Mercurial > cpython-lru_cache-weakref

annotate Modules/_sqlite/microprotocols.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 4c77d1016f60
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* microprotocols.c - minimalist and non-validating protocols implementation
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2 *
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3 * Copyright (C) 2003-2004 Federico Di Gregorio <fog@debian.org>
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4 *
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5 * This file is part of psycopg and was adapted for pysqlite. Federico Di
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6 * Gregorio gave the permission to use it within pysqlite under the following
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7 * license:
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8 *
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9 * This software is provided 'as-is', without any express or implied
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10 * warranty. In no event will the authors be held liable for any damages
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11 * arising from the use of this software.
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12 *
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13 * Permission is granted to anyone to use this software for any purpose,
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14 * including commercial applications, and to alter it and redistribute it
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15 * freely, subject to the following restrictions:
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16 *
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17 * 1. The origin of this software must not be misrepresented; you must not
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18 * claim that you wrote the original software. If you use this software
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19 * in a product, an acknowledgment in the product documentation would be
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20 * appreciated but is not required.
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21 * 2. Altered source versions must be plainly marked as such, and must not be
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22 * misrepresented as being the original software.
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23 * 3. This notice may not be removed or altered from any source distribution.
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24 */
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25
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26 #include <Python.h>
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27 #include <structmember.h>
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28
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29 #include "cursor.h"
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30 #include "microprotocols.h"
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31 #include "prepare_protocol.h"
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32
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33
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34 /** the adapters registry **/
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35
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36 PyObject *psyco_adapters;
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37
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38 /* pysqlite_microprotocols_init - initialize the adapters dictionary */
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39
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40 int
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41 pysqlite_microprotocols_init(PyObject *dict)
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42 {
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43 /* create adapters dictionary and put it in module namespace */
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44 if ((psyco_adapters = PyDict_New()) == NULL) {
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45 return -1;
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46 }
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47
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48 return PyDict_SetItemString(dict, "adapters", psyco_adapters);
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49 }
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50
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51
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52 /* pysqlite_microprotocols_add - add a reverse type-caster to the dictionary */
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53
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54 int
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55 pysqlite_microprotocols_add(PyTypeObject *type, PyObject *proto, PyObject *cast)
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56 {
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57 PyObject* key;
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58 int rc;
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59
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60 if (proto == NULL) proto = (PyObject*)&pysqlite_PrepareProtocolType;
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61
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62 key = Py_BuildValue("(OO)", (PyObject*)type, proto);
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63 if (!key) {
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64 return -1;
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65 }
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66
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67 rc = PyDict_SetItem(psyco_adapters, key, cast);
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68 Py_DECREF(key);
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69
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70 return rc;
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71 }
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72
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73 /* pysqlite_microprotocols_adapt - adapt an object to the built-in protocol */
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74
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75 PyObject *
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76 pysqlite_microprotocols_adapt(PyObject *obj, PyObject *proto, PyObject *alt)
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77 {
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78 PyObject *adapter, *key;
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79
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80 /* we don't check for exact type conformance as specified in PEP 246
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81 because the pysqlite_PrepareProtocolType type is abstract and there is no
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82 way to get a quotable object to be its instance */
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83
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84 /* look for an adapter in the registry */
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85 key = Py_BuildValue("(OO)", (PyObject*)obj->ob_type, proto);
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86 if (!key) {
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87 return NULL;
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88 }
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89 adapter = PyDict_GetItem(psyco_adapters, key);
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90 Py_DECREF(key);
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91 if (adapter) {
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92 PyObject *adapted = PyObject_CallFunctionObjArgs(adapter, obj, NULL);
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93 return adapted;
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94 }
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95
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96 /* try to have the protocol adapt this object*/
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97 if (PyObject_HasAttrString(proto, "__adapt__")) {
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98 PyObject *adapted = PyObject_CallMethod(proto, "__adapt__", "O", obj);
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99 if (adapted) {
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100 if (adapted != Py_None) {
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101 return adapted;
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102 } else {
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103 Py_DECREF(adapted);
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104 }
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105 }
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106
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107 if (PyErr_Occurred() && !PyErr_ExceptionMatches(PyExc_TypeError))
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108 return NULL;
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109 }
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110
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111 /* and finally try to have the object adapt itself */
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112 if (PyObject_HasAttrString(obj, "__conform__")) {
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113 PyObject *adapted = PyObject_CallMethod(obj, "__conform__","O", proto);
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114 if (adapted) {
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115 if (adapted != Py_None) {
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116 return adapted;
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117 } else {
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118 Py_DECREF(adapted);
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119 }
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120 }
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121
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122 if (PyErr_Occurred() && !PyErr_ExceptionMatches(PyExc_TypeError)) {
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123 return NULL;
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124 }
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125 }
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126
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127 /* else set the right exception and return NULL */
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128 PyErr_SetString(pysqlite_ProgrammingError, "can't adapt");
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129 return NULL;
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130 }
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131
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132 /** module-level functions **/
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133
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134 PyObject *
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135 pysqlite_adapt(pysqlite_Cursor *self, PyObject *args)
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136 {
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137 PyObject *obj, *alt = NULL;
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138 PyObject *proto = (PyObject*)&pysqlite_PrepareProtocolType;
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139
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140 if (!PyArg_ParseTuple(args, "O|OO", &obj, &proto, &alt)) return NULL;
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141 return pysqlite_microprotocols_adapt(obj, proto, alt);
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142 }