Line data    Source code

       1             : /* Peel type aliases and qualifier tags from a type DIE.
       2             :    Copyright (C) 2014, 2015, 2016 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 "libdwP.h"
      34             : #include <dwarf.h>
      35             : #include <string.h>
      36             : 
      37             : 
      38             : int
      39      100585 : dwarf_peel_type (Dwarf_Die *die, Dwarf_Die *result)
      40             : {
      41             :   int tag;
      42             : 
      43             :   /* Ignore previous errors.  */
      44      100585 :   if (die == NULL)
      45             :     return -1;
      46             : 
      47         519 :   *result = *die;
      48         519 :   tag = INTUSE (dwarf_tag) (result);
      49             : 
      50             : /* Stack 8 of all these modifiers, after that it gets silly.  */
      51             : #define MAX_DEPTH (8 * 8)
      52         519 :   int max_depth = MAX_DEPTH;
      53        1164 :   while ((tag == DW_TAG_typedef
      54         645 :           || tag == DW_TAG_const_type
      55         540 :           || tag == DW_TAG_volatile_type
      56         540 :           || tag == DW_TAG_restrict_type
      57         519 :           || tag == DW_TAG_atomic_type
      58         519 :           || tag == DW_TAG_immutable_type
      59         519 :           || tag == DW_TAG_packed_type
      60         519 :           || tag == DW_TAG_shared_type)
      61         126 :         && max_depth-- > 0)
      62             :     {
      63             :       Dwarf_Attribute attr_mem;
      64         126 :       Dwarf_Attribute *attr = INTUSE (dwarf_attr_integrate) (result, DW_AT_type,
      65             :                                                              &attr_mem);
      66         126 :       if (attr == NULL)
      67           0 :         return 1;
      68             : 
      69         126 :       if (INTUSE (dwarf_formref_die) (attr, result) == NULL)
      70             :         return -1;
      71             : 
      72         126 :       tag = INTUSE (dwarf_tag) (result);
      73             :     }
      74             : 
      75         519 :   if (tag == DW_TAG_invalid || max_depth <= 0)
      76             :     return -1;
      77             : 
      78         519 :   return 0;
      79             : }
      80             : INTDEF(dwarf_peel_type)