don't store const var origins for known vars

compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs

@@ -13,7 +13,9 @@ use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::intravisit::{self, Visitor};
 use rustc_hir::{Body, Closure, Expr, ExprKind, FnRetTy, HirId, Local, LocalSource};
 use rustc_middle::hir::nested_filter;
-use rustc_middle::infer::unify_key::{ConstVariableOrigin, ConstVariableOriginKind};
+use rustc_middle::infer::unify_key::{
+    ConstVariableOrigin, ConstVariableOriginKind, ConstVariableValue,
+};
 use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow};
 use rustc_middle::ty::print::{FmtPrinter, PrettyPrinter, Print, Printer};
 use rustc_middle::ty::{self, InferConst};
@@ -178,17 +180,23 @@ fn fmt_printer<'a, 'tcx>(infcx: &'a InferCtxt<'tcx>, ns: Namespace) -> FmtPrinte
         }
     };
     printer.ty_infer_name_resolver = Some(Box::new(ty_getter));
-    let const_getter = move |ct_vid| {
-        if infcx.probe_const_var(ct_vid).is_ok() {
+    let const_getter = move |ct_vid| match infcx
+        .inner
+        .borrow_mut()
+        .const_unification_table()
+        .probe_value(ct_vid)
+    {
+        ConstVariableValue::Known { value: _ } => {
             warn!("resolved const var in error message");
-        }
-        if let ConstVariableOriginKind::ConstParameterDefinition(name, _) =
-            infcx.inner.borrow_mut().const_unification_table().probe_value(ct_vid).origin.kind
-        {
-            return Some(name);
-        } else {
             None
         }
+        ConstVariableValue::Unknown { origin, universe: _ } => {
+            if let ConstVariableOriginKind::ConstParameterDefinition(name, _) = origin.kind {
+                return Some(name);
+            } else {
+                None
+            }
+        }
     };
     printer.const_infer_name_resolver = Some(Box::new(const_getter));
     printer
@@ -303,7 +311,12 @@ impl<'tcx> InferCtxt<'tcx> {
             GenericArgKind::Const(ct) => {
                 if let ty::ConstKind::Infer(InferConst::Var(vid)) = ct.kind() {
                     let origin =
-                        self.inner.borrow_mut().const_unification_table().probe_value(vid).origin;
+                        match self.inner.borrow_mut().const_unification_table().probe_value(vid) {
+                            ConstVariableValue::Known { value } => {
+                                bug!("resolved infer var: {vid:?} {value}")
+                            }
+                            ConstVariableValue::Unknown { origin, universe: _ } => origin,
+                        };
                     if let ConstVariableOriginKind::ConstParameterDefinition(name, def_id) =
                         origin.kind
                     {

compiler/rustc_infer/src/infer/freshen.rs

@@ -146,14 +146,8 @@ impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for TypeFreshener<'a, 'tcx> {
     fn fold_const(&mut self, ct: ty::Const<'tcx>) -> ty::Const<'tcx> {
         match ct.kind() {
             ty::ConstKind::Infer(ty::InferConst::Var(v)) => {
-                let opt_ct = self
-                    .infcx
-                    .inner
-                    .borrow_mut()
-                    .const_unification_table()
-                    .probe_value(v)
-                    .val
-                    .known();
+                let opt_ct =
+                    self.infcx.inner.borrow_mut().const_unification_table().probe_value(v).known();
                 self.freshen_const(opt_ct, ty::InferConst::Var(v), ty::InferConst::Fresh, ct.ty())
             }
             ty::ConstKind::Infer(ty::InferConst::EffectVar(v)) => {

compiler/rustc_infer/src/infer/fudge.rs

@@ -1,4 +1,4 @@
-use rustc_middle::infer::unify_key::ConstVidKey;
+use rustc_middle::infer::unify_key::{ConstVariableOriginKind, ConstVariableValue, ConstVidKey};
 use rustc_middle::ty::fold::{TypeFoldable, TypeFolder, TypeSuperFoldable};
 use rustc_middle::ty::{self, ConstVid, FloatVid, IntVid, RegionVid, Ty, TyCtxt, TyVid};
 
