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annotate Objects/tupleobject.c @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 65d2d8e67da3
children 3c7812bfa1a4
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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 "allobjects.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 tupleobject *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 object *
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52 newtupleobject(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 tupleobject *op;
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57 if (size < 0) {
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58 err_badcall();
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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 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 (object *) op;
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69 }
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70 if (0 < size && size < MAXSAVESIZE && (op = free_tuples[size]) != NULL) {
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71 free_tuples[size] = (tupleobject *) op->ob_item[0];
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72 #ifdef COUNT_ALLOCS
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73 fast_tuple_allocs++;
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74 #endif
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75 } else
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76 #endif
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77 {
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78 op = (tupleobject *)
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79 malloc(sizeof(tupleobject) + size * sizeof(object *));
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80 if (op == NULL)
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81 return err_nomem();
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82 }
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83 op->ob_type = &Tupletype;
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84 op->ob_size = size;
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85 for (i = 0; i < size; i++)
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86 op->ob_item[i] = NULL;
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87 NEWREF(op);
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88 #if MAXSAVESIZE > 0
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89 if (size == 0) {
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90 free_tuples[0] = op;
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91 INCREF(op); /* extra INCREF so that this is never freed */
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92 }
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93 #endif
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94 return (object *) op;
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95 }
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96
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97 int
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98 gettuplesize(op)
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99 register object *op;
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100 {
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101 if (!is_tupleobject(op)) {
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102 err_badcall();
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103 return -1;
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104 }
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105 else
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106 return ((tupleobject *)op)->ob_size;
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107 }
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108
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109 object *
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110 gettupleitem(op, i)
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111 register object *op;
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112 register int i;
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113 {
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114 if (!is_tupleobject(op)) {
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115 err_badcall();
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116 return NULL;
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117 }
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118 if (i < 0 || i >= ((tupleobject *)op) -> ob_size) {
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119 err_setstr(IndexError, "tuple index out of range");
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120 return NULL;
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121 }
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122 return ((tupleobject *)op) -> ob_item[i];
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123 }
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124
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125 int
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126 settupleitem(op, i, newitem)
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127 register object *op;
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128 register int i;
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129 object *newitem;
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130 {
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131 register object *olditem;
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132 register object **p;
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133 if (!is_tupleobject(op)) {
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134 XDECREF(newitem);
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135 err_badcall();
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136 return -1;
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137 }
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138 if (i < 0 || i >= ((tupleobject *)op) -> ob_size) {
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139 XDECREF(newitem);
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140 err_setstr(IndexError, "tuple assignment index out of range");
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141 return -1;
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142 }
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143 p = ((tupleobject *)op) -> ob_item + i;
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144 olditem = *p;
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145 *p = newitem;
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146 XDECREF(olditem);
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147 return 0;
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148 }
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149
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150 /* Methods */
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151
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152 static void
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153 tupledealloc(op)
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154 register tupleobject *op;
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155 {
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156 register int i;
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157 for (i = 0; i < op->ob_size; i++)
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158 XDECREF(op->ob_item[i]);
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159 #if MAXSAVESIZE > 0
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160 if (0 < op->ob_size && op->ob_size < MAXSAVESIZE) {
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161 op->ob_item[0] = (object *) free_tuples[op->ob_size];
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162 free_tuples[op->ob_size] = op;
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163 } else
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164 #endif
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165 free((ANY *)op);
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166 }
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167
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168 static int
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169 tupleprint(op, fp, flags)
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170 tupleobject *op;
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171 FILE *fp;
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172 int flags;
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173 {
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174 int i;
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175 fprintf(fp, "(");
288
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176 for (i = 0; i < op->ob_size; i++) {
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177 if (i > 0)
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178 fprintf(fp, ", ");
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90c5e2bb4da5 * posixmodule.c: added set{uid,gid}.
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179 if (printobject(op->ob_item[i], fp, 0) != 0)
288
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180 return -1;
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181 }
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182 if (op->ob_size == 1)
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183 fprintf(fp, ",");
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184 fprintf(fp, ")");
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185 return 0;
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186 }
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187
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188 static object *
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189 tuplerepr(v)
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190 tupleobject *v;
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191 {
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192 object *s, *comma;
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193 int i;
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194 s = newstringobject("(");
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195 comma = newstringobject(", ");
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196 for (i = 0; i < v->ob_size && s != NULL; i++) {
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197 if (i > 0)
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198 joinstring(&s, comma);
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199 joinstring_decref(&s, reprobject(v->ob_item[i]));
6
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200 }
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201 DECREF(comma);
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202 if (v->ob_size == 1)
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203 joinstring_decref(&s, newstringobject(","));
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204 joinstring_decref(&s, newstringobject(")"));
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205 return s;
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206 }
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207
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208 static int
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209 tuplecompare(v, w)
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210 register tupleobject *v, *w;
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211 {
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212 register int len =
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213 (v->ob_size < w->ob_size) ? v->ob_size : w->ob_size;
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214 register int i;
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215 for (i = 0; i < len; i++) {
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216 int cmp = cmpobject(v->ob_item[i], w->ob_item[i]);
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217 if (cmp != 0)
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218 return cmp;
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219 }
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220 return v->ob_size - w->ob_size;
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221 }
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222
1257
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223 static long
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224 tuplehash(v)
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225 tupleobject *v;
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226 {
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227 register long x, y;
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228 register int len = v->ob_size;
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229 register object **p;
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230 x = 0x345678L;
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231 p = v->ob_item;
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232 while (--len >= 0) {
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233 y = hashobject(*p++);
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234 if (y == -1)
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235 return -1;
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236 x = (x + x + x) ^ y;
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237 }
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238 x ^= v->ob_size;
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239 if (x == -1)
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240 x = -2;
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241 return x;
1cabc2b6c970 * Changed all copyright messages to include 1993.
