/* Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
   This file is part of Red Hat elfutils.
   Written by Ulrich Drepper <drepper@redhat.com>, 1998.

   Red Hat elfutils 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; version 2 of the License.

   Red Hat 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 Red Hat elfutils; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.

   Red Hat elfutils is an included package of the Open Invention Network.
   An included package of the Open Invention Network is a package for which
   Open Invention Network licensees cross-license their patents.  No patent
   license is granted, either expressly or impliedly, by designation as an
   included package.  Should you wish to participate in the Open Invention
   Network licensing program, please visit www.openinventionnetwork.com
   <http://www.openinventionnetwork.com>.  */

#include <config.h>

#include <fcntl.h>
#include <libelf.h>
#include <libdwarf.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

int
main (int argc, char *argv[])
{
  int cnt;

  for (cnt = 1; cnt < argc; ++cnt)
    {
      int fd = open (argv[cnt], O_RDONLY);
      Dwarf_Debug dbg;
      Dwarf_Signed cie_cnt;
      Dwarf_Cie *cie_data;
      Dwarf_Signed fde_cnt;
      Dwarf_Fde *fde_data;
      Dwarf_Error err;

       if (dwarf_init (fd, DW_DLC_READ, NULL, NULL, &dbg, &err) != DW_DLV_OK)
	 {
	   printf ("%s not usable: %s\n", argv[cnt], dwarf_errmsg (err));
	   continue;
	 }
      else if (dwarf_get_fde_list_eh (dbg, &cie_data, &cie_cnt, &fde_data,
				      &fde_cnt, &err) != DW_DLV_OK)
	printf ("cannot get CIEs and FDEs from %s: %s\n", argv[cnt],
		dwarf_errmsg (err));
      else
	{
	  Dwarf_Addr low_pc;
	  Dwarf_Addr high_pc;
	  Dwarf_Unsigned func_length;
	  Dwarf_Ptr fde_bytes;
	  Dwarf_Unsigned fde_byte_length;
	  Dwarf_Off cie_offset;
	  Dwarf_Signed cie_index;
	  Dwarf_Off fde_offset;
	  Dwarf_Fde fde;
	  int i;

	  printf ("%s has %lld CIEs and %lld FDEs\n",
		  basename (argv[cnt]),
		  (long long int) cie_cnt, (long long int) fde_cnt);

	  for (i = 0; i < cie_cnt; ++i)
	    {
	      Dwarf_Unsigned bytes_in_cie;
	      Dwarf_Small version;
	      char *augmenter;
	      Dwarf_Unsigned code_alignment_factor;
	      Dwarf_Signed data_alignment_factor;
	      Dwarf_Half return_address_register;
	      Dwarf_Ptr initial_instructions;
	      Dwarf_Unsigned initial_instructions_length;

	      if (dwarf_get_cie_info (cie_data[i], &bytes_in_cie, &version,
				      &augmenter, &code_alignment_factor,
				      &data_alignment_factor,
				      &return_address_register,
				      &initial_instructions,
				      &initial_instructions_length, &err)
		  != DW_DLV_OK)
		printf ("cannot get info for CIE %d: %s\n", i,
			dwarf_errmsg (err));
	      else
		{
		  size_t j;

		  printf ("CIE[%d]: bytes_in_cie = %llu, version = %hhd, augmenter = \"%s\"\n",
			  i, (unsigned long long int) bytes_in_cie, version,
			  augmenter);
		  printf ("CIE[%d]: code_alignment_factor = %llx\n"
			  "CIE[%d]: data_alignment_factor = %llx\n"
			  "CIE[%d]: return_address_register = %hu\n"
			  "CIE[%d]: bytes =",
			  i, (unsigned long long int) code_alignment_factor,
			  i, (unsigned long long int) data_alignment_factor,
			  i, return_address_register, i);

		  for (j = 0; j < initial_instructions_length; ++j)
		    printf (" %02hhx",
			    ((unsigned char *) initial_instructions)[j]);

		  putchar ('\n');
		}
	    }

	  for (i = 0; i < fde_cnt; ++i)
	    {
	      Dwarf_Cie cie;

