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Don't traverse text nodes during styling.

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MozReview-Commit-ID: 6CtQMxbcLnF
This commit is contained in:
Bobby Holley 2016-10-25 19:50:31 -07:00
parent 1cfd5e8172
commit 1090abae87
7 changed files with 72 additions and 31 deletions
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35
components/layout/traversal.rs
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@ -18,8 +18,10 @@ use style::context::{LocalStyleContext, SharedStyleContext, StyleContext};
use style::data::NodeData;
use style::dom::TNode;
use style::selector_impl::ServoSelectorImpl;
use style::traversal::{DomTraversalContext, recalc_style_at, remove_from_bloom_filter};
use style::traversal::{DomTraversalContext, put_thread_local_bloom_filter};
use style::traversal::{recalc_style_at, remove_from_bloom_filter};
use style::traversal::RestyleResult;
use style::traversal::take_thread_local_bloom_filter;
use util::opts;
use wrapper::{LayoutNodeLayoutData, ThreadSafeLayoutNodeHelpers};
@ -77,7 +79,36 @@ impl<'lc, N> DomTraversalContext<N> for RecalcStyleAndConstructFlows<'lc>
// done by the HTML parser.
node.initialize_data();
recalc_style_at::<_, _, Self>(&self.context, self.root, node)
if node.is_text_node() {
// FIXME(bholley): Stop doing this silly work to maintain broken bloom filter
// invariants.
//
// Longer version: The bloom filter is entirely busted for parallel traversal. Because
// parallel traversal is breadth-first, each sibling rejects the bloom filter set up
// by the previous sibling (which is valid for children, not siblings) and recreates
// it. Similarly, the fixup performed in the bottom-up traversal is useless, because
// threads perform flow construction up the parent chain until they find a parent with
// other unprocessed children, at which point they bail to the work queue and find a
// different node.
//
// Nevertheless, the remove_from_bloom_filter call at the end of flow construction
// asserts that the bloom filter is valid for the current node. This breaks when we
// stop calling recalc_style_at for text nodes, because the recursive chain of
// construct_flows_at calls is no longer necessarily rooted in a call that sets up the
// thread-local bloom filter for the leaf node.
//
// The bloom filter stuff is all going to be rewritten, so we just hackily duplicate
// the bloom filter manipulation from recalc_style_at to maintain invariants.
let parent = node.parent_node();
debug_assert!(parent.unwrap().is_element());
let bf = take_thread_local_bloom_filter(parent, self.root, self.context.shared_context());
put_thread_local_bloom_filter(bf, &node.to_unsafe(), self.context.shared_context());
RestyleResult::Stop
} else {
let el = node.as_element().unwrap();
recalc_style_at::<_, _, Self>(&self.context, self.root, el)
}
}
fn process_postorder(&self, node: N) {