--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/services/writeableFlags.hpp	Tue Dec 02 19:47:45 2014 +0100
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2015, 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.
+ *
+ */
+
+#ifndef SHARE_VM_SERVICES_WRITEABLEFLAG_HPP
+#define SHARE_VM_SERVICES_WRITEABLEFLAG_HPP
+
+class WriteableFlags : AllStatic {
+public:
+  enum error {
+    // no error
+    SUCCESS,
+    // flag name is missing
+    MISSING_NAME,
+    // flag value is missing
+    MISSING_VALUE,
+    // error parsing the textual form of the value
+    WRONG_FORMAT,
+    // flag is not writeable
+    NON_WRITABLE,
+    // flag value is outside of its bounds
+    OUT_OF_BOUNDS,
+    // there is no flag with the given name
+    INVALID_FLAG,
+    // other, unspecified error related to setting the flag
+    ERR_OTHER
+  } err;
+
+private:
+  // a writeable flag setter accepting either 'jvalue' or 'char *' values
+  static int set_flag(const char* name, const void* value, int(*setter)(Flag*, const void*, Flag::Flags, FormatBuffer<80>&), Flag::Flags origin, FormatBuffer<80>& err_msg);
+  // a writeable flag setter accepting 'char *' values
+  static int set_flag_from_char(Flag* f, const void* value, Flag::Flags origin, FormatBuffer<80>& err_msg);
+  // a writeable flag setter accepting 'jvalue' values
+  static int set_flag_from_jvalue(Flag* f, const void* value, Flag::Flags origin, FormatBuffer<80>& err_msg);
+
+  // set a boolean global flag
+  static int set_bool_flag(const char* name, const char* value, Flag::Flags origin, FormatBuffer<80>& err_msg);
+  // set a intx global flag
+  static int set_intx_flag(const char* name, const char* value, Flag::Flags origin, FormatBuffer<80>& err_msg);
+  // set a uintx global flag
+  static int set_uintx_flag(const char* name, const char* value, Flag::Flags origin, FormatBuffer<80>& err_msg);
+  // set a uint64_t global flag
+  static int set_uint64_t_flag(const char* name, const char* value, Flag::Flags origin, FormatBuffer<80>& err_msg);
+  // set a size_t global flag using value from AttachOperation
+  static int set_size_t_flag(const char* name, const char* value, Flag::Flags origin, FormatBuffer<80>& err_msg);
+  // set a boolean global flag
+  static int set_bool_flag(const char* name, bool value, Flag::Flags origin, FormatBuffer<80>& err_msg);
+  // set a intx global flag
+  static int set_intx_flag(const char* name, intx value, Flag::Flags origin, FormatBuffer<80>& err_msg);
+  // set a uintx global flag
+  static int set_uintx_flag(const char* name, uintx value, Flag::Flags origin, FormatBuffer<80>& err_msg);
+  // set a uint64_t global flag
+  static int set_uint64_t_flag(const char* name, uint64_t value, Flag::Flags origin, FormatBuffer<80>& err_msg);
+  // set a size_t global flag using value from AttachOperation
+  static int set_size_t_flag(const char* name, size_t value, Flag::Flags origin, FormatBuffer<80>& err_msg);
+  // set a string global flag
+  static int set_ccstr_flag(const char* name, const char* value, Flag::Flags origin, FormatBuffer<80>& err_msg);
+
+public:
+  /* sets a writeable flag to the provided value
+   *
+   * - return status is one of the WriteableFlags::err enum values
+   * - an eventual error message will be generated to the provided err_msg buffer
+   */
+  static int set_flag(const char* flag_name, const char* flag_value, Flag::Flags origin, FormatBuffer<80>& err_msg);
+
+  /* sets a writeable flag to the provided value
+   *
+   * - return status is one of the WriteableFlags::err enum values
+   * - an eventual error message will be generated to the provided err_msg buffer
+   */
+  static int set_flag(const char* flag_name, jvalue flag_value, Flag::Flags origin, FormatBuffer<80>& err_msg);
+};
+
+#endif /* SHARE_VM_SERVICES_WRITEABLEFLAG_HPP */
+