mirror of
https://github.com/LadybirdBrowser/ladybird
synced 2026-05-10 17:12:41 +02:00
c0e520463e
invalidate_all_prototype_chains_leading_to_this used to scan every prototype shape in the realm and walk each one's chain looking for the mutated shape. That was O(N_prototype_shapes x chain_depth) per mutation and showed up hot in real profiles when a page churned a lot of prototype state during startup. Each prototype shape now keeps a weak list of the prototype shapes whose immediate [[Prototype]] points at the object that owns this shape. The list is registered on prototype-shape creation (clone_for_prototype, set_prototype_shape) and migrated to the new prototype shape when the owning prototype object transitions to a new shape. Invalidation is then a recursive walk over this direct- child registry, costing O(transitive descendants). Saves ~300 ms of main thread time when loading https://youtube.com/ on my Linux machine. :^)
87 lines
3.0 KiB
C++
87 lines
3.0 KiB
C++
/*
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* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
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* Copyright (c) 2022, Andreas Kling <andreas@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Badge.h>
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#include <AK/HashTable.h>
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#include <AK/OwnPtr.h>
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#include <AK/StringView.h>
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#include <AK/Weakable.h>
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#include <LibGC/CellAllocator.h>
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#include <LibGC/Heap.h>
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#include <LibJS/Bytecode/Builtins.h>
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#include <LibJS/Export.h>
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#include <LibJS/Heap/Cell.h>
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#include <LibJS/Runtime/Intrinsics.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS {
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// 9.3 Realms, https://tc39.es/ecma262/#realm-record
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class JS_API Realm final : public Cell {
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GC_CELL(Realm, Cell);
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GC_DECLARE_ALLOCATOR(Realm);
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public:
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struct HostDefined {
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virtual ~HostDefined() = default;
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virtual void visit_edges(Cell::Visitor&) { }
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template<typename T>
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bool fast_is() const = delete;
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virtual bool is_principal_host_defined() const { return false; }
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virtual bool is_synthetic_host_defined() const { return false; }
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};
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template<typename T, typename... Args>
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GC::Ref<T> create(Args&&... args)
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{
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auto object = heap().allocate<T>(forward<Args>(args)...);
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static_cast<Cell*>(object)->initialize(*this);
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return *object;
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}
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static ThrowCompletionOr<NonnullOwnPtr<ExecutionContext>> initialize_host_defined_realm(VM&, Function<Object*(Realm&)> create_global_object, Function<Object*(Realm&)> create_global_this_value);
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[[nodiscard]] Object& global_object() const { return *m_global_object; }
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void set_global_object(GC::Ref<Object> global) { m_global_object = global; }
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[[nodiscard]] GlobalEnvironment& global_environment() const { return *m_global_environment; }
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void set_global_environment(GC::Ref<GlobalEnvironment> environment);
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[[nodiscard]] DeclarativeEnvironment& global_declarative_environment() const { return *m_global_declarative_environment; }
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[[nodiscard]] Intrinsics const& intrinsics() const { return *m_intrinsics; }
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[[nodiscard]] Intrinsics& intrinsics() { return *m_intrinsics; }
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void set_intrinsics(Badge<Intrinsics>, Intrinsics& intrinsics)
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{
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VERIFY(!m_intrinsics);
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m_intrinsics = &intrinsics;
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}
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HostDefined* host_defined() { return m_host_defined; }
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HostDefined const* host_defined() const { return m_host_defined; }
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void set_host_defined(OwnPtr<HostDefined> host_defined) { m_host_defined = move(host_defined); }
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private:
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Realm() = default;
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virtual void visit_edges(Visitor&) override;
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GC::Ptr<Intrinsics> m_intrinsics; // [[Intrinsics]]
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GC::Ptr<Object> m_global_object; // [[GlobalObject]]
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GC::Ptr<DeclarativeEnvironment> m_global_declarative_environment; // Cached from GlobalEnv
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GC::Ptr<GlobalEnvironment> m_global_environment; // [[GlobalEnv]]
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OwnPtr<HostDefined> m_host_defined; // [[HostDefined]]
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};
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}
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