Mercurial > cpython-lru_cache-weakref

annotate Objects/iterobject.c @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents 757a121a27c2
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* Iterator objects */
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2
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3 #include "Python.h"
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4
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5 typedef struct {
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6 PyObject_HEAD
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7 Py_ssize_t it_index;
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8 PyObject *it_seq; /* Set to NULL when iterator is exhausted */
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9 } seqiterobject;
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10
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11 PyObject *
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12 PySeqIter_New(PyObject *seq)
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13 {
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14 seqiterobject *it;
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15
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16 if (!PySequence_Check(seq)) {
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17 PyErr_BadInternalCall();
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18 return NULL;
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19 }
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20 it = PyObject_GC_New(seqiterobject, &PySeqIter_Type);
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21 if (it == NULL)
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22 return NULL;
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23 it->it_index = 0;
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24 Py_INCREF(seq);
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25 it->it_seq = seq;
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26 _PyObject_GC_TRACK(it);
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27 return (PyObject *)it;
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28 }
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29
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30 static void
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31 iter_dealloc(seqiterobject *it)
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32 {
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33 _PyObject_GC_UNTRACK(it);
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34 Py_XDECREF(it->it_seq);
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35 PyObject_GC_Del(it);
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36 }
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37
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38 static int
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39 iter_traverse(seqiterobject *it, visitproc visit, void *arg)
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40 {
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41 Py_VISIT(it->it_seq);
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42 return 0;
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43 }
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44
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45 static PyObject *
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46 iter_iternext(PyObject *iterator)
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47 {
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48 seqiterobject *it;
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49 PyObject *seq;
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50 PyObject *result;
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51
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52 assert(PySeqIter_Check(iterator));
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53 it = (seqiterobject *)iterator;
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54 seq = it->it_seq;
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55 if (seq == NULL)
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56 return NULL;
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57
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58 result = PySequence_GetItem(seq, it->it_index);
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59 if (result != NULL) {
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60 it->it_index++;
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61 return result;
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62 }
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63 if (PyErr_ExceptionMatches(PyExc_IndexError) ||
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64 PyErr_ExceptionMatches(PyExc_StopIteration))
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65 {
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66 PyErr_Clear();
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67 Py_DECREF(seq);
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68 it->it_seq = NULL;
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69 }
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70 return NULL;
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71 }
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72
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73 static PyObject *
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74 iter_len(seqiterobject *it)
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75 {
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76 Py_ssize_t seqsize, len;
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77
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78 if (it->it_seq) {
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79 if (_PyObject_HasLen(it->it_seq)) {
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80 seqsize = PySequence_Size(it->it_seq);
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81 if (seqsize == -1)
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82 return NULL;
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83 }
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84 else {
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85 Py_RETURN_NOTIMPLEMENTED;
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86 }
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87 len = seqsize - it->it_index;
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88 if (len >= 0)
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89 return PyLong_FromSsize_t(len);
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90 }
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91 return PyLong_FromLong(0);
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92 }
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93
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94 PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
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95
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96 static PyObject *
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97 iter_reduce(seqiterobject *it)
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98 {
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99 if (it->it_seq != NULL)
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100 return Py_BuildValue("N(O)n", _PyObject_GetBuiltin("iter"),
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101 it->it_seq, it->it_index);
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102 else
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103 return Py_BuildValue("N(())", _PyObject_GetBuiltin("iter"));
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104 }
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105
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106 PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
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107
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108 static PyObject *
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109 iter_setstate(seqiterobject *it, PyObject *state)
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110 {
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111 Py_ssize_t index = PyLong_AsSsize_t(state);
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112 if (index == -1 && PyErr_Occurred())
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113 return NULL;
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114 if (it->it_seq != NULL) {
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115 if (index < 0)
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116 index = 0;
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117 it->it_index = index;
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118 }
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119 Py_RETURN_NONE;
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120 }
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121
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122 PyDoc_STRVAR(setstate_doc, "Set state information for unpickling.");
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123
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124 static PyMethodDef seqiter_methods[] = {
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125 {"__length_hint__", (PyCFunction)iter_len, METH_NOARGS, length_hint_doc},
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126 {"__reduce__", (PyCFunction)iter_reduce, METH_NOARGS, reduce_doc},
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127 {"__setstate__", (PyCFunction)iter_setstate, METH_O, setstate_doc},
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128 {NULL, NULL} /* sentinel */
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129 };
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130
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131 PyTypeObject PySeqIter_Type = {
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132 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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133 "iterator", /* tp_name */
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134 sizeof(seqiterobject), /* tp_basicsize */
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135 0, /* tp_itemsize */
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136 /* methods */
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137 (destructor)iter_dealloc, /* tp_dealloc */
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138 0, /* tp_print */
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139 0, /* tp_getattr */
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140 0, /* tp_setattr */
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141 0, /* tp_reserved */
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142 0, /* tp_repr */
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143 0, /* tp_as_number */
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144 0, /* tp_as_sequence */
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145 0, /* tp_as_mapping */
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146 0, /* tp_hash */
