Mercurial > cpython-lru_cache-weakref

annotate Objects/tupleobject.c @ 5817:48b94de85bf3 legacy-trunk

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author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents d1447950fa04
children 80d24364b932
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* Tuple object implementation */
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33
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34 #include "Python.h"
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35
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36 #ifndef MAXSAVESIZE
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37 #define MAXSAVESIZE 20
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38 #endif
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39
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40 #if MAXSAVESIZE > 0
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41 /* Entries 1 upto MAXSAVESIZE are free lists, entry 0 is the empty
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42 tuple () of which at most one instance will be allocated.
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43 */
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44 static PyTupleObject *free_tuples[MAXSAVESIZE];
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45 #endif
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46 #ifdef COUNT_ALLOCS
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47 int fast_tuple_allocs;
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48 int tuple_zero_allocs;
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49 #endif
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50
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51 PyObject *
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52 PyTuple_New(size)
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53 register int size;
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54 {
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55 register int i;
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56 register PyTupleObject *op;
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57 if (size < 0) {
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58 PyErr_BadInternalCall();
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59 return NULL;
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60 }
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61 #if MAXSAVESIZE > 0
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62 if (size == 0 && free_tuples[0]) {
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63 op = free_tuples[0];
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64 Py_INCREF(op);
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65 #ifdef COUNT_ALLOCS
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66 tuple_zero_allocs++;
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67 #endif
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68 return (PyObject *) op;
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69 }
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70 if (0 < size && size < MAXSAVESIZE &&
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71 (op = free_tuples[size]) != NULL)
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72 {
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73 free_tuples[size] = (PyTupleObject *) op->ob_item[0];
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74 #ifdef COUNT_ALLOCS
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75 fast_tuple_allocs++;
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76 #endif
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77 } else
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78 #endif
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79 {
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80 op = (PyTupleObject *) malloc(
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81 sizeof(PyTupleObject) + size * sizeof(PyObject *));
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82 if (op == NULL)
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83 return PyErr_NoMemory();
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84 }
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85 op->ob_type = &PyTuple_Type;
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86 op->ob_size = size;
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87 for (i = 0; i < size; i++)
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88 op->ob_item[i] = NULL;
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89 _Py_NewReference(op);
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90 #if MAXSAVESIZE > 0
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91 if (size == 0) {
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92 free_tuples[0] = op;
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93 Py_INCREF(op); /* extra INCREF so that this is never freed */
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94 }
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95 #endif
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96 return (PyObject *) op;
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97 }
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98
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99 int
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100 PyTuple_Size(op)
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101 register PyObject *op;
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102 {
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103 if (!PyTuple_Check(op)) {
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104 PyErr_BadInternalCall();
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105 return -1;
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106 }
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107 else
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108 return ((PyTupleObject *)op)->ob_size;
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109 }
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110
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111 PyObject *
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112 PyTuple_GetItem(op, i)
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113 register PyObject *op;
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114 register int i;
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115 {
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116 if (!PyTuple_Check(op)) {
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117 PyErr_BadInternalCall();
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118 return NULL;
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119 }
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120 if (i < 0 || i >= ((PyTupleObject *)op) -> ob_size) {
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121 PyErr_SetString(PyExc_IndexError, "tuple index out of range");
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122 return NULL;
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123 }
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124 return ((PyTupleObject *)op) -> ob_item[i];
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125 }
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126
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127 int
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128 PyTuple_SetItem(op, i, newitem)
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129 register PyObject *op;
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130 register int i;
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131 PyObject *newitem;
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132 {
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133 register PyObject *olditem;
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134 register PyObject **p;
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135 if (!PyTuple_Check(op)) {
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136 Py_XDECREF(newitem);
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137 PyErr_BadInternalCall();
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138 return -1;
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139 }
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140 if (i < 0 || i >= ((PyTupleObject *)op) -> ob_size) {
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141 Py_XDECREF(newitem);
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142 PyErr_SetString(PyExc_IndexError,
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143 "tuple assignment index out of range");
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144 return -1;
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145 }
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146 p = ((PyTupleObject *)op) -> ob_item + i;
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147 olditem = *p;
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148 *p = newitem;
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149 Py_XDECREF(olditem);
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150 return 0;
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151 }
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152
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153 /* Methods */
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154
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155 static void
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156 tupledealloc(op)
