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Fix comments and make field-info-* functions only deal with field-infos.

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This commit is contained in:
Stevie Strickland 2010-11-17 11:43:35 -05:00
parent 96db670d8c
commit 500c2f6084
1 changed files with 28 additions and 30 deletions
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40
collects/racket/private/class-internal.rkt
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@ -200,40 +200,35 @@
;; field info creation/access
;;--------------------------------------------------------------------
;; A field-info is a (vector apos iref iset eref eset)
;; A field-info is a (vector iref iset eref eset)
;; where
;; apos is the absolute position of the field in the object struct
;; used for calls to unsafe-struct-ref/-set!
;; iref, iset, eref, and eset are projections to be applied
;; on internal and external reference and setting.
;; on internal and external access and mutation.
;; make-field-info creates a new field-info for a field.
;; The caller gives the absolute position, and this function fills
;; The caller gives the class and relative position (in the
;; new object struct layer), and this function fills
;; in the projections.
(define (make-field-info cls rpos)
(let ([field-ref (make-struct-field-accessor (class-field-ref cls) rpos)]
[field-set! (make-struct-field-mutator (class-field-set! cls) rpos)])
(vector field-ref field-set! field-ref field-set!)))
(define (field-info-extend-internal! field-ht f ppos pneg)
(let* ([fi (hash-ref field-ht f)]
[old-ref (unsafe-vector-ref fi 0)]
(define (field-info-extend-internal fi ppos pneg)
(let* ([old-ref (unsafe-vector-ref fi 0)]
[old-set! (unsafe-vector-ref fi 1)])
(hash-set! field-ht f
(vector (λ (o) (ppos (old-ref o)))
(λ (o v) (old-set! o (pneg v)))
(unsafe-vector-ref fi 2)
(unsafe-vector-ref fi 3)))))
(unsafe-vector-ref fi 3))))
(define (field-info-extend-external! field-ht f ppos pneg)
(let* ([fi (hash-ref field-ht f)]
[old-ref (unsafe-vector-ref fi 2)]
(define (field-info-extend-external fi ppos pneg)
(let* ([old-ref (unsafe-vector-ref fi 2)]
[old-set! (unsafe-vector-ref fi 3)])
(hash-set! field-ht f
(vector (unsafe-vector-ref fi 0)
(unsafe-vector-ref fi 1)
(λ (o) (ppos (old-ref o)))
(λ (o v) (old-set! o (pneg v)))))))
(λ (o v) (old-set! o (pneg v))))))
(define (field-info-internal-ref fi) (unsafe-vector-ref fi 0))
(define (field-info-internal-set! fi) (unsafe-vector-ref fi 1))
@ -2726,15 +2721,17 @@
(for ([f (in-list (class/c-fields ctc))]
[c (in-list (class/c-field-contracts ctc))])
(when c
(let* ([p-pos ((contract-projection c) blame)]
(let ([fi (hash-ref field-ht f)]
[p-pos ((contract-projection c) blame)]
[p-neg ((contract-projection c) bswap)])
(field-info-extend-external! field-ht f p-pos p-neg))))
(hash-set! field-ht f (field-info-extend-external fi p-pos p-neg)))))
(for ([f (in-list (class/c-inherit-fields ctc))]
[c (in-list (class/c-inherit-field-contracts ctc))])
(when c
(let* ([p-pos ((contract-projection c) blame)]
(let ([fi (hash-ref field-ht f)]
[p-pos ((contract-projection c) blame)]
[p-neg ((contract-projection c) bswap)])
(field-info-extend-internal! field-ht f p-pos p-neg)))))
(hash-set! field-ht f (field-info-extend-internal fi p-pos p-neg))))))
;; Now the trickiest of them all, internal dynamic dispatch.
;; First we update any dynamic indexes, as applicable.
@ -4425,9 +4422,10 @@
(for ([f (in-list fields)]
[c (in-list field-contracts)])
(when c
(let* ([p-pos ((contract-projection c) blame)]
(let ([fi (hash-ref field-ht f)]
[p-pos ((contract-projection c) blame)]
[p-neg ((contract-projection c) bset)])
(field-info-extend-external! field-ht f p-pos p-neg))))))
(hash-set! field-ht f (field-info-extend-external fi p-pos p-neg)))))))
c))