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annotate Objects/moduleobject.c @ 87488:124e51c19e4f

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Issue #19734: Also run pip version check in isolated mode
author Nick Coghlan <ncoghlan@gmail.com>
date Sun, 24 Nov 2013 16:49:20 +1000
parents 07229c6104b1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1
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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 PyObject *md_weaklist;
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15 PyObject *md_name; /* for logging purposes after md_dict is cleared */
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16 } PyModuleObject;
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17
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18 static PyMemberDef module_members[] = {
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19 {"__dict__", T_OBJECT, offsetof(PyModuleObject, md_dict), READONLY},
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20 {0}
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21 };
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22
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23 static PyTypeObject moduledef_type = {
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24 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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25 "moduledef", /* tp_name */
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26 sizeof(struct PyModuleDef), /* tp_size */
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27 0, /* tp_itemsize */
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28 };
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29
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30
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31 static int
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32 module_init_dict(PyModuleObject *mod, PyObject *md_dict,
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33 PyObject *name, PyObject *doc)
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34 {
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35 if (md_dict == NULL)
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36 return -1;
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37 if (doc == NULL)
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38 doc = Py_None;
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39
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40 if (PyDict_SetItemString(md_dict, "__name__", name) != 0)
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41 return -1;
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42 if (PyDict_SetItemString(md_dict, "__doc__", doc) != 0)
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43 return -1;
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44 if (PyDict_SetItemString(md_dict, "__package__", Py_None) != 0)
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45 return -1;
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46 if (PyDict_SetItemString(md_dict, "__loader__", Py_None) != 0)
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47 return -1;
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48 if (PyDict_SetItemString(md_dict, "__spec__", Py_None) != 0)
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49 return -1;
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50 if (PyUnicode_CheckExact(name)) {
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51 Py_INCREF(name);
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52 Py_XDECREF(mod->md_name);
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53 mod->md_name = name;
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54 }
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55
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56 return 0;
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57 }
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58
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59
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60 PyObject *
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61 PyModule_NewObject(PyObject *name)
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62 {
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63 PyModuleObject *m;
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64 m = PyObject_GC_New(PyModuleObject, &PyModule_Type);
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65 if (m == NULL)
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66 return NULL;
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67 m->md_def = NULL;
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68 m->md_state = NULL;
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69 m->md_weaklist = NULL;
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70 m->md_name = NULL;
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71 m->md_dict = PyDict_New();
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72 if (module_init_dict(m, m->md_dict, name, NULL) != 0)
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73 goto fail;
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74 PyObject_GC_Track(m);
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75 return (PyObject *)m;
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76
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77 fail:
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78 Py_DECREF(m);
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79 return NULL;
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80 }
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81
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82 PyObject *
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83 PyModule_New(const char *name)
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84 {
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85 PyObject *nameobj, *module;
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86 nameobj = PyUnicode_FromString(name);
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87 if (nameobj == NULL)
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88 return NULL;
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89 module = PyModule_NewObject(nameobj);
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90 Py_DECREF(nameobj);
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91 return module;
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92 }
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93
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94
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95 PyObject *
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96 PyModule_Create2(struct PyModuleDef* module, int module_api_version)
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97 {
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98 PyObject *d, *v, *n;
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99 PyMethodDef *ml;
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100 const char* name;
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101 PyModuleObject *m;
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102 PyInterpreterState *interp = PyThreadState_Get()->interp;
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103 if (interp->modules == NULL)
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104 Py_FatalError("Python import machinery not initialized");
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105 if (PyType_Ready(&moduledef_type) < 0)
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106 return NULL;
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107 if (module->m_base.m_index == 0) {
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108 max_module_number++;
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109 Py_REFCNT(module) = 1;
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110 Py_TYPE(module) = &moduledef_type;
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111 module->m_base.m_index = max_module_number;
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112 }
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113 name = module->m_name;
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114 if (module_api_version != PYTHON_API_VERSION && module_api_version != PYTHON_ABI_VERSION) {
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115 int err;
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116 err = PyErr_WarnFormat(PyExc_RuntimeWarning, 1,
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117 "Python C API version mismatch for module %.100s: "
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118 "This Python has API version %d, module %.100s has version %d.",
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119 name,
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120 PYTHON_API_VERSION, name, module_api_version);
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121 if (err)
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122 return NULL;
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123 }
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124 /* Make sure name is fully qualified.
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125
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126 This is a bit of a hack: when the shared library is loaded,
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127 the module name is "package.module", but the module calls
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128 PyModule_Create*() with just "module" for the name. The shared
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129 library loader squirrels away the true name of the module in
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130 _Py_PackageContext, and PyModule_Create*() will substitute this
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131 (if the name actually matches).
