Auto merge of #97989 - Dylan-DPC:rollup-wol1a1y, r=Dylan-DPC

Rollup of 5 pull requests

Successful merges:

 - #97761 (validating the vtable can lead to Stacked Borrows errors)
 - #97789 (Fix #71363's test by adding `-Z translate-remapped-path-to-local-path=no`)
 - #97913 (Wrap `HirId`s of locals into `LocalVarId`s for THIR nodes)
 - #97979 (Fix typos in Provider API docs)
 - #97987 (remove an unnecessary `String`)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

compiler/rustc_const_eval/src/interpret/validity.rs

@@ -338,6 +338,10 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, '
                         { "invalid drop function pointer in vtable (not pointing to a function)" },
                     err_ub!(InvalidVtableDropFn(..)) =>
                         { "invalid drop function pointer in vtable (function has incompatible signature)" },
+                    // Stacked Borrows errors can happen here, see https://github.com/rust-lang/miri/issues/2123.
+                    // (We assume there are no other MachineStop errors possible here.)
+                    InterpError::MachineStop(_) =>
+                        { "vtable pointer does not have permission to read drop function pointer" },
                 );
                 try_validation!(
                     self.ecx.read_size_and_align_from_vtable(vtable),
@@ -347,6 +351,10 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, '
                     err_ub!(InvalidVtableAlignment(msg)) =>
                         { "invalid vtable: alignment {}", msg },
                     err_unsup!(ReadPointerAsBytes) => { "invalid size or align in vtable" },
+                    // Stacked Borrows errors can happen here, see https://github.com/rust-lang/miri/issues/2123.
+                    // (We assume there are no other MachineStop errors possible here.)
+                    InterpError::MachineStop(_) =>
+                        { "vtable pointer does not have permission to read size and alignment" },
                 );
                 // FIXME: More checks for the vtable.
             }

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

@@ -304,11 +304,8 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
         error_code: TypeAnnotationNeeded,
     ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
         let error_code = error_code.into();
-        let mut err = self.tcx.sess.struct_span_err_with_code(
-            span,
-            &format!("type annotations needed"),
-            error_code,
-        );
+        let mut err =
+            self.tcx.sess.struct_span_err_with_code(span, "type annotations needed", error_code);
         err.span_label(span, arg_data.cannot_infer_msg());
         err
     }

compiler/rustc_interface/src/tests.rs

@@ -789,6 +789,7 @@ fn test_debugging_options_tracking_hash() {
     tracked!(thinlto, Some(true));
     tracked!(thir_unsafeck, true);
     tracked!(tls_model, Some(TlsModel::GeneralDynamic));
+    tracked!(translate_remapped_path_to_local_path, false);
     tracked!(trap_unreachable, Some(false));
     tracked!(treat_err_as_bug, NonZeroUsize::new(1));
     tracked!(tune_cpu, Some(String::from("abc")));

compiler/rustc_metadata/src/rmeta/decoder.rs

@@ -1486,6 +1486,8 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
             .filter(|_| {
                 // Only spend time on further checks if we have what to translate *to*.
                 sess.opts.real_rust_source_base_dir.is_some()
+                    // Some tests need the translation to be always skipped.
+                    && sess.opts.debugging_opts.translate_remapped_path_to_local_path
             })
             .filter(|virtual_dir| {
                 // Don't translate away `/rustc/$hash` if we're still remapping to it,

compiler/rustc_middle/src/thir.rs

@@ -191,6 +191,20 @@ pub enum StmtKind<'tcx> {
 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 rustc_data_structures::static_assert_size!(Expr<'_>, 104);
 
+#[derive(
+    Clone,
+    Debug,
+    Copy,
+    PartialEq,
+    Eq,
+    Hash,
+    HashStable,
+    TyEncodable,
+    TyDecodable,
+    TypeFoldable
+)]
+pub struct LocalVarId(pub hir::HirId);
+
 /// A THIR expression.
 #[derive(Clone, Debug, HashStable)]
 pub struct Expr<'tcx> {
@@ -332,15 +346,15 @@ pub enum ExprKind<'tcx> {
     },
     /// A local variable.
     VarRef {
-        id: hir::HirId,
+        id: LocalVarId,
     },
     /// Used to represent upvars mentioned in a closure/generator
     UpvarRef {
         /// DefId of the closure/generator
         closure_def_id: DefId,
 
