But don't hook it into style yet, that'll be a follow-up patch.
I had this patch in my local queue for a bit and there was no point in not
landing it I guess.
The value of this attribute could be stored only in the shadow root (as this
only applies to shadow hosts), but that would make invalidation harder, I think,
so do the obvious thing for now.
Differential Revision: https://phabricator.services.mozilla.com/D51963
--HG--
extra : moz-landing-system : lando
nsCOMArray currently casts a function that takes two `void` pointers into a
function that takes two `nsISupports` pointers. UBSAN doesn't like this.
This commit introduces an extra level of casting machinery. As a result, each
comparison done while sorting goes through an extra level, to get from `(T*,
T*)` comparisons to `(nsISupports*, nsISupports*)` comparisons to `(void*,
void*)` comparisons, as required by `NS_QuickSort()`. It's a bit annoying but I
can't see how else to solve this within the constraint imposed by the existing
`nsCOMArray_base`/`nsCOMArray` split.
Differential Revision: https://phabricator.services.mozilla.com/D51223
--HG--
extra : moz-landing-system : lando
`TaskQueue` wraps an `nsIEventTarget` to provide "one runnable at a
time" execution policies regardless of the underlying implementation of
the wrapped `nsIEventTarget` (e.g. a thread pool). `TaskQueue` also
provides a `nsISerialEventTarget` wrapper, `EventTargetWrapper`, around
itself (!) for consumers who want to continue to provide a more
XPCOM-ish API.
One would think that dispatching tasks to `EventTargetWrapper` with a
given set of flags would pass that set of flags through, unchanged, to
the underlying event target of the wrapped `TaskQueue`.
This pass-through is not the case. `TaskQueue` supports a "tail
dispatch" mode of operation that is somewhat underdocumented. Roughly,
tail dispatch to a `TaskQueue` says (with several other conditions) that
dispatched tasks are held separately and not passed through to the
underlying event target. If a given `TaskQueue` supports tail dispatch
and the dispatcher also supports tail dispatch, any tasks dispatched to
said `TaskQueue` are silently converted to tail dispatched tasks. Since
tail dispatched tasks can't meaningfully have flags associated with
them, the current implementation simply drops any passed flags on the floor.
These flags, however, might be meaningful, and we should attempt to
honor them in the cases we're not doing tail dispatch. (And when we are
doing tail dispatch, we can verify that the requested flags are not
asking for peculiar things.)
Differential Revision: https://phabricator.services.mozilla.com/D51702
--HG--
extra : moz-landing-system : lando
The current API name is bad: we want it to be read "some background
thread", but it could just as easily be read "a singular background
thread", which would lead people to assume that for:
```
NS_DispatchToBackgroundThread(...);
NS_DispatchToBackgroundThread(...);
```
the dispatched tasks will necessarily run in the order they are
dispatched, which is not the case.
Let's try to head off that interpretation by renaming this function.
Differential Revision: https://phabricator.services.mozilla.com/D51703
--HG--
extra : moz-landing-system : lando
nsIDOMWindow is now an empty interface. There are two references to
nsIDOMWindow::openDialog in comments which needed to be updated. There
were also a few forward declarations of nsIDOMWindow that were unused.
Differential Revision: https://phabricator.services.mozilla.com/D51738
--HG--
extra : moz-landing-system : lando
promise rejection event was enabled by default on 69 (bug 1525554).
We could get rid of this preference.
Differential Revision: https://phabricator.services.mozilla.com/D51491
--HG--
extra : moz-landing-system : lando
This way we get the correct values for start-up prefs in the parent process.
Differential Revision: https://phabricator.services.mozilla.com/D51061
--HG--
extra : moz-landing-system : lando
Zibi is working on replacing some string based APIs with some things that return
substrings, so we could use this.
Alternatively he'd have to do something like:
Compare(myCSubstring, nsDependentCSubstring(aTag, strlen(aTag)))
or something of that sort, which looks a bit uglier.
Differential Revision: https://phabricator.services.mozilla.com/D50523
--HG--
extra : moz-landing-system : lando
Zibi is working on replacing some string based APIs with some things that return
substrings, so we could use this.
Alternatively he'd have to do something like:
Compare(myCSubstring, nsDependentCSubstring(aTag, strlen(aTag)))
or something of that sort, which looks a bit uglier.
