Fix class_getMethodImplementation() semantics for Apple compatibility (returns forwarding selector IMP, doesn't actually do the forwarding).

runtime.c

@@ -344,21 +344,6 @@ const char *class_getIvarLayout(Class cls)
 	return (char*)cls->ivars;
 }
 
-IMP class_getMethodImplementation(Class cls, SEL name)
-{
-	CHECK_ARG(cls);
-	CHECK_ARG(name);
-	struct objc_object obj = { cls };
-	return (IMP)objc_msg_lookup((id)&obj, name);
-}
-
-IMP class_getMethodImplementation_stret(Class cls, SEL name)
-{
-	CHECK_ARG(cls);
-	CHECK_ARG(name);
-	struct objc_object obj = { cls };
-	return (IMP)objc_msg_lookup((id)&obj, name);
-}
 
 const char * class_getName(Class cls)
 {

sendmsg2.c

@@ -293,6 +293,19 @@ BOOL class_respondsToSelector(Class cls, SEL selector)
 	return NULL != objc_get_slot(cls, selector);
 }
 
+IMP class_getMethodImplementation(Class cls, SEL name)
+{
+	if ((cls = Nil) || (name == NULL)) { return (IMP)0; }
+	Slot_t slot = objc_get_slot(cls, name);
+	return NULL != slot ? slot->method : __objc_msg_forward2(nil, name);
+}
+
+IMP class_getMethodImplementation_stret(Class cls, SEL name)
+{
+	return class_getMethodImplementation(cls, name);
+}
+
+
 ////////////////////////////////////////////////////////////////////////////////
 // Legacy compatibility
 ////////////////////////////////////////////////////////////////////////////////
@@ -307,10 +320,8 @@ BOOL __objc_responds_to(id object, SEL sel)
 
 IMP get_imp(Class cls, SEL selector)
 {
-	Slot_t slot = objc_get_slot(cls, selector);
-	return NULL != slot ? slot->method : __objc_msg_forward2(nil, selector);
+	return class_getMethodImplementation(cls, selector);
 }
-
 /**
  * Legacy message lookup function.  Does not support fast proxies or safe IMP
  * caching.