260 lines
8.2 KiB
Racket
260 lines
8.2 KiB
Racket
#lang typed/racket/base
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(provide (all-defined-out))
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(require "lexical-structs.rkt")
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Registers of the machine:
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(define-type StackRegisterSymbol (U 'control 'env))
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(define-type AtomicRegisterSymbol (U 'val 'proc))
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(define-type RegisterSymbol (U StackRegisterSymbol AtomicRegisterSymbol))
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(define-predicate AtomicRegisterSymbol? AtomicRegisterSymbol)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; An operation can refer to the following arguments:
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(define-type OpArg (U Const ;; an constant
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Label ;; an label
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Reg ;; an register
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EnvLexicalReference ;; a reference into the stack
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EnvPrefixReference ;; a reference into an element in the toplevel.
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EnvWholePrefixReference ;; a reference into a toplevel prefix in the stack.
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))
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;; Targets: these are the allowable lhs's for an assignment.
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(define-type Target (U AtomicRegisterSymbol
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EnvLexicalReference
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EnvPrefixReference
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PrimitivesReference))
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(define-struct: Label ([name : Symbol])
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#:transparent)
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(define-struct: Reg ([name : AtomicRegisterSymbol])
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#:transparent)
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(define-struct: Const ([const : Any])
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#:transparent)
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(define-struct: PrimitivesReference ([name : Symbol])
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#:transparent)
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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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GotoStatement
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TestAndBranchStatement
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PopEnvironment
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PushEnvironment
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PushControlFrame
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PopControlFrame))
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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 : Target]
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[value : OpArg])
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#:transparent)
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(define-struct: AssignPrimOpStatement ([target : Target]
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[op : PrimitiveOperator])
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#:transparent)
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;; Pop n slots from the environment, skipping past a few first.
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(define-struct: PopEnvironment ([n : Natural]
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[skip : Natural])
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#:transparent)
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(define-struct: PushEnvironment ([n : Natural]
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[unbox? : Boolean])
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#:transparent)
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(define-struct: PopControlFrame ()
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#:transparent)
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;; Adding a frame for getting back after procedure application.
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;; The 'proc register must hold either #f or a closure at the time of
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;; this call, as the control frame will hold onto the called procedure record.
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(define-struct: PushControlFrame ([label : Symbol])
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#:transparent)
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(define-struct: GotoStatement ([target : (U Label Reg)])
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#:transparent)
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(define-struct: PerformStatement ([op : PrimitiveCommand])
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#:transparent)
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(define-struct: TestAndBranchStatement ([op : PrimitiveTest]
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[register : AtomicRegisterSymbol]
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[label : Symbol])
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#:transparent)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Primitive Operators
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;; The operators that return values, that are used in AssignPrimopStatement.
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(define-type PrimitiveOperator (U GetCompiledProcedureEntry
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MakeCompiledProcedure
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ApplyPrimitiveProcedure
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GetControlStackLabel
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MakeBoxedEnvironmentValue
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CaptureEnvironment
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CaptureControl
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))
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;; Gets the label from the closure stored in the 'proc register and returns it.
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(define-struct: GetCompiledProcedureEntry ()
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#:transparent)
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;; Constructs a closure, given the label, # of expected arguments,
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;; and the set of lexical references into the environment that the
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;; closure needs to close over.
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(define-struct: MakeCompiledProcedure ([label : Symbol]
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[arity : Natural]
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[closed-vals : (Listof Natural)]
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[display-name : (U Symbol False)])
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#:transparent)
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;; Applies the primitive procedure that's stored in the proc register, using
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;; the arity number of values that are bound in the environment as arguments
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;; to that primitive.
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;;
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;; If the primitive needs to capture the current continuation, it can get the
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;; immediate address at label.
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(define-struct: ApplyPrimitiveProcedure ([arity : Natural]
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[label : Symbol])
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#:transparent)
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;; Gets the return address embedded at the top of the control stack.
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(define-struct: GetControlStackLabel ()
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#:transparent)
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(define-struct: MakeBoxedEnvironmentValue ([depth : Natural])
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#:transparent)
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;; Capture the current environment, skipping skip frames.
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(define-struct: CaptureEnvironment ([skip : Natural]))
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;; Capture the control stack, skipping skip frames.
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(define-struct: CaptureControl ([skip : Natural]))
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;; The following is used with TestStatement: each is passed the register-rand and
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;; is expected to
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(define-type PrimitiveTest (U
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;; register -> boolean
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;; Meant to branch when the register value is false.
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'false?
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;; register -> boolean
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;; Meant to branch when the register value is a primitive
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;; procedure
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'primitive-procedure?
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))
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;; Check that the value in the prefix has been defined.
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;; If not, raise an error and stop evaluation.
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(define-struct: CheckToplevelBound! ([depth : Natural]
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[pos : Natural])
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#:transparent)
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;; Check the closure procedure value in 'proc and make sure it can accept n values.
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(define-struct: CheckClosureArity! ([arity : Natural])
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#:transparent)
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;; Extends the environment with a prefix that holds
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;; lookups to the namespace.
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(define-struct: ExtendEnvironment/Prefix! ([names : (Listof (U Symbol False))])
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#:transparent)
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;; Adjusts the environment by pushing the values in the
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;; closure (held in the proc register) into itself.
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(define-struct: InstallClosureValues! ()
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#:transparent)
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;; Changes over the control located at the given argument from the structure in env[1]
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(define-struct: RestoreControl! ())
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;; Changes over the environment located at the given argument from the structure in env[0]
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(define-struct: RestoreEnvironment! ())
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(define-type PrimitiveCommand (U
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CheckToplevelBound!
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CheckClosureArity!
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ExtendEnvironment/Prefix!
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InstallClosureValues!
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RestoreEnvironment!
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RestoreControl!))
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(define-type InstructionSequence (U Symbol instruction-sequence))
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(define-struct: instruction-sequence ([statements : (Listof Statement)])
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#: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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(: 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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;; Linkage
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(define-type Linkage (U 'return
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'next
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Symbol))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Assembly
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(define-struct: BasicBlock ([name : Symbol]
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[stmts : (Listof UnlabeledStatement)])
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#:transparent)
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