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annotate Python/importdl.c @ 69110:110bb604bc2f

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#11282: merge with 3.2.
author Ezio Melotti
date Sun, 03 Apr 2011 17:39:19 +0300
parents ef2b6305d395
children 1b7f484bab6e
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1
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2 /* Support for dynamic loading of extension modules */
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3
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4 #include "Python.h"
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5
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6 /* ./configure sets HAVE_DYNAMIC_LOADING if dynamic loading of modules is
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7 supported on this platform. configure will then compile and link in one
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8 of the dynload_*.c files, as appropriate. We will call a function in
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9 those modules to get a function pointer to the module's init function.
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10 */
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11 #ifdef HAVE_DYNAMIC_LOADING
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13 #include "importdl.h"
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14
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15 extern dl_funcptr _PyImport_GetDynLoadFunc(const char *shortname,
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16 const char *pathname, FILE *fp);
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18 /* name should be ASCII only because the C language doesn't accept non-ASCII
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19 identifiers, and dynamic modules are written in C. */
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21 PyObject *
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22 _PyImport_LoadDynamicModule(PyObject *name, PyObject *path, FILE *fp)
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23 {
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24 PyObject *m;
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25 PyObject *pathbytes;
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26 char *namestr, *lastdot, *shortname, *packagecontext, *oldcontext;
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27 dl_funcptr p0;
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28 PyObject* (*p)(void);
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29 struct PyModuleDef *def;
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31 namestr = _PyUnicode_AsString(name);
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32 if (namestr == NULL)
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33 return NULL;
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34
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35 m = _PyImport_FindExtensionObject(name, path);
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36 if (m != NULL) {
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37 Py_INCREF(m);
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38 return m;
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39 }
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41 lastdot = strrchr(namestr, '.');
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42 if (lastdot == NULL) {
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43 packagecontext = NULL;
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44 shortname = namestr;
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45 }
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46 else {
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47 packagecontext = namestr;
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48 shortname = lastdot+1;
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49 }
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50
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51 pathbytes = PyUnicode_EncodeFSDefault(path);
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52 if (pathbytes == NULL)
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53 return NULL;
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54 p0 = _PyImport_GetDynLoadFunc(shortname,
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55 PyBytes_AS_STRING(pathbytes), fp);
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56 Py_DECREF(pathbytes);
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57 p = (PyObject*(*)(void))p0;
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58 if (PyErr_Occurred())
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59 return NULL;
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60 if (p == NULL) {
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61 PyErr_Format(PyExc_ImportError,
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62 "dynamic module does not define init function"
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63 " (PyInit_%s)",
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64 shortname);
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65 return NULL;
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66 }
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67 oldcontext = _Py_PackageContext;
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68 _Py_PackageContext = packagecontext;
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69 m = (*p)();
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70 _Py_PackageContext = oldcontext;
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71 if (m == NULL)
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72 return NULL;
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73
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74 if (PyErr_Occurred()) {
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75 Py_DECREF(m);
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76 PyErr_Format(PyExc_SystemError,
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77 "initialization of %s raised unreported exception",
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78 shortname);
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79 return NULL;
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80 }
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81
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82 /* Remember pointer to module init function. */
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83 def = PyModule_GetDef(m);
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84 def->m_base.m_init = p;
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85
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86 /* Remember the filename as the __file__ attribute */
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87 if (PyModule_AddObject(m, "__file__", path) < 0)
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88 PyErr_Clear(); /* Not important enough to report */
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89 else
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90 Py_INCREF(path);
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91
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92 if (_PyImport_FixupExtensionObject(m, name, path) < 0)
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93 return NULL;
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94 if (Py_VerboseFlag)
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95 PySys_FormatStderr(
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96 "import %U # dynamically loaded from %R\n",
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97 name, path);
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98 return m;
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99 }
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100
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101 #endif /* HAVE_DYNAMIC_LOADING */