annotate Objects/tupleobject.c @ 87488:124e51c19e4f

Issue #19734: Also run pip version check in isolated mode
author Nick Coghlan <ncoghlan@gmail.com>
date Sun, 24 Nov 2013 16:49:20 +1000
parents 99141ab08e21
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 #include "accu.h"
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7 /* Speed optimization to avoid frequent malloc/free of small tuples */
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8 #ifndef PyTuple_MAXSAVESIZE
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9 #define PyTuple_MAXSAVESIZE 20 /* Largest tuple to save on free list */
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10 #endif
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11 #ifndef PyTuple_MAXFREELIST
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12 #define PyTuple_MAXFREELIST 2000 /* Maximum number of tuples of each size to save */
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13 #endif
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14
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15 #if PyTuple_MAXSAVESIZE > 0
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16 /* Entries 1 up to PyTuple_MAXSAVESIZE are free lists, entry 0 is the empty
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17 tuple () of which at most one instance will be allocated.
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18 */
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19 static PyTupleObject *free_list[PyTuple_MAXSAVESIZE];
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20 static int numfree[PyTuple_MAXSAVESIZE];
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21 #endif
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22 #ifdef COUNT_ALLOCS
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23 Py_ssize_t fast_tuple_allocs;
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24 Py_ssize_t tuple_zero_allocs;
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25 #endif
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26
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27 /* Debug statistic to count GC tracking of tuples.
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28 Please note that tuples are only untracked when considered by the GC, and
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29 many of them will be dead before. Therefore, a tracking rate close to 100%
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30 does not necessarily prove that the heuristic is inefficient.
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31 */
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32 #ifdef SHOW_TRACK_COUNT
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33 static Py_ssize_t count_untracked = 0;
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34 static Py_ssize_t count_tracked = 0;
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35
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36 static void
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37 show_track(void)
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38 {
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39 fprintf(stderr, "Tuples created: %" PY_FORMAT_SIZE_T "d\n",
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40 count_tracked + count_untracked);
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41 fprintf(stderr, "Tuples tracked by the GC: %" PY_FORMAT_SIZE_T
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42 "d\n", count_tracked);
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43 fprintf(stderr, "%.2f%% tuple tracking rate\n\n",
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44 (100.0*count_tracked/(count_untracked+count_tracked)));
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45 }
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46 #endif
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47
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48 /* Print summary info about the state of the optimized allocator */
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49 void
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50 _PyTuple_DebugMallocStats(FILE *out)
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51 {
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52 #if PyTuple_MAXSAVESIZE > 0
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53 int i;
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54 char buf[128];
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55 for (i = 1; i < PyTuple_MAXSAVESIZE; i++) {
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56 PyOS_snprintf(buf, sizeof(buf),
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57 "free %d-sized PyTupleObject", i);
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58 _PyDebugAllocatorStats(out,
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59 buf,
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60 numfree[i], _PyObject_VAR_SIZE(&PyTuple_Type, i));
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61 }
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62 #endif
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63 }
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64
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65 PyObject *
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66 PyTuple_New(Py_ssize_t size)
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67 {
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68 PyTupleObject *op;
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69 Py_ssize_t i;
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70 if (size < 0) {
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71 PyErr_BadInternalCall();
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72 return NULL;
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73 }
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74 #if PyTuple_MAXSAVESIZE > 0
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75 if (size == 0 && free_list[0]) {
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76 op = free_list[0];
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77 Py_INCREF(op);
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78 #ifdef COUNT_ALLOCS
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79 tuple_zero_allocs++;
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80 #endif
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81 return (PyObject *) op;
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82 }
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83 if (size < PyTuple_MAXSAVESIZE && (op = free_list[size]) != NULL) {
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84 free_list[size] = (PyTupleObject *) op->ob_item[0];
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85 numfree[size]--;
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86 #ifdef COUNT_ALLOCS
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87 fast_tuple_allocs++;
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88 #endif
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89 /* Inline PyObject_InitVar */
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90 #ifdef Py_TRACE_REFS
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91 Py_SIZE(op) = size;
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92 Py_TYPE(op) = &PyTuple_Type;
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93 #endif
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94 _Py_NewReference((PyObject *)op);
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95 }
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96 else
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97 #endif
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98 {
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99 /* Check for overflow */
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100 if (size > (PY_SSIZE_T_MAX - sizeof(PyTupleObject) -
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101 sizeof(PyObject *)) / sizeof(PyObject *)) {
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102 return PyErr_NoMemory();
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103 }
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104 op = PyObject_GC_NewVar(PyTupleObject, &PyTuple_Type, size);
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105 if (op == NULL)
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106 return NULL;
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107 }
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108 for (i=0; i < size; i++)
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109 op->ob_item[i] = NULL;
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110 #if PyTuple_MAXSAVESIZE > 0
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111 if (size == 0) {
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112 free_list[0] = op;
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113 ++numfree[0];
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114 Py_INCREF(op); /* extra INCREF so that this is never freed */
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115 }
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116 #endif
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117 #ifdef SHOW_TRACK_COUNT
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118 count_tracked++;
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119 #endif
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120 _PyObject_GC_TRACK(op);
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121 return (PyObject *) op;
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122 }
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123
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124 Py_ssize_t
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125 PyTuple_Size(PyObject *op)
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126 {
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127 if (!PyTuple_Check(op)) {
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128 PyErr_BadInternalCall();
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129 return -1;
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130 }
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131 else
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132 return Py_SIZE(op);
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133 }
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134
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135 PyObject *
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136 PyTuple_GetItem(PyObject *op, Py_ssize_t i)
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137 {
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138 if (!PyTuple_Check(op)) {
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139 PyErr_BadInternalCall();
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140 return NULL;
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141 }
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142 if (i < 0 || i >= Py_SIZE(op)) {
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143 PyErr_SetString(PyExc_IndexError, "tuple index out of range");
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144 return NULL;
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145 }
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146 return ((PyTupleObject *)op) -> ob_item[i];
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147 }
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148
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149 int
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150 PyTuple_SetItem(PyObject *op, Py_ssize_t i, PyObject *newitem)
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151 {
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152 PyObject *olditem;
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153 PyObject **p;
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154 if (!PyTuple_Check(op) || op->ob_refcnt != 1) {
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155 Py_XDECREF(newitem);
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156 PyErr_BadInternalCall();
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157 return -1;
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158 }
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159 if (i < 0 || i >= Py_SIZE(op)) {
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160 Py_XDECREF(newitem);
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161 PyErr_SetString(PyExc_IndexError,
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162 "tuple assignment index out of range");
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163 return -1;
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164 }
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165 p = ((PyTupleObject *)op) -> ob_item + i;
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166 olditem = *p;
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167 *p = newitem;
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168 Py_XDECREF(olditem);
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169 return 0;
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170 }
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171
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172 void
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173 _PyTuple_MaybeUntrack(PyObject *op)
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174 {
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175 PyTupleObject *t;
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176 Py_ssize_t i, n;
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177
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178 if (!PyTuple_CheckExact(op) || !_PyObject_GC_IS_TRACKED(op))
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179 return;
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180 t = (PyTupleObject *) op;
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181 n = Py_SIZE(t);
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182 for (i = 0; i < n; i++) {
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183 PyObject *elt = PyTuple_GET_ITEM(t, i);
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184 /* Tuple with NULL elements aren't
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185 fully constructed, don't untrack
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186 them yet. */
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187 if (!elt ||
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188 _PyObject_GC_MAY_BE_TRACKED(elt))
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189 return;
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190 }
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191 #ifdef SHOW_TRACK_COUNT
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192 count_tracked--;
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193 count_untracked++;
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194 #endif
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195 _PyObject_GC_UNTRACK(op);
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196 }
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197
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198 PyObject *
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199 PyTuple_Pack(Py_ssize_t n, ...)