@@ -28,10 +28,17 @@ fn const_vars_since_snapshot<'tcx>(
     snapshot_var_len: usize,
 ) -> (Range<ConstVid>, Vec<ConstVariableOrigin>) {
     let range = vars_since_snapshot(table, snapshot_var_len);
+
     (
         range.start.vid..range.end.vid,
         (range.start.index()..range.end.index())
-            .map(|index| table.probe_value(ConstVid::from_u32(index)).origin)
+            .map(|index| match table.probe_value(ConstVid::from_u32(index)) {
+                ConstVariableValue::Known { value: _ } => ConstVariableOrigin {
+                    kind: ConstVariableOriginKind::MiscVariable,
+                    span: rustc_span::DUMMY_SP,
+                },
+                ConstVariableValue::Unknown { origin, universe: _ } => origin,
+            })
             .collect(),
     )
 }

compiler/rustc_infer/src/infer/mod.rs

@@ -23,8 +23,8 @@ use rustc_data_structures::unify as ut;
 use rustc_errors::{DiagCtxt, DiagnosticBuilder, ErrorGuaranteed};
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_middle::infer::canonical::{Canonical, CanonicalVarValues};
-use rustc_middle::infer::unify_key::{ConstVarValue, ConstVariableValue, EffectVarValue};
 use rustc_middle::infer::unify_key::{ConstVariableOrigin, ConstVariableOriginKind, ToType};
+use rustc_middle::infer::unify_key::{ConstVariableValue, EffectVarValue};
 use rustc_middle::mir::interpret::{ErrorHandled, EvalToValTreeResult};
 use rustc_middle::mir::ConstraintCategory;
 use rustc_middle::traits::{select, DefiningAnchor};
@@ -1086,7 +1086,7 @@ impl<'tcx> InferCtxt<'tcx> {
             .inner
             .borrow_mut()
             .const_unification_table()
-            .new_key(ConstVarValue { origin, val: ConstVariableValue::Unknown { universe } })
+            .new_key(ConstVariableValue::Unknown { origin, universe })
             .vid;
         ty::Const::new_var(self.tcx, vid, ty)
     }
@@ -1095,10 +1095,7 @@ impl<'tcx> InferCtxt<'tcx> {
         self.inner
             .borrow_mut()
             .const_unification_table()
-            .new_key(ConstVarValue {
-                origin,
-                val: ConstVariableValue::Unknown { universe: self.universe() },
-            })
+            .new_key(ConstVariableValue::Unknown { origin, universe: self.universe() })
             .vid
     }
 
@@ -1217,10 +1214,7 @@ impl<'tcx> InferCtxt<'tcx> {
                     .inner
                     .borrow_mut()
                     .const_unification_table()
-                    .new_key(ConstVarValue {
-                        origin,
-                        val: ConstVariableValue::Unknown { universe: self.universe() },
-                    })
+                    .new_key(ConstVariableValue::Unknown { origin, universe: self.universe() })
                     .vid;
                 ty::Const::new_var(
                     self.tcx,
@@ -1410,9 +1404,9 @@ impl<'tcx> InferCtxt<'tcx> {
     }
 
     pub fn probe_const_var(&self, vid: ty::ConstVid) -> Result<ty::Const<'tcx>, ty::UniverseIndex> {
-        match self.inner.borrow_mut().const_unification_table().probe_value(vid).val {
+        match self.inner.borrow_mut().const_unification_table().probe_value(vid) {
             ConstVariableValue::Known { value } => Ok(value),
-            ConstVariableValue::Unknown { universe } => Err(universe),
+            ConstVariableValue::Unknown { origin: _, universe } => Err(universe),
         }
     }
 
@@ -1709,7 +1703,7 @@ impl<'tcx> InferCtxt<'tcx> {
                 // `ty::ConstKind::Infer(ty::InferConst::Var(v))`.
                 //
                 // Not `inlined_probe_value(v)` because this call site is colder.
-                match self.inner.borrow_mut().const_unification_table().probe_value(v).val {
+                match self.inner.borrow_mut().const_unification_table().probe_value(v) {
                     ConstVariableValue::Unknown { .. } => false,
                     ConstVariableValue::Known { .. } => true,
                 }
@@ -1876,7 +1870,6 @@ impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for ShallowResolver<'a, 'tcx> {
                 .borrow_mut()
                 .const_unification_table()
                 .probe_value(vid)
-                .val
                 .known()
                 .unwrap_or(ct),
             ty::ConstKind::Infer(InferConst::EffectVar(vid)) => self

