Mercurial > cpython-lru_cache-weakref

annotate Objects/moduleobject.c @ 65589:46bbbdcd777f

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Refactor interesting use of try-finally.
author Georg Brandl <georg@python.org>
date Fri, 22 Oct 2010 06:35:59 +0000
parents e2aa3b1d08bc
children 62b61abd02b8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
145
853b736a6a9e Added copyright notice.
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1
6
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2 /* Module object implementation */
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3
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4 #include "Python.h"
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5 #include "structmember.h"
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6
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7 static Py_ssize_t max_module_number;
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8
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9 typedef struct {
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10 PyObject_HEAD
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11 PyObject *md_dict;
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12 struct PyModuleDef *md_def;
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13 void *md_state;
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14 } PyModuleObject;
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15
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16 static PyMemberDef module_members[] = {
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17 {"__dict__", T_OBJECT, offsetof(PyModuleObject, md_dict), READONLY},
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18 {0}
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19 };
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20
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21 static PyTypeObject moduledef_type = {
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22 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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23 "moduledef", /* tp_name */
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24 sizeof(struct PyModuleDef), /* tp_size */
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25 0, /* tp_itemsize */
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26 };
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27
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28
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29 PyObject *
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30 PyModule_New(const char *name)
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31 {
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32 PyModuleObject *m;
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33 PyObject *nameobj;
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34 m = PyObject_GC_New(PyModuleObject, &PyModule_Type);
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35 if (m == NULL)
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36 return NULL;
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37 m->md_def = NULL;
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38 m->md_state = NULL;
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39 nameobj = PyUnicode_FromString(name);
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40 m->md_dict = PyDict_New();
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41 if (m->md_dict == NULL || nameobj == NULL)
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42 goto fail;
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43 if (PyDict_SetItemString(m->md_dict, "__name__", nameobj) != 0)
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44 goto fail;
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45 if (PyDict_SetItemString(m->md_dict, "__doc__", Py_None) != 0)
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46 goto fail;
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47 if (PyDict_SetItemString(m->md_dict, "__package__", Py_None) != 0)
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48 goto fail;
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49 Py_DECREF(nameobj);
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50 PyObject_GC_Track(m);
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51 return (PyObject *)m;
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52
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53 fail:
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54 Py_XDECREF(nameobj);
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55 Py_DECREF(m);
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56 return NULL;
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57 }
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58
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59 PyObject *
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60 PyModule_Create2(struct PyModuleDef* module, int module_api_version)
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61 {
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62 PyObject *d, *v, *n;
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63 PyMethodDef *ml;
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64 const char* name;
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65 PyModuleObject *m;
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66 if (!Py_IsInitialized())
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67 Py_FatalError("Interpreter not initialized (version mismatch?)");
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68 if (PyType_Ready(&moduledef_type) < 0)
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69 return NULL;
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70 if (module->m_base.m_index == 0) {
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71 max_module_number++;
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72 Py_REFCNT(module) = 1;
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73 Py_TYPE(module) = &moduledef_type;
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74 module->m_base.m_index = max_module_number;
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75 }
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76 name = module->m_name;
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77 if (module_api_version != PYTHON_API_VERSION) {
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78 int err;
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79 err = PyErr_WarnFormat(PyExc_RuntimeWarning, 1,
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80 "Python C API version mismatch for module %.100s: "
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81 "This Python has API version %d, module %.100s has version %d.",
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82 name,
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83 PYTHON_API_VERSION, name, module_api_version);
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84 if (err)
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85 return NULL;
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86 }
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87 /* Make sure name is fully qualified.
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88
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89 This is a bit of a hack: when the shared library is loaded,
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90 the module name is "package.module", but the module calls
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91 PyModule_Create*() with just "module" for the name. The shared
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92 library loader squirrels away the true name of the module in
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93 _Py_PackageContext, and PyModule_Create*() will substitute this
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94 (if the name actually matches).
