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/* Routines for name->symbol lookups in GDB.

   Copyright (C) 2003, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.

   Contributed by David Carlton <carlton@bactrian.org> and by Kealia,

   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 DICTIONARY_H

#define DICTIONARY_H

/* An opaque type for dictionaries; only dictionary.c should know

   about its innards.  */

struct dictionary;

/* Other types needed for declarations.  */

struct symbol;

struct obstack;

struct pending;

/* The creation functions for various implementations of

   dictionaries.  */

/* Create a dictionary implemented via a fixed-size hashtable.  All

   memory it uses is allocated on OBSTACK; the environment is

   initialized from SYMBOL_LIST.  */

extern struct dictionary *dict_create_hashed (struct obstack *obstack,

                                              const struct pending

                                              *symbol_list);

/* Create a dictionary implemented via a hashtable that grows as

   necessary.  The dictionary is initially empty; to add symbols to

   it, call dict_add_symbol().  Call dict_free() when you're done with

   it.  */

extern struct dictionary *dict_create_hashed_expandable (void);

/* Create a dictionary implemented via a fixed-size array.  All memory

   it uses is allocated on OBSTACK; the environment is initialized

   from the SYMBOL_LIST.  The symbols are ordered in the same order

   that they're found in SYMBOL_LIST.  */

extern struct dictionary *dict_create_linear (struct obstack *obstack,

                                              const struct pending

                                              *symbol_list);

/* Create a dictionary implemented via an array that grows as

   necessary.  The dictionary is initially empty; to add symbols to

   it, call dict_add_symbol().  Call dict_free() when you're done with

   it.  */

extern struct dictionary *dict_create_linear_expandable (void);

/* The functions providing the interface to dictionaries.  Note that

   the most common parts of the interface, namely symbol lookup, are

   only provided via iterator functions.  */

/* Free the memory used by a dictionary that's not on an obstack.  (If

   any.)  */

extern void dict_free (struct dictionary *dict);

/* Add a symbol to an expandable dictionary.  */

extern void dict_add_symbol (struct dictionary *dict, struct symbol *sym);

/* Is the dictionary empty?  */

extern int dict_empty (struct dictionary *dict);

/* A type containing data that is used when iterating over all symbols

   in a dictionary.  Don't ever look at its innards; this type would

   be opaque if we didn't need to be able to allocate it on the

   stack.  */

struct dict_iterator

{

  /* The dictionary that this iterator is associated to.  */

  const struct dictionary *dict;

  /* The next two members are data that is used in a way that depends

     on DICT's implementation type.  */

  int index;

  struct symbol *current;

};

/* Initialize ITERATOR to point at the first symbol in DICT, and

   return that first symbol, or NULL if DICT is empty.  */

extern struct symbol *dict_iterator_first (const struct dictionary *dict,

                                           struct dict_iterator *iterator);

/* Advance ITERATOR, and return the next symbol, or NULL if there are

   no more symbols.  Don't call this if you've previously received

   NULL from dict_iterator_first or dict_iterator_next on this

   iteration.  */

extern struct symbol *dict_iterator_next (struct dict_iterator *iterator);

/* Initialize ITERATOR to point at the first symbol in DICT whose

   SYMBOL_BEST_NAME is NAME (as tested using strcmp_iw), and return

   that first symbol, or NULL if there are no such symbols.  */

extern struct symbol *dict_iter_name_first (const struct dictionary *dict,

                                            const char *name,

                                            struct dict_iterator *iterator);

/* Advance ITERATOR to point at the next symbol in DICT whose

   SYMBOL_BEST_NAME is NAME (as tested using strcmp_iw), or NULL if

   there are no more such symbols.  Don't call this if you've

   previously received NULL from dict_iterator_first or

   dict_iterator_next on this iteration.  And don't call it unless

   ITERATOR was created by a previous call to dict_iter_name_first

   with the same NAME.  */

extern struct symbol *dict_iter_name_next (const char *name,

                                           struct dict_iterator *iterator);

/* Return some notion of the size of the dictionary: the number of

   symbols if we have that, the number of hash buckets otherwise.  */

extern int dict_size (const struct dictionary *dict);

/* Macro to loop through all symbols in a dictionary DICT, in no

   particular order.  ITER is a struct dict_iterator (NOTE: __not__ a

   struct dict_iterator *), and SYM points to the current symbol.

   It's implemented as a single loop, so you can terminate the loop

   early by a break if you desire.  */

#define ALL_DICT_SYMBOLS(dict, iter, sym)                       \

        for ((sym) = dict_iterator_first ((dict), &(iter));     \

             (sym);                                             \

             (sym) = dict_iterator_next (&(iter)))

#endif /* DICTIONARY_H */