compiler.hh revision 9419
1/* 2 * Copyright (c) 2012 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2006 The Regents of The University of Michigan 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Ali Saidi 41 */ 42 43#ifndef __BASE_COMPILER_HH__ 44#define __BASE_COMPILER_HH__ 45 46#include "config/have_static_assert.hh" 47 48// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html 49 50#if defined(__GNUC__) 51#define M5_ATTR_NORETURN __attribute__((noreturn)) 52#define M5_PRAGMA_NORETURN(x) 53#define M5_DUMMY_RETURN 54#define M5_VAR_USED __attribute__((unused)) 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