Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

1 files changed, 374 insertions, 0 deletions

diff --git a/vendor/crossbeam-utils/tests/atomic_cell.rs b/vendor/crossbeam-utils/tests/atomic_cell.rs
new file mode 100644
index 0000000..7a2689d
--- /dev/null
+++ b/vendor/crossbeam-utils/tests/atomic_cell.rs
@@ -0,0 +1,374 @@
+use std::mem;
+use std::sync::atomic::AtomicUsize;
+use std::sync::atomic::Ordering::SeqCst;
+
+use crossbeam_utils::atomic::AtomicCell;
+
+#[test]
+fn is_lock_free() {
+    struct UsizeWrap(usize);
+    struct U8Wrap(bool);
+    struct I16Wrap(i16);
+    #[repr(align(8))]
+    struct U64Align8(u64);
+
+    assert!(AtomicCell::<usize>::is_lock_free());
+    assert!(AtomicCell::<isize>::is_lock_free());
+    assert!(AtomicCell::<UsizeWrap>::is_lock_free());
+
+    assert!(AtomicCell::<()>::is_lock_free());
+
+    assert!(AtomicCell::<u8>::is_lock_free());
+    assert!(AtomicCell::<i8>::is_lock_free());
+    assert!(AtomicCell::<bool>::is_lock_free());
+    assert!(AtomicCell::<U8Wrap>::is_lock_free());
+
+    assert!(AtomicCell::<u16>::is_lock_free());
+    assert!(AtomicCell::<i16>::is_lock_free());
+    assert!(AtomicCell::<I16Wrap>::is_lock_free());
+
+    assert!(AtomicCell::<u32>::is_lock_free());
+    assert!(AtomicCell::<i32>::is_lock_free());
+
+    // Sizes of both types must be equal, and the alignment of `u64` must be greater or equal than
+    // that of `AtomicU64`. In i686-unknown-linux-gnu, the alignment of `u64` is `4` and alignment
+    // of `AtomicU64` is `8`, so `AtomicCell<u64>` is not lock-free.
+    assert_eq!(
+        AtomicCell::<u64>::is_lock_free(),
+        cfg!(target_has_atomic = "64") && std::mem::align_of::<u64>() == 8
+    );
+    assert_eq!(mem::size_of::<U64Align8>(), 8);
+    assert_eq!(mem::align_of::<U64Align8>(), 8);
+    assert_eq!(
+        AtomicCell::<U64Align8>::is_lock_free(),
+        cfg!(target_has_atomic = "64")
+    );
+
+    // AtomicU128 is unstable
+    assert!(!AtomicCell::<u128>::is_lock_free());
+}
+
+#[test]
+fn const_is_lock_free() {
+    const _U: bool = AtomicCell::<usize>::is_lock_free();
+    const _I: bool = AtomicCell::<isize>::is_lock_free();
+}
+
+#[test]
+fn drops_unit() {
+    static CNT: AtomicUsize = AtomicUsize::new(0);
+    CNT.store(0, SeqCst);
+
+    #[derive(Debug, PartialEq, Eq)]
+    struct Foo();
+
+    impl Foo {
+        fn new() -> Foo {
+            CNT.fetch_add(1, SeqCst);
+            Foo()
+        }
+    }
+
+    impl Drop for Foo {
+        fn drop(&mut self) {
+            CNT.fetch_sub(1, SeqCst);
+        }
+    }
+
+    impl Default for Foo {
+        fn default() -> Foo {
+            Foo::new()
+        }
+    }
+
+    let a = AtomicCell::new(Foo::new());
+
+    assert_eq!(a.swap(Foo::new()), Foo::new());
+    assert_eq!(CNT.load(SeqCst), 1);
+
+    a.store(Foo::new());
+    assert_eq!(CNT.load(SeqCst), 1);
+
+    assert_eq!(a.swap(Foo::default()), Foo::new());
+    assert_eq!(CNT.load(SeqCst), 1);
+
+    drop(a);
+    assert_eq!(CNT.load(SeqCst), 0);
+}
+
+#[test]
+fn drops_u8() {
+    static CNT: AtomicUsize = AtomicUsize::new(0);
+    CNT.store(0, SeqCst);
+
+    #[derive(Debug, PartialEq, Eq)]
+    struct Foo(u8);
+
+    impl Foo {
+        fn new(val: u8) -> Foo {
+            CNT.fetch_add(1, SeqCst);
+            Foo(val)
+        }
+    }
+
+    impl Drop for Foo {
