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LibJS: Begin implementing GlobalEnvironmentRecord

These represent the outermost scope in the environment record
hierarchy. The spec says they should be a "composite" of two things:

- An ObjectEnvironmentRecord wrapping the global object
- A DeclarativeEnvironmentRecord for other declarations

It's not yet clear to me how this should work, so this patch only
implements the first part, an object record wrapping the global object.
This commit is contained in:
Andreas Kling 2021-06-22 17:16:08 +02:00
parent 1d20380859
commit 1f8b6ac3c3
13 changed files with 130 additions and 43 deletions

View file

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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibJS/Runtime/EnvironmentRecord.h>
namespace JS {
class GlobalEnvironmentRecord final : public EnvironmentRecord {
JS_OBJECT(GlobalEnvironmentRecord, EnvironmentRecord);
public:
explicit GlobalEnvironmentRecord(GlobalObject&);
virtual Optional<Variable> get_from_environment_record(FlyString const&) const override;
virtual void put_into_environment_record(FlyString const&, Variable) override;
virtual bool delete_from_environment_record(FlyString const&) override;
virtual bool has_this_binding() const final { return true; }
virtual Value get_this_binding(GlobalObject&) const final;
Value global_this_value() const;
// [[ObjectRecord]]
ObjectEnvironmentRecord& object_record() { return *m_object_record; }
// [[DeclarativeReco rd]]
DeclarativeEnvironmentRecord& declarative_record() { return *m_declarative_record; }
private:
virtual bool is_global_environment_record() const override { return true; }
virtual void visit_edges(Visitor&) override;
GlobalObject& m_global_object;
ObjectEnvironmentRecord* m_object_record { nullptr };
DeclarativeEnvironmentRecord* m_declarative_record { nullptr };
};
template<>
inline bool Object::fast_is<GlobalEnvironmentRecord>() const { return is_global_environment_record(); }
}