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// Tests that C++ exceptions can unwind through Rust code, run destructors and
// are ignored by catch_unwind. Also tests that Rust panics can unwind through
// C++ code.
// For linking libstdc++ on MinGW
#![cfg_attr(all(windows, target_env = "gnu"), feature(static_nobundle))]
#![feature(unwind_attributes)]
use std::panic::{catch_unwind, AssertUnwindSafe};
struct DropCheck<'a>(&'a mut bool);
impl<'a> Drop for DropCheck<'a> {
fn drop(&mut self) {
println!("DropCheck::drop");
*self.0 = true;
}
}
extern "C" {
fn throw_cxx_exception();
#[unwind(allowed)]
fn cxx_catch_callback(cb: extern "C" fn(), ok: *mut bool);
}
#[no_mangle]
#[unwind(allowed)]
extern "C" fn rust_catch_callback(cb: extern "C" fn(), rust_ok: &mut bool) {
let _caught_unwind = catch_unwind(AssertUnwindSafe(|| {
let _drop = DropCheck(rust_ok);
cb();
unreachable!("should have unwound instead of returned");
}));
unreachable!("catch_unwind should not have caught foreign exception");
}
fn throw_rust_panic() {
#[unwind(allowed)]
extern "C" fn callback() {
println!("throwing rust panic");
panic!(1234i32);
}
let mut dropped = false;
let mut cxx_ok = false;
let caught_unwind = catch_unwind(AssertUnwindSafe(|| {
let _drop = DropCheck(&mut dropped);
unsafe {
cxx_catch_callback(callback, &mut cxx_ok);
}
unreachable!("should have unwound instead of returned");
}));
println!("caught rust panic");
assert!(dropped);
assert!(caught_unwind.is_err());
let panic_obj = caught_unwind.unwrap_err();
let panic_int = *panic_obj.downcast_ref::<i32>().unwrap();
assert_eq!(panic_int, 1234);
assert!(cxx_ok);
}
fn main() {
unsafe { throw_cxx_exception() };
throw_rust_panic();
}
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