895e4cf3fb
Make C API functions that return pointers return null in case of a panic, instead of aborting. Add ffi_fn! macro rules that enable default error values to be returned by writing "?= <value>" after an ffi function's body.
32 lines
1.1 KiB
Rust
32 lines
1.1 KiB
Rust
macro_rules! ffi_fn {
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($(#[$doc:meta])* fn $name:ident($($arg:ident: $arg_ty:ty),*) -> $ret:ty $body:block ?= $default:expr) => {
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$(#[$doc])*
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#[no_mangle]
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pub extern fn $name($($arg: $arg_ty),*) -> $ret {
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use std::panic::{self, AssertUnwindSafe};
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match panic::catch_unwind(AssertUnwindSafe(move || $body)) {
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Ok(v) => v,
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Err(_) => {
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$default
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}
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}
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}
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};
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($(#[$doc:meta])* fn $name:ident($($arg:ident: $arg_ty:ty),*) -> $ret:ty $body:block) => {
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ffi_fn!($(#[$doc])* fn $name($($arg: $arg_ty),*) -> $ret $body ?= {
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eprintln!("panic unwind caught, aborting");
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std::process::abort()
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});
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};
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($(#[$doc:meta])* fn $name:ident($($arg:ident: $arg_ty:ty),*) $body:block ?= $default:expr) => {
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ffi_fn!($(#[$doc])* fn $name($($arg: $arg_ty),*) -> () $body ?= $default);
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};
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($(#[$doc:meta])* fn $name:ident($($arg:ident: $arg_ty:ty),*) $body:block) => {
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ffi_fn!($(#[$doc])* fn $name($($arg: $arg_ty),*) -> () $body);
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};
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}
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