1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_LOGGING_LOGSTREAM_HPP 26 #define SHARE_VM_LOGGING_LOGSTREAM_HPP 27 28 #include "logging/log.hpp" 29 #include "logging/logHandle.hpp" 30 #include "memory/resourceArea.hpp" 31 #include "utilities/ostream.hpp" 32 33 34 class LogStream : public outputStream { 35 36 // Helper class, maintains the line buffer. For small line lengths, 37 // we avoid malloc and use a fixed sized member char array. If LogStream 38 // is allocated on the stack, this means small lines are assembled 39 // directly on the stack. 40 class LineBuffer { 41 char _smallbuf[128]; 42 char* _buf; 43 size_t _cap; 44 size_t _pos; 45 void ensure_cap(size_t cap); 46 public: 47 LineBuffer(); 48 ~LineBuffer(); 49 const char* ptr() const { return _buf; } 50 void append(const char* s, size_t len); 51 void reset(); 52 }; 53 LineBuffer _current_line; 54 LogTargetHandle _log_handle; 55 56 // Prevent operator new for LogStream. 57 // static void* operator new (size_t); 58 // static void* operator new[] (size_t); 59 60 public: 61 // Constructor to support creation from a LogTarget instance. 62 // 63 // LogTarget(Debug, gc) log; 64 // LogStreamBase(log) stream; 65 template <LogLevelType level, LogTagType T0, LogTagType T1, LogTagType T2, LogTagType T3, LogTagType T4, LogTagType GuardTag> 66 LogStream(const LogTargetImpl<level, T0, T1, T2, T3, T4, GuardTag>& type_carrier) : 67 _log_handle(level, &LogTagSetMapping<T0, T1, T2, T3, T4>::tagset()) {} 68 69 // Constructor to support creation from typed (likely NULL) pointer. Mostly used by the logging framework. 70 // 71 // LogStreamBase stream(log.debug()); 72 // or 73 // LogStreamBase stream((LogTargetImpl<level, T0, T1, T2, T3, T4, GuardTag>*)NULL); 74 template <LogLevelType level, LogTagType T0, LogTagType T1, LogTagType T2, LogTagType T3, LogTagType T4, LogTagType GuardTag> 75 LogStream(const LogTargetImpl<level, T0, T1, T2, T3, T4, GuardTag>* type_carrier) : 76 _log_handle(level, &LogTagSetMapping<T0, T1, T2, T3, T4>::tagset()) {} 77 78 // Constructor to support creation from a LogTargetHandle. 79 // 80 // LogTarget(Debug, gc) log; 81 // LogTargetHandle(log) handle; 82 // LogStreamBase stream(handle); 83 LogStream(LogTargetHandle handle) : _log_handle(handle) {} 84 85 // Constructor to support creation from a log level and tagset. 86 // 87 // LogStreamBase(level, tageset); 88 LogStream(LogLevelType level, LogTagSet* tagset) : _log_handle(level, tagset) {} 89 90 public: 91 void write(const char* s, size_t len); 92 }; 93 94 typedef LogStream LogStreamNoResourceMark; 95 typedef LogStream LogStreamCHeap; 96 97 // Support creation of a LogStream without having to provide a LogTarget pointer. 98 #define LogStreamHandle(level, ...) LogStreamTemplate<LogLevel::level, LOG_TAGS(__VA_ARGS__)> 99 100 template <LogLevelType level, LogTagType T0, LogTagType T1, LogTagType T2, LogTagType T3, LogTagType T4, LogTagType GuardTag> 101 class LogStreamTemplate : public LogStream { 102 public: 103 LogStreamTemplate() : LogStream((LogTargetImpl<level, T0, T1, T2, T3, T4, GuardTag>*)NULL) {} 104 }; 105 106 107 #endif // SHARE_VM_LOGGING_LOGSTREAM_HPP