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157 register PyTupleObject *op;
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158 {
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159 register int i;
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160 for (i = 0; i < op->ob_size; i++)
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161 Py_XDECREF(op->ob_item[i]);
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162 #if MAXSAVESIZE > 0
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163 if (0 < op->ob_size && op->ob_size < MAXSAVESIZE) {
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164 op->ob_item[0] = (PyObject *) free_tuples[op->ob_size];
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165 free_tuples[op->ob_size] = op;
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166 } else
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167 #endif
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168 free((ANY *)op);
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169 }
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170
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171 static int
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172 tupleprint(op, fp, flags)
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173 PyTupleObject *op;
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174 FILE *fp;
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175 int flags;
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176 {
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177 int i;
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178 fprintf(fp, "(");
288
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179 for (i = 0; i < op->ob_size; i++) {
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180 if (i > 0)
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181 fprintf(fp, ", ");
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182 if (PyObject_Print(op->ob_item[i], fp, 0) != 0)
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183 return -1;
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184 }
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185 if (op->ob_size == 1)
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186 fprintf(fp, ",");
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187 fprintf(fp, ")");
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188 return 0;
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189 }
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190
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191 static PyObject *
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192 tuplerepr(v)
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193 PyTupleObject *v;
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194 {
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195 PyObject *s, *comma;
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196 int i;
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197 s = PyString_FromString("(");
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198 comma = PyString_FromString(", ");
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199 for (i = 0; i < v->ob_size && s != NULL; i++) {
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200 if (i > 0)
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201 PyString_Concat(&s, comma);
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202 PyString_ConcatAndDel(&s, PyObject_Repr(v->ob_item[i]));
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203 }
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204 Py_DECREF(comma);
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205 if (v->ob_size == 1)
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206 PyString_ConcatAndDel(&s, PyString_FromString(","));
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207 PyString_ConcatAndDel(&s, PyString_FromString(")"));
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208 return s;
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209 }
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210
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211 static int
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212 tuplecompare(v, w)
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213 register PyTupleObject *v, *w;
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214 {
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215 register int len =
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216 (v->ob_size < w->ob_size) ? v->ob_size : w->ob_size;
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217 register int i;
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218 for (i = 0; i < len; i++) {
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219 int cmp = PyObject_Compare(v->ob_item[i], w->ob_item[i]);
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220 if (cmp != 0)
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221 return cmp;
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222 }
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223 return v->ob_size - w->ob_size;
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224 }
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225
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226 static long
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227 tuplehash(v)
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228 PyTupleObject *v;
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229 {
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230 register long x, y;
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231 register int len = v->ob_size;
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232 register PyObject **p;
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233 x = 0x345678L;
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234 p = v->ob_item;
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235 while (--len >= 0) {
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236 y = PyObject_Hash(*p++);
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237 if (y == -1)
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238 return -1;
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239 x = (1000003*x) ^ y;
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240 }
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241 x ^= v->ob_size;
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242 if (x == -1)
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243 x = -2;
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244 return x;
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245 }
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246
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247 static int
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248 tuplelength(a)
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249 PyTupleObject *a;
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250 {
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251 return a->ob_size;
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252 }
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253
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254 static PyObject *
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255 tupleitem(a, i)
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256 register PyTupleObject *a;
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257 register int i;
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258 {
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259 if (i < 0 || i >= a->ob_size) {
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260 PyErr_SetString(PyExc_IndexError, "tuple index out of range");
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261 return NULL;
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262 }
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263 Py_INCREF(a->ob_item[i]);
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264 return a->ob_item[i];
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265 }
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266
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267 static PyObject *
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268 tupleslice(a, ilow, ihigh)
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269 register PyTupleObject *a;
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270 register int ilow, ihigh;
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271 {
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272 register PyTupleObject *np;
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273 register int i;
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274 if (ilow < 0)
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275 ilow = 0;
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276 if (ihigh > a->ob_size)
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277 ihigh = a->ob_size;
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278 if (ihigh < ilow)
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279 ihigh = ilow;
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280 if (ilow == 0 && ihigh == a->ob_size) {
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281 /* XXX can only do this if tuples are immutable! */
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282 Py_INCREF(a);
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283 return (PyObject *)a;
