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       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                 :      14538 : dwarf_frame_cfa (Dwarf_Frame *fs, Dwarf_Op **ops, size_t *nops)
      39                 :            : {
      40                 :            :   /* Maybe there was a previous error.  */
      41         [ -  + ]:      14538 :   if (fs == NULL)
      42                 :            :     return -1;
      43                 :            : 
      44                 :      14538 :   int result = 0;
      45   [ -  +  +  -  :      14538 :   switch (fs->cfa_rule)
                      - ]
      46                 :            :     {
      47                 :          0 :     case cfa_undefined:
      48                 :          0 :       *ops = NULL;
      49                 :          0 :       *nops = 0;
      50                 :          0 :       break;
      51                 :            : 
      52                 :      14526 :     case cfa_offset:
      53                 :            :       /* The Dwarf_Op was already fully initialized by execute_cfi.  */
      54                 :      14526 :       *ops = &fs->cfa_data.offset;
      55                 :      14526 :       *nops = 1;
      56                 :      14526 :       break;
      57                 :            : 
      58                 :         12 :     case cfa_expr:
      59                 :            :       /* Parse the expression into internal form.  */
      60                 :         24 :       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                 :            : }