1 files changed, 40 insertions, 0 deletions
diff --git a/third_party/rust/objc/src/message/apple/arm.rs b/third_party/rust/objc/src/message/apple/arm.rs
new file mode 100644
index 0000000000..d26defc0de
--- /dev/null
+++ b/third_party/rust/objc/src/message/apple/arm.rs
@@ -0,0 +1,40 @@
+use std::any::{Any, TypeId};
+use std::mem;
+
+use runtime::Imp;
+
+extern {
+    fn objc_msgSend();
+    fn objc_msgSend_stret();
+
+    fn objc_msgSendSuper();
+    fn objc_msgSendSuper_stret();
+}
+
+pub fn msg_send_fn<R: Any>() -> Imp {
+    // Double-word sized fundamental data types don't use stret,
+    // but any composite type larger than 4 bytes does.
+    // <http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042e/IHI0042E_aapcs.pdf>
+
+    let type_id = TypeId::of::<R>();
+    if mem::size_of::<R>() <= 4 ||
+            type_id == TypeId::of::<i64>() ||
+            type_id == TypeId::of::<u64>() ||
+            type_id == TypeId::of::<f64>() {
+        objc_msgSend
+    } else {
+        objc_msgSend_stret
+    }
+}
+
+pub fn msg_send_super_fn<R: Any>() -> Imp {
+    let type_id = TypeId::of::<R>();
+    if mem::size_of::<R>() <= 4 ||
+            type_id == TypeId::of::<i64>() ||
+            type_id == TypeId::of::<u64>() ||
+            type_id == TypeId::of::<f64>() {
+        objc_msgSendSuper
+    } else {
+        objc_msgSendSuper_stret
+    }
+}