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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:03:36 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:03:36 +0000 |
commit | 17d40c6057c88f4c432b0d7bac88e1b84cb7e67f (patch) | |
tree | 3f66c4a5918660bb8a758ab6cda5ff8ee4f6cdcd /compiler/rustc_borrowck/src/type_check/constraint_conversion.rs | |
parent | Adding upstream version 1.64.0+dfsg1. (diff) | |
download | rustc-17d40c6057c88f4c432b0d7bac88e1b84cb7e67f.tar.xz rustc-17d40c6057c88f4c432b0d7bac88e1b84cb7e67f.zip |
Adding upstream version 1.65.0+dfsg1.upstream/1.65.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | compiler/rustc_borrowck/src/type_check/constraint_conversion.rs | 69 |
1 files changed, 45 insertions, 24 deletions
diff --git a/compiler/rustc_borrowck/src/type_check/constraint_conversion.rs b/compiler/rustc_borrowck/src/type_check/constraint_conversion.rs index 167960918..71eae0583 100644 --- a/compiler/rustc_borrowck/src/type_check/constraint_conversion.rs +++ b/compiler/rustc_borrowck/src/type_check/constraint_conversion.rs @@ -6,7 +6,7 @@ use rustc_infer::infer::region_constraints::{GenericKind, VerifyBound}; use rustc_infer::infer::{self, InferCtxt, SubregionOrigin}; use rustc_middle::mir::ConstraintCategory; use rustc_middle::ty::subst::GenericArgKind; -use rustc_middle::ty::TypeVisitable; +use rustc_middle::ty::TypeFoldable; use rustc_middle::ty::{self, TyCtxt}; use rustc_span::{Span, DUMMY_SP}; @@ -86,7 +86,7 @@ impl<'a, 'tcx> ConstraintConversion<'a, 'tcx> { } } - pub(super) fn convert(&mut self, query_constraint: &QueryOutlivesConstraint<'tcx>) { + fn convert(&mut self, query_constraint: &QueryOutlivesConstraint<'tcx>) { debug!("generate: constraints at: {:#?}", self.locations); // Extract out various useful fields we'll need below. @@ -98,34 +98,25 @@ impl<'a, 'tcx> ConstraintConversion<'a, 'tcx> { // region constraints like `for<'a> 'a: 'b`. At some point // when we move to universes, we will, and this assertion // will start to fail. - let ty::OutlivesPredicate(k1, r2) = query_constraint.no_bound_vars().unwrap_or_else(|| { - bug!("query_constraint {:?} contained bound vars", query_constraint,); - }); + let ty::OutlivesPredicate(k1, r2) = + query_constraint.0.no_bound_vars().unwrap_or_else(|| { + bug!("query_constraint {:?} contained bound vars", query_constraint,); + }); + + let constraint_category = query_constraint.1; match k1.unpack() { GenericArgKind::Lifetime(r1) => { let r1_vid = self.to_region_vid(r1); let r2_vid = self.to_region_vid(r2); - self.add_outlives(r1_vid, r2_vid); + self.add_outlives(r1_vid, r2_vid, constraint_category); } - GenericArgKind::Type(mut t1) => { + GenericArgKind::Type(t1) => { // we don't actually use this for anything, but // the `TypeOutlives` code needs an origin. let origin = infer::RelateParamBound(DUMMY_SP, t1, None); - // Placeholder regions need to be converted now because it may - // create new region variables, which can't be done later when - // verifying these bounds. - if t1.has_placeholders() { - t1 = tcx.fold_regions(t1, |r, _| match *r { - ty::RePlaceholder(placeholder) => { - self.constraints.placeholder_region(self.infcx, placeholder) - } - _ => r, - }); - } - TypeOutlives::new( &mut *self, tcx, @@ -133,7 +124,7 @@ impl<'a, 'tcx> ConstraintConversion<'a, 'tcx> { Some(implicit_region_bound), param_env, ) - .type_must_outlive(origin, t1, r2); + .type_must_outlive(origin, t1, r2, constraint_category); } GenericArgKind::Const(_) => { @@ -143,6 +134,25 @@ impl<'a, 'tcx> ConstraintConversion<'a, 'tcx> { } } + /// Placeholder regions need to be converted eagerly because it may + /// create new region variables, which we must not do when verifying + /// our region bounds. + /// + /// FIXME: This should get removed once higher ranked region obligations + /// are dealt with during trait solving. + fn replace_placeholders_with_nll<T: TypeFoldable<'tcx>>(&mut self, value: T) -> T { + if value.has_placeholders() { + self.tcx.fold_regions(value, |r, _| match *r { + ty::RePlaceholder(placeholder) => { + self.constraints.placeholder_region(self.infcx, placeholder) + } + _ => r, + }) + } else { + value + } + } + fn verify_to_type_test( &mut self, generic_kind: GenericKind<'tcx>, @@ -150,7 +160,6 @@ impl<'a, 'tcx> ConstraintConversion<'a, 'tcx> { verify_bound: VerifyBound<'tcx>, ) -> TypeTest<'tcx> { let lower_bound = self.to_region_vid(region); - TypeTest { generic_kind, lower_bound, locations: self.locations, verify_bound } } @@ -162,10 +171,19 @@ impl<'a, 'tcx> ConstraintConversion<'a, 'tcx> { } } - fn add_outlives(&mut self, sup: ty::RegionVid, sub: ty::RegionVid) { + fn add_outlives( + &mut self, + sup: ty::RegionVid, + sub: ty::RegionVid, + category: ConstraintCategory<'tcx>, + ) { + let category = match self.category { + ConstraintCategory::Boring | ConstraintCategory::BoringNoLocation => category, + _ => self.category, + }; self.constraints.outlives_constraints.push(OutlivesConstraint { locations: self.locations, - category: self.category, + category, span: self.span, sub, sup, @@ -185,10 +203,11 @@ impl<'a, 'b, 'tcx> TypeOutlivesDelegate<'tcx> for &'a mut ConstraintConversion<' _origin: SubregionOrigin<'tcx>, a: ty::Region<'tcx>, b: ty::Region<'tcx>, + constraint_category: ConstraintCategory<'tcx>, ) { let b = self.to_region_vid(b); let a = self.to_region_vid(a); - self.add_outlives(b, a); + self.add_outlives(b, a, constraint_category); } fn push_verify( @@ -198,6 +217,8 @@ impl<'a, 'b, 'tcx> TypeOutlivesDelegate<'tcx> for &'a mut ConstraintConversion<' a: ty::Region<'tcx>, bound: VerifyBound<'tcx>, ) { + let kind = self.replace_placeholders_with_nll(kind); + let bound = self.replace_placeholders_with_nll(bound); let type_test = self.verify_to_type_test(kind, a, bound); self.add_type_test(type_test); } |