Mercurial > cpython-lru_cache-weakref

annotate Objects/classobject.c @ 73798:6cde416ef03b

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Credit Per Øyvind Karlsen for the initial implementation of the lzma module (issue #6715).
author Nadeem Vawda <nadeem.vawda@gmail.com>
date Thu, 01 Dec 2011 01:18:27 +0200
parents 7109f31300fb
children d63a80abfbec
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rev   line source
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8f5b9982beba Completely get rid of PyClass and PyInstance.
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1 /* Class object implementation (dead now except for methods) */
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2
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3 #include "Python.h"
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4 #include "structmember.h"
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5
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6 #define TP_DESCR_GET(t) ((t)->tp_descr_get)
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733cb268ad2f Protect references to tp_descr_get and tp_dict with the appropriate test:
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7
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8 /* Free list for method objects to safe malloc/free overhead
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9 * The im_self element is used to chain the elements.
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10 */
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11 static PyMethodObject *free_list;
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12 static int numfree = 0;
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13 #ifndef PyMethod_MAXFREELIST
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14 #define PyMethod_MAXFREELIST 256
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15 #endif
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16
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17 _Py_IDENTIFIER(__name__);
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18
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19 PyObject *
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20 PyMethod_Function(PyObject *im)
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21 {
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22 if (!PyMethod_Check(im)) {
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23 PyErr_BadInternalCall();
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24 return NULL;
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25 }
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26 return ((PyMethodObject *)im)->im_func;
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27 }
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28
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29 PyObject *
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30 PyMethod_Self(PyObject *im)
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31 {
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32 if (!PyMethod_Check(im)) {
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33 PyErr_BadInternalCall();
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34 return NULL;
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35 }
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36 return ((PyMethodObject *)im)->im_self;
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37 }
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38
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39 /* Method objects are used for bound instance methods returned by
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40 instancename.methodname. ClassName.methodname returns an ordinary
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41 function.
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42 */
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43
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44 PyObject *
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45 PyMethod_New(PyObject *func, PyObject *self)
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46 {
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47 register PyMethodObject *im;
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48 if (self == NULL) {
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49 PyErr_BadInternalCall();
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50 return NULL;
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51 }
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52 im = free_list;
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53 if (im != NULL) {
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54 free_list = (PyMethodObject *)(im->im_self);
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55 PyObject_INIT(im, &PyMethod_Type);
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56 numfree--;
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57 }
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58 else {
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59 im = PyObject_GC_New(PyMethodObject, &PyMethod_Type);
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60 if (im == NULL)
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61 return NULL;
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62 }
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63 im->im_weakreflist = NULL;
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64 Py_INCREF(func);
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65 im->im_func = func;
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66 Py_XINCREF(self);
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67 im->im_self = self;
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68 _PyObject_GC_TRACK(im);
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69 return (PyObject *)im;
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70 }
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71
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72 /* Descriptors for PyMethod attributes */
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73
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74 /* im_func and im_self are stored in the PyMethod object */
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75
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76 #define MO_OFF(x) offsetof(PyMethodObject, x)
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78 static PyMemberDef method_memberlist[] = {
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79 {"__func__", T_OBJECT, MO_OFF(im_func), READONLY|RESTRICTED,
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80 "the function (or other callable) implementing a method"},
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81 {"__self__", T_OBJECT, MO_OFF(im_self), READONLY|RESTRICTED,
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82 "the instance to which a method is bound"},
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83 {NULL} /* Sentinel */
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84 };
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85
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86 /* Christian Tismer argued convincingly that method attributes should
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87 (nearly) always override function attributes.
