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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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8
components/layout/layout_task.rs
View file

@ -804,8 +804,12 @@ impl LayoutTask {
}
if needs_reflow {
self.try_get_layout_root(*node).map(
|mut flow| LayoutTask::reflow_all_nodes(&mut *flow));
match self.try_get_layout_root(*node) {
None => {}
Some(mut flow) => {
LayoutTask::reflow_all_nodes(&mut *flow);
}
}
}
// Create a layout context for use throughout the following passes.