Rollup of 13 pull requests

.github/workflows/ci.yml

@@ -11,11 +11,9 @@ name: CI
 on:
   push:
     branches:
-      - auto
-      - try
-      - try-perf
-      - automation/bors/try
       - automation/bors/auto
+      - automation/bors/try
+      - try-perf
   pull_request:
     branches:
       - "**"
@@ -33,9 +31,10 @@ defaults:
 
 concurrency:
   # For a given workflow, if we push to the same branch, cancel all previous builds on that branch.
-  # We add an exception for try builds (try branch) and unrolled rollup builds (try-perf), which
-  # are all triggered on the same branch, but which should be able to run concurrently.
-  group: ${{ github.workflow }}-${{ ((github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf' || github.ref == 'refs/heads/automation/bors/try') && github.sha) || github.ref }}
+  # We add an exception for try builds (automation/bors/try branch) and unrolled rollup builds
+  # (try-perf), which are all triggered on the same branch, but which should be able to run
+  # concurrently.
+  group: ${{ github.workflow }}-${{ ((github.ref == 'refs/heads/try-perf' || github.ref == 'refs/heads/automation/bors/try') && github.sha) || github.ref }}
   cancel-in-progress: true
 env:
   TOOLSTATE_REPO: "https://github.com/rust-lang-nursery/rust-toolstate"
@@ -57,7 +56,7 @@ jobs:
       - name: Test citool
         # Only test citool on the auto branch, to reduce latency of the calculate matrix job
         # on PR/try builds.
-        if: ${{ github.ref == 'refs/heads/auto' || github.ref == 'refs/heads/automation/bors/auto' }}
+        if: ${{ github.ref == 'refs/heads/automation/bors/auto' }}
         run: |
           cd src/ci/citool
           CARGO_INCREMENTAL=0 cargo test
@@ -80,7 +79,7 @@ jobs:
     # access the environment.
     #
     # We only enable the environment for the rust-lang/rust repository, so that CI works on forks.
-    environment: ${{ ((github.repository == 'rust-lang/rust' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf' || github.ref == 'refs/heads/automation/bors/try' || github.ref == 'refs/heads/auto' || github.ref == 'refs/heads/automation/bors/auto')) && 'bors') || '' }}
+    environment: ${{ ((github.repository == 'rust-lang/rust' && (github.ref == 'refs/heads/try-perf' || github.ref == 'refs/heads/automation/bors/try' || github.ref == 'refs/heads/automation/bors/auto')) && 'bors') || '' }}
     env:
       CI_JOB_NAME: ${{ matrix.name }}
       CI_JOB_DOC_URL: ${{ matrix.doc_url }}
@@ -314,7 +313,7 @@ jobs:
     needs: [ calculate_matrix, job ]
     # !cancelled() executes the job regardless of whether the previous jobs passed or failed
     if: ${{ !cancelled() && contains(fromJSON('["auto", "try"]'), needs.calculate_matrix.outputs.run_type) }}
-    environment: ${{ ((github.repository == 'rust-lang/rust' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf' || github.ref == 'refs/heads/automation/bors/try' || github.ref == 'refs/heads/auto' || github.ref == 'refs/heads/automation/bors/auto')) && 'bors') || '' }}
+    environment: ${{ ((github.repository == 'rust-lang/rust' && (github.ref == 'refs/heads/try-perf' || github.ref == 'refs/heads/automation/bors/try' || github.ref == 'refs/heads/automation/bors/auto')) && 'bors') || '' }}
     steps:
       - name: checkout the source code
         uses: actions/checkout@v5

compiler/rustc_attr_parsing/src/attributes/mod.rs

@@ -57,6 +57,7 @@ pub(crate) mod pin_v2;
 pub(crate) mod proc_macro_attrs;
 pub(crate) mod prototype;
 pub(crate) mod repr;
+pub(crate) mod rustc_dump;
 pub(crate) mod rustc_internal;
 pub(crate) mod semantics;
 pub(crate) mod stability;

