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nasm/include/compiler.h
H. Peter Anvin 0a126062fb ilog2(): inline functions if practical 
For many (most?) targets these will be very small functions, so inline
them.  However, just in case make these external library functions.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2017-09-27 13:34:42 -07:00

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/* ----------------------------------------------------------------------- *
*
* Copyright 2007-2017 The NASM Authors - All Rights Reserved
* See the file AUTHORS included with the NASM distribution for
* the specific copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ----------------------------------------------------------------------- */
/*
* compiler.h
*
* Compiler-specific macros for NASM. Feel free to add support for
* other compilers in here.
*
* This header file should be included before any other header.
*/
#ifndef NASM_COMPILER_H
#define NASM_COMPILER_H 1
/*
* At least DJGPP and Cygwin have broken header files if __STRICT_ANSI__
* is defined.
*/
#ifdef __GNUC__
# undef __STRICT_ANSI__
#endif
/* On Microsoft platforms we support multibyte character sets in filenames */
#define _MBCS 1
#ifdef HAVE_CONFIG_H
# include "config/config.h"
#elif defined(_MSC_VER) && (_MSC_VER >= 1310)
# include "config/msvc.h"
#elif defined(__WATCOMC__)
# include "config/watcom.h"
#else
# include "config/unknown.h"
#endif /* Configuration file */
/* This is required to get the standard <inttypes.h> macros when compiling
with a C++ compiler. This must be defined *before* <inttypes.h> is
included, directly or indirectly. */
#define __STDC_CONSTANT_MACROS 1
#define __STDC_LIMIT_MACROS 1
#define __STDC_FORMAT_MACROS 1
#ifdef HAVE_INTTYPES_H
# include <inttypes.h>
#else
# include "nasmint.h"
#endif
#include <assert.h>
#include <stddef.h>
#include <stdarg.h>
#include <stdio.h>
#include <limits.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_ENDIAN_H
# include <endian.h>
#elif defined(HAVE_SYS_ENDIAN_H)
# include <sys/endian.h>
#elif defined(HAVE_MACHINE_ENDIAN_H)
# include <machine/endian.h>
#endif
/*
* If we have BYTE_ORDER defined, or the compiler provides
* __BIG_ENDIAN__ or __LITTLE_ENDIAN__, trust it over what autoconf
* came up with, especially since autoconf obviously can't figure
* things out for a universal compiler.
*/
#if defined(__BIG_ENDIAN__) && !defined(__LITTLE_ENDIAN__)
# undef WORDS_LITTLEENDIAN
# undef WORDS_BIGENDIAN
# define WORDS_BIGENDIAN 1
#elif defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__)
# undef WORDS_LITTLEENDIAN
# undef WORDS_BIGENDIAN
# define WORDS_LITTLEENDIAN 1
#elif defined(BYTE_ORDER) && defined(LITTLE_ENDIAN) && defined(BIG_ENDIAN)
# undef WORDS_LITTLEENDIAN
# undef WORDS_BIGENDIAN
# if BYTE_ORDER == LITTLE_ENDIAN
# define WORDS_LITTLEENDIAN 1
# elif BYTE_ORDER == BIG_ENDIAN
# define WORDS_BIGENDIAN 1
# endif
#endif
/*
* Define this to 1 for faster performance if this is a littleendian
* platform *and* it can do arbitrary unaligned memory references. It
* is safe to leave it defined to 0 even if that is true.
*/
#if defined(__386__) || defined(__i386__) || defined(__x86_64__) \
|| defined(_M_IX86) || defined(_M_X64)
# define X86_MEMORY 1
# undef WORDS_BIGENDIAN
# undef WORDS_LITTLEENDIAN
# define WORDS_LITTLEENDIAN 1
#else
# define X86_MEMORY 0
#endif
/* Some versions of MSVC have these only with underscores in front */
#ifndef HAVE_SNPRINTF
# ifdef HAVE__SNPRINTF
# define snprintf _snprintf
# else
int snprintf(char *, size_t, const char *, ...);
# endif
#endif
#ifndef HAVE_VSNPRINTF
# ifdef HAVE__VSNPRINTF
# define vsnprintf _vsnprintf
# else
int vsnprintf(char *, size_t, const char *, va_list);
# endif
#endif
#if !defined(HAVE_STRLCPY) || !HAVE_DECL_STRLCPY
size_t strlcpy(char *, const char *, size_t);
#endif
#ifndef __cplusplus /* C++ has false, true, bool as keywords */
# ifdef HAVE_STDBOOL_H
# include <stdbool.h>
# elif defined(HAVE__BOOL)
# typedef _Bool bool
# define false 0
# define true 1
# else
/* This is sort of dangerous, since casts will behave different than
casting to the standard boolean type. Always use !!, not (bool). */
typedef enum bool { false, true } bool;
