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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 #if defined (HAVE_DLFCN_H) |
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38 #include <dlfcn.h> |
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39 #else |
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40 extern void *dlopen (const char *, int); |
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41 extern const char *dlerror (void); |
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42 extern void *dlsym (void *, const char *); |
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43 extern int dlclose (void *); |
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44 #endif |
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45 #ifndef RTLD_LAZY |
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46 #define RTLD_LAZY 1 |
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47 #endif |
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48 #elif defined (WITH_SHL) |
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49 #include <dl.h> |
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50 #endif |
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51 } |
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52 |
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53 #include <defaults.h> |
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54 #include "dirfns.h" |
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55 #include "dynamic-ld.h" |
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56 #include "error.h" |
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57 #include "toplev.h" |
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58 #include "pathsearch.h" |
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59 #include "oct-obj.h" |
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60 #include "ov-builtin.h" |
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61 #include "ov.h" |
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62 #include "utils.h" |
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63 #include "variables.h" |
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64 |
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65 #if defined (WITH_DL) |
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66 |
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67 class |
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68 octave_dlopen_dynamic_loader : public octave_dynamic_loader |
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69 { |
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70 public: |
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71 |
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72 octave_dlopen_dynamic_loader (void) |
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73 : octave_dynamic_loader () { } |
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74 |
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75 ~octave_dlopen_dynamic_loader (void) { } |
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76 |
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77 private: |
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78 |
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79 octave_dynamic_loader::builtin_fcn_installer |
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80 resolve_reference (const string& mangled_name, const string& file); |
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81 |
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82 // No copying! |
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83 |
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84 octave_dlopen_dynamic_loader (const octave_dlopen_dynamic_loader&); |
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85 |
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86 octave_dlopen_dynamic_loader& |
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87 operator = (const octave_dlopen_dynamic_loader&); |
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88 }; |
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89 |
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90 octave_dynamic_loader::builtin_fcn_installer |
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91 octave_dlopen_dynamic_loader::resolve_reference (const string& name, |
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92 const string& file) |
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93 { |
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94 octave_dynamic_loader::builtin_fcn_installer retval = 0; |
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95 |
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96 // Dynamic linking with dlopen/dlsym doesn't require specification |
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97 // of the libraries at runtime. Instead, they are specified when |
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98 // the .oct file is created. |
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99 |
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100 void *handle = dlopen (file.c_str (), RTLD_LAZY); |
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101 |
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102 const char *nm = name.c_str (); |
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103 |
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104 if (handle) |
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105 { |
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106 void *tmp = dlsym (handle, nm); |
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107 |
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108 retval = X_CAST (octave_dynamic_loader::builtin_fcn_installer, tmp); |
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109 |
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110 if (! retval) |
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111 { |
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112 const char *errmsg = dlerror (); |
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113 |
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114 if (errmsg) |
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115 error("%s: `%s'", nm, errmsg); |
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116 else |
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117 error("unable to link function `%s'", nm); |
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118 |
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119 dlclose (handle); |
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120 } |
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121 } |
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122 else |
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123 error ("%s: %s `%s'", dlerror (), file.c_str (), nm); |
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124 |
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125 return retval; |
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126 } |
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127 |
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128 #elif defined (WITH_SHL) |
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129 |
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130 class |
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131 octave_shl_load_dynamic_loader : public octave_dynamic_loader |
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132 { |
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133 public: |
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134 |
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135 octave_shl_load_dynamic_loader (void) |
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136 : octave_dynamic_loader () { } |
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137 |
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138 ~octave_shl_load_dynamic_loader (void) { } |
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139 |
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140 private: |
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141 |
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142 octave_dynamic_loader::builtin_fcn_installer |
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143 resolve_reference (const string& mangled_name, const string& file); |
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144 |
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145 // No copying! |
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146 |
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147 octave_shl_load_dynamic_loader (const octave_shl_load_dynamic_loader&); |
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148 |
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149 octave_shl_load_dynamic_loader& |
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150 operator = (const octave_shl_load_dynamic_loader&); |
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151 }; |
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152 |
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153 octave_dynamic_loader::builtin_fcn_installer |
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154 octave_shl_load_dynamic_loader::resolve_reference (const string& name, |
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155 const string& file) |
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156 { |
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157 octave_dynamic_loader::builtin_fcn_installer retval = 0; |
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158 |
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159 // Dynamic linking with shl_load/shl_findsym doesn't require |
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160 // specification of the libraries at runtime. Instead, they are |
