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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include <list> |
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28 |
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29 #include "oct-time.h" |
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30 #include "file-stat.h" |
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31 |
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32 #include <defaults.h> |
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33 |
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34 #include "defun.h" |
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35 #include "dynamic-ld.h" |
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36 #include "parse.h" |
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37 #include "unwind-prot.h" |
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38 #include "utils.h" |
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39 #include "variables.h" |
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40 |
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41 // TRUE means we print a warning if reloading a .oct file forces other |
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42 // functions to be cleared. |
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43 static bool Vwarn_reload_forces_clear; |
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44 |
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45 class |
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46 octave_shlib_list |
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47 { |
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48 public: |
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49 |
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50 static void append (const octave_shlib& shl); |
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51 |
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52 static void remove (octave_shlib& shl); |
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53 |
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54 static void *search (const std::string& fcn_name, octave_shlib& shl, |
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55 octave_shlib::name_mangler mangler = 0); |
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56 |
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57 private: |
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58 |
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59 octave_shlib_list (void) { } |
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60 |
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61 ~octave_shlib_list (void) { } |
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62 |
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63 void do_append (const octave_shlib& shl); |
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64 |
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65 void do_remove (octave_shlib& shl); |
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66 |
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67 void *do_search (const std::string& fcn_name, octave_shlib& shl, |
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68 octave_shlib::name_mangler mangler = 0); |
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69 |
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70 static octave_shlib_list *instance; |
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71 |
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72 static bool instance_ok (void); |
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73 |
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74 // List of libraries we have loaded. |
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75 std::list<octave_shlib> lib_list; |
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76 |
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77 // No copying! |
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78 |
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79 octave_shlib_list (const octave_shlib_list&); |
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80 |
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81 octave_shlib_list& operator = (const octave_shlib_list&); |
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82 }; |
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83 |
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84 octave_shlib_list *octave_shlib_list::instance = 0; |
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85 |
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86 void |
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87 octave_shlib_list::do_append (const octave_shlib& shl) |
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88 { |
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89 lib_list.push_back (shl); |
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90 } |
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91 |
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92 void |
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93 octave_shlib_list::do_remove (octave_shlib& shl) |
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94 { |
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95 |
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96 for (std::list<octave_shlib>::iterator p = lib_list.begin (); |
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97 p != lib_list.end (); |
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98 p++) |
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99 { |
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100 if (*p == shl) |
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101 { |
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102 shl.close (); |
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103 |
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104 lib_list.erase (p); |
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105 |
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106 break; |
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107 } |
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108 } |
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109 } |
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110 |
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111 void * |
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112 octave_shlib_list::do_search (const std::string& fcn_name, octave_shlib& shl, |
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113 octave_shlib::name_mangler mangler) |
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114 { |
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115 void *function = 0; |
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116 |
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117 shl = octave_shlib (); |
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118 |
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119 for (std::list<octave_shlib>::iterator p = lib_list.begin (); |
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120 p != lib_list.end (); |
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121 p++) |
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122 { |
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123 function = p->search (fcn_name, mangler); |
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124 |
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125 if (function) |
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126 { |
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127 shl = *p; |
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128 |
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129 break; |
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130 } |
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131 } |
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132 |
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133 return function; |
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134 } |
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135 |
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136 bool |
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137 octave_shlib_list::instance_ok (void) |
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138 { |
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139 bool retval = true; |
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140 |
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141 if (! instance) |
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142 instance = new octave_shlib_list (); |
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143 |
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144 if (! instance) |
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145 { |
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146 ::error ("unable to create shared library list object!"); |
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147 |
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148 retval = false; |
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149 } |
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150 |
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151 return retval; |
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152 } |
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153 |
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154 void |
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155 octave_shlib_list::append (const octave_shlib& shl) |
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156 { |
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157 if (instance_ok ()) |
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158 instance->do_append (shl); |
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159 } |
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160 |
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161 void |
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162 octave_shlib_list::remove (octave_shlib& shl) |
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163 { |
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164 if (instance_ok ()) |
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165 instance->do_remove (shl); |
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166 } |
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167 |
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168 void * |
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169 octave_shlib_list::search (const std::string& fcn_name, octave_shlib& shl, |
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170 octave_shlib::name_mangler mangler) |
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171 { |
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172 return (instance_ok ()) ? instance->do_search (fcn_name, shl, mangler) : 0; |
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173 } |
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174 |
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175 octave_dynamic_loader *octave_dynamic_loader::instance = 0; |
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176 |
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177 bool octave_dynamic_loader::doing_load = false; |
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178 |
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179 bool |
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180 octave_dynamic_loader::instance_ok (void) |
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181 { |
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182 bool retval = true; |
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183 |
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184 if (! instance) |
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185 instance = new octave_dynamic_loader (); |
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186 |
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187 if (! instance) |
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188 { |
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189 ::error ("unable to create dynamic loader object!"); |
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190 |
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191 retval = false; |
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192 } |
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193 |
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194 return retval; |
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195 } |
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196 |
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197 static |
