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https://github.com/RGBCube/serenity
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3626a7fd6d
The this value is only supposed to be set via the BindThisValue and accessed via the GetThisBinding AOs, so exposing a direct getter/setter would only lead to potentially non-spec-compliant behavior down the line.
62 lines
2.2 KiB
C++
62 lines
2.2 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/Completion.h>
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#include <LibJS/Runtime/DeclarativeEnvironment.h>
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#include <LibJS/Runtime/ECMAScriptFunctionObject.h>
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namespace JS {
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class FunctionEnvironment final : public DeclarativeEnvironment {
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JS_ENVIRONMENT(FunctionEnvironment, DeclarativeEnvironment);
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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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explicit FunctionEnvironment(Environment* parent_scope);
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virtual ~FunctionEnvironment() override;
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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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ECMAScriptFunctionObject& function_object() { return *m_function_object; }
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ECMAScriptFunctionObject const& function_object() const { return *m_function_object; }
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void set_function_object(ECMAScriptFunctionObject& function) { m_function_object = &function; }
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Value new_target() const { return m_new_target; }
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void set_new_target(Value new_target)
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{
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VERIFY(!new_target.is_empty());
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m_new_target = new_target;
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}
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// Abstract operations
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ThrowCompletionOr<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 ThrowCompletionOr<Value> get_this_binding(GlobalObject&) const override;
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ThrowCompletionOr<Value> bind_this_value(GlobalObject&, Value);
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private:
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virtual bool is_function_environment() const override { return true; }
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virtual void visit_edges(Visitor&) override;
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Value m_this_value; // [[ThisValue]]
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ThisBindingStatus m_this_binding_status { ThisBindingStatus::Uninitialized }; // [[ThisBindingStatus]]
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ECMAScriptFunctionObject* m_function_object { nullptr }; // [[FunctionObject]]
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Value m_new_target { js_undefined() }; // [[NewTarget]]
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};
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template<>
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inline bool Environment::fast_is<FunctionEnvironment>() const { return is_function_environment(); }
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}
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