         /// HirId of the root variable
-        var_hir_id: hir::HirId,
+        var_hir_id: LocalVarId,
     },
     /// A borrow, e.g. `&arg`.
     Borrow {
@@ -596,7 +610,7 @@ pub enum PatKind<'tcx> {
         mutability: Mutability,
         name: Symbol,
         mode: BindingMode,
-        var: hir::HirId,
+        var: LocalVarId,
         ty: Ty<'tcx>,
         subpattern: Option<Pat<'tcx>>,
         /// Is this the leftmost occurrence of the binding, i.e., is `var` the

compiler/rustc_mir_build/src/build/expr/as_place.rs

@@ -3,8 +3,7 @@
 use crate::build::expr::category::Category;
 use crate::build::ForGuard::{OutsideGuard, RefWithinGuard};
 use crate::build::{BlockAnd, BlockAndExtension, Builder};
-use rustc_hir::def_id::DefId;
-use rustc_hir::HirId;
+use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_middle::hir::place::Projection as HirProjection;
 use rustc_middle::hir::place::ProjectionKind as HirProjectionKind;
 use rustc_middle::middle::region;
@@ -57,7 +56,7 @@ pub(crate) enum PlaceBase {
     /// figure out that it is captured until all the `Field` projections are applied.
     Upvar {
         /// HirId of the upvar
-        var_hir_id: HirId,
+        var_hir_id: LocalVarId,
         /// DefId of the closure
         closure_def_id: DefId,
         /// The trait closure implements, `Fn`, `FnMut`, `FnOnce`
@@ -151,12 +150,12 @@ fn is_ancestor_or_same_capture(
 /// `ty::MinCaptureList` of the root variable `var_hir_id`.
 fn compute_capture_idx<'tcx>(
     closure_min_captures: &ty::RootVariableMinCaptureList<'tcx>,
-    var_hir_id: HirId,
+    var_hir_id: LocalVarId,
     root_var_idx: usize,
 ) -> usize {
     let mut res = 0;
     for (var_id, capture_list) in closure_min_captures {
-        if *var_id == var_hir_id {
+        if *var_id == var_hir_id.0 {
             res += root_var_idx;
             break;
         } else {
@@ -176,12 +175,12 @@ fn compute_capture_idx<'tcx>(
 /// Returns None, when the ancestor is not found.
 fn find_capture_matching_projections<'a, 'tcx>(
     typeck_results: &'a ty::TypeckResults<'tcx>,
-    var_hir_id: HirId,
+    var_hir_id: LocalVarId,
     closure_def_id: DefId,
     projections: &[PlaceElem<'tcx>],
 ) -> Option<(usize, &'a ty::CapturedPlace<'tcx>)> {
     let closure_min_captures = typeck_results.closure_min_captures.get(&closure_def_id)?;
-    let root_variable_min_captures = closure_min_captures.get(&var_hir_id)?;
+    let root_variable_min_captures = closure_min_captures.get(&var_hir_id.0)?;
 
     let hir_projections = convert_to_hir_projections_and_truncate_for_capture(projections);
 
@@ -500,8 +499,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                 source_info,
             ),
             ExprKind::UpvarRef { closure_def_id, var_hir_id } => {
-                let upvar_id = ty::UpvarId::new(var_hir_id, closure_def_id.expect_local());
-                this.lower_captured_upvar(block, upvar_id)
+                this.lower_captured_upvar(block, closure_def_id.expect_local(), var_hir_id)
             }
 
             ExprKind::VarRef { id } => {
@@ -627,11 +625,11 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
     fn lower_captured_upvar(
         &mut self,
         block: BasicBlock,
-        upvar_id: ty::UpvarId,
+        closure_expr_id: LocalDefId,
+        var_hir_id: LocalVarId,
     ) -> BlockAnd<PlaceBuilder<'tcx>> {
-        let closure_ty = self
-            .typeck_results
-            .node_type(self.tcx.hir().local_def_id_to_hir_id(upvar_id.closure_expr_id));
+        let closure_ty =
+            self.typeck_results.node_type(self.tcx.hir().local_def_id_to_hir_id(closure_expr_id));
 
         let closure_kind = if let ty::Closure(_, closure_substs) = closure_ty.kind() {
             self.infcx.closure_kind(closure_substs).unwrap()
@@ -641,8 +639,8 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
         };
 
         block.and(PlaceBuilder::from(PlaceBase::Upvar {
-            var_hir_id: upvar_id.var_path.hir_id,
-            closure_def_id: upvar_id.closure_expr_id.to_def_id(),
+            var_hir_id,
+            closure_def_id: closure_expr_id.to_def_id(),
             closure_kind,
         }))
     }

