X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/b2a0b7ca70f9490693d517d10c9c4a64c9fc1af0..e0c653e7e660c353c59b054de571474450aa4c92:/src/symtab.c

diff --git a/src/symtab.c b/src/symtab.c
index 4470f3a1..b65bdd48 100644
--- a/src/symtab.c
+++ b/src/symtab.c
@@ -1,24 +1,22 @@
 /* Symbol table manager for Bison.
 
-   Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005, 2006 Free
-   Software Foundation, Inc.
+   Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008
+   Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
-   Bison is free software; you can redistribute it and/or modify
+   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 2, or (at your option)
-   any later version.
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
 
-   Bison is distributed in the hope that it will be useful,
+   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 Bison; see the file COPYING.  If not, write to
-   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 #include "system.h"
@@ -41,14 +39,14 @@ symbol *accept = NULL;
 symbol *startsymbol = NULL;
 location startsymbol_location;
 
-/*-----------------------------------.
-| Default %destructor and %printer.  |
-`-----------------------------------*/
+/*---------------------------------------.
+| Default %destructor's and %printer's.  |
+`---------------------------------------*/
 
-static const char *default_destructor = NULL;
-static location default_destructor_location;
-static const char *default_printer = NULL;
-static location default_printer_location;
+static code_props default_tagged_destructor = CODE_PROPS_NONE_INIT;
+static code_props default_tagless_destructor = CODE_PROPS_NONE_INIT;
+static code_props default_tagged_printer = CODE_PROPS_NONE_INIT;
+static code_props default_tagless_printer = CODE_PROPS_NONE_INIT;
 
 /*---------------------------------.
 | Create a new symbol, named TAG.  |
@@ -64,8 +62,8 @@ symbol_new (uniqstr tag, location loc)
   res->location = loc;
 
   res->type_name = NULL;
-  res->destructor = NULL;
-  res->printer = NULL;
+  code_props_none_init (&res->destructor);
+  code_props_none_init (&res->printer);
 
   res->number = NUMBER_UNDEFINED;
   res->prec = 0;
@@ -94,8 +92,8 @@ semantic_type_new (uniqstr tag)
 
   uniqstr_assert (tag);
   res->tag = tag;
-  res->destructor = NULL;
-  res->printer = NULL;
+  code_props_none_init (&res->destructor);
+  code_props_none_init (&res->printer);
 
   return res;
 }
@@ -109,6 +107,10 @@ semantic_type_new (uniqstr tag)
   if (s->Attr)						\
     fprintf (f, " %s { %s }", #Attr, s->Attr)
 
+#define SYMBOL_CODE_PRINT(Attr)                         \
+  if (s->Attr.code)                                     \
+    fprintf (f, " %s { %s }", #Attr, s->Attr.code)
+
 void
 symbol_print (symbol *s, FILE *f)
 {
@@ -116,14 +118,50 @@ symbol_print (symbol *s, FILE *f)
     {
       fprintf (f, "\"%s\"", s->tag);
       SYMBOL_ATTR_PRINT (type_name);
-      SYMBOL_ATTR_PRINT (destructor);
-      SYMBOL_ATTR_PRINT (printer);
+      SYMBOL_CODE_PRINT (destructor);
+      SYMBOL_CODE_PRINT (printer);
     }
   else
     fprintf (f, "<NULL>");
 }
 
 #undef SYMBOL_ATTR_PRINT
+#undef SYMBOL_CODE_PRINT
+
+
+/*----------------------------------.
+| 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_ALIAS);
+  if (sym->alias)
+    sym = sym->alias;
+  return is_identifier (sym->tag) ? sym->tag : 0;
+}
+
 
 /*------------------------------------------------------------------.
 | Complain that S's WHAT is redeclared at SECOND, and was first set |
@@ -165,163 +203,135 @@ symbol_type_set (symbol *sym, uniqstr type_name, location loc)
     }
 }
 
+/*-----------------------------------.
+| Get the CLASS associated with SYM. |
+`-----------------------------------*/
 
-/*------------------------------------------------------------------.
-| Set the DESTRUCTOR associated with SYM.  Do nothing if passed 0.  |
-`------------------------------------------------------------------*/
-
-void
-symbol_destructor_set (symbol *sym, const char *destructor, location loc)
+const char *
+symbol_class_get_string (symbol *sym)
 {
-  if (destructor)
+  if (sym->class)
     {
-      if (sym->destructor)
-	symbol_redeclaration (sym, "%destructor", sym->destructor_location,
-                              loc);
-      sym->destructor = destructor;
-      sym->destructor_location = loc;
+      if (sym->class == token_sym)
+	return "terminal";
+      else if (sym->class == nterm_sym)
+	return "nonterminal";
     }
+  return "unknown";
 }
 
