Adjust to Autoconf 2.60 and today's gnulib.

[bison.git] / src / symtab.c

diff --git a/src/symtab.c b/src/symtab.c
index 53c9f677431b86b79d471357c40aac06869fdbf1..b71a3fbad01f961948fe028bd1970117eb33b932 100644 (file)
--- a/src/symtab.c
+++ b/src/symtab.c
@@ -1,6 +1,7 @@
 /* Symbol table manager for Bison.
 
 /* Symbol table manager for Bison.
 

-   Copyright (C) 1984, 1989, 2000, 2001, 2002 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.
 
 
    This file is part of Bison, the GNU Compiler Compiler.
 


@@ -16,10 +17,10 @@
 
    You should have received a copy of the GNU General Public License
    along with Bison; see the file COPYING.  If not, write to
 
    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 <hash.h>
 #include "system.h"
 
 #include <hash.h>


@@ -47,7 +48,7 @@ location startsymbol_location;
 static symbol *
 symbol_new (uniqstr tag, location loc)
 {
 static symbol *
 symbol_new (uniqstr tag, location loc)
 {

-  symbol *res = MALLOC (res, 1);
+  symbol *res = xmalloc (sizeof *res);

 
   uniqstr_assert (tag);
   res->tag = tag;
 
   uniqstr_assert (tag);
   res->tag = tag;


@@ -64,12 +65,53 @@ symbol_new (uniqstr tag, location loc)
 
   res->alias = NULL;
   res->class = unknown_sym;
 
   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;
 }
 
 
   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
+
+/*------------------------------------------------------------------.
+| 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.                                                    |
 /*-----------------------------------------------------------------.
 | Set the TYPE_NAME associated with SYM.  Does nothing if passed 0 |
 | as TYPE_NAME.                                                    |


@@ -81,9 +123,10 @@ symbol_type_set (symbol *sym, uniqstr type_name, location loc)
   if (type_name)
     {
       if (sym->type_name)
   if (type_name)
     {
       if (sym->type_name)

-       complain_at (loc, _("type redeclaration for %s"), sym->tag);
+       redeclaration (sym, "%type", sym->type_location, loc);

       uniqstr_assert (type_name);
       sym->type_name = type_name;
       uniqstr_assert (type_name);
       sym->type_name = type_name;

+      sym->type_location = loc;

     }
 }
 
     }
 }
 


@@ -93,13 +136,12 @@ symbol_type_set (symbol *sym, uniqstr type_name, location loc)
 `------------------------------------------------------------------*/
 
 void
 `------------------------------------------------------------------*/
 
 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)
 {
   if (destructor)
     {
       if (sym->destructor)

-       complain_at (loc, _("%s redeclaration for %s"),
-                    "%destructor", sym->tag);
+       redeclaration (sym, "%destructor", sym->destructor_location, loc);

       sym->destructor = destructor;
       sym->destructor_location = loc;
     }
       sym->destructor = destructor;
       sym->destructor_location = loc;
     }


@@ -111,13 +153,12 @@ symbol_destructor_set (symbol *sym, char *destructor, location loc)
 `---------------------------------------------------------------*/
 
 void
 `---------------------------------------------------------------*/
 
 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)
 {
   if (printer)
     {
       if (sym->printer)

-       complain_at (loc, _("%s redeclaration for %s"),
-                    "%printer", sym->tag);
+       redeclaration (sym, "%printer", sym->printer_location, loc);

       sym->printer = printer;
       sym->printer_location = loc;
     }
       sym->printer = printer;
       sym->printer_location = loc;
     }


@@ -135,13 +176,14 @@ symbol_precedence_set (symbol *sym, int prec, assoc a, location loc)
   if (a != undef_assoc)
     {
       if (sym->prec != 0)
   if (a != undef_assoc)
     {
       if (sym->prec != 0)

-       complain_at (loc, _("redefining precedence of %s"), sym->tag);
+       redeclaration (sym, assoc_to_string (a), sym->prec_location, loc);

       sym->prec = prec;
       sym->assoc = a;
       sym->prec = prec;
       sym->assoc = a;

+      sym->prec_location = loc;

     }
 
   /* Only terminals have a precedence. */
     }
 
   /* Only terminals have a precedence. */

-  symbol_class_set (sym, token_sym, loc);
+  symbol_class_set (sym, token_sym, loc, false);

 }
 
 
 }
 
 


@@ -150,10 +192,13 @@ symbol_precedence_set (symbol *sym, int prec, assoc a, location loc)
 `------------------------------------*/
 
 void
 `------------------------------------*/
 
 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)
 {
   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++;
 
   if (class == nterm_sym && sym->class != nterm_sym)
     sym->number = nvars++;


@@ -161,6 +206,13 @@ symbol_class_set (symbol *sym, symbol_class class, location loc)
     sym->number = ntokens++;
 
   sym->class = class;
     sym->number = ntokens++;
 
   sym->class = class;

+
+  if (declaring)
+    {
+      if (sym->declared)
+       warn_at (loc, _("symbol %s redeclared"), sym->tag);
+      sym->declared = true;
+    }

 }
 
 
 }
 
 


@@ -171,8 +223,7 @@ symbol_class_set (symbol *sym, symbol_class class, location loc)
 void
 symbol_user_token_number_set (symbol *sym, int user_token_number, location loc)
 {
 void
 symbol_user_token_number_set (symbol *sym, int user_token_number, location loc)
 {

-  if (sym->class != token_sym)
-    abort ();
+  assert (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_UNDEFINED
       && sym->user_token_number != user_token_number)


