Auto merge of #18364 - lnicola:sync-from-rust, r=lnicola

minor: sync from downstream

.github/workflows/ci.yml

@@ -104,6 +104,18 @@ jobs:
         with:
           fetch-depth: 2
 
+      # Free up disk space on Linux by removing preinstalled components that
+      # we do not need. We do this to enable some of the less resource
+      # intensive jobs to run on free runners, which however also have
+      # less disk space.
+      - name: free up disk space
+        uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be
+        if: contains(matrix.os, 'ubuntu')
+        with:
+          # Removing packages with APT saves ~5 GiB, but takes several
+          # minutes (and potentially removes important packages).
+          large-packages: false
+
       # Rust Log Analyzer can't currently detect the PR number of a GitHub
       # Actions build on its own, so a hint in the log message is needed to
       # point it in the right direction.
@@ -194,6 +206,11 @@ jobs:
       - name: create github artifacts
         run: src/ci/scripts/create-doc-artifacts.sh
 
+      - name: print disk usage
+        run: |
+          echo "disk usage:"
+          df -h
+
       - name: upload artifacts to github
         uses: actions/upload-artifact@v4
         with:

.gitignore

@@ -57,6 +57,8 @@ build/
 /src/tools/x/target
 # Created by default with `src/ci/docker/run.sh`
 /obj/
+# Created by nix dev shell / .envrc
+src/tools/nix-dev-shell/flake.lock
 
 ## ICE reports
 rustc-ice-*.txt

.mailmap

@@ -256,6 +256,7 @@ Jakub Adam Wieczorek <jakub.adam.wieczorek@gmail.com>
 Jakub Adam Wieczorek <jakub.adam.wieczorek@gmail.com> <jakub.bukaj@yahoo.com>
 Jakub Adam Wieczorek <jakub.adam.wieczorek@gmail.com> <jakub@jakub.cc>
 Jakub Adam Wieczorek <jakub.adam.wieczorek@gmail.com> <jakubw@jakubw.net>
+Jakub Beránek <berykubik@gmail.com> <jakub.beranek@vsb.cz>
 James [Undefined] <tpzker@thepuzzlemaker.info>
 James Deng <cnjamesdeng@gmail.com> <cnJamesDeng@gmail.com>
 James Hinshelwood <jameshinshelwood1@gmail.com> <james.hinshelwood@bigpayme.com>

Cargo.lock

@@ -377,7 +377,7 @@ dependencies = [
  "cargo_metadata",
  "directories",
  "rustc-build-sysroot",
- "rustc_tools_util 0.4.0",
+ "rustc_tools_util",
  "rustc_version",
  "serde",
  "serde_json",
@@ -537,7 +537,7 @@ checksum = "1462739cb27611015575c0c11df5df7601141071f07518d56fcc1be504cbec97"
 
 [[package]]
 name = "clippy"
-version = "0.1.83"
+version = "0.1.84"
 dependencies = [
  "anstream",
  "cargo_metadata",
@@ -550,9 +550,11 @@ dependencies = [
  "if_chain",
  "itertools",
  "parking_lot",
+ "pulldown-cmark 0.11.3",
  "quote",
  "regex",
- "rustc_tools_util 0.3.0",
+ "rinja",
+ "rustc_tools_util",
  "serde",
  "serde_json",
  "syn 2.0.79",
@@ -566,7 +568,7 @@ dependencies = [
 
 [[package]]
 name = "clippy_config"
-version = "0.1.83"
+version = "0.1.84"
 dependencies = [
  "itertools",
  "serde",
@@ -582,20 +584,19 @@ dependencies = [
  "clap",
  "indoc",
  "itertools",
- "opener 0.6.1",
+ "opener",
  "shell-escape",
  "walkdir",
 ]
 
 [[package]]
 name = "clippy_lints"
-version = "0.1.83"
+version = "0.1.84"
 dependencies = [
  "arrayvec",
  "cargo_metadata",
  "clippy_config",
  "clippy_utils",
- "declare_clippy_lint",
  "itertools",
  "quine-mc_cluskey",
  "regex",
@@ -613,7 +614,7 @@ dependencies = [
 
