Move some alloc tests to the alloctests crate

Unit tests directly inside of standard library crates require a very
fragile way of building that is hard to reproduce outside of bootstrap.

1 files changed, 0 insertions, 717 deletions

diff --git a/library/alloc/src/sync/tests.rs b/library/alloc/src/sync/tests.rs
deleted file mode 100644
index de5816fda97..00000000000
--- a/library/alloc/src/sync/tests.rs
+++ /dev/null
@@ -1,717 +0,0 @@
-use std::clone::Clone;
-use std::mem::MaybeUninit;
-use std::option::Option::None;
-use std::sync::Mutex;
-use std::sync::atomic::AtomicUsize;
-use std::sync::atomic::Ordering::SeqCst;
-use std::sync::mpsc::channel;
-use std::thread;
-
-use super::*;
-
-struct Canary(*mut AtomicUsize);
-
-impl Drop for Canary {
-    fn drop(&mut self) {
-        unsafe {
-            match *self {
-                Canary(c) => {
-                    (*c).fetch_add(1, SeqCst);
-                }
-            }
-        }
-    }
-}
-
-struct AllocCanary<'a>(&'a AtomicUsize);
-
-impl<'a> AllocCanary<'a> {
-    fn new(counter: &'a AtomicUsize) -> Self {
-        counter.fetch_add(1, SeqCst);
-        Self(counter)
-    }
-}
-
-unsafe impl Allocator for AllocCanary<'_> {
-    fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError> {
-        std::alloc::Global.allocate(layout)
-    }
-
-    unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout) {
-        unsafe { std::alloc::Global.deallocate(ptr, layout) }
-    }
-}
-
-impl Clone for AllocCanary<'_> {
-    fn clone(&self) -> Self {
-        Self::new(self.0)
-    }
-}
-
-impl Drop for AllocCanary<'_> {
-    fn drop(&mut self) {
-        self.0.fetch_sub(1, SeqCst);
-    }
-}
-
-#[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
-fn manually_share_arc() {
-    let v = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
-    let arc_v = Arc::new(v);
-
-    let (tx, rx) = channel();
-
-    let _t = thread::spawn(move || {
-        let arc_v: Arc<Vec<i32>> = rx.recv().unwrap();
-        assert_eq!((*arc_v)[3], 4);
-    });
-
-    tx.send(arc_v.clone()).unwrap();
-
-    assert_eq!((*arc_v)[2], 3);
-    assert_eq!((*arc_v)[4], 5);
-}
-
-#[test]
-fn test_arc_get_mut() {
-    let mut x = Arc::new(3);
-    *Arc::get_mut(&mut x).unwrap() = 4;
-    assert_eq!(*x, 4);
-    let y = x.clone();
-    assert!(Arc::get_mut(&mut x).is_none());
-    drop(y);
-    assert!(Arc::get_mut(&mut x).is_some());
-    let _w = Arc::downgrade(&x);
-    assert!(Arc::get_mut(&mut x).is_none());
-}
-
-#[test]
-fn weak_counts() {
-    assert_eq!(Weak::weak_count(&Weak::<u64>::new()), 0);
-    assert_eq!(Weak::strong_count(&Weak::<u64>::new()), 0);
-
-    let a = Arc::new(0);
-    let w = Arc::downgrade(&a);
-    assert_eq!(Weak::strong_count(&w), 1);
-    assert_eq!(Weak::weak_count(&w), 1);
-    let w2 = w.clone();
-    assert_eq!(Weak::strong_count(&w), 1);
-    assert_eq!(Weak::weak_count(&w), 2);
