2 /* Support for dynamic loading of extension modules on Mac OS X
3 ** All references to "NeXT" are for historical reasons.
9 #include <mach-o/dyld.h>
11 const struct filedescr _PyImport_DynLoadFiletab[] = {
12 {".so", "rb", C_EXTENSION},
13 {"module.so", "rb", C_EXTENSION},
18 ** Python modules are Mach-O MH_BUNDLE files. The best way to load these
19 ** is each in a private namespace, so you can load, say, a module bar and a
20 ** module foo.bar. If we load everything in the global namespace the two
21 ** initbar() symbols will conflict.
22 ** However, it seems some extension packages depend upon being able to access
23 ** each others' global symbols. There seems to be no way to eat our cake and
24 ** have it, so the USE_DYLD_GLOBAL_NAMESPACE define determines which behaviour
28 #ifdef USE_DYLD_GLOBAL_NAMESPACE
29 #define LINKOPTIONS NSLINKMODULE_OPTION_BINDNOW|NSLINKMODULE_OPTION_RETURN_ON_ERROR
31 #define LINKOPTIONS NSLINKMODULE_OPTION_BINDNOW| \
32 NSLINKMODULE_OPTION_RETURN_ON_ERROR|NSLINKMODULE_OPTION_PRIVATE
34 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
35 const char *pathname, FILE *fp)
39 NSObjectFileImageReturnCode rc;
40 NSObjectFileImage image;
43 const char *errString;
46 PyOS_snprintf(funcname, sizeof(funcname), "_init%.200s", shortname);
48 #ifdef USE_DYLD_GLOBAL_NAMESPACE
49 if (NSIsSymbolNameDefined(funcname)) {
50 theSym = NSLookupAndBindSymbol(funcname);
51 p = (dl_funcptr)NSAddressOfSymbol(theSym);
55 rc = NSCreateObjectFileImageFromFile(pathname, &image);
58 case NSObjectFileImageFailure:
59 case NSObjectFileImageFormat:
60 /* for these a message is printed on stderr by dyld */
61 errString = "Can't create object file image";
63 case NSObjectFileImageSuccess:
66 case NSObjectFileImageInappropriateFile:
67 errString = "Inappropriate file type for dynamic loading";
69 case NSObjectFileImageArch:
70 errString = "Wrong CPU type in object file";
72 case NSObjectFileImageAccess:
73 errString = "Can't read object file (no access)";
76 if (errString == NULL) {
77 newModule = NSLinkModule(image, pathname, LINKOPTIONS);
78 if (newModule == NULL) {
80 const char *fileName, *moreErrorStr;
82 NSLinkEditError( &c, &errNo, &fileName, &moreErrorStr );
83 PyOS_snprintf(errBuf, 512, "Failure linking new module: %s: %s",
84 fileName, moreErrorStr);
88 if (errString != NULL) {
89 PyErr_SetString(PyExc_ImportError, errString);
92 #ifdef USE_DYLD_GLOBAL_NAMESPACE
93 if (!NSIsSymbolNameDefined(funcname)) {
94 /* UnlinkModule() isn't implemented in current versions, but calling it does no harm */
95 /* NSUnLinkModule(newModule, FALSE); removed: causes problems for ObjC code */
96 PyErr_Format(PyExc_ImportError,
97 "Loaded module does not contain symbol %.200s",
101 theSym = NSLookupAndBindSymbol(funcname);
103 theSym = NSLookupSymbolInModule(newModule, funcname);
104 if ( theSym == NULL ) {
105 /* NSUnLinkModule(newModule, FALSE); removed: causes problems for ObjC code */
106 PyErr_Format(PyExc_ImportError,
107 "Loaded module does not contain symbol %.200s",
112 p = (dl_funcptr)NSAddressOfSymbol(theSym);