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200 {
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201 Py_ssize_t i;
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202 PyObject *o;
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203 PyObject *result;
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204 PyObject **items;
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205 va_list vargs;
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206
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207 va_start(vargs, n);
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208 result = PyTuple_New(n);
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209 if (result == NULL) {
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210 va_end(vargs);
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211 return NULL;
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212 }
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213 items = ((PyTupleObject *)result)->ob_item;
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214 for (i = 0; i < n; i++) {
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215 o = va_arg(vargs, PyObject *);
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216 Py_INCREF(o);
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217 items[i] = o;
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218 }
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219 va_end(vargs);
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220 return result;
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221 }
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222
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223
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224 /* Methods */
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225
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226 static void
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227 tupledealloc(PyTupleObject *op)
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228 {
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229 Py_ssize_t i;
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230 Py_ssize_t len = Py_SIZE(op);
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231 PyObject_GC_UnTrack(op);
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232 Py_TRASHCAN_SAFE_BEGIN(op)
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233 if (len > 0) {
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234 i = len;
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235 while (--i >= 0)
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236 Py_XDECREF(op->ob_item[i]);
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237 #if PyTuple_MAXSAVESIZE > 0
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238 if (len < PyTuple_MAXSAVESIZE &&
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239 numfree[len] < PyTuple_MAXFREELIST &&
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240 Py_TYPE(op) == &PyTuple_Type)
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241 {
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242 op->ob_item[0] = (PyObject *) free_list[len];
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243 numfree[len]++;
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244 free_list[len] = op;
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245 goto done; /* return */
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246 }
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247 #endif
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248 }
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249 Py_TYPE(op)->tp_free((PyObject *)op);
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c94247b5c355 Christian Tismer's "trashcan" patch:
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parents: 11673
diff changeset
250 done:
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251 Py_TRASHCAN_SAFE_END(op)
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252 }
fc6fcd7df4f7 Initial revision
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parents:
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253
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d1447950fa04 Quickly renamed the last directory.
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parents: 4733
diff changeset
254 static PyObject *
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parents: 13265
diff changeset
255 tuplerepr(PyTupleObject *v)
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parents:
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256 {
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257 Py_ssize_t i, n;
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258 _PyUnicodeWriter writer;
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diff changeset
259
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260 n = Py_SIZE(v);
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261 if (n == 0)
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262 return PyUnicode_FromString("()");
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parents: 17979
diff changeset
263
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264 /* While not mutable, it is still possible to end up with a cycle in a
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265 tuple through an object that stores itself within a tuple (and thus
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266 infinitely asks for the repr of itself). This should only be
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267 possible within a type. */
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268 i = Py_ReprEnter((PyObject *)v);
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269 if (i != 0) {
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270 return i > 0 ? PyUnicode_FromString("(...)") : NULL;
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271 }
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parents: 43100
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272
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273 _PyUnicodeWriter_Init(&writer);
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274 writer.overallocate = 1;
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275 if (Py_SIZE(v) > 1) {
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276 /* "(" + "1" + ", 2" * (len - 1) + ")" */
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277 writer.min_length = 1 + 1 + (2 + 1) * (Py_SIZE(v) - 1) + 1;
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278 }
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279 else {
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280 /* "(1,)" */
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281 writer.min_length = 4;
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282 }
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283
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284 if (_PyUnicodeWriter_WriteChar(&writer, '(') < 0)
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parents: 66664
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285 goto error;
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Tim Peters <tim.peters@gmail.com>
parents: 17979
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286
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287 /* Do repr() on each element. */
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288 for (i = 0; i < n; ++i) {
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289 PyObject *s;
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290
99141ab08e21 Issue #19513: repr(tuple) now uses _PyUnicodeWriter for better performances
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291 if (i > 0) {
99141ab08e21 Issue #19513: repr(tuple) now uses _PyUnicodeWriter for better performances
Victor Stinner <victor.stinner@gmail.com>
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292 if (_PyUnicodeWriter_WriteASCIIString(&writer, ", ", 2) < 0)
99141ab08e21 Issue #19513: repr(tuple) now uses _PyUnicodeWriter for better performances
Victor Stinner <victor.stinner@gmail.com>
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293 goto error;
99141ab08e21 Issue #19513: repr(tuple) now uses _PyUnicodeWriter for better performances
Victor Stinner <victor.stinner@gmail.com>
parents: 85157
diff changeset
294 }
99141ab08e21 Issue #19513: repr(tuple) now uses _PyUnicodeWriter for better performances
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parents: 85157
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295
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296 if (Py_EnterRecursiveCall(" while getting the repr of a tuple"))
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297 goto error;
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298 s = PyObject_Repr(v->ob_item[i]);
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299 Py_LeaveRecursiveCall();
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300 if (s == NULL)
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301 goto error;
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302
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303 if (_PyUnicodeWriter_WriteStr(&writer, s) < 0) {
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304 Py_DECREF(s);
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305 goto error;
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306 }
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307 Py_DECREF(s);
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308 }
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309
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310 writer.overallocate = 0;
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311 if (n > 1) {
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parents: 85157
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312 if (_PyUnicodeWriter_WriteChar(&writer, ')') < 0)
99141ab08e21 Issue #19513: repr(tuple) now uses _PyUnicodeWriter for better performances
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parents: 85157
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313 goto error;
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Victor Stinner <victor.stinner@gmail.com>
parents: 85157
diff changeset
314 }
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Victor Stinner <victor.stinner@gmail.com>
parents: 85157
diff changeset
315 else {
99141ab08e21 Issue #19513: repr(tuple) now uses _PyUnicodeWriter for better performances
Victor Stinner <victor.stinner@gmail.com>
parents: 85157
diff changeset
316 if (_PyUnicodeWriter_WriteASCIIString(&writer, ",)", 2) < 0)
99141ab08e21 Issue #19513: repr(tuple) now uses _PyUnicodeWriter for better performances
Victor Stinner <victor.stinner@gmail.com>
parents: 85157
diff changeset
317 goto error;
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Victor Stinner <victor.stinner@gmail.com>
parents: 85157
diff changeset
318 }
18129
9d533ae574d2 SF bug 433228: repr(list) woes when len(list) big.
