Mercurial > octave
annotate liboctave/util/oct-shlib.h @ 28899:02f0649f43d7 stable
Avoid deleting objects that live on the stack.
* ov.h (~octave_value, make_unique, operator =),
idx-vector.h (~idx_vector, operator =),
oct-shlib.h (~dynamic_library, operator =): Avoid calling `delete` on objects
that are not allocated with `new`. (Code marked as "Bad free" by clang static
analyzer.)
author | Markus Mützel <markus.muetzel@gmx.de> |
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date | Tue, 13 Oct 2020 19:02:46 +0200 |
parents | b3701ea5a48d |
children | 6b3faa844395 0a5b15007766 |
rev | line source |
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1 //////////////////////////////////////////////////////////////////////// |
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2 // |
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3 // Copyright (C) 1999-2020 The Octave Project Developers |
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4 // |
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5 // See the file COPYRIGHT.md in the top-level directory of this |
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6 // distribution or <https://octave.org/copyright/>. |
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7 // |
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8 // This file is part of Octave. |
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9 // |
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10 // Octave is free software: you can redistribute it and/or modify it |
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11 // under the terms of the GNU General Public License as published by |
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12 // the Free Software Foundation, either version 3 of the License, or |
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13 // (at your option) any later version. |
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14 // |
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15 // Octave is distributed in the hope that it will be useful, but |
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 // GNU General Public License for more details. |
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19 // |
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20 // You should have received a copy of the GNU General Public License |
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21 // along with Octave; see the file COPYING. If not, see |
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22 // <https://www.gnu.org/licenses/>. |
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23 // |
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24 //////////////////////////////////////////////////////////////////////// |
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26 #if ! defined (octave_oct_shlib_h) |
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27 #define octave_oct_shlib_h 1 |
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29 #include "octave-config.h" |
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30 |
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31 #include <functional> |
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32 #include <list> |
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33 #include <map> |
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35 | |
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37 #include "oct-refcount.h" |
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39 namespace octave |
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41 class |
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42 OCTAVE_API |
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43 dynamic_library |
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44 { |
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45 public: // FIXME: make this class private? |
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47 typedef std::function<std::string (const std::string&)> name_mangler; |
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49 class dynlib_rep |
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50 { |
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51 public: |
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52 |
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53 dynlib_rep (void) |
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54 : m_count (1), m_fcn_names (), m_file (), m_time_loaded (time_t ()), |
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55 m_search_all_loaded (false) |
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56 { } |
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57 |
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58 protected: |
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59 |
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60 dynlib_rep (const std::string& f); |
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61 |
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62 public: |
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63 |
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64 virtual ~dynlib_rep (void) |
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65 { |
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66 s_instances.erase (m_file); |
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67 } |
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68 |
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69 virtual bool is_open (void) const |
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70 { return false; } |
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71 |
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72 virtual void * search (const std::string&, |
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73 const name_mangler& = name_mangler ()) |
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74 { return nullptr; } |
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75 |
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76 bool is_out_of_date (void) const; |
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77 |
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78 // This method will be overridden conditionally. |
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79 static dynlib_rep * new_instance (const std::string& f); |
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81 static dynlib_rep * get_instance (const std::string& f, bool fake); |
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82 |
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83 sys::time time_loaded (void) const |
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84 { return m_time_loaded; } |
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85 |
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86 std::string file_name (void) const |
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87 { return m_file; } |
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88 |
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89 size_t num_fcn_names (void) const { return m_fcn_names.size (); } |
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90 |
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91 std::list<std::string> function_names (void) const; |
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92 |
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93 void add_fcn_name (const std::string&); |
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94 |
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95 bool remove_fcn_name (const std::string&); |
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96 |
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97 void clear_fcn_names (void) { m_fcn_names.clear (); } |
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98 |
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99 public: |
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100 |
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101 refcount<octave_idx_type> m_count; |
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102 |
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103 protected: |
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104 |
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105 void fake_reload (void); |
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106 |
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107 static std::map<std::string, dynlib_rep *> s_instances; |
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108 |
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109 // Set of hooked function names. |
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110 typedef std::map<std::string, size_t>::iterator fcn_names_iterator; |
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111 typedef std::map<std::string, size_t>::const_iterator fcn_names_const_iterator; |
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112 |
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113 std::map<std::string, size_t> m_fcn_names; |
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114 std::string m_file; |
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115 sys::time m_time_loaded; |
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116 bool m_search_all_loaded; |
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117 }; |
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118 |
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119 private: |
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120 |
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121 static dynlib_rep s_nil_rep; |
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122 |
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123 public: |
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124 |
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125 dynamic_library (void) : m_rep (&s_nil_rep) { m_rep->m_count++; } |
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126 |
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127 dynamic_library (const std::string& f, bool fake = true) |
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128 : m_rep (dynlib_rep::get_instance (f, fake)) { } |
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129 |
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130 ~dynamic_library (void) |
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131 { |
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132 if (--m_rep->m_count == 0 && m_rep != &s_nil_rep) |
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133 delete m_rep; |
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134 } |
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136 dynamic_library (const dynamic_library& sl) |
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137 : m_rep (sl.m_rep) |
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138 { |
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139 m_rep->m_count++; |
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140 } |
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142 dynamic_library& operator = (const dynamic_library& sl) |
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143 { |
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144 if (m_rep != sl.m_rep) |
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145 { |
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146 if (--m_rep->m_count == 0 && m_rep != &s_nil_rep) |
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147 delete m_rep; |
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149 m_rep = sl.m_rep; |
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150 m_rep->m_count++; |
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151 } |
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153 return *this; |
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154 } |
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156 bool operator == (const dynamic_library& sl) const |
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157 { return (m_rep == sl.m_rep); } |
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158 |
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159 operator bool () const { return m_rep->is_open (); } |
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160 |
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161 void open (const std::string& f) |
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162 { *this = dynamic_library (f); } |
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163 |
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164 std::list<std::string> close (void) |
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165 { |
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166 std::list<std::string> removed_fcns = m_rep->function_names (); |
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167 |
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168 m_rep->clear_fcn_names (); |
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170 *this = dynamic_library (); |
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171 |
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172 return removed_fcns; |
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173 } |
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174 |
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175 void * search (const std::string& nm, |
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176 const name_mangler& mangler = name_mangler ()) const |
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177 { |
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178 void *f = m_rep->search (nm, mangler); |
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179 if (f) |
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180 m_rep->add_fcn_name (nm); |
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182 return f; |
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183 } |
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185 void add (const std::string& name) |
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186 { m_rep->add_fcn_name (name); } |
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187 |
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188 bool remove (const std::string& name) |
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189 { return m_rep->remove_fcn_name (name); } |
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190 |
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191 size_t number_of_functions_loaded (void) const |
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192 { return m_rep->num_fcn_names (); } |
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193 |
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194 bool is_out_of_date (void) const |
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195 { return m_rep->is_out_of_date (); } |
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197 std::string file_name (void) const |
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198 { return m_rep->file_name (); } |
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199 |
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200 sys::time time_loaded (void) const |
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201 { return m_rep->time_loaded (); } |
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203 private: |
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205 dynlib_rep *m_rep; |
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206 }; |
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207 } |
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209 #endif |