diff -r e9b91fd07263 -r 3b688d6ff3d0 src/share/vm/services/diagnosticCommand.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/services/diagnosticCommand.cpp	Wed Dec 14 04:30:57 2011 -0800
@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "services/diagnosticArgument.hpp"
+#include "services/diagnosticCommand.hpp"
+#include "services/diagnosticFramework.hpp"
+
+HelpDCmd::HelpDCmd(outputStream* output, bool heap) : DCmd(output, heap),
+  _all("-all", "Show help for all commands", "BOOLEAN", false, "false"),
+  _cmd("command name", "The name of the command for which we want help",
+        "STRING", false) {
+  _dcmdparser.add_dcmd_option(&_all);
+  _dcmdparser.add_dcmd_argument(&_cmd);
+};
+
+void HelpDCmd::parse(CmdLine* line, char delim, TRAPS) {
+  _dcmdparser.parse(line, delim, CHECK);
+}
+
+void HelpDCmd::print_help(outputStream* out) {
+  _dcmdparser.print_help(out, name());
+}
+
+void HelpDCmd::execute(TRAPS) {
+  if (_all.value()) {
+    GrowableArray<const char*>* cmd_list = DCmdFactory::DCmd_list();
+    for (int i = 0; i < cmd_list->length(); i++) {
+      DCmdFactory* factory = DCmdFactory::factory(cmd_list->at(i),
+                                                  strlen(cmd_list->at(i)));
+      if (!factory->is_hidden()) {
+        output()->print_cr("%s%s", factory->name(),
+                           factory->is_enabled() ? "" : " [disabled]");
+        output()->print_cr("\t%s", factory->description());
+        output()->cr();
+      }
+      factory = factory->next();
+    }
+  } else if (_cmd.has_value()) {
+    DCmd* cmd = NULL;
+    DCmdFactory* factory = DCmdFactory::factory(_cmd.value(),
+                                                strlen(_cmd.value()));
+    if (factory != NULL) {
+      output()->print_cr("%s%s", factory->name(),
+                         factory->is_enabled() ? "" : " [disabled]");
+      output()->print_cr(factory->description());
+      output()->print_cr("\nImpact: %s", factory->impact());
+      cmd = factory->create_resource_instance(output());
+      if (cmd != NULL) {
+        DCmdMark mark(cmd);
+        cmd->print_help(output());
+      }
+    } else {
+      output()->print_cr("Help unavailable : '%s' : No such command", _cmd.value());
+    }
+  } else {
+    output()->print_cr("The following commands are available:");
+    GrowableArray<const char *>* cmd_list = DCmdFactory::DCmd_list();
+    for (int i = 0; i < cmd_list->length(); i++) {
+      DCmdFactory* factory = DCmdFactory::factory(cmd_list->at(i),
+                                                  strlen(cmd_list->at(i)));
+      if (!factory->is_hidden()) {
+        output()->print_cr("%s%s", factory->name(),
+                           factory->is_enabled() ? "" : " [disabled]");
+      }
+      factory = factory->_next;
+    }
+    output()->print_cr("\nFor more information about a specific command use 'help <command>'.");
+  }
+}
+
+void HelpDCmd::reset(TRAPS) {
+  _dcmdparser.reset(CHECK);
+}
+
+void HelpDCmd::cleanup() {
+  _dcmdparser.cleanup();
+}
+
+int HelpDCmd::num_arguments() {
+  ResourceMark rm;
+  HelpDCmd* dcmd = new HelpDCmd(NULL, false);
+  if (dcmd != NULL) {
+    DCmdMark mark(dcmd);
+    return dcmd->_dcmdparser.num_arguments();
+  } else {
+    return 0;
+  }
+}
+
+GrowableArray<const char*>* HelpDCmd::argument_name_array() {
+  return _dcmdparser.argument_name_array();
+}
+
+GrowableArray<DCmdArgumentInfo*>* HelpDCmd::argument_info_array() {
+  return _dcmdparser.argument_info_array();
+}
+
+void VersionDCmd::execute(TRAPS) {
+  output()->print_cr("%s version %s", Abstract_VM_Version::vm_name(),
+          Abstract_VM_Version::vm_release());
+  JDK_Version jdk_version = JDK_Version::current();
+  if (jdk_version.update_version() > 0) {
+    output()->print_cr("JDK %d.%d_%02d", jdk_version.major_version(),
+            jdk_version.minor_version(), jdk_version.update_version());
+  } else {
+    output()->print_cr("JDK %d.%d", jdk_version.major_version(),
+            jdk_version.minor_version());
+  }
+}