tests/dynamic-extent.impure.lisp

   1 ;;;; tests that dynamic-extent functionality works.
   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 (when (eq sb-ext:*evaluator-mode* :interpret)
  15   (sb-ext:quit :unix-status 104))
  16
  17 (setq sb-c::*check-consistency* t)
  18
  19 (defmacro defun-with-dx (name arglist &body body)
  20   `(locally
  21      (declare (optimize sb-c::stack-allocate-dynamic-extent))
  22      (defun ,name ,arglist
  23        ,@body)))
  24
  25 (declaim (notinline opaque-identity))
  26 (defun opaque-identity (x)
  27   x)
  28
  29 ;;; &REST lists
  30 (defun-with-dx dxlength (&rest rest)
  31   (declare (dynamic-extent rest))
  32   (length rest))
  33
  34 (assert (= (dxlength 1 2 3) 3))
  35 (assert (= (dxlength t t t t t t) 6))
  36 (assert (= (dxlength) 0))
  37
  38 (defun callee (list)
  39   (destructuring-bind (a b c d e f &rest g) list
  40     (+ a b c d e f (length g))))
  41
  42 (defun-with-dx dxcaller (&rest rest)
  43   (declare (dynamic-extent rest))
  44   (callee rest))
  45 (assert (= (dxcaller 1 2 3 4 5 6 7) 22))
  46
  47 (defun-with-dx dxcaller-align-1 (x &rest rest)
  48   (declare (dynamic-extent rest))
  49   (+ x (callee rest)))
  50 (assert (= (dxcaller-align-1 17 1 2 3 4 5 6 7) 39))
  51 (assert (= (dxcaller-align-1 17 1 2 3 4 5 6 7 8) 40))
  52
  53 ;;; %NIP-VALUES
  54 (defun-with-dx test-nip-values ()
  55   (flet ((bar (x &rest y)
  56            (declare (dynamic-extent y))
  57            (if (> x 0)
  58                (values x (length y))
  59                (values (car y)))))
  60     (multiple-value-call #'values
  61       (bar 1 2 3 4 5 6)
  62       (bar -1 'a 'b))))
  63
  64 (assert (equal (multiple-value-list (test-nip-values)) '(1 5 a)))
  65
  66 ;;; LET-variable substitution
  67 (defun-with-dx test-let-var-subst1 (x)
  68   (let ((y (list x (1- x))))
  69     (opaque-identity :foo)
  70     (let ((z (the list y)))
  71       (declare (dynamic-extent z))
  72       (length z))))
  73 (assert (eql (test-let-var-subst1 17) 2))
  74
  75 (defun-with-dx test-let-var-subst2 (x)
  76   (let ((y (list x (1- x))))
  77     (declare (dynamic-extent y))
  78     (opaque-identity :foo)
  79     (let ((z (the list y)))
  80       (length z))))
  81 (assert (eql (test-let-var-subst2 17) 2))
  82
  83 ;;; DX propagation through LET-return.
  84 (defun-with-dx test-lvar-subst (x)
  85   (let ((y (list x (1- x))))
  86     (declare (dynamic-extent y))
  87     (second (let ((z (the list y)))
  88               (opaque-identity :foo)
  89               z))))
  90 (assert (eql (test-lvar-subst 11) 10))
  91
  92 ;;; this code is incorrect, but the compiler should not fail
  93 (defun-with-dx test-let-var-subst-incorrect (x)
  94   (let ((y (list x (1- x))))
  95     (opaque-identity :foo)
  96     (let ((z (the list y)))
  97       (declare (dynamic-extent z))
  98       (opaque-identity :bar)
  99       z)))
 100 \f
 101 ;;; alignment
 102 (defvar *x*)
 103 (defun-with-dx test-alignment-dx-list (form)
 104   (multiple-value-prog1 (eval form)
 105     (let ((l (list 1 2 3 4)))
 106       (declare (dynamic-extent l))
 107       (setq *x* (copy-list l)))))
 108 (dotimes (n 64)
 109   (let* ((res (loop for i below n collect i))
 110          (form `(values ,@res)))
 111     (assert (equal (multiple-value-list (test-alignment-dx-list form)) res))
 112     (assert (equal *x* '(1 2 3 4)))))
 113
 114 ;;; closure
 115
 116 (declaim (notinline true))
 117 (defun true (x)
 118   (declare (ignore x))
 119   t)
 120
 121 (defun-with-dx dxclosure (x)
 122   (flet ((f (y)
 123            (+ y x)))
 124     (declare (dynamic-extent #'f))
 125     (true #'f)))
 126
 127 (assert (eq t (dxclosure 13)))
 128
 129 \f
 130 (defmacro assert-no-consing (form &optional times)
 131   `(%assert-no-consing (lambda () ,form) ,times))
 132 (defun %assert-no-consing (thunk &optional times)
 133   (let ((before (get-bytes-consed))
 134         (times (or times 10000)))
 135     (declare (type (integer 1 *) times))
 136     (dotimes (i times)
 137       (funcall thunk))
 138     (assert (< (- (get-bytes-consed) before) times))))
 139
 140 #+(or x86 x86-64 alpha ppc sparc mips)
 141 (progn
 142   (assert-no-consing (dxclosure 42))
 143   (assert-no-consing (dxlength 1 2 3))
 144   (assert-no-consing (dxlength t t t t t t))
 145   (assert-no-consing (dxlength))
 146   (assert-no-consing (dxcaller 1 2 3 4 5 6 7))
 147   (assert-no-consing (test-nip-values))
 148   (assert-no-consing (test-let-var-subst1 17))
 149   (assert-no-consing (test-let-var-subst2 17))
 150   (assert-no-consing (test-lvar-subst 11)))
 151
 152 \f
 153 ;;; Bugs found by Paul F. Dietz
 154 (assert
 155  (eq
 156   (funcall
 157    (compile
 158     nil
 159     '(lambda (a b)
 160       (declare (optimize (speed 2) (space 0) (safety 0)
 161                 (debug 1) (compilation-speed 3)))
 162       (let* ((v5 (cons b b)))
 163         (declare (dynamic-extent v5))
 164         a)))
 165    'x 'y)
 166   'x))
 167
 168 \f
 169 ;;; other bugs
 170
 171 ;;; bug reported by Svein Ove Aas
 172 (defun svein-2005-ii-07 (x y)
 173   (declare (optimize (speed 3) (space 2) (safety 0) (debug 0)))
 174   (let ((args (list* y 1 2 x)))
 175     (declare (dynamic-extent args))
 176     (apply #'aref args)))
 177 (assert (eql
 178          (svein-2005-ii-07
 179           '(0)
 180           #3A(((1 1 1) (1 1 1) (1 1 1))
 181               ((1 1 1) (1 1 1) (4 1 1))
 182               ((1 1 1) (1 1 1) (1 1 1))))
 183          4))
 184
 185 ;;; bug reported by Brian Downing: stack-allocated arrays were not
 186 ;;; filled with zeroes.
 187 (defun-with-dx bdowning-2005-iv-16 ()
 188   (let ((a (make-array 11 :initial-element 0)))
 189     (declare (dynamic-extent a))
 190     (assert (every (lambda (x) (eql x 0)) a))))
 191 (bdowning-2005-iv-16)
 192
 193 \f