Mercurial > cpython-lru_cache-weakref

annotate Objects/methodobject.c @ 18572:9b8564f6e34d legacy-trunk

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Remove comments about XML and HTML; those sections are no longer part of this chapter. Minor change to match the style guide.
author Fred Drake <fdrake@acm.org>
date Sat, 14 Jul 2001 02:44:43 +0000
parents b2bf88e06fc5
children 09df3254b49d
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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 #include "token.h"
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7
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8 static PyCFunctionObject *free_list = NULL;
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9
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10 PyObject *
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11 PyCFunction_New(PyMethodDef *ml, PyObject *self)
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12 {
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13 PyCFunctionObject *op;
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14 op = free_list;
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15 if (op != NULL) {
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16 free_list = (PyCFunctionObject *)(op->m_self);
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17 PyObject_INIT(op, &PyCFunction_Type);
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18 }
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19 else {
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20 op = PyObject_NEW(PyCFunctionObject, &PyCFunction_Type);
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21 if (op == NULL)
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22 return NULL;
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23 }
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24 op->m_ml = ml;
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25 Py_XINCREF(self);
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26 op->m_self = self;
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27 PyObject_GC_Init(op);
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28 return (PyObject *)op;
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29 }
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30
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31 PyCFunction
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32 PyCFunction_GetFunction(PyObject *op)
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33 {
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34 if (!PyCFunction_Check(op)) {
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35 PyErr_BadInternalCall();
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36 return NULL;
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37 }
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38 return ((PyCFunctionObject *)op) -> m_ml -> ml_meth;
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39 }
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40
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41 PyObject *
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42 PyCFunction_GetSelf(PyObject *op)
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43 {
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44 if (!PyCFunction_Check(op)) {
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45 PyErr_BadInternalCall();
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46 return NULL;
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47 }
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48 return ((PyCFunctionObject *)op) -> m_self;
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49 }
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50
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51 int
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52 PyCFunction_GetFlags(PyObject *op)
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53 {
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54 if (!PyCFunction_Check(op)) {
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55 PyErr_BadInternalCall();
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56 return -1;
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57 }
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58 return ((PyCFunctionObject *)op) -> m_ml -> ml_flags;
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59 }
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60
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61 /* Methods (the standard built-in methods, that is) */
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62
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63 static void
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64 meth_dealloc(PyCFunctionObject *m)
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65 {
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66 PyObject_GC_Fini(m);
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67 Py_XDECREF(m->m_self);
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68 m->m_self = (PyObject *)free_list;
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69 free_list = m;
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70 }
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71
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72 static int
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73 meth_traverse(PyCFunctionObject *m, visitproc visit, void *arg)
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74 {
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75 if (m->m_self != NULL)
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76 return visit(m->m_self, arg);
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77 else
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78 return 0;
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79 }
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80
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81 static PyObject *
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82 meth_getattr(PyCFunctionObject *m, char *name)
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83 {
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84 if (strcmp(name, "__name__") == 0) {
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85 return PyString_FromString(m->m_ml->ml_name);
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86 }
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87 if (strcmp(name, "__doc__") == 0) {
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88 char *doc = m->m_ml->ml_doc;
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89 if (doc != NULL)
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90 return PyString_FromString(doc);
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91 Py_INCREF(Py_None);
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92 return Py_None;
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93 }
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94 if (strcmp(name, "__self__") == 0) {
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95 PyObject *self;
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96 if (PyEval_GetRestricted()) {
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97 PyErr_SetString(PyExc_RuntimeError,
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98 "method.__self__ not accessible in restricted mode");
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99 return NULL;
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100 }
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101 self = m->m_self;
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102 if (self == NULL)
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103 self = Py_None;
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104 Py_INCREF(self);
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105 return self;
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106 }
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107 if (strcmp(name, "__members__") == 0) {
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108 return Py_BuildValue("[sss]",
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109 "__doc__", "__name__", "__self__");
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110 }
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111 PyErr_SetString(PyExc_AttributeError, name);
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112 return NULL;
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113 }
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114
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115 static PyObject *
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116 meth_repr(PyCFunctionObject *m)
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117 {
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118 char buf[200];
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119 if (m->m_self == NULL)
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120 sprintf(buf, "<built-in function %.80s>", m->m_ml->ml_name);
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121 else
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122 sprintf(buf,
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123 "<built-in method %.80s of %.80s object at %p>",
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124 m->m_ml->ml_name, m->m_self->ob_type->tp_name,
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125 m->m_self);
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126 return PyString_FromString(buf);
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127 }
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128
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129 static int
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130 meth_compare(PyCFunctionObject *a, PyCFunctionObject *b)
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131 {
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132 if (a->m_self != b->m_self)
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133 return (a->m_self < b->m_self) ? -1 : 1;
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134 if (a->m_ml->ml_meth == b->m_ml->ml_meth)
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135 return 0;
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136 if (strcmp(a->m_ml->ml_name, b->m_ml->ml_name) < 0)
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137 return -1;
