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112 lines
2.9 KiB
112 lines
2.9 KiB
/* Return reference offset represented by attribute. |
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Copyright (C) 2003-2010, 2014 Red Hat, Inc. |
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This file is part of elfutils. |
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Written by Ulrich Drepper <drepper@redhat.com>, 2003. |
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This file is free software; you can redistribute it and/or modify |
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it under the terms of either |
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* the GNU Lesser General Public License as published by the Free |
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Software Foundation; either version 3 of the License, or (at |
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your option) any later version |
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or |
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* the GNU General Public License as published by the Free |
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Software Foundation; either version 2 of the License, or (at |
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your option) any later version |
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or both in parallel, as here. |
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elfutils is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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You should have received copies of the GNU General Public License and |
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the GNU Lesser General Public License along with this program. If |
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not, see <http://www.gnu.org/licenses/>. */ |
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#ifdef HAVE_CONFIG_H |
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# include <config.h> |
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#endif |
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#include <dwarf.h> |
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#include "libdwP.h" |
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int |
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internal_function |
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__libdw_formref (Dwarf_Attribute *attr, Dwarf_Off *return_offset) |
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{ |
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const unsigned char *datap = attr->valp; |
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const unsigned char *endp = attr->cu->endp; |
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if (attr->valp == NULL) |
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{ |
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__libdw_seterrno (DWARF_E_INVALID_REFERENCE); |
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return -1; |
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} |
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switch (attr->form) |
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{ |
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case DW_FORM_ref1: |
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if (datap + 1 > endp) |
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{ |
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invalid: |
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__libdw_seterrno (DWARF_E_INVALID_DWARF); |
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return -1; |
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} |
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*return_offset = *attr->valp; |
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break; |
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case DW_FORM_ref2: |
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if (datap + 2 > endp) |
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goto invalid; |
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*return_offset = read_2ubyte_unaligned (attr->cu->dbg, attr->valp); |
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break; |
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case DW_FORM_ref4: |
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if (datap + 4 > endp) |
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goto invalid; |
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*return_offset = read_4ubyte_unaligned (attr->cu->dbg, attr->valp); |
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break; |
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case DW_FORM_ref8: |
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if (datap + 8 > endp) |
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goto invalid; |
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*return_offset = read_8ubyte_unaligned (attr->cu->dbg, attr->valp); |
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break; |
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case DW_FORM_ref_udata: |
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if (datap + 1 > endp) |
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goto invalid; |
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get_uleb128 (*return_offset, datap, endp); |
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break; |
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case DW_FORM_ref_addr: |
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case DW_FORM_ref_sig8: |
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case DW_FORM_GNU_ref_alt: |
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case DW_FORM_ref_sup4: |
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case DW_FORM_ref_sup8: |
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/* These aren't handled by dwarf_formref, only by dwarf_formref_die. */ |
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__libdw_seterrno (DWARF_E_INVALID_REFERENCE); |
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return -1; |
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default: |
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__libdw_seterrno (DWARF_E_NO_REFERENCE); |
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return -1; |
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} |
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return 0; |
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} |
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/* This is the old public entry point. |
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It is now deprecated in favor of dwarf_formref_die. */ |
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int |
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dwarf_formref (Dwarf_Attribute *attr, Dwarf_Off *return_offset) |
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{ |
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if (attr == NULL) |
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return -1; |
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return __libdw_formref (attr, return_offset); |
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}
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