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style: Share CascadeData instances across ShadowRoots

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This should be both a memory and speed win for pages using a lot of
Shadow DOM.

In order to make the cache properly work we need to start keying media query
results on the actual StyleSheetContents, as that's what we share on Gecko, but
that should all be fine.

Differential Revision: https://phabricator.services.mozilla.com/D107266
This commit is contained in:
Oriol Brufau 2023-05-16 09:51:46 +02:00
parent 11153c63fa
commit 060d74ba3b
11 changed files with 175 additions and 178 deletions
Download patch file Download diff file Expand all files Collapse all files

31
components/style/gecko/data.rs
View file

@ -4,7 +4,6 @@
//! Data needed to style a Gecko document.
use crate::context::QuirksMode;
use crate::dom::TElement;
use crate::gecko_bindings::bindings;
use crate::gecko_bindings::structs::{self, RawServoStyleSet, ServoStyleSetSizes};
@ -15,7 +14,7 @@ use crate::media_queries::{Device, MediaList};
use crate::properties::ComputedValues;
use crate::selector_parser::SnapshotMap;
use crate::shared_lock::{Locked, SharedRwLockReadGuard, StylesheetGuards};
use crate::stylesheets::{CssRule, Origin, StylesheetContents, StylesheetInDocument};
use crate::stylesheets::{StylesheetContents, StylesheetInDocument};
use crate::stylist::Stylist;
use atomic_refcell::{AtomicRef, AtomicRefCell, AtomicRefMut};
use malloc_size_of::MallocSizeOfOps;
@ -69,16 +68,6 @@ impl GeckoStyleSheet {
fn inner(&self) -> &StyleSheetInfo {
unsafe { &*(self.raw().mInner as *const StyleSheetInfo) }
}
/// Gets the StylesheetContents for this stylesheet.
pub fn contents(&self) -> &StylesheetContents {
debug_assert!(!self.inner().mContents.mRawPtr.is_null());
unsafe {
let contents =
(&**StylesheetContents::as_arc(&&*self.inner().mContents.mRawPtr)) as *const _;
&*contents
}
}
}
impl Drop for GeckoStyleSheet {
@ -95,14 +84,6 @@ impl Clone for GeckoStyleSheet {
}
impl StylesheetInDocument for GeckoStyleSheet {
fn origin(&self, _guard: &SharedRwLockReadGuard) -> Origin {
self.contents().origin
}
fn quirks_mode(&self, _guard: &SharedRwLockReadGuard) -> QuirksMode {
self.contents().quirks_mode
}
fn media<'a>(&'a self, guard: &'a SharedRwLockReadGuard) -> Option<&'a MediaList> {
use crate::gecko_bindings::structs::mozilla::dom::MediaList as DomMediaList;
use std::mem;
@ -120,13 +101,19 @@ impl StylesheetInDocument for GeckoStyleSheet {
// All the stylesheets Servo knows about are enabled, because that state is
// handled externally by Gecko.
#[inline]
fn enabled(&self) -> bool {
true
}
#[inline]
fn rules<'a, 'b: 'a>(&'a self, guard: &'b SharedRwLockReadGuard) -> &'a [CssRule] {
self.contents().rules(guard)
fn contents(&self) -> &StylesheetContents {
debug_assert!(!self.inner().mContents.mRawPtr.is_null());
unsafe {
let contents =
(&**StylesheetContents::as_arc(&&*self.inner().mContents.mRawPtr)) as *const _;
&*contents
}
}
}