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annotate Objects/methodobject.c @ 87081:dc5ae99bc605

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Issue #19437: Fix GetKeepedObjects() of ctypes, handle PyCData_GetContainer() failure
author Victor Stinner <victor.stinner@gmail.com>
date Wed, 13 Nov 2013 13:24:50 +0100
parents 5e50f1a0c985
children 78ec18f5cb45
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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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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 /* undefine macro trampoline to PyCFunction_NewEx */
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17 #undef PyCFunction_New
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18
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19 PyObject *
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20 PyCFunction_New(PyMethodDef *ml, PyObject *self)
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21 {
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22 return PyCFunction_NewEx(ml, self, NULL);
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23 }
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24
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25 PyObject *
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26 PyCFunction_NewEx(PyMethodDef *ml, PyObject *self, PyObject *module)
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27 {
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28 PyCFunctionObject *op;
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29 op = free_list;
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30 if (op != NULL) {
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31 free_list = (PyCFunctionObject *)(op->m_self);
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32 PyObject_INIT(op, &PyCFunction_Type);
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33 numfree--;
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34 }
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35 else {
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36 op = PyObject_GC_New(PyCFunctionObject, &PyCFunction_Type);
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37 if (op == NULL)
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38 return NULL;
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39 }
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40 op->m_ml = ml;
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41 Py_XINCREF(self);
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42 op->m_self = self;
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43 Py_XINCREF(module);
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44 op->m_module = module;
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45 _PyObject_GC_TRACK(op);
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46 return (PyObject *)op;
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47 }
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48
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49 PyCFunction
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50 PyCFunction_GetFunction(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 NULL;
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55 }
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56 return PyCFunction_GET_FUNCTION(op);
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57 }
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58
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59 PyObject *
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60 PyCFunction_GetSelf(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 PyCFunction_GET_SELF(op);
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67 }
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68
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69 int
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70 PyCFunction_GetFlags(PyObject *op)
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71 {
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72 if (!PyCFunction_Check(op)) {
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73 PyErr_BadInternalCall();
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74 return -1;
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75 }
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76 return PyCFunction_GET_FLAGS(op);
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77 }
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78
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79 PyObject *
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80 PyCFunction_Call(PyObject *func, PyObject *arg, PyObject *kw)
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81 {
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82 #define CHECK_RESULT(res) assert(res != NULL || PyErr_Occurred())
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83
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84 PyCFunctionObject* f = (PyCFunctionObject*)func;
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85 PyCFunction meth = PyCFunction_GET_FUNCTION(func);
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86 PyObject *self = PyCFunction_GET_SELF(func);
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87 PyObject *res;
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88 Py_ssize_t size;
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89
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90 switch (PyCFunction_GET_FLAGS(func) & ~(METH_CLASS | METH_STATIC | METH_COEXIST)) {
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91 case METH_VARARGS:
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92 if (kw == NULL || PyDict_Size(kw) == 0) {
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93 res = (*meth)(self, arg);
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94 CHECK_RESULT(res);
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95 return res;
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96 }
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97 break;
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98 case METH_VARARGS | METH_KEYWORDS:
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99 res = (*(PyCFunctionWithKeywords)meth)(self, arg, kw);
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100 CHECK_RESULT(res);
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101 return res;
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102 case METH_NOARGS:
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103 if (kw == NULL || PyDict_Size(kw) == 0) {
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104 size = PyTuple_GET_SIZE(arg);
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105 if (size == 0) {
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106 res = (*meth)(self, NULL);
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107 CHECK_RESULT(res);
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108 return res;
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109 }
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110 PyErr_Format(PyExc_TypeError,
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111 "%.200s() takes no arguments (%zd given)",
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112 f->m_ml->ml_name, size);
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113 return NULL;
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114 }
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115 break;
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116 case METH_O:
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117 if (kw == NULL || PyDict_Size(kw) == 0) {
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118 size = PyTuple_GET_SIZE(arg);
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119 if (size == 1) {
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120 res = (*meth)(self, PyTuple_GET_ITEM(arg, 0));
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121 CHECK_RESULT(res);
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122 return res;
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123 }
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124 PyErr_Format(PyExc_TypeError,
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125 "%.200s() takes exactly one argument (%zd given)",
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126 f->m_ml->ml_name, size);
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127 return NULL;
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128 }
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129 break;
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130 default:
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131 PyErr_SetString(PyExc_SystemError, "Bad call flags in "
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132 "PyCFunction_Call. METH_OLDARGS is no "
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133 "longer supported!");
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134
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135 return NULL;
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136 }
