Auto merge of rust-lang#125020 - GuillaumeGomez:rollup-3vxwqef, r=GuillaumeGomez

Rollup of 6 pull requests

Successful merges:

 - rust-lang#124807 (Migrate `run-make/rustdoc-io-error` to `rmake.rs`)
 - rust-lang#124829 (Enable profiler for armv7-unknown-linux-gnueabihf.)
 - rust-lang#124939 (Always hide private fields in aliased type)
 - rust-lang#124963 (Migrate `run-make/rustdoc-shared-flags` to rmake)
 - rust-lang#124981 (Relax allocator requirements on some Rc/Arc APIs.)
 - rust-lang#125008 (Add test for rust-lang#122775)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

library/alloc/src/rc.rs

@@ -365,6 +365,12 @@ impl<T: ?Sized, A: Allocator> Rc<T, A> {
         unsafe { self.ptr.as_ref() }
     }
 
+    #[inline]
+    fn into_inner_with_allocator(this: Self) -> (NonNull<RcBox<T>>, A) {
+        let this = mem::ManuallyDrop::new(this);
+        (this.ptr, unsafe { ptr::read(&this.alloc) })
+    }
+
     #[inline]
     unsafe fn from_inner_in(ptr: NonNull<RcBox<T>>, alloc: A) -> Self {
         Self { ptr, phantom: PhantomData, alloc }
@@ -1145,12 +1151,9 @@ impl<T, A: Allocator> Rc<mem::MaybeUninit<T>, A> {
     /// ```
     #[unstable(feature = "new_uninit", issue = "63291")]
     #[inline]
-    pub unsafe fn assume_init(self) -> Rc<T, A>
-    where
-        A: Clone,
-    {
-        let md_self = mem::ManuallyDrop::new(self);
-        unsafe { Rc::from_inner_in(md_self.ptr.cast(), md_self.alloc.clone()) }
+    pub unsafe fn assume_init(self) -> Rc<T, A> {
+        let (ptr, alloc) = Rc::into_inner_with_allocator(self);
+        unsafe { Rc::from_inner_in(ptr.cast(), alloc) }
     }
 }
 
@@ -1189,12 +1192,9 @@ impl<T, A: Allocator> Rc<[mem::MaybeUninit<T>], A> {
     /// ```
     #[unstable(feature = "new_uninit", issue = "63291")]
     #[inline]
-    pub unsafe fn assume_init(self) -> Rc<[T], A>
-    where
-        A: Clone,
-    {
-        let md_self = mem::ManuallyDrop::new(self);
-        unsafe { Rc::from_ptr_in(md_self.ptr.as_ptr() as _, md_self.alloc.clone()) }
+    pub unsafe fn assume_init(self) -> Rc<[T], A> {
+        let (ptr, alloc) = Rc::into_inner_with_allocator(self);
+        unsafe { Rc::from_ptr_in(ptr.as_ptr() as _, alloc) }
     }
 }
 
@@ -1809,7 +1809,9 @@ impl<T: Clone, A: Allocator + Clone> Rc<T, A> {
         // reference to the allocation.
         unsafe { &mut this.ptr.as_mut().value }
     }
+}
 
+impl<T: Clone, A: Allocator> Rc<T, A> {
     /// If we have the only reference to `T` then unwrap it. Otherwise, clone `T` and return the
     /// clone.
     ///
@@ -1845,7 +1847,7 @@ impl<T: Clone, A: Allocator + Clone> Rc<T, A> {
     }
 }
 
-impl<A: Allocator + Clone> Rc<dyn Any, A> {
+impl<A: Allocator> Rc<dyn Any, A> {
     /// Attempt to downcast the `Rc<dyn Any>` to a concrete type.
     ///
     /// # Examples
@@ -1869,10 +1871,8 @@ impl<A: Allocator + Clone> Rc<dyn Any, A> {
     pub fn downcast<T: Any>(self) -> Result<Rc<T, A>, Self> {
         if (*self).is::<T>() {
             unsafe {
-                let ptr = self.ptr.cast::<RcBox<T>>();
-                let alloc = self.alloc.clone();
-                forget(self);
-                Ok(Rc::from_inner_in(ptr, alloc))
+                let (ptr, alloc) = Rc::into_inner_with_allocator(self);
+                Ok(Rc::from_inner_in(ptr.cast(), alloc))
             }
         } else {
             Err(self)
@@ -1909,10 +1909,8 @@ impl<A: Allocator + Clone> Rc<dyn Any, A> {
     #[unstable(feature = "downcast_unchecked", issue = "90850")]
     pub unsafe fn downcast_unchecked<T: Any>(self) -> Rc<T, A> {
         unsafe {
-            let ptr = self.ptr.cast::<RcBox<T>>();
-            let alloc = self.alloc.clone();
-            mem::forget(self);
-            Rc::from_inner_in(ptr, alloc)
+            let (ptr, alloc) = Rc::into_inner_with_allocator(self);
+            Rc::from_inner_in(ptr.cast(), alloc)
         }
     }
 }
@@ -2661,12 +2659,13 @@ impl From<Rc<str>> for Rc<[u8]> {
 }
 
