Auto merge of rust-lang#110239 - matthiaskrgr:rollup-o90hx4s, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#109959 (Fix transmute intrinsic mir validation ICE)
 - rust-lang#110176 (Renumbering cleanups)
 - rust-lang#110182 (Use `itertools::Either` instead of own impl)
 - rust-lang#110188 (Remove orphaned remove_dir_all implementation from rust-installer)
 - rust-lang#110190 (Custom MIR: Support `BinOp::Offset`)
 - rust-lang#110209 (Add regression test for rust-lang#59003)
 - rust-lang#110210 (`DescriptionCtx` cleanups)
 - rust-lang#110217 (doc: loongarch: Fix typos)

Failed merges:

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

Author: bors

Cargo.lock

@@ -2769,13 +2769,11 @@ dependencies = [
  "anyhow",
  "clap 3.2.20",
  "flate2",
- "lazy_static",
  "num_cpus",
  "rayon",
  "remove_dir_all",
  "tar",
  "walkdir",
- "winapi",
  "xz2",
 ]
 
@@ -4576,6 +4574,7 @@ dependencies = [
  "elsa",
  "ena",
  "indexmap",
+ "itertools",
  "jobserver",
  "libc",
  "measureme",

compiler/rustc_borrowck/src/renumber.rs

@@ -20,31 +20,13 @@ pub fn renumber_mir<'tcx>(
 ) {
     debug!(?body.arg_count);
 
-    let mut visitor = NllVisitor { infcx };
+    let mut renumberer = RegionRenumberer { infcx };
 
     for body in promoted.iter_mut() {
-        visitor.visit_body(body);
+        renumberer.visit_body(body);
     }
 
-    visitor.visit_body(body);
-}
-
-/// Replaces all regions appearing in `value` with fresh inference
-/// variables.
-#[instrument(skip(infcx, get_ctxt_fn), level = "debug")]
-pub(crate) fn renumber_regions<'tcx, T, F>(
-    infcx: &BorrowckInferCtxt<'_, 'tcx>,
-    value: T,
-    get_ctxt_fn: F,
-) -> T
-where
-    T: TypeFoldable<TyCtxt<'tcx>>,
-    F: Fn() -> RegionCtxt,
-{
-    infcx.tcx.fold_regions(value, |_region, _depth| {
-        let origin = NllRegionVariableOrigin::Existential { from_forall: false };
-        infcx.next_nll_region_var(origin, || get_ctxt_fn())
-    })
+    renumberer.visit_body(body);
 }
 
 #[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
@@ -82,21 +64,26 @@ impl RegionCtxt {
     }
 }
 
-struct NllVisitor<'a, 'tcx> {
+struct RegionRenumberer<'a, 'tcx> {
     infcx: &'a BorrowckInferCtxt<'a, 'tcx>,
 }
 
-impl<'a, 'tcx> NllVisitor<'a, 'tcx> {
+impl<'a, 'tcx> RegionRenumberer<'a, 'tcx> {
+    /// Replaces all regions appearing in `value` with fresh inference
+    /// variables.
     fn renumber_regions<T, F>(&mut self, value: T, region_ctxt_fn: F) -> T
     where
         T: TypeFoldable<TyCtxt<'tcx>>,
         F: Fn() -> RegionCtxt,
     {
-        renumber_regions(self.infcx, value, region_ctxt_fn)
+        let origin = NllRegionVariableOrigin::Existential { from_forall: false };
+        self.infcx.tcx.fold_regions(value, |_region, _depth| {
+            self.infcx.next_nll_region_var(origin, || region_ctxt_fn())
+        })
     }
 }
 
-impl<'a, 'tcx> MutVisitor<'tcx> for NllVisitor<'a, 'tcx> {
+impl<'a, 'tcx> MutVisitor<'tcx> for RegionRenumberer<'a, 'tcx> {
     fn tcx(&self) -> TyCtxt<'tcx> {
         self.infcx.tcx
     }
@@ -124,9 +111,9 @@ impl<'a, 'tcx> MutVisitor<'tcx> for NllVisitor<'a, 'tcx> {
     }
 
     #[instrument(skip(self), level = "debug")]
-    fn visit_constant(&mut self, constant: &mut Constant<'tcx>, _location: Location) {
+    fn visit_constant(&mut self, constant: &mut Constant<'tcx>, location: Location) {
         let literal = constant.literal;
-        constant.literal = self.renumber_regions(literal, || RegionCtxt::Location(_location));
+        constant.literal = self.renumber_regions(literal, || RegionCtxt::Location(location));
         debug!("constant: {:#?}", constant);
     }
 }

compiler/rustc_const_eval/src/transform/validate.rs

@@ -679,13 +679,21 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
                             // Unlike `mem::transmute`, a MIR `Transmute` is well-formed
                             // for any two `Sized` types, just potentially UB to run.
 