compiler/rustc_attr_parsing/src/attributes/rustc_dump.rs

@@ -0,0 +1,62 @@
+use rustc_hir::Target;
+use rustc_hir::attrs::AttributeKind;
+use rustc_span::{Span, Symbol, sym};
+
+use crate::attributes::prelude::Allow;
+use crate::attributes::{NoArgsAttributeParser, OnDuplicate};
+use crate::context::Stage;
+use crate::target_checking::AllowedTargets;
+
+pub(crate) struct RustcDumpUserArgs;
+
+impl<S: Stage> NoArgsAttributeParser<S> for RustcDumpUserArgs {
+    const PATH: &[Symbol] = &[sym::rustc_dump_user_args];
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
+    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[Allow(Target::Fn)]);
+    const CREATE: fn(Span) -> AttributeKind = |_| AttributeKind::RustcDumpUserArgs;
+}
+
+pub(crate) struct RustcDumpDefParents;
+
+impl<S: Stage> NoArgsAttributeParser<S> for RustcDumpDefParents {
+    const PATH: &[Symbol] = &[sym::rustc_dump_def_parents];
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
+    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[Allow(Target::Fn)]);
+    const CREATE: fn(Span) -> AttributeKind = |_| AttributeKind::RustcDumpDefParents;
+}
+
+pub(crate) struct RustcDumpItemBounds;
+
+impl<S: Stage> NoArgsAttributeParser<S> for RustcDumpItemBounds {
+    const PATH: &[Symbol] = &[sym::rustc_dump_item_bounds];
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
+    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[Allow(Target::AssocTy)]);
+    const CREATE: fn(Span) -> AttributeKind = |_| AttributeKind::RustcDumpItemBounds;
+}
+
+pub(crate) struct RustcDumpPredicates;
+
+impl<S: Stage> NoArgsAttributeParser<S> for RustcDumpPredicates {
+    const PATH: &[Symbol] = &[sym::rustc_dump_predicates];
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
+    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[
+        Allow(Target::Struct),
+        Allow(Target::Enum),
+        Allow(Target::Union),
+        Allow(Target::Trait),
+        Allow(Target::AssocTy),
+    ]);
+    const CREATE: fn(Span) -> AttributeKind = |_| AttributeKind::RustcDumpPredicates;
+}
+
+pub(crate) struct RustcDumpVtable;
+
+impl<S: Stage> NoArgsAttributeParser<S> for RustcDumpVtable {
+    const PATH: &[Symbol] = &[sym::rustc_dump_vtable];
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
+    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[
+        Allow(Target::Impl { of_trait: true }),
+        Allow(Target::TyAlias),
+    ]);
+    const CREATE: fn(Span) -> AttributeKind = AttributeKind::RustcDumpVtable;
+}

compiler/rustc_attr_parsing/src/context.rs

@@ -63,6 +63,10 @@ use crate::attributes::proc_macro_attrs::{
 };
 use crate::attributes::prototype::CustomMirParser;
 use crate::attributes::repr::{AlignParser, AlignStaticParser, ReprParser};
+use crate::attributes::rustc_dump::{
+    RustcDumpDefParents, RustcDumpItemBounds, RustcDumpPredicates, RustcDumpUserArgs,
+    RustcDumpVtable,
+};
 use crate::attributes::rustc_internal::{
     RustcHasIncoherentInherentImplsParser, RustcLayoutScalarValidRangeEndParser,
     RustcLayoutScalarValidRangeStartParser, RustcLegacyConstGenericsParser,
@@ -267,6 +271,11 @@ attribute_parsers!(
         Single<WithoutArgs<ProcMacroParser>>,
         Single<WithoutArgs<PubTransparentParser>>,
         Single<WithoutArgs<RustcCoherenceIsCoreParser>>,
+        Single<WithoutArgs<RustcDumpDefParents>>,
+        Single<WithoutArgs<RustcDumpItemBounds>>,
+        Single<WithoutArgs<RustcDumpPredicates>>,
+        Single<WithoutArgs<RustcDumpUserArgs>>,
+        Single<WithoutArgs<RustcDumpVtable>>,
         Single<WithoutArgs<RustcHasIncoherentInherentImplsParser>>,
         Single<WithoutArgs<RustcLintDiagnosticsParser>>,
         Single<WithoutArgs<RustcLintOptTyParser>>,

compiler/rustc_const_eval/src/const_eval/type_info.rs

@@ -3,7 +3,7 @@ use rustc_hir::LangItem;
 use rustc_middle::mir::interpret::CtfeProvenance;
 use rustc_middle::span_bug;
 use rustc_middle::ty::layout::TyAndLayout;
-use rustc_middle::ty::{self, ScalarInt, Ty};
+use rustc_middle::ty::{self, Const, ScalarInt, Ty};
 use rustc_span::{Symbol, sym};
 
