Added tool bison++-1.21.11

1 files changed, 147 insertions, 0 deletions

diff --git a/tools/bison++/symtab.cc b/tools/bison++/symtab.cc
new file mode 100644
index 000000000..33d3f8b5a
--- /dev/null
+++ b/tools/bison++/symtab.cc
@@ -0,0 +1,147 @@
+/* Symbol table manager for Bison,
+   Copyright (C) 1984, 1989 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
+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.
+
+Bison 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+#include <stdio.h>
+#include "system.h"
+#include "new.h"
+#include "symtab.h"
+#include "gram.h"
+
+
+bucket **symtab;
+bucket *firstsymbol;
+bucket *lastsymbol;
+
+
+
+int
+hash(char* key)
+{
+  register char *cp;
+  register int k;
+
+  cp = key;
+  k = 0;
+  while (*cp)
+    k = ((k << 1) ^ (*cp++)) & 0x3fff;
+
+  return (k % TABSIZE);
+}
+
+
+
+char *
+copys(char* s)
+{
+  register int i;
+  register char *cp;
+  register char *result;
+
+  i = 1;
+  for (cp = s; *cp; cp++)
+    i++;
+
+  result =  xmalloc((unsigned int)i);
+  strcpy(result, s);
+  return (result);
+}
+
+
+void
+tabinit()
+{
+/*   register int i; JF unused */
+
+  symtab = NEW2(TABSIZE, bucket *);
+
+  firstsymbol = NULL;
+  lastsymbol = NULL;
+}
+
+
+bucket *
+getsym(char* key)
+{
+  register int hashval;
+  register bucket *bp;
+  register int found;
+
+  hashval = hash(key);
+  bp = symtab[hashval];
+
+  found = 0;
+  while (bp != NULL && found == 0)
+    {
+      if (strcmp(key, bp->tag) == 0)
+	found = 1;
+      else
+	bp = bp->link;
+    }
+
+  if (found == 0)
+    {
+      nsyms++;
+
+      bp = NEW(bucket);
+      bp->link = symtab[hashval];
+      bp->next = NULL;
+      bp->tag = copys(key);
+      bp->internalClass = SUNKNOWN;
+
+      if (firstsymbol == NULL)
+	{
+	  firstsymbol = bp;
+	  lastsymbol = bp;
+	}
+      else
+	{
+	  lastsymbol->next = bp;
+	  lastsymbol = bp;
+	}
+
+      symtab[hashval] = bp;
+    }
+
+  return (bp);
+}
+
+
+void
+free_symtab()
+{
+  register int i;
+  register bucket *bp,*bptmp;/* JF don't use ptr after free */
+
+  for (i = 0; i < TABSIZE; i++)
+    {
+      bp = symtab[i];
+      while (bp)
+	{
+	  bptmp = bp->link;
+#if 0 /* This causes crashes because one string can appear more than once.  */
+	  if (bp->type_name)
+	    FREE(bp->type_name);
+#endif
+	  FREE(bp);
+	  bp = bptmp;
+	}
+    }
+  FREE(symtab);
+}