-/*-------------------------------------------------------------------.
-| Set the DESTRUCTOR associated with TYPE.  Do nothing if passed 0.  |
-`-------------------------------------------------------------------*/
+
+/*-----------------------------------------.
+| Set the DESTRUCTOR associated with SYM.  |
+`-----------------------------------------*/
 
 void
-semantic_type_destructor_set (semantic_type *type, const char *destructor,
-                              location loc)
+symbol_destructor_set (symbol *sym, code_props const *destructor)
 {
-  if (destructor)
-    {
-      if (type->destructor)
-	semantic_type_redeclaration (type, "%destructor",
-                                     type->destructor_location, loc);
-      type->destructor = destructor;
-      type->destructor_location = loc;
-    }
+  if (sym->destructor.code)
+    symbol_redeclaration (sym, "%destructor", sym->destructor.location,
+                          destructor->location);
+  sym->destructor = *destructor;
+}
+
+/*------------------------------------------.
+| Set the DESTRUCTOR associated with TYPE.  |
+`------------------------------------------*/
+
+void
+semantic_type_destructor_set (semantic_type *type,
+                              code_props const *destructor)
+{
+  if (type->destructor.code)
+    semantic_type_redeclaration (type, "%destructor",
+                                 type->destructor.location,
+                                 destructor->location);
+  type->destructor = *destructor;
 }
 
 /*---------------------------------------.
 | Get the computed %destructor for SYM.  |
 `---------------------------------------*/
 
-const char *
-symbol_destructor_get (symbol *sym)
+code_props const *
+symbol_destructor_get (symbol const *sym)
 {
   /* Per-symbol %destructor.  */
-  if (sym->destructor != NULL)
-    return sym->destructor;
+  if (sym->destructor.code)
+    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;
+      code_props const *destructor =
+        &semantic_type_get (sym->type_name)->destructor;
+      if (destructor->code)
+        return destructor;
     }
 
-  /* Apply the default %destructor only to user-defined symbols.  */
+  /* Apply default %destructor's 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.  |
-`---------------------------------------------------------------*/
+    return &code_props_none;
 
-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;
+    return &default_tagged_destructor;
+  return &default_tagless_destructor;
 }
 
-/*---------------------------------------------------------------.
-| Set the PRINTER associated with SYM.  Do nothing if passed 0.  |
-`---------------------------------------------------------------*/
+/*--------------------------------------.
+| Set the PRINTER associated with SYM.  |
+`--------------------------------------*/
 
 void
-symbol_printer_set (symbol *sym, const char *printer, location loc)
+symbol_printer_set (symbol *sym, code_props const *printer)
 {
-  if (printer)
-    {
-      if (sym->printer)
-	symbol_redeclaration (sym, "%printer", sym->printer_location, loc);
-      sym->printer = printer;
-      sym->printer_location = loc;
-    }
+  if (sym->printer.code)
+    symbol_redeclaration (sym, "%printer",
+                          sym->printer.location, printer->location);
+  sym->printer = *printer;
 }
 
-/*----------------------------------------------------------------.
-| Set the PRINTER associated with TYPE.  Do nothing if passed 0.  |
-`----------------------------------------------------------------*/
+/*---------------------------------------.
+| Set the PRINTER associated with TYPE.  |
+`---------------------------------------*/
 
 void
-semantic_type_printer_set (semantic_type *type, const char *printer,
-                           location loc)
+semantic_type_printer_set (semantic_type *type, code_props const *printer)
 {
-  if (printer)
-    {
-      if (type->printer)
-	semantic_type_redeclaration (type, "%printer", type->printer_location,
-                                     loc);
-      type->printer = printer;
-      type->printer_location = loc;
-    }
+  if (type->printer.code)
+    semantic_type_redeclaration (type, "%printer",
+                                 type->printer.location, printer->location);
+  type->printer = *printer;
 }
 
 /*------------------------------------.
 | Get the computed %printer for SYM.  |
 `------------------------------------*/
 
-const char *
-symbol_printer_get (symbol *sym)
+code_props const *
+symbol_printer_get (symbol const *sym)
 {
   /* Per-symbol %printer.  */
-  if (sym->printer != NULL)
-    return sym->printer;
+  if (sym->printer.code)
+    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;
+      code_props const *printer = &semantic_type_get (sym->type_name)->printer;
+      if (printer->code)
+        return 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.  |
-`------------------------------------------------------------*/
+    return &code_props_none;
 
-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;
+    return &default_tagged_printer;
+  return &default_tagless_printer;
 }
 
-
 /*-----------------------------------------------------------------.
 | Set the PRECEDENCE associated with SYM.  Does nothing if invoked |
 | with UNDEF_ASSOC as ASSOC.                                       |
@@ -383,8 +393,6 @@ symbol_user_token_number_set (symbol *sym, int user_token_number, location loc)
 {
   int *user_token_numberp;
 