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95 */
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96 if (_Py_PackageContext != NULL) {
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97 char *p = strrchr(_Py_PackageContext, '.');
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98 if (p != NULL && strcmp(module->m_name, p+1) == 0) {
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99 name = _Py_PackageContext;
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100 _Py_PackageContext = NULL;
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101 }
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102 }
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103 if ((m = (PyModuleObject*)PyModule_New(name)) == NULL)
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104 return NULL;
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105
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106 if (module->m_size > 0) {
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107 m->md_state = PyMem_MALLOC(module->m_size);
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108 if (!m->md_state) {
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109 PyErr_NoMemory();
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110 Py_DECREF(m);
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111 return NULL;
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112 }
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113 memset(m->md_state, 0, module->m_size);
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114 }
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115
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116 d = PyModule_GetDict((PyObject*)m);
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117 if (module->m_methods != NULL) {
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118 n = PyUnicode_FromString(name);
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119 if (n == NULL)
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120 return NULL;
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121 for (ml = module->m_methods; ml->ml_name != NULL; ml++) {
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122 if ((ml->ml_flags & METH_CLASS) ||
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123 (ml->ml_flags & METH_STATIC)) {
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124 PyErr_SetString(PyExc_ValueError,
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125 "module functions cannot set"
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126 " METH_CLASS or METH_STATIC");
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127 Py_DECREF(n);
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128 return NULL;
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129 }
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130 v = PyCFunction_NewEx(ml, (PyObject*)m, n);
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131 if (v == NULL) {
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132 Py_DECREF(n);
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133 return NULL;
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134 }
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135 if (PyDict_SetItemString(d, ml->ml_name, v) != 0) {
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136 Py_DECREF(v);
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137 Py_DECREF(n);
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138 return NULL;
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139 }
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140 Py_DECREF(v);
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141 }
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142 Py_DECREF(n);
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143 }
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144 if (module->m_doc != NULL) {
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145 v = PyUnicode_FromString(module->m_doc);
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146 if (v == NULL || PyDict_SetItemString(d, "__doc__", v) != 0) {
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147 Py_XDECREF(v);
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148 return NULL;
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149 }
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150 Py_DECREF(v);
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151 }
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152 m->md_def = module;
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153 return (PyObject*)m;
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154 }
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155
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156
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157 PyObject *
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158 PyModule_GetDict(PyObject *m)
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159 {
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160 PyObject *d;
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161 if (!PyModule_Check(m)) {
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162 PyErr_BadInternalCall();
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163 return NULL;
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164 }
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165 d = ((PyModuleObject *)m) -> md_dict;
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166 if (d == NULL)
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167 ((PyModuleObject *)m) -> md_dict = d = PyDict_New();
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168 return d;
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169 }
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170
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171 const char *
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172 PyModule_GetName(PyObject *m)
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173 {
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174 PyObject *d;
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175 PyObject *nameobj;
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176 if (!PyModule_Check(m)) {
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177 PyErr_BadArgument();
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178 return NULL;
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179 }
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180 d = ((PyModuleObject *)m)->md_dict;
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181 if (d == NULL ||
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182 (nameobj = PyDict_GetItemString(d, "__name__")) == NULL ||
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183 !PyUnicode_Check(nameobj))
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184 {
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185 PyErr_SetString(PyExc_SystemError, "nameless module");
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186 return NULL;
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187 }
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188 return _PyUnicode_AsString(nameobj);
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189 }
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190
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191 PyObject*
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192 PyModule_GetFilenameObject(PyObject *m)
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193 {
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194 PyObject *d;
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195 PyObject *fileobj;
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196 if (!PyModule_Check(m)) {
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197 PyErr_BadArgument();
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198 return NULL;
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199 }
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200 d = ((PyModuleObject *)m)->md_dict;
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201 if (d == NULL ||
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202 (fileobj = PyDict_GetItemString(d, "__file__")) == NULL ||
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203 !PyUnicode_Check(fileobj))
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204 {
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205 PyErr_SetString(PyExc_SystemError, "module filename missing");
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206 return NULL;
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207 }
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208 Py_INCREF(fileobj);
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209 return fileobj;
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210 }
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211
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212 const char *
