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annotate Objects/tupleobject.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 f9f782f2369e e2f96bd29252
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1
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2 /* Tuple object implementation */
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3
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4 #include "Python.h"
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5
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6 /* Speed optimization to avoid frequent malloc/free of small tuples */
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7 #ifndef PyTuple_MAXSAVESIZE
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8 #define PyTuple_MAXSAVESIZE 20 /* Largest tuple to save on free list */
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9 #endif
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10 #ifndef PyTuple_MAXFREELIST
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11 #define PyTuple_MAXFREELIST 2000 /* Maximum number of tuples of each size to save */
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12 #endif
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13
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14 #if PyTuple_MAXSAVESIZE > 0
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15 /* Entries 1 up to PyTuple_MAXSAVESIZE are free lists, entry 0 is the empty
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16 tuple () of which at most one instance will be allocated.
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17 */
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18 static PyTupleObject *free_list[PyTuple_MAXSAVESIZE];
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19 static int numfree[PyTuple_MAXSAVESIZE];
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20 #endif
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21 #ifdef COUNT_ALLOCS
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22 Py_ssize_t fast_tuple_allocs;
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23 Py_ssize_t tuple_zero_allocs;
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24 #endif
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25
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26 /* Debug statistic to count GC tracking of tuples.
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27 Please note that tuples are only untracked when considered by the GC, and
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28 many of them will be dead before. Therefore, a tracking rate close to 100%
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29 does not necessarily prove that the heuristic is inefficient.
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30 */
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31 #ifdef SHOW_TRACK_COUNT
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32 static Py_ssize_t count_untracked = 0;
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33 static Py_ssize_t count_tracked = 0;
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34
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35 static void
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36 show_track(void)
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37 {
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38 fprintf(stderr, "Tuples created: %" PY_FORMAT_SIZE_T "d\n",
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39 count_tracked + count_untracked);
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40 fprintf(stderr, "Tuples tracked by the GC: %" PY_FORMAT_SIZE_T
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41 "d\n", count_tracked);
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42 fprintf(stderr, "%.2f%% tuple tracking rate\n\n",
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43 (100.0*count_tracked/(count_untracked+count_tracked)));
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44 }
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45 #endif
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46
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47
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48 PyObject *
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49 PyTuple_New(register Py_ssize_t size)
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50 {
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51 register PyTupleObject *op;
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52 Py_ssize_t i;
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53 if (size < 0) {
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54 PyErr_BadInternalCall();
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55 return NULL;
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56 }
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57 #if PyTuple_MAXSAVESIZE > 0
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58 if (size == 0 && free_list[0]) {
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59 op = free_list[0];
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60 Py_INCREF(op);
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61 #ifdef COUNT_ALLOCS
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62 tuple_zero_allocs++;
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63 #endif
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64 return (PyObject *) op;
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65 }
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66 if (size < PyTuple_MAXSAVESIZE && (op = free_list[size]) != NULL) {
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67 free_list[size] = (PyTupleObject *) op->ob_item[0];
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68 numfree[size]--;
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69 #ifdef COUNT_ALLOCS
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70 fast_tuple_allocs++;
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71 #endif
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72 /* Inline PyObject_InitVar */
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73 #ifdef Py_TRACE_REFS
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74 Py_SIZE(op) = size;
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75 Py_TYPE(op) = &PyTuple_Type;
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76 #endif
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77 _Py_NewReference((PyObject *)op);
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78 }
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79 else
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80 #endif
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81 {
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82 Py_ssize_t nbytes = size * sizeof(PyObject *);
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83 /* Check for overflow */
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84 if (nbytes / sizeof(PyObject *) != (size_t)size ||
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85 (nbytes > PY_SSIZE_T_MAX - sizeof(PyTupleObject) - sizeof(PyObject *)))
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86 {
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87 return PyErr_NoMemory();
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88 }
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89 nbytes += sizeof(PyTupleObject) - sizeof(PyObject *);
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90
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91 op = PyObject_GC_NewVar(PyTupleObject, &PyTuple_Type, size);
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92 if (op == NULL)
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93 return NULL;
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94 }
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95 for (i=0; i < size; i++)
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96 op->ob_item[i] = NULL;
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97 #if PyTuple_MAXSAVESIZE > 0
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98 if (size == 0) {
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99 free_list[0] = op;
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100 ++numfree[0];
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101 Py_INCREF(op); /* extra INCREF so that this is never freed */
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102 }
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103 #endif
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104 #ifdef SHOW_TRACK_COUNT
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105 count_tracked++;
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106 #endif
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107 _PyObject_GC_TRACK(op);
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108 return (PyObject *) op;
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109 }
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110
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111 Py_ssize_t
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112 PyTuple_Size(register PyObject *op)
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113 {
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114 if (!PyTuple_Check(op)) {
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115 PyErr_BadInternalCall();
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116 return -1;
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117 }
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118 else
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119 return Py_SIZE(op);
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120 }
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121
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122 PyObject *
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123 PyTuple_GetItem(register PyObject *op, register Py_ssize_t i)
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124 {
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125 if (!PyTuple_Check(op)) {
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126 PyErr_BadInternalCall();
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127 return NULL;
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128 }
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129 if (i < 0 || i >= Py_SIZE(op)) {
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130 PyErr_SetString(PyExc_IndexError, "tuple index out of range");
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131 return NULL;
