Line data    Source code

       1             : /* Get CFA expression for frame.
       2             :    Copyright (C) 2009-2010 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             : 
       5             :    This file is free software; you can redistribute it and/or modify
       6             :    it under the terms of either
       7             : 
       8             :      * the GNU Lesser General Public License as published by the Free
       9             :        Software Foundation; either version 3 of the License, or (at
      10             :        your option) any later version
      11             : 
      12             :    or
      13             : 
      14             :      * the GNU General Public License as published by the Free
      15             :        Software Foundation; either version 2 of the License, or (at
      16             :        your option) any later version
      17             : 
      18             :    or both in parallel, as here.
      19             : 
      20             :    elfutils is distributed in the hope that it will be useful, but
      21             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      22             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23             :    General Public License for more details.
      24             : 
      25             :    You should have received copies of the GNU General Public License and
      26             :    the GNU Lesser General Public License along with this program.  If
      27             :    not, see <http://www.gnu.org/licenses/>.  */
      28             : 
      29             : #ifdef HAVE_CONFIG_H
      30             : # include <config.h>
      31             : #endif
      32             : 
      33             : #include "cfi.h"
      34             : #include <dwarf.h>
      35             : #include <stdlib.h>
      36             : 
      37             : int
      38        5346 : dwarf_frame_cfa (Dwarf_Frame *fs, Dwarf_Op **ops, size_t *nops)
      39             : {
      40             :   /* Maybe there was a previous error.  */
      41        5346 :   if (fs == NULL)
      42             :     return -1;
      43             : 
      44        5346 :   int result = 0;
      45        5346 :   switch (fs->cfa_rule)
      46             :     {
      47           0 :     case cfa_undefined:
      48           0 :       *ops = NULL;
      49           0 :       *nops = 0;
      50           0 :       break;
      51             : 
      52        5334 :     case cfa_offset:
      53             :       /* The Dwarf_Op was already fully initialized by execute_cfi.  */
      54        5334 :       *ops = &fs->cfa_data.offset;
      55        5334 :       *nops = 1;
      56        5334 :       break;
      57             : 
      58          12 :     case cfa_expr:
      59             :       /* Parse the expression into internal form.  */
      60          36 :       result = __libdw_intern_expression
      61          12 :         (NULL, fs->cache->other_byte_order,
      62          12 :          fs->cache->e_ident[EI_CLASS] == ELFCLASS32 ? 4 : 8, 4,
      63          12 :          &fs->cache->expr_tree, &fs->cfa_data.expr, false, false,
      64             :          ops, nops, IDX_debug_frame);
      65          12 :       break;
      66             : 
      67           0 :     case cfa_invalid:
      68           0 :       __libdw_seterrno (DWARF_E_INVALID_CFI);
      69           0 :       result = -1;
      70           0 :       break;
      71             : 
      72           0 :     default:
      73           0 :       abort ();
      74             :     }
      75             : 
      76             :   return result;
      77             : }