 #[stable(feature = "boxed_slice_try_from", since = "1.43.0")]
-impl<T, const N: usize> TryFrom<Rc<[T]>> for Rc<[T; N]> {
-    type Error = Rc<[T]>;
+impl<T, A: Allocator, const N: usize> TryFrom<Rc<[T], A>> for Rc<[T; N], A> {
+    type Error = Rc<[T], A>;
 
-    fn try_from(boxed_slice: Rc<[T]>) -> Result<Self, Self::Error> {
+    fn try_from(boxed_slice: Rc<[T], A>) -> Result<Self, Self::Error> {
         if boxed_slice.len() == N {
-            Ok(unsafe { Rc::from_raw(Rc::into_raw(boxed_slice) as *mut [T; N]) })
+            let (ptr, alloc) = Rc::into_inner_with_allocator(boxed_slice);
+            Ok(unsafe { Rc::from_inner_in(ptr.cast(), alloc) })
         } else {
             Err(boxed_slice)
         }

library/alloc/src/sync.rs

@@ -280,8 +280,8 @@ impl<T: ?Sized> Arc<T> {
 
 impl<T: ?Sized, A: Allocator> Arc<T, A> {
     #[inline]
-    fn internal_into_inner_with_allocator(self) -> (NonNull<ArcInner<T>>, A) {
-        let this = mem::ManuallyDrop::new(self);
+    fn into_inner_with_allocator(this: Self) -> (NonNull<ArcInner<T>>, A) {
+        let this = mem::ManuallyDrop::new(this);
         (this.ptr, unsafe { ptr::read(&this.alloc) })
     }
 
@@ -1290,7 +1290,7 @@ impl<T, A: Allocator> Arc<mem::MaybeUninit<T>, A> {
     #[must_use = "`self` will be dropped if the result is not used"]
     #[inline]
     pub unsafe fn assume_init(self) -> Arc<T, A> {
-        let (ptr, alloc) = self.internal_into_inner_with_allocator();
+        let (ptr, alloc) = Arc::into_inner_with_allocator(self);
         unsafe { Arc::from_inner_in(ptr.cast(), alloc) }
     }
 }
@@ -1332,7 +1332,7 @@ impl<T, A: Allocator> Arc<[mem::MaybeUninit<T>], A> {
     #[must_use = "`self` will be dropped if the result is not used"]
     #[inline]
     pub unsafe fn assume_init(self) -> Arc<[T], A> {
-        let (ptr, alloc) = self.internal_into_inner_with_allocator();
+        let (ptr, alloc) = Arc::into_inner_with_allocator(self);
         unsafe { Arc::from_ptr_in(ptr.as_ptr() as _, alloc) }
     }
 }
@@ -2227,7 +2227,9 @@ impl<T: Clone, A: Allocator + Clone> Arc<T, A> {
         // either unique to begin with, or became one upon cloning the contents.
         unsafe { Self::get_mut_unchecked(this) }
     }
+}
 
+impl<T: Clone, A: Allocator> Arc<T, A> {
     /// If we have the only reference to `T` then unwrap it. Otherwise, clone `T` and return the
     /// clone.
     ///
@@ -2499,7 +2501,7 @@ impl<A: Allocator> Arc<dyn Any + Send + Sync, A> {
     {
         if (*self).is::<T>() {
             unsafe {
-                let (ptr, alloc) = self.internal_into_inner_with_allocator();
+                let (ptr, alloc) = Arc::into_inner_with_allocator(self);
                 Ok(Arc::from_inner_in(ptr.cast(), alloc))
             }
         } else {
@@ -2540,7 +2542,7 @@ impl<A: Allocator> Arc<dyn Any + Send + Sync, A> {
         T: Any + Send + Sync,
     {
         unsafe {
-            let (ptr, alloc) = self.internal_into_inner_with_allocator();
+            let (ptr, alloc) = Arc::into_inner_with_allocator(self);
             Arc::from_inner_in(ptr.cast(), alloc)
         }
     }
@@ -3506,7 +3508,7 @@ impl<T, A: Allocator, const N: usize> TryFrom<Arc<[T], A>> for Arc<[T; N], A> {
 
     fn try_from(boxed_slice: Arc<[T], A>) -> Result<Self, Self::Error> {
         if boxed_slice.len() == N {
-            let (ptr, alloc) = boxed_slice.internal_into_inner_with_allocator();
+            let (ptr, alloc) = Arc::into_inner_with_allocator(boxed_slice);
             Ok(unsafe { Arc::from_inner_in(ptr.cast(), alloc) })
         } else {
             Err(boxed_slice)

src/ci/docker/host-x86_64/dist-armv7-linux/Dockerfile

@@ -25,5 +25,5 @@ ENV CC_armv7_unknown_linux_gnueabihf=armv7-unknown-linux-gnueabihf-gcc \
 