 [[package]]
 name = "clippy_utils"
-version = "0.1.83"
+version = "0.1.84"
 dependencies = [
  "arrayvec",
  "clippy_config",
@@ -919,15 +920,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "declare_clippy_lint"
-version = "0.1.83"
-dependencies = [
- "itertools",
- "quote",
- "syn 2.0.79",
-]
-
 [[package]]
 name = "deranged"
 version = "0.3.11"
@@ -1915,7 +1907,7 @@ dependencies = [
  "anyhow",
  "clap",
  "fs-err",
- "rustc-hash 1.1.0",
+ "rustc-hash 2.0.0",
  "rustdoc-json-types",
  "serde",
  "serde_json",
@@ -2163,7 +2155,7 @@ dependencies = [
  "log",
  "memchr",
  "once_cell",
- "opener 0.7.2",
+ "opener",
  "pulldown-cmark 0.10.3",
  "regex",
  "serde",
@@ -2501,17 +2493,6 @@ dependencies = [
  "stable_deref_trait",
 ]
 
-[[package]]
-name = "opener"
-version = "0.6.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c62dcb6174f9cb326eac248f07e955d5d559c272730b6c03e396b443b562788"
-dependencies = [
- "bstr",
- "normpath",
- "winapi",
-]
-
 [[package]]
 name = "opener"
 version = "0.7.2"
@@ -2879,6 +2860,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "679341d22c78c6c649893cbd6c3278dcbe9fc4faa62fea3a9296ae2b50c14625"
 dependencies = [
  "bitflags 2.6.0",
+ "getopts",
  "memchr",
  "pulldown-cmark-escape 0.11.0",
  "unicase",
@@ -3532,7 +3514,7 @@ dependencies = [
  "memmap2",
  "parking_lot",
  "portable-atomic",
- "rustc-hash 1.1.0",
+ "rustc-hash 2.0.0",
  "rustc-rayon",
  "rustc-stable-hash",
  "rustc_arena",
@@ -4229,7 +4211,7 @@ dependencies = [
 name = "rustc_pattern_analysis"
 version = "0.0.0"
 dependencies = [
- "rustc-hash 1.1.0",
+ "rustc-hash 2.0.0",
  "rustc_apfloat",
  "rustc_arena",
  "rustc_data_structures",
@@ -4460,12 +4442,6 @@ dependencies = [
  "tracing",
 ]
 
-[[package]]
-name = "rustc_tools_util"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8ba09476327c4b70ccefb6180f046ef588c26a24cf5d269a9feba316eb4f029f"
-
 [[package]]
 name = "rustc_tools_util"
 version = "0.4.0"
@@ -4608,6 +4584,7 @@ dependencies = [
  "rustdoc-json-types",
  "serde",
  "serde_json",
+ "sha2",
  "smallvec",
  "tempfile",
  "threadpool",
@@ -4632,7 +4609,7 @@ name = "rustdoc-json-types"
 version = "0.1.0"
 dependencies = [
  "bincode",
- "rustc-hash 1.1.0",
+ "rustc-hash 2.0.0",
  "serde",
  "serde_json",
 ]
@@ -5262,7 +5239,7 @@ dependencies = [
  "ignore",
  "miropt-test-tools",
  "regex",
- "rustc-hash 1.1.0",
+ "rustc-hash 2.0.0",
  "semver",
  "similar",
  "termcolor",
@@ -5593,13 +5570,6 @@ dependencies = [
  "version_check",
 ]
 
-[[package]]
-name = "unicode-bdd"
-version = "0.1.0"
-dependencies = [
- "ucd-parse",
-]
-
 [[package]]
 name = "unicode-bidi"
 version = "0.3.15"
@@ -5649,6 +5619,13 @@ version = "1.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f6ccf251212114b54433ec949fd6a7841275f9ada20dddd2f29e9ceea4501493"
 
+[[package]]
+name = "unicode-table-generator"
+version = "0.1.0"
+dependencies = [
+ "ucd-parse",
+]
+
 [[package]]
 name = "unicode-width"
 version = "0.1.14"

compiler/rustc_abi/src/callconv.rs

@@ -3,18 +3,23 @@ mod abi {
     pub(crate) use crate::Variants;
 }
 
+#[cfg(feature = "nightly")]
 use rustc_macros::HashStable_Generic;
 
