VirtualBoxBase.h@ 58786

Last change on this file since 58786 was 57065, checked in by vboxsync, 9 years ago
Main: in the macro declaring empty constructor/destructor, use a virtual destructor to play safe regarding object freeing in case someone is doing tricks with supertypes etc.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 35.2 KB

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1	/* $Id: VirtualBoxBase.h 57065 2015-07-24 09:39:19Z vboxsync $ */
2	/** @file
3	* VirtualBox COM base classes definition
4	*/
5
6	/*
7	* Copyright (C) 2006-2015 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	#ifndef ____H_VIRTUALBOXBASEIMPL
19	#define ____H_VIRTUALBOXBASEIMPL
20
21	#include <iprt/cdefs.h>
22	#include <iprt/thread.h>
23
24	#include <list>
25	#include <map>
26
27	#include "ObjectState.h"
28
29	#include "VBox/com/AutoLock.h"
30	#include "VBox/com/string.h"
31	#include "VBox/com/Guid.h"
32
33	#include "VBox/com/VirtualBox.h"
34
35	// avoid including VBox/settings.h and VBox/xml.h; only declare the classes
36	namespace xml
37	{
38	class File;
39	}
40
41	namespace com
42	{
43	class ErrorInfo;
44	}
45
46	using namespace com;
47	using namespace util;
48
49	class VirtualBox;
50	class Machine;
51	class Medium;
52	class Host;
53	typedef std::list<ComObjPtr<Medium> > MediaList;
54	typedef std::list<Utf8Str> StringsList;
55
56	////////////////////////////////////////////////////////////////////////////////
57	//
58	// COM helpers
59	//
60	////////////////////////////////////////////////////////////////////////////////
61
62	#if !defined(VBOX_WITH_XPCOM)
63
64	#include <atlcom.h>
65
66	/* use a special version of the singleton class factory,
67	* see KB811591 in msdn for more info. */
68
69	#undef DECLARE_CLASSFACTORY_SINGLETON
70	#define DECLARE_CLASSFACTORY_SINGLETON(obj) DECLARE_CLASSFACTORY_EX(CMyComClassFactorySingleton<obj>)
71
72	template <class T>
73	class CMyComClassFactorySingleton : public CComClassFactory
74	{
75	public:
76	CMyComClassFactorySingleton() : m_hrCreate(S_OK){}
77	virtual ~CMyComClassFactorySingleton(){}
78	// IClassFactory
79	STDMETHOD(CreateInstance)(LPUNKNOWN pUnkOuter, REFIID riid, void** ppvObj)
80	{
81	HRESULT hRes = E_POINTER;
82	if (ppvObj != NULL)
83	{
84	*ppvObj = NULL;
85	// Aggregation is not supported in singleton objects.
86	ATLASSERT(pUnkOuter == NULL);
87	if (pUnkOuter != NULL)
88	hRes = CLASS_E_NOAGGREGATION;
89	else
90	{
91	if (m_hrCreate == S_OK && m_spObj == NULL)
92	{
93	Lock();
94	__try
95	{
96	// Fix: The following If statement was moved inside the __try statement.
97	// Did another thread arrive here first?
98	if (m_hrCreate == S_OK && m_spObj == NULL)
99	{
100	// lock the module to indicate activity
101	// (necessary for the monitor shutdown thread to correctly
102	// terminate the module in case when CreateInstance() fails)
103	_pAtlModule->Lock();
104	CComObjectCached<T> *p;
105	m_hrCreate = CComObjectCached<T>::CreateInstance(&p);
106	if (SUCCEEDED(m_hrCreate))
107	{
108	m_hrCreate = p->QueryInterface(IID_IUnknown, (void**)&m_spObj);
109	if (FAILED(m_hrCreate))
110	{
111	delete p;
112	}
113	}
114	_pAtlModule->Unlock();
115	}
116	}
117	__finally
118	{
119	Unlock();
120	}
121	}
122	if (m_hrCreate == S_OK)
123	{
124	hRes = m_spObj->QueryInterface(riid, ppvObj);
125	}
126	else
127	{
128	hRes = m_hrCreate;
129	}
130	}
131	}
132	return hRes;
133	}
134	HRESULT m_hrCreate;
135	CComPtr<IUnknown> m_spObj;
136	};
137
138	#endif /* !defined(VBOX_WITH_XPCOM) */
139
140	////////////////////////////////////////////////////////////////////////////////
141	//
142	// Macros
143	//
144	////////////////////////////////////////////////////////////////////////////////
145
146	/**
147	* Special version of the Assert macro to be used within VirtualBoxBase
148	* subclasses.
149	*
150	* In the debug build, this macro is equivalent to Assert.
151	* In the release build, this macro uses \|setError(E_FAIL, ...)\| to set the
152	* error info from the asserted expression.
153	*
154	* @see VirtualBoxBase::setError
155	*
156	* @param expr Expression which should be true.
