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style: Factor out per-origin data storage.

Browse source 
Also add an iter_mut_origins() function.
This commit is contained in:
Cameron McCormack 2017-08-12 13:40:44 +08:00
parent 0635fddbfc
commit 321643ae61
5 changed files with 207 additions and 213 deletions
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4
components/layout_thread/lib.rs
View file

@ -137,7 +137,7 @@ use style::selector_parser::SnapshotMap;
use style::servo::restyle_damage::{REFLOW, REFLOW_OUT_OF_FLOW, REPAINT, REPOSITION, STORE_OVERFLOW};
use style::shared_lock::{SharedRwLock, SharedRwLockReadGuard, StylesheetGuards};
use style::stylesheets::{Origin, Stylesheet, StylesheetInDocument, UserAgentStylesheets};
use style::stylist::{ExtraStyleData, Stylist};
use style::stylist::Stylist;
use style::thread_state;
use style::timer::Timer;
use style::traversal::{DomTraversal, TraversalDriver};
@ -1206,7 +1206,7 @@ impl LayoutThread {
author: &author_guard,
ua_or_user: &ua_or_user_guard,
};
let mut extra_data = ExtraStyleData;
let mut extra_data = Default::default();
let needs_dirtying = self.stylist.update(
StylesheetIterator(data.document_stylesheets.iter()),
&guards,

4
components/style/gecko/data.rs
View file

@ -17,7 +17,7 @@ use properties::ComputedValues;
use servo_arc::Arc;
use shared_lock::{Locked, StylesheetGuards, SharedRwLockReadGuard};
use stylesheet_set::StylesheetSet;
use stylesheets::{StylesheetContents, StylesheetInDocument};
use stylesheets::{PerOrigin, StylesheetContents, StylesheetInDocument};
use stylist::{ExtraStyleData, Stylist};
/// Little wrapper to a Gecko style sheet.
@ -118,7 +118,7 @@ pub struct PerDocumentStyleDataImpl {
pub stylesheets: StylesheetSet<GeckoStyleSheet>,
/// List of effective @font-face and @counter-style rules.
pub extra_style_data: ExtraStyleData,
pub extra_style_data: PerOrigin<ExtraStyleData>,
}
/// The data itself is an `AtomicRefCell`, which guarantees the proper semantics

2
components/style/stylesheets/mod.rs
View file

@ -44,7 +44,7 @@ pub use self::memory::{MallocSizeOf, MallocSizeOfFn, MallocSizeOfWithGuard};
#[cfg(feature = "gecko")]
pub use self::memory::{MallocSizeOfWithRepeats, SizeOfState};
pub use self::namespace_rule::NamespaceRule;
pub use self::origin::Origin;
pub use self::origin::{Origin, PerOrigin, PerOriginClear};
pub use self::page_rule::PageRule;
pub use self::rule_parser::{State, TopLevelRuleParser};
pub use self::rule_list::{CssRules, CssRulesHelpers};

