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This repository was archived by the owner on Nov 3, 2021. It is now read-only.
This repository was archived by the owner on Nov 3, 2021. It is now read-only.

Typeability Bug in Reference Implementation #111

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@RossTate

Description

@RossTate

If I'm reading this code correctly, the reference interpretation incorrectly accepts this invalid instruction sequence:

(unreachable)
(select)
(ref.is_null funcref) ;; specific reference type doesn't matter

The issue is that select is polymorphic with respect to numeric types only. So while the result type of select after unreachable is unknown, it must at least be a numeric type. As such, it cannot be used for any instruction expecting a reference type.

The reference interpreter seems to fail to incorporate this reasoning. Instead of using value_type option, the reference interpreter seems to need to use an ADT with an additional nullary case that represents only unknown numeric types.

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