157	*/
158	#define ComAssert(expr) \
159	do { \
160	if (RT_LIKELY(!!(expr))) \
161	{ /* likely */ } \
162	else \
163	{ \
164	AssertMsgFailed(("%s\n", #expr)); \
165	setError(E_FAIL, \
166	"Assertion failed: [%s] at '%s' (%d) in %s.\nPlease contact the product vendor!", \
167	#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
168	} \
169	} while (0)
170
171	/**
172	* Special version of the AssertFailed macro to be used within VirtualBoxBase
173	* subclasses.
174	*
175	* In the debug build, this macro is equivalent to AssertFailed.
176	* In the release build, this macro uses \|setError(E_FAIL, ...)\| to set the
177	* error info from the asserted expression.
178	*
179	* @see VirtualBoxBase::setError
180	*
181	*/
182	#define ComAssertFailed() \
183	do { \
184	AssertFailed(); \
185	setError(E_FAIL, \
186	"Assertion failed: at '%s' (%d) in %s.\nPlease contact the product vendor!", \
187	__FILE__, __LINE__, __PRETTY_FUNCTION__); \
188	} while (0)
189
190	/**
191	* Special version of the AssertMsg macro to be used within VirtualBoxBase
192	* subclasses.
193	*
194	* See ComAssert for more info.
195	*
196	* @param expr Expression which should be true.
197	* @param a printf argument list (in parenthesis).
198	*/
199	#define ComAssertMsg(expr, a) \
200	do { \
201	if (RT_LIKELY(!!(expr))) \
202	{ /* likely */ } \
203	else \
204	{ \
205	Utf8StrFmt MyAssertMsg a; /* may throw bad_alloc */ \
206	AssertMsgFailed(("%s\n", MyAssertMsg.c_str())); \
207	setError(E_FAIL, \
208	"Assertion failed: [%s] at '%s' (%d) in %s.\n%s.\nPlease contact the product vendor!", \
209	#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__, MyAssertMsg.c_str()); \
210	} \
211	} while (0)
212
213	/**
214	* Special version of the AssertMsgFailed macro to be used within VirtualBoxBase
215	* subclasses.
216	*
217	* See ComAssert for more info.
218	*
219	* @param a printf argument list (in parenthesis).
220	*/
221	#define ComAssertMsgFailed(a) \
222	do { \
223	Utf8StrFmt MyAssertMsg a; /* may throw bad_alloc */ \
224	AssertMsgFailed(("%s\n", MyAssertMsg.c_str())); \
225	setError(E_FAIL, \
226	"Assertion failed: at '%s' (%d) in %s.\n%s.\nPlease contact the product vendor!", \
227	__FILE__, __LINE__, __PRETTY_FUNCTION__, MyAssertMsg.c_str()); \
228	} while (0)
229
230	/**
231	* Special version of the AssertRC macro to be used within VirtualBoxBase
232	* subclasses.
233	*
234	* See ComAssert for more info.
235	*
236	* @param vrc VBox status code.
237	*/
238	#define ComAssertRC(vrc) ComAssertMsgRC(vrc, ("%Rra", vrc))
239
240	/**
241	* Special version of the AssertMsgRC macro to be used within VirtualBoxBase
242	* subclasses.
243	*
244	* See ComAssert for more info.
245	*
246	* @param vrc VBox status code.
247	* @param msg printf argument list (in parenthesis).
248	*/
249	#define ComAssertMsgRC(vrc, msg) ComAssertMsg(RT_SUCCESS(vrc), msg)
250
251	/**
252	* Special version of the AssertComRC macro to be used within VirtualBoxBase
253	* subclasses.
254	*
255	* See ComAssert for more info.
256	*
257	* @param hrc COM result code
258	*/
259	#define ComAssertComRC(hrc) ComAssertMsg(SUCCEEDED(hrc), ("COM RC=%Rhrc (0x%08X)", (hrc), (hrc)))
260
261
262	/** Special version of ComAssert that returns ret if expr fails */
263	#define ComAssertRet(expr, ret) \
264	do { ComAssert(expr); if (!(expr)) return (ret); } while (0)
265	/** Special version of ComAssertMsg that returns ret if expr fails */
266	#define ComAssertMsgRet(expr, a, ret) \
267	do { ComAssertMsg(expr, a); if (!(expr)) return (ret); } while (0)
268	/** Special version of ComAssertRC that returns ret if vrc does not succeed */
269	#define ComAssertRCRet(vrc, ret) \
270	do { ComAssertRC(vrc); if (!RT_SUCCESS(vrc)) return (ret); } while (0)
271	/** Special version of ComAssertComRC that returns ret if rc does not succeed */
272	#define ComAssertComRCRet(rc, ret) \
273	do { ComAssertComRC(rc); if (!SUCCEEDED(rc)) return (ret); } while (0)
274	/** Special version of ComAssertComRC that returns rc if rc does not succeed */
275	#define ComAssertComRCRetRC(rc) \
276	do { ComAssertComRC(rc); if (!SUCCEEDED(rc)) return (rc); } while (0)
277	/** Special version of ComAssertFailed that returns ret */
278	#define ComAssertFailedRet(ret) \
279	do { ComAssertFailed(); return (ret); } while (0)
280	/** Special version of ComAssertMsgFailed that returns ret */