 ENV HOSTS=armv7-unknown-linux-gnueabihf
 
-ENV RUST_CONFIGURE_ARGS --enable-full-tools --disable-docs
+ENV RUST_CONFIGURE_ARGS --enable-full-tools --enable-profiler --disable-docs
 ENV SCRIPT python3 ../x.py dist --host $HOSTS --target $HOSTS

src/librustdoc/passes/mod.rs

@@ -8,6 +8,9 @@ use crate::core::DocContext;
 mod stripper;
 pub(crate) use stripper::*;
 
+mod strip_aliased_non_local;
+pub(crate) use self::strip_aliased_non_local::STRIP_ALIASED_NON_LOCAL;
+
 mod strip_hidden;
 pub(crate) use self::strip_hidden::STRIP_HIDDEN;
 
@@ -71,6 +74,7 @@ pub(crate) enum Condition {
 pub(crate) const PASSES: &[Pass] = &[
     CHECK_CUSTOM_CODE_CLASSES,
     CHECK_DOC_TEST_VISIBILITY,
+    STRIP_ALIASED_NON_LOCAL,
     STRIP_HIDDEN,
     STRIP_PRIVATE,
     STRIP_PRIV_IMPORTS,
@@ -86,6 +90,7 @@ pub(crate) const DEFAULT_PASSES: &[ConditionalPass] = &[
     ConditionalPass::always(CHECK_CUSTOM_CODE_CLASSES),
     ConditionalPass::always(COLLECT_TRAIT_IMPLS),
     ConditionalPass::always(CHECK_DOC_TEST_VISIBILITY),
+    ConditionalPass::always(STRIP_ALIASED_NON_LOCAL),
     ConditionalPass::new(STRIP_HIDDEN, WhenNotDocumentHidden),
     ConditionalPass::new(STRIP_PRIVATE, WhenNotDocumentPrivate),
     ConditionalPass::new(STRIP_PRIV_IMPORTS, WhenDocumentPrivate),

src/librustdoc/passes/strip_aliased_non_local.rs

@@ -0,0 +1,57 @@
+use rustc_middle::ty::TyCtxt;
+use rustc_middle::ty::Visibility;
+
+use crate::clean;
+use crate::clean::Item;
+use crate::core::DocContext;
+use crate::fold::{strip_item, DocFolder};
+use crate::passes::Pass;
+
+pub(crate) const STRIP_ALIASED_NON_LOCAL: Pass = Pass {
+    name: "strip-aliased-non-local",
+    run: strip_aliased_non_local,
+    description: "strips all non-local private aliased items from the output",
+};
+
+fn strip_aliased_non_local(krate: clean::Crate, cx: &mut DocContext<'_>) -> clean::Crate {
+    let mut stripper = AliasedNonLocalStripper { tcx: cx.tcx };
+    stripper.fold_crate(krate)
+}
+
+struct AliasedNonLocalStripper<'tcx> {
+    tcx: TyCtxt<'tcx>,
+}
+
+impl<'tcx> DocFolder for AliasedNonLocalStripper<'tcx> {
+    fn fold_item(&mut self, i: Item) -> Option<Item> {
+        Some(match *i.kind {
+            clean::TypeAliasItem(..) => {
+                let mut stripper = NonLocalStripper { tcx: self.tcx };
+                // don't call `fold_item` as that could strip the type-alias it-self
+                // which we don't want to strip out
+                stripper.fold_item_recur(i)
+            }
+            _ => self.fold_item_recur(i),
+        })
+    }
+}
+
+struct NonLocalStripper<'tcx> {
+    tcx: TyCtxt<'tcx>,
+}
+
+impl<'tcx> DocFolder for NonLocalStripper<'tcx> {
+    fn fold_item(&mut self, i: Item) -> Option<Item> {
+        // If not local, we want to respect the original visibility of
+        // the field and not the one given by the user for the currrent crate.
+        //
+        // FIXME(#125009): Not-local should probably consider same Cargo workspace
+        if !i.def_id().map_or(true, |did| did.is_local()) {
+            if i.visibility(self.tcx) != Some(Visibility::Public) || i.is_doc_hidden() {
+                return Some(strip_item(i));
+            }
+        }
+
+        Some(self.fold_item_recur(i))
+    }
+}

