-/* Symbol table manager for Bison,
- Copyright (C) 1984, 1989, 2000, 2001, 2002 Free Software Foundation, Inc.
+/* Symbol table manager for Bison.
+
+ Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005, 2006 Free
+ Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
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. */
-
+ the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
+#include <config.h>
#include "system.h"
-#include "quotearg.h"
-#include "hash.h"
+
+#include <hash.h>
+#include <quotearg.h>
+
#include "complain.h"
-#include "symtab.h"
#include "gram.h"
+#include "symtab.h"
/*------------------------.
| Distinguished symbols. |
`------------------------*/
-symbol_t *errtoken = NULL;
-symbol_t *undeftoken = NULL;
-symbol_t *endtoken = NULL;
-symbol_t *accept = NULL;
-symbol_t *startsymbol = NULL;
-location_t startsymbol_location;
+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_t *
-symbol_new (const char *tag, location_t location)
+static symbol *
+symbol_new (uniqstr tag, location loc)
{
- symbol_t *res = XMALLOC (symbol_t, 1);
+ symbol *res = xmalloc (sizeof *res);
- res->tag = xstrdup (tag);
- res->location = location;
+ uniqstr_assert (tag);
+ res->tag = tag;
+ res->location = loc;
res->type_name = NULL;
res->destructor = NULL;
res->alias = NULL;
res->class = unknown_sym;
+ res->declared = false;
+ if (nsyms == SYMBOL_NUMBER_MAXIMUM)
+ fatal (_("too many symbols in input grammar (limit is %d)"),
+ SYMBOL_NUMBER_MAXIMUM);
nsyms++;
return res;
}
+/*-----------------.
+| Print a symbol. |
+`-----------------*/
+
+#define SYMBOL_ATTR_PRINT(Attr) \
+ if (s->Attr) \
+ fprintf (f, " %s { %s }", #Attr, s->Attr)
+
+void
+symbol_print (symbol *s, FILE *f)
+{
+ if (s)
+ {
+ fprintf (f, "\"%s\"", s->tag);
+ SYMBOL_ATTR_PRINT (type_name);
+ SYMBOL_ATTR_PRINT (destructor);
+ SYMBOL_ATTR_PRINT (printer);
+ }
+ else
+ fprintf (f, "<NULL>");
+}
+
+#undef SYMBOL_ATTR_PRINT
+
/*------------------------------------------------------------------.
-| Set the TYPE_NAME associated to SYMBOL. Does nothing if passed 0 |
-| as TYPE_NAME. |
+| Complain that S's WHAT is redeclared at SECOND, and was first set |
+| at FIRST. |
`------------------------------------------------------------------*/
+static void
+redeclaration (symbol* s, const char *what, location first, location second)
+{
+ complain_at (second, _("%s redeclaration for %s"), what, s->tag);
+ complain_at (first, _("previous declaration"));
+}
+
+
+/*-----------------------------------------------------------------.
+| Set the TYPE_NAME associated with SYM. Does nothing if passed 0 |
+| as TYPE_NAME. |
+`-----------------------------------------------------------------*/
+
void
-symbol_type_set (symbol_t *symbol, char *type_name, location_t location)
+symbol_type_set (symbol *sym, uniqstr type_name, location loc)
{
if (type_name)
{
- if (symbol->type_name)
- complain_at (location,
- _("type redeclaration for %s"), symbol->tag);
- symbol->type_name = type_name;
+ if (sym->type_name)
+ redeclaration (sym, "%type", sym->type_location, loc);
+ uniqstr_assert (type_name);
+ sym->type_name = type_name;
+ sym->type_location = loc;
}
}
-/*-------------------------------------------------------------------.
-| Set the DESTRUCTOR associated to SYMBOL. Do nothing if passed 0. |
-`-------------------------------------------------------------------*/
+/*------------------------------------------------------------------.