281	#define ComAssertMsgFailedRet(msg, ret) \
282	do { ComAssertMsgFailed(msg); return (ret); } while (0)
283
284
285	/** Special version of ComAssert that returns void if expr fails */
286	#define ComAssertRetVoid(expr) \
287	do { ComAssert(expr); if (!(expr)) return; } while (0)
288	/** Special version of ComAssertMsg that returns void if expr fails */
289	#define ComAssertMsgRetVoid(expr, a) \
290	do { ComAssertMsg(expr, a); if (!(expr)) return; } while (0)
291	/** Special version of ComAssertRC that returns void if vrc does not succeed */
292	#define ComAssertRCRetVoid(vrc) \
293	do { ComAssertRC(vrc); if (!RT_SUCCESS(vrc)) return; } while (0)
294	/** Special version of ComAssertComRC that returns void if rc does not succeed */
295	#define ComAssertComRCRetVoid(rc) \
296	do { ComAssertComRC(rc); if (!SUCCEEDED(rc)) return; } while (0)
297	/** Special version of ComAssertFailed that returns void */
298	#define ComAssertFailedRetVoid() \
299	do { ComAssertFailed(); return; } while (0)
300	/** Special version of ComAssertMsgFailed that returns void */
301	#define ComAssertMsgFailedRetVoid(msg) \
302	do { ComAssertMsgFailed(msg); return; } while (0)
303
304
305	/** Special version of ComAssert that evaluates eval and breaks if expr fails */
306	#define ComAssertBreak(expr, eval) \
307	if (1) { ComAssert(expr); if (!(expr)) { eval; break; } } else do {} while (0)
308	/** Special version of ComAssertMsg that evaluates eval and breaks if expr fails */
309	#define ComAssertMsgBreak(expr, a, eval) \
310	if (1) { ComAssertMsg(expr, a); if (!(expr)) { eval; break; } } else do {} while (0)
311	/** Special version of ComAssertRC that evaluates eval and breaks if vrc does not succeed */
312	#define ComAssertRCBreak(vrc, eval) \
313	if (1) { ComAssertRC(vrc); if (!RT_SUCCESS(vrc)) { eval; break; } } else do {} while (0)
314	/** Special version of ComAssertFailed that evaluates eval and breaks */
315	#define ComAssertFailedBreak(eval) \
316	if (1) { ComAssertFailed(); { eval; break; } } else do {} while (0)
317	/** Special version of ComAssertMsgFailed that evaluates eval and breaks */
318	#define ComAssertMsgFailedBreak(msg, eval) \
319	if (1) { ComAssertMsgFailed (msg); { eval; break; } } else do {} while (0)
320	/** Special version of ComAssertComRC that evaluates eval and breaks if rc does not succeed */
321	#define ComAssertComRCBreak(rc, eval) \
322	if (1) { ComAssertComRC(rc); if (!SUCCEEDED(rc)) { eval; break; } } else do {} while (0)
323	/** Special version of ComAssertComRC that just breaks if rc does not succeed */
324	#define ComAssertComRCBreakRC(rc) \
325	if (1) { ComAssertComRC(rc); if (!SUCCEEDED(rc)) { break; } } else do {} while (0)
326
327
328	/** Special version of ComAssert that evaluates eval and throws it if expr fails */
329	#define ComAssertThrow(expr, eval) \
330	do { ComAssert(expr); if (!(expr)) { throw (eval); } } while (0)
331	/** Special version of ComAssertRC that evaluates eval and throws it if vrc does not succeed */
332	#define ComAssertRCThrow(vrc, eval) \
333	do { ComAssertRC(vrc); if (!RT_SUCCESS(vrc)) { throw (eval); } } while (0)
334	/** Special version of ComAssertComRC that evaluates eval and throws it if rc does not succeed */
335	#define ComAssertComRCThrow(rc, eval) \
336	do { ComAssertComRC(rc); if (!SUCCEEDED(rc)) { throw (eval); } } while (0)
337	/** Special version of ComAssertComRC that just throws rc if rc does not succeed */
338	#define ComAssertComRCThrowRC(rc) \
339	do { ComAssertComRC(rc); if (!SUCCEEDED(rc)) { throw rc; } } while (0)
340	/** Special version of ComAssert that throws eval */
341	#define ComAssertFailedThrow(eval) \
342	do { ComAssertFailed(); { throw (eval); } } while (0)
343
344	////////////////////////////////////////////////////////////////////////////////
345
346	/**
347	* Checks that the pointer argument is not NULL and returns E_INVALIDARG +
348	* extended error info on failure.
349	* @param arg Input pointer-type argument (strings, interface pointers...)
350	*/
351	#define CheckComArgNotNull(arg) \
352	do { \
353	if (RT_LIKELY((arg) != NULL)) \
354	{ /* likely */ }\
355	else \
356	return setError(E_INVALIDARG, tr("Argument %s is NULL"), #arg); \
357	} while (0)
358
359	/**
360	* Checks that the pointer argument is a valid pointer or NULL and returns
361	* E_INVALIDARG + extended error info on failure.
