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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibJS/Runtime/Completion.h>
#include <LibJS/Runtime/DeclarativeEnvironment.h>
#include <LibJS/Runtime/ECMAScriptFunctionObject.h>
namespace JS {
class FunctionEnvironment final : public DeclarativeEnvironment {
JS_ENVIRONMENT(FunctionEnvironment, DeclarativeEnvironment);
public:
enum class ThisBindingStatus : u8 {
Lexical,
Initialized,
Uninitialized,
};
virtual ~FunctionEnvironment() override = default;
ThisBindingStatus this_binding_status() const { return m_this_binding_status; }
void set_this_binding_status(ThisBindingStatus status) { m_this_binding_status = status; }
ECMAScriptFunctionObject& function_object() { return *m_function_object; }
ECMAScriptFunctionObject const& function_object() const { return *m_function_object; }
void set_function_object(ECMAScriptFunctionObject& function) { m_function_object = &function; }
Value new_target() const { return m_new_target; }
void set_new_target(Value new_target)
{
VERIFY(!new_target.is_empty());
m_new_target = new_target;
}
// Abstract operations
ThrowCompletionOr<Value> get_super_base() const;
bool has_super_binding() const;
virtual bool has_this_binding() const override;
virtual ThrowCompletionOr<Value> get_this_binding(VM&) const override;
ThrowCompletionOr<Value> bind_this_value(VM&, Value);
private:
explicit FunctionEnvironment(Environment* parent_environment);
virtual bool is_function_environment() const override { return true; }
virtual void visit_edges(Visitor&) override;
Value m_this_value; // [[ThisValue]]
ThisBindingStatus m_this_binding_status { ThisBindingStatus::Uninitialized }; // [[ThisBindingStatus]]
ECMAScriptFunctionObject* m_function_object { nullptr }; // [[FunctionObject]]
Value m_new_target { js_undefined() }; // [[NewTarget]]
};
template<>
inline bool Environment::fast_is<FunctionEnvironment>() const { return is_function_environment(); }
}
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