-/* Symbol table manager for Bison,
- Copyright (C) 1984, 1989 Free Software Foundation, Inc.
+/* Symbol table manager for Bison.
-This file is part of Bison, the GNU Compiler Compiler.
+ Copyright (C) 1984, 1989, 2000-2002, 2004-2012 Free Software
+ Foundation, Inc.
-Bison 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 2, or (at your option)
-any later version.
+ This file is part of Bison, the GNU Compiler Compiler.
-Bison 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.
+ 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.
-You should have received a copy of the GNU General Public License
-along with Bison; see the file COPYING. If not, write to
-the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+ 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/>. */
+#include <config.h>
#include "system.h"
-#include "alloc.h"
-#include "symtab.h"
+
+#include <hash.h>
+
+#include "complain.h"
#include "gram.h"
+#include "symtab.h"
+/*-------------------------------------------------------------------.
+| Symbols sorted by tag. Allocated by the first invocation of |
+| symbols_do, after which no more symbols should be created. |
+`-------------------------------------------------------------------*/
-bucket *firstsymbol;
-static bucket *lastsymbol;
-static bucket **symtab;
+static symbol **symbols_sorted = NULL;
+static symbol **semantic_types_sorted = NULL;
-static int
-hash (const char *key)
+/*------------------------.
+| Distinguished symbols. |
+`------------------------*/
+
+symbol *errtoken = NULL;
+symbol *undeftoken = NULL;
+symbol *endtoken = NULL;
+symbol *accept = NULL;
+symbol *startsymbol = NULL;
+location startsymbol_location;
+
+
+/*---------------------------------.
+| Create a new symbol, named TAG. |
+`---------------------------------*/
+
+static symbol *
+symbol_new (uniqstr tag, location loc)
+{
+ symbol *res = xmalloc (sizeof *res);
+
+ uniqstr_assert (tag);
+
+ /* If the tag is not a string (starts with a double quote), check
+ that it is valid for Yacc. */
+ if (tag[0] != '\"' && tag[0] != '\'' && strchr (tag, '-'))
+ complain (&loc, Wyacc,
+ _("POSIX Yacc forbids dashes in symbol names: %s"), tag);
+
+ res->tag = tag;
+ res->location = loc;
+
+ res->type_name = NULL;
+ for (int i = 0; i < CODE_PROPS_SIZE; ++i)
+ code_props_none_init (&res->props[i]);
+
+ res->number = NUMBER_UNDEFINED;
+ res->prec = 0;
+ res->assoc = undef_assoc;
+ res->user_token_number = USER_NUMBER_UNDEFINED;
+
+ res->alias = NULL;
+ res->class = unknown_sym;
+ res->status = undeclared;
+
+ if (nsyms == SYMBOL_NUMBER_MAXIMUM)
+ complain (NULL, fatal, _("too many symbols in input grammar (limit is %d)"),
+ SYMBOL_NUMBER_MAXIMUM);
+ nsyms++;
+ return res;
+}
+
+char const *
+code_props_type_string (code_props_type kind)
+{
+ switch (kind)
+ {
+ case destructor:
+ return "%destructor";
+ case printer:
+ return "%printer";
+ }
+ assert (0);
+}
+
+/*----------------------------------------.
+| Create a new semantic type, named TAG. |
+`----------------------------------------*/
+
+static semantic_type *
+semantic_type_new (uniqstr tag, const location *loc)
+{
+ semantic_type *res = xmalloc (sizeof *res);
+
+ uniqstr_assert (tag);
+ res->tag = tag;
+ if (loc)
+ res->location = *loc;
+ for (int i = 0; i < CODE_PROPS_SIZE; ++i)
+ code_props_none_init (&res->props[i]);
+
+ return res;
+}
+
+
+/*-----------------.
+| Print a symbol. |
+`-----------------*/
+
+#define SYMBOL_ATTR_PRINT(Attr) \
+ if (s->Attr) \
+ fprintf (f, " %s { %s }", #Attr, s->Attr)
+
+#define SYMBOL_CODE_PRINT(Attr) \
+ if (s->props[Attr].code) \
+ fprintf (f, " %s { %s }", #Attr, s->props[Attr].code)
+
+void
+symbol_print (symbol const *s, FILE *f)
{
- register const char *cp;
- register int k;
+ if (s)
+ {
+ fprintf (f, "\"%s\"", s->tag);
+ SYMBOL_ATTR_PRINT (type_name);
+ SYMBOL_CODE_PRINT (destructor);
+ SYMBOL_CODE_PRINT (printer);
+ }
+ else
+ fprintf (f, "<NULL>");
+}
+
+#undef SYMBOL_ATTR_PRINT
+#undef SYMBOL_CODE_PRINT
- cp = key;
- k = 0;
- while (*cp)
- k = ((k << 1) ^ (*cp++)) & 0x3fff;
- return k % TABSIZE;
+/*----------------------------------.
