mirrors/ladybird
0
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2025-08-02 06:09:08 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 9

LibWeb: Do not throw exceptions from Promise-type attributes

Browse source 
If an attribute's getter were to throw an exception, we must instead
return a rejected promise. We already supported this behavior for
functions.
This commit is contained in:
Timothy Flynn 2025-04-14 14:52:22 -04:00 • committed by Tim Flynn
commit 8599917188
Notes: github-actions[bot] 2025-04-14 19:51:25 +00:00
2 changed files with 34 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

28
Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
View file

@ -3729,8 +3729,19 @@ JS_DEFINE_NATIVE_FUNCTION(@class_name@::@attribute.getter_callback@)
{
WebIDL::log_trace(vm, "@class_name@::@attribute.getter_callback@");
[[maybe_unused]] auto& realm = *vm.current_realm();
)~~~");
// NOTE: Create a wrapper lambda so that if the function steps return an exception, we can return that in a rejected promise.
if (attribute.type->name() == "Promise"sv) {
attribute_generator.append(R"~~~(
auto steps = [&]() -> JS::ThrowCompletionOr<GC::Ptr<WebIDL::Promise>> {
)~~~");
}
attribute_generator.append(R"~~~(
[[maybe_unused]] auto* impl = TRY(impl_from(vm));
)~~~");
if (attribute.extended_attributes.contains("CEReactions")) {
// 1. Push a new element queue onto this object's relevant agent's custom element reactions stack.
attribute_generator.append(R"~~~(
@ -4069,6 +4080,23 @@ JS_DEFINE_NATIVE_FUNCTION(@class_name@::@attribute.getter_callback@)
}
}
if (attribute.type->name() == "Promise"sv) {
attribute_generator.append(R"~~~(
return retval;
};
auto maybe_retval = steps();
// And then, if an exception E was thrown:
// 1. If attribute’s type is a promise type, then return ! Call(%Promise.reject%, %Promise%, «E»).
// 2. Otherwise, end these steps and allow the exception to propagate.
if (maybe_retval.is_throw_completion())
return WebIDL::create_rejected_promise(realm, maybe_retval.error_value())->promise();
auto retval = maybe_retval.release_value();
)~~~");
}
generate_return_statement(generator, *attribute.type, interface);
attribute_generator.append(R"~~~(