diff options
Diffstat (limited to 'compiler/rustc_ty_utils/src/ty.rs')
| -rw-r--r-- | compiler/rustc_ty_utils/src/ty.rs | 165 |
1 files changed, 16 insertions, 149 deletions
diff --git a/compiler/rustc_ty_utils/src/ty.rs b/compiler/rustc_ty_utils/src/ty.rs index 65dc3c39c..6e5c50492 100644 --- a/compiler/rustc_ty_utils/src/ty.rs +++ b/compiler/rustc_ty_utils/src/ty.rs @@ -1,13 +1,11 @@ -use rustc_data_structures::fx::{FxHashSet, FxIndexSet}; +use rustc_data_structures::fx::FxHashSet; use rustc_hir as hir; use rustc_hir::def::DefKind; use rustc_index::bit_set::BitSet; use rustc_middle::query::Providers; use rustc_middle::ty::{ - self, Binder, EarlyBinder, ImplTraitInTraitData, Predicate, PredicateKind, ToPredicate, Ty, - TyCtxt, TypeSuperVisitable, TypeVisitable, TypeVisitor, + self, EarlyBinder, ToPredicate, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable, TypeVisitor, }; -use rustc_session::config::TraitSolver; use rustc_span::def_id::{DefId, LocalDefId, CRATE_DEF_ID}; use rustc_span::DUMMY_SP; use rustc_trait_selection::traits; @@ -44,9 +42,7 @@ fn sized_constraint_for_ty<'tcx>( let adt_tys = adt.sized_constraint(tcx); debug!("sized_constraint_for_ty({:?}) intermediate = {:?}", ty, adt_tys); adt_tys - .0 - .iter() - .map(|ty| adt_tys.rebind(*ty).subst(tcx, substs)) + .subst_iter_copied(tcx, substs) .flat_map(|ty| sized_constraint_for_ty(tcx, adtdef, ty)) .collect() } @@ -77,13 +73,13 @@ fn sized_constraint_for_ty<'tcx>( result } -fn impl_defaultness(tcx: TyCtxt<'_>, def_id: LocalDefId) -> hir::Defaultness { +fn defaultness(tcx: TyCtxt<'_>, def_id: LocalDefId) -> hir::Defaultness { match tcx.hir().get_by_def_id(def_id) { hir::Node::Item(hir::Item { kind: hir::ItemKind::Impl(impl_), .. }) => impl_.defaultness, hir::Node::ImplItem(hir::ImplItem { defaultness, .. }) | hir::Node::TraitItem(hir::TraitItem { defaultness, .. }) => *defaultness, node => { - bug!("`impl_defaultness` called on {:?}", node); + bug!("`defaultness` called on {:?}", node); } } } @@ -99,7 +95,7 @@ fn impl_defaultness(tcx: TyCtxt<'_>, def_id: LocalDefId) -> hir::Defaultness { fn adt_sized_constraint(tcx: TyCtxt<'_>, def_id: DefId) -> &[Ty<'_>] { if let Some(def_id) = def_id.as_local() { if matches!(tcx.representability(def_id), ty::Representability::Infinite) { - return tcx.mk_type_list(&[tcx.ty_error_misc()]); + return tcx.mk_type_list(&[Ty::new_misc_error(tcx)]); } } let def = tcx.adt_def(def_id); @@ -107,7 +103,7 @@ fn adt_sized_constraint(tcx: TyCtxt<'_>, def_id: DefId) -> &[Ty<'_>] { let result = tcx.mk_type_list_from_iter( def.variants() .iter() - .filter_map(|v| v.fields.raw.last()) + .filter_map(|v| v.tail_opt()) .flat_map(|f| sized_constraint_for_ty(tcx, def, tcx.type_of(f.did).subst_identity())), ); @@ -122,20 +118,6 @@ fn param_env(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamEnv<'_> { let ty::InstantiatedPredicates { mut predicates, .. } = tcx.predicates_of(def_id).instantiate_identity(tcx); - // When computing the param_env of an RPITIT, use predicates of the containing function, - // *except* for the additional assumption that the RPITIT normalizes to the trait method's - // default opaque type. This is needed to properly check the item bounds of the assoc - // type hold (`check_type_bounds`), since that method already installs a similar projection - // bound, so they will conflict. - // FIXME(-Zlower-impl-trait-in-trait-to-assoc-ty): I don't like this, we should - // at least be making sure that the generics in RPITITs and their parent fn don't - // get out of alignment, or else we do actually need to substitute these predicates. - if let Some(ImplTraitInTraitData::Trait { fn_def_id, .. }) - | Some(ImplTraitInTraitData::Impl { fn_def_id, .. }) = tcx.opt_rpitit_info(def_id) - { - predicates = tcx.predicates_of(fn_def_id).instantiate_identity(tcx).predicates; - } - // Finally, we have to normalize the bounds in the environment, in // case they contain any associated type projections. This process // can yield errors if the put in illegal associated types, like @@ -148,11 +130,6 @@ fn param_env(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamEnv<'_> { // are any errors at that point, so outside of type inference you can be // sure that this will succeed without errors anyway. - if tcx.sess.opts.unstable_opts.trait_solver == TraitSolver::Chalk { - let environment = well_formed_types_in_env(tcx, def_id); - predicates.extend(environment); - } - if tcx.def_kind(def_id) == DefKind::AssocFn && tcx.associated_item(def_id).container == ty::AssocItemContainer::TraitContainer { @@ -188,6 +165,7 @@ fn param_env(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamEnv<'_> { kind: hir::TraitItemKind::Const(..), .. }) | hir::Node::AnonConst(_) + | hir::Node::ConstBlock(_) | hir::Node::ImplItem(hir::ImplItem { kind: hir::ImplItemKind::Const(..), .. }) | hir::Node::ImplItem(hir::ImplItem { kind: @@ -246,7 +224,7 @@ fn param_env(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamEnv<'_> { }; let unnormalized_env = - ty::ParamEnv::new(tcx.mk_predicates(&predicates), traits::Reveal::UserFacing, constness); + ty::ParamEnv::new(tcx.mk_clauses(&predicates), traits::Reveal::UserFacing, constness); let body_id = local_did.unwrap_or(CRATE_DEF_ID); let cause = traits::ObligationCause::misc(tcx.def_span(def_id), body_id); @@ -259,7 +237,7 @@ fn param_env(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamEnv<'_> { /// its corresponding opaque within the body of a default-body trait method. struct ImplTraitInTraitFinder<'a, 'tcx> { tcx: TyCtxt<'tcx>, - predicates: &'a mut Vec<Predicate<'tcx>>, + predicates: &'a mut Vec<ty::Clause<'tcx>>, fn_def_id: DefId, bound_vars: &'tcx ty::List<ty::BoundVariableKind>, seen: FxHashSet<DefId>, @@ -289,12 +267,13 @@ impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for ImplTraitInTraitFinder<'_, 'tcx> { let shifted_alias_ty = self.tcx.fold_regions(unshifted_alias_ty, |re, depth| { if let ty::ReLateBound(index, bv) = re.kind() { if depth != ty::INNERMOST { - return self.tcx.mk_re_error_with_message( + return ty::Region::new_error_with_message( + self.tcx, DUMMY_SP, "we shouldn't walk non-predicate binders with `impl Trait`...", ); } - self.tcx.mk_re_late_bound(index.shifted_out_to_binder(self.depth), bv) + ty::Region::new_late_bound(self.tcx, index.shifted_out_to_binder(self.depth), bv) } else { re } @@ -306,7 +285,7 @@ impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for ImplTraitInTraitFinder<'_, 'tcx> { let default_ty = if self.tcx.lower_impl_trait_in_trait_to_assoc_ty() { self.tcx.type_of(shifted_alias_ty.def_id).subst(self.tcx, shifted_alias_ty.substs) } else { - self.tcx.mk_alias(ty::Opaque, shifted_alias_ty) + Ty::new_alias(self.tcx,ty::Opaque, shifted_alias_ty) }; self.predicates.push( @@ -334,118 +313,6 @@ impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for ImplTraitInTraitFinder<'_, 'tcx> { } } -/// Elaborate the environment. -/// -/// Collect a list of `Predicate`'s used for building the `ParamEnv`. Adds `TypeWellFormedFromEnv`'s -/// that are assumed to be well-formed (because they come from the environment). -/// -/// Used only in chalk mode. -fn well_formed_types_in_env(tcx: TyCtxt<'_>, def_id: DefId) -> &ty::List<Predicate<'_>> { - use rustc_hir::{ForeignItemKind, ImplItemKind, ItemKind, Node, TraitItemKind}; - use rustc_middle::ty::subst::GenericArgKind; - - debug!