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Rework swapping code.

This commit is contained in:
Ian Lance Taylor 2006-11-06 22:45:08 +00:00
parent 000ef4f0ec
commit 8d9455b422
3 changed files with 426 additions and 252 deletions
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169
elfcpp/elfcpp.h
View File

@ -6,6 +6,7 @@
#define ELFCPP_H
#include "elfcpp_config.h"
#include "elfcpp_swap.h"
#include <stdint.h>
@ -559,24 +560,6 @@ struct Elf_sizes
static const int rela_size = sizeof(internal::Rela_data<size>);
};
// Given the address of an Elf_Word, return the value.
template<bool big_endian>
inline Elf_Word
read_elf_word(const Elf_Word* p)
{
return internal::convert_word<big_endian>(*p);
}
// Store an Elf_Word into an address.
template<bool big_endian>
inline void
write_elf_word(Elf_Word* p, Elf_Word v)
{
*p = internal::convert_word<big_endian>(v);
}
// Accessor class for the ELF file header.
template<int size, bool big_endian>
@ -593,55 +576,55 @@ class Ehdr
Elf_Half
get_e_type() const
{ return internal::convert_half<big_endian>(this->p_->e_type); }
{ return Convert<16, big_endian>::convert_host(this->p_->e_type); }
Elf_Half
get_e_machine() const
{ return internal::convert_half<big_endian>(this->p_->e_machine); }
{ return Convert<16, big_endian>::convert_host(this->p_->e_machine); }
Elf_Word
get_e_version() const
{ return internal::convert_word<big_endian>(this->p_->e_version); }
{ return Convert<32, big_endian>::convert_host(this->p_->e_version); }
typename Elf_types<size>::Elf_Addr
get_e_entry() const
{ return internal::convert_addr<size, big_endian>(this->p_->e_entry); }
{ return Convert<size, big_endian>::convert_host(this->p_->e_entry); }
typename Elf_types<size>::Elf_Off
get_e_phoff() const
{ return internal::convert_off<size, big_endian>(this->p_->e_phoff); }
{ return Convert<size, big_endian>::convert_host(this->p_->e_phoff); }
typename Elf_types<size>::Elf_Off
get_e_shoff() const
{ return internal::convert_off<size, big_endian>(this->p_->e_shoff); }
{ return Convert<size, big_endian>::convert_host(this->p_->e_shoff); }
Elf_Word
get_e_flags() const
{ return internal::convert_word<big_endian>(this->p_->e_flags); }
{ return Convert<32, big_endian>::convert_host(this->p_->e_flags); }
Elf_Half
get_e_ehsize() const
{ return internal::convert_half<big_endian>(this->p_->e_ehsize); }
{ return Convert<16, big_endian>::convert_host(this->p_->e_ehsize); }
Elf_Half
get_e_phentsize() const
{ return internal::convert_half<big_endian>(this->p_->e_phentsize); }
{ return Convert<16, big_endian>::convert_host(this->p_->e_phentsize); }
Elf_Half
get_e_phnum() const
{ return internal::convert_half<big_endian>(this->p_->e_phnum); }
{ return Convert<16, big_endian>::convert_host(this->p_->e_phnum); }
Elf_Half
get_e_shentsize() const
{ return internal::convert_half<big_endian>(this->p_->e_shentsize); }
{ return Convert<16, big_endian>::convert_host(this->p_->e_shentsize); }
Elf_Half
get_e_shnum() const
{ return internal::convert_half<big_endian>(this->p_->e_shnum); }
{ return Convert<16, big_endian>::convert_host(this->p_->e_shnum); }
Elf_Half
get_e_shstrndx() const
{ return internal::convert_half<big_endian>(this->p_->e_shstrndx); }
