LCOV - code coverage report
Current view: top level - elfutils/libdw - dwarf_getabbrev.c (source / functions) Hit Total Coverage
Test: lcov.out Lines: 30 34 88.2 %
Date: 2013-03-08 Functions: 2 2 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 25 34 73.5 %

           Branch data     Line data    Source code
       1                 :            : /* Get abbreviation at given offset.
       2                 :            :    Copyright (C) 2003, 2004, 2005, 2006 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            :    Written by Ulrich Drepper <drepper@redhat.com>, 2003.
       5                 :            : 
       6                 :            :    This file is free software; you can redistribute it and/or modify
       7                 :            :    it under the terms of either
       8                 :            : 
       9                 :            :      * the GNU Lesser General Public License as published by the Free
      10                 :            :        Software Foundation; either version 3 of the License, or (at
      11                 :            :        your option) any later version
      12                 :            : 
      13                 :            :    or
      14                 :            : 
      15                 :            :      * the GNU General Public License as published by the Free
      16                 :            :        Software Foundation; either version 2 of the License, or (at
      17                 :            :        your option) any later version
      18                 :            : 
      19                 :            :    or both in parallel, as here.
      20                 :            : 
      21                 :            :    elfutils is distributed in the hope that it will be useful, but
      22                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      23                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24                 :            :    General Public License for more details.
      25                 :            : 
      26                 :            :    You should have received copies of the GNU General Public License and
      27                 :            :    the GNU Lesser General Public License along with this program.  If
      28                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      29                 :            : 
      30                 :            : #ifdef HAVE_CONFIG_H
      31                 :            : # include <config.h>
      32                 :            : #endif
      33                 :            : 
      34                 :            : #include <assert.h>
      35                 :            : #include <dwarf.h>
      36                 :            : #include "libdwP.h"
      37                 :            : 
      38                 :            : 
      39                 :            : Dwarf_Abbrev *
      40                 :            : internal_function
      41                 :     961301 : __libdw_getabbrev (dbg, cu, offset, lengthp, result)
      42                 :            :      Dwarf *dbg;
      43                 :            :      struct Dwarf_CU *cu;
      44                 :            :      Dwarf_Off offset;
      45                 :            :      size_t *lengthp;
      46                 :            :      Dwarf_Abbrev *result;
      47                 :            : {
      48                 :            :   /* Don't fail if there is not .debug_abbrev section.  */
      49         [ +  - ]:     961301 :   if (dbg->sectiondata[IDX_debug_abbrev] == NULL)
      50                 :            :     return NULL;
      51                 :            : 
      52         [ -  + ]:     961301 :   if (offset >= dbg->sectiondata[IDX_debug_abbrev]->d_size)
      53                 :            :     {
      54                 :          0 :       __libdw_seterrno (DWARF_E_INVALID_OFFSET);
      55                 :            :       return NULL;
      56                 :            :     }
      57                 :            : 
      58                 :     961301 :   const unsigned char *abbrevp
      59                 :     961301 :     = (unsigned char *) dbg->sectiondata[IDX_debug_abbrev]->d_buf + offset;
      60                 :            : 
      61         [ +  + ]:     961301 :   if (*abbrevp == '\0')
      62                 :            :     /* We are past the last entry.  */
      63                 :            :     return DWARF_END_ABBREV;
      64                 :            : 
      65                 :            :   /* 7.5.3 Abbreviations Tables
      66                 :            : 
      67                 :            :      [...] Each declaration begins with an unsigned LEB128 number
      68                 :            :      representing the abbreviation code itself.  [...]  The
      69                 :            :      abbreviation code is followed by another unsigned LEB128
      70                 :            :      number that encodes the entry's tag.  [...]
      71                 :            : 
      72                 :            :      [...] Following the tag encoding is a 1-byte value that
      73                 :            :      determines whether a debugging information entry using this
      74                 :            :      abbreviation has child entries or not. [...]