362	* @param arg Input pointer-type argument (strings, interface pointers...)
363	*/
364	#define CheckComArgMaybeNull(arg) \
365	do { \
366	if (RT_LIKELY(RT_VALID_PTR(arg) \|\| (arg) == NULL)) \
367	{ /* likely */ }\
368	else \
369	return setError(E_INVALIDARG, tr("Argument %s is an invalid pointer"), #arg); \
370	} while (0)
371
372	/**
373	* Checks that the given pointer to an argument is valid and returns
374	* E_POINTER + extended error info otherwise.
375	* @param arg Pointer argument.
376	*/
377	#define CheckComArgPointerValid(arg) \
378	do { \
379	if (RT_LIKELY(RT_VALID_PTR(arg))) \
380	{ /* likely */ }\
381	else \
382	return setError(E_POINTER, \
383	tr("Argument %s points to invalid memory location (%p)"), \
384	#arg, (void *)(arg)); \
385	} while (0)
386
387	/**
388	* Checks that safe array argument is not NULL and returns E_INVALIDARG +
389	* extended error info on failure.
390	* @param arg Input safe array argument (strings, interface pointers...)
391	*/
392	#define CheckComArgSafeArrayNotNull(arg) \
393	do { \
394	if (RT_LIKELY(!ComSafeArrayInIsNull(arg))) \
395	{ /* likely */ }\
396	else \
397	return setError(E_INVALIDARG, tr("Argument %s is NULL"), #arg); \
398	} while (0)
399
400	/**
401	* Checks that a string input argument is valid (not NULL or obviously invalid
402	* pointer), returning E_INVALIDARG + extended error info if invalid.
403	* @param a_bstrIn Input string argument (IN_BSTR).
404	*/
405	#define CheckComArgStr(a_bstrIn) \
406	do { \
407	IN_BSTR const bstrInCheck = (a_bstrIn); /* type check */ \
408	if (RT_LIKELY(RT_VALID_PTR(bstrInCheck))) \
409	{ /* likely */ }\
410	else \
411	return setError(E_INVALIDARG, tr("Argument %s is an invalid pointer"), #a_bstrIn); \
412	} while (0)
413	/**
414	* Checks that the string argument is not a NULL, a invalid pointer or an empty
415	* string, returning E_INVALIDARG + extended error info on failure.
416	* @param a_bstrIn Input string argument (BSTR etc.).
417	*/
418	#define CheckComArgStrNotEmptyOrNull(a_bstrIn) \
419	do { \
420	IN_BSTR const bstrInCheck = (a_bstrIn); /* type check */ \
421	if (RT_LIKELY(RT_VALID_PTR(bstrInCheck) && *(bstrInCheck) != '\0')) \
422	{ /* likely */ }\
423	else \
424	return setError(E_INVALIDARG, tr("Argument %s is empty or an invalid pointer"), #a_bstrIn); \
425	} while (0)
426
427	/**
428	* Converts the Guid input argument (string) to a Guid object, returns with
429	* E_INVALIDARG and error message on failure.
430	*
431	* @param a_Arg Argument.
432	* @param a_GuidVar The Guid variable name.
433	*/
434	#define CheckComArgGuid(a_Arg, a_GuidVar) \
435	do { \
436	Guid tmpGuid(a_Arg); \
437	(a_GuidVar) = tmpGuid; \
438	if (RT_LIKELY((a_GuidVar).isValid())) \
439	{ /* likely */ }\
440	else \
441	return setError(E_INVALIDARG, \
442	tr("GUID argument %s is not valid (\"%ls\")"), #a_Arg, Bstr(a_Arg).raw()); \
443	} while (0)
444
445	/**
446	* Checks that the given expression (that must involve the argument) is true and
447	* returns E_INVALIDARG + extended error info on failure.
448	* @param arg Argument.
449	* @param expr Expression to evaluate.
450	*/
451	#define CheckComArgExpr(arg, expr) \
452	do { \
453	if (RT_LIKELY(!!(expr))) \
454	{ /* likely */ }\
455	else \
456	return setError(E_INVALIDARG, \
457	tr("Argument %s is invalid (must be %s)"), #arg, #expr); \
458	} while (0)
459
460	/**
461	* Checks that the given expression (that must involve the argument) is true and
462	* returns E_INVALIDARG + extended error info on failure. The error message must
463	* be customized.
464	* @param arg Argument.
465	* @param expr Expression to evaluate.
466	* @param msg Parenthesized printf-like expression (must start with a verb,
467	* like "must be one of...", "is not within...").
468	*/
469	#define CheckComArgExprMsg(arg, expr, msg) \
470	do { \
471	if (RT_LIKELY(!!(expr))) \
472	{ /* likely */ }\
473	else \
474	return setError(E_INVALIDARG, tr("Argument %s %s"), \
475	#arg, Utf8StrFmt msg .c_str()); \
476	} while (0)
477
478	/**
479	* Checks that the given pointer to an output argument is valid and returns
480	* E_POINTER + extended error info otherwise.
