Mercurial > cpython-lru_cache-weakref

annotate Parser/node.c @ 14150:302dfd53b3c8 legacy-trunk

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Make sure Thomas Wouters has enough to do. ;-) (Some of this is in-progress; this also serves as a reminded to me to check this out once it is written.)
author Fred Drake <fdrake@acm.org>
date Thu, 24 Aug 2000 00:50:27 +0000
parents 21ec69a56228
children 6f6f965c5e2d
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1 /***********************************************************
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2 Copyright (c) 2000, BeOpen.com.
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3 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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4 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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5 All rights reserved.
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6
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7 See the file "Misc/COPYRIGHT" for information on usage and
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8 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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9 ******************************************************************/
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10
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11 #ifdef HAVE_LIMITS_H
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12 #include <limits.h>
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13 #endif
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14 #ifndef INT_MAX
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15 #define INT_MAX 2147483647
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16 #endif
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17
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18 /* Parse tree node implementation */
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19
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20 #include "pgenheaders.h"
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21 #include "node.h"
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22 #include "errcode.h"
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23
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24 node *
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25 PyNode_New(int type)
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26 {
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27 node *n = PyMem_NEW(node, 1);
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28 if (n == NULL)
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29 return NULL;
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30 n->n_type = type;
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31 n->n_str = NULL;
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32 n->n_lineno = 0;
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33 n->n_nchildren = 0;
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34 n->n_child = NULL;
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35 return n;
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36 }
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37
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38 #define XXX 3 /* Node alignment factor to speed up realloc */
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39 #define XXXROUNDUP(n) ((n) == 1 ? 1 : ((n) + XXX - 1) / XXX * XXX)
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40
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41 int
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42 PyNode_AddChild(register node *n1, int type, char *str, int lineno)
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43 {
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44 register int nch = n1->n_nchildren;
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45 register int nch1 = nch+1;
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46 register node *n;
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47 if (nch == INT_MAX || nch < 0)
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48 return E_OVERFLOW;
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49 if (XXXROUNDUP(nch) < nch1) {
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50 n = n1->n_child;
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51 nch1 = XXXROUNDUP(nch1);
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52 PyMem_RESIZE(n, node, nch1);
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53 if (n == NULL)
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54 return E_NOMEM;
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55 n1->n_child = n;
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56 }
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57 n = &n1->n_child[n1->n_nchildren++];
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58 n->n_type = type;
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59 n->n_str = str;
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60 n->n_lineno = lineno;
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61 n->n_nchildren = 0;
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62 n->n_child = NULL;
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63 return 0;
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64 }
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65
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66 /* Forward */
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67 static void freechildren(node *);
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70 void
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71 PyNode_Free(node *n)
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72 {
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73 if (n != NULL) {
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74 freechildren(n);
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75 PyMem_DEL(n);
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76 }
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77 }
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78
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79 static void
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80 freechildren(node *n)
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81 {
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82 int i;
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83 for (i = NCH(n); --i >= 0; )
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84 freechildren(CHILD(n, i));
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85 if (n->n_child != NULL)
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86 PyMem_DEL(n->n_child);
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87 if (STR(n) != NULL)
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88 PyMem_DEL(STR(n));
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89 }