Rollup of 4 pull requests

compiler/rustc_feature/src/accepted.rs

@@ -157,9 +157,6 @@ declare_features! (
     (accepted, const_refs_to_static, "1.83.0", Some(119618)),
     /// Allows implementing `Copy` for closures where possible (RFC 2132).
     (accepted, copy_closures, "1.26.0", Some(44490)),
-    /// Allows function attribute `#[coverage(on/off)]`, to control coverage
-    /// instrumentation of that function.
-    (accepted, coverage_attribute, "CURRENT_RUSTC_VERSION", Some(84605)),
     /// Allows `crate` in paths.
     (accepted, crate_in_paths, "1.30.0", Some(45477)),
     /// Allows users to provide classes for fenced code block using `class:classname`.

compiler/rustc_feature/src/builtin_attrs.rs

@@ -480,9 +480,10 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
         template!(List: "address, kcfi, memory, thread"), DuplicatesOk,
         EncodeCrossCrate::No, experimental!(no_sanitize)
     ),
-    ungated!(
+    gated!(
         coverage, Normal, template!(OneOf: &[sym::off, sym::on]),
         ErrorPreceding, EncodeCrossCrate::No,
+        coverage_attribute, experimental!(coverage)
     ),
 
     ungated!(

compiler/rustc_feature/src/unstable.rs

@@ -447,6 +447,9 @@ declare_features! (
     (unstable, coroutine_clone, "1.65.0", Some(95360)),
     /// Allows defining coroutines.
     (unstable, coroutines, "1.21.0", Some(43122)),
+    /// Allows function attribute `#[coverage(on/off)]`, to control coverage
+    /// instrumentation of that function.
+    (unstable, coverage_attribute, "1.74.0", Some(84605)),
     /// Allows non-builtin attributes in inner attribute position.
     (unstable, custom_inner_attributes, "1.30.0", Some(54726)),
     /// Allows custom test frameworks with `#![test_runner]` and `#[test_case]`.

library/core/src/cmp.rs

@@ -348,7 +348,7 @@ pub trait Eq: PartialEq<Self> {
 #[rustc_builtin_macro]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
 #[allow_internal_unstable(core_intrinsics, derive_eq, structural_match)]
-#[cfg_attr(bootstrap, allow_internal_unstable(coverage_attribute))]
+#[allow_internal_unstable(coverage_attribute)]
 pub macro Eq($item:item) {
     /* compiler built-in */
 }

library/core/src/lib.rs

@@ -107,13 +107,13 @@
 //
 // Library features:
 // tidy-alphabetical-start
-#![cfg_attr(bootstrap, feature(coverage_attribute))]
 #![cfg_attr(bootstrap, feature(do_not_recommend))]
 #![feature(array_ptr_get)]
 #![feature(asm_experimental_arch)]
 #![feature(const_eval_select)]
 #![feature(const_typed_swap)]
 #![feature(core_intrinsics)]
+#![feature(coverage_attribute)]
 #![feature(internal_impls_macro)]
 #![feature(ip)]
 #![feature(is_ascii_octdigit)]

library/core/src/macros/mod.rs

@@ -1673,8 +1673,7 @@ pub(crate) mod builtin {
     ///
     /// [the reference]: ../../../reference/attributes/testing.html#the-test-attribute
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[allow_internal_unstable(test, rustc_attrs)]
-    #[cfg_attr(bootstrap, allow_internal_unstable(coverage_attribute))]
+    #[allow_internal_unstable(test, rustc_attrs, coverage_attribute)]
     #[rustc_builtin_macro]
     pub macro test($item:item) {
         /* compiler built-in */
@@ -1687,8 +1686,7 @@ pub(crate) mod builtin {
         soft,
         reason = "`bench` is a part of custom test frameworks which are unstable"
     )]
-    #[allow_internal_unstable(test, rustc_attrs)]
-    #[cfg_attr(bootstrap, allow_internal_unstable(coverage_attribute))]
+    #[allow_internal_unstable(test, rustc_attrs, coverage_attribute)]
     #[rustc_builtin_macro]
     pub macro bench($item:item) {
         /* compiler built-in */

