From 0c40996d3617183272518960d1b63f2b83c76f05 Mon Sep 17 00:00:00 2001
From: Luke Lau <luke_lau@icloud.com>
Date: Wed, 17 Jul 2019 23:23:16 +0100
Subject: [PATCH] Fix up codegen-add for vars

---
 compiler.scm | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/compiler.scm b/compiler.scm
index d79a37a..76fa671 100644
--- a/compiler.scm
+++ b/compiler.scm
@@ -6,12 +6,17 @@
     (apply printf s)
     (display "\n")))
 
-(define (codegen-add xs)
+(define (codegen-add xs si env)
   (define (go ys)
     (if (null? ys)
       (emit "movq %rbx, %rax")
       (begin
-	(emit "addq $~a, %rbx" (car ys))
+	(let ((y (car ys)))
+	     (if (integer? y)
+		 (emit "addq $~a, %rbx" y)
+		 (begin
+		   (codegen-expr y si env)
+		   (emit "addq %rax, %rbx"))))
 	(go (cdr ys)))))
   (begin
     (emit "movq $0, %rbx")
@@ -43,7 +48,7 @@
 
 (define (codegen-expr e si env)
   (cond ((and (list? e) (eq? (car e) '+))
-	 (codegen-add (cdr e)))
+	 (codegen-add (cdr e) si env))
 	((let? e) (codegen-let
 		   (let-bindings e)
 		   (let-body e)
-- 
2.30.2