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Move CustomTraceable to script_bindings. (#35988)
* script: Move CustomTraceable to script_bindings. Signed-off-by: Josh Matthews <josh@joshmatthews.net> * script: Move record binding support to script_bindings. Signed-off-by: Josh Matthews <josh@joshmatthews.net> * Address clippy warnings. Signed-off-by: Josh Matthews <josh@joshmatthews.net> --------- Signed-off-by: Josh Matthews <josh@joshmatthews.net>
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Josh Matthews
GitHub
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15 changed files with 340 additions and 277 deletions
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@ -2,9 +2,32 @@
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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use std::cell::OnceCell;
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use std::hash::{BuildHasher, Hash};
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use std::marker::PhantomData;
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use crossbeam_channel::Sender;
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use html5ever::interface::{Tracer as HtmlTracer, TreeSink};
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use html5ever::tokenizer::{TokenSink, Tokenizer};
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use html5ever::tree_builder::TreeBuilder;
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use indexmap::IndexMap;
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use js::glue::CallObjectTracer;
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use js::jsapi::{GCTraceKindToAscii, Heap, JSObject, JSTracer, TraceKind};
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use parking_lot::RwLock;
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use servo_arc::Arc as ServoArc;
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use smallvec::SmallVec;
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use style::author_styles::AuthorStyles;
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use style::stylesheet_set::{AuthorStylesheetSet, DocumentStylesheetSet};
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use tendril::TendrilSink;
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use tendril::fmt::UTF8;
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use tendril::stream::LossyDecoder;
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#[cfg(feature = "webxr")]
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use webxr_api::{Finger, Hand};
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use xml5ever::interface::TreeSink as XmlTreeSink;
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use xml5ever::tokenizer::XmlTokenizer;
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use xml5ever::tree_builder::{Tracer as XmlTracer, XmlTreeBuilder};
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use crate::JSTraceable;
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use crate::error::Error;
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use crate::reflector::Reflector;
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use crate::str::{DOMString, USVString};
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@ -53,3 +76,235 @@ macro_rules! unsafe_no_jsmanaged_fields(
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unsafe_no_jsmanaged_fields!(DOMString);
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unsafe_no_jsmanaged_fields!(USVString);
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unsafe_no_jsmanaged_fields!(Error);
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/// A trait to allow tracing only DOM sub-objects.
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///
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/// # Safety
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///
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/// This trait is unsafe; if it is implemented incorrectly, the GC may end up collecting objects
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/// that are still reachable.
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pub unsafe trait CustomTraceable {
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/// Trace `self`.
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///
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/// # Safety
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///
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/// The `JSTracer` argument must point to a valid `JSTracer` in memory. In addition,
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/// implementors of this method must ensure that all active objects are properly traced
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/// or else the garbage collector may end up collecting objects that are still reachable.
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unsafe fn trace(&self, trc: *mut JSTracer);
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}
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unsafe impl<T: CustomTraceable> CustomTraceable for Box<T> {
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#[inline]
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unsafe fn trace(&self, trc: *mut JSTracer) {
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(**self).trace(trc);
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}
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}
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unsafe impl<T: JSTraceable> CustomTraceable for OnceCell<T> {
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unsafe fn trace(&self, tracer: *mut JSTracer) {
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if let Some(value) = self.get() {
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value.trace(tracer)
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}
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}
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}
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unsafe impl<T> CustomTraceable for Sender<T> {
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unsafe fn trace(&self, _: *mut JSTracer) {}
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}
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unsafe impl<T: JSTraceable> CustomTraceable for ServoArc<T> {
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unsafe fn trace(&self, trc: *mut JSTracer) {
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(**self).trace(trc)
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}
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}
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unsafe impl<T: JSTraceable> CustomTraceable for RwLock<T> {
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unsafe fn trace(&self, trc: *mut JSTracer) {
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self.read().trace(trc)
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}
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}
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unsafe impl<T: JSTraceable + Eq + Hash> CustomTraceable for indexmap::IndexSet<T> {
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#[inline]
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unsafe fn trace(&self, trc: *mut JSTracer) {
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for e in self.iter() {
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e.trace(trc);
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}
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}
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}
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// XXXManishearth Check if the following three are optimized to no-ops
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// if e.trace() is a no-op (e.g it is an unsafe_no_jsmanaged_fields type)
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unsafe impl<T: JSTraceable + 'static> CustomTraceable for SmallVec<[T; 1]> {
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#[inline]
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unsafe fn trace(&self, trc: *mut JSTracer) {
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for e in self.iter() {
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e.trace(trc);
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}
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}
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}
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unsafe impl<K, V, S> CustomTraceable for IndexMap<K, V, S>
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where
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K: Hash + Eq + JSTraceable,
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V: JSTraceable,
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S: BuildHasher,
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{
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#[inline]
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unsafe fn trace(&self, trc: *mut JSTracer) {
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for (k, v) in self {
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k.trace(trc);
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v.trace(trc);
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}
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}
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}
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unsafe impl<S> CustomTraceable for DocumentStylesheetSet<S>
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where
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S: JSTraceable + ::style::stylesheets::StylesheetInDocument + PartialEq + 'static,
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{
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unsafe fn trace(&self, tracer: *mut JSTracer) {
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for (s, _origin) in self.iter() {