src/build_helper/src/fs/mod.rs

@@ -0,0 +1,69 @@
+//! Misc filesystem related helpers for use by bootstrap and tools.
+use std::fs::Metadata;
+use std::path::Path;
+use std::{fs, io};
+
+#[cfg(test)]
+mod tests;
+
+/// Helper to ignore [`std::io::ErrorKind::NotFound`], but still propagate other
+/// [`std::io::ErrorKind`]s.
+pub fn ignore_not_found<Op>(mut op: Op) -> io::Result<()>
+where
+    Op: FnMut() -> io::Result<()>,
+{
+    match op() {
+        Ok(()) => Ok(()),
+        Err(e) if e.kind() == io::ErrorKind::NotFound => Ok(()),
+        Err(e) => Err(e),
+    }
+}
+
+/// A wrapper around [`std::fs::remove_dir_all`] that can also be used on *non-directory entries*,
+/// including files and symbolic links.
+///
+/// - This will produce an error if the target path is not found.
+/// - Like [`std::fs::remove_dir_all`], this helper does not traverse symbolic links, will remove
+///   symbolic link itself.
+/// - This helper is **not** robust against races on the underlying filesystem, behavior is
+///   unspecified if this helper is called concurrently.
+/// - This helper is not robust against TOCTOU problems.
+///
+/// FIXME: this implementation is insufficiently robust to replace bootstrap's clean `rm_rf`
+/// implementation:
+///
+/// - This implementation currently does not perform retries.
+#[track_caller]
+pub fn recursive_remove<P: AsRef<Path>>(path: P) -> io::Result<()> {
+    let path = path.as_ref();
+    let metadata = fs::symlink_metadata(path)?;
+    #[cfg(windows)]
+    let is_dir_like = |meta: &fs::Metadata| {
+        use std::os::windows::fs::FileTypeExt;
+        meta.is_dir() || meta.file_type().is_symlink_dir()
+    };
+    #[cfg(not(windows))]
+    let is_dir_like = fs::Metadata::is_dir;
+
+    if is_dir_like(&metadata) {
+        fs::remove_dir_all(path)
+    } else {
+        try_remove_op_set_perms(fs::remove_file, path, metadata)
+    }
+}
+
+fn try_remove_op_set_perms<'p, Op>(mut op: Op, path: &'p Path, metadata: Metadata) -> io::Result<()>
+where
+    Op: FnMut(&'p Path) -> io::Result<()>,
+{
+    match op(path) {
+        Ok(()) => Ok(()),
+        Err(e) if e.kind() == io::ErrorKind::PermissionDenied => {
+            let mut perms = metadata.permissions();
+            perms.set_readonly(false);
+            fs::set_permissions(path, perms)?;
+            op(path)
+        }
+        Err(e) => Err(e),
+    }
+}

