1 /*
   2  * Copyright (c) 2015, 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 #ifndef SHARE_VM_LOGGING_LOGTAGLEVELEXPRESSION_HPP
  25 #define SHARE_VM_LOGGING_LOGTAGLEVELEXPRESSION_HPP
  26 
  27 #include "logging/logConfiguration.hpp"
  28 #include "logging/logLevel.hpp"
  29 #include "logging/logTag.hpp"
  30 #include "memory/allocation.hpp"
  31 #include "utilities/debug.hpp"
  32 #include "utilities/globalDefinitions.hpp"
  33 
  34 class LogTagSet;
  35 
  36 // Class used to temporary encode a 'what'-expression during log configuration.
  37 // Consists of a combination of tags and levels, e.g. "tag1+tag2=level1,tag3*=level2".
  38 class LogTagLevelExpression : public StackObj {
  39  public:
  40   static const size_t MaxCombinations = 256;
  41 
  42  private:
  43   friend void LogConfiguration::configure_stdout(LogLevelType, int, ...);
  44 
  45   static const char* DefaultExpressionString;
  46 
  47   size_t        _ntags, _ncombinations;
  48   LogTagType    _tags[MaxCombinations][LogTag::MaxTags];
  49   LogLevelType  _level[MaxCombinations];
  50   bool          _allow_other_tags[MaxCombinations];
  51 
  52   void new_combination() {
  53     // Make sure either all tags are set or the last tag is __NO_TAG
  54     if (_ntags < LogTag::MaxTags) {
  55       _tags[_ncombinations][_ntags] = LogTag::__NO_TAG;
  56     }
  57 
  58     _ncombinations++;
  59     _ntags = 0;
  60   }
  61 
  62   bool add_tag(LogTagType tag) {
  63     assert(_ntags < LogTag::MaxTags, "Can't have more tags than MaxTags!");
  64     for (size_t i = 0; i < _ntags; i++) {
  65       if (_tags[_ncombinations][i] == tag) {
  66         return false;
  67       }
  68     }
  69     _tags[_ncombinations][_ntags++] = tag;
  70     return true;
  71   }
  72 
  73   void set_level(LogLevelType level) {
  74     _level[_ncombinations] = level;
  75   }
  76 
  77   void set_allow_other_tags() {
  78     _allow_other_tags[_ncombinations] = true;
  79   }
  80 
  81  public:
  82   LogTagLevelExpression() : _ntags(0), _ncombinations(0) {
  83     for (size_t combination = 0; combination < MaxCombinations; combination++) {
  84       _level[combination] = LogLevel::Invalid;
  85       _allow_other_tags[combination] = false;
  86       _tags[combination][0] = LogTag::__NO_TAG;
  87     }
  88   }
  89 
  90   bool parse(const char* str, outputStream* errstream = NULL);
  91   LogLevelType level_for(const LogTagSet& ts) const;
  92 
  93   // Verify the tagsets/selections mentioned in this expression.
  94   // Returns false if some invalid tagset was found. If given an outputstream,
  95   // this function will list all the invalid selections on the stream.
  96   bool verify_tagsets(outputStream* out = NULL) const;
  97 };
  98 
  99 #endif // SHARE_VM_LOGGING_LOGTAGLEVELEXPRESSION_HPP