--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lwasm/symbol.c	Wed Mar 24 21:30:31 2010 -0600
@@ -0,0 +1,87 @@
+/*
+symbol.c
+
+Copyright © 2010 William Astle
+
+This file is part of LWTOOLS.
+
+LWTOOLS 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 3 of the License, or (at your option) any later
+version.
+
+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
+this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <lw_alloc.h>
+#include <lw_expr.h>
+
+#include "lwasm.h"
+
+struct symtabe *register_symbol(asmstate_t *as, char *sym, lw_expr_t val, int flags)
+{
+	struct symtabe *se;
+	int islocal = 0;
+	int context = -1;
+	int version = -1;
+
+	if (strchr(sym, '@') || strchr(sym, '?'))
+		islocal = 1;
+	if (!(as -> pragmas & PRAGMA_DOLLARNOTLOCAL) && strchr(sym, '$'))
+		islocal = 1;
+
+	if (islocal)
+		context = as -> context;
+	
+	// first, look up symbol to see if it is already defined
+	for (se = as -> symtab.head; se; se = se -> next)
+	{
+		if (!strcmp(sym, se -> symbol))
+		{
+			if (se -> context != context)
+				continue;
+			if ((flags & symbol_flag_set) && (se -> flags & symbol_flag_set))
+			{
+				if (version < se -> version)
+					version = se -> version;
+					continue;
+			}
+			break;
+		}
+	}
+	if (se)
+	{
+		// multiply defined symbol
+		return NULL;
+	}
+
+	if (flags & symbol_flag_set)
+	{
+		version++;
+	}
+	
+	se = lw_alloc(sizeof(struct symtabe));
+	se -> next = as -> symtab.head;
+	as -> symtab.head = se;
+	se -> context = context;
+	se -> version = version;
+	se -> flags = flags;
+	se -> value = lw_expr_copy(val);
+	return se;
+}
+
+struct symtabe * lookup_symbol(asmstate_t *as, char *sym, int context, int version)
+{
+	return NULL;
+}