Merge from rustc

Author: RalfJung

.github/workflows/ci.yml

@@ -156,12 +156,6 @@ jobs:
 
       - name: checkout submodules
         run: src/ci/scripts/checkout-submodules.sh
-      
-      - name: Setup Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.x'
-        if: runner.environment == 'github-hosted'
 
       - name: install MinGW
         run: src/ci/scripts/install-mingw.sh

Cargo.lock

@@ -2652,14 +2652,11 @@ version = "0.32.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a6a622008b6e321afc04970976f62ee297fdbaa6f95318ca343e3eebb9648441"
 dependencies = [
- "compiler_builtins",
  "crc32fast",
  "flate2",
  "hashbrown",
  "indexmap",
  "memchr",
- "rustc-std-workspace-alloc",
- "rustc-std-workspace-core",
  "ruzstd 0.5.0",
  "wasmparser",
 ]
@@ -2675,6 +2672,18 @@ dependencies = [
  "ruzstd 0.6.0",
 ]
 
+[[package]]
+name = "object"
+version = "0.36.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "576dfe1fc8f9df304abb159d767a29d0476f7750fbf8aa7ad07816004a207434"
+dependencies = [
+ "compiler_builtins",
+ "memchr",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
 [[package]]
 name = "odht"
 version = "0.3.1"
@@ -4201,6 +4210,7 @@ dependencies = [
  "rustc_middle",
  "rustc_span",
  "rustc_target",
+ "rustc_type_ir",
  "smallvec",
  "tracing",
 ]
@@ -4392,7 +4402,6 @@ dependencies = [
  "rustc_hir_pretty",
  "rustc_index",
  "rustc_macros",
- "rustc_next_trait_solver",
  "rustc_query_system",
  "rustc_serialize",
  "rustc_session",
@@ -4509,6 +4518,7 @@ dependencies = [
  "rustc_serialize",
  "rustc_type_ir",
  "rustc_type_ir_macros",
+ "tracing",
 ]
 
 [[package]]
@@ -5356,7 +5366,7 @@ dependencies = [
  "hermit-abi",
  "libc",
  "miniz_oxide",
- "object 0.32.2",
+ "object 0.36.0",
  "panic_abort",
  "panic_unwind",
  "profiler_builtins",

compiler/rustc_ast/src/ast.rs

@@ -488,6 +488,7 @@ pub struct Crate {
 /// E.g., `#[test]`, `#[derive(..)]`, `#[rustfmt::skip]` or `#[feature = "foo"]`.
 #[derive(Clone, Encodable, Decodable, Debug, HashStable_Generic)]
 pub struct MetaItem {
+    pub unsafety: Safety,
     pub path: Path,
     pub kind: MetaItemKind,
     pub span: Span,
@@ -1392,7 +1393,7 @@ pub enum ExprKind {
     /// An array (e.g, `[a, b, c, d]`).
     Array(ThinVec<P<Expr>>),
     /// Allow anonymous constants from an inline `const` block
-    ConstBlock(P<Expr>),
+    ConstBlock(AnonConst),
     /// A function call
     ///
     /// The first field resolves to the function itself,
@@ -2823,14 +2824,20 @@ pub struct NormalAttr {
 impl NormalAttr {
     pub fn from_ident(ident: Ident) -> Self {
         Self {
-            item: AttrItem { path: Path::from_ident(ident), args: AttrArgs::Empty, tokens: None },
+            item: AttrItem {
+                unsafety: Safety::Default,
+                path: Path::from_ident(ident),
+                args: AttrArgs::Empty,
+                tokens: None,
+            },
             tokens: None,
         }
     }
 }
 
 #[derive(Clone, Encodable, Decodable, Debug, HashStable_Generic)]
 pub struct AttrItem {
+    pub unsafety: Safety,
     pub path: Path,
     pub args: AttrArgs,
     // Tokens for the meta item, e.g. just the `foo` within `#[foo]` or `#![foo]`.

compiler/rustc_ast/src/attr/mod.rs

@@ -1,6 +1,8 @@
 //! Functions dealing with attributes and meta items.
 
