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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
16 changed files with 241 additions and 92 deletions
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10
Libraries/LibJS/AST.cpp
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@ -101,7 +101,7 @@ Value FunctionDeclaration::execute(Interpreter&, GlobalObject&) const
Value FunctionExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
return ScriptFunction::create(global_object, name(), body(), parameters(), function_length(), interpreter.current_environment(), is_strict_mode() || interpreter.vm().in_strict_mode(), m_is_arrow_function);
return ScriptFunction::create(global_object, name(), body(), parameters(), function_length(), interpreter.current_scope(), is_strict_mode() || interpreter.vm().in_strict_mode(), m_is_arrow_function);
}
Value ExpressionStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
@ -128,7 +128,7 @@ CallExpression::ThisAndCallee CallExpression::compute_this_and_callee(Interprete
if (m_callee->is_member_expression()) {
auto& member_expression = static_cast<const MemberExpression&>(*m_callee);
bool is_super_property_lookup = member_expression.object().is_super_expression();
auto lookup_target = is_super_property_lookup ? vm.current_environment()->get_super_base() : member_expression.object().execute(interpreter, global_object);
auto lookup_target = is_super_property_lookup ? interpreter.current_environment()->get_super_base() : member_expression.object().execute(interpreter, global_object);
if (vm.exception())
return {};
if (is_super_property_lookup && lookup_target.is_nullish()) {
@ -205,7 +205,7 @@ Value CallExpression::execute(Interpreter& interpreter, GlobalObject& global_obj
if (result.is_object())
new_object = &result.as_object();
} else if (m_callee->is_super_expression()) {
auto* super_constructor = vm.current_environment()->current_function()->prototype();
auto* super_constructor = interpreter.current_environment()->current_function()->prototype();
// FIXME: Functions should track their constructor kind.
if (!super_constructor || !super_constructor->is_function()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotAConstructor, "Super constructor");
@ -215,7 +215,7 @@ Value CallExpression::execute(Interpreter& interpreter, GlobalObject& global_obj
if (vm.exception())
return {};
vm.current_environment()->bind_this_value(global_object, result);
interpreter.current_environment()->bind_this_value(global_object, result);
} else {
result = vm.call(function, this_value, move(arguments));
}
@ -801,7 +801,7 @@ Value ClassDeclaration::execute(Interpreter& interpreter, GlobalObject& global_o
if (interpreter.exception())
return {};
interpreter.current_environment()->set(global_object, m_class_expression->name(), { class_constructor, DeclarationKind::Let });
interpreter.current_scope()->put_to_scope(m_class_expression->name(), { class_constructor, DeclarationKind::Let });
return js_undefined();
}