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Avoid repeating traversals and getting the types of fields #128396

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Avoid repeating traversals and getting the types of fields #128396

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32 changes: 14 additions & 18 deletions compiler/rustc_passes/src/dead.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -73,26 +73,22 @@ fn adt_of<'tcx>(ty: &hir::Ty<'tcx>) -> Option<(LocalDefId, DefKind)> {
}

fn struct_all_fields_are_public(tcx: TyCtxt<'_>, id: LocalDefId) -> bool {
let adt_def = tcx.adt_def(id);

// skip types contain fields of unit and never type,
// it's usually intentional to make the type not constructible
let not_require_constructor = adt_def.all_fields().any(|field| {
for field in tcx.adt_def(id).all_fields() {
let field_type = tcx.type_of(field.did).instantiate_identity();
field_type.is_unit() || field_type.is_never()
});

not_require_constructor
|| adt_def.all_fields().all(|field| {
let field_type = tcx.type_of(field.did).instantiate_identity();
// skip fields of PhantomData,
// cause it's a common way to check things like well-formedness
if field_type.is_phantom_data() {
return true;
}

field.vis.is_public()
})
// skip types contain fields of unit and never type,
// it's usually intentional to make the type not constructible
if field_type.is_unit() || field_type.is_never() {
return true;
}

// skip fields of PhantomData,
// cause it's a common way to check things like well-formedness
if !field_type.is_phantom_data() && !field.vis.is_public() {
return false;
}
}
true
}

/// check struct and its fields are public or not,
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