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Add helper to create the trait ref for a lang item

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This commit is contained in:
Oli Scherer 2022-11-17 14:39:19 +00:00
parent 25c4760b5d
commit ad57f88d3f
10 changed files with 51 additions and 66 deletions
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37
compiler/rustc_borrowck/src/type_check/mod.rs
View File

@ -547,11 +547,7 @@ fn sanitize_place(
if let PlaceContext::NonMutatingUse(NonMutatingUseContext::Copy) = context {
let tcx = self.tcx();
let trait_ref = tcx.mk_trait_ref(
tcx.require_lang_item(LangItem::Copy, Some(self.last_span)),
place_ty.ty,
[],
);
let trait_ref = tcx.at(self.last_span).mk_trait_ref(LangItem::Copy, place_ty.ty, []);
// To have a `Copy` operand, the type `T` of the
// value must be `Copy`. Note that we prove that `T: Copy`,
@ -1274,11 +1270,8 @@ fn check_stmt(&mut self, body: &Body<'tcx>, stmt: &Statement<'tcx>, location: Lo
self.check_rvalue(body, rv, location);
if !self.unsized_feature_enabled() {
let trait_ref = tcx.mk_trait_ref(
tcx.require_lang_item(LangItem::Sized, Some(self.last_span)),
place_ty,
[],
);
let trait_ref =
tcx.at(self.last_span).mk_trait_ref(LangItem::Sized, place_ty, []);
self.prove_trait_ref(
trait_ref,
location.to_locations(),
@ -1842,6 +1835,7 @@ fn check_operand(&mut self, op: &Operand<'tcx>, location: Location) {
#[instrument(skip(self, body), level = "debug")]
fn check_rvalue(&mut self, body: &Body<'tcx>, rvalue: &Rvalue<'tcx>, location: Location) {
let tcx = self.tcx();
let span = body.source_info(location).span;
match rvalue {
Rvalue::Aggregate(ak, ops) => {
@ -1865,13 +1859,8 @@ fn check_rvalue(&mut self, body: &Body<'tcx>, rvalue: &Rvalue<'tcx>, location: L
}
Operand::Move(place) => {
// Make sure that repeated elements implement `Copy`.
let span = body.source_info(location).span;
let ty = place.ty(body, tcx).ty;
let trait_ref = tcx.mk_trait_ref(
tcx.require_lang_item(LangItem::Copy, Some(span)),
ty,
[],
);
let trait_ref = tcx.at(span).mk_trait_ref(LangItem::Copy, ty, []);
self.prove_trait_ref(
trait_ref,
@ -1884,11 +1873,7 @@ fn check_rvalue(&mut self, body: &Body<'tcx>, rvalue: &Rvalue<'tcx>, location: L
}
&Rvalue::NullaryOp(NullOp::SizeOf | NullOp::AlignOf, ty) => {
let trait_ref = tcx.mk_trait_ref(
tcx.require_lang_item(LangItem::Sized, Some(self.last_span)),
ty,
[],
);
let trait_ref = tcx.at(span).mk_trait_ref(LangItem::Sized, ty, []);
self.prove_trait_ref(
trait_ref,
@ -1900,11 +1885,7 @@ fn check_rvalue(&mut self, body: &Body<'tcx>, rvalue: &Rvalue<'tcx>, location: L
Rvalue::ShallowInitBox(operand, ty) => {
self.check_operand(operand, location);
let trait_ref = tcx.mk_trait_ref(
tcx.require_lang_item(LangItem::Sized, Some(self.last_span)),
*ty,
[],
);
let trait_ref = tcx.at(span).mk_trait_ref(LangItem::Sized, *ty, []);
self.prove_trait_ref(
trait_ref,
@ -2001,8 +1982,8 @@ fn check_rvalue(&mut self, body: &Body<'tcx>, rvalue: &Rvalue<'tcx>, location: L
CastKind::Pointer(PointerCast::Unsize) => {
let &ty = ty;
let trait_ref = tcx.mk_trait_ref(
tcx.require_lang_item(LangItem::CoerceUnsized, Some(self.last_span)),
let trait_ref = tcx.at(span).mk_trait_ref(
LangItem::CoerceUnsized,
op.ty(body, tcx),
[ty.into()],
);

