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<a href="a00035.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> // RTTI support for -*- C++ -*-</div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> // Copyright (C) 1994-2018 Free Software Foundation, Inc.</div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> //</div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> // This file is part of GCC.</div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> //</div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> // GCC is free software; you can redistribute it and/or modify</div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> // it under the terms of the GNU General Public License as published by</div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> // the Free Software Foundation; either version 3, or (at your option)</div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> // any later version.</div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> //</div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> // GCC is distributed in the hope that it will be useful,</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> // but WITHOUT ANY WARRANTY; without even the implied warranty of</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> // GNU General Public License for more details.</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> //</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> // Under Section 7 of GPL version 3, you are granted additional</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> // permissions described in the GCC Runtime Library Exception, version</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> // 3.1, as published by the Free Software Foundation.</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> // You should have received a copy of the GNU General Public License and</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> // a copy of the GCC Runtime Library Exception along with this program;</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> // <http://www.gnu.org/licenses/>.</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> /** @file typeinfo</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  * This is a Standard C++ Library header.</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  */</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> #ifndef _TYPEINFO</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> #define _TYPEINFO</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> #pragma GCC system_header</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> #include <bits/exception.h></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> #if __cplusplus >= 201103L</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> #include <bits/hash_bytes.h></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> #endif</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> #pragma GCC visibility push(default)</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> extern "C++" {</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> namespace __cxxabiv1</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> {</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  class __class_type_info;</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> } // namespace __cxxabiv1</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> // Determine whether typeinfo names for the same type are merged (in which</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> // case comparison can just compare pointers) or not (in which case strings</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> // must be compared), and whether comparison is to be implemented inline or</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> // not. We used to do inline pointer comparison by default if weak symbols</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> // are available, but even with weak symbols sometimes names are not merged</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> // when objects are loaded with RTLD_LOCAL, so now we always use strcmp by</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> // default. For ABI compatibility, we do the strcmp inline if weak symbols</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> // are available, and out-of-line if not. Out-of-line pointer comparison</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> // is used where the object files are to be portable to multiple systems,</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> // some of which may not be able to use pointer comparison, but the</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> // particular system for which libstdc++ is being built can use pointer</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> // comparison; in particular for most ARM EABI systems, where the ABI</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> // specifies out-of-line comparison. The compiler's target configuration</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> // can override the defaults by defining __GXX_TYPEINFO_EQUALITY_INLINE to</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> // 1 or 0 to indicate whether or not comparison is inline, and</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> // __GXX_MERGED_TYPEINFO_NAMES to 1 or 0 to indicate whether or not pointer</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> // comparison can be used.</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> #ifndef __GXX_MERGED_TYPEINFO_NAMES</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> // By default, typeinfo names are not merged.</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> #define __GXX_MERGED_TYPEINFO_NAMES 0</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> #endif</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> // By default follow the old inline rules to avoid ABI changes.</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> #ifndef __GXX_TYPEINFO_EQUALITY_INLINE</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  #if !__GXX_WEAK__</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  #define __GXX_TYPEINFO_EQUALITY_INLINE 0</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  #else</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  #define __GXX_TYPEINFO_EQUALITY_INLINE 1</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  #endif</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> #endif</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> namespace std</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> {</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  /**</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  * @brief Part of RTTI.</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  *</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  * The @c type_info class describes type information generated by</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  * an implementation.</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  */</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  class type_info</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  {</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  public:</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  /** Destructor first. Being the first non-inline virtual function, this</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  * controls in which translation unit the vtable is emitted. The</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  * compiler makes use of that information to know where to emit</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  * the runtime-mandated type_info structures in the new-abi. */</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  virtual ~type_info();</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> </div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  /** Returns an @e implementation-defined byte string; this is not</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  * portable between compilers! */</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  const char* name() const _GLIBCXX_NOEXCEPT</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  { return __name[0] == '*' ? __name + 1 : __name; }</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> #if !__GXX_TYPEINFO_EQUALITY_INLINE</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  // In old abi, or when weak symbols are not supported, there can</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  // be multiple instances of a type_info object for one</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  // type. Uniqueness must use the _name value, not object address.</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  bool before(const type_info& __arg) const _GLIBCXX_NOEXCEPT;</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  bool operator==(const type_info& __arg) const _GLIBCXX_NOEXCEPT;</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> #else</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  #if !