guile-for-guile-emacs/test-suite/standalone/test-out-of-memory

#!/bin/sh
guild compile "$0"
exec guile -q -s "$0" "$@"
!#

(unless (defined? 'setrlimit)
  ;; Without an rlimit, this test can take down your system, as it
  ;; consumes all of your memory.  That doesn't seem like something we
  ;; should run as part of an automated test suite.
  (exit 0))

(catch #t
  ;; Silence GC warnings.
  (lambda ()
    (current-warning-port (open-output-file "/dev/null")))
  (lambda (k . args)
    (print-exception (current-error-port) #f k args)
    (write "Skipping test.\n" (current-error-port))
    (exit 0)))

;; 50 MB.
(define *limit* (* 50 1024 1024))

(call-with-values (lambda () (getrlimit 'as))
  (lambda (soft hard)
    (unless (and soft (< soft *limit*))
      (setrlimit 'as (if hard (min *limit* hard) *limit*) hard))))

(define (test thunk)
  (catch 'out-of-memory
    (lambda ()
      (thunk)
      (error "should not be reached"))
    (lambda _
      #t)))

(use-modules (rnrs bytevectors))

(test (lambda ()
        ;; Unhappily, on 32-bit systems, vectors are limited to 16M
        ;; elements.  Boo.  Anyway, a vector with 16M elements takes 64
        ;; MB, which doesn't fit into 50 MB.
        (make-vector (1- (ash 1 24)))))
(test (lambda ()
        ;; Likewise for a bytevector.  This is different from the above,
        ;; as the elements of a bytevector are not traced by GC.
        (make-bytevector #e1e9)))
(test (lambda ()
        ;; This one is the kicker -- we allocate pairs until the heap
        ;; can't expand.  This is the hardest test to deal with because
        ;; the error-handling machinery has no memory in which to work.
        (iota #e1e8)))
(test (lambda ()
        ;; The same, but also causing allocating during the unwind
        ;; (ouch!)
        (dynamic-wind
          (lambda () #t)
          (lambda () (iota #e1e8))
          (lambda () (iota #e1e8)))))

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