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annotate Objects/tupleobject.c @ 6719:faebc1940432 legacy-trunk

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author Guido van Rossum <guido@python.org>
date Tue, 02 Dec 1997 20:38:11 +0000
parents f159044530b1
children 92267838feb9
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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 }
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78 else
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79 #endif
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80 {
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81 op = (PyTupleObject *) malloc(
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82 sizeof(PyTupleObject) + size * sizeof(PyObject *));
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83 if (op == NULL)
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84 return PyErr_NoMemory();
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85 }
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86 op->ob_type = &PyTuple_Type;
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87 op->ob_size = size;
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88 for (i = 0; i < size; i++)
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89 op->ob_item[i] = NULL;
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90 _Py_NewReference(op);
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91 #if MAXSAVESIZE > 0
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92 if (size == 0) {
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93 free_tuples[0] = op;
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94 Py_INCREF(op); /* extra INCREF so that this is never freed */
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95 }
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96 #endif
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97 return (PyObject *) op;
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98 }
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99
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100 int
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101 PyTuple_Size(op)
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102 register PyObject *op;
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103 {
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104 if (!PyTuple_Check(op)) {
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105 PyErr_BadInternalCall();
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106 return -1;
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107 }
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108 else
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109 return ((PyTupleObject *)op)->ob_size;
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110 }
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111
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112 PyObject *
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113 PyTuple_GetItem(op, i)
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114 register PyObject *op;
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115 register int i;
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116 {
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117 if (!PyTuple_Check(op)) {
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118 PyErr_BadInternalCall();
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119 return NULL;
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120 }
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121 if (i < 0 || i >= ((PyTupleObject *)op) -> ob_size) {
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122 PyErr_SetString(PyExc_IndexError, "tuple index out of range");
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123 return NULL;
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124 }
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125 return ((PyTupleObject *)op) -> ob_item[i];
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126 }
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127
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128 int
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129 PyTuple_SetItem(op, i, newitem)
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130 register PyObject *op;
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131 register int i;
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132 PyObject *newitem;
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133 {
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134 register PyObject *olditem;
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135 register PyObject **p;
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136 if (!PyTuple_Check(op) || op->ob_refcnt != 1) {
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137 Py_XDECREF(newitem);
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138 PyErr_BadInternalCall();
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139 return -1;
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140 }
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141 if (i < 0 || i >= ((PyTupleObject *)op) -> ob_size) {
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142 Py_XDECREF(newitem);
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143 PyErr_SetString(PyExc_IndexError,
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144 "tuple assignment index out of range");
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145 return -1;
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146 }
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147 p = ((PyTupleObject *)op) -> ob_item + i;
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148 olditem = *p;
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149 *p = newitem;
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150 Py_XDECREF(olditem);
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151 return 0;
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152 }
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153
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154 /* Methods */
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155
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156 static void
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157 tupledealloc(op)
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158 register PyTupleObject *op;
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159 {
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160 register int i;
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161 for (i = 0; i < op->ob_size; i++)
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162 Py_XDECREF(op->ob_item[i]);
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163 #if MAXSAVESIZE > 0
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164 if (0 < op->ob_size && op->ob_size < MAXSAVESIZE) {
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165 op->ob_item[0] = (PyObject *) free_tuples[op->ob_size];
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166 free_tuples[op->ob_size] = op;
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167 } else
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168 #endif
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169 free((ANY *)op);
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170 }
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171
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172 static int
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173 tupleprint(op, fp, flags)
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174 PyTupleObject *op;
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175 FILE *fp;
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176 int flags;
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177 {
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178 int i;
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179 fprintf(fp, "(");
288
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180 for (i = 0; i < op->ob_size; i++) {
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181 if (i > 0)
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182 fprintf(fp, ", ");
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183 if (PyObject_Print(op->ob_item[i], fp, 0) != 0)
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184 return -1;
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185 }
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186 if (op->ob_size == 1)
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187 fprintf(fp, ",");
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188 fprintf(fp, ")");
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189 return 0;
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190 }
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191
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192 static PyObject *
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193 tuplerepr(v)
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194 PyTupleObject *v;
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195 {
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196 PyObject *s, *comma;
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197 int i;
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198 s = PyString_FromString("(");
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199 comma = PyString_FromString(", ");
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200 for (i = 0; i < v->ob_size && s != NULL; i++) {
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201 if (i > 0)
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202 PyString_Concat(&s, comma);
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203 PyString_ConcatAndDel(&s, PyObject_Repr(v->ob_item[i]));
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204 }
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205 Py_DECREF(comma);
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206 if (v->ob_size == 1)
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207 PyString_ConcatAndDel(&s, PyString_FromString(","));
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208 PyString_ConcatAndDel(&s, PyString_FromString(")"));
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209 return s;
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210 }
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211
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212 static int
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213 tuplecompare(v, w)
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214 register PyTupleObject *v, *w;
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215 {
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216 register int len =
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217 (v->ob_size < w->ob_size) ? v->ob_size : w->ob_size;
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218 register int i;
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219 for (i = 0; i < len; i++) {
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220 int cmp = PyObject_Compare(v->ob_item[i], w->ob_item[i]);
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221 if (cmp != 0)
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222 return cmp;
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223 }
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224 return v->ob_size - w->ob_size;
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225 }
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226
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227 static long
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228 tuplehash(v)
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229 PyTupleObject *v;
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230 {
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231 register long x, y;
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232 register int len = v->ob_size;
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233 register PyObject **p;
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234 x = 0x345678L;
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235 p = v->ob_item;
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236 while (--len >= 0) {
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237 y = PyObject_Hash(*p++);
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238 if (y == -1)
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239 return -1;
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240 x = (1000003*x) ^ y;
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241 }
