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69bae3fd9a
While initialization common runtime objects like functions, prototypes, etc, we don't really care about tracking transitions for each and every property added to them. This patch puts objects into a "disable transitions" mode while we call initialize() on them. After that, adding more properties will cause new transitions to be generated and added to the chain. This gives a ~10% speed-up on test-js. :^)
128 lines
4.5 KiB
C++
128 lines
4.5 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/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/PropertyAttributes.h>
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#include <LibJS/Runtime/StringOrSymbol.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS {
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struct PropertyMetadata {
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size_t offset { 0 };
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PropertyAttributes attributes { 0 };
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};
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struct TransitionKey {
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StringOrSymbol property_name;
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PropertyAttributes 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 && 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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explicit Shape(GlobalObject&);
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Shape(Shape& previous_shape, const StringOrSymbol& property_name, PropertyAttributes attributes, TransitionType);
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Shape(Shape& previous_shape, Object* new_prototype);
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Shape* create_put_transition(const StringOrSymbol&, PropertyAttributes attributes);
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Shape* create_configure_transition(const StringOrSymbol&, PropertyAttributes attributes);
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Shape* create_prototype_transition(Object* new_prototype);
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void add_property_without_transition(const StringOrSymbol&, PropertyAttributes);
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bool is_unique() const { return m_unique; }
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Shape* create_unique_clone() const;
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GlobalObject& global_object() const { return m_global_object; }
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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 StringOrSymbol&) const;
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const HashMap<StringOrSymbol, PropertyMetadata>& property_table() const;
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size_t property_count() const;
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struct Property {
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StringOrSymbol 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 StringOrSymbol&, size_t offset);
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void add_property_to_unique_shape(const StringOrSymbol&, PropertyAttributes attributes);
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void reconfigure_property_in_unique_shape(const StringOrSymbol& property_name, PropertyAttributes 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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GlobalObject& m_global_object;
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mutable OwnPtr<HashMap<StringOrSymbol, 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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StringOrSymbol m_property_name;
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PropertyAttributes 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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size_t m_property_count { 0 };
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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(key.attributes.bits(), Traits<JS::StringOrSymbol>::hash(key.property_name));
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}
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};
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