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/* Return DIE associated with a location expression op.
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Copyright (C) 2013, 2017 Red Hat, Inc.
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This file is part of elfutils.
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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_getlocation_die (Dwarf_Attribute *attr, const Dwarf_Op *op,
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Dwarf_Die *result)
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{
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if (attr == NULL)
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return -1;
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Dwarf_Off dieoff;
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switch (op->atom)
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{
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case DW_OP_implicit_pointer:
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case DW_OP_GNU_implicit_pointer:
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case DW_OP_call_ref:
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case DW_OP_GNU_variable_value:
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dieoff = op->number;
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break;
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case DW_OP_GNU_parameter_ref:
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case DW_OP_convert:
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case DW_OP_GNU_convert:
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case DW_OP_reinterpret:
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case DW_OP_GNU_reinterpret:
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case DW_OP_const_type:
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case DW_OP_GNU_const_type:
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case DW_OP_call2:
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case DW_OP_call4:
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if (op->number > (attr->cu->end - attr->cu->start))
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{
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invalid_offset:
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__libdw_seterrno (DWARF_E_INVALID_OFFSET);
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return -1;
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}
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dieoff = attr->cu->start + op->number;
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break;
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case DW_OP_regval_type:
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case DW_OP_GNU_regval_type:
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case DW_OP_deref_type:
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case DW_OP_GNU_deref_type:
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if (op->number2 > (attr->cu->end - attr->cu->start))
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goto invalid_offset;
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dieoff = attr->cu->start + op->number2;
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break;
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case DW_OP_xderef_type:
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dieoff = op->number2;
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break;
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default:
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__libdw_seterrno (DWARF_E_INVALID_ACCESS);
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return -1;
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}
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if (__libdw_offdie (attr->cu->dbg, dieoff, result,
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ISV4TU(attr->cu)) == NULL)
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return -1;
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return 0;
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}
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INTDEF(dwarf_getlocation_die);
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