Mercurial > cpython-lru_cache-weakref

annotate Objects/methodobject.c @ 39496:352ffe77b71d legacy-trunk

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Patch #1535500: fix segfault in BZ2File.writelines and make sure it raises the correct exceptions.
author Georg Brandl <georg@python.org>
date Mon, 14 Aug 2006 21:42:55 +0000
parents 7b2e436a4a21
children 6620a510e9a9 13d5e5f0e993
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 #include "structmember.h"
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6
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7 static PyCFunctionObject *free_list = NULL;
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8
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9 PyObject *
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10 PyCFunction_NewEx(PyMethodDef *ml, PyObject *self, PyObject *module)
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11 {
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12 PyCFunctionObject *op;
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13 op = free_list;
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14 if (op != NULL) {
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15 free_list = (PyCFunctionObject *)(op->m_self);
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16 PyObject_INIT(op, &PyCFunction_Type);
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17 }
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18 else {
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19 op = PyObject_GC_New(PyCFunctionObject, &PyCFunction_Type);
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20 if (op == NULL)
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21 return NULL;
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22 }
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23 op->m_ml = ml;
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24 Py_XINCREF(self);
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25 op->m_self = self;
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26 Py_XINCREF(module);
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27 op->m_module = module;
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28 _PyObject_GC_TRACK(op);
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29 return (PyObject *)op;
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30 }
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31
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32 PyCFunction
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33 PyCFunction_GetFunction(PyObject *op)
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34 {
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35 if (!PyCFunction_Check(op)) {
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36 PyErr_BadInternalCall();
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37 return NULL;
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38 }
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39 return ((PyCFunctionObject *)op) -> m_ml -> ml_meth;
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40 }
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41
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42 PyObject *
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43 PyCFunction_GetSelf(PyObject *op)
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44 {
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45 if (!PyCFunction_Check(op)) {
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46 PyErr_BadInternalCall();
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47 return NULL;
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48 }
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49 return ((PyCFunctionObject *)op) -> m_self;
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50 }
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51
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52 int
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53 PyCFunction_GetFlags(PyObject *op)
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54 {
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55 if (!PyCFunction_Check(op)) {
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56 PyErr_BadInternalCall();
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57 return -1;
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58 }
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59 return ((PyCFunctionObject *)op) -> m_ml -> ml_flags;
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60 }
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61
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62 PyObject *
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63 PyCFunction_Call(PyObject *func, PyObject *arg, PyObject *kw)
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64 {
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65 PyCFunctionObject* f = (PyCFunctionObject*)func;
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66 PyCFunction meth = PyCFunction_GET_FUNCTION(func);
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67 PyObject *self = PyCFunction_GET_SELF(func);
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68 Py_ssize_t size;
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69
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70 switch (PyCFunction_GET_FLAGS(func) & ~(METH_CLASS | METH_STATIC | METH_COEXIST)) {
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71 case METH_VARARGS:
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72 if (kw == NULL || PyDict_Size(kw) == 0)
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73 return (*meth)(self, arg);
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74 break;
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75 case METH_VARARGS | METH_KEYWORDS:
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76 case METH_OLDARGS | METH_KEYWORDS:
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77 return (*(PyCFunctionWithKeywords)meth)(self, arg, kw);
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78 case METH_NOARGS:
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79 if (kw == NULL || PyDict_Size(kw) == 0) {
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80 size = PyTuple_GET_SIZE(arg);
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81 if (size == 0)
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82 return (*meth)(self, NULL);
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83 PyErr_Format(PyExc_TypeError,
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84 "%.200s() takes no arguments (%zd given)",
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85 f->m_ml->ml_name, size);
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86 return NULL;
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87 }
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88 break;
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89 case METH_O:
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90 if (kw == NULL || PyDict_Size(kw) == 0) {
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91 size = PyTuple_GET_SIZE(arg);
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92 if (size == 1)
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93 return (*meth)(self, PyTuple_GET_ITEM(arg, 0));
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94 PyErr_Format(PyExc_TypeError,
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95 "%.200s() takes exactly one argument (%zd given)",
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96 f->m_ml->ml_name, size);
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97 return NULL;
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98 }
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99 break;
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100 case METH_OLDARGS:
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101 /* the really old style */
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102 if (kw == NULL || PyDict_Size(kw) == 0) {
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103 size = PyTuple_GET_SIZE(arg);
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104 if (size == 1)
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105 arg = PyTuple_GET_ITEM(arg, 0);
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106 else if (size == 0)
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107 arg = NULL;
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108 return (*meth)(self, arg);
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109 }
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110 break;
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111 default:
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112 PyErr_BadInternalCall();
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113 return NULL;
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114 }
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115 PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments",
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116 f->m_ml->ml_name);
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117 return NULL;
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118 }
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119
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120 /* Methods (the standard built-in methods, that is) */
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121
