macro_rules! ffi_fn {
($(#[$doc:meta])* fn $name:ident($($arg:ident: $arg_ty:ty),*) -> $ret:ty $body:block ?= $default:expr) => {
$(#[$doc])*
#[no_mangle]
pub extern fn $name($($arg: $arg_ty),*) -> $ret {
use std::panic::{self, AssertUnwindSafe};
match panic::catch_unwind(AssertUnwindSafe(move || $body)) {
Ok(v) => v,
Err(_) => {
$default
}
}
}
};
($(#[$doc:meta])* fn $name:ident($($arg:ident: $arg_ty:ty),*) -> $ret:ty $body:block) => {
ffi_fn!($(#[$doc])* fn $name($($arg: $arg_ty),*) -> $ret $body ?= {
eprintln!("panic unwind caught, aborting");
std::process::abort()
});
};
($(#[$doc:meta])* fn $name:ident($($arg:ident: $arg_ty:ty),*) $body:block ?= $default:expr) => {
ffi_fn!($(#[$doc])* fn $name($($arg: $arg_ty),*) -> () $body ?= $default);
};
($(#[$doc:meta])* fn $name:ident($($arg:ident: $arg_ty:ty),*) $body:block) => {
ffi_fn!($(#[$doc])* fn $name($($arg: $arg_ty),*) -> () $body);
};
}