Mercurial > cpython-lru_cache-weakref

annotate Objects/methodobject.c @ 19161:d64e059cd199 legacy-trunk

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Add section on PEP 238 changes Minor grammatical changes, reformattings, and an error fix from Keith Briggs
author Andrew M. Kuchling <amk@amk.ca>
date Sat, 11 Aug 2001 03:06:50 +0000
parents 09df3254b49d
children 3c1c9948ff65
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1
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2 /* Method object implementation */
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3
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4 #include "Python.h"
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5
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6 static PyCFunctionObject *free_list = NULL;
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7
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8 PyObject *
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9 PyCFunction_New(PyMethodDef *ml, PyObject *self)
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10 {
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11 PyCFunctionObject *op;
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12 op = free_list;
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13 if (op != NULL) {
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14 free_list = (PyCFunctionObject *)(op->m_self);
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15 PyObject_INIT(op, &PyCFunction_Type);
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16 }
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17 else {
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18 op = PyObject_NEW(PyCFunctionObject, &PyCFunction_Type);
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19 if (op == NULL)
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20 return NULL;
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21 }
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22 op->m_ml = ml;
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23 Py_XINCREF(self);
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24 op->m_self = self;
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25 PyObject_GC_Init(op);
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26 return (PyObject *)op;
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27 }
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28
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29 PyCFunction
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30 PyCFunction_GetFunction(PyObject *op)
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31 {
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32 if (!PyCFunction_Check(op)) {
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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 ((PyCFunctionObject *)op) -> m_ml -> ml_meth;
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37 }
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38
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39 PyObject *
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40 PyCFunction_GetSelf(PyObject *op)
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41 {
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42 if (!PyCFunction_Check(op)) {
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43 PyErr_BadInternalCall();
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44 return NULL;
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45 }
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46 return ((PyCFunctionObject *)op) -> m_self;
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47 }
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48
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49 int
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50 PyCFunction_GetFlags(PyObject *op)
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51 {
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52 if (!PyCFunction_Check(op)) {
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53 PyErr_BadInternalCall();
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54 return -1;
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55 }
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56 return ((PyCFunctionObject *)op) -> m_ml -> ml_flags;
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57 }
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58
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59 /* Methods (the standard built-in methods, that is) */
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60
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61 static void
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62 meth_dealloc(PyCFunctionObject *m)
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63 {
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64 PyObject_GC_Fini(m);
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65 Py_XDECREF(m->m_self);
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66 m->m_self = (PyObject *)free_list;
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67 free_list = m;
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68 }
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69
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70 static PyObject *
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71 meth_get__doc__(PyCFunctionObject *m, void *closure)
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72 {
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73 char *doc = m->m_ml->ml_doc;
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74
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75 if (doc != NULL)
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76 return PyString_FromString(doc);
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77 Py_INCREF(Py_None);
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78 return Py_None;
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79 }
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80
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81 static PyObject *
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82 meth_get__name__(PyCFunctionObject *m, void *closure)
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83 {
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84 return PyString_FromString(m->m_ml->ml_name);
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85 }
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86
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87 static int
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88 meth_traverse(PyCFunctionObject *m, visitproc visit, void *arg)
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89 {
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90 if (m->m_self != NULL)
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91 return visit(m->m_self, arg);
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92 else
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93 return 0;
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94 }
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95
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96 static PyObject *
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97 meth_get__self__(PyCFunctionObject *m, void *closure)
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98 {
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99 PyObject *self;
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100 if (PyEval_GetRestricted()) {
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101 PyErr_SetString(PyExc_RuntimeError,
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102 "method.__self__ not accessible in restricted mode");
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103 return NULL;
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104 }
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105 self = m->m_self;
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106 if (self == NULL)
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107 self = Py_None;
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108 Py_INCREF(self);
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109 return self;
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110 }
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111
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112 static struct getsetlist meth_getsets [] = {
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113 {"__doc__", (getter)meth_get__doc__, NULL, NULL},
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114 {"__name__", (getter)meth_get__name__, NULL, NULL},
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115 {"__self__", (getter)meth_get__self__, NULL, NULL},
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116 {0}
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117 };
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118
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119 static PyObject *
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120 meth_repr(PyCFunctionObject *m)
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121 {
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122 char buf[200];
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123 if (m->m_self == NULL)
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124 sprintf(buf, "<built-in function %.80s>", m->m_ml->ml_name);
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125 else
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126 sprintf(buf,
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127 "<built-in method %.80s of %.80s object at %p>",
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128 m->m_ml->ml_name, m->m_self->ob_type->tp_name,
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129 m->m_self);
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130 return PyString_FromString(buf);
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131 }
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132
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133 static int
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134 meth_compare(PyCFunctionObject *a, PyCFunctionObject *b)
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135 {
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136 if (a->m_self != b->m_self)
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137 return (a->m_self < b->m_self) ? -1 : 1;
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138 if (a->m_ml->ml_meth == b->m_ml->ml_meth)
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139 return 0;
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140 if (strcmp(a->m_ml->ml_name, b->m_ml->ml_name) < 0)
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141 return -1;
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142 else
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143 return 1;
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144 }
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145
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146 static long
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147 meth_hash(PyCFunctionObject *a)
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148 {
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149 long x,y;
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150 if (a->m_self == NULL)
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151 x = 0;
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152 else {
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153 x = PyObject_Hash(a->m_self);
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154 if (x == -1)
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155 return -1;
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156 }
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157 y = _Py_HashPointer((void*)(a->m_ml->ml_meth));
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158 if (y == -1)
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159 return -1;
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160 x ^= y;
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161 if (x == -1)
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162 x = -2;
