Implement the WIT async keyword #2073
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alexcrichton merged 4 commits intobytecodealliance:mainfrom Feb 27, 2025
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This commit fixes fuzzer fallout from bytecodealliance#2065 and related PRs where previously async destructor imports were being generated but were actually bound with synchronous destructor imports. Now `wit-component` is generating an error on async resource destructors so this fixes the generator to avoid generating such imports for now while there's not support for lowering them.
This commit is an implementation of WebAssembly/component-model#442 in this repository, namely: * The `async` identifier is now a keyword in WIT. * Functions in WIT can be annotated `async`. * New kebab-names are now recognized to round-trip this attribute through the wasm binary format: * `[async]foo` => `foo: async func()` * `[async method]foo.bar` => `resource foo { bar: async func() }` * `[async static]foo.bar` => `resource foo { bar: static async func() }` * Various new tests were updated to ensure these names are gated behind the component-model-async feature and additionally test some validation of these names. * The `wit-component` convention of "name mangling" was updated to use `[async-lower]` instead of `[async]` for lowered functions (to not conflict with the kebab-name otherwise. Additionally in exports `[async-lift]` is used instead of `[async]` as well as `[async-lift-stackful]` instead of `[async-stackful]`. * Support was added to `wit-smith` to generate `async` functions.
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* Force using `sync` resource-drop during fuzzing This commit fixes fuzzer fallout from bytecodealliance#2065 and related PRs where previously async destructor imports were being generated but were actually bound with synchronous destructor imports. Now `wit-component` is generating an error on async resource destructors so this fixes the generator to avoid generating such imports for now while there's not support for lowering them. * Implement the WIT `async` keyword This commit is an implementation of WebAssembly/component-model#442 in this repository, namely: * The `async` identifier is now a keyword in WIT. * Functions in WIT can be annotated `async`. * New kebab-names are now recognized to round-trip this attribute through the wasm binary format: * `[async]foo` => `foo: async func()` * `[async method]foo.bar` => `resource foo { bar: async func() }` * `[async static]foo.bar` => `resource foo { bar: static async func() }` * Various new tests were updated to ensure these names are gated behind the component-model-async feature and additionally test some validation of these names. * The `wit-component` convention of "name mangling" was updated to use `[async-lower]` instead of `[async]` for lowered functions (to not conflict with the kebab-name otherwise. Additionally in exports `[async-lift]` is used instead of `[async]` as well as `[async-lift-stackful]` instead of `[async-stackful]`. * Support was added to `wit-smith` to generate `async` functions. * Fix `Ord for ComponentNameKind` * Another `Ord`-related fix
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This commit is an implementation of WebAssembly/component-model#442 in
this repository, namely:
asyncidentifier is now a keyword in WIT.async.through the wasm binary format:
[async]foo=>foo: async func()[async method]foo.bar=>resource foo { bar: async func() }[async static]foo.bar=>resource foo { bar: static async func() }the component-model-async feature and additionally test some
validation of these names.
wit-componentconvention of "name mangling" was updated to use[async-lower]instead of[async]for lowered functions (to notconflict with the kebab-name otherwise. Additionally in exports
[async-lift]is used instead of[async]as well as[async-lift-stackful]instead of[async-stackful].wit-smithto generateasyncfunctions.