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[Types] Fix missing inverse check for described field in isValidSupertype #8378

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[Types] Fix missing inverse check for described field in isValidSupertype #8378

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[Types] Fix missing inverse check for described field in isValidSuper…
sumleo Feb 25, 2026
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sumleo Feb 26, 2026
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6 changes: 6 additions & 0 deletions src/wasm/wasm-type.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2419,6 +2419,12 @@ bool isValidSupertype(const HeapTypeInfo& sub, const HeapTypeInfo& super) {
if (!super.described || sub.described->supertype != super.described) {
return false;
}
} else {
// A supertype of a type without a describes clause must also not have a
// describes clause.
if (super.described) {
return false;
}
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@kripken kripken Feb 25, 2026

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I believe this is not correct, but the spec changed and I'm not sure - @tlively ?

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@tlively tlively Feb 25, 2026

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This is correct! We do not allow this:

(type $foo (descriptor $super) (struct))
(type $super (sub (describes $foo) (struct)))
(type $sub (sub $super) (struct))

}
SubTyper typer;
switch (sub.kind) {
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