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Since WebAssembly/component-model#646 a function that isn't `async` in WIT can't be lifted or lowered async, so the only override that still makes sense is turning an `async` function back to sync. `--sync` takes the filters `--async` took, without the `-` prefix. The `generate!` option is renamed the same way, and `async:` now errors and points at `sync:`. The `--async=all` codegen test variant for Rust, C and MoonBit is removed: it generated async imports and exports for sync functions, which can't be put in a component. Closes bytecodealliance#1622 Closes bytecodealliance#1623
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As discussed in #1622: functions that are
asyncin WIT get async bindings, everything else gets sync bindings, and--syncis the only override. It takes the same filters--asyncdid (all,foo:bar/baz#f,import:…,export:…), without the-prefix. Since they only go one way now, their order no longer matters.generate!takessync: true/sync: [...]in place ofasync:, andasync:now fails with a message pointing atsync:.For reference,
async: trueon main builds fine for a world with a sync import, and then wasmtime refuses the component with "theasynccanonical option requires an async function type".The
--async=allcodegen variant for Rust, C and MoonBit is gone. Swapping it for--sync=allpasses for Rust and C, but only 3 of the 109 codegen tests have async functions, so it would mostly repeat the default run. Happy to add it if you'd like.Ran the Rust and C codegen and runtime tests locally, plus the crate tests, clippy and rustfmt. I couldn't run Go or MoonBit end to end here; their generators only see the renamed flag, and the MoonBit direction test is updated for it.
Closes #1622
Closes #1623