6
compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs
View File

@ -153,14 +153,12 @@ fn in_any_value_of_ty<'tcx>(cx: &ConstCx<'_, 'tcx>, ty: Ty<'tcx>) -> bool {
return false;
}
let destruct = cx.tcx.require_lang_item(LangItem::Destruct, None);
let obligation = Obligation::new(
cx.tcx,
ObligationCause::dummy(),
ObligationCause::dummy_with_span(cx.body.span),
cx.param_env,
ty::Binder::dummy(ty::TraitPredicate {
trait_ref: cx.tcx.mk_trait_ref(destruct, ty, []),
trait_ref: cx.tcx.at(cx.body.span).mk_trait_ref(LangItem::Destruct, ty, []),
constness: ty::BoundConstness::ConstIfConst,
polarity: ty::ImplPolarity::Positive,
}),

6
compiler/rustc_hir_analysis/src/bounds.rs
View File

@ -60,10 +60,10 @@ pub fn predicates<'out, 's>(
{
// If it could be sized, and is, add the `Sized` predicate.
let sized_predicate = self.implicitly_sized.and_then(|span| {
tcx.lang_items().sized_trait().map(move |sized| {
// FIXME: use tcx.at(span).mk_trait_ref(LangItem::Sized) here? This may make no-core code harder to write.
let sized = tcx.lang_items().sized_trait()?;
let trait_ref = ty::Binder::dummy(tcx.mk_trait_ref(sized, param_ty, []));
(trait_ref.without_const().to_predicate(tcx), span)
})
Some((trait_ref.without_const().to_predicate(tcx), span))
});
let region_preds = self.region_bounds.iter().map(move |&(region_bound, span)| {

2
compiler/rustc_hir_analysis/src/check/wfcheck.rs
View File

@ -1722,7 +1722,7 @@ fn receiver_is_valid<'tcx>(
// The first type is `receiver_ty`, which we know its not equal to `self_ty`; skip it.
autoderef.next();
let receiver_trait_def_id = tcx.require_lang_item(LangItem::Receiver, None);
let receiver_trait_def_id = tcx.require_lang_item(LangItem::Receiver, Some(span));
// Keep dereferencing `receiver_ty` until we get to `self_ty`.
loop {

10
compiler/rustc_middle/src/ty/context.rs
View File

@ -2990,6 +2990,16 @@ pub fn ty_error(self) -> Ty<'tcx> {
pub fn ty_error_with_message(self, msg: &str) -> Ty<'tcx> {
self.tcx.ty_error_with_message(self.span, msg)
}
pub fn mk_trait_ref(
self,
trait_lang_item: LangItem,
self_ty: Ty<'tcx>,
rest: impl IntoIterator<Item = ty::GenericArg<'tcx>, IntoIter: ExactSizeIterator>,
) -> ty::TraitRef<'tcx> {
let trait_def_id = self.require_lang_item(trait_lang_item, Some(self.span));
self.tcx.mk_trait_ref(trait_def_id, self_ty, rest)
}
}
/// Parameter attributes that can only be determined by examining the body of a function instead

