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annotate Objects/moduleobject.c @ 58689:514b56efd89a 3.1

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Merged revisions 77962 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ................ r77962 | r.david.murray | 2010-02-04 11:41:57 -0500 (Thu, 04 Feb 2010) | 17 lines Merged revisions 77943,77959-77960 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77943 | r.david.murray | 2010-02-03 08:36:23 -0500 (Wed, 03 Feb 2010) | 2 lines Explicitly mention the default value for formatdate's usegmt parameter. ........ r77959 | nick.coghlan | 2010-02-04 07:43:58 -0500 (Thu, 04 Feb 2010) | 1 line Issue 6760: Clarify args handling for subprocess.Popen. Patch by Chris Rebert ........ r77960 | r.david.murray | 2010-02-04 11:33:31 -0500 (Thu, 04 Feb 2010) | 2 lines Add Chris Rebert to ACKS for issue 6760 Popen doc improvements. ........ ................
author R. David Murray <rdmurray@bitdance.com>
date Thu, 04 Feb 2010 16:44:31 +0000
parents a0951f11be3d
children f197407bdba2 5260104db99d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
145
853b736a6a9e Added copyright notice.
Guido van Rossum <guido@python.org>
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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"
6
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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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Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 20277
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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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Jeremy Hylton <jeremy@alum.mit.edu>
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30 PyModule_New(const char *name)
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31 {
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32 PyModuleObject *m;
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33 PyObject *nameobj;
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34 m = PyObject_GC_New(PyModuleObject, &PyModule_Type);
6
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35 if (m == NULL)
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36 return NULL;
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37 m->md_def = NULL;
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38 m->md_state = NULL;
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39 nameobj = PyUnicode_FromString(name);
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40 m->md_dict = PyDict_New();
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41 if (m->md_dict == NULL || nameobj == NULL)
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42 goto fail;
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43 if (PyDict_SetItemString(m->md_dict, "__name__", nameobj) != 0)
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44 goto fail;
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45 if (PyDict_SetItemString(m->md_dict, "__doc__", Py_None) != 0)
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46 goto fail;
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47 if (PyDict_SetItemString(m->md_dict, "__package__", Py_None) != 0)
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48 goto fail;
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49 Py_DECREF(nameobj);
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50 PyObject_GC_Track(m);
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51 return (PyObject *)m;
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52
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53 fail:
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54 Py_XDECREF(nameobj);
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55 Py_DECREF(m);
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56 return NULL;
6
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57 }
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58
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59 static char api_version_warning[] =
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60 "Python C API version mismatch for module %.100s:\
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61 This Python has API version %d, module %.100s has version %d.";
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62
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63 PyObject *
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64 PyModule_Create2(struct PyModuleDef* module, int module_api_version)
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65 {
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66 PyObject *d, *v, *n;
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67 PyMethodDef *ml;
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68 const char* name;
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69 PyModuleObject *m;
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70 if (!Py_IsInitialized())
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71 Py_FatalError("Interpreter not initialized (version mismatch?)");
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72 if (PyType_Ready(&moduledef_type) < 0)
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73 return NULL;
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74 if (module->m_base.m_index == 0) {
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Martin v. Löwis <martin@v.loewis.de>
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75 max_module_number++;
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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76 Py_REFCNT(module) = 1;
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77 Py_TYPE(module) = &moduledef_type;
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78 module->m_base.m_index = max_module_number;
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79 }
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80 name = module->m_name;
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81 if (module_api_version != PYTHON_API_VERSION) {
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82 char message[512];
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83 PyOS_snprintf(message, sizeof(message),
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84 api_version_warning, name,
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85 PYTHON_API_VERSION, name,
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86 module_api_version);
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87 if (PyErr_WarnEx(PyExc_RuntimeWarning, message, 1))
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Martin v. Löwis <martin@v.loewis.de>
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88 return NULL;
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Martin v. Löwis <martin@v.loewis.de>
parents: 44351
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89 }
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parents: 44351
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90 /* Make sure name is fully qualified.
