gdb/dwarf2/abbrev.h

   1 /* DWARF abbrev table
   2
   3    Copyright (C) 1994-2021 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 #include "hashtab.h"
  31
  32 /* This data structure holds the information of an abbrev.  */
  33 struct abbrev_info
  34   {
  35     unsigned int number;        /* number identifying abbrev */
  36     enum dwarf_tag tag;         /* dwarf tag */
  37     unsigned short has_children;                /* boolean */
  38     unsigned short num_attrs;   /* number of attributes */
  39     struct attr_abbrev *attrs;  /* an array of attribute descriptions */
  40   };
  41
  42 struct attr_abbrev
  43   {
  44     ENUM_BITFIELD(dwarf_attribute) name : 16;
  45     ENUM_BITFIELD(dwarf_form) form : 16;
  46
  47     /* It is valid only if FORM is DW_FORM_implicit_const.  */
  48     LONGEST implicit_const;
  49   };
  50
  51 struct abbrev_table;
  52 typedef std::unique_ptr<struct abbrev_table> abbrev_table_up;
  53
  54 /* Top level data structure to contain an abbreviation table.  */
  55
  56 struct abbrev_table
  57 {
  58   /* Read an abbrev table from the indicated section, at the given
  59      offset.  The caller is responsible for ensuring that the section
  60      has already been read.  */
  61
  62   static abbrev_table_up read (struct dwarf2_section_info *section,
  63                                sect_offset sect_off);
  64
  65   /* Look up an abbrev in the table.
  66      Returns NULL if the abbrev is not found.  */
  67
  68   struct abbrev_info *lookup_abbrev (unsigned int abbrev_number)
  69   {
  70     struct abbrev_info search;
  71     search.number = abbrev_number;
  72
  73     return (struct abbrev_info *) htab_find_with_hash (m_abbrevs.get (),
  74                                                        &search,
  75                                                        abbrev_number);
  76   }
  77
  78   /* Where the abbrev table came from.
  79      This is used as a sanity check when the table is used.  */
  80   const sect_offset sect_off;
  81
  82 private:
  83
  84   explicit abbrev_table (sect_offset off);
  85
  86   DISABLE_COPY_AND_ASSIGN (abbrev_table);
  87
  88   /* Allocate space for a struct abbrev_info object in
  89      ABBREV_TABLE.  */
  90   struct abbrev_info *alloc_abbrev ();
  91
  92   /* Add an abbreviation to the table.  */
  93   void add_abbrev (struct abbrev_info *abbrev);
  94
  95   /* Hash table of abbrevs.  */
  96   htab_up m_abbrevs;
  97
  98   /* Storage for the abbrev table.  */
  99   auto_obstack m_abbrev_obstack;
 100 };
 101
 102 #endif /* GDB_DWARF2_ABBREV_H */