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127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
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/* Support for dynamic loading of extension modules */
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#include "Python.h"
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/* ./configure sets HAVE_DYNAMIC_LOADING if dynamic loading of modules is
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supported on this platform. configure will then compile and link in one
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of the dynload_*.c files, as appropriate. We will call a function in
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those modules to get a function pointer to the module's init function.
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*/
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#ifdef HAVE_DYNAMIC_LOADING
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#include "importdl.h"
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#ifdef MS_WINDOWS
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extern dl_funcptr _PyImport_GetDynLoadWindows(const char *shortname,
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PyObject *pathname, FILE *fp);
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#else
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extern dl_funcptr _PyImport_GetDynLoadFunc(const char *shortname,
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const char *pathname, FILE *fp);
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#endif
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PyObject *
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_PyImport_LoadDynamicModule(PyObject *name, PyObject *path, FILE *fp)
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{
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PyObject *m = NULL;
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#ifndef MS_WINDOWS
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PyObject *pathbytes;
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#endif
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PyObject *nameascii;
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char *namestr, *lastdot, *shortname, *packagecontext, *oldcontext;
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dl_funcptr p0;
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PyObject* (*p)(void);
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struct PyModuleDef *def;
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m = _PyImport_FindExtensionObject(name, path);
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if (m != NULL) {
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Py_INCREF(m);
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return m;
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}
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/* name must be encodable to ASCII because dynamic module must have a
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function called "PyInit_NAME", they are written in C, and the C language
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doesn't accept non-ASCII identifiers. */
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nameascii = PyUnicode_AsEncodedString(name, "ascii", NULL);
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if (nameascii == NULL)
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return NULL;
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namestr = PyBytes_AS_STRING(nameascii);
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if (namestr == NULL)
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goto error;
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lastdot = strrchr(namestr, '.');
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if (lastdot == NULL) {
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packagecontext = NULL;
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shortname = namestr;
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}
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else {
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packagecontext = namestr;
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shortname = lastdot+1;
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}
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#ifdef MS_WINDOWS
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p0 = _PyImport_GetDynLoadWindows(shortname, path, fp);
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#else
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pathbytes = PyUnicode_EncodeFSDefault(path);
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if (pathbytes == NULL)
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goto error;
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p0 = _PyImport_GetDynLoadFunc(shortname,
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PyBytes_AS_STRING(pathbytes), fp);
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Py_DECREF(pathbytes);
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#endif
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p = (PyObject*(*)(void))p0;
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if (PyErr_Occurred())
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goto error;
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if (p == NULL) {
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PyObject *msg = PyUnicode_FromFormat("dynamic module does not define "
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"init function (PyInit_%s)",
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shortname);
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if (msg == NULL)
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goto error;
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PyErr_SetImportError(msg, name, path);
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Py_DECREF(msg);
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goto error;
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}
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oldcontext = _Py_PackageContext;
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_Py_PackageContext = packagecontext;
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m = (*p)();
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_Py_PackageContext = oldcontext;
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if (m == NULL)
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goto error;
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if (PyErr_Occurred()) {
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PyErr_Format(PyExc_SystemError,
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"initialization of %s raised unreported exception",
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shortname);
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goto error;
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}
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/* Remember pointer to module init function. */
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def = PyModule_GetDef(m);
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if (def == NULL) {
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PyErr_Format(PyExc_SystemError,
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"initialization of %s did not return an extension "
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"module", shortname);
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goto error;
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}
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def->m_base.m_init = p;
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/* Remember the filename as the __file__ attribute */
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if (PyModule_AddObject(m, "__file__", path) < 0)
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PyErr_Clear(); /* Not important enough to report */
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else
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Py_INCREF(path);
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if (_PyImport_FixupExtensionObject(m, name, path) < 0)
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goto error;
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Py_DECREF(nameascii);
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return m;
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error:
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Py_DECREF(nameascii);
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Py_XDECREF(m);
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return NULL;
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}
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#endif /* HAVE_DYNAMIC_LOADING */
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