Mercurial > cpython-lru_cache-weakref

annotate Modules/_weakref.c @ 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 78ec18f5cb45
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #include "Python.h"
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2
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3
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4 #define GET_WEAKREFS_LISTPTR(o) \
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5 ((PyWeakReference **) PyObject_GET_WEAKREFS_LISTPTR(o))
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6
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7 /*[clinic]
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8 module _weakref
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9 [clinic]*/
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10 /*[clinic checksum: da39a3ee5e6b4b0d3255bfef95601890afd80709]*/
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11
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12 /*[clinic]
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13
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14 _weakref.getweakrefcount -> Py_ssize_t
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15
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16 object: object
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17 /
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18
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19 Return the number of weak references to 'object'.
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20 [clinic]*/
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21
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22 PyDoc_STRVAR(_weakref_getweakrefcount__doc__,
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23 "getweakrefcount(object)\n"
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24 "Return the number of weak references to \'object\'.");
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25
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26 #define _WEAKREF_GETWEAKREFCOUNT_METHODDEF \
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27 {"getweakrefcount", (PyCFunction)_weakref_getweakrefcount, METH_O, _weakref_getweakrefcount__doc__},
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28
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29 static Py_ssize_t
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30 _weakref_getweakrefcount_impl(PyModuleDef *module, PyObject *object);
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31
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32 static PyObject *
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33 _weakref_getweakrefcount(PyModuleDef *module, PyObject *object)
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34 {
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35 PyObject *return_value = NULL;
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36 Py_ssize_t _return_value;
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37 _return_value = _weakref_getweakrefcount_impl(module, object);
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38 if ((_return_value == -1) && PyErr_Occurred())
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39 goto exit;
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40 return_value = PyLong_FromSsize_t(_return_value);
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41
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42 exit:
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43 return return_value;
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44 }
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45
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46 static Py_ssize_t
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47 _weakref_getweakrefcount_impl(PyModuleDef *module, PyObject *object)
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48 /*[clinic checksum: 436e8fbe0297434375f039d8c2d9fc3a9bbe773c]*/
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49 {
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50 PyWeakReference **list;
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51
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52 if (!PyType_SUPPORTS_WEAKREFS(Py_TYPE(object)))
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53 return 0;
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54
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55 list = GET_WEAKREFS_LISTPTR(object);
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56 return _PyWeakref_GetWeakrefCount(*list);
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57 }
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58
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59
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60 PyDoc_STRVAR(weakref_getweakrefs__doc__,
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61 "getweakrefs(object) -- return a list of all weak reference objects\n"
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62 "that point to 'object'.");
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63
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64 static PyObject *
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65 weakref_getweakrefs(PyObject *self, PyObject *object)
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66 {
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67 PyObject *result = NULL;
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68
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69 if (PyType_SUPPORTS_WEAKREFS(Py_TYPE(object))) {
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70 PyWeakReference **list = GET_WEAKREFS_LISTPTR(object);
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71 Py_ssize_t count = _PyWeakref_GetWeakrefCount(*list);
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72
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73 result = PyList_New(count);
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74 if (result != NULL) {
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75 PyWeakReference *current = *list;
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76 Py_ssize_t i;
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77 for (i = 0; i < count; ++i) {
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78 PyList_SET_ITEM(result, i, (PyObject *) current);
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79 Py_INCREF(current);
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80 current = current->wr_next;
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81 }
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82 }
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83 }
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84 else {
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85 result = PyList_New(0);
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86 }
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87 return result;
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88 }
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89
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90
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91 PyDoc_STRVAR(weakref_proxy__doc__,
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92 "proxy(object[, callback]) -- create a proxy object that weakly\n"
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93 "references 'object'. 'callback', if given, is called with a\n"
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94 "reference to the proxy when 'object' is about to be finalized.");
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95
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96 static PyObject *
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97 weakref_proxy(PyObject *self, PyObject *args)
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98 {
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99 PyObject *object;
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100 PyObject *callback = NULL;
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101 PyObject *result = NULL;
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102
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103 if (PyArg_UnpackTuple(args, "proxy", 1, 2, &object, &callback)) {
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104 result = PyWeakref_NewProxy(object, callback);
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105 }
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106 return result;
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107 }
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108
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109
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110 static PyMethodDef
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111 weakref_functions[] = {
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112 _WEAKREF_GETWEAKREFCOUNT_METHODDEF
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113 {"getweakrefs", weakref_getweakrefs, METH_O,
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114 weakref_getweakrefs__doc__},
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115 {"proxy", weakref_proxy, METH_VARARGS,
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116 weakref_proxy__doc__},
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117 {NULL, NULL, 0, NULL}
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118 };
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119
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120
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121 static struct PyModuleDef weakrefmodule = {
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122 PyModuleDef_HEAD_INIT,
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123 "_weakref",
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124 "Weak-reference support module.",
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125 -1,
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126 weakref_functions,
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127 NULL,
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128 NULL,
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129 NULL,
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130 NULL
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131 };
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132
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133 PyMODINIT_FUNC
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134 PyInit__weakref(void)
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135 {
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136 PyObject *m;
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137
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138 m = PyModule_Create(&weakrefmodule);
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139
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140 if (m != NULL) {
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141 Py_INCREF(&_PyWeakref_RefType);
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142 PyModule_AddObject(m, "ref",
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143 (PyObject *) &_PyWeakref_RefType);
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144 Py_INCREF(&_PyWeakref_RefType);
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145 PyModule_AddObject(m, "ReferenceType",
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146 (PyObject *) &_PyWeakref_RefType);
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147 Py_INCREF(&_PyWeakref_ProxyType);
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148 PyModule_AddObject(m, "ProxyType",
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149 (PyObject *) &_PyWeakref_ProxyType);
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150 Py_INCREF(&_PyWeakref_CallableProxyType);
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151 PyModule_AddObject(m, "CallableProxyType",
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152 (PyObject *) &_PyWeakref_CallableProxyType);
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153 }
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154 return m;
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155 }