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120 lines
3.1 KiB
C
120 lines
3.1 KiB
C
/* Return DWARF attribute associated with a location expression op.
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Copyright (C) 2013, 2014 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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static Dwarf_CU *
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attr_form_cu (Dwarf_Attribute *attr)
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{
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/* If the attribute has block/expr form the data comes from the
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.debug_info from the same cu as the attr. Otherwise it comes from
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the .debug_loc data section. */
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switch (attr->form)
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{
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case DW_FORM_block1:
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case DW_FORM_block2:
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case DW_FORM_block4:
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case DW_FORM_block:
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case DW_FORM_exprloc:
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return attr->cu;
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default:
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return attr->cu->dbg->fake_loc_cu;
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}
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}
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int
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dwarf_getlocation_attr (Dwarf_Attribute *attr, const Dwarf_Op *op, Dwarf_Attribute *result)
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{
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if (attr == NULL)
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return -1;
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switch (op->atom)
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{
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case DW_OP_implicit_value:
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result->code = DW_AT_const_value;
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result->form = DW_FORM_block;
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result->valp = (unsigned char *) (uintptr_t) op->number2;
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result->cu = attr_form_cu (attr);
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break;
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case DW_OP_GNU_entry_value:
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result->code = DW_AT_location;
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result->form = DW_FORM_exprloc;
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result->valp = (unsigned char *) (uintptr_t) op->number2;
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result->cu = attr_form_cu (attr);
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break;
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case DW_OP_GNU_const_type:
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result->code = DW_AT_const_value;
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result->form = DW_FORM_block1;
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result->valp = (unsigned char *) (uintptr_t) op->number2;
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result->cu = attr_form_cu (attr);
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break;
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case DW_OP_call2:
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case DW_OP_call4:
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case DW_OP_call_ref:
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{
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Dwarf_Die die;
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if (INTUSE(dwarf_getlocation_die) (attr, op, &die) != 0)
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return -1;
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if (INTUSE(dwarf_attr) (&die, DW_AT_location, result) == NULL)
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{
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__libdw_empty_loc_attr (result);
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return 0;
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}
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}
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break;
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case DW_OP_GNU_implicit_pointer:
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{
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Dwarf_Die die;
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if (INTUSE(dwarf_getlocation_die) (attr, op, &die) != 0)
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return -1;
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if (INTUSE(dwarf_attr) (&die, DW_AT_location, result) == NULL
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&& INTUSE(dwarf_attr) (&die, DW_AT_const_value, result) == NULL)
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{
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__libdw_empty_loc_attr (result);
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return 0;
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}
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}
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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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return 0;
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}
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