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1 // dynamic-ld.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1993, 1994, 1995 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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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 2, or (at your option) any |
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11 later version. |
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12 |
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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, write to the Free |
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20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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240
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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #if defined (WITH_SHL) |
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29 #include <cerrno> |
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30 #include <cstring> |
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31 #endif |
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32 |
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33 #include <strstream.h> |
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34 |
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35 extern "C" |
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36 { |
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37 #if defined (WITH_DL) |
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38 #include <dlfcn.h> |
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39 #elif defined (WITH_SHL) |
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40 #include <dl.h> |
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41 #elif defined (WITH_DLD) |
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42 #include <dld/dld.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 "octave.h" |
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51 #include "pathsearch.h" |
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52 #include "tree-const.h" |
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53 #include "user-prefs.h" |
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54 #include "utils.h" |
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55 #include "variables.h" |
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56 |
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57 typedef builtin_function * (*Octave_builtin_fcn_struct_fcn)(void); |
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58 |
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59 #if defined (WITH_DYNAMIC_LINKING) |
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60 |
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61 // XXX FIXME XXX -- need to provide some way to ensure that functions |
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62 // that we are going to use will use the same naming convention as |
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63 // Octave's internal functions. It needs to be simpler than the |
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64 // current DEFUN_DLD() macro, which assumes you know how to name the |
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65 // function, the struct, and the helper function. |
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66 |
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67 static char * |
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68 mangle_octave_builtin_name (const char *name) |
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69 { |
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70 char *tmp = strconcat (name, "__FRC13Octave_objecti"); |
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71 char *retval = strconcat ("F", tmp); |
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72 delete [] tmp; |
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73 return retval; |
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74 } |
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75 |
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76 static char * |
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77 mangle_octave_oct_file_name (const char *name) |
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78 { |
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79 char *tmp = strconcat (name, "__Fv"); |
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80 char *retval = strconcat ("FS", tmp); |
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81 delete [] tmp; |
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82 return retval; |
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83 } |
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84 |
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85 #endif |
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86 |
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87 #if defined (WITH_DL) |
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88 |
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89 static void * |
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90 dl_resolve_octave_reference (const char *name, const char *file) |
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91 { |
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92 void *retval = 0; |
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93 |
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94 // Dynamic linking with dlopen/dlsym doesn't require specification |
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95 // of the libraries at runtime. Instead, they are specified when |
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96 // the .oct file is created. |
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97 |
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98 void *handle = dlopen (file, RTLD_LAZY); |
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99 |
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100 if (handle) |
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101 { |
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102 retval = dlsym (handle, name); |
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103 |
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104 if (! retval) |
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105 { |
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106 const char *errmsg = dlerror (); |
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107 |
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108 if (errmsg) |
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109 error("%s: `%s'", name, errmsg); |
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110 else |
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111 error("unable to link function `%s'", name); |
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112 |
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113 dlclose (handle); |
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114 } |
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115 } |
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116 else |
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117 error ("%s: %s `%s'", dlerror (), file, name); |
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118 |
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119 return retval; |
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120 } |
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121 |
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122 #elif defined (WITH_SHL) |
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123 |
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124 static void * |
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125 shl_resolve_octave_reference (const char *name, const char *file) |
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126 { |
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127 void *retval = 0; |
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128 |
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129 // Dynamic linking with shl_load/shl_findsym doesn't require |
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130 // specification of the libraries at runtime. Instead, they are |
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131 // specified when the .oct file is created. |
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132 |
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133 void *handle = shl_load (file, BIND_DEFERRED, 0L); |
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134 |
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135 if (handle) |
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136 { |
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137 int status = shl_findsym ((shl_t *) &handle, name, |
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138 TYPE_UNDEFINED, retval); |
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139 |
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140 if (status < 0) |
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141 { |
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142 const char *errmsg = strerror (errno); |
