CoalesceLocals: ReFinalize when we refine a type #6502
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tlively
approved these changes
Apr 15, 2024
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Did you mean to close this instead of merging it? |
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I must have pressed the wrong button somehow, yeah... not sure how that happened. |
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What's weird is it also deleted the branch, which I'm pretty sure is not automatic (certainly after merge it is not automatic, I do it manually each time) so I would have had to press two wrong buttons... which makes me wonder if there was not a github bug of some kind here. |
aheejin
approved these changes
Apr 16, 2024
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The code had a different workaround, namely to add a block with an explicit
type to avoid changing the type at all (i.e. the block declared the original
type of the thing we replaced, not the refined type). But by adding a block we
can end up with an invalid pop, as the fuzzer found, see the EH testcase here.
To fix this, use the usual workaround of just running ReFinalize. That is simpler
and also improves the code while we do it. It does add more work, but this is
likely a very rare situation anyhow.