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-rw-r--r--module/language/assembly/compile-bytecode.scm5
1 files changed, 4 insertions, 1 deletions
diff --git a/module/language/assembly/compile-bytecode.scm b/module/language/assembly/compile-bytecode.scm
index d17e00f2f..80dee833a 100644
--- a/module/language/assembly/compile-bytecode.scm
+++ b/module/language/assembly/compile-bytecode.scm
@@ -77,7 +77,10 @@
;; Ew!
(for-each write-byte (bytevector->u8-list bv)))
(define (write-break label)
- (write-uint16-be (- (assq-ref labels label) (+ (get-addr) 2))))
+ (let ((offset (- (assq-ref labels label) (+ (get-addr) 2))))
+ (cond ((>= offset (ash 1 15)) (error "jump too big" offset))
+ ((< offset (- (ash 1 15))) (error "reverse jump too big" offset))
+ (else (write-uint16-be offset)))))
(let ((inst (car asm))
(args (cdr asm))