Rollup of 5 pull requests

compiler/rustc_ast/src/util/comments.rs

@@ -169,7 +169,7 @@ pub fn gather_comments(sm: &SourceMap, path: FileName, src: String) -> Vec<Comme
                 if let Some(mut idx) = token_text.find('\n') {
                     code_to_the_left = false;
                     while let Some(next_newline) = &token_text[idx + 1..].find('\n') {
-                        idx = idx + 1 + next_newline;
+                        idx += 1 + next_newline;
                         comments.push(Comment {
                             style: CommentStyle::BlankLine,
                             lines: vec![],

compiler/rustc_codegen_llvm/src/intrinsic.rs

@@ -19,7 +19,7 @@ use rustc_middle::ty::layout::{FnAbiOf, HasTyCtxt, LayoutOf};
 use rustc_middle::ty::{self, Ty};
 use rustc_middle::{bug, span_bug};
 use rustc_span::{sym, symbol::kw, Span, Symbol};
-use rustc_target::abi::{self, HasDataLayout, Primitive};
+use rustc_target::abi::{self, Align, HasDataLayout, Primitive};
 use rustc_target::spec::{HasTargetSpec, PanicStrategy};
 
 use std::cmp::Ordering;
@@ -857,28 +857,39 @@ fn generic_simd_intrinsic(
     let arg_tys = sig.inputs();
 
     if name == sym::simd_select_bitmask {
-        let in_ty = arg_tys[0];
-        let m_len = match in_ty.kind() {
-            // Note that this `.unwrap()` crashes for isize/usize, that's sort
-            // of intentional as there's not currently a use case for that.
-            ty::Int(i) => i.bit_width().unwrap(),
-            ty::Uint(i) => i.bit_width().unwrap(),
-            _ => return_error!("`{}` is not an integral type", in_ty),
-        };
         require_simd!(arg_tys[1], "argument");
-        let (v_len, _) = arg_tys[1].simd_size_and_type(bx.tcx());
-        require!(
-            // Allow masks for vectors with fewer than 8 elements to be
-            // represented with a u8 or i8.
-            m_len == v_len || (m_len == 8 && v_len < 8),
-            "mismatched lengths: mask length `{}` != other vector length `{}`",
-            m_len,
-            v_len
-        );
+        let (len, _) = arg_tys[1].simd_size_and_type(bx.tcx());
+
+        let expected_int_bits = (len.max(8) - 1).next_power_of_two();
+        let expected_bytes = len / 8 + ((len % 8 > 0) as u64);
+
+        let mask_ty = arg_tys[0];
+        let mask = match mask_ty.kind() {
+            ty::Int(i) if i.bit_width() == Some(expected_int_bits) => args[0].immediate(),
+            ty::Uint(i) if i.bit_width() == Some(expected_int_bits) => args[0].immediate(),
+            ty::Array(elem, len)
+                if matches!(elem.kind(), ty::Uint(ty::UintTy::U8))
+                    && len.try_eval_usize(bx.tcx, ty::ParamEnv::reveal_all())
+                        == Some(expected_bytes) =>
+            {
+                let place = PlaceRef::alloca(bx, args[0].layout);
+                args[0].val.store(bx, place);
+                let int_ty = bx.type_ix(expected_bytes * 8);
+                let ptr = bx.pointercast(place.llval, bx.cx.type_ptr_to(int_ty));
+                bx.load(int_ty, ptr, Align::ONE)
+            }
+            _ => return_error!(
+                "invalid bitmask `{}`, expected `u{}` or `[u8; {}]`",
+                mask_ty,
+                expected_int_bits,
+                expected_bytes
+            ),
+        };
+
         let i1 = bx.type_i1();
-        let im = bx.type_ix(v_len);
-        let i1xn = bx.type_vector(i1, v_len);
-        let m_im = bx.trunc(args[0].immediate(), im);
+        let im = bx.type_ix(len);
+        let i1xn = bx.type_vector(i1, len);
+        let m_im = bx.trunc(mask, im);
         let m_i1s = bx.bitcast(m_im, i1xn);
         return Ok(bx.select(m_i1s, args[1].immediate(), args[2].immediate()));
     }
@@ -1056,16 +1067,16 @@ fn generic_simd_intrinsic(
 