Tim Peters <tim.peters@gmail.com>
parents: 17979
diff changeset
319
72755
f9f782f2369e Issue #12911: Fix memory consumption when calculating the repr() of huge tuples or lists.
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diff changeset
320 Py_ReprLeave((PyObject *)v);
87264
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Victor Stinner <victor.stinner@gmail.com>
parents: 85157
diff changeset
321 return _PyUnicodeWriter_Finish(&writer);
18129
9d533ae574d2 SF bug 433228: repr(list) woes when len(list) big.
Tim Peters <tim.peters@gmail.com>
parents: 17979
diff changeset
322
72755
f9f782f2369e Issue #12911: Fix memory consumption when calculating the repr() of huge tuples or lists.
Antoine Pitrou <solipsis@pitrou.net>
parents: 66664
diff changeset
323 error:
87264
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diff changeset
324 _PyUnicodeWriter_Dealloc(&writer);
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325 Py_ReprLeave((PyObject *)v);
72755
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Antoine Pitrou <solipsis@pitrou.net>
parents: 66664
diff changeset
326 return NULL;
6
fc6fcd7df4f7 Initial revision
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parents:
diff changeset
327 }
fc6fcd7df4f7 Initial revision
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parents:
diff changeset
328
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329 /* The addend 82520, was selected from the range(0, 1000000) for
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330 generating the greatest number of prime multipliers for tuples
32242
0bdb49a5a8fa Replaced arbitrary addend in tuple_hash with one that is known to generate
Raymond Hettinger <python@rcn.com>
parents: 32171
diff changeset
331 upto length eight:
0bdb49a5a8fa Replaced arbitrary addend in tuple_hash with one that is known to generate
Raymond Hettinger <python@rcn.com>
parents: 32171
diff changeset
332
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333 1082527, 1165049, 1082531, 1165057, 1247581, 1330103, 1082533,
32242
0bdb49a5a8fa Replaced arbitrary addend in tuple_hash with one that is known to generate
Raymond Hettinger <python@rcn.com>
parents: 32171
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334 1330111, 1412633, 1165069, 1247599, 1495177, 1577699
81310
17038de56fd4 Add a comment about *not* caching the hash value. Issue #9685 suggested to memorize the hash value, but the feature request was rejected because no speed ups were found.
Christian Heimes <christian@cheimes.de>
parents: 80823
diff changeset
335
17038de56fd4 Add a comment about *not* caching the hash value. Issue #9685 suggested to memorize the hash value, but the feature request was rejected because no speed ups were found.
Christian Heimes <christian@cheimes.de>
parents: 80823
diff changeset
336 Tests have shown that it's not worth to cache the hash value, see
17038de56fd4 Add a comment about *not* caching the hash value. Issue #9685 suggested to memorize the hash value, but the feature request was rejected because no speed ups were found.
Christian Heimes <christian@cheimes.de>
parents: 80823
diff changeset
337 issue #9685.
32242
0bdb49a5a8fa Replaced arbitrary addend in tuple_hash with one that is known to generate
Raymond Hettinger <python@rcn.com>
parents: 32171
diff changeset
338 */
0bdb49a5a8fa Replaced arbitrary addend in tuple_hash with one that is known to generate
Raymond Hettinger <python@rcn.com>
parents: 32171
diff changeset
339
65494
e8969fb822fc make hashes always the size of pointers; introduce Py_hash_t #9778
Benjamin Peterson <benjamin@python.org>
parents: 61466
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340 static Py_hash_t
13459
0f95c93f200b ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13265
diff changeset
341 tuplehash(PyTupleObject *v)
1257
1cabc2b6c970 * Changed all copyright messages to include 1993.
Guido van Rossum <guido@python.org>
parents: 795
diff changeset
342 {
85157
e7f6cef7a4cc Issue #18722: Remove uses of the "register" keyword in C code.
Antoine Pitrou <solipsis@pitrou.net>
parents: 84329
diff changeset
343 Py_uhash_t x; /* Unsigned for defined overflow behavior. */
e7f6cef7a4cc Issue #18722: Remove uses of the "register" keyword in C code.
Antoine Pitrou <solipsis@pitrou.net>
parents: 84329
diff changeset
344 Py_hash_t y;
e7f6cef7a4cc Issue #18722: Remove uses of the "register" keyword in C code.
Antoine Pitrou <solipsis@pitrou.net>
parents: 84329
diff changeset
345 Py_ssize_t len = Py_SIZE(v);
e7f6cef7a4cc Issue #18722: Remove uses of the "register" keyword in C code.
Antoine Pitrou <solipsis@pitrou.net>
parents: 84329
diff changeset
346 PyObject **p;
80820
5c4e440852db Fix the internals of our hash functions to used unsigned values during hash
Gregory P. Smith <greg@krypto.org>
parents: 78937
diff changeset
347 Py_uhash_t mult = _PyHASH_MULTIPLIER;
5c4e440852db Fix the internals of our hash functions to used unsigned values during hash
Gregory P. Smith <greg@krypto.org>
parents: 78937
diff changeset
348 x = 0x345678UL;
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349 p = v->ob_item;
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350 while (--len >= 0) {
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351 y = PyObject_Hash(*p++);
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352 if (y == -1)
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diff changeset
353 return -1;
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354 x = (x ^ y) * mult;
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355 /* the cast might truncate len; that doesn't change hash stability */
80821
8b4fff41dee5 Fix the internals of our hash functions to used unsigned values during hash
Gregory P. Smith <greg@krypto.org>
parents: 79529 80820
diff changeset
356 mult += (Py_hash_t)(82520UL + len + len);
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357 }
80820
5c4e440852db Fix the internals of our hash functions to used unsigned values during hash
Gregory P. Smith <greg@krypto.org>
parents: 78937
diff changeset
358 x += 97531UL;
72464
698fa089ce70 Issue #1621: Fix undefined behaviour in bytes.__hash__, str.__hash__, tuple.__hash__, frozenset.__hash__ and set indexing operations.
