1 | /** @file
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2 | * MS COM / XPCOM Abstraction Layer - Smart COM pointer classes declaration.
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3 | */
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4 |
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5 | /*
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6 | * Copyright (C) 2006-2022 Oracle and/or its affiliates.
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7 | *
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8 | * This file is part of VirtualBox base platform packages, as
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9 | * available from https://www.virtualbox.org.
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10 | *
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11 | * This program is free software; you can redistribute it and/or
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12 | * modify it under the terms of the GNU General Public License
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13 | * as published by the Free Software Foundation, in version 3 of the
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14 | * License.
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15 | *
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16 | * This program is distributed in the hope that it will be useful, but
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17 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 | * General Public License for more details.
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20 | *
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21 | * You should have received a copy of the GNU General Public License
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22 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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23 | *
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24 | * The contents of this file may alternatively be used under the terms
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25 | * of the Common Development and Distribution License Version 1.0
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26 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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27 | * in the VirtualBox distribution, in which case the provisions of the
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28 | * CDDL are applicable instead of those of the GPL.
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29 | *
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30 | * You may elect to license modified versions of this file under the
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31 | * terms and conditions of either the GPL or the CDDL or both.
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32 | *
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33 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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34 | */
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35 |
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36 | #ifndef VBOX_INCLUDED_com_ptr_h
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37 | #define VBOX_INCLUDED_com_ptr_h
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38 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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39 | # pragma once
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40 | #endif
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41 |
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42 | /* Make sure all the stdint.h macros are included - must come first! */
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43 | #ifndef __STDC_LIMIT_MACROS
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44 | # define __STDC_LIMIT_MACROS
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45 | #endif
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46 | #ifndef __STDC_CONSTANT_MACROS
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47 | # define __STDC_CONSTANT_MACROS
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48 | #endif
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49 |
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50 | #ifdef VBOX_WITH_XPCOM
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51 | # include <nsISupportsUtils.h>
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52 | #endif /* VBOX_WITH_XPCOM */
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53 |
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54 | #include <VBox/com/defs.h>
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55 | #include <new> /* For bad_alloc. */
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56 |
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57 |
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58 | /** @defgroup grp_com_ptr Smart COM Pointer Classes
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59 | * @ingroup grp_com
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60 | * @{
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61 | */
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62 |
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63 | #ifdef VBOX_WITH_XPCOM
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64 |
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65 | namespace com
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66 | {
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67 | // declare a couple of XPCOM helper methods (defined in glue/com.cpp)
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68 | // so we don't have to include a ton of XPCOM implementation headers here
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69 | HRESULT GlueCreateObjectOnServer(const CLSID &clsid,
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70 | const char *serverName,
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71 | const nsIID &id,
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72 | void **ppobj);
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73 | HRESULT GlueCreateInstance(const CLSID &clsid,
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74 | const nsIID &id,
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75 | void **ppobj);
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76 | }
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77 |
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78 | #endif // VBOX_WITH_XPCOM
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79 |
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80 | /**
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81 | * COM autopointer class which takes care of all required reference counting.
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82 | *
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83 | * This automatically calls the required basic COM methods on COM pointers
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84 | * given to it:
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85 | *
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86 | * -- AddRef() gets called automatically whenever a new COM pointer is assigned
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87 | * to the ComPtr instance (either in the copy constructor or by assignment);
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88 | *
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89 | * -- Release() gets called automatically by the destructor and when an existing
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90 | * object gets released in assignment;
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91 | *
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92 | * -- QueryInterface() gets called automatically when COM pointers get converted
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93 | * from one interface to another.
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94 | *
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95 | * Example usage:
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96 | *
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97 | * @code
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98 | *
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99 | * {
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100 | * ComPtr<IMachine> pMachine = findMachine("blah"); // calls AddRef()
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101 | * ComPtr<IUnknown> pUnknown = pMachine; // calls QueryInterface()
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102 | * } # ComPtr destructor of both instances calls Release()
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103 | *
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104 | * @endcode
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105 | */
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106 | template <class T>
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107 | class ComPtr
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108 | {
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109 | public:
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110 |
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111 | /**
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112 | * Default constructor, sets up a NULL pointer.
