Correctness improvements:
* UTF errors are handled safely per spec instead of dangerously truncating
strings.
* There are fewer converter implementations.
Performance improvements:
* The old code did exact buffer length math, which meant doing UTF math twice
on each input string (once for length calculation and another time for
conversion). Exact length math is more complicated when handling errors
properly, which the old code didn't do. The new code does UTF math on the
string content only once (when converting) but risks allocating more than
once. There are heuristics in place to lower the probability of
reallocation in cases where the double math avoidance isn't enough of a
saving to absorb an allocation and memcpy.
* Previously, in UTF-16 <-> UTF-8 conversions, an ASCII prefix was optimized
but a single non-ASCII code point pessimized the rest of the string. The
new code tries to get back on the fast ASCII path.
* UTF-16 to Latin1 conversion guarantees less about handling of out-of-range
input to eliminate an operation from the inner loop on x86/x86_64.
* When assigning to a pre-existing string, the new code tries to reuse the
old buffer instead of first releasing the old buffer and then allocating a
new one.
* When reallocating from the new code, the memcpy covers only the data that
is part of the logical length of the old string instead of memcpying the
whole capacity. (For old callers old excess memcpy behavior is preserved
due to bogus callers. See bug 1472113.)
* UTF-8 strings in XPConnect that are in the Latin1 range are passed to
SpiderMonkey as Latin1.
New features:
* Conversion between UTF-8 and Latin1 is added in order to enable faster
future interop between Rust code (or otherwise UTF-8-using code) and text
node and SpiderMonkey code that uses Latin1.
MozReview-Commit-ID: JaJuExfILM9
1. We will add more shape-like types in the future, so it's better to
use union to reduce the memory usage.
2. Those shape-like types are mutual exclusive, so we could use union to
wrap them.
Differential Revision: https://phabricator.services.mozilla.com/D2746
--HG--
extra : moz-landing-system : lando
It used to be this way because of lifetime issues (plus the shadow
datas were in RwLocks at some point IIRC). Now we guarantee that as long as the
element is away the cascade data is as well, so we don't need to thread it
around.
Differential Revision: https://phabricator.services.mozilla.com/D2768
--HG--
extra : moz-landing-system : lando
We only have this so that ::-moz-placeholder keeps serializing as
::-moz-placeholder, but I don't think anybody really cares.
Edge aliases ::-webkit-input-placeholder to ::-ms-input-placeholder at parse
time as well, as can be seen in:
```
let s = document.createElement('style');
s.innerHTML = `input::-webkit-input-placeholder { color: red };`;
document.body.appendChild(s);
document.body.innerHTML = s.sheet.cssRules[0].cssText;
```
And I think this is more consistent with what we do for CSS properties that are
aliases.
Differential Revision: https://phabricator.services.mozilla.com/D2595
MozReview-Commit-ID: 3ImDWamJhxh
This saves about 37 KiB of memory across the UA style sheets.
MozReview-Commit-ID: EoZnlmyWwxX
--HG--
extra : rebase_source : cd8ef0ba838618f9a4583b7d9896caa3a0602199
The '-moz-menulist-button' value currently behavies identically to the
'menulist-button' value. This is not implemented as an alias because later
patches in this patch series will change the behavior of our pre-existing
'menulist-button' value to more closely match what Chrome does.
The '-moz-menulist-button' value currently behavies identically to the
'menulist-button' value. This is not implemented as an alias because later
patches in this patch series will change the behavior of our pre-existing
'menulist-button' value to more closely match what Chrome does.
--HG--
extra : rebase_source : b66bf6427db5be2eb12f4e0aa36d22a4da46555a
Always assume allowed-for-all-content. There are a couple callers which weren't
doing that:
* A unit test -> removed.
* ComputeAnimationDistance: Used for testing (in transitions_per_property), and
for the animation inspector. The animation inspector shouldn't show
non-enabled properties. The transitions_per_property test already relies on
getComputedStyle stuff which only uses eForAllContent.
* GetCSSImageURLs: I added this API for the context menu page and such. It
doesn't rely on non-enabled-everywhere properties, it was only using
eInChrome because it was a ChromeOnly API, but it doesn't really need this.
Differential Revision: https://phabricator.services.mozilla.com/D2514
MozReview-Commit-ID: 4VOi5Su3Bos
And general Element logging. We now print all the attributes for comparison.
If this turns out to be too verbose we can change it to diff them or something.
Differential Revision: https://phabricator.services.mozilla.com/D2471
MozReview-Commit-ID: 1Gl9AumdnvZ
:root can't change without getting unbound from the tree so no fancy stuff other
than that needed.
This removes a lot of revalidation and attribute invalidation matching from the
Chrome, and looks like it should be a good idea in general.
Differential Revision: https://phabricator.services.mozilla.com/D2462
MozReview-Commit-ID: 9B0EO9teczi
We have a different order in nsCSSPropertyId for no good reason. The only
invariant there is that longhands come before shorthands, and shorthands before
aliases.
Luckily that's also an invariant that NonCustomPropertyId has, so we can reuse
them.
Differential Revision: https://phabricator.services.mozilla.com/D2463
MozReview-Commit-ID: 1hsQu6hmqiN
The patch at bug 1478391 comment 6 changed the way the math in Scrollbarbutton*
worked, which pretty surely caused this.
Restore the original order and math to be the same as before bug 1478391.
MozReview-Commit-ID: CK3iOqeX2NW