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s.trace(tracer)
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}
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}
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}
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unsafe impl<S> CustomTraceable for AuthorStylesheetSet<S>
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where
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S: JSTraceable + ::style::stylesheets::StylesheetInDocument + PartialEq + 'static,
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{
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unsafe fn trace(&self, tracer: *mut JSTracer) {
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for s in self.iter() {
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s.trace(tracer)
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}
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}
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}
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unsafe impl<S> CustomTraceable for AuthorStyles<S>
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where
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S: JSTraceable + ::style::stylesheets::StylesheetInDocument + PartialEq + 'static,
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{
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unsafe fn trace(&self, tracer: *mut JSTracer) {
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self.stylesheets.trace(tracer)
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}
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}
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unsafe impl<Sink> CustomTraceable for LossyDecoder<Sink>
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where
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Sink: JSTraceable + TendrilSink<UTF8>,
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{
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unsafe fn trace(&self, tracer: *mut JSTracer) {
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self.inner_sink().trace(tracer);
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}
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}
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#[cfg(feature = "webxr")]
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unsafe impl<J> CustomTraceable for Hand<J>
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where
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J: JSTraceable,
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{
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#[inline]
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unsafe fn trace(&self, trc: *mut JSTracer) {
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// exhaustive match so we don't miss new fields
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let Hand {
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ref wrist,
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ref thumb_metacarpal,
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ref thumb_phalanx_proximal,
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ref thumb_phalanx_distal,
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ref thumb_phalanx_tip,
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ref index,
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ref middle,
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ref ring,
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ref little,
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} = *self;
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wrist.trace(trc);
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thumb_metacarpal.trace(trc);
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thumb_phalanx_proximal.trace(trc);
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thumb_phalanx_distal.trace(trc);
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thumb_phalanx_tip.trace(trc);
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index.trace(trc);
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middle.trace(trc);
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ring.trace(trc);
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little.trace(trc);
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}
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}
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#[cfg(feature = "webxr")]
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unsafe impl<J> CustomTraceable for Finger<J>
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where
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J: JSTraceable,
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{
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#[inline]
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unsafe fn trace(&self, trc: *mut JSTracer) {
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// exhaustive match so we don't miss new fields
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let Finger {
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ref metacarpal,
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ref phalanx_proximal,
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ref phalanx_intermediate,
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ref phalanx_distal,
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ref phalanx_tip,
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} = *self;
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metacarpal.trace(trc);
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phalanx_proximal.trace(trc);
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phalanx_intermediate.trace(trc);
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phalanx_distal.trace(trc);
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phalanx_tip.trace(trc);
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}
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}
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unsafe impl<Handle: JSTraceable + Clone, Sink: TreeSink<Handle = Handle> + JSTraceable>
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CustomTraceable for TreeBuilder<Handle, Sink>
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{
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unsafe fn trace(&self, trc: *mut JSTracer) {
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struct Tracer<Handle>(*mut JSTracer, PhantomData<Handle>);
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let tracer = Tracer::<Handle>(trc, PhantomData);
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impl<Handle: JSTraceable> HtmlTracer for Tracer<Handle> {
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type Handle = Handle;
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#[cfg_attr(crown, allow(crown::unrooted_must_root))]
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fn trace_handle(&self, node: &Handle) {
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unsafe {
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node.trace(self.0);
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}
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}
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}
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self.trace_handles(&tracer);
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self.sink.trace(trc);
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}
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}
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#[allow(unsafe_code)]
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unsafe impl<Handle: JSTraceable + Clone, Sink: TokenSink<Handle = Handle> + CustomTraceable>
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CustomTraceable for Tokenizer<Sink>
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{
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unsafe fn trace(&self, trc: *mut JSTracer) {
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self.sink.trace(trc);
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}
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}
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#[allow(unsafe_code)]
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unsafe impl<Handle: JSTraceable + Clone, Sink: JSTraceable + XmlTreeSink<Handle = Handle>>
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CustomTraceable for XmlTokenizer<XmlTreeBuilder<Handle, Sink>>
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{
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unsafe fn trace(&self, trc: *mut JSTracer) {
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struct Tracer<Handle>(*mut JSTracer, PhantomData<Handle>);
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let tracer = Tracer(trc, PhantomData);
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impl<Handle: JSTraceable> XmlTracer for Tracer<Handle> {
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type Handle = Handle;
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#[cfg_attr(crown, allow(crown::unrooted_must_root))]
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fn trace_handle(&self, node: &Handle) {
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unsafe {
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node.trace(self.0);
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}
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}
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}
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let tree_builder = &self.sink;
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tree_builder.trace_handles(&tracer);
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tree_builder.sink.trace(trc);
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}
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}
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