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schemify: improve handling for mutated, known-initialized variables

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Avoid unnecessary checks for an "undefined" state.
This commit is contained in:
Matthew Flatt 2019-09-18 19:03:18 -06:00
parent f0a0ffc50d
commit d02fbebba8
2 changed files with 14 additions and 5 deletions
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1
racket/src/schemify/mutated-state.rkt
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@ -62,6 +62,7 @@
(define (too-early-mutated-state? v)
(or (eq? v 'too-early)
(eq? v 'set!ed-too-early)
(eq? v 'undefined)
(too-early? v)))
(define (too-early-mutated-state-name v default-sym)

18
racket/src/schemify/schemify.rkt
View File

@ -127,8 +127,8 @@
(if serializable?
(convert-for-serialize bodys #f datum-intern?)
(values bodys null)))
;; Collect source names for define identifiers, to the degree that the source
;; name differs from the
;; Collect source names for defined identifiers, to the degree that the
;; original source name differs from the current name
(define src-syms (get-definition-source-syms bodys))
;; Schemify the body, collecting information about defined names:
(define-values (new-body defn-info mutated)
@ -579,11 +579,16 @@
(define int-id (unwrap id))
(define ex (hash-ref exports int-id #f))
(define new-rhs (schemify rhs))
(define state (hash-ref mutated int-id #f))
(cond
[ex
`(,(if allow-set!-undefined? 'variable-set! 'variable-set!/check-undefined) ,(export-id ex) ,new-rhs)]
(define set-id
(if (or allow-set!-undefined?
(not (too-early-mutated-state? state)))
'variable-set!
'variable-set!/check-undefined))
`(,set-id ,(export-id ex) ,new-rhs)]
[else
(define state (hash-ref mutated int-id #f))
(cond
[(and (too-early-mutated-state? state)
(not for-cify?))
@ -785,7 +790,10 @@
(cond
[(and (via-variable-mutated-state? state)
(hash-ref exports u-v #f))
=> (lambda (ex) `(variable-ref ,(export-id ex)))]
=> (lambda (ex)
(if (too-early-mutated-state? state)
`(variable-ref ,(export-id ex))
`(variable-ref/no-check ,(export-id ex))))]
[(hash-ref imports u-v #f)
=> (lambda (im)
(define k (import-lookup im))