defs.h@ 97964

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1	/** @file
2	* MS COM / XPCOM Abstraction Layer - Common Definitions.
3	*/
4
5	/*
6	* Copyright (C) 2006-2022 Oracle and/or its affiliates.
7	*
8	* This file is part of VirtualBox base platform packages, as
9	* available from https://www.virtualbox.org.
10	*
11	* This program is free software; you can redistribute it and/or
12	* modify it under the terms of the GNU General Public License
13	* as published by the Free Software Foundation, in version 3 of the
14	* License.
15	*
16	* This program is distributed in the hope that it will be useful, but
17	* WITHOUT ANY WARRANTY; without even the implied warranty of
18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19	* General Public License for more details.
20	*
21	* You should have received a copy of the GNU General Public License
22	* along with this program; if not, see <https://www.gnu.org/licenses>.
23	*
24	* The contents of this file may alternatively be used under the terms
25	* of the Common Development and Distribution License Version 1.0
26	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
27	* in the VirtualBox distribution, in which case the provisions of the
28	* CDDL are applicable instead of those of the GPL.
29	*
30	* You may elect to license modified versions of this file under the
31	* terms and conditions of either the GPL or the CDDL or both.
32	*
33	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
34	*/
35
36	#ifndef VBOX_INCLUDED_com_defs_h
37	#define VBOX_INCLUDED_com_defs_h
38	#ifndef RT_WITHOUT_PRAGMA_ONCE
39	# pragma once
40	#endif
41
42	/* Make sure all the stdint.h macros are included - must come first! */
43	#ifndef __STDC_LIMIT_MACROS
44	# define __STDC_LIMIT_MACROS
45	#endif
46	#ifndef __STDC_CONSTANT_MACROS
47	# define __STDC_CONSTANT_MACROS
48	#endif
49
50	#if defined (RT_OS_OS2)
51
52	# if defined(RT_MAX) && RT_MAX != 22
53	# undef RT_MAX
54	# define REDEFINE_RT_MAX
55	# endif
56	# undef RT_MAX
57
58	/* Make sure OS/2 Toolkit headers are pulled in to have BOOL/ULONG/etc. typedefs
59	* already defined in order to be able to redefine them using #define. */
60	# define INCL_BASE
61	# define INCL_PM
62	# include <os2.h>
63
64	/* OS/2 Toolkit defines TRUE and FALSE */
65	# undef FALSE
66	# undef TRUE
67
68	/* */
69	# undef RT_MAX
70	# ifdef REDEFINE_RT_MAX
71	# define RT_MAX(Value1, Value2) ( (Value1) >= (Value2) ? (Value1) : (Value2) )
72	# endif
73
74	#endif /* defined(RT_OS_OS2) */
75
76	/* Include iprt/types.h (which also includes iprt/types.h) now to make sure iprt
77	* gets to stdint.h first, otherwise a system/xpcom header might beat us and
78	* we'll be without the macros that are optional in C++. */
79	#include <iprt/types.h>
80
81
82
83	/** @defgroup grp_com_defs Common Definitions
84	* @ingroup grp_com
85	* @{
86	*/
87
88	#if !defined(VBOX_WITH_XPCOM)
89
90	#ifdef RT_OS_WINDOWS
91
92	// Windows COM
93	/////////////////////////////////////////////////////////////////////////////
94
95	# include <iprt/win/objbase.h>
96	# ifndef VBOX_COM_NO_ATL
97
98	/* Do not use actual ATL, just provide a superficial lookalike ourselves. */
99	# include <VBox/com/microatl.h>
100	# endif /* VBOX_COM_NO_ATL */
101
102	# define NS_DECL_ISUPPORTS
103	# define NS_IMPL_ISUPPORTS1_CI(a, b)
104
105	/* these are XPCOM only, one for every interface implemented */
106	# define NS_DECL_ISUPPORTS
107
108	/** Returns @c true if @a rc represents a warning result code */
109	# define SUCCEEDED_WARNING(rc) (SUCCEEDED(rc) && (rc) != S_OK)
110
111	/** Tests is a COM result code indicates that the process implementing the
112	* interface is dead.
