LCOV - code coverage report
Current view: top level - libdw - dwarf_next_lines.c (source / functions) Hit Total Coverage
Test: elfutils-0.189 Lines: 59 82 72.0 %
Date: 2023-08-02 17:40:45 Functions: 1 1 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 42 74 56.8 %

           Branch data     Line data    Source code
       1                 :            : /* Iterate through the debug line table.
       2                 :            :    Copyright (C) 2018 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                 :            : 
      35                 :            : 
      36                 :            : int
      37                 :        127 : dwarf_next_lines (Dwarf *dbg, Dwarf_Off off,
      38                 :            :                   Dwarf_Off *next_off, Dwarf_CU **cu,
      39                 :            :                   Dwarf_Files **srcfiles, size_t *nfiles,
      40                 :            :                   Dwarf_Lines **srclines, size_t *nlines)
      41                 :            : {
      42                 :            :   /* Ignore existing errors.  */
      43         [ +  - ]:        127 :   if (dbg == NULL)
      44                 :            :     return -1;
      45                 :            : 
      46                 :        127 :   Elf_Data *lines = dbg->sectiondata[IDX_debug_line];
      47         [ -  + ]:        127 :   if (lines == NULL)
      48                 :            :     {
      49                 :          0 :       __libdw_seterrno (DWARF_E_NO_DEBUG_LINE);
      50                 :          0 :       return -1;
      51                 :            :     }
      52                 :            : 
      53         [ +  - ]:        127 :   if (off == (Dwarf_Off) -1
      54         [ +  - ]:        127 :       || lines->d_size < 4
      55         [ +  + ]:        127 :       || off >= lines->d_size)
      56                 :            :     {
      57                 :         53 :       *next_off = (Dwarf_Off) -1;
      58                 :         53 :       return 1;
      59                 :            :     }
      60                 :            : 
      61                 :            :   /* Read enough of the header to know where the next table is and
      62                 :            :      whether we need to lookup the CU (version < 5).  */
      63                 :         74 :   const unsigned char *linep = lines->d_buf + off;
      64                 :         74 :   const unsigned char *lineendp = lines->d_buf + lines->d_size;
      65                 :            : 
      66         [ -  + ]:         74 :   if ((size_t) (lineendp - linep) < 4)
      67                 :            :     {
      68                 :          0 :     invalid_data:
      69                 :          0 :       __libdw_seterrno (DWARF_E_INVALID_DEBUG_LINE);
      70                 :          0 :       return -1;
      71                 :            :     }
      72                 :            : 
      73                 :         74 :   *next_off = off + 4;
      74         [ +  + ]:         74 :   Dwarf_Word unit_length = read_4ubyte_unaligned_inc (dbg, linep);
      75         [ -  + ]:         74 :   if (unit_length == DWARF3_LENGTH_64_BIT)
      76                 :            :     {
      77         [ #  # ]:          0 :       if ((size_t) (lineendp - linep) < 8)
      78                 :          0 :         goto invalid_data;
      79         [ #  # ]:          0 :       unit_length = read_8ubyte_unaligned_inc (dbg, linep);
      80                 :          0 :       *next_off += 8;
      81                 :            :     }
      82                 :            : 
      83         [ -  + ]:         74 :   if (unit_length > (size_t) (lineendp - linep))
      84                 :          0 :     goto invalid_data;
      85                 :            : 
      86                 :         74 :   *next_off += unit_length;
      87                 :         74 :   lineendp = linep + unit_length;
      88                 :            : 
      89         [ -  + ]:         74 :   if ((size_t) (lineendp - linep) < 2)
      90                 :          0 :     goto invalid_data;
      91         [ +  + ]:         74 :   uint_fast16_t version = read_2ubyte_unaligned_inc (dbg, linep);
      92                 :            : 
      93                 :         74 :   Dwarf_Die cudie;
      94         [ +  + ]:         74 :   if (version < 5)
      95                 :            :     {
      96                 :            :       /* We need to find the matching CU to get the comp_dir.  Use the
      97                 :            :          given CU as hint where to start searching.  Normally it will
      98                 :            :          be the next CU that has a statement list. */
      99                 :         68 :       Dwarf_CU *given_cu = *cu;
     100                 :         68 :       Dwarf_CU *next_cu = given_cu;
     101                 :         68 :       bool found = false;
     102                 :         68 :       while (dwarf_get_units (dbg, next_cu, &next_cu, NULL, NULL,
     103         [ +  + ]:         68 :                               &cudie, NULL) == 0)
     104                 :            :         {
     105         [ +  + ]:         61 :           if (dwarf_hasattr (&cudie, DW_AT_stmt_list))
     106                 :            :             {
     107                 :         59 :               Dwarf_Attribute attr;
     108                 :         59 :               Dwarf_Word stmt_off;
     109         [ +  - ]:         59 :               if (dwarf_formudata (dwarf_attr (&cudie, DW_AT_stmt_list, &attr),
     110                 :            :                                    &stmt_off) == 0
