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102 lines
2.6 KiB
102 lines
2.6 KiB
4 months ago
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/* Return signed constant represented by attribute.
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Copyright (C) 2003, 2005, 2014, 2017 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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dwarf_formsdata (Dwarf_Attribute *attr, Dwarf_Sword *return_sval)
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{
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if (attr == NULL)
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return -1;
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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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switch (attr->form)
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{
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case DW_FORM_data1:
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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_sval = (signed char) *attr->valp;
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break;
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case DW_FORM_data2:
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if (datap + 2 > endp)
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goto invalid;
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*return_sval = read_2sbyte_unaligned (attr->cu->dbg, attr->valp);
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break;
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case DW_FORM_data4:
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if (datap + 4 > endp)
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goto invalid;
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*return_sval = read_4sbyte_unaligned (attr->cu->dbg, attr->valp);
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break;
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case DW_FORM_data8:
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if (datap + 8 > endp)
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goto invalid;
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*return_sval = read_8sbyte_unaligned (attr->cu->dbg, attr->valp);
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break;
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case DW_FORM_sdata:
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if (datap + 1 > endp)
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goto invalid;
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get_sleb128 (*return_sval, datap, endp);
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break;
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case DW_FORM_udata:
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if (datap + 1 > endp)
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goto invalid;
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get_uleb128 (*return_sval, datap, endp);
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break;
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case DW_FORM_implicit_const:
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// The data comes from the abbrev, which has been bounds checked.
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get_sleb128_unchecked (*return_sval, datap);
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break;
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default:
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__libdw_seterrno (DWARF_E_NO_CONSTANT);
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return -1;
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}
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return 0;
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}
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INTDEF(dwarf_formsdata)
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