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implement checks for tail calls #133607

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merged 6 commits into from
Dec 6, 2024
Merged

implement checks for tail calls #133607

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cfb7841
implement checks for tail calls
WaffleLapkin May 11, 2023
3208b86
use `expect(incomplete_feature)` instead of `allow` in tail call tests
WaffleLapkin Nov 29, 2024
d93ea6b
simplify things by using `tcx.fn_trait_kind_from_def_id`
WaffleLapkin Nov 29, 2024
ef5808a
add a fixme for tailcalls with opaque types
WaffleLapkin Nov 29, 2024
c6454dd
don't polymorphize without a reason to
WaffleLapkin Nov 29, 2024
144d6cc
simplify things using `tcx.as_lang_item`
WaffleLapkin Nov 29, 2024
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6 changes: 6 additions & 0 deletions compiler/rustc_middle/src/query/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -916,6 +916,12 @@ rustc_queries! {
cache_on_disk_if { true }
}

/// Checks well-formedness of tail calls (`become f()`).
query check_tail_calls(key: LocalDefId) -> Result<(), rustc_errors::ErrorGuaranteed> {
desc { |tcx| "tail-call-checking `{}`", tcx.def_path_str(key) }
cache_on_disk_if { true }
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probably dont need this caching

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or at least possibly seeing if this is perf sensitive

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This was copied from check_unsafety, we might want to change it too 🤔

}

/// Returns the types assumed to be well formed while "inside" of the given item.
///
/// Note that we've liberated the late bound regions of function signatures, so
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4 changes: 4 additions & 0 deletions compiler/rustc_mir_build/src/build/mod.rs
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Expand Up @@ -50,6 +50,10 @@ pub(crate) fn mir_build<'tcx>(tcx: TyCtxtAt<'tcx>, def: LocalDefId) -> Body<'tcx
return construct_error(tcx, def, e);
}

if let Err(err) = tcx.check_tail_calls(def) {
return construct_error(tcx, def, err);
}

let body = match tcx.thir_body(def) {
Err(error_reported) => construct_error(tcx, def, error_reported),
Ok((thir, expr)) => {
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