Mercurial > cpython-lru_cache-weakref

annotate Objects/moduleobject.c @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents b36cb4602e21
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 typedef struct {
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8 PyObject_HEAD
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9 PyObject *md_dict;
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10 } PyModuleObject;
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11
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12 static PyMemberDef module_members[] = {
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13 {"__dict__", T_OBJECT, offsetof(PyModuleObject, md_dict), READONLY},
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14 {0}
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15 };
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16
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17 PyObject *
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18 PyModule_New(const char *name)
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19 {
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20 PyModuleObject *m;
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21 PyObject *nameobj;
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22 m = PyObject_GC_New(PyModuleObject, &PyModule_Type);
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23 if (m == NULL)
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24 return NULL;
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25 nameobj = PyString_FromString(name);
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26 m->md_dict = PyDict_New();
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27 if (m->md_dict == NULL || nameobj == NULL)
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28 goto fail;
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29 if (PyDict_SetItemString(m->md_dict, "__name__", nameobj) != 0)
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30 goto fail;
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31 if (PyDict_SetItemString(m->md_dict, "__doc__", Py_None) != 0)
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32 goto fail;
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33 if (PyDict_SetItemString(m->md_dict, "__package__", Py_None) != 0)
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34 goto fail;
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35 Py_DECREF(nameobj);
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36 PyObject_GC_Track(m);
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37 return (PyObject *)m;
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38
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39 fail:
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40 Py_XDECREF(nameobj);
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41 Py_DECREF(m);
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42 return NULL;
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43 }
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44
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45 PyObject *
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46 PyModule_GetDict(PyObject *m)
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47 {
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48 PyObject *d;
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49 if (!PyModule_Check(m)) {
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50 PyErr_BadInternalCall();
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51 return NULL;
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52 }
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53 d = ((PyModuleObject *)m) -> md_dict;
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54 if (d == NULL)
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55 ((PyModuleObject *)m) -> md_dict = d = PyDict_New();
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56 return d;
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57 }
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58
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59 char *
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60 PyModule_GetName(PyObject *m)
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61 {
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62 PyObject *d;
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63 PyObject *nameobj;
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64 if (!PyModule_Check(m)) {
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65 PyErr_BadArgument();
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66 return NULL;
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67 }
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68 d = ((PyModuleObject *)m)->md_dict;
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69 if (d == NULL ||
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70 (nameobj = PyDict_GetItemString(d, "__name__")) == NULL ||
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71 !PyString_Check(nameobj))
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72 {
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73 PyErr_SetString(PyExc_SystemError, "nameless module");
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74 return NULL;
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75 }
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76 return PyString_AsString(nameobj);
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77 }
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78
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79 char *
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80 PyModule_GetFilename(PyObject *m)
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81 {
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82 PyObject *d;
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83 PyObject *fileobj;
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84 if (!PyModule_Check(m)) {
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85 PyErr_BadArgument();
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86 return NULL;
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87 }
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88 d = ((PyModuleObject *)m)->md_dict;
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89 if (d == NULL ||
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90 (fileobj = PyDict_GetItemString(d, "__file__")) == NULL ||
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91 !PyString_Check(fileobj))
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92 {
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93 PyErr_SetString(PyExc_SystemError, "module filename missing");
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94 return NULL;
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95 }
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96 return PyString_AsString(fileobj);
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97 }
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98
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99 void
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100 _PyModule_Clear(PyObject *m)
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101 {
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102 /* To make the execution order of destructors for global
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103 objects a bit more predictable, we first zap all objects
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104 whose name starts with a single underscore, before we clear
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105 the entire dictionary. We zap them by replacing them with
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106 None, rather than deleting them from the dictionary, to
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107 avoid rehashing the dictionary (to some extent). */
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108
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109 Py_ssize_t pos;
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110 PyObject *key, *value;
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111 PyObject *d;
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112
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113 d = ((PyModuleObject *)m)->md_dict;
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114 if (d == NULL)
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115 return;
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116
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117 /* First, clear only names starting with a single underscore */
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118 pos = 0;
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119 while (PyDict_Next(d, &pos, &key, &value)) {
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120 if (value != Py_None && PyString_Check(key)) {
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121 char *s = PyString_AsString(key);
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122 if (s[0] == '_' && s[1] != '_') {
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123 if (Py_VerboseFlag > 1)
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124 PySys_WriteStderr("# clear[1] %s\n", s);
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125 PyDict_SetItem(d, key, Py_None);
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126 }
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127 }
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128 }
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129
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130 /* Next, clear all names except for __builtins__ */
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131 pos = 0;
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132 while (PyDict_Next(d, &pos, &key, &value)) {
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133 if (value != Py_None && PyString_Check(key)) {
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134 char *s = PyString_AsString(key);
