This is needed for bug 1500926. It takes the approach of taking a JSFlatString
and using AutoAssertCannotGC to read the memory directly from the JS heap.
This lets us avoid re-encoding strings when performing lookups, which can be
advantageous.
Only ASCII strings are supported by this handler, and wide strings are hashed
as though they contain only values under 0x7f. This is OK as invalid keys to
perfecthash may return any hashtable entry.
Differential Revision: https://phabricator.services.mozilla.com/D9405
This commit adds a scroll origin, nsGkAtoms::relative, which can be used to
mark main thread scrolling that can be combined with a concurrent APZ scroll.
The behavior of this is controlled by a pref, apz.relative-update. This pref
is initially activated and is intended as an aid to narrowing down causes
of regressions for users in bug reports.
Relative scroll updates work by tracking the last sent or accepted APZ
scroll offset. This is sent along with every FrameMetrics. Additionally,
a flag is added to FrameMetrics, mIsRelative, indicating whether the
scroll offset can be combined with a potential APZ scroll. When this
flag is set, AsyncPanZoomController will apply the delta between the sent
base scroll offset, and sent new scroll offset.
This flag is controlled by the last scroll origin on nsGfxScrollFrame. The
new origin, `relative`, is marked as being able to clobber APZ updates,
but can only be set if all scrolls since the last repaint request or
layers transaction have been relative.
Differential Revision: https://phabricator.services.mozilla.com/D8234
--HG--
extra : rebase_source : 51351a84c9cda228a0975e22eda3fd3bd8d261c4
extra : histedit_source : 4b564c19b16fe2bd26adc671b62b7cb6106e8163
Specifically:
- nsICSSAnonBoxPseudo --> nsCSSAnonBoxPseudoStaticAtom
- nsICSSPseudoElement --> nsCSSPseudoElementStaticAtom
The `nsI` prefix isn't necessary because these are no longer XPIDL types, and
the `StaticAtom` suffix makes their meaning clearer.
--HG--
extra : rebase_source : b68dd7c73f5036dcd6be4c3700b757441f59f9f2
This saves one word per static atom, per process.
The `nsGkAtoms` change is only a small part of this commit.
In regen_atoms.py:
- There is now only one link name per platform: nsGkAtoms::sAtoms[].
- But there is a new constant per atom, giving the index into
nsGkAtoms::sAtoms[].
- And the `atom!` macro for each atom indexes into nsGkAtoms::sAtoms[] using
the index constant.
- A couple of `*mut` pointers are now `*const`.
Elsewhere, the `(nsStaticAtom*)` casts within the `AppendElement()` calls are
necessary to avoid link errors, presumably due to some template instantiation
wrinkle.
--HG--
extra : rebase_source : 629642e708c8bc6e27d6057beae5f35955fdd837
If class A is derived from class B, then an instance of class A can be
converted to B via a static cast, so a slower QI is not needed.
Differential Revision: https://phabricator.services.mozilla.com/D6861
--HG--
extra : moz-landing-system : lando
Presumably the commit that introduced `aStringOffset` could have removed this,
but overlooked it.
--HG--
extra : rebase_source : 176f14ce01c18ed4c83892d2b7a9e7a54fb5c836
Static atom registration is a bit of a mess. NS_InitAtomTable() calls
nsGkAtoms::RegisterStaticAtoms(), which calls NS_RegisterStaticAtoms(); i.e. we
go from nsAtomTable.cpp to nsGkAtoms.cpp and back.
(And NS_RegisterStaticAtoms() is declared in a .cpp file, not a .h file!)
This commit makes NS_InitAtomTable() a friend of nsGkAtoms, so NS_InitAtomTable
can see nsGkAtoms's atoms array directly, thus removing the need for
NS_RegisterAtomTable() and nsGkAtoms::RegisterStaticAtoms().
This commit also removes an out-of-date part of a comment from XPCOMInit.cpp.
