mirror of https://github.com/rust-lang/rust.git
58 lines
1.5 KiB
Rust
58 lines
1.5 KiB
Rust
// Tests that C++ exceptions can unwind through Rust code run destructors and
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// are caught by catch_unwind. Also tests that Rust panics can unwind through
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// C++ code.
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use std::panic::{catch_unwind, AssertUnwindSafe};
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struct DropCheck<'a>(&'a mut bool);
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impl<'a> Drop for DropCheck<'a> {
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fn drop(&mut self) {
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println!("DropCheck::drop");
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*self.0 = true;
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}
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}
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extern "C" {
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fn test_cxx_exception();
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}
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extern "C-unwind" {
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fn cxx_catch_callback(cb: extern "C-unwind" fn(), ok: *mut bool);
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}
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#[no_mangle]
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extern "C-unwind" fn rust_catch_callback(cb: extern "C-unwind" fn(), rust_ok: &mut bool) {
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let _drop = DropCheck(rust_ok);
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cb();
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unreachable!("should have unwound instead of returned");
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}
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fn test_rust_panic() {
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extern "C-unwind" fn callback() {
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println!("throwing rust panic");
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panic!(1234i32);
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}
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let mut dropped = false;
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let mut cxx_ok = false;
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let caught_unwind = catch_unwind(AssertUnwindSafe(|| {
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let _drop = DropCheck(&mut dropped);
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unsafe {
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cxx_catch_callback(callback, &mut cxx_ok);
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}
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unreachable!("should have unwound instead of returned");
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}));
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println!("caught rust panic");
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assert!(dropped);
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assert!(caught_unwind.is_err());
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let panic_obj = caught_unwind.unwrap_err();
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let panic_int = *panic_obj.downcast_ref::<i32>().unwrap();
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assert_eq!(panic_int, 1234);
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assert!(cxx_ok);
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}
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fn main() {
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unsafe { test_cxx_exception() };
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test_rust_panic();
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}
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