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242 }
1cabc2b6c970 * Changed all copyright messages to include 1993.
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243
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244 static int
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245 tuplelength(a)
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246 tupleobject *a;
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247 {
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248 return a->ob_size;
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249 }
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250
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251 static object *
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252 tupleitem(a, i)
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253 register tupleobject *a;
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254 register int i;
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255 {
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256 if (i < 0 || i >= a->ob_size) {
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257 err_setstr(IndexError, "tuple index out of range");
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258 return NULL;
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259 }
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260 INCREF(a->ob_item[i]);
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261 return a->ob_item[i];
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262 }
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263
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264 static object *
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265 tupleslice(a, ilow, ihigh)
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266 register tupleobject *a;
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267 register int ilow, ihigh;
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268 {
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269 register tupleobject *np;
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270 register int i;
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271 if (ilow < 0)
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272 ilow = 0;
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273 if (ihigh > a->ob_size)
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274 ihigh = a->ob_size;
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275 if (ihigh < ilow)
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276 ihigh = ilow;
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277 if (ilow == 0 && ihigh == a->ob_size) {
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278 /* XXX can only do this if tuples are immutable! */
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279 INCREF(a);
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280 return (object *)a;
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281 }
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282 np = (tupleobject *)newtupleobject(ihigh - ilow);
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283 if (np == NULL)
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284 return NULL;
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285 for (i = ilow; i < ihigh; i++) {
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286 object *v = a->ob_item[i];
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287 INCREF(v);
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288 np->ob_item[i - ilow] = v;
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289 }
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290 return (object *)np;
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291 }
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292
599
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293 object *
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294 gettupleslice(op, i, j)
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295 object *op;
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296 int i, j;
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297 {
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298 if (op == NULL || !is_tupleobject(op)) {
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299 err_badcall();
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300 return NULL;
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301 }
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302 return tupleslice((tupleobject *)op, i, j);
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303 }
a347933a6d92 New function gettupleslice(v, i, j).
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304
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305 static object *
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306 tupleconcat(a, bb)
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307 register tupleobject *a;
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308 register object *bb;
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309 {
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310 register int size;
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311 register int i;
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312 tupleobject *np;
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313 if (!is_tupleobject(bb)) {
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314 err_badarg();
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315 return NULL;
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316 }
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317 #define b ((tupleobject *)bb)
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318 size = a->ob_size + b->ob_size;
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319 np = (tupleobject *) newtupleobject(size);
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320 if (np == NULL) {
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321 return NULL;
6
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322 }
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323 for (i = 0; i < a->ob_size; i++) {
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324 object *v = a->ob_item[i];
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325 INCREF(v);
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326 np->ob_item[i] = v;
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327 }
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328 for (i = 0; i < b->ob_size; i++) {
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329 object *v = b->ob_item[i];
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330 INCREF(v);
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331 np->ob_item[i + a->ob_size] = v;
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332 }
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333 return (object *)np;
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334 #undef b
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335 }
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336
258
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337 static object *
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338 tuplerepeat(a, n)
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339 tupleobject *a;
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340 int n;
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341 {
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342 int i, j;
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343 int size;
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344 tupleobject *np;
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345 object **p;
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346 if (n < 0)
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347 n = 0;
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348 if (a->ob_size*n == a->ob_size) {
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349 /* Since tuples are immutable, we can return a shared
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350 copy in this case */
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351 INCREF(a);
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352 return (object *)a;
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353 }
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354 size = a->ob_size * n;
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355 np = (tupleobject *) newtupleobject(size);
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356 if (np == NULL)
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357 return NULL;
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358 p = np->ob_item;
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359 for (i = 0; i < n; i++) {
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360 for (j = 0; j < a->ob_size; j++) {
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361 *p = a->ob_item[j];
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362 INCREF(*p);
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diff changeset
363 p++;
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364 }
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365 }
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366 return (object *) np;
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367 }
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368
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369 static sequence_methods tuple_as_sequence = {
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370 (inquiry)tuplelength, /*sq_length*/
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371 (binaryfunc)tupleconcat, /*sq_concat*/
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372 (intargfunc)tuplerepeat, /*sq_repeat*/
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373 (intargfunc)tupleitem, /*sq_item*/
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374 (intintargfunc)tupleslice, /*sq_slice*/
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375 0, /*sq_ass_item*/
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376 0, /*sq_ass_slice*/
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377 };
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378
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379 typeobject Tupletype = {
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380 OB_HEAD_INIT(&Typetype)
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381 0,
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382 "tuple",
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383 sizeof(tupleobject) - sizeof(object *),
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384 sizeof(object *),
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385 (destructor)tupledealloc, /*tp_dealloc*/
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386 (printfunc)tupleprint, /*tp_print*/
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387 0, /*tp_getattr*/
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388 0, /*tp_setattr*/
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389 (cmpfunc)tuplecompare, /*tp_compare*/
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390 (reprfunc)tuplerepr, /*tp_repr*/
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391 0, /*tp_as_number*/
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392 &tuple_as_sequence, /*tp_as_sequence*/
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393 0, /*tp_as_mapping*/
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394 (hashfunc)tuplehash, /*tp_hash*/
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395 };
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396
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397 /* The following function breaks the notion that tuples are immutable:
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398 it changes the size of a tuple. We get away with this only if there
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399 is only one module referencing the object. You can also think of it
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400 as creating a new tuple object and destroying the old one, only
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diff changeset
401 more efficiently. In any case, don't use this if the tuple may
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diff changeset
402 already be known to some other part of the code...
