LCOV - code coverage report
Current view: top level - elfutils/libdw - dwarf_getscopes.c (source / functions) Hit Total Coverage
Test: lcov.out Lines: 52 60 86.7 %
Date: 2013-03-08 Functions: 4 4 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 34 48 70.8 %

           Branch data     Line data    Source code
       1                 :            : /* Return scope DIEs containing PC address.
       2                 :            :    Copyright (C) 2005, 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 <assert.h>
      34                 :            : #include <stdlib.h>
      35                 :            : #include "libdwP.h"
      36                 :            : #include <dwarf.h>
      37                 :            : 
      38                 :            : 
      39                 :            : struct args
      40                 :            : {
      41                 :            :   Dwarf_Addr pc;
      42                 :            :   Dwarf_Die *scopes;
      43                 :            :   unsigned int inlined, nscopes;
      44                 :            :   Dwarf_Die inlined_origin;
      45                 :            : };
      46                 :            : 
      47                 :            : /* Preorder visitor: prune the traversal if this DIE does not contain PC.  */
      48                 :            : static int
      49                 :         12 : pc_match (unsigned int depth, struct Dwarf_Die_Chain *die, void *arg)
      50                 :            : {
      51                 :         12 :   struct args *a = arg;
      52                 :            : 
      53         [ +  + ]:         12 :   if (a->scopes != NULL)
      54                 :          1 :     die->prune = true;
      55                 :            :   else
      56                 :            :     {
      57                 :            :       /* dwarf_haspc returns an error if there are no appropriate attributes.
      58                 :            :          But we use it indiscriminantly instead of presuming which tags can
      59                 :            :          have PC attributes.  So when it fails for that reason, treat it just
      60                 :            :          as a nonmatching return.  */
      61                 :         11 :       int result = INTUSE(dwarf_haspc) (&die->die, a->pc);
      62         [ -  + ]:         11 :       if (result < 0)
      63                 :            :         {
      64                 :          0 :           int error = INTUSE(dwarf_errno) ();
      65         [ #  # ]:          0 :           if (error != DWARF_E_NOERROR && error != DWARF_E_NO_DEBUG_RANGES)
      66                 :            :             {
      67                 :          0 :               __libdw_seterrno (error);
      68                 :          0 :               return -1;
      69                 :            :             }
      70                 :            :           result = 0;
      71                 :            :         }
      72         [ +  + ]:         11 :       if (result == 0)
      73                 :          8 :         die->prune = true;
      74                 :            : 
      75         [ +  + ]:         11 :       if (!die->prune
      76         [ +  + ]:          3 :           && INTUSE (dwarf_tag) (&die->die) == DW_TAG_inlined_subroutine)
      77                 :         12 :         a->inlined = depth;
      78                 :            :     }
      79                 :            : 
      80                 :            :   return 0;
      81                 :            : }
      82                 :            : 
      83                 :            : /* Preorder visitor for second partial traversal after finding a
      84                 :            :    concrete inlined instance.  */
      85                 :            : static int
      86                 :          5 : origin_match (unsigned int depth, struct Dwarf_Die_Chain *die, void *arg)
      87                 :            : {
      88                 :          5 :   struct args *a = arg;
      89                 :            : 
      90         [ +  + ]:          5 :   if (die->die.addr != a->inlined_origin.addr)
      91                 :            :     return 0;
      92                 :            : 
      93                 :            :   /* We have a winner!  This is the abstract definition of the inline
      94                 :            :      function of which A->scopes[A->nscopes - 1] is a concrete instance.
