VirtualBoxBase.h@ 98102

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1	/* $Id: VirtualBoxBase.h 96407 2022-08-22 17:43:14Z vboxsync $ */
2	/** @file
3	* VirtualBox COM base classes definition
4	*/
5
6	/*
7	* Copyright (C) 2006-2022 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28	#ifndef MAIN_INCLUDED_VirtualBoxBase_h
29	#define MAIN_INCLUDED_VirtualBoxBase_h
30	#ifndef RT_WITHOUT_PRAGMA_ONCE
31	# pragma once
32	#endif
33
34	#include <iprt/cdefs.h>
35	#include <iprt/thread.h>
36
37	#include <list>
38	#include <map>
39
40	#include "ObjectState.h"
41
42	#include "VBox/com/AutoLock.h"
43	#include "VBox/com/string.h"
44	#include "VBox/com/Guid.h"
45
46	#include "VBox/com/VirtualBox.h"
47
48	#include "VirtualBoxTranslator.h"
49
50	// avoid including VBox/settings.h and VBox/xml.h; only declare the classes
51	namespace xml
52	{
53	class File;
54	}
55
56	namespace com
57	{
58	class ErrorInfo;
59	}
60
61	using namespace com;
62	using namespace util;
63
64	class VirtualBox;
65	class Machine;
66	class Medium;
67	class Host;
68	typedef std::list<ComObjPtr<Medium> > MediaList;
69	typedef std::list<Utf8Str> StringsList;
70
71	////////////////////////////////////////////////////////////////////////////////
72	//
73	// COM helpers
74	//
75	////////////////////////////////////////////////////////////////////////////////
76
77	#if !defined(VBOX_WITH_XPCOM)
78
79	/* use a special version of the singleton class factory,
80	* see KB811591 in msdn for more info. */
81
82	#undef DECLARE_CLASSFACTORY_SINGLETON
83	#define DECLARE_CLASSFACTORY_SINGLETON(obj) DECLARE_CLASSFACTORY_EX(CMyComClassFactorySingleton<obj>)
84
85	/**
86	* @todo r=bird: This CMyComClassFactorySingleton stuff is probably obsoleted by
87	* microatl.h? Right?
88	*/
89
90	template <class T>
91	class CMyComClassFactorySingleton : public ATL::CComClassFactory
92	{
93	public:
94	CMyComClassFactorySingleton() :
95	m_hrCreate(S_OK), m_spObj(NULL)
96	{
97	}
98	virtual ~CMyComClassFactorySingleton()
99	{
100	if (m_spObj)
101	m_spObj->Release();
102	}
103	// IClassFactory
104	STDMETHOD(CreateInstance)(LPUNKNOWN pUnkOuter, REFIID riid, void** ppvObj)
105	{
106	HRESULT hRes = E_POINTER;
107	if (ppvObj != NULL)
108	{
109	*ppvObj = NULL;
110	// no aggregation for singletons
111	AssertReturn(pUnkOuter == NULL, CLASS_E_NOAGGREGATION);
112	if (m_hrCreate == S_OK && m_spObj == NULL)
113	{
114	Lock();
115	__try
116	{
117	// Fix: The following If statement was moved inside the __try statement.
118	// Did another thread arrive here first?
119	if (m_hrCreate == S_OK && m_spObj == NULL)
120	{
121	// lock the module to indicate activity
122	// (necessary for the monitor shutdown thread to correctly
123	// terminate the module in case when CreateInstance() fails)
124	ATL::_pAtlModule->Lock();
125	ATL::CComObjectCached<T> *p;
126	m_hrCreate = ATL::CComObjectCached<T>::CreateInstance(&p);
127	if (SUCCEEDED(m_hrCreate))
128	{
129	m_hrCreate = p->QueryInterface(IID_IUnknown, (void **)&m_spObj);
130	if (FAILED(m_hrCreate))
131	{
132	delete p;
133	}
134	}
135	ATL::_pAtlModule->Unlock();
136	}
137	}
138	__finally
139	{
140	Unlock();
141	}
142	}
143	if (m_hrCreate == S_OK)
144	{
145	hRes = m_spObj->QueryInterface(riid, ppvObj);
146	}
147	else
148	{
149	hRes = m_hrCreate;
150	}
151	}
152	return hRes;
153	}
154	HRESULT m_hrCreate;
155	IUnknown *m_spObj;
156	};
157
158	#endif /* !defined(VBOX_WITH_XPCOM) */
159
160	////////////////////////////////////////////////////////////////////////////////
161	//
162	// Macros
163	//
164	////////////////////////////////////////////////////////////////////////////////
165
166	/**
167	* Special version of the Assert macro to be used within VirtualBoxBase
168	* subclasses.
169	*
170	* In the debug build, this macro is equivalent to Assert.
171	* In the release build, this macro uses \|setError(E_FAIL, ...)\| to set the
172	* error info from the asserted expression.
173	*
174	* @see VirtualBoxBase::setError
175	*
176	* @param expr Expression which should be true.
177	*/
178	#define ComAssert(expr) \
179	do { \
180	if (RT_LIKELY(!!(expr))) \
181	{ /* likely */ } \
182	else \
183	{ \
184	AssertMsgFailed(("%s\n", #expr)); \
185	setError(E_FAIL, \
186	VirtualBoxBase::tr("Assertion failed: [%s] at '%s' (%d) in %s.\nPlease contact the product vendor!"), \
187	#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
188	} \
189	} while (0)
190
191	/**
192	* Special version of the AssertFailed macro to be used within VirtualBoxBase
193	* subclasses.
194	*
195	* In the debug build, this macro is equivalent to AssertFailed.
196	* In the release build, this macro uses \|setError(E_FAIL, ...)\| to set the
197	* error info from the asserted expression.
198	*
199	* @see VirtualBoxBase::setError
200	*
201	*/
202	#define ComAssertFailed() \
203	do { \
204	AssertFailed(); \
205	setError(E_FAIL, \
206	VirtualBoxBase::tr("Assertion failed: at '%s' (%d) in %s.\nPlease contact the product vendor!"), \
207	__FILE__, __LINE__, __PRETTY_FUNCTION__); \
208	} while (0)
209
210	/**
211	* Special version of the AssertMsg macro to be used within VirtualBoxBase
212	* subclasses.
213	*
214	* See ComAssert for more info.
215	*
216	* @param expr Expression which should be true.
217	* @param a printf argument list (in parenthesis).
218	*/
219	#define ComAssertMsg(expr, a) \
220	do { \
221	if (RT_LIKELY(!!(expr))) \
222	{ /* likely */ } \
223	else \
224	{ \
225	Utf8StrFmt MyAssertMsg a; /* may throw bad_alloc */ \
226	AssertMsgFailed(("%s\n", MyAssertMsg.c_str())); \
227	setError(E_FAIL, \
228	VirtualBoxBase::tr("Assertion failed: [%s] at '%s' (%d) in %s.\n%s.\nPlease contact the product vendor!"), \
229	#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__, MyAssertMsg.c_str()); \
230	} \
231	} while (0)
232
233	/**
234	* Special version of the AssertMsgFailed macro to be used within VirtualBoxBase
235	* subclasses.
236	*
237	* See ComAssert for more info.
238	*
239	* @param a printf argument list (in parenthesis).
240	*/
241	#define ComAssertMsgFailed(a) \
242	do { \
243	Utf8StrFmt MyAssertMsg a; /* may throw bad_alloc */ \
244	AssertMsgFailed(("%s\n", MyAssertMsg.c_str())); \
245	setError(E_FAIL, \
246	VirtualBoxBase::tr("Assertion failed: at '%s' (%d) in %s.\n%s.\nPlease contact the product vendor!"), \
247	__FILE__, __LINE__, __PRETTY_FUNCTION__, MyAssertMsg.c_str()); \
248	} while (0)
249
250	/**
251	* Special version of the AssertRC macro to be used within VirtualBoxBase
252	* subclasses.
253	*
254	* See ComAssert for more info.
255	*
256	* @param vrc VBox status code.
257	*/
258	#define ComAssertRC(vrc) ComAssertMsgRC(vrc, ("%Rra", vrc))
259
260	/**
261	* Special version of the AssertMsgRC macro to be used within VirtualBoxBase
262	* subclasses.
263	*
264	* See ComAssert for more info.
265	*
266	* @param vrc VBox status code.
267	* @param msg printf argument list (in parenthesis).
268	*/
269	#define ComAssertMsgRC(vrc, msg) ComAssertMsg(RT_SUCCESS(vrc), msg)
270
271	/**
272	* Special version of the AssertComRC macro to be used within VirtualBoxBase
273	* subclasses.
274	*
275	* See ComAssert for more info.
276	*
277	* @param hrc COM result code
278	*/
279	#define ComAssertComRC(hrc) ComAssertMsg(SUCCEEDED(hrc), ("COM RC=%Rhrc (0x%08X)", (hrc), (hrc)))
280
281
282	/** Special version of ComAssert that returns ret if expr fails */
283	#define ComAssertRet(expr, ret) \
284	do { ComAssert(expr); if (!(expr)) return (ret); } while (0)
285	/** Special version of ComAssertMsg that returns ret if expr fails */
286	#define ComAssertMsgRet(expr, a, ret) \
287	do { ComAssertMsg(expr, a); if (!(expr)) return (ret); } while (0)
288	/** Special version of ComAssertRC that returns ret if vrc does not succeed */
289	#define ComAssertRCRet(vrc, ret) \
290	do { ComAssertRC(vrc); if (!RT_SUCCESS(vrc)) return (ret); } while (0)
291	/** Special version of ComAssertComRC that returns ret if rc does not succeed */
292	#define ComAssertComRCRet(rc, ret) \
293	do { ComAssertComRC(rc); if (!SUCCEEDED(rc)) return (ret); } while (0)
294	/** Special version of ComAssertComRC that returns rc if rc does not succeed */
295	#define ComAssertComRCRetRC(rc) \
296	do { ComAssertComRC(rc); if (!SUCCEEDED(rc)) return (rc); } while (0)
297	/** Special version of ComAssertFailed that returns ret */
298	#define ComAssertFailedRet(ret) \
299	do { ComAssertFailed(); return (ret); } while (0)
300	/** Special version of ComAssertMsgFailed that returns ret */
