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/* Public partial symbol table definitions.
Copyright (C) 2009-2022 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 PSYMTAB_H
#define PSYMTAB_H
#include "gdbsupport/gdb_obstack.h"
#include "symfile.h"
#include "gdbsupport/next-iterator.h"
#include "bcache.h"
struct partial_symbol;
/* Specialization of bcache to store partial symbols. */
struct psymbol_bcache : public gdb::bcache
{
/* Calculate a hash code for the given partial symbol. The hash is
calculated using the symbol's value, language, domain, class
and name. These are the values which are set by
add_psymbol_to_bcache. */
unsigned long hash (const void *addr, int length) override;
/* Returns true if the symbol LEFT equals the symbol RIGHT.
For the comparison this function uses a symbols value,
language, domain, class and name. */
int compare (const void *left, const void *right, int length) override;
};
/* An instance of this class manages the partial symbol tables and
partial symbols for a given objfile.
The core psymtab functions -- those in psymtab.c -- arrange for
nearly all psymtab- and psymbol-related allocations to happen
either in the psymtab_storage object (either on its obstack or in
other memory managed by this class), or on the per-BFD object. The
only link from the psymtab storage object back to the objfile (or
objfile_obstack) that is made by the core psymtab code is the
compunit_symtab member in the standard_psymtab -- and a given
symbol reader can avoid this by implementing its own subclasses of
partial_symtab.
However, it is up to each symbol reader to maintain this invariant
in other ways, if it wants to reuse psymtabs across multiple
objfiles. The main issue here is ensuring that read_symtab_private
does not point into objfile_obstack. */
class psymtab_storage
{
public:
psymtab_storage () = default;
~psymtab_storage ();
DISABLE_COPY_AND_ASSIGN (psymtab_storage);
/* Discard all partial symbol tables starting with "psymtabs" and
proceeding until "to" has been discarded. */
void discard_psymtabs_to (struct partial_symtab *to)
{
while (psymtabs != to)
discard_psymtab (psymtabs);
}
/* Discard the partial symbol table. */
void discard_psymtab (struct partial_symtab *pst);
/* Return the obstack that is used for storage by this object. */
struct obstack *obstack ()
{
if (!m_obstack.has_value ())
m_obstack.emplace ();
return &*m_obstack;
}
/* Allocate storage for the "dependencies" field of a psymtab.
NUMBER says how many dependencies there are. */
struct partial_symtab **allocate_dependencies (int number)
{
return OBSTACK_CALLOC (obstack (), number, struct partial_symtab *);
}
/* Install a psymtab on the psymtab list. This transfers ownership
of PST to this object. */
void install_psymtab (partial_symtab *pst);
using partial_symtab_range = next_range<partial_symtab>;
/* A range adapter that makes it possible to iterate over all
psymtabs in one objfile. */
partial_symtab_range range ()
{
return partial_symtab_range (psymtabs);
}
/* Each objfile points to a linked list of partial symtabs derived from
this file, one partial symtab structure for each compilation unit
(source file). */
struct partial_symtab *psymtabs = nullptr;
/* A byte cache where we can stash arbitrary "chunks" of bytes that
will not change. */
psymbol_bcache psymbol_cache;
private:
/* The obstack where allocations are made. This is lazily allocated
so that we don't waste memory when there are no psymtabs. */
gdb::optional<auto_obstack> m_obstack;
};
#endif /* PSYMTAB_H */
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