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       1                 :            : /* Find line information for address.
       2                 :            :    Copyright (C) 2004, 2005, 2014 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            :    Written by Ulrich Drepper <drepper@redhat.com>, 2004.
       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 "libdwP.h"
      35                 :            : #include <assert.h>
      36                 :            : 
      37                 :            : 
      38                 :            : Dwarf_Line *
      39                 :         64 : dwarf_getsrc_die (Dwarf_Die *cudie, Dwarf_Addr addr)
      40                 :            : {
      41                 :            :   Dwarf_Lines *lines;
      42                 :            :   size_t nlines;
      43                 :            : 
      44         [ -  + ]:         64 :   if (INTUSE(dwarf_getsrclines) (cudie, &lines, &nlines) != 0)
      45                 :          0 :     return NULL;
      46                 :            : 
      47                 :            :   /* The lines are sorted by address, so we can use binary search.  */
      48         [ +  - ]:         64 :   if (nlines > 0)
      49                 :            :     {
      50                 :         64 :       size_t l = 0, u = nlines - 1;
      51         [ +  + ]:        300 :       while (l < u)
      52                 :            :         {
      53                 :        236 :           size_t idx = u - (u - l) / 2;
      54                 :        236 :           Dwarf_Line *line = &lines->info[idx];
      55         [ +  + ]:        236 :           if (addr < line->addr)
      56                 :        112 :             u = idx - 1;
      57                 :            :           else
      58                 :        124 :             l = idx;
      59                 :            :         }
      60                 :            : 
      61                 :            :       /* This is guaranteed for us by libdw read_srclines.  */
      62         [ -  + ]:         64 :       assert (lines->info[nlines - 1].end_sequence);
      63                 :            : 
      64                 :            :       /* The last line which is less than or equal to addr is what we
      65                 :            :          want, unless it is the end_sequence which is after the
      66                 :            :          current line sequence.  */
      67                 :         64 :       Dwarf_Line *line = &lines->info[l];
      68   [ +  -  +  - ]:         64 :       if (! line->end_sequence && line->addr <= addr)
      69                 :         64 :         return &lines->info[l];
      70                 :            :     }
      71                 :            : 
      72                 :          0 :   __libdw_seterrno (DWARF_E_ADDR_OUTOFRANGE);
      73                 :          0 :   return NULL;
      74                 :            : }