 use crate::const_eval::CompileTimeMachine;
@@ -56,14 +56,21 @@ impl<'tcx> InterpCx<'tcx, CompileTimeMachine<'tcx>> {
                             self.write_tuple_fields(tuple_place, fields, ty)?;
                             variant
                         }
+                        ty::Array(ty, len) => {
+                            let (variant, variant_place) = downcast(sym::Array)?;
+                            let array_place = self.project_field(&variant_place, FieldIdx::ZERO)?;
+
+                            self.write_array_type_info(array_place, *ty, *len)?;
+
+                            variant
+                        }
                         // For now just merge all primitives into one `Leaf` variant with no data
                         ty::Uint(_) | ty::Int(_) | ty::Float(_) | ty::Char | ty::Bool => {
                             downcast(sym::Leaf)?.0
                         }
                         ty::Adt(_, _)
                         | ty::Foreign(_)
                         | ty::Str
-                        | ty::Array(_, _)
                         | ty::Pat(_, _)
                         | ty::Slice(_)
                         | ty::RawPtr(..)
@@ -172,4 +179,28 @@ impl<'tcx> InterpCx<'tcx, CompileTimeMachine<'tcx>> {
         }
         interp_ok(())
     }
+
+    pub(crate) fn write_array_type_info(
+        &mut self,
+        place: impl Writeable<'tcx, CtfeProvenance>,
+        ty: Ty<'tcx>,
+        len: Const<'tcx>,
+    ) -> InterpResult<'tcx> {
+        // Iterate over all fields of `type_info::Array`.
+        for (field_idx, field) in
+            place.layout().ty.ty_adt_def().unwrap().non_enum_variant().fields.iter_enumerated()
+        {
+            let field_place = self.project_field(&place, field_idx)?;
+
+            match field.name {
+                // Write the `TypeId` of the array's elements to the `element_ty` field.
+                sym::element_ty => self.write_type_id(ty, &field_place)?,
+                // Write the length of the array to the `len` field.
+                sym::len => self.write_scalar(len.to_leaf(), &field_place)?,
+                other => span_bug!(self.tcx.def_span(field.did), "unimplemented field {other}"),
+            }
+        }
+
+        interp_ok(())
+    }
 }

compiler/rustc_driver_impl/src/lib.rs

@@ -765,30 +765,35 @@ fn print_crate_info(
                 for (name, expected_values) in &sess.psess.check_config.expecteds {
                     use crate::config::ExpectedValues;
                     match expected_values {
-                        ExpectedValues::Any => check_cfgs.push(format!("{name}=any()")),
+                        ExpectedValues::Any => {
+                            check_cfgs.push(format!("cfg({name}, values(any()))"))
+                        }
                         ExpectedValues::Some(values) => {
-                            if !values.is_empty() {
-                                check_cfgs.extend(values.iter().map(|value| {
+                            let mut values: Vec<_> = values
+                                .iter()
+                                .map(|value| {
                                     if let Some(value) = value {
-                                        format!("{name}=\"{value}\"")
+                                        format!("\"{value}\"")
                                     } else {
-                                        name.to_string()
+                                        "none()".to_string()
                                     }
-                                }))
-                            } else {
-                                check_cfgs.push(format!("{name}="))
-                            }
+                                })
+                                .collect();
+
+                            values.sort_unstable();
+
+                            let values = values.join(", ");
+
+                            check_cfgs.push(format!("cfg({name}, values({values}))"))
                         }
                     }
                 }
 
                 check_cfgs.sort_unstable();
-                if !sess.psess.check_config.exhaustive_names {
-                    if !sess.psess.check_config.exhaustive_values {
-                        println_info!("any()=any()");
-                    } else {
-                        println_info!("any()");
-                    }
+                if !sess.psess.check_config.exhaustive_names
+                    && sess.psess.check_config.exhaustive_values
+                {
+                    println_info!("cfg(any())");
                 }
                 for check_cfg in check_cfgs {
                     println_info!("{check_cfg}");

compiler/rustc_hir/src/attrs/data_structures.rs

@@ -906,6 +906,21 @@ pub enum AttributeKind {
     /// Represents `#[rustc_coherence_is_core]`
     RustcCoherenceIsCore(Span),
 