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132 }
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133 return ((PyTupleObject *)op) -> ob_item[i];
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134 }
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135
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136 int
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137 PyTuple_SetItem(register PyObject *op, register Py_ssize_t i, PyObject *newitem)
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138 {
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139 register PyObject *olditem;
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140 register PyObject **p;
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141 if (!PyTuple_Check(op) || op->ob_refcnt != 1) {
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142 Py_XDECREF(newitem);
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143 PyErr_BadInternalCall();
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144 return -1;
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145 }
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146 if (i < 0 || i >= Py_SIZE(op)) {
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147 Py_XDECREF(newitem);
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148 PyErr_SetString(PyExc_IndexError,
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149 "tuple assignment index out of range");
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150 return -1;
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151 }
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152 p = ((PyTupleObject *)op) -> ob_item + i;
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153 olditem = *p;
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154 *p = newitem;
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155 Py_XDECREF(olditem);
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156 return 0;
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157 }
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158
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159 void
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160 _PyTuple_MaybeUntrack(PyObject *op)
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161 {
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162 PyTupleObject *t;
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163 Py_ssize_t i, n;
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164
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165 if (!PyTuple_CheckExact(op) || !_PyObject_GC_IS_TRACKED(op))
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166 return;
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167 t = (PyTupleObject *) op;
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168 n = Py_SIZE(t);
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169 for (i = 0; i < n; i++) {
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170 PyObject *elt = PyTuple_GET_ITEM(t, i);
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171 /* Tuple with NULL elements aren't
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172 fully constructed, don't untrack
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173 them yet. */
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174 if (!elt ||
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175 _PyObject_GC_MAY_BE_TRACKED(elt))
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176 return;
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177 }
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178 #ifdef SHOW_TRACK_COUNT
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179 count_tracked--;
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180 count_untracked++;
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181 #endif
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182 _PyObject_GC_UNTRACK(op);
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183 }
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184
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185 PyObject *
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186 PyTuple_Pack(Py_ssize_t n, ...)
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187 {
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188 Py_ssize_t i;
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189 PyObject *o;
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190 PyObject *result;
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191 PyObject **items;
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192 va_list vargs;
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193
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194 va_start(vargs, n);
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195 result = PyTuple_New(n);
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196 if (result == NULL)
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197 return NULL;
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198 items = ((PyTupleObject *)result)->ob_item;
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199 for (i = 0; i < n; i++) {
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200 o = va_arg(vargs, PyObject *);
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201 Py_INCREF(o);
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202 items[i] = o;
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203 }
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204 va_end(vargs);
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205 return result;
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206 }
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207
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208
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209 /* Methods */
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210
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211 static void
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212 tupledealloc(register PyTupleObject *op)
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213 {
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214 register Py_ssize_t i;
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215 register Py_ssize_t len = Py_SIZE(op);
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216 PyObject_GC_UnTrack(op);
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217 Py_TRASHCAN_SAFE_BEGIN(op)
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218 if (len > 0) {
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219 i = len;
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220 while (--i >= 0)
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221 Py_XDECREF(op->ob_item[i]);
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222 #if PyTuple_MAXSAVESIZE > 0
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223 if (len < PyTuple_MAXSAVESIZE &&
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224 numfree[len] < PyTuple_MAXFREELIST &&
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225 Py_TYPE(op) == &PyTuple_Type)
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226 {
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227 op->ob_item[0] = (PyObject *) free_list[len];
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228 numfree[len]++;
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229 free_list[len] = op;
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230 goto done; /* return */
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231 }
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232 #endif
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233 }
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234 Py_TYPE(op)->tp_free((PyObject *)op);
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235 done:
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236 Py_TRASHCAN_SAFE_END(op)
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237 }
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238
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239 static PyObject *
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240 tuplerepr(PyTupleObject *v)
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241 {
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242 Py_ssize_t i, n;
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243 PyObject *s, *temp;
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244 PyObject *pieces, *result = NULL;
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245
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246 n = Py_SIZE(v);
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247 if (n == 0)
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248 return PyUnicode_FromString("()");
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249
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250 /* While not mutable, it is still possible to end up with a cycle in a
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251 tuple through an object that stores itself within a tuple (and thus
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252 infinitely asks for the repr of itself). This should only be
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253 possible within a type. */
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254 i = Py_ReprEnter((PyObject *)v);
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255 if (i != 0) {
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256 return i > 0 ? PyUnicode_FromString("(...)") : NULL;
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257 }
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258
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259 pieces = PyTuple_New(n);
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260 if (pieces == NULL)
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261 return NULL;
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262
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263 /* Do repr() on each element. */
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264 for (i = 0; i < n; ++i) {
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265 if (Py_EnterRecursiveCall(" while getting the repr of a tuple"))
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266 goto Done;
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267 s = PyObject_Repr(v->ob_item[i]);
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268 Py_LeaveRecursiveCall();
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269 if (s == NULL)
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270 goto Done;
