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Statically compute offsets for slots of <class> in Scheme

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* module/oop/goops.scm (macro-fold-left): New helper.
  (define-class-index): Define class-index-FOO for each slot FOO.
  (fold-<class>-slots): Make the slots list have the marks of the
  "visit" macro.
This commit is contained in:
Andy Wingo 2015-01-09 19:10:51 +01:00
parent affe170e5c
commit ebca094b50
1 changed files with 50 additions and 19 deletions
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69
module/oop/goops.scm
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@ -207,31 +207,62 @@
(define (compute-cpl class)
(compute-std-cpl class class-direct-supers))
(define-syntax macro-fold-left
(syntax-rules ()
((_ folder seed ()) seed)
((_ folder seed (head . tail))
(macro-fold-left folder (folder head seed) tail))))
(define-syntax macro-fold-right
(syntax-rules ()
((_ folder seed ()) seed)
((_ folder seed (head . tail))
(folder head (macro-fold-right folder seed tail)))))
(define-syntax-rule (fold-<class>-slots fold visit seed)
(fold visit seed
((layout <protected-read-only-slot>)
(flags <hidden-slot>)
(self <self-slot>)
(instance-finalizer <hidden-slot>)
(print)
(name <protected-hidden-slot>)
(reserved-0 <hidden-slot>)
(reserved-1 <hidden-slot>)
(redefined)
(direct-supers)
(direct-slots)
(direct-subclasses)
(direct-methods)
(cpl)
(slots)
(getters-n-setters)
(nfields))))
(define-syntax fold-<class>-slots
(lambda (x)
(define slots
'((layout <protected-read-only-slot>)
(flags <hidden-slot>)
(self <self-slot>)
(instance-finalizer <hidden-slot>)
(print)
(name <protected-hidden-slot>)
(reserved-0 <hidden-slot>)
(reserved-1 <hidden-slot>)
(redefined)
(direct-supers)
(direct-slots)
(direct-subclasses)
(direct-methods)
(cpl)
(slots)
(getters-n-setters)
(nfields)))
(syntax-case x ()
((_ fold visit seed)
;; The datum->syntax makes it as if the identifiers in `slots'
;; were present in the initial form, which allows them to be used
;; as (components of) introduced identifiers.
#`(fold visit seed #,(datum->syntax #'visit slots))))))
;; Define class-index-layout to 0, class-index-flags to 1, and so on.
(let-syntax ((define-class-index
(lambda (x)
(define (id-append ctx a b)
(datum->syntax ctx (symbol-append (syntax->datum a)
(syntax->datum b))))
(define (tail-length tail)
(syntax-case tail ()
((begin) 0)
((visit head tail) (1+ (tail-length #'tail)))))
(syntax-case x ()
((_ (name . _) tail)
#`(begin
(define #,(id-append #'name #'class-index- #'name)
#,(tail-length #'tail))
tail))))))
(fold-<class>-slots macro-fold-left define-class-index (begin)))
(define (build-slots-list dslots cpl)
(define (check-cpl slots class-slots)