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parents: 44351
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91
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92 This is a bit of a hack: when the shared library is loaded,
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
93 the module name is "package.module", but the module calls
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Georg Brandl <georg@python.org>
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94 PyModule_Create*() with just "module" for the name. The shared
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94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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95 library loader squirrels away the true name of the module in
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96 _Py_PackageContext, and PyModule_Create*() will substitute this
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97 (if the name actually matches).
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98 */
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99 if (_Py_PackageContext != NULL) {
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100 char *p = strrchr(_Py_PackageContext, '.');
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101 if (p != NULL && strcmp(module->m_name, p+1) == 0) {
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102 name = _Py_PackageContext;
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103 _Py_PackageContext = NULL;
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104 }
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105 }
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106 if ((m = (PyModuleObject*)PyModule_New(name)) == NULL)
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107 return NULL;
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108
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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109 if (module->m_size > 0) {
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diff changeset
110 m->md_state = PyMem_MALLOC(module->m_size);
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diff changeset
111 if (!m->md_state) {
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112 PyErr_NoMemory();
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diff changeset
113 Py_DECREF(m);
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114 return NULL;
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parents: 44351
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115 }
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82091df651be Issue #3740: Null-initialize module state.
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parents: 48660
diff changeset
116 memset(m->md_state, 0, module->m_size);
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117 }
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118
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119 d = PyModule_GetDict((PyObject*)m);
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120 if (module->m_methods != NULL) {
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121 n = PyUnicode_FromString(name);
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122 if (n == NULL)
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123 return NULL;
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124 for (ml = module->m_methods; ml->ml_name != NULL; ml++) {
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125 if ((ml->ml_flags & METH_CLASS) ||
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126 (ml->ml_flags & METH_STATIC)) {
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127 PyErr_SetString(PyExc_ValueError,
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128 "module functions cannot set"
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129 " METH_CLASS or METH_STATIC");
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130 Py_DECREF(n);
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131 return NULL;
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132 }
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133 v = PyCFunction_NewEx(ml, (PyObject*)m, n);
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134 if (v == NULL) {
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135 Py_DECREF(n);
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136 return NULL;
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137 }
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138 if (PyDict_SetItemString(d, ml->ml_name, v) != 0) {
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139 Py_DECREF(v);
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140 Py_DECREF(n);
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141 return NULL;
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142 }
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143 Py_DECREF(v);
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144 }
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145 Py_DECREF(n);
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146 }
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147 if (module->m_doc != NULL) {
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148 v = PyUnicode_FromString(module->m_doc);
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149 if (v == NULL || PyDict_SetItemString(d, "__doc__", v) != 0) {
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150 Py_XDECREF(v);
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151 return NULL;
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152 }
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153 Py_DECREF(v);
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154 }
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155 m->md_def = module;
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156 return (PyObject*)m;
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157 }
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158
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159
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160 PyObject *
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161 PyModule_GetDict(PyObject *m)
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162 {
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163 PyObject *d;
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164 if (!PyModule_Check(m)) {
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165 PyErr_BadInternalCall();
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166 return NULL;
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167 }
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168 d = ((PyModuleObject *)m) -> md_dict;
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169 if (d == NULL)
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170 ((PyModuleObject *)m) -> md_dict = d = PyDict_New();
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171 return d;
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172 }
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173
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174 const char *
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175 PyModule_GetName(PyObject *m)
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176 {
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177 PyObject *d;
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178 PyObject *nameobj;
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179 if (!PyModule_Check(m)) {
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180 PyErr_BadArgument();
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181 return NULL;
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182 }
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183 d = ((PyModuleObject *)m)->md_dict;
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184 if (d == NULL ||
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185 (nameobj = PyDict_GetItemString(d, "__name__")) == NULL ||
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186 !PyUnicode_Check(nameobj))
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187 {
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188 PyErr_SetString(PyExc_SystemError, "nameless module");
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189 return NULL;
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190 }
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191 return _PyUnicode_AsString(nameobj);
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192 }
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193
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194 const char *
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195 PyModule_GetFilename(PyObject *m)
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196 {
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197 PyObject *d;
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198 PyObject *fileobj;
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199 if (!PyModule_Check(m)) {
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200 PyErr_BadArgument();
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201 return NULL;
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202 }
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203 d = ((PyModuleObject *)m)->md_dict;
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204 if (d == NULL ||
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205 (fileobj = PyDict_GetItemString(d, "__file__")) == NULL ||
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19319e70fc3e Patch #1272, by Christian Heimes and Alexandre Vassalotti.
