LCOV - code coverage report
Current view: top level - elfutils/libdw - libdw_visit_scopes.c (source / functions) Hit Total Coverage
Test: lcov.out Lines: 23 30 76.7 %
Date: 2012-10-31 Functions: 3 3 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 21 33 63.6 %

           Branch data     Line data    Source code
       1                 :            : /* Helper functions to descend DWARF scope trees.
       2                 :            :    Copyright (C) 2005,2006,2007 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                 :            : enum die_class { ignore, match, match_inline, walk, imported };
      37                 :            : 
      38                 :            : static enum die_class
      39                 :         12 : classify_die (Dwarf_Die *die)
      40                 :            : {
      41   [ +  +  -  -  :         12 :   switch (INTUSE(dwarf_tag) (die))
                   +  - ]
      42                 :            :     {
      43                 :            :       /* DIEs with addresses we can try to match.  */
      44                 :            :     case DW_TAG_compile_unit:
      45                 :            :     case DW_TAG_module:
      46                 :            :     case DW_TAG_lexical_block:
      47                 :            :     case DW_TAG_with_stmt:
      48                 :            :     case DW_TAG_catch_block:
      49                 :            :     case DW_TAG_try_block:
      50                 :            :     case DW_TAG_entry_point:
      51                 :            :       return match;
      52                 :            :     case DW_TAG_inlined_subroutine:
      53                 :          2 :       return match_inline;
      54                 :            :     case DW_TAG_subprogram:
      55                 :            :       /* This might be a concrete out-of-line instance of an inline, in
      56                 :            :          which case it is not guaranteed to be owned by the right scope and
      57                 :            :          we will search for its origin as for DW_TAG_inlined_subroutine.  */
      58         [ +  + ]:          3 :       return (INTUSE(dwarf_hasattr) (die, DW_AT_abstract_origin)
      59                 :            :               ? match_inline : match);
      60                 :            : 
      61                 :            :       /* DIEs without addresses that can own DIEs with addresses.  */
      62                 :            :     case DW_TAG_namespace:
      63                 :            :     case DW_TAG_class_type:
      64                 :            :     case DW_TAG_structure_type:
      65                 :          0 :       return walk;
      66                 :            : 
      67                 :            :       /* Special indirection required.  */
      68                 :            :     case DW_TAG_imported_unit:
      69                 :          0 :       return imported;
      70                 :            : 
      71                 :            :       /* Other DIEs we have no reason to descend.  */
      72                 :            :     default:
      73                 :            :       break;
      74                 :            :     }
      75                 :         12 :   return ignore;
      76                 :            : }
      77                 :            : 
      78                 :            : int
      79                 :         10 : __libdw_visit_scopes (depth, root, previsit, postvisit, arg)
      80                 :            :      unsigned int depth;
      81                 :            :      struct Dwarf_Die_Chain *root;
      82                 :            :      int (*previsit) (unsigned int depth, struct Dwarf_Die_Chain *, void *);
      83                 :            :      int (*postvisit) (unsigned int depth, struct Dwarf_Die_Chain *, void *);
      84                 :            :      void *arg;
      85                 :            : {
      86                 :            :   struct Dwarf_Die_Chain child;
      87                 :            : 
      88                 :         10 :   child.parent = root;
      89         [ +  - ]:         10 :   if (INTUSE(dwarf_child) (&root->die, &child.die) != 0)
      90                 :            :     return -1;
      91                 :            : 
      92                 :          5 :   inline int recurse (void)
      93                 :            :     {
      94                 :          5 :       return __libdw_visit_scopes (depth + 1, &child,
      95                 :            :                                    previsit, postvisit, arg);
      96                 :            :     }
      97                 :            : 
      98                 :            :   do
      99                 :            :     {
     100                 :         23 :       child.prune = false;
     101                 :            : 
     102         [ +  - ]:         23 :       if (previsit != NULL)
     103                 :            :         {
     104                 :         23 :           int result = (*previsit) (depth + 1, &child, arg);
     105         [ +  + ]:         23 :           if (result != DWARF_CB_OK)
     106                 :            :             return result;
     107                 :            :         }
     108                 :            : 
     109         [ +  + ]:         21 :       if (!child.prune)
     110      [ +  -  + ]:         12 :         switch (classify_die (&child.die))
     111                 :            :           {
     112                 :            :           case match:
     113                 :            :           case match_inline:
     114                 :            :           case walk:
     115         [ +  - ]:          5 :             if (INTUSE(dwarf_haschildren) (&child.die))
     116                 :            :               {
     117                 :          5 :                 int result = recurse ();
     118         [ +  - ]:          5 :                 if (result != DWARF_CB_OK)
     119                 :            :                   return result;
     120                 :            :               }
     121                 :            :             break;
     122                 :            : 
     123                 :            :           case imported:
     124                 :            :             {
     125                 :            :               /* This imports another compilation unit to appear
     126                 :            :                  as part of this one, inside the current scope.
     127                 :            :                  Recurse to search the referenced unit, but without
     128                 :            :                  recording it as an inner scoping level.  */
     129                 :            : 
     130                 :            :               Dwarf_Attribute attr_mem;
     131                 :          0 :               Dwarf_Attribute *attr = INTUSE(dwarf_attr) (&child.die,
     132                 :            :                                                           DW_AT_import,
     133                 :            :                                                           &attr_mem);
     134         [ #  # ]:          0 :               if (INTUSE(dwarf_formref_die) (attr, &child.die) != NULL)
     135                 :            :                 {
     136                 :          0 :                   int result = recurse ();
     137         [ #  # ]:          0 :                   if (result != DWARF_CB_OK)
     138                 :            :                     return result;
     139                 :            :                 }
     140                 :            :             }
     141                 :          0 :             break;
     142                 :            : 
     143                 :            :           default:
     144                 :            :             break;
     145                 :            :           }
     146                 :            : 
     147         [ +  + ]:         21 :       if (postvisit != NULL)
     148                 :            :         {
     149                 :         12 :           int result = (*postvisit) (depth + 1, &child, arg);
     150         [ +  + ]:         12 :           if (result != DWARF_CB_OK)
     151                 :            :             return result;
     152                 :            :         }
     153                 :            :     }
     154         [ +  + ]:         23 :   while (INTUSE(dwarf_siblingof) (&child.die, &child.die) == 0);
     155                 :            : 
     156                 :            :   return 0;
     157                 :            : }

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