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
34class 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".
38class LogTagLevelExpression : public StackObj {
39 public:
40  static const size_t MaxCombinations = 256;
41
42 private:
43  friend void LogConfiguration::configure_stdout(LogLevelType, bool, ...);
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
100