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388
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1 /* emodules.c - Support routines for dynamic module loading
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2 (C) Copyright 1998, 1999 J. Kean Johnston. All rights reserved.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 #include "emodules.h"
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22 #include "sysdll.h"
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23
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24 #ifdef HAVE_SHLIB
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25
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26 /* CE-Emacs version number */
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27 Lisp_Object Vmodule_version;
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28
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29 /* Do we do our work quietly? */
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30 int load_modules_quietly;
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31
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32 /* Load path */
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33 Lisp_Object Vmodule_load_path;
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34
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35 typedef struct _emodules_list
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36 {
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37 int used; /* Is this slot used? */
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38 char *soname; /* Name of the shared object loaded (full path) */
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39 char *modname; /* The name of the module */
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40 char *modver; /* The version that the module is at */
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41 char *modtitle; /* How the module announces itself */
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42 dll_handle dlhandle; /* Dynamic lib handle */
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43 } emodules_list;
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44
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45 static int emodules_depth;
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46 static dll_handle dlhandle;
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47 static emodules_list *modules;
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48 static int modnum;
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49
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50 static int find_make_module (CONST char *mod, CONST char *name, CONST char *ver, int make_or_find);
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51 static Lisp_Object module_load_unwind (Lisp_Object);
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52 static void attempt_module_delete (int mod);
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53
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54 DEFUN ("load-module", Fload_module, 1, 3, "FLoad dynamic module: ", /*
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55 Load in a C Emacs Extension module named FILE.
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56 The optional NAME and VERSION are used to identify specific modules.
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57
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58 This function is similar in intent to `load' except that it loads in
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59 pre-compiled C or C++ code, using dynamic shared objects. If NAME is
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60 specified, then the module is only loaded if its internal name matches
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61 the NAME specified. If VERSION is specified, then the module is only
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62 loaded if it matches that VERSION. This function will check to make
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63 sure that the same module is not loaded twice. Modules are searched
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64 for in the same way as Lisp files, except that the valid file
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65 extensions are `.so', `.dll' or `.ell'.
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66
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67 All symbols in the shared module must be completely resolved in order
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68 for this function to be successful. Any modules which the specified
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69 FILE depends on will be automatically loaded. You can determine which
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70 modules have been loaded as dynamic shared objects by examining the
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71 return value of the function `list-modules'.
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72
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73 It is possible, although unwise, to unload modules using `unload-module'.
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74 The prefered mechanism for unloading or reloading modules is to quit
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75 XEmacs, and then reload those new or changed modules that are required.
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76
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77 Messages informing you of the progress of the load are displayed unless
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78 the variable `load-modules-quietly' is non-NIL.
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79 */
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80 (file,name,version))
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81 {
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82 char *mod, *mname, *mver;
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83 int speccount = specpdl_depth();
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84
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85 CHECK_STRING(file);
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86
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87 mod = (char *)XSTRING_DATA (file);
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88
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89 if (NILP (name))
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90 mname = "";
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91 else
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92 mname = (char *)XSTRING_DATA (name);
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93
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94 if (NILP (version))
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95 mver = "";
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96 else
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97 mver = (char *)XSTRING_DATA (version);
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98
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99 dlhandle = 0;
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100 record_unwind_protect (module_load_unwind, make_int(modnum));
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101 emodules_load (mod, mname, mver);
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102 unbind_to (speccount, Qnil);
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103
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104 return Qt;
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105 }
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106
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107 #ifdef DANGEROUS_NASTY_SCARY_MONSTER
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108
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109 DEFUN ("unload-module", Fmodule_unload, 1, 3, 0, /*
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110 Unload a module previously loaded with load-module.
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111
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112 As with load-module, this function requires at least the module FILE, and
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113 optionally the module NAME and VERSION to unload. It may not be possible
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114 for the module to be unloaded from memory, as there may be Lisp objects
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115 refering to variables inside the module code. However, once you have
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116 requested a module to be unloaded, it will be unloaded from memory as
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117 soon as the last reference to symbols within the module is destroyed.