481	* @param arg Pointer argument.
482	*/
483	#define CheckComArgOutPointerValid(arg) \
484	do { \
485	if (RT_LIKELY(RT_VALID_PTR(arg))) \
486	{ /* likely */ }\
487	else \
488	return setError(E_POINTER, \
489	tr("Output argument %s points to invalid memory location (%p)"), \
490	#arg, (void *)(arg)); \
491	} while (0)
492
493	/**
494	* Checks that the given pointer to an output safe array argument is valid and
495	* returns E_POINTER + extended error info otherwise.
496	* @param arg Safe array argument.
497	*/
498	#define CheckComArgOutSafeArrayPointerValid(arg) \
499	do { \
500	if (RT_LIKELY(!ComSafeArrayOutIsNull(arg))) \
501	{ /* likely */ }\
502	else \
503	return setError(E_POINTER, \
504	tr("Output argument %s points to invalid memory location (%p)"), \
505	#arg, (void*)(arg)); \
506	} while (0)
507
508	/**
509	* Sets the extended error info and returns E_NOTIMPL.
510	*/
511	#define ReturnComNotImplemented() \
512	do { \
513	return setError(E_NOTIMPL, tr("Method %s is not implemented"), __FUNCTION__); \
514	} while (0)
515
516	/**
517	* Declares an empty constructor and destructor for the given class.
518	* This is useful to prevent the compiler from generating the default
519	* ctor and dtor, which in turn allows to use forward class statements
520	* (instead of including their header files) when declaring data members of
521	* non-fundamental types with constructors (which are always called implicitly
522	* by constructors and by the destructor of the class).
523	*
524	* This macro is to be placed within (the public section of) the class
525	* declaration. Its counterpart, DEFINE_EMPTY_CTOR_DTOR, must be placed
526	* somewhere in one of the translation units (usually .cpp source files).
527	*
528	* @param cls class to declare a ctor and dtor for
529	*/
530	#define DECLARE_EMPTY_CTOR_DTOR(cls) cls(); virtual ~cls();
531
532	/**
533	* Defines an empty constructor and destructor for the given class.
534	* See DECLARE_EMPTY_CTOR_DTOR for more info.
535	*/
536	#define DEFINE_EMPTY_CTOR_DTOR(cls) \
537	cls::cls() { /empty/ } \
538	cls::~cls() { /empty/ }
539
540	/**
541	* A variant of 'throw' that hits a debug breakpoint first to make
542	* finding the actual thrower possible.
543	*/
544	#ifdef DEBUG
545	# define DebugBreakThrow(a) \
546	do { \
547	RTAssertDebugBreak(); \
548	throw (a); \
549	} while (0)
550	#else
551	# define DebugBreakThrow(a) throw (a)
552	#endif
553
554	/**
555	* Parent class of VirtualBoxBase which enables translation support (which
556	* Main doesn't have yet, but this provides the tr() function which will one
557	* day provide translations).
558	*
559	* This class sits in between Lockable and VirtualBoxBase only for the one
560	* reason that the USBProxyService wants translation support but is not
561	* implemented as a COM object, which VirtualBoxBase implies.
562	*/
563	class ATL_NO_VTABLE VirtualBoxTranslatable
564	: public Lockable
565	{
566	public:
567
568	/**
569	* Placeholder method with which translations can one day be implemented
570	* in Main. This gets called by the tr() function.
571	* @param context
572	* @param pcszSourceText
573	* @param comment
574	* @return
575	*/
576	static const char translate(const char context,
577	const char *pcszSourceText,
578	const char *comment = 0)
579	{
580	NOREF(context);
581	NOREF(comment);
582	return pcszSourceText;
583	}
584
585	/**
586	* Translates the given text string by calling translate() and passing
587	* the name of the C class as the first argument ("context of
588	* translation"). See VirtualBoxBase::translate() for more info.
589	*
590	* @param aSourceText String to translate.
591	* @param aComment Comment to the string to resolve possible
592	* ambiguities (NULL means no comment).
593	*
594	* @return Translated version of the source string in UTF-8 encoding, or
595	* the source string itself if the translation is not found in the
596	* specified context.
597	*/
598	inline static const char tr(const char pcszSourceText,
599	const char *aComment = NULL)
600	{
601	return VirtualBoxTranslatable::translate(NULL, // getComponentName(), eventually
602	pcszSourceText,
603	aComment);
604	}
605	};
606
607	////////////////////////////////////////////////////////////////////////////////
608	//
609	// VirtualBoxBase
610	//
611	////////////////////////////////////////////////////////////////////////////////
612
613	#define VIRTUALBOXBASE_ADD_VIRTUAL_COMPONENT_METHODS(cls, iface) \
614	virtual const IID& getClassIID() const \
615	{ \
616	return cls::getStaticClassIID(); \
617	} \
618	static const IID& getStaticClassIID() \
619	{ \
620	return COM_IIDOF(iface); \
621	} \
622	virtual const char* getComponentName() const \
623	{ \
624	return cls::getStaticComponentName(); \
625	} \
626	static const char* getStaticComponentName() \
627	{ \
628	return #cls; \
629	}
630
631	/**
632	* VIRTUALBOXBASE_ADD_ERRORINFO_SUPPORT:
633	* This macro must be used once in the declaration of any class derived
634	* from VirtualBoxBase. It implements the pure virtual getClassIID() and
635	* getComponentName() methods. If this macro is not present, instances
636	* of a class derived from VirtualBoxBase cannot be instantiated.