     if name == sym::simd_bitmask {
         // The `fn simd_bitmask(vector) -> unsigned integer` intrinsic takes a
-        // vector mask and returns an unsigned integer containing the most
-        // significant bit (MSB) of each lane.
-
-        // If the vector has less than 8 lanes, a u8 is returned with zeroed
-        // trailing bits.
+        // vector mask and returns the most significant bit (MSB) of each lane in the form
+        // of either:
+        // * an unsigned integer
+        // * an array of `u8`
+        // If the vector has less than 8 lanes, a u8 is returned with zeroed trailing bits.
+        //
+        // The bit order of the result depends on the byte endianness, LSB-first for little
+        // endian and MSB-first for big endian.
         let expected_int_bits = in_len.max(8);
-        match ret_ty.kind() {
-            ty::Uint(i) if i.bit_width() == Some(expected_int_bits) => (),
-            _ => return_error!("bitmask `{}`, expected `u{}`", ret_ty, expected_int_bits),
-        }
+        let expected_bytes = expected_int_bits / 8 + ((expected_int_bits % 8 > 0) as u64);
 
         // Integer vector <i{in_bitwidth} x in_len>:
         let (i_xn, in_elem_bitwidth) = match in_elem.kind() {
@@ -1095,8 +1106,34 @@ fn generic_simd_intrinsic(
         let i1xn = bx.trunc(i_xn_msb, bx.type_vector(bx.type_i1(), in_len));
         // Bitcast <i1 x N> to iN:
         let i_ = bx.bitcast(i1xn, bx.type_ix(in_len));
-        // Zero-extend iN to the bitmask type:
-        return Ok(bx.zext(i_, bx.type_ix(expected_int_bits)));
+
+        match ret_ty.kind() {
+            ty::Uint(i) if i.bit_width() == Some(expected_int_bits) => {
+                // Zero-extend iN to the bitmask type:
+                return Ok(bx.zext(i_, bx.type_ix(expected_int_bits)));
+            }
+            ty::Array(elem, len)
+                if matches!(elem.kind(), ty::Uint(ty::UintTy::U8))
+                    && len.try_eval_usize(bx.tcx, ty::ParamEnv::reveal_all())
+                        == Some(expected_bytes) =>
+            {
+                // Zero-extend iN to the array lengh:
+                let ze = bx.zext(i_, bx.type_ix(expected_bytes * 8));
+
+                // Convert the integer to a byte array
+                let ptr = bx.alloca(bx.type_ix(expected_bytes * 8), Align::ONE);
+                bx.store(ze, ptr, Align::ONE);
+                let array_ty = bx.type_array(bx.type_i8(), expected_bytes);
+                let ptr = bx.pointercast(ptr, bx.cx.type_ptr_to(array_ty));
+                return Ok(bx.load(array_ty, ptr, Align::ONE));
+            }
+            _ => return_error!(
+                "cannot return `{}`, expected `u{}` or `[u8; {}]`",
+                ret_ty,
+                expected_int_bits,
+                expected_bytes
+            ),
+        }
     }
 
     fn simd_simple_float_intrinsic(

compiler/rustc_metadata/src/rmeta/decoder.rs

@@ -1179,7 +1179,7 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
                             let ctor_res =
                                 Res::Def(DefKind::Ctor(CtorOf::Variant, ctor_kind), ctor_def_id);
                             let mut vis = self.get_visibility(ctor_def_id.index);
-                            if ctor_def_id == def_id && vis == ty::Visibility::Public {
+                            if ctor_def_id == def_id && vis.is_public() {
                                 // For non-exhaustive variants lower the constructor visibility to
                                 // within the crate. We only need this for fictive constructors,
                                 // for other constructors correct visibilities

compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs

@@ -318,7 +318,7 @@ pub fn provide(providers: &mut Providers) {
             }
 
             let mut add_child = |bfs_queue: &mut VecDeque<_>, child: &Export, parent: DefId| {
-                if child.vis != ty::Visibility::Public {
+                if !child.vis.is_public() {
                     return;
                 }
 

compiler/rustc_middle/src/ty/mod.rs

@@ -333,6 +333,10 @@ impl Visibility {
             Visibility::Invisible => false,
         }
     }
+
+    pub fn is_public(self) -> bool {
+        matches!(self, Visibility::Public)
+    }
 }
 
 /// The crate variances map is computed during typeck and contains the

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -2404,7 +2404,7 @@ fn for_each_def(tcx: TyCtxt<'_>, mut collect_fn: impl for<'b> FnMut(&'b Ident, N
     // Iterate external crate defs but be mindful about visibility
     while let Some(def) = queue.pop() {
         for child in tcx.item_children(def).iter() {
-            if child.vis != ty::Visibility::Public {
+            if !child.vis.is_public() {
                 continue;
             }
 

compiler/rustc_middle/src/util/common.rs

@@ -34,7 +34,7 @@ where
     let rv = f();
     let duration = start.elapsed();
     let mut accu = accu.lock();
-    *accu = *accu + duration;
+    *accu += duration;
     rv
 }
 

compiler/rustc_privacy/src/lib.rs

@@ -543,7 +543,7 @@ impl EmbargoVisitor<'tcx> {
         module: LocalDefId,
     ) {
         let level = Some(AccessLevel::Reachable);
-        if let ty::Visibility::Public = vis {
+        if vis.is_public() {
             self.update(def_id, level);
         }
         match def_kind {
@@ -580,7 +580,7 @@ impl EmbargoVisitor<'tcx> {
 
             DefKind::Struct | DefKind::Union => {
                 // While structs and unions have type privacy, their fields do not.
-                if let ty::Visibility::Public = vis {
+                if vis.is_public() {
                     let item =
                         self.tcx.hir().expect_item(self.tcx.hir().local_def_id_to_hir_id(def_id));
                     if let hir::ItemKind::Struct(ref struct_def, _)
@@ -933,7 +933,7 @@ impl Visitor<'tcx> for EmbargoVisitor<'tcx> {
             let def_id = self.tcx.hir().local_def_id(id);
             if let Some(exports) = self.tcx.module_exports(def_id) {
                 for export in exports.iter() {
-                    if export.vis == ty::Visibility::Public {
+                    if export.vis.is_public() {
                         if let Some(def_id) = export.res.opt_def_id() {
                             if let Some(def_id) = def_id.as_local() {
                                 self.update(def_id, Some(AccessLevel::Exported));
@@ -1918,8 +1918,7 @@ impl SearchInterfaceForPrivateItemsVisitor<'tcx> {
     /// 1. It's contained within a public type
     /// 2. It comes from a private crate
     fn leaks_private_dep(&self, item_id: DefId) -> bool {
-        let ret = self.required_visibility == ty::Visibility::Public
-            && self.tcx.is_private_dep(item_id.krate);
+        let ret = self.required_visibility.is_public() && self.tcx.is_private_dep(item_id.krate);
 
         tracing::debug!("leaks_private_dep(item_id={:?})={}", item_id, ret);
         ret

compiler/rustc_resolve/src/check_unused.rs

@@ -32,7 +32,6 @@ use rustc_ast::visit::{self, Visitor};
 use rustc_ast_lowering::ResolverAstLowering;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::pluralize;
-use rustc_middle::ty;
 use rustc_session::lint::builtin::{MACRO_USE_EXTERN_CRATE, UNUSED_IMPORTS};
 use rustc_session::lint::BuiltinLintDiagnostics;
 use rustc_span::{MultiSpan, Span, DUMMY_SP};
@@ -228,7 +227,7 @@ impl Resolver<'_> {
         for import in self.potentially_unused_imports.iter() {
             match import.kind {
                 _ if import.used.get()
-                    || import.vis.get() == ty::Visibility::Public
+                    || import.vis.get().is_public()
                     || import.span.is_dummy() =>
                 {
                     if let ImportKind::MacroUse = import.kind {

