Add helper to create the trait ref for a lang item
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25c4760b5d
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ad57f88d3f
@ -547,11 +547,7 @@ fn sanitize_place(
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if let PlaceContext::NonMutatingUse(NonMutatingUseContext::Copy) = context {
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let tcx = self.tcx();
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let trait_ref = tcx.mk_trait_ref(
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tcx.require_lang_item(LangItem::Copy, Some(self.last_span)),
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place_ty.ty,
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[],
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);
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let trait_ref = tcx.at(self.last_span).mk_trait_ref(LangItem::Copy, place_ty.ty, []);
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// To have a `Copy` operand, the type `T` of the
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// value must be `Copy`. Note that we prove that `T: Copy`,
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@ -1274,11 +1270,8 @@ fn check_stmt(&mut self, body: &Body<'tcx>, stmt: &Statement<'tcx>, location: Lo
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self.check_rvalue(body, rv, location);
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if !self.unsized_feature_enabled() {
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let trait_ref = tcx.mk_trait_ref(
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tcx.require_lang_item(LangItem::Sized, Some(self.last_span)),
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place_ty,
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[],
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);
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let trait_ref =
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tcx.at(self.last_span).mk_trait_ref(LangItem::Sized, place_ty, []);
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self.prove_trait_ref(
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trait_ref,
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location.to_locations(),
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@ -1842,6 +1835,7 @@ fn check_operand(&mut self, op: &Operand<'tcx>, location: Location) {
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#[instrument(skip(self, body), level = "debug")]
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fn check_rvalue(&mut self, body: &Body<'tcx>, rvalue: &Rvalue<'tcx>, location: Location) {
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let tcx = self.tcx();
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let span = body.source_info(location).span;
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match rvalue {
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Rvalue::Aggregate(ak, ops) => {
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@ -1865,13 +1859,8 @@ fn check_rvalue(&mut self, body: &Body<'tcx>, rvalue: &Rvalue<'tcx>, location: L
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}
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Operand::Move(place) => {
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// Make sure that repeated elements implement `Copy`.
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let span = body.source_info(location).span;
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let ty = place.ty(body, tcx).ty;
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let trait_ref = tcx.mk_trait_ref(
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tcx.require_lang_item(LangItem::Copy, Some(span)),
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ty,
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[],
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);
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let trait_ref = tcx.at(span).mk_trait_ref(LangItem::Copy, ty, []);
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self.prove_trait_ref(
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trait_ref,
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@ -1884,11 +1873,7 @@ fn check_rvalue(&mut self, body: &Body<'tcx>, rvalue: &Rvalue<'tcx>, location: L
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}
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&Rvalue::NullaryOp(NullOp::SizeOf | NullOp::AlignOf, ty) => {
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let trait_ref = tcx.mk_trait_ref(
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tcx.require_lang_item(LangItem::Sized, Some(self.last_span)),
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ty,
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[],
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);
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let trait_ref = tcx.at(span).mk_trait_ref(LangItem::Sized, ty, []);
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self.prove_trait_ref(
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trait_ref,
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@ -1900,11 +1885,7 @@ fn check_rvalue(&mut self, body: &Body<'tcx>, rvalue: &Rvalue<'tcx>, location: L
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Rvalue::ShallowInitBox(operand, ty) => {
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self.check_operand(operand, location);
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let trait_ref = tcx.mk_trait_ref(
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tcx.require_lang_item(LangItem::Sized, Some(self.last_span)),
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*ty,
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[],
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);
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let trait_ref = tcx.at(span).mk_trait_ref(LangItem::Sized, *ty, []);
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self.prove_trait_ref(
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trait_ref,
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@ -2001,8 +1982,8 @@ fn check_rvalue(&mut self, body: &Body<'tcx>, rvalue: &Rvalue<'tcx>, location: L
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CastKind::Pointer(PointerCast::Unsize) => {
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let &ty = ty;
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let trait_ref = tcx.mk_trait_ref(
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tcx.require_lang_item(LangItem::CoerceUnsized, Some(self.last_span)),
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let trait_ref = tcx.at(span).mk_trait_ref(
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LangItem::CoerceUnsized,
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op.ty(body, tcx),