@@ -229,10 +280,10 @@ 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"),
 {
   if (symval->alias)
     warn_at (loc, _("symbol `%s' used more than once as a literal string"),

-         symval->tag);
+            symval->tag);

   else if (sym->alias)
     warn_at (loc, _("symbol `%s' given more than one literal string"),
   else if (sym->alias)
     warn_at (loc, _("symbol `%s' given more than one literal string"),

-         sym->tag);
+            sym->tag);

   else
     {
       symval->class = token_sym;
   else
     {
       symval->class = token_sym;


@@ -243,8 +294,7 @@ symbol_make_alias (symbol *sym, symbol *symval, location loc)
       /* sym and symval combined are only one symbol.  */
       nsyms--;
       ntokens--;
       /* sym and symval combined are only one symbol.  */
       nsyms--;
       ntokens--;

-      if (ntokens != sym->number && ntokens != symval->number)
-       abort ();
+      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);
       sym->number = symval->number =
        (symval->number < sym->number) ? symval->number : sym->number;
       symbol_type_set (symval, sym->type_name, loc);


@@ -257,45 +307,60 @@ symbol_make_alias (symbol *sym, symbol *symval, location loc)
 | associativity.                                           |
 `---------------------------------------------------------*/
 
 | associativity.                                           |
 `---------------------------------------------------------*/
 

-static inline bool
+static inline void

 symbol_check_alias_consistency (symbol *this)
 {
 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);

     }
     }

-  return true;

 }
 
 static bool
 symbol_check_alias_consistency_processor (void *this,
                                          void *null ATTRIBUTE_UNUSED)
 {
 }
 
 static bool
 symbol_check_alias_consistency_processor (void *this,
                                          void *null ATTRIBUTE_UNUSED)
 {

-  return symbol_check_alias_consistency (this);
+  symbol_check_alias_consistency (this);
+  return true;

 }
 
 
 }
 
 


@@ -322,8 +387,7 @@ symbol_pack (symbol *this)
            this->number = this->alias->number = 0;
          else
            {
            this->number = this->alias->number = 0;
          else
            {

-             if (this->alias->number == NUMBER_UNDEFINED)
-               abort ();
+             assert (this->alias->number != NUMBER_UNDEFINED);

              this->number = this->alias->number;
            }
        }
              this->number = this->alias->number;
            }
        }


@@ -332,10 +396,7 @@ symbol_pack (symbol *this)
        return true;
     }
   else /* this->class == token_sym */
        return true;
     }
   else /* this->class == token_sym */

-    {
-      if (this->number == NUMBER_UNDEFINED)
-       abort ();
-    }
+    assert (this->number != NUMBER_UNDEFINED);

 
   symbols[this->number] = this;
   return true;
 
   symbols[this->number] = this;
   return true;


@@ -403,15 +464,15 @@ hash_symbol_comparator (void const *m1, void const *m2)
   return hash_compare_symbol (m1, m2);
 }
 
   return hash_compare_symbol (m1, m2);
 }
 

-static inline unsigned int
-hash_symbol (const symbol *m, unsigned int tablesize)
+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;
 }
 
 {
   /* Since tags are unique, we can hash the pointer itself.  */
   return ((uintptr_t) m->tag) % tablesize;
 }
 

-static unsigned int
-hash_symbol_hasher (void const *m, unsigned int tablesize)
+static size_t
+hash_symbol_hasher (void const *m, size_t tablesize)

 {
   return hash_symbol (m, tablesize);
 }
 {
   return hash_symbol (m, tablesize);
 }


@@ -438,13 +499,11 @@ symbols_new (void)
 `----------------------------------------------------------------*/
 
 symbol *
 `----------------------------------------------------------------*/
 
 symbol *

-symbol_get (const char *key, location loc)
+symbol_from_uniqstr (const uniqstr key, location loc)

 {
   symbol probe;
   symbol *entry;
 
 {
   symbol probe;
   symbol *entry;
 

-  /* Keep the symbol in a printable form.  */
-  key = uniqstr_new (quotearg_style (escape_quoting_style, key));

   probe.tag = key;
   entry = hash_lookup (symbol_table, &probe);
 
   probe.tag = key;
   entry = hash_lookup (symbol_table, &probe);
 


@@ -458,6 +517,18 @@ symbol_get (const char *key, location loc)
 }
 
 
 }
 
 

+/*----------------------------------------------------------------.
+| 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.                                                     |
 /*------------------------------------------------------------------.
 | Generate a dummy nonterminal, whose name cannot conflict with the |
 | user's names.                                                     |


@@ -559,7 +630,8 @@ symbols_token_translations_init (void)
        max_user_token_number = this->user_token_number;
     }
 
        max_user_token_number = this->user_token_number;
     }
 

-  CALLOC (token_translations, 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.
 
   /* Initialize all entries for literal tokens to 2, the internal
      token number for $undefined, which represents all invalid inputs.


@@ -578,7 +650,7 @@ symbols_token_translations_init (void)
 void
 symbols_pack (void)
 {
 void
 symbols_pack (void)
 {

-  CALLOC (symbols, nsyms);
+  symbols = xcalloc (nsyms, sizeof *symbols);

 
   symbols_do (symbol_check_alias_consistency_processor, NULL);
   symbols_do (symbol_pack_processor, NULL);
 
   symbols_do (symbol_check_alias_consistency_processor, NULL);
   symbols_do (symbol_pack_processor, NULL);