Mark Dickinson <mdickinson@enthought.com>
parents: 71810
diff changeset
359 if (x == (Py_uhash_t)-1)
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360 x = -2;
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361 return x;
1257
1cabc2b6c970 * Changed all copyright messages to include 1993.
Guido van Rossum <guido@python.org>
parents: 795
diff changeset
362 }
1cabc2b6c970 * Changed all copyright messages to include 1993.
Guido van Rossum <guido@python.org>
parents: 795
diff changeset
363
36501
7fdc639bc5b4 Merge ssize_t branch.
Martin v. Löwis <martin@v.loewis.de>
parents: 36484
diff changeset
364 static Py_ssize_t
13459
0f95c93f200b ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13265
diff changeset
365 tuplelength(PyTupleObject *a)
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
366 {
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367 return Py_SIZE(a);
6
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Guido van Rossum <guido@python.org>
parents:
diff changeset
368 }
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
369
12516
e6e914d5b207 add list_contains and tuplecontains: efficient implementations of tp_contains
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 12439
diff changeset
370 static int
13459
0f95c93f200b ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13265
diff changeset
371 tuplecontains(PyTupleObject *a, PyObject *el)
12516
e6e914d5b207 add list_contains and tuplecontains: efficient implementations of tp_contains
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 12439
diff changeset
372 {
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diff changeset
373 Py_ssize_t i;
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374 int cmp;
12516
e6e914d5b207 add list_contains and tuplecontains: efficient implementations of tp_contains
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 12439
diff changeset
375
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376 for (i = 0, cmp = 0 ; cmp == 0 && i < Py_SIZE(a); ++i)
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377 cmp = PyObject_RichCompareBool(el, PyTuple_GET_ITEM(a, i),
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378 Py_EQ);
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379 return cmp;
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380 }
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381
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382 static PyObject *
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383 tupleitem(PyTupleObject *a, Py_ssize_t i)
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384 {
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385 if (i < 0 || i >= Py_SIZE(a)) {
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386 PyErr_SetString(PyExc_IndexError, "tuple index out of range");
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387 return NULL;
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388 }
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389 Py_INCREF(a->ob_item[i]);
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390 return a->ob_item[i];
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391 }
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392
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393 static PyObject *
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394 tupleslice(PyTupleObject *a, Py_ssize_t ilow,
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395 Py_ssize_t ihigh)
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396 {
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397 PyTupleObject *np;
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398 PyObject **src, **dest;
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399 Py_ssize_t i;
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400 Py_ssize_t len;
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401 if (ilow < 0)
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402 ilow = 0;
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403 if (ihigh > Py_SIZE(a))
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404 ihigh = Py_SIZE(a);
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405 if (ihigh < ilow)
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406 ihigh = ilow;
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407 if (ilow == 0 && ihigh == Py_SIZE(a) && PyTuple_CheckExact(a)) {
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408 Py_INCREF(a);
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409 return (PyObject *)a;
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410 }
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411 len = ihigh - ilow;
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412 np = (PyTupleObject *)PyTuple_New(len);
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413 if (np == NULL)
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414 return NULL;
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415 src = a->ob_item + ilow;
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416 dest = np->ob_item;
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417 for (i = 0; i < len; i++) {
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418 PyObject *v = src[i];
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419 Py_INCREF(v);
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420 dest[i] = v;
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421 }
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422 return (PyObject *)np;
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423 }
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424
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425 PyObject *
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426 PyTuple_GetSlice(PyObject *op, Py_ssize_t i, Py_ssize_t j)
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427 {
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428 if (op == NULL || !PyTuple_Check(op)) {
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429 PyErr_BadInternalCall();
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430 return NULL;
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431 }
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432 return tupleslice((PyTupleObject *)op, i, j);
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433 }
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434
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435 static PyObject *
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436 tupleconcat(PyTupleObject *a, PyObject *bb)
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437 {
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438 Py_ssize_t size;
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439 Py_ssize_t i;
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440 PyObject **src, **dest;
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441 PyTupleObject *np;
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442 if (!PyTuple_Check(bb)) {
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443 PyErr_Format(PyExc_TypeError,
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444 "can only concatenate tuple (not \"%.200s\") to tuple",
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445 Py_TYPE(bb)->tp_name);
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446 return NULL;
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447 }
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448 #define b ((PyTupleObject *)bb)
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449 size = Py_SIZE(a) + Py_SIZE(b);
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450 if (size < 0)
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451 return PyErr_NoMemory();
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452 np = (PyTupleObject *) PyTuple_New(size);
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453 if (np == NULL) {
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454 return NULL;
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455 }
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456 src = a->ob_item;
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457 dest = np->ob_item;
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458 for (i = 0; i < Py_SIZE(a); i++) {
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459 PyObject *v = src[i];
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460 Py_INCREF(v);
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461 dest[i] = v;
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462 }
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463 src = b->ob_item;
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464 dest = np->ob_item + Py_SIZE(a);
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465 for (i = 0; i < Py_SIZE(b); i++) {
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466 PyObject *v = src[i];
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467 Py_INCREF(v);
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468 dest[i] = v;
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469 }
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470 return (PyObject *)np;
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471 #undef b
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472 }
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473
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474 static PyObject *
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475 tuplerepeat(PyTupleObject *a, Py_ssize_t n)
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476 {
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477 Py_ssize_t i, j;
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478 Py_ssize_t size;
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479 PyTupleObject *np;
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480 PyObject **p, **items;
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481 if (n < 0)
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482 n = 0;
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483 if (Py_SIZE(a) == 0 || n == 1) {
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484 if (PyTuple_CheckExact(a)) {
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485 /* Since tuples are immutable, we can return a shared
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486 copy in this case */
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487 Py_INCREF(a);
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488 return (PyObject *)a;
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489 }
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490 if (Py_SIZE(a) == 0)
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491 return PyTuple_New(0);
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492 }
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493 if (n > PY_SSIZE_T_MAX / Py_SIZE(a))
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494 return PyErr_NoMemory();
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495 size = Py_SIZE(a) * n;
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496 np = (PyTupleObject *) PyTuple_New(size);
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497 if (np == NULL)
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498 return NULL;
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499 p = np->ob_item;
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500 items = a->ob_item;
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501 for (i = 0; i < n; i++) {
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502 for (j = 0; j < Py_SIZE(a); j++) {
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503 *p = items[j];
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504 Py_INCREF(*p);
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505 p++;
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506 }
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507 }
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508 return (PyObject *) np;
258
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509 }
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510
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511 static PyObject *
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512 tupleindex(PyTupleObject *self, PyObject *args)
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513 {
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514 Py_ssize_t i, start=0, stop=Py_SIZE(self);
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515 PyObject *v;
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516
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517 if (!PyArg_ParseTuple(args, "O|O&O&:index", &v,
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518 _PyEval_SliceIndex, &start,
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519 _PyEval_SliceIndex, &stop))
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520 return NULL;
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521 if (start < 0) {
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522 start += Py_SIZE(self);
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523 if (start < 0)
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524 start = 0;
