src/hotspot/share/services/writeableFlags.hpp

/*
 * Copyright (c) 2015, 2021, 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_SERVICES_WRITEABLEFLAGS_HPP
#define SHARE_SERVICES_WRITEABLEFLAGS_HPP

#include "runtime/flags/jvmFlag.hpp"
#include "runtime/globals.hpp"
#include "utilities/formatBuffer.hpp"

class WriteableFlags : AllStatic {
private:
  // a writeable flag setter accepting either 'jvalue' or 'char *' values
  static JVMFlag::Error set_flag(const char* name, const void* value, JVMFlag::Error(*setter)(JVMFlag*, const void*, JVMFlagOrigin, FormatBuffer<80>&), JVMFlagOrigin origin, FormatBuffer<80>& err_msg);
  // a writeable flag setter accepting 'char *' values
  static JVMFlag::Error set_flag_from_char(JVMFlag* f, const void* value, JVMFlagOrigin origin, FormatBuffer<80>& err_msg);
  // a writeable flag setter accepting 'jvalue' values
  static JVMFlag::Error set_flag_from_jvalue(JVMFlag* f, const void* value, JVMFlagOrigin origin, FormatBuffer<80>& err_msg);

  static JVMFlag::Error set_bool_flag(const char* name, const char* value, JVMFlagOrigin origin, FormatBuffer<80>& err_msg);
  static JVMFlag::Error set_int_flag(const char* name, const char* value, JVMFlagOrigin origin, FormatBuffer<80>& err_msg);
  static JVMFlag::Error set_uint_flag(const char* name, const char* value, JVMFlagOrigin origin, FormatBuffer<80>& err_msg);
  static JVMFlag::Error set_intx_flag(const char* name, const char* value, JVMFlagOrigin origin, FormatBuffer<80>& err_msg);
  static JVMFlag::Error set_uintx_flag(const char* name, const char* value, JVMFlagOrigin origin, FormatBuffer<80>& err_msg);
  static JVMFlag::Error set_uint64_t_flag(const char* name, const char* value, JVMFlagOrigin origin, FormatBuffer<80>& err_msg);
  static JVMFlag::Error set_size_t_flag(const char* name, const char* value, JVMFlagOrigin origin, FormatBuffer<80>& err_msg);
  static JVMFlag::Error set_double_flag(const char* name, const char* value, JVMFlagOrigin origin, FormatBuffer<80>& err_msg);
  static JVMFlag::Error set_ccstr_flag(const char* name, const char* value, JVMFlagOrigin origin, FormatBuffer<80>& err_msg);

  template <typename T, int type_enum>
  static JVMFlag::Error set_flag_impl(const char* name, T value, JVMFlagOrigin 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 JVMFlag::Error set_flag(const char* flag_name, const char* flag_value, JVMFlagOrigin 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 JVMFlag::Error set_flag(const char* flag_name, jvalue flag_value, JVMFlagOrigin origin, FormatBuffer<80>& err_msg);
};

#endif // SHARE_SERVICES_WRITEABLEFLAGS_HPP