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143 |
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144 if (errmsg) |
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145 error("%s: `%s'", name, errmsg); |
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146 else |
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147 error("unable to link function `%s'", name); |
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148 |
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149 retval = 0; |
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150 } |
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151 } |
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152 else |
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153 error ("%s: %s `%s'", strerror (errno), file, name); |
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154 |
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155 return retval; |
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156 } |
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157 |
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158 #elif defined (WITH_DLD) |
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159 |
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160 // Now that we have the code above to do dynamic linking with the |
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161 // dlopen/dlsym interface and Linux uses elf, I doubt that this code |
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162 // will be used very much. Maybe it will be able to go away |
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163 // eventually. Consider it unsupported... |
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164 |
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165 // XXX FIXME XXX -- should this list be in a user-level variable, |
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166 // with default taken from the environment? |
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167 |
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168 #ifndef STD_LIB_PATH |
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169 #define STD_LIB_PATH "/lib:/usr/lib:/usr/local/lib" |
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170 #endif |
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171 |
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172 #ifndef OCTAVE_LIB_PATH |
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173 #define OCTAVE_LIB_PATH OCTAVE_LIBDIR ":" FLIB_PATH ":" CXXLIB_PATH |
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174 #endif |
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175 |
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176 static char *lib_dir_path = OCTAVE_LIB_PATH ":" STD_LIB_PATH; |
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177 |
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178 // This is the list of interesting libraries that Octave is linked |
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179 // with. Maybe it should include the readline, info, and kpathsea |
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180 // libraries. Would there ever be a time that they would really be |
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181 // needed? |
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182 |
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183 #ifndef SYSTEM_LIB_LIST |
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184 #define SYSTEM_LIB_LIST "libtermcap.a:libm.a" ":" CXXLIB_LIST |
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185 #endif |
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186 |
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187 #ifndef OCTAVE_LIB_LIST |
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188 #define OCTAVE_LIB_LIST "liboctdld.a:liboctave.a:libcruft.a:libdld.a" |
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189 #endif |
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190 |
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191 static char *lib_list = OCTAVE_LIB_LIST ":" FLIB_LIST ":" SYSTEM_LIB_LIST; |
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192 |
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193 static void |
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194 octave_dld_init (void) |
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195 { |
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196 static int initialized = 0; |
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197 |
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198 if (! initialized) |
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199 { |
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200 char *full_path = 0; |
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201 |
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202 char *tmp = dld_find_executable (raw_prog_name); |
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203 if (tmp) |
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204 { |
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205 full_path = make_absolute (tmp, the_current_working_directory); |
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206 free (tmp); |
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207 } |
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208 |
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209 if (full_path) |
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210 { |
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211 int status = dld_init (full_path); |
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212 |
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213 if (status != 0) |
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214 error ("failed to load symbols from `%s'", full_path); |
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215 else |
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216 initialized = 1; |
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217 } |
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218 else |
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219 { |
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220 error ("octave_dld_init: can't find full path to `%s'", |
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221 raw_prog_name); |
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222 } |
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223 } |
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224 } |
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225 |
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226 static void |
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227 octave_list_undefined_symbols (ostream& os) |
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228 { |
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229 char **list = dld_list_undefined_sym (); |
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230 |
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231 if (list) |
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232 { |
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233 os << "undefined symbols:\n\n"; |
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234 for (int i = 0; i < dld_undefined_sym_count; i++) |
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235 os << list[i] << "\n"; |
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236 os << "\n"; |
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237 } |
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238 } |
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239 |
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240 static void * |
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241 dld_resolve_octave_reference (const char *name, const char *file) |
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242 { |
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243 dld_create_reference (name); |
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244 |
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245 if (file) |
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246 { |
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247 if (dld_link (file) != 0) |
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248 { |
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249 error ("failed to link file `%s'", file); |
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250 return 0; |
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251 } |
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252 |
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253 if (dld_function_executable_p (name)) |
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254 return (void *) dld_get_func (name); |
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255 } |
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256 |
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257 // For each library, try to find it in a list of directories, then |
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258 // link to it. It would have been nice to use the kpathsea |
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259 // functions here too, but calls to them can't be nested as they |
