1d8ec677a3
We can now stay in machine code for environment variable read accesses as long as they are cached and initialized. 20% speed-up on Octane/zlib.js :^)
74 lines
3 KiB
C++
74 lines
3 KiB
C++
/*
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* Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.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/StringView.h>
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#include <LibJS/Runtime/Completion.h>
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#include <LibJS/Runtime/Object.h>
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namespace JS {
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struct Variable {
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Value value;
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DeclarationKind declaration_kind;
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};
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#define JS_ENVIRONMENT(class_, base_class) JS_CELL(class_, base_class)
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class Environment : public Cell {
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JS_CELL(Environment, Cell);
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public:
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enum class InitializeBindingHint {
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Normal,
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SyncDispose,
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};
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virtual bool has_this_binding() const { return false; }
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virtual ThrowCompletionOr<Value> get_this_binding(VM&) const { return Value {}; }
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virtual Object* with_base_object() const { return nullptr; }
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virtual ThrowCompletionOr<bool> has_binding([[maybe_unused]] DeprecatedFlyString const& name, [[maybe_unused]] Optional<size_t>* out_index = nullptr) const { return false; }
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virtual ThrowCompletionOr<void> create_mutable_binding(VM&, [[maybe_unused]] DeprecatedFlyString const& name, [[maybe_unused]] bool can_be_deleted) { return {}; }
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virtual ThrowCompletionOr<void> create_immutable_binding(VM&, [[maybe_unused]] DeprecatedFlyString const& name, [[maybe_unused]] bool strict) { return {}; }
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virtual ThrowCompletionOr<void> initialize_binding(VM&, [[maybe_unused]] DeprecatedFlyString const& name, Value, InitializeBindingHint) { return {}; }
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virtual ThrowCompletionOr<void> set_mutable_binding(VM&, [[maybe_unused]] DeprecatedFlyString const& name, Value, [[maybe_unused]] bool strict) { return {}; }
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virtual ThrowCompletionOr<Value> get_binding_value(VM&, [[maybe_unused]] DeprecatedFlyString const& name, [[maybe_unused]] bool strict) { return Value {}; }
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virtual ThrowCompletionOr<bool> delete_binding(VM&, [[maybe_unused]] DeprecatedFlyString const& name) { return false; }
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// [[OuterEnv]]
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Environment* outer_environment() { return m_outer_environment; }
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Environment const* outer_environment() const { return m_outer_environment; }
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virtual bool is_global_environment() const { return false; }
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virtual bool is_declarative_environment() const { return false; }
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virtual bool is_function_environment() const { return false; }
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template<typename T>
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bool fast_is() const = delete;
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// This flag is set on the entire variable environment chain when direct eval() is performed.
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// It is used to disable non-local variable access caching.
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bool is_permanently_screwed_by_eval() const { return m_permanently_screwed_by_eval; }
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void set_permanently_screwed_by_eval();
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static FlatPtr is_permanently_screwed_by_eval_offset() { return OFFSET_OF(Environment, m_permanently_screwed_by_eval); }
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static FlatPtr outer_environment_offset() { return OFFSET_OF(Environment, m_outer_environment); }
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protected:
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explicit Environment(Environment* parent);
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virtual void visit_edges(Visitor&) override;
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private:
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bool m_permanently_screwed_by_eval { false };
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GCPtr<Environment> m_outer_environment;
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};
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}
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