Rollup of 8 pull requests

compiler/rustc_codegen_cranelift/example/mini_core.rs

@@ -8,6 +8,7 @@
     rustc_attrs,
     transparent_unions,
     auto_traits,
+    freeze_impls,
     thread_local
 )]
 #![no_core]

compiler/rustc_codegen_gcc/example/mini_core.rs

@@ -1,6 +1,6 @@
 #![feature(
     no_core, lang_items, intrinsics, unboxed_closures, type_ascription, extern_types,
-    decl_macro, rustc_attrs, transparent_unions, auto_traits,
+    decl_macro, rustc_attrs, transparent_unions, auto_traits, freeze_impls,
     thread_local
 )]
 #![no_core]

compiler/rustc_feature/src/unstable.rs

@@ -471,6 +471,8 @@ declare_features! (
     (unstable, fn_align, "1.53.0", Some(82232)),
     /// Support delegating implementation of functions to other already implemented functions.
     (incomplete, fn_delegation, "1.76.0", Some(118212)),
+    /// Allows impls for the Freeze trait.
+    (internal, freeze_impls, "CURRENT_RUSTC_VERSION", Some(121675)),
     /// Allows defining gen blocks and `gen fn`.
     (unstable, gen_blocks, "1.75.0", Some(117078)),
     /// Infer generic args for both consts and types.

compiler/rustc_hir_analysis/src/coherence/mod.rs

@@ -10,6 +10,7 @@ use rustc_errors::{codes::*, struct_span_code_err};
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_middle::query::Providers;
 use rustc_middle::ty::{self, TyCtxt, TypeVisitableExt};
+use rustc_session::parse::feature_err;
 use rustc_span::{sym, ErrorGuaranteed};
 use rustc_trait_selection::traits;
 
@@ -49,6 +50,19 @@ fn enforce_trait_manually_implementable(
 ) -> Result<(), ErrorGuaranteed> {
     let impl_header_span = tcx.def_span(impl_def_id);
 
+    if tcx.lang_items().freeze_trait() == Some(trait_def_id) {
+        if !tcx.features().freeze_impls {
+            feature_err(
+                &tcx.sess,
+                sym::freeze_impls,
+                impl_header_span,
+                "explicit impls for the `Freeze` trait are not permitted",
+            )
+            .with_span_label(impl_header_span, format!("impl of `Freeze` not allowed"))
+            .emit();
+        }
+    }
+
     // Disallow *all* explicit impls of traits marked `#[rustc_deny_explicit_impl]`
     if trait_def.deny_explicit_impl {
         let trait_name = tcx.item_name(trait_def_id);

compiler/rustc_span/src/symbol.rs

@@ -864,6 +864,7 @@ symbols! {
         format_placeholder,
         format_unsafe_arg,
         freeze,
+        freeze_impls,
         freg,
         frem_algebraic,
         frem_fast,

config.example.toml

@@ -842,6 +842,17 @@
 # See that option for more info.
 #codegen-backends = rust.codegen-backends (array)
 
+# This is a "runner" to pass to `compiletest` when executing tests. Tests will
+# execute this tool where the binary-to-test is passed as an argument. Can
+# be useful for situations such as when WebAssembly is being tested and a
+# runtime needs to be configured. This value is similar to
+# Cargo's `CARGO_$target_RUNNER` configuration.
+#
+# This configuration is a space-separated list of arguments so `foo bar` would
+# execute the program `foo` with the first argument as `bar` and the second
+# argument as the test binary.
+#runner = <none> (string)
+
 # =============================================================================
 # Distribution options
 #

library/alloc/src/raw_vec.rs

@@ -5,7 +5,6 @@ use core::cmp;
 use core::hint;
 use core::mem::{self, ManuallyDrop, MaybeUninit, SizedTypeProperties};
 use core::ptr::{self, NonNull, Unique};
-use core::slice;
 
 #[cfg(not(no_global_oom_handling))]
 use crate::alloc::handle_alloc_error;
@@ -192,7 +191,7 @@ impl<T, A: Allocator> RawVec<T, A> {
 
         let me = ManuallyDrop::new(self);
         unsafe {
-            let slice = slice::from_raw_parts_mut(me.ptr() as *mut MaybeUninit<T>, len);
+            let slice = ptr::slice_from_raw_parts_mut(me.ptr() as *mut MaybeUninit<T>, len);
             Box::from_raw_in(slice, ptr::read(&me.alloc))
         }
     }

library/alloc/src/slice.rs

@@ -33,8 +33,6 @@ use crate::vec::Vec;
 #[cfg(test)]
 mod tests;
 