+    /// Represents `#[rustc_dump_def_parents]`
+    RustcDumpDefParents,
+
+    /// Represents `#[rustc_dump_item_bounds]`
+    RustcDumpItemBounds,
+
+    /// Represents `#[rustc_dump_predicates]`
+    RustcDumpPredicates,
+
+    /// Represents `#[rustc_dump_user_args]`
+    RustcDumpUserArgs,
+
+    /// Represents `#[rustc_dump_vtable]`
+    RustcDumpVtable(Span),
+
     /// Represents `#[rustc_has_incoherent_inherent_impls]`
     RustcHasIncoherentInherentImpls,
 

compiler/rustc_hir/src/attrs/encode_cross_crate.rs

@@ -97,6 +97,11 @@ impl AttributeKind {
             Repr { .. } => No,
             RustcBuiltinMacro { .. } => Yes,
             RustcCoherenceIsCore(..) => No,
+            RustcDumpDefParents => No,
+            RustcDumpItemBounds => No,
+            RustcDumpPredicates => No,
+            RustcDumpUserArgs => No,
+            RustcDumpVtable(..) => No,
             RustcHasIncoherentInherentImpls => Yes,
             RustcLayoutScalarValidRangeEnd(..) => Yes,
             RustcLayoutScalarValidRangeStart(..) => Yes,

compiler/rustc_hir_analysis/messages.ftl

@@ -166,8 +166,9 @@ hir_analysis_duplicate_precise_capture = cannot capture parameter `{$name}` twic
     .label = parameter captured again here
 
 hir_analysis_eii_with_generics =
-    #[{$eii_name}] cannot have generic parameters other than lifetimes
+    `{$impl_name}` cannot have generic parameters other than lifetimes
     .label = required by this attribute
+    .help = `#[{$eii_name}]` marks the implementation of an "externally implementable item"
 
 hir_analysis_empty_specialization = specialization impl does not specialize any associated items
     .note = impl is a specialization of this impl

compiler/rustc_hir_analysis/src/check/check.rs

@@ -974,12 +974,19 @@ pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Result<(),
                         (0, _) => ("const", "consts", None),
                         _ => ("type or const", "types or consts", None),
                     };
+                    let name =
+                        if find_attr!(tcx.get_all_attrs(def_id), AttributeKind::EiiForeignItem) {
+                            "externally implementable items"
+                        } else {
+                            "foreign items"
+                        };
+
                     let span = tcx.def_span(def_id);
                     struct_span_code_err!(
                         tcx.dcx(),
                         span,
                         E0044,
-                        "foreign items may not have {kinds} parameters",
+                        "{name} may not have {kinds} parameters",
                     )
                     .with_span_label(span, format!("can't have {kinds} parameters"))
                     .with_help(

compiler/rustc_hir_analysis/src/check/compare_eii.rs

@@ -8,8 +8,9 @@ use std::iter;
 
 use rustc_data_structures::fx::FxIndexSet;
 use rustc_errors::{Applicability, E0806, struct_span_code_err};
+use rustc_hir::attrs::{AttributeKind, EiiImplResolution};
 use rustc_hir::def_id::{DefId, LocalDefId};
-use rustc_hir::{self as hir, FnSig, HirId, ItemKind};
+use rustc_hir::{self as hir, FnSig, HirId, ItemKind, find_attr};
 use rustc_infer::infer::{self, InferCtxt, TyCtxtInferExt};
 use rustc_infer::traits::{ObligationCause, ObligationCauseCode};
 use rustc_middle::ty::error::{ExpectedFound, TypeError};
@@ -169,11 +170,23 @@ fn check_no_generics<'tcx>(
     eii_attr_span: Span,
 ) -> Result<(), ErrorGuaranteed> {
     let generics = tcx.generics_of(external_impl);
-    if generics.own_requires_monomorphization() {
+    if generics.own_requires_monomorphization()
+        // When an EII implementation is automatically generated by the `#[eii]` macro,
+        // it will directly refer to the foreign item, not through a macro.
+        // We don't want to emit this error if it's an implementation that's generated by the `#[eii]` macro,
+        // since in that case it looks like a duplicate error: the declaration of the EII already can't contain generics.
+        // So, we check here if at least one of the eii impls has ImplResolution::Macro, which indicates it's
+        // not generated as part of the declaration.
+        && find_attr!(
+            tcx.get_all_attrs(external_impl),
+            AttributeKind::EiiImpls(impls) if impls.iter().any(|i| matches!(i.resolution, EiiImplResolution::Macro(_)))
+        )
+    {
         tcx.dcx().emit_err(EiiWithGenerics {
             span: tcx.def_span(external_impl),
             attr: eii_attr_span,
             eii_name,
+            impl_name: tcx.item_name(external_impl),
         });
     }