+| Whether S is a valid identifier. |
+`----------------------------------*/
+
+static bool
+is_identifier (uniqstr s)
+{
+ static char const alphanum[26 + 26 + 1 + 10] =
+ "abcdefghijklmnopqrstuvwxyz"
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "_"
+ "0123456789";
+ if (!s || ! memchr (alphanum, *s, sizeof alphanum - 10))
+ return false;
+ for (++s; *s; ++s)
+ if (! memchr (alphanum, *s, sizeof alphanum))
+ return false;
+ return true;
}
+/*-----------------------------------------------.
+| Get the identifier associated to this symbol. |
+`-----------------------------------------------*/
+uniqstr
+symbol_id_get (symbol const *sym)
+{
+ aver (sym->user_token_number != USER_NUMBER_HAS_STRING_ALIAS);
+ if (sym->alias)
+ sym = sym->alias;
+ return is_identifier (sym->tag) ? sym->tag : 0;
+}
-static char *
-copys (const char *s)
+
+/*------------------------------------------------------------------.
+| Complain that S's WHAT is redeclared at SECOND, and was first set |
+| at FIRST. |
+`------------------------------------------------------------------*/
+
+static void
+symbol_redeclaration (symbol *s, const char *what, location first,
+ location second)
+{
+ unsigned i = 0;
+ complain_indent (&second, complaint, &i,
+ _("%s redeclaration for %s"), what, s->tag);
+ i += SUB_INDENT;
+ complain_indent (&first, complaint, &i,
+ _("previous declaration"));
+}
+
+static void
+semantic_type_redeclaration (semantic_type *s, const char *what, location first,
+ location second)
{
- register int i;
- register const char *cp;
- register char *result;
+ unsigned i = 0;
+ complain_indent (&second, complaint, &i,
+ _("%s redeclaration for <%s>"), what, s->tag);
+ i += SUB_INDENT;
+ complain_indent (&first, complaint, &i,
+ _("previous declaration"));
+}
+
+
- i = 1;
- for (cp = s; *cp; cp++)
- i++;
+/*-----------------------------------------------------------------.
+| Set the TYPE_NAME associated with SYM. Does nothing if passed 0 |
+| as TYPE_NAME. |
+`-----------------------------------------------------------------*/
- result = xmalloc((unsigned int)i);
- strcpy(result, s);
- return result;
+void
+symbol_type_set (symbol *sym, uniqstr type_name, location loc)
+{
+ if (type_name)
+ {
+ if (sym->type_name)
+ symbol_redeclaration (sym, "%type", sym->type_location, loc);
+ uniqstr_assert (type_name);
+ sym->type_name = type_name;
+ sym->type_location = loc;
+ }
}
+/*--------------------------------------------------------.
+| Set the DESTRUCTOR or PRINTER associated with the SYM. |
+`--------------------------------------------------------*/
void
-tabinit (void)
+symbol_code_props_set (symbol *sym, code_props_type kind,
+ code_props const *code)
{
-/* register int i; JF unused */
+ if (sym->props[kind].code)
+ symbol_redeclaration (sym, code_props_type_string (kind),
+ sym->props[kind].location,
+ code->location);
+ sym->props[kind] = *code;
+}
- symtab = NEW2(TABSIZE, bucket *);
+/*-----------------------------------------------------.
+| Set the DESTRUCTOR or PRINTER associated with TYPE. |
+`-----------------------------------------------------*/
- firstsymbol = NULL;
- lastsymbol = NULL;
+void
+semantic_type_code_props_set (semantic_type *type,
+ code_props_type kind,
+ code_props const *code)
+{
+ if (type->props[kind].code)
+ semantic_type_redeclaration (type, code_props_type_string (kind),
+ type->props[kind].location,
+ code->location);
+ type->props[kind] = *code;
}
+/*---------------------------------------------------.
