forked from mirrors/gecko-dev
7512d04e93
> Here it is. > > ~~There's two major things that are unfinished here:~~ > - ~~Dealing with the unroot_must_root lint. I'm not sure about the value of this lint with the new rooting API.~~ Done. > - ~~Updating the Cargo.locks to point to the new SM and SM binding.~~ Done. > > I also included my fixes for the rust update, but these will disappear in a rebase. A rust update is necessary to support calling `Drop` on `Heap<T>` correctly when `Heap<T>` is inside a `Rc<T>`. Otherwise `&self` points to the wrong location. > > Incremental GC is disabled here. I'm not sure how to deal with the incremental barriers so that's left for later. > > Generational GC works. SM doesn't work without it. > > The biggest change here is to the rooting API. `Root` was made movable, and `Temporary` and `JSRef` was removed. Movable `Root`s means there's no need for `Temporary`, and `JSRef`s aren't needed generally since it can be assumed that being able to obtain a reference to a dom object means it's already rooted. References have their lifetime bound to the Roots that provided them. DOM objects that haven't passed through `reflect_dom_object` don't need to be rooted, and DOM objects that have passed through `reflect_dom_object` can't be obtained without being rooted through `native_from_reflector_jsmanaged` or `JS::<T>::root()`. > > Support for `Heap<T>` ended up messier than I expected. It's split into two commits, but only because it's a bit difficult to fold them together. Supporting `Heap<T>` properly requires that that `Heap::<T>::set()` be called on something that won't move. I removed the Copy and Clone trait from `Heap<T>` so `Cell` can't hold `Heap<T>` - only `UnsafeCell` can hold it. > > `CallbackObject` is a bit tricky - I moved all callbacks into `Rc<T>` in order to make sure that the pointer inside to a `*mut JSObject` doesn't move. This is necessary for supporting `Heap<T>`. > > `RootedCollectionSet` is very general purpose now. Anything with `JSTraceable` can be rooted by `RootedCollectionSet`/`RootedTraceable`. Right now, `RootedTraceable` is only used to hold down dom objects before they're fully attached to their reflector. I had to make a custom mechanism to dispatch the trace call - couldn't figure out how to get trait objects working for this case. > > This has been tested with the following zeal settings: > > GC after every allocation > JS_GC_ZEAL=2,1 > > GC after every 100 allocations (important for catching use-after-free bugs) > JS_GC_ZEAL=2,100 > > Verify pre barriers > JS_GC_ZEAL=4,1 > > Verify post barriers > JS_GC_ZEAL=11,1 Source-Repo: https://github.com/servo/servo Source-Revision: e7808c526c348fea5e3b48af70b7f1a066652097
46 lines
1.7 KiB
Rust
46 lines
1.7 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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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 http://mozilla.org/MPL/2.0/. */
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use dom::bindings::codegen::Bindings::HTMLTableCaptionElementBinding;
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use dom::bindings::codegen::InheritTypes::HTMLTableCaptionElementDerived;
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use dom::bindings::js::Root;
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use dom::document::Document;
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use dom::eventtarget::{EventTarget, EventTargetTypeId};
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use dom::element::ElementTypeId;
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use dom::htmlelement::{HTMLElement, HTMLElementTypeId};
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use dom::node::{Node, NodeTypeId};
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use util::str::DOMString;
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#[dom_struct]
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pub struct HTMLTableCaptionElement {
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htmlelement: HTMLElement
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}
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impl HTMLTableCaptionElementDerived for EventTarget {
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fn is_htmltablecaptionelement(&self) -> bool {
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*self.type_id() ==
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EventTargetTypeId::Node(
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLTableCaptionElement)))
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}
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}
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impl HTMLTableCaptionElement {
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fn new_inherited(localName: DOMString,
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prefix: Option<DOMString>,
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document: &Document) -> HTMLTableCaptionElement {
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HTMLTableCaptionElement {
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htmlelement:
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HTMLElement::new_inherited(HTMLElementTypeId::HTMLTableCaptionElement, localName, prefix, document)
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}
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}
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#[allow(unrooted_must_root)]
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pub fn new(localName: DOMString,
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prefix: Option<DOMString>,
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document: &Document) -> Root<HTMLTableCaptionElement> {
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let element = HTMLTableCaptionElement::new_inherited(localName, prefix, document);
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Node::reflect_node(box element, document, HTMLTableCaptionElementBinding::Wrap)
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}
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}
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