{ return Convert<16, big_endian>::convert_host(this->p_->e_shstrndx); }
private:
const internal::Ehdr_data<size>* p_;
@ -663,55 +646,55 @@ class Ehdr_write
void
put_e_type(Elf_Half v)
{ this->p_->e_type = internal::convert_half<big_endian>(v); }
{ this->p_->e_type = Convert<16, big_endian>::convert_host(v); }
void
put_e_machine(Elf_Half v)
{ this->p_->e_machine = internal::convert_half<big_endian>(v); }
{ this->p_->e_machine = Convert<16, big_endian>::convert_host(v); }
void
put_e_version(Elf_Word v)
{ this->p_->e_version = internal::convert_word<big_endian>(v); }
{ this->p_->e_version = Convert<32, big_endian>::convert_host(v); }
void
put_e_entry(typename Elf_types<size>::Elf_Addr v)
{ this->p_->e_entry = internal::convert_addr<size, big_endian>(v); }
{ this->p_->e_entry = Convert<size, big_endian>::convert_host(v); }
void
put_e_phoff(typename Elf_types<size>::Elf_Off v)
{ this->p_->e_phoff = internal::convert_off<size, big_endian>(v); }
{ this->p_->e_phoff = Convert<size, big_endian>::convert_host(v); }
void
put_e_shoff(typename Elf_types<size>::Elf_Off v)
{ this->p_->e_shoff = internal::convert_off<size, big_endian>(v); }
{ this->p_->e_shoff = Convert<size, big_endian>::convert_host(v); }
void
put_e_flags(Elf_Word v)
{ this->p_->e_flags = internal::convert_word<big_endian>(v); }
{ this->p_->e_flags = Convert<32, big_endian>::convert_host(v); }
void
put_e_ehsize(Elf_Half v)
{ this->p_->e_ehsize = internal::convert_half<big_endian>(v); }
{ this->p_->e_ehsize = Convert<16, big_endian>::convert_host(v); }
void
put_e_phentsize(Elf_Half v)
{ this->p_->e_phentsize = internal::convert_half<big_endian>(v); }
{ this->p_->e_phentsize = Convert<16, big_endian>::convert_host(v); }
void
put_e_phnum(Elf_Half v)
{ this->p_->e_phnum = internal::convert_half<big_endian>(v); }
{ this->p_->e_phnum = Convert<16, big_endian>::convert_host(v); }
void
put_e_shentsize(Elf_Half v)
{ this->p_->e_shentsize = internal::convert_half<big_endian>(v); }
{ this->p_->e_shentsize = Convert<16, big_endian>::convert_host(v); }
void
put_e_shnum(Elf_Half v)
{ this->p_->e_shnum = internal::convert_half<big_endian>(v); }
{ this->p_->e_shnum = Convert<16, big_endian>::convert_host(v); }
void
put_e_shstrndx(Elf_Half v)
{ this->p_->e_shstrndx = internal::convert_half<big_endian>(v); }
{ this->p_->e_shstrndx = Convert<16, big_endian>::convert_host(v); }
private:
internal::Ehdr_data<size>* p_;
@ -729,44 +712,44 @@ class Shdr
Elf_Word
get_sh_name() const
{ return internal::convert_word<big_endian>(this->p_->sh_name); }
{ return Convert<32, big_endian>::convert_host(this->p_->sh_name); }
Elf_Word
get_sh_type() const
{ return internal::convert_word<big_endian>(this->p_->sh_type); }
{ return Convert<32, big_endian>::convert_host(this->p_->sh_type); }
typename Elf_types<size>::Elf_WXword
get_sh_flags() const
{ return internal::convert_wxword<size, big_endian>(this->p_->sh_flags); }
{ return Convert<size, big_endian>::convert_host(this->p_->sh_flags); }
typename Elf_types<size>::Elf_Addr
get_sh_addr() const
{ return internal::convert_addr<size, big_endian>(this->p_->sh_addr); }
{ return Convert<size, big_endian>::convert_host(this->p_->sh_addr); }