+| Set the DESTRUCTOR associated with SYM. Do nothing if passed 0. |
+`------------------------------------------------------------------*/
void
-symbol_destructor_set (symbol_t *symbol, char *destructor, location_t location)
+symbol_destructor_set (symbol *sym, const char *destructor, location loc)
{
if (destructor)
{
- if (symbol->destructor)
- complain_at (location,
- _("%s redeclaration for %s"),
- "%destructor", symbol->tag);
- symbol->destructor = destructor;
- symbol->destructor_location = location;
+ if (sym->destructor)
+ redeclaration (sym, "%destructor", sym->destructor_location, loc);
+ sym->destructor = destructor;
+ sym->destructor_location = loc;
}
}
-/*----------------------------------------------------------------.
-| Set the PRINTER associated to SYMBOL. Do nothing if passed 0. |
-`----------------------------------------------------------------*/
+/*---------------------------------------------------------------.
+| Set the PRINTER associated with SYM. Do nothing if passed 0. |
+`---------------------------------------------------------------*/
void
-symbol_printer_set (symbol_t *symbol, char *printer, location_t location)
+symbol_printer_set (symbol *sym, const char *printer, location loc)
{
if (printer)
{
- if (symbol->printer)
- complain_at (location,
- _("%s redeclaration for %s"),
- "%printer", symbol->tag);
- symbol->printer = printer;
- symbol->printer_location = location;
+ if (sym->printer)
+ redeclaration (sym, "%printer", sym->printer_location, loc);
+ sym->printer = printer;
+ sym->printer_location = loc;
}
}
-/*------------------------------------------------------------------.
-| Set the PRECEDENCE associated to SYMBOL. Does nothing if invoked |
-| with UNDEF_ASSOC as ASSOC. |
-`------------------------------------------------------------------*/
+/*-----------------------------------------------------------------.
+| Set the PRECEDENCE associated with SYM. Does nothing if invoked |
+| with UNDEF_ASSOC as ASSOC. |
+`-----------------------------------------------------------------*/
void
-symbol_precedence_set (symbol_t *symbol,
- int prec, assoc_t assoc, location_t location)
+symbol_precedence_set (symbol *sym, int prec, assoc a, location loc)
{
- if (assoc != undef_assoc)
+ if (a != undef_assoc)
{
- if (symbol->prec != 0)
- complain_at (location,
- _("redefining precedence of %s"),
- symbol->tag);
- symbol->prec = prec;
- symbol->assoc = assoc;
+ if (sym->prec != 0)
+ 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 (symbol, token_sym, location);
+ symbol_class_set (sym, token_sym, loc, false);
}
-/*-------------------------------------.
-| Set the CLASS associated to SYMBOL. |
-`-------------------------------------*/
+/*------------------------------------.
+| Set the CLASS associated with SYM. |
+`------------------------------------*/
void
-symbol_class_set (symbol_t *symbol, symbol_class class, location_t location)
+symbol_class_set (symbol *sym, symbol_class class, location loc, bool declaring)
{
- if (symbol->class != unknown_sym && symbol->class != class)
- complain_at (location, _("symbol %s redefined"), symbol->tag);
+ if (sym->class != unknown_sym && sym->class != class)
+ {
+ complain_at (loc, _("symbol %s redefined"), sym->tag);
+ sym->declared = false;
+ }
+
+ if (class == nterm_sym && sym->class != nterm_sym)
+ sym->number = nvars++;
+ else if (class == token_sym && sym->number == NUMBER_UNDEFINED)
+ sym->number = ntokens++;
- if (class == nterm_sym && symbol->class != nterm_sym)
- symbol->number = nvars++;
- else if (class == token_sym && symbol->number == NUMBER_UNDEFINED)
- symbol->number = ntokens++;
+ sym->class = class;
- symbol->class = class;
+ if (declaring)
+ {
+ if (sym->declared)
+ warn_at (loc, _("symbol %s redeclared"), sym->tag);
+ sym->declared = true;
+ }
}
-/*-------------------------------------------------.
-| Set the USER_TOKEN_NUMBER associated to SYMBOL. |
-`-------------------------------------------------*/
+/*------------------------------------------------.
