libdwarf/dwarf_form.c

/* Helper functions for form handling.
   Copyright (C) 2000, 2002 Red Hat, Inc.
   This file is part of Red Hat elfutils.
   Written by Ulrich Drepper <drepper@redhat.com>, 2000.

   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>.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <dwarf.h>
#include <string.h>

#include <libdwarfP.h>


int
internal_function
__libdwarf_form_val_len (Dwarf_Debug dbg, Dwarf_CU_Info cu, Dwarf_Word form,
			 Dwarf_Small *valp, size_t *len, Dwarf_Error *error)
{
  Dwarf_Small *saved;
  Dwarf_Word u128;

  switch (form)
    {
    case DW_FORM_addr:
    case DW_FORM_strp:
    case DW_FORM_ref_addr:
      *len = cu->address_size;
      break;

    case DW_FORM_block1:
      *len = *valp + 1;
      break;

    case DW_FORM_block2:
      *len = read_2ubyte_unaligned (dbg, valp) + 2;
      break;

    case DW_FORM_block4:
      *len = read_4ubyte_unaligned (dbg, valp) + 4;
      break;

    case DW_FORM_block:
      saved = valp;
      get_uleb128 (u128, valp);
      *len = u128 + (valp - saved);
      break;

    case DW_FORM_ref1:
    case DW_FORM_data1:
    case DW_FORM_flag:
      *len = 1;
      break;

    case DW_FORM_data2:
    case DW_FORM_ref2:
      *len = 2;
      break;

    case DW_FORM_data4:
    case DW_FORM_ref4:
      *len = 4;
      break;

    case DW_FORM_data8:
    case DW_FORM_ref8:
      *len = 8;
      break;

    case DW_FORM_string:
      *len = strlen ((char *) valp) + 1;
      break;

    case DW_FORM_sdata:
    case DW_FORM_udata:
    case DW_FORM_ref_udata:
      saved = valp;
      get_uleb128 (u128, valp);
      *len = valp - saved;
      break;

    case DW_FORM_indirect:
      saved = valp;
      get_uleb128 (u128, valp);
      if (__libdwarf_form_val_len (dbg, cu, u128, valp, len, error)
	  != DW_DLV_OK)
	return DW_DLV_ERROR;
      *len += valp - saved;
      break;

    default:
      __libdwarf_error (dbg, error, DW_E_INVALID_DWARF);
      return DW_DLV_ERROR;
    }

  return DW_DLV_OK;
}