4544f3def4
C++11 has support for static_asserts to provide compile-time assertion checking. This is very useful when testing, for example, structure sizes to make sure that the compiler got the right alignment or vector sizes.
90 lines
3.7 KiB
C++
90 lines
3.7 KiB
C++
/*
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* Copyright (c) 2006 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Ali Saidi
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*/
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#ifndef __BASE_COMPILER_HH__
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#define __BASE_COMPILER_HH__
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#include "config/have_static_assert.hh"
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//http://msdn2.microsoft.com/en-us/library/ms937669.aspx
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//http://msdn2.microsoft.com/en-us/library/aa448724.aspx
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//http://docs.sun.com/source/819-3688/sun.specific.html#marker-998278
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//http://gcc.gnu.org/onlinedocs/gcc-3.3.1/gcc/Function-Attributes.html#Function%20Attributes
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#if defined(__GNUC__)
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#define M5_ATTR_NORETURN __attribute__((noreturn))
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#define M5_PRAGMA_NORETURN(x)
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#define M5_DUMMY_RETURN
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#define M5_VAR_USED __attribute__((unused))
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#define M5_ATTR_PACKED __attribute__ ((__packed__))
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#define M5_NO_INLINE __attribute__ ((__noinline__))
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#elif defined(__SUNPRO_CC)
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// this doesn't do anything with sun cc, but why not
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#define M5_ATTR_NORETURN __sun_attr__((__noreturn__))
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#define M5_DUMMY_RETURN return (0);
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#define DO_PRAGMA(x) _Pragma(#x)
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#define M5_VAR_USED
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#define M5_PRAGMA_NORETURN(x) DO_PRAGMA(does_not_return(x))
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#define M5_ATTR_PACKED __attribute__ ((__packed__))
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#define M5_NO_INLINE __attribute__ ((__noinline__))
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#else
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#error "Need to define compiler options in base/compiler.hh"
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#endif
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/*
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* Define a compatibility macro that emulates the behavior of
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* static_assert using template magic if the compiler doesn't have
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* native support.
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*/
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#if !HAVE_STATIC_ASSERT
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template<bool>
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struct static_assert_failure;
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template<>
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struct static_assert_failure<false> {};
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/* The following macro causes the compiler to evaluate the size of the
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* static_assert_failure struct. The templates are designed so that
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* only static_assert_failure<false> evaluates to a proper size, while
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* static_assert_failure<true> generates a compile time error.
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*/
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#define static_assert(expr, msg) \
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namespace ns_static_assert { \
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enum { \
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static_assert_ ## __LINE__ = \
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sizeof(static_assert_failure<!(expr)>) \
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}; \
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}
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#endif
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#endif // __BASE_COMPILER_HH__
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