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271 PyTuple_SET_ITEM(pieces, i, s);
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272 }
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273
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274 /* Add "()" decorations to the first and last items. */
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275 assert(n > 0);
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276 s = PyUnicode_FromString("(");
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277 if (s == NULL)
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278 goto Done;
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279 temp = PyTuple_GET_ITEM(pieces, 0);
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280 PyUnicode_AppendAndDel(&s, temp);
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281 PyTuple_SET_ITEM(pieces, 0, s);
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282 if (s == NULL)
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283 goto Done;
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284
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285 s = PyUnicode_FromString(n == 1 ? ",)" : ")");
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286 if (s == NULL)
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287 goto Done;
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288 temp = PyTuple_GET_ITEM(pieces, n-1);
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289 PyUnicode_AppendAndDel(&temp, s);
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290 PyTuple_SET_ITEM(pieces, n-1, temp);
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291 if (temp == NULL)
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292 goto Done;
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293
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294 /* Paste them all together with ", " between. */
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295 s = PyUnicode_FromString(", ");
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296 if (s == NULL)
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297 goto Done;
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298 result = PyUnicode_Join(s, pieces);
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299 Py_DECREF(s);
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300
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301 Done:
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302 Py_DECREF(pieces);
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303 Py_ReprLeave((PyObject *)v);
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304 return result;
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305 }
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306
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307 /* The addend 82520, was selected from the range(0, 1000000) for
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308 generating the greatest number of prime multipliers for tuples
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309 upto length eight:
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310
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311 1082527, 1165049, 1082531, 1165057, 1247581, 1330103, 1082533,
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312 1330111, 1412633, 1165069, 1247599, 1495177, 1577699
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313 */
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314
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315 static Py_hash_t
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316 tuplehash(PyTupleObject *v)
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317 {
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318 register Py_hash_t x, y;
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319 register Py_ssize_t len = Py_SIZE(v);
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320 register PyObject **p;
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321 Py_hash_t mult = 1000003L;
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322 x = 0x345678L;
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323 p = v->ob_item;
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324 while (--len >= 0) {
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325 y = PyObject_Hash(*p++);
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326 if (y == -1)
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327 return -1;
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328 x = (x ^ y) * mult;
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329 /* the cast might truncate len; that doesn't change hash stability */
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330 mult += (Py_hash_t)(82520L + len + len);
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331 }
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332 x += 97531L;
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333 if (x == -1)
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334 x = -2;
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335 return x;
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336 }
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337
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338 static Py_ssize_t
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339 tuplelength(PyTupleObject *a)
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340 {
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341 return Py_SIZE(a);
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342 }
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343
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344 static int
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345 tuplecontains(PyTupleObject *a, PyObject *el)
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346 {
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347 Py_ssize_t i;
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348 int cmp;
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349
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350 for (i = 0, cmp = 0 ; cmp == 0 && i < Py_SIZE(a); ++i)
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351 cmp = PyObject_RichCompareBool(el, PyTuple_GET_ITEM(a, i),
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352 Py_EQ);
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353 return cmp;
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354 }
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355
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356 static PyObject *
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357 tupleitem(register PyTupleObject *a, register Py_ssize_t i)
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358 {
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359 if (i < 0 || i >= Py_SIZE(a)) {
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360 PyErr_SetString(PyExc_IndexError, "tuple index out of range");
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361 return NULL;
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362 }
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363 Py_INCREF(a->ob_item[i]);
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364 return a->ob_item[i];
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365 }
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366
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367 static PyObject *
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368 tupleslice(register PyTupleObject *a, register Py_ssize_t ilow,
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369 register Py_ssize_t ihigh)
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370 {
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371 register PyTupleObject *np;
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372 PyObject **src, **dest;
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373 register Py_ssize_t i;
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374 Py_ssize_t len;
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375 if (ilow < 0)
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376 ilow = 0;
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377 if (ihigh > Py_SIZE(a))
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378 ihigh = Py_SIZE(a);
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379 if (ihigh < ilow)
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380 ihigh = ilow;
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381 if (ilow == 0 && ihigh == Py_SIZE(a) && PyTuple_CheckExact(a)) {
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382 Py_INCREF(a);
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383 return (PyObject *)a;
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384 }
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385 len = ihigh - ilow;
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386 np = (PyTupleObject *)PyTuple_New(len);
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387 if (np == NULL)
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388 return NULL;
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389 src = a->ob_item + ilow;
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390 dest = np->ob_item;
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391 for (i = 0; i < len; i++) {
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392 PyObject *v = src[i];
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393 Py_INCREF(v);
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394 dest[i] = v;
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395 }
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396 return (PyObject *)np;
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397 }
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398
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399 PyObject *
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400 PyTuple_GetSlice(PyObject *op, Py_ssize_t i, Py_ssize_t j)
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401 {
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402 if (op == NULL || !PyTuple_Check(op)) {
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403 PyErr_BadInternalCall();
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404 return NULL;
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405 }
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406 return tupleslice((PyTupleObject *)op, i, j);
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407 }
a347933a6d92 New function gettupleslice(v, i, j).