113	*
114	* COM status codes:
115	* 0x800706ba - RPC_S_SERVER_UNAVAILABLE. Killed before call was made.
116	* 0x800706be - RPC_S_CALL_FAILED. Killed after call was made.
117	* 0x800706bf - RPC_S_CALL_FAILED_DNE. Not observed, but should be
118	* matter of timing.
119	* 0x80010108 - RPC_E_DISCONNECTED. Observed deregistering
120	* python event listener.
121	* 0x800706b5 - RPC_S_UNKNOWN_IF. Observed deregistering python
122	* event listener
123	*/
124	#define FAILED_DEAD_INTERFACE(rc) \
125	( (rc) == HRESULT_FROM_WIN32(RPC_S_SERVER_UNAVAILABLE) \
126	\|\| (rc) == HRESULT_FROM_WIN32(RPC_S_CALL_FAILED) \
127	\|\| (rc) == HRESULT_FROM_WIN32(RPC_S_CALL_FAILED_DNE) \
128	\|\| (rc) == RPC_E_DISCONNECTED \
129	)
130
131	/** Immutable BSTR string */
132	typedef const OLECHAR *CBSTR;
133
134	/** Input BSTR argument of interface method declaration. */
135	#define IN_BSTR BSTR
136
137	/** Input GUID argument of interface method declaration. */
138	#define IN_GUID GUID
139	/** Output GUID argument of interface method declaration. */
140	#define OUT_GUID GUID *
141
142	/** Makes the name of the getter interface function (n must be capitalized). */
143	#define COMGETTER(n) get_##n
144	/** Makes the name of the setter interface function (n must be capitalized). */
145	#define COMSETTER(n) put_##n
146
147	/**
148	* Declares an input safearray parameter in the COM method implementation. Also
149	* used to declare the COM attribute setter parameter. Corresponds to either of
150	* the following XIDL definitions:
151	* <pre>
152	* <param name="arg" ... dir="in" safearray="yes"/>
153	* ...
154	* <attribute name="arg" ... safearray="yes"/>
155	* </pre>
156	*
157	* The method implementation should use the com::SafeArray helper class to work
158	* with parameters declared using this define.
159	*
160	* @param aType Array element type.
161	* @param aArg Parameter/attribute name.
162	*/
163	#define ComSafeArrayIn(aType, aArg) SAFEARRAY *aArg
164
165	/**
166	* Expands to @c true if the given input safearray parameter is a "null pointer"
167	* which makes it impossible to use it for reading safearray data.
168	*/
169	#define ComSafeArrayInIsNull(aArg) ((aArg) == NULL)
170
171	/**
172	* Wraps the given parameter name to generate an expression that is suitable for
173	* passing the parameter to functions that take input safearray parameters
174	* declared using the ComSafeArrayIn macro.
175	*
176	* @param aArg Parameter name to wrap. The given parameter must be declared
177	* within the calling function using the ComSafeArrayIn macro.
178	*/
179	#define ComSafeArrayInArg(aArg) aArg
180
181	/**
182	* Declares an output safearray parameter in the COM method implementation. Also
183	* used to declare the COM attribute getter parameter. Corresponds to either of
184	* the following XIDL definitions:
185	* <pre>
186	* <param name="arg" ... dir="out" safearray="yes"/>
187	* <param name="arg" ... dir="return" safearray="yes"/>
188	* ...
189	* <attribute name="arg" ... safearray="yes"/>
190	* </pre>
191	*
192	* The method implementation should use the com::SafeArray helper class to work
193	* with parameters declared using this define.
194	*
195	* @param aType Array element type.
196	* @param aArg Parameter/attribute name.
197	*/
198	#define ComSafeArrayOut(aType, aArg) SAFEARRAY **aArg
199
200	/**
201	* Expands to @c true if the given output safearray parameter is a "null
202	* pointer" which makes it impossible to use it for returning a safearray.
