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annotate Objects/cobject.c @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 4ee682fbec30
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /* Wrap void* pointers to be passed between C modules */
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3
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4 #include "Python.h"
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5
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6
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7 /* Declarations for objects of type PyCObject */
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8
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9 typedef void (*destructor1)(void *);
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10 typedef void (*destructor2)(void *, void*);
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11
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12 static int cobject_deprecation_warning(void)
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13 {
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14 return PyErr_WarnPy3k("CObject type is not supported in 3.x. "
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15 "Please use capsule objects instead.", 1);
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16 }
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17
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18
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19 PyObject *
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20 PyCObject_FromVoidPtr(void *cobj, void (*destr)(void *))
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21 {
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22 PyCObject *self;
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23
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24 if (cobject_deprecation_warning()) {
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25 return NULL;
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26 }
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27
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28 self = PyObject_NEW(PyCObject, &PyCObject_Type);
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29 if (self == NULL)
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30 return NULL;
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31 self->cobject=cobj;
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32 self->destructor=destr;
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33 self->desc=NULL;
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34
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35 return (PyObject *)self;
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36 }
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37
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38 PyObject *
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39 PyCObject_FromVoidPtrAndDesc(void *cobj, void *desc,
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40 void (*destr)(void *, void *))
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41 {
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42 PyCObject *self;
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43
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44 if (cobject_deprecation_warning()) {
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45 return NULL;
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46 }
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47
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48 if (!desc) {
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49 PyErr_SetString(PyExc_TypeError,
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50 "PyCObject_FromVoidPtrAndDesc called with null"
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51 " description");
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52 return NULL;
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53 }
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54 self = PyObject_NEW(PyCObject, &PyCObject_Type);
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55 if (self == NULL)
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56 return NULL;
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57 self->cobject = cobj;
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58 self->destructor = (destructor1)destr;
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59 self->desc = desc;
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60
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61 return (PyObject *)self;
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62 }
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63
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64 void *
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65 PyCObject_AsVoidPtr(PyObject *self)
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66 {
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67 if (self) {
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68 if (PyCapsule_CheckExact(self)) {
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69 const char *name = PyCapsule_GetName(self);
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70 return (void *)PyCapsule_GetPointer(self, name);
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71 }
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72 if (self->ob_type == &PyCObject_Type)
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73 return ((PyCObject *)self)->cobject;
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74 PyErr_SetString(PyExc_TypeError,
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75 "PyCObject_AsVoidPtr with non-C-object");
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76 }
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77 if (!PyErr_Occurred())
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78 PyErr_SetString(PyExc_TypeError,
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79 "PyCObject_AsVoidPtr called with null pointer");
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80 return NULL;
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81 }
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82
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83 void *
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84 PyCObject_GetDesc(PyObject *self)
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85 {
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86 if (self) {
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87 if (self->ob_type == &PyCObject_Type)
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88 return ((PyCObject *)self)->desc;
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89 PyErr_SetString(PyExc_TypeError,
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90 "PyCObject_GetDesc with non-C-object");
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91 }
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92 if (!PyErr_Occurred())
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93 PyErr_SetString(PyExc_TypeError,
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94 "PyCObject_GetDesc called with null pointer");
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95 return NULL;
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96 }
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97
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98 void *
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99 PyCObject_Import(char *module_name, char *name)
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100 {
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101 PyObject *m, *c;
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102 void *r = NULL;
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103
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104 if ((m = PyImport_ImportModule(module_name))) {
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105 if ((c = PyObject_GetAttrString(m,name))) {
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106 r = PyCObject_AsVoidPtr(c);
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107 Py_DECREF(c);
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108 }
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109 Py_DECREF(m);
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110 }
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111 return r;
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112 }
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113
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114 int
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115 PyCObject_SetVoidPtr(PyObject *self, void *cobj)
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116 {
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117 PyCObject* cself = (PyCObject*)self;
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118 if (cself == NULL || !PyCObject_Check(cself) ||
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119 cself->destructor != NULL) {
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120 PyErr_SetString(PyExc_TypeError,
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121 "Invalid call to PyCObject_SetVoidPtr");
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122 return 0;
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123 }
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124 cself->cobject = cobj;
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125 return 1;
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126 }
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127
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128 static void
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129 PyCObject_dealloc(PyCObject *self)
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130 {
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131 if (self->destructor) {
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132 if(self->desc)
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133 ((destructor2)(self->destructor))(self->cobject, self->desc);
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134 else
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135 (self->destructor)(self->cobject);
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136 }
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137 PyObject_DEL(self);
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138 }
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139
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140
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141 PyDoc_STRVAR(PyCObject_Type__doc__,
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142 "C objects to be exported from one extension module to another\n\
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143 \n\
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144 C objects are used for communication between extension modules. They\n\
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145 provide a way for an extension module to export a C interface to other\n\
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146 extension modules, so that extension modules can use the Python import\n\
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147 mechanism to link to one another.");
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148
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149 PyTypeObject PyCObject_Type = {
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150 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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151 "PyCObject", /*tp_name*/
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152 sizeof(PyCObject), /*tp_basicsize*/
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153 0, /*tp_itemsize*/
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154 /* methods */
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155 (destructor)PyCObject_dealloc, /*tp_dealloc*/
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156 0, /*tp_print*/
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157 0, /*tp_getattr*/
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158 0, /*tp_setattr*/
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159 0, /*tp_compare*/
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160 0, /*tp_repr*/
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161 0, /*tp_as_number*/
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162 0, /*tp_as_sequence*/
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163 0, /*tp_as_mapping*/
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164 0, /*tp_hash*/
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165 0, /*tp_call*/
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166 0, /*tp_str*/
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167 0, /*tp_getattro*/
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168 0, /*tp_setattro*/
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169 0, /*tp_as_buffer*/
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170 0, /*tp_flags*/
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171 PyCObject_Type__doc__ /*tp_doc*/
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172 };