Rollup of 6 pull requests

Cargo.lock

@@ -1529,9 +1529,9 @@ dependencies = [
 
 [[package]]
 name = "hermit-abi"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fed44880c466736ef9a5c5b5facefb5ed0785676d0c02d612db14e54f0d84286"
+checksum = "443144c8cdadd93ebf52ddb4056d257f5b52c04d3c804e657d19eb73fc33668b"
 dependencies = [
  "compiler_builtins",
  "rustc-std-workspace-alloc",
@@ -1864,7 +1864,7 @@ version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eae7b9aee968036d54dce06cebaefd919e4472e753296daccd6d344e3e2df0c2"
 dependencies = [
- "hermit-abi 0.3.1",
+ "hermit-abi 0.3.2",
  "libc",
  "windows-sys 0.48.0",
 ]
@@ -1881,7 +1881,7 @@ version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "24fddda5af7e54bf7da53067d6e802dbcc381d0a8eef629df528e3ebf68755cb"
 dependencies = [
- "hermit-abi 0.3.1",
+ "hermit-abi 0.3.2",
  "rustix 0.38.2",
  "windows-sys 0.48.0",
 ]
@@ -2396,7 +2396,7 @@ version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4161fcb6d602d4d2081af7c3a45852d875a03dd337a6bfdd6e06407b61342a43"
 dependencies = [
- "hermit-abi 0.3.1",
+ "hermit-abi 0.3.2",
  "libc",
 ]
 
@@ -4819,7 +4819,7 @@ dependencies = [
  "dlmalloc",
  "fortanix-sgx-abi",
  "hashbrown 0.14.0",
- "hermit-abi 0.3.1",
+ "hermit-abi 0.3.2",
  "libc",
  "miniz_oxide",
  "object",

compiler/rustc_codegen_ssa/src/mir/constant.rs

@@ -67,6 +67,20 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
     ) -> Result<Option<ty::ValTree<'tcx>>, ErrorHandled> {
         let uv = match constant.literal {
             mir::ConstantKind::Unevaluated(uv, _) => uv.shrink(),
+            mir::ConstantKind::Ty(c) => match c.kind() {
+                // A constant that came from a const generic but was then used as an argument to old-style
+                // simd_shuffle (passing as argument instead of as a generic param).
+                rustc_type_ir::ConstKind::Value(valtree) => return Ok(Some(valtree)),
+                other => span_bug!(constant.span, "{other:#?}"),
+            },
+            // We should never encounter `ConstantKind::Val` unless MIR opts (like const prop) evaluate
+            // a constant and write that value back into `Operand`s. This could happen, but is unlikely.
+            // Also: all users of `simd_shuffle` are on unstable and already need to take a lot of care
+            // around intrinsics. For an issue to happen here, it would require a macro expanding to a
+            // `simd_shuffle` call without wrapping the constant argument in a `const {}` block, but
+            // the user pass through arbitrary expressions.
+            // FIXME(oli-obk): replace the magic const generic argument of `simd_shuffle` with a real
+            // const generic.
             other => span_bug!(constant.span, "{other:#?}"),
         };
         let uv = self.monomorphize(uv);

compiler/rustc_lint/src/context.rs

@@ -956,6 +956,14 @@ pub trait LintContext: Sized {
                     db.span_note(glob_reexport_span, format!("the name `{}` in the {} namespace is supposed to be publicly re-exported here", name, namespace));
                     db.span_note(private_item_span, "but the private item here shadows it".to_owned());
                 }
+                BuiltinLintDiagnostics::UnusedQualifications { path_span, unqualified_path } => {
+                    db.span_suggestion_verbose(
+                        path_span,
+                        "replace it with the unqualified path",
+                        unqualified_path,
+                        Applicability::MachineApplicable
+                    );
+                }
             }
             // Rewrap `db`, and pass control to the user.
             decorate(db)

compiler/rustc_lint_defs/src/lib.rs

@@ -550,6 +550,12 @@ pub enum BuiltinLintDiagnostics {
         /// The local binding that shadows the glob reexport.
         private_item_span: Span,
     },
+    UnusedQualifications {
+        /// The span of the unnecessarily-qualified path.
+        path_span: Span,
+        /// The replacement unqualified path.
+        unqualified_path: Ident,
+    },
 }
 