src/build_helper/src/fs/tests.rs

@@ -0,0 +1,214 @@
+#![deny(unused_must_use)]
+
+use std::{env, fs, io};
+
+use super::recursive_remove;
+
+mod recursive_remove_tests {
+    use super::*;
+
+    // Basic cases
+
+    #[test]
+    fn nonexistent_path() {
+        let tmpdir = env::temp_dir();
+        let path = tmpdir.join("__INTERNAL_BOOTSTRAP_nonexistent_path");
+        assert!(fs::symlink_metadata(&path).is_err_and(|e| e.kind() == io::ErrorKind::NotFound));
+        assert!(recursive_remove(&path).is_err_and(|e| e.kind() == io::ErrorKind::NotFound));
+    }
+
+    #[test]
+    fn file() {
+        let tmpdir = env::temp_dir();
+        let path = tmpdir.join("__INTERNAL_BOOTSTRAP_file");
+        fs::write(&path, b"").unwrap();
+        assert!(fs::symlink_metadata(&path).is_ok());
+        assert!(recursive_remove(&path).is_ok());
+        assert!(fs::symlink_metadata(&path).is_err_and(|e| e.kind() == io::ErrorKind::NotFound));
+    }
+
+    mod dir_tests {
+        use super::*;
+
+        #[test]
+        fn dir_empty() {
+            let tmpdir = env::temp_dir();
+            let path = tmpdir.join("__INTERNAL_BOOTSTRAP_dir_tests_dir_empty");
+            fs::create_dir_all(&path).unwrap();
+            assert!(fs::symlink_metadata(&path).is_ok());
+            assert!(recursive_remove(&path).is_ok());
+            assert!(
+                fs::symlink_metadata(&path).is_err_and(|e| e.kind() == io::ErrorKind::NotFound)
+            );
+        }
+
+        #[test]
+        fn dir_recursive() {
+            let tmpdir = env::temp_dir();
+            let path = tmpdir.join("__INTERNAL_BOOTSTRAP_dir_tests_dir_recursive");
+            fs::create_dir_all(&path).unwrap();
+            assert!(fs::symlink_metadata(&path).is_ok());
+
+            let file_a = path.join("a.txt");
+            fs::write(&file_a, b"").unwrap();
+            assert!(fs::symlink_metadata(&file_a).is_ok());
+
+            let dir_b = path.join("b");
+            fs::create_dir_all(&dir_b).unwrap();
+            assert!(fs::symlink_metadata(&dir_b).is_ok());
+
+            let file_c = dir_b.join("c.rs");
+            fs::write(&file_c, b"").unwrap();
+            assert!(fs::symlink_metadata(&file_c).is_ok());
+
+            assert!(recursive_remove(&path).is_ok());
+
+            assert!(
+                fs::symlink_metadata(&file_a).is_err_and(|e| e.kind() == io::ErrorKind::NotFound)
+            );
+            assert!(
+                fs::symlink_metadata(&dir_b).is_err_and(|e| e.kind() == io::ErrorKind::NotFound)
+            );
+            assert!(
+                fs::symlink_metadata(&file_c).is_err_and(|e| e.kind() == io::ErrorKind::NotFound)
+            );
+        }
+    }
+
+    /// Check that [`recursive_remove`] does not traverse symlinks and only removes symlinks
+    /// themselves.
+    ///
+    /// Symlink-to-file versus symlink-to-dir is a distinction that's important on Windows, but not
+    /// on Unix.
+    mod symlink_tests {
+        use super::*;
+
+        #[cfg(unix)]
+        #[test]
+        fn unix_symlink() {
+            let tmpdir = env::temp_dir();
+            let path = tmpdir.join("__INTERNAL_BOOTSTRAP_symlink_tests_unix_symlink");
+            let symlink_path =
+                tmpdir.join("__INTERNAL_BOOTSTRAP__symlink_tests_unix_symlink_symlink");
+            fs::write(&path, b"").unwrap();
+
+            assert!(fs::symlink_metadata(&path).is_ok());
+            assert!(
+                fs::symlink_metadata(&symlink_path)
+                    .is_err_and(|e| e.kind() == io::ErrorKind::NotFound)
+            );
+
+            std::os::unix::fs::symlink(&path, &symlink_path).unwrap();
+
+            assert!(recursive_remove(&symlink_path).is_ok());
+
+            // Check that the symlink got removed...
+            assert!(
+                fs::symlink_metadata(&symlink_path)
+                    .is_err_and(|e| e.kind() == io::ErrorKind::NotFound)
+            );
+            // ... but pointed-to file still exists.
+            assert!(fs::symlink_metadata(&path).is_ok());
+
+            fs::remove_file(&path).unwrap();
+        }
+
+        #[cfg(windows)]
+        #[test]
+        fn windows_symlink_to_file() {
+            let tmpdir = env::temp_dir();