-use crate::ast::{AttrArgs, AttrArgsEq, AttrId, AttrItem, AttrKind, AttrStyle, AttrVec, Attribute};
+use crate::ast::{
+    AttrArgs, AttrArgsEq, AttrId, AttrItem, AttrKind, AttrStyle, AttrVec, Attribute, Safety,
+};
 use crate::ast::{DelimArgs, Expr, ExprKind, LitKind, MetaItemLit};
 use crate::ast::{MetaItem, MetaItemKind, NestedMetaItem, NormalAttr};
 use crate::ast::{Path, PathSegment, DUMMY_NODE_ID};
@@ -238,7 +240,12 @@ impl AttrItem {
     }
 
     pub fn meta(&self, span: Span) -> Option<MetaItem> {
-        Some(MetaItem { path: self.path.clone(), kind: self.meta_kind()?, span })
+        Some(MetaItem {
+            unsafety: Safety::Default,
+            path: self.path.clone(),
+            kind: self.meta_kind()?,
+            span,
+        })
     }
 
     pub fn meta_kind(&self) -> Option<MetaItemKind> {
@@ -371,7 +378,10 @@ impl MetaItem {
             _ => path.span.hi(),
         };
         let span = path.span.with_hi(hi);
-        Some(MetaItem { path, kind, span })
+        // FIXME: This parses `unsafe()` not as unsafe attribute syntax in `MetaItem`,
+        // but as a parenthesized list. This (and likely `MetaItem`) should be changed in
+        // such a way that builtin macros don't accept extraneous `unsafe()`.
+        Some(MetaItem { unsafety: Safety::Default, path, kind, span })
     }
 }
 
@@ -555,11 +565,12 @@ pub fn mk_doc_comment(
 pub fn mk_attr(
     g: &AttrIdGenerator,
     style: AttrStyle,
+    unsafety: Safety,
     path: Path,
     args: AttrArgs,
     span: Span,
 ) -> Attribute {
-    mk_attr_from_item(g, AttrItem { path, args, tokens: None }, None, style, span)
+    mk_attr_from_item(g, AttrItem { unsafety, path, args, tokens: None }, None, style, span)
 }
 
 pub fn mk_attr_from_item(
@@ -577,15 +588,22 @@ pub fn mk_attr_from_item(
     }
 }
 
-pub fn mk_attr_word(g: &AttrIdGenerator, style: AttrStyle, name: Symbol, span: Span) -> Attribute {
+pub fn mk_attr_word(
+    g: &AttrIdGenerator,
+    style: AttrStyle,
+    unsafety: Safety,
+    name: Symbol,
+    span: Span,
+) -> Attribute {
     let path = Path::from_ident(Ident::new(name, span));
     let args = AttrArgs::Empty;
-    mk_attr(g, style, path, args, span)
+    mk_attr(g, style, unsafety, path, args, span)
 }
 
 pub fn mk_attr_nested_word(
     g: &AttrIdGenerator,
     style: AttrStyle,
+    unsafety: Safety,
     outer: Symbol,
     inner: Symbol,
     span: Span,
@@ -601,12 +619,13 @@ pub fn mk_attr_nested_word(
         delim: Delimiter::Parenthesis,
         tokens: inner_tokens,
     });
-    mk_attr(g, style, path, attr_args, span)
+    mk_attr(g, style, unsafety, path, attr_args, span)
 }
 
 pub fn mk_attr_name_value_str(
     g: &AttrIdGenerator,
     style: AttrStyle,
+    unsafety: Safety,
     name: Symbol,
     val: Symbol,
     span: Span,
@@ -621,7 +640,7 @@ pub fn mk_attr_name_value_str(
     });
     let path = Path::from_ident(Ident::new(name, span));
     let args = AttrArgs::Eq(span, AttrArgsEq::Ast(expr));
-    mk_attr(g, style, path, args, span)
+    mk_attr(g, style, unsafety, path, args, span)
 }
 
 pub fn filter_by_name(attrs: &[Attribute], name: Symbol) -> impl Iterator<Item = &Attribute> {

