hash: check insertion for memory exhaustion.

[bison.git] / src / symtab.c

diff --git a/src/symtab.c b/src/symtab.c
index 8910f09c4ee0e4744f848b1aad4ec655c24e5dfe..bbd5497f5552a909a9aeb1209295808fa7b5ead4 100644 (file)
--- 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, 2007 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"
@@ -170,6 +168,23 @@ symbol_type_set (symbol *sym, uniqstr type_name, location loc)
     }
 }
 
+/*-----------------------------------.
+| Get the CLASS associated with SYM. |
+`-----------------------------------*/
+
+const char *
+symbol_class_get_string (symbol *sym)
+{
+  if (sym->class)
+    {
+      if (sym->class == token_sym)
+       return "terminal";
+      else if (sym->class == nterm_sym)
+       return "nonterminal";
+    }
+  return "unknown";
+}
+
 
 /*-----------------------------------------.
 | Set the DESTRUCTOR associated with SYM.  |
@@ -343,8 +358,6 @@ symbol_user_token_number_set (symbol *sym, int user_token_number, location loc)
 {
   int *user_token_numberp;
 
-  aver (sym->class == token_sym);
-
   if (sym->user_token_number != USER_NUMBER_ALIAS)
     user_token_numberp = &sym->user_token_number;
   else
@@ -659,7 +672,8 @@ symbol_from_uniqstr (const uniqstr key, location loc)
     {
       /* First insertion in the hash. */
       entry = symbol_new (key, loc);
-      hash_insert (symbol_table, entry);
+      if (!hash_insert (symbol_table, entry))
+        xalloc_die ();
     }
   return entry;
 }
@@ -683,7 +697,8 @@ semantic_type_from_uniqstr (const uniqstr key)
     {
       /* First insertion in the hash. */
       entry = semantic_type_new (key);
-      hash_insert (semantic_type_table, entry);
+      if (!hash_insert (semantic_type_table, entry))
+        xalloc_die ();
     }
   return entry;
 }
@@ -937,4 +952,3 @@ default_tagless_printer_set (code_props const *printer)
     }
   default_tagless_printer = *printer;
 }
-