Mercurial > cpython-lru_cache-weakref

annotate Python/dynload_next.c @ 11600:14561e8395bb legacy-trunk

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Moved most of the platform-specific code to dynload_<platform>.c files. (A few nite remain, these will probably disappear soon.) This is part of a set of patches by Greg Stein.
author Guido van Rossum <guido@python.org>
date Mon, 20 Dec 1999 21:20:42 +0000
parents 78fe87ce0ded
children 528559a0b2f2
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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 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* Support for dynamic loading of extension modules */
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33
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34 #include "Python.h"
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35 #include "importdl.h"
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36
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37
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38 #ifdef WITH_DYLD
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39
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40 #define USE_DYLD
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41
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42 #include <mach-o/dyld.h>
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43
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44 #else /* WITH_DYLD */
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45
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46 #define USE_RLD
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47 /* Define this to 1 if you want be able to load ObjC modules as well:
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48 it switches between two different way of loading modules on the NeXT,
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49 one that directly interfaces with the dynamic loader (rld_load(), which
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50 does not correctly load ObjC object files), and another that uses the
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51 ObjC runtime (objc_loadModules()) to do the job.
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52 You'll have to add ``-ObjC'' to the compiler flags if you set this to 1.
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53 */
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54 #define HANDLE_OBJC_MODULES 1
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55 #if HANDLE_OBJC_MODULES
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56 #include <objc/Object.h>
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57 #include <objc/objc-load.h>
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58 #endif
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59
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60 #include <mach-o/rld.h>
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61
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62 #endif /* WITH_DYLD */
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63
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64
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65 const struct filedescr _PyImport_DynLoadFiletab[] = {
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66 {".so", "rb", C_EXTENSION},
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67 {"module.so", "rb", C_EXTENSION},
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68 {0, 0}
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69 };
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70
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71 dl_funcptr _PyImport_GetDynLoadFunc(const char *name, const char *funcname,
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72 const char *pathname, FILE *fp)
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73 {
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74 dl_funcptr p = NULL;
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75
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76 #ifdef USE_RLD
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77 {
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78 NXStream *errorStream;
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79 struct mach_header *new_header;
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80 const char *filenames[2];
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81 long ret;
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82 unsigned long ptr;
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83
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84 errorStream = NXOpenMemory(NULL, 0, NX_WRITEONLY);
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85 filenames[0] = pathname;
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86 filenames[1] = NULL;
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87
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88 #if HANDLE_OBJC_MODULES
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89
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90 /* The following very bogus line of code ensures that
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91 objc_msgSend, etc are linked into the binary. Without
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92 it, dynamic loading of a module that includes objective-c
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93 method calls will fail with "undefined symbol _objc_msgSend()".
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94 This remains true even in the presence of the -ObjC flag
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95 to the compiler
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96 */
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97
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98 [Object name];
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99
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100 /* objc_loadModules() dynamically loads the object files
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101 indicated by the paths in filenames. If there are any
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102 errors generated during loading -- typically due to the
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103 inability to find particular symbols -- an error message
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104 will be written to errorStream.
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105 It returns 0 if the module is successfully loaded, 1
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106 otherwise.
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107 */
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108
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109 ret = !objc_loadModules(filenames, errorStream,
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110 NULL, &new_header, NULL);
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111
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112 #else /* !HANDLE_OBJC_MODULES */
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113
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114 ret = rld_load(errorStream, &new_header,
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115 filenames, NULL);
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116
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117 #endif /* HANDLE_OBJC_MODULES */
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118
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119 /* extract the error messages for the exception */
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120 if(!ret) {
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121 char *streamBuf;
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122 int len, maxLen;
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123
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124 NXPutc(errorStream, (char)0);
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125
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126 NXGetMemoryBuffer(errorStream,
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127 &streamBuf, &len, &maxLen);
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128 PyErr_SetString(PyExc_ImportError, streamBuf);
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129 }
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130
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131 if(ret && rld_lookup(errorStream, funcname, &ptr))
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132 p = (dl_funcptr) ptr;
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133
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134 NXCloseMemory(errorStream, NX_FREEBUFFER);
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135
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136 if(!ret)
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137 return NULL;
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138 }
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139 #endif /* USE_RLD */
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140 #ifdef USE_DYLD
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141 /* This is also NeXT-specific. However, frameworks (the new style
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142 of shared library) and rld() can't be used in the same program;
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143 instead, you have to use dyld, which is mostly unimplemented. */
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144 {
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145 NSObjectFileImageReturnCode rc;
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146 NSObjectFileImage image;
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147 NSModule newModule;
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148 NSSymbol theSym;
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149 void *symaddr;
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150 const char *errString;
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151
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152 rc = NSCreateObjectFileImageFromFile(pathname, &image);
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153 switch(rc) {
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154 default:
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155 case NSObjectFileImageFailure:
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156 NSObjectFileImageFormat:
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157 /* for these a message is printed on stderr by dyld */
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158 errString = "Can't create object file image";
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159 break;
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160 case NSObjectFileImageSuccess:
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161 errString = NULL;
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162 break;
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163 case NSObjectFileImageInappropriateFile:
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164 errString = "Inappropriate file type for dynamic loading";
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165 break;
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166 case NSObjectFileImageArch:
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167 errString = "Wrong CPU type in object file";
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168 break;
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169 NSObjectFileImageAccess:
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170 errString = "Can't read object file (no access)";
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171 break;
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172 }
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173 if (errString == NULL) {
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174 newModule = NSLinkModule(image, pathname, TRUE);
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175 if (!newModule)
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176 errString = "Failure linking new module";
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177 }
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178 if (errString != NULL) {
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179 PyErr_SetString(PyExc_ImportError, errString);
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180 return NULL;
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181 }
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182 if (!NSIsSymbolNameDefined(funcname)) {
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183 /* UnlinkModule() isn't implimented in current versions, but calling it does no harm */
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184 NSUnLinkModule(newModule, FALSE);
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185 PyErr_Format(PyExc_ImportError, "Loaded module does not contain symbol %s", funcname);
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186 return NULL;
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187 }
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188 theSym = NSLookupAndBindSymbol(funcname);
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189 p = (dl_funcptr)NSAddressOfSymbol(theSym);
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190 }
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191 #endif /* USE_DYLD */
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192
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193 return p;
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194 }