X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/9350499cfce9122ebb065a582ab17e321b2e8ff3..eb1b07409f0ccad9970c8a60ded9f2a56d205b9c:/src/symtab.c

diff --git a/src/symtab.c b/src/symtab.c
index 92d892a5..8910f09c 100644
--- a/src/symtab.c
+++ b/src/symtab.c
@@ -1,6 +1,6 @@
 /* Symbol table manager for Bison.
 
-   Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005, 2006 Free
+   Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005, 2006, 2007 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
@@ -41,14 +41,14 @@ 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 +64,8 @@ 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;
@@ -83,6 +83,23 @@ symbol_new (uniqstr tag, location loc)
   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;
+}
+
 
 /*-----------------.
 | Print a symbol.  |
@@ -92,6 +109,10 @@ 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)
 {
@@ -99,14 +120,15 @@ 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 |
@@ -114,12 +136,21 @@ 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 |
@@ -132,7 +163,7 @@ 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;
@@ -140,99 +171,117 @@ symbol_type_set (symbol *sym, uniqstr type_name, location loc)
 }
 
 
-/*------------------------------------------------------------------.
-| Set the DESTRUCTOR associated with SYM.  Do nothing if passed 0.  |
-`------------------------------------------------------------------*/
+/*-----------------------------------------.
+| Set the DESTRUCTOR associated with SYM.  |
+`-----------------------------------------*/
 
 void
-symbol_destructor_set (symbol *sym, const char *destructor, location loc)
+symbol_destructor_set (symbol *sym, code_props const *destructor)
 {
-  if (destructor)
-    {
-      if (sym->destructor)
-	redeclaration (sym, "%destructor", sym->destructor_location, loc);
-      sym->destructor = destructor;
-      sym->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)
+    {
+      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;
 
-  /* Apply the default %destructor only to user-defined symbols.  */
-  if (sym == errtoken || sym == undeftoken || sym == accept
-      || UNIQSTR_EQ (sym->tag, uniqstr_new ("$end")))
-    return NULL;
-  return default_destructor;
+  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)
 {
   /* Per-symbol %printer.  */
-  if (sym->printer != NULL)
-    return sym->printer;
+  if (sym->printer.code)
+    return &sym->printer;
 
-  /* Apply the default %printer only to user-defined symbols.  */
-  if (sym == errtoken || sym == undeftoken || sym == accept
-      || UNIQSTR_EQ (sym->tag, uniqstr_new ("$end")))
-    return NULL;
-  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.                                       |
@@ -244,7 +293,8 @@ 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;
@@ -293,7 +343,7 @@ symbol_user_token_number_set (symbol *sym, int user_token_number, location loc)
 {
   int *user_token_numberp;
 
-  assert (sym->class == token_sym);
+  aver (sym->class == token_sym);
 
   if (sym->user_token_number != USER_NUMBER_ALIAS)
     user_token_numberp = &sym->user_token_number;
@@ -395,22 +445,20 @@ 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)
@@ -456,7 +504,7 @@ 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;
 	    }
 	}
@@ -465,7 +513,7 @@ 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;
@@ -511,14 +559,15 @@ 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)
@@ -527,12 +576,25 @@ 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)
 {
@@ -540,12 +602,24 @@ 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.  |
@@ -559,6 +633,11 @@ 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);
 }
 
 
@@ -586,6 +665,30 @@ 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.                                                 |
@@ -598,6 +701,18 @@ 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.                                                     |
@@ -612,7 +727,7 @@ dummy_symbol_get (location loc)
 
   symbol *sym;
 
-  sprintf (buf, "@%d", ++dummy_count);
+  sprintf (buf, "$@%d", ++dummy_count);
   sym = symbol_get (buf, loc);
   sym->class = nterm_sym;
   sym->number = nvars++;
@@ -622,7 +737,7 @@ dummy_symbol_get (location loc)
 bool
 symbol_is_dummy (const symbol *sym)
 {
-  return sym->tag[0] == '@';
+  return sym->tag[0] == '@' || (sym->tag[0] == '$' && sym->tag[1] == '@');
 }
 
 /*-------------------.
@@ -633,6 +748,7 @@ void
 symbols_free (void)
 {
   hash_free (symbol_table);
+  hash_free (semantic_type_table);
   free (symbols);
 }
 
@@ -766,30 +882,59 @@ 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;
 }
+