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GTO already handled keeping the prototype configuration fields on descriptors of types that flowed out to JS via @binaryen.js.called functions, but it did not handle propagating the information that a type flows out to JS to that type's subtypes. It also did not consider that types may flow out to JS via imports and exports. Fix these issues.
kripken
reviewed
Mar 11, 2026
| if (global->imported() && global->mutable_) { | ||
| flowOut(global->type); | ||
| } | ||
| } |
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I wonder if we can share this logic with your last PR? a general utility that finds the flow out/flow in JS stuff.
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Oh yes, that's a good idea. Do you mind if I do it as a follow-up?
kripken
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Mar 11, 2026
test/lit/passes/gto-jsinterop.wast
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| (type $sub-desc (describes $sub) (struct (field externref i64))) | ||
| ) | ||
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| ;; $super flows out, so $sub is exposed, so $sub-desc field is kept. |
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Suggested change
| ;; $super flows out, so $sub is exposed, so $sub-desc field is kept. | |
| ;; $super flows out, so $sub is exposed, so $sub-desc's externref field is kept. |
kripken
reviewed
Mar 11, 2026
test/lit/passes/gto-jsinterop.wast
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| (module | ||
| ;; Same, but now the type is exact on the boundary, so it does not propagate | ||
| ;; exposure to subtypes. We can optimize $sub-desc. |
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| ;; exposure to subtypes. We can optimize $sub-desc. | |
| ;; exposure to subtypes. We can remove all $sub-desc's fields, unlike before. |
kripken
reviewed
Mar 11, 2026
test/lit/passes/gto-jsinterop.wast
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| (module | ||
| ;; Same, but now there is an abstract supertype on the boundary. We still | ||
| ;; propagate expose and keep the externref field in $sub-desc. |
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Will fix to "propagate the fact that the type flows out..."
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GTO already handled keeping the prototype configuration fields on
descriptors of types that flowed out to JS via @binaryen.js.called
functions, but it did not handle propagating the information that a
type flows out to JS to that type's subtypes. It also did not consider
that types may flow out to JS via imports and exports. Fix these issues.