Mercurial > cpython-lru_cache-weakref

annotate Objects/moduleobject.c @ 84007:dbfbdf2b5c19 3.3

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Fix #17967: For ftp urls CWD to target instead of hopping to each directory towards target. This fixes a bug where target is accessible, but parent directories are restricted.
author Senthil Kumaran <senthil@uthcode.com>
date Sat, 01 Jun 2013 08:27:06 -0700
parents 571777bf5527
children e39a8f8ceb9f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
145
853b736a6a9e Added copyright notice.
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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 } 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_NewObject(PyObject *name)
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31 {
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32 PyModuleObject *m;
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33 m = PyObject_GC_New(PyModuleObject, &PyModule_Type);
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34 if (m == NULL)
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35 return NULL;
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36 m->md_def = NULL;
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37 m->md_state = NULL;
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38 m->md_dict = PyDict_New();
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39 if (m->md_dict == NULL)
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40 goto fail;
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41 if (PyDict_SetItemString(m->md_dict, "__name__", name) != 0)
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42 goto fail;
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43 if (PyDict_SetItemString(m->md_dict, "__doc__", Py_None) != 0)
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44 goto fail;
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45 if (PyDict_SetItemString(m->md_dict, "__package__", Py_None) != 0)
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46 goto fail;
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47 PyObject_GC_Track(m);
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48 return (PyObject *)m;
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49
315272ec4d5b * import.c (get_module): total rewrite, to ensure proper search order: for
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50 fail:
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51 Py_DECREF(m);
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52 return NULL;
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53 }
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54
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55 PyObject *
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56 PyModule_New(const char *name)
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57 {
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58 PyObject *nameobj, *module;
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59 nameobj = PyUnicode_FromString(name);
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60 if (nameobj == NULL)
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61 return NULL;
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62 module = PyModule_NewObject(nameobj);
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63 Py_DECREF(nameobj);
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64 return module;
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65 }
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66
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67
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68 PyObject *
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69 PyModule_Create2(struct PyModuleDef* module, int module_api_version)
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70 {
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71 PyObject *d, *v, *n;
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72 PyMethodDef *ml;
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73 const char* name;
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74 PyModuleObject *m;
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75 PyInterpreterState *interp = PyThreadState_Get()->interp;
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76 if (interp->modules == NULL)
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77 Py_FatalError("Python import machinery not initialized");
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78 if (PyType_Ready(&moduledef_type) < 0)
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79 return NULL;
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80 if (module->m_base.m_index == 0) {
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81 max_module_number++;
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82 Py_REFCNT(module) = 1;
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83 Py_TYPE(module) = &moduledef_type;
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84 module->m_base.m_index = max_module_number;
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85 }
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86 name = module->m_name;
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87 if (module_api_version != PYTHON_API_VERSION && module_api_version != PYTHON_ABI_VERSION) {
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88 int err;
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89 err = PyErr_WarnFormat(PyExc_RuntimeWarning, 1,
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90 "Python C API version mismatch for module %.100s: "
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91 "This Python has API version %d, module %.100s has version %d.",
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92 name,
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93 PYTHON_API_VERSION, name, module_api_version);
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94 if (err)
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95 return NULL;
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96 }
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97 /* Make sure name is fully qualified.
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98
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99 This is a bit of a hack: when the shared library is loaded,
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100 the module name is "package.module", but the module calls
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101 PyModule_Create*() with just "module" for the name. The shared
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102 library loader squirrels away the true name of the module in
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103 _Py_PackageContext, and PyModule_Create*() will substitute this
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104 (if the name actually matches).
