriptor.is_accessor_descriptor()) {
if (descriptor.getter) {
descriptor_object->define_property("get", Value(descriptor.getter));
if (interpreter().exception())
return {};
}
if (descriptor.setter) {
descriptor_object->define_property("set", Value(descriptor.setter));
if (interpreter().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 FlyString& property_name, const Object& descriptor, bool throw_exceptions)
{
bool is_accessor_property = descriptor.has_property("get") || descriptor.has_property("set");
PropertyAttributes attributes;
if (descriptor.has_property("configurable")) {
attributes.set_has_configurable();
if (descriptor.get("configurable").value_or(Value(false)).to_boolean())
attributes.set_configurable();
if (interpreter().exception())
return false;
}
if (descriptor.has_property("enumerable")) {
attributes.set_has_enumerable();
if (descriptor.get("enumerable").value_or(Value(false)).to_boolean())
attributes.set_enumerable();
if (interpreter().exception())
return false;
}
if (is_accessor_property) {
if (descriptor.has_property("value") || descriptor.has_property("writable")) {
if (throw_exceptions)
interpreter().throw_exception<TypeError>(ErrorType::AccessorValueOrWritable);
return false;
}
auto getter = descriptor.get("get").value_or(js_undefined());
if (interpreter().exception())
return {};
auto setter = descriptor.get("set").value_or(js_undefined());
if (interpreter().exception())
return {};
Function* getter_function { nullptr };
Function* setter_function { nullptr };
if (getter.is_function()) {
getter_function = &getter.as_function();
} else if (!getter.is_undefined()) {
interpreter().throw_exception<TypeError>(ErrorType::AccessorBadField, "get");
return false;
}
if (setter.is_function()) {
setter_function = &setter.as_function();
} else if (!setter.is_undefined()) {
interpreter().throw_exception<TypeError>(ErrorType::AccessorBadField, "set");
return false;
}
dbg() << "Defining new property " << property_name << " with accessor descriptor { attributes=" << attributes << ", "
<< "getter=" << getter.to_string_without_side_effects() << ", "
<< "setter=" << setter.to_string_without_side_effects() << "}";
return define_property(property_name, Accessor::create(interpreter(), getter_function, setter_function), attributes, throw_exceptions);
}
auto value = descriptor.get("value");
if (interpreter().exception())
return {};
if (descriptor.has_property("writable")) {
attributes.set_has_writable();
if (descriptor.get("writable").value_or(Value(false)).to_boolean())
attributes.set_writable();
if (interpreter().exception())
return false;
}
if (interpreter().exception())
return {};
dbg() << "Defining new property " << property_name << " with data descriptor { attributes=" << attributes
<< ", value=" << (value.is_empty() ? "<empty>" : value.to_string_without_side_effects()) << " }";
return define_property(property_name, value, attributes, throw_exceptions);
}
bool Object::define_property(PropertyName property_name, Value value, PropertyAttributes attributes, bool throw_exceptions)
{
if (property_name.is_number())
return put_own_property_by_index(*this, property_name.as_number(), value, attributes, PutOwnPropertyMode::DefineProperty, throw_exceptions);
i32 property_index = property_name.as_string().to_int().value_or(-1);
if (property_index >= 0)
return put_own_property_by_index(*this, property_index, value, attributes, PutOwnPropertyMode::DefineProperty, throw_exceptions);
return put_own_property(*this, property_name.as_string(), value, attributes, PutOwnPropertyMode::DefineProperty, throw_exceptions);
}
bool Object::put_own_property(Object& this_object, const FlyString& property_name, Value value, PropertyAttributes attributes, PutOwnPropertyMode mode, bool throw_exceptions)
{
ASSERT(!(mode == PutOwnPropertyMode::Put && value.is_accessor()));
if (!is_extensible()) {
dbg() << "Disallow define_property of non-extensible object";
if (throw_exceptions && interpreter().in_strict_mode())
interpreter().throw_exception<TypeError>(ErrorType::NonExtensibleDefine, property_name.characters());
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();
}
auto metadata = shape().lookup(property_name);
bool new_property = !metadata.has_value();
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 {
set_shape(*m_shape->create_put_transition(property_name, attributes));
}
metadata = shape().lookup(property_name);
ASSERT(metadata.has_value());
}
if (!new_property && mode == PutOwnPropertyMode::DefineProperty && !metadata.value().attributes.is_configurable() && attributes != metadata.value().attributes) {
dbg() << "Disallow reconfig of non-configurable property";
if (throw_exceptions)
interpreter().throw_exception<TypeError>(ErrorType::DescChangeNonConfigurable, property_name.characters());
