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/* This file is part of the KDE libraries
Copyright (c) 2002-2003 KDE Team
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef _KDE_MACROS_H_
#define _KDE_MACROS_H_
/* Set by configure */
#undef __KDE_HAVE_GCC_VISIBILITY
/**
* The KDE_NO_EXPORT macro marks the symbol of the given variable
* to be hidden. A hidden symbol is stripped during the linking step,
* so it can't be used from outside the resulting library, which is similar
* to static. However, static limits the visibility to the current
* compilation unit. hidden symbols can still be used in multiple compilation
* units.
*
* \code
* int KDE_NO_EXPORT foo;
* int KDE_EXPORT bar;
* \end
*/
#ifdef __KDE_HAVE_GCC_VISIBILITY
#define KDE_NO_EXPORT __attribute__ ((visibility("hidden")))
#define KDE_EXPORT __attribute__ ((visibility("default")))
#elif defined(Q_WS_WIN)
#define KDE_NO_EXPORT
#define KDE_EXPORT __declspec(dllexport)
#else
#define KDE_NO_EXPORT
#define KDE_EXPORT
#endif
/**
* KDE_Q_EXPORT_PLUGIN is a workaround for Qt not being able to
* cope with symbol visibility.
*/
#define KDE_Q_EXPORT_PLUGIN(PLUGIN) \
Q_EXTERN_C KDE_EXPORT const char* qt_ucm_query_verification_data(); \
Q_EXTERN_C KDE_EXPORT QUnknownInterface* ucm_instantiate(); \
Q_EXPORT_PLUGIN(PLUGIN)
/**
* The KDE_PACKED can be used to hint the compiler that a particular
* structure or class should not contain unnecessary paddings.
*/
#ifdef __GNUC__
#define KDE_PACKED __attribute__((__packed__))
#else
#define KDE_PACKED
#endif
/**
* The KDE_DEPRECATED macro can be used to trigger compile-time warnings
* with newer compilers when deprecated functions are used.
*
* For non-inline functions, the macro gets inserted at the very end of the
* function declaration, right before the semicolon:
*
* \code
* DeprecatedConstructor() KDE_DEPRECATED;
* void deprecatedFunctionA() KDE_DEPRECATED;
* int deprecatedFunctionB() const KDE_DEPRECATED;
* \endcode
*
* Functions which are implemented inline are handled differently: for them,
* the KDE_DEPRECATED macro is inserted at the front, right before the return
* type, but after "static" or "virtual":
*
* \code
* KDE_DEPRECATED void deprecatedInlineFunctionA() { .. }
* virtual KDE_DEPRECATED int deprecatedInlineFunctionB() { .. }
* static KDE_DEPRECATED bool deprecatedInlineFunctionC() { .. }
* \end
*
* You can also mark whole structs or classes as deprecated, by inserting the
* KDE_DEPRECATED macro after the struct/class keyword, but before the
* name of the struct/class:
*
* \code
* class KDE_DEPRECATED DeprecatedClass { };
* struct KDE_DEPRECATED DeprecatedStruct { };
* \endcode
*
* \note
* It does not make much sense to use the KDE_DEPRECATED keyword for a Qt signal;
* this is because usually get called by the class which they belong to,
* and one'd assume that a class author doesn't use deprecated methods of his
* own class. The only exception to this are signals which are connected to
* other signals; they get invoked from moc-generated code. In any case,
* printing a warning message in either case is not useful.
* For slots, it can make sense (since slots can be invoked directly) but be
* aware that if the slots get triggered by a signal, the will get called from
* moc code as well and thus the warnings are useless.
*
* \par
* Also note that it is not possible to use KDE_DEPRECATED for classes which
* use the k_dcop keyword (to indicate a DCOP interface declaration); this is
* because the dcopidl program would choke on the unexpected declaration
* syntax.
*/
#ifndef KDE_DEPRECATED
#if __GNUC__ - 0 > 3 || (__GNUC__ - 0 == 3 && __GNUC_MINOR__ - 0 >= 2)
/* gcc >= 3.2 */
# define KDE_DEPRECATED __attribute__ ((deprecated))
#elif defined(_MSC_VER) && (_MSC_VER >= 1300)
/* msvc >= 7 */
# define KDE_DEPRECATED __declspec(deprecated)
#else
# define KDE_DEPRECATED
#endif
#endif
/**
* The KDE_ISLIKELY macro tags a boolean expression as likely to evaluate to
* 'true'. When used in an if ( ) statement, it gives a hint to the compiler
* that the following codeblock is likely to get executed. Providing this
* information helps the compiler to optimize the code for better performance.
* Using the macro has an insignificant code size or runtime memory footprint impact.
* The code semantics is not affected.
*
* \note
* Providing wrong information ( like marking a condition that almost never
* passes as 'likely' ) will cause a significant runtime slowdown. Therefore only
* use it for cases where you can be sure about the odds of the expression to pass
* in all cases ( independent from e.g. user configuration ).
*
* \par
* The KDE_ISUNLIKELY macro tags an expression as unlikely evaluating to 'true'.
*
* \note
* Do NOT use ( !KDE_ISLIKELY(foo) ) as an replacement for KDE_ISUNLIKELY !
*
* \code
* if ( KDE_ISUNLIKELY( testsomething() ) )
* abort(); // assume its unlikely that the application aborts
* \endcode
*/
#if __GNUC__ - 0 >= 3
# define KDE_ISLIKELY( x ) __builtin_expect(!!(x),1)
# define KDE_ISUNLIKELY( x ) __builtin_expect(!!(x),0)
#else
# define KDE_ISLIKELY( x ) ( x )
# define KDE_ISUNLIKELY( x ) ( x )
#endif
/**
* This macro, and it's friends going up to 10 reserve a fixed number of virtual
* functions in a class. Because adding virtual functions to a class changes the
* size of the vtable, adding virtual functions to a class breaks binary
* compatibility. However, by using this macro, and decrementing it as new
* virtual methods are added, binary compatibility can still be preserved.
*
* \note The added functions must be added to the header at the same location
* as the macro; changing the order of virtual functions in a header is also
* binary incompatible as it breaks the layout of the vtable.
*/
#define RESERVE_VIRTUAL_1 \
virtual void reservedVirtual1() {}
#define RESERVE_VIRTUAL_2 \
virtual void reservedVirtual2() {} \
RESERVE_VIRTUAL_1
#define RESERVE_VIRTUAL_3 \
virtual void reservedVirtual3() {} \
RESERVE_VIRTUAL_2
#define RESERVE_VIRTUAL_4 \
virtual void reservedVirtual4() {} \
RESERVE_VIRTUAL_3
#define RESERVE_VIRTUAL_5 \
virtual void reservedVirtual5() {} \
RESERVE_VIRTUAL_4
#define RESERVE_VIRTUAL_6 \
virtual void reservedVirtual6() {} \
RESERVE_VIRTUAL_5
#define RESERVE_VIRTUAL_7 \
virtual void reservedVirtual7() {} \
RESERVE_VIRTUAL_6
#define RESERVE_VIRTUAL_8 \
virtual void reservedVirtual8() {} \
RESERVE_VIRTUAL_7
#define RESERVE_VIRTUAL_9 \
virtual void reservedVirtual9() {} \
RESERVE_VIRTUAL_8
#define RESERVE_VIRTUAL_10 \
virtual void reservedVirtual10() {} \
RESERVE_VIRTUAL_9
#endif /* _KDE_MACROS_H_ */
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