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525 }
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526 if (stop < 0) {
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527 stop += Py_SIZE(self);
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528 if (stop < 0)
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529 stop = 0;
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530 }
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531 for (i = start; i < stop && i < Py_SIZE(self); i++) {
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532 int cmp = PyObject_RichCompareBool(self->ob_item[i], v, Py_EQ);
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533 if (cmp > 0)
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534 return PyLong_FromSsize_t(i);
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535 else if (cmp < 0)
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536 return NULL;
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537 }
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538 PyErr_SetString(PyExc_ValueError, "tuple.index(x): x not in tuple");
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539 return NULL;
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540 }
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541
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542 static PyObject *
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543 tuplecount(PyTupleObject *self, PyObject *v)
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544 {
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545 Py_ssize_t count = 0;
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546 Py_ssize_t i;
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547
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548 for (i = 0; i < Py_SIZE(self); i++) {
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549 int cmp = PyObject_RichCompareBool(self->ob_item[i], v, Py_EQ);
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550 if (cmp > 0)
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551 count++;
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552 else if (cmp < 0)
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553 return NULL;
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554 }
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555 return PyLong_FromSsize_t(count);
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556 }
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557
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558 static int
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559 tupletraverse(PyTupleObject *o, visitproc visit, void *arg)
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560 {
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561 Py_ssize_t i;
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562
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563 for (i = Py_SIZE(o); --i >= 0; )
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564 Py_VISIT(o->ob_item[i]);
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565 return 0;
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566 }
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diff changeset
567
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568 static PyObject *
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569 tuplerichcompare(PyObject *v, PyObject *w, int op)
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570 {
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571 PyTupleObject *vt, *wt;
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572 Py_ssize_t i;
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573 Py_ssize_t vlen, wlen;
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574
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diff changeset
575 if (!PyTuple_Check(v) || !PyTuple_Check(w))
d0b0fcbb40db Replace Py_NotImplemented returns with the macro form Py_RETURN_NOTIMPLEMENTED.
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576 Py_RETURN_NOTIMPLEMENTED;
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577
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578 vt = (PyTupleObject *)v;
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579 wt = (PyTupleObject *)w;
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580
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581 vlen = Py_SIZE(vt);
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582 wlen = Py_SIZE(wt);
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583
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584 /* Note: the corresponding code for lists has an "early out" test
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585 * here when op is EQ or NE and the lengths differ. That pays there,
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586 * but Tim was unable to find any real code where EQ/NE tuple
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587 * compares don't have the same length, so testing for it here would
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588 * have cost without benefit.
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589 */
17841
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590
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591 /* Search for the first index where items are different.
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592 * Note that because tuples are immutable, it's safe to reuse
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593 * vlen and wlen across the comparison calls.
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594 */
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595 for (i = 0; i < vlen && i < wlen; i++) {
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596 int k = PyObject_RichCompareBool(vt->ob_item[i],
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597 wt->ob_item[i], Py_EQ);
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598 if (k < 0)
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599 return NULL;
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600 if (!k)
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601 break;
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602 }
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603
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604 if (i >= vlen || i >= wlen) {
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605 /* No more items to compare -- compare sizes */
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606 int cmp;
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607 PyObject *res;
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608 switch (op) {
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609 case Py_LT: cmp = vlen < wlen; break;
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610 case Py_LE: cmp = vlen <= wlen; break;
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611 case Py_EQ: cmp = vlen == wlen; break;
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612 case Py_NE: cmp = vlen != wlen; break;
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613 case Py_GT: cmp = vlen > wlen; break;
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614 case Py_GE: cmp = vlen >= wlen; break;
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615 default: return NULL; /* cannot happen */
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616 }
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617 if (cmp)
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618 res = Py_True;
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619 else
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620 res = Py_False;
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621 Py_INCREF(res);
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622 return res;
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623 }
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624
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625 /* We have an item that differs -- shortcuts for EQ/NE */
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626 if (op == Py_EQ) {
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627 Py_INCREF(Py_False);
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628 return Py_False;
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629 }
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630 if (op == Py_NE) {
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631 Py_INCREF(Py_True);
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632 return Py_True;
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633 }
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634
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635 /* Compare the final item again using the proper operator */
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636 return PyObject_RichCompare(vt->ob_item[i], wt->ob_item[i], op);
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637 }
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diff changeset
638
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639 static PyObject *
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diff changeset
640 tuple_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds);
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641
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642 static PyObject *
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643 tuple_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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644 {
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645 PyObject *arg = NULL;
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646 static char *kwlist[] = {"sequence", 0};
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647
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648 if (type != &PyTuple_Type)
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649 return tuple_subtype_new(type, args, kwds);
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650 if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O:tuple", kwlist, &arg))
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651 return NULL;
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652
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653 if (arg == NULL)
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654 return PyTuple_New(0);
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655 else
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656 return PySequence_Tuple(arg);
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657 }
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658
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659 static PyObject *
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660 tuple_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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661 {
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662 PyObject *tmp, *newobj, *item;
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663 Py_ssize_t i, n;
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664
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665 assert(PyType_IsSubtype(type, &PyTuple_Type));
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666 tmp = tuple_new(&PyTuple_Type, args, kwds);
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667 if (tmp == NULL)
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668 return NULL;
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669 assert(PyTuple_Check(tmp));
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670 newobj = type->tp_alloc(type, n = PyTuple_GET_SIZE(tmp));
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671 if (newobj == NULL)
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672 return NULL;
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673 for (i = 0; i < n; i++) {
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674 item = PyTuple_GET_ITEM(tmp, i);
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675 Py_INCREF(item);
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676 PyTuple_SET_ITEM(newobj, i, item);
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677 }
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678 Py_DECREF(tmp);
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679 return newobj;
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680 }
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diff changeset
681
23832
ed1ba37a46b7 Patch #568124: Add doc string macros.
Martin v. Löwis <martin@v.loewis.de>
parents: 23778
diff changeset
682 PyDoc_STRVAR(tuple_doc,
59224
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683 "tuple() -> empty tuple\n\
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diff changeset
684 tuple(iterable) -> tuple initialized from iterable's items\n\
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diff changeset
685 \n\
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diff changeset
686 If the argument is a tuple, the return value is the same object.");
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diff changeset
687
5396
d1447950fa04 Quickly renamed the last directory.