typename Elf_types<size>::Elf_Off
get_sh_offset() const
{ return internal::convert_off<size, big_endian>(this->p_->sh_offset); }
{ return Convert<size, big_endian>::convert_host(this->p_->sh_offset); }
typename Elf_types<size>::Elf_WXword
get_sh_size() const
{ return internal::convert_wxword<size, big_endian>(this->p_->sh_size); }
{ return Convert<size, big_endian>::convert_host(this->p_->sh_size); }
Elf_Word
get_sh_link() const
{ return internal::convert_word<big_endian>(this->p_->sh_link); }
{ return Convert<32, big_endian>::convert_host(this->p_->sh_link); }
Elf_Word
get_sh_info() const
{ return internal::convert_word<big_endian>(this->p_->sh_info); }
{ return Convert<32, big_endian>::convert_host(this->p_->sh_info); }
typename Elf_types<size>::Elf_WXword
get_sh_addralign() const
{ return
internal::convert_wxword<size, big_endian>(this->p_->sh_addralign); }
Convert<size, big_endian>::convert_host(this->p_->sh_addralign); }
typename Elf_types<size>::Elf_WXword
get_sh_entsize() const
{ return internal::convert_wxword<size, big_endian>(this->p_->sh_entsize); }
{ return Convert<size, big_endian>::convert_host(this->p_->sh_entsize); }
private:
const internal::Shdr_data<size>* p_;
@ -784,43 +767,43 @@ class Shdr_write
void
put_sh_name(Elf_Word v)
{ this->p_->sh_name = internal::convert_word<big_endian>(v); }
{ this->p_->sh_name = Convert<32, big_endian>::convert_host(v); }
void
put_sh_type(Elf_Word v)
{ this->p_->sh_type = internal::convert_word<big_endian>(v); }
{ this->p_->sh_type = Convert<32, big_endian>::convert_host(v); }
void
put_sh_flags(typename Elf_types<size>::Elf_WXword v)
{ this->p_->sh_flags = internal::convert_wxword<size, big_endian>(v); }
{ this->p_->sh_flags = Convert<size, big_endian>::convert_host(v); }
void
put_sh_addr(typename Elf_types<size>::Elf_Addr v)
{ this->p_->sh_addr = internal::convert_addr<size, big_endian>(v); }
{ this->p_->sh_addr = Convert<size, big_endian>::convert_host(v); }
void
put_sh_offset(typename Elf_types<size>::Elf_Off v)
{ this->p_->sh_offset = internal::convert_off<size, big_endian>(v); }
{ this->p_->sh_offset = Convert<size, big_endian>::convert_host(v); }
void
put_sh_size(typename Elf_types<size>::Elf_WXword v)
{ this->p_->sh_size = internal::convert_wxword<size, big_endian>(v); }
{ this->p_->sh_size = Convert<size, big_endian>::convert_host(v); }
void
put_sh_link(Elf_Word v)
{ this->p_->sh_link = internal::convert_word<big_endian>(v); }
{ this->p_->sh_link = Convert<32, big_endian>::convert_host(v); }
void
put_sh_info(Elf_Word v)
{ this->p_->sh_info = internal::convert_word<big_endian>(v); }
{ this->p_->sh_info = Convert<32, big_endian>::convert_host(v); }
void
put_sh_addralign(typename Elf_types<size>::Elf_WXword v)
{ this->p_->sh_addralign = internal::convert_wxword<size, big_endian>(v); }
{ this->p_->sh_addralign = Convert<size, big_endian>::convert_host(v); }
void
put_sh_entsize(typename Elf_types<size>::Elf_WXword v)
{ this->p_->sh_entsize = internal::convert_wxword<size, big_endian>(v); }
{ this->p_->sh_entsize = Convert<size, big_endian>::convert_host(v); }
private:
internal::Shdr_data<size>* p_;
@ -838,35 +821,35 @@ class Phdr
Elf_Word
get_p_type() const