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113 | */
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114 | ComPtr()
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115 | : m_p(NULL)
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116 | { }
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117 |
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118 | /**
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119 | * Destructor. Calls Release() on the contained COM object.
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120 | */
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121 | ~ComPtr()
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122 | {
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123 | cleanup();
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124 | }
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125 |
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126 | /**
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127 | * Copy constructor from another ComPtr of any interface.
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128 | *
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129 | * This calls QueryInterface(T) and can result in a NULL pointer if the input
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130 | * pointer p does not support the ComPtr interface T.
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131 | *
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132 | * Does not call AddRef explicitly because if QueryInterface succeeded, then
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133 | * the refcount will have been increased by one already.
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134 | */
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135 | template <class T2>
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136 | ComPtr(const ComPtr<T2> &that)
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137 | {
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138 | m_p = NULL;
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139 | if (!that.isNull())
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140 | that->QueryInterface(COM_IIDOF(T), (void **)&m_p);
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141 | }
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142 |
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143 | /**
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144 | * Specialization: copy constructor from another ComPtr<T>. Calls AddRef().
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145 | */
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146 | ComPtr(const ComPtr &that)
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147 | {
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148 | copyFrom(that.m_p);
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149 | }
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150 |
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151 | /**
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152 | * Copy constructor from another interface pointer of any interface.
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153 | *
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154 | * This calls QueryInterface(T) and can result in a NULL pointer if the input
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155 | * pointer p does not support the ComPtr interface T.
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156 | *
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157 | * Does not call AddRef explicitly because if QueryInterface succeeded, then
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158 | * the refcount will have been increased by one already.
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159 | */
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160 | template <class T2>
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161 | ComPtr(T2 *p)
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162 | {
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163 | m_p = NULL;
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164 | if (p)
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165 | p->QueryInterface(COM_IIDOF(T), (void **)&m_p);
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166 | }
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167 |
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168 | /**
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169 | * Specialization: copy constructor from a plain T * pointer. Calls AddRef().
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170 | */
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171 | ComPtr(T *that_p)
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172 | {
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173 | copyFrom(that_p);
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174 | }
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175 |
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176 | /**
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177 | * Assignment from another ComPtr of any interface.
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178 | *
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179 | * This calls QueryInterface(T) and can result in a NULL pointer if the input
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180 | * pointer p does not support the ComPtr interface T.
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181 | *
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182 | * Does not call AddRef explicitly because if QueryInterface succeeded, then
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183 | * the refcount will have been increased by one already.
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184 | */
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185 | template <class T2>
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186 | ComPtr& operator=(const ComPtr<T2> &that)
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187 | {
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188 | return operator=((T2 *)that);
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189 | }
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190 |
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191 | /**
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192 | * Specialization of the previous: assignment from another ComPtr<T>.
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193 | * Calls Release() on the previous member pointer, if any, and AddRef() on the new one.
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194 | */
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195 | ComPtr& operator=(const ComPtr &that)
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196 | {
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197 | return operator=((T *)that);
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198 | }
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199 |
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200 | /**
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201 | * Assignment from another interface pointer of any interface.
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202 | *
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203 | * This calls QueryInterface(T) and can result in a NULL pointer if the input
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204 | * pointer p does not support the ComPtr interface T.
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205 | *
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206 | * Does not call AddRef explicitly because if QueryInterface succeeded, then
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207 | * the refcount will have been increased by one already.
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208 | */
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209 | template <class T2>
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210 | ComPtr& operator=(T2 *p)
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211 | {
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212 | cleanup();
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213 | if (p)
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214 | p->QueryInterface(COM_IIDOF(T), (void **)&m_p);
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215 | return *this;
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216 | }
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217 |
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218 | /**
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219 | * Specialization of the previous: assignment from a plain T * pointer.
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220 | * Calls Release() on the previous member pointer, if any, and AddRef() on the new one.
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221 | */
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222 | ComPtr& operator=(T *p)
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223 | {
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224 | cleanup();
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225 | copyFrom(p);
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226 | return *this;
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227 | }
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228 |
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229 | /**
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230 | * Resets the ComPtr to NULL. Works like a NULL assignment except it avoids the templates.
