remove UnsafetyChecker
Signed-off-by: Miguel Guarniz <mi9uel9@gmail.com>
This commit is contained in:
Miguel Guarniz
parent
7c3c588988
commit
f47f39b95f
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@ -3,101 +3,154 @@
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use rustc_errors::struct_span_err;
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use rustc_hir as hir;
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use rustc_hir::itemlikevisit::ItemLikeVisitor;
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use rustc_hir::def::DefKind;
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use rustc_hir::Unsafety;
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use rustc_middle::ty::TyCtxt;
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pub fn check(tcx: TyCtxt<'_>) {
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let mut unsafety = UnsafetyChecker { tcx };
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tcx.hir().visit_all_item_likes(&mut unsafety);
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}
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struct UnsafetyChecker<'tcx> {
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tcx: TyCtxt<'tcx>,
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}
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impl<'tcx> UnsafetyChecker<'tcx> {
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fn check_unsafety_coherence(
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&mut self,
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item: &hir::Item<'_>,
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impl_generics: Option<&hir::Generics<'_>>,
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unsafety: hir::Unsafety,
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polarity: hir::ImplPolarity,
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) {
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if let Some(trait_ref) = self.tcx.impl_trait_ref(item.def_id) {
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let trait_def = self.tcx.trait_def(trait_ref.def_id);
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let unsafe_attr = impl_generics.and_then(|generics| {
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generics.params.iter().find(|p| p.pure_wrt_drop).map(|_| "may_dangle")
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});
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match (trait_def.unsafety, unsafe_attr, unsafety, polarity) {
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(Unsafety::Normal, None, Unsafety::Unsafe, hir::ImplPolarity::Positive) => {
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struct_span_err!(
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self.tcx.sess,
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item.span,
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E0199,
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"implementing the trait `{}` is not unsafe",
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trait_ref.print_only_trait_path()
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)
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.emit();
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}
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(Unsafety::Unsafe, _, Unsafety::Normal, hir::ImplPolarity::Positive) => {
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struct_span_err!(
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self.tcx.sess,
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item.span,
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E0200,
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"the trait `{}` requires an `unsafe impl` declaration",
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trait_ref.print_only_trait_path()
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)
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.emit();
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}
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(
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Unsafety::Normal,
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Some(attr_name),
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Unsafety::Normal,
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hir::ImplPolarity::Positive,
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) => {
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struct_span_err!(
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self.tcx.sess,
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item.span,
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E0569,
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"requires an `unsafe impl` declaration due to `#[{}]` attribute",
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attr_name
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)
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.emit();
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}
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(_, _, Unsafety::Unsafe, hir::ImplPolarity::Negative(_)) => {
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// Reported in AST validation
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self.tcx.sess.delay_span_bug(item.span, "unsafe negative impl");
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}
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(_, _, Unsafety::Normal, hir::ImplPolarity::Negative(_))
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| (Unsafety::Unsafe, _, Unsafety::Unsafe, hir::ImplPolarity::Positive)
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| (Unsafety::Normal, Some(_), Unsafety::Unsafe, hir::ImplPolarity::Positive)
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| (Unsafety::Normal, None, Unsafety::Normal, _) => {
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// OK
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}
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for id in tcx.hir().items() {
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if matches!(tcx.hir().def_kind(id.def_id), DefKind::Impl) {
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let item = tcx.hir().item(id);
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if let hir::ItemKind::Impl(ref impl_) = item.kind {
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check_unsafety_coherence(
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tcx,
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item,
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Some(&impl_.generics),
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impl_.unsafety,
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impl_.polarity,
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);
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}
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}
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}
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}
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impl<'tcx> ItemLikeVisitor<'_> for UnsafetyChecker<'tcx> {
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fn visit_item(&mut self, item: &hir::Item<'_>) {
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if let hir::ItemKind::Impl(ref impl_) = item.kind {
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self.check_unsafety_coherence(
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item,
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Some(&impl_.generics),
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impl_.unsafety,
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impl_.polarity,
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);
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fn check_unsafety_coherence<'tcx>(
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tcx: TyCtxt<'tcx>,
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item: &hir::Item<'_>,
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impl_generics: Option<&hir::Generics<'_>>,
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unsafety: hir::Unsafety,
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polarity: hir::ImplPolarity,
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) {
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if let Some(trait_ref) = tcx.impl_trait_ref(item.def_id) {
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let trait_def = tcx.trait_def(trait_ref.def_id);
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let unsafe_attr = impl_generics.and_then(|generics| {
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generics.params.iter().find(|p| p.pure_wrt_drop).map(|_| "may_dangle")
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});
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match (trait_def.unsafety, unsafe_attr, unsafety, polarity) {
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(Unsafety::Normal, None, Unsafety::Unsafe, hir::ImplPolarity::Positive) => {
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struct_span_err!(