-  assert (sym->class == token_sym);
-
   if (sym->user_token_number != USER_NUMBER_ALIAS)
     user_token_numberp = &sym->user_token_number;
   else
@@ -485,22 +493,20 @@ symbol_check_alias_consistency (symbol *this)
     }
 
 
-  if (orig->destructor || alias->destructor)
+  if (orig->destructor.code || alias->destructor.code)
     {
-      if (orig->destructor)
-	symbol_destructor_set (alias, orig->destructor,
-			       orig->destructor_location);
+      if (orig->destructor.code)
+	symbol_destructor_set (alias, &orig->destructor);
       else
-	symbol_destructor_set (orig, alias->destructor,
-			       alias->destructor_location);
+	symbol_destructor_set (orig, &alias->destructor);
     }
 
-  if (orig->printer || alias->printer)
+  if (orig->printer.code || alias->printer.code)
     {
-      if (orig->printer)
-	symbol_printer_set (alias, orig->printer, orig->printer_location);
+      if (orig->printer.code)
+	symbol_printer_set (alias, &orig->printer);
       else
-	symbol_printer_set (orig, alias->printer, alias->printer_location);
+	symbol_printer_set (orig, &alias->printer);
     }
 
   if (alias->prec || orig->prec)
@@ -546,7 +552,7 @@ symbol_pack (symbol *this)
 	    this->number = this->alias->number = 0;
 	  else
 	    {
-	      assert (this->alias->number != NUMBER_UNDEFINED);
+	      aver (this->alias->number != NUMBER_UNDEFINED);
 	      this->number = this->alias->number;
 	    }
 	}
@@ -555,7 +561,7 @@ symbol_pack (symbol *this)
 	return true;
     }
   else /* this->class == token_sym */
-    assert (this->number != NUMBER_UNDEFINED);
+    aver (this->number != NUMBER_UNDEFINED);
 
   symbols[this->number] = this;
   return true;
@@ -769,7 +775,7 @@ dummy_symbol_get (location loc)
 
   symbol *sym;
 
-  sprintf (buf, "@%d", ++dummy_count);
+  sprintf (buf, "$@%d", ++dummy_count);
   sym = symbol_get (buf, loc);
   sym->class = nterm_sym;
   sym->number = nvars++;
@@ -779,7 +785,7 @@ dummy_symbol_get (location loc)
 bool
 symbol_is_dummy (const symbol *sym)
 {
-  return sym->tag[0] == '@';
+  return sym->tag[0] == '@' || (sym->tag[0] == '$' && sym->tag[1] == '@');
 }
 
 /*-------------------.
@@ -865,9 +871,8 @@ symbols_token_translations_init (void)
   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 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);
@@ -924,30 +929,58 @@ symbols_pack (void)
 }
 
 
-/*-----------------------------------.
-| Set default %destructor/%printer.  |
-`-----------------------------------*/
+/*--------------------------------------------------.
+| Set default tagged/tagless %destructor/%printer.  |
+`--------------------------------------------------*/
+
+void
+default_tagged_destructor_set (code_props const *destructor)
+{
+  if (default_tagged_destructor.code)
+    {
+      complain_at (destructor->location,
+                   _("redeclaration for default tagged %%destructor"));
+      complain_at (default_tagged_destructor.location,
+		   _("previous declaration"));
+    }
+  default_tagged_destructor = *destructor;
+}
+
+void
+default_tagless_destructor_set (code_props const *destructor)
+{
+  if (default_tagless_destructor.code)
+    {
+      complain_at (destructor->location,
+                   _("redeclaration for default tagless %%destructor"));
+      complain_at (default_tagless_destructor.location,
+		   _("previous declaration"));
+    }
+  default_tagless_destructor = *destructor;
+}
 
 void
-default_destructor_set (const char *destructor, location loc)
+default_tagged_printer_set (code_props const *printer)
 {
-  if (default_destructor != NULL)
+  if (default_tagged_printer.code)
     {
-      complain_at (loc, _("redeclaration for default %%destructor"));
-      complain_at (default_destructor_location, _("previous declaration"));
+      complain_at (printer->location,
+                   _("redeclaration for default tagged %%printer"));
+      complain_at (default_tagged_printer.location,
+		   _("previous declaration"));
     }
-  default_destructor = destructor;
-  default_destructor_location = loc;
+  default_tagged_printer = *printer;
 }
 
 void
-default_printer_set (const char *printer, location loc)
+default_tagless_printer_set (code_props const *printer)
 {
-  if (default_printer != NULL)
+  if (default_tagless_printer.code)
     {
-      complain_at (loc, _("redeclaration for default %%printer"));
-      complain_at (default_printer_location, _("previous declaration"));
+      complain_at (printer->location,
+                   _("redeclaration for default tagless %%printer"));
+      complain_at (default_tagless_printer.location,
+		   _("previous declaration"));
     }
-  default_printer = printer;
-  default_printer_location = loc;
+  default_tagless_printer = *printer;
 }