     111         [ +  - ]:         59 :                   && stmt_off == off)
     112                 :            :                 {
     113                 :         59 :                   found = true;
     114                 :         59 :                   break;
     115                 :            :                 }
     116                 :            :             }
     117         [ +  - ]:          2 :           else if (off == 0
     118                 :          2 :                    && (next_cu->unit_type == DW_UT_split_compile
     119         [ +  - ]:          2 :                        || next_cu->unit_type == DW_UT_split_type))
     120                 :            :             {
     121                 :            :               /* For split units (in .dwo files) there is only one table
     122                 :            :                  at offset zero (containing just the files, no lines).  */
     123                 :            :               found = true;
     124                 :            :               break;
     125                 :            :             }
     126                 :            :         }
     127                 :            : 
     128         [ -  + ]:         68 :       if (!found && given_cu != NULL)
     129                 :            :         {
     130                 :            :           /* The CUs might be in a different order from the line
     131                 :            :              tables. Need to do a linear search (but stop at the given
     132                 :            :              CU, since we already searched those.  */
     133                 :          0 :           next_cu = NULL;
     134                 :          0 :           while (dwarf_get_units (dbg, next_cu, &next_cu, NULL, NULL,
     135                 :            :                                   &cudie, NULL) == 0
     136   [ #  #  #  # ]:          0 :                  && next_cu != given_cu)
     137                 :            :             {
     138                 :          0 :               Dwarf_Attribute attr;
     139                 :          0 :               Dwarf_Word stmt_off;
     140         [ #  # ]:          0 :               if (dwarf_formudata (dwarf_attr (&cudie, DW_AT_stmt_list, &attr),
     141                 :            :                                    &stmt_off) == 0
     142         [ #  # ]:          0 :                   && stmt_off == off)
     143                 :            :                 {
     144                 :          0 :                   found = true;
     145                 :          0 :                   break;
     146                 :            :                 }
     147                 :            :             }
     148                 :            :         }
     149                 :            : 
     150         [ +  + ]:         68 :       if (found)
     151                 :         61 :         *cu = next_cu;
     152                 :            :       else
     153                 :          7 :         *cu = NULL;
     154                 :            :     }
     155                 :            :   else
     156                 :          6 :     *cu = NULL;
     157                 :            : 
     158                 :         74 :   const char *comp_dir;
     159                 :         74 :   unsigned address_size;
     160         [ +  + ]:         74 :   if (*cu != NULL)
     161                 :            :     {
     162                 :         61 :       comp_dir = __libdw_getcompdir (&cudie);
     163                 :         61 :       address_size = (*cu)->address_size;
     164                 :            :     }
     165                 :            :   else
     166                 :            :     {
     167                 :         13 :       comp_dir = NULL;
     168                 :            : 
     169                 :         13 :       size_t esize;
     170                 :         13 :       char *ident = elf_getident (dbg->elf, &esize);
     171   [ +  -  -  + ]:         13 :       if (ident == NULL || esize < EI_NIDENT)
     172                 :          0 :         goto invalid_data;
     173         [ +  + ]:         20 :       address_size = ident[EI_CLASS] == ELFCLASS32 ? 4 : 8;
     174                 :            :     }
     175                 :            : 
     176         [ +  - ]:         74 :   if (__libdw_getsrclines (dbg, off, comp_dir, address_size,
     177                 :            :                            srclines, srcfiles) != 0)
     178                 :            :     return -1;
     179                 :            : 
     180         [ +  + ]:         74 :   if (nlines != NULL)
     181                 :            :     {
     182   [ +  -  +  - ]:         57 :       if (srclines != NULL && *srclines != NULL)
     183                 :         57 :         *nlines = (*srclines)->nlines;
     184                 :            :       else
     185                 :          0 :         *nlines = 0;
     186                 :            :     }
     187                 :            : 
     188         [ +  + ]:         74 :   if (nfiles != NULL)
     189                 :            :     {
     190   [ +  -  +  - ]:         17 :       if (srcfiles != NULL && *srcfiles != NULL)
     191                 :         17 :         *nfiles = (*srcfiles)->nfiles;
     192                 :            :       else
     193                 :          0 :         *nfiles = 0;
     194                 :            :     }
     195                 :            : 
     196                 :            :   return 0;
     197                 :            : }

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