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5ea0aa5f08
While we don't yet have a working `using` implementation with our byte code, we can still keep our DisposableStack implementation up to date. The changes brought in here are all editorial, and set us up to start an AsyncDisposableStack implementation.
77 lines
2.9 KiB
C++
77 lines
2.9 KiB
C++
/*
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* Copyright (c) 2020-2022, 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/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) GC_CELL(class_, base_class)
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class Environment : public Cell {
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GC_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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AsyncDispose,
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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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[[nodiscard]] bool is_declarative_environment() const { return m_declarative; }
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virtual bool is_global_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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protected:
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enum class IsDeclarative {
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No,
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Yes,
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};
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explicit Environment(Environment* parent, IsDeclarative = IsDeclarative::No);
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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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bool m_declarative { false };
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GC::Ptr<Environment> m_outer_environment;
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};
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}
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