1 files changed, 34 insertions, 0 deletions
diff --git a/js/rust/src/panic.rs b/js/rust/src/panic.rs
new file mode 100644
index 0000000000..496ed9b33d
--- /dev/null
+++ b/js/rust/src/panic.rs
@@ -0,0 +1,34 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use std::any::Any;
+use std::cell::RefCell;
+use std::panic::{catch_unwind, resume_unwind, UnwindSafe};
+
+thread_local!(static PANIC_RESULT: RefCell<Option<Box<Any + Send>>> = RefCell::new(None));
+
+/// If there is a pending panic, resume unwinding.
+pub fn maybe_resume_unwind() {
+    if let Some(error) = PANIC_RESULT.with(|result| result.borrow_mut().take()) {
+        resume_unwind(error);
+    }
+}
+
+/// Generic wrapper for JS engine callbacks panic-catching
+pub fn wrap_panic<F, R>(function: F, generic_return_type: R) -> R
+where
+    F: FnOnce() -> R + UnwindSafe,
+{
+    let result = catch_unwind(function);
+    match result {
+        Ok(result) => result,
+        Err(error) => {
+            PANIC_RESULT.with(|result| {
+                assert!(result.borrow().is_none());
+                *result.borrow_mut() = Some(error);
+            });
+            generic_return_type
+        }
+    }
+}