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LibJS: Add [[GlobalThisValue]] internal slot to GlobalEnvironment

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Instead of hardcoding the environment's global object as the return
value of GlobalEnvironment::global_this_value(), it now stores an Object
reference which is passed to the constructor for this purpose.

From the spec (https://tc39.es/ecma262/#sec-global-environment-records):

[[GlobalThisValue]] | Object | The value returned by this in global
scope. Hosts may provide any ECMAScript Object value.
This commit is contained in:
Linus Groh 2021-09-11 19:58:27 +01:00
parent 2b8d5696ab
commit 1e79934acf
4 changed files with 13 additions and 18 deletions
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17
Userland/Libraries/LibJS/Runtime/GlobalEnvironment.h
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@ -14,7 +14,7 @@ class GlobalEnvironment final : public Environment {
JS_ENVIRONMENT(GlobalEnvironment, Environment);
public:
explicit GlobalEnvironment(GlobalObject&);
GlobalEnvironment(GlobalObject&, Object& this_value);
virtual Optional<Variable> get_from_environment(FlyString const&) const override;
virtual bool put_into_environment(FlyString const&, Variable) override;
@ -30,12 +30,8 @@ public:
virtual Value get_binding_value(GlobalObject&, FlyString const& name, bool strict) override;
virtual bool delete_binding(GlobalObject&, FlyString const& name) override;
Value global_this_value() const;
// [[ObjectRecord]]
ObjectEnvironment& object_record() { return *m_object_record; }
// [[DeclarativeRecord]]
Object& global_this_value() { return *m_global_this_value; }
DeclarativeEnvironment& declarative_record() { return *m_declarative_record; }
bool has_var_declaration(FlyString const& name) const;
@ -50,12 +46,13 @@ private:
virtual bool is_global_environment() const override { return true; }
virtual void visit_edges(Visitor&) override;
ObjectEnvironment* m_object_record { nullptr };
DeclarativeEnvironment* m_declarative_record { nullptr };
Vector<FlyString> m_var_names;
ObjectEnvironment* m_object_record { nullptr }; // [[ObjectRecord]]
Object* m_global_this_value { nullptr }; // [[GlobalThisValue]]
DeclarativeEnvironment* m_declarative_record { nullptr }; // [[DeclarativeRecord]]
Vector<FlyString> m_var_names; // [[VarNames]]
};
template<>
inline bool Environment::fast_is<GlobalEnvironment>() const { return is_global_environment(); }
}