Mercurial > cpython-lru_cache-weakref

annotate Objects/structseq.c @ 68043:cd14782886ca 3.2

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Merged revisions 88652 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r88652 | antoine.pitrou | 2011-02-26 16:58:05 +0100 (sam., 26 févr. 2011) | 4 lines Issue #9931: Fix hangs in GUI tests under Windows in certain conditions. Patch by Hirokazu Yamamoto. ........
author Antoine Pitrou <solipsis@pitrou.net>
date Sat, 26 Feb 2011 16:49:08 +0000
parents 62b61abd02b8
children 6454e5de7c34
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1 /* Implementation helper: a struct that looks like a tuple. See timemodule
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2 and posixmodule for example uses. */
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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 char visible_length_key[] = "n_sequence_fields";
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8 static char real_length_key[] = "n_fields";
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9 static char unnamed_fields_key[] = "n_unnamed_fields";
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10
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11 /* Fields with this name have only a field index, not a field name.
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12 They are only allowed for indices < n_visible_fields. */
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13 char *PyStructSequence_UnnamedField = "unnamed field";
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14
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15 #define VISIBLE_SIZE(op) Py_SIZE(op)
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16 #define VISIBLE_SIZE_TP(tp) PyLong_AsLong( \
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17 PyDict_GetItemString((tp)->tp_dict, visible_length_key))
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19 #define REAL_SIZE_TP(tp) PyLong_AsLong( \
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20 PyDict_GetItemString((tp)->tp_dict, real_length_key))
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21 #define REAL_SIZE(op) REAL_SIZE_TP(Py_TYPE(op))
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23 #define UNNAMED_FIELDS_TP(tp) PyLong_AsLong( \
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24 PyDict_GetItemString((tp)->tp_dict, unnamed_fields_key))
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25 #define UNNAMED_FIELDS(op) UNNAMED_FIELDS_TP(Py_TYPE(op))
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27
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28 PyObject *
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29 PyStructSequence_New(PyTypeObject *type)
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30 {
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31 PyStructSequence *obj;
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32 Py_ssize_t size = REAL_SIZE_TP(type), i;
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33
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34 obj = PyObject_GC_NewVar(PyStructSequence, type, size);
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35 if (obj == NULL)
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36 return NULL;
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37 /* Hack the size of the variable object, so invisible fields don't appear
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38 to Python code. */
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39 Py_SIZE(obj) = VISIBLE_SIZE_TP(type);
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40 for (i = 0; i < size; i++)
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41 obj->ob_item[i] = NULL;
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42
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43 return (PyObject*)obj;
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44 }
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45
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46 void
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47 PyStructSequence_SetItem(PyObject* op, Py_ssize_t i, PyObject* v)
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48 {
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49 PyStructSequence_SET_ITEM(op, i, v);
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50 }
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51
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52 PyObject*
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53 PyStructSequence_GetItem(PyObject* op, Py_ssize_t i)
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54 {
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55 return PyStructSequence_GET_ITEM(op, i);
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56 }
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57
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58 static void
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59 structseq_dealloc(PyStructSequence *obj)
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60 {
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61 Py_ssize_t i, size;
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62
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63 size = REAL_SIZE(obj);
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64 for (i = 0; i < size; ++i) {
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65 Py_XDECREF(obj->ob_item[i]);
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66 }
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67 PyObject_GC_Del(obj);
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68 }
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69
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70 static PyObject *
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71 structseq_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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72 {
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73 PyObject *arg = NULL;
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74 PyObject *dict = NULL;
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75 PyObject *ob;
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76 PyStructSequence *res = NULL;
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77 Py_ssize_t len, min_len, max_len, i, n_unnamed_fields;
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78 static char *kwlist[] = {"sequence", "dict", 0};
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79
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80 if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O:structseq",
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81 kwlist, &arg, &dict))
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82 return NULL;
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83
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84 arg = PySequence_Fast(arg, "constructor requires a sequence");
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85
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86 if (!arg) {
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87 return NULL;
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88 }
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89
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90 if (dict && !PyDict_Check(dict)) {
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91 PyErr_Format(PyExc_TypeError,
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92 "%.500s() takes a dict as second arg, if any",
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93 type->tp_name);
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94 Py_DECREF(arg);
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95 return NULL;
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96 }
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97
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98 len = PySequence_Fast_GET_SIZE(arg);
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99 min_len = VISIBLE_SIZE_TP(type);
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100 max_len = REAL_SIZE_TP(type);
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101 n_unnamed_fields = UNNAMED_FIELDS_TP(type);
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102
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103 if (min_len != max_len) {
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104 if (len < min_len) {
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105 PyErr_Format(PyExc_TypeError,
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106 "%.500s() takes an at least %zd-sequence (%zd-sequence given)",
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107 type->tp_name, min_len, len);
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108 Py_DECREF(arg);
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109 return NULL;
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110 }
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111
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112 if (len > max_len) {
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113 PyErr_Format(PyExc_TypeError,
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114 "%.500s() takes an at most %zd-sequence (%zd-sequence given)",
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115 type->tp_name, max_len, len);
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116 Py_DECREF(arg);
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117 return NULL;
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118 }
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119 }
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120 else {
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121 if (len != min_len) {
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122 PyErr_Format(PyExc_TypeError,
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123 "%.500s() takes a %zd-sequence (%zd-sequence given)",
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124 type->tp_name, min_len, len);
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125 Py_DECREF(arg);
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126 return NULL;