203	*/
204	#define ComSafeArrayOutIsNull(aArg) ((aArg) == NULL)
205
206	/**
207	* Wraps the given parameter name to generate an expression that is suitable for
208	* passing the parameter to functions that take output safearray parameters
209	* declared using the ComSafeArrayOut marco.
210	*
211	* @param aArg Parameter name to wrap. The given parameter must be declared
212	* within the calling function using the ComSafeArrayOut macro.
213	*/
214	#define ComSafeArrayOutArg(aArg) aArg
215
216	/**
217	* Version of ComSafeArrayIn for GUID.
218	* @param aArg Parameter name to wrap.
219	*/
220	#define ComSafeGUIDArrayIn(aArg) SAFEARRAY *aArg
221
222	/**
223	* Version of ComSafeArrayInIsNull for GUID.
224	* @param aArg Parameter name to wrap.
225	*/
226	#define ComSafeGUIDArrayInIsNull(aArg) ComSafeArrayInIsNull(aArg)
227
228	/**
229	* Version of ComSafeArrayInArg for GUID.
230	* @param aArg Parameter name to wrap.
231	*/
232	#define ComSafeGUIDArrayInArg(aArg) ComSafeArrayInArg(aArg)
233
234	/**
235	* Version of ComSafeArrayOut for GUID.
236	* @param aArg Parameter name to wrap.
237	*/
238	#define ComSafeGUIDArrayOut(aArg) SAFEARRAY **aArg
239
240	/**
241	* Version of ComSafeArrayOutIsNull for GUID.
242	* @param aArg Parameter name to wrap.
243	*/
244	#define ComSafeGUIDArrayOutIsNull(aArg) ComSafeArrayOutIsNull(aArg)
245
246	/**
247	* Version of ComSafeArrayOutArg for GUID.
248	* @param aArg Parameter name to wrap.
249	*/
250	#define ComSafeGUIDArrayOutArg(aArg) ComSafeArrayOutArg(aArg)
251
252	/**
253	* Gets size of safearray parameter.
254	* @param aArg Parameter name.
255	*/
256	#define ComSafeArraySize(aArg) ((aArg) == NULL ? 0 : (aArg)->rgsabound[0].cElements)
257
258	/**
259	* Apply RT_NOREF_PV to a safearray parameter.
260	* @param aArg Parameter name.
261	*/
262	#define ComSafeArrayNoRef(aArg) RT_NOREF_PV(aArg)
263
264	/**
265	* Returns the const reference to the IID (i.e., \|const GUID &\|) of the given
266	* interface.
267	*
268	* @param I interface class
269	*/
270	#define COM_IIDOF(I) __uuidof(I)
271
272	/**
273	* For using interfaces before including the interface definitions. This will
274	* deal with XPCOM using 'class' and COM using 'struct' when defining
275	* interfaces.
276	*
277	* @param I interface name.
278	*/
279	#define COM_STRUCT_OR_CLASS(I) struct I
280
281	#else /* defined(RT_OS_WINDOWS) */
282
283	#error "VBOX_WITH_XPCOM must be defined on a platform other than Windows!"