Guido van Rossum <guido@python.org>
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diff changeset
688 static PySequenceMethods tuple_as_sequence = {
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689 (lenfunc)tuplelength, /* sq_length */
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690 (binaryfunc)tupleconcat, /* sq_concat */
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691 (ssizeargfunc)tuplerepeat, /* sq_repeat */
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diff changeset
692 (ssizeargfunc)tupleitem, /* sq_item */
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693 0, /* sq_slice */
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diff changeset
694 0, /* sq_ass_item */
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695 0, /* sq_ass_slice */
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diff changeset
696 (objobjproc)tuplecontains, /* sq_contains */
6
fc6fcd7df4f7 Initial revision
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diff changeset
697 };
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parents:
diff changeset
698
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Michael W. Hudson <mwh@python.net>
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diff changeset
699 static PyObject*
245224d1b8c9 This is my nearly two year old patch
Michael W. Hudson <mwh@python.net>
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diff changeset
700 tuplesubscript(PyTupleObject* self, PyObject* item)
245224d1b8c9 This is my nearly two year old patch
Michael W. Hudson <mwh@python.net>
parents: 22979
diff changeset
701 {
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702 if (PyIndex_Check(item)) {
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diff changeset
703 Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
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diff changeset
704 if (i == -1 && PyErr_Occurred())
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diff changeset
705 return NULL;
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diff changeset
706 if (i < 0)
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diff changeset
707 i += PyTuple_GET_SIZE(self);
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diff changeset
708 return tupleitem(self, i);
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709 }
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diff changeset
710 else if (PySlice_Check(item)) {
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711 Py_ssize_t start, stop, step, slicelength, cur, i;
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diff changeset
712 PyObject* result;
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diff changeset
713 PyObject* it;
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diff changeset
714 PyObject **src, **dest;
23778
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Michael W. Hudson <mwh@python.net>
parents: 22979
diff changeset
715
66664
62b61abd02b8 Merge branches/pep-0384.
Martin v. Löwis <martin@v.loewis.de>
parents: 65603
diff changeset
716 if (PySlice_GetIndicesEx(item,
61466
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717 PyTuple_GET_SIZE(self),
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diff changeset
718 &start, &stop, &step, &slicelength) < 0) {
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diff changeset
719 return NULL;
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720 }
23778
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Michael W. Hudson <mwh@python.net>
parents: 22979
diff changeset
721
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722 if (slicelength <= 0) {
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723 return PyTuple_New(0);
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724 }
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725 else if (start == 0 && step == 1 &&
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726 slicelength == PyTuple_GET_SIZE(self) &&
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diff changeset
727 PyTuple_CheckExact(self)) {
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diff changeset
728 Py_INCREF(self);
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diff changeset
729 return (PyObject *)self;
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diff changeset
730 }
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731 else {
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732 result = PyTuple_New(slicelength);
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diff changeset
733 if (!result) return NULL;
23778
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Michael W. Hudson <mwh@python.net>
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diff changeset
734
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735 src = self->ob_item;
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736 dest = ((PyTupleObject *)result)->ob_item;
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diff changeset
737 for (cur = start, i = 0; i < slicelength;
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diff changeset
738 cur += step, i++) {
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diff changeset
739 it = src[cur];
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740 Py_INCREF(it);
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741 dest[i] = it;
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diff changeset
742 }
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diff changeset
743
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744 return result;
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745 }
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746 }
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747 else {
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748 PyErr_Format(PyExc_TypeError,
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diff changeset
749 "tuple indices must be integers, not %.200s",
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750 Py_TYPE(item)->tp_name);
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751 return NULL;
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752 }
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Michael W. Hudson <mwh@python.net>
parents: 22979
diff changeset
753 }
245224d1b8c9 This is my nearly two year old patch
Michael W. Hudson <mwh@python.net>
parents: 22979
diff changeset
754
27521
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Guido van Rossum <guido@python.org>
parents: 25740
diff changeset
755 static PyObject *
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parents: 25740
diff changeset
756 tuple_getnewargs(PyTupleObject *v)
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parents: 25740
diff changeset
757 {
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758 return Py_BuildValue("(N)", tupleslice(v, 0, Py_SIZE(v)));
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759
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Guido van Rossum <guido@python.org>
parents: 25740
diff changeset
760 }
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diff changeset
761
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762 static PyObject *
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763 tuple_sizeof(PyTupleObject *self)
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764 {
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765 Py_ssize_t res;
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766
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767 res = PyTuple_Type.tp_basicsize + Py_SIZE(self) * sizeof(PyObject *);
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768 return PyLong_FromSsize_t(res);
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diff changeset
769 }
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diff changeset
770
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
771 PyDoc_STRVAR(index_doc,
49493
bdf4da5d04ad merge from trunk
Benjamin Peterson <benjamin@python.org>
parents: 48850
diff changeset
772 "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
773 "Raises ValueError if the value is not present."
bdf4da5d04ad merge from trunk
Benjamin Peterson <benjamin@python.org>
parents: 48850
diff changeset
774 );
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
775 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
776 "T.count(value) -> integer -- return number of occurrences of value");
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diff changeset
777 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
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parents: 46635
diff changeset
778 "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
779
27521
17bfd5dbc0f1 Implement appropriate __getnewargs__ for all immutable subclassable builtin
Guido van Rossum <guido@python.org>
parents: 25740
diff changeset
780 static PyMethodDef tuple_methods[] = {
61466
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diff changeset
781 {"__getnewargs__", (PyCFunction)tuple_getnewargs, METH_NOARGS},
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diff changeset
782 {"__sizeof__", (PyCFunction)tuple_sizeof, METH_NOARGS, sizeof_doc},
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diff changeset
783 {"index", (PyCFunction)tupleindex, METH_VARARGS, index_doc},
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diff changeset
784 {"count", (PyCFunction)tuplecount, METH_O, count_doc},
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diff changeset
785 {NULL, NULL} /* sentinel */
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diff changeset
786 };
17bfd5dbc0f1 Implement appropriate __getnewargs__ for all immutable subclassable builtin
Guido van Rossum <guido@python.org>
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diff changeset
787
23778
245224d1b8c9 This is my nearly two year old patch
Michael W. Hudson <mwh@python.net>
parents: 22979
diff changeset
788 static PyMappingMethods tuple_as_mapping = {
61466
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diff changeset
789 (lenfunc)tuplelength,
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790 (binaryfunc)tuplesubscript,
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791 0
23778
245224d1b8c9 This is my nearly two year old patch
Michael W. Hudson <mwh@python.net>
parents: 22979
diff changeset
792 };
245224d1b8c9 This is my nearly two year old patch
Michael W. Hudson <mwh@python.net>
parents: 22979
diff changeset
793
24683
567704bfa595 Moved special case for tuples from iterobject.c to
Raymond Hettinger <python@rcn.com>
parents: 24280
diff changeset
794 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
795
5396
d1447950fa04 Quickly renamed the last directory.