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206 !PyUnicode_Check(fileobj))
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207 {
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208 PyErr_SetString(PyExc_SystemError, "module filename missing");
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209 return NULL;
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210 }
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211 return _PyUnicode_AsString(fileobj);
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212 }
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213
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diff changeset
214 PyModuleDef*
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diff changeset
215 PyModule_GetDef(PyObject* m)
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216 {
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diff changeset
217 if (!PyModule_Check(m)) {
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218 PyErr_BadArgument();
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219 return NULL;
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220 }
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221 return ((PyModuleObject *)m)->md_def;
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222 }
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223
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diff changeset
224 void*
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225 PyModule_GetState(PyObject* m)
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226 {
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diff changeset
227 if (!PyModule_Check(m)) {
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228 PyErr_BadArgument();
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229 return NULL;
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230 }
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231 return ((PyModuleObject *)m)->md_state;
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232 }
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233
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234 void
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235 _PyModule_Clear(PyObject *m)
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236 {
8c01cfee14ba Add internal routine _PyModule_Clear(), which does approximately what
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diff changeset
237 /* To make the execution order of destructors for global
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diff changeset
238 objects a bit more predictable, we first zap all objects
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diff changeset
239 whose name starts with a single underscore, before we clear
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diff changeset
240 the entire dictionary. We zap them by replacing them with
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diff changeset
241 None, rather than deleting them from the dictionary, to
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diff changeset
242 avoid rehashing the dictionary (to some extent). */
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diff changeset
243
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7fdc639bc5b4 Merge ssize_t branch.
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diff changeset
244 Py_ssize_t pos;
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245 PyObject *key, *value;
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246 PyObject *d;
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247
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248 d = ((PyModuleObject *)m)->md_dict;
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249 if (d == NULL)
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250 return;
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251
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252 /* First, clear only names starting with a single underscore */
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253 pos = 0;
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254 while (PyDict_Next(d, &pos, &key, &value)) {
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255 if (value != Py_None && PyUnicode_Check(key)) {
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256 const char *s = _PyUnicode_AsString(key);
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257 if (s[0] == '_' && s[1] != '_') {
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258 if (Py_VerboseFlag > 1)
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259 PySys_WriteStderr("# clear[1] %s\n", s);
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260 PyDict_SetItem(d, key, Py_None);
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261 }
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262 }
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263 }
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264
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265 /* Next, clear all names except for __builtins__ */
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266 pos = 0;
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267 while (PyDict_Next(d, &pos, &key, &value)) {
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268 if (value != Py_None && PyUnicode_Check(key)) {
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269 const char *s = _PyUnicode_AsString(key);
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270 if (s[0] != '_' || strcmp(s, "__builtins__") != 0) {
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271 if (Py_VerboseFlag > 1)
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272 PySys_WriteStderr("# clear[2] %s\n", s);
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273 PyDict_SetItem(d, key, Py_None);
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274 }
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275 }
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276 }
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277
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278 /* Note: we leave __builtins__ in place, so that destructors
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279 of non-global objects defined in this module can still use
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280 builtins, in particularly 'None'. */
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281
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282 }
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283
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284 /* Methods */
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285
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286 static int
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287 module_init(PyModuleObject *m, PyObject *args, PyObject *kwds)
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288 {
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289 static char *kwlist[] = {"name", "doc", NULL};
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290 PyObject *dict, *name = Py_None, *doc = Py_None;
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291 if (!PyArg_ParseTupleAndKeywords(args, kwds, "U|O:module.__init__",
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292 kwlist, &name, &doc))
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293 return -1;
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294 dict = m->md_dict;
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295 if (dict == NULL) {
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296 dict = PyDict_New();
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297 if (dict == NULL)
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298 return -1;
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299 m->md_dict = dict;
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300 }
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301 if (PyDict_SetItemString(dict, "__name__", name) < 0)
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302 return -1;
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303 if (PyDict_SetItemString(dict, "__doc__", doc) < 0)
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304 return -1;
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305 return 0;
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306 }
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307
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308 static void
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309 module_dealloc(PyModuleObject *m)
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310 {
