Mercurial > cpython-lru_cache-weakref

annotate Python/importdl.c @ 74510:c19b0ae5cd91

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Finally fix all test_capi refleaks
author Antoine Pitrou <solipsis@pitrou.net>
date Wed, 18 Jan 2012 21:45:15 +0100
parents eb003c3d1770
children 2dd046be2c88
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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15 #ifdef MS_WINDOWS
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16 extern dl_funcptr _PyImport_GetDynLoadWindows(const char *shortname,
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17 PyObject *pathname, FILE *fp);
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18 #else
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19 extern dl_funcptr _PyImport_GetDynLoadFunc(const char *shortname,
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20 const char *pathname, FILE *fp);
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21 #endif
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22
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23 PyObject *
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24 _PyImport_LoadDynamicModule(PyObject *name, PyObject *path, FILE *fp)
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25 {
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26 PyObject *m = NULL;
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27 #ifndef MS_WINDOWS
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28 PyObject *pathbytes;
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29 #endif
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30 PyObject *nameascii;
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31 char *namestr, *lastdot, *shortname, *packagecontext, *oldcontext;
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32 dl_funcptr p0;
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33 PyObject* (*p)(void);
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34 struct PyModuleDef *def;
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35
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36 m = _PyImport_FindExtensionObject(name, path);
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37 if (m != NULL) {
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38 Py_INCREF(m);
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39 return m;
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40 }
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41
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42 /* name must be encodable to ASCII because dynamic module must have a
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43 function called "PyInit_NAME", they are written in C, and the C language
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44 doesn't accept non-ASCII identifiers. */
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45 nameascii = PyUnicode_AsEncodedString(name, "ascii", NULL);
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46 if (nameascii == NULL)
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47 return NULL;
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48
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49 namestr = PyBytes_AS_STRING(nameascii);
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50 if (namestr == NULL)
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51 goto error;
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52
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53 lastdot = strrchr(namestr, '.');
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54 if (lastdot == NULL) {
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55 packagecontext = NULL;
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56 shortname = namestr;
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57 }
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58 else {
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59 packagecontext = namestr;
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60 shortname = lastdot+1;
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61 }
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62
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63 #ifdef MS_WINDOWS
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64 p0 = _PyImport_GetDynLoadWindows(shortname, path, fp);
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65 #else
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66 pathbytes = PyUnicode_EncodeFSDefault(path);
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67 if (pathbytes == NULL)
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68 goto error;
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69 p0 = _PyImport_GetDynLoadFunc(shortname,
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70 PyBytes_AS_STRING(pathbytes), fp);
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71 Py_DECREF(pathbytes);
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72 #endif
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73 p = (PyObject*(*)(void))p0;
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74 if (PyErr_Occurred())
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75 goto error;
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76 if (p == NULL) {
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77 PyErr_Format(PyExc_ImportError,
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78 "dynamic module does not define init function"
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79 " (PyInit_%s)",
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80 shortname);
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81 goto error;
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82 }
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83 oldcontext = _Py_PackageContext;
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84 _Py_PackageContext = packagecontext;
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85 m = (*p)();
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86 _Py_PackageContext = oldcontext;
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87 if (m == NULL)
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88 goto error;
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89
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90 if (PyErr_Occurred()) {
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91 PyErr_Format(PyExc_SystemError,
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92 "initialization of %s raised unreported exception",
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93 shortname);
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94 goto error;
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95 }
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96
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97 /* Remember pointer to module init function. */
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98 def = PyModule_GetDef(m);
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99 def->m_base.m_init = p;
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100
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101 /* Remember the filename as the __file__ attribute */
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102 if (PyModule_AddObject(m, "__file__", path) < 0)
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103 PyErr_Clear(); /* Not important enough to report */
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104 else
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105 Py_INCREF(path);
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106
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107 if (_PyImport_FixupExtensionObject(m, name, path) < 0)
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108 goto error;
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109 if (Py_VerboseFlag)
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110 PySys_FormatStderr(
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111 "import %U # dynamically loaded from %R\n",
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112 name, path);
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113 Py_DECREF(nameascii);
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114 return m;
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115
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116 error:
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117 Py_DECREF(nameascii);
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118 Py_XDECREF(m);
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119 return NULL;
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120 }
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121
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122 #endif /* HAVE_DYNAMIC_LOADING */