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| 1 | |||
| 2 | /* Support for dynamic loading of extension modules on Mac OS X | ||
| 3 | ** All references to "NeXT" are for historical reasons. | ||
| 4 | */ | ||
| 5 | |||
| 6 | #include "Python.h" | ||
| 7 | #include "importdl.h" | ||
| 8 | |||
| 9 | #include <mach-o/dyld.h> | ||
| 10 | |||
| 11 | const struct filedescr _PyImport_DynLoadFiletab[] = { | ||
| 12 | {".so", "rb", C_EXTENSION}, | ||
| 13 | {"module.so", "rb", C_EXTENSION}, | ||
| 14 | {0, 0} | ||
| 15 | }; | ||
| 16 | |||
| 17 | /* | ||
| 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 | ||
| 25 | ** you get. | ||
| 26 | */ | ||
| 27 | |||
| 28 | #ifdef USE_DYLD_GLOBAL_NAMESPACE | ||
| 29 | #define LINKOPTIONS NSLINKMODULE_OPTION_BINDNOW|NSLINKMODULE_OPTION_RETURN_ON_ERROR | ||
| 30 | #else | ||
| 31 | #define LINKOPTIONS NSLINKMODULE_OPTION_BINDNOW| \ | ||
| 32 | NSLINKMODULE_OPTION_RETURN_ON_ERROR|NSLINKMODULE_OPTION_PRIVATE | ||
| 33 | #endif | ||
| 34 | dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname, | ||
| 35 | const char *pathname, FILE *fp) | ||
| 36 | { | ||
| 37 | dl_funcptr p = NULL; | ||
| 38 | char funcname[258]; | ||
| 39 | NSObjectFileImageReturnCode rc; | ||
| 40 | NSObjectFileImage image; | ||
| 41 | NSModule newModule; | ||
| 42 | NSSymbol theSym; | ||
| 43 | const char *errString; | ||
| 44 | char errBuf[512]; | ||
| 45 | |||
| 46 | PyOS_snprintf(funcname, sizeof(funcname), "_init%.200s", shortname); | ||
| 47 | |||
| 48 | #ifdef USE_DYLD_GLOBAL_NAMESPACE | ||
| 49 | if (NSIsSymbolNameDefined(funcname)) { | ||
| 50 | theSym = NSLookupAndBindSymbol(funcname); | ||
| 51 | p = (dl_funcptr)NSAddressOfSymbol(theSym); | ||
| 52 | return p; | ||
| 53 | } | ||
| 54 | #endif | ||
| 55 | rc = NSCreateObjectFileImageFromFile(pathname, &image); | ||
| 56 | switch(rc) { | ||
| 57 | default: | ||
| 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"; | ||
| 62 | break; | ||
| 63 | case NSObjectFileImageSuccess: | ||
| 64 | errString = NULL; | ||
| 65 | break; | ||
| 66 | case NSObjectFileImageInappropriateFile: | ||
| 67 | errString = "Inappropriate file type for dynamic loading"; | ||
| 68 | break; | ||
| 69 | case NSObjectFileImageArch: | ||
| 70 | errString = "Wrong CPU type in object file"; | ||
| 71 | break; | ||
| 72 | case NSObjectFileImageAccess: | ||
| 73 | errString = "Can't read object file (no access)"; | ||
| 74 | break; | ||
| 75 | } | ||
| 76 | if (errString == NULL) { | ||
| 77 | newModule = NSLinkModule(image, pathname, LINKOPTIONS); | ||
| 78 | if (newModule == NULL) { | ||
| 79 | int errNo; | ||
| 80 | const char *fileName, *moreErrorStr; | ||
| 81 | NSLinkEditErrors c; | ||
| 82 | NSLinkEditError( &c, &errNo, &fileName, &moreErrorStr ); | ||
| 83 | PyOS_snprintf(errBuf, 512, "Failure linking new module: %s: %s", | ||
| 84 | fileName, moreErrorStr); | ||
| 85 | errString = errBuf; | ||
| 86 | } | ||
| 87 | } | ||
| 88 | if (errString != NULL) { | ||
| 89 | PyErr_SetString(PyExc_ImportError, errString); | ||
| 90 | return NULL; | ||
| 91 | } | ||
| 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", | ||
| 98 | funcname); | ||
| 99 | return NULL; | ||
| 100 | } | ||
| 101 | theSym = NSLookupAndBindSymbol(funcname); | ||
| 102 | #else | ||
| 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", | ||
| 108 | funcname); | ||
| 109 | return NULL; | ||
| 110 | } | ||
| 111 | #endif | ||
| 112 | p = (dl_funcptr)NSAddressOfSymbol(theSym); | ||
| 113 | return p; | ||
| 114 | } | ||