chore: checkpoint before Python removal

vendor/stacker/tests/simple.rs

@@ -0,0 +1,29 @@
+extern crate stacker;
+
+const RED_ZONE: usize = 100 * 1024; // 100k
+const STACK_PER_RECURSION: usize = 1 * 1024 * 1024; // 1MB
+
+pub fn ensure_sufficient_stack<R, F: FnOnce() -> R + std::panic::UnwindSafe>(f: F) -> R {
+    stacker::maybe_grow(RED_ZONE, STACK_PER_RECURSION, f)
+}
+
+#[inline(never)]
+fn recurse(n: usize) {
+    let x = [42u8; 50000];
+    if n != 0 {
+        ensure_sufficient_stack(|| recurse(n - 1));
+    }
+    #[allow(dropping_copy_types)]
+    drop(x);
+}
+
+#[test]
+#[cfg_attr(miri, ignore)] // Too slow under Miri's interpreter
+fn foo() {
+    let limit = if cfg!(target_arch = "wasm32") {
+        2000
+    } else {
+        10000
+    };
+    recurse(limit);
+}

vendor/stacker/tests/smoke.rs

@@ -0,0 +1,96 @@
+extern crate stacker;
+
+use std::sync::mpsc;
+use std::thread;
+
+#[inline(never)]
+fn __stacker_black_box(_: *const u8) {}
+
+#[test]
+fn deep() {
+    fn foo(n: usize, s: &mut [u8]) {
+        __stacker_black_box(s.as_ptr());
+        if n > 0 {
+            stacker::maybe_grow(64 * 1024, 1024 * 1024, || {
+                let mut s = [0u8; 1024];
+                foo(n - 1, &mut s);
+                __stacker_black_box(s.as_ptr());
+            })
+        } else {
+            println!("bottom");
+        }
+    }
+
+    let limit = if cfg!(target_arch = "wasm32") || cfg!(miri) {
+        2000
+    } else {
+        256 * 1024
+    };
+    foo(limit, &mut []);
+}
+
+#[test]
+#[cfg_attr(target_arch = "wasm32", ignore)]
+#[cfg_attr(miri, ignore)] // Too slow under Miri's interpreter
+fn panic() {
+    fn foo(n: usize, s: &mut [u8]) {
+        __stacker_black_box(s.as_ptr());
+        if n > 0 {
+            stacker::maybe_grow(64 * 1024, 1024 * 1024, || {
+                let mut s = [0u8; 1024];
+                foo(n - 1, &mut s);
+                __stacker_black_box(s.as_ptr());
+            })
+        } else {
+            panic!("bottom");
+        }
+    }
+
+    let (tx, rx) = mpsc::channel::<()>();
+    thread::spawn(move || {
+        foo(64 * 1024, &mut []);
+        drop(tx);
+    })
+    .join()
+    .unwrap_err();
+
+    assert!(rx.recv().is_err());
+}
+
+fn recursive<F: FnOnce()>(n: usize, f: F) -> usize {
+    if n > 0 {
+        stacker::grow(64 * 1024, || recursive(n - 1, f) + 1)
+    } else {
+        f();
+        0
+    }
+}
+
+#[test]
+#[cfg_attr(target_arch = "wasm32", ignore)]
+fn catch_panic() {
+    let panic_result = std::panic::catch_unwind(|| {
+        recursive(100, || panic!());
+    });
+    assert!(panic_result.is_err());
+}
+
+#[test]
+#[cfg_attr(target_arch = "wasm32", ignore)]
+fn catch_panic_inside() {
+    stacker::grow(64 * 1024, || {
+        let panic_result = std::panic::catch_unwind(|| {
+            recursive(100, || panic!());
+        });
+        assert!(panic_result.is_err());
+    });
+}
+
+#[test]
+#[cfg_attr(target_arch = "wasm32", ignore)]
+fn catch_panic_leaf() {
+    stacker::grow(64 * 1024, || {
+        let panic_result = std::panic::catch_unwind(|| panic!());
+        assert!(panic_result.is_err());
+    });
+}