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242 x ^= v->ob_size;
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243 if (x == -1)
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244 x = -2;
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245 return x;
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246 }
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247
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248 static int
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249 tuplelength(a)
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250 PyTupleObject *a;
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251 {
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252 return a->ob_size;
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253 }
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254
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255 static PyObject *
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256 tupleitem(a, i)
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257 register PyTupleObject *a;
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258 register int i;
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259 {
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260 if (i < 0 || i >= a->ob_size) {
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261 PyErr_SetString(PyExc_IndexError, "tuple index out of range");
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262 return NULL;
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263 }
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264 Py_INCREF(a->ob_item[i]);
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265 return a->ob_item[i];
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266 }
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267
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268 static PyObject *
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269 tupleslice(a, ilow, ihigh)
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270 register PyTupleObject *a;
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271 register int ilow, ihigh;
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272 {
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273 register PyTupleObject *np;
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274 register int i;
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275 if (ilow < 0)
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276 ilow = 0;
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277 if (ihigh > a->ob_size)
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278 ihigh = a->ob_size;
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279 if (ihigh < ilow)
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280 ihigh = ilow;
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281 if (ilow == 0 && ihigh == a->ob_size) {
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282 /* XXX can only do this if tuples are immutable! */
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283 Py_INCREF(a);
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284 return (PyObject *)a;
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285 }
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286 np = (PyTupleObject *)PyTuple_New(ihigh - ilow);
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287 if (np == NULL)
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288 return NULL;
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289 for (i = ilow; i < ihigh; i++) {
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290 PyObject *v = a->ob_item[i];
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291 Py_INCREF(v);
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292 np->ob_item[i - ilow] = v;
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293 }
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294 return (PyObject *)np;
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295 }
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296
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297 PyObject *
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298 PyTuple_GetSlice(op, i, j)
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299 PyObject *op;
599
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300 int i, j;
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301 {
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302 if (op == NULL || !PyTuple_Check(op)) {
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303 PyErr_BadInternalCall();
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304 return NULL;
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305 }
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306 return tupleslice((PyTupleObject *)op, i, j);
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307 }
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308
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309 static PyObject *
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310 tupleconcat(a, bb)
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311 register PyTupleObject *a;
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312 register PyObject *bb;
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313 {
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314 register int size;
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315 register int i;
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316 PyTupleObject *np;
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317 if (!PyTuple_Check(bb)) {
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318 PyErr_BadArgument();
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319 return NULL;
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320 }
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321 #define b ((PyTupleObject *)bb)
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322 size = a->ob_size + b->ob_size;
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323 np = (PyTupleObject *) PyTuple_New(size);
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324 if (np == NULL) {
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325 return NULL;
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326 }
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327 for (i = 0; i < a->ob_size; i++) {
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328 PyObject *v = a->ob_item[i];
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329 Py_INCREF(v);
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330 np->ob_item[i] = v;
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331 }
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332 for (i = 0; i < b->ob_size; i++) {
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333 PyObject *v = b->ob_item[i];
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334 Py_INCREF(v);
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335 np->ob_item[i + a->ob_size] = v;
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336 }
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337 return (PyObject *)np;
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338 #undef b
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339 }
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340
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341 static PyObject *
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342 tuplerepeat(a, n)
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343 PyTupleObject *a;
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344 int n;
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345 {
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346 int i, j;
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347 int size;
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348 PyTupleObject *np;
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349 PyObject **p;
258
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350 if (n < 0)
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351 n = 0;
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352 if (a->ob_size*n == a->ob_size) {
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353 /* Since tuples are immutable, we can return a shared
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354 copy in this case */
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355 Py_INCREF(a);
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356 return (PyObject *)a;
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357 }
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358 size = a->ob_size * n;
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359 np = (PyTupleObject *) PyTuple_New(size);
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360 if (np == NULL)
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361 return NULL;
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362 p = np->ob_item;
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363 for (i = 0; i < n; i++) {
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364 for (j = 0; j < a->ob_size; j++) {
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365 *p = a->ob_item[j];
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366 Py_INCREF(*p);
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367 p++;
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368 }
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369 }
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370 return (PyObject *) np;
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371 }
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372
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373 static PySequenceMethods tuple_as_sequence = {
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374 (inquiry)tuplelength, /*sq_length*/
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375 (binaryfunc)tupleconcat, /*sq_concat*/
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376 (intargfunc)tuplerepeat, /*sq_repeat*/
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377 (intargfunc)tupleitem, /*sq_item*/
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378 (intintargfunc)tupleslice, /*sq_slice*/
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379 0, /*sq_ass_item*/
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380 0, /*sq_ass_slice*/
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381 };
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382
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383 PyTypeObject PyTuple_Type = {
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384 PyObject_HEAD_INIT(&PyType_Type)
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385 0,
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386 "tuple",
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387 sizeof(PyTupleObject) - sizeof(PyObject *),
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388 sizeof(PyObject *),
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389 (destructor)tupledealloc, /*tp_dealloc*/
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390 (printfunc)tupleprint, /*tp_print*/
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391 0, /*tp_getattr*/
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392 0, /*tp_setattr*/
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393 (cmpfunc)tuplecompare, /*tp_compare*/
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394 (reprfunc)tuplerepr, /*tp_repr*/
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395 0, /*tp_as_number*/
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396 &tuple_as_sequence, /*tp_as_sequence*/
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397 0, /*tp_as_mapping*/
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398 (hashfunc)tuplehash, /*tp_hash*/
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399 };
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400
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401 /* The following function breaks the notion that tuples are immutable:
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402 it changes the size of a tuple. We get away with this only if there
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403 is only one module referencing the object. You can also think of it
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404 as creating a new tuple object and destroying the old one, only
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405 more efficiently. In any case, don't use this if the tuple may
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406 already be known to some other part of the code...
