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annotate Include/dictobject.h @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents b36cb4602e21
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #ifndef Py_DICTOBJECT_H
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2 #define Py_DICTOBJECT_H
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3 #ifdef __cplusplus
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4 extern "C" {
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5 #endif
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6
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7
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8 /* Dictionary object type -- mapping from hashable object to object */
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9
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10 /* The distribution includes a separate file, Objects/dictnotes.txt,
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11 describing explorations into dictionary design and optimization.
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12 It covers typical dictionary use patterns, the parameters for
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13 tuning dictionaries, and several ideas for possible optimizations.
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14 */
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15
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16 /*
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17 There are three kinds of slots in the table:
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18
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19 1. Unused. me_key == me_value == NULL
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20 Does not hold an active (key, value) pair now and never did. Unused can
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21 transition to Active upon key insertion. This is the only case in which
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22 me_key is NULL, and is each slot's initial state.
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23
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24 2. Active. me_key != NULL and me_key != dummy and me_value != NULL
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25 Holds an active (key, value) pair. Active can transition to Dummy upon
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26 key deletion. This is the only case in which me_value != NULL.
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27
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28 3. Dummy. me_key == dummy and me_value == NULL
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29 Previously held an active (key, value) pair, but that was deleted and an
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30 active pair has not yet overwritten the slot. Dummy can transition to
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31 Active upon key insertion. Dummy slots cannot be made Unused again
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32 (cannot have me_key set to NULL), else the probe sequence in case of
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33 collision would have no way to know they were once active.
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34
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35 Note: .popitem() abuses the me_hash field of an Unused or Dummy slot to
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36 hold a search finger. The me_hash field of Unused or Dummy slots has no
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37 meaning otherwise.
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38 */
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39
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40 /* PyDict_MINSIZE is the minimum size of a dictionary. This many slots are
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41 * allocated directly in the dict object (in the ma_smalltable member).
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42 * It must be a power of 2, and at least 4. 8 allows dicts with no more
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43 * than 5 active entries to live in ma_smalltable (and so avoid an
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44 * additional malloc); instrumentation suggested this suffices for the
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45 * majority of dicts (consisting mostly of usually-small instance dicts and
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46 * usually-small dicts created to pass keyword arguments).
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47 */
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48 #define PyDict_MINSIZE 8
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49
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50 typedef struct {
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51 /* Cached hash code of me_key. Note that hash codes are C longs.
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52 * We have to use Py_ssize_t instead because dict_popitem() abuses
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53 * me_hash to hold a search finger.
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54 */
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55 Py_ssize_t me_hash;
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56 PyObject *me_key;
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57 PyObject *me_value;
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58 } PyDictEntry;
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59
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60 /*
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61 To ensure the lookup algorithm terminates, there must be at least one Unused
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62 slot (NULL key) in the table.
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63 The value ma_fill is the number of non-NULL keys (sum of Active and Dummy);
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64 ma_used is the number of non-NULL, non-dummy keys (== the number of non-NULL
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65 values == the number of Active items).
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66 To avoid slowing down lookups on a near-full table, we resize the table when
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67 it's two-thirds full.
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68 */
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69 typedef struct _dictobject PyDictObject;
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70 struct _dictobject {
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71 PyObject_HEAD
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72 Py_ssize_t ma_fill; /* # Active + # Dummy */
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73 Py_ssize_t ma_used; /* # Active */
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74
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75 /* The table contains ma_mask + 1 slots, and that's a power of 2.
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76 * We store the mask instead of the size because the mask is more
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77 * frequently needed.
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78 */
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79 Py_ssize_t ma_mask;
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80
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81 /* ma_table points to ma_smalltable for small tables, else to
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82 * additional malloc'ed memory. ma_table is never NULL! This rule
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83 * saves repeated runtime null-tests in the workhorse getitem and
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84 * setitem calls.