+| Get the computed %destructor or %printer for SYM. |
+`---------------------------------------------------*/
-bucket *
-getsym (const char *key)
+code_props *
+symbol_code_props_get (symbol *sym, code_props_type kind)
{
- register int hashval;
- register bucket *bp;
- register int found;
+ /* Per-symbol code props. */
+ if (sym->props[kind].code)
+ return &sym->props[kind];
- hashval = hash(key);
- bp = symtab[hashval];
+ /* Per-type code props. */
+ if (sym->type_name)
+ {
+ code_props *code =
+ &semantic_type_get (sym->type_name, NULL)->props[kind];
+ if (code->code)
+ return code;
+ }
- found = 0;
- while (bp != NULL && found == 0)
+ /* Apply default code props's only to user-defined symbols. */
+ if (sym->tag[0] != '$' && sym != errtoken)
{
- if (strcmp(key, bp->tag) == 0)
- found = 1;
- else
- bp = bp->link;
+ code_props *code =
+ &semantic_type_get (sym->type_name ? "*" : "", NULL)->props[kind];
+ if (code->code)
+ return code;
}
+ return &code_props_none;
+}
- if (found == 0)
+/*-----------------------------------------------------------------.
+| Set the PRECEDENCE associated with SYM. Does nothing if invoked |
+| with UNDEF_ASSOC as ASSOC. |
+`-----------------------------------------------------------------*/
+
+void
+symbol_precedence_set (symbol *sym, int prec, assoc a, location loc)
+{
+ if (a != undef_assoc)
{
- nsyms++;
+ if (sym->prec != 0)
+ symbol_redeclaration (sym, assoc_to_string (a), sym->prec_location,
+ loc);
+ sym->prec = prec;
+ sym->assoc = a;
+ sym->prec_location = loc;
+ }
+
+ /* Only terminals have a precedence. */
+ symbol_class_set (sym, token_sym, loc, false);
+}
- bp = NEW(bucket);
- bp->link = symtab[hashval];
- bp->next = NULL;
- bp->tag = copys(key);
- bp->class = SUNKNOWN;
- if (firstsymbol == NULL)
- {
- firstsymbol = bp;
- lastsymbol = bp;
- }
+/*------------------------------------.
+| Set the CLASS associated with SYM. |
+`------------------------------------*/
+
+void
+symbol_class_set (symbol *sym, symbol_class class, location loc, bool declaring)
+{
+ bool warned = false;
+ if (sym->class != unknown_sym && sym->class != class)
+ {
+ complain (&loc, complaint, _("symbol %s redefined"), sym->tag);
+ // Don't report both "redefined" and "redeclared".
+ warned = true;
+ }
+
+ if (class == nterm_sym && sym->class != nterm_sym)
+ sym->number = nvars++;
+ else if (class == token_sym && sym->number == NUMBER_UNDEFINED)
+ sym->number = ntokens++;
+
+ sym->class = class;
+
+ if (declaring)
+ {
+ if (sym->status == declared && !warned)
+ complain (&loc, Wother, _("symbol %s redeclared"), sym->tag);
+ sym->status = declared;
+ }
+}
+
+
+/*------------------------------------------------.
+| Set the USER_TOKEN_NUMBER associated with SYM. |
+`------------------------------------------------*/
+
+void
+symbol_user_token_number_set (symbol *sym, int user_token_number, location loc)
+{
+ int *user_token_numberp;
+
+ if (sym->user_token_number != USER_NUMBER_HAS_STRING_ALIAS)
+ user_token_numberp = &sym->user_token_number;
+ else
+ user_token_numberp = &sym->alias->user_token_number;
+ if (*user_token_numberp != USER_NUMBER_UNDEFINED
+ && *user_token_numberp != user_token_number)
+ complain (&loc, complaint, _("redefining user token number of %s"),
+ sym->tag);
+
+ *user_token_numberp = user_token_number;
+ /* User defined $end token? */
+ if (user_token_number == 0)
+ {
+ endtoken = sym;
+ /* It is always mapped to 0, so it was already counted in
+ NTOKENS. */
+ if (endtoken->number != NUMBER_UNDEFINED)
+ --ntokens;
+ endtoken->number = 0;
+ }
+}
+
+
+/*----------------------------------------------------------.
+| If SYM is not defined, report an error, and consider it a |
+| nonterminal. |
+`----------------------------------------------------------*/
+
+static inline bool
+symbol_check_defined (symbol *sym)
+{
+ if (sym->class == unknown_sym)
+ {
+ assert (sym->status != declared);
+ complain (&sym->location,
+ sym->status == needed ? complaint : Wother,
+ _("symbol %s is used, but is not defined as a token"
+ " and has no rules"),
+ sym->tag);
+ sym->class = nterm_sym;
+ sym->number = nvars++;
+ }
+
+ for (int i = 0; i < 2; ++i)
+ symbol_code_props_get (sym, i)->is_used = true;
+
+ /* Set the semantic type status associated to the current symbol to
+ 'declared' so that we could check semantic types unnecessary uses. */
+ if (sym->type_name)
+ {
+ semantic_type *sem_type = semantic_type_get (sym->type_name, NULL);
+ if (sem_type)
+ sem_type->status = declared;
+ }
+
+ return true;
+}
+
+static inline bool
+semantic_type_check_defined (semantic_type *sem_type)
+{
+ // <*> and <> do not have to be "declared".
