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23b6f569d0
Don't use unsafe Heap::new constructor <!-- Please describe your changes on the following line: --> Pulls https://github.com/servo/rust-mozjs/pull/398 and aims to close https://github.com/servo/rust-mozjs/issues/343. We can't convert from `JSVal` to `Heap<JSVal>` safely (due to GC barriers we can't move Heap value after changing its underlying value to something meaningful, e.g. non-null or non-undefined), so I decided to also wrap the Heap values in a Box (and in dictionaries in RootedTraceableBox, see https://github.com/servo/servo/pull/20265#issuecomment-372838379 and the issue for more details) in dictionaries. Since we allocate more to be safe, I think it'd be good to also do some sort of a JS perf run, if there is any to see if there's any significant overhead. r? @jdm --- <!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: --> - [X] `./mach build -d` does not report any errors - [X] `./mach test-tidy` does not report any errors - [ ] These changes fix #__ (github issue number if applicable). <!-- Either: --> - [ ] There are tests for these changes OR - [X] These changes do not require tests because checking for not moving Heap after setting a value would require encoding a lot more info in type system (Heap) and I'm not sure how to do that and end up with an ergonomic and consistent API <!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.--> <!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. --> <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/20314) <!-- Reviewable:end --> |
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| allocator | ||
| atoms | ||
| bluetooth | ||
| bluetooth_traits | ||
| canvas | ||
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| compositing | ||
| config | ||
| constellation | ||
| debugger | ||
| deny_public_fields | ||
| devtools | ||
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| dom_struct | ||
| domobject_derive | ||
| fallible | ||
| geometry | ||
| gfx | ||
| gfx_traits | ||
| hashglobe | ||
| jstraceable_derive | ||
| layout | ||
| layout_thread | ||
| layout_traits | ||
| malloc_size_of | ||
| malloc_size_of_derive | ||
| metrics | ||
| msg | ||
| net | ||
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| nonzero | ||
| profile | ||
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| rand | ||
| range | ||
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| script | ||
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| script_plugins | ||
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| selectors | ||
| servo | ||
| servo_arc | ||
| size_of_test | ||
| style | ||
| style_derive | ||
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| url | ||
| webdriver_server | ||
| webvr | ||
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