tests/hash.pure.lisp

   1 ;;;; This software is part of the SBCL system. See the README file for
   2 ;;;; more information.
   3 ;;;;
   4 ;;;; While most of SBCL is derived from the CMU CL system, the test
   5 ;;;; files (like this one) were written from scratch after the fork
   6 ;;;; from CMU CL.
   7 ;;;;
   8 ;;;; This software is in the public domain and is provided with
   9 ;;;; absolutely no warranty. See the COPYING and CREDITS files for
  10 ;;;; more information.
  11
  12 (in-package :cl-user)
  13
  14 ;;; +MAGIC-HASH-VECTOR-VALUE+ is used to mark empty entries in the slot
  15 ;;; HASH-VECTOR of hash tables. It must be a value outside of the range
  16 ;;; of SXHASH. The range of SXHASH is the non-negative fixnums.
  17 (assert (not (typep sb-impl::+magic-hash-vector-value+
  18                     '(and fixnum unsigned-byte))))
  19
  20 ;;; The return value of SXHASH on non-string/bitvector arrays should not
  21 ;;; change when the contents of the array change.
  22 (let* ((a (make-array '(1) :initial-element 1))
  23        (sxhash (sxhash a))
  24        (hash (make-hash-table :test 'equal)))
  25   (setf (gethash a hash) t)
  26   (setf (aref a 0) 0)
  27   (assert (= sxhash (sxhash a)))
  28   ;; Need to make another access to the hash to disable the last-seen-element
  29   ;; cache.
  30   (setf (gethash 'y hash) t)
  31   (assert (gethash a hash)))