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Deduplicate tcx.instance_mir(instance) calls in try_instance_mir #120778

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Feb 8, 2024
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Deduplicate tcx.instance_mir(instance) calls in try_instance_mir #120778

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25 changes: 10 additions & 15 deletions compiler/rustc_mir_transform/src/inline.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1027,21 +1027,16 @@ fn try_instance_mir<'tcx>(
tcx: TyCtxt<'tcx>,
instance: InstanceDef<'tcx>,
) -> Result<&'tcx Body<'tcx>, &'static str> {
match instance {
ty::InstanceDef::DropGlue(_, Some(ty)) => match ty.kind() {
ty::Adt(def, args) => {
let fields = def.all_fields();
for field in fields {
let field_ty = field.ty(tcx, args);
if field_ty.has_param() && field_ty.has_projections() {
return Err("cannot build drop shim for polymorphic type");
}
}

Ok(tcx.instance_mir(instance))
if let ty::InstanceDef::DropGlue(_, Some(ty)) = instance
&& let ty::Adt(def, args) = ty.kind()
{
let fields = def.all_fields();
for field in fields {
let field_ty = field.ty(tcx, args);
if field_ty.has_param() && field_ty.has_projections() {
return Err("cannot build drop shim for polymorphic type");
}
_ => Ok(tcx.instance_mir(instance)),
},
_ => Ok(tcx.instance_mir(instance)),
}
}
Ok(tcx.instance_mir(instance))
}
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