284
285	#endif /* defined(RT_OS_WINDOWS) */
286
287	#else /* !defined(VBOX_WITH_XPCOM) */
288
289	// XPCOM
290	/////////////////////////////////////////////////////////////////////////////
291
292	#if defined(RT_OS_DARWIN) \|\| (defined(QT_VERSION) && (QT_VERSION >= 0x040000))
293	/* CFBase.h defines these &
294	* qglobal.h from Qt4 defines these */
295	# undef FALSE
296	# undef TRUE
297	#endif /* RT_OS_DARWIN \|\| QT_VERSION */
298
299	#include <nsID.h>
300
301	#define HRESULT nsresult
302	#define SUCCEEDED NS_SUCCEEDED
303	#define FAILED NS_FAILED
304
305	#define SUCCEEDED_WARNING(rc) (NS_SUCCEEDED(rc) && (rc) != NS_OK)
306
307	#define FAILED_DEAD_INTERFACE(rc) ( (rc) == NS_ERROR_ABORT \
308	\|\| (rc) == NS_ERROR_CALL_FAILED \
309	)
310
311	#define IUnknown nsISupports
312
313	#define BOOL PRBool
314	#define BYTE PRUint8
315	#define SHORT PRInt16
316	#define USHORT PRUint16
317	#define LONG PRInt32
318	#define ULONG PRUint32
319	#define LONG64 PRInt64
320	#define ULONG64 PRUint64
321	/* XPCOM has only 64bit floats */
322	#define FLOAT PRFloat64
323	#define DOUBLE PRFloat64
324
325	#define FALSE PR_FALSE
326	#define TRUE PR_TRUE
327
328	#define OLECHAR wchar_t
329
330	/* note: typedef to semantically match BSTR on Win32 */
331	typedef PRUnichar *BSTR;
332	typedef const PRUnichar *CBSTR;
333	typedef BSTR *LPBSTR;
334
335	/** Input BSTR argument the interface method declaration. */
336	#define IN_BSTR CBSTR
337
338	/**
339	* Type to define a raw GUID variable (for members use the com::Guid class
340	* instead).
341	*/
342	#define GUID nsID
343	/** Input GUID argument the interface method declaration. */
344	#define IN_GUID const nsID &
345	/** Output GUID argument the interface method declaration. */
346	#define OUT_GUID nsID **
347
348	/** Makes the name of the getter interface function (n must be capitalized). */
349	#define COMGETTER(n) Get##n
350	/** Makes the name of the setter interface function (n must be capitalized). */
351	#define COMSETTER(n) Set##n
352
353	/* safearray input parameter macros */
354	#define ComSafeArrayIn(aType, aArg) PRUint32 aArg##Size, aType *aArg
355	#define ComSafeArrayInIsNull(aArg) ((aArg) == NULL)
356	#define ComSafeArrayInArg(aArg) aArg##Size, aArg
357
358	/* safearray output parameter macros */
359	#define ComSafeArrayOut(aType, aArg) PRUint32 aArg##Size, aType *aArg
360	#define ComSafeArrayOutIsNull(aArg) ((aArg) == NULL)
361	#define ComSafeArrayOutArg(aArg) aArg##Size, aArg
362
363	/* safearray input parameter macros for GUID */
364	#define ComSafeGUIDArrayIn(aArg) PRUint32 aArg##Size, const nsID **aArg
365	#define ComSafeGUIDArrayInIsNull(aArg) ComSafeArrayInIsNull(aArg)
366	#define ComSafeGUIDArrayInArg(aArg) ComSafeArrayInArg(aArg)
367
368	/* safearray output parameter macros for GUID */
369	#define ComSafeGUIDArrayOut(aArg) PRUint32 aArg##Size, nsID **aArg
370	#define ComSafeGUIDArrayOutIsNull(aArg) ComSafeArrayOutIsNull(aArg)
371	#define ComSafeGUIDArrayOutArg(aArg) ComSafeArrayOutArg(aArg)
372
373	/** safearray size */
374	#define ComSafeArraySize(aArg) ((aArg) == NULL ? 0 : (aArg##Size))
375
376	/** NOREF a COM safe array argument. */
377	#define ComSafeArrayNoRef(aArg) RT_NOREF2(aArg, aArg##Size)
378
379	/* CLSID and IID for compatibility with Win32 */
380	typedef nsCID CLSID;
381	typedef nsIID IID;
382
383	/* OLE error codes */
384	#define S_OK ((nsresult)NS_OK)
385	#define S_FALSE ((nsresult)1)
386	#define E_UNEXPECTED NS_ERROR_UNEXPECTED