compiler/rustc_ast/src/mut_visit.rs

@@ -647,8 +647,10 @@ fn noop_visit_attribute<T: MutVisitor>(attr: &mut Attribute, vis: &mut T) {
     let Attribute { kind, id: _, style: _, span } = attr;
     match kind {
         AttrKind::Normal(normal) => {
-            let NormalAttr { item: AttrItem { path, args, tokens }, tokens: attr_tokens } =
-                &mut **normal;
+            let NormalAttr {
+                item: AttrItem { unsafety: _, path, args, tokens },
+                tokens: attr_tokens,
+            } = &mut **normal;
             vis.visit_path(path);
             visit_attr_args(args, vis);
             visit_lazy_tts(tokens, vis);
@@ -678,7 +680,7 @@ fn noop_visit_meta_list_item<T: MutVisitor>(li: &mut NestedMetaItem, vis: &mut T
 }
 
 fn noop_visit_meta_item<T: MutVisitor>(mi: &mut MetaItem, vis: &mut T) {
-    let MetaItem { path: _, kind, span } = mi;
+    let MetaItem { unsafety: _, path: _, kind, span } = mi;
     match kind {
         MetaItemKind::Word => {}
         MetaItemKind::List(mis) => visit_thin_vec(mis, |mi| vis.visit_meta_list_item(mi)),
@@ -840,7 +842,7 @@ fn visit_nonterminal<T: MutVisitor>(nt: &mut token::Nonterminal, vis: &mut T) {
         token::NtTy(ty) => vis.visit_ty(ty),
         token::NtLiteral(expr) => vis.visit_expr(expr),
         token::NtMeta(item) => {
-            let AttrItem { path, args, tokens } = item.deref_mut();
+            let AttrItem { unsafety: _, path, args, tokens } = item.deref_mut();
             vis.visit_path(path);
             visit_attr_args(args, vis);
             visit_lazy_tts(tokens, vis);
@@ -1417,7 +1419,7 @@ pub fn noop_visit_expr<T: MutVisitor>(
     match kind {
         ExprKind::Array(exprs) => visit_thin_exprs(exprs, vis),
         ExprKind::ConstBlock(anon_const) => {
-            vis.visit_expr(anon_const);
+            vis.visit_anon_const(anon_const);
         }
         ExprKind::Repeat(expr, count) => {
             vis.visit_expr(expr);

compiler/rustc_ast/src/visit.rs

@@ -959,7 +959,7 @@ pub fn walk_expr<'a, V: Visitor<'a>>(visitor: &mut V, expression: &'a Expr) -> V
         ExprKind::Array(subexpressions) => {
             walk_list!(visitor, visit_expr, subexpressions);
         }
-        ExprKind::ConstBlock(anon_const) => try_visit!(visitor.visit_expr(anon_const)),
+        ExprKind::ConstBlock(anon_const) => try_visit!(visitor.visit_anon_const(anon_const)),
         ExprKind::Repeat(element, count) => {
             try_visit!(visitor.visit_expr(element));
             try_visit!(visitor.visit_anon_const(count));

compiler/rustc_ast_lowering/src/expr.rs

@@ -75,8 +75,12 @@ impl<'hir> LoweringContext<'_, 'hir> {
             let kind = match &e.kind {
                 ExprKind::Array(exprs) => hir::ExprKind::Array(self.lower_exprs(exprs)),
                 ExprKind::ConstBlock(c) => {
-                    self.has_inline_consts = true;
-                    hir::ExprKind::ConstBlock(self.lower_expr(c))
+                    let c = self.with_new_scopes(c.value.span, |this| hir::ConstBlock {
+                        def_id: this.local_def_id(c.id),
+                        hir_id: this.lower_node_id(c.id),
+                        body: this.lower_const_body(c.value.span, Some(&c.value)),
+                    });
+                    hir::ExprKind::ConstBlock(c)
                 }
                 ExprKind::Repeat(expr, count) => {
                     let expr = self.lower_expr(expr);
@@ -1801,6 +1805,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
         let attr = attr::mk_attr_nested_word(
             &self.tcx.sess.psess.attr_id_generator,
             AttrStyle::Outer,
+            Safety::Default,
             sym::allow,
             sym::unreachable_code,
             self.lower_span(span),

compiler/rustc_ast_lowering/src/index.rs

@@ -236,6 +236,14 @@ impl<'a, 'hir> Visitor<'hir> for NodeCollector<'a, 'hir> {
         });
     }
 