-#[unstable(feature = "slice_range", issue = "76393")]
-pub use core::slice::range;
 #[unstable(feature = "array_chunks", issue = "74985")]
 pub use core::slice::ArrayChunks;
 #[unstable(feature = "array_chunks", issue = "74985")]
@@ -51,6 +49,8 @@ pub use core::slice::{from_mut, from_ref};
 pub use core::slice::{from_mut_ptr_range, from_ptr_range};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::slice::{from_raw_parts, from_raw_parts_mut};
+#[unstable(feature = "slice_range", issue = "76393")]
+pub use core::slice::{range, try_range};
 #[stable(feature = "slice_group_by", since = "1.77.0")]
 pub use core::slice::{ChunkBy, ChunkByMut};
 #[stable(feature = "rust1", since = "1.0.0")]

library/core/src/lib.rs

@@ -204,6 +204,7 @@
 // tidy-alphabetical-start
 #![cfg_attr(bootstrap, feature(diagnostic_namespace))]
 #![cfg_attr(bootstrap, feature(platform_intrinsics))]
+#![cfg_attr(not(bootstrap), feature(freeze_impls))]
 #![feature(abi_unadjusted)]
 #![feature(adt_const_params)]
 #![feature(allow_internal_unsafe)]

library/core/src/marker.rs

@@ -810,15 +810,21 @@ pub trait DiscriminantKind {
     type Discriminant: Clone + Copy + Debug + Eq + PartialEq + Hash + Send + Sync + Unpin;
 }
 
-/// Compiler-internal trait used to determine whether a type contains
+/// Used to determine whether a type contains
 /// any `UnsafeCell` internally, but not through an indirection.
 /// This affects, for example, whether a `static` of that type is
 /// placed in read-only static memory or writable static memory.
+/// This can be used to declare that a constant with a generic type
+/// will not contain interior mutability, and subsequently allow
+/// placing the constant behind references.
 #[lang = "freeze"]
-pub(crate) unsafe auto trait Freeze {}
+#[unstable(feature = "freeze", issue = "121675")]
+pub unsafe auto trait Freeze {}
 
+#[unstable(feature = "freeze", issue = "121675")]
 impl<T: ?Sized> !Freeze for UnsafeCell<T> {}
 marker_impls! {
+    #[unstable(feature = "freeze", issue = "121675")]
     unsafe Freeze for
         {T: ?Sized} PhantomData<T>,
         {T: ?Sized} *const T,

library/core/src/slice/index.rs

@@ -704,17 +704,15 @@ where
 {
     let len = bounds.end;
 
-    let start: ops::Bound<&usize> = range.start_bound();
-    let start = match start {
+    let start = match range.start_bound() {
         ops::Bound::Included(&start) => start,
         ops::Bound::Excluded(start) => {
             start.checked_add(1).unwrap_or_else(|| slice_start_index_overflow_fail())
         }
         ops::Bound::Unbounded => 0,
     };
 
-    let end: ops::Bound<&usize> = range.end_bound();
-    let end = match end {
+    let end = match range.end_bound() {
         ops::Bound::Included(end) => {
             end.checked_add(1).unwrap_or_else(|| slice_end_index_overflow_fail())
         }
@@ -732,6 +730,59 @@ where
     ops::Range { start, end }
 }
 
+/// Performs bounds-checking of a range without panicking.
+///
+/// This is a version of [`range`] that returns [`None`] instead of panicking.
+///
+/// # Examples
+///
+/// ```
+/// #![feature(slice_range)]
+///
+/// use std::slice;
+///
+/// let v = [10, 40, 30];
+/// assert_eq!(Some(1..2), slice::try_range(1..2, ..v.len()));
+/// assert_eq!(Some(0..2), slice::try_range(..2, ..v.len()));
+/// assert_eq!(Some(1..3), slice::try_range(1.., ..v.len()));
+/// ```
+///
+/// Returns [`None`] when [`Index::index`] would panic:
+///
+/// ```
+/// #![feature(slice_range)]
+///
+/// use std::slice;
+///
+/// assert_eq!(None, slice::try_range(2..1, ..3));
+/// assert_eq!(None, slice::try_range(1..4, ..3));
+/// assert_eq!(None, slice::try_range(1..=usize::MAX, ..3));
+/// ```
+///
+/// [`Index::index`]: ops::Index::index
+#[unstable(feature = "slice_range", issue = "76393")]
+#[must_use]
+pub fn try_range<R>(range: R, bounds: ops::RangeTo<usize>) -> Option<ops::Range<usize>>
+where
+    R: ops::RangeBounds<usize>,
+{
+    let len = bounds.end;
+
+    let start = match range.start_bound() {
+        ops::Bound::Included(&start) => start,
+        ops::Bound::Excluded(start) => start.checked_add(1)?,
+        ops::Bound::Unbounded => 0,
+    };
+
+    let end = match range.end_bound() {
+        ops::Bound::Included(end) => end.checked_add(1)?,
+        ops::Bound::Excluded(&end) => end,
+        ops::Bound::Unbounded => len,
+    };
+
+    if start > end || end > len { None } else { Some(ops::Range { start, end }) }
+}
+
 /// Convert pair of `ops::Bound`s into `ops::Range` without performing any bounds checking and (in debug) overflow checking
 pub(crate) fn into_range_unchecked(
     len: usize,