637	*
638	* @param X The class name, e.g. "Class".
639	* @param IX The interface name which this class implements, e.g. "IClass".
640	*/
641	#ifdef VBOX_WITH_XPCOM
642	#define VIRTUALBOXBASE_ADD_ERRORINFO_SUPPORT(cls, iface) \
643	VIRTUALBOXBASE_ADD_VIRTUAL_COMPONENT_METHODS(cls, iface)
644	#else // #ifdef VBOX_WITH_XPCOM
645	#define VIRTUALBOXBASE_ADD_ERRORINFO_SUPPORT(cls, iface) \
646	VIRTUALBOXBASE_ADD_VIRTUAL_COMPONENT_METHODS(cls, iface) \
647	STDMETHOD(InterfaceSupportsErrorInfo)(REFIID riid) \
648	{ \
649	const _ATL_INTMAP_ENTRY* pEntries = cls::_GetEntries(); \
650	Assert(pEntries); \
651	if (!pEntries) \
652	return S_FALSE; \
653	BOOL bSupports = FALSE; \
654	BOOL bISupportErrorInfoFound = FALSE; \
655	while (pEntries->pFunc != NULL && !bSupports) \
656	{ \
657	if (!bISupportErrorInfoFound) \
658	bISupportErrorInfoFound = InlineIsEqualGUID(*(pEntries->piid), IID_ISupportErrorInfo); \
659	else \
660	bSupports = InlineIsEqualGUID(*(pEntries->piid), riid); \
661	pEntries++; \
662	} \
663	Assert(bISupportErrorInfoFound); \
664	return bSupports ? S_OK : S_FALSE; \
665	}
666	#endif // #ifdef VBOX_WITH_XPCOM
667
668	/**
669	* Abstract base class for all component classes implementing COM
670	* interfaces of the VirtualBox COM library.
671	*
672	* Declares functionality that should be available in all components.
673	*
674	* The object state logic is documented in ObjectState.h.
675	*/
676	class ATL_NO_VTABLE VirtualBoxBase
677	: public VirtualBoxTranslatable,
678	public CComObjectRootEx<CComMultiThreadModel>
679	#if !defined (VBOX_WITH_XPCOM)
680	, public ISupportErrorInfo
681	#endif
682	{
683	protected:
684	#ifdef RT_OS_WINDOWS
685	CComPtr <IUnknown> m_pUnkMarshaler;
686	#endif
687
688	HRESULT BaseFinalConstruct()
689	{
690	#ifdef RT_OS_WINDOWS
691	return CoCreateFreeThreadedMarshaler(this, //GetControllingUnknown(),
692	&m_pUnkMarshaler.p);
693	#else
694	return S_OK;
695	#endif
696	}
697
698	void BaseFinalRelease()
699	{
700	#ifdef RT_OS_WINDOWS
701	m_pUnkMarshaler.Release();
702	#endif
703	}
704
705
706	public:
707	VirtualBoxBase();
708	virtual ~VirtualBoxBase();
709
710	/**
711	* Uninitialization method.
712	*
713	* Must be called by all final implementations (component classes) when the
714	* last reference to the object is released, before calling the destructor.
715	*
716	* @note Never call this method the AutoCaller scope or after the
717	* ObjectState::addCaller() call not paired by
718	* ObjectState::releaseCaller() because it is a guaranteed deadlock.
719	* See AutoUninitSpan and AutoCaller.h/ObjectState.h for details.
720	*/
721	virtual void uninit()
722	{ }
723
724	/**
725	*/
726	ObjectState &getObjectState()
727	{
728	return mState;
729	}
730
731	/**
732	* Pure virtual method for simple run-time type identification without
733	* having to enable C++ RTTI.
734	*
735	* This must be implemented by every subclass deriving from VirtualBoxBase;
736	* use the VIRTUALBOXBASE_ADD_ERRORINFO_SUPPORT macro to do that most easily.
737	*/
738	virtual const IID& getClassIID() const = 0;
739
740	/**
741	* Pure virtual method for simple run-time type identification without
742	* having to enable C++ RTTI.
743	*
744	* This must be implemented by every subclass deriving from VirtualBoxBase;
745	* use the VIRTUALBOXBASE_ADD_ERRORINFO_SUPPORT macro to do that most easily.
746	*/
747	virtual const char* getComponentName() const = 0;
748
749	/**
750	* Virtual method which determines the locking class to be used for validating
751	* lock order with the standard member lock handle. This method is overridden
752	* in a number of subclasses.