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163 return x;
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164 }
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165
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166 static PyObject *
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167 meth_call(PyObject *func, PyObject *arg, PyObject *kw)
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168 {
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169 PyCFunctionObject* f = (PyCFunctionObject*)func;
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170 PyCFunction meth = PyCFunction_GET_FUNCTION(func);
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171 PyObject *self = PyCFunction_GET_SELF(func);
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172 int flags = PyCFunction_GET_FLAGS(func);
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173
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174 if (flags & METH_KEYWORDS) {
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175 return (*(PyCFunctionWithKeywords)meth)(self, arg, kw);
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176 }
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177 if (kw != NULL && PyDict_Size(kw) != 0) {
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178 PyErr_Format(PyExc_TypeError,
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179 "%.200s() takes no keyword arguments",
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180 f->m_ml->ml_name);
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181 return NULL;
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182 }
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183 if (flags & METH_VARARGS) {
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184 return (*meth)(self, arg);
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185 }
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186 if (!(flags & METH_VARARGS)) {
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187 /* the really old style */
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188 int size = PyTuple_GET_SIZE(arg);
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189 if (size == 1)
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190 arg = PyTuple_GET_ITEM(arg, 0);
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191 else if (size == 0)
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192 arg = NULL;
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193 return (*meth)(self, arg);
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194 }
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195 /* should never get here ??? */
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196 PyErr_BadInternalCall();
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197 return NULL;
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198 }
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199
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200
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201 PyTypeObject PyCFunction_Type = {
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202 PyObject_HEAD_INIT(&PyType_Type)
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203 0,
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204 "builtin_function_or_method",
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205 sizeof(PyCFunctionObject) + PyGC_HEAD_SIZE,
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206 0,
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207 (destructor)meth_dealloc, /* tp_dealloc */
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208 0, /* tp_print */
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209 0, /* tp_getattr */
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210 0, /* tp_setattr */
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211 (cmpfunc)meth_compare, /* tp_compare */
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212 (reprfunc)meth_repr, /* tp_repr */
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213 0, /* tp_as_number */
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214 0, /* tp_as_sequence */
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215 0, /* tp_as_mapping */
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216 (hashfunc)meth_hash, /* tp_hash */
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217 meth_call, /* tp_call */
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218 0, /* tp_str */
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219 PyObject_GenericGetAttr, /* tp_getattro */
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220 0, /* tp_setattro */
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221 0, /* tp_as_buffer */
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222 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_GC, /* tp_flags */
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223 0, /* tp_doc */
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224 (traverseproc)meth_traverse, /* tp_traverse */
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225 0, /* tp_clear */
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226 0, /* tp_richcompare */
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227 0, /* tp_weaklistoffset */
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228 0, /* tp_iter */
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229 0, /* tp_iternext */
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230 0, /* tp_methods */
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231 0, /* tp_members */
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232 meth_getsets, /* tp_getset */
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233 0, /* tp_base */
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234 0, /* tp_dict */
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235 };
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236
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237 /* List all methods in a chain -- helper for findmethodinchain */
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238
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239 static PyObject *
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240 listmethodchain(PyMethodChain *chain)
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241 {
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242 PyMethodChain *c;
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243 PyMethodDef *ml;
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244 int i, n;
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245 PyObject *v;
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246
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247 n = 0;
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248 for (c = chain; c != NULL; c = c->link) {
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249 for (ml = c->methods; ml->ml_name != NULL; ml++)
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250 n++;
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251 }
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252 v = PyList_New(n);
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253 if (v == NULL)
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254 return NULL;
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255 i = 0;
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256 for (c = chain; c != NULL; c = c->link) {
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257 for (ml = c->methods; ml->ml_name != NULL; ml++) {
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258 PyList_SetItem(v, i, PyString_FromString(ml->ml_name));
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259 i++;
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260 }
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261 }
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262 if (PyErr_Occurred()) {
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263 Py_DECREF(v);
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264 return NULL;
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265 }
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266 PyList_Sort(v);
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267 return v;
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268 }
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269
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270 /* Find a method in a method chain */
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271
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272 PyObject *
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273 Py_FindMethodInChain(PyMethodChain *chain, PyObject *self, char *name)
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274 {
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275 if (name[0] == '_' && name[1] == '_') {
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276 if (strcmp(name, "__methods__") == 0)
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277 return listmethodchain(chain);
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278 if (strcmp(name, "__doc__") == 0) {
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279 char *doc = self->ob_type->tp_doc;
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280 if (doc != NULL)
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281 return PyString_FromString(doc);
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282 }
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283 }
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284 while (chain != NULL) {
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285 PyMethodDef *ml = chain->methods;
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286 for (; ml->ml_name != NULL; ml++) {
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287 if (name[0] == ml->ml_name[0] &&
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288 strcmp(name+1, ml->ml_name+1) == 0)
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289 return PyCFunction_New(ml, self);
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290 }
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291 chain = chain->link;
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292 }
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293 PyErr_SetString(PyExc_AttributeError, name);
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294 return NULL;
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295 }
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296
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297 /* Find a method in a single method list */
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298
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299 PyObject *
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300 Py_FindMethod(PyMethodDef *methods, PyObject *self, char *name)
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301 {
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302 PyMethodChain chain;
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303 chain.methods = methods;
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304 chain.link = NULL;
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305 return Py_FindMethodInChain(&chain, self, name);
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306 }
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307
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308 /* Clear out the free list */
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309
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310 void
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311 PyCFunction_Fini(void)
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312 {
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313 while (free_list) {
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314 PyCFunctionObject *v = free_list;
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315 free_list = (PyCFunctionObject *)(v->m_self);
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316 v = (PyCFunctionObject *) PyObject_AS_GC(v);
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317 PyObject_DEL(v);
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318 }
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319 }