+symbols_new (void)
+{
+ symbol_table = hash_initialize (HT_INITIAL_CAPACITY,
+ NULL,
+ hash_symbol_hasher,
+ hash_symbol_comparator,
+ free);
+ semantic_type_table = hash_initialize (HT_INITIAL_CAPACITY,
+ NULL,
+ hash_semantic_type_hasher,
+ hash_semantic_type_comparator,
+ free);
+}
+
+
+/*----------------------------------------------------------------.
+| Find the symbol named KEY, and return it. If it does not exist |
+| yet, create it. |
+`----------------------------------------------------------------*/
+
+symbol *
+symbol_from_uniqstr (const uniqstr key, location loc)
+{
+ symbol probe;
+ symbol *entry;
+
+ probe.tag = key;
+ entry = hash_lookup (symbol_table, &probe);
+
+ if (!entry)
+ {
+ /* First insertion in the hash. */
+ aver (!symbols_sorted);
+ entry = symbol_new (key, loc);
+ if (!hash_insert (symbol_table, entry))
+ xalloc_die ();
+ }
+ return entry;
+}
+
+
+/*-----------------------------------------------------------------------.
+| Find the semantic type named KEY, and return it. If it does not exist |
+| yet, create it. |
+`-----------------------------------------------------------------------*/
+
+semantic_type *
+semantic_type_from_uniqstr (const uniqstr key, const location *loc)
+{
+ semantic_type probe;
+ semantic_type *entry;
+
+ probe.tag = key;
+ entry = hash_lookup (semantic_type_table, &probe);
+
+ if (!entry)
+ {
+ /* First insertion in the hash. */
+ entry = semantic_type_new (key, loc);
+ if (!hash_insert (semantic_type_table, entry))
+ xalloc_die ();
+ }
+ return entry;
+}
+
+
+/*----------------------------------------------------------------.
+| Find the symbol named KEY, and return it. If it does not exist |
+| yet, create it. |
+`----------------------------------------------------------------*/
+
+symbol *
+symbol_get (const char *key, location loc)
+{
+ return symbol_from_uniqstr (uniqstr_new (key), loc);
+}
+
+
+/*-----------------------------------------------------------------------.
+| Find the semantic type named KEY, and return it. If it does not exist |
+| yet, create it. |
+`-----------------------------------------------------------------------*/
+
+semantic_type *
+semantic_type_get (const char *key, const location *loc)
+{
+ return semantic_type_from_uniqstr (uniqstr_new (key), loc);
+}
+
+
+/*------------------------------------------------------------------.
+| Generate a dummy nonterminal, whose name cannot conflict with the |
+| user's names. |
+`------------------------------------------------------------------*/
+
+symbol *
+dummy_symbol_get (location loc)
+{
+ /* Incremented for each generated symbol. */
+ static int dummy_count = 0;
+ static char buf[256];
+
+ symbol *sym;
+
+ sprintf (buf, "$@%d", ++dummy_count);
+ sym = symbol_get (buf, loc);
+ sym->class = nterm_sym;
+ sym->number = nvars++;
+ return sym;
+}
+
+bool
+symbol_is_dummy (const symbol *sym)
+{
+ return sym->tag[0] == '@' || (sym->tag[0] == '$' && sym->tag[1] == '@');
+}
+
+/*-------------------.
+| Free the symbols. |
+`-------------------*/
+
+void
+symbols_free (void)
+{
+ hash_free (symbol_table);
+ hash_free (semantic_type_table);
+ free (symbols);
+ free (symbols_sorted);
+}
+
+
+/*---------------------------------------------------------------.
+| Look for undefined symbols, report an error, and consider them |
+| terminals. |
+`---------------------------------------------------------------*/
+
+static int
+symbols_cmp (symbol const *a, symbol const *b)
+{
+ return strcmp (a->tag, b->tag);
+}
+
+static int
+symbols_cmp_qsort (void const *a, void const *b)
+{
+ return symbols_cmp (*(symbol * const *)a, *(symbol * const *)b);
+}
+
+static void
+symbols_do (Hash_processor processor, void *processor_data,
+ struct hash_table *table, symbol **sorted)
+{
+ size_t count = hash_get_n_entries (table);
+ if (!sorted)
+ {
+ sorted = xnmalloc (count, sizeof *sorted);
+ hash_get_entries (table, (void**)sorted, count);
+ qsort (sorted, count, sizeof *sorted, symbols_cmp_qsort);
+ }
+ {
+ size_t i;
+ for (i = 0; i < count; ++i)
+ processor (sorted[i], processor_data);
+ }
+}
+
+/*--------------------------------------------------------------.