301	#define ComAssertMsgFailedRet(msg, ret) \
302	do { ComAssertMsgFailed(msg); return (ret); } while (0)
303
304
305	/** Special version of ComAssert that returns void if expr fails */
306	#define ComAssertRetVoid(expr) \
307	do { ComAssert(expr); if (!(expr)) return; } while (0)
308	/** Special version of ComAssertMsg that returns void if expr fails */
309	#define ComAssertMsgRetVoid(expr, a) \
310	do { ComAssertMsg(expr, a); if (!(expr)) return; } while (0)
311	/** Special version of ComAssertRC that returns void if vrc does not succeed */
312	#define ComAssertRCRetVoid(vrc) \
313	do { ComAssertRC(vrc); if (!RT_SUCCESS(vrc)) return; } while (0)
314	/** Special version of ComAssertComRC that returns void if rc does not succeed */
315	#define ComAssertComRCRetVoid(rc) \
316	do { ComAssertComRC(rc); if (!SUCCEEDED(rc)) return; } while (0)
317	/** Special version of ComAssertFailed that returns void */
318	#define ComAssertFailedRetVoid() \
319	do { ComAssertFailed(); return; } while (0)
320	/** Special version of ComAssertMsgFailed that returns void */
321	#define ComAssertMsgFailedRetVoid(msg) \
322	do { ComAssertMsgFailed(msg); return; } while (0)
323
324
325	/** Special version of ComAssert that evaluates eval and breaks if expr fails */
326	#define ComAssertBreak(expr, eval) \
327	if (1) { ComAssert(expr); if (!(expr)) { eval; break; } } else do {} while (0)
328	/** Special version of ComAssertMsg that evaluates eval and breaks if expr fails */
329	#define ComAssertMsgBreak(expr, a, eval) \
330	if (1) { ComAssertMsg(expr, a); if (!(expr)) { eval; break; } } else do {} while (0)
331	/** Special version of ComAssertRC that evaluates eval and breaks if vrc does not succeed */
332	#define ComAssertRCBreak(vrc, eval) \
333	if (1) { ComAssertRC(vrc); if (!RT_SUCCESS(vrc)) { eval; break; } } else do {} while (0)
334	/** Special version of ComAssertFailed that evaluates eval and breaks */
335	#define ComAssertFailedBreak(eval) \
336	if (1) { ComAssertFailed(); { eval; break; } } else do {} while (0)
337	/** Special version of ComAssertMsgFailed that evaluates eval and breaks */
338	#define ComAssertMsgFailedBreak(msg, eval) \
339	if (1) { ComAssertMsgFailed (msg); { eval; break; } } else do {} while (0)
340	/** Special version of ComAssertComRC that evaluates eval and breaks if rc does not succeed */
341	#define ComAssertComRCBreak(rc, eval) \
342	if (1) { ComAssertComRC(rc); if (!SUCCEEDED(rc)) { eval; break; } } else do {} while (0)
343	/** Special version of ComAssertComRC that just breaks if rc does not succeed */
344	#define ComAssertComRCBreakRC(rc) \
345	if (1) { ComAssertComRC(rc); if (!SUCCEEDED(rc)) { break; } } else do {} while (0)
346
347
348	/** Special version of ComAssert that evaluates eval and throws it if expr fails */
349	#define ComAssertThrow(expr, eval) \
350	do { ComAssert(expr); if (!(expr)) { throw (eval); } } while (0)
351	/** Special version of ComAssertRC that evaluates eval and throws it if vrc does not succeed */
352	#define ComAssertRCThrow(vrc, eval) \
353	do { ComAssertRC(vrc); if (!RT_SUCCESS(vrc)) { throw (eval); } } while (0)
354	/** Special version of ComAssertComRC that evaluates eval and throws it if rc does not succeed */
355	#define ComAssertComRCThrow(rc, eval) \
356	do { ComAssertComRC(rc); if (!SUCCEEDED(rc)) { throw (eval); } } while (0)
357	/** Special version of ComAssertComRC that just throws rc if rc does not succeed */
358	#define ComAssertComRCThrowRC(rc) \
359	do { ComAssertComRC(rc); if (!SUCCEEDED(rc)) { throw rc; } } while (0)
360	/** Special version of ComAssert that throws eval */
361	#define ComAssertFailedThrow(eval) \
362	do { ComAssertFailed(); { throw (eval); } } while (0)
363
364	////////////////////////////////////////////////////////////////////////////////
365
366	/**
367	* Checks that the pointer argument is not NULL and returns E_INVALIDARG +
368	* extended error info on failure.
369	* @param arg Input pointer-type argument (strings, interface pointers...)
370	*/
371	#define CheckComArgNotNull(arg) \
372	do { \
373	if (RT_LIKELY((arg) != NULL)) \
374	{ /* likely */ }\
375	else \
376	return setError(E_INVALIDARG, VirtualBoxBase::tr("Argument %s is NULL"), #arg); \
377	} while (0)
378
379	/**
380	* Checks that the pointer argument is a valid pointer or NULL and returns
381	* E_INVALIDARG + extended error info on failure.
382	* @param arg Input pointer-type argument (strings, interface pointers...)