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408
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409 static PyObject *
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410 tupleconcat(register PyTupleObject *a, register PyObject *bb)
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411 {
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412 register Py_ssize_t size;
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413 register Py_ssize_t i;
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414 PyObject **src, **dest;
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415 PyTupleObject *np;
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416 if (!PyTuple_Check(bb)) {
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417 PyErr_Format(PyExc_TypeError,
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418 "can only concatenate tuple (not \"%.200s\") to tuple",
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419 Py_TYPE(bb)->tp_name);
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420 return NULL;
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421 }
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422 #define b ((PyTupleObject *)bb)
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423 size = Py_SIZE(a) + Py_SIZE(b);
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424 if (size < 0)
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425 return PyErr_NoMemory();
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426 np = (PyTupleObject *) PyTuple_New(size);
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427 if (np == NULL) {
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428 return NULL;
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429 }
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430 src = a->ob_item;
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431 dest = np->ob_item;
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432 for (i = 0; i < Py_SIZE(a); i++) {
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433 PyObject *v = src[i];
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434 Py_INCREF(v);
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435 dest[i] = v;
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436 }
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437 src = b->ob_item;
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438 dest = np->ob_item + Py_SIZE(a);
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439 for (i = 0; i < Py_SIZE(b); i++) {
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440 PyObject *v = src[i];
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441 Py_INCREF(v);
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442 dest[i] = v;
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443 }
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444 return (PyObject *)np;
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445 #undef b
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446 }
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447
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448 static PyObject *
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449 tuplerepeat(PyTupleObject *a, Py_ssize_t n)
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450 {
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451 Py_ssize_t i, j;
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452 Py_ssize_t size;
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453 PyTupleObject *np;
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454 PyObject **p, **items;
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455 if (n < 0)
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456 n = 0;
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457 if (Py_SIZE(a) == 0 || n == 1) {
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458 if (PyTuple_CheckExact(a)) {
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459 /* Since tuples are immutable, we can return a shared
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460 copy in this case */
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461 Py_INCREF(a);
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462 return (PyObject *)a;
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463 }
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464 if (Py_SIZE(a) == 0)
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465 return PyTuple_New(0);
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466 }
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467 size = Py_SIZE(a) * n;
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468 if (size/Py_SIZE(a) != n)
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469 return PyErr_NoMemory();
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470 np = (PyTupleObject *) PyTuple_New(size);
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471 if (np == NULL)
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472 return NULL;
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473 p = np->ob_item;
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474 items = a->ob_item;
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475 for (i = 0; i < n; i++) {
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476 for (j = 0; j < Py_SIZE(a); j++) {
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477 *p = items[j];
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478 Py_INCREF(*p);
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479 p++;
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480 }
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481 }
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482 return (PyObject *) np;
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483 }
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484
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485 static PyObject *
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486 tupleindex(PyTupleObject *self, PyObject *args)
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487 {
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488 Py_ssize_t i, start=0, stop=Py_SIZE(self);
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489 PyObject *v;
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490
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491 if (!PyArg_ParseTuple(args, "O|O&O&:index", &v,
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492 _PyEval_SliceIndex, &start,
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493 _PyEval_SliceIndex, &stop))
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494 return NULL;
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495 if (start < 0) {
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496 start += Py_SIZE(self);
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497 if (start < 0)
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498 start = 0;
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499 }
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500 if (stop < 0) {
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501 stop += Py_SIZE(self);
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502 if (stop < 0)
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503 stop = 0;
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504 }
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505 for (i = start; i < stop && i < Py_SIZE(self); i++) {
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506 int cmp = PyObject_RichCompareBool(self->ob_item[i], v, Py_EQ);
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507 if (cmp > 0)
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508 return PyLong_FromSsize_t(i);
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509 else if (cmp < 0)
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510 return NULL;
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511 }
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512 PyErr_SetString(PyExc_ValueError, "tuple.index(x): x not in tuple");
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513 return NULL;
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514 }
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515
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Raymond Hettinger <python@rcn.com>
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516 static PyObject *
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517 tuplecount(PyTupleObject *self, PyObject *v)
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diff changeset
518 {
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519 Py_ssize_t count = 0;
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520 Py_ssize_t i;
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diff changeset
521
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522 for (i = 0; i < Py_SIZE(self); i++) {
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523 int cmp = PyObject_RichCompareBool(self->ob_item[i], v, Py_EQ);
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524 if (cmp > 0)
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525 count++;
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526 else if (cmp < 0)
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527 return NULL;
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528 }
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529 return PyLong_FromSsize_t(count);
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530 }
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531
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532 static int
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533 tupletraverse(PyTupleObject *o, visitproc visit, void *arg)
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534 {
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535 Py_ssize_t i;
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536
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537 for (i = Py_SIZE(o); --i >= 0; )
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538 Py_VISIT(o->ob_item[i]);
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539 return 0;
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540 }
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541
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542 static PyObject *
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543 tuplerichcompare(PyObject *v, PyObject *w, int op)
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544 {
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545 PyTupleObject *vt, *wt;
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546 Py_ssize_t i;
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547 Py_ssize_t vlen, wlen;
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548
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549 if (!PyTuple_Check(v) || !PyTuple_Check(w)) {
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550 Py_INCREF(Py_NotImplemented);
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551 return Py_NotImplemented;
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552 }
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553
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554 vt = (PyTupleObject *)v;
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555 wt = (PyTupleObject *)w;
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556
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557 vlen = Py_SIZE(vt);
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558 wlen = Py_SIZE(wt);
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559
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560 /* Note: the corresponding code for lists has an "early out" test
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561 * here when op is EQ or NE and the lengths differ. That pays there,
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562 * but Tim was unable to find any real code where EQ/NE tuple
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563 * compares don't have the same length, so testing for it here would
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564 * have cost without benefit.
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565 */
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566
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567 /* Search for the first index where items are different.
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568 * Note that because tuples are immutable, it's safe to reuse
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569 * vlen and wlen across the comparison calls.
