gdb/dwarf2/die.h

   1 /* DWARF DIEs
   2
   3    Copyright (C) 2003-2020 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_DIE_H
  21 #define GDB_DWARF2_DIE_H
  22
  23 /* This data structure holds a complete die structure.  */
  24 struct die_info
  25 {
  26   /* Return the named attribute or NULL if not there, but do not
  27      follow DW_AT_specification, etc.  */
  28   struct attribute *attr (dwarf_attribute name)
  29   {
  30     for (unsigned i = 0; i < num_attrs; ++i)
  31       if (attrs[i].name == name)
  32         return &attrs[i];
  33     return NULL;
  34   }
  35
  36   /* Return the address base of the compile unit, which, if exists, is
  37      stored either at the attribute DW_AT_GNU_addr_base, or
  38      DW_AT_addr_base.  */
  39   gdb::optional<ULONGEST> addr_base ()
  40   {
  41     struct attribute *attr = this->attr (DW_AT_addr_base);
  42     if (attr == nullptr)
  43       attr = this->attr (DW_AT_GNU_addr_base);
  44     if (attr == nullptr)
  45       return gdb::optional<ULONGEST> ();
  46     return DW_UNSND (attr);
  47   }
  48
  49   /* Return range lists base of the compile unit, which, if exists, is
  50      stored either at the attribute DW_AT_rnglists_base or
  51      DW_AT_GNU_ranges_base.  */
  52   ULONGEST ranges_base ()
  53   {
  54     struct attribute *attr = this->attr (DW_AT_rnglists_base);
  55     if (attr == nullptr)
  56       attr = this->attr (DW_AT_GNU_ranges_base);
  57     if (attr == nullptr)
  58       return 0;
  59     return DW_UNSND (attr);
  60   }
  61
  62
  63   /* DWARF-2 tag for this DIE.  */
  64   ENUM_BITFIELD(dwarf_tag) tag : 16;
  65
  66   /* Number of attributes */
  67   unsigned char num_attrs;
  68
  69   /* True if we're presently building the full type name for the
  70      type derived from this DIE.  */
  71   unsigned char building_fullname : 1;
  72
  73   /* True if this die is in process.  PR 16581.  */
  74   unsigned char in_process : 1;
  75
  76   /* True if this DIE has children.  */
  77   unsigned char has_children : 1;
  78
  79   /* Abbrev number */
  80   unsigned int abbrev;
  81
  82   /* Offset in .debug_info or .debug_types section.  */
  83   sect_offset sect_off;
  84
  85   /* The dies in a compilation unit form an n-ary tree.  PARENT
  86      points to this die's parent; CHILD points to the first child of
  87      this node; and all the children of a given node are chained
  88      together via their SIBLING fields.  */
  89   struct die_info *child;       /* Its first child, if any.  */
  90   struct die_info *sibling;     /* Its next sibling, if any.  */
  91   struct die_info *parent;      /* Its parent, if any.  */
  92
  93   /* An array of attributes, with NUM_ATTRS elements.  There may be
  94      zero, but it's not common and zero-sized arrays are not
  95      sufficiently portable C.  */
  96   struct attribute attrs[1];
  97 };
  98
  99 #endif /* GDB_DWARF2_DIE_H */