-    assert_eq!(Weak::strong_count(&w2), 1);
-    assert_eq!(Weak::weak_count(&w2), 2);
-    drop(w);
-    assert_eq!(Weak::strong_count(&w2), 1);
-    assert_eq!(Weak::weak_count(&w2), 1);
-    let a2 = a.clone();
-    assert_eq!(Weak::strong_count(&w2), 2);
-    assert_eq!(Weak::weak_count(&w2), 1);
-    drop(a2);
-    drop(a);
-    assert_eq!(Weak::strong_count(&w2), 0);
-    assert_eq!(Weak::weak_count(&w2), 0);
-    drop(w2);
-}
-
-#[test]
-fn try_unwrap() {
-    let x = Arc::new(3);
-    assert_eq!(Arc::try_unwrap(x), Ok(3));
-    let x = Arc::new(4);
-    let _y = x.clone();
-    assert_eq!(Arc::try_unwrap(x), Err(Arc::new(4)));
-    let x = Arc::new(5);
-    let _w = Arc::downgrade(&x);
-    assert_eq!(Arc::try_unwrap(x), Ok(5));
-}
-
-#[test]
-fn into_inner() {
-    for _ in 0..100
-    // ^ Increase chances of hitting potential race conditions
-    {
-        let x = Arc::new(3);
-        let y = Arc::clone(&x);
-        let r_thread = std::thread::spawn(|| Arc::into_inner(x));
-        let s_thread = std::thread::spawn(|| Arc::into_inner(y));
-        let r = r_thread.join().expect("r_thread panicked");
-        let s = s_thread.join().expect("s_thread panicked");
-        assert!(
-            matches!((r, s), (None, Some(3)) | (Some(3), None)),
-            "assertion failed: unexpected result `{:?}`\
-            \n  expected `(None, Some(3))` or `(Some(3), None)`",
-            (r, s),
-        );
-    }
-
-    let x = Arc::new(3);
-    assert_eq!(Arc::into_inner(x), Some(3));
-
-    let x = Arc::new(4);
-    let y = Arc::clone(&x);
-    assert_eq!(Arc::into_inner(x), None);
-    assert_eq!(Arc::into_inner(y), Some(4));
-
-    let x = Arc::new(5);
-    let _w = Arc::downgrade(&x);
-    assert_eq!(Arc::into_inner(x), Some(5));
-}
-
-#[test]
-fn into_from_raw() {
-    let x = Arc::new(Box::new("hello"));
-    let y = x.clone();
-
-    let x_ptr = Arc::into_raw(x);
-    drop(y);
-    unsafe {
-        assert_eq!(**x_ptr, "hello");
-
-        let x = Arc::from_raw(x_ptr);
-        assert_eq!(**x, "hello");
-
-        assert_eq!(Arc::try_unwrap(x).map(|x| *x), Ok("hello"));
-    }
-}
-
-#[test]
-fn test_into_from_raw_unsized() {
-    use std::fmt::Display;
-    use std::string::ToString;
-
-    let arc: Arc<str> = Arc::from("foo");
-
-    let ptr = Arc::into_raw(arc.clone());
-    let arc2 = unsafe { Arc::from_raw(ptr) };
-
-    assert_eq!(unsafe { &*ptr }, "foo");
-    assert_eq!(arc, arc2);
-
-    let arc: Arc<dyn Display> = Arc::new(123);
-
-    let ptr = Arc::into_raw(arc.clone());
-    let arc2 = unsafe { Arc::from_raw(ptr) };
-
-    assert_eq!(unsafe { &*ptr }.to_string(), "123");
-    assert_eq!(arc2.to_string(), "123");
-}
-
-#[test]
-fn into_from_weak_raw() {
-    let x = Arc::new(Box::new("hello"));
-    let y = Arc::downgrade(&x);
-
-    let y_ptr = Weak::into_raw(y);
-    unsafe {
-        assert_eq!(**y_ptr, "hello");
-
-        let y = Weak::from_raw(y_ptr);
