X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/965537bc543191a048b6afb2404c878f06ab877f..41930e7ad89f9a889b1c00fbd2842dded01ada1a:/src/symtab.c?ds=sidebyside

diff --git a/src/symtab.c b/src/symtab.c
index 28f49fb4..1db83f63 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;
@@ -79,8 +77,24 @@ symbol_new (uniqstr tag, location loc)
   if (nsyms == SYMBOL_NUMBER_MAXIMUM)
     fatal (_("too many symbols in input grammar (limit is %d)"),
 	   SYMBOL_NUMBER_MAXIMUM);
-  if (tag[0] != '"')
-    nsyms++;
+  nsyms++;
+  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;
+  code_props_none_init (&res->destructor);
+  code_props_none_init (&res->printer);
+
   return res;
 }
 
@@ -93,6 +107,10 @@ symbol_new (uniqstr tag, location loc)
   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)
 {
@@ -100,14 +118,15 @@ 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
 
 /*------------------------------------------------------------------.
 | Complain that S's WHAT is redeclared at SECOND, and was first set |
@@ -115,12 +134,21 @@ symbol_print (symbol *s, FILE *f)
 `------------------------------------------------------------------*/
 
 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, _("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"));
+}
+
 
 /*-----------------------------------------------------------------.
 | Set the TYPE_NAME associated with SYM.  Does nothing if passed 0 |
@@ -133,103 +161,142 @@ symbol_type_set (symbol *sym, uniqstr type_name, location loc)
   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;
     }
 }
 
+/*-----------------------------------.
+| 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)
-	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 SYM.  |
+`-----------------------------------------*/
+
+void
+symbol_destructor_set (symbol *sym, code_props const *destructor)
+{
+  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)
 {
-  /* Token 0 cannot have a %destructor unless the user renames it.  */
-  if (UNIQSTR_EQ (sym->tag, uniqstr_new ("$end")))
-    return NULL;
+  /* Per-symbol %destructor.  */
+  if (sym->destructor.code)
+    return &sym->destructor;
 
-  if (sym->destructor != NULL)
-    return sym->destructor;
-  return default_destructor;
+  /* Per-type %destructor.  */
+  if (sym->type_name)
+    {
+      code_props const *destructor =
+        &semantic_type_get (sym->type_name)->destructor;
+      if (destructor->code)
+        return destructor;
+    }
+
+  /* Apply default %destructor's only to user-defined symbols.  */
+  if (sym->tag[0] == '$' || sym == errtoken)
+    return &code_props_none;
+
+  if (sym->type_name)
+    return &default_tagged_destructor;
+  return &default_tagless_destructor;
 }
 
-/*---------------------------------------------------------------.
-| Get the grammar location of the %destructor computed for SYM.  |
-`---------------------------------------------------------------*/
+/*--------------------------------------.
+| Set the PRINTER associated with SYM.  |
+`--------------------------------------*/
 
-location
-symbol_destructor_location_get (symbol *sym)
+void
+symbol_printer_set (symbol *sym, code_props const *printer)
 {
-  if (sym->destructor != NULL)
-    return sym->destructor_location;
-  return default_destructor_location;
+  if (sym->printer.code)
+    symbol_redeclaration (sym, "%printer",
+                          sym->printer.location, printer->location);
+  sym->printer = *printer;
 }
 
-/*---------------------------------------------------------------.
-| Set the PRINTER associated with SYM.  Do nothing if passed 0.  |
-`---------------------------------------------------------------*/
+/*---------------------------------------.
+| Set the PRINTER associated with TYPE.  |
+`---------------------------------------*/
 
 void
-symbol_printer_set (symbol *sym, const char *printer, location loc)
+semantic_type_printer_set (semantic_type *type, code_props const *printer)
 {
-  if (printer)
-    {
-      if (sym->printer)
-	redeclaration (sym, "%printer", sym->printer_location, loc);
-      sym->printer = printer;
-      sym->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)
 {
-  /* Token 0 cannot have a %printer unless the user renames it.  */
-  if (UNIQSTR_EQ (sym->tag, uniqstr_new ("$end")))
-    return NULL;
+  /* Per-symbol %printer.  */
+  if (sym->printer.code)
+    return &sym->printer;
 