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137 PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments",
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138 f->m_ml->ml_name);
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139 return NULL;
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140
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141 #undef CHECK_RESULT
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142 }
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143
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144 /* Methods (the standard built-in methods, that is) */
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145
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146 static void
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147 meth_dealloc(PyCFunctionObject *m)
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148 {
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149 _PyObject_GC_UNTRACK(m);
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150 Py_XDECREF(m->m_self);
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151 Py_XDECREF(m->m_module);
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152 if (numfree < PyCFunction_MAXFREELIST) {
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153 m->m_self = (PyObject *)free_list;
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154 free_list = m;
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155 numfree++;
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156 }
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157 else {
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158 PyObject_GC_Del(m);
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159 }
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160 }
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161
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162 static PyObject *
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163 meth_get__doc__(PyCFunctionObject *m, void *closure)
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164 {
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165 const char *doc = m->m_ml->ml_doc;
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166
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167 if (doc != NULL)
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168 return PyUnicode_FromString(doc);
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169 Py_INCREF(Py_None);
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170 return Py_None;
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171 }
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172
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173 static PyObject *
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174 meth_get__name__(PyCFunctionObject *m, void *closure)
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175 {
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176 return PyUnicode_FromString(m->m_ml->ml_name);
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177 }
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178
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179 static PyObject *
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180 meth_get__qualname__(PyCFunctionObject *m, void *closure)
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181 {
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182 /* If __self__ is a module or NULL, return m.__name__
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183 (e.g. len.__qualname__ == 'len')
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184
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185 If __self__ is a type, return m.__self__.__qualname__ + '.' + m.__name__
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186 (e.g. dict.fromkeys.__qualname__ == 'dict.fromkeys')
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187
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188 Otherwise return type(m.__self__).__qualname__ + '.' + m.__name__
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189 (e.g. [].append.__qualname__ == 'list.append') */
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190 PyObject *type, *type_qualname, *res;
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191 _Py_IDENTIFIER(__qualname__);
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192
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193 if (m->m_self == NULL || PyModule_Check(m->m_self))
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194 return PyUnicode_FromString(m->m_ml->ml_name);
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195
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196 type = PyType_Check(m->m_self) ? m->m_self : (PyObject*)Py_TYPE(m->m_self);
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197
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198 type_qualname = _PyObject_GetAttrId(type, &PyId___qualname__);
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199 if (type_qualname == NULL)
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200 return NULL;
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201
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202 if (!PyUnicode_Check(type_qualname)) {
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203 PyErr_SetString(PyExc_TypeError, "<method>.__class__."
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204 "__qualname__ is not a unicode object");
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205 Py_XDECREF(type_qualname);
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206 return NULL;
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207 }
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208
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209 res = PyUnicode_FromFormat("%S.%s", type_qualname, m->m_ml->ml_name);
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210 Py_DECREF(type_qualname);
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211 return res;
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212 }
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213
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214 static int
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215 meth_traverse(PyCFunctionObject *m, visitproc visit, void *arg)
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216 {
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217 Py_VISIT(m->m_self);
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218 Py_VISIT(m->m_module);
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219 return 0;
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220 }
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221
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222 static PyObject *
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223 meth_get__self__(PyCFunctionObject *m, void *closure)
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224 {
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225 PyObject *self;
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226
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227 self = PyCFunction_GET_SELF(m);
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228 if (self == NULL)
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229 self = Py_None;
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230 Py_INCREF(self);
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231 return self;
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232 }
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233
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234 static PyGetSetDef meth_getsets [] = {
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235 {"__doc__", (getter)meth_get__doc__, NULL, NULL},
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236 {"__name__", (getter)meth_get__name__, NULL, NULL},
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237 {"__qualname__", (getter)meth_get__qualname__, NULL, NULL},
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238 {"__self__", (getter)meth_get__self__, NULL, NULL},
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239 {0}
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240 };
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241
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242 #define OFF(x) offsetof(PyCFunctionObject, x)
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243
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244 static PyMemberDef meth_members[] = {
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245 {"__module__", T_OBJECT, OFF(m_module), PY_WRITE_RESTRICTED},
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246 {NULL}
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247 };
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248
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249 static PyObject *
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250 meth_repr(PyCFunctionObject *m)
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251 {
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252 if (m->m_self == NULL || PyModule_Check(m->m_self))
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253 return PyUnicode_FromFormat("<built-in function %s>",