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88 The one exception is __doc__; there's a default __doc__ which
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89 should only be used for the class, not for instances */
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90
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91 static PyObject *
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92 method_get_doc(PyMethodObject *im, void *context)
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93 {
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94 static PyObject *docstr;
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95 if (docstr == NULL) {
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96 docstr= PyUnicode_InternFromString("__doc__");
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97 if (docstr == NULL)
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98 return NULL;
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99 }
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100 return PyObject_GetAttr(im->im_func, docstr);
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101 }
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102
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103 static PyGetSetDef method_getset[] = {
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104 {"__doc__", (getter)method_get_doc, NULL, NULL},
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105 {0}
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106 };
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107
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108 static PyObject *
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109 method_getattro(PyObject *obj, PyObject *name)
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110 {
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111 PyMethodObject *im = (PyMethodObject *)obj;
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112 PyTypeObject *tp = obj->ob_type;
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113 PyObject *descr = NULL;
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114
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115 {
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116 if (tp->tp_dict == NULL) {
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117 if (PyType_Ready(tp) < 0)
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118 return NULL;
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119 }
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120 descr = _PyType_Lookup(tp, name);
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121 }
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122
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123 if (descr != NULL) {
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124 descrgetfunc f = TP_DESCR_GET(descr->ob_type);
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125 if (f != NULL)
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126 return f(descr, obj, (PyObject *)obj->ob_type);
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127 else {
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128 Py_INCREF(descr);
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129 return descr;
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130 }
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131 }
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132
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133 return PyObject_GetAttr(im->im_func, name);
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134 }
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135
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136 PyDoc_STRVAR(method_doc,
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137 "method(function, instance)\n\
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138 \n\
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139 Create a bound instance method object.");
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140
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141 static PyObject *
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142 method_new(PyTypeObject* type, PyObject* args, PyObject *kw)
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143 {
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144 PyObject *func;
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145 PyObject *self;
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146
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147 if (!_PyArg_NoKeywords("method", kw))
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148 return NULL;
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149 if (!PyArg_UnpackTuple(args, "method", 2, 2,
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150 &func, &self))
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151 return NULL;
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152 if (!PyCallable_Check(func)) {
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153 PyErr_SetString(PyExc_TypeError,
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154 "first argument must be callable");
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155 return NULL;
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156 }
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157 if (self == NULL || self == Py_None) {
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158 PyErr_SetString(PyExc_TypeError,
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159 "self must not be None");
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160 return NULL;
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161 }
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162
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163 return PyMethod_New(func, self);
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164 }
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165
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166 static void
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167 method_dealloc(register PyMethodObject *im)
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168 {
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169 _PyObject_GC_UNTRACK(im);
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170 if (im->im_weakreflist != NULL)
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171 PyObject_ClearWeakRefs((PyObject *)im);
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172 Py_DECREF(im->im_func);
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173 Py_XDECREF(im->im_self);
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174 if (numfree < PyMethod_MAXFREELIST) {
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175 im->im_self = (PyObject *)free_list;
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176 free_list = im;
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177 numfree++;
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178 }
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179 else {
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180 PyObject_GC_Del(im);
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181 }
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182 }
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183
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184 static PyObject *
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185 method_richcompare(PyObject *self, PyObject *other, int op)
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186 {
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187 PyMethodObject *a, *b;
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188 PyObject *res;
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189 int eq;
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190
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191 if ((op != Py_EQ && op != Py_NE) ||
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192 !PyMethod_Check(self) ||
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193 !PyMethod_Check(other))
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194 {
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195 Py_RETURN_NOTIMPLEMENTED;
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196 }
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197 a = (PyMethodObject *)self;
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198 b = (PyMethodObject *)other;
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199 eq = PyObject_RichCompareBool(a->im_func, b->im_func, Py_EQ);
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200 if (eq == 1) {