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -244,15 +244,13 @@ run-make/rlib-format-packed-bundled-libs-3/Makefile
 run-make/rlib-format-packed-bundled-libs/Makefile
 run-make/rmeta-preferred/Makefile
 run-make/rustc-macro-dep-files/Makefile
-run-make/rustdoc-io-error/Makefile
 run-make/rustdoc-scrape-examples-invalid-expr/Makefile
 run-make/rustdoc-scrape-examples-macros/Makefile
 run-make/rustdoc-scrape-examples-multiple/Makefile
 run-make/rustdoc-scrape-examples-ordering/Makefile
 run-make/rustdoc-scrape-examples-remap/Makefile
 run-make/rustdoc-scrape-examples-test/Makefile
 run-make/rustdoc-scrape-examples-whitespace/Makefile
-run-make/rustdoc-shared-flags/Makefile
 run-make/rustdoc-target-spec-json-path/Makefile
 run-make/rustdoc-themes/Makefile
 run-make/rustdoc-verify-output-files/Makefile

tests/run-make/rustdoc-io-error/Makefile

@@ -0,0 +1,32 @@
+// This test verifies that rustdoc doesn't ICE when it encounters an IO error
+// while generating files. Ideally this would be a rustdoc-ui test, so we could
+// verify the error message as well.
+//
+// It operates by creating a temporary directory and modifying its
+// permissions so that it is not writable. We have to take special care to set
+// the permissions back to normal so that it's able to be deleted later.
+
+use run_make_support::{rustdoc, tmp_dir};
+use std::fs;
+
+fn main() {
+    let out_dir = tmp_dir().join("rustdoc-io-error");
+    let output = fs::create_dir(&out_dir).unwrap();
+    let mut permissions = fs::metadata(&out_dir).unwrap().permissions();
+    permissions.set_readonly(true);
+    fs::set_permissions(&out_dir, permissions.clone()).unwrap();
+
+    let output = rustdoc().input("foo.rs").output(&out_dir).command_output();
+
+    // Changing back permissions.
+    permissions.set_readonly(false);
+    fs::set_permissions(&out_dir, permissions).unwrap();
+
+    // Checks that rustdoc failed with the error code 1.
+    #[cfg(unix)]
+    assert_eq!(output.status.code().unwrap(), 1);
+    assert!(!output.status.success());
+    let stderr = String::from_utf8(output.stderr).unwrap();
+
+    assert!(stderr.contains("error: couldn't generate documentation: Permission denied"));
+}

tests/run-make/rustdoc-io-error/rmake.rs

@@ -0,0 +1,14 @@
+use run_make_support::{rustc, rustdoc, Diff};
+
+fn compare_outputs(args: &[&str]) {
+    let rustc_output = String::from_utf8(rustc().args(args).command_output().stdout).unwrap();
+    let rustdoc_output = String::from_utf8(rustdoc().args(args).command_output().stdout).unwrap();
+
+    Diff::new().expected_text("rustc", rustc_output).actual_text("rustdoc", rustdoc_output).run();
+}
+
+fn main() {
+    compare_outputs(&["-C", "help"]);
+    compare_outputs(&["-Z", "help"]);
+    compare_outputs(&["-C", "passes=list"]);
+}

tests/run-make/rustdoc-shared-flags/Makefile

@@ -1,6 +1,7 @@
 Available passes for running rustdoc:
 check-custom-code-classes - check for custom code classes without the feature-gate enabled
 check_doc_test_visibility - run various visibility-related lints on doctests
+strip-aliased-non-local - strips all non-local private aliased items from the output
         strip-hidden - strips all `#[doc(hidden)]` items from the output
        strip-private - strips all private items from a crate which cannot be seen externally, implies strip-priv-imports
   strip-priv-imports - strips all private import statements (`use`, `extern crate`) from a crate
@@ -14,6 +15,7 @@ Default passes for rustdoc:
 check-custom-code-classes
  collect-trait-impls
 check_doc_test_visibility
+strip-aliased-non-local
         strip-hidden  (when not --document-hidden-items)
        strip-private  (when not --document-private-items)
   strip-priv-imports  (when --document-private-items)

tests/run-make/rustdoc-shared-flags/rmake.rs

@@ -0,0 +1,11 @@
+//! This test makes sure that with never show the inner fields in the
+//! aliased type view of type alias.
+
+//@ compile-flags: -Z unstable-options --document-private-items
+
+#![crate_name = "foo"]
+
+use std::collections::BTreeMap;
+
+// @has 'foo/type.FooBar.html' '//*[@class="rust item-decl"]/code' 'struct FooBar { /* private fields */ }'
+pub type FooBar = BTreeMap<u32, String>;