+ if (sem_type->status == declared
+ || !*sem_type->tag
+ || STREQ(sem_type->tag, "*"))
+ {
+ for (int i = 0; i < 2; ++i)
+ if (sem_type->props[i].kind != CODE_PROPS_NONE
+ && ! sem_type->props[i].is_used)
+ complain (&sem_type->location, Wother,
+ _("useless %s for type <%s>"),
+ code_props_type_string (i), sem_type->tag);
+ }
+ else
+ complain (&sem_type->location, Wother,
+ _("type <%s> is used, but is not associated to any symbol"),
+ sem_type->tag);
+
+ return true;
+}
+
+static bool
+symbol_check_defined_processor (void *sym, void *null ATTRIBUTE_UNUSED)
+{
+ return symbol_check_defined (sym);
+}
+
+static bool
+semantic_type_check_defined_processor (void *sem_type,
+ void *null ATTRIBUTE_UNUSED)
+{
+ return semantic_type_check_defined (sem_type);
+}
+
+
+void
+symbol_make_alias (symbol *sym, symbol *str, location loc)
+{
+ if (str->alias)
+ complain (&loc, Wother,
+ _("symbol %s used more than once as a literal string"), str->tag);
+ else if (sym->alias)
+ complain (&loc, Wother,
+ _("symbol %s given more than one literal string"), sym->tag);
+ else
+ {
+ str->class = token_sym;
+ str->user_token_number = sym->user_token_number;
+ sym->user_token_number = USER_NUMBER_HAS_STRING_ALIAS;
+ str->alias = sym;
+ sym->alias = str;
+ str->number = sym->number;
+ symbol_type_set (str, sym->type_name, loc);
+ }
+}
+
+
+/*---------------------------------------------------------.
+| Check that THIS, and its alias, have same precedence and |
+| associativity. |
+`---------------------------------------------------------*/
+
+static inline void
+symbol_check_alias_consistency (symbol *this)
+{
+ symbol *sym = this;
+ symbol *str = this->alias;
+
+ /* Check only the symbol in the symbol-string pair. */
+ if (!(this->alias
+ && this->user_token_number == USER_NUMBER_HAS_STRING_ALIAS))
+ return;
+
+ if (str->type_name != sym->type_name)
+ {
+ if (str->type_name)
+ symbol_type_set (sym, str->type_name, str->type_location);
else
- {
- lastsymbol->next = bp;
- lastsymbol = bp;
- }
+ symbol_type_set (str, sym->type_name, sym->type_location);
+ }
+
- symtab[hashval] = bp;
+ for (int i = 0; i < CODE_PROPS_SIZE; ++i)
+ if (str->props[i].code)
+ symbol_code_props_set (sym, i, &str->props[i]);
+ else if (sym->props[i].code)
+ symbol_code_props_set (str, i, &sym->props[i]);
+
+ if (sym->prec || str->prec)
+ {
+ if (str->prec)
+ symbol_precedence_set (sym, str->prec, str->assoc,
+ str->prec_location);
+ else
+ symbol_precedence_set (str, sym->prec, sym->assoc,
+ sym->prec_location);
}
+}
- return bp;
+static bool
+symbol_check_alias_consistency_processor (void *this,
+ void *null ATTRIBUTE_UNUSED)
+{
+ symbol_check_alias_consistency (this);
+ return true;
}
+/*-------------------------------------------------------------------.
+| Assign a symbol number, and write the definition of the token name |
+| into FDEFINES. Put in SYMBOLS. |
+`-------------------------------------------------------------------*/
+
+static inline bool
+symbol_pack (symbol *this)
+{
+ aver (this->number != NUMBER_UNDEFINED);
+ if (this->class == nterm_sym)
+ this->number += ntokens;
+ else if (this->user_token_number == USER_NUMBER_HAS_STRING_ALIAS)
+ return true;
+
+ symbols[this->number] = this;
+ return true;
+}
+
+static bool
+symbol_pack_processor (void *this, void *null ATTRIBUTE_UNUSED)
+{
+ return symbol_pack (this);
+}
+
+
+static void
+user_token_number_redeclaration (int num, symbol *first, symbol *second)
+{
+ unsigned i = 0;
+ /* User token numbers are not assigned during the parsing, but in a
+ second step, via a traversal of the symbol table sorted on tag.
