Mercurial > cpython-lru_cache-weakref

annotate Python/dynload_next.c @ 68239:ceec209b26d4 2.4

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Close 2.4 branch.
author Georg Brandl <georg@python.org>
date Sat, 05 Mar 2011 14:56:41 +0100
parents f08529879db1
children fd25030223b0 94f64f11fdd0
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1
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2 /* Support for dynamic loading of extension modules on Mac OS X
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3 ** All references to "NeXT" are for historical reasons.
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4 */
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5
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6 #include "Python.h"
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7 #include "importdl.h"
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8
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9 #include <mach-o/dyld.h>
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10
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11 const struct filedescr _PyImport_DynLoadFiletab[] = {
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12 {".so", "rb", C_EXTENSION},
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13 {"module.so", "rb", C_EXTENSION},
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14 {0, 0}
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15 };
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16
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17 /*
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18 ** Python modules are Mach-O MH_BUNDLE files. The best way to load these
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19 ** is each in a private namespace, so you can load, say, a module bar and a
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20 ** module foo.bar. If we load everything in the global namespace the two
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21 ** initbar() symbols will conflict.
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22 ** However, it seems some extension packages depend upon being able to access
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23 ** each others' global symbols. There seems to be no way to eat our cake and
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24 ** have it, so the USE_DYLD_GLOBAL_NAMESPACE define determines which behaviour
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25 ** you get.
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26 */
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27
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28 #ifdef USE_DYLD_GLOBAL_NAMESPACE
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29 #define LINKOPTIONS NSLINKMODULE_OPTION_BINDNOW|NSLINKMODULE_OPTION_RETURN_ON_ERROR
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30 #else
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31 #define LINKOPTIONS NSLINKMODULE_OPTION_BINDNOW| \
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32 NSLINKMODULE_OPTION_RETURN_ON_ERROR|NSLINKMODULE_OPTION_PRIVATE
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33 #endif
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34 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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35 const char *pathname, FILE *fp)
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36 {
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37 dl_funcptr p = NULL;
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38 char funcname[258];
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39 NSObjectFileImageReturnCode rc;
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40 NSObjectFileImage image;
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41 NSModule newModule;
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42 NSSymbol theSym;
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43 const char *errString;
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44 char errBuf[512];
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45
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46 PyOS_snprintf(funcname, sizeof(funcname), "_init%.200s", shortname);
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47
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48 #ifdef USE_DYLD_GLOBAL_NAMESPACE
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49 if (NSIsSymbolNameDefined(funcname)) {
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50 theSym = NSLookupAndBindSymbol(funcname);
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51 p = (dl_funcptr)NSAddressOfSymbol(theSym);
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52 return p;
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53 }
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54 #endif
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55 rc = NSCreateObjectFileImageFromFile(pathname, &image);
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56 switch(rc) {
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57 default:
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58 case NSObjectFileImageFailure:
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59 case NSObjectFileImageFormat:
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60 /* for these a message is printed on stderr by dyld */
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61 errString = "Can't create object file image";
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62 break;
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63 case NSObjectFileImageSuccess:
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64 errString = NULL;
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65 break;
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66 case NSObjectFileImageInappropriateFile:
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67 errString = "Inappropriate file type for dynamic loading";
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68 break;
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69 case NSObjectFileImageArch:
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70 errString = "Wrong CPU type in object file";
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71 break;
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72 case NSObjectFileImageAccess:
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73 errString = "Can't read object file (no access)";
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74 break;
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75 }
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76 if (errString == NULL) {
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77 newModule = NSLinkModule(image, pathname, LINKOPTIONS);
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78 if (newModule == NULL) {
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79 int errNo;
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80 const char *fileName, *moreErrorStr;
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81 NSLinkEditErrors c;
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82 NSLinkEditError( &c, &errNo, &fileName, &moreErrorStr );
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83 PyOS_snprintf(errBuf, 512, "Failure linking new module: %s: %s",
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84 fileName, moreErrorStr);
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85 errString = errBuf;
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86 }
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87 }
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88 if (errString != NULL) {
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89 PyErr_SetString(PyExc_ImportError, errString);
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90 return NULL;
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91 }
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92 #ifdef USE_DYLD_GLOBAL_NAMESPACE
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93 if (!NSIsSymbolNameDefined(funcname)) {
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94 /* UnlinkModule() isn't implemented in current versions, but calling it does no harm */
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95 /* NSUnLinkModule(newModule, FALSE); removed: causes problems for ObjC code */
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96 PyErr_Format(PyExc_ImportError,
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97 "Loaded module does not contain symbol %.200s",
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98 funcname);
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99 return NULL;
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100 }
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101 theSym = NSLookupAndBindSymbol(funcname);
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102 #else
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103 theSym = NSLookupSymbolInModule(newModule, funcname);
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104 if ( theSym == NULL ) {
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105 /* NSUnLinkModule(newModule, FALSE); removed: causes problems for ObjC code */
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106 PyErr_Format(PyExc_ImportError,
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107 "Loaded module does not contain symbol %.200s",
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108 funcname);
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109 return NULL;
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110 }
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111 #endif
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112 p = (dl_funcptr)NSAddressOfSymbol(theSym);
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113 return p;
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114 }