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);
dbg() << "Reconfigured property " << property_name << ", new shape says offset is " << metadata.value().offset << " and my storage capacity is " << m_storage.size();
}
auto value_here = m_storage[metadata.value().offset];
if (!new_property && mode == PutOwnPropertyMode::Put && !value_here.is_accessor() && !metadata.value().attributes.is_writable()) {
dbg() << "Disallow write to non-writable property";
return false;
}
if (value.is_empty())
return true;
if (value_here.is_object() && value_here.as_object().is_native_property()) {
call_native_property_setter(const_cast<Object*>(&this_object), value_here, value);
} else {
m_storage[metadata.value().offset] = value;
}
return true;
}
bool Object::put_own_property_by_index(Object& this_object, u32 property_index, Value value, PropertyAttributes attributes, PutOwnPropertyMode mode, bool throw_exceptions)
{
ASSERT(!(mode == PutOwnPropertyMode::Put && value.is_accessor()));
if (!is_extensible()) {
dbg() << "Disallow define_property of non-extensible object";
if (throw_exceptions && interpreter().in_strict_mode())
interpreter().throw_exception<TypeError>(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();
}
auto existing_property = m_indexed_properties.get(nullptr, property_index, false);
auto new_property = !existing_property.has_value();
PropertyAttributes existing_attributes = new_property ? 0 : existing_property.value().attributes;
if (!new_property && mode == PutOwnPropertyMode::DefineProperty && !existing_attributes.is_configurable() && attributes != existing_attributes) {
dbg() << "Disallow reconfig of non-configurable property";
if (throw_exceptions)
interpreter().throw_exception<TypeError>(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()) {
dbg() << "Disallow write to non-writable property";
return false;
}
if (value.is_empty())
return true;
if (value_here.is_object() && value_here.as_object().is_native_property()) {
call_native_property_setter(const_cast<Object*>(&this_object), value_here, value);
} else {
m_indexed_properties.put(&this_object, property_index, value, attributes, mode == PutOwnPropertyMode::Put);
}
return true;
}
Value Object::delete_property(PropertyName property_name)
{
ASSERT(property_name.is_valid());
if (property_name.is_number())
return Value(m_indexed_properties.remove(property_name.as_number()));
int property_index = property_name.as_string().to_int().value_or(-1);
if (property_index >= 0)
return Value(m_indexed_properties.remove(property_name.as_number()));
auto metadata = shape().lookup(property_name.as_string());
if (!metadata.has_value())
return Value(true);
if (!metadata.value().attributes.is_configurable())
return Value(false);
size_t deleted_offset = metadata.value().offset;
ensure_shape_is_unique();
shape().remove_property_from_unique_shape(property_name.as_string(), deleted_offset);
m_storage.remove(deleted_offset);
return Value(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_string_object()) {
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 (interpreter().exception())
return {};
if (result.has_value() && !result.value().value.is_empty())
return result.value().value;
return {};
}
object = object->prototype();
if (interpreter().exception())
return {};
}
return {};
}
Value Object::get(PropertyName property_name) const
{
if (property_name.is_number())
return get_by_index(property_name.as_number());
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);
const Object* object = this;
while (object) {
auto value = object->get_own_property(*this, property_name);
if (interpreter().exception())
return {};
if (!value.is_empty())
return value;
object = object->prototype();
if (interpreter().exception())
return {};
}
return {};
}
bool Object::put_by_index(u32 property_index, Value value)
{
ASSERT(!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_object() && value_here.value.as_object().is_native_property()) {
call_native_property_setter(const_cast<Object*>(this), value_here.value, value);
return true;
}
}
object = object->prototype();
if (interpreter().exception())
return {};
}
return put_own_property_by_index(*this, property_index, value, default_attributes, PutOwnPropertyMode::Put);
}
bool Object::put(PropertyName property_name, Value value)
{
if (property_name.is_number())
return put_by_index(property_name.as_number(), value);
ASSERT(!value.is_empty());
auto property_string = property_name.to_string();
i32 property_index = property_string.to_int().value_or(-1);
if (property_index >= 0)
return put_by_index(property_index, value);
// 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(property_string);
if (metadata.has_value()) {
