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/* Pedantic checking of DWARF files.
Copyright (C) 2011 Red Hat, Inc.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
elfutils is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "files.hh"
#include "messages.hh"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sstream>
#include <cstring>
#include <cerrno>
#include <stdexcept>
namespace
{
inline bool failed (void *ptr) { return ptr == NULL; }
inline bool failed (int i) { return i < 0; }
template <class T>
inline T
throw_if_failed (T x, char const *msg,
char const *(*errmsgcb) (int) = NULL)
{
if (unlikely (failed (x)))
{
std::stringstream ss;
ss << msg;
if (errmsgcb != NULL)
ss << ": " << errmsgcb (-1);
throw std::runtime_error (ss.str ());
}
return x;
}
char const *
mystrerror (int i)
{
if (i == -1)
i = errno;
return strerror (i);
}
}
int
files::open (char const *fname)
{
int fd = ::open (fname, O_RDONLY);
if (fd == -1)
{
std::stringstream ss;
ss << "Cannot open input file: " << strerror (errno) << ".";
throw std::runtime_error (ss.str ());
}
return fd;
}
Dwfl *
files::open_dwfl ()
{
static class my_callbacks
: public Dwfl_Callbacks
{
// Stub libdwfl callback, only the ELF handle already open is ever used.
static int
find_no_debuginfo (Dwfl_Module *mod __attribute__ ((unused)),
void **userdata __attribute__ ((unused)),
const char *modname __attribute__ ((unused)),
Dwarf_Addr base __attribute__ ((unused)),
const char *file_name __attribute__ ((unused)),
const char *debuglink_file __attribute__ ((unused)),
GElf_Word debuglink_crc __attribute__ ((unused)),
char **debuginfo_file_name __attribute__ ((unused)))
{
return -1;
}
public:
my_callbacks ()
{
section_address = dwfl_offline_section_address;
find_debuginfo = find_no_debuginfo;
}
} cbs;
return throw_if_failed (dwfl_begin (&cbs),
"Couldn't initialize DWFL");
}
Dwarf *
files::open_dwarf (Dwfl *dwfl, char const *fname, int fd)
{
dwfl_report_begin (dwfl);
// Dup FD for dwfl to consume.
int dwfl_fd
= throw_if_failed (dup (fd), "Error: dup", mystrerror);
Dwfl_Module *mod
= throw_if_failed (dwfl_report_offline (dwfl, fname, fname, dwfl_fd),
"Couldn't add DWFL module", dwfl_errmsg);
dwfl_report_end (dwfl, NULL, NULL);
Dwarf_Addr bias;
throw_if_failed (dwfl_module_getelf (mod, &bias),
"Couldn't open ELF.", dwfl_errmsg);
return throw_if_failed (dwfl_module_getdwarf (mod, &bias),
"Couldn't obtain DWARF descriptor", dwfl_errmsg);
}
elfutils::dwarf
files::open_dwarf (Dwarf *dw)
try
{
return dw;
}
catch (...)
{
throw std::runtime_error
("Couldn't initialize high-level DWARF descriptor");
}
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