This new approach to weak references is roughly modeled after the approach used
by Rust's Arc<T>, and uses an atomic compare-and-swap loop to perform weak to
strong reference upgrades. This approach ends up moving the strong reference
count out of the tracked object and into the weak reference object, as the
strong reference count atomic needs to outlife the object itself.
Rust's Arc Weak::upgrade implementation:
d98d2f57d9/library/alloc/src/sync.rs (L1806-L1837)
Differential Revision: https://phabricator.services.mozilla.com/D102245
This new approach to weak references is roughly modeled after the approach used
by Rust's Arc<T>, and uses an atomic compare-and-swap loop to perform weak to
strong reference upgrades. This approach ends up moving the strong reference
count out of the tracked object and into the weak reference object, as the
strong reference count atomic needs to outlife the object itself.
Rust's Arc Weak::upgrade implementation:
d98d2f57d9/library/alloc/src/sync.rs (L1806-L1837)
Differential Revision: https://phabricator.services.mozilla.com/D102245
Extracts parts of CheckTemporaryStorageLimits into the following new private
member functions of QuotaManager:
* LockedGetOriginInfosExceedingGroupLimit
* LockedGetOriginInfosExceedingGlobalLimit
* GetOriginInfosExceedingLimits
* ClearOrigins
Differential Revision: https://phabricator.services.mozilla.com/D101145
Extracts parts of CheckTemporaryStorageLimits into the following new private
member functions of QuotaManager:
* LockedGetOriginInfosExceedingGroupLimit
* LockedGetOriginInfosExceedingGlobalLimit
* GetOriginInfosExceedingLimits
* ClearOrigins
Differential Revision: https://phabricator.services.mozilla.com/D101145
Extracts parts of CheckTemporaryStorageLimits into the following new private
member functions of QuotaManager:
* LockedGetOriginInfosExceedingGroupLimit
* LockedGetOriginInfosExceedingGlobalLimit
* GetOriginInfosExceedingLimits
* ClearOrigins
Differential Revision: https://phabricator.services.mozilla.com/D101145
Extracts parts of CheckTemporaryStorageLimits into the following new private
member functions of QuotaManager:
* LockedGetOriginInfosExceedingGroupLimit
* LockedGetOriginInfosExceedingGlobalLimit
* GetOriginInfosExceedingLimits
* ClearOrigins
Differential Revision: https://phabricator.services.mozilla.com/D101145
Extracts parts of CheckTemporaryStorageLimits into the following new private
member functions of QuotaManager:
* LockedGetOriginInfosExceedingGroupLimit
* LockedGetOriginInfosExceedingGlobalLimit
* GetOriginInfosExceedingLimits
* ClearOrigins
Differential Revision: https://phabricator.services.mozilla.com/D101145
While at this point PrintfTarget doesn't use double-conversion, add a
test that it can (and thus will) handle the largest double output possible
with the default %f precision.
Differential Revision: https://phabricator.services.mozilla.com/D103431
Bug 608915 switched nsString::AppendFloat to double-conversion, while
handling trailing zero removal on its own. This can be made more
effectively when doing so in double-conversion itself, support for which
was merged upstream in https://github.com/google/double-conversion/pull/149.
This makes the used_exponential_notation outparam unnecessary.
Differential Revision: https://phabricator.services.mozilla.com/D102698
As a preparation to remove `index_` field from ParserAtomEntry,
ParserAtomsTable should maintain a map from ParserAtomEntry pointer to
TaggedParserAtomIndex.
Differential Revision: https://phabricator.services.mozilla.com/D102559
Bug 608915 switched nsString::AppendFloat to double-conversion, while
handling trailing zero removal on its own. This can be made more
effectively when doing so in double-conversion itself, support for which
was merged upstream in https://github.com/google/double-conversion/pull/149.
This makes the used_exponential_notation outparam unnecessary.
Differential Revision: https://phabricator.services.mozilla.com/D102698
I was running into issues where these names would conflict with the type's own Get/Set methods
and these names have the added benefit of indicating a bit more that atomic stuff is going on.
Differential Revision: https://phabricator.services.mozilla.com/D99268
Add tests to cover the cases when the start iterator is in different segments
and within segments at different positions.
Also assert that `mSegment <= aTarget.mSegment`, so it's more easy to see
that `aTarget` mustn't point to an earlier segment.
Depends on D98340
Differential Revision: https://phabricator.services.mozilla.com/D98462
`as<...>()` on an rvalue variant returns the contained value as rvalue-reference.
