Mercurial > cpython-lru_cache-weakref

annotate Objects/cellobject.c @ 70817:dd775b1561ba

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Fix markup.
author Georg Brandl <georg@python.org>
date Tue, 14 Jun 2011 21:09:55 +0200
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children
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1 /* Cell object implementation */
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2
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3 #include "Python.h"
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4
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5 PyObject *
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6 PyCell_New(PyObject *obj)
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7 {
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8 PyCellObject *op;
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9
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10 op = (PyCellObject *)PyObject_GC_New(PyCellObject, &PyCell_Type);
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11 if (op == NULL)
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12 return NULL;
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13 op->ob_ref = obj;
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14 Py_XINCREF(obj);
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15
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16 _PyObject_GC_TRACK(op);
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17 return (PyObject *)op;
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18 }
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19
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20 PyObject *
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21 PyCell_Get(PyObject *op)
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22 {
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23 if (!PyCell_Check(op)) {
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24 PyErr_BadInternalCall();
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25 return NULL;
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26 }
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27 Py_XINCREF(((PyCellObject*)op)->ob_ref);
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28 return PyCell_GET(op);
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29 }
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30
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31 int
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32 PyCell_Set(PyObject *op, PyObject *obj)
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33 {
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34 PyObject* oldobj;
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35 if (!PyCell_Check(op)) {
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36 PyErr_BadInternalCall();
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37 return -1;
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38 }
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39 oldobj = PyCell_GET(op);
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40 Py_XINCREF(obj);
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41 PyCell_SET(op, obj);
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42 Py_XDECREF(oldobj);
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43 return 0;
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44 }
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45
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46 static void
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47 cell_dealloc(PyCellObject *op)
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48 {
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49 _PyObject_GC_UNTRACK(op);
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50 Py_XDECREF(op->ob_ref);
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51 PyObject_GC_Del(op);
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52 }
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53
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54 #define TEST_COND(cond) ((cond) ? Py_True : Py_False)
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55
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56 static PyObject *
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57 cell_richcompare(PyObject *a, PyObject *b, int op)
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58 {
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59 int result;
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60 PyObject *v;
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61
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62 /* neither argument should be NULL, unless something's gone wrong */
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63 assert(a != NULL && b != NULL);
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64
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65 /* both arguments should be instances of PyCellObject */
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66 if (!PyCell_Check(a) || !PyCell_Check(b)) {
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67 v = Py_NotImplemented;
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68 Py_INCREF(v);
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69 return v;
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70 }
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71
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72 /* compare cells by contents; empty cells come before anything else */
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73 a = ((PyCellObject *)a)->ob_ref;
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74 b = ((PyCellObject *)b)->ob_ref;
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75 if (a != NULL && b != NULL)
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76 return PyObject_RichCompare(a, b, op);
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77
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78 result = (b == NULL) - (a == NULL);
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79 switch (op) {
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80 case Py_EQ:
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81 v = TEST_COND(result == 0);
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82 break;
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83 case Py_NE:
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84 v = TEST_COND(result != 0);
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85 break;
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86 case Py_LE:
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87 v = TEST_COND(result <= 0);
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88 break;
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89 case Py_GE:
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90 v = TEST_COND(result >= 0);
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91 break;
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92 case Py_LT:
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93 v = TEST_COND(result < 0);
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94 break;
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95 case Py_GT:
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96 v = TEST_COND(result > 0);
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97 break;
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98 default:
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99 PyErr_BadArgument();
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100 return NULL;
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101 }
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102 Py_INCREF(v);
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103 return v;
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104 }
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105
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106 static PyObject *
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107 cell_repr(PyCellObject *op)
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108 {
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109 if (op->ob_ref == NULL)
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110 return PyUnicode_FromFormat("<cell at %p: empty>", op);
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111
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112 return PyUnicode_FromFormat("<cell at %p: %.80s object at %p>",
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113 op, op->ob_ref->ob_type->tp_name,
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114 op->ob_ref);
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115 }
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116
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117 static int
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118 cell_traverse(PyCellObject *op, visitproc visit, void *arg)
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119 {
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120 Py_VISIT(op->ob_ref);
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121 return 0;
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122 }
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123
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124 static int
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125 cell_clear(PyCellObject *op)
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126 {
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127 Py_CLEAR(op->ob_ref);
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128 return 0;
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129 }
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130
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131 static PyObject *
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132 cell_get_contents(PyCellObject *op, void *closure)
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133 {
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134 if (op->ob_ref == NULL)
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135 {
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136 PyErr_SetString(PyExc_ValueError, "Cell is empty");
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137 return NULL;
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138 }
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139 Py_INCREF(op->ob_ref);
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140 return op->ob_ref;
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141 }
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142
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143 static PyGetSetDef cell_getsetlist[] = {
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144 {"cell_contents", (getter)cell_get_contents, NULL},
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145 {NULL} /* sentinel */
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146 };
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147
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148 PyTypeObject PyCell_Type = {
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149 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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150 "cell",
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151 sizeof(PyCellObject),
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152 0,
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153 (destructor)cell_dealloc, /* tp_dealloc */
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154 0, /* tp_print */
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155 0, /* tp_getattr */
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156 0, /* tp_setattr */
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157 0, /* tp_reserved */
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158 (reprfunc)cell_repr, /* tp_repr */
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159 0, /* tp_as_number */
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160 0, /* tp_as_sequence */
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161 0, /* tp_as_mapping */
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162 0, /* tp_hash */
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163 0, /* tp_call */
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164 0, /* tp_str */
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165 PyObject_GenericGetAttr, /* tp_getattro */
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166 0, /* tp_setattro */
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167 0, /* tp_as_buffer */
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168 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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169 0, /* tp_doc */
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170 (traverseproc)cell_traverse, /* tp_traverse */
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171 (inquiry)cell_clear, /* tp_clear */
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172 cell_richcompare, /* tp_richcompare */
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173 0, /* tp_weaklistoffset */
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174 0, /* tp_iter */
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175 0, /* tp_iternext */
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176 0, /* tp_methods */
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177 0, /* tp_members */
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178 cell_getsetlist, /* tp_getset */
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179 };