{ return internal::convert_word<big_endian>(this->p_->p_type); }
{ return Convert<32, big_endian>::convert_host(this->p_->p_type); }
typename Elf_types<size>::Elf_Off
get_p_offset() const
{ return internal::convert_off<size, big_endian>(this->p_->p_offset); }
{ return Convert<size, big_endian>::convert_host(this->p_->p_offset); }
typename Elf_types<size>::Elf_Addr
get_p_vaddr() const
{ return internal::convert_addr<size, big_endian>(this->p_->p_vaddr); }
{ return Convert<size, big_endian>::convert_host(this->p_->p_vaddr); }
typename Elf_types<size>::Elf_Addr
get_p_paddr() const
{ return internal::convert_addr<size, big_endian>(this->p_->p_paddr); }
{ return Convert<size, big_endian>::convert_host(this->p_->p_paddr); }
typename Elf_types<size>::Elf_WXword
get_p_filesz() const
{ return internal::convert_wxword<size, big_endian>(this->p_->p_filesz); }
{ return Convert<size, big_endian>::convert_host(this->p_->p_filesz); }
typename Elf_types<size>::Elf_WXword
get_p_memsz() const
{ return internal::convert_wxword<size, big_endian>(this->p_->p_memsz); }
{ return Convert<size, big_endian>::convert_host(this->p_->p_memsz); }
Elf_Word
get_p_flags() const
{ return internal::convert_word<big_endian>(this->p_->p_flags); }
{ return Convert<32, big_endian>::convert_host(this->p_->p_flags); }
typename Elf_types<size>::Elf_WXword
get_p_align() const
{ return internal::convert_wxword<size, big_endian>(this->p_->p_align); }
{ return Convert<size, big_endian>::convert_host(this->p_->p_align); }
private:
const internal::Phdr_data<size>* p_;
@ -884,35 +867,35 @@ class Phdr_write
void
put_p_type(Elf_Word v)
{ this->p_->p_type = internal::convert_word<big_endian>(v); }
{ this->p_->p_type = Convert<32, big_endian>::convert_host(v); }
void
put_p_offset(typename Elf_types<size>::Elf_Off v)
{ this->p_->p_offset = internal::convert_off<size, big_endian>(v); }
{ this->p_->p_offset = Convert<size, big_endian>::convert_host(v); }
void
put_p_vaddr(typename Elf_types<size>::Elf_Addr v)
{ this->p_->p_vaddr = internal::convert_addr<size, big_endian>(v); }
{ this->p_->p_vaddr = Convert<size, big_endian>::convert_host(v); }
void
put_p_paddr(typename Elf_types<size>::Elf_Addr v)
{ this->p_->p_paddr = internal::convert_addr<size, big_endian>(v); }
{ this->p_->p_paddr = Convert<size, big_endian>::convert_host(v); }
void
put_p_filesz(typename Elf_types<size>::Elf_WXword v)
{ this->p_->p_filesz = internal::convert_wxword<size, big_endian>(v); }
{ this->p_->p_filesz = Convert<size, big_endian>::convert_host(v); }
void
put_p_memsz(typename Elf_types<size>::Elf_WXword v)
{ this->p_->p_memsz = internal::convert_wxword<size, big_endian>(v); }
{ this->p_->p_memsz = Convert<size, big_endian>::convert_host(v); }
void
put_p_flags(Elf_Word v)
{ this->p_->p_flags = internal::convert_word<big_endian>(v); }
{ this->p_->p_flags = Convert<32, big_endian>::convert_host(v); }
void
put_p_align(typename Elf_types<size>::Elf_WXword v)
{ this->p_->p_align = internal::convert_wxword<size, big_endian>(v); }
{ this->p_->p_align = Convert<size, big_endian>::convert_host(v); }
private:
internal::Phdr_data<size>* p_;
@ -930,15 +913,15 @@ class Sym
Elf_Word
get_st_name() const
