qbe

commit 10b6fe1de74b82fa386a3ca6e49f64e801339e34
parent 4d7c42d4fb504ec71ff616b621a19bead19d362d
Author: Quentin Carbonneaux <quentin.carbonneaux@yale.edu>
Date:   Thu, 17 Sep 2015 21:12:54 -0400

add hack in emit to support stack arguments

The number stored in the .val field of SLOTs has
to be sign extended, so we can reach into the caller's
frame when necessary (arguments passed on the stack).

Diffstat:
M
lisc/emit.c
 | 
6
++++--

1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/lisc/emit.c b/lisc/emit.c
@@ -80,9 +80,11 @@ Next:
 			fprintf(f, "%%%s", rsub[ref.val][ty]);
 			break;
 		case RSlot:
-		Slot:
-			fprintf(f, "%d(%%rbp)", -4 * ref.val);
+		Slot: {
+			struct { int i:14; } x = {ref.val}; /* fixme, HACK */
+			fprintf(f, "%d(%%rbp)", -4 * x.i);
 			break;
+		}
 		case RCon:
 			fputc('$', f);
 		Con: