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