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LibWeb: Report exceptions that occur during microtask callback

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Tim Ledbetter 2024-12-05 10:05:10 +00:00 • committed by Tim Ledbetter
commit 62ecff0b40
Notes: github-actions[bot] 2024-12-19 15:26:16 +00:00
6 changed files with 74 additions and 7 deletions
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4
Libraries/LibWeb/HTML/HTMLCanvasElement.cpp
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@ -375,8 +375,8 @@ WebIDL::ExceptionOr<void> HTMLCanvasElement::to_blob(GC::Ref<WebIDL::CallbackTyp
if (file_result.has_value()) if (file_result.has_value())
blob_result = FileAPI::Blob::create(realm(), file_result->buffer, TRY_OR_THROW_OOM(vm(), String::from_utf8(file_result->mime_type))); blob_result = FileAPI::Blob::create(realm(), file_result->buffer, TRY_OR_THROW_OOM(vm(), String::from_utf8(file_result->mime_type)));
// 2. Invoke callback with « result ». // 2. Invoke callback with « result » and "report".
TRY(WebIDL::invoke_callback(*callback, {}, move(blob_result))); TRY(WebIDL::invoke_callback(*callback, {}, WebIDL::ExceptionBehavior::Report, move(blob_result)));
return {}; return {};
}); });
if (maybe_error.is_throw_completion()) if (maybe_error.is_throw_completion())

8
Libraries/LibWeb/HTML/UniversalGlobalScope.cpp
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@ -84,11 +84,9 @@ void UniversalGlobalScopeMixin::queue_microtask(WebIDL::CallbackType& callback)
if (is<Window>(this_impl())) if (is<Window>(this_impl()))
document = &static_cast<Window&>(this_impl()).associated_document(); document = &static_cast<Window&>(this_impl()).associated_document();
// The queueMicrotask(callback) method must queue a microtask to invoke callback, and if callback throws an exception, report the exception. // The queueMicrotask(callback) method must queue a microtask to invoke callback with « » and "report".
HTML::queue_a_microtask(document, GC::create_function(realm.heap(), [&callback, &realm] { HTML::queue_a_microtask(document, GC::create_function(realm.heap(), [&callback] {
auto result = WebIDL::invoke_callback(callback, {}); (void)WebIDL::invoke_callback(callback, {}, WebIDL::ExceptionBehavior::Report);
if (result.is_error())
HTML::report_exception(result, realm);
})); }));
} }

6
Tests/LibWeb/Text/expected/wpt-import/html/semantics/embedded-content/the-canvas-element/toBlob-cross-realm-callback-report-exception.txt Normal file
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@ -0,0 +1,6 @@
Harness status: OK
Found 1 tests
1 Pass
Pass toBlob() reports the exception from its callback in the callback's global object

6
Tests/LibWeb/Text/expected/wpt-import/html/webappapis/microtask-queuing/queue-microtask-cross-realm-callback-report-exception.txt Normal file
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@ -0,0 +1,6 @@
Harness status: OK
Found 1 tests
1 Pass
Pass queueMicrotask() reports the exception from its callback in the callback's global object

29
Tests/LibWeb/Text/input/wpt-import/html/semantics/embedded-content/the-canvas-element/toBlob-cross-realm-callback-report-exception.html Normal file
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@ -0,0 +1,29 @@
<!doctype html>
<meta charset=utf-8>
<title>toBlob() reports the exception from its callback in the callback's global object</title>
<script src=../../../../resources/testharness.js></script>
<script src=../../../../resources/testharnessreport.js></script>
<iframe srcdoc="<canvas></canvas>"></iframe>
<iframe></iframe>
<iframe></iframe>
<script>
setup({ allow_uncaught_exception: true });
const onerrorCalls = [];
window.onerror = () => { onerrorCalls.push("top"); };
frames[0].onerror = () => { onerrorCalls.push("frame0"); };
frames[1].onerror = () => { onerrorCalls.push("frame1"); };
frames[2].onerror = () => { onerrorCalls.push("frame2"); };
async_test(t => {
window.onload = t.step_func(() => {
const canvas = frames[0].document.querySelector("canvas");
canvas.toBlob(new frames[1].Function(`throw new parent.frames[2].Error("PASS");`));
t.step_timeout(() => {
assert_array_equals(onerrorCalls, ["frame1"]);
t.done();
}, 25);
});
});
</script>

28
Tests/LibWeb/Text/input/wpt-import/html/webappapis/microtask-queuing/queue-microtask-cross-realm-callback-report-exception.html Normal file
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@ -0,0 +1,28 @@
<!doctype html>
<meta charset=utf-8>
<title>queueMicrotask() reports the exception from its callback in the callback's global object</title>
<script src=../../../resources/testharness.js></script>
<script src=../../../resources/testharnessreport.js></script>
<iframe></iframe>
<iframe></iframe>
<iframe></iframe>
<script>
setup({ allow_uncaught_exception: true });
const onerrorCalls = [];
window.onerror = () => { onerrorCalls.push("top"); };
frames[0].onerror = () => { onerrorCalls.push("frame0"); };
frames[1].onerror = () => { onerrorCalls.push("frame1"); };
frames[2].onerror = () => { onerrorCalls.push("frame2"); };
async_test(t => {
window.onload = t.step_func(() => {
frames[0].queueMicrotask(new frames[1].Function(`throw new parent.frames[2].Error("PASS");`));
t.step_timeout(() => {
assert_array_equals(onerrorCalls, ["frame1"]);
t.done();
}, 4);
});
});
</script>