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1 /* |
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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 "oct-time.h" |
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28 #include "file-stat.h" |
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29 |
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30 #include "DLList.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 template class DLNode<octave_shlib>; |
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46 template class DLList<octave_shlib>; |
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47 |
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48 class |
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49 octave_shlib_list |
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50 { |
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51 public: |
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52 |
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53 static void append (const octave_shlib& shl); |
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54 |
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55 static void remove (octave_shlib& shl); |
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56 |
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57 static void *search (const string& fcn_name, octave_shlib& shl, |
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58 octave_shlib::name_mangler mangler = 0); |
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59 |
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60 private: |
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61 |
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62 octave_shlib_list (void) { } |
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63 |
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64 ~octave_shlib_list (void) { } |
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65 |
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66 void do_append (const octave_shlib& shl); |
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67 |
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68 void do_remove (octave_shlib& shl); |
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69 |
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70 void *do_search (const string& fcn_name, octave_shlib& shl, |
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71 octave_shlib::name_mangler mangler = 0); |
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72 |
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73 static octave_shlib_list *instance; |
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74 |
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75 static bool instance_ok (void); |
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76 |
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77 // List of libraries we have loaded. |
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78 DLList<octave_shlib> lib_list; |
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79 |
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80 // No copying! |
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81 |
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82 octave_shlib_list (const octave_shlib_list&); |
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83 |
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84 octave_shlib_list& operator = (const octave_shlib_list&); |
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85 }; |
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86 |
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87 octave_shlib_list *octave_shlib_list::instance = 0; |
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88 |
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89 void |
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90 octave_shlib_list::do_append (const octave_shlib& shl) |
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91 { |
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92 lib_list.append (shl); |
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93 } |
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94 |
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95 void |
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96 octave_shlib_list::do_remove (octave_shlib& shl) |
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97 { |
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98 for (Pix p = lib_list.first (); p != 0; lib_list.next (p)) |
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99 { |
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100 if (lib_list(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.del (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 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 (Pix p = lib_list.first (); p != 0; lib_list.next (p)) |
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120 { |
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121 function = lib_list(p).search (fcn_name, mangler); |
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122 |
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123 if (function) |
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124 { |
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125 shl = lib_list(p); |
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126 |
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127 break; |
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128 } |
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129 } |
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130 |
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131 return function; |
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132 } |
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133 |
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134 bool |
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135 octave_shlib_list::instance_ok (void) |
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136 { |
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137 bool retval = true; |
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138 |
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139 if (! instance) |
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140 instance = new octave_shlib_list (); |
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141 |
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142 if (! instance) |
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143 { |
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144 ::error ("unable to create shared library list object!"); |
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145 |
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146 retval = false; |
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147 } |
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148 |
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149 return retval; |
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150 } |
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151 |
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152 void |
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153 octave_shlib_list::append (const octave_shlib& shl) |
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154 { |
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155 if (instance_ok ()) |
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156 instance->do_append (shl); |
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157 } |
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158 |
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159 void |
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160 octave_shlib_list::remove (octave_shlib& shl) |
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161 { |
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162 if (instance_ok ()) |
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163 instance->do_remove (shl); |
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164 } |
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165 |
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166 void * |
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167 octave_shlib_list::search (const string& fcn_name, octave_shlib& shl, |
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168 octave_shlib::name_mangler mangler) |
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169 { |
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170 return (instance_ok ()) ? instance->do_search (fcn_name, shl, mangler) : 0; |
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171 } |
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172 |
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173 octave_dynamic_loader *octave_dynamic_loader::instance = 0; |
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174 |
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175 bool octave_dynamic_loader::doing_load = false; |
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176 |
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177 bool |
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178 octave_dynamic_loader::instance_ok (void) |
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179 { |
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180 bool retval = true; |
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181 |
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182 if (! instance) |
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183 instance = new octave_dynamic_loader (); |
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184 |
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185 if (! instance) |
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186 { |
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187 error ("unable to create dynamic loader object!"); |
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188 |
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189 retval = false; |
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190 } |
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191 |
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192 return retval; |
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193 } |
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194 |
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195 static |
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196 void clear_function (const string& fcn_name) |
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197 { |
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198 if (Vwarn_reload_forces_clear) |
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199 warning (" %s", fcn_name.c_str ()); |
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200 |
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201 curr_sym_tab->clear (fcn_name); |
