Properly validate ref.cast when lacking a common supertype #6741
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tlively
reviewed
Jul 12, 2024
| // earlier), then the cast is unreachable because the cast type had no | ||
| // common supertype with the ref, which is invalid. This is the same as the | ||
| // check below us, but we must do it first (as getHeapType fails otherwise). | ||
| if (!shouldBeUnequal( |
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We could tighten this up even more by checking that the result type is a reference type. So if it somehow was set to i32 or something, we would still avoid the assertion failure.
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Sounds good, I added that now as an extra test (it has a more generic error message, and I didn't want to lose the specific explanation for the supertype issue).
tlively
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Jul 23, 2024
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When lacking a common supertype the GLB operation makes the type of the cast
unreachable, which errors on
getHeapTypein the later code.Fixes #6738