Auto merge of rust-lang#3059 - rust-lang:rustup-2023-09-12, r=RalfJung

Automatic sync from rustc

.gitignore

@@ -58,6 +58,7 @@ build/
 \#*
 \#*\#
 .#*
+rustc-ice-*.txt
 
 ## Tags
 tags

.mailmap

@@ -205,6 +205,10 @@ Gareth Daniel Smith <garethdanielsmith@gmail.com> gareth <gareth@gareth-N56VM.(n
 Gareth Daniel Smith <garethdanielsmith@gmail.com> Gareth Smith <garethdanielsmith@gmail.com>
 Gauri Kholkar <f2013002@goa.bits-pilani.ac.in>
 Georges Dubus <georges.dubus@gmail.com> <georges.dubus@compiletoi.net>
+Ghost <ghost> <jonasschievink@gmail.com>
+Ghost <ghost> <jonas.schievink@ferrous-systems.com>
+Ghost <ghost> <jonas@schievink.net>
+Ghost <ghost> <Jonas.Schievink@sony.com>
 Giles Cope <gilescope@gmail.com>
 Glen De Cauwsemaecker <decauwsemaecker.glen@gmail.com>
 Graham Fawcett <graham.fawcett@gmail.com> Graham Fawcett <fawcett@uwindsor.ca>

Cargo.lock

@@ -558,7 +558,6 @@ dependencies = [
  "declare_clippy_lint",
  "if_chain",
  "itertools",
- "pulldown-cmark",
  "quine-mc_cluskey",
  "regex",
  "regex-syntax 0.7.2",
@@ -4175,7 +4174,7 @@ dependencies = [
 name = "rustc_parse_format"
 version = "0.0.0"
 dependencies = [
- "rustc_data_structures",
+ "rustc_index",
  "rustc_lexer",
 ]
 

compiler/rustc_abi/src/lib.rs

@@ -1300,12 +1300,18 @@ impl Abi {
         matches!(*self, Abi::Uninhabited)
     }
 
-    /// Returns `true` is this is a scalar type
+    /// Returns `true` if this is a scalar type
     #[inline]
     pub fn is_scalar(&self) -> bool {
         matches!(*self, Abi::Scalar(_))
     }
 
+    /// Returns `true` if this is a bool
+    #[inline]
+    pub fn is_bool(&self) -> bool {
+        matches!(*self, Abi::Scalar(s) if s.is_bool())
+    }
+
     /// Returns the fixed alignment of this ABI, if any is mandated.
     pub fn inherent_align<C: HasDataLayout>(&self, cx: &C) -> Option<AbiAndPrefAlign> {
         Some(match *self {
@@ -1348,6 +1354,23 @@ impl Abi {
             Abi::Uninhabited | Abi::Aggregate { .. } => Abi::Aggregate { sized: true },
         }
     }
+
+    pub fn eq_up_to_validity(&self, other: &Self) -> bool {
+        match (self, other) {
+            // Scalar, Vector, ScalarPair have `Scalar` in them where we ignore validity ranges.
+            // We do *not* ignore the sign since it matters for some ABIs (e.g. s390x).
+            (Abi::Scalar(l), Abi::Scalar(r)) => l.primitive() == r.primitive(),
+            (
+                Abi::Vector { element: element_l, count: count_l },
+                Abi::Vector { element: element_r, count: count_r },
+            ) => element_l.primitive() == element_r.primitive() && count_l == count_r,
+            (Abi::ScalarPair(l1, l2), Abi::ScalarPair(r1, r2)) => {
+                l1.primitive() == r1.primitive() && l2.primitive() == r2.primitive()
+            }
+            // Everything else must be strictly identical.
+            _ => self == other,
+        }
+    }
 }
 
 #[derive(PartialEq, Eq, Hash, Clone, Debug)]
@@ -1686,6 +1709,22 @@ impl LayoutS {
             Abi::Aggregate { sized } => sized && self.size.bytes() == 0,
         }
     }
+
+    /// Checks if these two `Layout` are equal enough to be considered "the same for all function
+    /// call ABIs". Note however that real ABIs depend on more details that are not reflected in the
+    /// `Layout`; the `PassMode` need to be compared as well.
+    pub fn eq_abi(&self, other: &Self) -> bool {
+        // The one thing that we are not capturing here is that for unsized types, the metadata must
+        // also have the same ABI, and moreover that the same metadata leads to the same size. The
+        // 2nd point is quite hard to check though.
+        self.size == other.size
+            && self.is_sized() == other.is_sized()
+            && self.abi.eq_up_to_validity(&other.abi)
+            && self.abi.is_bool() == other.abi.is_bool()
+            && self.align.abi == other.align.abi
+            && self.max_repr_align == other.max_repr_align
+            && self.unadjusted_abi_align == other.unadjusted_abi_align
+    }
 }
 
