LLVM recommends compiling with at least -O1 to have decent performance
with sanitizers enabled. Indeed, this improves CI performance of LibWeb
tests as follows:
GCC on Linux: 160.61s to 119.68s (40.93s faster)
Clang on Linux: 65.56s to 55.64s ( 9.92s faster)
If statements without an else clause generated jumps to the next
instruction, this commit fixes the if statement generation so that it
dosen't produce them anymore.
This is an example of JS code that generates the useless jumps
(a => if(a){}) ();
This avoids having to do O(n) contains() in the various flag accessors.
Yields a ~20% speed-up on the following microbenchmark:
const re = /foo/dgimsvy;
for (let i = 0; i < 1_000_000; ++i)
re.flags;
To help people in troubleshooting problems when running the WPT.sh
script, this change makes the script echo to stdout the complete
“wpt run” invocation (including all the flags and path args).
Invoking exec() entirely blocks the UI application's main thread. Qt
explicitly recommends against this. In practice, it seems prevents some
IPC messages from being handled by the UI until the dialog is closed by
the user.
Instead, use open() (which is non-blocking) and set up a signal handler
to deal with the result.
There was a timing issue here where WebDriver would dismiss a dialog,
and then invoke another endpoint before the dialog was actually closed.
This is because the dismissal first has to hop over to the UI process to
close the graphical dialog, which then asynchronously informs WebContent
of the result. It's not until WebContent receives that result that the
dialog is considered closed, thus those subsequent endpoints would abort
due a dialog being "open".
We now wait for dialogs to be fully closed before returning from the
dismissal endpoints.
Similar to commit c2cf65adac, we should
avoid spinning the event loop from the WebContent-side of the WebDriver
connection. This can result in deadlocks if another component in LibWeb
also spins the event loop.
The AO to await navigations has two event loop spinners - waiting for
the navigation to complete and for the document to reach the target
readiness state. We now use NavigationObserver and DocumentObserver to
be notified when these conditions are met. And we use the same async IPC
mechanism as script execution to notify the WebDriver process when all
conditions are met (or timed out).
This change also removes as much direct use of JS::Promise in LibWeb
as possible. When specs refer to `Promise<T>` they should be assumed
to be referring to the WebIDL Promise type, not the JS::Promise type.
The one exception is the HostPromiseRejectionTracker hook on the JS
VM. This facility and its associated sets and events are intended to
expose the exact opaque object handles that were rejected to author
code. This is not possible with the WebIDL Promise type, so we have
to use JS::Promise or JS::Object to hold onto the promises.
It also exposes which specs need some updates in the area of
promises. WebDriver stands out in this regard. WebAudio could use
some more cross-references to WebIDL as well to clarify things.
This change was made in the HTML spec to address a comment from the
Gecko team for the Streams API in
a20ca78975
It also opens the door for some more Promise related refactors.
This condition was included to implement flex containers with auto
height, but it actually can reset the definitive height to 0 for inline
blocks with only replaced elements such as an SVG. Removing the
condition does not break any in-tree test, so let's improve the
situation on the SVG side of things for now.
Since `Storage::item_value` never returns an empty Optional,
and since `PlatformObject::is_supported_property_index` only
returns false when `item_value` returns an empty Optional,
the loop in `PlatformObject::internal_own_property_keys` will
never terminate when executed on a `Storage` instance.
This fix allows youtube.com to load successfully :^)
We can reuse the same HeapFunction when queueing up a rendering task
on the HTML event loop. No need to create extra work for the garbage
collector like this.
This commit makes LibRegex's atomic loop rewrite opt also accept cases
where the follow block jumps to the end of the forking block
(which is essentially a loop without a proper header in fancy clothes)
This makes patterns like /([^x]*)x/ where the loop is not _immediately_
followed by a block significantly faster.
The order of precedence with the `*` operator sometimes makes it a bit
harder to detect whether or not the result is actually used. Let's fail
compilation if anyone tries to discard the result.
These files seem to have been marked as executable by error.
Found by running the command:
find \( -name WPT -or -name Toolchain -or -name Build \) \
-prune -or -executable \! -type d -print \
| grep -Pv '\.(sh|py)$'
It is easy to forget to set this flag on macOS, where doing so causes
many tests to fail. So let's just set it via code along with other
options to make it a bit more foolproof.
