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Mention MutHeap in DESIGN.md

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Manish Goregaokar 2015-01-04 20:23:45 +05:30
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components/script/dom/bindings/DESIGN.md
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@ -37,3 +37,4 @@ For supporting SpiderMonkey’s exact GC rooting, we introduce [some types](http
- `Root<T>` contains the pointer to `JSObject` which the represented DOM type has. SpiderMonkey's conservative stack scanner scans it's pointers and marks a pointed `JSObject` as GC root.
- `JSRef` is just a reference to the value rooted by `Root<T>`.
- `RootCollection` is used to dynamically check if rooting satisfies LIFO ordering, because SpiderMonkey's GC requires LIFO order (See also: [Exact Stack Rooting - Storing a GCPointer on the CStack](https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey/Internals/GC/Exact_Stack_Rooting)).
- `MutHeap<T>` is a version of `Cell<T>` that is safe to use for internal mutability of Spidermonkey heap objects like `JSVal` and `JS<T>`