# endif
#endif
/* Provide a substitute for offsetof() if we don't have one. This
variant works on most (but not *all*) systems... */
#ifndef offsetof
# define offsetof(t,m) ((size_t)&(((t *)0)->m))
#endif
/* The container_of construct: if p is a pointer to member m of
container class c, then return a pointer to the container of which
*p is a member. */
#ifndef container_of
# define container_of(p, c, m) ((c *)((char *)(p) - offsetof(c,m)))
#endif
/* Some misguided platforms hide the defs for these */
#if defined(HAVE_STRCASECMP) && !HAVE_DECL_STRCASECMP
int strcasecmp(const char *, const char *);
#endif
#if defined(HAVE_STRICMP) && !HAVE_DECL_STRICMP
int stricmp(const char *, const char *);
#endif
#if defined(HAVE_STRNCASECMP) && !HAVE_DECL_STRNCASECMP
int strncasecmp(const char *, const char *, size_t);
#endif
#if defined(HAVE_STRNICMP) && !HAVE_DECL_STRNICMP
int strnicmp(const char *, const char *, size_t);
#endif
#if defined(HAVE_STRSEP) && !HAVE_DECL_STRSEP
char *strsep(char **, const char *);
#endif
#if !HAVE_DECL_STRNLEN
size_t strnlen(const char *s, size_t maxlen);
#endif
/*
* Hack to support external-linkage inline functions
*/
#ifdef __GNUC__
# ifdef __GNUC_STDC_INLINE__
# define HAVE_STDC_INLINE
# else
# define HAVE_GNU_INLINE
# endif
#elif defined(__STDC_VERSION__)
# if __STDC_VERSION__ >= 199901L
# define HAVE_STDC_INLINE
# endif
#endif
#ifdef HAVE_STDC_INLINE
# define extern_inline inline
#elif defined(HAVE_GNU_INLINE)
# define extern_inline extern inline
#else
# define inline_prototypes
#endif
/*
* Hints to the compiler that a particular branch of code is more or
* less likely to be taken.
*/
#if HAVE___BUILTIN_EXPECT
# define likely(x) __builtin_expect(!!(x), 1)
# define unlikely(x) __builtin_expect(!!(x), 0)
#else
# define likely(x) (!!(x))
# define unlikely(x) (!!(x))
#endif
/*
* Hints about malloc-like functions that never return NULL
*/
#ifdef HAVE_FUNC_ATTRIBUTE_RETURNS_NONNULL
# define never_null __attribute__((returns_nonnull))
#else
# define never_null
#endif
#ifdef HAVE_FUNC_ATTRIBUTE_MALLOC
# define safe_alloc never_null __attribute__((malloc))
#else
# define safe_alloc
#endif
#ifdef HAVE_FUNC_ATTRIBUTE_ALLOC_SIZE
# define safe_malloc(s) safe_alloc __attribute__((alloc_size(s)))
# define safe_malloc2(s1,s2) safe_alloc __attribute__((alloc_size(s1,s2)))
# define safe_realloc(s) never_null __attribute__((alloc_size(s)))
#else
# define safe_malloc(s) safe_alloc
# define safe_malloc2(s1,s2) safe_alloc
# define safe_realloc(s) never_null
#endif
/*
* How to tell the compiler that a function doesn't return
*/
#ifdef HAVE_STDNORETURN_H
# include <stdnoreturn.h>
# define no_return noreturn void
#elif defined(HAVE_FUNC_ATTRIBUTE_NORETURN)
# define no_return void __attribute__((noreturn))
#elif defined(_MSC_VER)
# define no_return __declspec(noreturn) void
#else
# define no_return void
#endif
/*
* How to tell the compiler that a function takes a printf-like string
*/
#ifdef HAVE_FUNC_ATTRIBUTE_FORMAT
# define printf_func(fmt, list) __attribute__((format(printf, fmt, list)))
#else
# define printf_func(fmt, list)
#endif
/*
* How to tell the compiler that a function is pure arithmetic
*/
#ifdef HAVE_FUNC_ATTRIBUTE_CONST
# define const_func __attribute__((const))
#else
# define const_func
#endif
/*
* This function has no side effects, but depends on its arguments,
* memory pointed to by its arguments, or global variables.
* NOTE: functions that return a value by modifying memory pointed to
* by a pointer argument are *NOT* considered pure.
*/
#ifdef HAVE_FUNC_ATTRIBUTE_PURE
# define pure_func __attribute__((pure))
#else
# define pure_func
#endif
/* Watcom doesn't handle switch statements with 64-bit types, hack around it */
#ifdef __WATCOMC__
# define BOGUS_CASE 0x76543210
static inline unsigned int watcom_switch_hack(uint64_t x)
{
if (x > (uint64_t)UINT_MAX)
return BOGUS_CASE;
else
return (unsigned int)x;
}
# define switch(x) switch(sizeof(x) > sizeof(unsigned int) \
? watcom_switch_hack(x) : (unsigned int)(x))
/* This is to make sure BOGUS_CASE doesn't conflict with anything real... */
# define default case BOGUS_CASE: default
#endif
#endif /* NASM_COMPILER_H */
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