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Rollup merge of #77203 - ecstatic-morse:const-stability-attr-checks, r=oli-obk

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Check for missing const-stability attributes in `rustc_passes`

Currently, this happens as a side effect of `is_min_const_fn`, which is non-obvious. Also adds a test for this case, since we didn't seem to have one before.
This commit is contained in:
Jonas Schievink 2020-09-27 18:37:21 +02:00 • committed by GitHub
commit 9f086fcb00
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5 changed files with 52 additions and 11 deletions
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38
compiler/rustc_passes/src/stability.rs
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@ -459,6 +459,21 @@ impl<'tcx> MissingStabilityAnnotations<'tcx> {
self.tcx.sess.span_err(span, &format!("{} has missing stability attribute", descr));
}
}
fn check_missing_const_stability(&self, hir_id: HirId, span: Span) {
let stab_map = self.tcx.stability();
let stab = stab_map.local_stability(hir_id);
if stab.map_or(false, |stab| stab.level.is_stable()) {
let const_stab = stab_map.local_const_stability(hir_id);
if const_stab.is_none() {
self.tcx.sess.span_err(
span,
"`#[stable]` const functions must also be either \
`#[rustc_const_stable]` or `#[rustc_const_unstable]`",
);
}
}
}
}
impl<'tcx> Visitor<'tcx> for MissingStabilityAnnotations<'tcx> {
@ -469,14 +484,23 @@ impl<'tcx> Visitor<'tcx> for MissingStabilityAnnotations<'tcx> {
}
fn visit_item(&mut self, i: &'tcx Item<'tcx>) {
match i.kind {
// Inherent impls and foreign modules serve only as containers for other items,
// they don't have their own stability. They still can be annotated as unstable
// and propagate this unstability to children, but this annotation is completely
// optional. They inherit stability from their parents when unannotated.
hir::ItemKind::Impl { of_trait: None, .. } | hir::ItemKind::ForeignMod(..) => {}
// Inherent impls and foreign modules serve only as containers for other items,
// they don't have their own stability. They still can be annotated as unstable
// and propagate this unstability to children, but this annotation is completely
// optional. They inherit stability from their parents when unannotated.
if !matches!(
i.kind,
hir::ItemKind::Impl { of_trait: None, .. } | hir::ItemKind::ForeignMod(..)
) {
self.check_missing_stability(i.hir_id, i.span);
}
_ => self.check_missing_stability(i.hir_id, i.span),
// Ensure `const fn` that are `stable` have one of `rustc_const_unstable` or
// `rustc_const_stable`.
if self.tcx.features().staged_api
&& matches!(&i.kind, hir::ItemKind::Fn(sig, ..) if sig.header.is_const())
{
self.check_missing_const_stability(i.hir_id, i.span);
}
intravisit::walk_item(self, i)