{ return internal::convert_word<big_endian>(this->p_->st_name); }
{ return Convert<32, big_endian>::convert_host(this->p_->st_name); }
typename Elf_types<size>::Elf_Addr
get_st_value() const
{ return internal::convert_addr<size, big_endian>(this->p_->st_value); }
{ return Convert<size, big_endian>::convert_host(this->p_->st_value); }
typename Elf_types<size>::Elf_WXword
get_st_size() const
{ return internal::convert_wxword<size, big_endian>(this->p_->st_size); }
{ return Convert<size, big_endian>::convert_host(this->p_->st_size); }
unsigned char
get_st_info() const
@ -966,7 +949,7 @@ class Sym
Elf_Half
get_st_shndx() const
{ return internal::convert_half<big_endian>(this->p_->st_shndx); }
{ return Convert<16, big_endian>::convert_host(this->p_->st_shndx); }
private:
const internal::Sym_data<size>* p_;
@ -984,15 +967,15 @@ class Sym_write
void
put_st_name(Elf_Word v)
{ this->p_->st_name = internal::convert_word<big_endian>(v); }
{ this->p_->st_name = Convert<32, big_endian>::convert_host(v); }
void
put_st_value(typename Elf_types<size>::Elf_Addr v)
{ this->p_->st_value = internal::convert_addr<size, big_endian>(v); }
{ this->p_->st_value = Convert<size, big_endian>::convert_host(v); }
void
put_st_size(typename Elf_types<size>::Elf_WXword v)
{ this->p_->st_size = internal::convert_wxword<size, big_endian>(v); }
{ this->p_->st_size = Convert<size, big_endian>::convert_host(v); }
void
put_st_info(unsigned char v)
@ -1012,7 +995,7 @@ class Sym_write
void
put_st_shndx(Elf_Half v)
{ this->p_->st_shndx = internal::convert_half<big_endian>(v); }
{ this->p_->st_shndx = Convert<16, big_endian>::convert_host(v); }
Sym<size, big_endian>
sym()
@ -1034,11 +1017,11 @@ class Rel
typename Elf_types<size>::Elf_Addr
get_r_offset() const
{ return internal::convert_addr<size, big_endian>(this->p_->r_offset); }
{ return Convert<size, big_endian>::convert_host(this->p_->r_offset); }
typename Elf_types<size>::Elf_WXword
get_r_info() const
{ return internal::convert_wxword<size, big_endian>(this->p_->r_info); }
{ return Convert<size, big_endian>::convert_host(this->p_->r_info); }
private:
const internal::Rel_data<size>* p_;
@ -1054,15 +1037,15 @@ class Rela
typename Elf_types<size>::Elf_Addr
get_r_offset() const
{ return internal::convert_addr<size, big_endian>(this->p_->r_offset); }
{ return Convert<size, big_endian>::convert_host(this->p_->r_offset); }
typename Elf_types<size>::Elf_WXword
get_r_info() const
{ return internal::convert_wxword<size, big_endian>(this->p_->r_info); }
{ return Convert<size, big_endian>::convert_host(this->p_->r_info); }
typename Elf_types<size>::Elf_Swxword
get_r_addend() const
{ return internal::convert_swxword<size, big_endian>(this->p_->r_addend); }
{ return Convert<size, big_endian>::convert_host(this->p_->r_addend); }
private:
const internal::Rela_data<size>* p_;

159
elfcpp/elfcpp_internal.h
View File

@ -5,8 +5,6 @@
#include "elfcpp_config.h"
#include <byteswap.h>
#ifndef ELFCPP_INTERNAL_H
#define ELFCPP_INTERNAL_H
@ -16,163 +14,6 @@ namespace elfcpp
namespace internal
{
#ifdef WORDS_BIGENDIAN
const bool host_big_endian = true;
#else
const bool host_big_endian = false;
#endif
// Conversion routines between target and host.
