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Move match and cascade temporaries to CurrentElementInfo

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Before this change, the `ComputedStyle` struct that is part of permanent style
data per element holds 2 `StrongRuleNode`s (unvisited and visited) and 2
`Arc<ComputedValues>` (unvisited and visited).

Both rule nodes and the visited values don't actually need to be here.  This
patch moves these 3 to new temporary storage in `CascadeInputs` on
`CurrentElementInfo` during the match and cascade process.  Rule nodes are
pushed down inside the `ComputedValues` for later access after the cascade.
(Visited values were already available there.)

The permanent style data per element now has just the `Arc<ComputedValues>` for
itself and eager pseudo-elements (plus the `RestyleHint`).

MozReview-Commit-ID: 3wq52ERMpdi
This commit is contained in:
J. Ryan Stinnett 2017-06-13 12:51:37 -05:00
parent c3b2a2f4de
commit 2b5c56e6a8
19 changed files with 738 additions and 746 deletions
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34
components/style/traversal.rs
View file

@ -5,7 +5,7 @@
//! Traversing the DOM tree; the bloom filter.
use atomic_refcell::AtomicRefCell;
use context::{SharedStyleContext, StyleContext, ThreadLocalStyleContext};
use context::{ElementCascadeInputs, StyleContext, SharedStyleContext, ThreadLocalStyleContext};
use data::{ElementData, ElementStyles};
use dom::{DirtyDescendants, NodeInfo, OpaqueNode, TElement, TNode};
use invalidation::element::restyle_hints::{RECASCADE_SELF, RECASCADE_DESCENDANTS, RestyleHint};
@ -228,7 +228,7 @@ pub trait DomTraversal<E: TElement> : Sync {
"must not specify FOR_RECONSTRUCT in combination with UNSTYLED_CHILDREN_ONLY");
if traversal_flags.for_unstyled_children_only() {
if root.borrow_data().map_or(true, |d| d.has_styles() && d.styles().is_display_none()) {
if root.borrow_data().map_or(true, |d| d.has_styles() && d.styles.is_display_none()) {
return PreTraverseToken {
traverse: false,
unstyled_children_only: false,
@ -303,7 +303,7 @@ pub trait DomTraversal<E: TElement> : Sync {
if pseudo.is_before_or_after() {
is_before_or_after_pseudo = true;
let still_match =
parent_data.styles().pseudos.get(&pseudo).is_some();
parent_data.styles.pseudos.get(&pseudo).is_some();
if !still_match {
debug_assert!(going_to_reframe,
@ -404,7 +404,7 @@ pub trait DomTraversal<E: TElement> : Sync {
debug_assert!(cfg!(feature = "gecko") || parent.has_current_styles(parent_data));
// If the parent computed display:none, we don't style the subtree.
if parent_data.styles().is_display_none() {
if parent_data.styles.is_display_none() {
if log.allow() { debug!("Parent {:?} is display:none, culling traversal", parent); }
return false;
}
@ -431,7 +431,7 @@ pub trait DomTraversal<E: TElement> : Sync {
// recursively drops Servo ElementData when the XBL insertion parent of
// an Element is changed.
if cfg!(feature = "gecko") && thread_local.is_initial_style() &&
parent_data.styles().primary.values().has_moz_binding() {
parent_data.styles.primary().has_moz_binding() {
if log.allow() { debug!("Parent {:?} has XBL binding, deferring traversal", parent); }
return false;
}
@ -515,7 +515,7 @@ fn resolve_style_internal<E, F>(context: &mut StyleContext<E>,
let mut display_none_root = None;
// If the Element isn't styled, we need to compute its style.
if data.get_styles().is_none() {
if !data.has_styles() {
// Compute the parent style if necessary.
let parent = element.traversal_parent();
if let Some(p) = parent {
@ -549,7 +549,7 @@ fn resolve_style_internal<E, F>(context: &mut StyleContext<E>,
// If we're display:none and none of our ancestors are, we're the root
// of a display:none subtree.
if display_none_root.is_none() && data.styles().is_display_none() {
if display_none_root.is_none() && data.styles.is_display_none() {
display_none_root = Some(element);
}
@ -576,7 +576,7 @@ pub fn resolve_style<E, F, G, H>(context: &mut StyleContext<E>, element: E,
// Make them available for the scope of the callback. The callee may use the
// argument, or perform any other processing that requires the styles to exist
// on the Element.
callback(element.borrow_data().unwrap().styles());
callback(&element.borrow_data().unwrap().styles);
// Clear any styles in display:none subtrees or subtrees not in the document,
// to leave the tree in a valid state. For display:none subtrees, we leave
@ -635,7 +635,7 @@ pub fn resolve_default_style<E, F, G, H>(context: &mut StyleContext<E>,
// Make them available for the scope of the callback. The callee may use the
// argument, or perform any other processing that requires the styles to exist
// on the Element.
callback(element.borrow_data().unwrap().styles());
callback(&element.borrow_data().unwrap().styles);
// Swap the old element data back into the element and its ancestors.
for entry in old_data {
@ -685,7 +685,7 @@ pub fn recalc_style_at<E, D>(traversal: &D,
// If we're restyling this element to display:none, throw away all style
// data in the subtree, notify the caller to early-return.
if data.styles().is_display_none() {
if data.styles.is_display_none() {
debug!("{:?} style is display:none - clearing data from descendants.",
element);
clear_descendant_data(element, &|e| unsafe { D::clear_element_data(&e) });
@ -709,7 +709,7 @@ pub fn recalc_style_at<E, D>(traversal: &D,
trace!("propagated_hint={:?} \
is_display_none={:?}, implementing_pseudo={:?}",
propagated_hint,
data.styles().is_display_none(),
data.styles.is_display_none(),
element.implemented_pseudo_element());
debug_assert!(element.has_current_styles(data) ||
context.shared.traversal_flags.for_animation_only(),
@ -769,7 +769,7 @@ pub fn recalc_style_at<E, D>(traversal: &D,
// The second case is when we are in a restyle for reconstruction,
// where we won't need to perform a post-traversal to pick up any
// change hints.
if data.styles().is_display_none() ||
if data.styles.is_display_none() ||
context.shared.traversal_flags.for_reconstruct() {
unsafe { element.unset_dirty_descendants(); }
}
@ -829,7 +829,11 @@ fn compute_style<E, D>(_traversal: &D,
)
}
CascadeWithReplacements(flags) => {
let important_rules_changed = element.replace_rules(flags, context, data);
// Skipping full matching, load cascade inputs from previous values.
context.thread_local.current_element_info
.as_mut().unwrap()
.cascade_inputs = ElementCascadeInputs::new_from_element_data(data);
let important_rules_changed = element.replace_rules(flags, context);
element.cascade_primary_and_pseudos(
context,
data,
@ -837,6 +841,10 @@ fn compute_style<E, D>(_traversal: &D,
)
}
CascadeOnly => {
// Skipping full matching, load cascade inputs from previous values.
context.thread_local.current_element_info
.as_mut().unwrap()
.cascade_inputs = ElementCascadeInputs::new_from_element_data(data);
element.cascade_primary_and_pseudos(
context,
data,