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Fix up subst-gen to treat vars and idxs separately.

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Stevie Strickland 2010-06-04 14:13:03 -04:00 committed by Sam Tobin-Hochstadt
parent d886331807
commit ec09139e0a
1 changed files with 24 additions and 14 deletions
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38
collects/typed-scheme/infer/infer-unit.rkt
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@ -465,20 +465,21 @@
(d/c (subst-gen C R)
(cset? Type? . -> . (or/c #f list?))
;; fixme - should handle these separately
(define must-vars (append (fv R) (fi R)))
(define (constraint->type v #:variable [variable #f])
(define var-hash (free-vars* R))
(define idx-hash (free-idxs* R))
;; v : Symbol - variable for which to check variance
;; h : (Hash Symbol Variance) - hash to check variance in (either var or idx hash)
;; variable: Symbol - variable to use instead, if v was a temp var for idx extension
(define (constraint->type v h #:variable [variable #f])
(match v
[(struct c (S X T))
;; fixme - handle free indexes, remove Dotted
(let ([var (hash-ref (free-vars* R) (or variable X) (λ () (hash-ref (free-idxs* R) (or variable X) Constant)))])
(let ([var (hash-ref h (or variable X) Constant)])
;(printf "variance was: ~a~nR was ~a~nX was ~a~nS T ~a ~a~n" var R (or variable X) S T)
(evcase var
[Constant S]
[Covariant S]
[Contravariant T]
[Invariant S]
[Dotted T]))]))
[Invariant S]))]))
(match (car (cset-maps C))
[(cons cmap (dmap dm))
(let ([subst (append
@ -487,18 +488,27 @@
[(dcon fixed rest)
(list k
(for/list ([f fixed])
(constraint->type f #:variable k))
(and rest (constraint->type rest)))]
(constraint->type f idx-hash #:variable k))
(and rest (constraint->type rest idx-hash)))]
[(dcon-exact fixed rest)
(list k
(for/list ([f fixed])
(constraint->type f #:variable k))
(constraint->type rest))]))
(constraint->type f idx-hash #:variable k))
(constraint->type rest idx-hash))]))
(for/list ([(k v) (in-hash cmap)])
(list k (constraint->type v))))])
(list k (constraint->type v var-hash))))])
;; verify that we got all the important variables
(and (for/and ([v must-vars])
(assq v subst))
(and (for/and ([v (fv R)])
(let ([entry (assq v subst)])
;; Make sure we got a subst entry for a type var
;; (i.e. just a type to substitute)
(and entry (= (length entry) 2))))
(for/and ([v (fi R)])
(let ([entry (assq v subst)])
;; Make sure we got a subst entry for an index var
;; (i.e. a list of types for the fixed portion
;; and a type for the starred portion)
(and entry (= (length entry) 3))))
subst))]))
;; V : a set of variables not to mention in the constraints