67f7763ab9
Otherwise the garbage collector will eat them way too soon! This made it impossible to use "js -g" without crashing.
221 lines
7.3 KiB
C++
221 lines
7.3 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/String.h>
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#include <LibJS/Heap/Heap.h>
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#include <LibJS/Interpreter.h>
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#include <LibJS/Runtime/Array.h>
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#include <LibJS/Runtime/NativeFunction.h>
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#include <LibJS/Runtime/NativeProperty.h>
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#include <LibJS/Runtime/Object.h>
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#include <LibJS/Runtime/Shape.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS {
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Object::Object()
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{
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m_shape = interpreter().empty_object_shape();
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m_shape->set_prototype_without_transition(interpreter().object_prototype());
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}
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Object::~Object()
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{
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}
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Object* Object::prototype()
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{
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return shape().prototype();
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}
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const Object* Object::prototype() const
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{
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return shape().prototype();
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}
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void Object::set_prototype(Object* new_prototype)
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{
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m_shape = m_shape->create_prototype_transition(new_prototype);
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}
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bool Object::has_prototype(const Object* prototype) const
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{
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for (auto* object = this->prototype(); object; object = object->prototype()) {
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if (object == prototype)
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return true;
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}
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return false;
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}
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Optional<Value> Object::get_own_property(const Object& this_object, const FlyString& property_name) const
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{
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auto metadata = shape().lookup(property_name);
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if (!metadata.has_value())
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return {};
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auto value_here = m_storage[metadata.value().offset];
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if (value_here.is_object() && value_here.as_object().is_native_property()) {
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auto& native_property = static_cast<const NativeProperty&>(value_here.as_object());
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auto& interpreter = const_cast<Object*>(this)->interpreter();
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auto& call_frame = interpreter.push_call_frame();
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call_frame.this_value = const_cast<Object*>(&this_object);
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auto result = native_property.get(interpreter);
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interpreter.pop_call_frame();
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return result;
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}
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return value_here;
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}
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void Object::set_shape(Shape& new_shape)
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{
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m_storage.resize(new_shape.property_count());
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m_shape = &new_shape;
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}
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bool Object::put_own_property(Object& this_object, const FlyString& property_name, Value value)
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{
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auto metadata = shape().lookup(property_name);
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if (!metadata.has_value()) {
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auto* new_shape = m_shape->create_put_transition(property_name, 0);
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set_shape(*new_shape);
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metadata = shape().lookup(property_name);
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ASSERT(metadata.has_value());
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}
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auto value_here = m_storage[metadata.value().offset];
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if (value_here.is_object() && value_here.as_object().is_native_property()) {
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auto& native_property = static_cast<NativeProperty&>(value_here.as_object());
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auto& interpreter = const_cast<Object*>(this)->interpreter();
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auto& call_frame = interpreter.push_call_frame();
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call_frame.this_value = &this_object;
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native_property.set(interpreter, value);
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interpreter.pop_call_frame();
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} else {
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m_storage[metadata.value().offset] = value;
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}
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return true;
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}
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Optional<Value> Object::get(const FlyString& property_name) const
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{
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const Object* object = this;
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while (object) {
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auto value = object->get_own_property(*this, property_name);
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if (value.has_value())
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return value.value();
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object = object->prototype();
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}
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return {};
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}
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void Object::put(const FlyString& property_name, Value value)
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{
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// If there's a setter in the prototype chain, we go to the setter.
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// Otherwise, it goes in the own property storage.
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Object* object = this;
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while (object) {
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auto metadata = object->shape().lookup(property_name);
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if (metadata.has_value()) {
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auto value_here = object->m_storage[metadata.value().offset];
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if (value_here.is_object() && value_here.as_object().is_native_property()) {
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auto& native_property = static_cast<NativeProperty&>(value_here.as_object());
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auto& interpreter = const_cast<Object*>(this)->interpreter();
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auto& call_frame = interpreter.push_call_frame();
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call_frame.this_value = this;
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native_property.set(interpreter, value);
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interpreter.pop_call_frame();
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return;
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}
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}
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object = object->prototype();
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}
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put_own_property(*this, property_name, value);
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}
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void Object::put_native_function(const FlyString& property_name, AK::Function<Value(Interpreter&)> native_function, i32 length)
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{
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auto* function = heap().allocate<NativeFunction>(move(native_function));
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function->put("length", Value(length));
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put(property_name, function);
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}
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void Object::put_native_property(const FlyString& property_name, AK::Function<Value(Interpreter&)> getter, AK::Function<void(Interpreter&, Value)> setter)
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{
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put(property_name, heap().allocate<NativeProperty>(move(getter), move(setter)));
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}
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void Object::visit_children(Cell::Visitor& visitor)
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{
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Cell::visit_children(visitor);
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visitor.visit(m_shape);
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for (auto& value : m_storage)
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visitor.visit(value);
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}
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bool Object::has_own_property(const FlyString& property_name) const
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{
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return shape().lookup(property_name).has_value();
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}
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Value Object::to_primitive(PreferredType preferred_type) const
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{
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Value result = js_undefined();
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switch (preferred_type) {
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case PreferredType::Default:
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case PreferredType::Number: {
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result = value_of();
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if (result.is_object()) {
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result = to_string();
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}
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break;
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}
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case PreferredType::String: {
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result = to_string();
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if (result.is_object())
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result = value_of();
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break;
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}
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}
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ASSERT(!result.is_object());
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return result;
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}
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Value Object::to_string() const
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{
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auto to_string_property = get("toString");
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if (to_string_property.has_value()
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&& to_string_property.value().is_object()
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&& to_string_property.value().as_object().is_function()) {
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auto& to_string_function = static_cast<Function&>(to_string_property.value().as_object());
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return const_cast<Object*>(this)->interpreter().call(&to_string_function, const_cast<Object*>(this));
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}
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return js_string(heap(), String::format("[object %s]", class_name()));
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}
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}
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