/* Symbol table manager for Bison.
- Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005 Free Software
- Foundation, Inc.
+ Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005, 2006 Free
+ Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
-
+#include <config.h>
#include "system.h"
#include <hash.h>
symbol *startsymbol = NULL;
location startsymbol_location;
+/*-----------------------------------.
+| Default %destructor and %printer. |
+`-----------------------------------*/
+
+static const char *default_destructor = NULL;
+static location default_destructor_location;
+static const char *default_printer = NULL;
+static location default_printer_location;
+
/*---------------------------------.
| Create a new symbol, named TAG. |
`---------------------------------*/
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)"),
return res;
}
+/*----------------------------------------.
+| Create a new semantic type, named TAG. |
+`----------------------------------------*/
+
+static semantic_type *
+semantic_type_new (uniqstr tag)
+{
+ semantic_type *res = xmalloc (sizeof *res);
+
+ uniqstr_assert (tag);
+ res->tag = tag;
+ res->destructor = NULL;
+ res->printer = NULL;
+
+ return res;
+}
+
/*-----------------.
| Print a symbol. |
void
symbol_print (symbol *s, FILE *f)
{
- fprintf (f, "\"%s\"", s->tag);
- SYMBOL_ATTR_PRINT (type_name);
- SYMBOL_ATTR_PRINT (destructor);
- SYMBOL_ATTR_PRINT (printer);
+ 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
`------------------------------------------------------------------*/
static void
-redeclaration (symbol* s, const char *what, location first, location second)
+symbol_redeclaration (symbol *s, const char *what, location first,
+ location second)
{
complain_at (second, _("%s redeclaration for %s"), what, s->tag);
- complain_at (first, _("first declaration"));
+ complain_at (first, _("previous declaration"));
+}
+
+static void
+semantic_type_redeclaration (semantic_type *s, const char *what, location first,
+ location second)
+{
+ complain_at (second, _("%s redeclaration for <%s>"), what, s->tag);
+ complain_at (first, _("previous declaration"));
}
if (type_name)
{
if (sym->type_name)
- redeclaration (sym, "%type", sym->type_location, loc);
+ symbol_redeclaration (sym, "%type", sym->type_location, loc);
uniqstr_assert (type_name);
sym->type_name = type_name;
sym->type_location = loc;
`------------------------------------------------------------------*/
void
-symbol_destructor_set (symbol *sym, char *destructor, location loc)
+symbol_destructor_set (symbol *sym, const char *destructor, location loc)
{
if (destructor)
{
if (sym->destructor)
- redeclaration (sym, "%destructor", sym->destructor_location, loc);
+ symbol_redeclaration (sym, "%destructor", sym->destructor_location,
+ loc);
sym->destructor = destructor;
sym->destructor_location = loc;
}
}
+/*-------------------------------------------------------------------.
+| Set the DESTRUCTOR associated with TYPE. Do nothing if passed 0. |
+`-------------------------------------------------------------------*/
+
+void
+semantic_type_destructor_set (semantic_type *type, const char *destructor,
+ location loc)
+{
+ if (destructor)
+ {
+ if (type->destructor)
+ semantic_type_redeclaration (type, "%destructor",
+ type->destructor_location, loc);
+ type->destructor = destructor;
+ type->destructor_location = loc;
+ }
+}
+
+/*---------------------------------------.
+| Get the computed %destructor for SYM. |
+`---------------------------------------*/
+
+const char *
+symbol_destructor_get (symbol *sym)
+{
+ /* Per-symbol %destructor. */
+ if (sym->destructor != NULL)
+ return sym->destructor;
+
+ /* Per-type %destructor. */
+ if (sym->type_name)
+ {
+ semantic_type *type = semantic_type_get (sym->type_name);
+ if (type->destructor)
+ return type->destructor;
+ }
+
+ /* Apply the default %destructor only to user-defined symbols. */
+ if (sym->tag[0] == '$' || sym == errtoken)
+ return NULL;
+ return default_destructor;
+}
+
+/*---------------------------------------------------------------.