 /// Lints that are buffered up early on in the `Session` before the

compiler/rustc_resolve/src/late.rs

@@ -3917,11 +3917,15 @@ impl<'a: 'ast, 'b, 'ast, 'tcx> LateResolutionVisitor<'a, 'b, 'ast, 'tcx> {
             };
             if res == unqualified_result {
                 let lint = lint::builtin::UNUSED_QUALIFICATIONS;
-                self.r.lint_buffer.buffer_lint(
+                self.r.lint_buffer.buffer_lint_with_diagnostic(
                     lint,
                     finalize.node_id,
                     finalize.path_span,
                     "unnecessary qualification",
+                    lint::BuiltinLintDiagnostics::UnusedQualifications {
+                        path_span: finalize.path_span,
+                        unqualified_path: path.last().unwrap().ident
+                    }
                 )
             }
         }

compiler/rustc_smir/src/rustc_smir/mod.rs

@@ -96,9 +96,11 @@ impl<'tcx> Tables<'tcx> {
             },
             ty::Adt(_, _) => todo!(),
             ty::Foreign(_) => todo!(),
-            ty::Str => todo!(),
-            ty::Array(_, _) => todo!(),
-            ty::Slice(_) => todo!(),
+            ty::Str => TyKind::RigidTy(RigidTy::Str),
+            ty::Array(ty, constant) => {
+                TyKind::RigidTy(RigidTy::Array(self.intern_ty(*ty), opaque(constant)))
+            }
+            ty::Slice(ty) => TyKind::RigidTy(RigidTy::Slice(self.intern_ty(*ty))),
             ty::RawPtr(_) => todo!(),
             ty::Ref(_, _, _) => todo!(),
             ty::FnDef(_, _) => todo!(),

compiler/rustc_smir/src/stable_mir/ty.rs

@@ -1,4 +1,7 @@
 use super::with;
+use crate::rustc_internal::Opaque;
+
+type Const = Opaque;
 
 #[derive(Copy, Clone, Debug)]
 pub struct Ty(pub usize);
@@ -21,6 +24,9 @@ pub enum RigidTy {
     Int(IntTy),
     Uint(UintTy),
     Float(FloatTy),
+    Str,
+    Array(Ty, Const),
+    Slice(Ty),
     Tuple(Vec<Ty>),
 }
 

library/std/Cargo.toml

@@ -45,7 +45,7 @@ dlmalloc = { version = "0.2.3", features = ['rustc-dep-of-std'] }
 fortanix-sgx-abi = { version = "0.5.0", features = ['rustc-dep-of-std'], public = true }
 
 [target.'cfg(target_os = "hermit")'.dependencies]
-hermit-abi = { version = "0.3.0", features = ['rustc-dep-of-std'] }
+hermit-abi = { version = "0.3.2", features = ['rustc-dep-of-std'], public = true }
 
 [target.wasm32-wasi.dependencies]
 wasi = { version = "0.11.0", features = ['rustc-dep-of-std'], default-features = false }

library/std/src/collections/hash/set.rs

@@ -65,8 +65,8 @@ use super::map::{map_try_reserve_error, RandomState};
 /// ```
 ///
 /// The easiest way to use `HashSet` with a custom type is to derive
-/// [`Eq`] and [`Hash`]. We must also derive [`PartialEq`], this will in the
-/// future be implied by [`Eq`].
+/// [`Eq`] and [`Hash`]. We must also derive [`PartialEq`],
+/// which is required if [`Eq`] is derived.
 ///
 /// ```
 /// use std::collections::HashSet;

library/std/src/sys/hermit/thread.rs

@@ -1,6 +1,5 @@
 #![allow(dead_code)]
 
-use super::unsupported;
 use crate::ffi::CStr;
 use crate::io;
 use crate::mem;
@@ -99,7 +98,7 @@ impl Thread {
 }
 
 pub fn available_parallelism() -> io::Result<NonZeroUsize> {
-    unsupported()
+    unsafe { Ok(NonZeroUsize::new_unchecked(abi::get_processor_count())) }
 }
 
 pub mod guard {

library/std/src/sys/hermit/time.rs

@@ -40,7 +40,7 @@ impl Timespec {
     }
 
     fn checked_add_duration(&self, other: &Duration) -> Option<Timespec> {
-        let mut secs = self.tv_sec.checked_add_unsigned(other.as_secs())?;
+        let mut secs = self.t.tv_sec.checked_add_unsigned(other.as_secs())?;
 
         // Nano calculations can't overflow because nanos are <1B which fit
         // in a u32.
@@ -53,7 +53,7 @@ impl Timespec {
     }
 
     fn checked_sub_duration(&self, other: &Duration) -> Option<Timespec> {
-        let mut secs = self.tv_sec.checked_sub_unsigned(other.as_secs())?;
+        let mut secs = self.t.tv_sec.checked_sub_unsigned(other.as_secs())?;
 