11
compiler/rustc_monomorphize/src/collector.rs
View File

@ -187,6 +187,7 @@
use rustc_middle::mir::{self, Local, Location};
use rustc_middle::ty::adjustment::{CustomCoerceUnsized, PointerCast};
use rustc_middle::ty::print::with_no_trimmed_paths;
use rustc_middle::ty::query::TyCtxtAt;
use rustc_middle::ty::subst::{GenericArgKind, InternalSubsts};
use rustc_middle::ty::{
self, GenericParamDefKind, Instance, Ty, TyCtxt, TypeFoldable, TypeVisitable, VtblEntry,
@ -688,7 +689,7 @@ fn visit_rvalue(&mut self, rvalue: &mir::Rvalue<'tcx>, location: Location) {
let source_ty = operand.ty(self.body, self.tcx);
let source_ty = self.monomorphize(source_ty);
let (source_ty, target_ty) =
find_vtable_types_for_unsizing(self.tcx, source_ty, target_ty);
find_vtable_types_for_unsizing(self.tcx.at(span), source_ty, target_ty);
// This could also be a different Unsize instruction, like
// from a fixed sized array to a slice. But we are only
// interested in things that produce a vtable.
@ -1053,14 +1054,14 @@ fn should_codegen_locally<'tcx>(tcx: TyCtxt<'tcx>, instance: &Instance<'tcx>) ->
/// Finally, there is also the case of custom unsizing coercions, e.g., for
/// smart pointers such as `Rc` and `Arc`.
fn find_vtable_types_for_unsizing<'tcx>(
tcx: TyCtxt<'tcx>,
tcx: TyCtxtAt<'tcx>,
source_ty: Ty<'tcx>,
target_ty: Ty<'tcx>,
) -> (Ty<'tcx>, Ty<'tcx>) {
let ptr_vtable = |inner_source: Ty<'tcx>, inner_target: Ty<'tcx>| {
let param_env = ty::ParamEnv::reveal_all();
let type_has_metadata = |ty: Ty<'tcx>| -> bool {
if ty.is_sized(tcx, param_env) {
if ty.is_sized(tcx.tcx, param_env) {
return false;
}
let tail = tcx.struct_tail_erasing_lifetimes(ty, param_env);
@ -1104,8 +1105,8 @@ fn find_vtable_types_for_unsizing<'tcx>(
find_vtable_types_for_unsizing(
tcx,
source_fields[coerce_index].ty(tcx, source_substs),
target_fields[coerce_index].ty(tcx, target_substs),
source_fields[coerce_index].ty(*tcx, source_substs),
target_fields[coerce_index].ty(*tcx, target_substs),
)
}
_ => bug!(

11
compiler/rustc_monomorphize/src/lib.rs
View File

@ -13,8 +13,8 @@
use rustc_hir::lang_items::LangItem;
use rustc_middle::traits;
use rustc_middle::ty::adjustment::CustomCoerceUnsized;
use rustc_middle::ty::query::Providers;
use rustc_middle::ty::{self, Ty, TyCtxt};
use rustc_middle::ty::query::{Providers, TyCtxtAt};
use rustc_middle::ty::{self, Ty};
mod collector;
mod errors;
@ -23,13 +23,12 @@
mod util;
fn custom_coerce_unsize_info<'tcx>(
tcx: TyCtxt<'tcx>,
tcx: TyCtxtAt<'tcx>,
source_ty: Ty<'tcx>,
target_ty: Ty<'tcx>,
) -> CustomCoerceUnsized {
let def_id = tcx.require_lang_item(LangItem::CoerceUnsized, None);
let trait_ref = ty::Binder::dummy(tcx.mk_trait_ref(def_id, source_ty, [target_ty.into()]));
let trait_ref =
ty::Binder::dummy(tcx.mk_trait_ref(LangItem::CoerceUnsized, source_ty, [target_ty.into()]));
match tcx.codegen_select_candidate((ty::ParamEnv::reveal_all(), trait_ref)) {
Ok(traits::ImplSource::UserDefined(traits::ImplSourceUserDefinedData {

