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LibJS: Use references in CallExpression::compute_this_and_callee()

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This has the nice side effect of giving us a decent error message for
something like undefined.foo() - another useless "ToObject on null or
undefined" gone. :^)
Also turn the various ternary operators into two separate if branches,
they don't really share that much.
This commit is contained in:
Linus Groh 2021-04-15 00:20:16 +02:00 • committed by Andreas Kling
parent 94bc886593
commit 726d631527
1 changed files with 27 additions and 14 deletions
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41
Userland/Libraries/LibJS/AST.cpp
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@ -147,22 +147,35 @@ CallExpression::ThisAndCallee CallExpression::compute_this_and_callee(Interprete
if (is<MemberExpression>(*m_callee)) {
auto& member_expression = static_cast<const MemberExpression&>(*m_callee);
bool is_super_property_lookup = is<SuperExpression>(member_expression.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()) {
vm.throw_exception<TypeError>(global_object, ErrorType::ObjectPrototypeNullOrUndefinedOnSuperPropertyAccess, lookup_target.to_string_without_side_effects());
return {};
Value callee;
Object* this_value = nullptr;
if (is<SuperExpression>(member_expression.object())) {
auto super_base = interpreter.current_environment()->get_super_base();
if (super_base.is_nullish()) {
vm.throw_exception<TypeError>(global_object, ErrorType::ObjectPrototypeNullOrUndefinedOnSuperPropertyAccess, super_base.to_string_without_side_effects());
return {};
}
auto property_name = member_expression.computed_property_name(interpreter, global_object);
if (!property_name.is_valid())
return {};
auto reference = Reference(super_base, property_name);
callee = reference.get(global_object);
if (vm.exception())
return {};
this_value = &vm.this_value(global_object).as_object();
} else {
auto reference = member_expression.to_reference(interpreter, global_object);
if (vm.exception())
return {};
callee = reference.get(global_object);
if (vm.exception())
return {};
this_value = reference.base().to_object(global_object);
if (vm.exception())
return {};
}
auto* this_value = is_super_property_lookup ? &vm.this_value(global_object).as_object() : lookup_target.to_object(global_object);
if (vm.exception())
return {};
auto property_name = member_expression.computed_property_name(interpreter, global_object);
if (!property_name.is_valid())
return {};
auto callee = lookup_target.to_object(global_object)->get(property_name).value_or(js_undefined());
return { this_value, callee };
}
return { &global_object, m_callee->execute(interpreter, global_object) };