/*

 * 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_LOGPREFIX_HPP

#define SHARE_VM_LOGGING_LOGPREFIX_HPP

#include "gc/shared/gcId.hpp"

#include "logging/logTag.hpp"

// Prefixes prepend each log message for a specified tagset with the given prefix.

// A prefix consists of a format string and a value or callback. Prefixes are added

// after the decorations but before the log message.

//

// List of prefixes for specific tags and/or tagsets.

// Syntax: LOG_PREFIX(<printf format>, <value/callback for value>, LOG_TAGS(<chosen log tags>))

#define LOG_PREFIX_LIST // Currently unused/empty

// The empty prefix, used when there's no prefix defined.

template <LogTagType T0, LogTagType T1, LogTagType T2, LogTagType T3, LogTagType T4, LogTagType GuardTag = LogTag::__NO_TAG>

struct LogPrefix : public AllStatic {

  STATIC_ASSERT(GuardTag == LogTag::__NO_TAG);

  static size_t prefix(char* buf, size_t len) {

    return 0;

  }

};

#define LOG_PREFIX(fmt, fn, ...) \

template <> struct LogPrefix<__VA_ARGS__> { \

  static size_t prefix(char* buf, size_t len) { \

    int ret = jio_snprintf(buf, len, fmt, fn); \

    assert(ret >= 0, \

           err_msg("Failed to prefix log message using prefix ('%s', '%s'), log buffer too small?", fmt, #fn)); \

    return ret; \

  } \

};

LOG_PREFIX_LIST

#undef LOG_PREFIX

#endif // SHARE_VM_LOGGING_LOGPREFIX_HPP