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105 */
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106 if (_Py_PackageContext != NULL) {
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107 char *p = strrchr(_Py_PackageContext, '.');
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108 if (p != NULL && strcmp(module->m_name, p+1) == 0) {
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109 name = _Py_PackageContext;
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110 _Py_PackageContext = NULL;
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111 }
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112 }
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113 if ((m = (PyModuleObject*)PyModule_New(name)) == NULL)
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114 return NULL;
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115
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116 if (module->m_size > 0) {
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117 m->md_state = PyMem_MALLOC(module->m_size);
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118 if (!m->md_state) {
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119 PyErr_NoMemory();
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120 Py_DECREF(m);
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121 return NULL;
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122 }
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123 memset(m->md_state, 0, module->m_size);
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124 }
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125
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126 d = PyModule_GetDict((PyObject*)m);
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127 if (module->m_methods != NULL) {
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128 n = PyUnicode_FromString(name);
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129 if (n == NULL) {
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130 Py_DECREF(m);
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131 return NULL;
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132 }
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133 for (ml = module->m_methods; ml->ml_name != NULL; ml++) {
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134 if ((ml->ml_flags & METH_CLASS) ||
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135 (ml->ml_flags & METH_STATIC)) {
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136 PyErr_SetString(PyExc_ValueError,
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137 "module functions cannot set"
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138 " METH_CLASS or METH_STATIC");
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139 Py_DECREF(n);
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140 Py_DECREF(m);
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141 return NULL;
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142 }
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143 v = PyCFunction_NewEx(ml, (PyObject*)m, n);
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144 if (v == NULL) {
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145 Py_DECREF(n);
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146 Py_DECREF(m);
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147 return NULL;
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148 }
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149 if (PyDict_SetItemString(d, ml->ml_name, v) != 0) {
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150 Py_DECREF(v);
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151 Py_DECREF(n);
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152 Py_DECREF(m);
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153 return NULL;
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154 }
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155 Py_DECREF(v);
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156 }
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157 Py_DECREF(n);
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158 }
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159 if (module->m_doc != NULL) {
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160 v = PyUnicode_FromString(module->m_doc);
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161 if (v == NULL || PyDict_SetItemString(d, "__doc__", v) != 0) {
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162 Py_XDECREF(v);
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163 Py_DECREF(m);
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164 return NULL;
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165 }
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166 Py_DECREF(v);
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167 }
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168 m->md_def = module;
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169 return (PyObject*)m;
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170 }
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171
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172
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173 PyObject *
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174 PyModule_GetDict(PyObject *m)
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175 {
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176 PyObject *d;
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177 if (!PyModule_Check(m)) {
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178 PyErr_BadInternalCall();
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179 return NULL;
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180 }
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181 d = ((PyModuleObject *)m) -> md_dict;
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182 if (d == NULL)
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183 ((PyModuleObject *)m) -> md_dict = d = PyDict_New();
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184 return d;
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185 }
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186
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187 PyObject*
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188 PyModule_GetNameObject(PyObject *m)
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189 {
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190 PyObject *d;
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191 PyObject *name;
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192 if (!PyModule_Check(m)) {
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193 PyErr_BadArgument();
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194 return NULL;
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195 }
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196 d = ((PyModuleObject *)m)->md_dict;
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197 if (d == NULL ||
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198 (name = PyDict_GetItemString(d, "__name__")) == NULL ||
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199 !PyUnicode_Check(name))
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200 {
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201 PyErr_SetString(PyExc_SystemError, "nameless module");
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202 return NULL;
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203 }
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204 Py_INCREF(name);
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205 return name;
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206 }
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207
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208 const char *
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209 PyModule_GetName(PyObject *m)
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210 {
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211 PyObject *name = PyModule_GetNameObject(m);
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212 if (name == NULL)
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213 return NULL;
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214 Py_DECREF(name); /* module dict has still a reference */
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215 return _PyUnicode_AsString(name);
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216 }
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217
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218 PyObject*
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219 PyModule_GetFilenameObject(PyObject *m)
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220 {
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221 PyObject *d;
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222 PyObject *fileobj;
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223 if (!PyModule_Check(m)) {
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224 PyErr_BadArgument();
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225 return NULL;
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226 }
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227 d = ((PyModuleObject *)m)->md_dict;
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228 if (d == NULL ||
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229 (fileobj = PyDict_GetItemString(d, "__file__")) == NULL ||
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230 !PyUnicode_Check(fileobj))
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231 {
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232 PyErr_SetString(PyExc_SystemError, "module filename missing");
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233 return NULL;
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234 }
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235 Py_INCREF(fileobj);
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236 return fileobj;
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237 }
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238
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239 const char *
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240 PyModule_GetFilename(PyObject *m)
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241 {
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242 PyObject *fileobj;
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243 char *utf8;
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244 fileobj = PyModule_GetFilenameObject(m);
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245 if (fileobj == NULL)
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246 return NULL;
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247 utf8 = _PyUnicode_AsString(fileobj);
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248 Py_DECREF(fileobj); /* module dict has still a reference */
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249 return utf8;
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250 }
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251
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252 PyModuleDef*
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253 PyModule_GetDef(PyObject* m)