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122 static void
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123 meth_dealloc(PyCFunctionObject *m)
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124 {
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125 _PyObject_GC_UNTRACK(m);
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126 Py_XDECREF(m->m_self);
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127 Py_XDECREF(m->m_module);
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128 m->m_self = (PyObject *)free_list;
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129 free_list = m;
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130 }
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131
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132 static PyObject *
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133 meth_get__doc__(PyCFunctionObject *m, void *closure)
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134 {
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135 const char *doc = m->m_ml->ml_doc;
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136
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137 if (doc != NULL)
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138 return PyString_FromString(doc);
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139 Py_INCREF(Py_None);
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140 return Py_None;
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141 }
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142
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143 static PyObject *
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144 meth_get__name__(PyCFunctionObject *m, void *closure)
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145 {
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146 return PyString_FromString(m->m_ml->ml_name);
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147 }
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148
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149 static int
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150 meth_traverse(PyCFunctionObject *m, visitproc visit, void *arg)
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151 {
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152 Py_VISIT(m->m_self);
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153 Py_VISIT(m->m_module);
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154 return 0;
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155 }
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156
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157 static PyObject *
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158 meth_get__self__(PyCFunctionObject *m, void *closure)
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159 {
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160 PyObject *self;
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161 if (PyEval_GetRestricted()) {
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162 PyErr_SetString(PyExc_RuntimeError,
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163 "method.__self__ not accessible in restricted mode");
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164 return NULL;
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165 }
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166 self = m->m_self;
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167 if (self == NULL)
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168 self = Py_None;
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169 Py_INCREF(self);
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170 return self;
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171 }
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172
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173 static PyGetSetDef meth_getsets [] = {
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174 {"__doc__", (getter)meth_get__doc__, NULL, NULL},
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175 {"__name__", (getter)meth_get__name__, NULL, NULL},
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176 {"__self__", (getter)meth_get__self__, NULL, NULL},
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177 {0}
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178 };
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179
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180 #define OFF(x) offsetof(PyCFunctionObject, x)
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181
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182 static PyMemberDef meth_members[] = {
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183 {"__module__", T_OBJECT, OFF(m_module), WRITE_RESTRICTED},
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184 {NULL}
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185 };
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186
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187 static PyObject *
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188 meth_repr(PyCFunctionObject *m)
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189 {
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190 if (m->m_self == NULL)
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191 return PyString_FromFormat("<built-in function %s>",
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192 m->m_ml->ml_name);
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193 return PyString_FromFormat("<built-in method %s of %s object at %p>",
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194 m->m_ml->ml_name,
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195 m->m_self->ob_type->tp_name,
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196 m->m_self);
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197 }
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198
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199 static int
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200 meth_compare(PyCFunctionObject *a, PyCFunctionObject *b)
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201 {
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202 if (a->m_self != b->m_self)
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203 return (a->m_self < b->m_self) ? -1 : 1;
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204 if (a->m_ml->ml_meth == b->m_ml->ml_meth)
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205 return 0;
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206 if (strcmp(a->m_ml->ml_name, b->m_ml->ml_name) < 0)
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207 return -1;
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208 else
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209 return 1;
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210 }
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211
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212 static long
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213 meth_hash(PyCFunctionObject *a)
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214 {
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215 long x,y;
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216 if (a->m_self == NULL)
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217 x = 0;
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218 else {
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219 x = PyObject_Hash(a->m_self);
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220 if (x == -1)
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221 return -1;
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222 }
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223 y = _Py_HashPointer((void*)(a->m_ml->ml_meth));
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224 if (y == -1)
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225 return -1;
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226 x ^= y;
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227 if (x == -1)
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228 x = -2;
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229 return x;
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230 }
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231
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232
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233 PyTypeObject PyCFunction_Type = {
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234 PyObject_HEAD_INIT(&PyType_Type)
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235 0,
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236 "builtin_function_or_method",
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237 sizeof(PyCFunctionObject),
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238 0,
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239 (destructor)meth_dealloc, /* tp_dealloc */
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240 0, /* tp_print */
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241 0, /* tp_getattr */
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242 0, /* tp_setattr */
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243 (cmpfunc)meth_compare, /* tp_compare */
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244 (reprfunc)meth_repr, /* tp_repr */
