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Rewrite the style sharing candidate cache.

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The style candidate cache had regressed a few times (see #12534), and my
intuition is that being able to disable all style sharing with a single rule in
the page is really unfortunate.

This commit redesigns the style sharing cache in order to be a optimistic cache,
but then reject candidates if they match different sibling-affecting selectors
in the page, for example.

So far the numbers have improved, but not so much as I'd wanted (~10%/20% of
non-incremental restyling time in general). The current implementation is really
dumb though (we recompute and re-match a lot of stuff), so we should be able to
optimise it quite a bit.

I have different ideas for improving it (that may or may not work), apart of the
low-hanging fruit like don't re-matching candidates all the time but I have to
measure the real impact.

Also, I need to verify it against try.
This commit is contained in:
Emilio Cobos Álvarez 2016-07-29 17:24:12 -07:00
parent ec53136863
commit 3af774bd75
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GPG key ID: 056B727BB9C1027C
23 changed files with 467 additions and 236 deletions
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2
components/script_layout_interface/Cargo.toml
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@ -27,7 +27,7 @@ plugins = {path = "../plugins"}
profile_traits = {path = "../profile_traits"}
range = {path = "../range"}
script_traits = {path = "../script_traits"}
selectors = {version = "0.8", features = ["heap_size"]}
selectors = {version = "0.9", features = ["heap_size"]}
string_cache = {version = "0.2.23", features = ["heap_size"]}
style = {path = "../style"}
url = {version = "1.2", features = ["heap_size"]}