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annotate Objects/methodobject.c @ 79063:2bdc8c8ea42e

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Issue #15977: Fix memory leak in Modules/_ssl.c when the function _set_npn_protocols() is called multiple times
author Christian Heimes <christian@cheimes.de>
date Thu, 20 Sep 2012 12:42:54 +0200
parents d63a80abfbec
children 9e6ead98762e 3a86a3f1d89a
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 /* Free list for method objects to safe malloc/free overhead
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8 * The m_self element is used to chain the objects.
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9 */
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10 static PyCFunctionObject *free_list = NULL;
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11 static int numfree = 0;
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12 #ifndef PyCFunction_MAXFREELIST
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13 #define PyCFunction_MAXFREELIST 256
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14 #endif
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15
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16 PyObject *
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17 PyCFunction_NewEx(PyMethodDef *ml, PyObject *self, PyObject *module)
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18 {
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19 PyCFunctionObject *op;
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20 op = free_list;
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21 if (op != NULL) {
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22 free_list = (PyCFunctionObject *)(op->m_self);
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23 PyObject_INIT(op, &PyCFunction_Type);
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24 numfree--;
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25 }
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26 else {
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27 op = PyObject_GC_New(PyCFunctionObject, &PyCFunction_Type);
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28 if (op == NULL)
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29 return NULL;
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30 }
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31 op->m_ml = ml;
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32 Py_XINCREF(self);
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33 op->m_self = self;
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34 Py_XINCREF(module);
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35 op->m_module = module;
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36 _PyObject_GC_TRACK(op);
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37 return (PyObject *)op;
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38 }
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39
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40 PyCFunction
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41 PyCFunction_GetFunction(PyObject *op)
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42 {
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43 if (!PyCFunction_Check(op)) {
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44 PyErr_BadInternalCall();
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45 return NULL;
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46 }
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47 return PyCFunction_GET_FUNCTION(op);
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48 }
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49
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50 PyObject *
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51 PyCFunction_GetSelf(PyObject *op)
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52 {
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53 if (!PyCFunction_Check(op)) {
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54 PyErr_BadInternalCall();
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55 return NULL;
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56 }
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57 return PyCFunction_GET_SELF(op);
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58 }
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59
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60 int
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61 PyCFunction_GetFlags(PyObject *op)
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62 {
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63 if (!PyCFunction_Check(op)) {
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64 PyErr_BadInternalCall();
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65 return -1;
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66 }
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67 return PyCFunction_GET_FLAGS(op);
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68 }
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69
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70 PyObject *
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71 PyCFunction_Call(PyObject *func, PyObject *arg, PyObject *kw)
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72 {
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73 PyCFunctionObject* f = (PyCFunctionObject*)func;
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74 PyCFunction meth = PyCFunction_GET_FUNCTION(func);
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75 PyObject *self = PyCFunction_GET_SELF(func);
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76 Py_ssize_t size;
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77
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78 switch (PyCFunction_GET_FLAGS(func) & ~(METH_CLASS | METH_STATIC | METH_COEXIST)) {
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79 case METH_VARARGS:
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80 if (kw == NULL || PyDict_Size(kw) == 0)
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81 return (*meth)(self, arg);
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82 break;
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83 case METH_VARARGS | METH_KEYWORDS:
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84 return (*(PyCFunctionWithKeywords)meth)(self, arg, kw);
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85 case METH_NOARGS:
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86 if (kw == NULL || PyDict_Size(kw) == 0) {
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87 size = PyTuple_GET_SIZE(arg);
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88 if (size == 0)
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89 return (*meth)(self, NULL);
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90 PyErr_Format(PyExc_TypeError,
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91 "%.200s() takes no arguments (%zd given)",
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92 f->m_ml->ml_name, size);
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93 return NULL;
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94 }
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95 break;
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96 case METH_O:
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97 if (kw == NULL || PyDict_Size(kw) == 0) {
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98 size = PyTuple_GET_SIZE(arg);
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99 if (size == 1)
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100 return (*meth)(self, PyTuple_GET_ITEM(arg, 0));
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101 PyErr_Format(PyExc_TypeError,
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102 "%.200s() takes exactly one argument (%zd given)",
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103 f->m_ml->ml_name, size);
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104 return NULL;
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105 }
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106 break;
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107 default:
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108 PyErr_SetString(PyExc_SystemError, "Bad call flags in "
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109 "PyCFunction_Call. METH_OLDARGS is no "
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110 "longer supported!");
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111
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112 return NULL;
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113 }
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114 PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments",
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115 f->m_ml->ml_name);
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116 return NULL;
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117 }
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118
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119 /* Methods (the standard built-in methods, that is) */
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120
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121 static void
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122 meth_dealloc(PyCFunctionObject *m)