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260 // would need to be here... |
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261 |
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262 char **libs = pathstring_to_vector (lib_list); |
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263 char **ptr = libs; |
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264 char *lib_list_elt; |
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265 |
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266 while ((lib_list_elt = *ptr++)) |
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267 { |
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268 char *lib = kpse_path_search (lib_dir_path, lib_list_elt, |
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269 kpathsea_true); |
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270 |
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271 if (lib && dld_link (lib) != 0) |
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272 { |
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273 error ("failed to link library %s", lib); |
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274 return 0; |
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275 } |
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276 |
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277 if (dld_function_executable_p (name)) |
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278 return (void *) dld_get_func (name); |
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279 } |
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280 |
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281 // If we get here, there was a problem. |
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282 |
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283 ostrstream output_buf; |
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284 octave_list_undefined_symbols (output_buf); |
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285 char *msg = output_buf.str (); |
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286 error (msg); |
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287 delete [] msg; |
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288 |
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289 return 0; |
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290 } |
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291 |
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292 #endif |
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293 |
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294 static void * |
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295 resolve_octave_reference (const char *name, const char *file = 0) |
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296 { |
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297 #if defined (WITH_DL) |
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298 |
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299 return dl_resolve_octave_reference (name, file); |
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300 |
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301 #elif defined (WITH_SHL) |
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302 |
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303 return shl_resolve_octave_reference (name, file); |
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304 |
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305 #elif defined (WITH_DLD) |
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306 |
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307 return dld_resolve_octave_reference (name, file); |
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308 |
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309 #endif |
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310 } |
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311 |
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312 Octave_builtin_fcn |
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313 load_octave_builtin (const char *name) |
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314 { |
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315 Octave_builtin_fcn retval = 0; |
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316 |
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317 #if defined (WITH_DYNAMIC_LINKING) |
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318 |
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319 char *mangled_name = mangle_octave_builtin_name (name); |
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320 |
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321 retval = (Octave_builtin_fcn) resolve_octave_reference (mangled_name); |
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322 |
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323 delete [] mangled_name; |
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324 |
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325 #endif |
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326 |
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327 return retval; |
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328 } |
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329 |
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330 int |
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331 load_octave_oct_file (const char *name) |
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332 { |
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333 int retval = 0; |
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334 |
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335 #if defined (WITH_DYNAMIC_LINKING) |
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336 |
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337 char *oct_file = oct_file_in_path (name); |
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338 |
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339 if (oct_file) |
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340 { |
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341 char *mangled_name = mangle_octave_oct_file_name (name); |
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342 |
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343 Octave_builtin_fcn_struct_fcn f = |
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344 (Octave_builtin_fcn_struct_fcn) resolve_octave_reference |
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345 (mangled_name, oct_file); |
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346 |
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347 if (f) |
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348 { |
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349 builtin_function *s = f (); |
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350 |
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351 if (s) |
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352 { |
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353 install_builtin_function (s); |
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354 retval = 1; |
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355 } |
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356 } |
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357 |
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358 delete [] oct_file; |
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359 } |
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360 |
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361 #else |
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362 |
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363 (void) name; |
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364 |
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365 #endif |
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366 |
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367 return retval; |
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368 } |
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369 |
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370 void |
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371 init_dynamic_linker (void) |
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372 { |
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373 #if defined (WITH_DLD) |
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374 |
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375 octave_dld_init (); |
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376 |
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707
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377 #endif |
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378 } |
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379 |
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380 /* |
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381 ;;; Local Variables: *** |
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382 ;;; mode: C++ *** |
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383 ;;; page-delimiter: "^/\\*" *** |
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384 ;;; End: *** |
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385 */ |
