Add psymtab_storage::allocate_dependencies

[deliverable/binutils-gdb.git] / gdb / psymtab.h

/* Public partial symbol table definitions.

   Copyright (C) 2009-2019 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 "gdb_obstack.h"
#include "symfile.h"
#include "common/next-iterator.h"

struct partial_symbol;

/* A bcache for partial symbols.  */

struct psymbol_bcache;

/* An instance of this class manages the partial symbol tables and
   partial symbols for a given objfile.  */

class psymtab_storage
{
public:

  explicit psymtab_storage (struct objfile *objfile);

  ~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 ()
  {
    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 *);
  }


  /* 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;

  /* Map addresses to the entries of PSYMTABS.  It would be more efficient to
     have a map per the whole process but ADDRMAP cannot selectively remove
     its items during FREE_OBJFILE.  This mapping is already present even for
     PARTIAL_SYMTABs which still have no corresponding full SYMTABs read.  */

  struct addrmap *psymtabs_addrmap = nullptr;

  /* List of freed partial symtabs, available for re-use.  */

  struct partial_symtab *free_psymtabs = nullptr;

  /* A byte cache where we can stash arbitrary "chunks" of bytes that
     will not change.  */

  struct psymbol_bcache *psymbol_cache;

  /* Vectors of all partial symbols read in from file.  The actual data
     is stored in the objfile_obstack.  */

  std::vector<partial_symbol *> global_psymbols;
  std::vector<partial_symbol *> static_psymbols;

private:

  /* The obstack where allocations are made.  */

  struct obstack *m_obstack;
};


extern struct psymbol_bcache *psymbol_bcache_init (void);
extern void psymbol_bcache_free (struct psymbol_bcache *);
extern struct bcache *psymbol_bcache_get_bcache (struct psymbol_bcache *);

extern const struct quick_symbol_functions psym_functions;

extern const struct quick_symbol_functions dwarf2_gdb_index_functions;
extern const struct quick_symbol_functions dwarf2_debug_names_functions;

/* Ensure that the partial symbols for OBJFILE have been loaded.  If
   VERBOSE is non-zero, then this will print a message when symbols
   are loaded.  This function returns a range adapter suitable for
   iterating over the psymtabs of OBJFILE.  */

class objfile_psymtabs;
extern objfile_psymtabs require_partial_symbols (struct objfile *objfile,
						 int verbose);

#endif /* PSYMTAB_H */