Differential Revision: https://phabricator.services.mozilla.com/D50523
--HG--
extra : moz-landing-system : lando
In this change we:
- stop treating the nsPluginDirServiceProvider as a directory provider, as its
GetFile implementation was a no-op anyway - registering it didn't make any
difference.
- stop treating it as a class entirely, because the PLID getters were already
static, so instantiating it also didn't do anything.
- move IO from the plugin directory list provider and the Windows-only PLID
getters into nsPluginHost. This enables us to move it off of the main thread
later - the directory getting has to happen on the main thread, but we can
postpone further checks on the nsIFile instances.
- in the process, stop doing exists() calls on files because we can fail more
lazily. This allows us to remove more allowlist entries from
browser_startup_mainthreadio, though the `isDirectory` calls will actually
still cause IO - they don't seem to create IO markers in the profiler.
We will move this IO away from the main thread in subsequent commits.
Depends on D48328
Differential Revision: https://phabricator.services.mozilla.com/D48329
--HG--
extra : moz-landing-system : lando
In this change we:
- stop treating the nsPluginDirServiceProvider as a directory provider, as its
GetFile implementation was a no-op anyway - registering it didn't make any
difference.
- stop treating it as a class entirely, because the PLID getters were already
static, so instantiating it also didn't do anything.
- move IO from the plugin directory list provider and the Windows-only PLID
getters into nsPluginHost. This enables us to move it off of the main thread
later - the directory getting has to happen on the main thread, but we can
postpone further checks on the nsIFile instances.
- in the process, stop doing exists() calls on files because we can fail more
lazily. This allows us to remove more allowlist entries from
browser_startup_mainthreadio, though the `isDirectory` calls will actually
still cause IO - they don't seem to create IO markers in the profiler.
We will move this IO away from the main thread in subsequent commits.
Depends on D48328
Differential Revision: https://phabricator.services.mozilla.com/D48329
--HG--
extra : moz-landing-system : lando
This patch uses the low memory resource notification facility to detect
scenarios where physical memory is running low without polling. This is a
significant change compared to the previous behavior which measured both
available virtual memory (only on 32-bit builds) and available commit space.
Since we're not trying to avoid OOMs anymore we don't save memory reports
anymore when hitting a low-memory condition.
Differential Revision: https://phabricator.services.mozilla.com/D50471
--HG--
extra : moz-landing-system : lando
This patch uses the low memory resource notification facility to detect
scenarios where physical memory is running low without polling. This is a
significant change compared to the previous behavior which measured both
available virtual memory (only on 32-bit builds) and available commit space.
Since we're not trying to avoid OOMs anymore we don't save memory reports
anymore when hitting a low-memory condition.
Differential Revision: https://phabricator.services.mozilla.com/D50471
--HG--
extra : moz-landing-system : lando
The problem is that a GC can be triggered in a number of ways, so scheduling zones in nsJSContext::GarbageCollectNow is not effective. This patch schedules these zones in the GC callback, which is always called at the start of GC. This means we have to change the internal logic slightly to allow the GC callback to schedule addional zones; previously this state was saved and restored before/after running the callback.
Differential Revision: https://phabricator.services.mozilla.com/D51145
--HG--
extra : moz-landing-system : lando
Small changes:
- Ordered #includes.
- Fixed some comments (obsolete remarks, or typos).
- Set `nsMainThreadPtrHolder::mRawPtr` from constructor initializers.
- Modernized `nsMainThreadPtrHolder` copy-prevention.
- Default-initialize `nsMainThreadPtrHolder` members, for extra safety.
- Made `nsMainThreadPtrHandle::get()` `const` (consistent with others).
- Moved nsMainThreadPtrHandle private member to the end.
- Removed now-unused `mozilla::PtrHolder` and `mozilla::PtrHandle` aliases.
Differential Revision: https://phabricator.services.mozilla.com/D51056
--HG--
extra : moz-landing-system : lando
Put them behind a MOZ_HASH_TABLE_CHECKS_ENABLED define, which right now is only
defined in DEBUG builds, preserving behavior.
MakeImmutable becomes an empty inline function when disabled, which should be
zero-cost.
Differential Revision: https://phabricator.services.mozilla.com/D50493
--HG--
extra : moz-landing-system : lando
Default constructors of members run if not specified there, and these ifdefs
are ugly.
Differential Revision: https://phabricator.services.mozilla.com/D50492
--HG--
extra : moz-landing-system : lando
I want to maybe enable some of these checks in DIAGNOSTIC_ASSERT builds.
The whole type is compiled out in release builds at the moment.
