Branch data     Line data    Source code

       1                 :            : /* Find line information for given file/line/column triple.
       2                 :            :    Copyright (C) 2005-2009 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            :    Written by Ulrich Drepper <drepper@redhat.com>, 2005.
       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 <limits.h>
      36                 :            : #include <stdlib.h>
      37                 :            : #include <string.h>
      38                 :            : 
      39                 :            : #include "libdwP.h"
      40                 :            : 
      41                 :            : 
      42                 :            : int
      43                 :          0 : dwarf_getsrc_file (Dwarf *dbg, const char *fname, int lineno, int column,
      44                 :            :                    Dwarf_Line ***srcsp, size_t *nsrcs)
      45                 :            : {
      46         [ #  # ]:          0 :   if (dbg == NULL)
      47                 :            :     return -1;
      48                 :            : 
      49                 :          0 :   bool is_basename = strchr (fname, '/') == NULL;
      50                 :            : 
      51         [ #  # ]:          0 :   size_t max_match = *nsrcs ?: ~0u;
      52                 :          0 :   size_t act_match = *nsrcs;
      53                 :          0 :   size_t cur_match = 0;
      54         [ #  # ]:          0 :   Dwarf_Line **match = *nsrcs == 0 ? NULL : *srcsp;
      55                 :            : 
      56                 :            :   size_t cuhl;
      57                 :            :   Dwarf_Off noff;
      58                 :            :   for (Dwarf_Off off = 0;
      59         [ #  # ]:          0 :        INTUSE(dwarf_nextcu) (dbg, off, &noff, &cuhl, NULL, NULL, NULL) == 0;
      60                 :          0 :        off = noff)
      61                 :            :     {
      62                 :          0 :       Dwarf_Die cudie_mem;
      63                 :          0 :       Dwarf_Die *cudie = INTUSE(dwarf_offdie) (dbg, off + cuhl, &cudie_mem);
      64         [ #  # ]:          0 :       if (cudie == NULL)
      65                 :          0 :         continue;
      66                 :            : 
      67                 :            :       /* Get the line number information for this file.  */
      68                 :          0 :       Dwarf_Lines *lines;
      69                 :          0 :       size_t nlines;
      70         [ #  # ]:          0 :       if (INTUSE(dwarf_getsrclines) (cudie, &lines, &nlines) != 0)
      71                 :            :         {
      72                 :            :           /* Ignore a CU that just has no DW_AT_stmt_list at all.  */
      73                 :          0 :           int error = INTUSE(dwarf_errno) ();
      74         [ #  # ]:          0 :           if (error == 0)
      75                 :          0 :             continue;
      76                 :          0 :           __libdw_seterrno (error);
      77                 :          0 :           return -1;
      78                 :            :         }
      79                 :            : 
      80                 :            :       /* Search through all the line number records for a matching
      81                 :            :          file and line/column number.  If any of the numbers is zero,
      82                 :            :          no match is performed.  */
      83                 :            :       unsigned int lastfile = UINT_MAX;
      84                 :            :       bool lastmatch = false;
      85         [ #  # ]:          0 :       for (size_t cnt = 0; cnt < nlines; ++cnt)
      86                 :            :         {
      87                 :          0 :           Dwarf_Line *line = &lines->info[cnt];
      88                 :            : 
      89         [ #  # ]:          0 :           if (lastfile != line->file)
      90                 :            :             {
      91                 :          0 :               lastfile = line->file;
      92         [ #  # ]:          0 :               if (lastfile >= line->files->nfiles)
      93                 :            :                 {
      94                 :          0 :                   __libdw_seterrno (DWARF_E_INVALID_DWARF);
      95                 :          0 :                   return -1;
      96                 :            :                 }
      97                 :            : 
      98                 :            :               /* Match the name with the name the user provided.  */
      99                 :          0 :               const char *fname2 = line->files->info[lastfile].name;
     100         [ #  # ]:          0 :               if (is_basename)
     101                 :          0 :                 lastmatch = strcmp (xbasename (fname2), fname) == 0;
     102                 :            :               else
     103                 :          0 :                 lastmatch = strcmp (fname2, fname) == 0;
     104                 :            :             }
     105         [ #  # ]:          0 :           if (!lastmatch)