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570 */
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571 for (i = 0; i < vlen && i < wlen; i++) {
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572 int k = PyObject_RichCompareBool(vt->ob_item[i],
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573 wt->ob_item[i], Py_EQ);
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574 if (k < 0)
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575 return NULL;
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576 if (!k)
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577 break;
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578 }
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diff changeset
579
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580 if (i >= vlen || i >= wlen) {
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581 /* No more items to compare -- compare sizes */
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diff changeset
582 int cmp;
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583 PyObject *res;
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584 switch (op) {
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585 case Py_LT: cmp = vlen < wlen; break;
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586 case Py_LE: cmp = vlen <= wlen; break;
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587 case Py_EQ: cmp = vlen == wlen; break;
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588 case Py_NE: cmp = vlen != wlen; break;
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589 case Py_GT: cmp = vlen > wlen; break;
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590 case Py_GE: cmp = vlen >= wlen; break;
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591 default: return NULL; /* cannot happen */
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592 }
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593 if (cmp)
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594 res = Py_True;
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595 else
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596 res = Py_False;
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597 Py_INCREF(res);
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598 return res;
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599 }
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600
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601 /* We have an item that differs -- shortcuts for EQ/NE */
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602 if (op == Py_EQ) {
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603 Py_INCREF(Py_False);
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604 return Py_False;
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605 }
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606 if (op == Py_NE) {
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607 Py_INCREF(Py_True);
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608 return Py_True;
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609 }
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610
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611 /* Compare the final item again using the proper operator */
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612 return PyObject_RichCompare(vt->ob_item[i], wt->ob_item[i], op);
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613 }
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614
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615 static PyObject *
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616 tuple_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds);
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617
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618 static PyObject *
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619 tuple_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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620 {
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621 PyObject *arg = NULL;
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622 static char *kwlist[] = {"sequence", 0};
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623
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624 if (type != &PyTuple_Type)
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625 return tuple_subtype_new(type, args, kwds);
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626 if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O:tuple", kwlist, &arg))
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627 return NULL;
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628
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629 if (arg == NULL)
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630 return PyTuple_New(0);
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631 else
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632 return PySequence_Tuple(arg);
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633 }
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634
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635 static PyObject *
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636 tuple_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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637 {
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638 PyObject *tmp, *newobj, *item;
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639 Py_ssize_t i, n;
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640
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641 assert(PyType_IsSubtype(type, &PyTuple_Type));
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642 tmp = tuple_new(&PyTuple_Type, args, kwds);
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643 if (tmp == NULL)
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644 return NULL;
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645 assert(PyTuple_Check(tmp));
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646 newobj = type->tp_alloc(type, n = PyTuple_GET_SIZE(tmp));
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647 if (newobj == NULL)
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648 return NULL;
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649 for (i = 0; i < n; i++) {
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650 item = PyTuple_GET_ITEM(tmp, i);
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651 Py_INCREF(item);
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652 PyTuple_SET_ITEM(newobj, i, item);
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653 }
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654 Py_DECREF(tmp);
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655 return newobj;
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diff changeset
656 }
85765e61deb0 Make str and tuple types subclassable.
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diff changeset
657
23832
ed1ba37a46b7 Patch #568124: Add doc string macros.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
658 PyDoc_STRVAR(tuple_doc,
59224
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659 "tuple() -> empty tuple\n\
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660 tuple(iterable) -> tuple initialized from iterable's items\n\
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661 \n\
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662 If the argument is a tuple, the return value is the same object.");
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Tim Peters <tim.peters@gmail.com>
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diff changeset
663
5396
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664 static PySequenceMethods tuple_as_sequence = {
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665 (lenfunc)tuplelength, /* sq_length */
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666 (binaryfunc)tupleconcat, /* sq_concat */
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667 (ssizeargfunc)tuplerepeat, /* sq_repeat */
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668 (ssizeargfunc)tupleitem, /* sq_item */
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669 0, /* sq_slice */
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670 0, /* sq_ass_item */
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671 0, /* sq_ass_slice */
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672 (objobjproc)tuplecontains, /* sq_contains */
6
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673 };
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diff changeset
674
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Michael W. Hudson <mwh@python.net>
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675 static PyObject*
245224d1b8c9 This is my nearly two year old patch
Michael W. Hudson <mwh@python.net>
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diff changeset
676 tuplesubscript(PyTupleObject* self, PyObject* item)
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677 {
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678 if (PyIndex_Check(item)) {
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679 Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
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680 if (i == -1 && PyErr_Occurred())
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681 return NULL;
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682 if (i < 0)
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683 i += PyTuple_GET_SIZE(self);
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684 return tupleitem(self, i);
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685 }
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686 else if (PySlice_Check(item)) {
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687 Py_ssize_t start, stop, step, slicelength, cur, i;
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688 PyObject* result;
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689 PyObject* it;
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690 PyObject **src, **dest;
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Michael W. Hudson <mwh@python.net>
parents: 22979
diff changeset
691
66664
62b61abd02b8 Merge branches/pep-0384.