         // Similar to above, nanos can't overflow.
         let mut nsec = self.t.tv_nsec as i32 - other.subsec_nanos() as i32;

src/bootstrap/test.rs

@@ -867,46 +867,43 @@ impl Step for RustdocJSStd {
     const ONLY_HOSTS: bool = true;
 
     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
-        run.suite_path("tests/rustdoc-js-std")
+        let default = run.builder.config.nodejs.is_some();
+        run.suite_path("tests/rustdoc-js-std").default_condition(default)
     }
 
     fn make_run(run: RunConfig<'_>) {
         run.builder.ensure(RustdocJSStd { target: run.target });
     }
 
     fn run(self, builder: &Builder<'_>) {
-        if let Some(ref nodejs) = builder.config.nodejs {
-            let mut command = Command::new(nodejs);
-            command
-                .arg(builder.src.join("src/tools/rustdoc-js/tester.js"))
-                .arg("--crate-name")
-                .arg("std")
-                .arg("--resource-suffix")
-                .arg(&builder.version)
-                .arg("--doc-folder")
-                .arg(builder.doc_out(self.target))
-                .arg("--test-folder")
-                .arg(builder.src.join("tests/rustdoc-js-std"));
-            for path in &builder.paths {
-                if let Some(p) =
-                    util::is_valid_test_suite_arg(path, "tests/rustdoc-js-std", builder)
-                {
-                    if !p.ends_with(".js") {
-                        eprintln!("A non-js file was given: `{}`", path.display());
-                        panic!("Cannot run rustdoc-js-std tests");
-                    }
-                    command.arg("--test-file").arg(path);
+        let nodejs =
+            builder.config.nodejs.as_ref().expect("need nodejs to run rustdoc-js-std tests");
+        let mut command = Command::new(nodejs);
+        command
+            .arg(builder.src.join("src/tools/rustdoc-js/tester.js"))
+            .arg("--crate-name")
+            .arg("std")
+            .arg("--resource-suffix")
+            .arg(&builder.version)
+            .arg("--doc-folder")
+            .arg(builder.doc_out(self.target))
+            .arg("--test-folder")
+            .arg(builder.src.join("tests/rustdoc-js-std"));
+        for path in &builder.paths {
+            if let Some(p) = util::is_valid_test_suite_arg(path, "tests/rustdoc-js-std", builder) {
+                if !p.ends_with(".js") {
+                    eprintln!("A non-js file was given: `{}`", path.display());
+                    panic!("Cannot run rustdoc-js-std tests");
                 }
+                command.arg("--test-file").arg(path);
             }
-            builder.ensure(crate::doc::Std::new(
-                builder.top_stage,
-                self.target,
-                DocumentationFormat::HTML,
-            ));
-            builder.run(&mut command);
-        } else {
-            builder.info("No nodejs found, skipping \"tests/rustdoc-js-std\" tests");
         }
+        builder.ensure(crate::doc::Std::new(
+            builder.top_stage,
+            self.target,
+            DocumentationFormat::HTML,
+        ));
+        builder.run(&mut command);
     }
 }
 
@@ -922,7 +919,8 @@ impl Step for RustdocJSNotStd {
     const ONLY_HOSTS: bool = true;
 
     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
-        run.suite_path("tests/rustdoc-js")
+        let default = run.builder.config.nodejs.is_some();
+        run.suite_path("tests/rustdoc-js").default_condition(default)
     }
 
     fn make_run(run: RunConfig<'_>) {
@@ -931,18 +929,14 @@ impl Step for RustdocJSNotStd {
     }
 
     fn run(self, builder: &Builder<'_>) {
-        if builder.config.nodejs.is_some() {
-            builder.ensure(Compiletest {
-                compiler: self.compiler,
-                target: self.target,
-                mode: "js-doc-test",
-                suite: "rustdoc-js",
-                path: "tests/rustdoc-js",
-                compare_mode: None,
-            });
-        } else {
-            builder.info("No nodejs found, skipping \"tests/rustdoc-js\" tests");
-        }
+        builder.ensure(Compiletest {
+            compiler: self.compiler,
+            target: self.target,
+            mode: "js-doc-test",
+            suite: "rustdoc-js",
+            path: "tests/rustdoc-js",
+            compare_mode: None,
+        });
     }
 }
 