Differential Revision: https://phabricator.services.mozilla.com/D50491
--HG--
extra : moz-landing-system : lando
This replaces a direct call of an object's finalizer with a more formal API. This adds some assertions and passes a valid FreeOp pointer to the finalizer rather than null.
Differential Revision: https://phabricator.services.mozilla.com/D50571
--HG--
extra : moz-landing-system : lando
This renames the JSStringFinalizer struct to JSExternalStringCallbacks,
makes it a virtual class, and adds a size-of callback to it (to replace
the per-runtime callback).
This will make it possible to implement this callback easily for the
NewExternalString testing function (which we want for bug 1590641)
without having to move this testing function to shell/js.cpp
Differential Revision: https://phabricator.services.mozilla.com/D50234
--HG--
extra : moz-landing-system : lando
We could try to move the EnforcePendingTaskGuarantee() bit into
PeekIdleDeadline, but then we'd need to check HasReadyEvent() on
mDeferredTimersQueue and mIdleQueue before we possibly unlock the mutex under
PeekIdleDeadline, and it's not clear that that state cannot change once the
mutex is unlocked...
The EnsureIsActive() call at the end of GetIdleDeadlineInternal in the !aIsPeek
case only makes sense if there are in fact idle tasks available to run when
GetDeadlineForIdleTask is called, because otherwise it would incorrectly set us
active when we are not running any tasks.
Differential Revision: https://phabricator.services.mozilla.com/D49696
--HG--
rename : xpcom/threads/PrioritizedEventQueue.cpp => xpcom/threads/IdlePeriodState.cpp
rename : xpcom/threads/PrioritizedEventQueue.h => xpcom/threads/IdlePeriodState.h
extra : moz-landing-system : lando
Today I reviewed wrong usage of this API.
It'd be good if it crashed in debug builds when misused.
Differential Revision: https://phabricator.services.mozilla.com/D49778
--HG--
extra : moz-landing-system : lando
We could try to move the EnforcePendingTaskGuarantee() bit into PeekIdleDeadline, but
then we'd need to check HasReadyEvent() on mDeferredTimersQueue and mIdleQueue
before we unlock the mutex and PeekIdleDeadline, and it's not clear that that
state cannot change once the mutex is unlocked...
The EnsureIsActive() call at the end of GetIdleDeadlineInternal in the !aIsPeek
case only makes sense if there are in fact idle tasks available to run when
GetDeadlineForIdleTask is called, because otherwise it would incorrectly set us
active when we are not running any tasks.
Differential Revision: https://phabricator.services.mozilla.com/D49696
--HG--
rename : xpcom/threads/PrioritizedEventQueue.cpp => xpcom/threads/IdlePeriodState.cpp
rename : xpcom/threads/PrioritizedEventQueue.h => xpcom/threads/IdlePeriodState.h
extra : moz-landing-system : lando
We want to remove flat strings (JSFlatString). With this patch we only expose
linear strings (JSLinearString) to API consumers.
This is very mechanical for the most part, because code typically only cares
about linear strings and not the null-termination aspect.
CTypes's Library.cpp has some Windows-specific code where we relied on null-terminated
strings. This patch adds JS_CopyStringCharsZ for that use case.
Differential Revision: https://phabricator.services.mozilla.com/D48314
--HG--
extra : moz-landing-system : lando
This method turned out to only be used for tracing wrapper cached things. The wrapper cache has its own way of implementing barriers and contains a raw JSObject pointer. Changing this trace method to take an nsWrapperCache pointer (effectively a JSObjct**) enforces correct use of Heap<T> for other TraceCallbacks callers.
Differential Revision: https://phabricator.services.mozilla.com/D48693
--HG--
extra : moz-landing-system : lando
This was disabled in Bug 1441558 because it broke the mingw-gcc build.
But it doesn't break the mingw-clang build, and we don't support mingw-gcc
anymore, so we can re-enable it.
Differential Revision: https://phabricator.services.mozilla.com/D48645
--HG--
extra : moz-landing-system : lando
People keep shooting themselves in the feet because of this codepath and writing
slow code.
There are just a few elements with bindings left, so just check those.
Also simplify a bit the code. The XUL element + tagname check should be pretty
fast now, and ComputedStyle objects no longer keep weak pointers to pres
contexts and such, so can be safely kept on a RefPtr across an style flush.