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132 */
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133 if (_Py_PackageContext != NULL) {
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134 char *p = strrchr(_Py_PackageContext, '.');
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135 if (p != NULL && strcmp(module->m_name, p+1) == 0) {
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136 name = _Py_PackageContext;
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137 _Py_PackageContext = NULL;
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138 }
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139 }
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140 if ((m = (PyModuleObject*)PyModule_New(name)) == NULL)
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141 return NULL;
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142
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143 if (module->m_size > 0) {
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144 m->md_state = PyMem_MALLOC(module->m_size);
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145 if (!m->md_state) {
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146 PyErr_NoMemory();
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147 Py_DECREF(m);
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148 return NULL;
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149 }
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150 memset(m->md_state, 0, module->m_size);
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151 }
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152
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153 d = PyModule_GetDict((PyObject*)m);
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154 if (module->m_methods != NULL) {
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155 n = PyUnicode_FromString(name);
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156 if (n == NULL) {
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157 Py_DECREF(m);
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158 return NULL;
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159 }
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160 for (ml = module->m_methods; ml->ml_name != NULL; ml++) {
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161 if ((ml->ml_flags & METH_CLASS) ||
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162 (ml->ml_flags & METH_STATIC)) {
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163 PyErr_SetString(PyExc_ValueError,
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164 "module functions cannot set"
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165 " METH_CLASS or METH_STATIC");
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166 Py_DECREF(n);
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167 Py_DECREF(m);
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168 return NULL;
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169 }
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170 v = PyCFunction_NewEx(ml, (PyObject*)m, n);
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171 if (v == NULL) {
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172 Py_DECREF(n);
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173 Py_DECREF(m);
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174 return NULL;
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175 }
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176 if (PyDict_SetItemString(d, ml->ml_name, v) != 0) {
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177 Py_DECREF(v);
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178 Py_DECREF(n);
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179 Py_DECREF(m);
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180 return NULL;
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181 }
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182 Py_DECREF(v);
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183 }
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184 Py_DECREF(n);
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185 }
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186 if (module->m_doc != NULL) {
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187 v = PyUnicode_FromString(module->m_doc);
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188 if (v == NULL || PyDict_SetItemString(d, "__doc__", v) != 0) {
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189 Py_XDECREF(v);
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190 Py_DECREF(m);
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191 return NULL;
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192 }
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193 Py_DECREF(v);
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194 }
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195 m->md_def = module;
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196 return (PyObject*)m;
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197 }
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198
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199
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200 PyObject *
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201 PyModule_GetDict(PyObject *m)
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202 {
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203 PyObject *d;
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204 if (!PyModule_Check(m)) {
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205 PyErr_BadInternalCall();
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206 return NULL;
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207 }
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208 d = ((PyModuleObject *)m) -> md_dict;
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209 if (d == NULL)
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210 ((PyModuleObject *)m) -> md_dict = d = PyDict_New();
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211 return d;
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212 }
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213
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214 PyObject*
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215 PyModule_GetNameObject(PyObject *m)
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216 {
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217 PyObject *d;
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218 PyObject *name;
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219 if (!PyModule_Check(m)) {
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220 PyErr_BadArgument();
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221 return NULL;
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222 }
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223 d = ((PyModuleObject *)m)->md_dict;
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224 if (d == NULL ||
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225 (name = PyDict_GetItemString(d, "__name__")) == NULL ||
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226 !PyUnicode_Check(name))
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227 {
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228 PyErr_SetString(PyExc_SystemError, "nameless module");
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229 return NULL;
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230 }
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231 Py_INCREF(name);
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232 return name;
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233 }
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234
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235 const char *
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236 PyModule_GetName(PyObject *m)
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237 {
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238 PyObject *name = PyModule_GetNameObject(m);
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239 if (name == NULL)
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240 return NULL;
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241 Py_DECREF(name); /* module dict has still a reference */
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242 return _PyUnicode_AsString(name);
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243 }
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244
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245 PyObject*
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246 PyModule_GetFilenameObject(PyObject *m)
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247 {
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248 PyObject *d;
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249 PyObject *fileobj;
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250 if (!PyModule_Check(m)) {
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251 PyErr_BadArgument();
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252 return NULL;
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253 }
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254 d = ((PyModuleObject *)m)->md_dict;
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255 if (d == NULL ||
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256 (fileobj = PyDict_GetItemString(d, "__file__")) == NULL ||
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257 !PyUnicode_Check(fileobj))
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258 {
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259 PyErr_SetString(PyExc_SystemError, "module filename missing");
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260 return NULL;
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261 }
