compiler.hh revision 9255:60f043573a65 
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