--HG--
extra : rebase_source : 7e1f9aa0a9f7cb5088159fe4c953948b931f6d68
nsGkAtoms.h has a big comment explaining how static atom definitions get
expanded by macros. This comment was very useful when there were multiple
sources of static atoms and their definitions used macros a lot. But bug
1482782 combined all the static atom sources into nsGkAtoms and removed a lot
of macro use. So now the comment is now something of a hindrance, duplicating
quite a bit of the code (and not entirely accurately).
This commit removes the big comment, and moves the still-useful parts inline
with the code. This makes things much easier to follow.
This commit also reformats some of the remaining macros so they are easier to
read.
--HG--
extra : rebase_source : 4377be2fa0edc4ea1f592985ded89acbb76fb104
Replace mozilla.widget.use-argb-visuals pref by -moz-gtk-csd-transparent-background media query at browser.css
to draw transparent background. The media query is set by toolkit code and enabled when compatible
window manager is detected.
Differential Revision: https://phabricator.services.mozilla.com/D6658
--HG--
extra : moz-landing-system : lando
Everything that goes in a PLDHashtable (and its derivatives, like
nsTHashtable) needs to inherit from PLDHashEntryHdr. But through a lack
of enforcement, copy constructors for these derived classes didn't
explicitly invoke the copy constructor for PLDHashEntryHdr (and the
compiler didn't invoke the copy constructor for us). Instead,
PLDHashTable explicitly copied around the bits that the copy constructor
would have.
The current setup has two problems:
1) Derived classes should be using move construction, not copy
construction, since anything that's shuffling hash table keys/entries
around will be using move construction.
2) Derived classes should take responsibility for transferring bits of
superclass state around, and not rely on something else to handle that.
The second point is not a huge problem for PLDHashTable (PLDHashTable
only has to copy PLDHashEntryHdr's bits in a single place), but future
hash table implementations that might move entries around more
aggressively would have to insert compensation code all over the
place. Additionally, if moving entries is implemented via memcpy (which
is quite common), PLDHashTable copying around bits *again* is
inefficient.
Let's fix all these problems in one go, by:
1) Explicitly declaring the set of constructors that PLDHashEntryHdr
implements (and does not implement). In particular, the copy
constructor is deleted, so any derived classes that attempt to make
themselves copyable will be detected at compile time: the compiler
will complain that the superclass type is not copyable.
This change on its own will result in many compiler errors, so...
2) Change any derived classes to implement move constructors instead of
copy constructors. Note that some of these move constructors are,
strictly speaking, unnecessary, since the relevant classes are moved
via memcpy in nsTHashtable and its derivatives.
This switches over the few remaining usages of the deprecated
BeginWriting/EndWriting(iterator&) functions to the more standard
BeginWriting/EndWriting() functions.
--HG--
extra : rebase_source : 3c54621d4921eb45157ec4edce0b693bdd7f02d5
This adds a most recently used cache that can be used as a quick lookup table
for frequently used entries.
--HG--
extra : rebase_source : 571c32f75e985e299113f73b959809d208aad5f3
* Avoid the string implementation's capacity checks, since we know they
succeed.
* Avoid the string implementation's aliasing checks, since we know there's no
aliasing.
* Avoid writing the zero terminator more than once or out of sequence.
* Use u"" literals when appending literals to a UTF-16 string.
* Write runs of non-escaped code units instead of writing code unit by code
unit in order to benefit from SIMD (either via memcpy or
ConvertLatin1toUTF16).
This results in a 13% execution time reduction on desktop Haswell i7 when
getting the innerHTML of the body of the Selectors spec. (The WebKit
optimization target from https://bugs.webkit.org/show_bug.cgi?id=81214 .)
MozReview-Commit-ID: LAg3gkGJnpQ
Differential Revision: https://phabricator.services.mozilla.com/D5239
--HG--
extra : moz-landing-system : lando
