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annotate Python/dynload_next.c @ 14333:f55b673d9acd legacy-trunk

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Revert removal of void from function definition. Guido sez I can take it out again after we complete switching to C++ <wink>. Thanks to Greg Stein for hitting me.
author Tim Peters <tim.peters@gmail.com>
date Fri, 01 Sep 2000 03:34:26 +0000
parents 5b727ab37092
children 6f6f965c5e2d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /***********************************************************
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2 Copyright (c) 2000, BeOpen.com.
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3 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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4 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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5 All rights reserved.
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6
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7 See the file "Misc/COPYRIGHT" for information on usage and
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8 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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9 ******************************************************************/
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10
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11 /* Support for dynamic loading of extension modules */
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12
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13 #include "Python.h"
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14 #include "importdl.h"
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15
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16
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17 #ifdef WITH_DYLD
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18
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19 #define USE_DYLD
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20
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21 #include <mach-o/dyld.h>
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22
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23 #else /* WITH_DYLD */
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24
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25 #define USE_RLD
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26 /* Define this to 1 if you want be able to load ObjC modules as well:
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27 it switches between two different way of loading modules on the NeXT,
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28 one that directly interfaces with the dynamic loader (rld_load(), which
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29 does not correctly load ObjC object files), and another that uses the
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30 ObjC runtime (objc_loadModules()) to do the job.
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31 You'll have to add ``-ObjC'' to the compiler flags if you set this to 1.
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32 */
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33 #define HANDLE_OBJC_MODULES 1
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34 #if HANDLE_OBJC_MODULES
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35 #include <objc/Object.h>
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36 #include <objc/objc-load.h>
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37 #endif
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38
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39 #include <mach-o/rld.h>
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40
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41 #endif /* WITH_DYLD */
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42
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43
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44 const struct filedescr _PyImport_DynLoadFiletab[] = {
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45 {".so", "rb", C_EXTENSION},
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46 {"module.so", "rb", C_EXTENSION},
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47 {0, 0}
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48 };
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49
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50 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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51 const char *pathname, FILE *fp)
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52 {
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53 dl_funcptr p = NULL;
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54 char funcname[258];
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55
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56 sprintf(funcname, "_init%.200s", shortname);
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57
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58 #ifdef USE_RLD
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59 {
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60 NXStream *errorStream;
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61 struct mach_header *new_header;
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62 const char *filenames[2];
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63 long ret;
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64 unsigned long ptr;
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65
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66 errorStream = NXOpenMemory(NULL, 0, NX_WRITEONLY);
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67 filenames[0] = pathname;
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68 filenames[1] = NULL;
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69
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70 #if HANDLE_OBJC_MODULES
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71
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72 /* The following very bogus line of code ensures that
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73 objc_msgSend, etc are linked into the binary. Without
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74 it, dynamic loading of a module that includes objective-c
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75 method calls will fail with "undefined symbol _objc_msgSend()".
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76 This remains true even in the presence of the -ObjC flag
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77 to the compiler
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78 */
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79
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80 [Object name];
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81
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82 /* objc_loadModules() dynamically loads the object files
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83 indicated by the paths in filenames. If there are any
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84 errors generated during loading -- typically due to the
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85 inability to find particular symbols -- an error message
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86 will be written to errorStream.
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87 It returns 0 if the module is successfully loaded, 1
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88 otherwise.
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89 */
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90
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91 ret = !objc_loadModules(filenames, errorStream,
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92 NULL, &new_header, NULL);
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93
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94 #else /* !HANDLE_OBJC_MODULES */
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95
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96 ret = rld_load(errorStream, &new_header,
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97 filenames, NULL);
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98
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99 #endif /* HANDLE_OBJC_MODULES */
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100
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101 /* extract the error messages for the exception */
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102 if(!ret) {
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103 char *streamBuf;
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104 int len, maxLen;
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105
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106 NXPutc(errorStream, (char)0);
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107
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108 NXGetMemoryBuffer(errorStream,
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109 &streamBuf, &len, &maxLen);
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110 PyErr_SetString(PyExc_ImportError, streamBuf);
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111 }
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112
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113 if(ret && rld_lookup(errorStream, funcname, &ptr))
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114 p = (dl_funcptr) ptr;
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115
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116 NXCloseMemory(errorStream, NX_FREEBUFFER);
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117
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118 if(!ret)
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119 return NULL;
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120 }
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121 #endif /* USE_RLD */
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122 #ifdef USE_DYLD
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123 /* This is also NeXT-specific. However, frameworks (the new style
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124 of shared library) and rld() can't be used in the same program;
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125 instead, you have to use dyld, which is mostly unimplemented. */
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126 {
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127 NSObjectFileImageReturnCode rc;
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128 NSObjectFileImage image;
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129 NSModule newModule;
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130 NSSymbol theSym;
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131 void *symaddr;
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132 const char *errString;
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133
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134 rc = NSCreateObjectFileImageFromFile(pathname, &image);
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135 switch(rc) {
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136 default:
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137 case NSObjectFileImageFailure:
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138 NSObjectFileImageFormat:
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139 /* for these a message is printed on stderr by dyld */
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140 errString = "Can't create object file image";
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141 break;
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142 case NSObjectFileImageSuccess:
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143 errString = NULL;
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144 break;
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145 case NSObjectFileImageInappropriateFile:
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146 errString = "Inappropriate file type for dynamic loading";
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147 break;
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148 case NSObjectFileImageArch:
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149 errString = "Wrong CPU type in object file";
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150 break;
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151 NSObjectFileImageAccess:
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152 errString = "Can't read object file (no access)";
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153 break;
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154 }
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155 if (errString == NULL) {
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156 newModule = NSLinkModule(image, pathname, TRUE);
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157 if (!newModule)
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158 errString = "Failure linking new module";
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159 }
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160 if (errString != NULL) {
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161 PyErr_SetString(PyExc_ImportError, errString);
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162 return NULL;
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163 }
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164 if (!NSIsSymbolNameDefined(funcname)) {
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165 /* UnlinkModule() isn't implemented in current versions, but calling it does no harm */
11599
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166 NSUnLinkModule(newModule, FALSE);
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167 PyErr_Format(PyExc_ImportError,
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168 "Loaded module does not contain symbol %.200s",
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169 funcname);
11599
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170 return NULL;
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171 }
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172 theSym = NSLookupAndBindSymbol(funcname);
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173 p = (dl_funcptr)NSAddressOfSymbol(theSym);
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174 }
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175 #endif /* USE_DYLD */
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176
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177 return p;
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178 }