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198 void do_clear_function (const std::string& fcn_name) |
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199 { |
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200 if (Vwarn_reload_forces_clear) |
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201 warning (" %s", fcn_name.c_str ()); |
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202 |
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203 curr_sym_tab->clear (fcn_name); |
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204 |
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205 if (curr_sym_tab != top_level_sym_tab) |
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206 top_level_sym_tab->clear (fcn_name); |
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207 |
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208 fbi_sym_tab->clear (fcn_name); |
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209 } |
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210 |
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211 bool |
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212 octave_dynamic_loader::do_load (const std::string& fcn_name, |
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213 const std::string& file_name) |
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214 { |
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215 bool retval = false; |
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216 |
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217 octave_shlib oct_file; |
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218 |
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219 unwind_protect::begin_frame ("octave_dynamic_loader::do_load"); |
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220 |
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221 unwind_protect_bool (octave_dynamic_loader::doing_load); |
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222 |
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223 doing_load = true; |
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224 |
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225 void *function |
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226 = octave_shlib_list::search (fcn_name, oct_file, mangle_name); |
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227 |
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228 if (! error_state) |
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229 { |
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230 if (function && oct_file.is_out_of_date ()) |
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231 { |
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232 int n = oct_file.number_of_functions_loaded (); |
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233 |
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234 if (n > 0 && Vwarn_reload_forces_clear) |
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235 warning ("reloading %s clears the following functions:", |
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236 oct_file.file_name().c_str ()); |
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237 |
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238 oct_file.close (do_clear_function); |
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239 |
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240 function = 0; |
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241 } |
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242 |
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243 if (! function) |
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244 { |
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245 std::string oct_file_name |
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246 = file_name.empty () ? oct_file_in_path (fcn_name) : file_name; |
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247 |
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248 if (! oct_file_name.empty ()) |
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249 { |
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250 oct_file.open (oct_file_name, Vwarn_future_time_stamp); |
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251 |
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252 if (! error_state) |
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253 { |
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254 if (oct_file) |
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255 { |
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256 octave_shlib_list::append (oct_file); |
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257 |
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258 function = oct_file.search (fcn_name, mangle_name); |
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259 } |
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260 else |
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261 ::error ("%s is not a valid shared library", |
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262 oct_file_name.c_str ()); |
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263 } |
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264 } |
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265 } |
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266 } |
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267 |
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268 if (function) |
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269 { |
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270 octave_dld_fcn_installer f |
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271 = X_CAST (octave_dld_fcn_installer, function); |
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272 |
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273 retval = f (oct_file); |
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274 |
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275 if (! retval) |
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276 ::error ("failed to install dld function `%s'", fcn_name.c_str ()); |
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277 } |
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278 |
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279 unwind_protect::run_frame ("octave_dynamic_loader::do_load"); |
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280 |
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281 return retval; |
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282 } |
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283 |
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284 bool |
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285 octave_dynamic_loader::do_remove (const std::string& fcn_name, octave_shlib& shl) |
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286 { |
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287 bool retval = false; |
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288 |
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289 // We don't need to do anything if this is called because we are in |
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290 // the process of reloading a .oct file that has changed. |
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291 |
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292 if (! doing_load) |
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293 { |
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294 retval = shl.remove (fcn_name); |
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295 |
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296 if (shl.number_of_functions_loaded () == 0) |
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297 octave_shlib_list::remove (shl); |
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298 } |
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299 |
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300 return retval; |
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301 } |
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302 |
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303 bool |
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304 octave_dynamic_loader::load (const std::string& fcn_name, |
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305 const std::string& file_name) |
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306 { |
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307 return (instance_ok ()) ? instance->do_load (fcn_name, file_name) : false; |
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308 } |
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309 |
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310 bool |
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311 octave_dynamic_loader::remove (const std::string& fcn_name, octave_shlib& shl) |
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312 { |
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313 return (instance_ok ()) ? instance->do_remove (fcn_name, shl) : false; |
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314 } |
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315 |
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316 #define STRINGIFY(s) STRINGIFY1(s) |
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317 #define STRINGIFY1(s) #s |
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318 |
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319 std::string |
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320 octave_dynamic_loader::mangle_name (const std::string& name) |
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321 { |
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322 #if defined (CXX_PREPENDS_UNDERSCORE) |
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323 std::string retval ("_FS"); |
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324 #else |
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325 std::string retval ("FS"); |
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326 #endif |
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327 retval.append (name); |
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328 retval.append ("_"); |
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329 retval.append (STRINGIFY (CXX_ABI)); |
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330 return retval; |
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331 } |
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332 |
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333 static int |
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334 warn_reload_forces_clear (void) |
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335 { |
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336 Vwarn_reload_forces_clear = check_preference ("warn_reload_forces_clear"); |
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337 |
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338 return 0; |
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339 } |
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340 |
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341 void |
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342 symbols_of_dynamic_ld (void) |
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343 { |
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344 DEFVAR (warn_reload_forces_clear, true, warn_reload_forces_clear, |
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345 "-*- texinfo -*-\n\ |
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346 @defvr {Built-in Variable} warn_reload_forces_clear\n\ |
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347 If several functions have been loaded from the same file, Octave must\n\ |
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348 clear all the functions before any one of them can be reloaded. If\n\ |
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349 @code{warn_reload_forces_clear}, Octave will warn you when this happens,\n\ |
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350 and print a list of the additional functions that it is forced to clear.\n\ |
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351 @end defvr"); |
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352 } |
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353 |
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354 /* |
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355 ;;; Local Variables: *** |
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356 ;;; mode: C++ *** |
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357 ;;; End: *** |
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358 */ |