125
components/style/stylesheets/origin.rs
View file

@ -4,6 +4,9 @@
///! [CSS cascade origins](https://drafts.csswg.org/css-cascade/#cascading-origins).
use std::marker::PhantomData;
use std::mem::transmute;
/// Each style rule has an origin, which determines where it enters the cascade.
///
/// https://drafts.csswg.org/css-cascade/#cascading-origins
@ -19,3 +22,125 @@ pub enum Origin {
/// https://drafts.csswg.org/css-cascade/#cascade-origin-user
User,
}
/// An object that stores a `T` for each origin of the CSS cascade.
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
#[derive(Debug, Default)]
pub struct PerOrigin<T> {
/// Data for `Origin::UserAgent`.
pub user_agent: T,
/// Data for `Origin::Author`.
pub author: T,
/// Data for `Origin::User`.
pub user: T,
}
impl<T> PerOrigin<T> {
/// Returns a reference to the per-origin data for the specified origin.
#[inline]
pub fn borrow_for_origin(&self, origin: &Origin) -> &T {
match *origin {
Origin::UserAgent => &self.user_agent,
Origin::Author => &self.author,
Origin::User => &self.user,
}
}
/// Returns a mutable reference to the per-origin data for the specified
/// origin.
#[inline]
pub fn borrow_mut_for_origin(&mut self, origin: &Origin) -> &mut T {
match *origin {
Origin::UserAgent => &mut self.user_agent,
Origin::Author => &mut self.author,
Origin::User => &mut self.user,
}
}
/// Iterates over references to per-origin extra style data, from highest
/// level (user) to lowest (user agent).
pub fn iter_origins(&self) -> PerOriginIter<T> {
PerOriginIter {
data: &self,
cur: 0,
}
}
/// Iterates over mutable references to per-origin extra style data, from
/// highest level (user) to lowest (user agent).
pub fn iter_mut_origins(&mut self) -> PerOriginIterMut<T> {
PerOriginIterMut {
data: self,
cur: 0,
_marker: PhantomData,
}
}
}
/// An object that can be cleared.
pub trait PerOriginClear {
/// Clears the object.
fn clear(&mut self);
}
impl<T> PerOriginClear for PerOrigin<T> where T: PerOriginClear {
fn clear(&mut self) {
self.user_agent.clear();
self.author.clear();
self.user.clear();
}
}
/// Iterator over `PerOrigin<T>`, from highest level (user) to lowest
/// (user agent).
///
/// We rely on this specific order for correctly looking up @font-face,
/// @counter-style and @keyframes rules.
pub struct PerOriginIter<'a, T: 'a> {
data: &'a PerOrigin<T>,
cur: usize,
}
impl<'a, T> Iterator for PerOriginIter<'a, T> where T: 'a {
type Item = (&'a T, Origin);
fn next(&mut self) -> Option<Self::Item> {
let result = match self.cur {
0 => (&self.data.user, Origin::User),
1 => (&self.data.author, Origin::Author),
2 => (&self.data.user_agent, Origin::UserAgent),
_ => return None,
};
self.cur += 1;
Some(result)
}
}
/// Like `PerOriginIter<T>`, but iterates over mutable references to the
/// per-origin data.
///
/// We must use unsafe code here since it's not possible for the borrow
/// checker to know that we are safely returning a different reference
/// each time from `next()`.
pub struct PerOriginIterMut<'a, T: 'a> {
data: *mut PerOrigin<T>,
cur: usize,
_marker: PhantomData<&'a mut PerOrigin<T>>,
}
impl<'a, T> Iterator for PerOriginIterMut<'a, T> where T: 'a {
type Item = (&'a mut T, Origin);
fn next(&mut self) -> Option<Self::Item> {
let result = match self.cur {
0 => (unsafe { transmute(&mut (*self.data).user) }, Origin::User),
1 => (unsafe { transmute(&mut (*self.data).author) }, Origin::Author),
2 => (unsafe { transmute(&mut (*self.data).user_agent) }, Origin::UserAgent),
_ => return None,
};
self.cur += 1;
Some(result)
}
}