`match()` on an rvalue variant forwards the contained value as rvalue-reference.
So now the contained values can be efficiently moved-from.
There are also equivalents for `const&&`, which should be rare.
For `match(2+ matchers)`, the static_assert for same return types has been moved to `Impl::matchN`. Also, it doesn't rely on `FunctionTypeTraits` anymore, which has the added benefit of allowing `auto` in individual matchers.
Differential Revision: https://phabricator.services.mozilla.com/D98050
There are also equivalents for `const&&`, which should be rare.
The small change in `LiveSavedFrameCache::insert` was necessary because `*lookup.framePtr()` now returns an rvalue-ref (as it should).
Differential Revision: https://phabricator.services.mozilla.com/D98049
While all toolkit and js-based projects make use of mfbt, some others,
like tools/crashreporter and tools/update-packaging, don't.
So instead of including mfbt from the top-level directory, include it
from the relevant project top-level mozbuilds.
This allows to remove the dependency on mfbt files in the hash for the
minidump-stackwalk and mar-tools toolchains.
Differential Revision: https://phabricator.services.mozilla.com/D98378
This also adds an UnusedZeroEnum template to Result.h, which can be used
for specializing UnusedZero for scoped enum types.
Differential Revision: https://phabricator.services.mozilla.com/D97074
Poison was setup at the start of xpcom init when that was assumed to be early enough.
Since then, Poison was added to Maybe, and Maybe has been used everywhere, including in
our channel implementation. As a result, poison was being used before it was initialized.
This basically meant our poison pointers were being replaced with null instead, which
dances into some more UB than accessing a page we have actually allocated. Also, tsan
noticed that accesses to the value were racing with the initializer actually being
called!
A (dynamic) static initializer forces the poison initialization as we can reasonably
hope without getting CallOnce or singleton patterns involved.
Other changes:
* Cleaned up the outdated documentation for mozWritePoison (the alignment
restriction was removed in Bug 1414901)
* Removed the poison supression from TSan
Differential Revision: https://phabricator.services.mozilla.com/D94251
Allow-list all Python code in tree for use with the black linter, and re-format all code in-tree accordingly.
To produce this patch I did all of the following:
1. Make changes to tools/lint/black.yml to remove include: stanza and update list of source extensions.
2. Run ./mach lint --linter black --fix
3. Make some ad-hoc manual updates to python/mozbuild/mozbuild/test/configure/test_configure.py -- it has some hard-coded line numbers that the reformat breaks.
4. Make some ad-hoc manual updates to `testing/marionette/client/setup.py`, `testing/marionette/harness/setup.py`, and `testing/firefox-ui/harness/setup.py`, which have hard-coded regexes that break after the reformat.
5. Add a set of exclusions to black.yml. These will be deleted in a follow-up bug (1672023).
# ignore-this-changeset
Differential Revision: https://phabricator.services.mozilla.com/D94045
Allow-list all Python code in tree for use with the black linter, and re-format all code in-tree accordingly.
To produce this patch I did all of the following:
1. Make changes to tools/lint/black.yml to remove include: stanza and update list of source extensions.
2. Run ./mach lint --linter black --fix
3. Make some ad-hoc manual updates to python/mozbuild/mozbuild/test/configure/test_configure.py -- it has some hard-coded line numbers that the reformat breaks.
4. Make some ad-hoc manual updates to `testing/marionette/client/setup.py`, `testing/marionette/harness/setup.py`, and `testing/firefox-ui/harness/setup.py`, which have hard-coded regexes that break after the reformat.
5. Add a set of exclusions to black.yml. These will be deleted in a follow-up bug (1672023).
# ignore-this-changeset
Differential Revision: https://phabricator.services.mozilla.com/D94045
Allow-list all Python code in tree for use with the black linter, and re-format all code in-tree accordingly.
To produce this patch I did all of the following:
1. Make changes to tools/lint/black.yml to remove include: stanza and update list of source extensions.
2. Run ./mach lint --linter black --fix
3. Make some ad-hoc manual updates to python/mozbuild/mozbuild/test/configure/test_configure.py -- it has some hard-coded line numbers that the reformat breaks.
4. Add a set of exclusions to black.yml. These will be deleted in a follow-up bug (1672023).
# ignore-this-changeset
Differential Revision: https://phabricator.services.mozilla.com/D94045
I have no idea what the issue is, but this fixes it. I figure it's not
worth putting too much effort into since this was just to make the tests
as DRY as possible, and not actually important.