-                            if !op_ty.is_sized(self.tcx, self.param_env) {
+                            if !self
+                                .tcx
+                                .normalize_erasing_regions(self.param_env, op_ty)
+                                .is_sized(self.tcx, self.param_env)
+                            {
                                 self.fail(
                                     location,
                                     format!("Cannot transmute from non-`Sized` type {op_ty:?}"),
                                 );
                             }
-                            if !target_type.is_sized(self.tcx, self.param_env) {
+                            if !self
+                                .tcx
+                                .normalize_erasing_regions(self.param_env, *target_type)
+                                .is_sized(self.tcx, self.param_env)
+                            {
                                 self.fail(
                                     location,
                                     format!("Cannot transmute to non-`Sized` type {target_type:?}"),

compiler/rustc_data_structures/Cargo.toml

@@ -33,6 +33,7 @@ tempfile = "3.2"
 thin-vec = "0.2.12"
 tracing = "0.1"
 elsa = "=1.7.1"
+itertools = "0.10.1"
 
 [dependencies.parking_lot]
 version = "0.11"

compiler/rustc_data_structures/src/sso/either_iter.rs

@@ -1,24 +1,24 @@
-use super::either_iter::EitherIter;
 use crate::fx::FxHashMap;
 use arrayvec::ArrayVec;
+use itertools::Either;
 use std::fmt;
 use std::hash::Hash;
 use std::ops::Index;
 
-// For pointer-sized arguments arrays
-// are faster than set/map for up to 64
-// arguments.
-//
-// On the other hand such a big array
-// hurts cache performance, makes passing
-// sso structures around very expensive.
-//
-// Biggest performance benefit is gained
-// for reasonably small arrays that stay
-// small in vast majority of cases.
-//
-// '8' is chosen as a sane default, to be
-// reevaluated later.
+/// For pointer-sized arguments arrays
+/// are faster than set/map for up to 64
+/// arguments.
+///
+/// On the other hand such a big array
+/// hurts cache performance, makes passing
+/// sso structures around very expensive.
+///
+/// Biggest performance benefit is gained
+/// for reasonably small arrays that stay
+/// small in vast majority of cases.
+///
+/// '8' is chosen as a sane default, to be
+/// reevaluated later.
 const SSO_ARRAY_SIZE: usize = 8;
 
 /// Small-storage-optimized implementation of a map.
@@ -138,35 +138,35 @@ impl<K, V> SsoHashMap<K, V> {
     /// The iterator element type is `&'a K`.
     pub fn keys(&self) -> impl Iterator<Item = &'_ K> {
         match self {
-            SsoHashMap::Array(array) => EitherIter::Left(array.iter().map(|(k, _v)| k)),
-            SsoHashMap::Map(map) => EitherIter::Right(map.keys()),
+            SsoHashMap::Array(array) => Either::Left(array.iter().map(|(k, _v)| k)),
+            SsoHashMap::Map(map) => Either::Right(map.keys()),
         }
     }
 
     /// An iterator visiting all values in arbitrary order.
     /// The iterator element type is `&'a V`.
     pub fn values(&self) -> impl Iterator<Item = &'_ V> {
         match self {
-            SsoHashMap::Array(array) => EitherIter::Left(array.iter().map(|(_k, v)| v)),
-            SsoHashMap::Map(map) => EitherIter::Right(map.values()),
+            SsoHashMap::Array(array) => Either::Left(array.iter().map(|(_k, v)| v)),
+            SsoHashMap::Map(map) => Either::Right(map.values()),
         }
     }
 
     /// An iterator visiting all values mutably in arbitrary order.
     /// The iterator element type is `&'a mut V`.
     pub fn values_mut(&mut self) -> impl Iterator<Item = &'_ mut V> {
         match self {
-            SsoHashMap::Array(array) => EitherIter::Left(array.iter_mut().map(|(_k, v)| v)),
-            SsoHashMap::Map(map) => EitherIter::Right(map.values_mut()),
+            SsoHashMap::Array(array) => Either::Left(array.iter_mut().map(|(_k, v)| v)),
+            SsoHashMap::Map(map) => Either::Right(map.values_mut()),
         }
     }
 