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161 // specified when the .oct file is created. |
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162 |
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163 shl_t handle = shl_load (file.c_str (), BIND_DEFERRED, 0L); |
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164 |
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165 const char *nm = name.c_str (); |
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166 |
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167 if (handle) |
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168 { |
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169 // Don't use TYPE_PROCEDURE here. The man page says that future |
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170 // versions of HP-UX may not support it. |
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171 |
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172 int status = shl_findsym (&handle, nm, TYPE_UNDEFINED, &retval); |
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173 |
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174 if (status < 0) |
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175 { |
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176 const char *errmsg = strerror (errno); |
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177 |
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178 if (errmsg) |
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179 error("%s: `%s'", nm, errmsg); |
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180 else |
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181 error("unable to link function `%s'", nm); |
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182 |
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183 retval = 0; |
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184 } |
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185 } |
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186 else |
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187 error ("%s: %s `%s'", strerror (errno), file.c_str (), nm); |
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188 |
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189 return retval; |
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190 } |
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191 |
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192 #endif |
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193 |
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194 octave_dynamic_loader *octave_dynamic_loader::instance = 0; |
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195 |
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196 bool |
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197 octave_dynamic_loader::instance_ok (void) |
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198 { |
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199 bool retval = true; |
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200 |
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201 if (! instance) |
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202 make_dynamic_loader (); |
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203 |
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204 if (! instance) |
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205 { |
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206 error ("unable to create command history object!"); |
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207 |
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208 retval = false; |
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209 } |
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210 |
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211 return retval; |
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212 } |
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213 |
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214 void |
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215 octave_dynamic_loader::make_dynamic_loader (void) |
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216 { |
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217 #if defined (WITH_DL) |
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218 instance = new octave_dlopen_dynamic_loader (); |
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219 #elif defined (WITH_SHL) |
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220 instance = new octave_shl_load_dynamic_loader (); |
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221 #else |
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222 instance = new octave_dynamic_loader (); |
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223 #endif |
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224 } |
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225 |
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226 bool |
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227 octave_dynamic_loader::load_fcn_from_dot_oct_file (const string& fcn_name) |
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228 { |
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229 if (! instance_ok ()) |
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230 make_dynamic_loader (); |
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231 |
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232 bool retval = false; |
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233 |
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234 string oct_file = oct_file_in_path (fcn_name); |
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235 |
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236 if (! oct_file.empty ()) |
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237 { |
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238 string mangled_name = instance->mangle_name (fcn_name); |
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239 |
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240 builtin_fcn_installer f |
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241 = instance->resolve_reference (mangled_name, oct_file); |
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242 |
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243 |
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244 // XXX FIXME XXX -- this should probably be handled correctly by |
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245 // mangle_octave_oct_file_name using a configure test. |
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246 |
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247 // Perhaps we should always check for both forms of the name and |
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248 // issue a warning if they both exist? (I still think it would |
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249 // be best to use some configure test to determine exactly what |
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250 // form of the symbol name we should be looking for...) |
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251 |
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252 if (! f) |
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253 { |
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254 string t = "_"; |
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255 |
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256 mangled_name = t.append (mangled_name); |
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257 |
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258 f = instance->resolve_reference (mangled_name, oct_file); |
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259 } |
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260 |
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261 if (f) |
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262 retval = f (); |
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263 } |
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264 |
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265 return retval; |
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266 } |
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267 |
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268 octave_dynamic_loader::builtin_fcn_installer |
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269 octave_dynamic_loader::resolve_reference (const string&, const string&) |
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270 { |
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271 return 0; |
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272 } |
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273 |
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274 string |
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275 octave_dynamic_loader::mangle_name (const string& name) |
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276 { |
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277 string retval ("FS"); |
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278 retval.append (name); |
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279 retval.append ("__Fv"); |
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280 return retval; |
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281 } |
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282 |
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283 /* |
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284 ;;; Local Variables: *** |
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285 ;;; mode: C++ *** |
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286 ;;; End: *** |
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287 */ |
