Mercurial > cpython-lru_cache-weakref

annotate Modules/_weakref.c @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
parents fe2cfce4e658
children
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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
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8 static char weakref_getweakrefcount__doc__[] =
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9 "getweakrefcount(object) -- return the number of weak references\n"
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10 "to 'object'.";
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11
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12 static PyObject *
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13 weakref_getweakrefcount(PyObject *self, PyObject *object)
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14 {
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15 PyObject *result = NULL;
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16
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17 if (PyType_SUPPORTS_WEAKREFS(object->ob_type)) {
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18 PyWeakReference **list = GET_WEAKREFS_LISTPTR(object);
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19
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20 result = PyInt_FromLong(_PyWeakref_GetWeakrefCount(*list));
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21 }
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22 else
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23 result = PyInt_FromLong(0);
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24
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25 return result;
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26 }
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27
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28
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29 static char weakref_getweakrefs__doc__[] =
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30 "getweakrefs(object) -- return a list of all weak reference objects\n"
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31 "that point to 'object'.";
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32
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33 static PyObject *
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34 weakref_getweakrefs(PyObject *self, PyObject *object)
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35 {
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36 PyObject *result = NULL;
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37
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38 if (PyType_SUPPORTS_WEAKREFS(object->ob_type)) {
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39 PyWeakReference **list = GET_WEAKREFS_LISTPTR(object);
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40 long count = _PyWeakref_GetWeakrefCount(*list);
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41
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42 result = PyList_New(count);
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43 if (result != NULL) {
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44 PyWeakReference *current = *list;
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45 long i;
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46 for (i = 0; i < count; ++i) {
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47 PyList_SET_ITEM(result, i, (PyObject *) current);
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48 Py_INCREF(current);
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49 current = current->wr_next;
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50 }
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51 }
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52 }
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53 else {
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54 result = PyList_New(0);
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55 }
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56 return result;
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57 }
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58
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59
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60 static char weakref_ref__doc__[] =
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61 "ref(object[, callback]) -- create a weak reference to 'object';\n"
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62 "when 'object' is finalized, 'callback' will be called and passed\n"
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63 "a reference to the weak reference object when 'object' is about\n"
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64 "to be finalized.";
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65
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66 static PyObject *
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67 weakref_ref(PyObject *self, PyObject *args)
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68 {
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69 PyObject *object;
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70 PyObject *callback = NULL;
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71 PyObject *result = NULL;
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72
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73 if (PyArg_UnpackTuple(args, "ref", 1, 2, &object, &callback)) {
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74 result = PyWeakref_NewRef(object, callback);
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75 }
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76 return result;
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77 }
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78
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79
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80 static char weakref_proxy__doc__[] =
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81 "proxy(object[, callback]) -- create a proxy object that weakly\n"
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82 "references 'object'. 'callback', if given, is called with a\n"
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83 "reference to the proxy when 'object' is about to be finalized.";
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84
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85 static PyObject *
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86 weakref_proxy(PyObject *self, PyObject *args)
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87 {
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88 PyObject *object;
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89 PyObject *callback = NULL;
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90 PyObject *result = NULL;
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91
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92 if (PyArg_UnpackTuple(args, "proxy", 1, 2, &object, &callback)) {
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93 result = PyWeakref_NewProxy(object, callback);
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94 }
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95 return result;
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96 }
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97
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98
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99 static PyMethodDef
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100 weakref_functions[] = {
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101 {"getweakrefcount", weakref_getweakrefcount, METH_O,
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102 weakref_getweakrefcount__doc__},
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103 {"getweakrefs", weakref_getweakrefs, METH_O,
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104 weakref_getweakrefs__doc__},
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105 {"proxy", weakref_proxy, METH_VARARGS,
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106 weakref_proxy__doc__},
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107 {"ref", weakref_ref, METH_VARARGS,
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108 weakref_ref__doc__},
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109 {NULL, NULL, 0, NULL}
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110 };
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111
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112
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113 DL_EXPORT(void)
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114 init_weakref(void)
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115 {
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116 PyObject *m;
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117
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118 m = Py_InitModule3("_weakref", weakref_functions,
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119 "Weak-reference support module.");
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120 if (m != NULL) {
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121 Py_INCREF(&_PyWeakref_RefType);
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122 PyModule_AddObject(m, "ReferenceType",
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123 (PyObject *) &_PyWeakref_RefType);
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124 Py_INCREF(&_PyWeakref_ProxyType);
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125 PyModule_AddObject(m, "ProxyType",
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126 (PyObject *) &_PyWeakref_ProxyType);
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127 Py_INCREF(&_PyWeakref_CallableProxyType);
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128 PyModule_AddObject(m, "CallableProxyType",
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129 (PyObject *) &_PyWeakref_CallableProxyType);
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130 }
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131 }