Mercurial > cpython-lru_cache-weakref
annotate Modules/_sqlite/microprotocols.c @ 87690:66c1c9f32567 default tip
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> |
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| date | Tue, 03 Dec 2013 16:02:48 +0100 |
| parents | 7109f31300fb |
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| rev | line source |
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1 /* microprotocols.c - minimalist and non-validating protocols implementation |
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2 * |
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3 * Copyright (C) 2003-2004 Federico Di Gregorio <fog@debian.org> |
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4 * |
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5 * This file is part of psycopg and was adapted for pysqlite. Federico Di |
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6 * Gregorio gave the permission to use it within pysqlite under the following |
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7 * license: |
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8 * |
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9 * This software is provided 'as-is', without any express or implied |
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10 * warranty. In no event will the authors be held liable for any damages |
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11 * arising from the use of this software. |
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12 * |
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13 * Permission is granted to anyone to use this software for any purpose, |
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14 * including commercial applications, and to alter it and redistribute it |
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15 * freely, subject to the following restrictions: |
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16 * |
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17 * 1. The origin of this software must not be misrepresented; you must not |
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18 * claim that you wrote the original software. If you use this software |
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19 * in a product, an acknowledgment in the product documentation would be |
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20 * appreciated but is not required. |
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21 * 2. Altered source versions must be plainly marked as such, and must not be |
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22 * misrepresented as being the original software. |
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23 * 3. This notice may not be removed or altered from any source distribution. |
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24 */ |
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25 |
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26 #include <Python.h> |
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27 #include <structmember.h> |
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28 |
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29 #include "cursor.h" |
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30 #include "microprotocols.h" |
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31 #include "prepare_protocol.h" |
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32 |
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33 |
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34 /** the adapters registry **/ |
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35 |
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36 PyObject *psyco_adapters; |
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37 |
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38 /* pysqlite_microprotocols_init - initialize the adapters dictionary */ |
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39 |
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40 int |
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41 pysqlite_microprotocols_init(PyObject *dict) |
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42 { |
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43 /* create adapters dictionary and put it in module namespace */ |
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44 if ((psyco_adapters = PyDict_New()) == NULL) { |
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45 return -1; |
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46 } |
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47 |
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48 return PyDict_SetItemString(dict, "adapters", psyco_adapters); |
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49 } |
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50 |
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51 |
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52 /* pysqlite_microprotocols_add - add a reverse type-caster to the dictionary */ |
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53 |
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54 int |
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55 pysqlite_microprotocols_add(PyTypeObject *type, PyObject *proto, PyObject *cast) |
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56 { |
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57 PyObject* key; |
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58 int rc; |
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59 |
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60 if (proto == NULL) proto = (PyObject*)&pysqlite_PrepareProtocolType; |
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61 |
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62 key = Py_BuildValue("(OO)", (PyObject*)type, proto); |
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63 if (!key) { |
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64 return -1; |
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65 } |
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66 |
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67 rc = PyDict_SetItem(psyco_adapters, key, cast); |
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68 Py_DECREF(key); |
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69 |
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70 return rc; |
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71 } |
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72 |
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73 /* pysqlite_microprotocols_adapt - adapt an object to the built-in protocol */ |
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74 |
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75 PyObject * |
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76 pysqlite_microprotocols_adapt(PyObject *obj, PyObject *proto, PyObject *alt) |
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77 { |
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78 PyObject *adapter, *key; |
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79 |
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80 /* we don't check for exact type conformance as specified in PEP 246 |
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81 because the pysqlite_PrepareProtocolType type is abstract and there is no |
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82 way to get a quotable object to be its instance */ |
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83 |
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84 /* look for an adapter in the registry */ |
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85 key = Py_BuildValue("(OO)", (PyObject*)obj->ob_type, proto); |
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86 if (!key) { |
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87 return NULL; |
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88 } |
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89 adapter = PyDict_GetItem(psyco_adapters, key); |
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90 Py_DECREF(key); |
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91 if (adapter) { |
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92 PyObject *adapted = PyObject_CallFunctionObjArgs(adapter, obj, NULL); |
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93 return adapted; |
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94 } |
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95 |
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96 /* try to have the protocol adapt this object*/ |
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97 if (PyObject_HasAttrString(proto, "__adapt__")) { |
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98 _Py_IDENTIFIER(__adapt__); |
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99 PyObject *adapted = _PyObject_CallMethodId(proto, &PyId___adapt__, "O", obj); |
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100 |
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101 if (adapted) { |
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102 if (adapted != Py_None) { |
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103 return adapted; |
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104 } else { |
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105 Py_DECREF(adapted); |
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106 } |
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107 } |
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108 |
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109 if (PyErr_Occurred() && !PyErr_ExceptionMatches(PyExc_TypeError)) |
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110 return NULL; |
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111 } |
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112 |
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113 /* and finally try to have the object adapt itself */ |
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114 if (PyObject_HasAttrString(obj, "__conform__")) { |
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115 _Py_IDENTIFIER(__conform__); |
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116 PyObject *adapted = _PyObject_CallMethodId(obj, &PyId___conform__,"O", proto); |
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117 |
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118 if (adapted) { |
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119 if (adapted != Py_None) { |
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120 return adapted; |
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121 } else { |
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122 Py_DECREF(adapted); |
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123 } |
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124 } |
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125 |
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126 if (PyErr_Occurred() && !PyErr_ExceptionMatches(PyExc_TypeError)) { |
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127 return NULL; |
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128 } |
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129 } |
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130 |
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131 /* else set the right exception and return NULL */ |
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132 PyErr_SetString(pysqlite_ProgrammingError, "can't adapt"); |
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133 return NULL; |
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134 } |
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135 |
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136 /** module-level functions **/ |
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137 |
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138 PyObject * |
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139 pysqlite_adapt(pysqlite_Cursor *self, PyObject *args) |
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140 { |
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141 PyObject *obj, *alt = NULL; |
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142 PyObject *proto = (PyObject*)&pysqlite_PrepareProtocolType; |
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143 |
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144 if (!PyArg_ParseTuple(args, "O|OO", &obj, &proto, &alt)) return NULL; |
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145 return pysqlite_microprotocols_adapt(obj, proto, alt); |
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146 } |
