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macro_rules! ffi_fn {
(fn $name:ident($($arg:ident: $arg_ty:ty),*,) -> $ret:ty $body:block) => {
ffi_fn!(fn $name($($arg: $arg_ty),*) -> $ret $body);
};
(fn $name:ident($($arg:ident: $arg_ty:ty),*) -> $ret:ty $body:block) => {
#[no_mangle]
pub extern fn $name($($arg: $arg_ty),*) -> $ret {
use ::std::io::{self, Write};
use ::std::panic::{self, AssertUnwindSafe};
use ::libc::abort;
match panic::catch_unwind(AssertUnwindSafe(move || $body)) {
Ok(v) => v,
Err(err) => {
let msg = if let Some(&s) = err.downcast_ref::<&str>() {
s.to_owned()
} else if let Some(s) = err.downcast_ref::<String>() {
s.to_owned()
} else {
"UNABLE TO SHOW RESULT OF PANIC.".to_owned()
};
let _ = writeln!(
&mut io::stderr(),
"panic unwind caught, aborting: {:?}",
msg);
unsafe { abort() }
}
}
}
};
(fn $name:ident($($arg:ident: $arg_ty:ty),*,) $body:block) => {
ffi_fn!(fn $name($($arg: $arg_ty),*) -> () $body);
};
(fn $name:ident($($arg:ident: $arg_ty:ty),*) $body:block) => {
ffi_fn!(fn $name($($arg: $arg_ty),*) -> () $body);
};
}