LCOV - code coverage report
Current view: top level - libdwfl - dwfl_module_getsrc_file.c (source / functions) Hit Total Coverage
Test: elfutils-0.190 Lines: 57 69 82.6 %
Date: 2024-02-15 23:48:53 Functions: 2 2 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 42 70 60.0 %

           Branch data     Line data    Source code
       1                 :            : /* Find matching source locations in a module.
       2                 :            :    Copyright (C) 2005 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                 :            : 
      37                 :            : static inline const char *
      38                 :       3762 : dwfl_dwarf_line_file (const Dwarf_Line *line)
      39                 :            : {
      40                 :       3762 :   return line->files->info[line->file].name;
      41                 :            : }
      42                 :            : 
      43                 :            : static inline Dwarf_Line *
      44                 :       2526 : dwfl_line (const Dwfl_Line *line)
      45                 :            : {
      46                 :       3804 :   return &dwfl_linecu (line)->die.cu->lines->info[line->idx];
      47                 :            : }
      48                 :            : 
      49                 :            : static inline const char *
      50                 :       1262 : dwfl_line_file (const Dwfl_Line *line)
      51                 :            : {
      52                 :       1262 :   return dwfl_dwarf_line_file (dwfl_line (line));
      53                 :            : }
      54                 :            : 
      55                 :            : int
      56                 :         20 : dwfl_module_getsrc_file (Dwfl_Module *mod,
      57                 :            :                          const char *fname, int lineno, int column,
      58                 :            :                          Dwfl_Line ***srcsp, size_t *nsrcs)
      59                 :            : {
      60         [ -  + ]:         20 :   if (mod == NULL)
      61                 :            :     return -1;
      62                 :            : 
      63         [ -  + ]:         20 :   if (mod->dw == NULL)
      64                 :            :     {
      65                 :          0 :       Dwarf_Addr bias;
      66         [ #  # ]:          0 :       if (INTUSE(dwfl_module_getdwarf) (mod, &bias) == NULL)
      67                 :          0 :         return -1;
      68                 :            :     }
      69                 :            : 
      70                 :         20 :   bool is_basename = strchr (fname, '/') == NULL;
      71                 :            : 
      72         [ +  - ]:         20 :   size_t max_match = *nsrcs ?: ~0u;
      73                 :         20 :   size_t act_match = *nsrcs;
      74                 :         20 :   size_t cur_match = 0;
      75         [ -  + ]:         20 :   Dwfl_Line **match = *nsrcs == 0 ? NULL : *srcsp;
      76                 :            : 
      77                 :         20 :   struct dwfl_cu *cu = NULL;
      78                 :         20 :   Dwfl_Error error;
      79                 :         20 :   while ((error = __libdwfl_nextcu (mod, cu, &cu)) == DWFL_E_NOERROR
      80         [ +  + ]:         60 :          && cu != NULL
      81   [ +  -  +  - ]:        100 :          && (error = __libdwfl_cu_getsrclines (cu)) == DWFL_E_NOERROR)
      82                 :            :     {
      83                 :            :       /* Search through all the line number records for a matching
      84                 :            :          file and line/column number.  If any of the numbers is zero,
      85                 :            :          no match is performed.  */
      86                 :            :       const char *lastfile = NULL;
      87                 :            :       bool lastmatch = false;
      88         [ +  + ]:       2540 :       for (size_t cnt = 0; cnt < cu->die.cu->lines->nlines; ++cnt)
      89                 :            :         {
      90                 :       2500 :           Dwarf_Line *line = &cu->die.cu->lines->info[cnt];
      91                 :            : 
      92         [ -  + ]:       2500 :           if (unlikely (line->file >= line->files->nfiles))
      93                 :            :             {
      94         [ #  # ]:          0 :               if (*nsrcs == 0)
      95                 :          0 :                 free (match);
      96                 :          0 :               __libdwfl_seterrno (DWFL_E (LIBDW, DWARF_E_INVALID_DWARF));
      97                 :          0 :               return -1;
      98                 :            :             }
      99                 :            :           else
     100                 :            :             {
     101                 :       2500 :               const char *file = dwfl_dwarf_line_file (line);
     102         [ +  + ]:       2500 :               if (file != lastfile)
     103                 :            :                 {
     104                 :            :                   /* Match the name with the name the user provided.  */
     105                 :         56 :                   lastfile = file;
     106         [ +  - ]:         56 :                   lastmatch = !strcmp (is_basename ? xbasename (file) : file,