Martin v. Löwis <martin@v.loewis.de>
parents: 65603
diff changeset
692 if (PySlice_GetIndicesEx(item,
61466
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693 PyTuple_GET_SIZE(self),
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diff changeset
694 &start, &stop, &step, &slicelength) < 0) {
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695 return NULL;
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696 }
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Michael W. Hudson <mwh@python.net>
parents: 22979
diff changeset
697
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698 if (slicelength <= 0) {
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699 return PyTuple_New(0);
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700 }
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701 else if (start == 0 && step == 1 &&
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702 slicelength == PyTuple_GET_SIZE(self) &&
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diff changeset
703 PyTuple_CheckExact(self)) {
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diff changeset
704 Py_INCREF(self);
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diff changeset
705 return (PyObject *)self;
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diff changeset
706 }
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707 else {
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708 result = PyTuple_New(slicelength);
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diff changeset
709 if (!result) return NULL;
23778
245224d1b8c9 This is my nearly two year old patch
Michael W. Hudson <mwh@python.net>
parents: 22979
diff changeset
710
61466
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diff changeset
711 src = self->ob_item;
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diff changeset
712 dest = ((PyTupleObject *)result)->ob_item;
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diff changeset
713 for (cur = start, i = 0; i < slicelength;
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diff changeset
714 cur += step, i++) {
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715 it = src[cur];
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716 Py_INCREF(it);
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717 dest[i] = it;
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718 }
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diff changeset
719
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720 return result;
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721 }
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722 }
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723 else {
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724 PyErr_Format(PyExc_TypeError,
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725 "tuple indices must be integers, not %.200s",
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726 Py_TYPE(item)->tp_name);
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727 return NULL;
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728 }
23778
245224d1b8c9 This is my nearly two year old patch
Michael W. Hudson <mwh@python.net>
parents: 22979
diff changeset
729 }
245224d1b8c9 This is my nearly two year old patch
Michael W. Hudson <mwh@python.net>
parents: 22979
diff changeset
730
27521
17bfd5dbc0f1 Implement appropriate __getnewargs__ for all immutable subclassable builtin
Guido van Rossum <guido@python.org>
parents: 25740
diff changeset
731 static PyObject *
17bfd5dbc0f1 Implement appropriate __getnewargs__ for all immutable subclassable builtin
Guido van Rossum <guido@python.org>
parents: 25740
diff changeset
732 tuple_getnewargs(PyTupleObject *v)
17bfd5dbc0f1 Implement appropriate __getnewargs__ for all immutable subclassable builtin
Guido van Rossum <guido@python.org>
parents: 25740
diff changeset
733 {
61466
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734 return Py_BuildValue("(N)", tupleslice(v, 0, Py_SIZE(v)));
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735
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Guido van Rossum <guido@python.org>
parents: 25740
diff changeset
736 }
17bfd5dbc0f1 Implement appropriate __getnewargs__ for all immutable subclassable builtin
Guido van Rossum <guido@python.org>
parents: 25740
diff changeset
737
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parents: 46635
diff changeset
738 static PyObject *
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parents: 46635
diff changeset
739 tuple_sizeof(PyTupleObject *self)
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diff changeset
740 {
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741 Py_ssize_t res;
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diff changeset
742
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743 res = PyTuple_Type.tp_basicsize + Py_SIZE(self) * sizeof(PyObject *);
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744 return PyLong_FromSsize_t(res);
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745 }
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diff changeset
746
45206
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Raymond Hettinger <python@rcn.com>
parents: 45192
diff changeset
747 PyDoc_STRVAR(index_doc,
49493
bdf4da5d04ad merge from trunk
Benjamin Peterson <benjamin@python.org>
parents: 48850
diff changeset
748 "T.index(value, [start, [stop]]) -> integer -- return first index of value.\n"
bdf4da5d04ad merge from trunk
Benjamin Peterson <benjamin@python.org>
parents: 48850
diff changeset
749 "Raises ValueError if the value is not present."
bdf4da5d04ad merge from trunk
Benjamin Peterson <benjamin@python.org>
parents: 48850
diff changeset
750 );
45206
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Raymond Hettinger <python@rcn.com>
parents: 45192
diff changeset
751 PyDoc_STRVAR(count_doc,
063d022ac011 Issue 2025: Add index() and count() methods to tuple so that it will follow
Raymond Hettinger <python@rcn.com>
parents: 45192
diff changeset
752 "T.count(value) -> integer -- return number of occurrences of value");
48321
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parents: 46635
diff changeset
753 PyDoc_STRVAR(sizeof_doc,
f6726f32ef70 Merged revisions 64119,64147,64150,64165,64219-64221,64229-64230,64233,64235,64253,64278,64280,64301,64303,64320,64328,64338-64339 via svnmerge from
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 46635
diff changeset
754 "T.__sizeof__() -- size of T in memory, in bytes");
45206
063d022ac011 Issue 2025: Add index() and count() methods to tuple so that it will follow
Raymond Hettinger <python@rcn.com>
parents: 45192
diff changeset
755
27521
17bfd5dbc0f1 Implement appropriate __getnewargs__ for all immutable subclassable builtin
Guido van Rossum <guido@python.org>
parents: 25740
diff changeset
756 static PyMethodDef tuple_methods[] = {
61466
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diff changeset
757 {"__getnewargs__", (PyCFunction)tuple_getnewargs, METH_NOARGS},
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758 {"__sizeof__", (PyCFunction)tuple_sizeof, METH_NOARGS, sizeof_doc},
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759 {"index", (PyCFunction)tupleindex, METH_VARARGS, index_doc},
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760 {"count", (PyCFunction)tuplecount, METH_O, count_doc},
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diff changeset
761 {NULL, NULL} /* sentinel */
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parents: 25740
diff changeset
762 };
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Guido van Rossum <guido@python.org>
parents: 25740
diff changeset
763
23778
245224d1b8c9 This is my nearly two year old patch
Michael W. Hudson <mwh@python.net>
parents: 22979
diff changeset
764 static PyMappingMethods tuple_as_mapping = {
61466
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diff changeset
765 (lenfunc)tuplelength,
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diff changeset