library/core/src/slice/mod.rs

@@ -91,7 +91,7 @@ pub use sort::heapsort;
 pub use index::SliceIndex;
 
 #[unstable(feature = "slice_range", issue = "76393")]
-pub use index::range;
+pub use index::{range, try_range};
 
 #[stable(feature = "inherent_ascii_escape", since = "1.60.0")]
 pub use ascii::EscapeAscii;

library/std/src/sys/pal/unix/thread.rs

@@ -806,9 +806,9 @@ pub mod guard {
     #[cfg(any(
         target_os = "android",
         target_os = "freebsd",
+        target_os = "netbsd",
         target_os = "hurd",
         target_os = "linux",
-        target_os = "netbsd",
         target_os = "l4re"
     ))]
     unsafe fn get_stack_start() -> Option<*mut libc::c_void> {
@@ -911,9 +911,10 @@ pub mod guard {
                         }
                     }) * page_size;
             Some(guard)
-        } else if cfg!(target_os = "openbsd") {
+        } else if cfg!(any(target_os = "openbsd", target_os = "netbsd")) {
             // OpenBSD stack already includes a guard page, and stack is
             // immutable.
+            // NetBSD stack includes the guard page.
             //
             // We'll just note where we expect rlimit to start
             // faulting, so our handler can report "stack overflow", and

library/std/src/sys/pal/windows/c.rs

@@ -344,6 +344,7 @@ compat_fn_with_fallback! {
 
     // >= Win8 / Server 2012
     // https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getsystemtimepreciseasfiletime
+    #[cfg(target_vendor = "win7")]
     pub fn GetSystemTimePreciseAsFileTime(lpsystemtimeasfiletime: *mut FILETIME) -> () {
         GetSystemTimeAsFileTime(lpsystemtimeasfiletime)
     }

library/std/src/sys/pal/windows/c/bindings.txt

@@ -2476,6 +2476,7 @@ Windows.Win32.System.Pipes.PIPE_WAIT
 Windows.Win32.System.SystemInformation.GetSystemDirectoryW
 Windows.Win32.System.SystemInformation.GetSystemInfo
 Windows.Win32.System.SystemInformation.GetSystemTimeAsFileTime
+Windows.Win32.System.SystemInformation.GetSystemTimePreciseAsFileTime
 Windows.Win32.System.SystemInformation.GetWindowsDirectoryW
 Windows.Win32.System.SystemInformation.PROCESSOR_ARCHITECTURE
 Windows.Win32.System.SystemInformation.SYSTEM_INFO

library/std/src/sys/pal/windows/c/windows_sys.rs

@@ -345,6 +345,10 @@ extern "system" {
     pub fn GetSystemTimeAsFileTime(lpsystemtimeasfiletime: *mut FILETIME) -> ();
 }
 #[link(name = "kernel32")]
+extern "system" {
+    pub fn GetSystemTimePreciseAsFileTime(lpsystemtimeasfiletime: *mut FILETIME) -> ();
+}
+#[link(name = "kernel32")]
 extern "system" {
     pub fn GetTempPathW(nbufferlength: u32, lpbuffer: PWSTR) -> u32;
 }

src/bootstrap/src/core/build_steps/test.rs

@@ -1971,6 +1971,8 @@ NOTE: if you're sure you want to do this, please open an issue as to why. In the
 
         if builder.remote_tested(target) {
             cmd.arg("--remote-test-client").arg(builder.tool_exe(Tool::RemoteTestClient));
+        } else if let Some(tool) = builder.runner(target) {
+            cmd.arg("--runner").arg(tool);
         }
 
         if suite != "mir-opt" {
@@ -2523,6 +2525,8 @@ fn prepare_cargo_test(
             format!("CARGO_TARGET_{}_RUNNER", envify(&target.triple)),
             format!("{} run 0", builder.tool_exe(Tool::RemoteTestClient).display()),
         );
+    } else if let Some(tool) = builder.runner(target) {
+        cargo.env(format!("CARGO_TARGET_{}_RUNNER", envify(&target.triple)), tool);
     }
 