285
components/style/stylist.rs
View file

@ -40,7 +40,8 @@ use style_traits::viewport::ViewportConstraints;
#[cfg(feature = "gecko")]
use stylesheets::{CounterStyleRule, FontFaceRule};
use stylesheets::{CssRule, StyleRule};
use stylesheets::{StylesheetInDocument, Origin, UserAgentStylesheets};
use stylesheets::{StylesheetInDocument, Origin, PerOrigin, PerOriginClear};
use stylesheets::UserAgentStylesheets;
use stylesheets::keyframes_rule::KeyframesAnimation;
use stylesheets::viewport_rule::{self, MaybeNew, ViewportRule};
use thread_state;
@ -90,7 +91,7 @@ pub struct Stylist {
/// Selector maps for all of the style sheets in the stylist, after
/// evalutaing media rules against the current device, split out per
/// cascade level.
cascade_data: CascadeData,
cascade_data: PerOrigin<CascadeData>,
/// The rule tree, that stores the results of selector matching.
rule_tree: RuleTree,
@ -110,90 +111,6 @@ pub struct Stylist {
num_rebuilds: usize,
}
/// This struct holds data which users of Stylist may want to extract
/// from stylesheets which can be done at the same time as updating.
#[cfg(feature = "gecko")]
#[derive(Default)]
pub struct ExtraStyleData {
/// Extra data from user agent stylesheets
user_agent: PerOriginExtraStyleData,
/// Extra data from author stylesheets
author: PerOriginExtraStyleData,
/// Extra data from user stylesheets
user: PerOriginExtraStyleData,
}
/// This struct holds data which users of Stylist may want to extract
/// from stylesheets which can be done at the same time as updating.
#[cfg(feature = "gecko")]
#[derive(Default)]
pub struct PerOriginExtraStyleData {
/// A list of effective font-face rules and their origin.
pub font_faces: Vec<Arc<Locked<FontFaceRule>>>,
/// A map of effective counter-style rules.
pub counter_styles: PrecomputedHashMap<Atom, Arc<Locked<CounterStyleRule>>>,
}
#[cfg(feature = "gecko")]
impl ExtraStyleData {
/// Clear the internal data.
pub fn clear(&mut self) {
self.user_agent.clear();
self.author.clear();
self.user.clear();
}
/// Returns a reference to the per-origin extra style data for
/// the specified origin.
#[inline]
pub fn borrow_mut_for_origin(&mut self, origin: &Origin) -> &mut PerOriginExtraStyleData {
match *origin {
Origin::UserAgent => &mut self.user_agent,
Origin::Author => &mut self.author,
Origin::User => &mut self.user,
}
}
/// Iterates over the per-origin extra style data, from highest level (user)
/// to lowest (user agent).
pub fn iter_origins(&self) -> ExtraStyleDataIter {
ExtraStyleDataIter {
extra_style_data: &self,
cur: 0,
}
}
}
#[cfg(feature = "gecko")]
impl PerOriginExtraStyleData {
/// Clears the stored @font-face and @counter-style rules.
fn clear(&mut self) {
self.font_faces.clear();
self.counter_styles.clear();
}
/// Add the given @font-face rule.
fn add_font_face(&mut self, rule: &Arc<Locked<FontFaceRule>>) {
self.font_faces.push(rule.clone());
}
/// Add the given @counter-style rule.
fn add_counter_style(&mut self, guard: &SharedRwLockReadGuard,
rule: &Arc<Locked<CounterStyleRule>>) {
let name = rule.read_with(guard).mName.raw::<nsIAtom>().into();
self.counter_styles.insert(name, rule.clone());
}
}
#[allow(missing_docs)]
#[cfg(feature = "servo")]
pub struct ExtraStyleData;
#[cfg(feature = "servo")]
impl ExtraStyleData {
fn clear(&mut self) {}
}
/// What cascade levels to include when styling elements.
#[derive(Copy, Clone, PartialEq)]
pub enum RuleInclusion {
@ -229,7 +146,7 @@ impl Stylist {
quirks_mode: quirks_mode,
effective_media_query_results: EffectiveMediaQueryResults::new(),
cascade_data: CascadeData::new(),
cascade_data: Default::default(),
precomputed_pseudo_element_decls: PerPseudoElementMap::default(),
rules_source_order: 0,
rule_tree: RuleTree::new(),
@ -241,12 +158,12 @@ impl Stylist {
/// Returns the number of selectors.
pub fn num_selectors(&self) -> usize {
self.cascade_data.iter_origins().map(|d| d.num_selectors).sum()
self.cascade_data.iter_origins().map(|(d, _)| d.num_selectors).sum()
}
/// Returns the number of declarations.
pub fn num_declarations(&self) -> usize {
self.cascade_data.iter_origins().map(|d| d.num_declarations).sum()
self.cascade_data.iter_origins().map(|(d, _)| d.num_declarations).sum()
}
/// Returns the number of times the stylist has been rebuilt.
@ -257,13 +174,13 @@ impl Stylist {
/// Returns the number of revalidation_selectors.
pub fn num_revalidation_selectors(&self) -> usize {
