зеркало из https://github.com/mozilla/gecko-dev.git
servo: Merge #16874 - Use a SmallVec when gathering applicable declarations (from bholley:applicable_declarations_smallvec); r=emilio
https://bugzilla.mozilla.org/show_bug.cgi?id=1364952 Source-Repo: https://github.com/servo/servo Source-Revision: 7ca393a9603d7fa72e58a36bd53c29db396f6ea4 --HG-- extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear extra : subtree_revision : 95bb6753c4dac353f55d7d3013de5c3b589c68fa
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@ -29,7 +29,7 @@ use selectors::matching::AFFECTED_BY_PSEUDO_ELEMENTS;
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use shared_lock::StylesheetGuards;
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use sink::ForgetfulSink;
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use stylearc::Arc;
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use stylist::ApplicableDeclarationBlock;
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use stylist::ApplicableDeclarationList;
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/// The way a style should be inherited.
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enum InheritMode {
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@ -865,11 +865,11 @@ trait PrivateMatchMethods: TElement {
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}
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fn compute_rule_node<E: TElement>(rule_tree: &RuleTree,
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applicable_declarations: &mut Vec<ApplicableDeclarationBlock>,
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applicable_declarations: &mut ApplicableDeclarationList,
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guards: &StylesheetGuards)
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-> StrongRuleNode
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{
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let rules = applicable_declarations.drain(..).map(|d| (d.source, d.level));
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let rules = applicable_declarations.drain().map(|d| (d.source, d.level));
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let rule_node = rule_tree.insert_ordered_rules_with_important(rules, guards);
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rule_node
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}
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@ -994,8 +994,7 @@ pub trait MatchMethods : TElement {
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}
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}
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let mut applicable_declarations =
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Vec::<ApplicableDeclarationBlock>::with_capacity(16);
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let mut applicable_declarations = ApplicableDeclarationList::new();
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let stylist = &context.shared.stylist;
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let style_attribute = self.style_attribute();
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@ -1054,8 +1053,7 @@ pub trait MatchMethods : TElement {
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return false;
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}
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let mut applicable_declarations =
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Vec::<ApplicableDeclarationBlock>::with_capacity(16);
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let mut applicable_declarations = ApplicableDeclarationList::new();
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let map = &mut context.thread_local.selector_flags;
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let mut set_selector_flags = |element: &Self, flags: ElementSelectorFlags| {
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@ -33,7 +33,7 @@ use selectors::parser::{SelectorMethods, LocalName as LocalNameSelector};
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use selectors::visitor::SelectorVisitor;
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use shared_lock::{Locked, SharedRwLockReadGuard, StylesheetGuards};
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use sink::Push;
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use smallvec::VecLike;
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use smallvec::{SmallVec, VecLike};
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use std::borrow::Borrow;
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use std::collections::HashMap;
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use std::hash::Hash;
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@ -49,6 +49,15 @@ use viewport::{self, MaybeNew, ViewportRule};
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pub use ::fnv::FnvHashMap;
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/// List of applicable declaration. This is a transient structure that shuttles
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/// declarations between selector matching and inserting into the rule tree, and
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/// therefore we want to avoid heap-allocation where possible.
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///
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/// In measurements on wikipedia, we pretty much never have more than 8 applicable
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/// declarations, so we could consider making this 8 entries instead of 16.
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/// However, it may depend a lot on workload, and stack space is cheap.
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pub type ApplicableDeclarationList = SmallVec<[ApplicableDeclarationBlock; 16]>;
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/// This structure holds all the selectors and device characteristics
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/// for a given document. The selectors are converted into `Rule`s
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/// (defined in rust-selectors), and introduced in a `SelectorMap`
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@ -678,7 +687,7 @@ impl Stylist {
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};
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let mut declarations = vec![];
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let mut declarations = ApplicableDeclarationList::new();
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self.push_applicable_declarations(element,
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None,
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None,
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