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;;;; weaks.test --- tests guile's weaks -*- scheme -*-
;;;; Copyright (C) 1999, 2001, 2003, 2006, 2009, 2010, 2011, 2012, 2014
;;;; Free Software Foundation, Inc.
;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;;
;;;; This library is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;;; {Description}
;;; This is a semi test suite for weaks; I say semi, because weaks
;;; are pretty non-deterministic given the amount of information we
;;; can infer from scheme.
;;;
;;; In particular, we can't always reliably test the more important
;;; aspects of weaks (i.e., that an object is removed when it's dead)
;;; because we have no way of knowing for certain that the object is
;;; really dead. It tests it anyway, but the failures of any `death'
;;; tests really shouldn't be surprising.
;;;
;;; Interpret failures in the dying functions here as a hint that you
;;; should look at any changes you've made involving weaks
;;; (everything else should always pass), but there are a host of
;;; other reasons why they might not work as tested here, so if you
;;; haven't done anything to weaks, don't sweat it :)
(define-module (test-weaks)
#:use-module (test-suite lib)
#:use-module (ice-9 weak-vector)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26))
;;; Creation functions
(with-test-prefix
"weak-creation"
(with-test-prefix "make-weak-vector"
(pass-if "normal"
(make-weak-vector 10 #f)
#t)
(pass-if-exception "bad size"
exception:wrong-type-arg
(make-weak-vector 'foo)))
(with-test-prefix "list->weak-vector"
(pass-if "create"
(let* ((lst '(a b c d e f g))
(wv (list->weak-vector lst)))
(and (eq? (weak-vector-ref wv 0) 'a)
(eq? (weak-vector-ref wv 1) 'b)
(eq? (weak-vector-ref wv 2) 'c)
(eq? (weak-vector-ref wv 3) 'd)
(eq? (weak-vector-ref wv 4) 'e)
(eq? (weak-vector-ref wv 5) 'f)
(eq? (weak-vector-ref wv 6) 'g))))
(pass-if-exception "bad-args"
exception:wrong-type-arg
(list->weak-vector 32)))
(with-test-prefix "make-weak-key-hash-table"
(pass-if "create"
(make-weak-key-hash-table 17)
#t)
(pass-if-exception "bad-args"
exception:wrong-type-arg
(make-weak-key-hash-table '(bad arg))))
(with-test-prefix "make-weak-value-hash-table"
(pass-if "create"
(make-weak-value-hash-table 17)
#t)
(pass-if-exception "bad-args"
exception:wrong-type-arg
(make-weak-value-hash-table '(bad arg))))
(with-test-prefix "make-doubly-weak-hash-table"
(pass-if "create"
(make-doubly-weak-hash-table 17)
#t)
(pass-if-exception "bad-args"
exception:wrong-type-arg
(make-doubly-weak-hash-table '(bad arg)))))
;; This should remove most of the non-dying problems associated with
;; trying this inside a closure
(define global-weak (make-weak-vector 10 #f))
(begin
(weak-vector-set! global-weak 0 (string-copy "string"))
(weak-vector-set! global-weak 1 (string-copy "beans"))
(weak-vector-set! global-weak 2 (string-copy "to"))
(weak-vector-set! global-weak 3 (string-copy "utah"))
(weak-vector-set! global-weak 4 (string-copy "yum yum"))
(gc))
;;; Normal weak vectors
(let ((x (make-weak-vector 10 #f))
(bar "bar"))
(with-test-prefix
"weak-vector"
(pass-if "lives"
(begin
(weak-vector-set! x 0 bar)
(gc)
(and (weak-vector-ref x 0) (eq? bar (weak-vector-ref x 0)))))
(pass-if "dies"
(begin
(gc)
(or (and (not (weak-vector-ref global-weak 0))
(not (weak-vector-ref global-weak 1))
(not (weak-vector-ref global-weak 2))
(not (weak-vector-ref global-weak 3))
(not (weak-vector-ref global-weak 4)))
(throw 'unresolved))))))
;;;
;;; Weak hash tables & weak alist vectors.
;;;
(define (valid? value initial-value)
;; Return true if VALUE is "valid", i.e., if it's either #f or
;; INITIAL-VALUE. The idea is to make sure `hash-ref' doesn't return
;; garbage.
