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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 #if defined (WITH_SHL) |
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28 #include <cerrno> |
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29 #include <cstring> |
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30 #endif |
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31 |
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32 #include <strstream.h> |
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33 |
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34 extern "C" |
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35 { |
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36 #if defined (WITH_DL) |
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37 #include <dlfcn.h> |
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38 #ifndef RTLD_LAZY |
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39 #define RTLD_LAZY 1 |
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40 #endif |
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41 #elif defined (WITH_SHL) |
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42 #include <dl.h> |
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43 #endif |
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44 } |
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45 |
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46 #include <defaults.h> |
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47 #include "dirfns.h" |
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48 #include "dynamic-ld.h" |
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49 #include "error.h" |
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50 #include "toplev.h" |
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51 #include "pathsearch.h" |
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52 #include "oct-obj.h" |
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53 #include "ov-builtin.h" |
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54 #include "ov.h" |
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55 #include "utils.h" |
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56 #include "variables.h" |
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57 |
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58 #if defined (WITH_DL) |
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59 |
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60 class |
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61 octave_dlopen_dynamic_loader : public octave_dynamic_loader |
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62 { |
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63 public: |
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64 |
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65 octave_dlopen_dynamic_loader (void) |
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66 : octave_dynamic_loader () { } |
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67 |
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68 ~octave_dlopen_dynamic_loader (void) { } |
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69 |
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70 private: |
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71 |
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72 octave_dynamic_loader::builtin_fcn_installer |
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73 resolve_reference (const string& mangled_name, const string& file); |
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74 |
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75 // No copying! |
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76 |
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77 octave_dlopen_dynamic_loader (const octave_dlopen_dynamic_loader&); |
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78 |
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79 octave_dlopen_dynamic_loader& |
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80 operator = (const octave_dlopen_dynamic_loader&); |
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81 }; |
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82 |
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83 octave_dynamic_loader::builtin_fcn_installer |
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84 octave_dlopen_dynamic_loader::resolve_reference (const string& name, |
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85 const string& file) |
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86 { |
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87 octave_dynamic_loader::builtin_fcn_installer retval = 0; |
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88 |
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89 // Dynamic linking with dlopen/dlsym doesn't require specification |
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90 // of the libraries at runtime. Instead, they are specified when |
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91 // the .oct file is created. |
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92 |
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93 void *handle = dlopen (file.c_str (), RTLD_LAZY); |
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94 |
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95 const char *nm = name.c_str (); |
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96 |
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97 if (handle) |
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98 { |
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99 void *tmp = dlsym (handle, nm); |
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100 |
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101 retval = static_cast<octave_dynamic_loader::builtin_fcn_installer> (tmp); |
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102 |
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103 if (! retval) |
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104 { |
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105 const char *errmsg = dlerror (); |
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106 |
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107 if (errmsg) |
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108 error("%s: `%s'", nm, errmsg); |
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109 else |
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110 error("unable to link function `%s'", nm); |
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111 |
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112 dlclose (handle); |
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113 } |
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114 } |
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115 else |
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116 error ("%s: %s `%s'", dlerror (), file.c_str (), nm); |
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117 |
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118 return retval; |
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119 } |
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120 |
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121 #elif defined (WITH_SHL) |
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122 |
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123 class |
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124 octave_shl_load_dynamic_loader : public octave_dynamic_loader |
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125 { |
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126 public: |
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127 |
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128 octave_shl_load_dynamic_loader (void) |
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129 : octave_dynamic_loader () { } |
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130 |
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131 ~octave_shl_load_dynamic_loader (void) { } |
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132 |
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133 private: |
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134 |
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135 octave_dynamic_loader::builtin_fcn_installer |
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136 resolve_reference (const string& mangled_name, const string& file); |
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137 |
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138 // No copying! |
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139 |
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140 octave_shl_load_dynamic_loader (const octave_shl_load_dynamic_loader&); |
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141 |
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142 octave_shl_load_dynamic_loader& |
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143 operator = (const octave_shl_load_dynamic_loader&); |
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144 }; |
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145 |
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146 octave_dynamic_loader::builtin_fcn_installer |
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147 octave_shl_load_dynamic_loader::resolve_reference (const string& name, |
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148 const string& file) |
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149 { |
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150 octave_dynamic_loader::builtin_fcn_installer retval = 0; |
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151 |
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152 // Dynamic linking with shl_load/shl_findsym doesn't require |
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153 // specification of the libraries at runtime. Instead, they are |
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154 // specified when the .oct file is created. |
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155 |
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156 shl_t handle = shl_load (file.c_str (), BIND_DEFERRED, 0L); |
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157 |
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158 const char *nm = name.c_str (); |
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159 |
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160 if (handle) |
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161 { |
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162 int status = shl_findsym (&handle, nm, TYPE_UNDEFINED, retval); |
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163 |
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164 if (status < 0) |
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165 { |
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166 const char *errmsg = strerror (errno); |
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167 |
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168 if (errmsg) |
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169 error("%s: `%s'", nm, errmsg); |
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170 else |
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171 error("unable to link function `%s'", nm); |
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172 |
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173 retval = 0; |
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174 } |
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175 } |
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176 else |
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177 error ("%s: %s `%s'", strerror (errno), file.c_str (), nm); |
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178 |
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179 return retval; |
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180 } |
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181 |
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182 #endif |
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183 |
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184 octave_dynamic_loader *octave_dynamic_loader::instance = 0; |
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185 |
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186 bool |
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187 octave_dynamic_loader::instance_ok (void) |
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188 { |
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189 bool retval = true; |
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190 |
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191 if (! instance) |
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192 make_dynamic_loader (); |
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193 |
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194 if (! instance) |
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195 { |
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196 error ("unable to create command history object!"); |
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197 |
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198 retval = false; |
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199 } |
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200 |
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201 return retval; |
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202 } |
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203 |
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204 void |
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205 octave_dynamic_loader::make_dynamic_loader (void) |
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206 { |
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207 #if defined (WITH_DL) |
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208 instance = new octave_dlopen_dynamic_loader (); |
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209 #elif defined (WITH_SHL) |
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210 instance = new octave_sh_load_dynamic_loader (); |
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211 #else |
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212 instance = new octave_dynamic_loader (); |
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213 #endif |
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214 } |
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215 |
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216 bool |
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217 octave_dynamic_loader::load_fcn_from_dot_oct_file (const string& fcn_name) |
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218 { |
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219 if (! instance_ok ()) |
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220 make_dynamic_loader (); |
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221 |
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222 bool retval = false; |
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223 |
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224 string oct_file = oct_file_in_path (fcn_name); |
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225 |
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226 if (! oct_file.empty ()) |
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227 { |
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228 string mangled_name = instance->mangle_name (fcn_name); |
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229 |
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230 builtin_fcn_installer f |
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231 = instance->resolve_reference (mangled_name, oct_file); |
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232 |
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233 if (f) |
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234 retval = f (); |
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235 } |
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236 |
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237 return retval; |
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238 } |
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239 |
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240 octave_dynamic_loader::builtin_fcn_installer |
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241 octave_dynamic_loader::resolve_reference (const string&, const string&) |
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242 { |
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243 return 0; |
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244 } |
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245 |
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246 string |
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247 octave_dynamic_loader::mangle_name (const string& name) |
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248 { |
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249 string retval ("FS"); |
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250 retval.append (name); |
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251 retval.append ("__Fv"); |
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252 return retval; |
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253 } |
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254 |
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255 /* |
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256 ;;; Local Variables: *** |
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257 ;;; mode: C++ *** |
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258 ;;; End: *** |
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259 */ |
