111 lines
4.0 KiB
Racket
111 lines
4.0 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 ([operator : Expression]
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[operands : (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-type UnlabeledStatement (U
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AssignImmediateStatement
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AssignPrimOpStatement
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PerformStatement
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TestStatement
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BranchLabelStatement
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GotoStatement
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SaveStatement
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RestoreStatement))
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(define-type Statement (U UnlabeledStatement
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Symbol ;; label
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))
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(define-struct: AssignImmediateStatement ([target : Symbol]
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[value : (U Const Reg Label)])
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#:transparent)
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(define-struct: AssignPrimOpStatement ([target : Symbol]
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[op : Symbol]
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[rands : (Listof (U Label Reg Const))])
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#:transparent)
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(define-struct: PerformStatement ([op : Symbol]
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[rands : (Listof (U Label Reg Const))]) #:transparent)
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(define-struct: TestStatement ([op : (U 'false? 'primitive-procedure?)]
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[register-rand : Symbol]) #:transparent)
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(define-struct: BranchLabelStatement ([label : Symbol]) #:transparent)
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(define-struct: GotoStatement ([target : (U Label Reg)]) #:transparent)
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(define-struct: SaveStatement ([reg : Symbol]) #:transparent)
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(define-struct: RestoreStatement ([reg : Symbol]) #:transparent)
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(define-struct: Label ([name : Symbol]))
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(define-struct: Reg ([name : Symbol]))
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(define-struct: Const ([const : Any]))
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(define-type OpArg (U Const Label Reg))
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(define-type InstructionSequence (U Symbol instruction-sequence))
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(define-struct: instruction-sequence ([needs : (Listof Symbol)]
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[modifies : (Listof Symbol)]
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[statements : (Listof Statement)]) #: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)))))
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(: registers-needed (InstructionSequence -> (Listof Symbol)))
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(define (registers-needed s)
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(if (symbol? s) '() (instruction-sequence-needs s)))
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(: registers-modified (InstructionSequence -> (Listof Symbol)))
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(define (registers-modified s)
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(if (symbol? s) '() (instruction-sequence-modifies s)))
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(: statements (InstructionSequence -> (Listof Statement)))
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(define (statements s)
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(if (symbol? s) (list s) (instruction-sequence-statements s)))
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;; Targets
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(define-type Target Symbol)
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;; Linkage
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(define-type Linkage (U 'return 'next Symbol))
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(define-struct: BasicBlock ([name : Symbol]
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[stmts : (Listof UnlabeledStatement)]) #:transparent)
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