// Convert Elf_Half.
template<bool same_endian>
Elf_Half
convert_half_host(Elf_Half v);
template<>
inline Elf_Half
convert_half_host<true>(Elf_Half v)
{
return v;
}
template<>
inline Elf_Half
convert_half_host<false>(Elf_Half v)
{
return bswap_16(v);
}
template<bool big_endian>
inline Elf_Half
convert_half(Elf_Half v)
{
return convert_half_host<big_endian == host_big_endian>(v);
}
// Convert Elf_Word.
template<bool same_endian>
Elf_Word
convert_word_host(Elf_Word v);
template<>
inline Elf_Word
convert_word_host<true>(Elf_Word v)
{
return v;
}
template<>
inline Elf_Word
convert_word_host<false>(Elf_Word v)
{
return bswap_32(v);
}
template<bool big_endian>
inline Elf_Word
convert_word(Elf_Word v)
{
return convert_word_host<big_endian == host_big_endian>(v);
}
// Convert Elf_Xword.
template<bool same_endian>
Elf_Xword
convert_xword_host(Elf_Xword v);
template<>
inline Elf_Xword
convert_xword_host<true>(Elf_Xword v)
{
return v;
}
template<>
inline Elf_Xword
convert_xword_host<false>(Elf_Xword v)
{
return bswap_64(v);
}
template<bool big_endian>
inline Elf_Xword
convert_xword(Elf_Xword v)
{
return convert_xword_host<big_endian == host_big_endian>(v);
}
// Convert Elf_addr.
template<int size, bool same_endian>
typename Elf_types<size>::Elf_Addr
convert_addr_size(typename Elf_types<size>::Elf_Addr);
template<>
inline Elf_types<32>::Elf_Addr
convert_addr_size<32, true>(Elf_types<32>::Elf_Addr v)
{
return v;
}
template<>
inline Elf_types<64>::Elf_Addr
convert_addr_size<64, true>(Elf_types<64>::Elf_Addr v)
{
return v;
}
template<>
inline Elf_types<32>::Elf_Addr
convert_addr_size<32, false>(Elf_types<32>::Elf_Addr v)
{
return bswap_32(v);
}
template<>
inline Elf_types<64>::Elf_Addr
convert_addr_size<64, false>(Elf_types<64>::Elf_Addr v)
{
return bswap_64(v);
}
template<int size, bool big_endian>
inline typename Elf_types<size>::Elf_Addr
convert_addr(typename Elf_types<size>::Elf_Addr v)
{
return convert_addr_size<size, big_endian == host_big_endian>(v);
}
// Convert Elf_Off.
template<int size, bool big_endian>
inline typename Elf_types<size>::Elf_Off
convert_off(typename Elf_types<size>::Elf_Off v)
{
return convert_addr_size<size, big_endian == host_big_endian>(v);
}
// Convert Elf_WXword.
template<int size, bool big_endian>
inline typename Elf_types<size>::Elf_WXword
convert_wxword(typename Elf_types<size>::Elf_WXword v)
{
return convert_addr_size<size, big_endian == host_big_endian>(v);
}
// Convert ELF_Swxword.
template<int size, bool big_endian>
inline typename Elf_types<size>::Elf_Swxword
convert_swxword(typename Elf_types<size>::Elf_Swxword v)
{
return convert_addr_size<size, big_endian == host_big_endian>(v);
}
// The ELF file header.
template<int size>

350
elfcpp/elfcpp_swap.h Normal file
View File

@ -0,0 +1,350 @@
// elfcpp_swap.h -- Handle swapping for elfcpp -*- C++ -*-
// This header file defines basic template classes to efficiently swap
// numbers between host form and target form. When the host and
// target have the same endianness, these turn into no-ops.