     106                 :          0 :             continue;
     107                 :            : 
     108                 :            :           /* See whether line and possibly column match.  */
     109         [ #  # ]:          0 :           if (lineno != 0
     110         [ #  # ]:          0 :               && (lineno > line->line
     111   [ #  #  #  # ]:          0 :                   || (column != 0 && column > line->column)))
     112                 :            :             /* Cannot match.  */
     113                 :          0 :             continue;
     114                 :            : 
     115                 :            :           /* Determine whether this is the best match so far.  */
     116                 :            :           size_t inner;
     117         [ #  # ]:          0 :           for (inner = 0; inner < cur_match; ++inner)
     118         [ #  # ]:          0 :             if (match[inner]->files == line->files
     119         [ #  # ]:          0 :                 && match[inner]->file == line->file)
     120                 :            :               break;
     121         [ #  # ]:          0 :           if (inner < cur_match
     122         [ #  # ]:          0 :               && (match[inner]->line != line->line
     123         [ #  # ]:          0 :                   || match[inner]->line != lineno
     124         [ #  # ]:          0 :                   || (column != 0
     125         [ #  # ]:          0 :                       && (match[inner]->column != line->column
     126         [ #  # ]:          0 :                           || match[inner]->column != column))))
     127                 :            :             {
     128                 :            :               /* We know about this file already.  If this is a better
     129                 :            :                  match for the line number, use it.  */
     130         [ #  # ]:          0 :               if (match[inner]->line >= line->line
     131         [ #  # ]:          0 :                   && (match[inner]->line != line->line
     132         [ #  # ]:          0 :                       || match[inner]->column >= line->column))
     133                 :            :                 /*  Use the new line.  Otherwise the old one.  */
     134                 :          0 :                 match[inner] = line;
     135                 :          0 :               continue;
     136                 :            :             }
     137                 :            : 
     138         [ #  # ]:          0 :           if (cur_match < max_match)
     139                 :            :             {
     140         [ #  # ]:          0 :               if (cur_match == act_match)
     141                 :            :                 {
     142                 :            :                   /* Enlarge the array for the results.  */
     143                 :          0 :                   act_match += 10;
     144                 :          0 :                   Dwarf_Line **newp = realloc (match,
     145                 :            :                                                act_match
     146                 :            :                                                * sizeof (Dwarf_Line *));
     147         [ #  # ]:          0 :                   if (newp == NULL)
     148                 :            :                     {
     149                 :          0 :                       free (match);
     150                 :          0 :                       __libdw_seterrno (DWARF_E_NOMEM);
     151                 :          0 :                       return -1;
     152                 :            :                     }
     153                 :            :                   match = newp;
     154                 :            :                 }
     155                 :            : 
     156                 :          0 :               match[cur_match++] = line;
     157                 :            :             }
     158                 :            :         }
     159                 :            : 
     160                 :            :       /* If we managed to find as many matches as the user requested
     161                 :            :          already, there is no need to go on to the next CU.  */
     162         [ #  # ]:          0 :       if (cur_match == max_match)
     163                 :            :         break;
     164                 :            :     }
     165                 :            : 
     166         [ #  # ]:          0 :   if (cur_match > 0)
     167                 :            :     {
     168   [ #  #  #  # ]:          0 :       assert (*nsrcs == 0 || *srcsp == match);
     169                 :            : 
     170                 :          0 :       *nsrcs = cur_match;
     171                 :          0 :       *srcsp = match;
     172                 :            : 
     173                 :          0 :       return 0;
     174                 :            :     }
     175                 :            : 
     176                 :          0 :   __libdw_seterrno (DWARF_E_NO_MATCH);
     177                 :          0 :   return -1;
     178                 :            : }