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201 if (a->im_self == NULL || b->im_self == NULL)
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202 eq = a->im_self == b->im_self;
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203 else
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204 eq = PyObject_RichCompareBool(a->im_self, b->im_self,
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205 Py_EQ);
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206 }
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207 if (eq < 0)
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208 return NULL;
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209 if (op == Py_EQ)
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210 res = eq ? Py_True : Py_False;
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211 else
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212 res = eq ? Py_False : Py_True;
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213 Py_INCREF(res);
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214 return res;
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215 }
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216
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217 static PyObject *
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218 method_repr(PyMethodObject *a)
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219 {
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220 PyObject *self = a->im_self;
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221 PyObject *func = a->im_func;
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222 PyObject *klass = (PyObject*)Py_TYPE(self);
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223 PyObject *funcname = NULL ,*klassname = NULL, *result = NULL;
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224 char *defname = "?";
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225
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226 if (self == NULL) {
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227 PyErr_BadInternalCall();
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228 return NULL;
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229 }
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230
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231 funcname = _PyObject_GetAttrId(func, &PyId___name__);
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232 if (funcname == NULL) {
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233 if (!PyErr_ExceptionMatches(PyExc_AttributeError))
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234 return NULL;
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235 PyErr_Clear();
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236 }
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237 else if (!PyUnicode_Check(funcname)) {
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238 Py_DECREF(funcname);
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239 funcname = NULL;
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240 }
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241
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242 if (klass == NULL)
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243 klassname = NULL;
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244 else {
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245 klassname = _PyObject_GetAttrId(klass, &PyId___name__);
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246 if (klassname == NULL) {
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247 if (!PyErr_ExceptionMatches(PyExc_AttributeError))
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248 return NULL;
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249 PyErr_Clear();
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250 }
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251 else if (!PyUnicode_Check(klassname)) {
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252 Py_DECREF(klassname);
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253 klassname = NULL;
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254 }
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255 }
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256
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257 /* XXX Shouldn't use repr()/%R here! */
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258 result = PyUnicode_FromFormat("<bound method %V.%V of %R>",
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259 klassname, defname,
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260 funcname, defname, self);
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261
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262 Py_XDECREF(funcname);
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263 Py_XDECREF(klassname);
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264 return result;
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265 }
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266
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267 static Py_hash_t
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268 method_hash(PyMethodObject *a)
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269 {
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270 Py_hash_t x, y;
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271 if (a->im_self == NULL)
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272 x = PyObject_Hash(Py_None);
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273 else
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274 x = PyObject_Hash(a->im_self);
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275 if (x == -1)
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276 return -1;
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277 y = PyObject_Hash(a->im_func);
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278 if (y == -1)
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279 return -1;
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280 x = x ^ y;
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281 if (x == -1)
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282 x = -2;
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283 return x;
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284 }
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285
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286 static int
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287 method_traverse(PyMethodObject *im, visitproc visit, void *arg)
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288 {
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289 Py_VISIT(im->im_func);
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290 Py_VISIT(im->im_self);
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291 return 0;
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292 }
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293
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294 static PyObject *
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295 method_call(PyObject *func, PyObject *arg, PyObject *kw)
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296 {
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297 PyObject *self = PyMethod_GET_SELF(func);
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298 PyObject *result;
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299
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300 func = PyMethod_GET_FUNCTION(func);
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301 if (self == NULL) {
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302 PyErr_BadInternalCall();
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303 return NULL;
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304 }
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305 else {
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306 Py_ssize_t argcount = PyTuple_Size(arg);
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307 PyObject *newarg = PyTuple_New(argcount + 1);
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308 int i;
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309 if (newarg == NULL)
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310 return NULL;
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311 Py_INCREF(self);
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312 PyTuple_SET_ITEM(newarg, 0, self);
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313 for (i = 0; i < argcount; i++) {
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314 PyObject *v = PyTuple_GET_ITEM(arg, i);
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315 Py_XINCREF(v);