383	*/
384	#define CheckComArgMaybeNull(arg) \
385	do { \
386	if (RT_LIKELY(RT_VALID_PTR(arg) \|\| (arg) == NULL)) \
387	{ /* likely */ }\
388	else \
389	return setError(E_INVALIDARG, \
390	VirtualBoxBase::tr("Argument %s is an invalid pointer"), #arg); \
391	} while (0)
392
393	/**
394	* Checks that the given pointer to an argument is valid and returns
395	* E_POINTER + extended error info otherwise.
396	* @param arg Pointer argument.
397	*/
398	#define CheckComArgPointerValid(arg) \
399	do { \
400	if (RT_LIKELY(RT_VALID_PTR(arg))) \
401	{ /* likely */ }\
402	else \
403	return setError(E_POINTER, \
404	VirtualBoxBase::tr("Argument %s points to invalid memory location (%p)"), \
405	#arg, (void *)(arg)); \
406	} while (0)
407
408	/**
409	* Checks that safe array argument is not NULL and returns E_INVALIDARG +
410	* extended error info on failure.
411	* @param arg Input safe array argument (strings, interface pointers...)
412	*/
413	#define CheckComArgSafeArrayNotNull(arg) \
414	do { \
415	if (RT_LIKELY(!ComSafeArrayInIsNull(arg))) \
416	{ /* likely */ }\
417	else \
418	return setError(E_INVALIDARG, \
419	VirtualBoxBase::tr("Argument %s is NULL"), #arg); \
420	} while (0)
421
422	/**
423	* Checks that a string input argument is valid (not NULL or obviously invalid
424	* pointer), returning E_INVALIDARG + extended error info if invalid.
425	* @param a_bstrIn Input string argument (IN_BSTR).
426	*/
427	#define CheckComArgStr(a_bstrIn) \
428	do { \
429	IN_BSTR const bstrInCheck = (a_bstrIn); /* type check */ \
430	if (RT_LIKELY(RT_VALID_PTR(bstrInCheck))) \
431	{ /* likely */ }\
432	else \
433	return setError(E_INVALIDARG, \
434	VirtualBoxBase::tr("Argument %s is an invalid pointer"), #a_bstrIn); \
435	} while (0)
436	/**
437	* Checks that the string argument is not a NULL, a invalid pointer or an empty
438	* string, returning E_INVALIDARG + extended error info on failure.
439	* @param a_bstrIn Input string argument (BSTR etc.).
440	*/
441	#define CheckComArgStrNotEmptyOrNull(a_bstrIn) \
442	do { \
443	IN_BSTR const bstrInCheck = (a_bstrIn); /* type check */ \
444	if (RT_LIKELY(RT_VALID_PTR(bstrInCheck) && *(bstrInCheck) != '\0')) \
445	{ /* likely */ }\
446	else \
447	return setError(E_INVALIDARG, \
448	VirtualBoxBase::tr("Argument %s is empty or an invalid pointer"), \
449	#a_bstrIn); \
450	} while (0)
451
452	/**
453	* Converts the Guid input argument (string) to a Guid object, returns with
454	* E_INVALIDARG and error message on failure.
455	*
456	* @param a_Arg Argument.
457	* @param a_GuidVar The Guid variable name.
458	*/
459	#define CheckComArgGuid(a_Arg, a_GuidVar) \
460	do { \
461	Guid tmpGuid(a_Arg); \
462	(a_GuidVar) = tmpGuid; \
463	if (RT_LIKELY((a_GuidVar).isValid())) \
464	{ /* likely */ }\
465	else \
466	return setError(E_INVALIDARG, \
467	VirtualBoxBase::tr("GUID argument %s is not valid (\"%ls\")"), \
468	#a_Arg, Bstr(a_Arg).raw()); \
469	} while (0)
470
471	/**
472	* Checks that the given expression (that must involve the argument) is true and
473	* returns E_INVALIDARG + extended error info on failure.
474	* @param arg Argument.
475	* @param expr Expression to evaluate.
476	*/
477	#define CheckComArgExpr(arg, expr) \
478	do { \
479	if (RT_LIKELY(!!(expr))) \
480	{ /* likely */ }\
481	else \
482	return setError(E_INVALIDARG, \
483	VirtualBoxBase::tr("Argument %s is invalid (must be %s)"), \
484	#arg, #expr); \
485	} while (0)
486
487	/**
488	* Checks that the given expression (that must involve the argument) is true and
489	* returns E_INVALIDARG + extended error info on failure. The error message must
490	* be customized.
491	* @param arg Argument.
492	* @param expr Expression to evaluate.
493	* @param msg Parenthesized printf-like expression (must start with a verb,
494	* like "must be one of...", "is not within...").
495	*/
496	#define CheckComArgExprMsg(arg, expr, msg) \
497	do { \
498	if (RT_LIKELY(!!(expr))) \
499	{ /* likely */ }\
500	else \
501	return setError(E_INVALIDARG, VirtualBoxBase::tr("Argument %s %s"), \
502	#arg, Utf8StrFmt msg .c_str()); \
503	} while (0)
504
505	/**
506	* Checks that the given pointer to an output argument is valid and returns
507	* E_POINTER + extended error info otherwise.
508	* @param arg Pointer argument.
