impc:ir:compiler:array-ref-ptr   scheme

(define impc:ir:compiler:array-ref-ptr
  (lambda (ast types)
    (let* ((os (make-string 0))
           (index-str (impc:ir:compiler (caddr ast) types))
           (idx (impc:ir:gname))
           (var-str (impc:ir:compiler (cadr ast) types))
           (var (impc:ir:gname))
           (ttype (impc:ir:get-type-from-str (cadr var))))
      ;; type tests
      (if (not (impc:ir:array? ttype))
          (impc:compiler:print-bad-type-error-with-ast (cadr var) "invalid array type" ast))
      (if (> (impc:ir:get-ptr-depth ttype) 1)
          (impc:compiler:print-compiler-error "pointer depth too great for array-set!" ast))
      (if (not (impc:ir:fixed-point? (impc:ir:get-type-from-str (cadr idx))))
          (impc:compiler:print-bad-type-error-with-ast (cadr idx) "index must be an integer" ast))
      (if (and (integer? (caddr ast)) (> (+ 1 (caddr ast)) (cadr ttype)))
          (impc:compiler:print-index-oob-error 'array ast))
      (emit index-str os)
      (emit var-str os)
      (emit "; array ref\n" os)
      (if (not (impc:ir:pointer? ttype)) ;; must be an array if we're not a pointer
          (impc:compiler:print-bad-type-error-with-ast (cadr ttype) "array-ref-ptr must take a pointer to an array" ast)
          (emit (string-append (impc:ir:gname "val" (string-append (impc:ir:get-type-str (caddr ttype)) "*"))
                               " = getelementptr " (impc:ir:pointer-- (cadr var)) ", " (cadr var) " " (car var)
                               ", i32 0, " (cadr idx) " " (car idx) "\n") os))
      (impc:ir:strip-space os))))