compiler/rustc_infer/src/infer/relate/combine.rs

@@ -30,14 +30,12 @@ use super::sub::Sub;
 use crate::infer::{DefineOpaqueTypes, InferCtxt, TypeTrace};
 use crate::traits::{Obligation, PredicateObligations};
 use rustc_middle::infer::canonical::OriginalQueryValues;
-use rustc_middle::infer::unify_key::{ConstVarValue, ConstVariableValue, EffectVarValue};
-use rustc_middle::infer::unify_key::{ConstVariableOrigin, ConstVariableOriginKind};
+use rustc_middle::infer::unify_key::{ConstVariableValue, EffectVarValue};
 use rustc_middle::ty::error::{ExpectedFound, TypeError};
 use rustc_middle::ty::relate::{RelateResult, TypeRelation};
 use rustc_middle::ty::{self, InferConst, ToPredicate, Ty, TyCtxt, TypeVisitableExt};
 use rustc_middle::ty::{AliasRelationDirection, TyVar};
 use rustc_middle::ty::{IntType, UintType};
-use rustc_span::DUMMY_SP;
 
 #[derive(Clone)]
 pub struct CombineFields<'infcx, 'tcx> {
@@ -328,8 +326,12 @@ impl<'tcx> InferCtxt<'tcx> {
         ct: ty::Const<'tcx>,
         param_env: ty::ParamEnv<'tcx>,
     ) -> RelateResult<'tcx, ty::Const<'tcx>> {
-        let span =
-            self.inner.borrow_mut().const_unification_table().probe_value(target_vid).origin.span;
+        let span = match self.inner.borrow_mut().const_unification_table().probe_value(target_vid) {
+            ConstVariableValue::Known { value } => {
+                bug!("instantiating a known const var: {target_vid:?} {value} {ct}")
+            }
+            ConstVariableValue::Unknown { origin, universe: _ } => origin.span,
+        };
         // FIXME(generic_const_exprs): Occurs check failures for unevaluated
         // constants and generic expressions are not yet handled correctly.
         let Generalization { value_may_be_infer: value, needs_wf: _ } = generalize::generalize(
@@ -340,16 +342,10 @@ impl<'tcx> InferCtxt<'tcx> {
             ty::Variance::Invariant,
         )?;
 
-        self.inner.borrow_mut().const_unification_table().union_value(
-            target_vid,
-            ConstVarValue {
-                origin: ConstVariableOrigin {
-                    kind: ConstVariableOriginKind::ConstInference,
-                    span: DUMMY_SP,
-                },
-                val: ConstVariableValue::Known { value },
-            },
-        );
+        self.inner
+            .borrow_mut()
+            .const_unification_table()
+            .union_value(target_vid, ConstVariableValue::Known { value });
         Ok(value)
     }
 

compiler/rustc_infer/src/infer/relate/generalize.rs

@@ -3,7 +3,7 @@ use std::mem;
 use rustc_data_structures::sso::SsoHashMap;
 use rustc_data_structures::stack::ensure_sufficient_stack;
 use rustc_hir::def_id::DefId;
-use rustc_middle::infer::unify_key::{ConstVarValue, ConstVariableValue};
+use rustc_middle::infer::unify_key::ConstVariableValue;
 use rustc_middle::ty::error::TypeError;
 use rustc_middle::ty::relate::{self, Relate, RelateResult, TypeRelation};
 use rustc_middle::ty::visit::MaxUniverse;
@@ -431,22 +431,19 @@ where
 
                 let mut inner = self.infcx.inner.borrow_mut();
                 let variable_table = &mut inner.const_unification_table();
-                let var_value = variable_table.probe_value(vid);
-                match var_value.val {
+                match variable_table.probe_value(vid) {
                     ConstVariableValue::Known { value: u } => {
                         drop(inner);
                         self.relate(u, u)
                     }
-                    ConstVariableValue::Unknown { universe } => {
+                    ConstVariableValue::Unknown { origin, universe } => {
                         if self.for_universe.can_name(universe) {
                             Ok(c)
                         } else {
                             let new_var_id = variable_table
-                                .new_key(ConstVarValue {
-                                    origin: var_value.origin,
-                                    val: ConstVariableValue::Unknown {
-                                        universe: self.for_universe,
-                                    },
+                                .new_key(ConstVariableValue::Unknown {
+                                    origin,
+                                    universe: self.for_universe,
                                 })
                                 .vid;
                             Ok(ty::Const::new_var(self.tcx(), new_var_id, c.ty()))

