libobjc: header cleanup for new API (8)

["Nicola Pero" <nicola.pero@meta-innovation.com>]

> It also avoids having objc/objc.h include objc/message.h directly.  This had been done to
> provide the deprecated objc_msg_sendv() declarations (which was in objc/message.h before
> this patch) for the old API, but had the side effect of always defining struct objc_super
> in the old API way even if the new API is in use. :-(

This patch completes the previous one (number 4) and adds a testcase to make sure "struct
objc_super" is now declared in the right way in the new API (ie, that the fix in patch #4 worked).

Since I was writing a testcase, and I'm trying to make sure all functions in the new API
have a testcase each, I also added tests of objc_msg_lookup() and objc_msg_lookup_super().

Committed.

Thanks

Index: ChangeLog
===================================================================
--- ChangeLog   (revision 168051)
+++ ChangeLog   (working copy)
@@ -1,3 +1,8 @@
+2010-12-19  Nicola Pero  <nicola.pero@meta-innovation.com>
+
+       * objc.dg/gnu-api-2-objc_msg_lookup.m: New.
+       * obj-c++.dg/gnu-api-2-objc_msg_lookup.mm: New. 
+
 2010-12-19  Chung-Lin Tang  <cltang@codesourcery.com>
 
        * gcc.target/arm/vfp-1.c (test_ldst): New test for VFP
Index: objc.dg/gnu-api-2-objc_msg_lookup.m
===================================================================
--- objc.dg/gnu-api-2-objc_msg_lookup.m (revision 0)
+++ objc.dg/gnu-api-2-objc_msg_lookup.m (revision 0)
@@ -0,0 +1,77 @@
+/* Test the Modern GNU Objective-C Runtime API.
+
+   This is test 'objc_msg_lookup', covering objc_msg_lookup(),
+   objc_msg_lookup_super() and struct objc_super.  */
+
+/* { dg-do run } */
+/* { dg-skip-if "" { *-*-* } { "-fnext-runtime" } { "" } } */
+
+/* To get the modern GNU Objective-C Runtime API, you include
+   objc/runtime.h.  */
+#include <objc/runtime.h>
+
+/* For objc_msg_lookup(), objc_msg_lookup_super() and struct
+   objc_super.  */
+#include <objc/message.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+@interface MyRootClass
+{ Class isa; }
++ alloc;
+- init;
+- (int) test;
+@end
+
+@implementation MyRootClass
++ alloc { return class_createInstance (self, 0); }
+- init  { return self; }
+- (int) test { return 20; }
+@end
+
+@interface MySubClass : MyRootClass
+- (int) test;
+@end
+
+@implementation MySubClass
+- (int) test { return 11; }
+@end
+
+int main (int argc, void **args)
+{
+  /* Functions are tested in alphabetical order.  */
+
+  printf ("Testing objc_msg_lookup ()...\n");
+  {
+    MySubClass *object = [[MySubClass alloc] init];
+    int (* test_IMP) (id receiver, SEL selector);
+
+    test_IMP = (int (*)(id, SEL))objc_msg_lookup (object, @selector (test));    
+    
+    if (test_IMP (object, @selector (test)) != 11)
+      abort ();
+  }
+
+  printf ("Testing objc_msg_lookup_super ()...\n");
+  {
+    MySubClass *object = [[MySubClass alloc] init];
+    struct objc_super super = { 0, 0 };
+    int (* test_IMP) (id receiver, SEL selector);
+
+    /* Get the implementation of -test for the superclass of object -
+       as if we were calling [super test] inside a method
+       implementation of object.  */
+    super.self = object;
+    super.super_class = class_getSuperclass (object_getClass (object));
+    test_IMP = (int (*)(id, SEL))objc_msg_lookup_super (&super, @selector (test));
+
+    /* Invoke it.  The method in MyRootClass, not the one in
+       MySubClass, should be invoked.  */
+    if (test_IMP (object, @selector (test)) != 20)
+      abort ();
+  }
+
+  return 0;
+}
Index: obj-c++.dg/gnu-api-2-objc_msg_lookup.mm
===================================================================
--- obj-c++.dg/gnu-api-2-objc_msg_lookup.mm     (revision 0)
+++ obj-c++.dg/gnu-api-2-objc_msg_lookup.mm     (revision 0)
@@ -0,0 +1,77 @@
+/* Test the Modern GNU Objective-C Runtime API.
+
+   This is test 'objc_msg_lookup', covering objc_msg_lookup(),
+   objc_msg_lookup_super() and struct objc_super.  */
+
+/* { dg-do run } */
+/* { dg-skip-if "" { *-*-* } { "-fnext-runtime" } { "" } } */
+
+/* To get the modern GNU Objective-C Runtime API, you include
+   objc/runtime.h.  */
+#include <objc/runtime.h>
+
+/* For objc_msg_lookup(), objc_msg_lookup_super() and struct
+   objc_super.  */
+#include <objc/message.h>
+
+#include <stdlib.h>
+#include <iostream>
+#include <cstring>
+
+@interface MyRootClass
+{ Class isa; }
++ alloc;
+- init;
+- (int) test;
+@end
+
+@implementation MyRootClass
++ alloc { return class_createInstance (self, 0); }
+- init  { return self; }
+- (int) test { return 20; }
+@end
+
+@interface MySubClass : MyRootClass
+- (int) test;
+@end
+
+@implementation MySubClass
+- (int) test { return 11; }
+@end
+
+int main ()
+{
+  /* Functions are tested in alphabetical order.  */
+
+  std::cout << "Testing objc_msg_lookup () ...\n";
+  {
+    MySubClass *object = [[MySubClass alloc] init];
+    int (* test_IMP) (id receiver, SEL selector);
+
+    test_IMP = (int (*)(id, SEL))objc_msg_lookup (object, @selector (test));    
+    
+    if (test_IMP (object, @selector (test)) != 11)
+      abort ();
+  }
+
+  std::cout << "Testing objc_msg_lookup_super () ...\n";
+  {
+    MySubClass *object = [[MySubClass alloc] init];
+    struct objc_super super = { 0, 0 };
+    int (* test_IMP) (id receiver, SEL selector);
+
+    /* Get the implementation of -test for the superclass of object -
+       as if we were calling [super test] inside a method
+       implementation of object.  */
+    super.self = object;
+    super.super_class = class_getSuperclass (object_getClass (object));
+    test_IMP = (int (*)(id, SEL))objc_msg_lookup_super (&super, @selector (test));
+
+    /* Invoke it.  The method in MyRootClass, not the one in
+       MySubClass, should be invoked.  */
+    if (test_IMP (object, @selector (test)) != 20)
+      abort ();
+  }
+
+  return (0);
+}