+        fn drop(&mut self) {
+            CNT.fetch_sub(1, SeqCst);
+        }
+    }
+
+    impl Default for Foo {
+        fn default() -> Foo {
+            Foo::new(0)
+        }
+    }
+
+    let a = AtomicCell::new(Foo::new(5));
+
+    assert_eq!(a.swap(Foo::new(6)), Foo::new(5));
+    assert_eq!(a.swap(Foo::new(1)), Foo::new(6));
+    assert_eq!(CNT.load(SeqCst), 1);
+
+    a.store(Foo::new(2));
+    assert_eq!(CNT.load(SeqCst), 1);
+
+    assert_eq!(a.swap(Foo::default()), Foo::new(2));
+    assert_eq!(CNT.load(SeqCst), 1);
+
+    assert_eq!(a.swap(Foo::default()), Foo::new(0));
+    assert_eq!(CNT.load(SeqCst), 1);
+
+    drop(a);
+    assert_eq!(CNT.load(SeqCst), 0);
+}
+
+#[test]
+fn drops_usize() {
+    static CNT: AtomicUsize = AtomicUsize::new(0);
+    CNT.store(0, SeqCst);
+
+    #[derive(Debug, PartialEq, Eq)]
+    struct Foo(usize);
+
+    impl Foo {
+        fn new(val: usize) -> Foo {
+            CNT.fetch_add(1, SeqCst);
+            Foo(val)
+        }
+    }
+
+    impl Drop for Foo {
+        fn drop(&mut self) {
+            CNT.fetch_sub(1, SeqCst);
+        }
+    }
+
+    impl Default for Foo {
+        fn default() -> Foo {
+            Foo::new(0)
+        }
+    }
+
+    let a = AtomicCell::new(Foo::new(5));
+
+    assert_eq!(a.swap(Foo::new(6)), Foo::new(5));
+    assert_eq!(a.swap(Foo::new(1)), Foo::new(6));
+    assert_eq!(CNT.load(SeqCst), 1);
+
+    a.store(Foo::new(2));
+    assert_eq!(CNT.load(SeqCst), 1);
+
+    assert_eq!(a.swap(Foo::default()), Foo::new(2));
+    assert_eq!(CNT.load(SeqCst), 1);
+
+    assert_eq!(a.swap(Foo::default()), Foo::new(0));
+    assert_eq!(CNT.load(SeqCst), 1);
+
+    drop(a);
+    assert_eq!(CNT.load(SeqCst), 0);
+}
+
+#[test]
+fn modular_u8() {
+    #[derive(Clone, Copy, Eq, Debug, Default)]
+    struct Foo(u8);
+
+    impl PartialEq for Foo {
+        fn eq(&self, other: &Foo) -> bool {
+            self.0 % 5 == other.0 % 5
+        }
+    }
+
+    let a = AtomicCell::new(Foo(1));
+
+    assert_eq!(a.load(), Foo(1));
+    assert_eq!(a.swap(Foo(2)), Foo(11));
+    assert_eq!(a.load(), Foo(52));
+
+    a.store(Foo(0));
+    assert_eq!(a.compare_exchange(Foo(0), Foo(5)), Ok(Foo(100)));
+    assert_eq!(a.load().0, 5);
+    assert_eq!(a.compare_exchange(Foo(10), Foo(15)), Ok(Foo(100)));
+    assert_eq!(a.load().0, 15);
+}
+
+#[test]
+fn modular_usize() {
+    #[derive(Clone, Copy, Eq, Debug, Default)]
+    struct Foo(usize);
+
+    impl PartialEq for Foo {
+        fn eq(&self, other: &Foo) -> bool {
+            self.0 % 5 == other.0 % 5
+        }
+    }
+
+    let a = AtomicCell::new(Foo(1));
+
+    assert_eq!(a.load(), Foo(1));
+    assert_eq!(a.swap(Foo(2)), Foo(11));
+    assert_eq!(a.load(), Foo(52));
+
+    a.store(Foo(0));
+    assert_eq!(a.compare_exchange(Foo(0), Foo(5)), Ok(Foo(100)));
+    assert_eq!(a.load().0, 5);
+    assert_eq!(a.compare_exchange(Foo(10), Foo(15)), Ok(Foo(100)));
+    assert_eq!(a.load().0, 15);
+}
+
+#[test]
+fn garbage_padding() {
+    #[derive(Copy, Clone, Eq, PartialEq)]
+    struct Object {
+        a: i64,
+        b: i32,
+    }
+
+    let cell = AtomicCell::new(Object { a: 0, b: 0 });
+    let _garbage = [0xfe, 0xfe, 0xfe, 0xfe, 0xfe]; // Needed
+    let next = Object { a: 0, b: 0 };
+
+    let prev = cell.load();
+    assert!(cell.compare_exchange(prev, next).is_ok());
+    println!();
+}
+
+#[test]
