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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),*) -> () $body);
};
}
macro_rules! non_null {
($ptr:ident, $eval:expr, $err:expr) => {{
debug_assert!(!$ptr.is_null(), "{:?} must not be null", stringify!($ptr));
if $ptr.is_null() {
return $err;
}
unsafe { $eval }
}};
(&*$ptr:ident ?= $err:expr) => {{
non_null!($ptr, &*$ptr, $err)
}};
(&mut *$ptr:ident ?= $err:expr) => {{
non_null!($ptr, &mut *$ptr, $err)
}};
(Box::from_raw($ptr:ident) ?= $err:expr) => {{
non_null!($ptr, Box::from_raw($ptr), $err)
}};
(Arc::from_raw($ptr:ident) ?= $err:expr) => {{
non_null!($ptr, Arc::from_raw($ptr), $err)
}};
}
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