509	*/
510	#define CheckComArgOutPointerValid(arg) \
511	do { \
512	if (RT_LIKELY(RT_VALID_PTR(arg))) \
513	{ /* likely */ }\
514	else \
515	return setError(E_POINTER, \
516	VirtualBoxBase::tr("Output argument %s points to invalid memory location (%p)"), \
517	#arg, (void *)(arg)); \
518	} while (0)
519
520	/**
521	* Checks that the given pointer to an output safe array argument is valid and
522	* returns E_POINTER + extended error info otherwise.
523	* @param arg Safe array argument.
524	*/
525	#define CheckComArgOutSafeArrayPointerValid(arg) \
526	do { \
527	if (RT_LIKELY(!ComSafeArrayOutIsNull(arg))) \
528	{ /* likely */ }\
529	else \
530	return setError(E_POINTER, \
531	VirtualBoxBase::tr("Output argument %s points to invalid memory location (%p)"), \
532	#arg, (void*)(arg)); \
533	} while (0)
534
535	/**
536	* Sets the extended error info and returns E_NOTIMPL.
537	*/
538	#define ReturnComNotImplemented() \
539	do { \
540	return setError(E_NOTIMPL, VirtualBoxBase::tr("Method %s is not implemented"), __FUNCTION__); \
541	} while (0)
542
543	/**
544	* Declares an empty constructor and destructor for the given class.
545	* This is useful to prevent the compiler from generating the default
546	* ctor and dtor, which in turn allows to use forward class statements
547	* (instead of including their header files) when declaring data members of
548	* non-fundamental types with constructors (which are always called implicitly
549	* by constructors and by the destructor of the class).
550	*
551	* This macro is to be placed within (the public section of) the class
552	* declaration. Its counterpart, DEFINE_EMPTY_CTOR_DTOR, must be placed
553	* somewhere in one of the translation units (usually .cpp source files).
554	*
555	* @param cls class to declare a ctor and dtor for
556	*/
557	#define DECLARE_EMPTY_CTOR_DTOR(cls) cls(); virtual ~cls();
558
559	/**
560	* Defines an empty constructor and destructor for the given class.
561	* See DECLARE_EMPTY_CTOR_DTOR for more info.
562	*/
563	#define DEFINE_EMPTY_CTOR_DTOR(cls) \
564	cls::cls() { /empty/ } \
565	cls::~cls() { /empty/ }
566
567	/**
568	* A variant of 'throw' that hits a debug breakpoint first to make
569	* finding the actual thrower possible.
570	*/
571	#ifdef DEBUG
572	# define DebugBreakThrow(a) \
573	do { \
574	RTAssertDebugBreak(); \
575	throw (a); \
576	} while (0)
577	#else
578	# define DebugBreakThrow(a) throw (a)
579	#endif
580
581	////////////////////////////////////////////////////////////////////////////////
582	//
583	// VirtualBoxBase
584	//
585	////////////////////////////////////////////////////////////////////////////////
586
587	#ifdef VBOX_WITH_MAIN_NLS
588	# define DECLARE_TRANSLATE_METHODS(cls) \
589	static inline const char tr(const char aSourceText, \
590	const char *aComment = NULL, \
591	const size_t aNum = ~(size_t)0) \
592	{ \
593	return VirtualBoxTranslator::translate(NULL, #cls, aSourceText, aComment, aNum); \
594	}
595	#else
596	# define DECLARE_TRANSLATE_METHODS(cls) \
597	static inline const char tr(const char aSourceText, \
598	const char *aComment = NULL, \
599	const size_t aNum = ~(size_t)0) \
600	{ \
601	RT_NOREF(aComment, aNum); \
602	return aSourceText; \
603	}
604	#endif
605
606	#define DECLARE_COMMON_CLASS_METHODS(cls) \
607	DECLARE_EMPTY_CTOR_DTOR(cls) \
608	DECLARE_TRANSLATE_METHODS(cls)
609
610	#define VIRTUALBOXBASE_ADD_VIRTUAL_COMPONENT_METHODS(cls, iface) \
611	virtual const IID& getClassIID() const \
612	{ \
613	return cls::getStaticClassIID(); \
614	} \
615	static const IID& getStaticClassIID() \
616	{ \
617	return COM_IIDOF(iface); \
618	} \
619	virtual const char* getComponentName() const \
620	{ \
621	return cls::getStaticComponentName(); \
622	} \
623	static const char* getStaticComponentName() \
624	{ \
625	return #cls; \
626	}
627
628	/**
629	* VIRTUALBOXBASE_ADD_ERRORINFO_SUPPORT:
630	* This macro must be used once in the declaration of any class derived
631	* from VirtualBoxBase. It implements the pure virtual getClassIID() and
632	* getComponentName() methods. If this macro is not present, instances
633	* of a class derived from VirtualBoxBase cannot be instantiated.
634	*
635	* @param cls The class name, e.g. "Class".
636	* @param iface The interface name which this class implements, e.g. "IClass".
