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LibJS: Add a scope object abstraction

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Both GlobalObject and LexicalEnvironment now inherit from ScopeObject,
and the VM's call frames point to a ScopeObject chain rather than just
a LexicalEnvironment chain.

This gives us much more flexibility to implement things like "with",
and also unifies some of the code paths that previously required
special handling of the global object.

There's a bunch of more cleanup that can be done in the wake of this
change, and there might be some oversights in the handling of the
"super" keyword, but this generally seems like a good architectural
improvement. :^)
This commit is contained in:
Andreas Kling
2020-11-28 16:02:27 +01:00
parent e1bbc7c075
commit c3fe9b4df8
Notes: sideshowbarker 2024-07-19 01:13:02 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/c3fe9b4df8c
16 changed files with 241 additions and 92 deletions
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6
Libraries/LibJS/Runtime/ScriptFunction.h
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@@ -35,9 +35,9 @@ class ScriptFunction final : public Function {
JS_OBJECT(ScriptFunction, Function);
public:
static ScriptFunction* create(GlobalObject&, const FlyString& name, const Statement& body, Vector<FunctionNode::Parameter> parameters, i32 m_function_length, LexicalEnvironment* parent_environment, bool is_strict, bool is_arrow_function = false);
static ScriptFunction* create(GlobalObject&, const FlyString& name, const Statement& body, Vector<FunctionNode::Parameter> parameters, i32 m_function_length, ScopeObject* parent_scope, bool is_strict, bool is_arrow_function = false);
ScriptFunction(GlobalObject&, const FlyString& name, const Statement& body, Vector<FunctionNode::Parameter> parameters, i32 m_function_length, LexicalEnvironment* parent_environment, Object& prototype, bool is_strict, bool is_arrow_function = false);
ScriptFunction(GlobalObject&, const FlyString& name, const Statement& body, Vector<FunctionNode::Parameter> parameters, i32 m_function_length, ScopeObject* parent_scope, Object& prototype, bool is_strict, bool is_arrow_function = false);
virtual void initialize(GlobalObject&) override;
virtual ~ScriptFunction();
@@ -68,7 +68,7 @@ private:
FlyString m_name;
NonnullRefPtr<Statement> m_body;
const Vector<FunctionNode::Parameter> m_parameters;
LexicalEnvironment* m_parent_environment { nullptr };
ScopeObject* m_parent_scope { nullptr };
i32 m_function_length { 0 };
bool m_is_strict { false };
bool m_is_arrow_function { false };