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

[rustc.git] / src / tools / clippy / tests / ui / atomic_ordering_exchange_weak.rs

diff --git a/src/tools/clippy/tests/ui/atomic_ordering_exchange_weak.rs b/src/tools/clippy/tests/ui/atomic_ordering_exchange_weak.rs
new file mode 100644 (file)
index 0000000..5906990
--- /dev/null
+++ b/src/tools/clippy/tests/ui/atomic_ordering_exchange_weak.rs
@@ -0,0 +1,47 @@
+#![warn(clippy::invalid_atomic_ordering)]
+
+use std::sync::atomic::{AtomicPtr, Ordering};
+
+fn main() {
+    let ptr = &mut 5;
+    let ptr2 = &mut 10;
+    // `compare_exchange_weak` testing
+    let x = AtomicPtr::new(ptr);
+
+    // Allowed ordering combos
+    let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Relaxed, Ordering::Relaxed);
+    let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Acquire, Ordering::Acquire);
+    let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Acquire, Ordering::Relaxed);
+    let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Release, Ordering::Relaxed);
+    let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::AcqRel, Ordering::Acquire);
+    let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::AcqRel, Ordering::Relaxed);
+    let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::SeqCst, Ordering::Relaxed);
+    let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::SeqCst, Ordering::Acquire);
+    let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::SeqCst, Ordering::SeqCst);
+
+    // AcqRel is always forbidden as a failure ordering
+    let _ = x.compare_exchange_weak(ptr2, ptr, Ordering::Relaxed, Ordering::AcqRel);
+    let _ = x.compare_exchange_weak(ptr2, ptr, Ordering::Acquire, Ordering::AcqRel);
+    let _ = x.compare_exchange_weak(ptr2, ptr, Ordering::Release, Ordering::AcqRel);
+    let _ = x.compare_exchange_weak(ptr2, ptr, Ordering::AcqRel, Ordering::AcqRel);
+    let _ = x.compare_exchange_weak(ptr2, ptr, Ordering::SeqCst, Ordering::AcqRel);
+
+    // Release is always forbidden as a failure ordering
+    let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Relaxed, Ordering::Release);
+    let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Acquire, Ordering::Release);
+    let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Release, Ordering::Release);
+    let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::AcqRel, Ordering::Release);
+    let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::SeqCst, Ordering::Release);
+
+    // Release success order forbids failure order of Acquire or SeqCst
+    let _ = x.compare_exchange_weak(ptr2, ptr, Ordering::Release, Ordering::Acquire);
+    let _ = x.compare_exchange_weak(ptr2, ptr, Ordering::Release, Ordering::SeqCst);
+
+    // Relaxed success order also forbids failure order of Acquire or SeqCst
+    let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Relaxed, Ordering::SeqCst);
+    let _ = x.compare_exchange_weak(ptr, ptr2, Ordering::Relaxed, Ordering::Acquire);
+
+    // Acquire/AcqRel forbids failure order of SeqCst
+    let _ = x.compare_exchange_weak(ptr2, ptr, Ordering::Acquire, Ordering::SeqCst);
+    let _ = x.compare_exchange_weak(ptr2, ptr, Ordering::AcqRel, Ordering::SeqCst);
+}