-  if (sym->printer != NULL)
-    return sym->printer;
-  return default_printer;
-}
+  /* Per-type %printer.  */
+  if (sym->type_name)
+    {
+      code_props const *printer = &semantic_type_get (sym->type_name)->printer;
+      if (printer->code)
+        return printer;
+    }
 
-/*------------------------------------------------------------.
-| Get the grammar location of the %printer computed for SYM.  |
-`------------------------------------------------------------*/
+  /* Apply the default %printer only to user-defined symbols.  */
+  if (sym->tag[0] == '$' || sym == errtoken)
+    return &code_props_none;
 
-location
-symbol_printer_location_get (symbol *sym)
-{
-  if (sym->printer != NULL)
-    return sym->printer_location;
-  return default_printer_location;
+  if (sym->type_name)
+    return &default_tagged_printer;
+  return &default_tagless_printer;
 }
 
-
 /*-----------------------------------------------------------------.
 | Set the PRECEDENCE associated with SYM.  Does nothing if invoked |
 | with UNDEF_ASSOC as ASSOC.                                       |
@@ -241,7 +308,8 @@ symbol_precedence_set (symbol *sym, int prec, assoc a, location loc)
   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;
@@ -267,8 +335,7 @@ symbol_class_set (symbol *sym, symbol_class class, location loc, bool declaring)
 
   if (class == nterm_sym && sym->class != nterm_sym)
     sym->number = nvars++;
-  else if (class == token_sym && sym->number == NUMBER_UNDEFINED
-           && sym->tag[0] != '"')
+  else if (class == token_sym && sym->number == NUMBER_UNDEFINED)
     sym->number = ntokens++;
 
   sym->class = class;
@@ -291,8 +358,6 @@ 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
@@ -380,9 +445,6 @@ symbol_check_alias_consistency (symbol *this)
   symbol *alias = this;
   symbol *orig  = this->alias;
 
-  if (this->tag[0] == '"' && !this->alias)
-    complain_at (this->location, _("%s undeclared"), this->tag);
-
   /* Check only those that _are_ the aliases.  */
   if (!(this->alias && this->user_token_number == USER_NUMBER_ALIAS))
     return;
@@ -396,22 +458,20 @@ 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)
@@ -457,7 +517,7 @@ 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;
 	    }
 	}
@@ -466,7 +526,7 @@ 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;
@@ -512,14 +572,15 @@ symbol_translation_processor (void *this, void *null ATTRIBUTE_UNUSED)
 }
 
 
-/*----------------------.
-| 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)
@@ -528,12 +589,25 @@ 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)
 {
@@ -541,12 +615,24 @@ 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.  |
@@ -560,6 +646,11 @@ symbols_new (void)
 				  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);
 }
 
 
@@ -587,6 +678,30 @@ symbol_from_uniqstr (const uniqstr key, location loc)
 }
 
 
+/*-----------------------------------------------------------------------.
+| 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.                                                 |
@@ -599,6 +714,18 @@ symbol_get (const char *key, location 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.                                                     |
@@ -613,13 +740,18 @@ 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++;
   return sym;
 }
 
+bool
+symbol_is_dummy (const symbol *sym)
+{
+  return sym->tag[0] == '@' || (sym->tag[0] == '$' && sym->tag[1] == '@');
+}
 
 /*-------------------.
 | Free the symbols.  |
@@ -629,6 +761,7 @@ void
 symbols_free (void)
 {
   hash_free (symbol_table);
+  hash_free (semantic_type_table);
   free (symbols);
 }
 
@@ -720,13 +853,35 @@ symbols_token_translations_init (void)
 void
 symbols_pack (void)
 {
-  symbols = xcalloc (nsyms, sizeof *symbols);
-
   symbols_do (symbol_check_alias_consistency_processor, NULL);
-  if (complaint_issued)
-    return;
+
+  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)
@@ -740,30 +895,58 @@ 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;
 }