Update upstream source from tag 'upstream/1.52.1+dfsg1'

[rustc.git] / vendor / rustc-ap-rustc_arena / src / tests.rs

diff --git a/vendor/rustc-ap-rustc_arena/src/tests.rs b/vendor/rustc-ap-rustc_arena/src/tests.rs
new file mode 100644 (file)
index 0000000..e8a1f2d
--- /dev/null
+++ b/vendor/rustc-ap-rustc_arena/src/tests.rs
@@ -0,0 +1,214 @@
+extern crate test;
+use super::TypedArena;
+use std::cell::Cell;
+use test::Bencher;
+
+#[allow(dead_code)]
+#[derive(Debug, Eq, PartialEq)]
+struct Point {
+    x: i32,
+    y: i32,
+    z: i32,
+}
+
+#[test]
+pub fn test_unused() {
+    let arena: TypedArena<Point> = TypedArena::default();
+    assert!(arena.chunks.borrow().is_empty());
+}
+
+#[test]
+fn test_arena_alloc_nested() {
+    struct Inner {
+        value: u8,
+    }
+    struct Outer<'a> {
+        inner: &'a Inner,
+    }
+    enum EI<'e> {
+        I(Inner),
+        O(Outer<'e>),
+    }
+
+    struct Wrap<'a>(TypedArena<EI<'a>>);
+
+    impl<'a> Wrap<'a> {
+        fn alloc_inner<F: Fn() -> Inner>(&self, f: F) -> &Inner {
+            let r: &EI<'_> = self.0.alloc(EI::I(f()));
+            if let &EI::I(ref i) = r {
+                i
+            } else {
+                panic!("mismatch");
+            }
+        }
+        fn alloc_outer<F: Fn() -> Outer<'a>>(&self, f: F) -> &Outer<'_> {
+            let r: &EI<'_> = self.0.alloc(EI::O(f()));
+            if let &EI::O(ref o) = r {
+                o
+            } else {
+                panic!("mismatch");
+            }
+        }
+    }
+
+    let arena = Wrap(TypedArena::default());
+
+    let result = arena.alloc_outer(|| Outer { inner: arena.alloc_inner(|| Inner { value: 10 }) });
+
+    assert_eq!(result.inner.value, 10);
+}
+
+#[test]
+pub fn test_copy() {
+    let arena = TypedArena::default();
+    for _ in 0..100000 {
+        arena.alloc(Point { x: 1, y: 2, z: 3 });
+    }
+}
+
+#[bench]
+pub fn bench_copy(b: &mut Bencher) {
+    let arena = TypedArena::default();
+    b.iter(|| arena.alloc(Point { x: 1, y: 2, z: 3 }))
+}
+
+#[bench]
+pub fn bench_copy_nonarena(b: &mut Bencher) {
+    b.iter(|| {
+        let _: Box<_> = Box::new(Point { x: 1, y: 2, z: 3 });
+    })
+}
+
+#[allow(dead_code)]
+struct Noncopy {
+    string: String,
+    array: Vec<i32>,
+}
+
+#[test]
+pub fn test_noncopy() {
+    let arena = TypedArena::default();
+    for _ in 0..100000 {
+        arena.alloc(Noncopy { string: "hello world".to_string(), array: vec![1, 2, 3, 4, 5] });
+    }
+}
+
+#[test]
+pub fn test_typed_arena_zero_sized() {
+    let arena = TypedArena::default();
+    for _ in 0..100000 {
+        arena.alloc(());
+    }
+}
+
+#[test]
+pub fn test_typed_arena_clear() {
+    let mut arena = TypedArena::default();
+    for _ in 0..10 {
+        arena.clear();
+        for _ in 0..10000 {
+            arena.alloc(Point { x: 1, y: 2, z: 3 });
+        }
+    }
+}
+
+#[bench]
+pub fn bench_typed_arena_clear(b: &mut Bencher) {
+    let mut arena = TypedArena::default();
+    b.iter(|| {
+        arena.alloc(Point { x: 1, y: 2, z: 3 });
+        arena.clear();
+    })
+}
+
+#[bench]
+pub fn bench_typed_arena_clear_100(b: &mut Bencher) {
+    let mut arena = TypedArena::default();
+    b.iter(|| {
+        for _ in 0..100 {
+            arena.alloc(Point { x: 1, y: 2, z: 3 });
+        }
+        arena.clear();
+    })
+}
+
+// Drop tests
+
+struct DropCounter<'a> {
+    count: &'a Cell<u32>,
+}
+
+impl Drop for DropCounter<'_> {
+    fn drop(&mut self) {
+        self.count.set(self.count.get() + 1);
+    }
+}
+
+#[test]
+fn test_typed_arena_drop_count() {
+    let counter = Cell::new(0);
+    {
+        let arena: TypedArena<DropCounter<'_>> = TypedArena::default();
+        for _ in 0..100 {
+            // Allocate something with drop glue to make sure it doesn't leak.
+            arena.alloc(DropCounter { count: &counter });
+        }
+    };
+    assert_eq!(counter.get(), 100);
+}
+
+#[test]
+fn test_typed_arena_drop_on_clear() {
+    let counter = Cell::new(0);
+    let mut arena: TypedArena<DropCounter<'_>> = TypedArena::default();
+    for i in 0..10 {
+        for _ in 0..100 {
+            // Allocate something with drop glue to make sure it doesn't leak.
+            arena.alloc(DropCounter { count: &counter });
+        }
+        arena.clear();
+        assert_eq!(counter.get(), i * 100 + 100);
+    }
+}
+
+thread_local! {
+    static DROP_COUNTER: Cell<u32> = Cell::new(0)
+}
+
+struct SmallDroppable;
+
+impl Drop for SmallDroppable {
+    fn drop(&mut self) {
+        DROP_COUNTER.with(|c| c.set(c.get() + 1));
+    }
+}
+
+#[test]
+fn test_typed_arena_drop_small_count() {
+    DROP_COUNTER.with(|c| c.set(0));
+    {
+        let arena: TypedArena<SmallDroppable> = TypedArena::default();
+        for _ in 0..100 {
+            // Allocate something with drop glue to make sure it doesn't leak.
+            arena.alloc(SmallDroppable);
+        }
+        // dropping
+    };
+    assert_eq!(DROP_COUNTER.with(|c| c.get()), 100);
+}
+
+#[bench]
+pub fn bench_noncopy(b: &mut Bencher) {
+    let arena = TypedArena::default();
+    b.iter(|| {
+        arena.alloc(Noncopy { string: "hello world".to_string(), array: vec![1, 2, 3, 4, 5] })
+    })
+}
+
+#[bench]
+pub fn bench_noncopy_nonarena(b: &mut Bencher) {
+    b.iter(|| {
+        let _: Box<_> =
+            Box::new(Noncopy { string: "hello world".to_string(), array: vec![1, 2, 3, 4, 5] });
+    })
+}