compiler/rustc_resolve/src/diagnostics.rs

@@ -11,7 +11,7 @@ use rustc_hir::def::{self, CtorKind, CtorOf, DefKind, NonMacroAttrKind};
 use rustc_hir::def_id::{DefId, CRATE_DEF_INDEX, LOCAL_CRATE};
 use rustc_hir::PrimTy;
 use rustc_middle::bug;
-use rustc_middle::ty::{self, DefIdTree};
+use rustc_middle::ty::DefIdTree;
 use rustc_session::Session;
 use rustc_span::hygiene::MacroKind;
 use rustc_span::lev_distance::find_best_match_for_name;
@@ -1308,7 +1308,7 @@ impl<'a> Resolver<'a> {
             );
             let def_span = self.session.source_map().guess_head_span(binding.span);
             let mut note_span = MultiSpan::from_span(def_span);
-            if !first && binding.vis == ty::Visibility::Public {
+            if !first && binding.vis.is_public() {
                 note_span.push_span_label(def_span, "consider importing it directly".into());
             }
             err.span_note(note_span, &msg);

compiler/rustc_resolve/src/imports.rs

@@ -164,7 +164,7 @@ fn pub_use_of_private_extern_crate_hack(import: &Import<'_>, binding: &NameBindi
                 import: Import { kind: ImportKind::ExternCrate { .. }, .. },
                 ..
             },
-        ) => import.vis.get() == ty::Visibility::Public,
+        ) => import.vis.get().is_public(),
         _ => false,
     }
 }

compiler/rustc_typeck/src/check/expr.rs

@@ -35,14 +35,11 @@ use rustc_hir::{ExprKind, QPath};
 use rustc_infer::infer;
 use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
 use rustc_infer::infer::InferOk;
-use rustc_middle::ty;
 use rustc_middle::ty::adjustment::{Adjust, Adjustment, AllowTwoPhase};
 use rustc_middle::ty::error::TypeError::{FieldMisMatch, Sorts};
 use rustc_middle::ty::relate::expected_found_bool;
 use rustc_middle::ty::subst::SubstsRef;
-use rustc_middle::ty::Ty;
-use rustc_middle::ty::TypeFoldable;
-use rustc_middle::ty::{AdtKind, Visibility};
+use rustc_middle::ty::{self, AdtKind, Ty, TypeFoldable};
 use rustc_session::parse::feature_err;
 use rustc_span::edition::LATEST_STABLE_EDITION;
 use rustc_span::hygiene::DesugaringKind;
@@ -1732,7 +1729,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             .filter_map(|field| {
                 // ignore already set fields and private fields from non-local crates
                 if skip.iter().any(|&x| x == field.ident.name)
-                    || (!variant.def_id.is_local() && field.vis != Visibility::Public)
+                    || (!variant.def_id.is_local() && !field.vis.is_public())
                 {
                     None
                 } else {

compiler/rustc_typeck/src/check/method/suggest.rs

@@ -1410,7 +1410,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                                 }
                             }
                             // We only want to suggest public or local traits (#45781).
-                            item.vis == ty::Visibility::Public || info.def_id.is_local()
+                            item.vis.is_public() || info.def_id.is_local()
                         })
                         .is_some()
             })

library/std/src/collections/mod.rs

@@ -268,7 +268,7 @@
 //! not. Normally, this would require a `find` followed by an `insert`,
 //! effectively duplicating the search effort on each insertion.
 //!
-//! When a user calls `map.entry(&key)`, the map will search for the key and
+//! When a user calls `map.entry(key)`, the map will search for the key and
 //! then yield a variant of the `Entry` enum.
 //!
 //! If a `Vacant(entry)` is yielded, then the key *was not* found. In this case

