diff options
Diffstat (limited to 'module/language/assembly/compile-bytecode.scm')
-rw-r--r-- | module/language/assembly/compile-bytecode.scm | 5 |
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)) |