Mercurial > cpython-lru_cache-weakref

annotate Modules/hashtable.h @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents 6e2089dbc5ad
children
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rev   line source
87401
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1 #ifndef Py_HASHTABLE_H
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2 #define Py_HASHTABLE_H
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3
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4 /* The whole API is private */
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5 #ifndef Py_LIMITED_API
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6
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7 typedef struct _Py_slist_item_s {
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8 struct _Py_slist_item_s *next;
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9 } _Py_slist_item_t;
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10
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11 typedef struct {
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12 _Py_slist_item_t *head;
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13 } _Py_slist_t;
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14
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15 #define _Py_SLIST_ITEM_NEXT(ITEM) (((_Py_slist_item_t *)ITEM)->next)
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16
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17 #define _Py_SLIST_HEAD(SLIST) (((_Py_slist_t *)SLIST)->head)
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18
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19 typedef struct {
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20 /* used by _Py_hashtable_t.buckets to link entries */
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21 _Py_slist_item_t _Py_slist_item;
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22
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23 const void *key;
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24 Py_uhash_t key_hash;
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25
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26 /* data follows */
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27 } _Py_hashtable_entry_t;
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28
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29 #define _PY_HASHTABLE_ENTRY_DATA(ENTRY) \
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30 ((char *)(ENTRY) + sizeof(_Py_hashtable_entry_t))
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31
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32 #define _Py_HASHTABLE_ENTRY_DATA_AS_VOID_P(ENTRY) \
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33 (*(void **)_PY_HASHTABLE_ENTRY_DATA(ENTRY))
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34
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35 #define _Py_HASHTABLE_ENTRY_READ_DATA(TABLE, DATA, DATA_SIZE, ENTRY) \
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36 do { \
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37 assert((DATA_SIZE) == (TABLE)->data_size); \
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38 memcpy(DATA, _PY_HASHTABLE_ENTRY_DATA(ENTRY), DATA_SIZE); \
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39 } while (0)
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40
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41 typedef Py_uhash_t (*_Py_hashtable_hash_func) (const void *key);
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42 typedef int (*_Py_hashtable_compare_func) (const void *key, const _Py_hashtable_entry_t *he);
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43 typedef void* (*_Py_hashtable_copy_data_func)(void *data);
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44 typedef void (*_Py_hashtable_free_data_func)(void *data);
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45 typedef size_t (*_Py_hashtable_get_data_size_func)(void *data);
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46
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47 typedef struct {
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48 /* allocate a memory block */
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49 void* (*malloc) (size_t size);
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50
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51 /* release a memory block */
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52 void (*free) (void *ptr);
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53 } _Py_hashtable_allocator_t;
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54
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55 typedef struct {
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56 size_t num_buckets;
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57 size_t entries; /* Total number of entries in the table. */
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58 _Py_slist_t *buckets;
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59 size_t data_size;
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60
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61 _Py_hashtable_hash_func hash_func;
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62 _Py_hashtable_compare_func compare_func;
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63 _Py_hashtable_copy_data_func copy_data_func;
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64 _Py_hashtable_free_data_func free_data_func;
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65 _Py_hashtable_get_data_size_func get_data_size_func;
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66 _Py_hashtable_allocator_t alloc;
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67 } _Py_hashtable_t;
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68
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69 /* hash and compare functions for integers and pointers */
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70 PyAPI_FUNC(Py_uhash_t) _Py_hashtable_hash_ptr(const void *key);
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71 PyAPI_FUNC(Py_uhash_t) _Py_hashtable_hash_int(const void *key);
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72 PyAPI_FUNC(int) _Py_hashtable_compare_direct(const void *key, const _Py_hashtable_entry_t *entry);
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73
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74 PyAPI_FUNC(_Py_hashtable_t *) _Py_hashtable_new(
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75 size_t data_size,
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76 _Py_hashtable_hash_func hash_func,
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77 _Py_hashtable_compare_func compare_func);
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78 PyAPI_FUNC(_Py_hashtable_t *) _Py_hashtable_new_full(
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79 size_t data_size,
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80 size_t init_size,
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81 _Py_hashtable_hash_func hash_func,
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82 _Py_hashtable_compare_func compare_func,
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83 _Py_hashtable_copy_data_func copy_data_func,
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84 _Py_hashtable_free_data_func free_data_func,
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85 _Py_hashtable_get_data_size_func get_data_size_func,
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86 _Py_hashtable_allocator_t *allocator);
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87 PyAPI_FUNC(_Py_hashtable_t *) _Py_hashtable_copy(_Py_hashtable_t *src);
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88 PyAPI_FUNC(void) _Py_hashtable_clear(_Py_hashtable_t *ht);
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89 PyAPI_FUNC(void) _Py_hashtable_destroy(_Py_hashtable_t *ht);
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90
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91 typedef int (*_Py_hashtable_foreach_func) (_Py_hashtable_entry_t *entry, void *arg);
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92
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93 PyAPI_FUNC(int) _Py_hashtable_foreach(
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94 _Py_hashtable_t *ht,
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95 _Py_hashtable_foreach_func func, void *arg);
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96 PyAPI_FUNC(size_t) _Py_hashtable_size(_Py_hashtable_t *ht);
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97
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98 PyAPI_FUNC(_Py_hashtable_entry_t*) _Py_hashtable_get_entry(
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99 _Py_hashtable_t *ht,
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100 const void *key);
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101 PyAPI_FUNC(int) _Py_hashtable_set(
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102 _Py_hashtable_t *ht,
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103 const void *key,
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104 void *data,
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105 size_t data_size);
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106 PyAPI_FUNC(int) _Py_hashtable_get(
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107 _Py_hashtable_t *ht,
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108 const void *key,
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109 void *data,
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110 size_t data_size);
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111 PyAPI_FUNC(int) _Py_hashtable_pop(
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112 _Py_hashtable_t *ht,
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113 const void *key,
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114 void *data,
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115 size_t data_size);
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116 PyAPI_FUNC(void) _Py_hashtable_delete(
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117 _Py_hashtable_t *ht,
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118 const void *key);
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119
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120 #define _Py_HASHTABLE_SET(TABLE, KEY, DATA) \
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121 _Py_hashtable_set(TABLE, KEY, &(DATA), sizeof(DATA))
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122
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123 #define _Py_HASHTABLE_GET(TABLE, KEY, DATA) \
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124 _Py_hashtable_get(TABLE, KEY, &(DATA), sizeof(DATA))
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125
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126 #endif /* Py_LIMITED_API */
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127
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128 #endif