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Rollup merge of #105082 - Swatinem:async-abi, r=compiler-errors

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Fix Async Generator ABI

This change was missed when making async generators implement `Future` directly.
It did not cause any problems in codegen so far, as `GeneratorState<(), Output>`
happens to have the same ABI as `Poll<Output>`.
This commit is contained in:
Matthias Krüger 2022-12-10 09:24:43 +01:00 committed by GitHub
commit 020d7af949
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 17 additions and 5 deletions
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22
compiler/rustc_ty_utils/src/abi.rs
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@ -85,7 +85,7 @@ fn fn_sig_for_fn_abi<'tcx>(
bound_vars,
)
}
ty::Generator(_, substs, _) => {
ty::Generator(did, substs, _) => {
let sig = substs.as_generator().poly_sig();
let bound_vars = tcx.mk_bound_variable_kinds(
@ -104,10 +104,22 @@ fn fn_sig_for_fn_abi<'tcx>(
let env_ty = tcx.mk_adt(pin_adt_ref, pin_substs);
let sig = sig.skip_binder();
let state_did = tcx.require_lang_item(LangItem::GeneratorState, None);
let state_adt_ref = tcx.adt_def(state_did);
let state_substs = tcx.intern_substs(&[sig.yield_ty.into(), sig.return_ty.into()]);
let ret_ty = tcx.mk_adt(state_adt_ref, state_substs);
// The `FnSig` and the `ret_ty` here is for a generators main
// `Generator::resume(...) -> GeneratorState` function in case we
// have an ordinary generator, or the `Future::poll(...) -> Poll`
// function in case this is a special generator backing an async construct.
let ret_ty = if tcx.generator_is_async(did) {
let state_did = tcx.require_lang_item(LangItem::Poll, None);
let state_adt_ref = tcx.adt_def(state_did);
let state_substs = tcx.intern_substs(&[sig.return_ty.into()]);
tcx.mk_adt(state_adt_ref, state_substs)
} else {
let state_did = tcx.require_lang_item(LangItem::GeneratorState, None);
let state_adt_ref = tcx.adt_def(state_did);
let state_substs = tcx.intern_substs(&[sig.yield_ty.into(), sig.return_ty.into()]);
tcx.mk_adt(state_adt_ref, state_substs)
};
ty::Binder::bind_with_vars(
tcx.mk_fn_sig(
[env_ty, sig.resume_ty].iter(),