+| Get the grammar location of the %destructor computed for SYM. |
+`---------------------------------------------------------------*/
+
+location
+symbol_destructor_location_get (symbol *sym)
+{
+ if (sym->destructor != NULL)
+ return sym->destructor_location;
+ if (sym->type_name)
+ {
+ semantic_type *type = semantic_type_get (sym->type_name);
+ if (type->destructor)
+ return type->destructor_location;
+ }
+ return default_destructor_location;
+}
/*---------------------------------------------------------------.
| Set the PRINTER associated with SYM. Do nothing if passed 0. |
`---------------------------------------------------------------*/
void
-symbol_printer_set (symbol *sym, char *printer, location loc)
+symbol_printer_set (symbol *sym, const char *printer, location loc)
{
if (printer)
{
if (sym->printer)
- redeclaration (sym, "%printer", sym->destructor_location, loc);
+ symbol_redeclaration (sym, "%printer", sym->printer_location, loc);
sym->printer = printer;
sym->printer_location = loc;
}
}
+/*----------------------------------------------------------------.
+| Set the PRINTER associated with TYPE. Do nothing if passed 0. |
+`----------------------------------------------------------------*/
+
+void
+semantic_type_printer_set (semantic_type *type, const char *printer,
+ location loc)
+{
+ if (printer)
+ {
+ if (type->printer)
+ semantic_type_redeclaration (type, "%printer", type->printer_location,
+ loc);
+ type->printer = printer;
+ type->printer_location = loc;
+ }
+}
+
+/*------------------------------------.
+| Get the computed %printer for SYM. |
+`------------------------------------*/
+
+const char *
+symbol_printer_get (symbol *sym)
+{
+ /* Per-symbol %printer. */
+ if (sym->printer != NULL)
+ return sym->printer;
+
+ /* Per-type %printer. */
+ if (sym->type_name)
+ {
+ semantic_type *type = semantic_type_get (sym->type_name);
+ if (type->printer)
+ return type->printer;
+ }
+
+ /* Apply the default %printer only to user-defined symbols. */
+ if (sym->tag[0] == '$' || sym == errtoken)
+ return NULL;
+ return default_printer;
+}
+
+/*------------------------------------------------------------.
+| Get the grammar location of the %printer computed for SYM. |
+`------------------------------------------------------------*/
+
+location
+symbol_printer_location_get (symbol *sym)
+{
+ if (sym->printer != NULL)
+ return sym->printer_location;
+ if (sym->type_name)
+ {
+ semantic_type *type = semantic_type_get (sym->type_name);
+ if (type->printer)
+ return type->printer_location;
+ }
+ return default_printer_location;
+}
+
/*-----------------------------------------------------------------.
