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annotate Python/importdl.c @ 68565:db6997fb4c99

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Issue 11510: Fix BUILD_SET optimizer bug.
author Raymond Hettinger <python@rcn.com>
date Tue, 15 Mar 2011 15:03:36 -0700
parents 0874698b1201
children 2425717c6430
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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12
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13 #include "importdl.h"
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14
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0874698b1201 Issue #3080: Remove unused argument of _PyImport_GetDynLoadFunc()
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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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17
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18
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19
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20 PyObject *
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21 _PyImport_LoadDynamicModule(char *name, char *pathname, FILE *fp)
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22 {
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23 PyObject *m;
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24 PyObject *path;
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25 char *lastdot, *shortname, *packagecontext, *oldcontext;
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26 dl_funcptr p0;
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27 PyObject* (*p)(void);
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28 struct PyModuleDef *def;
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29 PyObject *result;
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30
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31 path = PyUnicode_DecodeFSDefault(pathname);
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32 if (path == NULL)
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33 return NULL;
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34
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35 if ((m = _PyImport_FindExtensionUnicode(name, path)) != NULL) {
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36 Py_INCREF(m);
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37 result = m;
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38 goto finally;
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39 }
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40 lastdot = strrchr(name, '.');
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41 if (lastdot == NULL) {
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42 packagecontext = NULL;
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43 shortname = name;
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44 }
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45 else {
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46 packagecontext = name;
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47 shortname = lastdot+1;
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48 }
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49
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50 p0 = _PyImport_GetDynLoadFunc(shortname, pathname, fp);
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51 p = (PyObject*(*)(void))p0;
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52 if (PyErr_Occurred())
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53 goto error;
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54 if (p == NULL) {
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55 PyErr_Format(PyExc_ImportError,
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56 "dynamic module does not define init function (PyInit_%.200s)",
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57 shortname);
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58 goto error;
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59 }
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60 oldcontext = _Py_PackageContext;
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61 _Py_PackageContext = packagecontext;
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62 m = (*p)();
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63 _Py_PackageContext = oldcontext;
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64 if (m == NULL)
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65 goto error;
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66
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67 if (PyErr_Occurred()) {
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68 Py_DECREF(m);
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69 PyErr_Format(PyExc_SystemError,
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70 "initialization of %s raised unreported exception",
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71 shortname);
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72 goto error;
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73 }
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74
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75 /* Remember pointer to module init function. */
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76 def = PyModule_GetDef(m);
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77 def->m_base.m_init = p;
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78
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79 /* Remember the filename as the __file__ attribute */
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80 if (PyModule_AddObject(m, "__file__", path) < 0)
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81 PyErr_Clear(); /* Not important enough to report */
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82 else
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83 Py_INCREF(path);
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84
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85 if (_PyImport_FixupExtensionUnicode(m, name, path) < 0)
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86 goto error;
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87 if (Py_VerboseFlag)
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88 PySys_WriteStderr(
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89 "import %s # dynamically loaded from %s\n",
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90 name, pathname);
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91 result = m;
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92 goto finally;
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93
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94 error:
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95 result = NULL;
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96 finally:
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97 Py_DECREF(path);
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98 return result;
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99 }
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100
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101 #endif /* HAVE_DYNAMIC_LOADING */