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262 Py_INCREF(fileobj);
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263 return fileobj;
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264 }
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265
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266 const char *
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267 PyModule_GetFilename(PyObject *m)
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268 {
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269 PyObject *fileobj;
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270 char *utf8;
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271 fileobj = PyModule_GetFilenameObject(m);
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272 if (fileobj == NULL)
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273 return NULL;
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274 utf8 = _PyUnicode_AsString(fileobj);
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275 Py_DECREF(fileobj); /* module dict has still a reference */
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276 return utf8;
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277 }
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278
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279 PyModuleDef*
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280 PyModule_GetDef(PyObject* m)
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281 {
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282 if (!PyModule_Check(m)) {
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283 PyErr_BadArgument();
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284 return NULL;
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285 }
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286 return ((PyModuleObject *)m)->md_def;
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287 }
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288
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289 void*
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290 PyModule_GetState(PyObject* m)
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291 {
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292 if (!PyModule_Check(m)) {
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293 PyErr_BadArgument();
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294 return NULL;
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295 }
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296 return ((PyModuleObject *)m)->md_state;
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297 }
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298
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299 void
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300 _PyModule_Clear(PyObject *m)
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301 {
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302 /* To make the execution order of destructors for global
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303 objects a bit more predictable, we first zap all objects
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304 whose name starts with a single underscore, before we clear
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305 the entire dictionary. We zap them by replacing them with
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306 None, rather than deleting them from the dictionary, to
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307 avoid rehashing the dictionary (to some extent). */
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308
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309 Py_ssize_t pos;
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310 PyObject *key, *value;
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311 PyObject *d;
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312
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313 d = ((PyModuleObject *)m)->md_dict;
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314 if (d == NULL)
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315 return;
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316
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317 /* First, clear only names starting with a single underscore */
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318 pos = 0;
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319 while (PyDict_Next(d, &pos, &key, &value)) {
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320 if (value != Py_None && PyUnicode_Check(key)) {
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321 if (PyUnicode_READ_CHAR(key, 0) == '_' &&
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322 PyUnicode_READ_CHAR(key, 1) != '_') {
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323 if (Py_VerboseFlag > 1) {
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324 const char *s = _PyUnicode_AsString(key);
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325 if (s != NULL)
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326 PySys_WriteStderr("# clear[1] %s\n", s);
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327 else
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328 PyErr_Clear();
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329 }
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330 PyDict_SetItem(d, key, Py_None);
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331 }
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332 }
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333 }
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334
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335 /* Next, clear all names except for __builtins__ */
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336 pos = 0;
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337 while (PyDict_Next(d, &pos, &key, &value)) {
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338 if (value != Py_None && PyUnicode_Check(key)) {
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339 if (PyUnicode_READ_CHAR(key, 0) != '_' ||
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340 PyUnicode_CompareWithASCIIString(key, "__builtins__") != 0)
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341 {
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342 if (Py_VerboseFlag > 1) {
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343 const char *s = _PyUnicode_AsString(key);
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344 if (s != NULL)
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345 PySys_WriteStderr("# clear[2] %s\n", s);
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346 else
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347 PyErr_Clear();
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348 }
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349 PyDict_SetItem(d, key, Py_None);
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350 }
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351 }
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352 }
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353
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354 /* Note: we leave __builtins__ in place, so that destructors
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355 of non-global objects defined in this module can still use
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356 builtins, in particularly 'None'. */
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357
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358 }
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359
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360 /* Methods */
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361
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362 static int
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363 module_init(PyModuleObject *m, PyObject *args, PyObject *kwds)
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364 {
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365 static char *kwlist[] = {"name", "doc", NULL};
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366 PyObject *dict, *name = Py_None, *doc = Py_None;
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367 if (!PyArg_ParseTupleAndKeywords(args, kwds, "U|O:module.__init__",
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368 kwlist, &name, &doc))
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369 return -1;
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370 dict = m->md_dict;
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371 if (dict == NULL) {
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372 dict = PyDict_New();
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373 if (dict == NULL)
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374 return -1;
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375 m->md_dict = dict;
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376 }
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377 if (module_init_dict(m, dict, name, doc) < 0)
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378 return -1;
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379 return 0;
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380 }
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381
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382 static void
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383 module_dealloc(PyModuleObject *m)
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384 {
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385 PyObject_GC_UnTrack(m);
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386 if (Py_VerboseFlag && m->md_name) {
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387 PySys_FormatStderr("# destroy %S\n", m->md_name);
