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elfcpp:/

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* elfcpp_swap.h: #include "config.h".  Only #include <byteswap.h>
	if HAVE_BYTESWAP_H is defined; if not, provide definitions for
	bswap_{16,32,64}.  For gcc 4.3 and later, use the builtin bswap
	functions.  Check WORDS_BIGENDIAN rather than __BYTE_ORDER.
gold:/
	* configure.ac: Check for byteswap.h.
	* configure: Rebuild.
	* config.in: Rebuild.
This commit is contained in:
Ian Lance Taylor 2009-03-02 02:45:29 +00:00
parent 3c54f1401b
commit 15d5fa1607
6 changed files with 222 additions and 3 deletions
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58
elfcpp/elfcpp_swap.h
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@ -1,6 +1,6 @@
// elfcpp_swap.h -- Handle swapping for elfcpp -*- C++ -*-
// Copyright 2006, 2007, Free Software Foundation, Inc.
// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of elfcpp.
@ -37,8 +37,54 @@
#define ELFCPP_SWAP_H
#include <stdint.h>
#include <endian.h>
// We need an autoconf-generated config.h file for endianness and
// swapping. We check two macros: WORDS_BIGENDIAN and
// HAVE_BYTESWAP_H.
#include "config.h"
#ifdef HAVE_BYTESWAP_H
#include <byteswap.h>
#else
// Provide our own versions of the byteswap functions.
inline uint16_t
bswap_16(uint16_t v)
{
return ((v >> 8) & 0xff) | ((v & 0xff) << 8);
}
inline uint32_t
bswap_32(uint32_t v)
{
return ( ((v & 0xff000000) >> 24)
| ((v & 0x00ff0000) >> 8)
| ((v & 0x0000ff00) << 8)
| ((v & 0x000000ff) << 24));
}
inline uint64_t
bswap_64(uint64_t v)
{
return ( ((v & 0xff00000000000000ULL) >> 56)
| ((v & 0x00ff000000000000ULL) >> 40)
| ((v & 0x0000ff0000000000ULL) >> 24)
| ((v & 0x000000ff00000000ULL) >> 8)
| ((v & 0x00000000ff000000ULL) << 8)
| ((v & 0x0000000000ff0000ULL) << 24)
| ((v & 0x000000000000ff00ULL) << 40)
| ((v & 0x00000000000000ffULL) << 56));
}
#endif // !defined(HAVE_BYTESWAP_H)
// gcc 4.3 and later provides __builtin_bswap32 and __builtin_bswap64.
#if defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
#undef bswap_32
#define bswap_32 __builtin_bswap32
#undef bswap_64
#define bswap_64 __builtin_bswap64
#endif
namespace elfcpp
{
@ -49,7 +95,13 @@ struct Endian
{
public:
// Used for template specializations.
static const bool host_big_endian = __BYTE_ORDER == __BIG_ENDIAN;
static const bool host_big_endian =
#ifdef WORDS_BIGENDIAN
true
#else
false
#endif
;
};
// Valtype_base is a template based on size (8, 16, 32, 64) which