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annotate Objects/methodobject.c @ 13255:916fb024ce94 legacy-trunk

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Change copyright notice.
author Guido van Rossum <guido@python.org>
date Fri, 30 Jun 2000 23:50:40 +0000
parents 310d7cbba329
children 87ee82e5c56d
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Copyright (c) 2000, BeOpen.com.
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8 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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9 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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10 All rights reserved.
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11
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12 See the file "Misc/COPYRIGHT" for information on usage and
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13 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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14
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15 ******************************************************************/
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16
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17 /* Method object implementation */
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18
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19 #include "Python.h"
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20
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21 #include "token.h"
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22
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23 static PyCFunctionObject *free_list = NULL;
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24
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25 PyObject *
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26 PyCFunction_New(ml, self)
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27 PyMethodDef *ml;
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28 PyObject *self;
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29 {
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30 PyCFunctionObject *op;
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31 op = free_list;
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32 if (op != NULL) {
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33 free_list = (PyCFunctionObject *)(op->m_self);
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34 PyObject_INIT(op, &PyCFunction_Type);
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35 }
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36 else {
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37 op = PyObject_NEW(PyCFunctionObject, &PyCFunction_Type);
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38 if (op == NULL)
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39 return NULL;
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40 }
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41 op->m_ml = ml;
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42 Py_XINCREF(self);
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43 op->m_self = self;
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44 return (PyObject *)op;
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45 }
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46
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47 PyCFunction
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48 PyCFunction_GetFunction(op)
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49 PyObject *op;
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50 {
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51 if (!PyCFunction_Check(op)) {
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52 PyErr_BadInternalCall();
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53 return NULL;
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54 }
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55 return ((PyCFunctionObject *)op) -> m_ml -> ml_meth;
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56 }
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57
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58 PyObject *
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59 PyCFunction_GetSelf(op)
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60 PyObject *op;
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61 {
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62 if (!PyCFunction_Check(op)) {
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63 PyErr_BadInternalCall();
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64 return NULL;
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65 }
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66 return ((PyCFunctionObject *)op) -> m_self;
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67 }
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68
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69 int
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70 PyCFunction_GetFlags(op)
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71 PyObject *op;
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72 {
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73 if (!PyCFunction_Check(op)) {
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74 PyErr_BadInternalCall();
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75 return -1;
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76 }
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77 return ((PyCFunctionObject *)op) -> m_ml -> ml_flags;
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78 }
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79
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80 /* Methods (the standard built-in methods, that is) */
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81
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82 static void
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83 meth_dealloc(m)
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84 PyCFunctionObject *m;
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85 {
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86 Py_XDECREF(m->m_self);
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87 m->m_self = (PyObject *)free_list;
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88 free_list = m;
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89 }
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90
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91 static PyObject *
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92 meth_getattr(m, name)
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93 PyCFunctionObject *m;
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94 char *name;
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95 {
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96 if (strcmp(name, "__name__") == 0) {
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97 return PyString_FromString(m->m_ml->ml_name);
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98 }
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99 if (strcmp(name, "__doc__") == 0) {
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100 char *doc = m->m_ml->ml_doc;
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101 if (doc != NULL)
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102 return PyString_FromString(doc);
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103 Py_INCREF(Py_None);
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104 return Py_None;
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105 }
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106 if (strcmp(name, "__self__") == 0) {
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107 PyObject *self;
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108 if (PyEval_GetRestricted()) {
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109 PyErr_SetString(PyExc_RuntimeError,
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110 "method.__self__ not accessible in restricted mode");
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111 return NULL;
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112 }
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113 self = m->m_self;
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114 if (self == NULL)
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115 self = Py_None;
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116 Py_INCREF(self);
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117 return self;
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118 }
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119 if (strcmp(name, "__members__") == 0) {
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120 return Py_BuildValue("[sss]",
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121 "__doc__", "__name__", "__self__");
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122 }
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123 PyErr_SetString(PyExc_AttributeError, name);
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124 return NULL;
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125 }
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126
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127 static PyObject *
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128 meth_repr(m)
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129 PyCFunctionObject *m;
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130 {
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131 char buf[200];
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132 if (m->m_self == NULL)
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133 sprintf(buf, "<built-in function %.80s>", m->m_ml->ml_name);
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134 else
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135 sprintf(buf,
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136 "<built-in method %.80s of %.80s object at %p>",
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137 m->m_ml->ml_name, m->m_self->ob_type->tp_name,
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138 m->m_self);
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139 return PyString_FromString(buf);
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140 }
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141
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142 static int
