(primitive-set! 'make-code
  (lambda (code-size freevars)
    (unless (and (fixnum? code-size) ($fx>= code-size 0))
      (error 'make-code "~s is not a valid code size" code-size))
    (unless (and (fixnum? freevars) ($fx>= freevars 0))
      (error 'make-code "~s is not a valid number of free vars" freevars))
    (foreign-call "ikrt_make_code" code-size freevars '#())))

(primitive-set! 'code?
  (lambda (x) ($code? x)))

(primitive-set! 'code-reloc-vector
  (lambda (x)
    (unless ($code? x) (error 'code-reloc-vector "~s is not a code" x))
    ($code-reloc-vector x)))

(primitive-set! 'code-freevars
  (lambda (x)
    (unless ($code? x) (error 'code-closure-size "~s is not a code" x))
    ($code-freevars x)))

(primitive-set! 'code-size
  (lambda (x)
    (unless ($code? x) (error 'code-size "~s is not a code" x))
    ($code-size x)))

(primitive-set! 'code-set!
  (lambda (x i v)
    (unless ($code? x) (error 'code-set! "~s is not a code" x))
    (unless (and (fixnum? i)
                 ($fx>= i 0)
                 ($fx< i ($code-size x)))
      (error 'code-set! "~s is not a valid index" i))
    (unless (and (fixnum? v)
                 ($fx>= v 0)
                 ($fx< v 256))
      (error 'code-set! "~s is not a valid byte" v))
    ($code-set! x i v)))

(primitive-set! 'code-ref
  (lambda (x i)
    (unless ($code? x) (error 'code-ref "~s is not a code" x))
    (unless (and (fixnum? i)
                 ($fx>= i 0)
                 ($fx< i ($code-size x)))
      (error 'code-ref "~s is not a valid index" i))
    ($code-ref x i)))

(primitive-set! 'set-code-reloc-vector!
  (lambda (x v)
    (unless ($code? x) 
      (error 'set-code-reloc-vector! "~s is not a code" x))
    (unless (vector? v)
      (error 'set-code-reloc-vector! "~s is not a vector" v))
    (foreign-call "ikrt_set_code_reloc_vector" x v)))