("environment(def_id = {:?})", def_id); - - // The environment of an impl Trait type is its defining function's environment. - if let Some(parent) = ty::is_impl_trait_defn(tcx, def_id) { - return well_formed_types_in_env(tcx, parent.to_def_id()); - } - - // Compute the bounds on `Self` and the type parameters. - let ty::InstantiatedPredicates { predicates, .. } = - tcx.predicates_of(def_id).instantiate_identity(tcx); - - let clauses = predicates.into_iter(); - - if !def_id.is_local() { - return ty::List::empty(); - } - let node = tcx.hir().get_by_def_id(def_id.expect_local()); - - enum NodeKind { - TraitImpl, - InherentImpl, - Fn, - Other, - } - - let node_kind = match node { - Node::TraitItem(item) => match item.kind { - TraitItemKind::Fn(..) => NodeKind::Fn, - _ => NodeKind::Other, - }, - - Node::ImplItem(item) => match item.kind { - ImplItemKind::Fn(..) => NodeKind::Fn, - _ => NodeKind::Other, - }, - - Node::Item(item) => match item.kind { - ItemKind::Impl(hir::Impl { of_trait: Some(_), .. }) => NodeKind::TraitImpl, - ItemKind::Impl(hir::Impl { of_trait: None, .. }) => NodeKind::InherentImpl, - ItemKind::Fn(..) => NodeKind::Fn, - _ => NodeKind::Other, - }, - - Node::ForeignItem(item) => match item.kind { - ForeignItemKind::Fn(..) => NodeKind::Fn, - _ => NodeKind::Other, - }, - - // FIXME: closures? - _ => NodeKind::Other, - }; - - // FIXME(eddyb) isn't the unordered nature of this a hazard? - let mut inputs = FxIndexSet::default(); - - match node_kind { - // In a trait impl, we assume that the header trait ref and all its - // constituents are well-formed. - NodeKind::TraitImpl => { - let trait_ref = tcx.impl_trait_ref(def_id).expect("not an impl").subst_identity(); - - // FIXME(chalk): this has problems because of late-bound regions - //inputs.extend(trait_ref.substs.iter().flat_map(|arg| arg.walk())); - inputs.extend(trait_ref.substs.iter()); - } - - // In an inherent impl, we assume that the receiver type and all its - // constituents are well-formed. - NodeKind::InherentImpl => { - let self_ty = tcx.type_of(def_id).subst_identity(); - inputs.extend(self_ty.walk()); - } - - // In an fn, we assume that the arguments and all their constituents are - // well-formed. - NodeKind::Fn => { - let fn_sig = tcx.fn_sig(def_id).subst_identity(); - let fn_sig = tcx.liberate_late_bound_regions(def_id, fn_sig); - - inputs.extend(fn_sig.inputs().iter().flat_map(|ty| ty.walk())); - } - - NodeKind::Other => (), - } - let input_clauses = inputs.into_iter().filter_map(|arg| { - match arg.unpack() { - GenericArgKind::Type(ty) => { - let binder = Binder::dummy(PredicateKind::TypeWellFormedFromEnv(ty)); - Some(tcx.mk_predicate(binder)) - } - - // FIXME(eddyb) no WF conditions from lifetimes? - GenericArgKind::Lifetime(_) => None, - - // FIXME(eddyb) support const generics in Chalk - GenericArgKind::Const(_) => None, - } - }); - - tcx.mk_predicates_from_iter(clauses.chain(input_clauses)) -} - fn param_env_reveal_all_normalized(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamEnv<'_> { tcx.param_env(def_id).with_reveal_all_normalized(tcx) } @@ -508,7 +375,7 @@ fn issue33140_self_ty(tcx: TyCtxt<'_>, def_id: DefId) -> Option<EarlyBinder<Ty<' if self_ty_matches { debug!("issue33140_self_ty - MATCHES!"); - Some(EarlyBinder(self_ty)) + Some(EarlyBinder::bind(self_ty)) } else { debug!("issue33140_self_ty - non-matching self type"); None @@ -575,7 +442,7 @@ pub fn provide(providers: &mut Providers) { param_env_reveal_all_normalized, instance_def_size_estimate, issue33140_self_ty, - impl_defaultness, + defaultness, unsizing_params_for_adt, ..*providers }; |