(or (not value)
(equal? value initial-value)))
(let ((x (make-weak-key-hash-table 17))
(y (make-weak-value-hash-table 17))
(z (make-doubly-weak-hash-table 17))
(test-key "foo")
(test-value "bar"))
(with-test-prefix
"weak-hash"
(pass-if "lives"
(begin
(hash-set! x test-key test-value)
(hash-set! y test-key test-value)
(hash-set! z test-key test-value)
(gc)
(gc)
(and (hash-ref x test-key)
(hash-ref y test-key)
(hash-ref z test-key)
#t)))
;; In the tests below we use `string-copy' to avoid the risk of
;; unintended retention of a string that we want to be GC'd.
(pass-if "weak-key dies"
(begin
(hash-set! x (string-copy "this") "is")
(hash-set! x (string-copy "a") "test")
(hash-set! x (string-copy "of") "the")
(hash-set! x (string-copy "emergency") "weak")
(hash-set! x (string-copy "key") "hash system")
(gc)
(let ((values (map (cut hash-ref x <>)
'("this" "a" "of" "emergency" "key"))))
(and (every valid? values
'("is" "test" "the" "weak" "hash system"))
(any not values)
(hash-ref x test-key)
#t))))
(pass-if "weak-value dies"
(begin
(hash-set! y "this" (string-copy "is"))
(hash-set! y "a" (string-copy "test"))
(hash-set! y "of" (string-copy "the"))
(hash-set! y "emergency" (string-copy "weak"))
(hash-set! y "value" (string-copy "hash system"))
(gc)
(let ((values (map (cut hash-ref y <>)
'("this" "a" "of" "emergency" "key"))))
(and (every valid? values
'("is" "test" "the" "weak" "hash system"))
(any not values)
(hash-ref y test-key)
#t))))
(pass-if "doubly-weak dies"
(begin
(hash-set! z (string-copy "this") (string-copy "is"))
(hash-set! z "a" (string-copy "test"))
(hash-set! z (string-copy "of") "the")
(hash-set! z "emergency" (string-copy "weak"))
(hash-set! z (string-copy "all") (string-copy "hash system"))
(gc)
(let ((values (map (cut hash-ref z <>)
'("this" "a" "of" "emergency" "key"))))
(and (every valid? values
'("is" "test" "the" "weak" "hash system"))
(any not values)
(hash-ref z test-key)
#t))))
(pass-if "hash-set!, weak val, im -> im"
(let ((t (make-weak-value-hash-table)))
(hash-set! t "foo" 1)
(hash-set! t "foo" 2)
(equal? (hash-ref t "foo") 2)))
(pass-if "hash-set!, weak val, im -> nim"
(let ((t (make-weak-value-hash-table)))
(hash-set! t "foo" 1)
(hash-set! t "foo" "baz")
(equal? (hash-ref t "foo") "baz")))
(pass-if "hash-set!, weak val, nim -> nim"
(let ((t (make-weak-value-hash-table)))
(hash-set! t "foo" "bar")
(hash-set! t "foo" "baz")
(equal? (hash-ref t "foo") "baz")))
(pass-if "hash-set!, weak val, nim -> im"
(let ((t (make-weak-value-hash-table)))
(hash-set! t "foo" "bar")
(hash-set! t "foo" 1)
(equal? (hash-ref t "foo") 1)))
(pass-if "hash-set!, weak key, returns value"
(let ((t (make-weak-value-hash-table))
(val (string #\f #\o #\o)))
(eq? (hashq-set! t "bar" val)
(hashv-set! t "bar" val)
(hash-set! t "bar" val)
val)))
(pass-if "assoc can do anything"
;; Until 1.9.12, as hash table's custom ASSOC procedure was
;; called with the GC lock alloc held, which imposed severe
;; restrictions on what it could do (bug #29616). This test
;; makes sure this is no longer the case.
(let ((h (make-doubly-weak-hash-table 2))
(c 123)
(k "GNU"))
(define (assoc-ci key bucket)
(make-list 123) ;; this should be possible
(gc) ;; this too
(find (lambda (p)
(string-ci=? key (car p)))
bucket))
(hashx-set! string-hash-ci assoc-ci h
(string-copy "hello") (string-copy "world"))
(hashx-set! string-hash-ci assoc-ci h
k "Guile")
(and (every (cut valid? <> "Guile")
(unfold (cut >= <> c)
(lambda (_)
(hashx-ref string-hash-ci assoc-ci
h "gnu"))
1+
0))
(every (cut valid? <> "world")
(unfold (cut >= <> c)
(lambda (_)
(hashx-ref string-hash-ci assoc-ci
h "HELLO"))
1+
0))
#t)))))
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