compiler/rustc_infer/src/infer/resolve.rs

@@ -1,12 +1,8 @@
-use super::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
-use super::{FixupError, FixupResult, InferCtxt, Span};
-use rustc_middle::infer::unify_key::{ConstVariableOrigin, ConstVariableOriginKind};
+use super::{FixupError, FixupResult, InferCtxt};
 use rustc_middle::ty::fold::{FallibleTypeFolder, TypeFolder, TypeSuperFoldable};
-use rustc_middle::ty::visit::{TypeSuperVisitable, TypeVisitableExt, TypeVisitor};
+use rustc_middle::ty::visit::TypeVisitableExt;
 use rustc_middle::ty::{self, Const, InferConst, Ty, TyCtxt, TypeFoldable};
 
-use std::ops::ControlFlow;
-
 ///////////////////////////////////////////////////////////////////////////
 // OPPORTUNISTIC VAR RESOLVER
 
@@ -104,88 +100,6 @@ impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for OpportunisticRegionResolver<'a, 'tcx
     }
 }
 
-///////////////////////////////////////////////////////////////////////////
-// UNRESOLVED TYPE FINDER
-
-/// The unresolved type **finder** walks a type searching for
-/// type variables that don't yet have a value. The first unresolved type is stored.
-/// It does not construct the fully resolved type (which might
-/// involve some hashing and so forth).
-pub struct UnresolvedTypeOrConstFinder<'a, 'tcx> {
-    infcx: &'a InferCtxt<'tcx>,
-}
-
-impl<'a, 'tcx> UnresolvedTypeOrConstFinder<'a, 'tcx> {
-    pub fn new(infcx: &'a InferCtxt<'tcx>) -> Self {
-        UnresolvedTypeOrConstFinder { infcx }
-    }
-}
-
-impl<'a, 'tcx> TypeVisitor<TyCtxt<'tcx>> for UnresolvedTypeOrConstFinder<'a, 'tcx> {
-    type BreakTy = (ty::Term<'tcx>, Option<Span>);
-    fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
-        let t = self.infcx.shallow_resolve(t);
-        if let ty::Infer(infer_ty) = *t.kind() {
-            // Since we called `shallow_resolve` above, this must
-            // be an (as yet...) unresolved inference variable.
-            let ty_var_span = if let ty::TyVar(ty_vid) = infer_ty {
-                let mut inner = self.infcx.inner.borrow_mut();
-                let ty_vars = &inner.type_variables();
-                if let TypeVariableOrigin {
-                    kind: TypeVariableOriginKind::TypeParameterDefinition(_, _),
-                    span,
-                } = ty_vars.var_origin(ty_vid)
-                {
-                    Some(span)
-                } else {
-                    None
-                }
-            } else {
-                None
-            };
-            ControlFlow::Break((t.into(), ty_var_span))
-        } else if !t.has_non_region_infer() {
-            // All const/type variables in inference types must already be resolved,
-            // no need to visit the contents.
-            ControlFlow::Continue(())
-        } else {
-            // Otherwise, keep visiting.
-            t.super_visit_with(self)
-        }
-    }
-
-    fn visit_const(&mut self, ct: ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
-        let ct = self.infcx.shallow_resolve(ct);
-        if let ty::ConstKind::Infer(i) = ct.kind() {
-            // Since we called `shallow_resolve` above, this must
-            // be an (as yet...) unresolved inference variable.
-            let ct_var_span = if let ty::InferConst::Var(vid) = i {
-                let mut inner = self.infcx.inner.borrow_mut();
-                let ct_vars = &mut inner.const_unification_table();
-                if let ConstVariableOrigin {
-                    span,
-                    kind: ConstVariableOriginKind::ConstParameterDefinition(_, _),
-                } = ct_vars.probe_value(vid).origin
-                {
-                    Some(span)
-                } else {
-                    None
-                }
-            } else {
-                None
-            };
-            ControlFlow::Break((ct.into(), ct_var_span))
-        } else if !ct.has_non_region_infer() {
-            // All const/type variables in inference types must already be resolved,
-            // no need to visit the contents.
-            ControlFlow::Continue(())
-        } else {
-            // Otherwise, keep visiting.
-            ct.super_visit_with(self)
-        }
-    }
-}
-
 ///////////////////////////////////////////////////////////////////////////
 // FULL TYPE RESOLUTION