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[ty.into()],
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);
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@ -153,14 +153,12 @@ fn in_any_value_of_ty<'tcx>(cx: &ConstCx<'_, 'tcx>, ty: Ty<'tcx>) -> bool {
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return false;
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}
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let destruct = cx.tcx.require_lang_item(LangItem::Destruct, None);
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let obligation = Obligation::new(
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cx.tcx,
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ObligationCause::dummy(),
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ObligationCause::dummy_with_span(cx.body.span),
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cx.param_env,
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ty::Binder::dummy(ty::TraitPredicate {
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trait_ref: cx.tcx.mk_trait_ref(destruct, ty, []),
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trait_ref: cx.tcx.at(cx.body.span).mk_trait_ref(LangItem::Destruct, ty, []),
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constness: ty::BoundConstness::ConstIfConst,
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polarity: ty::ImplPolarity::Positive,
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}),
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@ -60,10 +60,10 @@ pub fn predicates<'out, 's>(
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{
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// If it could be sized, and is, add the `Sized` predicate.
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let sized_predicate = self.implicitly_sized.and_then(|span| {
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tcx.lang_items().sized_trait().map(move |sized| {
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let trait_ref = ty::Binder::dummy(tcx.mk_trait_ref(sized, param_ty, []));
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(trait_ref.without_const().to_predicate(tcx), span)
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})
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// FIXME: use tcx.at(span).mk_trait_ref(LangItem::Sized) here? This may make no-core code harder to write.
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let sized = tcx.lang_items().sized_trait()?;
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let trait_ref = ty::Binder::dummy(tcx.mk_trait_ref(sized, param_ty, []));
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Some((trait_ref.without_const().to_predicate(tcx), span))
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});
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let region_preds = self.region_bounds.iter().map(move |&(region_bound, span)| {
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@ -1722,7 +1722,7 @@ fn receiver_is_valid<'tcx>(
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// The first type is `receiver_ty`, which we know its not equal to `self_ty`; skip it.
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autoderef.next();
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let receiver_trait_def_id = tcx.require_lang_item(LangItem::Receiver, None);
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let receiver_trait_def_id = tcx.require_lang_item(LangItem::Receiver, Some(span));
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// Keep dereferencing `receiver_ty` until we get to `self_ty`.
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loop {
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@ -2990,6 +2990,16 @@ pub fn ty_error(self) -> Ty<'tcx> {
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pub fn ty_error_with_message(self, msg: &str) -> Ty<'tcx> {
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self.tcx.ty_error_with_message(self.span, msg)
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}
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pub fn mk_trait_ref(
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self,
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trait_lang_item: LangItem,
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self_ty: Ty<'tcx>,
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rest: impl IntoIterator<Item = ty::GenericArg<'tcx>, IntoIter: ExactSizeIterator>,
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) -> ty::TraitRef<'tcx> {
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let trait_def_id = self.require_lang_item(trait_lang_item, Some(self.span));
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self.tcx.mk_trait_ref(trait_def_id, self_ty, rest)
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}
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}
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/// Parameter attributes that can only be determined by examining the body of a function instead
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@ -187,6 +187,7 @@
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use rustc_middle::mir::{self, Local, Location};
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use rustc_middle::ty::adjustment::{CustomCoerceUnsized, PointerCast};
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use rustc_middle::ty::print::with_no_trimmed_paths;
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use rustc_middle::ty::query::TyCtxtAt;
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use rustc_middle::ty::subst::{GenericArgKind, InternalSubsts};
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use rustc_middle::ty::{
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self, GenericParamDefKind, Instance, Ty, TyCtxt, TypeFoldable, TypeVisitable, VtblEntry,
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@ -688,7 +689,7 @@ fn visit_rvalue(&mut self, rvalue: &mir::Rvalue<'tcx>, location: Location) {
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let source_ty = operand.ty(self.body, self.tcx);
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let source_ty = self.monomorphize(source_ty);
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let (source_ty, target_ty) =
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find_vtable_types_for_unsizing(self.tcx, source_ty, target_ty);
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find_vtable_types_for_unsizing(self.tcx.at(span), source_ty, target_ty);
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// This could also be a different Unsize instruction, like
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// from a fixed sized array to a slice. But we are only
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// interested in things that produce a vtable.