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123 {
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124 _PyObject_GC_UNTRACK(m);
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125 Py_XDECREF(m->m_self);
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126 Py_XDECREF(m->m_module);
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127 if (numfree < PyCFunction_MAXFREELIST) {
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128 m->m_self = (PyObject *)free_list;
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129 free_list = m;
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130 numfree++;
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131 }
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132 else {
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133 PyObject_GC_Del(m);
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134 }
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135 }
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136
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137 static PyObject *
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138 meth_get__doc__(PyCFunctionObject *m, void *closure)
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139 {
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140 const char *doc = m->m_ml->ml_doc;
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141
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142 if (doc != NULL)
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143 return PyUnicode_FromString(doc);
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144 Py_INCREF(Py_None);
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145 return Py_None;
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146 }
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147
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148 static PyObject *
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149 meth_get__name__(PyCFunctionObject *m, void *closure)
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150 {
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151 return PyUnicode_FromString(m->m_ml->ml_name);
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152 }
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153
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154 static PyObject *
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155 meth_get__qualname__(PyCFunctionObject *m, void *closure)
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156 {
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157 /* If __self__ is a module or NULL, return m.__name__
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158 (e.g. len.__qualname__ == 'len')
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159
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160 If __self__ is a type, return m.__self__.__qualname__ + '.' + m.__name__
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161 (e.g. dict.fromkeys.__qualname__ == 'dict.fromkeys')
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162
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163 Otherwise return type(m.__self__).__qualname__ + '.' + m.__name__
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164 (e.g. [].append.__qualname__ == 'list.append') */
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165 PyObject *type, *type_qualname, *res;
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166 _Py_IDENTIFIER(__qualname__);
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167
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168 if (m->m_self == NULL || PyModule_Check(m->m_self))
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169 return PyUnicode_FromString(m->m_ml->ml_name);
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170
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171 type = PyType_Check(m->m_self) ? m->m_self : (PyObject*)Py_TYPE(m->m_self);
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172
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173 type_qualname = _PyObject_GetAttrId(type, &PyId___qualname__);
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174 if (type_qualname == NULL)
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175 return NULL;
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176
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177 if (!PyUnicode_Check(type_qualname)) {
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178 PyErr_SetString(PyExc_TypeError, "<method>.__class__."
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179 "__qualname__ is not a unicode object");
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180 Py_XDECREF(type_qualname);
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181 return NULL;
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182 }
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183
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184 res = PyUnicode_FromFormat("%S.%s", type_qualname, m->m_ml->ml_name);
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185 Py_DECREF(type_qualname);
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186 return res;
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187 }
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188
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189 static int
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190 meth_traverse(PyCFunctionObject *m, visitproc visit, void *arg)
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191 {
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192 Py_VISIT(m->m_self);
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193 Py_VISIT(m->m_module);
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194 return 0;
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195 }
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196
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197 static PyObject *
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198 meth_get__self__(PyCFunctionObject *m, void *closure)
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199 {
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200 PyObject *self;
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201
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202 self = PyCFunction_GET_SELF(m);
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203 if (self == NULL)
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204 self = Py_None;
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205 Py_INCREF(self);
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206 return self;
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207 }
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208
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209 static PyGetSetDef meth_getsets [] = {
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210 {"__doc__", (getter)meth_get__doc__, NULL, NULL},
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211 {"__name__", (getter)meth_get__name__, NULL, NULL},
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212 {"__qualname__", (getter)meth_get__qualname__, NULL, NULL},
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213 {"__self__", (getter)meth_get__self__, NULL, NULL},
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214 {0}
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215 };
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216
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217 #define OFF(x) offsetof(PyCFunctionObject, x)
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218
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219 static PyMemberDef meth_members[] = {
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220 {"__module__", T_OBJECT, OFF(m_module), PY_WRITE_RESTRICTED},
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221 {NULL}
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222 };
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223
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224 static PyObject *
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225 meth_repr(PyCFunctionObject *m)
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226 {
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227 if (m->m_self == NULL || PyModule_Check(m->m_self))
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228 return PyUnicode_FromFormat("<built-in function %s>",
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229 m->m_ml->ml_name);
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230 return PyUnicode_FromFormat("<built-in method %s of %s object at %p>",
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231 m->m_ml->ml_name,
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232 m->m_self->ob_type->tp_name,
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233 m->m_self);
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234 }
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235
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236 static PyObject *
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237 meth_richcompare(PyObject *self, PyObject *other, int op)
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238 {
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239 PyCFunctionObject *a, *b;