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254 {
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255 if (!PyModule_Check(m)) {
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256 PyErr_BadArgument();
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257 return NULL;
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258 }
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259 return ((PyModuleObject *)m)->md_def;
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260 }
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261
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262 void*
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263 PyModule_GetState(PyObject* m)
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264 {
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265 if (!PyModule_Check(m)) {
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266 PyErr_BadArgument();
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267 return NULL;
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268 }
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269 return ((PyModuleObject *)m)->md_state;
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270 }
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271
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272 void
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273 _PyModule_Clear(PyObject *m)
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274 {
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275 /* To make the execution order of destructors for global
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276 objects a bit more predictable, we first zap all objects
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277 whose name starts with a single underscore, before we clear
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278 the entire dictionary. We zap them by replacing them with
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279 None, rather than deleting them from the dictionary, to
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280 avoid rehashing the dictionary (to some extent). */
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281
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282 Py_ssize_t pos;
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283 PyObject *key, *value;
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284 PyObject *d;
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285
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286 d = ((PyModuleObject *)m)->md_dict;
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287 if (d == NULL)
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288 return;
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289
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290 /* First, clear only names starting with a single underscore */
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291 pos = 0;
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292 while (PyDict_Next(d, &pos, &key, &value)) {
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293 if (value != Py_None && PyUnicode_Check(key)) {
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294 if (PyUnicode_READ_CHAR(key, 0) == '_' &&
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295 PyUnicode_READ_CHAR(key, 1) != '_') {
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296 if (Py_VerboseFlag > 1) {
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297 const char *s = _PyUnicode_AsString(key);
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298 if (s != NULL)
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299 PySys_WriteStderr("# clear[1] %s\n", s);
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300 else
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301 PyErr_Clear();
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302 }
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303 PyDict_SetItem(d, key, Py_None);
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304 }
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305 }
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306 }
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307
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308 /* Next, clear all names except for __builtins__ */
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309 pos = 0;
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310 while (PyDict_Next(d, &pos, &key, &value)) {
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311 if (value != Py_None && PyUnicode_Check(key)) {
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312 if (PyUnicode_READ_CHAR(key, 0) != '_' ||
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313 PyUnicode_CompareWithASCIIString(key, "__builtins__") != 0)
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314 {
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315 if (Py_VerboseFlag > 1) {
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316 const char *s = _PyUnicode_AsString(key);
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317 if (s != NULL)
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318 PySys_WriteStderr("# clear[2] %s\n", s);
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319 else
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320 PyErr_Clear();
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321 }
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322 PyDict_SetItem(d, key, Py_None);
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323 }
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324 }
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325 }
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326
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327 /* Note: we leave __builtins__ in place, so that destructors
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328 of non-global objects defined in this module can still use
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329 builtins, in particularly 'None'. */
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330
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331 }
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332
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333 /* Methods */
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334
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335 static int
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336 module_init(PyModuleObject *m, PyObject *args, PyObject *kwds)
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337 {
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338 static char *kwlist[] = {"name", "doc", NULL};
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339 PyObject *dict, *name = Py_None, *doc = Py_None;
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340 if (!PyArg_ParseTupleAndKeywords(args, kwds, "U|O:module.__init__",
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341 kwlist, &name, &doc))
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342 return -1;
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343 dict = m->md_dict;
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344 if (dict == NULL) {
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345 dict = PyDict_New();
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346 if (dict == NULL)
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347 return -1;
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348 m->md_dict = dict;
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349 }
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350 if (PyDict_SetItemString(dict, "__name__", name) < 0)
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351 return -1;
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352 if (PyDict_SetItemString(dict, "__doc__", doc) < 0)
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353 return -1;
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354 return 0;
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355 }
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356
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357 static void
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358 module_dealloc(PyModuleObject *m)
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359 {
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360 PyObject_GC_UnTrack(m);
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361 if (m->md_def && m->md_def->m_free)
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362 m->md_def->m_free(m);
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363 if (m->md_dict != NULL) {
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364 _PyModule_Clear((PyObject *)m);
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365 Py_DECREF(m->md_dict);
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366 }
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367 if (m->md_state != NULL)
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368 PyMem_FREE(m->md_state);
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369 Py_TYPE(m)->tp_free((PyObject *)m);
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370 }
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371
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372 static PyObject *
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373 module_repr(PyModuleObject *m)
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374 {
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375 PyObject *name, *filename, *repr, *loader = NULL;
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376
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377 /* See if the module has an __loader__. If it does, give the loader the
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378 * first shot at producing a repr for the module.
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379 */
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380 if (m->md_dict != NULL) {
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381 loader = PyDict_GetItemString(m->md_dict, "__loader__");
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382 }
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383 if (loader != NULL) {
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384 repr = PyObject_CallMethod(loader, "module_repr", "(O)",
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385 (PyObject *)m, NULL);
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386 if (repr == NULL) {
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387 PyErr_Clear();
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388 }
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389 else {
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390 return repr;
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391 }
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392 }
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393 /* __loader__.module_repr(m) did not provide us with a repr. Next, see if
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394 * the module has an __file__. If it doesn't then use repr(__loader__) if
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395 * it exists, otherwise, just use module.__name__.