-        let y_up = Weak::upgrade(&y).unwrap();
-        assert_eq!(**y_up, "hello");
-        drop(y_up);
-
-        assert_eq!(Arc::try_unwrap(x).map(|x| *x), Ok("hello"));
-    }
-}
-
-#[test]
-fn test_into_from_weak_raw_unsized() {
-    use std::fmt::Display;
-    use std::string::ToString;
-
-    let arc: Arc<str> = Arc::from("foo");
-    let weak: Weak<str> = Arc::downgrade(&arc);
-
-    let ptr = Weak::into_raw(weak.clone());
-    let weak2 = unsafe { Weak::from_raw(ptr) };
-
-    assert_eq!(unsafe { &*ptr }, "foo");
-    assert!(weak.ptr_eq(&weak2));
-
-    let arc: Arc<dyn Display> = Arc::new(123);
-    let weak: Weak<dyn Display> = Arc::downgrade(&arc);
-
-    let ptr = Weak::into_raw(weak.clone());
-    let weak2 = unsafe { Weak::from_raw(ptr) };
-
-    assert_eq!(unsafe { &*ptr }.to_string(), "123");
-    assert!(weak.ptr_eq(&weak2));
-}
-
-#[test]
-fn test_cowarc_clone_make_mut() {
-    let mut cow0 = Arc::new(75);
-    let mut cow1 = cow0.clone();
-    let mut cow2 = cow1.clone();
-
-    assert!(75 == *Arc::make_mut(&mut cow0));
-    assert!(75 == *Arc::make_mut(&mut cow1));
-    assert!(75 == *Arc::make_mut(&mut cow2));
-
-    *Arc::make_mut(&mut cow0) += 1;
-    *Arc::make_mut(&mut cow1) += 2;
-    *Arc::make_mut(&mut cow2) += 3;
-
-    assert!(76 == *cow0);
-    assert!(77 == *cow1);
-    assert!(78 == *cow2);
-
-    // none should point to the same backing memory
-    assert!(*cow0 != *cow1);
-    assert!(*cow0 != *cow2);
-    assert!(*cow1 != *cow2);
-}
-
-#[test]
-fn test_cowarc_clone_unique2() {
-    let mut cow0 = Arc::new(75);
-    let cow1 = cow0.clone();
-    let cow2 = cow1.clone();
-
-    assert!(75 == *cow0);
-    assert!(75 == *cow1);
-    assert!(75 == *cow2);
-
-    *Arc::make_mut(&mut cow0) += 1;
-    assert!(76 == *cow0);
-    assert!(75 == *cow1);
-    assert!(75 == *cow2);
-
-    // cow1 and cow2 should share the same contents
-    // cow0 should have a unique reference
-    assert!(*cow0 != *cow1);
-    assert!(*cow0 != *cow2);
-    assert!(*cow1 == *cow2);
-}
-
-#[test]
-fn test_cowarc_clone_weak() {
-    let mut cow0 = Arc::new(75);
-    let cow1_weak = Arc::downgrade(&cow0);
-
-    assert!(75 == *cow0);
-    assert!(75 == *cow1_weak.upgrade().unwrap());
-
-    *Arc::make_mut(&mut cow0) += 1;
-
-    assert!(76 == *cow0);
-    assert!(cow1_weak.upgrade().is_none());
-}
-
-#[test]
-fn test_live() {
-    let x = Arc::new(5);
-    let y = Arc::downgrade(&x);
-    assert!(y.upgrade().is_some());
-}
-
-#[test]
-fn test_dead() {
-    let x = Arc::new(5);
-    let y = Arc::downgrade(&x);
-    drop(x);
-    assert!(y.upgrade().is_none());
-}
-
-#[test]
-fn weak_self_cyclic() {
-    struct Cycle {
-        x: Mutex<Option<Weak<Cycle>>>,
-    }
-
-    let a = Arc::new(Cycle { x: Mutex::new(None) });
-    let b = Arc::downgrade(&a.clone());
-    *a.x.lock().unwrap() = Some(b);
-
-    // hopefully we don't double-free (or leak)...