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407 If last_is_sticky is set, the tuple will grow or shrink at the
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408 front, otherwise it will grow or shrink at the end. */
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409
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410 int
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411 _PyTuple_Resize(pv, newsize, last_is_sticky)
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412 PyObject **pv;
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413 int newsize;
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414 int last_is_sticky;
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415 {
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416 register PyTupleObject *v;
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417 register PyTupleObject *sv;
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418 int i;
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419 int sizediff;
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420
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421 v = (PyTupleObject *) *pv;
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422 if (v == NULL || !PyTuple_Check(v) || v->ob_refcnt != 1) {
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423 *pv = 0;
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424 Py_DECREF(v);
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425 PyErr_BadInternalCall();
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426 return -1;
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427 }
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428 sizediff = newsize - v->ob_size;
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429 if (sizediff == 0)
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430 return 0;
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431 /* XXX UNREF/NEWREF interface should be more symmetrical */
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432 #ifdef Py_REF_DEBUG
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433 --_Py_RefTotal;
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434 #endif
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435 _Py_ForgetReference(v);
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436 if (last_is_sticky && sizediff < 0) {
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437 /* shrinking:
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438 move entries to the front and zero moved entries */
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439 for (i = 0; i < newsize; i++) {
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440 Py_XDECREF(v->ob_item[i]);
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441 v->ob_item[i] = v->ob_item[i - sizediff];
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442 v->ob_item[i - sizediff] = NULL;
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443 }
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444 }
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445 for (i = newsize; i < v->ob_size; i++) {
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446 Py_XDECREF(v->ob_item[i]);
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447 v->ob_item[i] = NULL;
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448 }
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449 sv = (PyTupleObject *)
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450 realloc((char *)v,
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451 sizeof(PyTupleObject) + newsize * sizeof(PyObject *));
d1447950fa04 Quickly renamed the last directory.
Guido van Rossum <guido@python.org>
parents: 4733
diff changeset
452 *pv = (PyObject *) sv;
1380
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
453 if (sv == NULL) {
5396
d1447950fa04 Quickly renamed the last directory.
Guido van Rossum <guido@python.org>
parents: 4733
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454 PyMem_DEL(v);
d1447950fa04 Quickly renamed the last directory.
Guido van Rossum <guido@python.org>
parents: 4733
diff changeset
455 PyErr_NoMemory();
1369
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
456 return -1;
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
457 }
5396
d1447950fa04 Quickly renamed the last directory.
Guido van Rossum <guido@python.org>
parents: 4733
diff changeset
458 _Py_NewReference(sv);
1380
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
459 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
460 sv->ob_item[i] = NULL;
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
461 if (last_is_sticky && sizediff > 0) {
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
462 /* 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
463 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
464 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
465 sv->ob_item[i - sizediff] = NULL;
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 }
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
468 sv->ob_size = newsize;
1369
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
469 return 0;
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
470 }
5936
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
471
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
472 void
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
473 PyTuple_Fini()
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
474 {
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
475 #if MAXSAVESIZE > 0
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
476 int i;
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
477
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
478 Py_XDECREF(free_tuples[0]);
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
479 free_tuples[0] = NULL;
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
480
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
481 for (i = 1; i < MAXSAVESIZE; i++) {
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
482 PyTupleObject *p, *q;
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
483 p = free_tuples[i];
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
484 free_tuples[i] = NULL;
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
485 while (p) {
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
486 q = p;
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
487 p = (PyTupleObject *)(p->ob_item[0]);
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
488 PyMem_DEL(q);
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
489 }
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
490 }
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
491 #endif
80d24364b932 Added _Fini() routines to free up some memory
Guido van Rossum <guido@python.org>
parents: 5396
diff changeset
492 }