| /* |
| * Copyright (c) 2016, 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_LOGSTREAM_HPP |
| #define SHARE_VM_LOGGING_LOGSTREAM_HPP |
| |
| #include "logging/log.hpp" |
| #include "logging/logHandle.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "utilities/ostream.hpp" |
| |
| |
| class LogStream : public outputStream { |
| friend class LogStreamTest_TestLineBufferAllocation_test_vm_Test; // see test/native/logging/test_logStream.cpp |
| friend class LogStreamTest_TestLineBufferAllocationCap_test_vm_Test; // see test/native/logging/test_logStream.cpp |
| |
| // Helper class, maintains the line buffer. For small line lengths, |
| // we avoid malloc and use a fixed sized member char array. If LogStream |
| // is allocated on the stack, this means small lines are assembled |
| // directly on the stack. |
| class LineBuffer { |
| char _smallbuf[64]; |
| char* _buf; |
| size_t _cap; |
| size_t _pos; |
| void try_ensure_cap(size_t cap); |
| public: |
| LineBuffer(); |
| ~LineBuffer(); |
| const char* buffer() const { return _buf; } |
| void append(const char* s, size_t len); |
| void reset(); |
| }; |
| LineBuffer _current_line; |
| LogTargetHandle _log_handle; |
| |
| // Prevent operator new for LogStream. |
| static void* operator new (size_t); |
| static void* operator new[] (size_t); |
| |
| public: |
| // Constructor to support creation from a LogTarget instance. |
| // |
| // LogTarget(Debug, gc) log; |
| // LogStreamBase(log) stream; |
| template <LogLevelType level, LogTagType T0, LogTagType T1, LogTagType T2, LogTagType T3, LogTagType T4, LogTagType GuardTag> |
| LogStream(const LogTargetImpl<level, T0, T1, T2, T3, T4, GuardTag>& type_carrier) : |
| _log_handle(level, &LogTagSetMapping<T0, T1, T2, T3, T4>::tagset()) {} |
| |
| // Constructor to support creation from typed (likely NULL) pointer. Mostly used by the logging framework. |
| // |
| // LogStreamBase stream(log.debug()); |
| // or |
| // LogStreamBase stream((LogTargetImpl<level, T0, T1, T2, T3, T4, GuardTag>*)NULL); |
| template <LogLevelType level, LogTagType T0, LogTagType T1, LogTagType T2, LogTagType T3, LogTagType T4, LogTagType GuardTag> |
| LogStream(const LogTargetImpl<level, T0, T1, T2, T3, T4, GuardTag>* type_carrier) : |
| _log_handle(level, &LogTagSetMapping<T0, T1, T2, T3, T4>::tagset()) {} |
| |
| // Constructor to support creation from a LogTargetHandle. |
| // |
| // LogTarget(Debug, gc) log; |
| // LogTargetHandle(log) handle; |
| // LogStreamBase stream(handle); |
| LogStream(LogTargetHandle handle) : _log_handle(handle) {} |
| |
| // Constructor to support creation from a log level and tagset. |
| // |
| // LogStreamBase(level, tageset); |
| LogStream(LogLevelType level, LogTagSet* tagset) : _log_handle(level, tagset) {} |
| |
| void write(const char* s, size_t len); |
| }; |
| |
| // Support creation of a LogStream without having to provide a LogTarget pointer. |
| #define LogStreamHandle(level, ...) LogStreamTemplate<LogLevel::level, LOG_TAGS(__VA_ARGS__)> |
| |
| template <LogLevelType level, LogTagType T0, LogTagType T1, LogTagType T2, LogTagType T3, LogTagType T4, LogTagType GuardTag> |
| class LogStreamTemplate : public LogStream { |
| public: |
| LogStreamTemplate() : LogStream((LogTargetImpl<level, T0, T1, T2, T3, T4, GuardTag>*)NULL) {} |
| }; |
| |
| #endif // SHARE_VM_LOGGING_LOGSTREAM_HPP |