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316 PyTuple_SET_ITEM(newarg, i+1, v);
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317 }
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318 arg = newarg;
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319 }
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320 result = PyObject_Call((PyObject *)func, arg, kw);
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321 Py_DECREF(arg);
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322 return result;
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323 }
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324
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325 static PyObject *
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326 method_descr_get(PyObject *meth, PyObject *obj, PyObject *cls)
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327 {
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328 /* Don't rebind an already bound method of a class that's not a base
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329 class of cls. */
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330 if (PyMethod_GET_SELF(meth) != NULL) {
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331 /* Already bound */
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332 Py_INCREF(meth);
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333 return meth;
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334 }
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335 /* Bind it to obj */
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336 return PyMethod_New(PyMethod_GET_FUNCTION(meth), obj);
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337 }
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338
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339 PyTypeObject PyMethod_Type = {
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340 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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341 "method",
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342 sizeof(PyMethodObject),
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343 0,
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344 (destructor)method_dealloc, /* tp_dealloc */
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345 0, /* tp_print */
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346 0, /* tp_getattr */
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347 0, /* tp_setattr */
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348 0, /* tp_reserved */
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349 (reprfunc)method_repr, /* tp_repr */
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350 0, /* tp_as_number */
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351 0, /* tp_as_sequence */
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352 0, /* tp_as_mapping */
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353 (hashfunc)method_hash, /* tp_hash */
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354 method_call, /* tp_call */
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355 0, /* tp_str */
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356 method_getattro, /* tp_getattro */
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357 PyObject_GenericSetAttr, /* tp_setattro */
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358 0, /* tp_as_buffer */
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359 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
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360 method_doc, /* tp_doc */
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361 (traverseproc)method_traverse, /* tp_traverse */
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362 0, /* tp_clear */
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363 method_richcompare, /* tp_richcompare */
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364 offsetof(PyMethodObject, im_weakreflist), /* tp_weaklistoffset */
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365 0, /* tp_iter */
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366 0, /* tp_iternext */
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367 0, /* tp_methods */
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368 method_memberlist, /* tp_members */
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369 method_getset, /* tp_getset */
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370 0, /* tp_base */
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371 0, /* tp_dict */
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372 method_descr_get, /* tp_descr_get */
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373 0, /* tp_descr_set */
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374 0, /* tp_dictoffset */
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375 0, /* tp_init */
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376 0, /* tp_alloc */
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377 method_new, /* tp_new */
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378 };
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379
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380 /* Clear out the free list */
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381
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382 int
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383 PyMethod_ClearFreeList(void)
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384 {
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385 int freelist_size = numfree;
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386
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387 while (free_list) {
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388 PyMethodObject *im = free_list;
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389 free_list = (PyMethodObject *)(im->im_self);
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390 PyObject_GC_Del(im);
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391 numfree--;
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392 }
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393 assert(numfree == 0);
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394 return freelist_size;
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395 }
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396
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397 void
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398 PyMethod_Fini(void)
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399 {
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400 (void)PyMethod_ClearFreeList();
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401 }
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402
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403 /* ------------------------------------------------------------------------
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404 * instance method
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405 */
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406
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407 PyObject *
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408 PyInstanceMethod_New(PyObject *func) {
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409 PyInstanceMethodObject *method;
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410 method = PyObject_GC_New(PyInstanceMethodObject,
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411 &PyInstanceMethod_Type);
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412 if (method == NULL) return NULL;
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413 Py_INCREF(func);
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414 method->func = func;
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415 _PyObject_GC_TRACK(method);
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416 return (PyObject *)method;
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417 }
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418
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419 PyObject *
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420 PyInstanceMethod_Function(PyObject *im)
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421 {
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422 if (!PyInstanceMethod_Check(im)) {
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423 PyErr_BadInternalCall();
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424 return NULL;
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425 }
