gdb/dwarf2/dwz.h

   1 /* DWARF DWZ handling for GDB.
   2
   3    Copyright (C) 2003-2021 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GDB_DWARF2_DWZ_H
  21 #define GDB_DWARF2_DWZ_H
  22
  23 #include "gdb_bfd.h"
  24 #include "dwarf2/index-cache.h"
  25 #include "dwarf2/section.h"
  26
  27 struct dwarf2_per_bfd;
  28
  29 /* This represents a '.dwz' file.  */
  30
  31 struct dwz_file
  32 {
  33   dwz_file (gdb_bfd_ref_ptr &&bfd)
  34     : dwz_bfd (std::move (bfd))
  35   {
  36   }
  37
  38   const char *filename () const
  39   {
  40     return bfd_get_filename (this->dwz_bfd.get ());
  41   }
  42
  43   /* A dwz file can only contain a few sections.  */
  44   struct dwarf2_section_info abbrev {};
  45   struct dwarf2_section_info info {};
  46   struct dwarf2_section_info str {};
  47   struct dwarf2_section_info line {};
  48   struct dwarf2_section_info macro {};
  49   struct dwarf2_section_info gdb_index {};
  50   struct dwarf2_section_info debug_names {};
  51
  52   /* The dwz's BFD.  */
  53   gdb_bfd_ref_ptr dwz_bfd;
  54
  55   /* If we loaded the index from an external file, this contains the
  56      resources associated to the open file, memory mapping, etc.  */
  57   std::unique_ptr<index_cache_resource> index_cache_res;
  58
  59   /* Read a string at offset STR_OFFSET in the .debug_str section from
  60      this dwz file.  Throw an error if the offset is too large.  If
  61      the string consists of a single NUL byte, return NULL; otherwise
  62      return a pointer to the string.  */
  63
  64   const char *read_string (struct objfile *objfile, LONGEST str_offset);
  65 };
  66
  67 /* Open the separate '.dwz' debug file, if needed.  If there is no
  68    .gnu_debugaltlink section in the file, then the result depends on
  69    REQUIRE: if REQUIRE is true, then error; if REQUIRE is false,
  70    return NULL.  Always error if there is such a section but the file
  71    cannot be found.  */
  72
  73 extern dwz_file *dwarf2_get_dwz_file (dwarf2_per_bfd *per_bfd,
  74                                       bool require = false);
  75
  76 #endif /* GDB_DWARF2_DWZ_H */