src/librustdoc/clean/inline.rs

@@ -435,7 +435,7 @@ crate fn build_impl(
             tcx.associated_items(did)
                 .in_definition_order()
                 .filter_map(|item| {
-                    if associated_trait.is_some() || item.vis == ty::Visibility::Public {
+                    if associated_trait.is_some() || item.vis.is_public() {
                         Some(item.clean(cx))
                     } else {
                         None
@@ -515,7 +515,7 @@ fn build_module(
     // two namespaces, so the target may be listed twice. Make sure we only
     // visit each node at most once.
     for &item in cx.tcx.item_children(did).iter() {
-        if item.vis == ty::Visibility::Public {
+        if item.vis.is_public() {
             let res = item.res.expect_non_local();
             if let Some(def_id) = res.mod_def_id() {
                 if did == def_id || !visited.insert(def_id) {

src/librustdoc/clean/mod.rs

@@ -1881,7 +1881,7 @@ fn clean_extern_crate(
     // this is the ID of the crate itself
     let crate_def_id = DefId { krate: cnum, index: CRATE_DEF_INDEX };
     let attrs = cx.tcx.hir().attrs(krate.hir_id());
-    let please_inline = krate.vis.node.is_pub()
+    let please_inline = cx.tcx.visibility(krate.def_id).is_public()
         && attrs.iter().any(|a| {
             a.has_name(sym::doc)
                 && match a.meta_item_list() {
@@ -1933,9 +1933,12 @@ fn clean_use_statement(
         return Vec::new();
     }
 
+    let visibility = cx.tcx.visibility(import.def_id);
     let attrs = cx.tcx.hir().attrs(import.hir_id());
     let inline_attr = attrs.lists(sym::doc).get_word_attr(sym::inline);
-    let pub_underscore = import.vis.node.is_pub() && name == kw::Underscore;
+    let pub_underscore = visibility.is_public() && name == kw::Underscore;
+    let current_mod = cx.tcx.parent_module_from_def_id(import.def_id);
+    let parent_mod = cx.tcx.parent_module_from_def_id(current_mod);
 
     if pub_underscore {
         if let Some(ref inline) = inline_attr {
@@ -1954,8 +1957,9 @@ fn clean_use_statement(
     // forcefully don't inline if this is not public or if the
     // #[doc(no_inline)] attribute is present.
     // Don't inline doc(hidden) imports so they can be stripped at a later stage.
-    let mut denied = !(import.vis.node.is_pub()
-        || (cx.render_options.document_private && import.vis.node.is_pub_restricted()))
+    let mut denied = !(visibility.is_public()
+        || (cx.render_options.document_private
+            && visibility.is_accessible_from(parent_mod.to_def_id(), cx.tcx)))
         || pub_underscore
         || attrs.iter().any(|a| {
             a.has_name(sym::doc)

src/librustdoc/clean/types.rs

@@ -254,7 +254,7 @@ impl ExternalCrate {
                             as_keyword(Res::Def(DefKind::Mod, id.def_id.to_def_id()))
                         }
                         hir::ItemKind::Use(path, hir::UseKind::Single)
-                            if item.vis.node.is_pub() =>
+                            if tcx.visibility(id.def_id).is_public() =>
                         {
                             as_keyword(path.res.expect_non_local())
                                 .map(|(_, prim)| (id.def_id.to_def_id(), prim))
@@ -320,7 +320,7 @@ impl ExternalCrate {
                             as_primitive(Res::Def(DefKind::Mod, id.def_id.to_def_id()))
                         }
                         hir::ItemKind::Use(path, hir::UseKind::Single)
-                            if item.vis.node.is_pub() =>
+                            if tcx.visibility(id.def_id).is_public() =>
                         {
                             as_primitive(path.res.expect_non_local()).map(|(_, prim)| {
                                 // Pretend the primitive is local.