# HG changeset patch
# User William Astle <lost@l-w.ca>
# Date 1378140597 21600
# Node ID 210d261a614d57f0e078f8341e4e3487c6cfce90
# Parent  3c421f24c9b80c98a14960f21a21555f7cf0a93e
Make byte overflow detection for indexing work better

There are *two* places where indexed addressing is calculated - lea style
instructions and general addressing instructions. Actually check for byte
overflows in both places. Also, extend byte overflow checking to all 8 bit
offsets from index registers, not just PCR.

diff -r 3c421f24c9b8 -r 210d261a614d lwasm/insn_gen.c
--- a/lwasm/insn_gen.c	Sat Aug 31 11:46:00 2013 -0600
+++ b/lwasm/insn_gen.c	Mon Sep 02 10:49:57 2013 -0600
@@ -270,7 +270,16 @@
 	{
 		lwasm_emit(l, l -> pb);
 		if (l -> lint > 0)
+		{
+			int i;
+			i = lw_expr_intval(e);
+			if (l -> lint == 1)
+			{
+				if (i < -128 || i > 127)
+					lwasm_register_error(as, l, "Byte overflow");
+			}
 			lwasm_emitexpr(l, e, l -> lint);
+		}
 		return;
 	}
 	
diff -r 3c421f24c9b8 -r 210d261a614d lwasm/insn_indexed.c
--- a/lwasm/insn_indexed.c	Sat Aug 31 11:46:00 2013 -0600
+++ b/lwasm/insn_indexed.c	Mon Sep 02 10:49:57 2013 -0600
@@ -581,7 +581,7 @@
 {
 	lw_expr_t e;
 	
-	if (l -> lint == 1 && (l -> pb == 0x9c || l -> pb == 0x8c))
+	if (l -> lint == 1)
 	{
 		int i;
 		e = lwasm_fetch_expr(l, 0);