Problems:
* the Heap::new constructor is memory-unsafe with any value other than Undefined/Null
* this means that moving dictionaries containing Heap values (ie. any/object) is memory-unsafe
* unions containing GC pointers are similarly unsafe
Solutions:
- dictionaries containing GC pointers are now wrapped in RootedTraceableBox (even inside other dictionaries)
- instead of using Heap::new, dictionaries containing GC pointers are now initialized to a default value (by deriving Default) and mutated one field at a time
- dictionaries containing GC pointers are marked #[must_root]
- FromJSVal for dictionaries containing GC pointers now returns RootedTraceableBox<Dictionary>
- unions wrap their variants that require rooting in RootedTraceableBox
Rather than attempting to derive Default for all dictionaries, we only do so for the dictionaries that require it. Because some dictionaries that require it inherit from dictionaries that do not, we need to write manual implementations for those parent dictionaries. This is a better option than having to figure out a default value for types like `Root<T>`, which would be required for deriving Default for all dictionaries.
I would still like to come up with an automated test for this, but I figured I would get eyes on this first.
---
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix#16952
- [ ] There are tests for these changes
Source-Repo: https://github.com/servo/servo
Source-Revision: 532dee36c10b7dd5d33e560b55cf65c7243ef1d3
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Automatically verify that derive() lists are alphabetically ordered #18172
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Source-Repo: https://github.com/servo/servo
Source-Revision: 474369618965569407d127b1e8c481e757cc59d3
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Source-Repo: https://github.com/servo/servo
Source-Revision: c6e15f8ef244a0f3859489ca7f1c7bcc80181468
I have no idea why it was added, and it appears to be unused.
Source-Repo: https://github.com/servo/servo
Source-Revision: 851e7098c93a354fdf04808e7935f1bb3721e82b
This implements just enough of [Touch Events](http://w3c.github.io/touch-events/) to enable scrolling on Android without regressing basic single-touch interaction like clicking on links.
Dragging a page will scroll it, unless the page calls `preventDefault` on the "touchstart" event.
Does **not** yet support pinch zooming or other multi-touch gestures or events.
Includes a `-Z convert-mouse-to-touch` command line flag for testing on non-touch platforms. This is also enabled by default on Android because Glutin currently translates touch input to mouse events on Android.
Source-Repo: https://github.com/servo/servo
Source-Revision: dcd207f9bf15c9ecf5d043385ba93277e69201f6
fixes#6524. I had to make an additional change not mentioned in the ticket - adding the `#[feature]` to enable deriving custom traits but I assume that's expected at this time.
Source-Repo: https://github.com/servo/servo
Source-Revision: bbb39082e0f640400546d2084a450a8675820a82
