Mercurial > cpython-lru_cache-weakref

annotate Python/symtable.c @ 32974:fb6ffd290cfb legacy-trunk

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SF patch #980695: efficient string concatenation (Original patch by Armin Rigo).
author Raymond Hettinger <python@rcn.com>
date Fri, 06 Aug 2004 18:43:09 +0000
parents 302d399cfd37
children 1c4d192f1568
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "Python.h"
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08d937107fe6 Improved __future__ parser; still more to do
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2 #include "compile.h"
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3 #include "symtable.h"
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4 #include "graminit.h"
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5 #include "structmember.h"
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6
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8a26bb369f53 Add a comment explaining the st_symbols cache.
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7 /* The compiler uses this function to load a PySymtableEntry object
8a26bb369f53 Add a comment explaining the st_symbols cache.
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8 for a code block. Each block is loaded twice, once during the
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9 symbol table pass and once during the code gen pass. Entries
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10 created during the first pass are cached for the second pass, using
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11 the st_symbols dictionary.
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12
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13 The cache is keyed by st_nscopes. Each code block node in a
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14 module's parse tree can be assigned a unique id based on the order
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15 in which the nodes are visited by the compiler. This strategy
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16 works so long as the symbol table and codegen passes visit the same
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17 nodes in the same order.
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18 */
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19
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20
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21 PyObject *
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22 PySymtableEntry_New(struct symtable *st, char *name, int type, int lineno)
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23 {
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24 PySymtableEntryObject *ste = NULL;
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25 PyObject *k, *v;
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26
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27 k = PyInt_FromLong(st->st_nscopes++);
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28 if (k == NULL)
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29 goto fail;
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30 v = PyDict_GetItem(st->st_symbols, k);
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31 if (v) {
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4d5098cfa781 PySymtableEntry_New(): I'm not sure what this routine is doing, but it
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32 Py_DECREF(k);
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33 Py_INCREF(v);
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34 return v;
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35 }
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36
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37 ste = (PySymtableEntryObject *)PyObject_New(PySymtableEntryObject,
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38 &PySymtableEntry_Type);
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39 ste->ste_table = st;
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40 ste->ste_id = k;
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41
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42 v = PyString_FromString(name);
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43 if (v == NULL)
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44 goto fail;
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45 ste->ste_name = v;
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46
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47 v = PyDict_New();
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48 if (v == NULL)
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49 goto fail;
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50 ste->ste_symbols = v;
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51
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52 v = PyList_New(0);
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53 if (v == NULL)
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54 goto fail;
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55 ste->ste_varnames = v;
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56
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57 v = PyList_New(0);
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58 if (v == NULL)
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59 goto fail;
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60 ste->ste_children = v;
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61
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62 ste->ste_optimized = 0;
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63 ste->ste_opt_lineno = 0;
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3aaf24b949df Backport fix for SF bug 734869 and sundry compiler cleanups.
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64 ste->ste_tmpname = 0;
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65 ste->ste_lineno = lineno;
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66 switch (type) {
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67 case funcdef:
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68 case lambdef:
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69 case testlist_gexp: /* generator expression */
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70 case argument: /* generator expression */
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71 ste->ste_type = TYPE_FUNCTION;
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72 break;
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73 case classdef:
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74 ste->ste_type = TYPE_CLASS;
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75 break;
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76 case single_input:
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77 case eval_input:
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78 case file_input:
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79 ste->ste_type = TYPE_MODULE;
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80 break;
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81 }
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82
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83 if (st->st_cur == NULL)
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84 ste->ste_nested = 0;
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85 else if (st->st_cur->ste_nested
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86 || st->st_cur->ste_type == TYPE_FUNCTION)
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87 ste->ste_nested = 1;
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88 else
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89 ste->ste_nested = 0;
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90 ste->ste_child_free = 0;
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7bc473b2c654 Merging the gen-branch into the main line, at Guido's direction. Yay!
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91 ste->ste_generator = 0;
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92
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93 if (PyDict_SetItem(st->st_symbols, ste->ste_id, (PyObject *)ste) < 0)
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94 goto fail;
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95
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96 return (PyObject *)ste;
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97 fail:
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98 Py_XDECREF(ste);
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99 return NULL;
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100 }
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101
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102 static PyObject *
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103 ste_repr(PySymtableEntryObject *ste)
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104 {
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105 char buf[256];
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106
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107 PyOS_snprintf(buf, sizeof(buf),
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108 "<symtable entry %.100s(%ld), line %d>",
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109 PyString_AS_STRING(ste->ste_name),
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110 PyInt_AS_LONG(ste->ste_id),
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111 ste->ste_lineno);
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112 return PyString_FromString(buf);
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113 }
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114
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115 static void
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116 ste_dealloc(PySymtableEntryObject *ste)
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117 {
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118 ste->ste_table = NULL;
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119 Py_XDECREF(ste->ste_id);
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120 Py_XDECREF(ste->ste_name);
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121 Py_XDECREF(ste->ste_symbols);
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122 Py_XDECREF(ste->ste_varnames);
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123 Py_XDECREF(ste->ste_children);
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124 PyObject_Del(ste);
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125 }
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126
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127 #define OFF(x) offsetof(PySymtableEntryObject, x)
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128
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129 static PyMemberDef ste_memberlist[] = {
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130 {"id", T_OBJECT, OFF(ste_id), READONLY},
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131 {"name", T_OBJECT, OFF(ste_name), READONLY},
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132 {"symbols", T_OBJECT, OFF(ste_symbols), READONLY},
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133 {"varnames", T_OBJECT, OFF(ste_varnames), READONLY},
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134 {"children", T_OBJECT, OFF(ste_children), READONLY},
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135 {"type", T_INT, OFF(ste_type), READONLY},
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136 {"lineno", T_INT, OFF(ste_lineno), READONLY},
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137 {"optimized",T_INT, OFF(ste_optimized), READONLY},
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138 {"nested", T_INT, OFF(ste_nested), READONLY},
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139 {NULL}
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140 };
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141
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142 PyTypeObject PySymtableEntry_Type = {
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143 PyObject_HEAD_INIT(&PyType_Type)
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144 0,
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145 "symtable entry",
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146 sizeof(PySymtableEntryObject),
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147 0,
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148 (destructor)ste_dealloc, /* tp_dealloc */
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149 0, /* tp_print */
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150 0, /* tp_getattr */
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151 0, /* tp_setattr */
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152 0, /* tp_compare */
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153 (reprfunc)ste_repr, /* tp_repr */
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154 0, /* tp_as_number */
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155 0, /* tp_as_sequence */
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156 0, /* tp_as_mapping */
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157 0, /* tp_hash */
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158 0, /* tp_call */
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159 0, /* tp_str */
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160 PyObject_GenericGetAttr, /* tp_getattro */
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161 0, /* tp_setattro */
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162 0, /* tp_as_buffer */
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163 Py_TPFLAGS_DEFAULT, /* tp_flags */
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164 0, /* tp_doc */
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165 0, /* tp_traverse */
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166 0, /* tp_clear */
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167 0, /* tp_richcompare */
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168 0, /* tp_weaklistoffset */
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169 0, /* tp_iter */
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170 0, /* tp_iternext */
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171 0, /* tp_methods */
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172 ste_memberlist, /* tp_members */
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173 0, /* tp_getset */
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174 0, /* tp_base */
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175 0, /* tp_dict */
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176 0, /* tp_descr_get */
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177 0, /* tp_descr_set */
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178 0, /* tp_dictoffset */
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179 0, /* tp_init */
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180 0, /* tp_alloc */
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181 0, /* tp_new */
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182 };