Add procs_darwin.odin

core/runtime/procs_darwin.odin

@@ -0,0 +1,20 @@
+//+private
+package runtime
+
+foreign import "system:Foundation.framework"
+
+import "core:intrinsics"
+
+objc_id :: ^intrinsics.objc_object
+objc_Class :: ^intrinsics.objc_class
+objc_SEL :: ^intrinsics.objc_selector
+
+foreign Foundation {
+	objc_lookUpClass :: proc "c" (name: cstring) -> objc_Class ---
+	sel_registerName :: proc "c" (name: cstring) -> objc_SEL ---
+
+	objc_msgSend        :: proc "c" (self: objc_id, op: objc_SEL, #c_vararg args: ..any) ---
+	objc_msgSend_fpret  :: proc "c" (self: objc_id, op: objc_SEL, #c_vararg args: ..any) -> f64 ---
+	objc_msgSend_fp2ret :: proc "c" (self: objc_id, op: objc_SEL, #c_vararg args: ..any) -> complex128 ---
+	objc_msgSend_stret  :: proc "c" (self: objc_id, op: objc_SEL, #c_vararg args: ..any) ---
+}