blob: 0b232f120614aa4c4c28690c3bbb886db11d1d16 [file] [log] [blame]
Guido van Rossum22a1d361999-12-20 21:18:49 +00001
Jack Jansend4c76bf2002-02-01 16:01:05 +00002/* Support for dynamic loading of extension modules on Mac OS X
3** All references to "NeXT" are for historical reasons.
4*/
Guido van Rossum22a1d361999-12-20 21:18:49 +00005
6#include "Python.h"
7#include "importdl.h"
8
Guido van Rossum22a1d361999-12-20 21:18:49 +00009#include <mach-o/dyld.h>
10
Guido van Rossum22a1d361999-12-20 21:18:49 +000011const struct filedescr _PyImport_DynLoadFiletab[] = {
12 {".so", "rb", C_EXTENSION},
13 {"module.so", "rb", C_EXTENSION},
14 {0, 0}
15};
16
Jack Jansend4c76bf2002-02-01 16:01:05 +000017/*
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
Guido van Rossum96a8fb71999-12-22 14:09:35 +000034dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
Jack Jansend4c76bf2002-02-01 16:01:05 +000035 const char *pathname, FILE *fp)
Guido van Rossum22a1d361999-12-20 21:18:49 +000036{
37 dl_funcptr p = NULL;
Guido van Rossum96a8fb71999-12-22 14:09:35 +000038 char funcname[258];
Jack Jansena762f4c2002-02-01 22:24:56 +000039 NSObjectFileImageReturnCode rc;
40 NSObjectFileImage image;
41 NSModule newModule;
42 NSSymbol theSym;
43 const char *errString;
44 char errBuf[512];
Guido van Rossum96a8fb71999-12-22 14:09:35 +000045
Jeremy Hylton518ab1c2001-11-28 20:42:20 +000046 PyOS_snprintf(funcname, sizeof(funcname), "_init%.200s", shortname);
Guido van Rossum22a1d361999-12-20 21:18:49 +000047
Jack Jansend4c76bf2002-02-01 16:01:05 +000048#ifdef USE_DYLD_GLOBAL_NAMESPACE
Jack Jansena762f4c2002-02-01 22:24:56 +000049 if (NSIsSymbolNameDefined(funcname)) {
50 theSym = NSLookupAndBindSymbol(funcname);
51 p = (dl_funcptr)NSAddressOfSymbol(theSym);
52 return p;
53 }
Jack Jansend4c76bf2002-02-01 16:01:05 +000054#endif
Jack Jansena762f4c2002-02-01 22:24:56 +000055 rc = NSCreateObjectFileImageFromFile(pathname, &image);
56 switch(rc) {
57 default:
58 case NSObjectFileImageFailure:
59 case NSObjectFileImageFormat:
Jack Jansend4c76bf2002-02-01 16:01:05 +000060 /* for these a message is printed on stderr by dyld */
Guido van Rossum22a1d361999-12-20 21:18:49 +000061 errString = "Can't create object file image";
Jack Jansena762f4c2002-02-01 22:24:56 +000062 break;
63 case NSObjectFileImageSuccess:
Guido van Rossum22a1d361999-12-20 21:18:49 +000064 errString = NULL;
65 break;
Jack Jansena762f4c2002-02-01 22:24:56 +000066 case NSObjectFileImageInappropriateFile:
Guido van Rossum22a1d361999-12-20 21:18:49 +000067 errString = "Inappropriate file type for dynamic loading";
68 break;
Jack Jansena762f4c2002-02-01 22:24:56 +000069 case NSObjectFileImageArch:
Guido van Rossum22a1d361999-12-20 21:18:49 +000070 errString = "Wrong CPU type in object file";
71 break;
Jack Jansena762f4c2002-02-01 22:24:56 +000072 case NSObjectFileImageAccess:
Guido van Rossum22a1d361999-12-20 21:18:49 +000073 errString = "Can't read object file (no access)";
74 break;
Jack Jansend4c76bf2002-02-01 16:01:05 +000075 }
Jack Jansena762f4c2002-02-01 22:24:56 +000076 if (errString == NULL) {
77 newModule = NSLinkModule(image, pathname, LINKOPTIONS);
78 if (newModule == NULL) {
79 int errNo;
80 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);
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);
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);
Guido van Rossum22a1d361999-12-20 21:18:49 +0000113 return p;
114}