-}
-
-#[test]
-fn drop_arc() {
-    let mut canary = AtomicUsize::new(0);
-    let x = Arc::new(Canary(&mut canary as *mut AtomicUsize));
-    drop(x);
-    assert!(canary.load(Acquire) == 1);
-}
-
-#[test]
-fn drop_arc_weak() {
-    let mut canary = AtomicUsize::new(0);
-    let arc = Arc::new(Canary(&mut canary as *mut AtomicUsize));
-    let arc_weak = Arc::downgrade(&arc);
-    assert!(canary.load(Acquire) == 0);
-    drop(arc);
-    assert!(canary.load(Acquire) == 1);
-    drop(arc_weak);
-}
-
-#[test]
-fn test_strong_count() {
-    let a = Arc::new(0);
-    assert!(Arc::strong_count(&a) == 1);
-    let w = Arc::downgrade(&a);
-    assert!(Arc::strong_count(&a) == 1);
-    let b = w.upgrade().expect("");
-    assert!(Arc::strong_count(&b) == 2);
-    assert!(Arc::strong_count(&a) == 2);
-    drop(w);
-    drop(a);
-    assert!(Arc::strong_count(&b) == 1);
-    let c = b.clone();
-    assert!(Arc::strong_count(&b) == 2);
-    assert!(Arc::strong_count(&c) == 2);
-}
-
-#[test]
-fn test_weak_count() {
-    let a = Arc::new(0);
-    assert!(Arc::strong_count(&a) == 1);
-    assert!(Arc::weak_count(&a) == 0);
-    let w = Arc::downgrade(&a);
-    assert!(Arc::strong_count(&a) == 1);
-    assert!(Arc::weak_count(&a) == 1);
-    let x = w.clone();
-    assert!(Arc::weak_count(&a) == 2);
-    drop(w);
-    drop(x);
-    assert!(Arc::strong_count(&a) == 1);
-    assert!(Arc::weak_count(&a) == 0);
-    let c = a.clone();
-    assert!(Arc::strong_count(&a) == 2);
-    assert!(Arc::weak_count(&a) == 0);
-    let d = Arc::downgrade(&c);
-    assert!(Arc::weak_count(&c) == 1);
-    assert!(Arc::strong_count(&c) == 2);
-
-    drop(a);
-    drop(c);
-    drop(d);
-}
-
-#[test]
-fn show_arc() {
-    let a = Arc::new(5);
-    assert_eq!(format!("{a:?}"), "5");
-}
-
-// Make sure deriving works with Arc<T>
-#[derive(Eq, Ord, PartialEq, PartialOrd, Clone, Debug, Default)]
-struct _Foo {
-    inner: Arc<i32>,
-}
-
-#[test]
-fn test_unsized() {
-    let x: Arc<[i32]> = Arc::new([1, 2, 3]);
-    assert_eq!(format!("{x:?}"), "[1, 2, 3]");
-    let y = Arc::downgrade(&x.clone());
-    drop(x);
-    assert!(y.upgrade().is_none());
-}
-
-#[test]
-fn test_maybe_thin_unsized() {
-    // If/when custom thin DSTs exist, this test should be updated to use one
-    use std::ffi::CStr;
-
-    let x: Arc<CStr> = Arc::from(c"swordfish");
-    assert_eq!(format!("{x:?}"), "\"swordfish\"");
-    let y: Weak<CStr> = Arc::downgrade(&x);
-    drop(x);
-
-    // At this point, the weak points to a dropped DST
-    assert!(y.upgrade().is_none());
-    // But we still need to be able to get the alloc layout to drop.
-    // CStr has no drop glue, but custom DSTs might, and need to work.
-    drop(y);
-}
-
-#[test]
-fn test_from_owned() {
-    let foo = 123;
-    let foo_arc = Arc::from(foo);
-    assert!(123 == *foo_arc);
-}
-
-#[test]
-fn test_new_weak() {
-    let foo: Weak<usize> = Weak::new();
-    assert!(foo.upgrade().is_none());
-}
-
-#[test]
-fn test_ptr_eq() {
-    let five = Arc::new(5);
-    let same_five = five.clone();
-    let other_five = Arc::new(5);
-
-    assert!(Arc::ptr_eq(&five, &same_five));
-    assert!(!Arc::ptr_eq(&five, &other_five));
-}
-
-#[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
-fn test_weak_count_locked() {
-    let mut a = Arc::new(atomic::AtomicBool::new(false));
-    let a2 = a.clone();
-    let t = thread::spawn(move || {
-        // Miri is too slow
-        let count = if cfg!(miri) { 1000 } else { 1000000 };
-        for _i in 0..count {
-            Arc::get_mut(&mut a);
-        }
-        a.store(true, SeqCst);
-    });
-
-    while !a2.load(SeqCst) {
-        let n = Arc::weak_count(&a2);
-        assert!(n < 2, "bad weak count: {}", n);
-        #[cfg(miri)] // Miri's scheduler does not guarantee liveness, and thus needs this hint.
