Collapse resource tables to be per-instance, not per-resource#10701
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alexcrichton merged 1 commit intobytecodealliance:mainfrom Apr 30, 2025
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This commit is an update to how Wasmtime represents and processes resource handles for components. The upstream specification changed in WebAssembly/component-model#427 and while it's been awhile since that change this is Wasmtime catching up to that change. It's expected that these paths are going to get stressed more with component model async and more kinds of handles so this additionally refactors things to leave sort of "holes" where async resources are going to go. This notably will result in different behavior for guest programs. Previously if there were two resources imported into a guest they could have overlapping indices and now they're going to all have disjoint indices since they're all in the same index space. It's expected that this is will have a minimal, if any, impact on component guests as in theory they're all mostly treating handles as opaque indexes today anyway.
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cc @dicej |
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I'll also note that the original motivation for this spec change, WebAssembly/component-model#395, also detailed improved error messages from runtime about mismatches in index types. For example the original issue was importing two versions of |
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This commit is an update to how Wasmtime represents and processes resource handles for components. The upstream specification changed in WebAssembly/component-model#427 and while it's been awhile since that change this is Wasmtime catching up to that change. It's expected that these paths are going to get stressed more with component model async and more kinds of handles so this additionally refactors things to leave sort of "holes" where async resources are going to go.
This notably will result in different behavior for guest programs. Previously if there were two resources imported into a guest they could have overlapping indices and now they're going to all have disjoint indices since they're all in the same index space. It's expected that this is will have a minimal, if any, impact on component guests as in theory they're all mostly treating handles as opaque indexes today anyway.