Differential Revision: https://phabricator.services.mozilla.com/D92237
No longer reset a moved-from Result to an error state, which required
UnusedZero<E>::GetDefaultValue, which was somewhat confusing, and might
also be inefficient. Leaving Result in a valid state, which might be a
success or error state is sufficient.
Differential Revision: https://phabricator.services.mozilla.com/D91250
Per matrix discussion, this is safer to uplift (instead of relying on
the RedirectSink being released on the main thread).
Differential Revision: https://phabricator.services.mozilla.com/D91270
Among other things, there were some misuses of std::forward, and
GenericErrorResult was (presumably accidentally) instatiated with
references as the template argument type, e.g. const nsresult&,
which circumvented the check for not calling it with NS_OK in
ResultExtensions.h
Differential Revision: https://phabricator.services.mozilla.com/D90561
Among other things, there were some misuses of std::forward, and
GenericErrorResult was (presumably accidentally) instatiated with
references as the template argument type, e.g. const nsresult&,
which circumvented the check for not calling it with NS_OK in
ResultExtensions.h
Differential Revision: https://phabricator.services.mozilla.com/D90561
In most situations, JSONWriter users already know string lengths (either directly, or through `nsCString` and friends), so we should keep this information through JSONWriter and not recompute it again.
This also allows using JSONWriter with sub-strings (e.g., from a bigger buffer), without having to create null-terminated strings.
Public JSONWriter functions have overloads that accept literal strings.
Differential Revision: https://phabricator.services.mozilla.com/D86192
It seems that the clang toolchain has trouble optimizing away the tag access in
a `mozilla::Variant`. Use of a `CompactPair` seems to be better when `E` is
small (all cases where `UnusedZero<E>` is true are small right now anyway).
While this doesn't change `sizeof(Result<V, E>)` in most cases, it makes
the generated code simpler/smaller: As of now, this reduce the overall VM size
of libxul.so by ca. 59K.
Without additional effort, this requires and leads to default-construction of
a `V` even in cases where it is never accessed, so this is restricted to
trivially default-constructible `V` for now.
This could be avoided by replacing `CompactPair<V, E>` by
`CompactPair<AlignedStorage2<V>, E>`.
Differential Revision: https://phabricator.services.mozilla.com/D88393
It seems that the clang toolchain has trouble optimizing away the tag access in
a `mozilla::Variant`. Use of a `CompactPair` seems to be better when `E` is
small (all cases where `UnusedZero<E>` is true are small right now anyway).
While this doesn't change `sizeof(Result<V, E>)` in most cases, it makes
the generated code simpler/smaller: As of now, this reduce the overall VM size
of libxul.so by ca. 59K.
Without additional effort, this requires and leads to default-construction of
a `V` even in cases where it is never accessed, so this is restricted to
trivially default-constructible `V` for now.
This could be avoided by replacing `CompactPair<V, E>` by
`CompactPair<AlignedStorage2<V>, E>`.
Differential Revision: https://phabricator.services.mozilla.com/D88393
Also, remove the existing uses of Result<const nsCString, nsresult> in URLPreloader
and Result<CryptoScheme, const nsCString> in SampleIterator.
Differential Revision: https://phabricator.services.mozilla.com/D88419
The patch:
- Changes from an explicit capture in MOZ_VALIDATE_AND_GET_HELPER3/MOZ_IS_VALID
to a default capture, to support referencing local variables in conditions.
- Moves things around in Tainting.h and adds comments
- Adds unit tests for the macros
Differential Revision: https://phabricator.services.mozilla.com/D85889
Sean Feng
Nika Layzell
Bogdan Tara
Simon Giesecke
Csoregi Natalia
smolnar
Butkovits Atila
Jan Varga
Mike Hommey
Tooru Fujisawa
Jan de Mooij
Jon Coppeard
Ryan VanderMeulen
Kartik Gautam
Masatoshi Kimura
Cosmin Sabou
Ting-Yu Lin
Alexis Beingessner
Chris Fronk
André Bargull
Gerald Squelart
Andrew McCreight
june wilde
Sylvestre Ledru
Mirko Brodesser
Razvan Maries
Jean-Yves Avenard
Ricky Stewart
Dorel Luca
Christian Holler
Cameron McCormack
Paul Bone
Emilio Cobos Álvarez
Kartikaya Gupta
Jeff Gilbert
Eugen Sawin
Tom Ritter
David Major
Kagami Sascha Rosylight
Nathan Froyd