LCOV - code coverage report
Current view: top level - elfutils/libdw - dwarf_ranges.c (source / functions) Hit Total Coverage
Test: lcov.out Lines: 13 43 30.2 %
Date: 2013-03-08 Functions: 1 2 50.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 9 62 14.5 %

           Branch data     Line data    Source code
       1                 :            : /* Enumerate the PC ranges covered by a DIE.
       2                 :            :    Copyright (C) 2005, 2007, 2009 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 <assert.h>
      36                 :            : 
      37                 :            : /* Read up begin/end pair and increment read pointer.
      38                 :            :     - If it's normal range record, set up `*beginp' and `*endp' and return 0.
      39                 :            :     - If it's base address selection record, set up `*basep' and return 1.
      40                 :            :     - If it's end of rangelist, don't set anything and return 2
      41                 :            :     - If an error occurs, don't set anything and return -1.  */
      42                 :            : internal_function int
      43                 :          0 : __libdw_read_begin_end_pair_inc (Dwarf *dbg, int sec_index,
      44                 :            :                                  unsigned char **addrp, int width,
      45                 :            :                                  Dwarf_Addr *beginp, Dwarf_Addr *endp,
      46                 :            :                                  Dwarf_Addr *basep)
      47                 :            : {
      48                 :          0 :   Dwarf_Addr escape = (width == 8 ? (Elf64_Addr) -1
      49         [ #  # ]:          0 :                        : (Elf64_Addr) (Elf32_Addr) -1);
      50                 :            :   Dwarf_Addr begin;
      51                 :            :   Dwarf_Addr end;
      52                 :            : 
      53                 :          0 :   unsigned char *addr = *addrp;
      54 [ #  # ][ #  # ]:          0 :   bool begin_relocated = READ_AND_RELOCATE (__libdw_relocate_address, begin);
         [ #  # ][ #  # ]
      55 [ #  # ][ #  # ]:          0 :   bool end_relocated = READ_AND_RELOCATE (__libdw_relocate_address, end);
         [ #  # ][ #  # ]
      56                 :          0 :   *addrp = addr;
      57                 :            : 
      58                 :            :   /* Unrelocated escape for begin means base address selection.  */
      59         [ #  # ]:          0 :   if (begin == escape && !begin_relocated)
      60                 :            :     {
      61         [ #  # ]:          0 :       if (unlikely (end == escape))
      62                 :            :         {
      63                 :          0 :           __libdw_seterrno (DWARF_E_INVALID_DWARF);
      64                 :            :           return -1;
      65                 :            :         }
      66                 :            : 
      67         [ #  # ]:          0 :       if (basep != NULL)
      68                 :          0 :         *basep = end;
      69                 :            :       return 1;
      70                 :            :     }
      71                 :            : 
      72                 :            :   /* Unrelocated pair of zeroes means end of range list.  */
      73 [ #  # ][ #  # ]:          0 :   if (begin == 0 && end == 0 && !begin_relocated && !end_relocated)
      74                 :            :     return 2;
      75                 :            : 
      76                 :            :   /* Don't check for begin_relocated == end_relocated.  Serve the data
      77                 :            :      to the client even though it may be buggy.  */
      78                 :          0 :   *beginp = begin;
      79                 :          0 :   *endp = end;
      80                 :            : 
      81                 :            :   return 0;
      82                 :            : }
      83                 :            : 
      84                 :            : ptrdiff_t
      85                 :         46 : dwarf_ranges (Dwarf_Die *die, ptrdiff_t offset, Dwarf_Addr *basep,
      86                 :            :               Dwarf_Addr *startp, Dwarf_Addr *endp)
      87                 :            : {
      88         [ +  - ]:         46 :   if (die == NULL)
      89                 :            :     return -1;
      90                 :            : 
      91         [ +  - ]:         46 :   if (offset == 0
      92                 :            :       /* Usually there is a single contiguous range.  */
      93         [ +  + ]:         46 :       && INTUSE(dwarf_highpc) (die, endp) == 0
      94         [ -  + ]:         38 :       && INTUSE(dwarf_lowpc) (die, startp) == 0)
      95                 :            :     /* A offset into .debug_ranges will never be 1, it must be at least a
      96                 :            :        multiple of 4.  So we can return 1 as a special case value to mark
      97                 :            :        there are no ranges to look for on the next call.  */
      98                 :            :     return 1;
      99                 :            : 
     100         [ +  - ]:          8 :   if (offset == 1)
     101                 :            :     return 0;
     102                 :            : 
     103                 :            :   /* We have to look for a noncontiguous range.  */
     104                 :            : 
     105                 :          8 :   const Elf_Data *d = die->cu->dbg->sectiondata[IDX_debug_ranges];
     106         [ -  + ]:          8 :   if (d == NULL && offset != 0)
     107                 :            :     {
     108                 :          0 :       __libdw_seterrno (DWARF_E_NO_DEBUG_RANGES);