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118 */
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119 (file,name,version))
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120 {
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121 int x;
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122 char *mod, *mname, *mver;
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123
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124 CHECK_STRING(file);
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125
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126 mod = (char *)XSTRING_DATA (file);
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127
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128 if (NILP (name))
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129 mname = "";
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130 else
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131 mname = (char *)XSTRING_DATA (name);
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132
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133 if (NILP (version))
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134 mver = "";
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135 else
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136 mver = (char *)XSTRING_DATA (version);
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137
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138 x = find_make_module (mod, mname, mver, 1);
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139 if (x != -1)
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140 attempt_module_delete (x);
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141 return Qt;
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142 }
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143 #endif /* DANGEROUS_NASTY_SCARY_MONSTER */
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144
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145 DEFUN ("list-modules", Flist_modules, 0, 0, "", /*
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146 Produce a list of loaded dynamic modules.
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147
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148 This function will return a list of all the loaded dynamic modules.
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149 Each element in the list is a list in the form (SONAME NAME VER DESC),
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150 where SONAME is the name of the shared object that was loaded, NAME
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151 is the internal module name, VER is the version of the module, and DESC
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152 is how the module describes itself.
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153
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154 This function returns a list, so you will need to assign the return value
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155 to a variable and then examine the variable with `describe-variable'.
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156 For example:
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157
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158 (setq mylist (list-modules))
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159 (describe-variable 'mylist)
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160
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161
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162 NOTE: It is possible for the same module to be loaded more than once,
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163 at different versions. However, you should never see the same module,
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164 with the same name and version, loaded more than once. If you do, this
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165 is a bug, and you are encouraged to report it.
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166 */
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167 ())
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168 {
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169 Lisp_Object mlist = Qnil;
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170 int i;
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171
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172 for (i = 0; i < modnum; i++)
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173 {
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174 if (modules[i].used == 1)
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175 mlist = Fcons (list4 (build_string (modules[i].soname),
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176 build_string (modules[i].modname),
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177 build_string (modules[i].modver),
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178 build_string (modules[i].modtitle)), mlist);
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179 }
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180
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181 return mlist;
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182 }
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183
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184 static int
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185 find_make_module (CONST char *mod, CONST char *name, CONST char *ver, int mof)
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186 {
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187 int i, fs = -1;
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188
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189 for (i = 0; i < modnum; i++)
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190 {
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191 if (fs == -1 && modules[i].used == 0)
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192 fs = i;
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193 if (strcmp (modules[i].soname, mod) == 0)
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194 {
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195 if (name && name[0] && strcmp (modules[i].modname, name))
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196 continue;
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197 if (ver && ver[0] && strcmp (modules[i].modver, ver))
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198 continue;
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199 return i; /* Found a match */
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200 }
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201 }
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202
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203 if (mof)
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204 return fs;
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205
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206 if (fs != -1)
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207 return fs; /* First free slot */
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208
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209 /*
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210 * We only get here if we havent found a free slot and the module was
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211 * not previously loaded.
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212 */
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213 if (modules == (emodules_list *)0)
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214 modules = (emodules_list *)xmalloc (sizeof(emodules_list));
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215 modnum++;
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216 modules = xrealloc (modules, modnum * sizeof(emodules_list));
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217
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218 fs = modnum - 1;
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219 memset (&modules[fs], 0, sizeof(emodules_list));
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220 return fs;
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221 }
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222
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223 static void
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224 attempt_module_delete (int mod)
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225 {
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226 if (dll_close (modules[mod].dlhandle) == 0)
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227 {
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228 xfree (modules[mod].soname);
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229 xfree (modules[mod].modname);
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230 xfree (modules[mod].modver);
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231 xfree (modules[mod].modtitle);
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232 modules[mod].dlhandle = 0;
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233 modules[mod].used = 0;
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234 }
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235 else if (modules[mod].used > 1)
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236 modules[mod].used = 1; /* We couldn't delete it - it stays */
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237 }
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238
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239 static Lisp_Object
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240 module_load_unwind (Lisp_Object upto)
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241 {
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242 int x,l=0;
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243
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244 /*
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245 * First close off the current handle if it is open.