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231 | */
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232 | void setNull()
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233 | {
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234 | cleanup();
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235 | }
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236 |
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237 | /**
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238 | * Returns true if the pointer is NULL.
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239 | */
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240 | bool isNull() const
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241 | {
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242 | return (m_p == NULL);
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243 | }
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244 |
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245 | /**
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246 | * Returns true if the pointer is not NULL.
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247 | */
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248 | bool isNotNull() const
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249 | {
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250 | return (m_p != NULL);
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251 | }
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252 |
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253 | bool operator<(T *p) const
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254 | {
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255 | return m_p < p;
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256 | }
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257 |
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258 | /**
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259 | * Conversion operator, most often used to pass ComPtr instances as
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260 | * parameters to COM method calls.
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261 | */
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262 | operator T *() const
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263 | {
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264 | return m_p;
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265 | }
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266 |
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267 | /**
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268 | * Dereferences the instance (redirects the -> operator to the managed
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269 | * pointer).
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270 | */
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271 | T *operator->() const
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272 | {
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273 | return m_p;
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274 | }
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275 |
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276 | /**
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277 | * Special method which allows using a ComPtr as an output argument of a COM method.
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278 | * The ComPtr will then accept the method's interface pointer without calling AddRef()
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279 | * itself, since by COM convention this must has been done by the method which created
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280 | * the object that is being accepted.
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281 | *
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282 | * The ComPtr destructor will then still invoke Release() so that the returned object
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283 | * can get cleaned up properly.
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284 | */
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285 | T **asOutParam()
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286 | {
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287 | cleanup();
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288 | return &m_p;
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289 | }
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290 |
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291 | /**
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292 | * Converts the contained pointer to a different interface
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293 | * by calling QueryInterface() on it.
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294 | * @param pp
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295 | * @return
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296 | */
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297 | template <class T2>
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298 | HRESULT queryInterfaceTo(T2 **pp) const
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299 | {
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300 | if (pp)
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301 | {
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302 | if (m_p)
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303 | return m_p->QueryInterface(COM_IIDOF(T2), (void **)pp);
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304 | *pp = NULL;
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305 | return S_OK;
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306 | }
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307 | return E_INVALIDARG;
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308 | }
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309 |
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310 | /**
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311 | * Equality test operator. By COM definition, two COM objects are considered
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312 | * equal if their IUnknown interface pointers are equal.
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313 | */
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314 | template <class T2>
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315 | bool operator==(T2 *p)
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316 | {
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317 | IUnknown *p1 = NULL;
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318 | bool fNeedsRelease1 = false;
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319 | if (m_p)
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320 | fNeedsRelease1 = (SUCCEEDED(m_p->QueryInterface(COM_IIDOF(IUnknown), (void **)&p1)));
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321 |
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322 | IUnknown *p2 = NULL;
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323 | bool fNeedsRelease2 = false;
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324 | if (p)
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325 | fNeedsRelease2 = (SUCCEEDED(p->QueryInterface(COM_IIDOF(IUnknown), (void **)&p2)));
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326 |
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327 | bool f = p1 == p2;
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328 | if (fNeedsRelease1)
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329 | p1->Release();
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330 | if (fNeedsRelease2)
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331 | p2->Release();
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332 | return f;
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333 | }
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334 |
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335 | /**
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336 | * Creates an in-process object of the given class ID and starts to
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337 | * manage a reference to the created object in case of success.
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338 | */
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339 | HRESULT createInprocObject(const CLSID &clsid)
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340 | {
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341 | HRESULT rc;
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342 | T *obj = NULL;
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343 | #ifndef VBOX_WITH_XPCOM
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344 | rc = CoCreateInstance(clsid, NULL, CLSCTX_INPROC_SERVER, COM_IIDOF(T),
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345 | (void **)&obj);
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346 | #else /* VBOX_WITH_XPCOM */
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347 | using namespace com;
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348 | rc = GlueCreateInstance(clsid, NS_GET_IID(T), (void **)&obj);
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349 | #endif /* VBOX_WITH_XPCOM */
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350 | *this = obj;
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351 | if (SUCCEEDED(rc))
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352 | obj->Release();
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353 | return rc;
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354 | }
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355 |
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356 | /**
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357 | * Creates a local (out-of-process) object of the given class ID and starts
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358 | * to manage a reference to the created object in case of success.
