X-Git-Url: http://shamusworld.gotdns.org/cgi-bin/gitweb.cgi?p=rmac;a=blobdiff_plain;f=parmode.h;h=38f6f94b6c787f5143c40bb98cdc0e7f806c8a0f;hp=11b16bfbe81894d962029d18cf88d40a65930f77;hb=52cea8604f22cf5281dbc66fcae5fea37d038e0f;hpb=6c1bc379012b1c1ca369e71e39509f3538042382

diff --git a/parmode.h b/parmode.h
index 11b16bf..38f6f94 100644
--- a/parmode.h
+++ b/parmode.h
@@ -3,7 +3,7 @@
 // PARMODE.C - Addressing Modes Parser Include
 // Copyright (C) 199x Landon Dyer, 2011 Reboot and Friends
 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
-// Source Utilised with the Kind Permission of Landon Dyer
+// Source utilised with the kind permission of Landon Dyer
 //
 
 // This file is included (twice) to parse two addressing modes, into slightly
@@ -31,6 +31,11 @@
 
 		AMn = IMMED;
 	}
+
+	// Small problem with this is that the opening parentheses might be an
+	// expression that's part of a displacement; this code will falsely flag
+	// that as an error.
+
 	// (An)
 	// (An)+
 	// (An,Xn[.siz][*scale])
@@ -145,6 +150,15 @@
 			if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 				return ERROR;
 
+			// It could be that this is really just an expression prefixing a
+			// register as a displacement...
+			if (*tok == ')')
+			{
+				tok++;
+				goto CHK_FOR_DISPn;
+			}
+
+			// Otherwise, check for PC & etc displacements...
 			if (*tok++ != ',')
 				goto badmode;
 
@@ -223,22 +237,27 @@
 		if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 			return ERROR;
 
+CHK_FOR_DISPn:
 		if (*tok == DOTW)
-		{                                    // expr.W 
+		{
+			// expr.W 
 			tok++;
 			AMn = ABSW;
 			goto AnOK;
 		}
 		else if (*tok != '(')
-		{                              // expr[.L]
+		{
+			// expr[.L]
 			AMn = ABSL;
-			// Defined, absolute values from $FFFF8000..$00007FFF get optimized to absolute short
 
+			// Defined, absolute values from $FFFF8000..$00007FFF get optimized
+			// to absolute short
 			if ((AnEXATTR & (TDB|DEFINED)) == DEFINED && (AnEXVAL + 0x8000) < 0x10000)
 				AMn = ABSW;
 
+			// Is .L forced here?
 			if (*tok == DOTL)
-			{                                 // force .L 
+			{
 				tok++;
 				AMn = ABSL;
 			}
@@ -246,7 +265,7 @@
 			goto AnOK;
 		}
 
-		++tok;
+		tok++;
 
 		if ((*tok >= KW_A0) && (*tok <= KW_A7))
 		{
@@ -283,7 +302,7 @@
 	;
 }
 
-// Cleanup dirty little macros
+// Clean up dirty little macros
 #undef AnOK
 #undef AMn
 #undef AnREG
@@ -298,3 +317,4 @@
 #undef AnESYM
 #undef AMn_IX0
 #undef AMn_IXN
+#undef CHK_FOR_DISPn