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246 */
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247 if (dlhandle != 0)
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248 dll_close (dlhandle);
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249 dlhandle = 0;
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250
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251 if (CONSP (upto))
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252 {
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253 if (INTP (XCAR (upto)))
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254 l = XINT (XCAR (upto));
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255 free_cons (XCONS (upto));
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256 }
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257 else
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258 l = XINT (upto);
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259
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260 /*
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261 * Here we need to go through and dlclose() (IN REVERSE ORDER!) any
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262 * modules that were loaded as part of this load chain. We only mark
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263 * the slots as closed if the dlclose() succeeds.
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264 */
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265 for (x = modnum-1; x >= l; x--)
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266 {
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267 if (modules[x].used > 1)
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268 attempt_module_delete (x);
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269 }
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270 emodules_depth = 0;
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271
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272 return Qnil;
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273 }
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274
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275 /*
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276 * Do the actual grunt-work of loading in a module. We first try and
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277 * dlopen() the module. If that fails, we have an error and we bail
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278 * out immediately. If the dlopen() succeeds, we need to check for the
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279 * existance of certain special symbols.
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280 *
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281 * All modules will have complete access to the variables and functions
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282 * defined within XEmacs itself. It is up to the module to declare any
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283 * variables or functions it uses, however. Modules will also have access
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284 * to other functions and variables in other loaded modules, unless they
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285 * are defined as STATIC.
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286 *
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287 * We need to be very careful with how we load modules. If we encounter an
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288 * error along the way, we need to back out completely to the point at
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289 * which the user started. Since we can be called resursively, we need to
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290 * take care with marking modules as loaded. When we first start loading
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291 * modules, we set the counter to zero. As we enter the function each time,
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292 * we incremement the counter, and before we leave we decrement it. When
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293 * we get back down to 0, we know we are at the end of the chain and we
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294 * can mark all the modules in the list as loaded.
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295 *
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296 * When we signal an error, we need to be sure to unwind all modules loaded
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297 * thus far (but only for this module chain). It is assumed that if any
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298 * modules in a chain fail, then they all do. This is logical, considering
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299 * that the only time we recurse is when we have dependant modules. So in
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300 * the error handler we take great care to close off the module chain before
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301 * we call "error" and let the Fmodule_load unwind_protect() function handle
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302 * the cleaning up.
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303 */
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304 void
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305 emodules_load(CONST char *module, CONST char *modname, CONST char *modver)
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306 {
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307 Lisp_Object filename;
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308 Lisp_Object foundname;
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309 int fd, x, mpx;
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310 char *soname, *tmod;
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311 CONST char **f;
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312 CONST long *ellcc_rev;
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313 char *mver, *mname, *mtitle, *symname;
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314 void (*modload)(void) = 0;
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315 void (*modsyms)(void) = 0;
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316 void (*modvars)(void) = 0;
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317 void (*moddocs)(void) = 0;
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318 emodules_list *mp;
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319 struct gcpro gcpro1,gcpro2;
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320
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321 filename = Qnil;
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322 foundname = Qnil;
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323
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324 emodules_depth++;
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325 dlhandle = 0;
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326
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327 if ((module == (CONST char *)0) || (module[0] == '\0'))
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328 error ("Empty module name");
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329
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330 /* This is to get around the fact that build_string() is not declared
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331 as taking a const char * as an argument. I HATE compiler warnings. */
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332 tmod = (char *)alloca (strlen (module) + 1);
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333 strcpy (tmod, module);
