5ae9419a06
This patch adds an IndexedProperties object for storing indexed properties within an Object. This accomplishes two goals: indexed properties now have an associated descriptor, and objects now gracefully handle sparse properties. The IndexedProperties class is a wrapper around two other classes, one for simple indexed properties storage, and one for general indexed property storage. Simple indexed property storage is the common-case, and is simply a vector of properties which all have attributes of default_attributes (writable, enumerable, and configurable). General indexed property storage is for a collection of indexed properties where EITHER one or more properties have attributes other than default_attributes OR there is a property with a large index (in particular, large is '200' or higher). Indexed properties are now treated relatively the same as storage within the various Object methods. Additionally, there is a custom iterator class for IndexedProperties which makes iteration easy. The iterator skips empty values by default, but can be configured otherwise. Likewise, it evaluates getters by default, but can be set not to.
133 lines
4.3 KiB
C++
133 lines
4.3 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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#pragma once
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#include <AK/FlyString.h>
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#include <AK/HashMap.h>
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#include <AK/OwnPtr.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Runtime/Cell.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS {
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struct Attribute {
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enum {
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Configurable = 1 << 0,
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Enumerable = 1 << 1,
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Writable = 1 << 2,
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HasGet = 1 << 3,
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HasSet = 1 << 4,
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};
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};
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const u8 default_attributes = Attribute::Configurable | Attribute::Writable | Attribute::Enumerable;
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struct PropertyMetadata {
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size_t offset { 0 };
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u8 attributes { 0 };
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};
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struct TransitionKey {
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FlyString property_name;
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u8 attributes { 0 };
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bool operator==(const TransitionKey& other) const
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{
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return property_name == other.property_name
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&& attributes == other.attributes;
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}
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};
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class Shape final : public Cell {
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public:
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virtual ~Shape() override;
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enum class TransitionType {
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Invalid,
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Put,
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Configure,
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Prototype,
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};
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Shape();
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Shape(Shape* previous_shape, const FlyString& property_name, u8 attributes, TransitionType);
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Shape(Shape* previous_shape, Object* new_prototype);
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Shape* create_put_transition(const FlyString& name, u8 attributes);
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Shape* create_configure_transition(const FlyString& name, u8 attributes);
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Shape* create_prototype_transition(Object* new_prototype);
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bool is_unique() const { return m_unique; }
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Shape* create_unique_clone() const;
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Object* prototype() { return m_prototype; }
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const Object* prototype() const { return m_prototype; }
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Optional<PropertyMetadata> lookup(const FlyString&) const;
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const HashMap<FlyString, PropertyMetadata>& property_table() const;
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size_t property_count() const;
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struct Property {
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FlyString key;
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PropertyMetadata value;
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};
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Vector<Property> property_table_ordered() const;
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void set_prototype_without_transition(Object* new_prototype) { m_prototype = new_prototype; }
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void remove_property_from_unique_shape(const FlyString&, size_t offset);
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void add_property_to_unique_shape(const FlyString&, u8 attributes);
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void reconfigure_property_in_unique_shape(const FlyString& property_name, u8 attributes);
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private:
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virtual const char* class_name() const override { return "Shape"; }
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virtual void visit_children(Visitor&) override;
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void ensure_property_table() const;
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mutable OwnPtr<HashMap<FlyString, PropertyMetadata>> m_property_table;
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HashMap<TransitionKey, Shape*> m_forward_transitions;
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Shape* m_previous { nullptr };
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FlyString m_property_name;
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u8 m_attributes { 0 };
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bool m_unique { false };
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Object* m_prototype { nullptr };
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TransitionType m_transition_type { TransitionType::Invalid };
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};
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}
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template<>
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struct AK::Traits<JS::TransitionKey> : public GenericTraits<JS::TransitionKey> {
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static unsigned hash(const JS::TransitionKey& key)
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{
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return pair_int_hash(int_hash(key.attributes), key.property_name.hash());
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}
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};
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