	      if (dwarf_get_fde_range (fde_data[i], &low_pc, &func_length,
				       &fde_bytes, &fde_byte_length,
				       &cie_offset, &cie_index, &fde_offset,
				       &err) != DW_DLV_OK)
		printf ("cannot get range of FDE %d: %s\n", i,
			dwarf_errmsg (err));
	      else
		{
		  size_t j;
		  Dwarf_Ptr instrs;
		  Dwarf_Unsigned len;

		  printf ("FDE[%d]: low_pc = %#llx, length = %llu\n", i,
			  (unsigned long long int) low_pc,
			  (unsigned long long int) func_length);
		  printf ("FDE[%d]: bytes =", i);

		  for (j = 0; j < fde_byte_length; ++j)
		    printf (" %02hhx", ((unsigned char *) fde_bytes)[j]);

		  printf ("\nFDE[%d]: cie_offset = %lld, cie_index = %lld, fde_offset = %lld\n",
			  i, (long long int) cie_offset,
			  (long long int) cie_index,
			  (long long int) fde_offset);

		  if (dwarf_get_fde_instr_bytes (fde_data[i], &instrs, &len,
						 &err) != DW_DLV_OK)
		    printf ("cannot get instructions of FDE %d: %s\n", i,
			    dwarf_errmsg (err));
		  else
		    {
		      printf ("FDE[%d]: instructions =", i);

		      for (j = 0; j < len; ++j)
			printf (" %02hhx", ((unsigned char *) instrs)[j]);

		      putchar ('\n');
		    }

		  /* Consistency check.  */
		  if (dwarf_get_cie_of_fde (fde_data[i], &cie, &err)
		      != DW_DLV_OK)
		    printf ("cannot get CIE of FDE %d: %s\n", i,
			    dwarf_errmsg (err));
		  else if (cie_data[cie_index] != cie)
		    puts ("cie_index for FDE[%d] does not match dwarf_get_cie_of_fde result");
		}

	      if (dwarf_get_fde_n (fde_data, i, &fde, &err) != DW_DLV_OK)
		printf ("dwarf_get_fde_n for FDE[%d] failed\n", i);
	      else if (fde != fde_data[i])
		printf ("dwarf_get_fde_n for FDE[%d] didn't return the right value\n", i);
	    }

	  if (dwarf_get_fde_n (fde_data, fde_cnt, &fde, &err)
	      != DW_DLV_NO_ENTRY)
	    puts ("dwarf_get_fde_n for invalid index doesn't return DW_DLV_NO_ENTRY");

	  {
	    const unsigned int addrs[] =
	      {
		0x8048400, 0x804842c, 0x8048454, 0x8048455, 0x80493fc
	      };
	    const int naddrs = sizeof (addrs) / sizeof (addrs[0]);

	    for (i = 0; i < naddrs; ++i)
	      if (dwarf_get_fde_at_pc (fde_data, addrs[i], &fde, &low_pc,
				       &high_pc, &err) != DW_DLV_OK)
		printf ("no FDE at %x\n", addrs[i]);
	      else
		{
		  Dwarf_Addr other_low_pc;

		  if (dwarf_get_fde_range (fde, &other_low_pc, &func_length,
					   &fde_bytes, &fde_byte_length,
					   &cie_offset, &cie_index,
					   &fde_offset, &err) != DW_DLV_OK)
		    printf ("cannot get range of FDE returned by dwarf_get_fde_at_pc for %u: %s\n",
			    addrs[i], dwarf_errmsg (err));
		  else
		    {
		      printf ("FDE[@%x]: cie_offset = %lld, cie_index = %lld, fde_offset = %lld\n",
			      addrs[i],
			      (long long int) cie_offset,
			      (long long int) cie_index,
			      (long long int) fde_offset);

		      if (low_pc != other_low_pc)
			printf ("low_pc returned by dwarf_get_fde_at_pc for %x and dwarf_get_fde_range differs",
				addrs[i]);

		      if (high_pc != low_pc + func_length - 1)
			printf ("high_pc returned by dwarf_get_fde_at_pc for %x and dwarf_get_fde_range differs",
				addrs[i]);
		    }
		}
	  }
	}

      if (dwarf_finish (dbg, &err) != DW_DLV_OK)
	printf ("dwarf_finish failed for %s: %s\n", argv[cnt],
		dwarf_errmsg (err));

      close (fd);
    }

  return 0;
}