__GXX_MERGED_TYPEINFO_NAMES</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  /** Returns true if @c *this precedes @c __arg in the implementation's</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  * collation order. */</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  // Even with the new abi, on systems that support dlopen</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  // we can run into cases where type_info names aren't merged,</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  // so we still need to do string comparison.</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  bool before(const type_info& __arg) const _GLIBCXX_NOEXCEPT</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  { return (__name[0] == '*' && __arg.__name[0] == '*')</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  ? __name < __arg.__name</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  : __builtin_strcmp (__name, __arg.__name) < 0; }</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span> </div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  bool operator==(const type_info& __arg) const _GLIBCXX_NOEXCEPT</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  {</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  return ((__name == __arg.__name)</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  || (__name[0] != '*' &&</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  __builtin_strcmp (__name, __arg.__name) == 0));</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  }</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  #else</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  // On some targets we can rely on type_info's NTBS being unique,</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  // and therefore address comparisons are sufficient.</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  bool before(const type_info& __arg) const _GLIBCXX_NOEXCEPT</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  { return __name < __arg.__name; }</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  bool operator==(const type_info& __arg) const _GLIBCXX_NOEXCEPT</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  { return __name == __arg.__name; }</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  #endif</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> #endif</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  bool operator!=(const type_info& __arg) const _GLIBCXX_NOEXCEPT</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  { return !operator==(__arg); }</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> </div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> #if __cplusplus >= 201103L</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  size_t hash_code() const noexcept</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  {</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span> # if !__GXX_MERGED_TYPEINFO_NAMES</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  return _Hash_bytes(name(), __builtin_strlen(name()),</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  static_cast<size_t>(0xc70f6907UL));</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span> # else</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  return reinterpret_cast<size_t>(__name);</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> # endif</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  }</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span> #endif // C++11</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span> </div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  // Return true if this is a pointer type of some kind</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  virtual bool __is_pointer_p() const;</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span> </div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  // Return true if this is a function type</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  virtual bool __is_function_p() const;</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span> </div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  // Try and catch a thrown type. Store an adjusted pointer to the</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  // caught type in THR_OBJ. If THR_TYPE is not a pointer type, then</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  // THR_OBJ points to the thrown object. If THR_TYPE is a pointer</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  // type, then THR_OBJ is the pointer itself. OUTER indicates the</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  // number of outer pointers, and whether they were const</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  // qualified.</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  virtual bool __do_catch(const type_info *__thr_type, void **__thr_obj,</div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  unsigned __outer) const;</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span> </div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  // Internally used during catch matching</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  virtual bool __do_upcast(const __cxxabiv1::__class_type_info *__target,</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  void **__obj_ptr) const;</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span> </div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  protected:</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  const char *__name;</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span> </div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  explicit type_info(const char *__n): __name(__n) { }</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span> </div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  private:</div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  /// Assigning type_info is not supported.</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  type_info& operator=(const type_info&);</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  type_info(const type_info&);</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  };</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span> </div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  /**</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  * @brief Thrown during incorrect typecasting.</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  * @ingroup exceptions</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  *</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  * If you attempt an invalid @c dynamic_cast expression, an instance of</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  * this class (or something derived from this class) is thrown. */</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  class bad_cast : public exception</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  {</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  public:</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  bad_cast() _GLIBCXX_USE_NOEXCEPT { }</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span> </div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  // This declaration is not useless:</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  virtual ~bad_cast() _GLIBCXX_USE_NOEXCEPT;</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span> </div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  // See comment in eh_exception.cc.</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  virtual const char* what() const _GLIBCXX_USE_NOEXCEPT;</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  };</div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span> </div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  /**</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  * @brief Thrown when a NULL pointer in a @c typeid expression is used.</div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  * @ingroup exceptions</div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  */</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  class bad_typeid : public exception</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  {</div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  public:</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  bad_typeid () _GLIBCXX_USE_NOEXCEPT { }</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span> </div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  // This declaration is not useless:</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118</div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  virtual ~bad_typeid() _GLIBCXX_USE_NOEXCEPT;</div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span> </div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  // See comment in eh_exception.cc.</div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  virtual const char* what() const _GLIBCXX_USE_NOEXCEPT;</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  };</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span> } // namespace std</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span> </div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span> } // extern "C++"</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span> </div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span> #pragma GCC visibility pop</div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span> </div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span> #endif</div></div><!-- fragment --></div><!-- contents -->
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