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diff changeset
403 If last_is_sticky is set, the tuple will grow or shrink at the
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diff changeset
404 front, otherwise it will grow or shrink at the end. */
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405
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406 int
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diff changeset
407 resizetuple(pv, newsize, last_is_sticky)
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408 object **pv;
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409 int newsize;
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diff changeset
410 int last_is_sticky;
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411 {
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412 register tupleobject *v;
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413 register tupleobject *sv;
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diff changeset
414 int i;
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diff changeset
415 int sizediff;
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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parents: 1369
diff changeset
416
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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parents: 1369
diff changeset
417 v = (tupleobject *) *pv;
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parents: 2612
diff changeset
418 if (v == NULL || !is_tupleobject(v) || v->ob_refcnt != 1) {
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diff changeset
419 *pv = 0;
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diff changeset
420 DECREF(v);
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diff changeset
421 err_badcall();
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diff changeset
422 return -1;
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diff changeset
423 }
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424 sizediff = newsize - v->ob_size;
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diff changeset
425 if (sizediff == 0)
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diff changeset
426 return 0;
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diff changeset
427 /* XXX UNREF/NEWREF interface should be more symmetrical */
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parents: 2888
diff changeset
428 #ifdef Py_REF_DEBUG
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parents: 2504
diff changeset
429 --_Py_RefTotal;
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diff changeset
430 #endif
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diff changeset
431 UNREF(v);
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diff changeset
432 if (last_is_sticky && sizediff < 0) {
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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diff changeset
433 /* shrinking: move entries to the front and zero moved entries */
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parents: 1369
diff changeset
434 for (i = 0; i < newsize; i++) {
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parents: 1369
diff changeset
435 XDECREF(v->ob_item[i]);
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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parents: 1369
diff changeset
436 v->ob_item[i] = v->ob_item[i - sizediff];
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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diff changeset
437 v->ob_item[i - sizediff] = NULL;
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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parents: 1369
diff changeset
438 }
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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parents: 1369
diff changeset
439 }
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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diff changeset
440 for (i = newsize; i < v->ob_size; i++) {
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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diff changeset
441 XDECREF(v->ob_item[i]);
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diff changeset
442 v->ob_item[i] = NULL;
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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parents: 1369
diff changeset
443 }
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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parents: 1369
diff changeset
444 sv = (tupleobject *)
1369
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diff changeset
445 realloc((char *)v,
89e1e5d9ccbf * compile.[ch]: support for lambda()
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diff changeset
446 sizeof(tupleobject) + newsize * sizeof(object *));
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diff changeset
447 *pv = (object *) sv;
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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diff changeset
448 if (sv == NULL) {
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diff changeset
449 DEL(v);
89e1e5d9ccbf * compile.[ch]: support for lambda()
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diff changeset
450 err_nomem();
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diff changeset
451 return -1;
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diff changeset
452 }
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diff changeset
453 NEWREF(sv);
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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diff changeset
454 for (i = sv->ob_size; i < newsize; i++)
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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diff changeset
455 sv->ob_item[i] = NULL;
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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diff changeset
456 if (last_is_sticky && sizediff > 0) {
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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parents: 1369
diff changeset
457 /* growing: move entries to the end and zero moved entries */
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
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parents: 1369
diff changeset
458 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
459 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
460 sv->ob_item[i - sizediff] = NULL;
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
461 }
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
462 }
a4aa83012af3 Fixed bugs in resizetuple and extended the interface.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1369
diff changeset
463 sv->ob_size = newsize;
1369
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
464 return 0;
89e1e5d9ccbf * compile.[ch]: support for lambda()
Guido van Rossum <guido@python.org>
parents: 1352
diff changeset
465 }