Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 53 insertions, 0 deletions

diff --git a/vendor/psm/examples/on_stack_fibo_alloc_each_frame.rs b/vendor/psm/examples/on_stack_fibo_alloc_each_frame.rs
new file mode 100644
index 000000000..9b9f834b3
--- /dev/null
+++ b/vendor/psm/examples/on_stack_fibo_alloc_each_frame.rs
@@ -0,0 +1,53 @@
+extern crate psm;
+
+psm::psm_stack_manipulation! {
+    yes {
+        use std::alloc;
+
+        const STACK_ALIGN: usize = 4096;
+        const FRAME_SIZE: usize = 4096;
+        const FIB_COUNTS: [(usize, u64); 3] = [
+            (8, 21),
+            (16, 987),
+            (24, 46368),
+        ];
+
+        #[inline(never)]
+        fn fib(n: usize) -> u64 {
+            unsafe {
+                let layout = alloc::Layout::from_size_align(FRAME_SIZE, STACK_ALIGN).unwrap();
+                let new_stack = alloc::alloc(layout);
+                assert!(!new_stack.is_null(), "allocations must succeed!");
+                let r = match n {
+                    0 => 0,
+                    1 => 1,
+                    _ => {
+                        psm::on_stack(new_stack, FRAME_SIZE, || {
+                            fib(n - 1) + fib(n - 2)
+                        })
+                    }
+                };
+                alloc::dealloc(new_stack, layout);
+                r
+            }
+        }
+
+        fn main() {
+            for &(n, expected) in FIB_COUNTS.iter() {
+                let res = fib(n);
+                assert_eq!(res, expected);
+                println!("fib({}) = {}", n, res);
+            }
+        }
+    }
+    no {
+        fn main() {
+            eprintln!("Stack manipulation not supported by this target");
+        }
+    }
+}
+
+#[test]
+fn run_example() {
+    main()
+}