+| Set the USER_TOKEN_NUMBER associated with SYM. |
+`------------------------------------------------*/
void
-symbol_user_token_number_set (symbol_t *symbol,
- int user_token_number, location_t location)
+symbol_user_token_number_set (symbol *sym, int user_token_number, location loc)
{
- assert (symbol->class == token_sym);
+ assert (sym->class == token_sym);
- if (symbol->user_token_number != USER_NUMBER_UNDEFINED
- && symbol->user_token_number != user_token_number)
- complain_at (location, _("redefining user token number of %s"),
- symbol->tag);
+ if (sym->user_token_number != USER_NUMBER_UNDEFINED
+ && sym->user_token_number != user_token_number)
+ complain_at (loc, _("redefining user token number of %s"), sym->tag);
- symbol->user_token_number = user_token_number;
+ sym->user_token_number = user_token_number;
/* User defined $end token? */
if (user_token_number == 0)
{
- endtoken = symbol;
+ endtoken = sym;
endtoken->number = 0;
/* It is always mapped to 0, so it was already counted in
NTOKENS. */
}
-/*------------.
-| Free THIS. |
-`------------*/
-
-static void
-symbol_free (symbol_t *this)
-{
-#if 0
- /* This causes crashes because one string can appear more
- than once. */
- XFREE (this->type_name);
-#endif
- XFREE (this->tag);
- XFREE (this);
-}
-
-
-/*-----------------------------------------------------------.
-| If THIS is not defined, report an error, and consider it a |
-| nonterminal. |
-`-----------------------------------------------------------*/
+/*----------------------------------------------------------.
+| If SYM is not defined, report an error, and consider it a |
+| nonterminal. |
+`----------------------------------------------------------*/
-static bool
-symbol_check_defined (symbol_t *this)
+static inline bool
+symbol_check_defined (symbol *sym)
{
- if (this->class == unknown_sym)
+ if (sym->class == unknown_sym)
{
complain_at
- (this->location,
+ (sym->location,
_("symbol %s is used, but is not defined as a token and has no rules"),
- this->tag);
- this->class = nterm_sym;
- this->number = nvars++;
+ sym->tag);
+ sym->class = nterm_sym;
+ sym->number = nvars++;
}
return true;
}
+static bool
+symbol_check_defined_processor (void *sym, void *null ATTRIBUTE_UNUSED)
+{
+ return symbol_check_defined (sym);
+}
-/*-------------------------------------------------------------------.
-| Declare the new SYMBOL. Make it an alias of SYMVAL, and type them |
-| with TYPENAME. |
-`-------------------------------------------------------------------*/
+
+/*------------------------------------------------------------------.
+| Declare the new symbol SYM. Make it an alias of SYMVAL, and type |
+| SYMVAL with SYM's type. |
+`------------------------------------------------------------------*/
void
-symbol_make_alias (symbol_t *symbol, symbol_t *symval, location_t loc)
+symbol_make_alias (symbol *sym, symbol *symval, location loc)
{
if (symval->alias)
warn_at (loc, _("symbol `%s' used more than once as a literal string"),
- symval->tag);
- else if (symbol->alias)
+ symval->tag);
+ else if (sym->alias)
warn_at (loc, _("symbol `%s' given more than one literal string"),
- symbol->tag);
+ sym->tag);
else
{
symval->class = token_sym;
- symval->user_token_number = symbol->user_token_number;
- symbol->user_token_number = USER_NUMBER_ALIAS;
- symval->alias = symbol;
- symbol->alias = symval;
- /* symbol and symval combined are only one symbol */
+ symval->user_token_number = sym->user_token_number;
+ sym->user_token_number = USER_NUMBER_ALIAS;
+ symval->alias = sym;
+ sym->alias = symval;
+ /* sym and symval combined are only one symbol. */
nsyms--;
ntokens--;
