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
86 lines
2.9 KiB
Rust
86 lines
2.9 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::CustomEventBinding;
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use dom::bindings::codegen::Bindings::CustomEventBinding::CustomEventMethods;
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use dom::bindings::codegen::Bindings::EventBinding::EventMethods;
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use dom::bindings::codegen::InheritTypes::{EventCast, CustomEventDerived};
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use dom::bindings::error::Fallible;
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use dom::bindings::global::GlobalRef;
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use dom::bindings::js::{Root, MutHeapJSVal};
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use dom::bindings::utils::reflect_dom_object;
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use dom::event::{Event, EventTypeId};
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use js::jsapi::{JSContext, HandleValue};
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use js::jsval::JSVal;
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use util::str::DOMString;
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// https://dom.spec.whatwg.org/#interface-customevent
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#[dom_struct]
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pub struct CustomEvent {
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event: Event,
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detail: MutHeapJSVal,
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}
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impl CustomEventDerived for Event {
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fn is_customevent(&self) -> bool {
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*self.type_id() == EventTypeId::CustomEvent
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}
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}
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impl CustomEvent {
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fn new_inherited(type_id: EventTypeId) -> CustomEvent {
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CustomEvent {
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event: Event::new_inherited(type_id),
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detail: MutHeapJSVal::new(),
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}
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}
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pub fn new_uninitialized(global: GlobalRef) -> Root<CustomEvent> {
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reflect_dom_object(box CustomEvent::new_inherited(EventTypeId::CustomEvent),
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global,
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CustomEventBinding::Wrap)
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}
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pub fn new(global: GlobalRef,
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type_: DOMString,
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bubbles: bool,
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cancelable: bool,
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detail: HandleValue) -> Root<CustomEvent> {
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let ev = CustomEvent::new_uninitialized(global);
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ev.r().InitCustomEvent(global.get_cx(), type_, bubbles, cancelable, detail);
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ev
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}
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pub fn Constructor(global: GlobalRef,
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type_: DOMString,
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init: &CustomEventBinding::CustomEventInit) -> Fallible<Root<CustomEvent>>{
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Ok(CustomEvent::new(global,
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type_,
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init.parent.bubbles,
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init.parent.cancelable,
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HandleValue { ptr: &init.detail }))
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}
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}
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impl<'a> CustomEventMethods for &'a CustomEvent {
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// https://dom.spec.whatwg.org/#dom-customevent-detail
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fn Detail(self, _cx: *mut JSContext) -> JSVal {
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self.detail.get()
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}
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// https://dom.spec.whatwg.org/#dom-customevent-initcustomevent
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fn InitCustomEvent(self,
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_cx: *mut JSContext,
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type_: DOMString,
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can_bubble: bool,
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cancelable: bool,
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detail: HandleValue) {
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let event = EventCast::from_ref(self);
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if event.dispatching() {
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return;
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}
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self.detail.set(detail.get());
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event.InitEvent(type_, can_bubble, cancelable);
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}
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}
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