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85 */
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86 PyDictEntry *ma_table;
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87 PyDictEntry *(*ma_lookup)(PyDictObject *mp, PyObject *key, long hash);
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88 PyDictEntry ma_smalltable[PyDict_MINSIZE];
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89 };
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90
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91 PyAPI_DATA(PyTypeObject) PyDict_Type;
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92 PyAPI_DATA(PyTypeObject) PyDictIterKey_Type;
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93 PyAPI_DATA(PyTypeObject) PyDictIterValue_Type;
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94 PyAPI_DATA(PyTypeObject) PyDictIterItem_Type;
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95 PyAPI_DATA(PyTypeObject) PyDictKeys_Type;
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96 PyAPI_DATA(PyTypeObject) PyDictItems_Type;
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97 PyAPI_DATA(PyTypeObject) PyDictValues_Type;
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98
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99 #define PyDict_Check(op) \
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100 PyType_FastSubclass(Py_TYPE(op), Py_TPFLAGS_DICT_SUBCLASS)
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101 #define PyDict_CheckExact(op) (Py_TYPE(op) == &PyDict_Type)
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102 #define PyDictKeys_Check(op) (Py_TYPE(op) == &PyDictKeys_Type)
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103 #define PyDictItems_Check(op) (Py_TYPE(op) == &PyDictItems_Type)
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104 #define PyDictValues_Check(op) (Py_TYPE(op) == &PyDictValues_Type)
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105 /* This excludes Values, since they are not sets. */
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106 # define PyDictViewSet_Check(op) \
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107 (PyDictKeys_Check(op) || PyDictItems_Check(op))
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108
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109 PyAPI_FUNC(PyObject *) PyDict_New(void);
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110 PyAPI_FUNC(PyObject *) PyDict_GetItem(PyObject *mp, PyObject *key);
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111 PyAPI_FUNC(int) PyDict_SetItem(PyObject *mp, PyObject *key, PyObject *item);
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112 PyAPI_FUNC(int) PyDict_DelItem(PyObject *mp, PyObject *key);
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113 PyAPI_FUNC(void) PyDict_Clear(PyObject *mp);
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114 PyAPI_FUNC(int) PyDict_Next(
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115 PyObject *mp, Py_ssize_t *pos, PyObject **key, PyObject **value);
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116 PyAPI_FUNC(int) _PyDict_Next(
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117 PyObject *mp, Py_ssize_t *pos, PyObject **key, PyObject **value, long *hash);
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118 PyAPI_FUNC(PyObject *) PyDict_Keys(PyObject *mp);
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119 PyAPI_FUNC(PyObject *) PyDict_Values(PyObject *mp);
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120 PyAPI_FUNC(PyObject *) PyDict_Items(PyObject *mp);
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121 PyAPI_FUNC(Py_ssize_t) PyDict_Size(PyObject *mp);
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122 PyAPI_FUNC(PyObject *) PyDict_Copy(PyObject *mp);
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123 PyAPI_FUNC(int) PyDict_Contains(PyObject *mp, PyObject *key);
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124 PyAPI_FUNC(int) _PyDict_Contains(PyObject *mp, PyObject *key, long hash);
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125 PyAPI_FUNC(PyObject *) _PyDict_NewPresized(Py_ssize_t minused);
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126 PyAPI_FUNC(void) _PyDict_MaybeUntrack(PyObject *mp);
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127
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128 /* PyDict_Update(mp, other) is equivalent to PyDict_Merge(mp, other, 1). */
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129 PyAPI_FUNC(int) PyDict_Update(PyObject *mp, PyObject *other);
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130
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131 /* PyDict_Merge updates/merges from a mapping object (an object that
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132 supports PyMapping_Keys() and PyObject_GetItem()). If override is true,
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133 the last occurrence of a key wins, else the first. The Python
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134 dict.update(other) is equivalent to PyDict_Merge(dict, other, 1).
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135 */
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136 PyAPI_FUNC(int) PyDict_Merge(PyObject *mp,
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137 PyObject *other,
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138 int override);
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139
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140 /* PyDict_MergeFromSeq2 updates/merges from an iterable object producing
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141 iterable objects of length 2. If override is true, the last occurrence
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142 of a key wins, else the first. The Python dict constructor dict(seq2)
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143 is equivalent to dict={}; PyDict_MergeFromSeq(dict, seq2, 1).
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144 */
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145 PyAPI_FUNC(int) PyDict_MergeFromSeq2(PyObject *d,
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146 PyObject *seq2,
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147 int override);
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148
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149 PyAPI_FUNC(PyObject *) PyDict_GetItemString(PyObject *dp, const char *key);
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150 PyAPI_FUNC(int) PyDict_SetItemString(PyObject *dp, const char *key, PyObject *item);
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151 PyAPI_FUNC(int) PyDict_DelItemString(PyObject *dp, const char *key);
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152
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153 #ifdef __cplusplus
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154 }
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155 #endif
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156 #endif /* !Py_DICTOBJECT_H */