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@ -1053,14 +1054,14 @@ fn should_codegen_locally<'tcx>(tcx: TyCtxt<'tcx>, instance: &Instance<'tcx>) ->
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/// Finally, there is also the case of custom unsizing coercions, e.g., for
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/// smart pointers such as `Rc` and `Arc`.
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fn find_vtable_types_for_unsizing<'tcx>(
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tcx: TyCtxt<'tcx>,
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tcx: TyCtxtAt<'tcx>,
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source_ty: Ty<'tcx>,
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target_ty: Ty<'tcx>,
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) -> (Ty<'tcx>, Ty<'tcx>) {
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let ptr_vtable = |inner_source: Ty<'tcx>, inner_target: Ty<'tcx>| {
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let param_env = ty::ParamEnv::reveal_all();
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let type_has_metadata = |ty: Ty<'tcx>| -> bool {
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if ty.is_sized(tcx, param_env) {
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if ty.is_sized(tcx.tcx, param_env) {
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return false;
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}
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let tail = tcx.struct_tail_erasing_lifetimes(ty, param_env);
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@ -1104,8 +1105,8 @@ fn find_vtable_types_for_unsizing<'tcx>(
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find_vtable_types_for_unsizing(
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tcx,
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source_fields[coerce_index].ty(tcx, source_substs),
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target_fields[coerce_index].ty(tcx, target_substs),
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source_fields[coerce_index].ty(*tcx, source_substs),
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target_fields[coerce_index].ty(*tcx, target_substs),
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)
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}
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_ => bug!(
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@ -13,8 +13,8 @@
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use rustc_hir::lang_items::LangItem;
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use rustc_middle::traits;
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use rustc_middle::ty::adjustment::CustomCoerceUnsized;
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use rustc_middle::ty::query::Providers;
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use rustc_middle::ty::{self, Ty, TyCtxt};
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use rustc_middle::ty::query::{Providers, TyCtxtAt};
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use rustc_middle::ty::{self, Ty};
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mod collector;
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mod errors;
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@ -23,13 +23,12 @@
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mod util;
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fn custom_coerce_unsize_info<'tcx>(
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tcx: TyCtxt<'tcx>,
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tcx: TyCtxtAt<'tcx>,
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source_ty: Ty<'tcx>,
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target_ty: Ty<'tcx>,
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) -> CustomCoerceUnsized {
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let def_id = tcx.require_lang_item(LangItem::CoerceUnsized, None);
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let trait_ref = ty::Binder::dummy(tcx.mk_trait_ref(def_id, source_ty, [target_ty.into()]));
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let trait_ref =
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ty::Binder::dummy(tcx.mk_trait_ref(LangItem::CoerceUnsized, source_ty, [target_ty.into()]));
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match tcx.codegen_select_candidate((ty::ParamEnv::reveal_all(), trait_ref)) {
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Ok(traits::ImplSource::UserDefined(traits::ImplSourceUserDefinedData {
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@ -1710,8 +1710,8 @@ fn assemble_candidates_from_impls<'cx, 'tcx>(
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if selcx.infcx().predicate_must_hold_modulo_regions(
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&obligation.with(
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selcx.tcx(),
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ty::Binder::dummy(selcx.tcx().mk_trait_ref(
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selcx.tcx().require_lang_item(LangItem::Sized, None),
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ty::Binder::dummy(selcx.tcx().at(obligation.cause.span).mk_trait_ref(
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LangItem::Sized,
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self_ty, [],
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))
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.without_const(),
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@ -1966,8 +1966,8 @@ fn confirm_pointee_candidate<'cx, 'tcx>(
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)
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});
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if check_is_sized {
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let sized_predicate = ty::Binder::dummy(tcx.mk_trait_ref(
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tcx.require_lang_item(LangItem::Sized, None),
