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annotate liboctave/oct-shlib.h @ 9958:80432f0ee895

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improve octave_shlib for safer shared libs treatment
author Jaroslav Hajek <highegg@gmail.com>
date Thu, 10 Dec 2009 09:14:47 +0100
parents eb63fbe60fab
children 14ed68363284
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1 /*
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2
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3 Copyright (C) 1999, 2000, 2002, 2004, 2005, 2006, 2007, 2008 John W. Eaton
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4 Copyright (C) 2009 VZLU Prague
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5
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6 This file is part of Octave.
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7
c19f4b9484af [project @ 1999-10-29 21:52:12 by jwe]
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8 Octave is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 3 of the License, or (at your
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11 option) any later version.
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12
c19f4b9484af [project @ 1999-10-29 21:52:12 by jwe]
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13 Octave is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with Octave; see the file COPYING. If not, see
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20 <http://www.gnu.org/licenses/>.
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21
c19f4b9484af [project @ 1999-10-29 21:52:12 by jwe]
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22 */
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23
c19f4b9484af [project @ 1999-10-29 21:52:12 by jwe]
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24 #if !defined (octave_shlib_h)
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25 #define octave_shlib_h 1
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26
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27 #include <string>
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28 #include <map>
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29
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30 #include "oct-time.h"
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31
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32 class
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33 OCTAVE_API
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34 octave_shlib
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35 {
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36 public: // FIXME: make this class private?
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37
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38 typedef std::string (*name_mangler) (const std::string&);
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39 typedef void (*close_hook) (const std::string&);
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40
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41 class shlib_rep
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42 {
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43 public:
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44
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45 shlib_rep (void)
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46 : count (1), file (), tm_loaded (time_t ()) { }
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47
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48 protected:
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49
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50 shlib_rep (const std::string& f);
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51
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52 public:
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53
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54 virtual ~shlib_rep (void)
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55 {
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56 instances.erase (file);
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57 }
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58
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59 virtual bool is_open (void) const
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60 { return false; }
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61
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62 virtual void *search (const std::string&, name_mangler = 0)
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63 { return 0; }
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64
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65 bool is_out_of_date (void) const;
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66
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67 // This method will be overriden conditionally.
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68 static shlib_rep *new_instance (const std::string& f);
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69
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70 static shlib_rep *get_instance (const std::string& f, bool fake);
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71
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72 octave_time time_loaded (void) const
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73 { return tm_loaded; }
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74
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75 std::string file_name (void) const
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76 { return file; }
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77
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78 void insert_hook_name (const std::string& name) const;
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79
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80 void erase_hook_name (const std::string& name) const;
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82 size_t num_fcn_names (void) const { return fcn_names.size (); }
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83
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84 void add_fcn_name (const std::string&);
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85
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86 bool remove_fcn_name (const std::string&);
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87
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88 void do_close_hook (close_hook cl_hook);
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89
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90 public:
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91
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92 int count;
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93
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94 protected:
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95
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96 void fake_reload (void);
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97
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98 std::string file;
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99 octave_time tm_loaded;
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100
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101 // Set of hooked function names.
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102 typedef std::map<std::string, size_t>::iterator fcn_names_iterator;
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103 typedef std::map<std::string, size_t>::const_iterator fcn_names_const_iterator;
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104
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105 std::map<std::string, size_t> fcn_names;
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106
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107 static std::map<std::string, shlib_rep *> instances;
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108 };
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109
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110 private:
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111
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112 static shlib_rep nil_rep;
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113
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114 public:
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115
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116 octave_shlib (void) : rep (&nil_rep) { rep->count++; }
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117
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118 octave_shlib (const std::string& f, bool fake = true)
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119 : rep (shlib_rep::get_instance (f, fake)) { }
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120
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121 ~octave_shlib (void)
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122 {
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123 if (--rep->count == 0)
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124 delete rep;
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125 }
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126
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127 octave_shlib (const octave_shlib& sl)
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128 {
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129 rep = sl.rep;
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130 rep->count++;
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131 }
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132
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133 octave_shlib& operator = (const octave_shlib& sl)
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134 {
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135 if (rep != sl.rep)
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136 {
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137 if (--rep->count == 0)
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138 delete rep;
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139
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140 rep = sl.rep;
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141 rep->count++;
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142 }
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143
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144 return *this;
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145 }
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146
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147 bool operator == (const octave_shlib& sl) const
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148 { return (rep == sl.rep); }
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149
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150 operator bool () const { return rep->is_open (); }
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151
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152 void open (const std::string& f)
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153 { *this = octave_shlib (f); }
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154
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155 void close (close_hook cl_hook = 0)
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156 {
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157 if (cl_hook)
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158 rep->do_close_hook (cl_hook);
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159
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160 *this = octave_shlib ();
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161 }
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162
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163 void *search (const std::string& nm, name_mangler mangler = 0) const
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164 {
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165 void *f = rep->search (nm, mangler);
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166 if (f)
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167 rep->add_fcn_name (nm);
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168
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169 return f;
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170 }
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171
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172 void add (const std::string& name)
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173 { rep->add_fcn_name (name); }
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174
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175 bool remove (const std::string& name)
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176 { return rep->remove_fcn_name (name); }
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177
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178 size_t number_of_functions_loaded (void) const
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179 { return rep->num_fcn_names (); }
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180
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181 bool is_out_of_date (void) const
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182 { return rep->is_out_of_date (); }
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183
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184 std::string file_name (void) const
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185 { return rep->file_name (); }
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186
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187 octave_time time_loaded (void) const
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188 { return rep->time_loaded (); }
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189
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190 private:
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191
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192 shlib_rep *rep;
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193 };
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194
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195 #endif
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196
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197 /*
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198 ;;; Local Variables: ***
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199 ;;; mode: C++ ***
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200 ;;; End: ***
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201 */