753	*/
754	virtual VBoxLockingClass getLockingClass() const
755	{
756	return LOCKCLASS_OTHEROBJECT;
757	}
758
759	virtual RWLockHandle *lockHandle() const;
760
761	static HRESULT handleUnexpectedExceptions(VirtualBoxBase *const aThis, RT_SRC_POS_DECL);
762
763	static HRESULT setErrorInternal(HRESULT aResultCode,
764	const GUID &aIID,
765	const char *aComponent,
766	Utf8Str aText,
767	bool aWarning,
768	bool aLogIt,
769	LONG aResultDetail = 0);
770	static void clearError(void);
771
772	HRESULT setError(HRESULT aResultCode);
773	HRESULT setError(HRESULT aResultCode, const char *pcsz, ...);
774	HRESULT setError(const ErrorInfo &ei);
775	HRESULT setErrorVrc(int vrc);
776	HRESULT setErrorVrc(int vrc, const char *pcszMsgFmt, ...);
777	HRESULT setErrorBoth(HRESULT hrc, int vrc);
778	HRESULT setErrorBoth(HRESULT hrc, int vrc, const char *pcszMsgFmt, ...);
779	HRESULT setWarning(HRESULT aResultCode, const char *pcsz, ...);
780	HRESULT setErrorNoLog(HRESULT aResultCode, const char *pcsz, ...);
781
782
783	/** Initialize COM for a new thread. */
784	static HRESULT initializeComForThread(void)
785	{
786	#ifndef VBOX_WITH_XPCOM
787	HRESULT hrc = CoInitializeEx(NULL, COINIT_MULTITHREADED \| COINIT_DISABLE_OLE1DDE \| COINIT_SPEED_OVER_MEMORY);
788	AssertComRCReturn(hrc, hrc);
789	#endif
790	return S_OK;
791	}
792
793	/** Uninitializes COM for a dying thread. */
794	static void uninitializeComForThread(void)
795	{
796	#ifndef VBOX_WITH_XPCOM
797	CoUninitialize();
798	#endif
799	}
800
801
802	private:
803	/** Object for representing object state */
804	ObjectState mState;
805
806	/** User-level object lock for subclasses */
807	mutable RWLockHandle *mObjectLock;
808	};
809
810	/**
811	* Dummy macro that is used to shut down Qt's lupdate tool warnings in some
812	* situations. This macro needs to be present inside (better at the very
813	* beginning) of the declaration of the class that inherits from
814	* VirtualBoxTranslatable, to make lupdate happy.
815	*/
816	#define Q_OBJECT
817
818	////////////////////////////////////////////////////////////////////////////////
819
820	////////////////////////////////////////////////////////////////////////////////
821
822
823	/**
824	* Simple template that manages data structure allocation/deallocation
825	* and supports data pointer sharing (the instance that shares the pointer is
826	* not responsible for memory deallocation as opposed to the instance that
827	* owns it).
828	*/
829	template <class D>
830	class Shareable
831	{
832	public:
833
834	Shareable() : mData(NULL), mIsShared(FALSE) {}
835	~Shareable() { free(); }
836
837	void allocate() { attach(new D); }
838
839	virtual void free() {
840	if (mData) {
841	if (!mIsShared)
842	delete mData;
843	mData = NULL;
844	mIsShared = false;
845	}
846	}
847
848	void attach(D *d) {
849	AssertMsg(d, ("new data must not be NULL"));
850	if (d && mData != d) {
851	if (mData && !mIsShared)
852	delete mData;
853	mData = d;
854	mIsShared = false;
855	}
856	}
857
858	void attach(Shareable &d) {
859	AssertMsg(
860	d.mData == mData \|\| !d.mIsShared,
861	("new data must not be shared")
862	);
863	if (this != &d && !d.mIsShared) {
864	attach(d.mData);
865	d.mIsShared = true;
866	}
867	}
868
869	void share(D *d) {
870	AssertMsg(d, ("new data must not be NULL"));
871	if (mData != d) {
872	if (mData && !mIsShared)
873	delete mData;
874	mData = d;
875	mIsShared = true;
876	}
877	}
878
879	void share(const Shareable &d) { share(d.mData); }
880
881	void attachCopy(const D *d) {
882	AssertMsg(d, ("data to copy must not be NULL"));
883	if (d)
884	attach(new D(*d));
885	}
886
887	void attachCopy(const Shareable &d) {
888	attachCopy(d.mData);
889	}
890
891	virtual D *detach() {
892	D *d = mData;
893	mData = NULL;
894	mIsShared = false;
895	return d;
896	}
897
898	D *data() const {
899	return mData;
900	}
901
902	D *operator->() const {
903	AssertMsg(mData, ("data must not be NULL"));
904	return mData;
905	}
906
907	bool isNull() const { return mData == NULL; }
908	bool operator!() const { return isNull(); }
909
910	bool isShared() const { return mIsShared; }
911
912	protected:
913
914	D *mData;
915	bool mIsShared;
916	};
917
918	/**
919	* Simple template that enhances Shareable<> and supports data
920	* backup/rollback/commit (using the copy constructor of the managed data
921	* structure).
