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/* DWARF DIEs
Copyright (C) 2003-2023 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef GDB_DWARF2_DIE_H
#define GDB_DWARF2_DIE_H
#include "complaints.h"
#include "dwarf2/attribute.h"
/* This data structure holds a complete die structure. */
struct die_info
{
/* Allocate a new die_info on OBSTACK. NUM_ATTRS is the number of
attributes that are needed. */
static die_info *allocate (struct obstack *obstack, int num_attrs);
/* Trivial hash function for die_info: the hash value of a DIE is
its offset in .debug_info for this objfile. */
static hashval_t hash (const void *item);
/* Trivial comparison function for die_info structures: two DIEs
are equal if they have the same offset. */
static int eq (const void *item_lhs, const void *item_rhs);
/* Dump this DIE and any children to MAX_LEVEL. They are written to
gdb_stdlog. Note this is called from the pdie user command in
gdb-gdb.gdb. */
void dump (int max_level);
/* Shallowly dump this DIE to gdb_stderr. */
void error_dump ();
/* Return the named attribute or NULL if not there, but do not
follow DW_AT_specification, etc. */
struct attribute *attr (dwarf_attribute name)
{
for (unsigned i = 0; i < num_attrs; ++i)
if (attrs[i].name == name)
return &attrs[i];
return NULL;
}
/* Return the address base of the compile unit, which, if exists, is
stored either at the attribute DW_AT_GNU_addr_base, or
DW_AT_addr_base. */
std::optional<ULONGEST> addr_base ()
{
for (unsigned i = 0; i < num_attrs; ++i)
if (attrs[i].name == DW_AT_addr_base
|| attrs[i].name == DW_AT_GNU_addr_base)
{
if (attrs[i].form_is_unsigned ())
{
/* If both exist, just use the first one. */
return attrs[i].as_unsigned ();
}
complaint (_("address base attribute (offset %s) as wrong form"),
sect_offset_str (sect_off));
}
return std::optional<ULONGEST> ();
}
/* Return the base address of the compile unit into the .debug_ranges section,
which, if exists, is stored in the DW_AT_GNU_ranges_base attribute. This
value is only relevant in pre-DWARF 5 split-unit scenarios. */
ULONGEST gnu_ranges_base ()
{
for (unsigned i = 0; i < num_attrs; ++i)
if (attrs[i].name == DW_AT_GNU_ranges_base)
{
if (attrs[i].form_is_unsigned ())
return attrs[i].as_unsigned ();
complaint (_("ranges base attribute (offset %s) has wrong form"),
sect_offset_str (sect_off));
}
return 0;
}
/* Return the rnglists base of the compile unit, which, if exists, is stored
in the DW_AT_rnglists_base attribute. */
ULONGEST rnglists_base ()
{
for (unsigned i = 0; i < num_attrs; ++i)
if (attrs[i].name == DW_AT_rnglists_base)
{
if (attrs[i].form_is_unsigned ())
return attrs[i].as_unsigned ();
complaint (_("rnglists base attribute (offset %s) has wrong form"),
sect_offset_str (sect_off));
}
return 0;
}
/* DWARF-2 tag for this DIE. */
ENUM_BITFIELD(dwarf_tag) tag : 16;
/* Number of attributes */
unsigned char num_attrs;
/* True if we're presently building the full type name for the
type derived from this DIE. */
unsigned char building_fullname : 1;
/* True if this die is in process. PR 16581. */
unsigned char in_process : 1;
/* True if this DIE has children. */
unsigned char has_children : 1;
/* Abbrev number */
unsigned int abbrev;
/* Offset in .debug_info or .debug_types section. */
sect_offset sect_off;
/* The dies in a compilation unit form an n-ary tree. PARENT
points to this die's parent; CHILD points to the first child of
this node; and all the children of a given node are chained
together via their SIBLING fields. */
struct die_info *child; /* Its first child, if any. */
struct die_info *sibling; /* Its next sibling, if any. */
struct die_info *parent; /* Its parent, if any. */
/* An array of attributes, with NUM_ATTRS elements. There may be
zero, but it's not common and zero-sized arrays are not
sufficiently portable C. */
struct attribute attrs[1];
};
#endif /* GDB_DWARF2_DIE_H */
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