Guido van Rossum <guido@python.org>
parents: 4733
diff changeset
796 PyTypeObject PyTuple_Type = {
61466
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797 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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diff changeset
798 "tuple",
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diff changeset
799 sizeof(PyTupleObject) - sizeof(PyObject *),
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diff changeset
800 sizeof(PyObject *),
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diff changeset
801 (destructor)tupledealloc, /* tp_dealloc */
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diff changeset
802 0, /* tp_print */
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diff changeset
803 0, /* tp_getattr */
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diff changeset
804 0, /* tp_setattr */
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diff changeset
805 0, /* tp_reserved */
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diff changeset
806 (reprfunc)tuplerepr, /* tp_repr */
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diff changeset
807 0, /* tp_as_number */
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diff changeset
808 &tuple_as_sequence, /* tp_as_sequence */
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diff changeset
809 &tuple_as_mapping, /* tp_as_mapping */
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diff changeset
810 (hashfunc)tuplehash, /* tp_hash */
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diff changeset
811 0, /* tp_call */
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diff changeset
812 0, /* tp_str */
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diff changeset
813 PyObject_GenericGetAttr, /* tp_getattro */
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diff changeset
814 0, /* tp_setattro */
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diff changeset
815 0, /* tp_as_buffer */
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816 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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817 Py_TPFLAGS_BASETYPE | Py_TPFLAGS_TUPLE_SUBCLASS, /* tp_flags */
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diff changeset
818 tuple_doc, /* tp_doc */
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819 (traverseproc)tupletraverse, /* tp_traverse */
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820 0, /* tp_clear */
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821 tuplerichcompare, /* tp_richcompare */
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822 0, /* tp_weaklistoffset */
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diff changeset
823 tuple_iter, /* tp_iter */
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824 0, /* tp_iternext */
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diff changeset
825 tuple_methods, /* tp_methods */
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diff changeset
826 0, /* tp_members */
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diff changeset
827 0, /* tp_getset */
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diff changeset
828 0, /* tp_base */
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diff changeset
829 0, /* tp_dict */
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830 0, /* tp_descr_get */
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831 0, /* tp_descr_set */
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832 0, /* tp_dictoffset */
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diff changeset
833 0, /* tp_init */
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diff changeset
834 0, /* tp_alloc */
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diff changeset
835 tuple_new, /* tp_new */
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diff changeset
836 PyObject_GC_Del, /* tp_free */
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
837 };
1369
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
838
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
839 /* The following function breaks the notion that tuples are immutable:
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
840 it changes the size of a tuple. We get away with this only if there
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
841 is only one module referencing the object. You can also think of it
15037
c7d46eae95d8 Simplify _PyTuple_Resize by not using the tuple free list and dropping
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 14584
diff changeset
842 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>
parents: 14584
diff changeset
843 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>
parents: 17975
diff changeset
844 known to some other part of the code. */
1369
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
845
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
846 int
36501
7fdc639bc5b4 Merge ssize_t branch.
Martin v. Löwis <martin@v.loewis.de>
parents: 36484
diff changeset
847 _PyTuple_Resize(PyObject **pv, Py_ssize_t newsize)
1369
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
848 {
85157
e7f6cef7a4cc Issue #18722: Remove uses of the "register" keyword in C code.
Antoine Pitrou <solipsis@pitrou.net>
parents: 84329
diff changeset
849 PyTupleObject *v;
e7f6cef7a4cc Issue #18722: Remove uses of the "register" keyword in C code.
Antoine Pitrou <solipsis@pitrou.net>
parents: 84329
diff changeset
850 PyTupleObject *sv;
61466
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851 Py_ssize_t i;
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852 Py_ssize_t oldsize;
1380
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
853
61466
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854 v = (PyTupleObject *) *pv;
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855 if (v == NULL || Py_TYPE(v) != &PyTuple_Type ||
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856 (Py_SIZE(v) != 0 && Py_REFCNT(v) != 1)) {
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857 *pv = 0;
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858 Py_XDECREF(v);
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859 PyErr_BadInternalCall();
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860 return -1;
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861 }
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862 oldsize = Py_SIZE(v);
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863 if (oldsize == newsize)
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864 return 0;
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Neil Schemenauer <nascheme@enme.ucalgary.ca>
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865
61466
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866 if (oldsize == 0) {
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867 /* Empty tuples are often shared, so we should never
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868 resize them in-place even if we do own the only
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869 (current) reference */
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870 Py_DECREF(v);
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871 *pv = PyTuple_New(newsize);
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872 return *pv == NULL ? -1 : 0;
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873 }
17975
527d0ffdf099 _PyTuple_Resize: take into account the empty tuple. There can be only one.