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202 |
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203 if (curr_sym_tab != top_level_sym_tab) |
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204 top_level_sym_tab->clear (fcn_name); |
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205 |
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206 global_sym_tab->clear (fcn_name); |
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207 } |
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208 |
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209 bool |
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210 octave_dynamic_loader::do_load (const string& fcn_name) |
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211 { |
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212 bool retval = false; |
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213 |
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214 octave_shlib oct_file; |
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215 |
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216 unwind_protect::begin_frame ("octave_dynamic_loader::do_load"); |
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217 |
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218 unwind_protect_bool (octave_dynamic_loader::doing_load); |
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219 |
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220 doing_load = true; |
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221 |
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222 void *function |
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223 = octave_shlib_list::search (fcn_name, oct_file, mangle_name); |
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224 |
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225 if (! error_state) |
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226 { |
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227 if (function && oct_file.is_out_of_date ()) |
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228 { |
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229 int n = oct_file.number_of_functions_loaded (); |
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230 |
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231 if (n > 0 && Vwarn_reload_forces_clear) |
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232 warning ("reloading %s clears the following functions:", |
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233 oct_file.file_name().c_str ()); |
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234 |
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235 oct_file.close (clear_function); |
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236 |
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237 function = 0; |
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238 } |
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239 |
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240 if (! function) |
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241 { |
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242 string oct_file_name = oct_file_in_path (fcn_name); |
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243 |
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244 if (! oct_file_name.empty ()) |
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245 { |
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246 oct_file.open (oct_file_name, Vwarn_future_time_stamp); |
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247 |
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248 if (! error_state) |
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249 { |
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250 if (oct_file) |
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251 { |
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252 octave_shlib_list::append (oct_file); |
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253 |
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254 function = oct_file.search (fcn_name, mangle_name); |
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255 } |
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256 else |
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257 error ("%s is not a valid shared library", |
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258 oct_file_name.c_str ()); |
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259 } |
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260 } |
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261 } |
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262 } |
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263 |
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264 if (function) |
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265 { |
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266 octave_dld_fcn_installer f |
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267 = X_CAST (octave_dld_fcn_installer, function); |
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268 |
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269 retval = f (oct_file); |
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270 |
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271 if (! retval) |
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272 error ("failed to install dld function `%s'", fcn_name.c_str ()); |
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273 } |
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274 |
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275 unwind_protect::run_frame ("octave_dynamic_loader::do_load"); |
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276 |
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277 return retval; |
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278 } |
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279 |
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280 bool |
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281 octave_dynamic_loader::do_remove (const string& fcn_name, octave_shlib& shl) |
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282 { |
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283 bool retval = false; |
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284 |
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285 // We don't need to do anything if this is called because we are in |
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286 // the process of reloading a .oct file that has changed. |
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287 |
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288 if (! doing_load) |
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289 { |
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290 retval = shl.remove (fcn_name); |
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291 |
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292 if (shl.number_of_functions_loaded () == 0) |
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293 octave_shlib_list::remove (shl); |
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294 } |
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295 |
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296 return retval; |
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297 } |
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298 |
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299 bool |
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300 octave_dynamic_loader::load (const string& fcn_name) |
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301 { |
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302 return (instance_ok ()) ? instance->do_load (fcn_name) : false; |
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303 } |
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304 |
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305 bool |
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306 octave_dynamic_loader::remove (const string& fcn_name, octave_shlib& shl) |
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307 { |
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308 return (instance_ok ()) ? instance->do_remove (fcn_name, shl) : false; |
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309 } |
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310 |
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311 string |
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312 octave_dynamic_loader::mangle_name (const string& name) |
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313 { |
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314 #if defined (CXX_PREPENDS_UNDERSCORE) |
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315 string retval ("_FS"); |
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316 #else |
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317 string retval ("FS"); |
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318 #endif |
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319 retval.append (name); |
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320 retval.append ("__FRC12octave_shlib"); |
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321 return retval; |
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322 } |
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323 |
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324 static int |
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325 warn_reload_forces_clear (void) |
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326 { |
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327 Vwarn_reload_forces_clear = check_preference ("warn_reload_forces_clear"); |
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328 |
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329 return 0; |
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330 } |
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331 |
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332 void |
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333 symbols_of_dynamic_ld (void) |
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334 { |
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335 DEFVAR (warn_reload_forces_clear, 1.0, warn_reload_forces_clear, |
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336 "warn if reloading a .oct file forces other functions to be cleared"); |
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337 } |
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338 |
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339 /* |
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340 ;;; Local Variables: *** |
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341 ;;; mode: C++ *** |
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342 ;;; End: *** |
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343 */ |
