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Reduce the size of top_down_dom stackframes.
The idea is to put the memmoving of the ThreadLocalContext out of line from the point of view of top_down_dom so we don't need to allocate a large chunk of stack space for it.
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3616b8f0c3
commit
93271e199b
2 changed files with 24 additions and 4 deletions
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@ -125,6 +125,19 @@ pub fn traverse_dom<E, D>(traversal: &D,
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}
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}
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/// A callback to create our thread local context. This needs to be
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/// out of line so we don't allocate stack space for the entire struct
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/// in the caller.
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#[inline(never)]
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fn create_thread_local_context<'scope, E, D>(
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traversal: &'scope D,
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slot: &mut Option<D::ThreadLocalContext>)
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where E: TElement + 'scope,
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D: DomTraversal<E>
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{
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*slot = Some(traversal.create_thread_local_context())
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}
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/// A parallel top-down DOM traversal.
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///
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/// This algorithm traverses the DOM in a breadth-first, top-down manner. The
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@ -153,7 +166,8 @@ fn top_down_dom<'a, 'scope, E, D>(nodes: &'a [SendNode<E::ConcreteNode>],
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{
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// Scope the borrow of the TLS so that the borrow is dropped before
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// a potential recursive call when we pass TailCall.
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let mut tlc = tls.ensure(|| traversal.create_thread_local_context());
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let mut tlc = tls.ensure(
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|slot: &mut Option<D::ThreadLocalContext>| create_thread_local_context(traversal, slot));
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for n in nodes {
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// If the last node we processed produced children, spawn them off
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