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annotate Python/dynload_next.c @ 68233:e849d484029f 2.1

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Close 2.1 branch.
author Georg Brandl <georg@python.org>
date Sat, 05 Mar 2011 14:54:46 +0100
parents 9746219813f9
children 379fc66f4c96
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /* Support for dynamic loading of extension modules */
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3
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4 #include "Python.h"
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5 #include "importdl.h"
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6
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7
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8 #ifdef WITH_DYLD
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9
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10 #define USE_DYLD
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11
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12 #include <mach-o/dyld.h>
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13
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14 #else /* WITH_DYLD */
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15
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16 #define USE_RLD
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17 /* Define this to 1 if you want be able to load ObjC modules as well:
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18 it switches between two different way of loading modules on the NeXT,
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19 one that directly interfaces with the dynamic loader (rld_load(), which
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20 does not correctly load ObjC object files), and another that uses the
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21 ObjC runtime (objc_loadModules()) to do the job.
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22 You'll have to add ``-ObjC'' to the compiler flags if you set this to 1.
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23 */
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24 #define HANDLE_OBJC_MODULES 1
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25 #if HANDLE_OBJC_MODULES
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26 #include <objc/Object.h>
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27 #include <objc/objc-load.h>
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28 #endif
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29
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30 #include <mach-o/rld.h>
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31
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32 #endif /* WITH_DYLD */
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33
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34
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35 const struct filedescr _PyImport_DynLoadFiletab[] = {
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36 {".so", "rb", C_EXTENSION},
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37 {"module.so", "rb", C_EXTENSION},
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38 {0, 0}
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39 };
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40
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41 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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42 const char *pathname, FILE *fp)
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43 {
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44 dl_funcptr p = NULL;
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45 char funcname[258];
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46
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47 sprintf(funcname, "_init%.200s", shortname);
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48
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49 #ifdef USE_RLD
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50 {
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51 NXStream *errorStream;
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52 struct mach_header *new_header;
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53 const char *filenames[2];
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54 long ret;
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55 unsigned long ptr;
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56
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57 errorStream = NXOpenMemory(NULL, 0, NX_WRITEONLY);
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58 filenames[0] = pathname;
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59 filenames[1] = NULL;
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60
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61 #if HANDLE_OBJC_MODULES
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62
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63 /* The following very bogus line of code ensures that
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64 objc_msgSend, etc are linked into the binary. Without
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65 it, dynamic loading of a module that includes objective-c
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66 method calls will fail with "undefined symbol _objc_msgSend()".
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67 This remains true even in the presence of the -ObjC flag
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68 to the compiler
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69 */
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70
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71 [Object name];
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72
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73 /* objc_loadModules() dynamically loads the object files
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74 indicated by the paths in filenames. If there are any
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75 errors generated during loading -- typically due to the
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76 inability to find particular symbols -- an error message
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77 will be written to errorStream.
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78 It returns 0 if the module is successfully loaded, 1
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79 otherwise.
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80 */
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81
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82 ret = !objc_loadModules(filenames, errorStream,
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83 NULL, &new_header, NULL);
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84
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85 #else /* !HANDLE_OBJC_MODULES */
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86
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87 ret = rld_load(errorStream, &new_header,
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88 filenames, NULL);
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89
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90 #endif /* HANDLE_OBJC_MODULES */
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91
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92 /* extract the error messages for the exception */
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93 if(!ret) {
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94 char *streamBuf;
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95 int len, maxLen;
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96
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97 NXPutc(errorStream, (char)0);
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98
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99 NXGetMemoryBuffer(errorStream,
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100 &streamBuf, &len, &maxLen);
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101 PyErr_SetString(PyExc_ImportError, streamBuf);
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102 }
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103
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104 if(ret && rld_lookup(errorStream, funcname, &ptr))
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105 p = (dl_funcptr) ptr;
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106
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107 NXCloseMemory(errorStream, NX_FREEBUFFER);
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108
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109 if(!ret)
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110 return NULL;
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111 }
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112 #endif /* USE_RLD */
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113 #ifdef USE_DYLD
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114 /* This is also NeXT-specific. However, frameworks (the new style
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115 of shared library) and rld() can't be used in the same program;
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116 instead, you have to use dyld, which is mostly unimplemented. */
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117 {
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118 NSObjectFileImageReturnCode rc;
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119 NSObjectFileImage image;
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120 NSModule newModule;
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121 NSSymbol theSym;
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122 const char *errString;
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123
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124 if (NSIsSymbolNameDefined(funcname)) {
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125 theSym = NSLookupAndBindSymbol(funcname);
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126 p = (dl_funcptr)NSAddressOfSymbol(theSym);
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127 return p;
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128 }
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129 rc = NSCreateObjectFileImageFromFile(pathname, &image);
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130 switch(rc) {
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131 default:
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132 case NSObjectFileImageFailure:
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133 case NSObjectFileImageFormat:
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134 /* for these a message is printed on stderr by dyld */
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135 errString = "Can't create object file image";
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136 break;
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137 case NSObjectFileImageSuccess:
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138 errString = NULL;
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139 break;
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140 case NSObjectFileImageInappropriateFile:
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141 errString = "Inappropriate file type for dynamic loading";
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142 break;
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143 case NSObjectFileImageArch:
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144 errString = "Wrong CPU type in object file";
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145 break;
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146 case NSObjectFileImageAccess:
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147 errString = "Can't read object file (no access)";
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148 break;
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149 }
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150 if (errString == NULL) {
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151 newModule = NSLinkModule(image, pathname, TRUE);
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152 if (!newModule)
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153 errString = "Failure linking new module";
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154 }
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155 if (errString != NULL) {
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156 PyErr_SetString(PyExc_ImportError, errString);
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157 return NULL;
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158 }
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159 if (!NSIsSymbolNameDefined(funcname)) {
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160 /* UnlinkModule() isn't implemented in current versions, but calling it does no harm */
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161 NSUnLinkModule(newModule, FALSE);
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162 PyErr_Format(PyExc_ImportError,
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163 "Loaded module does not contain symbol %.200s",
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164 funcname);
11599
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165 return NULL;
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166 }
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167 theSym = NSLookupAndBindSymbol(funcname);
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168 p = (dl_funcptr)NSAddressOfSymbol(theSym);
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169 }
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170 #endif /* USE_DYLD */
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171
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172 return p;
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173 }