detect cycles when compiling internal events
This commit is contained in:
parent
e6524174e1
commit
27abf8ab1e
|
@ -166,15 +166,13 @@
|
|||
(define (compile/internal-events rg role)
|
||||
(match-define (role-graph st0 orig-st#) rg)
|
||||
;; doing funny business with state (set) here
|
||||
(define orig-st#* (hash-set orig-st# (set) (state (set) (hash))))
|
||||
(define assertion# (hash-set (all-states-assertions/internal (in-hash-keys orig-st#) role)
|
||||
(set)
|
||||
(set)))
|
||||
(define orig-st#+ (hash-set orig-st# (set) (state (set) (hash))))
|
||||
(define assertion# (all-states-assertions/internal (in-hash-keys orig-st#+) role))
|
||||
;; a WorkItem is a
|
||||
;; (work-item StateName StateName D (Listof D) (Listof TransitionEffect))
|
||||
;; such as (work-item from prev to by with effs), where
|
||||
;; (work-item StateName (Listof StateName) D (Listof D) (Listof TransitionEffect))
|
||||
;; such as (work-item from path/r to by with effs), where
|
||||
;; - from is the origin state for this chain of events
|
||||
;; - prev is the prior state in the sequence
|
||||
;; - path/r is the list of states in the path to this point, in reverse
|
||||
;; - to is the current state that has been reached
|
||||
;; - by is the external event that kicked off this sequence
|
||||
;; - with is a list of pending events to be processed
|
||||
|
@ -182,65 +180,78 @@
|
|||
;; NOTE: the initial work item is a hack, setting from and prev to (set) and
|
||||
;; by to DataflowEvt. The first case in the outer match removes (set) from the
|
||||
;; states to compensate for this.
|
||||
(struct work-item (from prev to by with effs) #:transparent)
|
||||
(define (walk work visited st#)
|
||||
(match work
|
||||
['()
|
||||
(define states
|
||||
(for/hash ([(sn txns) (in-hash st#)]
|
||||
#:unless (set-empty? sn))
|
||||
(values sn (state sn txns))))
|
||||
;; TODO - st0 might have changed
|
||||
(role-graph st0 states)]
|
||||
[(cons (work-item from prev to by with effs) more-work)
|
||||
(define txn# (state-transitions (hash-ref orig-st# to)))
|
||||
(define visited+ (set-add visited to))
|
||||
(define st#+ (if (hash-has-key? st# to) st# (hash-set st# to (hash))))
|
||||
(define new-paths-work
|
||||
(for*/list (#:unless (set-member? visited to)
|
||||
[(D txns) txn#]
|
||||
#:when (external-evt? D)
|
||||
#:unless (equal? D DataflowEvt)
|
||||
[t (in-set txns)])
|
||||
(match-define (transition es dst) t)
|
||||
(work-item to to dst D (effs->internal-events es) es)))
|
||||
(define new-events (route-internal (hash-ref assertion# prev)
|
||||
(hash-ref assertion# to)))
|
||||
(cond
|
||||
[(and (empty? with)
|
||||
(set-empty? new-events))
|
||||
(define new-st# (update-path st#+ from to by effs))
|
||||
(walk (append more-work new-paths-work) visited+ new-st#)]
|
||||
[else
|
||||
;; TODO - this is saying something about how the implementation schedules handlers;
|
||||
;; I think it should be something like exploring (append with (permutations new-events))
|
||||
(define new-events* (set->list new-events))
|
||||
(define pending (append with new-events*))
|
||||
(define pending/first-relevant
|
||||
(dropf pending
|
||||
(lambda (evt)
|
||||
(not
|
||||
(for/or ([D (in-hash-keys txn#)])
|
||||
;; TODO - think I want non-empty intersection instead of subtyping
|
||||
(or (D<:? evt D)
|
||||
(D<:? D evt)))))))
|
||||
(match pending/first-relevant
|
||||
['()
|
||||
(define new-st# (update-path st#+ from to by effs))
|
||||
(walk (append more-work new-paths-work) visited+ new-st#)]
|
||||