#ifndef ELFCPP_SWAP_H
#define ELFCPP_SWAP_H
#include <stdint.h>
#include <endian.h>
#include <byteswap.h>
namespace elfcpp
{
// Endian simply indicates whether the host is big endian or not.
struct Endian
{
public:
// Used for template specializations.
static const bool host_big_endian = __BYTE_ORDER == __BIG_ENDIAN;
};
// Valtype_base is a template based on size (8, 16, 32, 64) which
// defines the type Valtype as the unsigned integer of the specified
// size.
template<int size>
struct Valtype_base;
template<>
struct Valtype_base<8>
{
typedef unsigned char Valtype;
};
template<>
struct Valtype_base<16>
{
typedef uint16_t Valtype;
};
template<>
struct Valtype_base<32>
{
typedef uint32_t Valtype;
};
template<>
struct Valtype_base<64>
{
typedef uint64_t Valtype;
};
// Convert_endian is a template based on size and on whether the host
// and target have the same endianness. It defines the type Valtype
// as Valtype_base does, and also defines a function convert_host
// which takes an argument of type Valtype and returns the same value,
// but swapped if the host and target have different endianness.
template<int size, bool same_endian>
struct Convert_endian;
template<int size>
struct Convert_endian<size, true>
{
typedef typename Valtype_base<size>::Valtype Valtype;
static inline Valtype
convert_host(Valtype v)
{ return v; }
};
template<>
struct Convert_endian<8, false>
{
typedef Valtype_base<8>::Valtype Valtype;
static inline Valtype
convert_host(Valtype v)
{ return v; }
};
template<>
struct Convert_endian<16, false>
{
typedef Valtype_base<16>::Valtype Valtype;
static inline Valtype
convert_host(Valtype v)
{ return bswap_16(v); }
};
template<>
struct Convert_endian<32, false>
{
typedef Valtype_base<32>::Valtype Valtype;
static inline Valtype
convert_host(Valtype v)
{ return bswap_32(v); }
};
template<>
struct Convert_endian<64, false>
{
typedef Valtype_base<64>::Valtype Valtype;
static inline Valtype
convert_host(Valtype v)
{ return bswap_64(v); }
};
// Convert is a template based on size and on whether the target is
// big endian. It defines Valtype and convert_host like
// Convert_endian. That is, it is just like Convert_endian except in
// the meaning of the second template parameter.
template<int size, bool big_endian>
struct Convert
{
typedef typename Valtype_base<size>::Valtype Valtype;
static inline Valtype
convert_host(Valtype v)
{
return Convert_endian<size, big_endian == Endian::host_big_endian>
::convert_host(v);
}
};
// Swap is a template based on size and on whether the target is big
// endian. It defines the type Valtype and the functions readval and
// writeval. The functions read and write values of the appropriate
// size out of buffers, swapping them if necessary. readval and
// writeval are overloaded to take pointers to the appropriate type or
// pointers to unsigned char.
template<int size, bool big_endian>
struct Swap
{
typedef typename Valtype_base<size>::Valtype Valtype;
static inline Valtype
readval(const Valtype* wv)
{ return Convert<size, big_endian>::convert_host(*wv); }
static inline void
writeval(Valtype* wv, Valtype v)
{ *wv = Convert<size, big_endian>::convert_host(v); }
static inline Valtype
readval(const unsigned char* wv)
{ return readval(reinterpret_cast<const Valtype*>(wv)); }
static inline void
writeval(unsigned char* wv, Valtype v)
{ writeval(reinterpret_cast<Valtype*>(wv), v); }
};
// We need to specialize the 8-bit version of Swap to avoid
// conflicting overloads, since both versions of readval and writeval
// will have the same type parameters.
template<bool big_endian>
struct Swap<8, big_endian>
{
typedef typename Valtype_base<8>::Valtype Valtype;
static inline Valtype
readval(const Valtype* wv)
{ return *wv; }
static inline void
writeval(Valtype* wv, Valtype v)
{ *wv = v; }
};
// Swap_unaligned is a template based on size and on whether the
// target is big endian. It defines the type Valtype and the
// functions readval_unaligned and writeval_unaligned. The functions
// read and write values of the appropriate size out of buffers which
// may be misaligned.