766 (binaryfunc)tuplesubscript,
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diff changeset
767 0
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Michael W. Hudson <mwh@python.net>
parents: 22979
diff changeset
768 };
245224d1b8c9 This is my nearly two year old patch
Michael W. Hudson <mwh@python.net>
parents: 22979
diff changeset
769
24683
567704bfa595 Moved special case for tuples from iterobject.c to
Raymond Hettinger <python@rcn.com>
parents: 24280
diff changeset
770 static PyObject *tuple_iter(PyObject *seq);
567704bfa595 Moved special case for tuples from iterobject.c to
Raymond Hettinger <python@rcn.com>
parents: 24280
diff changeset
771
5396
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parents: 4733
diff changeset
772 PyTypeObject PyTuple_Type = {
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773 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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774 "tuple",
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775 sizeof(PyTupleObject) - sizeof(PyObject *),
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776 sizeof(PyObject *),
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777 (destructor)tupledealloc, /* tp_dealloc */
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778 0, /* tp_print */
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779 0, /* tp_getattr */
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780 0, /* tp_setattr */
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781 0, /* tp_reserved */
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782 (reprfunc)tuplerepr, /* tp_repr */
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783 0, /* tp_as_number */
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784 &tuple_as_sequence, /* tp_as_sequence */
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785 &tuple_as_mapping, /* tp_as_mapping */
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786 (hashfunc)tuplehash, /* tp_hash */
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787 0, /* tp_call */
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788 0, /* tp_str */
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789 PyObject_GenericGetAttr, /* tp_getattro */
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790 0, /* tp_setattro */
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791 0, /* tp_as_buffer */
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792 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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793 Py_TPFLAGS_BASETYPE | Py_TPFLAGS_TUPLE_SUBCLASS, /* tp_flags */
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794 tuple_doc, /* tp_doc */
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795 (traverseproc)tupletraverse, /* tp_traverse */
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796 0, /* tp_clear */
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797 tuplerichcompare, /* tp_richcompare */
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798 0, /* tp_weaklistoffset */
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799 tuple_iter, /* tp_iter */
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800 0, /* tp_iternext */
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801 tuple_methods, /* tp_methods */
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802 0, /* tp_members */
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803 0, /* tp_getset */
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804 0, /* tp_base */
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805 0, /* tp_dict */
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806 0, /* tp_descr_get */
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807 0, /* tp_descr_set */
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808 0, /* tp_dictoffset */
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809 0, /* tp_init */
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810 0, /* tp_alloc */
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811 tuple_new, /* tp_new */
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812 PyObject_GC_Del, /* tp_free */
6
fc6fcd7df4f7 Initial revision
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813 };
1369
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814
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Guido van Rossum <guido@python.org>
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diff changeset
815 /* The following function breaks the notion that tuples are immutable:
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816 it changes the size of a tuple. We get away with this only if there
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817 is only one module referencing the object. You can also think of it
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Neil Schemenauer <nascheme@enme.ucalgary.ca>
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818 as creating a new tuple object and destroying the old one, only more
c7d46eae95d8 Simplify _PyTuple_Resize by not using the tuple free list and dropping
Neil Schemenauer <nascheme@enme.ucalgary.ca>
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diff changeset
819 efficiently. In any case, don't use this if the tuple may already be
17976
d579a5d8b3fe Cruft cleanup: Removed the unused last_is_sticky argument from the internal
Tim Peters <tim.peters@gmail.com>
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diff changeset
820 known to some other part of the code. */
1369
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821
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822 int
36501
7fdc639bc5b4 Merge ssize_t branch.
Martin v. Löwis <martin@v.loewis.de>
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823 _PyTuple_Resize(PyObject **pv, Py_ssize_t newsize)
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824 {
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825 register PyTupleObject *v;
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826 register PyTupleObject *sv;
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827 Py_ssize_t i;
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828 Py_ssize_t oldsize;
1380
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
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829
61466
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830 v = (PyTupleObject *) *pv;
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831 if (v == NULL || Py_TYPE(v) != &PyTuple_Type ||
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832 (Py_SIZE(v) != 0 && Py_REFCNT(v) != 1)) {
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833 *pv = 0;
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834 Py_XDECREF(v);
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835 PyErr_BadInternalCall();
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836 return -1;
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837 }
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838 oldsize = Py_SIZE(v);
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839 if (oldsize == newsize)
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840 return 0;
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841
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842 if (oldsize == 0) {
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843 /* Empty tuples are often shared, so we should never
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844 resize them in-place even if we do own the only
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845 (current) reference */
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846 Py_DECREF(v);
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847 *pv = PyTuple_New(newsize);
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848 return *pv == NULL ? -1 : 0;
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849 }
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527d0ffdf099 _PyTuple_Resize: take into account the empty tuple. There can be only one.
