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77 lines
2.9 KiB
C
77 lines
2.9 KiB
C
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/** @file
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* @brief Compiler attribute macros
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*/
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// Copyright (C) 2012,2013,2014,2015 Olly Betts
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program 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
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#ifndef XAPIAN_INCLUDED_ATTRIBUTES_H
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#define XAPIAN_INCLUDED_ATTRIBUTES_H
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#if __cplusplus >= 201103L || (defined _MSC_VER && _MSC_VER >= 1900)
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// C++11 has noexcept for marking a function which shouldn't throw.
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//
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// You need a C++11 compiler to build Xapian, but we still support using a
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// non-C++11 compiler to build code which uses Xapian (one reason is that
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// currently you need an option to enable C++11 support for most
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// compilers). Once we require C++11 for using Xapian, XAPIAN_NOTHROW can go
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// away.
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//
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// We can't simply just add noexcept via XAPIAN_NOTHROW as noexcept has
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// to be added to all declarations, whereas the GCC attribute can't be used on
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// a function definition. So for now, XAPIAN_NOTHROW() goes around
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// declarations, and XAPIAN_NOEXCEPT needs to be explicitly added to
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// definitions.
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# define XAPIAN_NOEXCEPT noexcept
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#else
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# define XAPIAN_NOEXCEPT
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#endif
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#ifdef __GNUC__
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// __attribute__((__const__)) is available at least as far back as GCC 2.95.
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# define XAPIAN_CONST_FUNCTION __attribute__((__const__))
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// __attribute__((__pure__)) is available from GCC 2.96 onwards.
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# define XAPIAN_PURE_FUNCTION __attribute__((__pure__))
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// __attribute__((__nothrow__)) is available from GCC 3.3 onwards.
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# if __GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)
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# define XAPIAN_NOTHROW(D) D XAPIAN_NOEXCEPT __attribute__((__nothrow__))
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# endif
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#else
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/** A function which does not examine any values except its arguments and has
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* no effects except its return value.
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*
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* This means the compiler can perform CSE (common subexpression elimination)
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* on calls to such a function with the same arguments, and also completely
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* eliminate calls to this function when the return value isn't used.
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*/
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# define XAPIAN_CONST_FUNCTION
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/** Like XAPIAN_CONST_FUNCTION, but such a function can also examine global
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* memory, perhaps via pointer or reference parameters.
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*/
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# define XAPIAN_PURE_FUNCTION
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#endif
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#ifndef XAPIAN_NOTHROW
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/** A function or method which will never throw an exception. */
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# define XAPIAN_NOTHROW(D) D XAPIAN_NOEXCEPT
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#endif
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#endif // XAPIAN_INCLUDED_ATTRIBUTES_H
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