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426 return PyInstanceMethod_GET_FUNCTION(im);
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427 }
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428
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429 #define IMO_OFF(x) offsetof(PyInstanceMethodObject, x)
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430
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431 static PyMemberDef instancemethod_memberlist[] = {
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432 {"__func__", T_OBJECT, IMO_OFF(func), READONLY|RESTRICTED,
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433 "the function (or other callable) implementing a method"},
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434 {NULL} /* Sentinel */
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435 };
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436
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437 static PyObject *
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438 instancemethod_get_doc(PyObject *self, void *context)
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439 {
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440 static PyObject *docstr;
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441 if (docstr == NULL) {
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442 docstr = PyUnicode_InternFromString("__doc__");
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443 if (docstr == NULL)
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444 return NULL;
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445 }
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446 return PyObject_GetAttr(PyInstanceMethod_GET_FUNCTION(self), docstr);
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447 }
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448
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449 static PyGetSetDef instancemethod_getset[] = {
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450 {"__doc__", (getter)instancemethod_get_doc, NULL, NULL},
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451 {0}
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452 };
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453
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454 static PyObject *
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455 instancemethod_getattro(PyObject *self, PyObject *name)
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456 {
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457 PyTypeObject *tp = self->ob_type;
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458 PyObject *descr = NULL;
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459
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460 if (tp->tp_dict == NULL) {
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461 if (PyType_Ready(tp) < 0)
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462 return NULL;
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463 }
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464 descr = _PyType_Lookup(tp, name);
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465
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466 if (descr != NULL) {
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467 descrgetfunc f = TP_DESCR_GET(descr->ob_type);
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468 if (f != NULL)
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469 return f(descr, self, (PyObject *)self->ob_type);
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470 else {
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471 Py_INCREF(descr);
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472 return descr;
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473 }
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474 }
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475
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476 return PyObject_GetAttr(PyInstanceMethod_GET_FUNCTION(self), name);
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477 }
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478
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479 static void
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480 instancemethod_dealloc(PyObject *self) {
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481 _PyObject_GC_UNTRACK(self);
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482 Py_DECREF(PyInstanceMethod_GET_FUNCTION(self));
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483 PyObject_GC_Del(self);
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484 }
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485
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486 static int
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487 instancemethod_traverse(PyObject *self, visitproc visit, void *arg) {
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488 Py_VISIT(PyInstanceMethod_GET_FUNCTION(self));
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489 return 0;
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490 }
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491
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492 static PyObject *
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493 instancemethod_call(PyObject *self, PyObject *arg, PyObject *kw)
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494 {
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495 return PyObject_Call(PyMethod_GET_FUNCTION(self), arg, kw);
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496 }
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497
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498 static PyObject *
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499 instancemethod_descr_get(PyObject *descr, PyObject *obj, PyObject *type) {
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500 register PyObject *func = PyInstanceMethod_GET_FUNCTION(descr);
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501 if (obj == NULL) {
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502 Py_INCREF(func);
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503 return func;
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504 }
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505 else
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506 return PyMethod_New(func, obj);
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507 }
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508
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509 static PyObject *
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510 instancemethod_richcompare(PyObject *self, PyObject *other, int op)
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511 {
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512 PyInstanceMethodObject *a, *b;
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513 PyObject *res;
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514 int eq;
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515
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516 if ((op != Py_EQ && op != Py_NE) ||
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517 !PyInstanceMethod_Check(self) ||
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518 !PyInstanceMethod_Check(other))
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519 {
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520 Py_RETURN_NOTIMPLEMENTED;
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521 }
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522 a = (PyInstanceMethodObject *)self;
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523 b = (PyInstanceMethodObject *)other;
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524 eq = PyObject_RichCompareBool(a->func, b->func, Py_EQ);
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525 if (eq < 0)
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526 return NULL;
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527 if (op == Py_EQ)
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528 res = eq ? Py_True : Py_False;
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529 else
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530 res = eq ? Py_False : Py_True;
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531 Py_INCREF(res);
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532 return res;
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533 }
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534
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535 static PyObject *
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536 instancemethod_repr(PyObject *self)
