--- a/src/share/vm/services/diagnosticFramework.hpp	Thu Jan 05 17:16:13 2012 -0500
+++ b/src/share/vm/services/diagnosticFramework.hpp	Mon Jan 09 10:27:24 2012 +0100
@@ -241,8 +241,17 @@
   static int num_arguments() { return 0; }
   outputStream* output() { return _output; }
   bool is_heap_allocated()  { return _is_heap_allocated; }
-  virtual void print_help(outputStream* out) { };
-  virtual void parse(CmdLine* line, char delim, TRAPS) { }
+  virtual void print_help(const char* name) {
+    output()->print_cr("Syntax: %s", name);
+  }
+  virtual void parse(CmdLine* line, char delim, TRAPS) {
+    DCmdArgIter iter(line->args_addr(), line->args_len(), delim);
+    bool has_arg = iter.next(CHECK);
+    if (has_arg) {
+      THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
+                "Unknown argument in diagnostic command");
+    }
+  }
   virtual void execute(TRAPS) { }
   virtual void reset(TRAPS) { }
   virtual void cleanup() { }
@@ -262,6 +271,25 @@
                                 char delim, TRAPS);
 };
 
+class DCmdWithParser : public DCmd {
+protected:
+  DCmdParser _dcmdparser;
+public:
+  DCmdWithParser (outputStream *output, bool heap=false) : DCmd(output, heap) { }
+  static const char* name() { return "No Name";}
+  static const char* description() { return "No Help";}
+  static const char* disabled_message() { return "Diagnostic command currently disabled"; }
+  static const char* impact() { return "Low: No impact"; }
+  static int num_arguments() { return 0; }
+  virtual void parse(CmdLine *line, char delim, TRAPS);
+  virtual void execute(TRAPS) { }
+  virtual void reset(TRAPS);
+  virtual void cleanup();
+  virtual void print_help(const char* name);
+  virtual GrowableArray<const char*>* argument_name_array();
+  virtual GrowableArray<DCmdArgumentInfo*>* argument_info_array();
+};
+
 class DCmdMark : public StackObj {
   DCmd* _ref;
 public: