1/**************************************************************************
2 *
3 * Copyright 2007-2013 VMware, Inc.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28#include "no_extern_c.h"
29
30#ifndef _C99_COMPAT_H_
31#define _C99_COMPAT_H_
32
33
34/*
35 * MSVC hacks.
36 */
37#if defined(_MSC_VER)
38
39#  if _MSC_VER < 1900
40#    error "Microsoft Visual Studio 2015 or higher required"
41#  endif
42
43   /*
44    * Visual Studio will complain if we define the `inline` keyword, but
45    * actually it only supports the keyword on C++.
46    *
47    * To avoid this the _ALLOW_KEYWORD_MACROS must be set.
48    */
49#  if !defined(_ALLOW_KEYWORD_MACROS)
50#    define _ALLOW_KEYWORD_MACROS
51#  endif
52
53   /*
54    * XXX: MSVC has a `__restrict` keyword, but it also has a
55    * `__declspec(restrict)` modifier, so it is impossible to define a
56    * `restrict` macro without interfering with the latter.  Furthermore the
57    * MSVC standard library uses __declspec(restrict) under the _CRTRESTRICT
58    * macro.  For now resolve this issue by redefining _CRTRESTRICT, but going
59    * forward we should probably should stop using restrict, especially
60    * considering that our code does not obbey strict aliasing rules any way.
61    */
62#  include <crtdefs.h>
63#  undef _CRTRESTRICT
64#  define _CRTRESTRICT
65#endif
66
67
68/*
69 * C99 inline keyword
70 */
71#ifndef inline
72#  ifdef __cplusplus
73     /* C++ supports inline keyword */
74#  elif defined(__GNUC__)
75#    define inline __inline__
76#  elif defined(_MSC_VER)
77#    define inline __inline
78#  elif defined(__ICL)
79#    define inline __inline
80#  elif defined(__INTEL_COMPILER)
81     /* Intel compiler supports inline keyword */
82#  elif defined(__WATCOMC__) && (__WATCOMC__ >= 1100)
83#    define inline __inline
84#  elif (__STDC_VERSION__ >= 199901L)
85     /* C99 supports inline keyword */
86#  else
87#    define inline
88#  endif
89#endif
90
91
92/*
93 * C99 restrict keyword
94 *
95 * See also:
96 * - http://cellperformance.beyond3d.com/articles/2006/05/demystifying-the-restrict-keyword.html
97 */
98#ifndef restrict
99#  if (__STDC_VERSION__ >= 199901L)
100     /* C99 */
101#  elif defined(__GNUC__)
102#    define restrict __restrict__
103#  elif defined(_MSC_VER)
104#    define restrict __restrict
105#  else
106#    define restrict /* */
107#  endif
108#endif
109
110
111/*
112 * C99 __func__ macro
113 */
114#ifndef __func__
115#  if (__STDC_VERSION__ >= 199901L)
116     /* C99 */
117#  elif defined(__GNUC__)
118#    define __func__ __FUNCTION__
119#  elif defined(_MSC_VER)
120#    define __func__ __FUNCTION__
121#  else
122#    define __func__ "<unknown>"
123#  endif
124#endif
125
126
127/* Simple test case for debugging */
128#if 0
129static inline const char *
130test_c99_compat_h(const void * restrict a,
131                  const void * restrict b)
132{
133   return __func__;
134}
135#endif
136
137
138/* Fallback definitions, for build systems other than autoconfig which don't
139 * auto-detect these things. */
140#ifdef HAVE_NO_AUTOCONF
141
142#  ifndef _WIN32
143#    define HAVE_PTHREAD
144#    define HAVE_POSIX_MEMALIGN
145#  endif
146
147#  ifdef __GNUC__
148#    if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 2)
149#      error "GCC version 4.2 or higher required"
150#    endif
151
152     /* https://gcc.gnu.org/onlinedocs/gcc-4.2.4/gcc/Other-Builtins.html */
153#    define HAVE___BUILTIN_CLZ 1
154#    define HAVE___BUILTIN_CLZLL 1
155#    define HAVE___BUILTIN_CTZ 1
156#    define HAVE___BUILTIN_EXPECT 1
157#    define HAVE___BUILTIN_FFS 1
158#    define HAVE___BUILTIN_FFSLL 1
159#    define HAVE___BUILTIN_POPCOUNT 1
160#    define HAVE___BUILTIN_POPCOUNTLL 1
161     /* https://gcc.gnu.org/onlinedocs/gcc-4.2.4/gcc/Function-Attributes.html */
162#    define HAVE_FUNC_ATTRIBUTE_FLATTEN 1
163#    define HAVE_FUNC_ATTRIBUTE_UNUSED 1
164#    define HAVE_FUNC_ATTRIBUTE_FORMAT 1
165#    define HAVE_FUNC_ATTRIBUTE_PACKED 1
166#    define HAVE_FUNC_ATTRIBUTE_ALIAS 1
167#    define HAVE_FUNC_ATTRIBUTE_NORETURN 1
168
169#    if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
170       /* https://gcc.gnu.org/onlinedocs/gcc-4.3.6/gcc/Other-Builtins.html */
171#      define HAVE___BUILTIN_BSWAP32 1
172#      define HAVE___BUILTIN_BSWAP64 1
173#    endif
174
175#    if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
176#      define HAVE___BUILTIN_UNREACHABLE 1
177#    endif
178
179#  endif /* __GNUC__ */
180
181#endif /* !HAVE_AUTOCONF */
182
183
184#endif /* _C99_COMPAT_H_ */
185