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138 else
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139 return 1;
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140 }
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141
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142 static long
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143 meth_hash(PyCFunctionObject *a)
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144 {
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145 long x,y;
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146 if (a->m_self == NULL)
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147 x = 0;
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148 else {
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149 x = PyObject_Hash(a->m_self);
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150 if (x == -1)
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151 return -1;
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152 }
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153 y = _Py_HashPointer((void*)(a->m_ml->ml_meth));
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154 if (y == -1)
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155 return -1;
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156 x ^= y;
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157 if (x == -1)
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158 x = -2;
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159 return x;
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160 }
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161
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162 PyTypeObject PyCFunction_Type = {
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163 PyObject_HEAD_INIT(&PyType_Type)
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164 0,
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165 "builtin_function_or_method",
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166 sizeof(PyCFunctionObject) + PyGC_HEAD_SIZE,
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167 0,
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168 (destructor)meth_dealloc, /* tp_dealloc */
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169 0, /* tp_print */
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170 (getattrfunc)meth_getattr, /* tp_getattr */
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171 0, /* tp_setattr */
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172 (cmpfunc)meth_compare, /* tp_compare */
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173 (reprfunc)meth_repr, /* tp_repr */
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174 0, /* tp_as_number */
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175 0, /* tp_as_sequence */
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176 0, /* tp_as_mapping */
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177 (hashfunc)meth_hash, /* tp_hash */
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178 0, /* tp_call */
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179 0, /* tp_str */
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180 0, /* tp_getattro */
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181 0, /* tp_setattro */
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182 0, /* tp_as_buffer */
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183 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_GC, /* tp_flags */
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184 0, /* tp_doc */
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185 (traverseproc)meth_traverse, /* tp_traverse */
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186 };
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187
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188 /* List all methods in a chain -- helper for findmethodinchain */
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189
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190 static PyObject *
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191 listmethodchain(PyMethodChain *chain)
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192 {
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193 PyMethodChain *c;
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194 PyMethodDef *ml;
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195 int i, n;
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196 PyObject *v;
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197
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198 n = 0;
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199 for (c = chain; c != NULL; c = c->link) {
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200 for (ml = c->methods; ml->ml_name != NULL; ml++)
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201 n++;
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202 }
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203 v = PyList_New(n);
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204 if (v == NULL)
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205 return NULL;
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206 i = 0;
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207 for (c = chain; c != NULL; c = c->link) {
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208 for (ml = c->methods; ml->ml_name != NULL; ml++) {
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209 PyList_SetItem(v, i, PyString_FromString(ml->ml_name));
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210 i++;
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211 }
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212 }
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213 if (PyErr_Occurred()) {
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214 Py_DECREF(v);
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215 return NULL;
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216 }
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217 PyList_Sort(v);
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218 return v;
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219 }
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220
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221 /* Find a method in a method chain */
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222
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223 PyObject *
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224 Py_FindMethodInChain(PyMethodChain *chain, PyObject *self, char *name)
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225 {
8565
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226 if (name[0] == '_' && name[1] == '_') {
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227 if (strcmp(name, "__methods__") == 0)
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228 return listmethodchain(chain);
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229 if (strcmp(name, "__doc__") == 0) {
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230 char *doc = self->ob_type->tp_doc;
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231 if (doc != NULL)
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232 return PyString_FromString(doc);
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233 }
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234 }
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235 while (chain != NULL) {
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236 PyMethodDef *ml = chain->methods;
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237 for (; ml->ml_name != NULL; ml++) {
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238 if (name[0] == ml->ml_name[0] &&
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239 strcmp(name+1, ml->ml_name+1) == 0)
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240 return PyCFunction_New(ml, self);
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241 }
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242 chain = chain->link;
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243 }
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244 PyErr_SetString(PyExc_AttributeError, name);
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245 return NULL;
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246 }
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247
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248 /* Find a method in a single method list */
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249
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250 PyObject *
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251 Py_FindMethod(PyMethodDef *methods, PyObject *self, char *name)
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252 {
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253 PyMethodChain chain;
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254 chain.methods = methods;
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255 chain.link = NULL;
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256 return Py_FindMethodInChain(&chain, self, name);
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257 }
5934
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258
0369d63b100b Added separate free list for cfunction (builtin method) objects, for a
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259 /* Clear out the free list */
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260
0369d63b100b Added separate free list for cfunction (builtin method) objects, for a
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261 void
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262 PyCFunction_Fini(void)
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diff changeset
263 {
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264 while (free_list) {
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265 PyCFunctionObject *v = free_list;
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266 free_list = (PyCFunctionObject *)(v->m_self);
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267 v = (PyCFunctionObject *) PyObject_AS_GC(v);
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268 PyObject_DEL(v);
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269 }
0369d63b100b Added separate free list for cfunction (builtin method) objects, for a
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270 }