-        std::hint::spin_loop();
-    }
-    t.join().unwrap();
-}
-
-#[test]
-fn test_from_str() {
-    let r: Arc<str> = Arc::from("foo");
-
-    assert_eq!(&r[..], "foo");
-}
-
-#[test]
-fn test_copy_from_slice() {
-    let s: &[u32] = &[1, 2, 3];
-    let r: Arc<[u32]> = Arc::from(s);
-
-    assert_eq!(&r[..], [1, 2, 3]);
-}
-
-#[test]
-fn test_clone_from_slice() {
-    #[derive(Clone, Debug, Eq, PartialEq)]
-    struct X(u32);
-
-    let s: &[X] = &[X(1), X(2), X(3)];
-    let r: Arc<[X]> = Arc::from(s);
-
-    assert_eq!(&r[..], s);
-}
-
-#[test]
-#[should_panic]
-fn test_clone_from_slice_panic() {
-    use std::string::{String, ToString};
-
-    struct Fail(u32, String);
-
-    impl Clone for Fail {
-        fn clone(&self) -> Fail {
-            if self.0 == 2 {
-                panic!();
-            }
-            Fail(self.0, self.1.clone())
-        }
-    }
-
-    let s: &[Fail] =
-        &[Fail(0, "foo".to_string()), Fail(1, "bar".to_string()), Fail(2, "baz".to_string())];
-
-    // Should panic, but not cause memory corruption
-    let _r: Arc<[Fail]> = Arc::from(s);
-}
-
-#[test]
-fn test_from_box() {
-    let b: Box<u32> = Box::new(123);
-    let r: Arc<u32> = Arc::from(b);
-
-    assert_eq!(*r, 123);
-}
-
-#[test]
-fn test_from_box_str() {
-    use std::string::String;
-
-    let s = String::from("foo").into_boxed_str();
-    let r: Arc<str> = Arc::from(s);
-
-    assert_eq!(&r[..], "foo");
-}
-
-#[test]
-fn test_from_box_slice() {
-    let s = vec![1, 2, 3].into_boxed_slice();
-    let r: Arc<[u32]> = Arc::from(s);
-
-    assert_eq!(&r[..], [1, 2, 3]);
-}
-
-#[test]
-fn test_from_box_trait() {
-    use std::fmt::Display;
-    use std::string::ToString;
-
-    let b: Box<dyn Display> = Box::new(123);
-    let r: Arc<dyn Display> = Arc::from(b);
-
-    assert_eq!(r.to_string(), "123");
-}
-
-#[test]
-fn test_from_box_trait_zero_sized() {
-    use std::fmt::Debug;
-
-    let b: Box<dyn Debug> = Box::new(());
-    let r: Arc<dyn Debug> = Arc::from(b);
-
-    assert_eq!(format!("{r:?}"), "()");
-}
-
-#[test]
-fn test_from_vec() {
-    let v = vec![1, 2, 3];
-    let r: Arc<[u32]> = Arc::from(v);
-
-    assert_eq!(&r[..], [1, 2, 3]);
-}
-
-#[test]
-fn test_downcast() {
-    use std::any::Any;
-
-    let r1: Arc<dyn Any + Send + Sync> = Arc::new(i32::MAX);
-    let r2: Arc<dyn Any + Send + Sync> = Arc::new("abc");
-
-    assert!(r1.clone().downcast::<u32>().is_err());
-
-    let r1i32 = r1.downcast::<i32>();
-    assert!(r1i32.is_ok());
-    assert_eq!(r1i32.unwrap(), Arc::new(i32::MAX));
-
-    assert!(r2.clone().downcast::<i32>().is_err());
-
-    let r2str = r2.downcast::<&'static str>();
-    assert!(r2str.is_ok());
-    assert_eq!(r2str.unwrap(), Arc::new("abc"));
-}
-
-#[test]
-fn test_array_from_slice() {
-    let v = vec![1, 2, 3];
-    let r: Arc<[u32]> = Arc::from(v);
-
-    let a: Result<Arc<[u32; 3]>, _> = r.clone().try_into();
-    assert!(a.is_ok());
-
-    let a: Result<Arc<[u32; 2]>, _> = r.clone().try_into();
-    assert!(a.is_err());
-}
-
-#[test]
-fn test_arc_cyclic_with_zero_refs() {
-    struct ZeroRefs {
-        inner: Weak<ZeroRefs>,
-    }
-    let zero_refs = Arc::new_cyclic(|inner| {
