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Added lambda side effect analysis

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Justin Ethier 2017-05-03 21:54:51 +00:00
parent 6881285e0c
commit 1a973cafd8
1 changed files with 30 additions and 3 deletions
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33
scheme/cyclone/cps-optimizations.sld
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@ -298,7 +298,7 @@
;; Mark each lambda that has side effects.
;; For nested lambdas, if a child has side effects also mark the parent
#;(define (analyze-lambda-side-effects exp lid)
(define (analyze-lambda-side-effects exp lid)
(cond
((ast:lambda? exp)
(let* ((id (ast:lambda-id exp))
@ -307,23 +307,48 @@
(for-each
(lambda (expr)
(analyze-lambda-side-effects expr id))
(ast:lambda-body exp))))
(ast:lambda-body exp))
;; If id has side effects, mark parent lid, too
(if (and (> lid -1)
(adbf:side-effects fnc))
(with-fnc! lid (lambda (f)
(adbf:set-side-effects! f #t))))))
((const? exp) #f)
((quote? exp) #f)
((ref? exp) #f)
((define? exp)
(analyze-lambda-side-effects (define->exp exp) lid))
((set!? exp)
(with-fnc! lid (lambda (fnc)
(adbf:set-side-effects! fnc #t)))
(analyze-lambda-side-effects (set!->exp exp) lid))
((if? exp)
(analyze-lambda-side-effects (if->condition exp) lid)
(analyze-lambda-side-effects (if->then exp) lid)
(analyze-lambda-side-effects (if->else exp) lid))
((app? exp)
(let ((pure-ref #t))
;; Check if ref is pure. Note this may give wrong results
;; if ref's lambda has not been scanned yet. One solution is
;; to make 2 top-level passes of analyze-lambda-side-effects.
(if (ref? (car exp))
(with-var (car exp) (lambda (var)
(if (adbv:defines-lambda-id var)
(with-fnc! (adbv:defines-lambda-id var) (lambda (fnc)
(if (adbf:side-effects fnc)
(set! pure-ref #f))))))))
;; This lambda has side effects if it calls a mutating prim or
;; a function not explicitly marked as having no side effects.
(if (or (prim:mutates? (car exp))
(and (ref? (car exp))
(not pure-ref)))
(with-fnc! lid (lambda (fnc)
(adbf:set-side-effects! fnc #t))))
(for-each
(lambda (e)
(analyze-lambda-side-effects e lid))
exp))
exp)))
(else
#f)))
@ -1085,6 +1110,8 @@
(define (analyze-cps exp)
(analyze-find-lambdas exp -1)
(analyze-lambda-side-effects exp -1)
(analyze-lambda-side-effects exp -1) ;; 2nd pass guarantees lambda purity
(analyze exp -1) ;; Top-level is lambda ID -1
(analyze2 exp) ;; Second pass
(analyze:find-inlinable-vars exp '()) ;; Identify variables safe to inline