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254 m->m_ml->ml_name);
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255 return PyUnicode_FromFormat("<built-in method %s of %s object at %p>",
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256 m->m_ml->ml_name,
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257 m->m_self->ob_type->tp_name,
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258 m->m_self);
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259 }
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260
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261 static PyObject *
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262 meth_richcompare(PyObject *self, PyObject *other, int op)
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263 {
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264 PyCFunctionObject *a, *b;
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265 PyObject *res;
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266 int eq;
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267
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268 if ((op != Py_EQ && op != Py_NE) ||
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269 !PyCFunction_Check(self) ||
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270 !PyCFunction_Check(other))
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271 {
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272 Py_RETURN_NOTIMPLEMENTED;
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273 }
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274 a = (PyCFunctionObject *)self;
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275 b = (PyCFunctionObject *)other;
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276 eq = a->m_self == b->m_self;
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277 if (eq)
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278 eq = a->m_ml->ml_meth == b->m_ml->ml_meth;
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279 if (op == Py_EQ)
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280 res = eq ? Py_True : Py_False;
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281 else
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282 res = eq ? Py_False : Py_True;
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283 Py_INCREF(res);
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284 return res;
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285 }
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286
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287 static Py_hash_t
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288 meth_hash(PyCFunctionObject *a)
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289 {
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290 Py_hash_t x, y;
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291 if (a->m_self == NULL)
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292 x = 0;
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293 else {
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294 x = PyObject_Hash(a->m_self);
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295 if (x == -1)
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296 return -1;
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297 }
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298 y = _Py_HashPointer((void*)(a->m_ml->ml_meth));
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299 if (y == -1)
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300 return -1;
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301 x ^= y;
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302 if (x == -1)
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303 x = -2;
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304 return x;
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305 }
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306
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307
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308 PyTypeObject PyCFunction_Type = {
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309 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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310 "builtin_function_or_method",
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311 sizeof(PyCFunctionObject),
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312 0,
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313 (destructor)meth_dealloc, /* tp_dealloc */
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314 0, /* tp_print */
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315 0, /* tp_getattr */
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316 0, /* tp_setattr */
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317 0, /* tp_reserved */
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318 (reprfunc)meth_repr, /* tp_repr */
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319 0, /* tp_as_number */
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320 0, /* tp_as_sequence */
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321 0, /* tp_as_mapping */
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322 (hashfunc)meth_hash, /* tp_hash */
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323 PyCFunction_Call, /* tp_call */
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324 0, /* tp_str */
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325 PyObject_GenericGetAttr, /* tp_getattro */
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326 0, /* tp_setattro */
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327 0, /* tp_as_buffer */
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328 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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329 0, /* tp_doc */
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330 (traverseproc)meth_traverse, /* tp_traverse */
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331 0, /* tp_clear */
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332 meth_richcompare, /* tp_richcompare */
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333 0, /* tp_weaklistoffset */
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334 0, /* tp_iter */
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335 0, /* tp_iternext */
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336 0, /* tp_methods */
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337 meth_members, /* tp_members */
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338 meth_getsets, /* tp_getset */
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339 0, /* tp_base */
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340 0, /* tp_dict */
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341 };
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342
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343 /* Clear out the free list */
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344
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345 int
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346 PyCFunction_ClearFreeList(void)
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347 {
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348 int freelist_size = numfree;
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349
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350 while (free_list) {
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351 PyCFunctionObject *v = free_list;
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352 free_list = (PyCFunctionObject *)(v->m_self);
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353 PyObject_GC_Del(v);
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354 numfree--;
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355 }
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356 assert(numfree == 0);
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357 return freelist_size;
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358 }
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359
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360 void
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361 PyCFunction_Fini(void)
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362 {
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363 (void)PyCFunction_ClearFreeList();
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364 }
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365
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366 /* Print summary info about the state of the optimized allocator */
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367 void
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368 _PyCFunction_DebugMallocStats(FILE *out)
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369 {
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370 _PyDebugAllocatorStats(out,
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371 "free PyCFunctionObject",
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372 numfree, sizeof(PyCFunctionObject));
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373 }