922	*/
923	template<class D>
924	class Backupable : public Shareable<D>
925	{
926	public:
927
928	Backupable() : Shareable<D>(), mBackupData(NULL) {}
929
930	void free()
931	{
932	AssertMsg(this->mData \|\| !mBackupData, ("backup must be NULL if data is NULL"));
933	rollback();
934	Shareable<D>::free();
935	}
936
937	D *detach()
938	{
939	AssertMsg(this->mData \|\| !mBackupData, ("backup must be NULL if data is NULL"));
940	rollback();
941	return Shareable<D>::detach();
942	}
943
944	void share(const Backupable &d)
945	{
946	AssertMsg(!d.isBackedUp(), ("data to share must not be backed up"));
947	if (!d.isBackedUp())
948	Shareable<D>::share(d.mData);
949	}
950
951	/**
952	* Stores the current data pointer in the backup area, allocates new data
953	* using the copy constructor on current data and makes new data active.
954	*
955	* @deprecated Use backupEx to avoid throwing wild out-of-memory exceptions.
956	*/
957	void backup()
958	{
959	AssertMsg(this->mData, ("data must not be NULL"));
960	if (this->mData && !mBackupData)
961	{
962	D pNewData = new D(this->mData);
963	mBackupData = this->mData;
964	this->mData = pNewData;
965	}
966	}
967
968	/**
969	* Stores the current data pointer in the backup area, allocates new data
970	* using the copy constructor on current data and makes new data active.
971	*
972	* @returns S_OK, E_OUTOFMEMORY or E_FAIL (internal error).
973	*/
974	HRESULT backupEx()
975	{
976	AssertMsgReturn(this->mData, ("data must not be NULL"), E_FAIL);
977	if (this->mData && !mBackupData)
978	{
979	try
980	{
981	D pNewData = new D(this->mData);
982	mBackupData = this->mData;
983	this->mData = pNewData;
984	}
985	catch (std::bad_alloc &)
986	{
987	return E_OUTOFMEMORY;
988	}
989	}
990	return S_OK;
991	}
992
993	/**
994	* Deletes new data created by #backup() and restores previous data pointer
995	* stored in the backup area, making it active again.
996	*/
997	void rollback()
998	{
999	if (this->mData && mBackupData)
1000	{
1001	delete this->mData;
1002	this->mData = mBackupData;
1003	mBackupData = NULL;
1004	}
1005	}
1006
1007	/**
1008	* Commits current changes by deleting backed up data and clearing up the
1009	* backup area. The new data pointer created by #backup() remains active
1010	* and becomes the only managed pointer.
1011	*
1012	* This method is much faster than #commitCopy() (just a single pointer
1013	* assignment operation), but makes the previous data pointer invalid
1014	* (because it is freed). For this reason, this method must not be
1015	* used if it's possible that data managed by this instance is shared with
1016	* some other Shareable instance. See #commitCopy().
1017	*/
1018	void commit()
1019	{
1020	if (this->mData && mBackupData)
1021	{
1022	if (!this->mIsShared)
1023	delete mBackupData;
1024	mBackupData = NULL;
1025	this->mIsShared = false;
1026	}
1027	}
1028
1029	/**
1030	* Commits current changes by assigning new data to the previous data
1031	* pointer stored in the backup area using the assignment operator.
1032	* New data is deleted, the backup area is cleared and the previous data
1033	* pointer becomes active and the only managed pointer.
1034	*
1035	* This method is slower than #commit(), but it keeps the previous data
1036	* pointer valid (i.e. new data is copied to the same memory location).
1037	* For that reason it's safe to use this method on instances that share
1038	* managed data with other Shareable instances.
1039	*/
1040	void commitCopy()
1041	{
1042	if (this->mData && mBackupData)
1043	{
1044	mBackupData = (this->mData);
1045	delete this->mData;
1046	this->mData = mBackupData;
1047	mBackupData = NULL;
1048	}
1049	}
1050
1051	void assignCopy(const D *pData)
1052	{
1053	AssertMsg(this->mData, ("data must not be NULL"));
1054	AssertMsg(pData, ("data to copy must not be NULL"));
1055	if (this->mData && pData)
1056	{
1057	if (!mBackupData)
1058	{
1059	D pNewData = new D(pData);
1060	mBackupData = this->mData;
1061	this->mData = pNewData;
1062	}
1063	else
1064	this->mData = pData;
1065	}
1066	}
1067
1068	void assignCopy(const Backupable &d)
1069	{
1070	assignCopy(d.mData);
1071	}
1072
1073	bool isBackedUp() const
1074	{
1075	return mBackupData != NULL;
1076	}
1077
1078	D *backedUpData() const
1079	{
1080	return mBackupData;
1081	}
1082
1083	protected:
1084
1085	D *mBackupData;
1086	};
1087
1088	#endif // !____H_VIRTUALBOXBASEIMPL
1089

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source: vbox/trunk/src/VBox/Main/include/VirtualBoxBase.h@ 58786

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