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359 | *
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360 | * Note: In XPCOM, the out-of-process functionality is currently emulated
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361 | * through in-process wrapper objects (that start a dedicated process and
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362 | * redirect all object requests to that process). For this reason, this
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363 | * method is fully equivalent to #createInprocObject() for now.
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364 | */
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365 | HRESULT createLocalObject(const CLSID &clsid)
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366 | {
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367 | #ifndef VBOX_WITH_XPCOM
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368 | HRESULT rc;
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369 | T *obj = NULL;
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370 | rc = CoCreateInstance(clsid, NULL, CLSCTX_LOCAL_SERVER, COM_IIDOF(T),
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371 | (void **)&obj);
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372 | *this = obj;
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373 | if (SUCCEEDED(rc))
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374 | obj->Release();
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375 | return rc;
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376 | #else /* VBOX_WITH_XPCOM */
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377 | return createInprocObject(clsid);
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378 | #endif /* VBOX_WITH_XPCOM */
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379 | }
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380 |
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381 | #ifdef VBOX_WITH_XPCOM
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382 | /**
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383 | * Creates an object of the given class ID on the specified server and
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384 | * starts to manage a reference to the created object in case of success.
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385 | *
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386 | * @param serverName Name of the server to create an object within.
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387 | */
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388 | HRESULT createObjectOnServer(const CLSID &clsid, const char *serverName)
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389 | {
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390 | T *obj = NULL;
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391 | HRESULT rc = GlueCreateObjectOnServer(clsid, serverName, NS_GET_IID(T), (void **)&obj);
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392 | *this = obj;
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393 | if (SUCCEEDED(rc))
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394 | obj->Release();
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395 | return rc;
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396 | }
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397 | #endif
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398 |
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399 | protected:
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400 | void copyFrom(T *p)
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401 | {
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402 | m_p = p;
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403 | if (m_p)
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404 | m_p->AddRef();
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405 | }
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406 |
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407 | void cleanup()
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408 | {
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409 | if (m_p)
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410 | {
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411 | m_p->Release();
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412 | m_p = NULL;
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413 | }
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414 | }
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415 |
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416 | public:
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417 | // Do NOT access this member unless you really know what you're doing!
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418 | T *m_p;
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419 | };
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420 |
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421 | /**
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422 | * ComObjPtr is a more specialized variant of ComPtr designed to be used for implementation
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423 | * objects. For example, use ComPtr<IMachine> for a client pointer that calls the interface
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424 | * but ComObjPtr<Machine> for a pointer to an implementation object.
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425 | *
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426 | * The methods behave the same except that ComObjPtr has the additional createObject()
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427 | * method which allows for instantiating a new implementation object.
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428 | *
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429 | * Note: To convert a ComObjPtr<InterfaceImpl> to a ComObj<IInterface> you have
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430 | * to query the interface. See the following example code for the IProgress
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431 | * interface:
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432 | *
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433 | * @code
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434 | *
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435 | * {
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436 | * ComObjPtr<Progress> pProgress; // create the server side object
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437 | * pProgress.createObject(); // ...
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438 | * pProgress->init(...); // ...
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439 | * ComPtr<IProgress> pProgress2; // create an interface pointer
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440 | * pProgress.queryInterfaceTo(pProgress2.asOutParam()); // transfer the interface
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441 | * }
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442 | *
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443 | * @endcode
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444 | */
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445 | template <class T>
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446 | class ComObjPtr : public ComPtr<T>
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447 | {
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448 | public:
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449 |
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450 | ComObjPtr()
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451 | : ComPtr<T>()
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452 | {}
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453 |
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454 | ComObjPtr(const ComObjPtr &that)
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455 | : ComPtr<T>(that)
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456 | {}
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457 |
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458 | ComObjPtr(T *that_p)
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459 | : ComPtr<T>(that_p)
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460 | {}
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461 |
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462 | ComObjPtr& operator=(const ComObjPtr &that)
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463 | {
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464 | ComPtr<T>::operator=(that);
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465 | return *this;
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466 | }
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467 |
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468 | ComObjPtr& operator=(T *that_p)
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469 | {
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470 | ComPtr<T>::operator=(that_p);
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471 | return *this;
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472 | }
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473 |
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474 | /**
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475 | * Creates a new server-side object of the given component class and
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476 | * immediately starts to manage a pointer to the created object (the
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477 | * previous pointer, if any, is of course released when appropriate).
