LCOV - code coverage report
Current view: top level - libdw - dwarf_next_lines.c (source / functions) Hit Total Coverage
Test: elfutils-0.191 Lines: 63 79 79.7 %
Date: 2024-05-10 22:17:28 Functions: 1 1 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 41 64 64.1 %

           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                 :        302 : 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         [ +  - ]:        302 :   if (dbg == NULL)
      44                 :            :     return -1;
      45                 :            : 
      46                 :        302 :   Elf_Data *lines = dbg->sectiondata[IDX_debug_line];
      47         [ -  + ]:        302 :   if (lines == NULL)
      48                 :            :     {
      49                 :          0 :       __libdw_seterrno (DWARF_E_NO_DEBUG_LINE);
      50                 :          0 :       return -1;
      51                 :            :     }
      52                 :            : 
      53         [ +  - ]:        302 :   if (off == (Dwarf_Off) -1
      54         [ +  - ]:        302 :       || lines->d_size < 4
      55         [ +  + ]:        302 :       || off >= lines->d_size)
      56                 :            :     {
      57                 :        118 :       *next_off = (Dwarf_Off) -1;
      58                 :        118 :       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                 :        184 :   const unsigned char *linep = lines->d_buf + off;
      64                 :        184 :   const unsigned char *lineendp = lines->d_buf + lines->d_size;
      65                 :            : 
      66         [ -  + ]:        184 :   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                 :        184 :   *next_off = off + 4;
      74         [ +  + ]:        184 :   Dwarf_Word unit_length = read_4ubyte_unaligned_inc (dbg, linep);
      75         [ -  + ]:        184 :   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         [ -  + ]:        184 :   if (unit_length > (size_t) (lineendp - linep))
      84                 :          0 :     goto invalid_data;
      85                 :            : 
      86                 :        184 :   *next_off += unit_length;
      87                 :        184 :   lineendp = linep + unit_length;
      88                 :            : 
      89         [ -  + ]:        184 :   if ((size_t) (lineendp - linep) < 2)
      90                 :          0 :     goto invalid_data;
      91         [ +  + ]:        184 :   uint_fast16_t version = read_2ubyte_unaligned_inc (dbg, linep);
      92                 :            : 
      93                 :        184 :   Dwarf_Die cudie;
      94         [ +  + ]:        184 :   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.  If the CUs are in a
      99                 :            :          different order from the line tables, then we do a linear
     100                 :            :          search.  */
     101                 :        154 :       Dwarf_CU *given_cu = *cu;
     102                 :        154 :       Dwarf_CU *next_cu = given_cu;
     103                 :        154 :       bool restarted = false;
     104                 :        168 :       while (1)
     105                 :            :         {
     106         [ +  + ]:        168 :           if (restarted && next_cu == given_cu)
     107                 :            :             {
     108                 :            :               /* We checked all of the CUs and there was no match.  */
     109                 :         14 :               *cu = NULL;
     110                 :        154 :               break;
     111                 :            :             }
     112         [ +  + ]:        154 :           if (INTUSE(dwarf_get_units) (dbg, next_cu, &next_cu, NULL, NULL,
     113                 :            :                                        &cudie, NULL) != 0)
     114                 :            :             {
     115                 :            :               /* We didn't find the matching CU after the starting point.
     116                 :            :                  Check the CUs up to the starting point.  */
     117                 :         14 :               next_cu = NULL;
     118                 :         14 :               restarted = true;
     119                 :         14 :               continue;
     120                 :            :             }
     121                 :            : 
     122                 :        140 :           Dwarf_Word stmt_off = 0;
     123         [ +  + ]:        140 :           if (dwarf_hasattr (&cudie, DW_AT_stmt_list))
     124                 :            :             {
     125                 :        130 :               Dwarf_Attribute attr;
     126         [ -  + ]:        130 :               if (dwarf_formudata (dwarf_attr (&cudie, DW_AT_stmt_list, &attr),
     127                 :            :                                    &stmt_off) != 0)
     128                 :          0 :                 continue;
     129                 :            :             }
     130                 :            :           /* Split units have an implicit offset of 0.  */
     131                 :         10 :           else if (next_cu->unit_type != DW_UT_split_compile
     132         [ -  + ]:         10 :                    && next_cu->unit_type != DW_UT_split_type)
     133                 :          0 :             continue;
     134                 :            : 
     135                 :        140 :           Dwarf_Off dwp_off;
     136         [ +  - ]:        140 :           if (INTUSE(dwarf_cu_dwp_section_info) (next_cu, DW_SECT_LINE,
     137                 :            :                                                  &dwp_off, NULL) == 0)
     138                 :        140 :             stmt_off += dwp_off;
     139                 :            : 
     140         [ +  - ]:        140 :           if (stmt_off == off)
     141                 :            :             {
     142                 :        140 :               *cu = next_cu;
     143                 :        140 :               break;
     144                 :            :             }
     145                 :            :         }
     146                 :            :     }
     147                 :            :   else
     148                 :         30 :     *cu = NULL;
     149                 :            : 
     150                 :        184 :   const char *comp_dir;
     151                 :        184 :   unsigned address_size;
     152         [ +  + ]:        184 :   if (*cu != NULL)
     153                 :            :     {
     154                 :        140 :       comp_dir = __libdw_getcompdir (&cudie);
     155                 :        140 :       address_size = (*cu)->address_size;
     156                 :            :     }
     157                 :            :   else
     158                 :            :     {
     159                 :         44 :       comp_dir = NULL;
     160                 :            : 
     161                 :         44 :       size_t esize;
     162                 :         44 :       char *ident = elf_getident (dbg->elf, &esize);
     163   [ +  -  -  + ]:         44 :       if (ident == NULL || esize < EI_NIDENT)
     164                 :          0 :         goto invalid_data;
     165         [ +  + ]:         76 :       address_size = ident[EI_CLASS] == ELFCLASS32 ? 4 : 8;
     166                 :            :     }
     167                 :            : 
     168         [ +  - ]:        184 :   if (__libdw_getsrclines (dbg, off, comp_dir, address_size,
     169                 :            :                            srclines, srcfiles) != 0)
     170                 :            :     return -1;
     171                 :            : 
     172         [ +  + ]:        184 :   if (nlines != NULL)
     173                 :            :     {
     174   [ +  -  +  - ]:        126 :       if (srclines != NULL && *srclines != NULL)
     175                 :        126 :         *nlines = (*srclines)->nlines;
     176                 :            :       else
     177                 :          0 :         *nlines = 0;
     178                 :            :     }
     179                 :            : 
     180         [ +  + ]:        184 :   if (nfiles != NULL)
     181                 :            :     {
     182   [ +  -  +  - ]:         58 :       if (srcfiles != NULL && *srcfiles != NULL)
     183                 :         58 :         *nfiles = (*srcfiles)->nfiles;
     184                 :            :       else
     185                 :          0 :         *nfiles = 0;
     186                 :            :     }
     187                 :            : 
     188                 :            :   return 0;
     189                 :            : }

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