637	*/
638	#ifdef VBOX_WITH_XPCOM
639	#define VIRTUALBOXBASE_ADD_ERRORINFO_SUPPORT(cls, iface) \
640	VIRTUALBOXBASE_ADD_VIRTUAL_COMPONENT_METHODS(cls, iface)
641	#else // !VBOX_WITH_XPCOM
642	#define VIRTUALBOXBASE_ADD_ERRORINFO_SUPPORT(cls, iface) \
643	VIRTUALBOXBASE_ADD_VIRTUAL_COMPONENT_METHODS(cls, iface) \
644	STDMETHOD(InterfaceSupportsErrorInfo)(REFIID riid) \
645	{ \
646	const ATL::_ATL_INTMAP_ENTRY* pEntries = cls::_GetEntries(); \
647	Assert(pEntries); \
648	if (!pEntries) \
649	return S_FALSE; \
650	BOOL bSupports = FALSE; \
651	BOOL bISupportErrorInfoFound = FALSE; \
652	while (pEntries->pFunc != NULL && !bSupports) \
653	{ \
654	if (!bISupportErrorInfoFound) \
655	bISupportErrorInfoFound = InlineIsEqualGUID(*(pEntries->piid), IID_ISupportErrorInfo); \
656	else \
657	bSupports = InlineIsEqualGUID(*(pEntries->piid), riid); \
658	pEntries++; \
659	} \
660	Assert(bISupportErrorInfoFound); \
661	return bSupports ? S_OK : S_FALSE; \
662	}
663	#endif // !VBOX_WITH_XPCOM
664
665	/**
666	* VBOX_TWEAK_INTERFACE_ENTRY:
667	* Macro for defining magic interface entries needed for all interfaces
668	* implemented by any subclass of VirtualBoxBase.
669	*/
670	#ifdef VBOX_WITH_XPCOM
671	#define VBOX_TWEAK_INTERFACE_ENTRY(iface)
672	#else // !VBOX_WITH_XPCOM
673	#define VBOX_TWEAK_INTERFACE_ENTRY(iface) \
674	COM_INTERFACE_ENTRY_AGGREGATE(IID_IMarshal, m_pUnkMarshaler.m_p)
675	#endif // !VBOX_WITH_XPCOM
676
677
678	/**
679	* Abstract base class for all component classes implementing COM
680	* interfaces of the VirtualBox COM library.
681	*
682	* Declares functionality that should be available in all components.
683	*
684	* The object state logic is documented in ObjectState.h.
685	*/
686	class ATL_NO_VTABLE VirtualBoxBase
687	: public Lockable
688	, public ATL::CComObjectRootEx<ATL::CComMultiThreadModel>
689	#if !defined (VBOX_WITH_XPCOM)
690	, public ISupportErrorInfo
691	#endif
692	{
693	protected:
694	#ifdef RT_OS_WINDOWS
695	ComPtr<IUnknown> m_pUnkMarshaler;
696	#endif
697
698	HRESULT BaseFinalConstruct();
699	void BaseFinalRelease();
700
701	public:
702	DECLARE_COMMON_CLASS_METHODS(VirtualBoxBase)
703
704	/**
705	* Uninitialization method.
706	*
707	* Must be called by all final implementations (component classes) when the
708	* last reference to the object is released, before calling the destructor.
709	*
710	* @note Never call this method the AutoCaller scope or after the
711	* ObjectState::addCaller() call not paired by
712	* ObjectState::releaseCaller() because it is a guaranteed deadlock.
713	* See AutoUninitSpan and AutoCaller.h/ObjectState.h for details.
714	*/
715	virtual void uninit()
716	{ }
717
718	/**
719	*/
720	ObjectState &getObjectState()
721	{
722	return mState;
723	}
724
725	/**
726	* Pure virtual method for simple run-time type identification without
727	* having to enable C++ RTTI.
728	*
729	* This must be implemented by every subclass deriving from VirtualBoxBase;
730	* use the VIRTUALBOXBASE_ADD_ERRORINFO_SUPPORT macro to do that most easily.
731	*/
732	virtual const IID& getClassIID() const = 0;
733
734	/**
735	* Pure virtual method for simple run-time type identification without
736	* having to enable C++ RTTI.
737	*
738	* This must be implemented by every subclass deriving from VirtualBoxBase;
739	* use the VIRTUALBOXBASE_ADD_ERRORINFO_SUPPORT macro to do that most easily.
740	*/
741	virtual const char* getComponentName() const = 0;
742
743	/**
744	* Virtual method which determines the locking class to be used for validating
745	* lock order with the standard member lock handle. This method is overridden
746	* in a number of subclasses.