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135 if (s[0] != '_' || strcmp(s, "__builtins__") != 0) {
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136 if (Py_VerboseFlag > 1)
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137 PySys_WriteStderr("# clear[2] %s\n", s);
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138 PyDict_SetItem(d, key, Py_None);
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139 }
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140 }
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141 }
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142
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143 /* Note: we leave __builtins__ in place, so that destructors
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144 of non-global objects defined in this module can still use
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145 builtins, in particularly 'None'. */
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146
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147 }
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148
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149 /* Methods */
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150
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151 static int
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152 module_init(PyModuleObject *m, PyObject *args, PyObject *kwds)
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153 {
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154 static char *kwlist[] = {"name", "doc", NULL};
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155 PyObject *dict, *name = Py_None, *doc = Py_None;
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156 if (!PyArg_ParseTupleAndKeywords(args, kwds, "S|O:module.__init__",
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157 kwlist, &name, &doc))
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158 return -1;
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159 dict = m->md_dict;
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160 if (dict == NULL) {
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161 dict = PyDict_New();
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162 if (dict == NULL)
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163 return -1;
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164 m->md_dict = dict;
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165 }
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166 if (PyDict_SetItemString(dict, "__name__", name) < 0)
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167 return -1;
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168 if (PyDict_SetItemString(dict, "__doc__", doc) < 0)
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169 return -1;
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170 return 0;
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171 }
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172
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173 static void
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174 module_dealloc(PyModuleObject *m)
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175 {
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176 PyObject_GC_UnTrack(m);
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177 if (m->md_dict != NULL) {
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178 _PyModule_Clear((PyObject *)m);
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179 Py_DECREF(m->md_dict);
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180 }
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181 Py_TYPE(m)->tp_free((PyObject *)m);
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182 }
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183
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184 static PyObject *
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185 module_repr(PyModuleObject *m)
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186 {
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187 char *name;
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188 char *filename;
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189
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190 name = PyModule_GetName((PyObject *)m);
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191 if (name == NULL) {
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192 PyErr_Clear();
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193 name = "?";
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194 }
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195 filename = PyModule_GetFilename((PyObject *)m);
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196 if (filename == NULL) {
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197 PyErr_Clear();
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198 return PyString_FromFormat("<module '%s' (built-in)>", name);
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199 }
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200 return PyString_FromFormat("<module '%s' from '%s'>", name, filename);
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201 }
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202
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203 /* We only need a traverse function, no clear function: If the module
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204 is in a cycle, md_dict will be cleared as well, which will break
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205 the cycle. */
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206 static int
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207 module_traverse(PyModuleObject *m, visitproc visit, void *arg)
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208 {
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209 Py_VISIT(m->md_dict);
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210 return 0;
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211 }
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212
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213 PyDoc_STRVAR(module_doc,
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214 "module(name[, doc])\n\
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215 \n\
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216 Create a module object.\n\
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217 The name must be a string; the optional doc argument can have any type.");
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218
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219 PyTypeObject PyModule_Type = {
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220 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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221 "module", /* tp_name */
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222 sizeof(PyModuleObject), /* tp_size */
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223 0, /* tp_itemsize */
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224 (destructor)module_dealloc, /* tp_dealloc */
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225 0, /* tp_print */
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226 0, /* tp_getattr */
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227 0, /* tp_setattr */
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228 0, /* tp_compare */
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229 (reprfunc)module_repr, /* tp_repr */
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230 0, /* tp_as_number */
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231 0, /* tp_as_sequence */
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232 0, /* tp_as_mapping */
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233 0, /* tp_hash */
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234 0, /* tp_call */
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235 0, /* tp_str */
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236 PyObject_GenericGetAttr, /* tp_getattro */
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237 PyObject_GenericSetAttr, /* tp_setattro */
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238 0, /* tp_as_buffer */
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239 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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240 Py_TPFLAGS_BASETYPE, /* tp_flags */
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241 module_doc, /* tp_doc */
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242 (traverseproc)module_traverse, /* tp_traverse */
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243 0, /* tp_clear */
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244 0, /* tp_richcompare */
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245 0, /* tp_weaklistoffset */
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246 0, /* tp_iter */
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247 0, /* tp_iternext */
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248 0, /* tp_methods */
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249 module_members, /* tp_members */
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250 0, /* tp_getset */
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251 0, /* tp_base */
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252 0, /* tp_dict */
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253 0, /* tp_descr_get */
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254 0, /* tp_descr_set */
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255 offsetof(PyModuleObject, md_dict), /* tp_dictoffset */
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256 (initproc)module_init, /* tp_init */
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257 PyType_GenericAlloc, /* tp_alloc */
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258 PyType_GenericNew, /* tp_new */
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259 PyObject_GC_Del, /* tp_free */
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260 };