X-Git-Url: http://shamusworld.gotdns.org/cgi-bin/gitweb.cgi?p=rmac;a=blobdiff_plain;f=parmode.h;h=521f787e9fe39897b4bfe5d7797fc79b3aabd7cd;hp=11b16bfbe81894d962029d18cf88d40a65930f77;hb=66be644c3e5fbd7446d86c79e9e51b75c0442b49;hpb=6c1bc379012b1c1ca369e71e39509f3538042382

diff --git a/parmode.h b/parmode.h
index 11b16bf..521f787 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])
@@ -67,21 +72,22 @@
 			}
 
 			AMn = AINDEXED;
-			goto AMn_IX0;                                      // Handle ",Xn[.siz][*scale])"
+			goto AMn_IX0;            // Handle ",Xn[.siz][*scale])"
 		}
 		else if (*tok == KW_PC)
 		{                            // (PC,Xn[.siz][*scale]) 
 			tok++;
 			AMn = PCINDEXED;
 
-			// Common index handler; enter here with `tok' pointing at the comma.
+			// Common index handler; enter here with 'tok' pointing at the
+			// comma.
 
-			AMn_IX0:                                           // Handle indexed with missing expr
+			AMn_IX0:                 // Handle indexed with missing expr
 
 			AnEXVAL = 0;
 			AnEXATTR = ABS | DEFINED;
 
-			AMn_IXN:                                           // Handle any indexed (tok -> a comma)
+			AMn_IXN:                 // Handle any indexed (tok -> a comma)
 
 			if (*tok++ != ',')
 				goto badmode;
@@ -92,7 +98,7 @@
 			AnIXREG = *tok++ & 15;
 
 			switch ((int)*tok)
-			{                                // Index reg size: <empty> | .W | .L 
+			{                        // Index reg size: <empty> | .W | .L 
 			case DOTW:
 				tok++;
 			default:
@@ -102,12 +108,12 @@
 				AnIXSIZ = 0x0800;
 				tok++;
 				break;
-			case DOTB:                                      // .B not allowed here...
+			case DOTB:               // .B not allowed here...
 				goto badmode;
 			}
 
 			if (*tok == '*')
-			{                                  // scale: *1, *2, *4, *8 
+			{                        // scale: *1, *2, *4, *8 
 				tok++;
 
 				if (*tok++ != CONST || *tok > 8)
@@ -131,7 +137,7 @@
 				}
 			}
 
-			if (*tok++ != ')')                                  // final ")" 
+			if (*tok++ != ')')         // final ")" 
 				goto badmode;
 
 			goto AnOK;
@@ -141,10 +147,19 @@
 			goto unmode;
 		}
 		else
-		{                                              // (expr... 
+		{                              // (expr... 
 			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;
 
@@ -176,7 +191,7 @@
 				}
 				else if (*tok == ')')
 				{
-					AMn = PCDISP;                                // expr(PC) 
+					AMn = PCDISP;             // expr(PC) 
 					tok++;
 					goto AnOK;
 				}
@@ -187,7 +202,7 @@
 				goto badmode;
 		}
 	}
-	else if (*tok=='-' && tok[1]=='(' && ((tok[2]>=KW_A0) && (tok[2]<=KW_A7)) && tok[3]==')')
+	else if (*tok == '-' && tok[1] == '(' && ((tok[2] >= KW_A0) && (tok[2] <= KW_A7)) && tok[3] == ')')
 	{
 		AMn = APREDEC;
 		AnREG = tok[2] & 7;
@@ -223,22 +238,36 @@
 		if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 			return ERROR;
 
+CHK_FOR_DISPn:
 		if (*tok == DOTW)
-		{                                    // expr.W 
+		{
+			// expr.W 
 			tok++;
 			AMn = ABSW;
+
+			if ((AnEXATTR & (TDB|DEFINED)) == DEFINED && (AnEXVAL < 0x10000))
+				AnEXVAL = (int32_t)(int16_t)AnEXVAL;  // Sign extend value
+
 			goto AnOK;
 		}
 		else if (*tok != '(')
-		{                              // expr[.L]
+		{
+			// expr[.L]
 			AMn = ABSL;
-			// Defined, absolute values from $FFFF8000..$00007FFF get optimized to absolute short
 
-			if ((AnEXATTR & (TDB|DEFINED)) == DEFINED && (AnEXVAL + 0x8000) < 0x10000)
+			// Defined, absolute values from $FFFF8000..$00007FFF get optimized
+			// to absolute short
+			if (optim_flag && (AnEXATTR & (TDB|DEFINED)) == DEFINED && (AnEXVAL + 0x8000) < 0x10000)
+			{
 				AMn = ABSW;
 
+				if (sbra_flag)
+					warn("absolute value from $FFFF8000..$00007FFF optimised to absolute short");
+			}
+
+			// Is .L forced here?
 			if (*tok == DOTL)
-			{                                 // force .L 
+			{
 				tok++;
 				AMn = ABSL;
 			}
@@ -246,7 +275,7 @@
 			goto AnOK;
 		}
 
-		++tok;
+		tok++;
 
 		if ((*tok >= KW_A0) && (*tok <= KW_A7))
 		{
@@ -283,7 +312,7 @@
 	;
 }
 
-// Cleanup dirty little macros
+// Clean up dirty little macros
 #undef AnOK
 #undef AMn
 #undef AnREG
@@ -298,3 +327,4 @@
 #undef AnESYM
 #undef AMn_IX0
 #undef AMn_IXN
+#undef CHK_FOR_DISPn