747	*/
748	virtual VBoxLockingClass getLockingClass() const
749	{
750	return LOCKCLASS_OTHEROBJECT;
751	}
752
753	virtual RWLockHandle *lockHandle() const;
754
755	static HRESULT handleUnexpectedExceptions(VirtualBoxBase *const aThis, RT_SRC_POS_DECL);
756
757	static HRESULT setErrorInternalF(HRESULT aResultCode,
758	const GUID &aIID,
759	const char *aComponent,
760	bool aWarning,
761	bool aLogIt,
762	LONG aResultDetail,
763	const char *aText, ...);
764	static HRESULT setErrorInternalV(HRESULT aResultCode,
765	const GUID &aIID,
766	const char *aComponent,
767	const char *aText,
768	va_list aArgs,
769	bool aWarning,
770	bool aLogIt,
771	LONG aResultDetail = 0);
772	static void clearError(void);
773
774	HRESULT setError(HRESULT aResultCode);
775	HRESULT setError(HRESULT aResultCode, const char *pcsz, ...);
776	HRESULT setError(const ErrorInfo &ei);
777	HRESULT setErrorVrcV(int vrc, const char *pcszMsgFmt, va_list va_args);
778	HRESULT setErrorVrc(int vrc);
779	HRESULT setErrorVrc(int vrc, const char *pcszMsgFmt, ...);
780	HRESULT setErrorBoth(HRESULT hrc, int vrc);
781	HRESULT setErrorBoth(HRESULT hrc, int vrc, const char *pcszMsgFmt, ...);
782	HRESULT setWarning(HRESULT aResultCode, const char *pcsz, ...);
783	HRESULT setErrorNoLog(HRESULT aResultCode, const char *pcsz, ...);
784
785
786	/** Initialize COM for a new thread. */
787	static HRESULT initializeComForThread(void)
788	{
789	#ifndef VBOX_WITH_XPCOM
790	HRESULT hrc = CoInitializeEx(NULL, COINIT_MULTITHREADED \| COINIT_DISABLE_OLE1DDE \| COINIT_SPEED_OVER_MEMORY);
791	AssertComRCReturn(hrc, hrc);
792	#endif
793	return S_OK;
794	}
795
796	/** Uninitializes COM for a dying thread. */
797	static void uninitializeComForThread(void)
798	{
799	#ifndef VBOX_WITH_XPCOM
800	CoUninitialize();
801	#endif
802	}
803
804
805	private:
806	/** Object for representing object state */
807	ObjectState mState;
808
809	/** User-level object lock for subclasses */
810	RWLockHandle *mObjectLock;
811
812	/** Slot of this object in the g_aClassFactoryStats array */
813	uint32_t iFactoryStat;
814
815	private:
816	DECLARE_CLS_COPY_CTOR_ASSIGN_NOOP(VirtualBoxBase); /* Shuts up MSC warning C4625. */
817	};
818
819	/** Structure for counting the currently existing and ever created objects
820	* for each component name. */
821	typedef struct CLASSFACTORY_STAT
822	{
823	const char *psz;
824	uint64_t current;
825	uint64_t overall;
826	} CLASSFACTORY_STAT;
827
828	/** Maximum number of component names to deal with. There will be debug
829	* assertions if the value is too low. Since the table is global and its
830	* entries are reasonably small, it's not worth squeezing out the last bit. */
831	#define CLASSFACTORYSTATS_MAX 128
832
833	/* global variables (defined in VirtualBoxBase.cpp) */
834	extern CLASSFACTORY_STAT g_aClassFactoryStats[CLASSFACTORYSTATS_MAX];
835	extern RWLockHandle *g_pClassFactoryStatsLock;
836
837	extern void APIDumpComponentFactoryStats();
838
839	/**
840	* Dummy macro that is used to shut down Qt's lupdate tool warnings in some
841	* situations. This macro needs to be present inside (better at the very
842	* beginning) of the declaration of the class that uses translation, to make
843	* lupdate happy.
844	*/
845	#define Q_OBJECT
846
847	////////////////////////////////////////////////////////////////////////////////
848
849	////////////////////////////////////////////////////////////////////////////////
850
851
852	/**
853	* Simple template that manages data structure allocation/deallocation
854	* and supports data pointer sharing (the instance that shares the pointer is
855	* not responsible for memory deallocation as opposed to the instance that
856	* owns it).
857	*/
858	template <class D>
859	class Shareable
860	{
861	public:
862
863	Shareable() : mData(NULL), mIsShared(FALSE) {}
864	virtual ~Shareable() { free(); }
865
866	void allocate() { attach(new D); }
867
868	virtual void free() {
869	if (mData) {
870	if (!mIsShared)
871	delete mData;
872	mData = NULL;
873	mIsShared = false;
874	}
875	}
876
877	void attach(D *d) {
878	AssertMsg(d, ("new data must not be NULL"));
879	if (d && mData != d) {
880	if (mData && !mIsShared)
881	delete mData;
882	mData = d;
883	mIsShared = false;
884	}
885	}
886
887	void attach(Shareable &d) {
888	AssertMsg(
889	d.mData == mData \|\| !d.mIsShared,
890	("new data must not be shared")
891	);
892	if (this != &d && !d.mIsShared) {
893	attach(d.mData);
894	d.mIsShared = true;
895	}
896	}
897
898	void share(D *d) {
899	AssertMsg(d, ("new data must not be NULL"));
900	if (mData != d) {
901	if (mData && !mIsShared)
902	delete mData;
903	mData = d;
904	mIsShared = true;
905	}
906	}
907
908	void share(const Shareable &d) { share(d.mData); }
909
910	void attachCopy(const D *d) {
911	AssertMsg(d, ("data to copy must not be NULL"));
912	if (d)
913	attach(new D(*d));
914	}
915
916	void attachCopy(const Shareable &d) {
917	attachCopy(d.mData);
918	}
919
920	virtual D *detach() {
921	D *d = mData;
922	mData = NULL;
923	mIsShared = false;
924	return d;
925	}
926
927	D *data() const {
928	return mData;
929	}
930
931	D *operator->() const {
932	AssertMsg(mData, ("data must not be NULL"));
933	return mData;
934	}
935
936	bool isNull() const { return mData == NULL; }
937	bool operator!() const { return isNull(); }
938
939	bool isShared() const { return mIsShared; }
940
941	protected:
942
943	D *mData;
944	bool mIsShared;
945	};
946
947	/**
948	* Simple template that enhances Shareable<> and supports data
949	* backup/rollback/commit (using the copy constructor of the managed data
950	* structure).