      75                 :            : 
      76                 :            :      [...] Finally, the child encoding is followed by a series of
      77                 :            :      attribute specifications. Each attribute specification
      78                 :            :      consists of two parts. The first part is an unsigned LEB128
      79                 :            :      number representing the attribute's name. The second part is
      80                 :            :      an unsigned LEB128 number representing the attribute's form.  */
      81                 :     959950 :   const unsigned char *start_abbrevp = abbrevp;
      82                 :            :   unsigned int code;
      83         [ +  + ]:     959950 :   get_uleb128 (code, abbrevp);
      84                 :            : 
      85                 :            :   /* Check whether this code is already in the hash table.  */
      86                 :     959950 :   bool foundit = false;
      87                 :     959950 :   Dwarf_Abbrev *abb = NULL;
      88         [ +  + ]:     959950 :   if (cu == NULL
      89         [ +  - ]:     895529 :       || (abb = Dwarf_Abbrev_Hash_find (&cu->abbrev_hash, code, NULL)) == NULL)
      90                 :            :     {
      91         [ +  + ]:     959950 :       if (result == NULL)
      92         [ +  + ]:     895529 :         abb = libdw_typed_alloc (dbg, Dwarf_Abbrev);
      93                 :            :       else
      94                 :            :         abb = result;
      95                 :            :     }
      96                 :            :   else
      97                 :            :     {
      98                 :          0 :       foundit = true;
      99                 :            : 
     100         [ #  # ]:          0 :       assert (abb->offset == offset);
     101                 :            : 
     102                 :            :       /* If the caller doesn't need the length we are done.  */
     103         [ #  # ]:          0 :       if (lengthp == NULL)
     104                 :            :         goto out;
     105                 :            :     }
     106                 :            : 
     107                 :            :   /* If there is already a value in the hash table we are going to
     108                 :            :      overwrite its content.  This must not be a problem, since the
     109                 :            :      content better be the same.  */
     110                 :     959950 :   abb->code = code;
     111         [ +  + ]:     959950 :   get_uleb128 (abb->tag, abbrevp);
     112                 :     959950 :   abb->has_children = *abbrevp++ == DW_CHILDREN_yes;
     113                 :     959950 :   abb->attrp = (unsigned char *) abbrevp;
     114                 :     959950 :   abb->offset = offset;
     115                 :            : 
     116                 :            :   /* Skip over all the attributes and count them while doing so.  */
     117                 :     959950 :   abb->attrcnt = 0;
     118                 :            :   unsigned int attrname;
     119                 :            :   unsigned int attrform;
     120                 :            :   do
     121                 :            :     {
     122         [ +  + ]:    4835546 :       get_uleb128 (attrname, abbrevp);
     123         [ +  + ]:    4835546 :       get_uleb128 (attrform, abbrevp);
     124                 :            :     }
     125 [ +  + ][ +  - ]:    4835546 :   while (attrname != 0 && attrform != 0 && ++abb->attrcnt);
     126                 :            : 
     127                 :            :   /* Return the length to the caller if she asked for it.  */
     128         [ +  - ]:     959950 :   if (lengthp != NULL)
     129                 :     959950 :     *lengthp = abbrevp - start_abbrevp;
     130                 :            : 
     131                 :            :   /* Add the entry to the hash table.  */
     132         [ +  + ]:     959950 :   if (cu != NULL && ! foundit)
     133                 :     961301 :     (void) Dwarf_Abbrev_Hash_insert (&cu->abbrev_hash, abb->code, abb);
     134                 :            : 
     135                 :            :  out:
     136                 :            :   return abb;
     137                 :            : }
     138                 :            : 
     139                 :            : 
     140                 :            : Dwarf_Abbrev *
     141                 :         69 : dwarf_getabbrev (die, offset, lengthp)
     142                 :            :      Dwarf_Die *die;
     143                 :            :      Dwarf_Off offset;
     144                 :            :      size_t *lengthp;
     145                 :            : {
     146                 :         69 :   return __libdw_getabbrev (die->cu->dbg, die->cu,
     147                 :         69 :                             die->cu->orig_abbrev_offset + offset, lengthp,
     148                 :            :                             NULL);
     149                 :            : }

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