+fn const_atomic_cell_new() {
+    static CELL: AtomicCell<usize> = AtomicCell::new(0);
+
+    CELL.store(1);
+    assert_eq!(CELL.load(), 1);
+}
+
+// https://github.com/crossbeam-rs/crossbeam/pull/767
+macro_rules! test_arithmetic {
+    ($test_name:ident, $ty:ident) => {
+        #[test]
+        fn $test_name() {
+            let a: AtomicCell<$ty> = AtomicCell::new(7);
+
+            assert_eq!(a.fetch_add(3), 7);
+            assert_eq!(a.load(), 10);
+
+            assert_eq!(a.fetch_sub(3), 10);
+            assert_eq!(a.load(), 7);
+
+            assert_eq!(a.fetch_and(3), 7);
+            assert_eq!(a.load(), 3);
+
+            assert_eq!(a.fetch_or(16), 3);
+            assert_eq!(a.load(), 19);
+
+            assert_eq!(a.fetch_xor(2), 19);
+            assert_eq!(a.load(), 17);
+
+            assert_eq!(a.fetch_max(18), 17);
+            assert_eq!(a.load(), 18);
+
+            assert_eq!(a.fetch_min(17), 18);
+            assert_eq!(a.load(), 17);
+
+            assert_eq!(a.fetch_nand(7), 17);
+            assert_eq!(a.load(), !(17 & 7));
+        }
+    };
+}
+test_arithmetic!(arithmetic_u8, u8);
+test_arithmetic!(arithmetic_i8, i8);
+test_arithmetic!(arithmetic_u16, u16);
+test_arithmetic!(arithmetic_i16, i16);
+test_arithmetic!(arithmetic_u32, u32);
+test_arithmetic!(arithmetic_i32, i32);
+test_arithmetic!(arithmetic_u64, u64);
+test_arithmetic!(arithmetic_i64, i64);
+test_arithmetic!(arithmetic_u128, u128);
+test_arithmetic!(arithmetic_i128, i128);
+
+// https://github.com/crossbeam-rs/crossbeam/issues/748
+#[cfg_attr(miri, ignore)] // TODO
+#[test]
+fn issue_748() {
+    #[allow(dead_code)]
+    #[repr(align(8))]
+    #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+    enum Test {
+        Field(u32),
+        FieldLess,
+    }
+
+    assert_eq!(mem::size_of::<Test>(), 8);
+    assert_eq!(
+        AtomicCell::<Test>::is_lock_free(),
+        cfg!(target_has_atomic = "64")
+    );
+    let x = AtomicCell::new(Test::FieldLess);
+    assert_eq!(x.load(), Test::FieldLess);
+}
+
+// https://github.com/crossbeam-rs/crossbeam/issues/833
+#[test]
+fn issue_833() {
+    use std::num::NonZeroU128;
+    use std::sync::atomic::{AtomicBool, Ordering};
+    use std::thread;
+
+    #[cfg(miri)]
+    const N: usize = 10_000;
+    #[cfg(not(miri))]
+    const N: usize = 1_000_000;
+
+    #[allow(dead_code)]
+    enum Enum {
+        NeverConstructed,
+        Cell(AtomicCell<NonZeroU128>),
+    }
+
+    static STATIC: Enum = Enum::Cell(AtomicCell::new(match NonZeroU128::new(1) {
+        Some(nonzero) => nonzero,
+        None => unreachable!(),
+    }));
+    static FINISHED: AtomicBool = AtomicBool::new(false);
+
+    let handle = thread::spawn(|| {
+        let cell = match &STATIC {
+            Enum::NeverConstructed => unreachable!(),
+            Enum::Cell(cell) => cell,
+        };
+        let x = NonZeroU128::new(0xFFFF_FFFF_FFFF_FFFF_0000_0000_0000_0000).unwrap();
+        let y = NonZeroU128::new(0x0000_0000_0000_0000_FFFF_FFFF_FFFF_FFFF).unwrap();
+        while !FINISHED.load(Ordering::Relaxed) {
+            cell.store(x);
+            cell.store(y);
+        }
+    });
+
+    for _ in 0..N {
+        if let Enum::NeverConstructed = STATIC {
+            unreachable!(":(");
+        }
+    }
+
+    FINISHED.store(true, Ordering::Relaxed);
+    handle.join().unwrap();
+}