[(cons evt more-pending)
|
||||
(define more-labor
|
||||
(for*/list ([(D ts) (in-hash txn#)]
|
||||
#:when (or (D<:? evt D)
|
||||
(D<:? D evt))
|
||||
[t (in-set ts)])
|
||||
(match-define (transition more-effs dest) t)
|
||||
(define internal-effs (effs->internal-events more-effs))
|
||||
(work-item from to dest (append more-pending internal-effs) (append effs more-effs))))
|
||||
(walk (append more-work more-labor new-paths-work) visited+ st#+)])])]))
|
||||
(walk (list (work-item (set) (set) st0 StartEvt '() '()))
|
||||
(set)
|
||||
(hash)))
|
||||
(struct work-item (from path/r to by with effs) #:transparent)
|
||||
(let/ec fail
|
||||
(define (walk work visited st#)
|
||||
(match work
|
||||
['()
|
||||
(define states
|
||||
(for/hash ([(sn txns) (in-hash st#)]
|
||||
#:unless (set-empty? sn))
|
||||
(values sn (state sn txns))))
|
||||
;; TODO - st0 might have changed
|
||||
(role-graph st0 states)]
|
||||
[(cons (work-item from path/r to by with effs) more-work)
|
||||
(define prev (first path/r))
|
||||
(define txn# (state-transitions (hash-ref orig-st#+ to)))
|
||||
(define visited+ (set-add visited to))
|
||||
(define st#+ (if (hash-has-key? st# to) st# (hash-set st# to (hash))))
|
||||
(define new-paths-work
|
||||
(for*/list (#:unless (set-member? visited to)
|
||||
[(D txns) (in-hash txn#)]
|
||||
#:when (external-evt? D)
|
||||
#:unless (equal? D DataflowEvt)
|
||||
[t (in-set txns)])
|
||||
(match-define (transition es dst) t)
|
||||
(work-item to (list to) dst D (effs->internal-events es) es)))
|
||||
(define new-events (route-internal (hash-ref assertion# prev)
|
||||
(hash-ref assertion# to)))
|
||||
(cond
|
||||
[(and (empty? with)
|
||||
(set-empty? new-events)
|
||||
(not (hash-has-key? txn# DataflowEvt)))
|
||||
(define new-st# (update-path st#+ from to by effs))
|
||||
(walk (append more-work new-paths-work) visited+ new-st#)]
|
||||
[else
|
||||
;; TODO - this is saying something about how the implementation schedules handlers;
|
||||
;; I think it should be something like exploring (append with (permutations new-events))
|
||||
(define new-events* (set->list new-events))
|
||||
(define new-events/df (if (hash-has-key? txn# DataflowEvt) (cons DataflowEvt new-events*) new-events*))
|
||||
(define pending (append with new-events/df))
|
||||
(define pending/first-relevant
|
||||
(dropf pending
|
||||
(lambda (evt)
|
||||
(not
|
||||
(for/or ([D (in-hash-keys txn#)])
|
||||
;; TODO - think I want non-empty intersection instead of subtyping
|
||||
(D<:? evt D))))))
|
||||
(match pending/first-relevant
|
||||
['()
|
||||
(define new-st# (update-path st#+ from to by effs))
|
||||
(walk (append more-work new-paths-work) visited+ new-st#)]
|
||||
[(cons evt more-pending)
|
||||
(define path/r+ (cons to path/r))
|
||||
(define more-labor
|
||||
(for*/list ([(D ts) (in-hash txn#)]
|
||||
#:when (D<:? evt D)
|
||||
[t (in-set ts)])
|
||||
(match-define (transition more-effs dest) t)
|
||||
(when (member dest path/r+)
|
||||
(fail (list (reverse (cons dest path/r+))
|
||||
by
|
||||
evt
|
||||
D)))
|
||||
(define internal-effs (effs->internal-events more-effs))
|
||||
(work-item from
|
||||
path/r+
|
||||
dest
|
||||
by
|
||||
(append more-pending internal-effs)
|
||||
(append effs more-effs))))
|
||||
(walk (append more-work more-labor new-paths-work) visited+ st#+)])])]))
|
||||
(walk (list (work-item (set) (list (set)) st0 StartEvt '() '()))
|
||||
(set)
|
||||
(hash))))
|
||||
|
||||
(module+ test
|
||||
(test-case
|
||||
|
|
Loading…
Reference in New Issue