compiler/rustc_mir_build/src/build/matches/mod.rs

@@ -14,7 +14,6 @@ use rustc_data_structures::{
     fx::{FxHashSet, FxIndexMap, FxIndexSet},
     stack::ensure_sufficient_stack,
 };
-use rustc_hir::HirId;
 use rustc_index::bit_set::BitSet;
 use rustc_middle::middle::region;
 use rustc_middle::mir::*;
@@ -690,7 +689,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
     pub(crate) fn storage_live_binding(
         &mut self,
         block: BasicBlock,
-        var: HirId,
+        var: LocalVarId,
         span: Span,
         for_guard: ForGuard,
         schedule_drop: bool,
@@ -700,20 +699,20 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
         self.cfg.push(block, Statement { source_info, kind: StatementKind::StorageLive(local_id) });
         // Altough there is almost always scope for given variable in corner cases
         // like #92893 we might get variable with no scope.
-        if let Some(region_scope) = self.region_scope_tree.var_scope(var.local_id) && schedule_drop{
+        if let Some(region_scope) = self.region_scope_tree.var_scope(var.0.local_id) && schedule_drop{
             self.schedule_drop(span, region_scope, local_id, DropKind::Storage);
         }
         Place::from(local_id)
     }
 
     pub(crate) fn schedule_drop_for_binding(
         &mut self,
-        var: HirId,
+        var: LocalVarId,
         span: Span,
         for_guard: ForGuard,
     ) {
         let local_id = self.var_local_id(var, for_guard);
-        if let Some(region_scope) = self.region_scope_tree.var_scope(var.local_id) {
+        if let Some(region_scope) = self.region_scope_tree.var_scope(var.0.local_id) {
             self.schedule_drop(span, region_scope, local_id, DropKind::Value);
         }
     }
@@ -730,7 +729,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             Mutability,
             Symbol,
             BindingMode,
-            HirId,
+            LocalVarId,
             Span,
             Ty<'tcx>,
             UserTypeProjections,
@@ -917,7 +916,7 @@ fn traverse_candidate<'pat, 'tcx: 'pat, C, T, I>(
 struct Binding<'tcx> {
     span: Span,
     source: Place<'tcx>,
-    var_id: HirId,
+    var_id: LocalVarId,
     binding_mode: BindingMode,
 }
 
@@ -2184,7 +2183,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
         mutability: Mutability,
         name: Symbol,
         mode: BindingMode,
-        var_id: HirId,
+        var_id: LocalVarId,
         var_ty: Ty<'tcx>,
         user_ty: UserTypeProjections,
         has_guard: ArmHasGuard,

compiler/rustc_mir_build/src/build/mod.rs

@@ -4,19 +4,20 @@ use crate::build::scope::DropKind;
 use crate::thir::constant::parse_float;
 use crate::thir::pattern::pat_from_hir;
 use rustc_ast as ast;
+use rustc_data_structures::fx::FxHashMap;
 use rustc_errors::ErrorGuaranteed;
 use rustc_hir as hir;
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::lang_items::LangItem;
-use rustc_hir::{GeneratorKind, HirIdMap, Node};
+use rustc_hir::{GeneratorKind, Node};
 use rustc_index::vec::{Idx, IndexVec};
 use rustc_infer::infer::{InferCtxt, TyCtxtInferExt};
 use rustc_middle::hir::place::PlaceBase as HirPlaceBase;
 use rustc_middle::middle::region;
 use rustc_middle::mir::interpret::Allocation;
 use rustc_middle::mir::interpret::{ConstValue, LitToConstError, LitToConstInput, Scalar};
 use rustc_middle::mir::*;
-use rustc_middle::thir::{BindingMode, Expr, ExprId, LintLevel, PatKind, Thir};
+use rustc_middle::thir::{BindingMode, Expr, ExprId, LintLevel, LocalVarId, PatKind, Thir};
 use rustc_middle::ty::subst::Subst;
 use rustc_middle::ty::{self, Ty, TyCtxt, TypeFoldable, TypeckResults};
 use rustc_span::symbol::sym;
@@ -445,7 +446,7 @@ struct Builder<'a, 'tcx> {
 
     /// Maps `HirId`s of variable bindings to the `Local`s created for them.
     /// (A match binding can have two locals; the 2nd is for the arm's guard.)
-    var_indices: HirIdMap<LocalsForNode>,
+    var_indices: FxHashMap<LocalVarId, LocalsForNode>,
     local_decls: IndexVec<Local, LocalDecl<'tcx>>,
     canonical_user_type_annotations: ty::CanonicalUserTypeAnnotations<'tcx>,
     upvar_mutbls: Vec<Mutability>,
@@ -455,11 +456,11 @@ struct Builder<'a, 'tcx> {
 }
 
 impl<'a, 'tcx> Builder<'a, 'tcx> {
-    fn is_bound_var_in_guard(&self, id: hir::HirId) -> bool {
+    fn is_bound_var_in_guard(&self, id: LocalVarId) -> bool {
         self.guard_context.iter().any(|frame| frame.locals.iter().any(|local| local.id == id))
     }
 
-    fn var_local_id(&self, id: hir::HirId, for_guard: ForGuard) -> Local {
+    fn var_local_id(&self, id: LocalVarId, for_guard: ForGuard) -> Local {
         self.var_indices[&id].local_id(for_guard)
     }
 }
@@ -543,11 +544,11 @@ enum LocalsForNode {
 