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396 */
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397 name = PyModule_GetNameObject((PyObject *)m);
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398 if (name == NULL) {
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399 PyErr_Clear();
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400 name = PyUnicode_FromStringAndSize("?", 1);
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401 if (name == NULL)
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402 return NULL;
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403 }
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404 filename = PyModule_GetFilenameObject((PyObject *)m);
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405 if (filename == NULL) {
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406 PyErr_Clear();
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407 /* There's no m.__file__, so if there was an __loader__, use that in
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408 * the repr, otherwise, the only thing you can use is m.__name__
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409 */
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410 if (loader == NULL) {
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411 repr = PyUnicode_FromFormat("<module %R>", name);
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412 }
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413 else {
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414 repr = PyUnicode_FromFormat("<module %R (%R)>", name, loader);
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415 }
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416 }
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417 /* Finally, use m.__file__ */
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418 else {
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419 repr = PyUnicode_FromFormat("<module %R from %R>", name, filename);
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420 Py_DECREF(filename);
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421 }
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422 Py_DECREF(name);
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423 return repr;
6
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424 }
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425
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426 static int
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427 module_traverse(PyModuleObject *m, visitproc visit, void *arg)
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428 {
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429 if (m->md_def && m->md_def->m_traverse) {
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430 int res = m->md_def->m_traverse((PyObject*)m, visit, arg);
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431 if (res)
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432 return res;
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433 }
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434 Py_VISIT(m->md_dict);
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435 return 0;
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436 }
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437
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438 static int
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439 module_clear(PyModuleObject *m)
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440 {
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441 if (m->md_def && m->md_def->m_clear) {
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442 int res = m->md_def->m_clear((PyObject*)m);
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443 if (res)
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444 return res;
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445 }
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446 Py_CLEAR(m->md_dict);
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447 return 0;
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448 }
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449
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450 static PyObject *
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451 module_dir(PyObject *self, PyObject *args)
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452 {
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453 _Py_IDENTIFIER(__dict__);
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454 PyObject *result = NULL;
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455 PyObject *dict = _PyObject_GetAttrId(self, &PyId___dict__);
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456
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457 if (dict != NULL) {
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458 if (PyDict_Check(dict))
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459 result = PyDict_Keys(dict);
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460 else {
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461 const char *name = PyModule_GetName(self);
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462 if (name)
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463 PyErr_Format(PyExc_TypeError,
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464 "%.200s.__dict__ is not a dictionary",
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465 name);
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466 }
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467 }
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468
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469 Py_XDECREF(dict);
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470 return result;
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471 }
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472
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473 static PyMethodDef module_methods[] = {
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474 {"__dir__", module_dir, METH_NOARGS,
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475 PyDoc_STR("__dir__() -> list\nspecialized dir() implementation")},
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476 {0}
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477 };
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478
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479
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480 PyDoc_STRVAR(module_doc,
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481 "module(name[, doc])\n\
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482 \n\
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483 Create a module object.\n\
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484 The name must be a string; the optional doc argument can have any type.");
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485
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486 PyTypeObject PyModule_Type = {
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487 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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488 "module", /* tp_name */
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489 sizeof(PyModuleObject), /* tp_size */
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490 0, /* tp_itemsize */
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491 (destructor)module_dealloc, /* tp_dealloc */
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492 0, /* tp_print */
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493 0, /* tp_getattr */
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494 0, /* tp_setattr */
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495 0, /* tp_reserved */
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496 (reprfunc)module_repr, /* tp_repr */
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497 0, /* tp_as_number */
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498 0, /* tp_as_sequence */
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499 0, /* tp_as_mapping */
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500 0, /* tp_hash */
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501 0, /* tp_call */
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502 0, /* tp_str */
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503 PyObject_GenericGetAttr, /* tp_getattro */
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504 PyObject_GenericSetAttr, /* tp_setattro */
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505 0, /* tp_as_buffer */
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506 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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507 Py_TPFLAGS_BASETYPE, /* tp_flags */
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508 module_doc, /* tp_doc */
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509 (traverseproc)module_traverse, /* tp_traverse */
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510 (inquiry)module_clear, /* tp_clear */
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511 0, /* tp_richcompare */
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512 0, /* tp_weaklistoffset */
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513 0, /* tp_iter */
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514 0, /* tp_iternext */
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515 module_methods, /* tp_methods */
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516 module_members, /* tp_members */
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517 0, /* tp_getset */
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518 0, /* tp_base */
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519 0, /* tp_dict */
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520 0, /* tp_descr_get */
f197407bdba2 Recorded merge of revisions 81032 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 57210
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521 0, /* tp_descr_set */
f197407bdba2 Recorded merge of revisions 81032 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 57210
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522 offsetof(PyModuleObject, md_dict), /* tp_dictoffset */
f197407bdba2 Recorded merge of revisions 81032 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 57210
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523 (initproc)module_init, /* tp_init */
f197407bdba2 Recorded merge of revisions 81032 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 57210
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524 PyType_GenericAlloc, /* tp_alloc */
f197407bdba2 Recorded merge of revisions 81032 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 57210
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525 PyType_GenericNew, /* tp_new */
f197407bdba2 Recorded merge of revisions 81032 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 57210
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526 PyObject_GC_Del, /* tp_free */
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fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
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527 };