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537 {
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538 PyObject *func = PyInstanceMethod_Function(self);
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539 PyObject *funcname = NULL , *result = NULL;
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540 char *defname = "?";
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541
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542 if (func == NULL) {
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543 PyErr_BadInternalCall();
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544 return NULL;
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545 }
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546
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547 funcname = _PyObject_GetAttrId(func, &PyId___name__);
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548 if (funcname == NULL) {
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549 if (!PyErr_ExceptionMatches(PyExc_AttributeError))
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550 return NULL;
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551 PyErr_Clear();
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552 }
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553 else if (!PyUnicode_Check(funcname)) {
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554 Py_DECREF(funcname);
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555 funcname = NULL;
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556 }
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557
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558 result = PyUnicode_FromFormat("<instancemethod %V at %p>",
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559 funcname, defname, self);
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560
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561 Py_XDECREF(funcname);
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562 return result;
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563 }
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564
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565 /*
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566 static long
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567 instancemethod_hash(PyObject *self)
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568 {
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569 long x, y;
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570 x = (long)self;
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571 y = PyObject_Hash(PyInstanceMethod_GET_FUNCTION(self));
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572 if (y == -1)
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573 return -1;
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574 x = x ^ y;
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575 if (x == -1)
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576 x = -2;
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577 return x;
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578 }
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579 */
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580
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581 PyDoc_STRVAR(instancemethod_doc,
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582 "instancemethod(function)\n\
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583 \n\
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584 Bind a function to a class.");
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585
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586 static PyObject *
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587 instancemethod_new(PyTypeObject* type, PyObject* args, PyObject *kw)
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588 {
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589 PyObject *func;
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590
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591 if (!_PyArg_NoKeywords("instancemethod", kw))
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592 return NULL;
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593 if (!PyArg_UnpackTuple(args, "instancemethod", 1, 1, &func))
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594 return NULL;
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595 if (!PyCallable_Check(func)) {
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596 PyErr_SetString(PyExc_TypeError,
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597 "first argument must be callable");
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598 return NULL;
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599 }
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600
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601 return PyInstanceMethod_New(func);
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602 }
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603
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604 PyTypeObject PyInstanceMethod_Type = {
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605 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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606 "instancemethod", /* tp_name */
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607 sizeof(PyInstanceMethodObject), /* tp_basicsize */
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608 0, /* tp_itemsize */
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609 instancemethod_dealloc, /* tp_dealloc */
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610 0, /* tp_print */
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611 0, /* tp_getattr */
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612 0, /* tp_setattr */
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613 0, /* tp_reserved */
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614 (reprfunc)instancemethod_repr, /* tp_repr */
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615 0, /* tp_as_number */
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616 0, /* tp_as_sequence */
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617 0, /* tp_as_mapping */
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618 0, /*(hashfunc)instancemethod_hash, tp_hash */
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619 instancemethod_call, /* tp_call */
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620 0, /* tp_str */
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621 instancemethod_getattro, /* tp_getattro */
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622 PyObject_GenericSetAttr, /* tp_setattro */
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623 0, /* tp_as_buffer */
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624 Py_TPFLAGS_DEFAULT
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625 | Py_TPFLAGS_HAVE_GC, /* tp_flags */
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626 instancemethod_doc, /* tp_doc */
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627 instancemethod_traverse, /* tp_traverse */
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628 0, /* tp_clear */
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629 instancemethod_richcompare, /* tp_richcompare */
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630 0, /* tp_weaklistoffset */
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631 0, /* tp_iter */
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632 0, /* tp_iternext */
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633 0, /* tp_methods */
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634 instancemethod_memberlist, /* tp_members */
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635 instancemethod_getset, /* tp_getset */
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636 0, /* tp_base */
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637 0, /* tp_dict */
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638 instancemethod_descr_get, /* tp_descr_get */
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639 0, /* tp_descr_set */
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640 0, /* tp_dictoffset */
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641 0, /* tp_init */
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642 0, /* tp_alloc */
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643 instancemethod_new, /* tp_new */
44272
3e0867a07765 Issue #1587: Added instancemethod wrapper for PyCFunctions. The Python C API
Christian Heimes <christian@cheimes.de>
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644 };