gdb/dwarf2/abbrev.h

   1 /* DWARF abbrev table
   2
   3    Copyright (C) 1994-2020 Free Software Foundation, Inc.
   4
   5    Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
   6    Inc.  with support from Florida State University (under contract
   7    with the Ada Joint Program Office), and Silicon Graphics, Inc.
   8    Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
   9    based on Fred Fish's (Cygnus Support) implementation of DWARF 1
  10    support.
  11
  12    This file is part of GDB.
  13
  14    This program is free software; you can redistribute it and/or modify
  15    it under the terms of the GNU General Public License as published by
  16    the Free Software Foundation; either version 3 of the License, or
  17    (at your option) any later version.
  18
  19    This program is distributed in the hope that it will be useful,
  20    but WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22    GNU General Public License for more details.
  23
  24    You should have received a copy of the GNU General Public License
  25    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  26
  27 #ifndef GDB_DWARF2_ABBREV_H
  28 #define GDB_DWARF2_ABBREV_H
  29
  30 /* This data structure holds the information of an abbrev.  */
  31 struct abbrev_info
  32   {
  33     unsigned int number;        /* number identifying abbrev */
  34     enum dwarf_tag tag;         /* dwarf tag */
  35     unsigned short has_children;                /* boolean */
  36     unsigned short num_attrs;   /* number of attributes */
  37     struct attr_abbrev *attrs;  /* an array of attribute descriptions */
  38   };
  39
  40 struct attr_abbrev
  41   {
  42     ENUM_BITFIELD(dwarf_attribute) name : 16;
  43     ENUM_BITFIELD(dwarf_form) form : 16;
  44
  45     /* It is valid only if FORM is DW_FORM_implicit_const.  */
  46     LONGEST implicit_const;
  47   };
  48
  49 struct abbrev_table;
  50 typedef std::unique_ptr<struct abbrev_table> abbrev_table_up;
  51
  52 /* Top level data structure to contain an abbreviation table.  */
  53
  54 struct abbrev_table
  55 {
  56   static abbrev_table_up read (struct objfile *objfile,
  57                                struct dwarf2_section_info *section,
  58                                sect_offset sect_off);
  59
  60   /* Look up an abbrev in the table.
  61      Returns NULL if the abbrev is not found.  */
  62
  63   struct abbrev_info *lookup_abbrev (unsigned int abbrev_number);
  64
  65
  66   /* Where the abbrev table came from.
  67      This is used as a sanity check when the table is used.  */
  68   const sect_offset sect_off;
  69
  70 private:
  71
  72   explicit abbrev_table (sect_offset off);
  73
  74   DISABLE_COPY_AND_ASSIGN (abbrev_table);
  75
  76   /* Allocate space for a struct abbrev_info object in
  77      ABBREV_TABLE.  */
  78   struct abbrev_info *alloc_abbrev ();
  79
  80   /* Add an abbreviation to the table.  */
  81   void add_abbrev (unsigned int abbrev_number, struct abbrev_info *abbrev);
  82
  83   /* Hash table of abbrevs.  */
  84   htab_up m_abbrevs;
  85
  86   /* Storage for the abbrev table.  */
  87   auto_obstack m_abbrev_obstack;
  88 };
  89
  90 #endif /* GDB_DWARF2_ABBREV_H */