/* 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, AssertUnwindSafe};

thread_local!(static PANIC_PAYLOAD: RefCell<Option<Box<dyn Any + Send>>> = RefCell::new(None));

/// If there is a pending panic, resume unwinding.

pub fn maybe_resume_unwind() {

    if let Some(error) = PANIC_PAYLOAD.with(|result| result.borrow_mut().take()) {

        resume_unwind(error);

    }

}

/// Generic wrapper for JS engine callbacks panic-catching

// https://github.com/servo/servo/issues/26585

#[inline(never)]

pub fn wrap_panic(function: &mut dyn FnMut()) {

    match catch_unwind(AssertUnwindSafe(function)) {

        Ok(()) => {}

        Err(payload) => {

            PANIC_PAYLOAD.with(|opt_payload| {

                let mut opt_payload = opt_payload.borrow_mut();

                assert!(opt_payload.is_none());

                *opt_payload = Some(payload);

            });

        }

    }

}