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388 }
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389 if (m->md_weaklist != NULL)
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390 PyObject_ClearWeakRefs((PyObject *) m);
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391 if (m->md_def && m->md_def->m_free)
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392 m->md_def->m_free(m);
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393 Py_XDECREF(m->md_dict);
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394 Py_XDECREF(m->md_name);
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395 if (m->md_state != NULL)
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396 PyMem_FREE(m->md_state);
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397 Py_TYPE(m)->tp_free((PyObject *)m);
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398 }
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399
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400 static PyObject *
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401 module_repr(PyModuleObject *m)
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402 {
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403 PyThreadState *tstate = PyThreadState_GET();
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404 PyInterpreterState *interp = tstate->interp;
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405
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406 return PyObject_CallMethod(interp->importlib, "_module_repr", "O", m);
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407 }
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408
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409 static int
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410 module_traverse(PyModuleObject *m, visitproc visit, void *arg)
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411 {
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412 if (m->md_def && m->md_def->m_traverse) {
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413 int res = m->md_def->m_traverse((PyObject*)m, visit, arg);
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414 if (res)
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415 return res;
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416 }
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417 Py_VISIT(m->md_dict);
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418 return 0;
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419 }
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420
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421 static int
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422 module_clear(PyModuleObject *m)
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423 {
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424 if (m->md_def && m->md_def->m_clear) {
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425 int res = m->md_def->m_clear((PyObject*)m);
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426 if (res)
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427 return res;
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428 }
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429 Py_CLEAR(m->md_dict);
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430 return 0;
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431 }
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432
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433 static PyObject *
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434 module_dir(PyObject *self, PyObject *args)
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435 {
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436 _Py_IDENTIFIER(__dict__);
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437 PyObject *result = NULL;
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438 PyObject *dict = _PyObject_GetAttrId(self, &PyId___dict__);
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439
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440 if (dict != NULL) {
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441 if (PyDict_Check(dict))
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442 result = PyDict_Keys(dict);
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443 else {
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444 const char *name = PyModule_GetName(self);
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445 if (name)
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446 PyErr_Format(PyExc_TypeError,
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447 "%.200s.__dict__ is not a dictionary",
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448 name);
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449 }
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450 }
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451
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452 Py_XDECREF(dict);
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453 return result;
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454 }
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455
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456 static PyMethodDef module_methods[] = {
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457 {"__dir__", module_dir, METH_NOARGS,
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458 PyDoc_STR("__dir__() -> list\nspecialized dir() implementation")},
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459 {0}
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460 };
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461
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462
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463 PyDoc_STRVAR(module_doc,
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464 "module(name[, doc])\n\
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465 \n\
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466 Create a module object.\n\
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467 The name must be a string; the optional doc argument can have any type.");
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468
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469 PyTypeObject PyModule_Type = {
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470 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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471 "module", /* tp_name */
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472 sizeof(PyModuleObject), /* tp_size */
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473 0, /* tp_itemsize */
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474 (destructor)module_dealloc, /* tp_dealloc */
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475 0, /* tp_print */
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476 0, /* tp_getattr */
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477 0, /* tp_setattr */
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478 0, /* tp_reserved */
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479 (reprfunc)module_repr, /* tp_repr */
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480 0, /* tp_as_number */
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481 0, /* tp_as_sequence */
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482 0, /* tp_as_mapping */
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483 0, /* tp_hash */
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484 0, /* tp_call */
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485 0, /* tp_str */
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486 PyObject_GenericGetAttr, /* tp_getattro */
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487 PyObject_GenericSetAttr, /* tp_setattro */
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488 0, /* tp_as_buffer */
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489 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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490 Py_TPFLAGS_BASETYPE, /* tp_flags */
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491 module_doc, /* tp_doc */
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492 (traverseproc)module_traverse, /* tp_traverse */
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493 (inquiry)module_clear, /* tp_clear */
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494 0, /* tp_richcompare */
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495 offsetof(PyModuleObject, md_weaklist), /* tp_weaklistoffset */
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496 0, /* tp_iter */
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497 0, /* tp_iternext */
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498 module_methods, /* tp_methods */
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499 module_members, /* tp_members */
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500 0, /* tp_getset */
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501 0, /* tp_base */
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502 0, /* tp_dict */
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503 0, /* tp_descr_get */
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504 0, /* tp_descr_set */
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505 offsetof(PyModuleObject, md_dict), /* tp_dictoffset */
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506 (initproc)module_init, /* tp_init */
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507 PyType_GenericAlloc, /* tp_alloc */
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508 PyType_GenericNew, /* tp_new */
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509 PyObject_GC_Del, /* tp_free */
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510 };