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* elfcpp_swap.h (struct Swap_aligned32): New template.

gold/

	* gdb-index.cc (Gdb_index::do_write): Use Swap_aligned32 for writing
	CU range table of gdb index.
This commit is contained in:
Cary Coutant
2012-04-23 23:31:15 +00:00
parent 34431a2aa1
commit 1d50909894
4 changed files with 78 additions and 3 deletions
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67
elfcpp/elfcpp_swap.h
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@ -1,6 +1,6 @@
// elfcpp_swap.h -- Handle swapping for elfcpp -*- C++ -*-
// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
// Copyright 2006, 2007, 2008, 2009, 2012 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of elfcpp.
@ -430,6 +430,71 @@ struct Swap_unaligned<64, true>
}
};
// Swap_aligned32 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 which may not be
// 64-bit aligned, but are 32-bit aligned.
template<int size, bool big_endian>
struct Swap_aligned32
{
typedef typename Valtype_base<size>::Valtype Valtype;
static inline Valtype
readval(const unsigned char* wv)
{ return Swap<size, big_endian>::readval(
reinterpret_cast<const Valtype*>(wv)); }
static inline void
writeval(unsigned char* wv, Valtype v)
{ Swap<size, big_endian>::writeval(reinterpret_cast<Valtype*>(wv), v); }
};
template<>
struct Swap_aligned32<64, true>
{
typedef Valtype_base<64>::Valtype Valtype;
static inline Valtype
readval(const unsigned char* wv)
{
return ((static_cast<Valtype>(Swap<32, true>::readval(wv)) << 32)
| static_cast<Valtype>(Swap<32, true>::readval(wv + 4)));
}
static inline void
writeval(unsigned char* wv, Valtype v)
{
typedef Valtype_base<32>::Valtype Valtype32;
Swap<32, true>::writeval(wv, static_cast<Valtype32>(v >> 32));
Swap<32, true>::writeval(wv + 4, static_cast<Valtype32>(v));
}
};
template<>
struct Swap_aligned32<64, false>
{
typedef Valtype_base<64>::Valtype Valtype;
static inline Valtype
readval(const unsigned char* wv)
{
return ((static_cast<Valtype>(Swap<32, false>::readval(wv + 4)) << 32)
| static_cast<Valtype>(Swap<32, false>::readval(wv)));
}
static inline void
writeval(unsigned char* wv, Valtype v)
{
typedef Valtype_base<32>::Valtype Valtype32;
Swap<32, false>::writeval(wv + 4, static_cast<Valtype32>(v >> 32));
Swap<32, false>::writeval(wv, static_cast<Valtype32>(v));
}
};
} // End namespace elfcpp.
#endif // !defined(ELFCPP_SWAP_H)