 #[derive(Copy, Clone, Debug)]

compiler/rustc_ast_lowering/src/index.rs

@@ -2,19 +2,17 @@ use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sorted_map::SortedMap;
 use rustc_hir as hir;
 use rustc_hir::def_id::LocalDefId;
-use rustc_hir::definitions;
 use rustc_hir::intravisit::{self, Visitor};
 use rustc_hir::*;
 use rustc_index::{Idx, IndexVec};
 use rustc_middle::span_bug;
-use rustc_session::Session;
-use rustc_span::source_map::SourceMap;
+use rustc_middle::ty::TyCtxt;
 use rustc_span::{Span, DUMMY_SP};
 
 /// A visitor that walks over the HIR and collects `Node`s into a HIR map.
 pub(super) struct NodeCollector<'a, 'hir> {
-    /// Source map
-    source_map: &'a SourceMap,
+    tcx: TyCtxt<'hir>,
+
     bodies: &'a SortedMap<ItemLocalId, &'hir Body<'hir>>,
 
     /// Outputs
@@ -25,14 +23,11 @@ pub(super) struct NodeCollector<'a, 'hir> {
     parent_node: hir::ItemLocalId,
 
     owner: OwnerId,
-
-    definitions: &'a definitions::Definitions,
 }
 
-#[instrument(level = "debug", skip(sess, definitions, bodies))]
+#[instrument(level = "debug", skip(tcx, bodies))]
 pub(super) fn index_hir<'hir>(
-    sess: &Session,
-    definitions: &definitions::Definitions,
+    tcx: TyCtxt<'hir>,
     item: hir::OwnerNode<'hir>,
     bodies: &SortedMap<ItemLocalId, &'hir Body<'hir>>,
 ) -> (IndexVec<ItemLocalId, Option<ParentedNode<'hir>>>, FxHashMap<LocalDefId, ItemLocalId>) {
@@ -42,8 +37,7 @@ pub(super) fn index_hir<'hir>(
     // used.
     nodes.push(Some(ParentedNode { parent: ItemLocalId::INVALID, node: item.into() }));
     let mut collector = NodeCollector {
-        source_map: sess.source_map(),
-        definitions,
+        tcx,
         owner: item.def_id(),
         parent_node: ItemLocalId::new(0),
         nodes,
@@ -79,11 +73,17 @@ impl<'a, 'hir> NodeCollector<'a, 'hir> {
                     span,
                     "inconsistent HirId at `{:?}` for `{:?}`: \
                      current_dep_node_owner={} ({:?}), hir_id.owner={} ({:?})",
-                    self.source_map.span_to_diagnostic_string(span),
+                    self.tcx.sess.source_map().span_to_diagnostic_string(span),
                     node,
-                    self.definitions.def_path(self.owner.def_id).to_string_no_crate_verbose(),
+                    self.tcx
+                        .definitions_untracked()
+                        .def_path(self.owner.def_id)
+                        .to_string_no_crate_verbose(),
                     self.owner,
-                    self.definitions.def_path(hir_id.owner.def_id).to_string_no_crate_verbose(),
+                    self.tcx
+                        .definitions_untracked()
+                        .def_path(hir_id.owner.def_id)
+                        .to_string_no_crate_verbose(),
                     hir_id.owner,
                 )
             }

compiler/rustc_ast_lowering/src/lib.rs

@@ -671,8 +671,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         } else {
             (None, None)
         };
-        let (nodes, parenting) =
-            index::index_hir(self.tcx.sess, &*self.tcx.definitions_untracked(), node, &bodies);
+        let (nodes, parenting) = index::index_hir(self.tcx, node, &bodies);
         let nodes = hir::OwnerNodes { opt_hash_including_bodies, nodes, bodies };
         let attrs = hir::AttributeMap { map: attrs, opt_hash: attrs_hash };
 