auto value_here = object->m_storage[metadata.value().offset];
if (value_here.is_accessor()) {
value_here.as_accessor().call_setter(Value(this), value);
return true;
}
if (value_here.is_object() && value_here.as_object().is_native_property()) {
call_native_property_setter(const_cast<Object*>(this), value_here, value);
return true;
}
}
object = object->prototype();
if (interpreter().exception())
return {};
}
return put_own_property(*this, property_string, value, default_attributes, PutOwnPropertyMode::Put);
}
bool Object::define_native_function(const FlyString& property_name, AK::Function<Value(Interpreter&, GlobalObject&)> native_function, i32 length, PropertyAttributes attribute)
{
auto* function = NativeFunction::create(interpreter(), global_object(), property_name, move(native_function));
function->define_property("length", Value(length), Attribute::Configurable);
if (interpreter().exception())
return {};
function->define_property("name", js_string(heap(), property_name), Attribute::Configurable);
if (interpreter().exception())
return {};
return define_property(property_name, function, attribute);
}
bool Object::define_native_property(const FlyString& property_name, AK::Function<Value(Interpreter&, GlobalObject&)> getter, AK::Function<void(Interpreter&, GlobalObject&, Value)> setter, PropertyAttributes attribute)
{
return define_property(property_name, heap().allocate<NativeProperty>(move(getter), move(setter)), attribute);
}
void Object::visit_children(Cell::Visitor& visitor)
{
Cell::visit_children(visitor);
visitor.visit(m_shape);
for (auto& value : m_storage)
visitor.visit(value);
for (auto& value : m_indexed_properties.values_unordered())
visitor.visit(value.value);
}
bool Object::has_property(PropertyName property_name) const
{
const Object* object = this;
while (object) {
if (object->has_own_property(property_name))
return true;
object = object->prototype();
if (interpreter().exception())
return false;
}
return false;
}
bool Object::has_own_property(PropertyName property_name) const
{
auto has_indexed_property = [&](u32 index) -> bool {
if (is_string_object())
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());
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.as_string()).has_value();
}
Value Object::to_primitive(Value::PreferredType preferred_type) const
{
Value result = js_undefined();
switch (preferred_type) {
case Value::PreferredType::Default:
case Value::PreferredType::Number: {
result = value_of();
if (result.is_object()) {
result = to_string();
}
break;
}
case Value::PreferredType::String: {
result = to_string();
if (result.is_object())
result = value_of();
break;
}
}
ASSERT(!result.is_object());
return result;
}
Value Object::to_string() const
{
auto to_string_property = get("toString");
if (to_string_property.is_function()) {
auto& to_string_function = to_string_property.as_function();
auto& interpreter = const_cast<Object*>(this)->interpreter();
auto to_string_result = interpreter.call(to_string_function, const_cast<Object*>(this));
if (to_string_result.is_object())
interpreter.throw_exception<TypeError>(ErrorType::Convert, "object", "string");
if (interpreter.exception())
return {};
auto* string = to_string_result.to_primitive_string(interpreter);
if (interpreter.exception())
return {};
return string;
}
return js_string(heap(), String::format("[object %s]", class_name()));
}
Value Object::invoke(const FlyString& property_name, Optional<MarkedValueList> arguments)
{
auto& interpreter = this->interpreter();
auto property = get(property_name).value_or(js_undefined());
if (interpreter.exception())
return {};
if (!property.is_function()) {
interpreter.throw_exception<TypeError>(ErrorType::NotAFunction, property.to_string_without_side_effects().characters());
return {};
}
return interpreter.call(property.as_function(), this, move(arguments));
}
Value Object::call_native_property_getter(Object* this_object, Value property) const
{
ASSERT(property.is_object());
ASSERT(property.as_object().is_native_property());
auto& native_property = static_cast<NativeProperty&>(property.as_object());
auto& call_frame = interpreter().push_call_frame();
call_frame.this_value = this_object;
auto result = native_property.get(interpreter());
interpreter().pop_call_frame();
return result;
}
void Object::call_native_property_setter(Object* this_object, Value property, Value value) const
{
ASSERT(property.is_object());
ASSERT(property.as_object().is_native_property());
auto& native_property = static_cast<NativeProperty&>(property.as_object());
auto& call_frame = interpreter().push_call_frame();
call_frame.this_value = this_object;
native_property.set(interpreter(), value);
interpreter().pop_call_frame();
}
}
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