self.cascade_data.iter_origins()
.map(|d| d.selectors_for_cache_revalidation.len()).sum()
.map(|(d, _)| d.selectors_for_cache_revalidation.len()).sum()
}
/// Returns the number of entries in invalidation maps.
pub fn num_invalidations(&self) -> usize {
self.cascade_data.iter_origins()
.map(|d| d.invalidation_map.len()).sum()
.map(|(d, _)| d.invalidation_map.len()).sum()
}
/// Invokes `f` with the `InvalidationMap` for each origin.
@ -274,8 +191,8 @@ impl Stylist {
pub fn each_invalidation_map<F>(&self, mut f: F)
where F: FnMut(&InvalidationMap)
{
for origin_cascade_data in self.cascade_data.iter_origins() {
f(&origin_cascade_data.invalidation_map)
for (data, _) in self.cascade_data.iter_origins() {
f(&data.invalidation_map)
}
}
@ -324,7 +241,7 @@ impl Stylist {
ua_stylesheets: Option<&UserAgentStylesheets>,
stylesheets_changed: bool,
author_style_disabled: bool,
extra_data: &mut ExtraStyleData
extra_data: &mut PerOrigin<ExtraStyleData>
) -> bool
where
I: Iterator<Item = &'a S> + Clone,
@ -404,7 +321,7 @@ impl Stylist {
ua_stylesheets: Option<&UserAgentStylesheets>,
stylesheets_changed: bool,
author_style_disabled: bool,
extra_data: &mut ExtraStyleData
extra_data: &mut PerOrigin<ExtraStyleData>
) -> bool
where
I: Iterator<Item = &'a S> + Clone,
@ -426,7 +343,7 @@ impl Stylist {
&mut self,
stylesheet: &S,
guard: &SharedRwLockReadGuard,
_extra_data: &mut ExtraStyleData
_extra_data: &mut PerOrigin<ExtraStyleData>
)
where
S: StylesheetInDocument + ToMediaListKey + 'static,
@ -574,11 +491,11 @@ impl Stylist {
} else if *local_name == local_name!("style") {
self.cascade_data
.iter_origins()
.any(|d| d.style_attribute_dependency)
.any(|(d, _)| d.style_attribute_dependency)
} else {
self.cascade_data
.iter_origins()
.any(|d| {
.any(|(d, _)| {
d.attribute_dependencies
.might_contain_hash(local_name.get_hash())
})
@ -602,7 +519,7 @@ impl Stylist {
pub fn has_state_dependency(&self, state: ElementState) -> bool {
self.cascade_data
.iter_origins()
.any(|d| d.state_dependencies.intersects(state))
.any(|(d, _)| d.state_dependencies.intersects(state))
}
/// Computes the style for a given "precomputed" pseudo-element, taking the
@ -852,6 +769,12 @@ impl Stylist {
self.quirks_mode)
}
fn has_rules_for_pseudo(&self, pseudo: &PseudoElement) -> bool {
self.cascade_data
.iter_origins()
.any(|(d, _)| d.has_rules_for_pseudo(pseudo))
}
/// Computes the cascade inputs for a lazily-cascaded pseudo-element.
///
/// See the documentation on lazy pseudo-elements in
@ -868,7 +791,7 @@ impl Stylist {
let pseudo = pseudo.canonical();
debug_assert!(pseudo.is_lazy());
if !self.cascade_data.has_rules_for_pseudo(&pseudo) {
if !self.has_rules_for_pseudo(&pseudo) {
return CascadeInputs::default()
}
@ -1324,7 +1247,7 @@ impl Stylist {
pub fn may_have_rules_for_id(&self, id: &Atom) -> bool {
self.cascade_data
.iter_origins()
.any(|d| d.mapped_ids.might_contain_hash(id.get_hash()))
.any(|(d, _)| d.mapped_ids.might_contain_hash(id.get_hash()))
}
/// Return whether the device is dirty, that is, whether the screen size or
@ -1339,7 +1262,7 @@ impl Stylist {
pub fn get_animation(&self, name: &Atom) -> Option<&KeyframesAnimation> {
self.cascade_data
.iter_origins()
.filter_map(|d| d.animations.get(name))
.filter_map(|(d, _)| d.animations.get(name))
.next()
}
@ -1364,8 +1287,8 @@ impl Stylist {
// the lookups, which means that the bitvecs are comparable. We verify
// this in the caller by asserting that the bitvecs are same-length.
let mut results = BitVec::new();
for origin_cascade_data in self.cascade_data.iter_origins() {
origin_cascade_data.selectors_for_cache_revalidation.lookup(
for (data, _) in self.cascade_data.iter_origins() {
data.selectors_for_cache_revalidation.lookup(
*element, self.quirks_mode, &mut |selector_and_hashes| {
results.push(matches_selector(&selector_and_hashes.selector,
selector_and_hashes.selector_offset,
@ -1431,6 +1354,44 @@ impl Stylist {
}
}
/// This struct holds data which users of Stylist may want to extract
/// from stylesheets which can be done at the same time as updating.
#[derive(Default)]
pub struct ExtraStyleData {
/// A list of effective font-face rules and their origin.
#[cfg(feature = "gecko")]
pub font_faces: Vec<Arc<Locked<FontFaceRule>>>,
/// A map of effective counter-style rules.
#[cfg(feature = "gecko")]
pub counter_styles: PrecomputedHashMap<Atom, Arc<Locked<CounterStyleRule>>>,
