tests/backq.pure-cload.lisp

   1 ;;;; tests of backquote readmacro within the compiler
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5 ;;;;
   6 ;;;; While most of SBCL is derived from the CMU CL system, the test
   7 ;;;; files (like this one) were written from scratch after the fork
   8 ;;;; from CMU CL.
   9 ;;;;
  10 ;;;; This software is in the public domain and is provided with
  11 ;;;; absolutely no warranty. See the COPYING and CREDITS files for
  12 ;;;; more information.
  13
  14 ;; In the expression `(,@l1 a b ,@l2) is it preferable that we expand this
  15 ;; as (APPEND L1 (LIST* 'A 'B L2)) or as (APPEND L1 '(A) '(B) L2)?
  16 ;; The IR1 transform is designed to catch the latter case, but the expander
  17 ;; returns the former, which probably favors speed over code size.
  18 ;; This is perhaps an interesting reason to make expansion policy-sensitive.
  19 ;; I'll test a case that definitely triggers the IR1 transform.
  20
  21 (defun list-backq-expr (l1) `(,@l1 ,most-positive-fixnum a))
  22 (defun obviously-constant-list () '(#.most-positive-fixnum a))
  23
  24 (defun vector-backq-expr () `#(foo ,char-code-limit)) ; no xform, but folded
  25 (defun obviously-constant-vector () #(foo #.char-code-limit))
  26
  27 (with-test (:name :backquote-ir1-simplifier)
  28   ;; The pre-tests show that the backquoted expression did not compress
  29   ;; (,char-code-limit x) into a constant, nor for the vector.
  30   ;; Thus the IR1 optimization must do it in order for this test to pass.
  31   (assert (equal (macroexpand '`(,@l1 ,char-code-limit x))
  32                  '(APPEND l1 (LIST* char-code-limit '(X)))))
  33   (assert (equal (macroexpand '`#(,char-code-limit foo))
  34                  '(VECTOR char-code-limit 'foo)))
  35
  36   (assert (eq (obviously-constant-list) (list-backq-expr nil)))
  37
  38   ;; FIXME: do we not coalesce vector constants? I thought this should pass.
  39   #+nil
  40   (assert (eq (obviously-constant-vector) (vector-backq-expr)))
  41
  42   ;; Compiled code should reference a constant vector.
  43   (assert (member (vector 'foo char-code-limit)
  44                   (ctu:find-code-constants #'vector-backq-expr)
  45                   :test #'equalp)))