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127 }
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128 }
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129
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130 res = (PyStructSequence*) PyStructSequence_New(type);
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131 if (res == NULL) {
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132 return NULL;
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133 }
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134 for (i = 0; i < len; ++i) {
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135 PyObject *v = PySequence_Fast_GET_ITEM(arg, i);
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136 Py_INCREF(v);
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137 res->ob_item[i] = v;
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138 }
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139 for (; i < max_len; ++i) {
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140 if (dict && (ob = PyDict_GetItemString(
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141 dict, type->tp_members[i-n_unnamed_fields].name))) {
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142 }
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143 else {
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144 ob = Py_None;
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145 }
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146 Py_INCREF(ob);
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147 res->ob_item[i] = ob;
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148 }
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149
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150 Py_DECREF(arg);
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151 return (PyObject*) res;
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152 }
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153
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154
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155 static PyObject *
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156 structseq_repr(PyStructSequence *obj)
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157 {
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158 /* buffer and type size were chosen well considered. */
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159 #define REPR_BUFFER_SIZE 512
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160 #define TYPE_MAXSIZE 100
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161
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162 PyTypeObject *typ = Py_TYPE(obj);
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163 int i, removelast = 0;
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164 Py_ssize_t len;
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165 char buf[REPR_BUFFER_SIZE];
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166 char *endofbuf, *pbuf = buf;
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167
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168 /* pointer to end of writeable buffer; safes space for "...)\0" */
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169 endofbuf= &buf[REPR_BUFFER_SIZE-5];
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170
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171 /* "typename(", limited to TYPE_MAXSIZE */
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172 len = strlen(typ->tp_name) > TYPE_MAXSIZE ? TYPE_MAXSIZE :
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173 strlen(typ->tp_name);
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174 strncpy(pbuf, typ->tp_name, len);
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175 pbuf += len;
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176 *pbuf++ = '(';
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177
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178 for (i=0; i < VISIBLE_SIZE(obj); i++) {
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179 PyObject *val, *repr;
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180 char *cname, *crepr;
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181
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182 cname = typ->tp_members[i].name;
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183 if (cname == NULL) {
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184 PyErr_Format(PyExc_SystemError, "In structseq_repr(), member %d name is NULL"
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185 " for type %.500s", i, typ->tp_name);
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186 return NULL;
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187 }
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188 val = PyStructSequence_GET_ITEM(obj, i);
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189 repr = PyObject_Repr(val);
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190 if (repr == NULL)
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191 return NULL;
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192 crepr = _PyUnicode_AsString(repr);
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193 if (crepr == NULL) {
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194 Py_DECREF(repr);
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195 return NULL;
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196 }
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197
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198 /* + 3: keep space for "=" and ", " */
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199 len = strlen(cname) + strlen(crepr) + 3;
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200 if ((pbuf+len) <= endofbuf) {
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201 strcpy(pbuf, cname);
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202 pbuf += strlen(cname);
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203 *pbuf++ = '=';
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204 strcpy(pbuf, crepr);
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205 pbuf += strlen(crepr);
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206 *pbuf++ = ',';
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207 *pbuf++ = ' ';
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208 removelast = 1;
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209 Py_DECREF(repr);
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210 }
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211 else {
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212 strcpy(pbuf, "...");
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213 pbuf += 3;
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214 removelast = 0;
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215 Py_DECREF(repr);
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216 break;
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217 }
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218 }
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219 if (removelast) {
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220 /* overwrite last ", " */
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221 pbuf-=2;
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222 }
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223 *pbuf++ = ')';
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224 *pbuf = '\0';
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225
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226 return PyUnicode_FromString(buf);
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227 }
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228
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229 static PyObject *
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230 structseq_reduce(PyStructSequence* self)
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231 {
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232 PyObject* tup;
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233 PyObject* dict;
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234 PyObject* result;
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235 Py_ssize_t n_fields, n_visible_fields, n_unnamed_fields;
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236 int i;
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237
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238 n_fields = REAL_SIZE(self);
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239 n_visible_fields = VISIBLE_SIZE(self);
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240 n_unnamed_fields = UNNAMED_FIELDS(self);
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241 tup = PyTuple_New(n_visible_fields);
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242 if (!tup) {
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243 return NULL;
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244 }
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245
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246 dict = PyDict_New();
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247 if (!dict) {
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248 Py_DECREF(tup);
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249 return NULL;
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250 }
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251
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252 for (i = 0; i < n_visible_fields; i++) {
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253 Py_INCREF(self->ob_item[i]);
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254 PyTuple_SET_ITEM(tup, i, self->ob_item[i]);
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255 }
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256
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257 for (; i < n_fields; i++) {
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258 char *n = Py_TYPE(self)->tp_members[i-n_unnamed_fields].name;
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259 PyDict_SetItemString(dict, n,
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260 self->ob_item[i]);
