| 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 | }
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