- assert (ntokens == symbol->number || ntokens == symval->number);
- symbol->number = symval->number =
- (symval->number < symbol->number) ? symval->number : symbol->number;
+ assert (ntokens == sym->number || ntokens == symval->number);
+ sym->number = symval->number =
+ (symval->number < sym->number) ? symval->number : sym->number;
+ symbol_type_set (symval, sym->type_name, loc);
}
}
| associativity. |
`---------------------------------------------------------*/
-static bool
-symbol_check_alias_consistence (symbol_t *this)
+static inline void
+symbol_check_alias_consistency (symbol *this)
{
- /* Check only those who _are_ the aliases. */
- if (this->alias && this->user_token_number == USER_NUMBER_ALIAS)
+ symbol *alias = this;
+ symbol *orig = this->alias;
+
+ /* Check only those that _are_ the aliases. */
+ if (!(this->alias && this->user_token_number == USER_NUMBER_ALIAS))
+ return;
+
+ if (orig->type_name != alias->type_name)
{
- if (this->prec != this->alias->prec)
- {
- if (this->prec != 0 && this->alias->prec != 0)
- complain_at (this->alias->location,
- _("conflicting precedences for %s and %s"),
- this->tag, this->alias->tag);
- if (this->prec != 0)
- this->alias->prec = this->prec;
- else
- this->prec = this->alias->prec;
- }
+ if (orig->type_name)
+ symbol_type_set (alias, orig->type_name, orig->type_location);
+ else
+ symbol_type_set (orig, alias->type_name, alias->type_location);
+ }
- if (this->assoc != this->alias->assoc)
- {
- if (this->assoc != undef_assoc && this->alias->assoc != undef_assoc)
- complain_at (this->alias->location,
- _("conflicting associativities for %s (%s) and %s (%s)"),
- this->tag, assoc_to_string (this->assoc),
- this->alias->tag, assoc_to_string (this->alias->assoc));
- if (this->assoc != undef_assoc)
- this->alias->assoc = this->assoc;
- else
- this->assoc = this->alias->assoc;
- }
+
+ if (orig->destructor || alias->destructor)
+ {
+ if (orig->destructor)
+ symbol_destructor_set (alias, orig->destructor,
+ orig->destructor_location);
+ else
+ symbol_destructor_set (orig, alias->destructor,
+ alias->destructor_location);
+ }
+
+ if (orig->printer || alias->printer)
+ {
+ if (orig->printer)
+ symbol_printer_set (alias, orig->printer, orig->printer_location);
+ else
+ symbol_printer_set (orig, alias->printer, alias->printer_location);
}
+
+ if (alias->prec || orig->prec)
+ {
+ if (orig->prec)
+ symbol_precedence_set (alias, orig->prec, orig->assoc,
+ orig->prec_location);
+ else
+ symbol_precedence_set (orig, alias->prec, alias->assoc,
+ alias->prec_location);
+ }
+}
+
+static bool
+symbol_check_alias_consistency_processor (void *this,
+ void *null ATTRIBUTE_UNUSED)
+{
+ symbol_check_alias_consistency (this);
return true;
}
| into FDEFINES. Put in SYMBOLS. |
`-------------------------------------------------------------------*/
-static bool
-symbol_pack (symbol_t *this)
+static inline bool
+symbol_pack (symbol *this)
{
if (this->class == nterm_sym)
{
return true;
}
else /* this->class == token_sym */
- {
- assert (this->number != NUMBER_UNDEFINED);
- }
+ assert (this->number != NUMBER_UNDEFINED);
symbols[this->number] = this;
return true;
}
+static bool
+symbol_pack_processor (void *this, void *null ATTRIBUTE_UNUSED)
+{
+ return symbol_pack (this);
+}
+
| Put THIS in TOKEN_TRANSLATIONS if it is a token. |
`--------------------------------------------------*/
-static bool
-symbol_translation (symbol_t *this)
+static inline bool
+symbol_translation (symbol *this)
{
/* Non-terminal? */
if (this->class == token_sym
return true;
}
+static bool
+symbol_translation_processor (void *this, void *null ATTRIBUTE_UNUSED)
+{
+ return symbol_translation (this);
+}
+
/*----------------------.