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let sized_predicate = ty::Binder::dummy(tcx.at(obligation.cause.span).mk_trait_ref(
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LangItem::Sized,
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self_ty,
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[],
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))
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@ -1976,7 +1976,7 @@ fn confirm_pointee_candidate<'cx, 'tcx>(
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}
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let substs = tcx.mk_substs([self_ty.into()].iter());
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let metadata_def_id = tcx.require_lang_item(LangItem::Metadata, None);
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let metadata_def_id = tcx.require_lang_item(LangItem::Metadata, Some(obligation.cause.span));
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let predicate = ty::ProjectionPredicate {
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projection_ty: ty::ProjectionTy { substs, item_def_id: metadata_def_id },
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@ -632,8 +632,8 @@ fn confirm_fn_pointer_candidate(
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output_ty,
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&mut nested,
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);
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let tr = ty::Binder::dummy(self.tcx().mk_trait_ref(
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self.tcx().require_lang_item(LangItem::Sized, None),
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let tr = ty::Binder::dummy(self.tcx().at(cause.span).mk_trait_ref(
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LangItem::Sized,
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output_ty,
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[],
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));
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@ -997,11 +997,8 @@ fn confirm_builtin_unsize_candidate(
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);
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// We can only make objects from sized types.
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let tr = ty::Binder::dummy(tcx.mk_trait_ref(
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tcx.require_lang_item(LangItem::Sized, None),
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source,
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[],
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));
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let tr =
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ty::Binder::dummy(tcx.at(cause.span).mk_trait_ref(LangItem::Sized, source, []));
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nested.push(predicate_to_obligation(tr.without_const().to_predicate(tcx)));
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// If the type is `Foo + 'a`, ensure that the type
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@ -1255,8 +1252,8 @@ fn confirm_const_destruct_candidate(
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cause.clone(),
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obligation.recursion_depth + 1,
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self_ty.rebind(ty::TraitPredicate {
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trait_ref: self.tcx().mk_trait_ref(
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self.tcx().require_lang_item(LangItem::Destruct, None),
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trait_ref: self.tcx().at(cause.span).mk_trait_ref(
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LangItem::Destruct,
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nested_ty,
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[],
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),
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@ -1280,8 +1277,8 @@ fn confirm_const_destruct_candidate(
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// or it's an ADT (and we need to check for a custom impl during selection)
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_ => {
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let predicate = self_ty.rebind(ty::TraitPredicate {
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trait_ref: self.tcx().mk_trait_ref(
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self.tcx().require_lang_item(LangItem::Destruct, None),
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trait_ref: self.tcx().at(cause.span).mk_trait_ref(
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LangItem::Destruct,
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nested_ty,
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[],
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),
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@ -421,8 +421,7 @@ fn compute_projection(&mut self, data: ty::ProjectionTy<'tcx>) {
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fn require_sized(&mut self, subty: Ty<'tcx>, cause: traits::ObligationCauseCode<'tcx>) {
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if !subty.has_escaping_bound_vars() {
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let cause = self.cause(cause);
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let trait_ref =
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self.tcx.mk_trait_ref(self.tcx.require_lang_item(LangItem::Sized, None), subty, []);
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let trait_ref = self.tcx.at(cause.span).mk_trait_ref(LangItem::Sized, subty, []);
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self.out.push(traits::Obligation::with_depth(
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self.tcx,
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cause,
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