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annotate Python/dynload_next.c @ 13255:916fb024ce94 legacy-trunk

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Change copyright notice.
author Guido van Rossum <guido@python.org>
date Fri, 30 Jun 2000 23:50:40 +0000
parents 5de0b939fe61
children 87ee82e5c56d
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Copyright (c) 2000, BeOpen.com.
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8 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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9 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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10 All rights reserved.
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11
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12 See the file "Misc/COPYRIGHT" for information on usage and
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13 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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14
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15 ******************************************************************/
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16
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17 /* Support for dynamic loading of extension modules */
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18
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19 #include "Python.h"
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20 #include "importdl.h"
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21
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22
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23 #ifdef WITH_DYLD
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24
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25 #define USE_DYLD
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26
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27 #include <mach-o/dyld.h>
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28
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29 #else /* WITH_DYLD */
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30
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31 #define USE_RLD
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32 /* Define this to 1 if you want be able to load ObjC modules as well:
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33 it switches between two different way of loading modules on the NeXT,
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34 one that directly interfaces with the dynamic loader (rld_load(), which
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35 does not correctly load ObjC object files), and another that uses the
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36 ObjC runtime (objc_loadModules()) to do the job.
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37 You'll have to add ``-ObjC'' to the compiler flags if you set this to 1.
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38 */
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39 #define HANDLE_OBJC_MODULES 1
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40 #if HANDLE_OBJC_MODULES
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41 #include <objc/Object.h>
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42 #include <objc/objc-load.h>
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43 #endif
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44
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45 #include <mach-o/rld.h>
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46
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47 #endif /* WITH_DYLD */
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48
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49
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50 const struct filedescr _PyImport_DynLoadFiletab[] = {
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51 {".so", "rb", C_EXTENSION},
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52 {"module.so", "rb", C_EXTENSION},
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53 {0, 0}
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54 };
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55
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56 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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57 const char *pathname, FILE *fp)
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58 {
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59 dl_funcptr p = NULL;
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60 char funcname[258];
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61
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62 sprintf(funcname, "_init%.200s", shortname);
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63
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64 #ifdef USE_RLD
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65 {
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66 NXStream *errorStream;
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67 struct mach_header *new_header;
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68 const char *filenames[2];
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69 long ret;
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70 unsigned long ptr;
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71
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72 errorStream = NXOpenMemory(NULL, 0, NX_WRITEONLY);
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73 filenames[0] = pathname;
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74 filenames[1] = NULL;
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75
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76 #if HANDLE_OBJC_MODULES
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77
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78 /* The following very bogus line of code ensures that
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79 objc_msgSend, etc are linked into the binary. Without
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80 it, dynamic loading of a module that includes objective-c
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81 method calls will fail with "undefined symbol _objc_msgSend()".
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82 This remains true even in the presence of the -ObjC flag
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83 to the compiler
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84 */
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85
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86 [Object name];
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87
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88 /* objc_loadModules() dynamically loads the object files
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89 indicated by the paths in filenames. If there are any
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90 errors generated during loading -- typically due to the
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91 inability to find particular symbols -- an error message
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92 will be written to errorStream.
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93 It returns 0 if the module is successfully loaded, 1
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94 otherwise.
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95 */
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96
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97 ret = !objc_loadModules(filenames, errorStream,
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98 NULL, &new_header, NULL);
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99
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100 #else /* !HANDLE_OBJC_MODULES */
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101
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102 ret = rld_load(errorStream, &new_header,
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103 filenames, NULL);
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104
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105 #endif /* HANDLE_OBJC_MODULES */
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106
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107 /* extract the error messages for the exception */
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108 if(!ret) {
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109 char *streamBuf;
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110 int len, maxLen;
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111
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112 NXPutc(errorStream, (char)0);
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113
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114 NXGetMemoryBuffer(errorStream,
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115 &streamBuf, &len, &maxLen);
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116 PyErr_SetString(PyExc_ImportError, streamBuf);
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117 }
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118
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119 if(ret && rld_lookup(errorStream, funcname, &ptr))
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120 p = (dl_funcptr) ptr;
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121
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122 NXCloseMemory(errorStream, NX_FREEBUFFER);
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123
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124 if(!ret)
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125 return NULL;
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126 }
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127 #endif /* USE_RLD */
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128 #ifdef USE_DYLD
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129 /* This is also NeXT-specific. However, frameworks (the new style
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130 of shared library) and rld() can't be used in the same program;
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131 instead, you have to use dyld, which is mostly unimplemented. */
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132 {
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133 NSObjectFileImageReturnCode rc;
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134 NSObjectFileImage image;
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135 NSModule newModule;
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136 NSSymbol theSym;
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137 void *symaddr;
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138 const char *errString;
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139
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140 rc = NSCreateObjectFileImageFromFile(pathname, &image);
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141 switch(rc) {
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142 default:
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143 case NSObjectFileImageFailure:
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144 NSObjectFileImageFormat:
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145 /* for these a message is printed on stderr by dyld */
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146 errString = "Can't create object file image";
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147 break;
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148 case NSObjectFileImageSuccess:
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149 errString = NULL;
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150 break;
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151 case NSObjectFileImageInappropriateFile:
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152 errString = "Inappropriate file type for dynamic loading";
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153 break;
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154 case NSObjectFileImageArch:
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155 errString = "Wrong CPU type in object file";
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156 break;
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157 NSObjectFileImageAccess:
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158 errString = "Can't read object file (no access)";
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159 break;
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160 }
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161 if (errString == NULL) {
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162 newModule = NSLinkModule(image, pathname, TRUE);
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163 if (!newModule)
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164 errString = "Failure linking new module";
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165 }
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166 if (errString != NULL) {
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167 PyErr_SetString(PyExc_ImportError, errString);
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168 return NULL;
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169 }
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170 if (!NSIsSymbolNameDefined(funcname)) {
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171 /* UnlinkModule() isn't implimented in current versions, but calling it does no harm */
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172 NSUnLinkModule(newModule, FALSE);
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173 PyErr_Format(PyExc_ImportError,
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174 "Loaded module does not contain symbol %.200s",
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175 funcname);
11599
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176 return NULL;
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177 }
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178 theSym = NSLookupAndBindSymbol(funcname);
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179 p = (dl_funcptr)NSAddressOfSymbol(theSym);
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180 }
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181 #endif /* USE_DYLD */
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182
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183 return p;
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184 }