10
compiler/rustc_trait_selection/src/traits/project.rs
View File

@ -1710,8 +1710,8 @@ fn assemble_candidates_from_impls<'cx, 'tcx>(
if selcx.infcx().predicate_must_hold_modulo_regions(
&obligation.with(
selcx.tcx(),
ty::Binder::dummy(selcx.tcx().mk_trait_ref(
selcx.tcx().require_lang_item(LangItem::Sized, None),
ty::Binder::dummy(selcx.tcx().at(obligation.cause.span).mk_trait_ref(
LangItem::Sized,
self_ty, [],
))
.without_const(),
@ -1966,8 +1966,8 @@ fn confirm_pointee_candidate<'cx, 'tcx>(
)
});
if check_is_sized {
let sized_predicate = ty::Binder::dummy(tcx.mk_trait_ref(
tcx.require_lang_item(LangItem::Sized, None),
let sized_predicate = ty::Binder::dummy(tcx.at(obligation.cause.span).mk_trait_ref(
LangItem::Sized,
self_ty,
[],
))
@ -1976,7 +1976,7 @@ fn confirm_pointee_candidate<'cx, 'tcx>(
}
let substs = tcx.mk_substs([self_ty.into()].iter());
let metadata_def_id = tcx.require_lang_item(LangItem::Metadata, None);
let metadata_def_id = tcx.require_lang_item(LangItem::Metadata, Some(obligation.cause.span));
let predicate = ty::ProjectionPredicate {
projection_ty: ty::ProjectionTy { substs, item_def_id: metadata_def_id },

19
compiler/rustc_trait_selection/src/traits/select/confirmation.rs
View File

@ -632,8 +632,8 @@ fn confirm_fn_pointer_candidate(
output_ty,
&mut nested,
);
let tr = ty::Binder::dummy(self.tcx().mk_trait_ref(
self.tcx().require_lang_item(LangItem::Sized, None),
let tr = ty::Binder::dummy(self.tcx().at(cause.span).mk_trait_ref(
LangItem::Sized,
output_ty,
[],
));
@ -997,11 +997,8 @@ fn confirm_builtin_unsize_candidate(
);
// We can only make objects from sized types.
let tr = ty::Binder::dummy(tcx.mk_trait_ref(
tcx.require_lang_item(LangItem::Sized, None),
source,
[],
));
let tr =
ty::Binder::dummy(tcx.at(cause.span).mk_trait_ref(LangItem::Sized, source, []));
nested.push(predicate_to_obligation(tr.without_const().to_predicate(tcx)));
// If the type is `Foo + 'a`, ensure that the type
@ -1255,8 +1252,8 @@ fn confirm_const_destruct_candidate(
cause.clone(),
obligation.recursion_depth + 1,
self_ty.rebind(ty::TraitPredicate {
trait_ref: self.tcx().mk_trait_ref(
self.tcx().require_lang_item(LangItem::Destruct, None),
trait_ref: self.tcx().at(cause.span).mk_trait_ref(
LangItem::Destruct,
nested_ty,
[],
),
@ -1280,8 +1277,8 @@ fn confirm_const_destruct_candidate(
// or it's an ADT (and we need to check for a custom impl during selection)
_ => {
let predicate = self_ty.rebind(ty::TraitPredicate {
trait_ref: self.tcx().mk_trait_ref(
self.tcx().require_lang_item(LangItem::Destruct, None),
trait_ref: self.tcx().at(cause.span).mk_trait_ref(
LangItem::Destruct,
nested_ty,
[],
),

3
compiler/rustc_trait_selection/src/traits/wf.rs
View File

@ -421,8 +421,7 @@ fn compute_projection(&mut self, data: ty::ProjectionTy<'tcx>) {
fn require_sized(&mut self, subty: Ty<'tcx>, cause: traits::ObligationCauseCode<'tcx>) {
if !subty.has_escaping_bound_vars() {
let cause = self.cause(cause);
let trait_ref =
self.tcx.mk_trait_ref(self.tcx.require_lang_item(LangItem::Sized, None), subty, []);
let trait_ref = self.tcx.at(cause.span).mk_trait_ref(LangItem::Sized, subty, []);
self.out.push(traits::Obligation::with_depth(
self.tcx,
cause,