Thomas Wouters <thomas@python.org>
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diff changeset
874
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875 /* XXX UNREF/NEWREF interface should be more symmetrical */
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876 _Py_DEC_REFTOTAL;
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877 if (_PyObject_GC_IS_TRACKED(v))
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878 _PyObject_GC_UNTRACK(v);
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879 _Py_ForgetReference((PyObject *) v);
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880 /* DECREF items deleted by shrinkage */
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881 for (i = newsize; i < oldsize; i++) {
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882 Py_XDECREF(v->ob_item[i]);
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883 v->ob_item[i] = NULL;
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884 }
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885 sv = PyObject_GC_Resize(PyTupleObject, v, newsize);
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886 if (sv == NULL) {
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887 *pv = NULL;
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888 PyObject_GC_Del(v);
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889 return -1;
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890 }
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891 _Py_NewReference((PyObject *) sv);
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892 /* Zero out items added by growing */
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893 if (newsize > oldsize)
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894 memset(&sv->ob_item[oldsize], 0,
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895 sizeof(*sv->ob_item) * (newsize - oldsize));
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896 *pv = (PyObject *) sv;
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897 _PyObject_GC_TRACK(sv);
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898 return 0;
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89e1e5d9ccbf * compile.[ch]: support for lambda()
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899 }
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900
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901 int
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902 PyTuple_ClearFreeList(void)
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903 {
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904 int freelist_size = 0;
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905 #if PyTuple_MAXSAVESIZE > 0
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906 int i;
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907 for (i = 1; i < PyTuple_MAXSAVESIZE; i++) {
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908 PyTupleObject *p, *q;
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909 p = free_list[i];
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910 freelist_size += numfree[i];
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911 free_list[i] = NULL;
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912 numfree[i] = 0;
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913 while (p) {
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914 q = p;
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915 p = (PyTupleObject *)(p->ob_item[0]);
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916 PyObject_GC_Del(q);
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917 }
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918 }
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919 #endif
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920 return freelist_size;
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921 }
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922
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923 void
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924 PyTuple_Fini(void)
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925 {
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926 #if PyTuple_MAXSAVESIZE > 0
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927 /* empty tuples are used all over the place and applications may
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928 * rely on the fact that an empty tuple is a singleton. */
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929 Py_XDECREF(free_list[0]);
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930 free_list[0] = NULL;
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931
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932 (void)PyTuple_ClearFreeList();
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933 #endif
52291
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934 #ifdef SHOW_TRACK_COUNT
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935 show_track();
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936 #endif
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937 }
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938
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939 /*********************** Tuple Iterator **************************/
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940
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941 typedef struct {
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942 PyObject_HEAD
84027
52075f60719e Issuse #17932: Fix an integer overflow issue on Windows 64-bit in tuple
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943 Py_ssize_t it_index;
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944 PyTupleObject *it_seq; /* Set to NULL when iterator is exhausted */
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945 } tupleiterobject;
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946
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947 static void
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948 tupleiter_dealloc(tupleiterobject *it)
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949 {
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950 _PyObject_GC_UNTRACK(it);
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951 Py_XDECREF(it->it_seq);
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952 PyObject_GC_Del(it);
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953 }
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954
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955 static int
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956 tupleiter_traverse(tupleiterobject *it, visitproc visit, void *arg)
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957 {
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958 Py_VISIT(it->it_seq);
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959 return 0;
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960 }
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961
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962 static PyObject *
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963 tupleiter_next(tupleiterobject *it)
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964 {
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965 PyTupleObject *seq;
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966 PyObject *item;
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967
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968 assert(it != NULL);
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969 seq = it->it_seq;
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970 if (seq == NULL)
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971 return NULL;
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972 assert(PyTuple_Check(seq));
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973
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974 if (it->it_index < PyTuple_GET_SIZE(seq)) {
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975 item = PyTuple_GET_ITEM(seq, it->it_index);
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976 ++it->it_index;
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977 Py_INCREF(item);
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978 return item;
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979 }
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980
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981 Py_DECREF(seq);
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982 it->it_seq = NULL;
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983 return NULL;
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984 }
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985
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986 static PyObject *
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987 tupleiter_len(tupleiterobject *it)
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988 {
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989 Py_ssize_t len = 0;
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990 if (it->it_seq)
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991 len = PyTuple_GET_SIZE(it->it_seq) - it->it_index;
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992 return PyLong_FromSsize_t(len);
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993 }
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994
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995 PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
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996
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997 static PyObject *
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998 tupleiter_reduce(tupleiterobject *it)
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999 {
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1000 if (it->it_seq)
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1001 return Py_BuildValue("N(O)n", _PyObject_GetBuiltin("iter"),
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1002 it->it_seq, it->it_index);
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1003 else
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fb907ee4fdfa Rename _PyIter_GetBuiltin to _PyObject_GetBuiltin, and do not include it in the stable ABI.
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1004 return Py_BuildValue("N(())", _PyObject_GetBuiltin("iter"));
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1005 }
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1006
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1007 static PyObject *
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1008 tupleiter_setstate(tupleiterobject *it, PyObject *state)
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1009 {
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1010 Py_ssize_t index = PyLong_AsSsize_t(state);
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1011 if (index == -1 && PyErr_Occurred())
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1012 return NULL;
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1013 if (it->it_seq != NULL) {
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1014 if (index < 0)
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1015 index = 0;
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1016 else if (it->it_seq != NULL && index > PyTuple_GET_SIZE(it->it_seq))
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1017 index = PyTuple_GET_SIZE(it->it_seq);
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1018 it->it_index = index;
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1019 }
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1020 Py_RETURN_NONE;
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1021 }
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1022
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1023 PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
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1024 PyDoc_STRVAR(setstate_doc, "Set state information for unpickling.");
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1025
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1026 static PyMethodDef tupleiter_methods[] = {
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1027 {"__length_hint__", (PyCFunction)tupleiter_len, METH_NOARGS, length_hint_doc},
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1028 {"__reduce__", (PyCFunction)tupleiter_reduce, METH_NOARGS, reduce_doc},
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1029 {"__setstate__", (PyCFunction)tupleiter_setstate, METH_O, setstate_doc},
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1030 {NULL, NULL} /* sentinel */
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1031 };
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1032
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1033 PyTypeObject PyTupleIter_Type = {
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1034 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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1035 "tuple_iterator", /* tp_name */
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1036 sizeof(tupleiterobject), /* tp_basicsize */
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1037 0, /* tp_itemsize */
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1038 /* methods */
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1039 (destructor)tupleiter_dealloc, /* tp_dealloc */
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1040 0, /* tp_print */
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1041 0, /* tp_getattr */
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1042 0, /* tp_setattr */
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1043 0, /* tp_reserved */
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1044 0, /* tp_repr */
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1045 0, /* tp_as_number */
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1046 0, /* tp_as_sequence */
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1047 0, /* tp_as_mapping */
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1048 0, /* tp_hash */
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1049 0, /* tp_call */
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1050 0, /* tp_str */
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1051 PyObject_GenericGetAttr, /* tp_getattro */
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1052 0, /* tp_setattro */
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1053 0, /* tp_as_buffer */
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1054 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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1055 0, /* tp_doc */
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1056 (traverseproc)tupleiter_traverse, /* tp_traverse */
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1057 0, /* tp_clear */
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1058 0, /* tp_richcompare */
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1059 0, /* tp_weaklistoffset */
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1060 PyObject_SelfIter, /* tp_iter */
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1061 (iternextfunc)tupleiter_next, /* tp_iternext */
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1062 tupleiter_methods, /* tp_methods */
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1063 0,
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1064 };
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1065
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1066 static PyObject *
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1067 tuple_iter(PyObject *seq)
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1068 {
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1069 tupleiterobject *it;
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1070
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1071 if (!PyTuple_Check(seq)) {
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1072 PyErr_BadInternalCall();
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1073 return NULL;
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1074 }
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1075 it = PyObject_GC_New(tupleiterobject, &PyTupleIter_Type);
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1076 if (it == NULL)
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1077 return NULL;
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1078 it->it_index = 0;
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1079 Py_INCREF(seq);
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1080 it->it_seq = (PyTupleObject *)seq;
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1081 _PyObject_GC_TRACK(it);
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1082 return (PyObject *)it;
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1083 }