387	#define E_NOTIMPL NS_ERROR_NOT_IMPLEMENTED
388	#define E_OUTOFMEMORY NS_ERROR_OUT_OF_MEMORY
389	#define E_INVALIDARG NS_ERROR_INVALID_ARG
390	#define E_NOINTERFACE NS_ERROR_NO_INTERFACE
391	#define E_POINTER NS_ERROR_NULL_POINTER
392	#define E_ABORT NS_ERROR_ABORT
393	#define E_FAIL NS_ERROR_FAILURE
394	/* Note: a better analog for E_ACCESSDENIED would probably be
395	* NS_ERROR_NOT_AVAILABLE, but we want binary compatibility for now. */
396	#define E_ACCESSDENIED ((nsresult)0x80070005L)
397
398	#define STDMETHOD(a) NS_IMETHOD a
399	#define STDMETHODIMP NS_IMETHODIMP
400	#define STDMETHOD_(ret, meth) NS_IMETHOD_(ret) meth
401
402	#define COM_IIDOF(I) NS_GET_IID(I)
403
404	#define COM_STRUCT_OR_CLASS(I) class I
405
406	/* helper functions */
407	extern "C"
408	{
409	BSTR SysAllocString(const OLECHAR *sz);
410	BSTR SysAllocStringByteLen(char const *psz, unsigned int len);
411	BSTR SysAllocStringLen(const OLECHAR *pch, unsigned int cch);
412	void SysFreeString(BSTR bstr);
413	int SysReAllocString(BSTR pbstr, const OLECHAR psz);
414	int SysReAllocStringLen(BSTR pbstr, const OLECHAR psz, unsigned int cch);
415	unsigned int SysStringByteLen(BSTR bstr);
416	unsigned int SysStringLen(BSTR bstr);
417	}
418
419	#ifndef VBOX_COM_NO_ATL
420
421	namespace ATL
422	{
423
424	#define ATL_NO_VTABLE
425	#define DECLARE_CLASSFACTORY(a)
426	#define DECLARE_CLASSFACTORY_SINGLETON(a)
427	#define DECLARE_REGISTRY_RESOURCEID(a)
428	#define DECLARE_NOT_AGGREGATABLE(a)
429	#define DECLARE_PROTECT_FINAL_CONSTRUCT()
430	#define BEGIN_COM_MAP(a)
431	#define COM_INTERFACE_ENTRY(a)
432	#define COM_INTERFACE_ENTRY2(a,b)
433	#define END_COM_MAP() NS_DECL_ISUPPORTS
434	#define COM_INTERFACE_ENTRY_AGGREGATE(a,b)
435
436	/* A few very simple ATL emulator classes to provide
437	* FinalConstruct()/FinalRelease() functionality with XPCOM. */
438
439	class CComMultiThreadModel
440	{
441	};
442
443	template <class DummyThreadModel> class CComObjectRootEx
444	{
445	public:
446	HRESULT FinalConstruct()
447	{
448	return S_OK;
449	}
450	void FinalRelease()
451	{
452	}
453	};
454
455	template <class Base> class CComObject : public Base
456	{
457	public:
458	virtual ~CComObject() { this->FinalRelease(); }
459	};
460
461	} /* namespace ATL */
462
463
464	/**
465	* 'Constructor' for the component class.
466	* This constructor, as opposed to NS_GENERIC_FACTORY_CONSTRUCTOR,
467	* assumes that the component class is derived from the CComObjectRootEx<>
468	* template, so it calls FinalConstruct() right after object creation
469	* and ensures that FinalRelease() will be called right before destruction.
470	* The result from FinalConstruct() is returned to the caller.
471	*/
472	#define NS_GENERIC_FACTORY_CONSTRUCTOR_WITH_RC(_InstanceClass) \
473	static NS_IMETHODIMP \
474	_InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID, \
475	void **aResult) \
476	{ \
477	nsresult rv; \
478	\
479	*aResult = NULL; \
480	if (NULL != aOuter) { \
481	rv = NS_ERROR_NO_AGGREGATION; \
482	return rv; \
483	} \
484	\
485	ATL::CComObject<_InstanceClass> *inst = new ATL::CComObject<_InstanceClass>(); \
486	if (NULL == inst) { \
487	rv = NS_ERROR_OUT_OF_MEMORY; \
488	return rv; \
489	} \
490	\
491	NS_ADDREF(inst); /* protect FinalConstruct() */ \
492	rv = inst->FinalConstruct(); \
493	if (NS_SUCCEEDED(rv)) \
494	rv = inst->QueryInterface(aIID, aResult); \
495	NS_RELEASE(inst); \
496	\
497	return rv; \
498	}
499
500	/**
501	* 'Constructor' that uses an existing getter function that gets a singleton.
