60 lines
2.3 KiB
C++
60 lines
2.3 KiB
C++
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/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_LOGGING_LOGPREFIX_HPP
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#define SHARE_VM_LOGGING_LOGPREFIX_HPP
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#include "gc/shared/gcId.hpp"
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#include "logging/logTag.hpp"
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// Prefixes prepend each log message for a specified tagset with the given prefix.
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// A prefix consists of a format string and a value or callback. Prefixes are added
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// after the decorations but before the log message.
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//
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// List of prefixes for specific tags and/or tagsets.
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// Syntax: LOG_PREFIX(<printf format>, <value/callback for value>, LOG_TAGS(<chosen log tags>))
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#define LOG_PREFIX_LIST // Currently unused/empty
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// The empty prefix, used when there's no prefix defined.
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template <LogTagType T0, LogTagType T1, LogTagType T2, LogTagType T3, LogTagType T4, LogTagType GuardTag = LogTag::__NO_TAG>
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struct LogPrefix : public AllStatic {
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STATIC_ASSERT(GuardTag == LogTag::__NO_TAG);
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static size_t prefix(char* buf, size_t len) {
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return 0;
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}
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};
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#define LOG_PREFIX(fmt, fn, ...) \
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template <> struct LogPrefix<__VA_ARGS__> { \
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static size_t prefix(char* buf, size_t len) { \
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int ret = jio_snprintf(buf, len, fmt, fn); \
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assert(ret >= 0, \
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err_msg("Failed to prefix log message using prefix ('%s', '%s'), log buffer too small?", fmt, #fn)); \
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return ret; \
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} \
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};
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LOG_PREFIX_LIST
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#undef LOG_PREFIX
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#endif // SHARE_VM_LOGGING_LOGPREFIX_HPP
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