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311 PyObject_GC_UnTrack(m);
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312 if (m->md_def && m->md_def->m_free)
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313 m->md_def->m_free(m);
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314 if (m->md_dict != NULL) {
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315 /* If we are the only ones holding a reference, we can clear
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316 the dictionary. */
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317 if (Py_REFCNT(m->md_dict) == 1)
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318 _PyModule_Clear((PyObject *)m);
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319 Py_DECREF(m->md_dict);
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320 }
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321 if (m->md_state != NULL)
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322 PyMem_FREE(m->md_state);
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323 Py_TYPE(m)->tp_free((PyObject *)m);
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324 }
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325
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326 static PyObject *
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327 module_repr(PyModuleObject *m)
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328 {
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329 const char *name;
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330 const char *filename;
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331
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332 name = PyModule_GetName((PyObject *)m);
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333 if (name == NULL) {
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334 PyErr_Clear();
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335 name = "?";
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336 }
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337 filename = PyModule_GetFilename((PyObject *)m);
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338 if (filename == NULL) {
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339 PyErr_Clear();
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340 return PyUnicode_FromFormat("<module '%s' (built-in)>", name);
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341 }
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342 return PyUnicode_FromFormat("<module '%s' from '%s'>", name, filename);
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343 }
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344
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345 static int
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346 module_traverse(PyModuleObject *m, visitproc visit, void *arg)
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347 {
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348 if (m->md_def && m->md_def->m_traverse) {
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349 int res = m->md_def->m_traverse((PyObject*)m, visit, arg);
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350 if (res)
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351 return res;
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352 }
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353 Py_VISIT(m->md_dict);
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354 return 0;
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355 }
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356
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357 static int
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358 module_clear(PyModuleObject *m)
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359 {
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360 if (m->md_def && m->md_def->m_clear) {
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361 int res = m->md_def->m_clear((PyObject*)m);
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diff changeset
362 if (res)
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diff changeset
363 return res;
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364 }
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365 Py_CLEAR(m->md_dict);
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366 return 0;
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367 }
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368
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diff changeset
369
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370 PyDoc_STRVAR(module_doc,
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diff changeset
371 "module(name[, doc])\n\
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diff changeset
372 \n\
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373 Create a module object.\n\
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374 The name must be a string; the optional doc argument can have any type.");
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375
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376 PyTypeObject PyModule_Type = {
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377 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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378 "module", /* tp_name */
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379 sizeof(PyModuleObject), /* tp_size */
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380 0, /* tp_itemsize */
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381 (destructor)module_dealloc, /* tp_dealloc */
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382 0, /* tp_print */
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383 0, /* tp_getattr */
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384 0, /* tp_setattr */
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385 0, /* tp_reserved */
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386 (reprfunc)module_repr, /* tp_repr */
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387 0, /* tp_as_number */
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388 0, /* tp_as_sequence */
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389 0, /* tp_as_mapping */
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390 0, /* tp_hash */
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391 0, /* tp_call */
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392 0, /* tp_str */
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393 PyObject_GenericGetAttr, /* tp_getattro */
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394 PyObject_GenericSetAttr, /* tp_setattro */
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395 0, /* tp_as_buffer */
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396 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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397 Py_TPFLAGS_BASETYPE, /* tp_flags */
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398 module_doc, /* tp_doc */
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399 (traverseproc)module_traverse, /* tp_traverse */
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400 (inquiry)module_clear, /* tp_clear */
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401 0, /* tp_richcompare */
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402 0, /* tp_weaklistoffset */
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403 0, /* tp_iter */
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404 0, /* tp_iternext */
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405 0, /* tp_methods */
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406 module_members, /* tp_members */
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407 0, /* tp_getset */
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408 0, /* tp_base */
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409 0, /* tp_dict */
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410 0, /* tp_descr_get */
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411 0, /* tp_descr_set */
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412 offsetof(PyModuleObject, md_dict), /* tp_dictoffset */
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413 (initproc)module_init, /* tp_init */
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414 PyType_GenericAlloc, /* tp_alloc */
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415 PyType_GenericNew, /* tp_new */
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416 PyObject_GC_Del, /* tp_free */
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417 };