template<int size, bool big_endian>
struct Swap_unaligned;
template<bool big_endian>
struct Swap_unaligned<8, big_endian>
{
typedef typename Valtype_base<8>::Valtype Valtype;
static inline Valtype
readval_unaligned(const unsigned char* wv)
{ return *wv; }
static inline void
writeval_unaligned(unsigned char* wv, Valtype v)
{ *wv = v; }
};
template<>
struct Swap_unaligned<16, false>
{
typedef Valtype_base<16>::Valtype Valtype;
static inline Valtype
readval_unaligned(const unsigned char* wv)
{
return (wv[1] << 8) | wv[0];
}
static inline void
writeval_unaligned(unsigned char* wv, Valtype v)
{
wv[1] = v >> 8;
wv[0] = v;
}
};
template<>
struct Swap_unaligned<16, true>
{
typedef Valtype_base<16>::Valtype Valtype;
static inline Valtype
readval_unaligned(const unsigned char* wv)
{
return (wv[0] << 8) | wv[1];
}
static inline void
writeval_unaligned(unsigned char* wv, Valtype v)
{
wv[0] = v >> 8;
wv[1] = v;
}
};
template<>
struct Swap_unaligned<32, false>
{
typedef Valtype_base<32>::Valtype Valtype;
static inline Valtype
readval_unaligned(const unsigned char* wv)
{
return (wv[3] << 24) | (wv[2] << 16) | (wv[1] << 8) | wv[0];
}
static inline void
writeval_unaligned(unsigned char* wv, Valtype v)
{
wv[3] = v >> 24;
wv[2] = v >> 16;
wv[1] = v >> 8;
wv[0] = v;
}
};
template<>
struct Swap_unaligned<32, true>
{
typedef Valtype_base<32>::Valtype Valtype;
static inline Valtype
readval_unaligned(const unsigned char* wv)
{
return (wv[0] << 24) | (wv[1] << 16) | (wv[2] << 8) | wv[3];
}
static inline void
writeval_unaligned(unsigned char* wv, Valtype v)
{
wv[0] = v >> 24;
wv[1] = v >> 16;
wv[2] = v >> 8;
wv[3] = v;
}
};
template<>
struct Swap_unaligned<64, false>
{
typedef Valtype_base<64>::Valtype Valtype;
static inline Valtype
readval_unaligned(const unsigned char* wv)
{
return ((static_cast<Valtype>(wv[7]) << 56)
| (static_cast<Valtype>(wv[6]) << 48)
| (static_cast<Valtype>(wv[5]) << 40)
| (static_cast<Valtype>(wv[4]) << 32)
| (static_cast<Valtype>(wv[3]) << 24)
| (static_cast<Valtype>(wv[2]) << 16)
| (static_cast<Valtype>(wv[1]) << 8)
| static_cast<Valtype>(wv[0]));
}
static inline void
writeval_unaligned(unsigned char* wv, Valtype v)
{
wv[7] = v >> 56;
wv[6] = v >> 48;
wv[5] = v >> 40;
wv[4] = v >> 32;
wv[3] = v >> 24;
wv[2] = v >> 16;
wv[1] = v >> 8;
wv[0] = v;
}
};
template<>
struct Swap_unaligned<64, true>
{
typedef Valtype_base<64>::Valtype Valtype;
static inline Valtype
readval_unaligned(const unsigned char* wv)
{
return ((static_cast<Valtype>(wv[0]) << 56)
| (static_cast<Valtype>(wv[1]) << 48)
| (static_cast<Valtype>(wv[2]) << 40)
| (static_cast<Valtype>(wv[3]) << 32)
| (static_cast<Valtype>(wv[4]) << 24)
| (static_cast<Valtype>(wv[5]) << 16)
| (static_cast<Valtype>(wv[6]) << 8)
| static_cast<Valtype>(wv[7]));
}
static inline void
writeval_unaligned(unsigned char* wv, Valtype v)
{
wv[7] = v >> 56;
wv[6] = v >> 48;
wv[5] = v >> 40;
wv[4] = v >> 32;
wv[3] = v >> 24;
wv[2] = v >> 16;
wv[1] = v >> 8;
wv[0] = v;
}
};
} // End namespace elfcpp.
#endif // !defined(ELFCPP_SWAP_H)