/*

 * 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_LOGGING_LOGTAG_HPP

#define SHARE_VM_LOGGING_LOGTAG_HPP

#include "memory/allocation.hpp"

#include "utilities/globalDefinitions.hpp"

// List of available logging tags. New tags should be added here.

// (The tags 'all', 'disable' and 'help' are special tags that can

// not be used in log calls, and should not be listed below.)

#define LOG_TAG_LIST \

  LOG_TAG(logging)

#define PREFIX_LOG_TAG(T) (LogTag::T)

// Expand a set of log tags to their prefixed names.

// For error detection purposes, the macro passes one more tag than what is supported.

// If too many tags are given, a static assert in the log class will fail.

#define LOG_TAGS_EXPANDED(T0, T1, T2, T3, T4, T5, ...)  PREFIX_LOG_TAG(T0), PREFIX_LOG_TAG(T1), PREFIX_LOG_TAG(T2), \

                                                        PREFIX_LOG_TAG(T3), PREFIX_LOG_TAG(T4), PREFIX_LOG_TAG(T5)

// The EXPAND_VARARGS macro is required for MSVC, or it will resolve the LOG_TAGS_EXPANDED macro incorrectly.

#define EXPAND_VARARGS(x) x

#define LOG_TAGS(...) EXPAND_VARARGS(LOG_TAGS_EXPANDED(__VA_ARGS__, __NO_TAG, __NO_TAG, __NO_TAG, __NO_TAG, __NO_TAG, __NO_TAG))

// Log tags are used to classify log messages.

// Each log message can be assigned between 1 to LogTag::MaxTags number of tags.

// Specifying multiple tags for a log message means that only outputs configured

// for those exact tags, or a subset of the tags with a wildcard, will see the logging.

// Multiple tags should be comma separated, e.g. log_error(tag1, tag2)("msg").

class LogTag : public AllStatic {

 public:

  // The maximum number of tags that a single log message can have.

  // E.g. there might be hundreds of different tags available,

  // but a specific log message can only be tagged with up to MaxTags of those.

  static const size_t MaxTags = 5;

  enum type {

    __NO_TAG,

#define LOG_TAG(name) name,

    LOG_TAG_LIST

#undef LOG_TAG

    Count

  };

  static const char* name(LogTag::type tag) {

    return _name[tag];

  }

  static LogTag::type from_string(const char *str);

 private:

  static const char* _name[];

};

typedef LogTag::type LogTagType;

#endif // SHARE_VM_LOGGING_LOGTAG_HPP