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334
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335 GCPRO2(filename, foundname);
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336 filename = build_string (tmod);
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337 fd = locate_file(Vmodule_load_path, filename, ":.ell:.so:.dll", &foundname, -1);
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338 UNGCPRO;
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339
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340 if (fd < 0)
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341 signal_simple_error ("Cannot open dynamic module", filename);
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342
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343 soname = (char *)alloca (XSTRING_LENGTH (foundname) + 1);
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344 strcpy (soname, (char *)XSTRING_DATA (foundname));
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345
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346 dlhandle = dll_open (soname);
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347 if (dlhandle == (dll_handle)0)
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348 error ("Opening dynamic module: %s", dll_error (dlhandle));
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349
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350 ellcc_rev = (CONST long *)dll_variable (dlhandle, "emodule_compiler");
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351 if ((ellcc_rev == (CONST long *)0) || (*ellcc_rev <= 0))
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352 error ("Missing symbol `emodule_compiler': Invalid dynamic module");
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353 if (*ellcc_rev > EMODULES_REVISION)
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354 error ("Unsupported version `%ld(%ld)': Invalid dynamic module",
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355 *ellcc_rev, EMODULES_REVISION);
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356
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357 f = (CONST char **)dll_variable (dlhandle, "emodule_name");
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358 if ((f == (CONST char **)0) || (*f == (CONST char *)0))
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359 error ("Missing symbol `emodule_name': Invalid dynamic module");
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360
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361 mname = (char *)alloca (strlen (*f) + 1);
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362 strcpy (mname, *f);
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363 if (mname[0] == '\0')
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364 error ("Empty value for `emodule_name': Invalid dynamic module");
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365
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366 f = (CONST char **)dll_variable (dlhandle, "emodule_version");
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367 if ((f == (CONST char **)0) || (*f == (CONST char *)0))
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368 error ("Missing symbol `emodule_version': Invalid dynamic module");
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369
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370 mver = (char *)alloca (strlen (*f) + 1);
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371 strcpy (mver, *f);
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372
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373 f = (CONST char **)dll_variable (dlhandle, "emodule_title");
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374 if ((f == (CONST char **)0) || (*f == (CONST char *)0))
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375 error ("Missing symbol `emodule_title': Invalid dynamic module");
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376
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377 mtitle = (char *)alloca (strlen (*f) + 1);
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378 strcpy (mtitle, *f);
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379
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380 symname = (char *)alloca (strlen (mname) + 15);
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381
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382 strcpy (symname, "modules_of_");
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383 strcat (symname, mname);
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384 modload = (void (*)(void))dll_function (dlhandle, symname);
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385 /*
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386 * modload is optional. If the module doesnt require other modules it can
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387 * be left out.
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388 */
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389
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390 strcpy (symname, "syms_of_");
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391 strcat (symname, mname);
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392 modsyms = (void (*)(void))dll_function (dlhandle, symname);
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393 if (modsyms == (void (*)(void))0)
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394 error ("Missing symbol `%s': Invalid dynamic module", symname);
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395
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396 strcpy (symname, "vars_of_");
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397 strcat (symname, mname);
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398 modvars = (void (*)(void))dll_function (dlhandle, symname);
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|
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399 if (modvars == (void (*)(void))0)
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|
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400 error ("Missing symbol `%s': Invalid dynamic module", symname);
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401
|
|
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402 strcpy (symname, "docs_of_");
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403 strcat (symname, mname);
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404 moddocs = (void (*)(void))dll_function (dlhandle, symname);
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|
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405 if (moddocs == (void (*)(void))0)
|
|
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406 error ("Missing symbol `%s': Invalid dynamic module", symname);
|
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407
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|
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408 if (modname && modname[0] && strcmp (modname, mname))
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|
|
409 error ("Module name mismatch");
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|
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410
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|
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411 if (modver && modver[0] && strcmp (modver, mver))
|
|
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412 error ("Module version mismatch");
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413
|
|
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414 /*
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415 * Attempt to make a new slot for this module. If this really is the
|
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416 * first time we are loading this module, the used member will be 0.
