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
58 lines
2.2 KiB
Rust
58 lines
2.2 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::PerformanceBinding;
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use dom::bindings::codegen::Bindings::PerformanceBinding::PerformanceMethods;
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use dom::bindings::global::GlobalRef;
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use dom::bindings::js::{JS, Root};
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use dom::bindings::num::Finite;
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use dom::bindings::utils::{Reflector, reflect_dom_object};
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use dom::performancetiming::{PerformanceTiming, PerformanceTimingHelpers};
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use dom::window::Window;
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use time;
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pub type DOMHighResTimeStamp = Finite<f64>;
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#[dom_struct]
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pub struct Performance {
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reflector_: Reflector,
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timing: JS<PerformanceTiming>,
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}
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impl Performance {
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fn new_inherited(window: &Window,
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navigation_start: u64,
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navigation_start_precise: f64) -> Performance {
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Performance {
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reflector_: Reflector::new(),
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timing: JS::from_rooted(&PerformanceTiming::new(window,
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navigation_start,
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navigation_start_precise)),
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}
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}
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pub fn new(window: &Window,
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navigation_start: u64,
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navigation_start_precise: f64) -> Root<Performance> {
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reflect_dom_object(box Performance::new_inherited(window,
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navigation_start,
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navigation_start_precise),
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GlobalRef::Window(window),
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PerformanceBinding::Wrap)
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}
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}
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impl<'a> PerformanceMethods for &'a Performance {
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fn Timing(self) -> Root<PerformanceTiming> {
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self.timing.root()
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}
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// https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/HighResolutionTime/Overview.html#dom-performance-now
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fn Now(self) -> DOMHighResTimeStamp {
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let navStart = self.timing.root().r().NavigationStartPrecise();
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let now = (time::precise_time_ns() as f64 - navStart) / 1000000 as f64;
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Finite::wrap(now)
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}
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}
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