compiler.hh revision 9255
1/* 2 * Copyright (c) 2006 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Ali Saidi 29 */ 30 31#ifndef __BASE_COMPILER_HH__ 32#define __BASE_COMPILER_HH__ 33 34#include "config/have_static_assert.hh" 35 36//http://msdn2.microsoft.com/en-us/library/ms937669.aspx 37//http://msdn2.microsoft.com/en-us/library/aa448724.aspx 38//http://docs.sun.com/source/819-3688/sun.specific.html#marker-998278 39//http://gcc.gnu.org/onlinedocs/gcc-3.3.1/gcc/Function-Attributes.html#Function%20Attributes 40 41#if defined(__GNUC__) 42#define M5_ATTR_NORETURN __attribute__((noreturn)) 43#define M5_PRAGMA_NORETURN(x) 44#define M5_DUMMY_RETURN 45#define M5_VAR_USED __attribute__((unused)) 46#define M5_ATTR_PACKED __attribute__ ((__packed__)) 47#define M5_NO_INLINE __attribute__ ((__noinline__)) 48#elif defined(__SUNPRO_CC) 49// this doesn't do anything with sun cc, but why not 50#define M5_ATTR_NORETURN __sun_attr__((__noreturn__)) 51#define M5_DUMMY_RETURN return (0); 52#define DO_PRAGMA(x) _Pragma(#x) 53#define M5_VAR_USED 54#define M5_PRAGMA_NORETURN(x) DO_PRAGMA(does_not_return(x)) 55#define M5_ATTR_PACKED __attribute__ ((__packed__)) 56#define M5_NO_INLINE __attribute__ ((__noinline__)) 57#else 58#error "Need to define compiler options in base/compiler.hh" 59#endif 60 61/* 62 * Define a compatibility macro that emulates the behavior of 63 * static_assert using template magic if the compiler doesn't have 64 * native support. 65 */ 66#if !HAVE_STATIC_ASSERT 67 68template<bool> 69struct static_assert_failure; 70 71template<> 72struct static_assert_failure<false> {}; 73 74/* The following macro causes the compiler to evaluate the size of the 75 * static_assert_failure struct. The templates are designed so that 76 * only static_assert_failure<false> evaluates to a proper size, while 77 * static_assert_failure<true> generates a compile time error. 78 */ 79#define static_assert(expr, msg) \ 80 namespace ns_static_assert { \ 81 enum { \ 82 static_assert_ ## __LINE__ = \ 83 sizeof(static_assert_failure<!(expr)>) \ 84 }; \ 85 } 86 87#endif 88 89#endif // __BASE_COMPILER_HH__ 90