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284 }
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285 np = (PyTupleObject *)PyTuple_New(ihigh - ilow);
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286 if (np == NULL)
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287 return NULL;
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288 for (i = ilow; i < ihigh; i++) {
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289 PyObject *v = a->ob_item[i];
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290 Py_INCREF(v);
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291 np->ob_item[i - ilow] = v;
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292 }
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293 return (PyObject *)np;
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294 }
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295
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296 PyObject *
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297 PyTuple_GetSlice(op, i, j)
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298 PyObject *op;
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299 int i, j;
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300 {
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301 if (op == NULL || !PyTuple_Check(op)) {
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302 PyErr_BadInternalCall();
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303 return NULL;
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304 }
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305 return tupleslice((PyTupleObject *)op, i, j);
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306 }
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307
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308 static PyObject *
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309 tupleconcat(a, bb)
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310 register PyTupleObject *a;
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311 register PyObject *bb;
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312 {
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313 register int size;
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314 register int i;
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315 PyTupleObject *np;
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316 if (!PyTuple_Check(bb)) {
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317 PyErr_BadArgument();
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318 return NULL;
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319 }
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320 #define b ((PyTupleObject *)bb)
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321 size = a->ob_size + b->ob_size;
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322 np = (PyTupleObject *) PyTuple_New(size);
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323 if (np == NULL) {
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324 return NULL;
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325 }
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326 for (i = 0; i < a->ob_size; i++) {
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327 PyObject *v = a->ob_item[i];
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328 Py_INCREF(v);
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329 np->ob_item[i] = v;
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330 }
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331 for (i = 0; i < b->ob_size; i++) {
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332 PyObject *v = b->ob_item[i];
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333 Py_INCREF(v);
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334 np->ob_item[i + a->ob_size] = v;
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335 }
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336 return (PyObject *)np;
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337 #undef b
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338 }
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339
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340 static PyObject *
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341 tuplerepeat(a, n)
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342 PyTupleObject *a;
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343 int n;
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344 {
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345 int i, j;
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346 int size;
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347 PyTupleObject *np;
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348 PyObject **p;
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349 if (n < 0)
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350 n = 0;
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351 if (a->ob_size*n == a->ob_size) {
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352 /* Since tuples are immutable, we can return a shared
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353 copy in this case */
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354 Py_INCREF(a);
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355 return (PyObject *)a;
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356 }
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357 size = a->ob_size * n;
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358 np = (PyTupleObject *) PyTuple_New(size);
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359 if (np == NULL)
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360 return NULL;
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361 p = np->ob_item;
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362 for (i = 0; i < n; i++) {
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363 for (j = 0; j < a->ob_size; j++) {
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364 *p = a->ob_item[j];
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365 Py_INCREF(*p);
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366 p++;
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367 }
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368 }
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369 return (PyObject *) np;
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370 }
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371
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372 static PySequenceMethods tuple_as_sequence = {
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373 (inquiry)tuplelength, /*sq_length*/
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374 (binaryfunc)tupleconcat, /*sq_concat*/
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375 (intargfunc)tuplerepeat, /*sq_repeat*/
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376 (intargfunc)tupleitem, /*sq_item*/
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377 (intintargfunc)tupleslice, /*sq_slice*/
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378 0, /*sq_ass_item*/
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379 0, /*sq_ass_slice*/
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380 };
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381
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382 PyTypeObject PyTuple_Type = {
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383 PyObject_HEAD_INIT(&PyType_Type)
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384 0,
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385 "tuple",
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386 sizeof(PyTupleObject) - sizeof(PyObject *),
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387 sizeof(PyObject *),
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388 (destructor)tupledealloc, /*tp_dealloc*/
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389 (printfunc)tupleprint, /*tp_print*/
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390 0, /*tp_getattr*/
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391 0, /*tp_setattr*/
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392 (cmpfunc)tuplecompare, /*tp_compare*/
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393 (reprfunc)tuplerepr, /*tp_repr*/
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394 0, /*tp_as_number*/
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395 &tuple_as_sequence, /*tp_as_sequence*/
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396 0, /*tp_as_mapping*/
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397 (hashfunc)tuplehash, /*tp_hash*/
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398 };
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399
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400 /* The following function breaks the notion that tuples are immutable:
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401 it changes the size of a tuple. We get away with this only if there
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402 is only one module referencing the object. You can also think of it
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403 as creating a new tuple object and destroying the old one, only
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404 more efficiently. In any case, don't use this if the tuple may
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405 already be known to some other part of the code...
