[wasm] Add @_extern(wasm) attribute support #69107
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This attribute instructs the compiler that this function declaration
should be "import"ed from host environment. It's equivalent of Clang's
`__attribute__((import_module("module"), import_name("field")))`
kateinoigakukun
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kateinoigakukun
added
WebAssembly
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egorzhdan,
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rintaro
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al45tair
approved these changes
Oct 12, 2023
MaxDesiatov
approved these changes
Oct 12, 2023
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This attribute instructs the compiler that this function declaration should be "import"ed from host environment. It's equivalent of Clang's
__attribute__((import_module("module"), import_name("field")))The attribute doesn't have any effect on to function signature and calling convention but only adds LLVM meta attribute to the function. Currently there is no way to declare a function with non SwiftCC, so functions are always imported as having SwiftCC. (I'm planning to add
@_extern(c)after this change will be merged. Combination with them makes the declaration to be imported from WebAssembly host using C convention)This is the import version of #68524, which adds an attribute to export functions.
@_extern(wasm, module: <module-name>, name: <name>)wasm-import-nameandwasm-import-moduleResolves rdar://115502075