Branch data     Line data    Source code

       1                 :            : /* Return associated attribute for DW_OP_GNU_implicit_pointer.
       2                 :            :    Copyright (C) 2010, 2017 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                 :            : 
      36                 :            : 
      37                 :            : static unsigned char empty_exprloc = 0;
      38                 :            : static Dwarf_CU empty_cu = { .startp = &empty_exprloc,
      39                 :            :                              .endp = &empty_exprloc + 1 };
      40                 :            : 
      41                 :            : void
      42                 :            : internal_function
      43                 :         12 : __libdw_empty_loc_attr (Dwarf_Attribute *attr)
      44                 :            : {
      45                 :         12 :   attr->code = DW_AT_location;
      46                 :         12 :   attr->form = DW_FORM_exprloc;
      47                 :         12 :   attr->valp = &empty_exprloc;
      48                 :         12 :   attr->cu = &empty_cu;
      49                 :         12 : }
      50                 :            : 
      51                 :            : int
      52                 :       4147 : dwarf_getlocation_implicit_pointer (Dwarf_Attribute *attr, const Dwarf_Op *op,
      53                 :            :                                     Dwarf_Attribute *result)
      54                 :            : {
      55         [ +  - ]:       4147 :   if (attr == NULL)
      56                 :            :     return -1;
      57                 :            : 
      58         [ -  + ]:       4147 :   if (unlikely (op->atom != DW_OP_implicit_pointer
      59                 :            :                 && op->atom != DW_OP_GNU_implicit_pointer))
      60                 :            :     {
      61                 :          0 :       __libdw_seterrno (DWARF_E_INVALID_ACCESS);
      62                 :          0 :       return -1;
      63                 :            :     }
      64                 :            : 
      65                 :       4147 :   Dwarf_Die die;
      66         [ +  - ]:       4147 :   if (__libdw_offdie (attr->cu->dbg, op->number, &die,
      67   [ +  -  +  - ]:       4147 :                       ISV4TU(attr->cu)) == NULL)
      68                 :            :     return -1;
      69                 :            : 
      70         [ +  + ]:       4147 :   if (INTUSE(dwarf_attr) (&die, DW_AT_location, result) == NULL
      71         [ +  - ]:          6 :       && INTUSE(dwarf_attr) (&die, DW_AT_const_value, result) == NULL)
      72                 :            :     {
      73                 :          6 :       __libdw_empty_loc_attr (result);
      74                 :          6 :       return 0;
      75                 :            :     }
      76                 :            : 
      77                 :            :   return 0;
      78                 :            : }