     107                 :            :                                        fname);
     108                 :            :                 }
     109                 :            :             }
     110         [ +  + ]:       2500 :           if (!lastmatch)
     111                 :        112 :             continue;
     112                 :            : 
     113                 :            :           /* See whether line and possibly column match.  */
     114         [ +  - ]:       2388 :           if (lineno != 0
     115         [ +  + ]:       2388 :               && (lineno > line->line
     116   [ -  +  -  - ]:       1278 :                   || (column != 0 && column > line->column)))
     117                 :            :             /* Cannot match.  */
     118                 :       1110 :             continue;
     119                 :            : 
     120                 :            :           /* Determine whether this is the best match so far.  */
     121                 :            :           size_t inner;
     122         [ +  + ]:       1278 :           for (inner = 0; inner < cur_match; ++inner)
     123                 :       1262 :             if (dwfl_line_file (match[inner])
     124         [ -  + ]:       1262 :                 == dwfl_dwarf_line_file (line))
     125                 :            :               break;
     126         [ +  + ]:       1278 :           if (inner < cur_match
     127         [ +  + ]:       1262 :               && (dwfl_line (match[inner])->line != line->line
     128         [ +  + ]:          8 :                   || dwfl_line (match[inner])->line != lineno
     129         [ -  + ]:          6 :                   || (column != 0
     130         [ #  # ]:          0 :                       && (dwfl_line (match[inner])->column != line->column
     131         [ #  # ]:          0 :                           || dwfl_line (match[inner])->column != column))))
     132                 :            :             {
     133                 :            :               /* We know about this file already.  If this is a better
     134                 :            :                  match for the line number, use it.  */
     135         [ +  + ]:       1256 :               if (dwfl_line (match[inner])->line >= line->line
     136         [ +  + ]:         14 :                   && (dwfl_line (match[inner])->line != line->line
     137         [ +  - ]:          2 :                       || dwfl_line (match[inner])->column >= line->column))
     138                 :            :                 /* Use the new line.  Otherwise the old one.  */
     139                 :         14 :                 match[inner] = &cu->lines->idx[cnt];
     140                 :       1256 :               continue;
     141                 :            :             }
     142                 :            : 
     143         [ -  + ]:         22 :           if (cur_match < max_match)
     144                 :            :             {
     145         [ +  + ]:         22 :               if (cur_match == act_match)
     146                 :            :                 {
     147                 :            :                   /* Enlarge the array for the results.  */
     148                 :         16 :                   act_match += 10;
     149                 :         16 :                   Dwfl_Line **newp = realloc (match,
     150                 :            :                                               act_match
     151                 :            :                                               * sizeof (Dwfl_Line *));
     152         [ -  + ]:         16 :                   if (newp == NULL)
     153                 :            :                     {
     154                 :          0 :                       free (match);
     155                 :          0 :                       __libdwfl_seterrno (DWFL_E_NOMEM);
     156                 :          0 :                       return -1;
     157                 :            :                     }
     158                 :            :                   match = newp;
     159                 :            :                 }
     160                 :            : 
     161                 :         22 :               match[cur_match++] = &cu->lines->idx[cnt];
     162                 :            :             }
     163                 :            :         }
     164                 :            :     }
     165                 :            : 
     166         [ +  + ]:         20 :   if (cur_match > 0)
     167                 :            :     {
     168   [ -  +  -  - ]:         16 :       assert (*nsrcs == 0 || *srcsp == match);
     169                 :            : 
     170                 :         16 :       *nsrcs = cur_match;
     171                 :         16 :       *srcsp = match;
     172                 :            : 
     173                 :         16 :       return 0;
     174                 :            :     }
     175                 :            : 
     176                 :          4 :   __libdwfl_seterrno (DWFL_E_NO_MATCH);
     177                 :          4 :   return -1;
     178                 :            : }

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