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147 0, /* tp_call */
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148 0, /* tp_str */
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149 PyObject_GenericGetAttr, /* tp_getattro */
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150 0, /* tp_setattro */
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151 0, /* tp_as_buffer */
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152 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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153 0, /* tp_doc */
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154 (traverseproc)iter_traverse, /* tp_traverse */
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155 0, /* tp_clear */
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156 0, /* tp_richcompare */
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157 0, /* tp_weaklistoffset */
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158 PyObject_SelfIter, /* tp_iter */
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159 iter_iternext, /* tp_iternext */
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160 seqiter_methods, /* tp_methods */
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161 0, /* tp_members */
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162 };
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163
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164 /* -------------------------------------- */
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165
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166 typedef struct {
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167 PyObject_HEAD
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168 PyObject *it_callable; /* Set to NULL when iterator is exhausted */
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169 PyObject *it_sentinel; /* Set to NULL when iterator is exhausted */
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170 } calliterobject;
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171
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172 PyObject *
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173 PyCallIter_New(PyObject *callable, PyObject *sentinel)
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174 {
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175 calliterobject *it;
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176 it = PyObject_GC_New(calliterobject, &PyCallIter_Type);
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177 if (it == NULL)
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178 return NULL;
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179 Py_INCREF(callable);
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180 it->it_callable = callable;
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181 Py_INCREF(sentinel);
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182 it->it_sentinel = sentinel;
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183 _PyObject_GC_TRACK(it);
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184 return (PyObject *)it;
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185 }
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186 static void
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187 calliter_dealloc(calliterobject *it)
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188 {
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189 _PyObject_GC_UNTRACK(it);
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190 Py_XDECREF(it->it_callable);
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191 Py_XDECREF(it->it_sentinel);
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192 PyObject_GC_Del(it);
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193 }
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194
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195 static int
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196 calliter_traverse(calliterobject *it, visitproc visit, void *arg)
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197 {
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198 Py_VISIT(it->it_callable);
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199 Py_VISIT(it->it_sentinel);
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200 return 0;
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201 }
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202
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203 static PyObject *
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204 calliter_iternext(calliterobject *it)
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205 {
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206 if (it->it_callable != NULL) {
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207 PyObject *args = PyTuple_New(0);
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208 PyObject *result;
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209 if (args == NULL)
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210 return NULL;
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211 result = PyObject_Call(it->it_callable, args, NULL);
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212 Py_DECREF(args);
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213 if (result != NULL) {
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214 int ok;
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215 ok = PyObject_RichCompareBool(it->it_sentinel, result, Py_EQ);
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216 if (ok == 0)
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217 return result; /* Common case, fast path */
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218 Py_DECREF(result);
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219 if (ok > 0) {
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220 Py_CLEAR(it->it_callable);
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221 Py_CLEAR(it->it_sentinel);
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222 }
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223 }
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224 else if (PyErr_ExceptionMatches(PyExc_StopIteration)) {
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225 PyErr_Clear();
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226 Py_CLEAR(it->it_callable);
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227 Py_CLEAR(it->it_sentinel);
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228 }
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229 }
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230 return NULL;
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231 }
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232
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233 static PyObject *
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234 calliter_reduce(calliterobject *it)
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235 {
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236 if (it->it_callable != NULL && it->it_sentinel != NULL)
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237 return Py_BuildValue("N(OO)", _PyObject_GetBuiltin("iter"),
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238 it->it_callable, it->it_sentinel);
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239 else
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240 return Py_BuildValue("N(())", _PyObject_GetBuiltin("iter"));
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241 }
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242
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243 static PyMethodDef calliter_methods[] = {
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244 {"__reduce__", (PyCFunction)calliter_reduce, METH_NOARGS, reduce_doc},
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245 {NULL, NULL} /* sentinel */
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246 };
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247
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248 PyTypeObject PyCallIter_Type = {
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249 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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250 "callable_iterator", /* tp_name */
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251 sizeof(calliterobject), /* tp_basicsize */
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252 0, /* tp_itemsize */
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253 /* methods */
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254 (destructor)calliter_dealloc, /* tp_dealloc */
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255 0, /* tp_print */
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256 0, /* tp_getattr */
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257 0, /* tp_setattr */
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258 0, /* tp_reserved */
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259 0, /* tp_repr */
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260 0, /* tp_as_number */
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261 0, /* tp_as_sequence */
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262 0, /* tp_as_mapping */
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263 0, /* tp_hash */
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264 0, /* tp_call */
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265 0, /* tp_str */
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266 PyObject_GenericGetAttr, /* tp_getattro */
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267 0, /* tp_setattro */
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268 0, /* tp_as_buffer */
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269 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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270 0, /* tp_doc */
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271 (traverseproc)calliter_traverse, /* tp_traverse */
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272 0, /* tp_clear */
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273 0, /* tp_richcompare */
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274 0, /* tp_weaklistoffset */
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275 PyObject_SelfIter, /* tp_iter */
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276 (iternextfunc)calliter_iternext, /* tp_iternext */
76091
4ff234337e24 Issue #14288: Serialization support for builtin iterators.
Kristján Valur Jónsson <kristjan@ccpgames.com>
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277 calliter_methods, /* tp_methods */
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c3bb0ff396dc Adding iterobject.[ch], which were accidentally not added. Sorry\!
Guido van Rossum <guido@python.org>
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278 };
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aca709f33a6a SF patch 1546297 (with some tweaks):
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279
aca709f33a6a SF patch 1546297 (with some tweaks):
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280