     109                 :            :       return -1;
     110                 :            :     }
     111                 :            : 
     112                 :            :   unsigned char *readp;
     113                 :            :   unsigned char *readendp;
     114         [ +  - ]:          8 :   if (offset == 0)
     115                 :            :     {
     116                 :            :       Dwarf_Attribute attr_mem;
     117                 :          8 :       Dwarf_Attribute *attr = INTUSE(dwarf_attr) (die, DW_AT_ranges,
     118                 :            :                                                   &attr_mem);
     119         [ -  + ]:          8 :       if (attr == NULL)
     120                 :            :         /* No PC attributes in this DIE at all, so an empty range list.  */
     121                 :            :         return 0;
     122                 :            : 
     123                 :            :       Dwarf_Word start_offset;
     124         [ #  # ]:          0 :       if ((readp = __libdw_formptr (attr, IDX_debug_ranges,
     125                 :            :                                     DWARF_E_NO_DEBUG_RANGES,
     126                 :            :                                     &readendp, &start_offset)) == NULL)
     127                 :            :         return -1;
     128                 :            : 
     129                 :          0 :       offset = start_offset;
     130                 :            :       assert ((Dwarf_Word) offset == start_offset);
     131                 :            : 
     132                 :            :       /* Fetch the CU's base address.  */
     133         [ #  # ]:          0 :       Dwarf_Die cudie = CUDIE (attr->cu);
     134                 :            : 
     135                 :            :       /* Find the base address of the compilation unit.  It will
     136                 :            :          normally be specified by DW_AT_low_pc.  In DWARF-3 draft 4,
     137                 :            :          the base address could be overridden by DW_AT_entry_pc.  It's
     138                 :            :          been removed, but GCC emits DW_AT_entry_pc and not DW_AT_lowpc
     139                 :            :          for compilation units with discontinuous ranges.  */
     140         [ #  # ]:          0 :       if (unlikely (INTUSE(dwarf_lowpc) (&cudie, basep) != 0)
     141         [ #  # ]:          0 :           && INTUSE(dwarf_formaddr) (INTUSE(dwarf_attr) (&cudie,
     142                 :            :                                                          DW_AT_entry_pc,
     143                 :            :                                                          &attr_mem),
     144                 :            :                                      basep) != 0)
     145                 :            :         {
     146         [ #  # ]:          0 :           if (INTUSE(dwarf_errno) () == 0)
     147                 :            :             {
     148                 :            :             invalid:
     149                 :          8 :               __libdw_seterrno (DWARF_E_INVALID_DWARF);
     150                 :            :             }
     151                 :            :           return -1;
     152                 :            :         }
     153                 :            :     }
     154                 :            :   else
     155                 :            :     {
     156         [ #  # ]:          0 :       if (__libdw_offset_in_section (die->cu->dbg,
     157                 :            :                                      IDX_debug_ranges, offset, 1))
     158                 :            :         return -1l;
     159                 :            : 
     160                 :          0 :       readp = d->d_buf + offset;
     161                 :          0 :       readendp = d->d_buf + d->d_size;
     162                 :            :     }
     163                 :            : 
     164                 :            :  next:
     165         [ #  # ]:          0 :   if (readendp - readp < die->cu->address_size * 2)
     166                 :            :     goto invalid;
     167                 :            : 
     168                 :            :   Dwarf_Addr begin;
     169                 :            :   Dwarf_Addr end;
     170                 :            : 
     171   [ #  #  #  # ]:          0 :   switch (__libdw_read_begin_end_pair_inc (die->cu->dbg, IDX_debug_ranges,
     172                 :            :                                            &readp, die->cu->address_size,
     173                 :            :                                            &begin, &end, basep))
     174                 :            :     {
     175                 :            :     case 0:
     176                 :            :       break;
     177                 :            :     case 1:
     178                 :            :       goto next;
     179                 :            :     case 2:
     180                 :            :       return 0;
     181                 :            :     default:
     182                 :            :       return -1l;
     183                 :            :     }
     184                 :            : 
     185                 :            :   /* We have an address range entry.  */
     186                 :          0 :   *startp = *basep + begin;
     187                 :          0 :   *endp = *basep + end;
     188                 :         46 :   return readp - (unsigned char *) d->d_buf;
     189                 :            : }
     190                 :          0 : INTDEF (dwarf_ranges)

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