-use crate::{Abi, Align, FieldsShape, HasDataLayout, Size, TyAbiInterface, TyAndLayout};
+#[cfg(feature = "nightly")]
+use crate::{Abi, FieldsShape, TyAbiInterface, TyAndLayout};
+use crate::{Align, HasDataLayout, Size};
 
-#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, HashStable_Generic)]
+#[cfg_attr(feature = "nightly", derive(HashStable_Generic))]
+#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
 pub enum RegKind {
     Integer,
     Float,
     Vector,
 }
 
-#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, HashStable_Generic)]
+#[cfg_attr(feature = "nightly", derive(HashStable_Generic))]
+#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
 pub struct Reg {
     pub kind: RegKind,
     pub size: Size,
@@ -108,15 +113,8 @@ impl HomogeneousAggregate {
     }
 }
 
+#[cfg(feature = "nightly")]
 impl<'a, Ty> TyAndLayout<'a, Ty> {
-    /// Returns `true` if this is an aggregate type (including a ScalarPair!)
-    pub fn is_aggregate(&self) -> bool {
-        match self.abi {
-            Abi::Uninhabited | Abi::Scalar(_) | Abi::Vector { .. } => false,
-            Abi::ScalarPair(..) | Abi::Aggregate { .. } => true,
-        }
-    }
-
     /// Returns `Homogeneous` if this layout is an aggregate containing fields of
     /// only a single type (e.g., `(u32, u32)`). Such aggregates are often
     /// special-cased in ABIs.

compiler/rustc_abi/src/layout.rs

@@ -11,8 +11,10 @@ use crate::{
     Variants, WrappingRange,
 };
 
+#[cfg(feature = "nightly")]
 mod ty;
 
+#[cfg(feature = "nightly")]
 pub use ty::{FIRST_VARIANT, FieldIdx, Layout, TyAbiInterface, TyAndLayout, VariantIdx};
 
 // A variant is absent if it's uninhabited and only has ZST fields.
@@ -39,7 +41,7 @@ enum NicheBias {
     End,
 }
 
-#[derive(Copy, Clone, Debug)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
 pub enum LayoutCalculatorError<F> {
     /// An unsized type was found in a location where a sized type was expected.
     ///
@@ -54,6 +56,36 @@ pub enum LayoutCalculatorError<F> {
 
     /// A union had no fields.
     EmptyUnion,
+
+    /// The fields or variants have irreconcilable reprs
+    ReprConflict,
+}
+
+impl<F> LayoutCalculatorError<F> {
+    pub fn without_payload(&self) -> LayoutCalculatorError<()> {
+        match self {
+            LayoutCalculatorError::UnexpectedUnsized(_) => {
+                LayoutCalculatorError::UnexpectedUnsized(())
+            }
+            LayoutCalculatorError::SizeOverflow => LayoutCalculatorError::SizeOverflow,
+            LayoutCalculatorError::EmptyUnion => LayoutCalculatorError::EmptyUnion,
+            LayoutCalculatorError::ReprConflict => LayoutCalculatorError::ReprConflict,
+        }
+    }
+
+    /// Format an untranslated diagnostic for this type
+    ///
+    /// Intended for use by rust-analyzer, as neither it nor `rustc_abi` depend on fluent infra.
+    pub fn fallback_fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str(match self {
+            LayoutCalculatorError::UnexpectedUnsized(_) => {
+                "an unsized type was found where a sized type was expected"
+            }
+            LayoutCalculatorError::SizeOverflow => "size overflow",
+            LayoutCalculatorError::EmptyUnion => "type is a union with no fields",
+            LayoutCalculatorError::ReprConflict => "type has an invalid repr",
+        })
+    }
 }
 
 type LayoutCalculatorResult<FieldIdx, VariantIdx, F> =
@@ -489,6 +521,10 @@ impl<Cx: HasDataLayout> LayoutCalculator<Cx> {
         }
 
         let dl = self.cx.data_layout();
+        // bail if the enum has an incoherent repr that cannot be computed
+        if repr.packed() {
+            return Err(LayoutCalculatorError::ReprConflict);
+        }
 
         let calculate_niche_filling_layout = || -> Option<TmpLayout<FieldIdx, VariantIdx>> {
             if dont_niche_optimize_enum {