     cargo

src/bootstrap/src/core/config/config.rs

@@ -581,6 +581,7 @@ pub struct Target {
     pub musl_libdir: Option<PathBuf>,
     pub wasi_root: Option<PathBuf>,
     pub qemu_rootfs: Option<PathBuf>,
+    pub runner: Option<String>,
     pub no_std: bool,
     pub codegen_backends: Option<Vec<String>>,
 }
@@ -1144,6 +1145,7 @@ define_config! {
         qemu_rootfs: Option<String> = "qemu-rootfs",
         no_std: Option<bool> = "no-std",
         codegen_backends: Option<Vec<String>> = "codegen-backends",
+        runner: Option<String> = "runner",
     }
 }
 
@@ -1864,6 +1866,7 @@ impl Config {
                 target.musl_libdir = cfg.musl_libdir.map(PathBuf::from);
                 target.wasi_root = cfg.wasi_root.map(PathBuf::from);
                 target.qemu_rootfs = cfg.qemu_rootfs.map(PathBuf::from);
+                target.runner = cfg.runner;
                 target.sanitizers = cfg.sanitizers;
                 target.profiler = cfg.profiler;
                 target.rpath = cfg.rpath;

src/bootstrap/src/core/sanity.rs

@@ -15,6 +15,7 @@ use std::fs;
 use std::path::PathBuf;
 use std::process::Command;
 
+use crate::builder::Kind;
 use crate::core::config::Target;
 use crate::utils::helpers::output;
 use crate::Build;
@@ -64,6 +65,8 @@ pub fn check(build: &mut Build) {
     let mut skip_target_sanity =
         env::var_os("BOOTSTRAP_SKIP_TARGET_SANITY").is_some_and(|s| s == "1" || s == "true");
 
+    skip_target_sanity |= build.config.cmd.kind() == Kind::Check;
+
     // Skip target sanity checks when we are doing anything with mir-opt tests or Miri
     let skipped_paths = [OsStr::new("mir-opt"), OsStr::new("miri")];
     skip_target_sanity |= build.config.paths.iter().any(|path| {
@@ -169,11 +172,8 @@ than building it.
             continue;
         }
 
-        // Some environments don't want or need these tools, such as when testing Miri.
-        // FIXME: it would be better to refactor this code to split necessary setup from pure sanity
-        // checks, and have a regular flag for skipping the latter. Also see
-        // <https://github.com/rust-lang/rust/pull/103569#discussion_r1008741742>.
-        if skip_target_sanity {
+        // skip check for cross-targets
+        if skip_target_sanity && target != &build.build {
             continue;
         }
 
@@ -215,11 +215,8 @@ than building it.
             panic!("All the *-none-* and nvptx* targets are no-std targets")
         }
 
-        // Some environments don't want or need these tools, such as when testing Miri.
-        // FIXME: it would be better to refactor this code to split necessary setup from pure sanity
-        // checks, and have a regular flag for skipping the latter. Also see
-        // <https://github.com/rust-lang/rust/pull/103569#discussion_r1008741742>.
-        if skip_target_sanity {
+        // skip check for cross-targets
+        if skip_target_sanity && target != &build.build {
             continue;
         }
 

src/bootstrap/src/lib.rs

@@ -1354,6 +1354,17 @@ impl Build {
             || env::var_os("TEST_DEVICE_ADDR").is_some()
     }
 
+    /// Returns an optional "runner" to pass to `compiletest` when executing
+    /// test binaries.
+    ///
+    /// An example of this would be a WebAssembly runtime when testing the wasm
+    /// targets.
+    fn runner(&self, target: TargetSelection) -> Option<String> {
+        let target = self.config.target_config.get(&target)?;
+        let runner = target.runner.as_ref()?;
+        Some(runner.to_owned())
+    }
+
     /// Returns the root of the "rootfs" image that this target will be using,
     /// if one was configured.
     ///

src/bootstrap/src/utils/change_tracker.rs

@@ -141,4 +141,9 @@ pub const CONFIG_CHANGE_HISTORY: &[ChangeInfo] = &[
         severity: ChangeSeverity::Info,
         summary: "A new `boostrap-cache-path` option has been introduced which can be utilized to modify the cache path for bootstrap.",
     },
+    ChangeInfo {
+        change_id: 122108,
+        severity: ChangeSeverity::Info,
+        summary: "a new `target.*.runner` option is available to specify a wrapper executable required to run tests for a target",
+    },
 ];