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annotate DPF-Prymula-audioplugins/dpf/distrho/extra/LeakDetector.hpp @ 3:84e66ea83026

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DPF-Prymula-audioplugins-0.231015-2
author prymula <prymula76@outlook.com>
date Mon, 16 Oct 2023 21:53:34 +0200
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1 /*
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2 * DISTRHO Plugin Framework (DPF)
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3 * Copyright (C) 2012-2016 Filipe Coelho <falktx@falktx.com>
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4 *
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5 * Permission to use, copy, modify, and/or distribute this software for any purpose with
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6 * or without fee is hereby granted, provided that the above copyright notice and this
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7 * permission notice appear in all copies.
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8 *
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9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
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10 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
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11 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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13 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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15 */
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16
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17 #ifndef DISTRHO_LEAK_DETECTOR_HPP_INCLUDED
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18 #define DISTRHO_LEAK_DETECTOR_HPP_INCLUDED
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19
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20 #include "../DistrhoUtils.hpp"
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21
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22 START_NAMESPACE_DISTRHO
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23
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24 // -----------------------------------------------------------------------
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25 // The following code was based from juce-core LeakDetector class
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26
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27 /**
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28 Copyright (C) 2013 Raw Material Software Ltd.
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29
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30 Permission is granted to use this software under the terms of the ISC license
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31 http://www.isc.org/downloads/software-support-policy/isc-license/
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32
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33 Permission to use, copy, modify, and/or distribute this software for any
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34 purpose with or without fee is hereby granted, provided that the above
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35 copyright notice and this permission notice appear in all copies.
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36
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37 THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH REGARD
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38 TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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39 FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,
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40 OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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41 USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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42 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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43 OF THIS SOFTWARE.
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44 */
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45
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46 /** A good old-fashioned C macro concatenation helper.
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47 This combines two items (which may themselves be macros) into a single string,
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48 avoiding the pitfalls of the ## macro operator.
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49 */
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50 #define DISTRHO_JOIN_MACRO_HELPER(a, b) a ## b
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51 #define DISTRHO_JOIN_MACRO(item1, item2) DISTRHO_JOIN_MACRO_HELPER(item1, item2)
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52
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53 #if defined(DEBUG) && !defined(NDEBUG)
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54 /** This macro lets you embed a leak-detecting object inside a class.\n
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55 To use it, simply declare a DISTRHO_LEAK_DETECTOR(YourClassName) inside a private section
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56 of the class declaration. E.g.
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57 \code
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58 class MyClass
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59 {
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60 public:
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61 MyClass();
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62 void blahBlah();
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63
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64 private:
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65 DISTRHO_LEAK_DETECTOR(MyClass)
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66 };
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67 \endcode
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68 */
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69 # define DISTRHO_LEAK_DETECTOR(ClassName) \
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70 friend class DISTRHO_NAMESPACE::LeakedObjectDetector<ClassName>; \
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71 static const char* getLeakedObjectClassName() noexcept { return #ClassName; } \
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72 DISTRHO_NAMESPACE::LeakedObjectDetector<ClassName> DISTRHO_JOIN_MACRO(leakDetector_, ClassName);
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73
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74 # define DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(ClassName) \
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75 DISTRHO_DECLARE_NON_COPYABLE(ClassName) \
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76 DISTRHO_LEAK_DETECTOR(ClassName)
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77 #else
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78 /** Don't use leak detection on release builds. */
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79 # define DISTRHO_LEAK_DETECTOR(ClassName)
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80 # define DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(ClassName) \
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81 DISTRHO_DECLARE_NON_COPYABLE(ClassName)
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82 #endif
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83
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84 //==============================================================================
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85 /**
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86 Embedding an instance of this class inside another class can be used as a low-overhead
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87 way of detecting leaked instances.
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88
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89 This class keeps an internal static count of the number of instances that are
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90 active, so that when the app is shutdown and the static destructors are called,
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91 it can check whether there are any left-over instances that may have been leaked.
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92
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93 To use it, use the DISTRHO_LEAK_DETECTOR macro as a simple way to put one in your
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94 class declaration.
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95 */
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96 template<class OwnerClass>
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97 class LeakedObjectDetector
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98 {
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99 public:
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100 //==============================================================================
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101 LeakedObjectDetector() noexcept { ++(getCounter().numObjects); }
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102 LeakedObjectDetector(const LeakedObjectDetector&) noexcept { ++(getCounter().numObjects); }
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103
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104 ~LeakedObjectDetector() noexcept
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105 {
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106 if (--(getCounter().numObjects) < 0)
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107 {
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108 /** If you hit this, then you've managed to delete more instances of this class than you've
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109 created.. That indicates that you're deleting some dangling pointers.
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110
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111 Note that although this assertion will have been triggered during a destructor, it might
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112 not be this particular deletion that's at fault - the incorrect one may have happened
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113 at an earlier point in the program, and simply not been detected until now.
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114
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115 Most errors like this are caused by using old-fashioned, non-RAII techniques for
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116 your object management. Tut, tut. Always, always use ScopedPointers, OwnedArrays,
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117 ReferenceCountedObjects, etc, and avoid the 'delete' operator at all costs!
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118 */
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119 d_stderr2("*** Dangling pointer deletion! Class: '%s', Count: %i", getLeakedObjectClassName(), getCounter().numObjects);
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120 }
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121 }
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122
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123 private:
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124 //==============================================================================
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125 class LeakCounter
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126 {
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127 public:
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128 LeakCounter() noexcept
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129 : numObjects(0) {}
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130
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131 ~LeakCounter() noexcept
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132 {
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133 if (numObjects > 0)
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134 {
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135 /** If you hit this, then you've leaked one or more objects of the type specified by
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136 the 'OwnerClass' template parameter - the name should have been printed by the line above.
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137
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138 If you're leaking, it's probably because you're using old-fashioned, non-RAII techniques for
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139 your object management. Tut, tut. Always, always use ScopedPointers, OwnedArrays,
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140 ReferenceCountedObjects, etc, and avoid the 'delete' operator at all costs!
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141 */
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142 d_stderr2("*** Leaked objects detected: %i instance(s) of class '%s'", numObjects, getLeakedObjectClassName());
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143 }
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144 }
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145
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146 // this should be an atomic...
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147 volatile int numObjects;
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148 };
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149
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150 static const char* getLeakedObjectClassName() noexcept
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151 {
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152 return OwnerClass::getLeakedObjectClassName();
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153 }
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154
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155 static LeakCounter& getCounter() noexcept
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156 {
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157 static LeakCounter counter;
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158 return counter;
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159 }
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160 };
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161
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162 // -----------------------------------------------------------------------
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163
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164 END_NAMESPACE_DISTRHO
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165
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166 #endif // DISTRHO_LEAK_DETECTOR_HPP_INCLUDED