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417 * If that is non-zero, we know that we have a previously loaded module
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|
|
418 * of the same name and version, and we dont need to go any further.
|
|
|
419 */
|
|
|
420 mpx = find_make_module (soname, mname, mver, 0);
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421 mp = &modules[mpx];
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|
|
422 if (mp->used > 0)
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|
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423 {
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|
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424 emodules_depth--;
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|
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425 dll_close (dlhandle);
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|
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426 return;
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|
|
427 }
|
|
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428
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|
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429 if (!load_modules_quietly)
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430 message ("Loading %s v%s (%s)", mname, mver, mtitle);
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|
|
431
|
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432 /*
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433 * We have passed the basic initialization, and can now add this
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434 * module to the list of modules.
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435 */
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|
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436 mp->used = emodules_depth + 1;
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437 mp->soname = xstrdup (soname);
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|
|
438 mp->modname = xstrdup (mname);
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|
|
439 mp->modver = xstrdup (mver);
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|
|
440 mp->modtitle = xstrdup (mtitle);
|
|
|
441 mp->dlhandle = dlhandle;
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|
|
442 dlhandle = 0;
|
|
|
443
|
|
|
444 /*
|
|
|
445 * Now we need to call the module init function and perform the various
|
|
|
446 * startup tasks.
|
|
|
447 */
|
|
|
448 if (modload != 0)
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|
|
449 (*modload)();
|
|
|
450
|
|
|
451 /*
|
|
|
452 * Now we can get the module to initialize its symbols, and then its
|
|
|
453 * variables, and lastly the documentation strings.
|
|
|
454 */
|
|
|
455 (*modsyms)();
|
|
|
456 (*modvars)();
|
|
|
457 (*moddocs)();
|
|
|
458
|
|
|
459 if (!load_modules_quietly)
|
|
|
460 message ("Loaded module %s v%s (%s)", mname, mver, mtitle);
|
|
|
461
|
|
|
462
|
|
|
463 emodules_depth--;
|
|
|
464 if (emodules_depth == 0)
|
|
|
465 {
|
|
|
466 /*
|
|
|
467 * We have reached the end of the load chain. We now go through the
|
|
|
468 * list of loaded modules and mark all the valid modules as just
|
|
|
469 * that.
|
|
|
470 */
|
|
|
471 for (x = 0; x < modnum; x++)
|
|
|
472 if (modules[x].used > 1)
|
|
|
473 modules[x].used = 1;
|
|
|
474 }
|
|
|
475 }
|
|
|
476
|
|
|
477 void
|
|
|
478 emodules_doc_subr(CONST char *symname, CONST char *doc)
|
|
|
479 {
|
|
|
480 Bytecount len = strlen (symname);
|
|
|
481 Lisp_Object sym = oblookup (Vobarray, (CONST Bufbyte *)symname, len);
|
|
|
482 struct Lisp_Subr *subr;
|
|
|
483
|
|
|
484 if (SYMBOLP(sym))
|
|
|
485 {
|
|
|
486 subr = XSUBR( XSYMBOL(sym)->function);
|
|
|
487 subr->doc = xstrdup (doc);
|
|
|
488 }
|
|
|
489 /*
|
|
|
490 * FIXME: I wish there was some way to avoid the xstrdup(). Is it
|
|
|
491 * possible to just set a pointer to the string, or somehow create a
|
|
|
492 * symbol whose value we can point to the constant string? Can someone
|
|
|
493 * look into this?