      95                 :            :   */
      96                 :            : 
      97                 :          1 :   unsigned int nscopes = a->nscopes + depth;
      98                 :          1 :   Dwarf_Die *scopes = realloc (a->scopes, nscopes * sizeof scopes[0]);
      99         [ -  + ]:          1 :   if (scopes == NULL)
     100                 :            :     {
     101                 :          0 :       free (a->scopes);
     102                 :          0 :       __libdw_seterrno (DWARF_E_NOMEM);
     103                 :          0 :       return -1;
     104                 :            :     }
     105                 :            : 
     106                 :          1 :   a->scopes = scopes;
     107                 :            :   do
     108                 :            :     {
     109                 :          1 :       die = die->parent;
     110                 :          1 :       scopes[a->nscopes++] = die->die;
     111                 :            :     }
     112         [ -  + ]:          1 :   while (a->nscopes < nscopes);
     113         [ -  + ]:          1 :   assert (die->parent == NULL);
     114                 :          5 :   return a->nscopes;
     115                 :            : }
     116                 :            : 
     117                 :            : /* Postorder visitor: first (innermost) call wins.  */
     118                 :            : static int
     119                 :         12 : pc_record (unsigned int depth, struct Dwarf_Die_Chain *die, void *arg)
     120                 :            : {
     121                 :         12 :   struct args *a = arg;
     122                 :            : 
     123         [ +  + ]:         12 :   if (die->prune)
     124                 :            :     return 0;
     125                 :            : 
     126         [ +  + ]:          3 :   if (a->scopes == NULL)
     127                 :            :     {
     128                 :            :       /* We have hit the innermost DIE that contains the target PC.  */
     129                 :            : 
     130                 :          2 :       a->nscopes = depth + 1 - a->inlined;
     131                 :          2 :       a->scopes = malloc (a->nscopes * sizeof a->scopes[0]);
     132         [ +  - ]:          2 :       if (a->scopes == NULL)
     133                 :            :         {
     134                 :          0 :           __libdw_seterrno (DWARF_E_NOMEM);
     135                 :            :           return -1;
     136                 :            :         }
     137                 :            : 
     138         [ +  + ]:          5 :       for (unsigned int i = 0; i < a->nscopes; ++i)
     139                 :            :         {
     140                 :          3 :           a->scopes[i] = die->die;
     141                 :          3 :           die = die->parent;
     142                 :            :         }
     143                 :            : 
     144         [ +  + ]:          2 :       if (a->inlined == 0)
     145                 :            :         {
     146         [ -  + ]:          1 :           assert (die == NULL);
     147                 :          1 :           return a->nscopes;
     148                 :            :         }
     149                 :            : 
     150                 :            :       /* This is the concrete inlined instance itself.
     151                 :            :          Record its abstract_origin pointer.  */
     152                 :          1 :       Dwarf_Die *const inlinedie = &a->scopes[depth - a->inlined];
     153                 :            : 
     154         [ -  + ]:          1 :       assert (INTUSE (dwarf_tag) (inlinedie) == DW_TAG_inlined_subroutine);
     155                 :            :       Dwarf_Attribute attr_mem;
     156                 :          1 :       Dwarf_Attribute *attr = INTUSE (dwarf_attr) (inlinedie,
     157                 :            :                                                    DW_AT_abstract_origin,
     158                 :            :                                                    &attr_mem);
     159         [ +  - ]:          2 :       if (INTUSE (dwarf_formref_die) (attr, &a->inlined_origin) == NULL)
     160                 :            :         return -1;
     161                 :            :       return 0;
     162                 :            :     }
     163                 :            : 
     164                 :            : 
     165                 :            :   /* We've recorded the scopes back to one that is a concrete inlined
     166                 :            :      instance.  Now return out of the traversal back to the scope
     167                 :            :      containing that instance.  */
     168                 :            : 
     169         [ -  + ]:          1 :   assert (a->inlined);
     170         [ +  - ]:          1 :   if (depth >= a->inlined)
     171                 :            :     /* Not there yet.  */
     172                 :            :     return 0;
     173                 :            : 
     174                 :            :   /* Now we are in a scope that contains the concrete inlined instance.
     175                 :            :      Search it for the inline function's abstract definition.
     176                 :            :      If we don't find it, return to search the containing scope.
     177                 :            :      If we do find it, the nonzero return value will bail us out
     178                 :            :      of the postorder traversal.  */
     179                 :         12 :   return __libdw_visit_scopes (depth, die, &origin_match, NULL, a);
     180                 :            : }
     181                 :            : 
     182                 :            : 
     183                 :            : int
     184                 :          8 : dwarf_getscopes (Dwarf_Die *cudie, Dwarf_Addr pc, Dwarf_Die **scopes)
     185                 :            : {
     186         [ +  + ]:          8 :   if (cudie == NULL)
     187                 :            :     return -1;
     188                 :            : 
     189                 :          2 :   struct Dwarf_Die_Chain cu = { .parent = NULL, .die = *cudie };
     190                 :          2 :   struct args a = { .pc = pc };
     191                 :            : 
     192                 :          2 :   int result = __libdw_visit_scopes (0, &cu, &pc_match, &pc_record, &a);
     193                 :            : 
     194 [ +  + ][ +  - ]:          2 :   if (result == 0 && a.scopes != NULL)
     195                 :          1 :     result = __libdw_visit_scopes (0, &cu, &origin_match, NULL, &a);
     196                 :            : 
     197         [ +  - ]:          2 :   if (result > 0)
     198                 :          8 :     *scopes = a.scopes;
     199                 :            : 
     200                 :            :   return result;
     201                 :            : }

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