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261 }
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262
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263 result = Py_BuildValue("(O(OO))", Py_TYPE(self), tup, dict);
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264
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265 Py_DECREF(tup);
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266 Py_DECREF(dict);
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267
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268 return result;
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269 }
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270
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271 static PyMethodDef structseq_methods[] = {
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272 {"__reduce__", (PyCFunction)structseq_reduce, METH_NOARGS, NULL},
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273 {NULL, NULL}
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274 };
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275
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276 static PyTypeObject _struct_sequence_template = {
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277 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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278 NULL, /* tp_name */
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279 sizeof(PyStructSequence) - sizeof(PyObject *), /* tp_basicsize */
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280 sizeof(PyObject *), /* tp_itemsize */
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281 (destructor)structseq_dealloc, /* tp_dealloc */
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282 0, /* tp_print */
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283 0, /* tp_getattr */
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284 0, /* tp_setattr */
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285 0, /* tp_reserved */
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286 (reprfunc)structseq_repr, /* tp_repr */
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287 0, /* tp_as_number */
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288 0, /* tp_as_sequence */
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289 0, /* tp_as_mapping */
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290 0, /* tp_hash */
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291 0, /* tp_call */
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292 0, /* tp_str */
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293 0, /* tp_getattro */
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294 0, /* tp_setattro */
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295 0, /* tp_as_buffer */
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296 Py_TPFLAGS_DEFAULT, /* tp_flags */
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297 NULL, /* tp_doc */
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298 0, /* tp_traverse */
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299 0, /* tp_clear */
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300 0, /* tp_richcompare */
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301 0, /* tp_weaklistoffset */
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302 0, /* tp_iter */
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303 0, /* tp_iternext */
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304 structseq_methods, /* tp_methods */
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305 NULL, /* tp_members */
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306 0, /* tp_getset */
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307 0, /* tp_base */
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308 0, /* tp_dict */
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309 0, /* tp_descr_get */
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310 0, /* tp_descr_set */
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311 0, /* tp_dictoffset */
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312 0, /* tp_init */
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313 0, /* tp_alloc */
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314 structseq_new, /* tp_new */
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315 };
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316
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317 void
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318 PyStructSequence_InitType(PyTypeObject *type, PyStructSequence_Desc *desc)
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319 {
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320 PyObject *dict;
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321 PyMemberDef* members;
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322 int n_members, n_unnamed_members, i, k;
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323
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324 #ifdef Py_TRACE_REFS
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325 /* if the type object was chained, unchain it first
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326 before overwriting its storage */
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327 if (type->ob_base.ob_base._ob_next) {
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328 _Py_ForgetReference((PyObject*)type);
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329 }
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330 #endif
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331
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332 n_unnamed_members = 0;
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333 for (i = 0; desc->fields[i].name != NULL; ++i)
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334 if (desc->fields[i].name == PyStructSequence_UnnamedField)
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335 n_unnamed_members++;
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336 n_members = i;
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337
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338 memcpy(type, &_struct_sequence_template, sizeof(PyTypeObject));
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339 type->tp_base = &PyTuple_Type;
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340 type->tp_name = desc->name;
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341 type->tp_doc = desc->doc;
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342
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343 members = PyMem_NEW(PyMemberDef, n_members-n_unnamed_members+1);
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344 if (members == NULL)
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345 return;
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346
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347 for (i = k = 0; i < n_members; ++i) {
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348 if (desc->fields[i].name == PyStructSequence_UnnamedField)
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349 continue;
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350 members[k].name = desc->fields[i].name;
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351 members[k].type = T_OBJECT;
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352 members[k].offset = offsetof(PyStructSequence, ob_item)
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353 + i * sizeof(PyObject*);
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354 members[k].flags = READONLY;
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355 members[k].doc = desc->fields[i].doc;
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356 k++;
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357 }
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358 members[k].name = NULL;
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359
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360 type->tp_members = members;
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361
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362 if (PyType_Ready(type) < 0)
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363 return;
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364 Py_INCREF(type);
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365
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366 dict = type->tp_dict;
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367 #define SET_DICT_FROM_INT(key, value) \
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368 do { \
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369 PyObject *v = PyLong_FromLong((long) value); \
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370 if (v != NULL) { \
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371 PyDict_SetItemString(dict, key, v); \
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372 Py_DECREF(v); \
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373 } \
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374 } while (0)
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375
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376 SET_DICT_FROM_INT(visible_length_key, desc->n_in_sequence);
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377 SET_DICT_FROM_INT(real_length_key, n_members);
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378 SET_DICT_FROM_INT(unnamed_fields_key, n_unnamed_members);
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379 }
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380
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381 PyTypeObject*
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382 PyStructSequence_NewType(PyStructSequence_Desc *desc)
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383 {
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384 PyTypeObject *result = (PyTypeObject*)PyType_GenericAlloc(&PyType_Type, 0);
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385 PyStructSequence_InitType(result, desc);
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386 return result;
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387 }