Line data    Source code

       1             : /* Find line information for a given macro.
       2             :    Copyright (C) 2014 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             : int
      36          13 : dwarf_macro_getsrcfiles (Dwarf *dbg, Dwarf_Macro *macro,
      37             :                          Dwarf_Files **files, size_t *nfiles)
      38             : {
      39             :   /* macro is declared NN */
      40          13 :   Dwarf_Macro_Op_Table *const table = macro->table;
      41          13 :   if (table->files == NULL)
      42             :     {
      43           4 :       Dwarf_Off line_offset = table->line_offset;
      44           4 :       if (line_offset == (Dwarf_Off) -1)
      45             :         {
      46           0 :           *files = NULL;
      47           0 :           *nfiles = 0;
      48           0 :           return 0;
      49             :         }
      50             : 
      51             :       /* If TABLE->comp_dir is NULL that could mean any of the
      52             :          following:
      53             : 
      54             :          - The macro unit is not bound to a CU.  It's an auxiliary
      55             :            unit used purely for import from other units.  In that case
      56             :            there's actually no COMP_DIR value that we could use.
      57             : 
      58             :          - The macro unit is bound to a CU, but there's no
      59             :            DW_AT_comp_dir attribute at the CU DIE.
      60             : 
      61             :          - The macro unit is bound to a CU, but we don't know that,
      62             :            likely because its iteration was requested through
      63             :            dwarf_getmacros_off interface.  This might be legitimate if
      64             :            one macro unit imports another CU's macro unit, but that is
      65             :            unlikely to happen in practice.  Most probably this is not
      66             :            legitimate use of the interfaces.
      67             : 
      68             :          So when the interfaces are used correctly, COMP_DIR value is
      69             :          always right.  That means that we can cache the parsed
      70             :          .debug_line unit without fear that later on someone requests
      71             :          the same unit through dwarf_getsrcfiles, and the file names
      72             :          will be broken.  */
      73             : 
      74           4 :       if (__libdw_getsrclines (dbg, line_offset, table->comp_dir,
      75           4 :                                table->is_64bit ? 8 : 4,
      76             :                                NULL, &table->files) < 0)
      77           0 :         table->files = (void *) -1;
      78             :     }
      79             : 
      80          13 :   if (table->files == (void *) -1)
      81             :     return -1;
      82             : 
      83          13 :   *files = table->files;
      84          13 :   *nfiles = table->files->nfiles;
      85          13 :   return 0;
      86             : }