+| Check that all the symbols are defined. Report any undefined |
+| symbols and consider them nonterminals. |
+`--------------------------------------------------------------*/
+
+void
+symbols_check_defined (void)
+{
+ symbols_do (symbol_check_defined_processor, NULL,
+ symbol_table, symbols_sorted);
+ symbols_do (semantic_type_check_defined_processor, NULL,
+ semantic_type_table, semantic_types_sorted);
+}
+
+/*------------------------------------------------------------------.
+| Set TOKEN_TRANSLATIONS. Check that no two symbols share the same |
+| number. |
+`------------------------------------------------------------------*/
+
+static void
+symbols_token_translations_init (void)
+{
+ bool num_256_available_p = true;
+ int i;
+
+ /* Find the highest user token number, and whether 256, the POSIX
+ preferred user token number for the error token, is used. */
+ max_user_token_number = 0;
+ for (i = 0; i < ntokens; ++i)
+ {
+ symbol *this = symbols[i];
+ if (this->user_token_number != USER_NUMBER_UNDEFINED)
+ {
+ if (this->user_token_number > max_user_token_number)
+ max_user_token_number = this->user_token_number;
+ if (this->user_token_number == 256)
+ num_256_available_p = false;
+ }
+ }
+
+ /* If 256 is not used, assign it to error, to follow POSIX. */
+ if (num_256_available_p
+ && errtoken->user_token_number == USER_NUMBER_UNDEFINED)
+ errtoken->user_token_number = 256;
+
+ /* Set the missing user numbers. */
+ if (max_user_token_number < 256)
+ max_user_token_number = 256;
+
+ for (i = 0; i < ntokens; ++i)
+ {
+ symbol *this = symbols[i];
+ if (this->user_token_number == USER_NUMBER_UNDEFINED)
+ this->user_token_number = ++max_user_token_number;
+ if (this->user_token_number > max_user_token_number)
+ max_user_token_number = this->user_token_number;
+ }
+
+ token_translations = xnmalloc (max_user_token_number + 1,
+ sizeof *token_translations);
+
+ /* Initialize all entries for literal tokens to the internal token
+ number for $undefined, which represents all invalid inputs. */
+ for (i = 0; i < max_user_token_number + 1; i++)
+ token_translations[i] = undeftoken->number;
+ symbols_do (symbol_translation_processor, NULL,
+ symbol_table, symbols_sorted);
+}
+
+
+/*----------------------------------------------------------------.
+| Assign symbol numbers, and write definition of token names into |
+| FDEFINES. Set up vectors SYMBOL_TABLE, TAGS of symbols. |
+`----------------------------------------------------------------*/
+
+void
+symbols_pack (void)
+{
+ symbols_do (symbol_check_alias_consistency_processor, NULL,
+ symbol_table, symbols_sorted);
+
+ symbols = xcalloc (nsyms, sizeof *symbols);
+ symbols_do (symbol_pack_processor, NULL, symbol_table, symbols_sorted);
+
+ /* Aliases leave empty slots in symbols, so remove them. */
+ {
+ int writei;
+ int readi;
+ int nsyms_old = nsyms;
+ for (writei = 0, readi = 0; readi < nsyms_old; readi += 1)
+ {
+ if (symbols[readi] == NULL)
+ {
+ nsyms -= 1;
+ ntokens -= 1;
+ }
+ else
+ {
+ symbols[writei] = symbols[readi];
+ symbols[writei]->number = writei;
+ if (symbols[writei]->alias)
+ symbols[writei]->alias->number = writei;
+ writei += 1;
+ }
+ }
+ }
+ symbols = xnrealloc (symbols, nsyms, sizeof *symbols);
+
+ symbols_token_translations_init ();
+
+ if (startsymbol->class == unknown_sym)
+ complain_at (startsymbol_location, fatal,
+ _("the start symbol %s is undefined"),
+ startsymbol->tag);
+ else if (startsymbol->class == token_sym)
+ complain_at (startsymbol_location, fatal,
+ _("the start symbol %s is a token"),
+ startsymbol->tag);
projects / bison.git / blobdiff