Branch data     Line data    Source code

       1                 :            : /* Find source location for PC address in module.
       2                 :            :    Copyright (C) 2005, 2008, 2014 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 "libdwflP.h"
      34                 :            : #include "libdwP.h"
      35                 :            : 
      36                 :            : Dwfl_Line *
      37                 :        268 : dwfl_module_getsrc (Dwfl_Module *mod, Dwarf_Addr addr)
      38                 :            : {
      39                 :        268 :   Dwarf_Addr bias;
      40         [ +  + ]:        268 :   if (INTUSE(dwfl_module_getdwarf) (mod, &bias) == NULL)
      41                 :            :     return NULL;
      42                 :            : 
      43                 :        198 :   struct dwfl_cu *cu;
      44                 :        198 :   Dwfl_Error error = __libdwfl_addrcu (mod, addr, &cu);
      45         [ +  + ]:        198 :   if (likely (error == DWFL_E_NOERROR))
      46                 :        190 :     error = __libdwfl_cu_getsrclines (cu);
      47         [ +  + ]:        198 :   if (likely (error == DWFL_E_NOERROR))
      48                 :            :     {
      49                 :        190 :       Dwarf_Lines *lines = cu->die.cu->lines;
      50                 :        190 :       size_t nlines = lines->nlines;
      51         [ +  - ]:        190 :       if (nlines > 0)
      52                 :            :         {
      53                 :            :           /* This is guaranteed for us by libdw read_srclines.  */
      54         [ -  + ]:        190 :           assert(lines->info[nlines - 1].end_sequence);
      55                 :            : 
      56                 :            :           /* Now we look at the module-relative address.  */
      57                 :        190 :           addr -= bias;
      58                 :            : 
      59                 :            :           /* The lines are sorted by address, so we can use binary search.  */
      60                 :        190 :           size_t l = 0, u = nlines - 1;
      61         [ +  + ]:       1044 :           while (l < u)
      62                 :            :             {
      63                 :        664 :               size_t idx = u - (u - l) / 2;
      64                 :        664 :               Dwarf_Line *line = &lines->info[idx];
      65         [ +  + ]:        664 :               if (addr < line->addr)
      66                 :        356 :                 u = idx - 1;
      67                 :            :               else
      68                 :            :                 l = idx;
      69                 :            :             }
      70                 :            : 
      71                 :            :           /* The last line which is less than or equal to addr is what
      72                 :            :              we want, unless it is the end_sequence which is after the
      73                 :            :              current line sequence.  */
      74                 :        190 :           Dwarf_Line *line = &lines->info[l];
      75   [ +  -  +  - ]:        190 :           if (! line->end_sequence && line->addr <= addr)
      76                 :        190 :             return &cu->lines->idx[l];
      77                 :            :         }
      78                 :            : 
      79                 :            :       error = DWFL_E_ADDR_OUTOFRANGE;
      80                 :            :     }
      81                 :            : 
      82                 :          8 :   __libdwfl_seterrno (error);
      83                 :          8 :   return NULL;
      84                 :            : }
      85                 :            : INTDEF (dwfl_module_getsrc)