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Fix memory leak in flow tree by adding weak refs.

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Cycles were being created in the flow tree since absolutely positioned
descendants had pointers to their containing blocks. This adds
WeakFlowRef (based on Weak<T>) and makes these backpointers weak
references. This also harmonizes our custom Arc<T>, FlowRef, to be
consistent with the upstream implementation.

Fixes #4915.
This commit is contained in:
Jack Moffitt 2015-03-12 16:32:49 -06:00
parent 660ea05ddb
commit 237150fa49
4 changed files with 147 additions and 18 deletions
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components/layout/lib.rs
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@ -49,6 +49,7 @@ extern crate util;
extern crate string_cache_macros;
extern crate string_cache;
extern crate alloc;
extern crate collections;
extern crate encoding;
extern crate libc;