     /// Clears the map, returning all key-value pairs as an iterator. Keeps the
     /// allocated memory for reuse.
     pub fn drain(&mut self) -> impl Iterator<Item = (K, V)> + '_ {
         match self {
-            SsoHashMap::Array(array) => EitherIter::Left(array.drain(..)),
-            SsoHashMap::Map(map) => EitherIter::Right(map.drain()),
+            SsoHashMap::Array(array) => Either::Left(array.drain(..)),
+            SsoHashMap::Map(map) => Either::Right(map.drain()),
         }
     }
 }
@@ -406,16 +406,16 @@ where
 }
 
 impl<K, V> IntoIterator for SsoHashMap<K, V> {
-    type IntoIter = EitherIter<
-        <ArrayVec<(K, V), 8> as IntoIterator>::IntoIter,
+    type IntoIter = Either<
+        <ArrayVec<(K, V), SSO_ARRAY_SIZE> as IntoIterator>::IntoIter,
         <FxHashMap<K, V> as IntoIterator>::IntoIter,
     >;
     type Item = <Self::IntoIter as Iterator>::Item;
 
     fn into_iter(self) -> Self::IntoIter {
         match self {
-            SsoHashMap::Array(array) => EitherIter::Left(array.into_iter()),
-            SsoHashMap::Map(map) => EitherIter::Right(map.into_iter()),
+            SsoHashMap::Array(array) => Either::Left(array.into_iter()),
+            SsoHashMap::Map(map) => Either::Right(map.into_iter()),
         }
     }
 }
@@ -435,9 +435,9 @@ fn adapt_array_mut_it<K, V>(pair: &mut (K, V)) -> (&K, &mut V) {
 }
 
 impl<'a, K, V> IntoIterator for &'a SsoHashMap<K, V> {
-    type IntoIter = EitherIter<
+    type IntoIter = Either<
         std::iter::Map<
-            <&'a ArrayVec<(K, V), 8> as IntoIterator>::IntoIter,
+            <&'a ArrayVec<(K, V), SSO_ARRAY_SIZE> as IntoIterator>::IntoIter,
             fn(&'a (K, V)) -> (&'a K, &'a V),
         >,
         <&'a FxHashMap<K, V> as IntoIterator>::IntoIter,
@@ -446,16 +446,16 @@ impl<'a, K, V> IntoIterator for &'a SsoHashMap<K, V> {
 
     fn into_iter(self) -> Self::IntoIter {
         match self {
-            SsoHashMap::Array(array) => EitherIter::Left(array.into_iter().map(adapt_array_ref_it)),
-            SsoHashMap::Map(map) => EitherIter::Right(map.iter()),
+            SsoHashMap::Array(array) => Either::Left(array.into_iter().map(adapt_array_ref_it)),
+            SsoHashMap::Map(map) => Either::Right(map.iter()),
         }
     }
 }
 
 impl<'a, K, V> IntoIterator for &'a mut SsoHashMap<K, V> {
-    type IntoIter = EitherIter<
+    type IntoIter = Either<
         std::iter::Map<
-            <&'a mut ArrayVec<(K, V), 8> as IntoIterator>::IntoIter,
+            <&'a mut ArrayVec<(K, V), SSO_ARRAY_SIZE> as IntoIterator>::IntoIter,
             fn(&'a mut (K, V)) -> (&'a K, &'a mut V),
         >,
         <&'a mut FxHashMap<K, V> as IntoIterator>::IntoIter,
@@ -464,8 +464,8 @@ impl<'a, K, V> IntoIterator for &'a mut SsoHashMap<K, V> {
 
     fn into_iter(self) -> Self::IntoIter {
         match self {
-            SsoHashMap::Array(array) => EitherIter::Left(array.into_iter().map(adapt_array_mut_it)),
-            SsoHashMap::Map(map) => EitherIter::Right(map.iter_mut()),
+            SsoHashMap::Array(array) => Either::Left(array.into_iter().map(adapt_array_mut_it)),
+            SsoHashMap::Map(map) => Either::Right(map.iter_mut()),
         }
     }
 }

compiler/rustc_data_structures/src/sso/map.rs

@@ -1,4 +1,3 @@
-mod either_iter;
 mod map;
 mod set;
 

compiler/rustc_data_structures/src/sso/mod.rs

@@ -163,7 +163,6 @@ infer_region_explanation = {$pref_kind ->
     [as_defined] the lifetime `{$desc_arg}` as defined here
     [as_defined_anon] the anonymous lifetime as defined here
     [defined_here] the anonymous lifetime defined here
-    [anon_num_here] the anonymous lifetime #{$desc_num_arg} defined here
     [defined_here_reg] the lifetime `{$desc_arg}` as defined here
 }{$suff_kind ->
     *[should_not_happen] [{$suff_kind}]