119 lines
4.8 KiB
Scheme
119 lines
4.8 KiB
Scheme
#lang scheme
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(require syntax/free-vars
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(for-template
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scheme/base
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scheme/serialize))
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(define (define-closure! label fvars stx)
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; Boxes
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(define make-CLOSURE-box
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(syntax-local-lift-expression
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(quasisyntax/loc stx
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(box (lambda (env) (error 'make-CLOSURE "Closure<~e> not initialized" '#,label))))))
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(define CLOSURE-set-env!-box
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(syntax-local-lift-expression
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(quasisyntax/loc stx
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(box (lambda (clsr new-env) (error 'CLOSURE-set-env! "Closure<~e> not initialized" '#,label))))))
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(define CLOSURE-env-box
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(syntax-local-lift-expression
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(quasisyntax/loc stx
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(box (lambda (clsr) (error 'CLOSURE-env "Closure<~e> not initialized" '#,label))))))
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; Define the deserializer (req closure struct values under lambdas)
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(define CLOSURE:deserialize-info-id
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(syntax-local-lift-expression
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(quasisyntax/loc stx
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(make-deserialize-info
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;; make-proc: value ... -> CLOSURE
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(lambda args
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(apply (#%plain-lambda #,fvars
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((unbox #,make-CLOSURE-box) (#%plain-lambda () (values #,@fvars))))
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args))
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;; cycle-make-proc: -> (values CLOSURE (CLOSURE -> void))
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(lambda ()
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(let ([new-closure
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((unbox #,make-CLOSURE-box)
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(#%plain-lambda () (error 'deserialize "closure not initialized")))])
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(values
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new-closure
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(#%plain-lambda (clsr)
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((unbox #,CLOSURE-set-env!-box) new-closure ((unbox #,CLOSURE-env-box) clsr))))))))))
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; Define the serializer (req closure struct values + deserializer identifier)
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(define CLOSURE:serialize-info-id
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(syntax-local-lift-expression
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(quasisyntax/loc stx
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(make-serialize-info
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;; to-vector: CLOSURE -> vector
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(#%plain-lambda (clsr)
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(#%plain-app call-with-values
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(#%plain-lambda () (((unbox #,CLOSURE-env-box) clsr)))
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vector))
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;; The serializer id: --------------------
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(quote-syntax #,CLOSURE:deserialize-info-id)
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;; can-cycle?
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#t
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;; Directory for last-ditch resolution --------------------
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(or (current-load-relative-directory) (current-directory))))))
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; Define the closure struct (req serialize info value)
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(define-values
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(make-CLOSURE-id CLOSURE?-id CLOSURE-env-id CLOSURE-set-env!-id)
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(apply
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values
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(syntax-local-lift-values-expression
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4
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(quasisyntax/loc stx
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(letrec-values ([(struct:CLOSURE make-CLOSURE CLOSURE? CLOSURE-ref CLOSURE-set!)
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(make-struct-type
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'#,label ;; the tag goes here
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#f ; no super type
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1
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0 ; number of auto-fields
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#f ; auto-v
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; prop-vals:
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(list (cons prop:serializable #,CLOSURE:serialize-info-id)
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(cons prop:procedure
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(#%plain-lambda (clsr . args)
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(let-values ([#,fvars ((CLOSURE-ref clsr 0))])
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(apply #,stx args)))))
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#f ; inspector
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;; the struct apply proc:
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#f)]
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[(CLOSURE-env)
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(#%plain-lambda (clsr) (CLOSURE-ref clsr 0))]
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[(CLOSURE-set-env!)
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(#%plain-lambda (clsr new-env) (CLOSURE-set! clsr 0 new-env))])
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(set-box! #,CLOSURE-env-box CLOSURE-env)
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(set-box! #,CLOSURE-set-env!-box CLOSURE-set-env!)
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(set-box! #,make-CLOSURE-box make-CLOSURE)
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(values make-CLOSURE CLOSURE? CLOSURE-env CLOSURE-set-env!))))))
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; Provide the deserializer (req deserializer identifier)
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(syntax-local-lift-provide
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(quasisyntax/loc stx
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#,CLOSURE:deserialize-info-id))
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(values make-CLOSURE-id CLOSURE?-id CLOSURE-env-id))
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(define (make-closure stx)
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(syntax-case stx ()
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[(_ label lambda-stx)
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(let*-values
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([(lambda-fe-stx) (local-expand #'lambda-stx 'expression empty)]
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[(fvars) (free-vars lambda-fe-stx)]
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; Define the closure struct (req serialize info value)
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[(make-CLOSURE-id CLOSURE?-id CLOSURE-env-id)
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(define-closure! #'label fvars lambda-fe-stx)])
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; Instantiate the closure
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(quasisyntax/loc stx
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(#,make-CLOSURE-id (#%plain-lambda () (values #,@fvars)))))]))
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(provide
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make-closure
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define-closure!)
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