+    fn visit_inline_const(&mut self, constant: &'hir ConstBlock) {
+        self.insert(DUMMY_SP, constant.hir_id, Node::ConstBlock(constant));
+
+        self.with_parent(constant.hir_id, |this| {
+            intravisit::walk_inline_const(this, constant);
+        });
+    }
+
     fn visit_expr(&mut self, expr: &'hir Expr<'hir>) {
         self.insert(expr.span, expr.hir_id, Node::Expr(expr));
 

compiler/rustc_ast_lowering/src/lib.rs

@@ -96,8 +96,6 @@ struct LoweringContext<'a, 'hir> {
 
     /// Bodies inside the owner being lowered.
     bodies: Vec<(hir::ItemLocalId, &'hir hir::Body<'hir>)>,
-    /// Whether there were inline consts that typeck will split out into bodies
-    has_inline_consts: bool,
     /// Attributes inside the owner being lowered.
     attrs: SortedMap<hir::ItemLocalId, &'hir [Attribute]>,
     /// Collect items that were created by lowering the current owner.
@@ -160,7 +158,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
             item_local_id_counter: hir::ItemLocalId::ZERO,
             node_id_to_local_id: Default::default(),
             trait_map: Default::default(),
-            has_inline_consts: false,
 
             // Lowering state.
             catch_scope: None,
@@ -570,7 +567,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
 
         let current_attrs = std::mem::take(&mut self.attrs);
         let current_bodies = std::mem::take(&mut self.bodies);
-        let current_has_inline_consts = std::mem::take(&mut self.has_inline_consts);
         let current_node_ids = std::mem::take(&mut self.node_id_to_local_id);
         let current_trait_map = std::mem::take(&mut self.trait_map);
         let current_owner =
@@ -597,7 +593,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
 
         self.attrs = current_attrs;
         self.bodies = current_bodies;
-        self.has_inline_consts = current_has_inline_consts;
         self.node_id_to_local_id = current_node_ids;
         self.trait_map = current_trait_map;
         self.current_hir_id_owner = current_owner;
@@ -634,7 +629,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         let attrs = std::mem::take(&mut self.attrs);
         let mut bodies = std::mem::take(&mut self.bodies);
         let trait_map = std::mem::take(&mut self.trait_map);
-        let has_inline_consts = std::mem::take(&mut self.has_inline_consts);
 
         #[cfg(debug_assertions)]
         for (id, attrs) in attrs.iter() {
@@ -652,7 +646,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
             self.tcx.hash_owner_nodes(node, &bodies, &attrs);
         let num_nodes = self.item_local_id_counter.as_usize();
         let (nodes, parenting) = index::index_hir(self.tcx, node, &bodies, num_nodes);
-        let nodes = hir::OwnerNodes { opt_hash_including_bodies, nodes, bodies, has_inline_consts };
+        let nodes = hir::OwnerNodes { opt_hash_including_bodies, nodes, bodies };
         let attrs = hir::AttributeMap { map: attrs, opt_hash: attrs_hash };
 
         self.arena.alloc(hir::OwnerInfo { nodes, parenting, attrs, trait_map })
@@ -911,6 +905,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         let kind = match attr.kind {
             AttrKind::Normal(ref normal) => AttrKind::Normal(P(NormalAttr {
                 item: AttrItem {
+                    unsafety: normal.item.unsafety,
                     path: normal.item.path.clone(),
                     args: self.lower_attr_args(&normal.item.args),
                     tokens: None,

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -561,6 +561,7 @@ pub fn check_crate(krate: &ast::Crate, sess: &Session, features: &Features) {
     gate_all!(mut_ref, "mutable by-reference bindings are experimental");
     gate_all!(precise_capturing, "precise captures on `impl Trait` are experimental");
     gate_all!(global_registration, "global registration is experimental");
+    gate_all!(unsafe_attributes, "`#[unsafe()]` markers for attributes are experimental");
 
     if !visitor.features.never_patterns {
         if let Some(spans) = spans.get(&sym::never_patterns) {