502	* The getter function must have the following prototype:
503	* nsresult _GetterProc(_InstanceClass **inst)
504	* This constructor, as opposed to NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR,
505	* lets the getter function return a result code that is passed back to the
506	* caller that tries to instantiate the object.
507	* NOTE: assumes that getter does an AddRef - so additional AddRef is not done.
508	*/
509	#define NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR_WITH_RC(_InstanceClass, _GetterProc) \
510	static NS_IMETHODIMP \
511	_InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID, \
512	void **aResult) \
513	{ \
514	nsresult rv; \
515	\
516	_InstanceClass inst = NULL; / initialized to shut up gcc */ \
517	\
518	*aResult = NULL; \
519	if (NULL != aOuter) { \
520	rv = NS_ERROR_NO_AGGREGATION; \
521	return rv; \
522	} \
523	\
524	rv = _GetterProc(&inst); \
525	if (NS_FAILED(rv)) \
526	return rv; \
527	\
528	/* sanity check */ \
529	if (NULL == inst) \
530	return NS_ERROR_OUT_OF_MEMORY; \
531	\
532	/* NS_ADDREF(inst); */ \
533	if (NS_SUCCEEDED(rv)) { \
534	rv = inst->QueryInterface(aIID, aResult); \
535	} \
536	NS_RELEASE(inst); \
537	\
538	return rv; \
539	}
540
541	#endif /* !VBOX_COM_NO_ATL */
542
543	#endif /* !defined(VBOX_WITH_XPCOM) */
544
545	/**
546	* Declares a wchar_t string literal from the argument.
547	* Necessary to overcome MSC / GCC differences.
548	* @param s expression to stringify
549	*/
550	#if defined(_MSC_VER)
551	# define WSTR_LITERAL(s) L#s
552	#elif defined(__GNUC__)
553	# define WSTR_LITERAL(s) L""#s
554	#else
555	# error "Unsupported compiler!"
556	#endif
557
558	namespace com
559	{
560
561	#ifndef VBOX_COM_NO_ATL
562
563	// use this macro to implement scriptable interfaces
564	#ifdef RT_OS_WINDOWS
565	#define VBOX_SCRIPTABLE_IMPL(iface) \
566	public ATL::IDispatchImpl<iface, &IID_##iface, &LIBID_VirtualBox, \
567	kTypeLibraryMajorVersion, kTypeLibraryMinorVersion>
568
569	#define VBOX_SCRIPTABLE_DISPATCH_IMPL(iface) \
570	STDMETHOD(QueryInterface)(REFIID riid, void **ppObj) \
571	{ \
572	if (riid == IID_##iface) \
573	{ \
574	ppObj = (iface )this; \
575	AddRef(); \
576	return S_OK; \
577	} \
578	if (riid == IID_IUnknown) \
579	{ \
580	ppObj = (IUnknown )this; \
581	AddRef(); \
582	return S_OK; \
583	} \
584	if (riid == IID_IDispatch) \
585	{ \
586	ppObj = (IDispatch )this; \
587	AddRef(); \
588	return S_OK; \
589	} \
590	*ppObj = NULL; \
591	return E_NOINTERFACE; \
592	}
593	#else
594	#define VBOX_SCRIPTABLE_IMPL(iface) \
595	public iface
596	#define VBOX_SCRIPTABLE_DISPATCH_IMPL(iface)
597	#endif
598
599	#endif /* !VBOX_COM_NO_ATL */
600
601	} /* namespace com */
602
603	/** @} */
604
605	#endif /* !VBOX_INCLUDED_com_defs_h */
606

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