951	*/
952	template<class D>
953	class Backupable : public Shareable<D>
954	{
955	public:
956
957	Backupable() : Shareable<D>(), mBackupData(NULL) {}
958
959	void free()
960	{
961	AssertMsg(this->mData \|\| !mBackupData, ("backup must be NULL if data is NULL"));
962	rollback();
963	Shareable<D>::free();
964	}
965
966	D *detach()
967	{
968	AssertMsg(this->mData \|\| !mBackupData, ("backup must be NULL if data is NULL"));
969	rollback();
970	return Shareable<D>::detach();
971	}
972
973	void share(const Backupable &d)
974	{
975	AssertMsg(!d.isBackedUp(), ("data to share must not be backed up"));
976	if (!d.isBackedUp())
977	Shareable<D>::share(d.mData);
978	}
979
980	/**
981	* Stores the current data pointer in the backup area, allocates new data
982	* using the copy constructor on current data and makes new data active.
983	*
984	* @deprecated Use backupEx to avoid throwing wild out-of-memory exceptions.
985	*/
986	void backup()
987	{
988	AssertMsg(this->mData, ("data must not be NULL"));
989	if (this->mData && !mBackupData)
990	{
991	D pNewData = new D(this->mData);
992	mBackupData = this->mData;
993	this->mData = pNewData;
994	}
995	}
996
997	/**
998	* Stores the current data pointer in the backup area, allocates new data
999	* using the copy constructor on current data and makes new data active.
1000	*
1001	* @returns S_OK, E_OUTOFMEMORY or E_FAIL (internal error).
1002	*/
1003	HRESULT backupEx()
1004	{
1005	AssertMsgReturn(this->mData, ("data must not be NULL"), E_FAIL);
1006	if (this->mData && !mBackupData)
1007	{
1008	try
1009	{
1010	D pNewData = new D(this->mData);
1011	mBackupData = this->mData;
1012	this->mData = pNewData;
1013	}
1014	catch (std::bad_alloc &)
1015	{
1016	return E_OUTOFMEMORY;
1017	}
1018	}
1019	return S_OK;
1020	}
1021
1022	/**
1023	* Deletes new data created by #backup() and restores previous data pointer
1024	* stored in the backup area, making it active again.
1025	*/
1026	void rollback()
1027	{
1028	if (this->mData && mBackupData)
1029	{
1030	delete this->mData;
1031	this->mData = mBackupData;
1032	mBackupData = NULL;
1033	}
1034	}
1035
1036	/**
1037	* Commits current changes by deleting backed up data and clearing up the
1038	* backup area. The new data pointer created by #backup() remains active
1039	* and becomes the only managed pointer.
1040	*
1041	* This method is much faster than #commitCopy() (just a single pointer
1042	* assignment operation), but makes the previous data pointer invalid
1043	* (because it is freed). For this reason, this method must not be
1044	* used if it's possible that data managed by this instance is shared with
1045	* some other Shareable instance. See #commitCopy().
1046	*/
1047	void commit()
1048	{
1049	if (this->mData && mBackupData)
1050	{
1051	if (!this->mIsShared)
1052	delete mBackupData;
1053	mBackupData = NULL;
1054	this->mIsShared = false;
1055	}
1056	}
1057
1058	/**
1059	* Commits current changes by assigning new data to the previous data
1060	* pointer stored in the backup area using the assignment operator.
1061	* New data is deleted, the backup area is cleared and the previous data
1062	* pointer becomes active and the only managed pointer.
1063	*
1064	* This method is slower than #commit(), but it keeps the previous data
1065	* pointer valid (i.e. new data is copied to the same memory location).
1066	* For that reason it's safe to use this method on instances that share
1067	* managed data with other Shareable instances.
1068	*/
1069	void commitCopy()
1070	{
1071	if (this->mData && mBackupData)
1072	{
1073	mBackupData = (this->mData);
1074	delete this->mData;
1075	this->mData = mBackupData;
1076	mBackupData = NULL;
1077	}
1078	}
1079
1080	void assignCopy(const D *pData)
1081	{
1082	AssertMsg(this->mData, ("data must not be NULL"));
1083	AssertMsg(pData, ("data to copy must not be NULL"));
1084	if (this->mData && pData)
1085	{
1086	if (!mBackupData)
1087	{
1088	D pNewData = new D(pData);
1089	mBackupData = this->mData;
1090	this->mData = pNewData;
1091	}
1092	else
1093	this->mData = pData;
1094	}
1095	}
1096
1097	void assignCopy(const Backupable &d)
1098	{
1099	assignCopy(d.mData);
1100	}
1101
1102	bool isBackedUp() const
1103	{
1104	return mBackupData != NULL;
1105	}
1106
1107	D *backedUpData() const
1108	{
1109	return mBackupData;
1110	}
1111
1112	protected:
1113
1114	D *mBackupData;
1115	};
1116
1117	#endif /* !MAIN_INCLUDED_VirtualBoxBase_h */
1118

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source: vbox/trunk/src/VBox/Main/include/VirtualBoxBase.h@ 98102

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