Thomas Wouters <thomas@python.org>
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850
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851 /* XXX UNREF/NEWREF interface should be more symmetrical */
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852 _Py_DEC_REFTOTAL;
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853 if (_PyObject_GC_IS_TRACKED(v))
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854 _PyObject_GC_UNTRACK(v);
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855 _Py_ForgetReference((PyObject *) v);
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856 /* DECREF items deleted by shrinkage */
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857 for (i = newsize; i < oldsize; i++) {
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858 Py_XDECREF(v->ob_item[i]);
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859 v->ob_item[i] = NULL;
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860 }
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861 sv = PyObject_GC_Resize(PyTupleObject, v, newsize);
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862 if (sv == NULL) {
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863 *pv = NULL;
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864 PyObject_GC_Del(v);
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865 return -1;
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866 }
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867 _Py_NewReference((PyObject *) sv);
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868 /* Zero out items added by growing */
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869 if (newsize > oldsize)
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870 memset(&sv->ob_item[oldsize], 0,
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871 sizeof(*sv->ob_item) * (newsize - oldsize));
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872 *pv = (PyObject *) sv;
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873 _PyObject_GC_TRACK(sv);
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874 return 0;
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875 }
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876
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877 int
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878 PyTuple_ClearFreeList(void)
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879 {
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880 int freelist_size = 0;
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881 #if PyTuple_MAXSAVESIZE > 0
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882 int i;
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883 for (i = 1; i < PyTuple_MAXSAVESIZE; i++) {
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884 PyTupleObject *p, *q;
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885 p = free_list[i];
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886 freelist_size += numfree[i];
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887 free_list[i] = NULL;
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888 numfree[i] = 0;
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889 while (p) {
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890 q = p;
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891 p = (PyTupleObject *)(p->ob_item[0]);
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892 PyObject_GC_Del(q);
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893 }
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894 }
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895 #endif
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896 return freelist_size;
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897 }
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898
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899 void
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900 PyTuple_Fini(void)
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901 {
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902 #if PyTuple_MAXSAVESIZE > 0
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903 /* empty tuples are used all over the place and applications may
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904 * rely on the fact that an empty tuple is a singleton. */
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905 Py_XDECREF(free_list[0]);
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906 free_list[0] = NULL;
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907
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908 (void)PyTuple_ClearFreeList();
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909 #endif
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910 #ifdef SHOW_TRACK_COUNT
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911 show_track();
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912 #endif
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913 }
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914
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915 /*********************** Tuple Iterator **************************/
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916
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917 typedef struct {
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918 PyObject_HEAD
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919 long it_index;
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920 PyTupleObject *it_seq; /* Set to NULL when iterator is exhausted */
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921 } tupleiterobject;
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922
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923 static void
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924 tupleiter_dealloc(tupleiterobject *it)
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925 {
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926 _PyObject_GC_UNTRACK(it);
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927 Py_XDECREF(it->it_seq);
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928 PyObject_GC_Del(it);
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929 }
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930
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931 static int
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932 tupleiter_traverse(tupleiterobject *it, visitproc visit, void *arg)
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933 {
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934 Py_VISIT(it->it_seq);
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935 return 0;
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936 }
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937
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938 static PyObject *
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939 tupleiter_next(tupleiterobject *it)
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940 {
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941 PyTupleObject *seq;
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942 PyObject *item;
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943
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944 assert(it != NULL);
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945 seq = it->it_seq;
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946 if (seq == NULL)
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947 return NULL;
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948 assert(PyTuple_Check(seq));
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949
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950 if (it->it_index < PyTuple_GET_SIZE(seq)) {
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951 item = PyTuple_GET_ITEM(seq, it->it_index);
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952 ++it->it_index;
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953 Py_INCREF(item);
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954 return item;
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955 }
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956
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957 Py_DECREF(seq);
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958 it->it_seq = NULL;
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959 return NULL;
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960 }
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961
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962 static PyObject *
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963 tupleiter_len(tupleiterobject *it)
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964 {
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965 Py_ssize_t len = 0;
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966 if (it->it_seq)
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967 len = PyTuple_GET_SIZE(it->it_seq) - it->it_index;
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968 return PyLong_FromSsize_t(len);
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969 }
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970
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971 PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
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972
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973 static PyMethodDef tupleiter_methods[] = {
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974 {"__length_hint__", (PyCFunction)tupleiter_len, METH_NOARGS, length_hint_doc},
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975 {NULL, NULL} /* sentinel */
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976 };
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977
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978 PyTypeObject PyTupleIter_Type = {
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979 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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980 "tuple_iterator", /* tp_name */
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981 sizeof(tupleiterobject), /* tp_basicsize */
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982 0, /* tp_itemsize */
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983 /* methods */
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984 (destructor)tupleiter_dealloc, /* tp_dealloc */
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985 0, /* tp_print */
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986 0, /* tp_getattr */
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987 0, /* tp_setattr */
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988 0, /* tp_reserved */
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989 0, /* tp_repr */
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990 0, /* tp_as_number */
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991 0, /* tp_as_sequence */
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992 0, /* tp_as_mapping */
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993 0, /* tp_hash */
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994 0, /* tp_call */
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995 0, /* tp_str */
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996 PyObject_GenericGetAttr, /* tp_getattro */
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997 0, /* tp_setattro */
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998 0, /* tp_as_buffer */
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999 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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1000 0, /* tp_doc */
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1001 (traverseproc)tupleiter_traverse, /* tp_traverse */
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1002 0, /* tp_clear */
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1003 0, /* tp_richcompare */
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1004 0, /* tp_weaklistoffset */
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1005 PyObject_SelfIter, /* tp_iter */
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1006 (iternextfunc)tupleiter_next, /* tp_iternext */
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1007 tupleiter_methods, /* tp_methods */
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1008 0,
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1009 };
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1010
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1011 static PyObject *
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1012 tuple_iter(PyObject *seq)
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1013 {
61466
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1014 tupleiterobject *it;
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1015
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1016 if (!PyTuple_Check(seq)) {
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1017 PyErr_BadInternalCall();
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1018 return NULL;
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1019 }
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1020 it = PyObject_GC_New(tupleiterobject, &PyTupleIter_Type);
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1021 if (it == NULL)
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1022 return NULL;
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1023 it->it_index = 0;
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1024 Py_INCREF(seq);
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1025 it->it_seq = (PyTupleObject *)seq;
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1026 _PyObject_GC_TRACK(it);
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1027 return (PyObject *)it;
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1028 }