Objective-C layer: Add objcl_class_superclass.

darcs-hash:31c261f7b04e09756c407599560a5ef5c3bc5856

3 files changed, 24 insertions, 0 deletions

diff --git a/Lisp/libobjcl.lisp b/Lisp/libobjcl.lisp
index 16a300f..19f5a29 100644
--- a/Lisp/libobjcl.lisp
+++ b/Lisp/libobjcl.lisp
@@ -52,6 +52,9 @@
 (defcfun ("objcl_class_name" %objcl-class-name) :string
   (class :pointer))
 
+(defcfun ("objcl_class_superclass" %objcl-class-superclass) :pointer
+  (obj :pointer))
+
 (defcfun ("objcl_find_selector" %objcl-find-selector) :pointer
   (selector-name :string))
 
@@ -577,6 +580,12 @@ separating parts by hyphens works nicely in all of the `:INVERT`,
   (find-objc-meta-class-by-name
    (%objcl-class-name (%objcl-object-get-class (pointer-to obj)))))
 
+(defun objcl-class-superclass (class)
+  (let ((superclass-ptr (%objcl-class-superclass (pointer-to class))))
+    (if superclass-ptr
+        (make-pointer-wrapper t :pointer superclass-ptr)
+        nil)))
+
 (defun objc-class-of (obj)
   (cond ((object-is-meta-class-p obj)
          (error "Tried to get the class of meta class ~S." obj))
diff --git a/Objective-C/libobjcl.h b/Objective-C/libobjcl.h
index 9008c9e..968cf14 100644
--- a/Objective-C/libobjcl.h
+++ b/Objective-C/libobjcl.h
@@ -71,6 +71,9 @@ objcl_query_arglist_info (void *receiver,
 const char *
 objcl_class_name (Class class);
 
+Class
+objcl_class_superclass (Class class);
+
 const char *
 objcl_selector_name (SEL selector);
 
diff --git a/Objective-C/libobjcl.m b/Objective-C/libobjcl.m
index 3fc2300..5161a52 100644
--- a/Objective-C/libobjcl.m
+++ b/Objective-C/libobjcl.m
@@ -20,6 +20,7 @@
 #import "libobjcl.h"
 #import "PyObjC/libffi_support.h"
 #import "PyObjC/objc_support.h"
+#import "PyObjC/objc-runtime-compat.h"
 
 #import <Foundation/Foundation.h>
 #include <stdarg.h>
@@ -207,6 +208,17 @@ objcl_class_name (Class class)
 }
 
 
+Class
+objcl_class_superclass (Class class)
+{
+#ifdef __NEXT_RUNTIME__
+  return class_getSuperclass (class);
+#else
+  return class_get_super_class (class);
+#endif
+}
+
+
 const char *
 objcl_selector_name (SEL selector)
 {