Currently static atoms are stored on the heap, but their char buffers are
stored in read-only static memory.
This patch changes the representation of nsStaticAtom (thus making it a
non-trivial subclass of nsAtom). Instead of a pointer to the string, it now has
an mStringOffset field which is a 32-bit offset to the string. (This requires
placement of the string and the atom within the same object so that the offset
is known to be small. The docs and macros in nsStaticAtom.h handle that.)
Static and dynamic atoms now store their chars in different ways: nsStaticAtom
stores them inline, nsDynamicAtom has a pointer to separate storage. So
`mString` and GetStringBuffer() move from nsAtom to nsDynamicAtom.
The change to static atoms means they can be made constexpr and stored in
read-only memory instead of on the heap. On 64-bit this reduces the per-process
overhead by 16 bytes; on 32-bit the saving is 12 bytes. (Further reductions
will be possible in follow-up patches.)
The increased use of constexpr required multiple workarounds for MSVC.
- Multiple uses of MOZ_{PUSH,POP}_DISABLE_INTEGRAL_CONSTANT_OVERFLOW_WARNING to
disable warnings about (well-defined!) overflow of unsigned integer
arithmetic.
- The use of -Zc:externConstexpr on all files defining static atoms, to make
MSVC follow the C++ standard(!) and let constexpr variables have external
linkage.
- The use of -constexpr:steps300000 to increase the number of operations
allowed in a constexpr value, in order to handle gGkAtoms, which requires
hashing ~2,500 atom strings.
The patch also changes how HTML5 atoms are handled. They are now treated as
dynamic atoms, i.e. we have "dynamic normal" atoms and "dynamic HTML5 atoms",
and "dynamic atoms" covers both cases, and both are represented via
nsDynamicAtom. The main difference between the two kinds is that dynamic HTML5
atoms still aren't allowed to be used in various operations, most notably
AddRef()/Release(). All this also required moving nsDynamicAtom into the header
file.
There is a slight performance cost to all these changes: now that nsStaticAtom
and nsDynamicAtom store their chars in different ways, a conditional branch is
required in the following functions: Equals(), GetUTF16String(),
WeakAtom::as_slice().
Finally, in about:memory the "explicit/atoms/static/atom-objects" value is no
longer needed, because that memory is static instead of heap-allocated.
MozReview-Commit-ID: 4AxPv05ngZy
<!-- Please describe your changes on the following line: -->
This is the Servo part of bug 1411469.
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix Mozilla bug 1411469
<!-- Either: -->
- [ ] There are tests for these changes OR
- [X] These changes do not require tests because tests are on the Gecko side.
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r? @emilio
Source-Repo: https://github.com/servo/servo
Source-Revision: 10813436b36323711430ab56fad83234029c9f96
--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 26652a48385035c413b0290768cbefee37b765e9
nsStyleStructList.h was initially made generated in bug 873368 to avoid
manually maintaining boilerplate for if-dispatch, while the if-dispatch
was replaced by jump table in bug 1171842, so the boilerplate went away.
However, in bug 1122781 (before bug 1171842), boilerplate for dependency
check, so it still needs to be generated.
The dependency table is removed in the previous patch, so we no longer
have any boilerplate in the style struct list, and thus it doesn't need
to be generated anymore.
MozReview-Commit-ID: GkbJZ98ojbE
--HG--
extra : rebase_source : a148b97c051bb6c88846cf6ba617c4edef70ca24
extra : source : f1c7d19cde195fb90ac2627d16ed69d020de01b9
nsBaseWidget::BoundsUseDesktopPixels() states that window types before
eWindowType_popup take desktop pixels rather than device pixels for
parameters of Move and Resize.
Cocoa widget seems to treat all of them as desktop pixels, and sheet is
one of the window types that it can actually open, so it should be put
before popup so that BoundsUseDesktopPixels() is correct on that.
MozReview-Commit-ID: FPqOoUQlQCy
--HG--
extra : source : 1d1f62a81d9fc059af9038eebc64256aeba397d3
OSX jittests have been running as a no-op for a while, due to a mozharness mis-configuration.
This fixes the configuration so that the test suite actually runs.
This is deprecated and there are no consumers that use
IndexedDB.jsm with the storage option.
--HG--
extra : rebase_source : ebf55265affe5d01c1934de5593de420b5405033
<!-- Please describe your changes on the following line: -->
Complementary to https://github.com/servo/rust-mozjs/pull/404.
Removing `Heap::handle_mut` didn't warrant any changes on Servo side, and so the changes here are only to fix compilation with `Heap::handle` being now marked as `unsafe`.
The main idea is that we can't hand out handles to heap values themselves, since they're not guaranteed to be rooted, but it's safe to do when we are - hence why the safe impl on `RootedTraceableBox<Heap<T>>` and why it's safe to use inside structs that hold a Heap and are `#[must_root]`.
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).
<!-- Either: -->
- [ ] There are tests for these changes OR
- [X] These changes do not require tests because the compiler forces correctness here.
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<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
Source-Repo: https://github.com/servo/servo
Source-Revision: 18ef5874dd3e11551e2f9503746540847eeb974c
--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 51f863c54f4fa1d159691fea3ae5b9ff76e004b9
The old style system used FlattenedTreeIterator for lazy frame construction.
That could not find native anonymous nodes, so we had to construct eagerly in
native anonymous subtrees. Servo uses StyleChildrenIterator for the same
purpose, and that knows about native anonymous content, so we can now do lazy
construction for it.
Also, not check the container to do lazyFC on the children, it's no longer
necessary to check for anon content, and the reason we check for XUL is because
of XBL bindings, and those are loaded for the parent already, if we're about to
construct frames for the children.
Also, assert more tightly, we don't insert NAC lazily, that makes no sense.
Well, to be fair editor does insert anonymous nodes lazily sometimes (see al the
ManualNAC machinery), but it goes through the PostRecreateFramesFor path, not
through ContentInserted / LazyFC.
MozReview-Commit-ID: 2TmRNgpWaM
Summary:
I can propagate the error up if needed, but looks like the code should cope with
it just fine with this change.
Reviewers: kats
Bug #: 1446108
Differential Revision: https://phabricator.services.mozilla.com/D794
MozReview-Commit-ID: Dm6EKIC6F5i
A typo meant we were checking the address of mChildCount, not the value.
MozReview-Commit-ID: 7Hit3FBy9pr
--HG--
extra : amend_source : edb85b8e73184e47cd9ff42c0442f89d5f3c5152
Jean-Yves Avenard
Andrea Marchesini
Boris Zbarsky
Csoregi Natalia
Masatoshi Kimura
Emilio Cobos Álvarez
Nicholas Nethercote
Xidorn Quan
Gurzau Raul
L. David Baron
Geoff Brown
Johann Hofmann
Mike Conley
Andi-Bogdan Postelnicu
Coroiu Cristina
ffxbld
Ursula Sarracini
Igor Matuszewski
Brindusan Cristian
Cosmin Sabou
Jan de Mooij
Narcis Beleuzu
Margareta Eliza Balazs
Yuki Hiroshi
James Teh
J.C. Jones
André Bargull