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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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23 changed files with 467 additions and 236 deletions
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6
ports/geckolib/traversal.rs
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@ -4,7 +4,7 @@
use context::StandaloneStyleContext;
use std::mem;
use style::context::SharedStyleContext;
use style::context::{LocalStyleContext, SharedStyleContext, StyleContext};
use style::dom::OpaqueNode;
use style::traversal::RestyleResult;
use style::traversal::{DomTraversalContext, recalc_style_at};
@ -42,4 +42,8 @@ impl<'lc, 'ln> DomTraversalContext<GeckoNode<'ln>> for RecalcStyleOnly<'lc> {
/// We don't use the post-order traversal for anything.
fn needs_postorder_traversal(&self) -> bool { false }
fn local_context(&self) -> &LocalStyleContext {
self.context.local_context()
}
}