1 files changed, 40 insertions, 0 deletions
diff --git a/third_party/rust/objc/src/message/apple/x86.rs b/third_party/rust/objc/src/message/apple/x86.rs
new file mode 100644
index 0000000000..93422de24b
--- /dev/null
+++ b/third_party/rust/objc/src/message/apple/x86.rs
@@ -0,0 +1,40 @@
+use std::any::{Any, TypeId};
+use std::mem;
+
+use runtime::Imp;
+
+extern {
+    fn objc_msgSend();
+    fn objc_msgSend_fpret();
+    fn objc_msgSend_stret();
+
+    fn objc_msgSendSuper();
+    fn objc_msgSendSuper_stret();
+}
+
+pub fn msg_send_fn<R: Any>() -> Imp {
+    // Structures 1 or 2 bytes in size are placed in EAX.
+    // Structures 4 or 8 bytes in size are placed in: EAX and EDX.
+    // Structures of other sizes are placed at the address supplied by the caller.
+    // <https://developer.apple.com/library/mac/documentation/DeveloperTools/Conceptual/LowLevelABI/130-IA-32_Function_Calling_Conventions/IA32.html>
+
+    let type_id = TypeId::of::<R>();
+    let size = mem::size_of::<R>();
+    if type_id == TypeId::of::<f32>() ||
+            type_id == TypeId::of::<f64>() {
+        objc_msgSend_fpret
+    } else if size == 0 || size == 1 || size == 2 || size == 4 || size == 8 {
+        objc_msgSend
+    } else {
+        objc_msgSend_stret
+    }
+}
+
+pub fn msg_send_super_fn<R: Any>() -> Imp {
+    let size = mem::size_of::<R>();
+    if size == 0 || size == 1 || size == 2 || size == 4 || size == 8 {
+        objc_msgSendSuper
+    } else {
+        objc_msgSendSuper_stret
+    }
+}