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478 | *
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479 | * @note Win32: when VBOX_COM_OUTOFPROC_MODULE is defined, the created
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480 | * object doesn't increase the lock count of the server module, as it
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481 | * does otherwise.
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482 | *
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483 | * @note In order to make it easier to use, this method does _not_ throw
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484 | * bad_alloc, but instead returns E_OUTOFMEMORY.
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485 | */
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486 | HRESULT createObject()
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487 | {
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488 | HRESULT hrc;
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489 | #ifndef VBOX_WITH_XPCOM
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490 | # ifdef VBOX_COM_OUTOFPROC_MODULE
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491 | ATL::CComObjectNoLock<T> *obj = NULL;
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492 | try
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493 | {
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494 | obj = new ATL::CComObjectNoLock<T>();
|
---|
495 | }
|
---|
496 | catch (std::bad_alloc &)
|
---|
497 | {
|
---|
498 | obj = NULL;
|
---|
499 | }
|
---|
500 | if (obj)
|
---|
501 | {
|
---|
502 | obj->InternalFinalConstructAddRef();
|
---|
503 | try
|
---|
504 | {
|
---|
505 | hrc = obj->FinalConstruct();
|
---|
506 | }
|
---|
507 | catch (std::bad_alloc &)
|
---|
508 | {
|
---|
509 | hrc = E_OUTOFMEMORY;
|
---|
510 | }
|
---|
511 | obj->InternalFinalConstructRelease();
|
---|
512 | if (FAILED(hrc))
|
---|
513 | {
|
---|
514 | delete obj;
|
---|
515 | obj = NULL;
|
---|
516 | }
|
---|
517 | }
|
---|
518 | else
|
---|
519 | hrc = E_OUTOFMEMORY;
|
---|
520 | # else
|
---|
521 | ATL::CComObject<T> *obj = NULL;
|
---|
522 | hrc = ATL::CComObject<T>::CreateInstance(&obj);
|
---|
523 | # endif
|
---|
524 | #else /* VBOX_WITH_XPCOM */
|
---|
525 | ATL::CComObject<T> *obj;
|
---|
526 | # ifndef RT_EXCEPTIONS_ENABLED
|
---|
527 | obj = new ATL::CComObject<T>();
|
---|
528 | # else
|
---|
529 | try
|
---|
530 | {
|
---|
531 | obj = new ATL::CComObject<T>();
|
---|
532 | }
|
---|
533 | catch (std::bad_alloc &)
|
---|
534 | {
|
---|
535 | obj = NULL;
|
---|
536 | }
|
---|
537 | # endif
|
---|
538 | if (obj)
|
---|
539 | {
|
---|
540 | # ifndef RT_EXCEPTIONS_ENABLED
|
---|
541 | hrc = obj->FinalConstruct();
|
---|
542 | # else
|
---|
543 | try
|
---|
544 | {
|
---|
545 | hrc = obj->FinalConstruct();
|
---|
546 | }
|
---|
547 | catch (std::bad_alloc &)
|
---|
548 | {
|
---|
549 | hrc = E_OUTOFMEMORY;
|
---|
550 | }
|
---|
551 | # endif
|
---|
552 | if (FAILED(hrc))
|
---|
553 | {
|
---|
554 | delete obj;
|
---|
555 | obj = NULL;
|
---|
556 | }
|
---|
557 | }
|
---|
558 | else
|
---|
559 | hrc = E_OUTOFMEMORY;
|
---|
560 | #endif /* VBOX_WITH_XPCOM */
|
---|
561 | *this = obj;
|
---|
562 | return hrc;
|
---|
563 | }
|
---|
564 | };
|
---|
565 |
|
---|
566 | /** @} */
|
---|
567 |
|
---|
568 | #endif /* !VBOX_INCLUDED_com_ptr_h */
|
---|
569 |
|
---|