JSClass::convert is no longer used after this, but to minimize the noise, it will be deleted in a separate patch. However all non-nullptr convert hook implementations must be replaced with [@@toPrimitive] methods in this patch to avoid changing the behavior.
The changes in XrayWrapper.cpp fix a pre-existing bug: when an Xray wrapper tries to emit the "Silently denied access" warning, if id is a symbol, the existing code triggers an error trying to convert it to a string for the warning message. Implementing Symbol.toPrimitive revealed this bug; the fix is straightforward.
When workers shut down we discard the event queue rather than running it to completion. Originally workers managed their event queue themselves and would simply iterate through the array of events and cancel them all. After bug 914762 this was done by setting a (thread-)global "canceling" flag and then calling NS_ProcessPendingEvents. But this neglects that a shut down request can be received while the worker is in a sync queue. In this case, calling NS_ProcessPendingEvents will process any events pending in the sync queue, which is *not* the queue we need to cancel.
The fix is, if we are in a sync queue when NotifyInternal is called, to defer clearing the queue until the top-most sync queue is destroyed and we are about to return to the regular event queue. Only then can we call NS_ProcessPendingEvents to clear out the queue. Because we can never process any events from this queue while sync queues are active, the timing of the mass cancellation is unchanged from the perspective of events in the regular queue.
When workers shut down we discard the event queue rather than running it to completion. Originally workers managed their event queue themselves and would simply iterate through the array of events and cancel them all. After bug 914762 this was done by setting a (thread-)global "canceling" flag and then calling NS_ProcessPendingEvents. But this neglects that a shut down request can be received while the worker is in a sync queue. In this case, calling NS_ProcessPendingEvents will process any events pending in the sync queue, which is *not* the queue we need to cancel.
The fix is, if we are in a sync queue when NotifyInternal is called, to defer clearing the queue until the top-most sync queue is destroyed and we are about to return to the regular event queue. Only then can we call NS_ProcessPendingEvents to clear out the queue. Because we can never process any events from this queue while sync queues are active, the timing of the mass cancellation is unchanged from the perspective of events in the regular queue.
JSClass::convert is no longer used after this, but to minimize the noise, it will be deleted in a separate patch. However all non-nullptr convert hook implementations must be replaced with [@@toPrimitive] methods in this patch to avoid changing the behavior.
The changes in XrayWrapper.cpp fix a pre-existing bug: when an Xray wrapper tries to emit the "Silently denied access" warning, if id is a symbol, the existing code triggers an error trying to convert it to a string for the warning message. Implementing Symbol.toPrimitive revealed this bug; the fix is straightforward.
This refactoring patch separates the preparation of the fetch event
object from its dispatching, so that consumers would be able to
dispatch the event asynchronously.
Jemalloc 4 purges dirty pages regularly during free() when the ratio of dirty
pages compared to active pages is higher than 1 << lg_dirty_mult. We set
lg_dirty_mult in jemalloc_config to limit RSS usage, but it also has an impact
on performance.
So instead of enforcing a high ratio to force more pages being purged, we keep
jemalloc's default ratio of 8, and force a regular purge of all dirty pages,
after cycle collection.
Keeping jemalloc's default ratio avoids cycle-collection-triggered purge to
have to go through really all dirty pages when there are a lot, in which case
the normal jemalloc purge during free() will already have kicked in. It also
takes care of everything that doesn't run the cycle collector still having
a level of purge, like plugins in the plugin-container.
At the same time, since jemalloc_purge_freed_pages does nothing with jemalloc 4,
repurpose the MEMORY_FREE_PURGED_PAGES_MS telemetry probe to track the time
spent in this cycle-collector-triggered purge.
Per the product discussion, the Notification API should be disabled in
ServiceWorker in release builds for 42 since the UX isn't great [1].
The aim is to release in 44.
Apologies for the code duplication for pref checking in Notification and
ServiceWorkerRegistration. There isn't a easy way to get
ServiceWorkerRegistration's generated binding to include Notification.h without
having an attribute/method that uses Notification.
[1]: https://mana.mozilla.org/wiki/x/TgAJAw
The semantics of the new attributes are as follows:
* nightlyAndroid only takes effect on Android.
* If both nightlyAndroid and android are specified, nightlyAndroid takes
* precedence.
These two rules allow us to check for the current situation.
The particular warning here was complaining about an unsafe comparison between
a uint32_t and a bool.
Also, remove ALLOW_COMPILER_WARNINGS=True for this directory.
Get rid of having users dispatch control runnables. It was error prone and
required too much reasoning. It was also possible to end up in a state where
callers would dispatch a WorkerRunnable, which would succeed, so they would not
dispatch a WorkerControlRunnable. Then the worker would stop Running,
canceling and releasing the runnable leading to releasing the proxy in an
unclean state. Instead, we AddRef() and add the feature and remove the feature
and Release() on Notify(). If callers successfully run a WorkerRunnable they
clean the proxy. If not, the proxy stays alive until the worker switches to
Canceling state.
The patch removes 455 occurrences of FAIL_ON_WARNINGS from moz.build files, and
adds 78 instances of ALLOW_COMPILER_WARNINGS. About half of those 78 are in
code we control and which should be removable with a little effort.