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213 PyModule_GetFilename(PyObject *m)
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214 {
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215 PyObject *fileobj;
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216 char *utf8;
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217 fileobj = PyModule_GetFilenameObject(m);
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218 if (fileobj == NULL)
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219 return NULL;
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220 utf8 = _PyUnicode_AsString(fileobj);
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221 Py_DECREF(fileobj);
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222 return utf8;
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223 }
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224
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225 PyModuleDef*
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226 PyModule_GetDef(PyObject* m)
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227 {
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228 if (!PyModule_Check(m)) {
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229 PyErr_BadArgument();
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230 return NULL;
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231 }
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232 return ((PyModuleObject *)m)->md_def;
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233 }
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234
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235 void*
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236 PyModule_GetState(PyObject* m)
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237 {
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238 if (!PyModule_Check(m)) {
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239 PyErr_BadArgument();
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240 return NULL;
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241 }
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242 return ((PyModuleObject *)m)->md_state;
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243 }
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244
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245 void
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246 _PyModule_Clear(PyObject *m)
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247 {
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248 /* To make the execution order of destructors for global
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249 objects a bit more predictable, we first zap all objects
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250 whose name starts with a single underscore, before we clear
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251 the entire dictionary. We zap them by replacing them with
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252 None, rather than deleting them from the dictionary, to
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253 avoid rehashing the dictionary (to some extent). */
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254
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255 Py_ssize_t pos;
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256 PyObject *key, *value;
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257 PyObject *d;
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258
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259 d = ((PyModuleObject *)m)->md_dict;
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260 if (d == NULL)
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261 return;
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262
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263 /* First, clear only names starting with a single underscore */
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264 pos = 0;
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265 while (PyDict_Next(d, &pos, &key, &value)) {
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266 if (value != Py_None && PyUnicode_Check(key)) {
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267 Py_UNICODE *u = PyUnicode_AS_UNICODE(key);
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268 if (u[0] == '_' && u[1] != '_') {
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269 if (Py_VerboseFlag > 1) {
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270 const char *s = _PyUnicode_AsString(key);
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271 if (s != NULL)
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272 PySys_WriteStderr("# clear[1] %s\n", s);
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273 else
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274 PyErr_Clear();
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275 }
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276 PyDict_SetItem(d, key, Py_None);
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277 }
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278 }
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279 }
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280
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281 /* Next, clear all names except for __builtins__ */
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282 pos = 0;
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283 while (PyDict_Next(d, &pos, &key, &value)) {
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284 if (value != Py_None && PyUnicode_Check(key)) {
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285 Py_UNICODE *u = PyUnicode_AS_UNICODE(key);
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286 if (u[0] != '_'
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287 || PyUnicode_CompareWithASCIIString(key, "__builtins__") != 0)
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288 {
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289 if (Py_VerboseFlag > 1) {
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290 const char *s = _PyUnicode_AsString(key);
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291 if (s != NULL)
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292 PySys_WriteStderr("# clear[2] %s\n", s);
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293 else
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294 PyErr_Clear();
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295 }
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296 PyDict_SetItem(d, key, Py_None);
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297 }
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298 }
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299 }
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300
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301 /* Note: we leave __builtins__ in place, so that destructors
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302 of non-global objects defined in this module can still use
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303 builtins, in particularly 'None'. */
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304
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305 }
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306
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307 /* Methods */
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308
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309 static int
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310 module_init(PyModuleObject *m, PyObject *args, PyObject *kwds)
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311 {
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312 static char *kwlist[] = {"name", "doc", NULL};
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313 PyObject *dict, *name = Py_None, *doc = Py_None;
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314 if (!PyArg_ParseTupleAndKeywords(args, kwds, "U|O:module.__init__",
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315 kwlist, &name, &doc))
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316 return -1;
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317 dict = m->md_dict;
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318 if (dict == NULL) {
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319 dict = PyDict_New();
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320 if (dict == NULL)
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321 return -1;
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322 m->md_dict = dict;
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323 }
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324 if (PyDict_SetItemString(dict, "__name__", name) < 0)
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325 return -1;
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326 if (PyDict_SetItemString(dict, "__doc__", doc) < 0)