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tcx.sess,
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item.span,
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E0199,
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"implementing the trait `{}` is not unsafe",
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trait_ref.print_only_trait_path()
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)
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.emit();
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}
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(Unsafety::Unsafe, _, Unsafety::Normal, hir::ImplPolarity::Positive) => {
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struct_span_err!(
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tcx.sess,
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item.span,
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E0200,
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"the trait `{}` requires an `unsafe impl` declaration",
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trait_ref.print_only_trait_path()
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)
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.emit();
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}
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(Unsafety::Normal, Some(attr_name), Unsafety::Normal, hir::ImplPolarity::Positive) => {
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struct_span_err!(
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tcx.sess,
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item.span,
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E0569,
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"requires an `unsafe impl` declaration due to `#[{}]` attribute",
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attr_name
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)
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.emit();
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}
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(_, _, Unsafety::Unsafe, hir::ImplPolarity::Negative(_)) => {
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// Reported in AST validation
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tcx.sess.delay_span_bug(item.span, "unsafe negative impl");
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}
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(_, _, Unsafety::Normal, hir::ImplPolarity::Negative(_))
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| (Unsafety::Unsafe, _, Unsafety::Unsafe, hir::ImplPolarity::Positive)
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| (Unsafety::Normal, Some(_), Unsafety::Unsafe, hir::ImplPolarity::Positive)
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| (Unsafety::Normal, None, Unsafety::Normal, _) => {
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// OK
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}
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}
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}
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fn visit_trait_item(&mut self, _trait_item: &hir::TraitItem<'_>) {}
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fn visit_impl_item(&mut self, _impl_item: &hir::ImplItem<'_>) {}
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fn visit_foreign_item(&mut self, _foreign_item: &hir::ForeignItem<'_>) {}
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}
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// struct UnsafetyChecker<'tcx> {
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// tcx: TyCtxt<'tcx>,
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// }
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//
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// impl<'tcx> UnsafetyChecker<'tcx> {
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// fn check_unsafety_coherence(
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// &mut self,
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// item: &hir::Item<'_>,
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// impl_generics: Option<&hir::Generics<'_>>,
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// unsafety: hir::Unsafety,
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// polarity: hir::ImplPolarity,
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// ) {
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// if let Some(trait_ref) = self.tcx.impl_trait_ref(item.def_id) {
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// let trait_def = self.tcx.trait_def(trait_ref.def_id);
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// let unsafe_attr = impl_generics.and_then(|generics| {
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// generics.params.iter().find(|p| p.pure_wrt_drop).map(|_| "may_dangle")
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// });
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// match (trait_def.unsafety, unsafe_attr, unsafety, polarity) {
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// (Unsafety::Normal, None, Unsafety::Unsafe, hir::ImplPolarity::Positive) => {
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// struct_span_err!(
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// self.tcx.sess,
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// item.span,
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// E0199,
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// "implementing the trait `{}` is not unsafe",
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// trait_ref.print_only_trait_path()
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// )
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// .emit();
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// }
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//
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// (Unsafety::Unsafe, _, Unsafety::Normal, hir::ImplPolarity::Positive) => {
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// struct_span_err!(
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// self.tcx.sess,
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// item.span,
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// E0200,
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// "the trait `{}` requires an `unsafe impl` declaration",
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// trait_ref.print_only_trait_path()
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// )
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// .emit();
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// }
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//
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// (
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// Unsafety::Normal,
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// Some(attr_name),
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// Unsafety::Normal,
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// hir::ImplPolarity::Positive,
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// ) => {
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// struct_span_err!(
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// self.tcx.sess,
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// item.span,
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// E0569,
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// "requires an `unsafe impl` declaration due to `#[{}]` attribute",
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// attr_name
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// )
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// .emit();
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// }
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//
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// (_, _, Unsafety::Unsafe, hir::ImplPolarity::Negative(_)) => {
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// // Reported in AST validation
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// self.tcx.sess.delay_span_bug(item.span, "unsafe negative impl");
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// }
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// (_, _, Unsafety::Normal, hir::ImplPolarity::Negative(_))
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// | (Unsafety::Unsafe, _, Unsafety::Unsafe, hir::ImplPolarity::Positive)
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// | (Unsafety::Normal, Some(_), Unsafety::Unsafe, hir::ImplPolarity::Positive)
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// | (Unsafety::Normal, None, Unsafety::Normal, _) => {
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// // OK
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// }
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// }
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// }
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// }
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// }
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