--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lwasm/pass6.c	Wed Jan 19 22:27:17 2011 -0700
@@ -0,0 +1,90 @@
+/*
+pass6.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 <stdio.h>
+#include <string.h>
+
+#include <lw_alloc.h>
+#include <lw_string.h>
+
+#include "lwasm.h"
+#include "instab.h"
+
+/*
+Finalize Pass
+
+Reduce all expressions in a final pass.
+
+Observation:
+
+Everything should reduce as far as it is going to in a single pass
+because all line addresses are now constant (or section-base offset)
+*/
+
+static int exprok_aux(lw_expr_t e, void *priv)
+{
+	asmstate_t *as = priv;
+	
+	if (lw_expr_istype(e, lw_expr_type_int))
+		return 0;
+	
+	if (as -> output_format == OUTPUT_OBJ)
+	{
+		if (lw_expr_istype(e, lw_expr_type_oper))
+			return 0;
+		if (lw_expr_istype(e, lw_expr_type_special) && as -> output_format == OUTPUT_OBJ)
+		{
+			int t;
+			t = lw_expr_specint(e);
+			if (t == lwasm_expr_secbase || t == lwasm_expr_syment || t == lwasm_expr_import)
+				return 0;
+		}
+	}
+	
+	return 1;
+}
+
+static int exprok(asmstate_t *as, lw_expr_t e)
+{
+	if (lw_expr_testterms(e, exprok_aux, as))
+		return 0;
+	return 1;
+}
+
+
+void do_pass6(asmstate_t *as)
+{
+	line_t *cl;
+	struct line_expr_s *le;
+
+	for (cl = as -> line_head; cl; cl = cl -> next)
+	{
+		as -> cl = cl;
+		for (le = cl -> exprs; le; le = le -> next)
+		{
+			lwasm_reduce_expr(as, le -> expr);
+			if (!exprok(as, le -> expr))
+			{
+				lwasm_register_error(as, cl, "Invalid expression");
+			}
+		}
+	}
+}