@@ -1568,6 +1562,8 @@ note: if you're sure you want to do this, please open an issue as to why. In the
 
         if let Some(ref nodejs) = builder.config.nodejs {
             cmd.arg("--nodejs").arg(nodejs);
+        } else if mode == "js-doc-test" {
+            panic!("need nodejs to run js-doc-test suite");
         }
         if let Some(ref npm) = builder.config.npm {
             cmd.arg("--npm").arg(npm);

tests/ui/lint/lint-qualification.stderr

@@ -9,6 +9,10 @@ note: the lint level is defined here
    |
 LL | #![deny(unused_qualifications)]
    |         ^^^^^^^^^^^^^^^^^^^^^
+help: replace it with the unqualified path
+   |
+LL |     bar();
+   |     ~~~
 
 error: aborting due to previous error
 

tests/ui/resolve/unused-qualifications-suggestion.fixed

@@ -0,0 +1,23 @@
+// run-rustfix
+
+#![deny(unused_qualifications)]
+
+mod foo {
+    pub fn bar() {}
+}
+
+mod baz {
+    pub mod qux {
+        pub fn quux() {}
+    }
+}
+
+fn main() {
+    use foo::bar;
+    bar();
+    //~^ ERROR unnecessary qualification
+
+    use baz::qux::quux;
+    quux();
+    //~^ ERROR unnecessary qualification
+}

tests/ui/resolve/unused-qualifications-suggestion.rs

@@ -0,0 +1,23 @@
+// run-rustfix
+
+#![deny(unused_qualifications)]
+
+mod foo {
+    pub fn bar() {}
+}
+
+mod baz {
+    pub mod qux {
+        pub fn quux() {}
+    }
+}
+
+fn main() {
+    use foo::bar;
+    foo::bar();
+    //~^ ERROR unnecessary qualification
+
+    use baz::qux::quux;
+    baz::qux::quux();
+    //~^ ERROR unnecessary qualification
+}

tests/ui/resolve/unused-qualifications-suggestion.stderr

@@ -0,0 +1,29 @@
+error: unnecessary qualification
+  --> $DIR/unused-qualifications-suggestion.rs:17:5
+   |
+LL |     foo::bar();
+   |     ^^^^^^^^
+   |
+note: the lint level is defined here
+  --> $DIR/unused-qualifications-suggestion.rs:3:9
+   |
+LL | #![deny(unused_qualifications)]
+   |         ^^^^^^^^^^^^^^^^^^^^^
+help: replace it with the unqualified path
+   |
+LL |     bar();
+   |     ~~~
+
+error: unnecessary qualification
+  --> $DIR/unused-qualifications-suggestion.rs:21:5
+   |
+LL |     baz::qux::quux();
+   |     ^^^^^^^^^^^^^^
+   |
+help: replace it with the unqualified path
+   |
+LL |     quux();
+   |     ~~~~
+
+error: aborting due to 2 previous errors
+

tests/ui/simd/shuffle.rs

@@ -1,14 +1,21 @@
 //run-pass
 #![feature(repr_simd, platform_intrinsics)]
+#![allow(incomplete_features)]
+#![feature(adt_const_params)]
 
 extern "platform-intrinsic" {
     fn simd_shuffle<T, I, U>(a: T, b: T, i: I) -> U;
+    fn simd_shuffle16<T, U>(x: T, y: T, idx: [u32; 16]) -> U;
 }
 
 #[derive(Copy, Clone)]
 #[repr(simd)]
 struct Simd<T, const N: usize>([T; N]);
 
+pub unsafe fn __shuffle_vector16<const IDX: [u32; 16], T, U>(x: T, y: T) -> U {
+    simd_shuffle16(x, y, IDX)
+}
+
 fn main() {
     const I1: [u32; 4] = [0, 2, 4, 6];
     const I2: [u32; 2] = [1, 5];
@@ -21,4 +28,16 @@ fn main() {
         let y: Simd<u8, 2> = simd_shuffle(a, b, I2);
         assert_eq!(y.0, [1, 5]);
     }
+    // Test that an indirection (via an unnamed constant)
+    // through a const generic parameter also works.
+    // See https://github.com/rust-lang/rust/issues/113500 for details.
+    let a = Simd::<u8, 16>([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]);
+    let b = Simd::<u8, 16>([16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31]);
+    unsafe {
+        __shuffle_vector16::<
+            { [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16] },
+            Simd<u8, 16>,
+            Simd<u8, 16>,
+        >(a, b);
+    }
 }