+
+ However, error messages make more sense if we keep the first
+ declaration first. */
+ if (location_cmp (first->location, second->location) > 0)
+ {
+ symbol* tmp = first;
+ first = second;
+ second = tmp;
+ }
+ complain_indent (&second->location, complaint, &i,
+ _("user token number %d redeclaration for %s"),
+ num, second->tag);
+ i += SUB_INDENT;
+ complain_indent (&first->location, complaint, &i,
+ _("previous declaration for %s"),
+ first->tag);
+}
+
+/*--------------------------------------------------.
+| Put THIS in TOKEN_TRANSLATIONS if it is a token. |
+`--------------------------------------------------*/
+
+static inline bool
+symbol_translation (symbol *this)
+{
+ /* Non-terminal? */
+ if (this->class == token_sym
+ && this->user_token_number != USER_NUMBER_HAS_STRING_ALIAS)
+ {
+ /* A token which translation has already been set? */
+ if (token_translations[this->user_token_number] != undeftoken->number)
+ user_token_number_redeclaration
+ (this->user_token_number,
+ symbols[token_translations[this->user_token_number]],
+ this);
+
+ token_translations[this->user_token_number] = this->number;
+ }
+
+ return true;
+}
+
+static bool
+symbol_translation_processor (void *this, void *null ATTRIBUTE_UNUSED)
+{
+ return symbol_translation (this);
+}
+
+
+/*---------------------------------------.
+| Symbol and semantic type hash tables. |
+`---------------------------------------*/
+
+/* Initial capacity of symbol and semantic type hash table. */
+#define HT_INITIAL_CAPACITY 257
+
+static struct hash_table *symbol_table = NULL;
+static struct hash_table *semantic_type_table = NULL;
+
+static inline bool
+hash_compare_symbol (const symbol *m1, const symbol *m2)
+{
+ /* Since tags are unique, we can compare the pointers themselves. */
+ return UNIQSTR_EQ (m1->tag, m2->tag);
+}
+
+static inline bool
+hash_compare_semantic_type (const semantic_type *m1, const semantic_type *m2)
+{
+ /* Since names are unique, we can compare the pointers themselves. */
+ return UNIQSTR_EQ (m1->tag, m2->tag);
+}
+
+static bool
+hash_symbol_comparator (void const *m1, void const *m2)
+{
+ return hash_compare_symbol (m1, m2);
+}
+
+static bool
+hash_semantic_type_comparator (void const *m1, void const *m2)
+{
+ return hash_compare_semantic_type (m1, m2);
+}
+
+static inline size_t
+hash_symbol (const symbol *m, size_t tablesize)
+{
+ /* Since tags are unique, we can hash the pointer itself. */
+ return ((uintptr_t) m->tag) % tablesize;
+}
+
+static inline size_t
+hash_semantic_type (const semantic_type *m, size_t tablesize)
+{
+ /* Since names are unique, we can hash the pointer itself. */
+ return ((uintptr_t) m->tag) % tablesize;
+}
+
+static size_t
+hash_symbol_hasher (void const *m, size_t tablesize)
+{
+ return hash_symbol (m, tablesize);
+}
+
+static size_t
+hash_semantic_type_hasher (void const *m, size_t tablesize)
+{
+ return hash_semantic_type (m, tablesize);
+}
+
+/*-------------------------------.
+| Create the symbol hash table. |
+`-------------------------------*/
+
+void
+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
-free_symtab (void)
-{
- register int i;
- register bucket *bp,*bptmp;/* JF don't use ptr after free */
-
- for (i = 0; i < TABSIZE; i++)
- {
- bp = symtab[i];
- while (bp)
- {
- bptmp = bp->link;
-#if 0 /* This causes crashes because one string can appear more than once. */
- if (bp->type_name)
- FREE(bp->type_name);
-#endif
- FREE(bp);
- bp = bptmp;
- }
- }
- FREE(symtab);
+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 (&startsymbol_location, fatal,
+ _("the start symbol %s is undefined"),
+ startsymbol->tag);
+ else if (startsymbol->class == token_sym)
+ complain (&startsymbol_location, fatal,
+ _("the start symbol %s is a token"),
+ startsymbol->tag);
}
projects / bison.git / blobdiff