Mercurial > cpython-lru_cache-weakref

annotate Parser/node.c @ 58689:514b56efd89a 3.1

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Merged revisions 77962 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ................ r77962 | r.david.murray | 2010-02-04 11:41:57 -0500 (Thu, 04 Feb 2010) | 17 lines Merged revisions 77943,77959-77960 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77943 | r.david.murray | 2010-02-03 08:36:23 -0500 (Wed, 03 Feb 2010) | 2 lines Explicitly mention the default value for formatdate's usegmt parameter. ........ r77959 | nick.coghlan | 2010-02-04 07:43:58 -0500 (Thu, 04 Feb 2010) | 1 line Issue 6760: Clarify args handling for subprocess.Popen. Patch by Chris Rebert ........ r77960 | r.david.murray | 2010-02-04 11:33:31 -0500 (Thu, 04 Feb 2010) | 2 lines Add Chris Rebert to ACKS for issue 6760 Popen doc improvements. ........ ................
author R. David Murray <rdmurray@bitdance.com>
date Thu, 04 Feb 2010 16:44:31 +0000
parents ac854cde3135
children fd25030223b0
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rev   line source
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1 /* Parse tree node implementation */
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2
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3 #include "Python.h"
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4 #include "node.h"
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5 #include "errcode.h"
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6
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7 node *
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8 PyNode_New(int type)
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9 {
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10 node *n = (node *) PyObject_MALLOC(1 * sizeof(node));
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11 if (n == NULL)
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12 return NULL;
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13 n->n_type = type;
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14 n->n_str = NULL;
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15 n->n_lineno = 0;
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16 n->n_nchildren = 0;
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17 n->n_child = NULL;
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18 return n;
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19 }
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20
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21 /* See comments at XXXROUNDUP below. Returns -1 on overflow. */
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22 static int
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23 fancy_roundup(int n)
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24 {
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25 /* Round up to the closest power of 2 >= n. */
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26 int result = 256;
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27 assert(n > 128);
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28 while (result < n) {
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29 result <<= 1;
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30 if (result <= 0)
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31 return -1;
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32 }
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33 return result;
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34 }
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35
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36 /* A gimmick to make massive numbers of reallocs quicker. The result is
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37 * a number >= the input. In PyNode_AddChild, it's used like so, when
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38 * we're about to add child number current_size + 1:
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39 *
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40 * if XXXROUNDUP(current_size) < XXXROUNDUP(current_size + 1):
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41 * allocate space for XXXROUNDUP(current_size + 1) total children
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42 * else:
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43 * we already have enough space
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44 *
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45 * Since a node starts out empty, we must have
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46 *
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47 * XXXROUNDUP(0) < XXXROUNDUP(1)
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48 *
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49 * so that we allocate space for the first child. One-child nodes are very
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50 * common (presumably that would change if we used a more abstract form
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51 * of syntax tree), so to avoid wasting memory it's desirable that
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52 * XXXROUNDUP(1) == 1. That in turn forces XXXROUNDUP(0) == 0.
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53 *
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54 * Else for 2 <= n <= 128, we round up to the closest multiple of 4. Why 4?
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55 * Rounding up to a multiple of an exact power of 2 is very efficient, and
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56 * most nodes with more than one child have <= 4 kids.
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57 *
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58 * Else we call fancy_roundup() to grow proportionately to n. We've got an
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59 * extreme case then (like test_longexp.py), and on many platforms doing
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60 * anything less than proportional growth leads to exorbitant runtime
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61 * (e.g., MacPython), or extreme fragmentation of user address space (e.g.,
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62 * Win98).
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63 *
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64 * In a run of compileall across the 2.3a0 Lib directory, Andrew MacIntyre
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65 * reported that, with this scheme, 89% of PyObject_REALLOC calls in
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66 * PyNode_AddChild passed 1 for the size, and 9% passed 4. So this usually
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67 * wastes very little memory, but is very effective at sidestepping
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68 * platform-realloc disasters on vulnerable platforms.
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69 *
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70 * Note that this would be straightforward if a node stored its current
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71 * capacity. The code is tricky to avoid that.
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72 */
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73 #define XXXROUNDUP(n) ((n) <= 1 ? (n) : \
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74 (n) <= 128 ? (((n) + 3) & ~3) : \
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75 fancy_roundup(n))
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77
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78 int
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79 PyNode_AddChild(register node *n1, int type, char *str, int lineno, int col_offset)
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80 {
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81 const int nch = n1->n_nchildren;
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82 int current_capacity;
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83 int required_capacity;
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84 node *n;
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85
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86 if (nch == INT_MAX || nch < 0)
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87 return E_OVERFLOW;
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88
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89 current_capacity = XXXROUNDUP(nch);
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90 required_capacity = XXXROUNDUP(nch + 1);
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91 if (current_capacity < 0 || required_capacity < 0)
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92 return E_OVERFLOW;
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93 if (current_capacity < required_capacity) {
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94 if (required_capacity > PY_SIZE_MAX / sizeof(node)) {
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95 return E_NOMEM;
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96 }
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97 n = n1->n_child;
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98 n = (node *) PyObject_REALLOC(n,
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99 required_capacity * sizeof(node));
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100 if (n == NULL)
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101 return E_NOMEM;
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102 n1->n_child = n;
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103 }
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104
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105 n = &n1->n_child[n1->n_nchildren++];
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106 n->n_type = type;
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107 n->n_str = str;
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108 n->n_lineno = lineno;
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109 n->n_col_offset = col_offset;
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110 n->n_nchildren = 0;
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111 n->n_child = NULL;
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112 return 0;
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113 }
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114
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115 /* Forward */
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116 static void freechildren(node *);
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117
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118
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119 void
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120 PyNode_Free(node *n)
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121 {
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122 if (n != NULL) {
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123 freechildren(n);
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124 PyObject_FREE(n);
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125 }
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126 }
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127
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128 static void
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129 freechildren(node *n)
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130 {
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131 int i;
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132 for (i = NCH(n); --i >= 0; )
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133 freechildren(CHILD(n, i));
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134 if (n->n_child != NULL)
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135 PyObject_FREE(n->n_child);
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136 if (STR(n) != NULL)
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137 PyObject_FREE(STR(n));
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138 }