|
|
|
494 */
|
|
|
495 }
|
|
|
496
|
|
|
497 void
|
|
|
498 emodules_doc_sym (CONST char *symname, CONST char *doc)
|
|
|
499 {
|
|
|
500 Bytecount len = strlen (symname);
|
|
|
501 Lisp_Object sym = oblookup (Vobarray, (CONST Bufbyte *)symname, len);
|
|
|
502 Lisp_Object docstr;
|
|
|
503 struct gcpro gcpro1;
|
|
|
504
|
|
|
505 if (SYMBOLP(sym))
|
|
|
506 {
|
|
|
507 docstr = build_string (doc);
|
|
|
508 GCPRO1(docstr);
|
|
|
509 Fput (sym, Qvariable_documentation, docstr);
|
|
|
510 UNGCPRO;
|
|
|
511 }
|
|
|
512 }
|
|
|
513
|
|
|
514
|
|
|
515 void
|
|
|
516 syms_of_module (void)
|
|
|
517 {
|
|
|
518 DEFSUBR(Fload_module);
|
|
|
519 DEFSUBR(Flist_modules);
|
|
|
520 #ifdef DANGEROUS_NASTY_SCARY_MONSTER
|
|
|
521 DEFSUBR(Funload_module);
|
|
|
522 #endif
|
|
|
523 }
|
|
|
524
|
|
|
525 void
|
|
|
526 vars_of_module (void)
|
|
|
527 {
|
|
|
528 DEFVAR_LISP ("module-version", &Vmodule_version /*
|
|
|
529 Emacs dynamic loading mechanism version, as a string.
|
|
|
530
|
|
|
531 This string is in the form XX.YY.ppp, where XX is the major version
|
|
|
532 number, YY is the minor version number, and ppp is the patch level.
|
|
|
533 This variable can be used to distinquish between different versions of
|
|
|
534 the dynamic loading technology used in Emacs, if required. It is not
|
|
|
535 a given that this value will be the same as the Emacs version number.
|
|
|
536 */ );
|
|
|
537 Vmodule_version = Fpurecopy (build_string (EMODULES_VERSION));
|
|
|
538
|
|
|
539 DEFVAR_BOOL ("load-modules-quietly", &load_modules_quietly /*
|
|
|
540 *Set to t if module loading is to be silent.
|
|
|
541
|
|
|
542 Normally, when loading dynamic modules, Emacs will inform you of its
|
|
|
543 progress, and will display the module name and version if the module
|
|
|
544 is loaded correctly. Setting this variable to `t' will suppress these
|
|
|
545 messages. This would normally only be done if `load-module' was being
|
|
|
546 called by a Lisp function.
|
|
|
547 */);
|
|
|
548
|
|
|
549 DEFVAR_LISP ("module-load-path", &Vmodule_load_path /*
|
|
|
550 *List of directories to search for dynamic modules to load.
|
|
|
551 Each element is a string (directory name) or nil (try default directory).
|
|
|
552
|
|
|
553 Note that elements of this list *may not* begin with "~", so you must
|
|
|
554 call `expland-file-name' on them before adding them to this list.
|
|
|
555
|
|
|
556 Initialized based on EMACSMODULEPATH environment variable, if any, otherwise
|
|
|
557 to default specified the file `paths.h' when XEmacs was built. If there
|
|
|
558 were no paths specified in `paths.h', then XEmacs chooses a default
|
|
|
559 value for this variable by looking around in the file-system near the
|
|
|
560 directory in which the XEmacs executable resides.
|
|
|
561
|
|
|
562 Due to the nature of dynamic modules, the path names should almost always
|
|
|
563 refer to architecture-dependant directories. It is unwise to attempt to
|
|
|
564 store dynamic modules in a hetrogenous environment. Some environments
|
|
|
565 are similar enough to each other that XEmacs will be unable to determine
|
|
|
566 the correctness of a dynamic module, which can have unpredictable results
|
|
|
567 when a dynamic module is loaded.
|
|
|
568 */);
|
|
|
569
|
|
|
570 load_modules_quietly = 0;
|
|
|
571 emodules_depth = 0;
|
|
|
572 modules = (emodules_list *)0;
|
|
|
573 modnum = 0;
|
|
|
574 Vmodule_load_path = Qnil;
|
|
|
575 Fprovide (intern ("modules"));
|
|
|
576 }
|
|
|
577
|
|
|
578 #endif /* HAVE_SHLIB */
|
|
|
579
|
