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78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
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/* Get CFA expression for frame.
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Copyright (C) 2009-2010 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 "cfi.h"
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#include <dwarf.h>
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#include <stdlib.h>
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int
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dwarf_frame_cfa (Dwarf_Frame *fs, Dwarf_Op **ops, size_t *nops)
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{
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/* Maybe there was a previous error. */
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if (fs == NULL)
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return -1;
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int result = 0;
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switch (fs->cfa_rule)
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{
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case cfa_undefined:
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*ops = NULL;
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*nops = 0;
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break;
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case cfa_offset:
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/* The Dwarf_Op was already fully initialized by execute_cfi. */
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*ops = &fs->cfa_data.offset;
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*nops = 1;
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break;
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case cfa_expr:
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/* Parse the expression into internal form. */
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result = __libdw_intern_expression
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(NULL, fs->cache->other_byte_order,
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fs->cache->e_ident[EI_CLASS] == ELFCLASS32 ? 4 : 8, 4,
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&fs->cache->expr_tree, &fs->cfa_data.expr, false, false,
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ops, nops, IDX_debug_frame);
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break;
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case cfa_invalid:
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__libdw_seterrno (DWARF_E_INVALID_CFI);
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result = -1;
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break;
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default:
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abort ();
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}
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return result;
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}
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