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240 PyObject *res;
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241 int eq;
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242
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243 if ((op != Py_EQ && op != Py_NE) ||
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244 !PyCFunction_Check(self) ||
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245 !PyCFunction_Check(other))
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246 {
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247 Py_RETURN_NOTIMPLEMENTED;
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248 }
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249 a = (PyCFunctionObject *)self;
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250 b = (PyCFunctionObject *)other;
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251 eq = a->m_self == b->m_self;
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252 if (eq)
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253 eq = a->m_ml->ml_meth == b->m_ml->ml_meth;
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254 if (op == Py_EQ)
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255 res = eq ? Py_True : Py_False;
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256 else
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257 res = eq ? Py_False : Py_True;
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258 Py_INCREF(res);
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259 return res;
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260 }
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261
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262 static Py_hash_t
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263 meth_hash(PyCFunctionObject *a)
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264 {
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265 Py_hash_t x, y;
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266 if (a->m_self == NULL)
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267 x = 0;
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268 else {
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269 x = PyObject_Hash(a->m_self);
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270 if (x == -1)
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271 return -1;
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272 }
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273 y = _Py_HashPointer((void*)(a->m_ml->ml_meth));
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274 if (y == -1)
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275 return -1;
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276 x ^= y;
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277 if (x == -1)
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278 x = -2;
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279 return x;
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280 }
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281
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282
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283 PyTypeObject PyCFunction_Type = {
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284 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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285 "builtin_function_or_method",
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286 sizeof(PyCFunctionObject),
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287 0,
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288 (destructor)meth_dealloc, /* tp_dealloc */
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289 0, /* tp_print */
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290 0, /* tp_getattr */
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291 0, /* tp_setattr */
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292 0, /* tp_reserved */
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293 (reprfunc)meth_repr, /* tp_repr */
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294 0, /* tp_as_number */
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295 0, /* tp_as_sequence */
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296 0, /* tp_as_mapping */
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297 (hashfunc)meth_hash, /* tp_hash */
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298 PyCFunction_Call, /* tp_call */
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299 0, /* tp_str */
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300 PyObject_GenericGetAttr, /* tp_getattro */
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301 0, /* tp_setattro */
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302 0, /* tp_as_buffer */
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303 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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304 0, /* tp_doc */
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305 (traverseproc)meth_traverse, /* tp_traverse */
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306 0, /* tp_clear */
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307 meth_richcompare, /* tp_richcompare */
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308 0, /* tp_weaklistoffset */
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309 0, /* tp_iter */
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310 0, /* tp_iternext */
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311 0, /* tp_methods */
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312 meth_members, /* tp_members */
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313 meth_getsets, /* tp_getset */
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314 0, /* tp_base */
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315 0, /* tp_dict */
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316 };
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317
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318 /* Clear out the free list */
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319
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320 int
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321 PyCFunction_ClearFreeList(void)
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322 {
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323 int freelist_size = numfree;
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324
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325 while (free_list) {
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326 PyCFunctionObject *v = free_list;
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327 free_list = (PyCFunctionObject *)(v->m_self);
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328 PyObject_GC_Del(v);
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329 numfree--;
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330 }
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331 assert(numfree == 0);
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332 return freelist_size;
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333 }
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334
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335 void
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336 PyCFunction_Fini(void)
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337 {
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338 (void)PyCFunction_ClearFreeList();
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339 }
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340
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341 /* Print summary info about the state of the optimized allocator */
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342 void
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343 _PyCFunction_DebugMallocStats(FILE *out)
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344 {
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345 _PyDebugAllocatorStats(out,
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346 "free PyCFunction",
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347 numfree, sizeof(PyCFunction));
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348 }
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349
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350 /* PyCFunction_New() is now just a macro that calls PyCFunction_NewEx(),
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351 but it's part of the API so we need to keep a function around that
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352 existing C extensions can call.
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353 */
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354
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355 #undef PyCFunction_New
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356 PyAPI_FUNC(PyObject *) PyCFunction_New(PyMethodDef *, PyObject *);
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357
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358 PyObject *
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359 PyCFunction_New(PyMethodDef *ml, PyObject *self)
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360 {
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361 return PyCFunction_NewEx(ml, self, NULL);
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362 }