@@ -771,7 +770,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
     /// Intercept all spans entering HIR.
     /// Mark a span as relative to the current owning item.
     fn lower_span(&self, span: Span) -> Span {
-        if self.tcx.sess.opts.incremental_relative_spans() {
+        if self.tcx.sess.opts.incremental.is_some() {
             span.with_parent(Some(self.current_hir_id_owner.def_id))
         } else {
             // Do not make spans relative when not using incremental compilation.

compiler/rustc_borrowck/messages.ftl

@@ -166,6 +166,8 @@ borrowck_returned_lifetime_wrong =
 borrowck_returned_ref_escaped =
     returns a reference to a captured variable which escapes the closure body
 
+borrowck_simd_shuffle_last_const = last argument of `simd_shuffle` is required to be a `const` item
+
 borrowck_suggest_create_freash_reborrow =
     consider reborrowing the `Pin` instead of moving it
 

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -2130,21 +2130,27 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 /// misleading users in cases like `tests/ui/nll/borrowed-temporary-error.rs`.
                 /// We could expand the analysis to suggest hoising all of the relevant parts of
                 /// the users' code to make the code compile, but that could be too much.
-                struct NestedStatementVisitor {
+                /// We found the `prop_expr` by the way to check whether the expression is a `FormatArguments`,
+                /// which is a special case since it's generated by the compiler.
+                struct NestedStatementVisitor<'tcx> {
                     span: Span,
                     current: usize,
                     found: usize,
+                    prop_expr: Option<&'tcx hir::Expr<'tcx>>,
                 }
 
-                impl<'tcx> Visitor<'tcx> for NestedStatementVisitor {
-                    fn visit_block(&mut self, block: &hir::Block<'tcx>) {
+                impl<'tcx> Visitor<'tcx> for NestedStatementVisitor<'tcx> {
+                    fn visit_block(&mut self, block: &'tcx hir::Block<'tcx>) {
                         self.current += 1;
                         walk_block(self, block);
                         self.current -= 1;
                     }
-                    fn visit_expr(&mut self, expr: &hir::Expr<'tcx>) {
+                    fn visit_expr(&mut self, expr: &'tcx hir::Expr<'tcx>) {
                         if self.span == expr.span.source_callsite() {
                             self.found = self.current;
+                            if self.prop_expr.is_none() {
+                                self.prop_expr = Some(expr);
+                            }
                         }
                         walk_expr(self, expr);
                     }
@@ -2162,22 +2168,40 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                             span: proper_span,
                             current: 0,
                             found: 0,
+                            prop_expr: None,
                         };
                         visitor.visit_stmt(stmt);
+
+                        let typeck_results = self.infcx.tcx.typeck(self.mir_def_id());
+                        let expr_ty: Option<Ty<'_>> = visitor.prop_expr.map(|expr| typeck_results.expr_ty(expr).peel_refs());
+
+                        let is_format_arguments_item =
+                            if let Some(expr_ty) = expr_ty
+                               && let ty::Adt(adt, _) = expr_ty.kind() {
+                                    self.infcx.tcx.lang_items().get(LangItem::FormatArguments) == Some(adt.did())
+                               } else {
+                                   false
+                               };
+
                         if visitor.found == 0
                             && stmt.span.contains(proper_span)
                             && let Some(p) = sm.span_to_margin(stmt.span)
                             && let Ok(s) = sm.span_to_snippet(proper_span)
                         {
-                            let addition = format!("let binding = {};\n{}", s, " ".repeat(p));
-                            err.multipart_suggestion_verbose(
-                                msg,
-                                vec![
-                                    (stmt.span.shrink_to_lo(), addition),
-                                    (proper_span, "binding".to_string()),
-                                ],
-                                Applicability::MaybeIncorrect,
-                            );
+                            if !is_format_arguments_item {
+                                let addition = format!("let binding = {};\n{}", s, " ".repeat(p));
+                                err.multipart_suggestion_verbose(
+                                    msg,
+                                    vec![
+                                        (stmt.span.shrink_to_lo(), addition),
+                                        (proper_span, "binding".to_string()),
+                                    ],
+                                    Applicability::MaybeIncorrect,
+                                );
+                            } else {
+                                err.note("the result of `format_args!` can only be assigned directly if no placeholders in it's arguments are used");
+                                err.note("to learn more, visit <https://doc.rust-lang.org/std/macro.format_args.html>");
+                            }
                             suggested = true;
                             break;
                         }