}
#[cfg(feature = "gecko")]
impl ExtraStyleData {
/// Add the given @font-face rule.
fn add_font_face(&mut self, rule: &Arc<Locked<FontFaceRule>>) {
self.font_faces.push(rule.clone());
}
/// Add the given @counter-style rule.
fn add_counter_style(&mut self, guard: &SharedRwLockReadGuard,
rule: &Arc<Locked<CounterStyleRule>>) {
let name = rule.read_with(guard).mName.raw::<nsIAtom>().into();
self.counter_styles.insert(name, rule.clone());
}
}
impl PerOriginClear for ExtraStyleData {
fn clear(&mut self) {
#[cfg(feature = "gecko")]
{
self.font_faces.clear();
self.counter_styles.clear();
}
}
}
/// SelectorMapEntry implementation for use in our revalidation selector map.
#[derive(Clone, Debug)]
struct RevalidationSelectorAndHashes {
@ -1599,111 +1560,11 @@ impl<'a> SelectorVisitor for StylistSelectorVisitor<'a> {
}
}
/// Data resulting from performing the CSS cascade.
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
#[derive(Debug)]
struct CascadeData {
/// Rules from user agent stylesheets
user_agent: PerOriginCascadeData,
/// Rules from author stylesheets
author: PerOriginCascadeData,
/// Rules from user stylesheets
user: PerOriginCascadeData,
}
impl CascadeData {
fn new() -> Self {
CascadeData {
user_agent: PerOriginCascadeData::new(),
author: PerOriginCascadeData::new(),
user: PerOriginCascadeData::new(),
}
}
#[inline]
fn borrow_mut_for_origin(&mut self, origin: &Origin) -> &mut PerOriginCascadeData {
match *origin {
Origin::UserAgent => &mut self.user_agent,
Origin::Author => &mut self.author,
Origin::User => &mut self.user,
}
}
fn clear(&mut self) {
self.user_agent.clear();
self.author.clear();
self.user.clear();
}
fn has_rules_for_pseudo(&self, pseudo: &PseudoElement) -> bool {
self.iter_origins().any(|d| d.has_rules_for_pseudo(pseudo))
}
fn iter_origins(&self) -> CascadeDataIter {
CascadeDataIter {
cascade_data: &self,
cur: 0,
}
}
}
/// Iterator over `PerOriginCascadeData`, from highest level (user) to lowest
/// (user agent).
///
/// We rely on this specific order for correctly looking up animations
/// (prioritizing rules at higher cascade levels), among other things.
struct CascadeDataIter<'a> {
cascade_data: &'a CascadeData,
cur: usize,
}
impl<'a> Iterator for CascadeDataIter<'a> {
type Item = &'a PerOriginCascadeData;
fn next(&mut self) -> Option<&'a PerOriginCascadeData> {
let result = match self.cur {
0 => &self.cascade_data.user,
1 => &self.cascade_data.author,
2 => &self.cascade_data.user_agent,
_ => return None,
};
self.cur += 1;
Some(result)
}
}
/// Iterator over `PerOriginExtraStyleData`, from highest level (user) to lowest
/// (user agent).
///
/// We rely on this specific order for correctly looking up the @font-face
/// and @counter-style rules.
#[cfg(feature = "gecko")]
pub struct ExtraStyleDataIter<'a> {
extra_style_data: &'a ExtraStyleData,
cur: usize,
}
#[cfg(feature = "gecko")]
impl<'a> Iterator for ExtraStyleDataIter<'a> {
type Item = (&'a PerOriginExtraStyleData, Origin);
fn next(&mut self) -> Option<(&'a PerOriginExtraStyleData, Origin)> {
let result = match self.cur {
0 => (&self.extra_style_data.user, Origin::User),
1 => (&self.extra_style_data.author, Origin::Author),
2 => (&self.extra_style_data.user_agent, Origin::UserAgent),
_ => return None,
};
self.cur += 1;
Some(result)
}
}
/// Data resulting from performing the CSS cascade that is specific to a given
/// origin.
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
#[derive(Debug)]
struct PerOriginCascadeData {
struct CascadeData {
/// Rules from stylesheets at this `CascadeData`'s origin.
element_map: SelectorMap<Rule>,
@ -1758,7 +1619,7 @@ struct PerOriginCascadeData {
num_declarations: usize,
}
impl PerOriginCascadeData {
impl CascadeData {
fn new() -> Self {
Self {
element_map: SelectorMap::new(),
@ -1783,6 +1644,12 @@ impl PerOriginCascadeData {
}
}
fn has_rules_for_pseudo(&self, pseudo: &PseudoElement) -> bool {
self.pseudos_map.get(pseudo).is_some()
}
}
impl PerOriginClear for CascadeData {
fn clear(&mut self) {
self.element_map = SelectorMap::new();
self.pseudos_map = Default::default();
@ -1796,9 +1663,11 @@ impl PerOriginCascadeData {
self.num_selectors = 0;
self.num_declarations = 0;
}
}
fn has_rules_for_pseudo(&self, pseudo: &PseudoElement) -> bool {
self.pseudos_map.get(pseudo).is_some()
impl Default for CascadeData {
fn default() -> Self {
CascadeData::new()
}
}