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245 0, /* tp_as_number */
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246 0, /* tp_as_sequence */
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247 0, /* tp_as_mapping */
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248 (hashfunc)meth_hash, /* tp_hash */
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249 PyCFunction_Call, /* tp_call */
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250 0, /* tp_str */
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251 PyObject_GenericGetAttr, /* tp_getattro */
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252 0, /* tp_setattro */
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253 0, /* tp_as_buffer */
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254 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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255 0, /* tp_doc */
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256 (traverseproc)meth_traverse, /* tp_traverse */
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257 0, /* tp_clear */
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258 0, /* tp_richcompare */
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259 0, /* tp_weaklistoffset */
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260 0, /* tp_iter */
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261 0, /* tp_iternext */
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262 0, /* tp_methods */
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263 meth_members, /* tp_members */
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264 meth_getsets, /* tp_getset */
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265 0, /* tp_base */
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266 0, /* tp_dict */
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267 };
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268
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269 /* List all methods in a chain -- helper for findmethodinchain */
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270
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271 static PyObject *
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272 listmethodchain(PyMethodChain *chain)
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273 {
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274 PyMethodChain *c;
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275 PyMethodDef *ml;
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276 int i, n;
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277 PyObject *v;
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278
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279 n = 0;
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280 for (c = chain; c != NULL; c = c->link) {
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281 for (ml = c->methods; ml->ml_name != NULL; ml++)
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282 n++;
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283 }
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284 v = PyList_New(n);
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285 if (v == NULL)
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286 return NULL;
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287 i = 0;
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288 for (c = chain; c != NULL; c = c->link) {
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289 for (ml = c->methods; ml->ml_name != NULL; ml++) {
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290 PyList_SetItem(v, i, PyString_FromString(ml->ml_name));
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291 i++;
395
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292 }
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293 }
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294 if (PyErr_Occurred()) {
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295 Py_DECREF(v);
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296 return NULL;
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297 }
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298 PyList_Sort(v);
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299 return v;
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300 }
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301
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302 /* Find a method in a method chain */
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303
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304 PyObject *
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305 Py_FindMethodInChain(PyMethodChain *chain, PyObject *self, const char *name)
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306 {
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307 if (name[0] == '_' && name[1] == '_') {
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308 if (strcmp(name, "__methods__") == 0)
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309 return listmethodchain(chain);
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310 if (strcmp(name, "__doc__") == 0) {
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311 const char *doc = self->ob_type->tp_doc;
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312 if (doc != NULL)
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313 return PyString_FromString(doc);
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314 }
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315 }
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316 while (chain != NULL) {
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317 PyMethodDef *ml = chain->methods;
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318 for (; ml->ml_name != NULL; ml++) {
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319 if (name[0] == ml->ml_name[0] &&
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320 strcmp(name+1, ml->ml_name+1) == 0)
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321 /* XXX */
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322 return PyCFunction_New(ml, self);
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323 }
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324 chain = chain->link;
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325 }
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326 PyErr_SetString(PyExc_AttributeError, name);
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327 return NULL;
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328 }
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329
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330 /* Find a method in a single method list */
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331
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332 PyObject *
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333 Py_FindMethod(PyMethodDef *methods, PyObject *self, const char *name)
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334 {
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335 PyMethodChain chain;
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336 chain.methods = methods;
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337 chain.link = NULL;
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338 return Py_FindMethodInChain(&chain, self, name);
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339 }
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340
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341 /* Clear out the free list */
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342
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343 void
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344 PyCFunction_Fini(void)
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345 {
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346 while (free_list) {
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347 PyCFunctionObject *v = free_list;
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348 free_list = (PyCFunctionObject *)(v->m_self);
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349 PyObject_GC_Del(v);
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350 }
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351 }
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352
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353 /* PyCFunction_New() is now just a macro that calls PyCFunction_NewEx(),
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354 but it's part of the API so we need to keep a function around that
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355 existing C extensions can call.
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356 */
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357
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358 #undef PyCFunction_New
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359 PyAPI_FUNC(PyObject *) PyCFunction_New(PyMethodDef *, PyObject *);
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360
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361 PyObject *
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362 PyCFunction_New(PyMethodDef *ml, PyObject *self)
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363 {
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364 return PyCFunction_NewEx(ml, self, NULL);
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365 }