compiler.hh revision 9419:54d5c0e5852a 
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