-        assert_eq!(inner.strong_count(), 0);
-        assert!(inner.upgrade().is_none());
-        ZeroRefs { inner: Weak::new() }
-    });
-
-    assert_eq!(Arc::strong_count(&zero_refs), 1);
-    assert_eq!(Arc::weak_count(&zero_refs), 0);
-    assert_eq!(zero_refs.inner.strong_count(), 0);
-    assert_eq!(zero_refs.inner.weak_count(), 0);
-}
-
-#[test]
-fn test_arc_new_cyclic_one_ref() {
-    struct OneRef {
-        inner: Weak<OneRef>,
-    }
-    let one_ref = Arc::new_cyclic(|inner| {
-        assert_eq!(inner.strong_count(), 0);
-        assert!(inner.upgrade().is_none());
-        OneRef { inner: inner.clone() }
-    });
-
-    assert_eq!(Arc::strong_count(&one_ref), 1);
-    assert_eq!(Arc::weak_count(&one_ref), 1);
-
-    let one_ref2 = Weak::upgrade(&one_ref.inner).unwrap();
-    assert!(Arc::ptr_eq(&one_ref, &one_ref2));
-
-    assert_eq!(Arc::strong_count(&one_ref), 2);
-    assert_eq!(Arc::weak_count(&one_ref), 1);
-}
-
-#[test]
-fn test_arc_cyclic_two_refs() {
-    struct TwoRefs {
-        inner1: Weak<TwoRefs>,
-        inner2: Weak<TwoRefs>,
-    }
-    let two_refs = Arc::new_cyclic(|inner| {
-        assert_eq!(inner.strong_count(), 0);
-        assert!(inner.upgrade().is_none());
-
-        let inner1 = inner.clone();
-        let inner2 = inner1.clone();
-
-        TwoRefs { inner1, inner2 }
-    });
-
-    assert_eq!(Arc::strong_count(&two_refs), 1);
-    assert_eq!(Arc::weak_count(&two_refs), 2);
-
-    let two_refs1 = Weak::upgrade(&two_refs.inner1).unwrap();
-    assert!(Arc::ptr_eq(&two_refs, &two_refs1));
-
-    let two_refs2 = Weak::upgrade(&two_refs.inner2).unwrap();
-    assert!(Arc::ptr_eq(&two_refs, &two_refs2));
-
-    assert_eq!(Arc::strong_count(&two_refs), 3);
-    assert_eq!(Arc::weak_count(&two_refs), 2);
-}
-
-/// Test for Arc::drop bug (https://github.com/rust-lang/rust/issues/55005)
-#[test]
-#[cfg(miri)] // relies on Stacked Borrows in Miri
-fn arc_drop_dereferenceable_race() {
-    // The bug seems to take up to 700 iterations to reproduce with most seeds (tested 0-9).
-    for _ in 0..750 {
-        let arc_1 = Arc::new(());
-        let arc_2 = arc_1.clone();
-        let thread = thread::spawn(|| drop(arc_2));
-        // Spin a bit; makes the race more likely to appear
-        let mut i = 0;
-        while i < 256 {
-            i += 1;
-        }
-        drop(arc_1);
-        thread.join().unwrap();
-    }
-}
-
-#[test]
-fn arc_doesnt_leak_allocator() {
-    let counter = AtomicUsize::new(0);
-
-    {
-        let arc: Arc<dyn Any + Send + Sync, _> = Arc::new_in(5usize, AllocCanary::new(&counter));
-        drop(arc.downcast::<usize>().unwrap());
-
-        let arc: Arc<dyn Any + Send + Sync, _> = Arc::new_in(5usize, AllocCanary::new(&counter));
-        drop(unsafe { arc.downcast_unchecked::<usize>() });
-
-        let arc = Arc::new_in(MaybeUninit::<usize>::new(5usize), AllocCanary::new(&counter));
-        drop(unsafe { arc.assume_init() });
-
-        let arc: Arc<[MaybeUninit<usize>], _> =
-            Arc::new_zeroed_slice_in(5, AllocCanary::new(&counter));
-        drop(unsafe { arc.assume_init() });
-    }
-
-    assert_eq!(counter.load(SeqCst), 0);
-}