Mercurial > cpython-lru_cache-weakref

annotate Objects/funcobject.c @ 6719:faebc1940432 legacy-trunk

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author Guido van Rossum <guido@python.org>
date Tue, 02 Dec 1997 20:38:11 +0000
parents 75b3aabcb7c1
children 09963a2a24db
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* Function object implementation */
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33
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34 #include "Python.h"
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35 #include "compile.h"
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36 #include "structmember.h"
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37
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38 PyObject *
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39 PyFunction_New(code, globals)
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40 PyObject *code;
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41 PyObject *globals;
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42 {
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43 PyFunctionObject *op = PyObject_NEW(PyFunctionObject,
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44 &PyFunction_Type);
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45 if (op != NULL) {
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46 PyObject *doc;
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47 PyObject *consts;
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48 Py_INCREF(code);
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49 op->func_code = code;
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50 Py_INCREF(globals);
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51 op->func_globals = globals;
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52 op->func_name = ((PyCodeObject *)code)->co_name;
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53 Py_INCREF(op->func_name);
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54 op->func_defaults = NULL; /* No default arguments */
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55 consts = ((PyCodeObject *)code)->co_consts;
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56 if (PyTuple_Size(consts) >= 1) {
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57 doc = PyTuple_GetItem(consts, 0);
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58 if (!PyString_Check(doc))
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59 doc = Py_None;
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60 }
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61 else
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62 doc = Py_None;
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63 Py_INCREF(doc);
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64 op->func_doc = doc;
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65 }
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66 return (PyObject *)op;
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67 }
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68
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69 PyObject *
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70 PyFunction_GetCode(op)
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71 PyObject *op;
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72 {
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73 if (!PyFunction_Check(op)) {
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74 PyErr_BadInternalCall();
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75 return NULL;
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76 }
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77 return ((PyFunctionObject *) op) -> func_code;
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78 }
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79
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80 PyObject *
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81 PyFunction_GetGlobals(op)
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82 PyObject *op;
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83 {
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84 if (!PyFunction_Check(op)) {
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85 PyErr_BadInternalCall();
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86 return NULL;
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87 }
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88 return ((PyFunctionObject *) op) -> func_globals;
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89 }
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90
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91 PyObject *
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92 PyFunction_GetDefaults(op)
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93 PyObject *op;
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94 {
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95 if (!PyFunction_Check(op)) {
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96 PyErr_BadInternalCall();
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97 return NULL;
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98 }
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99 return ((PyFunctionObject *) op) -> func_defaults;
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100 }
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101
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102 int
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103 PyFunction_SetDefaults(op, defaults)
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104 PyObject *op;
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105 PyObject *defaults;
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106 {
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107 if (!PyFunction_Check(op)) {
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108 PyErr_BadInternalCall();
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109 return -1;
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110 }
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111 if (defaults == Py_None)
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112 defaults = NULL;
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113 else if (PyTuple_Check(defaults))
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114 Py_XINCREF(defaults);
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115 else {
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116 PyErr_SetString(PyExc_SystemError, "non-tuple default args");
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117 return -1;
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118 }
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119 Py_XDECREF(((PyFunctionObject *) op) -> func_defaults);
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120 ((PyFunctionObject *) op) -> func_defaults = defaults;
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121 return 0;
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122 }
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123
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124 /* Methods */
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125
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126 #define OFF(x) offsetof(PyFunctionObject, x)
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127
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128 static struct memberlist func_memberlist[] = {
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129 {"func_code", T_OBJECT, OFF(func_code), READONLY},
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130 {"func_globals",T_OBJECT, OFF(func_globals), READONLY},
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131 {"func_name", T_OBJECT, OFF(func_name), READONLY},
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132 {"__name__", T_OBJECT, OFF(func_name), READONLY},
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133 {"func_defaults",T_OBJECT, OFF(func_defaults), READONLY},
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134 {"func_doc", T_OBJECT, OFF(func_doc)},
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135 {"__doc__", T_OBJECT, OFF(func_doc)},
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136 {NULL} /* Sentinel */
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137 };
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138
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139 static PyObject *
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140 func_getattr(op, name)
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141 PyFunctionObject *op;
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142 char *name;
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143 {
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144 if (name[0] != '_' && PyEval_GetRestricted()) {
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145 PyErr_SetString(PyExc_RuntimeError,
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146 "function attributes not accessible in restricted mode");
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147 return NULL;
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148 }
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149 return PyMember_Get((char *)op, func_memberlist, name);
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150 }
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151
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152 static void
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153 func_dealloc(op)
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154 PyFunctionObject *op;
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155 {
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156 Py_DECREF(op->func_code);
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157 Py_DECREF(op->func_globals);
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158 Py_DECREF(op->func_name);
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159 Py_XDECREF(op->func_defaults);
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160 Py_XDECREF(op->func_doc);
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161 PyMem_DEL(op);
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162 }
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163
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164 static PyObject*
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165 func_repr(op)
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166 PyFunctionObject *op;
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167 {
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168 char buf[140];
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169 if (op->func_name == Py_None)
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170 sprintf(buf, "<anonymous function at %lx>", (long)op);
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171 else
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172 sprintf(buf, "<function %.100s at %lx>",
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173 PyString_AsString(op->func_name),
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174 (long)op);
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175 return PyString_FromString(buf);
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176 }
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177
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178 static int
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179 func_compare(f, g)
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180 PyFunctionObject *f, *g;
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181 {
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182 int c;
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183 if (f->func_globals != g->func_globals)
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184 return (f->func_globals < g->func_globals) ? -1 : 1;
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185 if (f->func_defaults != g->func_defaults) {
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186 if (f->func_defaults == NULL)
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187 return -1;
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188 if (g->func_defaults == NULL)
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189 return 1;
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190 c = PyObject_Compare(f->func_defaults, g->func_defaults);
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191 if (c != 0)
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192 return c;
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193 }
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194 return PyObject_Compare(f->func_code, g->func_code);
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195 }
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196
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197 static long
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198 func_hash(f)
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199 PyFunctionObject *f;
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200 {
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201 long h;
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202 h = PyObject_Hash(f->func_code);
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203 if (h == -1) return h;
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204 h = h ^ (long)f->func_globals;
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205 if (h == -1) h = -2;
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206 return h;
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207 }
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208
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209 PyTypeObject PyFunction_Type = {
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210 PyObject_HEAD_INIT(&PyType_Type)
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211 0,
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212 "function",
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213 sizeof(PyFunctionObject),
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214 0,
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215 (destructor)func_dealloc, /*tp_dealloc*/
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216 0, /*tp_print*/
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217 (getattrfunc)func_getattr, /*tp_getattr*/
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218 0, /*tp_setattr*/
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219 (cmpfunc)func_compare, /*tp_compare*/
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220 (reprfunc)func_repr, /*tp_repr*/
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221 0, /*tp_as_number*/
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222 0, /*tp_as_sequence*/
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223 0, /*tp_as_mapping*/
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224 (hashfunc)func_hash, /*tp_hash*/
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225 };