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aabd82d508
This patch adds FunctionEnvironmentRecord as a subclass of the existing DeclarativeEnvironmentRecord. Things that are specific to function environment records move into there, simplifying the base. Most of the abstract operations related to function environment records are rewritten to match the spec exactly. I also had to implement GetThisEnvironment() and GetSuperConstructor() to keep tests working after the changes, so that's nice as well. :^)
66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
/*
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* Copyright (c) 2021, 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 <LibJS/Runtime/DeclarativeEnvironmentRecord.h>
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namespace JS {
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class FunctionEnvironmentRecord final : public DeclarativeEnvironmentRecord {
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JS_OBJECT(FunctionEnvironmentRecord, DeclarativeEnvironmentRecord);
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public:
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enum class ThisBindingStatus : u8 {
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Lexical,
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Initialized,
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Uninitialized,
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};
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FunctionEnvironmentRecord(EnvironmentRecord* parent_scope, HashMap<FlyString, Variable> variables);
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virtual ~FunctionEnvironmentRecord() override;
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// [[ThisValue]]
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Value this_value() const { return m_this_value; }
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void set_this_value(Value value) { m_this_value = value; }
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// Not a standard operation.
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void replace_this_binding(Value this_value) { m_this_value = this_value; }
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// [[ThisBindingStatus]]
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ThisBindingStatus this_binding_status() const { return m_this_binding_status; }
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void set_this_binding_status(ThisBindingStatus status) { m_this_binding_status = status; }
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// [[FunctionObject]]
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Function& function_object() { return *m_function_object; }
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Function const& function_object() const { return *m_function_object; }
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void set_function_object(Function& function) { m_function_object = &function; }
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// [[NewTarget]]
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Value new_target() const { return m_new_target; }
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void set_new_target(Value new_target) { m_new_target = new_target; }
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// Abstract operations
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Value get_super_base() const;
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bool has_super_binding() const;
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virtual bool has_this_binding() const override;
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virtual Value get_this_binding(GlobalObject&) const override;
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Value bind_this_value(GlobalObject&, Value);
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private:
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virtual bool is_function_environment_record() const override { return true; }
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virtual void visit_edges(Visitor&) override;
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Value m_this_value;
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ThisBindingStatus m_this_binding_status { ThisBindingStatus::Uninitialized };
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Function* m_function_object { nullptr };
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Value m_new_target;
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};
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template<>
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inline bool Object::fast_is<FunctionEnvironmentRecord>() const { return is_function_environment_record(); }
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}
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