+            let path = tmpdir.join("__INTERNAL_BOOTSTRAP_symlink_tests_windows_symlink_to_file");
+            let symlink_path = tmpdir
+                .join("__INTERNAL_BOOTSTRAP_SYMLINK_symlink_tests_windows_symlink_to_file_symlink");
+            fs::write(&path, b"").unwrap();
+
+            assert!(fs::symlink_metadata(&path).is_ok());
+            assert!(
+                fs::symlink_metadata(&symlink_path)
+                    .is_err_and(|e| e.kind() == io::ErrorKind::NotFound)
+            );
+
+            std::os::windows::fs::symlink_file(&path, &symlink_path).unwrap();
+
+            assert!(recursive_remove(&symlink_path).is_ok());
+
+            // Check that the symlink-to-file got removed...
+            assert!(
+                fs::symlink_metadata(&symlink_path)
+                    .is_err_and(|e| e.kind() == io::ErrorKind::NotFound)
+            );
+            // ... but pointed-to file still exists.
+            assert!(fs::symlink_metadata(&path).is_ok());
+
+            fs::remove_file(&path).unwrap();
+        }
+
+        #[cfg(windows)]
+        #[test]
+        fn windows_symlink_to_dir() {
+            let tmpdir = env::temp_dir();
+            let path = tmpdir.join("__INTERNAL_BOOTSTRAP_symlink_tests_windows_symlink_to_dir");
+            let symlink_path =
+                tmpdir.join("__INTERNAL_BOOTSTRAP_symlink_tests_windows_symlink_to_dir_symlink");
+            fs::create_dir_all(&path).unwrap();
+
+            assert!(fs::symlink_metadata(&path).is_ok());
+            assert!(
+                fs::symlink_metadata(&symlink_path)
+                    .is_err_and(|e| e.kind() == io::ErrorKind::NotFound)
+            );
+
+            std::os::windows::fs::symlink_dir(&path, &symlink_path).unwrap();
+
+            assert!(recursive_remove(&symlink_path).is_ok());
+
+            // Check that the symlink-to-dir got removed...
+            assert!(
+                fs::symlink_metadata(&symlink_path)
+                    .is_err_and(|e| e.kind() == io::ErrorKind::NotFound)
+            );
+            // ... but pointed-to dir still exists.
+            assert!(fs::symlink_metadata(&path).is_ok());
+
+            fs::remove_dir_all(&path).unwrap();
+        }
+    }
+
+    /// Read-only file and directories only need special handling on Windows.
+    #[cfg(windows)]
+    mod readonly_tests {
+        use super::*;
+
+        #[test]
+        fn overrides_readonly() {
+            let tmpdir = env::temp_dir();
+            let path = tmpdir.join("__INTERNAL_BOOTSTRAP_readonly_tests_overrides_readonly");
+
+            // In case of a previous failed test:
+            if let Ok(mut perms) = fs::symlink_metadata(&path).map(|m| m.permissions()) {
+                perms.set_readonly(false);
+                fs::set_permissions(&path, perms).unwrap();
+                fs::remove_file(&path).unwrap();
+            }
+
+            fs::write(&path, b"").unwrap();
+
+            let mut perms = fs::symlink_metadata(&path).unwrap().permissions();
+            perms.set_readonly(true);
+            fs::set_permissions(&path, perms).unwrap();
+
+            // Check that file exists but is read-only, and that normal `std::fs::remove_file` fails
+            // to delete the file.
+            assert!(fs::symlink_metadata(&path).is_ok_and(|m| m.permissions().readonly()));
+            assert!(
+                fs::remove_file(&path).is_err_and(|e| e.kind() == io::ErrorKind::PermissionDenied)
+            );
+
+            assert!(recursive_remove(&path).is_ok());
+
+            assert!(
+                fs::symlink_metadata(&path).is_err_and(|e| e.kind() == io::ErrorKind::NotFound)
+            );
+        }
+    }
+}

src/build_helper/src/lib.rs

@@ -2,6 +2,7 @@
 
 pub mod ci;
 pub mod drop_bomb;
+pub mod fs;
 pub mod git;
 pub mod metrics;
 pub mod stage0_parser;

src/doc/rustc/src/SUMMARY.md

@@ -81,6 +81,7 @@
     - [\*-nto-qnx-\*](platform-support/nto-qnx.md)
     - [*-unikraft-linux-musl](platform-support/unikraft-linux-musl.md)
     - [*-unknown-hermit](platform-support/hermit.md)
+    - [*-unknown-freebsd](platform-support/freebsd.md)
     - [\*-unknown-netbsd\*](platform-support/netbsd.md)
     - [*-unknown-openbsd](platform-support/openbsd.md)
     - [*-unknown-redox](platform-support/redox.md)