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[LVI] Restructure caching

Authored by nikic on Mon, Nov 18, 12:59 AM.



Variant on D70103. The caching is switched to always use a BB to cache entry map, which then contains per-value caches. A separate set contains value handles with a deletion callback. This allows us to properly invalidate overdefined values.

A possible alternative would be to always cache by value first and have per-BB maps/sets in the each cache entry. In that case we could use a ValueMap and would avoid the separate value handle set. I went with the BB indexing at the top level to make it easier to integrate D69914, but possibly that's not the right choice.

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nikic created this revision.Mon, Nov 18, 12:59 AM
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efriedma accepted this revision.Mon, Nov 18, 4:36 PM

Simpler is good, I think. And I like the use of AssertingVH. LGTM.

It would be nice to have a testcase for PR43909? But not critical, I think; the expanded use of AssertingVH should catch any future issues here.

This revision is now accepted and ready to land.Mon, Nov 18, 4:36 PM
nikic added a subscriber: reames.

@efriedma When using AssertingVH a bunch of the existing JT/CVP tests start to fail, so I think we don't need a test case that produces an actual collision in the map.

Adding @reames in case he has some thoughts on how we handle caching/invalidation.

uenoku added a subscriber: uenoku.Tue, Nov 19, 4:59 AM
fhahn added a subscriber: fhahn.Tue, Nov 19, 8:40 AM
jmorse added a subscriber: jmorse.Thu, Nov 28, 2:06 AM
reames added a comment.Mon, Dec 2, 5:15 PM

Adding @reames in case he has some thoughts on how we handle caching/invalidation.

This looks very reasonable to me. I ran through it and didn't spot anything obviously problematic, so also LGTM.

nikic updated this revision to Diff 232150.Wed, Dec 4, 8:38 AM

Don't use AssertingVH for BasicBlock. See D29006 for why this needs to be a PoisoningVH. I believe using AssertingVH should be fine for the Value case though, as have a CallbackVH that should *always* remove these.

This revision was automatically updated to reflect the committed changes.