| A symbol hash table. |
static struct hash_table *symbol_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 bool
-hash_compare_symbol_t (const symbol_t *m1, const symbol_t *m2)
+hash_symbol_comparator (void const *m1, void const *m2)
{
- return strcmp (m1->tag, m2->tag) == 0;
+ return hash_compare_symbol (m1, m2);
}
-static unsigned int
-hash_symbol_t (const symbol_t *m, unsigned int tablesize)
+static inline size_t
+hash_symbol (const symbol *m, size_t tablesize)
{
- return hash_string (m->tag, tablesize);
+ /* Since tags 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);
}
{
symbol_table = hash_initialize (HT_INITIAL_CAPACITY,
NULL,
- (Hash_hasher) hash_symbol_t,
- (Hash_comparator) hash_compare_symbol_t,
- (Hash_data_freer) symbol_free);
+ hash_symbol_hasher,
+ hash_symbol_comparator,
+ free);
}
| yet, create it. |
`----------------------------------------------------------------*/
-symbol_t *
-symbol_get (const char *key, location_t location)
+symbol *
+symbol_from_uniqstr (const uniqstr key, location loc)
{
- symbol_t probe;
- symbol_t *entry;
+ symbol probe;
+ symbol *entry;
- /* Keep the symbol in a printable form. */
- key = quotearg_style (escape_quoting_style, key);
- *(char const **) &probe.tag = key;
+ probe.tag = key;
entry = hash_lookup (symbol_table, &probe);
if (!entry)
{
/* First insertion in the hash. */
- entry = symbol_new (key, location);
+ entry = symbol_new (key, loc);
hash_insert (symbol_table, entry);
}
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);
+}
+
+
/*------------------------------------------------------------------.
| Generate a dummy nonterminal, whose name cannot conflict with the |
| user's names. |
`------------------------------------------------------------------*/
-symbol_t *
-dummy_symbol_get (location_t location)
+symbol *
+dummy_symbol_get (location loc)
{
/* Incremented for each generated symbol. */
static int dummy_count = 0;
static char buf[256];
- symbol_t *sym;
+ symbol *sym;
sprintf (buf, "@%d", ++dummy_count);
- sym = symbol_get (buf, location);
+ sym = symbol_get (buf, loc);
sym->class = nterm_sym;
sym->number = nvars++;
return sym;
| terminals. |
`---------------------------------------------------------------*/
-void
-symbols_do (symbol_processor processor, void *processor_data)
+static void
+symbols_do (Hash_processor processor, void *processor_data)
{
- hash_do_for_each (symbol_table,
- (Hash_processor) processor,
- processor_data);
+ hash_do_for_each (symbol_table, processor, processor_data);
}
void
symbols_check_defined (void)
{
- symbols_do (symbol_check_defined, NULL);
+ symbols_do (symbol_check_defined_processor, NULL);
}
/*------------------------------------------------------------------.
max_user_token_number = 0;
for (i = 0; i < ntokens; ++i)
{
- symbol_t *this = symbols[i];
+ symbol *this = symbols[i];
if (this->user_token_number != USER_NUMBER_UNDEFINED)
{
if (this->user_token_number > max_user_token_number)
for (i = 0; i < ntokens; ++i)
{
- symbol_t *this = symbols[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 = XCALLOC (symbol_number_t, max_user_token_number + 1);
+ token_translations = xnmalloc (max_user_token_number + 1,
+ sizeof *token_translations);
/* Initialize all entries for literal tokens to 2, 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, NULL);
+ symbols_do (symbol_translation_processor, NULL);
}
void
symbols_pack (void)
{
- symbols = XCALLOC (symbol_t *, nsyms);
+ symbols = xcalloc (nsyms, sizeof *symbols);
- symbols_do (symbol_check_alias_consistence, NULL);
- symbols_do (symbol_pack, NULL);
+ symbols_do (symbol_check_alias_consistency_processor, NULL);
+ symbols_do (symbol_pack_processor, NULL);
symbols_token_translations_init ();
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