44 lines
1.7 KiB
Racket
44 lines
1.7 KiB
Racket
#lang typed/racket/base
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(provide (all-defined-out))
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(define-type Expression (U Constant Quote Var Assign Branch Def Lam Seq App))
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(define-struct: Constant ([v : Any]) #:transparent)
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(define-struct: Quote ([text : Any]) #:transparent)
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(define-struct: Var ([id : Symbol]) #:transparent)
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(define-struct: Assign ([variable : Symbol]
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[value : Expression]) #:transparent)
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(define-struct: Branch ([predicate : Expression]
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[consequent : Expression]
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[alternative : Expression]) #:transparent)
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(define-struct: Def ([variable : Symbol]
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[value : Expression]) #:transparent)
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(define-struct: Lam ([parameters : (Listof Symbol)]
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[body : (Listof Expression)]) #:transparent)
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(define-struct: Seq ([actions : (Listof Expression)]) #:transparent)
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(define-struct: App ([op : Expression]
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[rands : (Listof Expression)]) #:transparent)
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(: last-exp? ((Listof Expression) -> Boolean))
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(define (last-exp? seq)
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(null? (cdr seq)))
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(: first-exp ((Listof Expression) -> Expression))
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(define (first-exp seq) (car seq))
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(: rest-exps ((Listof Expression) -> (Listof Expression)))
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(define (rest-exps seq) (cdr seq))
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;; instruction sequences
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(define-struct: instruction-sequence ([needs : (Listof Symbol)]
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[modifies : (Listof Symbol)]
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[statements : (Listof Any)]) #:transparent)
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(define empty-instruction-sequence (make-instruction-sequence '() '() '()))
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(: make-label (Symbol -> Symbol))
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(define make-label
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(let ([n 0])
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(lambda (l)
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(set! n (add1 n))
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(string->symbol (format "~a~a" l n))))) |