 #[derive(Debug)]
 struct GuardFrameLocal {
-    id: hir::HirId,
+    id: LocalVarId,
 }
 
 impl GuardFrameLocal {
-    fn new(id: hir::HirId, _binding_mode: BindingMode) -> Self {
+    fn new(id: LocalVarId, _binding_mode: BindingMode) -> Self {
         GuardFrameLocal { id }
     }
 }

compiler/rustc_mir_build/src/thir/cx/expr.rs

@@ -903,9 +903,12 @@ impl<'tcx> Cx<'tcx> {
         );
 
         if is_upvar {
-            ExprKind::UpvarRef { closure_def_id: self.body_owner, var_hir_id }
+            ExprKind::UpvarRef {
+                closure_def_id: self.body_owner,
+                var_hir_id: LocalVarId(var_hir_id),
+            }
         } else {
-            ExprKind::VarRef { id: var_hir_id }
+            ExprKind::VarRef { id: LocalVarId(var_hir_id) }
         }
     }
 

compiler/rustc_mir_build/src/thir/pattern/mod.rs

@@ -19,7 +19,7 @@ use rustc_middle::mir::interpret::{get_slice_bytes, ConstValue};
 use rustc_middle::mir::interpret::{ErrorHandled, LitToConstError, LitToConstInput};
 use rustc_middle::mir::{self, UserTypeProjection};
 use rustc_middle::mir::{BorrowKind, Field, Mutability};
-use rustc_middle::thir::{Ascription, BindingMode, FieldPat, Pat, PatKind, PatRange};
+use rustc_middle::thir::{Ascription, BindingMode, FieldPat, LocalVarId, Pat, PatKind, PatRange};
 use rustc_middle::ty::subst::{GenericArg, SubstsRef};
 use rustc_middle::ty::CanonicalUserTypeAnnotation;
 use rustc_middle::ty::{self, AdtDef, ConstKind, DefIdTree, Region, Ty, TyCtxt, UserType};
@@ -288,7 +288,7 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
                     mutability,
                     mode,
                     name: ident.name,
-                    var: id,
+                    var: LocalVarId(id),
                     ty: var_ty,
                     subpattern: self.lower_opt_pattern(sub),
                     is_primary: id == pat.hir_id,
@@ -664,7 +664,7 @@ macro_rules! ClonePatternFoldableImpls {
 }
 
 ClonePatternFoldableImpls! { <'tcx>
-    Span, Field, Mutability, Symbol, hir::HirId, usize, ty::Const<'tcx>,
+    Span, Field, Mutability, Symbol, LocalVarId, usize, ty::Const<'tcx>,
     Region<'tcx>, Ty<'tcx>, BindingMode, AdtDef<'tcx>,
     SubstsRef<'tcx>, &'tcx GenericArg<'tcx>, UserType<'tcx>,
     UserTypeProjection, CanonicalUserTypeAnnotation<'tcx>

compiler/rustc_session/src/options.rs

@@ -1541,6 +1541,8 @@ options! {
         "choose the TLS model to use (`rustc --print tls-models` for details)"),
     trace_macros: bool = (false, parse_bool, [UNTRACKED],
         "for every macro invocation, print its name and arguments (default: no)"),
+    translate_remapped_path_to_local_path: bool = (true, parse_bool, [TRACKED],
+        "translate remapped paths into local paths when possible (default: yes)"),
     trap_unreachable: Option<bool> = (None, parse_opt_bool, [TRACKED],
         "generate trap instructions for unreachable intrinsics (default: use target setting, usually yes)"),
     treat_err_as_bug: Option<NonZeroUsize> = (None, parse_treat_err_as_bug, [TRACKED],

library/core/src/any.rs

@@ -94,7 +94,7 @@
 //! functions for requesting data from an object which implements `Provider`. Generally, end users
 //! should not call `request_*` directly, they are helper functions for intermediate implementers
 //! to use to implement a user-facing interface. This is purely for the sake of ergonomics, there is
-//! safety concern here; intermediate implementers can typically support methods rather than
+//! no safety concern here; intermediate implementers can typically support methods rather than
 //! free functions and use more specific names.
 //!
 //! Typically, a data provider is a trait object of a trait which extends `Provider`. A user will
@@ -1007,7 +1007,7 @@ mod tags {
         type Reified = T;
     }
 
-    /// Type-based tag similar to [`Value`] but which may be unsized (i.e., has a `'Sized` bound).
+    /// Type-based tag similar to [`Value`] but which may be unsized (i.e., has a `?Sized` bound).
     #[derive(Debug)]
     pub struct MaybeSizedValue<T: ?Sized + 'static>(PhantomData<T>);