Class.h (isInterface): Move implementation from natClass.cc.

* java/lang/Class.h (isInterface): Move implementation from
	natClass.cc. Declare inline.
	(Class): Add default constructor.
	* java/lang/Object.h: Update comments.
	* java/lang/natClass.cc (initializeClass): Use _Jv_InitClass to
	initialize superclass, saving a call if super is already initialized.

From-SVN: r39091

libjava/java/lang/Class.h

@@ -174,7 +174,8 @@ public:
 
   jboolean isAssignableFrom (jclass cls);
   jboolean isInstance (jobject obj);
-  jboolean isInterface (void)
+
+  inline jboolean isInterface (void)
   {
     return (accflags & java::lang::reflect::Modifier::INTERFACE) != 0;
   }
@@ -196,16 +197,17 @@ public:
   // finalization
   void finalize ();
 
+  Class () {};
+
   // This constructor is used to create Class object for the primitive
-  // types.
-  Class (jobject cname, jbyte sig, jint len, jobject array_vtable) {
-    
+  // types. See prims.cc.
+  Class (jobject cname, jbyte sig, jint len, jobject array_vtable)
+  {    
     using namespace java::lang::reflect;
     _Jv_Utf8Const *_Jv_makeUtf8Const (char *s, int len);
 
-    // C++ ctors are fixing the vtbl in a way that doesn't fit Java.
-    // We can fix the C++ compiler, or we can hack our runtime. What's
-    // below fix the vtable so that it starts at -2.
+    // C++ ctors set the vtbl pointer to point at an offset inside the vtable
+    // object. That doesn't work for Java, so this hack adjusts it back.
     void *p =  ((void **)this)[0];
     ((void **)this)[0] = (void *)((char *)p-2*sizeof (void *));
 

libjava/java/lang/Object.h

@@ -16,15 +16,13 @@ details.  */
 #include <gcj/javaprims.h>
 
 // This class is mainly here as a kludge to get G++ to allocate two
-// extra entries in the vtable. We will use them to store data.  This
-// allows us to support the new C++ ABI.
-
+// extra entries in each vtable.
 struct _JvObjectPrefix
 {
 protected:
   // New ABI Compatibility Dummy, #1 and 2.
-  virtual void nacd_1 (void) {};
-  virtual void nacd_2 (void) {};
+  virtual void nacd_1 (void) {};  // This slot really contains the Class pointer.
+  virtual void nacd_2 (void) {};  // Actually the GC bitmap marking descriptor.
 };
 
 class java::lang::Object : public _JvObjectPrefix

libjava/java/lang/natClass.cc

@@ -732,7 +732,7 @@ java::lang::Class::initializeClass (void)
     {
       try
 	{
-	  superclass->initializeClass ();
+	  _Jv_InitClass (superclass);
 	}
       catch (java::lang::Throwable *except)
 	{