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Rewrite mutated vars to prevent mutations for loops

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Justin Ethier 2019-09-16 22:25:12 -04:00
parent 82dd4cb5c3
commit e45837a19f
1 changed files with 28 additions and 13 deletions
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41
scheme/cyclone/cps-optimizations.sld
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@ -2501,9 +2501,10 @@
(define mutated-loop-vars '())
(define (mark-mutated-loop-var sym)
;(write `(DEBUG mark mutated loop var ,sym)) (newline)
(set! mutated-loop-vars (cons sym mutated-loop-vars)))
(define (mutated-loop-var? sym)
(member sym mutated-loop-var))
(member sym mutated-loop-vars))
; analyze-mutable-variables : exp -> void
(define (analyze-mutable-variables exp)
@ -2531,12 +2532,16 @@
(map analyze-mutable-variables exp)
;; Check if the application is a sentinel indicating the
;; var may be used for a recursive loop.
;(when (and (= 2 (length exp))
; (ast:lambda? (car exp))
; (not (cadr exp)))
; ;; Candidate, see if the var is set to a lambda
; (with-var
;)
(when (and (= 2 (length exp))
(ast:lambda? (car exp))
(not (cadr exp)))
;; Candidate, see if the var is set to a lambda
(with-var (car (ast:lambda-formals->list (car exp))) (lambda (var)
(if (and (adbv:mutated-by-set? var)
(ast:lambda? (adbv:assigned-value var)))
(mark-mutated-loop-var (car (ast:lambda-formals->list (car exp)))))
))
)
(void))
(else
(error "unknown expression type: " exp))))
@ -2557,7 +2562,12 @@
(list (car formals))
(wrap-mutable-formals id (cdr formals) body-exp has-cont)
has-cont)
`(cell ,(car formals))))
`(cell ;,(car formals)
,(if (mutated-loop-var? (car formals))
(with-var (car formals) (lambda (var)
(adbv:assigned-value var)))
(car formals))
)))
(wrap-mutable-formals id (cdr formals) body-exp has-cont))))
(cond
@ -2581,11 +2591,16 @@
((prim? exp) exp)
((quote? exp) exp)
((lambda? exp) (error `(Unexpected lambda in wrap-mutables ,exp)))
((set!? exp) `(,(if (member (set!->var exp) globals)
'set-global!
'set-cell!)
,(set!->var exp)
,(wrap-mutables (set!->exp exp) globals)))
((set!? exp)
(cond
((mutated-loop-var? (set!->var exp))
#f) ;; essentially no-op in generated code
(else
`(,(if (member (set!->var exp) globals)
'set-global!
'set-cell!)
,(set!->var exp)
,(wrap-mutables (set!->exp exp) globals)))))
((if? exp) `(if ,(wrap-mutables (if->condition exp) globals)
,(wrap-mutables (if->then exp) globals)
,(wrap-mutables (if->else exp) globals)))