gdb/dictionary.h

   1 /* Routines for name->symbol lookups in GDB.
   2
   3    Copyright (C) 2003 Free Software Foundation, Inc.
   4
   5    Contributed by David Carlton <carlton@bactrian.org> and by Kealia,
   6    Inc.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or (at
  13    your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful, but
  16    WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  23    Boston, MA 02110-1301, USA.  */
  24
  25 #ifndef DICTIONARY_H
  26 #define DICTIONARY_H
  27
  28 /* An opaque type for dictionaries; only dictionary.c should know
  29    about its innards.  */
  30
  31 struct dictionary;
  32
  33 /* Other types needed for declarations.  */
  34
  35 struct symbol;
  36 struct obstack;
  37 struct pending;
  38
  39
  40 /* The creation functions for various implementations of
  41    dictionaries.  */
  42
  43 /* Create a dictionary implemented via a fixed-size hashtable.  All
  44    memory it uses is allocated on OBSTACK; the environment is
  45    initialized from SYMBOL_LIST.  */
  46
  47 extern struct dictionary *dict_create_hashed (struct obstack *obstack,
  48                                               const struct pending
  49                                               *symbol_list);
  50
  51 /* Create a dictionary implemented via a hashtable that grows as
  52    necessary.  The dictionary is initially empty; to add symbols to
  53    it, call dict_add_symbol().  Call dict_free() when you're done with
  54    it.  */
  55
  56 extern struct dictionary *dict_create_hashed_expandable (void);
  57
  58 /* Create a dictionary implemented via a fixed-size array.  All memory
  59    it uses is allocated on OBSTACK; the environment is initialized
  60    from the SYMBOL_LIST.  The symbols are ordered in the same order
  61    that they're found in SYMBOL_LIST.  */
  62
  63 extern struct dictionary *dict_create_linear (struct obstack *obstack,
  64                                               const struct pending
  65                                               *symbol_list);
  66
  67 /* Create a dictionary implemented via an array that grows as
  68    necessary.  The dictionary is initially empty; to add symbols to
  69    it, call dict_add_symbol().  Call dict_free() when you're done with
  70    it.  */
  71
  72 extern struct dictionary *dict_create_linear_expandable (void);
  73
  74
  75 /* The functions providing the interface to dictionaries.  Note that
  76    the most common parts of the interface, namely symbol lookup, are
  77    only provided via iterator functions.  */
  78
  79 /* Free the memory used by a dictionary that's not on an obstack.  (If
  80    any.)  */
  81
  82 extern void dict_free (struct dictionary *dict);
  83
  84 /* Add a symbol to an expandable dictionary.  */
  85
  86 extern void dict_add_symbol (struct dictionary *dict, struct symbol *sym);
  87
  88 /* Is the dictionary empty?  */
  89
  90 extern int dict_empty (struct dictionary *dict);
  91
  92 /* A type containing data that is used when iterating over all symbols
  93    in a dictionary.  Don't ever look at its innards; this type would
  94    be opaque if we didn't need to be able to allocate it on the
  95    stack.  */
  96
  97 struct dict_iterator
  98 {
  99   /* The dictionary that this iterator is associated to.  */
 100   const struct dictionary *dict;
 101   /* The next two members are data that is used in a way that depends
 102      on DICT's implementation type.  */
 103   int index;
 104   struct symbol *current;
 105 };
 106
 107 /* Initialize ITERATOR to point at the first symbol in DICT, and
 108    return that first symbol, or NULL if DICT is empty.  */
 109
 110 extern struct symbol *dict_iterator_first (const struct dictionary *dict,
 111                                            struct dict_iterator *iterator);
 112
 113 /* Advance ITERATOR, and return the next symbol, or NULL if there are
 114    no more symbols.  Don't call this if you've previously received
 115    NULL from dict_iterator_first or dict_iterator_next on this
 116    iteration.  */
 117
 118 extern struct symbol *dict_iterator_next (struct dict_iterator *iterator);
 119
 120 /* Initialize ITERATOR to point at the first symbol in DICT whose
 121    SYMBOL_BEST_NAME is NAME (as tested using strcmp_iw), and return
 122    that first symbol, or NULL if there are no such symbols.  */
 123
 124 extern struct symbol *dict_iter_name_first (const struct dictionary *dict,
 125                                             const char *name,
 126                                             struct dict_iterator *iterator);
 127
 128 /* Advance ITERATOR to point at the next symbol in DICT whose
 129    SYMBOL_BEST_NAME is NAME (as tested using strcmp_iw), or NULL if
 130    there are no more such symbols.  Don't call this if you've
 131    previously received NULL from dict_iterator_first or
 132    dict_iterator_next on this iteration.  And don't call it unless
 133    ITERATOR was created by a previous call to dict_iter_name_first
 134    with the same NAME.  */
 135
 136 extern struct symbol *dict_iter_name_next (const char *name,
 137                                            struct dict_iterator *iterator);
 138
 139 /* Return some notion of the size of the dictionary: the number of
 140    symbols if we have that, the number of hash buckets otherwise.  */
 141
 142 extern int dict_size (const struct dictionary *dict);
 143
 144 /* Macro to loop through all symbols in a dictionary DICT, in no
 145    particular order.  ITER is a struct dict_iterator (NOTE: __not__ a
 146    struct dict_iterator *), and SYM points to the current symbol.
 147
 148    It's implemented as a single loop, so you can terminate the loop
 149    early by a break if you desire.  */
 150
 151 #define ALL_DICT_SYMBOLS(dict, iter, sym)                       \
 152         for ((sym) = dict_iterator_first ((dict), &(iter));     \
 153              (sym);                                             \
 154              (sym) = dict_iterator_next (&(iter)))
 155
 156 #endif /* DICTIONARY_H */