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327 return -1;
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328 return 0;
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329 }
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330
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331 static void
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332 module_dealloc(PyModuleObject *m)
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333 {
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334 PyObject_GC_UnTrack(m);
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335 if (m->md_def && m->md_def->m_free)
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336 m->md_def->m_free(m);
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337 if (m->md_dict != NULL) {
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338 _PyModule_Clear((PyObject *)m);
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339 Py_DECREF(m->md_dict);
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340 }
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341 if (m->md_state != NULL)
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342 PyMem_FREE(m->md_state);
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343 Py_TYPE(m)->tp_free((PyObject *)m);
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344 }
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345
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346 static PyObject *
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347 module_repr(PyModuleObject *m)
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348 {
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349 const char *name;
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350 PyObject *filename, *repr;
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351
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352 name = PyModule_GetName((PyObject *)m);
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353 if (name == NULL) {
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354 PyErr_Clear();
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355 name = "?";
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356 }
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357 filename = PyModule_GetFilenameObject((PyObject *)m);
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358 if (filename == NULL) {
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359 PyErr_Clear();
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360 return PyUnicode_FromFormat("<module '%s' (built-in)>", name);
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361 }
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362 repr = PyUnicode_FromFormat("<module '%s' from '%U'>", name, filename);
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363 Py_DECREF(filename);
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364 return repr;
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365 }
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366
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367 static int
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368 module_traverse(PyModuleObject *m, visitproc visit, void *arg)
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369 {
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370 if (m->md_def && m->md_def->m_traverse) {
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371 int res = m->md_def->m_traverse((PyObject*)m, visit, arg);
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372 if (res)
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373 return res;
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374 }
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375 Py_VISIT(m->md_dict);
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376 return 0;
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377 }
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378
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379 static int
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380 module_clear(PyModuleObject *m)
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381 {
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382 if (m->md_def && m->md_def->m_clear) {
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383 int res = m->md_def->m_clear((PyObject*)m);
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384 if (res)
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385 return res;
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386 }
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387 Py_CLEAR(m->md_dict);
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388 return 0;
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389 }
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390
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391
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392 PyDoc_STRVAR(module_doc,
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393 "module(name[, doc])\n\
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394 \n\
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395 Create a module object.\n\
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396 The name must be a string; the optional doc argument can have any type.");
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397
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398 PyTypeObject PyModule_Type = {
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399 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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400 "module", /* tp_name */
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401 sizeof(PyModuleObject), /* tp_size */
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402 0, /* tp_itemsize */
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403 (destructor)module_dealloc, /* tp_dealloc */
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404 0, /* tp_print */
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405 0, /* tp_getattr */
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406 0, /* tp_setattr */
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407 0, /* tp_reserved */
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408 (reprfunc)module_repr, /* tp_repr */
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409 0, /* tp_as_number */
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410 0, /* tp_as_sequence */
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411 0, /* tp_as_mapping */
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412 0, /* tp_hash */
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413 0, /* tp_call */
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414 0, /* tp_str */
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415 PyObject_GenericGetAttr, /* tp_getattro */
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416 PyObject_GenericSetAttr, /* tp_setattro */
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417 0, /* tp_as_buffer */
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418 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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419 Py_TPFLAGS_BASETYPE, /* tp_flags */
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420 module_doc, /* tp_doc */
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421 (traverseproc)module_traverse, /* tp_traverse */
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422 (inquiry)module_clear, /* tp_clear */
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423 0, /* tp_richcompare */
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424 0, /* tp_weaklistoffset */
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425 0, /* tp_iter */
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426 0, /* tp_iternext */
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427 0, /* tp_methods */
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428 module_members, /* tp_members */
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429 0, /* tp_getset */
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430 0, /* tp_base */
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431 0, /* tp_dict */
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432 0, /* tp_descr_get */
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433 0, /* tp_descr_set */
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434 offsetof(PyModuleObject, md_dict), /* tp_dictoffset */
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435 (initproc)module_init, /* tp_init */
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436 PyType_GenericAlloc, /* tp_alloc */
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437 PyType_GenericNew, /* tp_new */
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438 PyObject_GC_Del, /* tp_free */
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439 };