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143 meth_compare(a, b)
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144 PyCFunctionObject *a, *b;
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145 {
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146 if (a->m_self != b->m_self)
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147 return (a->m_self < b->m_self) ? -1 : 1;
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148 if (a->m_ml->ml_meth == b->m_ml->ml_meth)
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149 return 0;
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150 if (strcmp(a->m_ml->ml_name, b->m_ml->ml_name) < 0)
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151 return -1;
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152 else
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153 return 1;
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154 }
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155
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156 static long
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157 meth_hash(a)
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158 PyCFunctionObject *a;
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159 {
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160 long x,y;
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161 if (a->m_self == NULL)
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162 x = 0;
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163 else {
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164 x = PyObject_Hash(a->m_self);
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165 if (x == -1)
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166 return -1;
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167 }
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168 y = _Py_HashPointer((void*)(a->m_ml->ml_meth));
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169 if (y == -1)
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170 return -1;
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171 x ^= y;
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172 if (x == -1)
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173 x = -2;
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174 return x;
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175 }
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176
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177 PyTypeObject PyCFunction_Type = {
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178 PyObject_HEAD_INIT(&PyType_Type)
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179 0,
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180 "builtin_function_or_method",
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181 sizeof(PyCFunctionObject),
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182 0,
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183 (destructor)meth_dealloc, /*tp_dealloc*/
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184 0, /*tp_print*/
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185 (getattrfunc)meth_getattr, /*tp_getattr*/
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186 0, /*tp_setattr*/
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187 (cmpfunc)meth_compare, /*tp_compare*/
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188 (reprfunc)meth_repr, /*tp_repr*/
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189 0, /*tp_as_number*/
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190 0, /*tp_as_sequence*/
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191 0, /*tp_as_mapping*/
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192 (hashfunc)meth_hash, /*tp_hash*/
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193 };
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194
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195 /* List all methods in a chain -- helper for findmethodinchain */
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196
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197 static PyObject *
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198 listmethodchain(chain)
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199 PyMethodChain *chain;
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200 {
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201 PyMethodChain *c;
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202 PyMethodDef *ml;
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203 int i, n;
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204 PyObject *v;
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205
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206 n = 0;
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207 for (c = chain; c != NULL; c = c->link) {
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208 for (ml = c->methods; ml->ml_name != NULL; ml++)
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209 n++;
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210 }
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211 v = PyList_New(n);
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212 if (v == NULL)
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213 return NULL;
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214 i = 0;
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215 for (c = chain; c != NULL; c = c->link) {
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216 for (ml = c->methods; ml->ml_name != NULL; ml++) {
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217 PyList_SetItem(v, i, PyString_FromString(ml->ml_name));
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218 i++;
395
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219 }
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220 }
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221 if (PyErr_Occurred()) {
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222 Py_DECREF(v);
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223 return NULL;
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224 }
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225 PyList_Sort(v);
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226 return v;
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227 }
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228
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229 /* Find a method in a method chain */
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230
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231 PyObject *
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232 Py_FindMethodInChain(chain, self, name)
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233 PyMethodChain *chain;
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234 PyObject *self;
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235 char *name;
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236 {
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237 if (name[0] == '_' && name[1] == '_') {
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238 if (strcmp(name, "__methods__") == 0)
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239 return listmethodchain(chain);
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240 if (strcmp(name, "__doc__") == 0) {
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241 char *doc = self->ob_type->tp_doc;
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242 if (doc != NULL)
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243 return PyString_FromString(doc);
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244 }
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245 }
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246 while (chain != NULL) {
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247 PyMethodDef *ml = chain->methods;
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248 for (; ml->ml_name != NULL; ml++) {
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249 if (name[0] == ml->ml_name[0] &&
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250 strcmp(name+1, ml->ml_name+1) == 0)
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251 return PyCFunction_New(ml, self);
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252 }
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253 chain = chain->link;
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254 }
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255 PyErr_SetString(PyExc_AttributeError, name);
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256 return NULL;
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257 }
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258
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259 /* Find a method in a single method list */
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260
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261 PyObject *
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262 Py_FindMethod(methods, self, name)
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263 PyMethodDef *methods;
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264 PyObject *self;
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265 char *name;
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266 {
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267 PyMethodChain chain;
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268 chain.methods = methods;
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269 chain.link = NULL;
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270 return Py_FindMethodInChain(&chain, self, name);
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271 }
5934
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272
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273 /* Clear out the free list */
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274
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275 void
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276 PyCFunction_Fini()
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277 {
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278 while (free_list) {
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279 PyCFunctionObject *v = free_list;
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280 free_list = (PyCFunctionObject *)(v->m_self);
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281 PyObject_DEL(v);
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282 }
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283 }