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104 lines
2.9 KiB
104 lines
2.9 KiB
/* Return block represented by attribute.
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Copyright (C) 2004-2010, 2014, 2018 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 2004.
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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_formblock (Dwarf_Attribute *attr, Dwarf_Block *return_block)
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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_block1:
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if (unlikely (endp - datap < 1))
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goto invalid;
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return_block->length = *(uint8_t *) attr->valp;
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return_block->data = attr->valp + 1;
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break;
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case DW_FORM_block2:
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if (unlikely (endp - datap < 2))
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goto invalid;
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return_block->length = read_2ubyte_unaligned (attr->cu->dbg, attr->valp);
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return_block->data = attr->valp + 2;
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break;
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case DW_FORM_block4:
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if (unlikely (endp - datap < 4))
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goto invalid;
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return_block->length = read_4ubyte_unaligned (attr->cu->dbg, attr->valp);
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return_block->data = attr->valp + 4;
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break;
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case DW_FORM_block:
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case DW_FORM_exprloc:
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if (unlikely (endp - datap < 1))
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goto invalid;
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get_uleb128 (return_block->length, datap, endp);
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return_block->data = (unsigned char *) datap;
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break;
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case DW_FORM_data16:
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/* The DWARFv5 spec calls this constant class, but we interpret
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it as a block that the user will need to interpret when
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converting to a value. */
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if (unlikely (endp - datap < 16))
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goto invalid;
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return_block->length = 16;
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return_block->data = (unsigned char *) datap;
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break;
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default:
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__libdw_seterrno (DWARF_E_NO_BLOCK);
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return -1;
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}
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if (unlikely (return_block->length > (size_t) (endp - return_block->data)))
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{
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/* Block does not fit. */
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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 0;
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}
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INTDEF(dwarf_formblock)
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