Differential Revision: https://phabricator.services.mozilla.com/D47995
--HG--
extra : moz-landing-system : lando
This includes some annotations to isOverridableField() that are only necessary at this point in the patch stack; the entire function will be removed shortly.
Differential Revision: https://phabricator.services.mozilla.com/D46565
--HG--
extra : moz-landing-system : lando
This function is needed for people whose needs don't map cleanly to
`NS_DispatchToBackgroundThread`, usually because they're using the event
target to do thread consistency checks. Once we have this function, we
can start converting singleton threads/thread pools that want to use
functionality like the above.
Differential Revision: https://phabricator.services.mozilla.com/D47454
--HG--
extra : moz-landing-system : lando
Eventually, we're going to want to hand out an `nsIEventTarget*` to people
wanting to dispatch to background threads, but for whatever reason not
wanting to use the `NS_DispatchToBackgroundThread` API (probably because
they want to verify correctness by checking that certain methods are, in
fact, running on the background event target). And because we're going to
want to have some sort of division between CPU-bound and IO-bound tasks, we
can't just hand out references to a single thread pool. We need some sort
of intermediate object for both of these goals, and that is what the added
`BackgroundEventTarget` class is.
Differential Revision: https://phabricator.services.mozilla.com/D47343
--HG--
extra : moz-landing-system : lando
It's fairly common for clients to hold a pointer to some private thread
and then inquire about `IsOnCurrentThread` in debug checks. As we
migrate these private threads into some `nsIEventTarget` implementation
that might be running on thread pools, we need to ensure that those
`IsOnCurrentThread` continues to be relatively cheap. The current
implementation for thread pools is not particularly efficient.
The inefficiency comes from having to iterate over all the threads in
the pool. But there's no need to do this; we can just have each thread
set a particular thread-local variable to the thread pool it's running
on, and check the value of that thread-local variable instead.
Differential Revision: https://phabricator.services.mozilla.com/D47139
--HG--
extra : moz-landing-system : lando
We have a number of people starting up singleton threads for the sole
purpose of running a single runnable on them. These consumers often
leave the thread running until some point close to shutdown, or they
never shut it down at all. Let's add a helper function to do the thing
they actually want to do, and then we can modify the implementation of
that function as necessary as we merge singleton threads (and even
thread pools) together.
Differential Revision: https://phabricator.services.mozilla.com/D46997
--HG--
extra : moz-landing-system : lando
To remove the blocking inside nsThread::Init, two things needed
to happen:
- Switch the ThreadInitData value passed as the argument for
ThreadFunc to a heap allocation, so that it can outlive the call
to nsThread::Init.
- Initialize mThread and mEventTarget->mThread to the return
value of PR_CreateThread, so that to the callers, checks which
depend on these values being set can continue to function.
Differential Revision: https://phabricator.services.mozilla.com/D41248
--HG--
extra : moz-landing-system : lando
GetCurrentPhysicalThread and GetCurrentVirtualThread are, in practice,
identical, as the TLS override that GetCurrentVirtualThread depends on
is never actually set. This simply removes that and renames some things/
deletes some comments.
Differential Revision: https://phabricator.services.mozilla.com/D41247
--HG--
extra : moz-landing-system : lando
Defines an android-only version of nsTraceRefcnt::WalkTheStack that takes a function callback, which outputs the stack frame buffer to `__android_log_print`. Also uses `__wrap_dladdr` in MozDescribeCodeAddress, which outputs slightly more informative data for the stack trace (instead of instances of '???/??? [???]').
Differential Revision: https://phabricator.services.mozilla.com/D46868
--HG--
extra : moz-landing-system : lando
Defines an android-only version of nsTraceRefcnt::WalkTheStack that takes a function callback, which outputs the stack frame buffer to `__android_log_print`. Also uses `__wrap_dladdr` in MozDescribeCodeAddress, which outputs slightly more informative data for the stack trace (instead of instances of '???/??? [???]').
Differential Revision: https://phabricator.services.mozilla.com/D46868
--HG--
extra : moz-landing-system : lando
NS_ERROR_DOM_TYPE_ERR is not much better, but this at least allows us to get
rid of NS_ERROR_TYPE_ERR completely...
Differential Revision: https://phabricator.services.mozilla.com/D46485
--HG--
extra : moz-landing-system : lando
This is to get initial feedback/review.
PIdleScheduler.ipdl has the documentation about the basic architecture.
(v15)
Differential Revision: https://phabricator.services.mozilla.com/D45162
--HG--
extra : moz-landing-system : lando