| Set the PRECEDENCE associated with SYM. Does nothing if invoked |
if (a != undef_assoc)
{
if (sym->prec != 0)
- redeclaration (sym, assoc_to_string (a), sym->prec_location, loc);
+ 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);
+ symbol_class_set (sym, token_sym, loc, false);
}
`------------------------------------*/
void
-symbol_class_set (symbol *sym, symbol_class class, location loc)
+symbol_class_set (symbol *sym, symbol_class class, location loc, bool declaring)
{
if (sym->class != unknown_sym && sym->class != class)
- complain_at (loc, _("symbol %s redefined"), sym->tag);
+ {
+ complain_at (loc, _("symbol %s redefined"), sym->tag);
+ sym->declared = false;
+ }
if (class == nterm_sym && sym->class != nterm_sym)
sym->number = nvars++;
sym->number = ntokens++;
sym->class = class;
+
+ if (declaring)
+ {
+ if (sym->declared)
+ warn_at (loc, _("symbol %s redeclared"), sym->tag);
+ sym->declared = true;
+ }
}
void
symbol_user_token_number_set (symbol *sym, int user_token_number, location loc)
{
- if (sym->class != token_sym)
- abort ();
+ int *user_token_numberp;
+
+ aver (sym->class == token_sym);
- if (sym->user_token_number != USER_NUMBER_UNDEFINED
- && sym->user_token_number != user_token_number)
+ if (sym->user_token_number != USER_NUMBER_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_at (loc, _("redefining user token number of %s"), sym->tag);
- sym->user_token_number = user_token_number;
+ *user_token_numberp = user_token_number;
/* User defined $end token? */
if (user_token_number == 0)
{
sym->user_token_number = USER_NUMBER_ALIAS;
symval->alias = sym;
sym->alias = symval;
- /* sym and symval combined are only one symbol. */
- nsyms--;
- ntokens--;
- if (ntokens != sym->number && ntokens != symval->number)
- abort ();
- sym->number = symval->number =
- (symval->number < sym->number) ? symval->number : sym->number;
+ symval->number = sym->number;
symbol_type_set (symval, sym->type_name, loc);
}
}
this->number = this->alias->number = 0;
else
{
- if (this->alias->number == NUMBER_UNDEFINED)
- abort ();
+ aver (this->alias->number != NUMBER_UNDEFINED);
this->number = this->alias->number;
}
}
return true;
}
else /* this->class == token_sym */
- {
- if (this->number == NUMBER_UNDEFINED)
- abort ();
- }
+ aver (this->number != NUMBER_UNDEFINED);
symbols[this->number] = this;
return true;
}
-/*----------------------.
-| A symbol hash table. |
-`----------------------*/
+/*---------------------------------------.
+| Symbol and semantic type hash tables. |
+`---------------------------------------*/
-/* Initial capacity of symbols hash table. */
+/* 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)
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)
{
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. |
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);
}
`----------------------------------------------------------------*/
symbol *
-symbol_get (const char *key, location loc)
+symbol_from_uniqstr (const uniqstr key, location loc)
{
symbol probe;
symbol *entry;
- key = uniqstr_new (key);
probe.tag = key;
entry = hash_lookup (symbol_table, &probe);
}
+/*-----------------------------------------------------------------------.
+| 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)
+{
+ 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);
+ hash_insert (semantic_type_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);
+}
+
+
+/*-----------------------------------------------------------------------.
+| 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)
+{
+ return semantic_type_from_uniqstr (uniqstr_new (key));
+}
+
+
/*------------------------------------------------------------------.
| Generate a dummy nonterminal, whose name cannot conflict with the |
| user's names. |
symbol *sym;
- sprintf (buf, "@%d", ++dummy_count);
+ 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. |
symbols_free (void)
{
hash_free (symbol_table);
+ hash_free (semantic_type_table);
free (symbols);
}
void
symbols_pack (void)
{
- symbols = xcalloc (nsyms, sizeof *symbols);
-
symbols_do (symbol_check_alias_consistency_processor, NULL);
+
+ symbols = xcalloc (nsyms, sizeof *symbols);
symbols_do (symbol_pack_processor, NULL);
+ /* 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)
_("the start symbol %s is a token"),
startsymbol->tag);
}
+
+
+/*-----------------------------------.
+| Set default %destructor/%printer. |
+`-----------------------------------*/
+
+void
+default_destructor_set (const char *destructor, location loc)
+{
+ if (default_destructor != NULL)
+ {
+ complain_at (loc, _("redeclaration for default %%destructor"));
+ complain_at (default_destructor_location, _("previous declaration"));
+ }
+ default_destructor = destructor;
+ default_destructor_location = loc;
+}
+
+void
+default_printer_set (const char *printer, location loc)
+{
+ if (default_printer != NULL)
+ {
+ complain_at (loc, _("redeclaration for default %%printer"));
+ complain_at (default_printer_location, _("previous declaration"));
+ }
+ default_printer = printer;
+ default_printer_location = loc;
+}
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