Mercurial > cpython-lru_cache-weakref

annotate Objects/cobject.c @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
parents 6f6f965c5e2d
children ed1ba37a46b7
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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 typedef struct {
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13 PyObject_HEAD
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14 void *cobject;
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15 void *desc;
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16 void (*destructor)(void *);
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17 } PyCObject;
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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 self = PyObject_NEW(PyCObject, &PyCObject_Type);
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25 if (self == NULL)
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26 return NULL;
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27 self->cobject=cobj;
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28 self->destructor=destr;
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29 self->desc=NULL;
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30
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31 return (PyObject *)self;
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32 }
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33
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34 PyObject *
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35 PyCObject_FromVoidPtrAndDesc(void *cobj, void *desc,
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36 void (*destr)(void *, void *))
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37 {
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38 PyCObject *self;
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39
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40 if (!desc) {
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41 PyErr_SetString(PyExc_TypeError,
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42 "PyCObject_FromVoidPtrAndDesc called with null"
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43 " description");
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44 return NULL;
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45 }
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46 self = PyObject_NEW(PyCObject, &PyCObject_Type);
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47 if (self == NULL)
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48 return NULL;
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49 self->cobject=cobj;
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50 self->destructor=(destructor1)destr;
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51 self->desc=desc;
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52
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53 return (PyObject *)self;
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54 }
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55
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56 void *
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57 PyCObject_AsVoidPtr(PyObject *self)
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58 {
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59 if (self) {
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60 if (self->ob_type == &PyCObject_Type)
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61 return ((PyCObject *)self)->cobject;
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62 PyErr_SetString(PyExc_TypeError,
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63 "PyCObject_AsVoidPtr with non-C-object");
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64 }
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65 if (!PyErr_Occurred())
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66 PyErr_SetString(PyExc_TypeError,
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67 "PyCObject_AsVoidPtr called with null pointer");
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68 return NULL;
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69 }
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70
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71 void *
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72 PyCObject_GetDesc(PyObject *self)
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73 {
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74 if (self) {
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75 if (self->ob_type == &PyCObject_Type)
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76 return ((PyCObject *)self)->desc;
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77 PyErr_SetString(PyExc_TypeError,
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78 "PyCObject_GetDesc with non-C-object");
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79 }
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80 if (!PyErr_Occurred())
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81 PyErr_SetString(PyExc_TypeError,
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82 "PyCObject_GetDesc called with null pointer");
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83 return NULL;
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84 }
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85
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86 void *
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87 PyCObject_Import(char *module_name, char *name)
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88 {
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89 PyObject *m, *c;
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90 void *r = NULL;
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91
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92 if ((m = PyImport_ImportModule(module_name))) {
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93 if ((c = PyObject_GetAttrString(m,name))) {
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94 r = PyCObject_AsVoidPtr(c);
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95 Py_DECREF(c);
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96 }
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97 Py_DECREF(m);
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98 }
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99 return r;
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100 }
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101
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102 static void
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103 PyCObject_dealloc(PyCObject *self)
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104 {
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105 if (self->destructor) {
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106 if(self->desc)
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107 ((destructor2)(self->destructor))(self->cobject, self->desc);
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108 else
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109 (self->destructor)(self->cobject);
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110 }
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111 PyObject_DEL(self);
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112 }
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113
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114
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115 static char PyCObject_Type__doc__[] =
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116 "C objects to be exported from one extension module to another\n\
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117 \n\
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118 C objects are used for communication between extension modules. They\n\
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119 provide a way for an extension module to export a C interface to other\n\
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120 extension modules, so that extension modules can use the Python import\n\
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121 mechanism to link to one another.";
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122
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123 PyTypeObject PyCObject_Type = {
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124 PyObject_HEAD_INIT(&PyType_Type)
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125 0, /*ob_size*/
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126 "PyCObject", /*tp_name*/
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127 sizeof(PyCObject), /*tp_basicsize*/
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128 0, /*tp_itemsize*/
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129 /* methods */
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130 (destructor)PyCObject_dealloc, /*tp_dealloc*/
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131 (printfunc)0, /*tp_print*/
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132 (getattrfunc)0, /*tp_getattr*/
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133 (setattrfunc)0, /*tp_setattr*/
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134 (cmpfunc)0, /*tp_compare*/
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135 (reprfunc)0, /*tp_repr*/
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136 0, /*tp_as_number*/
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137 0, /*tp_as_sequence*/
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138 0, /*tp_as_mapping*/
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139 (hashfunc)0, /*tp_hash*/
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140 (ternaryfunc)0, /*tp_call*/
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141 (reprfunc)0, /*tp_str*/
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142
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143 /* Space for future expansion */
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144 0L,0L,0L,0L,
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145 PyCObject_Type__doc__ /* Documentation string */
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146 };