1 files changed, 53 insertions, 0 deletions
diff --git a/third_party/rust/hyper/src/ffi/macros.rs b/third_party/rust/hyper/src/ffi/macros.rs
new file mode 100644
index 0000000000..022711baaa
--- /dev/null
+++ b/third_party/rust/hyper/src/ffi/macros.rs
@@ -0,0 +1,53 @@
+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)
+    }};
+}