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406 If last_is_sticky is set, the tuple will grow or shrink at the
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407 front, otherwise it will grow or shrink at the end. */
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408
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409 int
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410 _PyTuple_Resize(pv, newsize, last_is_sticky)
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411 PyObject **pv;
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412 int newsize;
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413 int last_is_sticky;
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414 {
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415 register PyTupleObject *v;
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416 register PyTupleObject *sv;
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417 int i;
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418 int sizediff;
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419
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420 v = (PyTupleObject *) *pv;
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421 if (v == NULL || !PyTuple_Check(v) || v->ob_refcnt != 1) {
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422 *pv = 0;
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423 Py_DECREF(v);
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424 PyErr_BadInternalCall();
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425 return -1;
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426 }
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427 sizediff = newsize - v->ob_size;
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428 if (sizediff == 0)
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429 return 0;
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430 /* XXX UNREF/NEWREF interface should be more symmetrical */
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431 #ifdef Py_REF_DEBUG
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432 --_Py_RefTotal;
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433 #endif
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434 _Py_ForgetReference(v);
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435 if (last_is_sticky && sizediff < 0) {
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436 /* shrinking:
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437 move entries to the front and zero moved entries */
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438 for (i = 0; i < newsize; i++) {
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439 Py_XDECREF(v->ob_item[i]);
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440 v->ob_item[i] = v->ob_item[i - sizediff];
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441 v->ob_item[i - sizediff] = NULL;
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442 }
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443 }
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444 for (i = newsize; i < v->ob_size; i++) {
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445 Py_XDECREF(v->ob_item[i]);
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446 v->ob_item[i] = NULL;
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447 }
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448 sv = (PyTupleObject *)
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449 realloc((char *)v,
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450 sizeof(PyTupleObject) + newsize * sizeof(PyObject *));
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451 *pv = (PyObject *) sv;
1380
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
452 if (sv == NULL) {
5396
d1447950fa04 Quickly renamed the last directory.
Guido van Rossum <guido@python.org>
parents: 4733
diff changeset
453 PyMem_DEL(v);
d1447950fa04 Quickly renamed the last directory.
Guido van Rossum <guido@python.org>
parents: 4733
diff changeset
454 PyErr_NoMemory();
1369
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
455 return -1;
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
456 }
5396
d1447950fa04 Quickly renamed the last directory.
Guido van Rossum <guido@python.org>
parents: 4733
diff changeset
457 _Py_NewReference(sv);
1380
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
458 for (i = sv->ob_size; i < newsize; i++)
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
459 sv->ob_item[i] = NULL;
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
460 if (last_is_sticky && sizediff > 0) {
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
461 /* growing: move entries to the end and zero moved entries */
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
462 for (i = newsize - 1; i >= sizediff; i--) {
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
463 sv->ob_item[i] = sv->ob_item[i - sizediff];
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
464 sv->ob_item[i - sizediff] = NULL;
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
465 }
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
466 }
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
467 sv->ob_size = newsize;
1369
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
468 return 0;
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
469 }