144 lines
4.4 KiB
Racket
144 lines
4.4 KiB
Racket
#lang racket
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(require "proto.rkt")
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(module+ test
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(require rackunit)
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(require "test-utils.rkt"))
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;; a SpinProgram is a
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;; (sprog [Assignment [Listof SpinProcess]])
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(struct sprog [assignment procs] #:transparent)
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;; a SpinProcess is a
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;; (sproc SName Assignment [Setof SpinState])
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(struct sproc [name init states] #:transparent)
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;; an Assignment is a [Hashof SVar SValue]
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;; a SName is a Symbol that is a legal variable name in Spin
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;; a SVar is a
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;; (svar SName SType)
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(struct svar [name ty] #:transparent)
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;; a SValue is one of
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;; - Int
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;; - Bool
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;; - SName
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;; and must be a valid Spin literal
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;; a SType is one of
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;; - 'SInt
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;; - 'SBool
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;; - 'mtype
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(define SInt 'SInt)
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(define SBool 'SBool)
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(define mtype 'mtype)
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;; a SpinState is a
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;; (sstate SName [Sequenceof SBranch])
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(struct sstate [name branches] #:transparent)
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;; a SBranch is a
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;; (sbranch D+ SName [Listof SAction])
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(struct sbranch [event dest actions] #:transparent)
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;; a SAction is one of
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;; - (assert ?)
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;; - (retract ?)
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;; - (send ?)
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;; - (incorporate D+)
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(struct assert [ty] #:transparent)
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(struct retract [ty] #:transparent)
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;; send defined in proto.rkt
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(struct incorporate [evt] #:transparent)
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;; each process has a local variable that determines its current state
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(define CURRENT-STATE (svar 'current mtype))
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;; TODO - think about how to handle subtype relationship between assertions
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;; [Sequenceof RoleGraph] -> SpinProgram
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(define (compile-program rgs)
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(define globals (initial-assertion-vars-for rgs))
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(define procs (for/list ([rg rgs]) (compile-spin rg)))
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(sprog globals procs))
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;; RoleGraph -> SpinProcess
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(define (compile-spin rg #:name [name (gensym 'proc)])
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(match-define (role-graph st0 states) rg)
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(define all-events (all-event-types (in-hash-values states)))
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(define states- (for/list ([st (in-hash-values states)])
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(compile-state st states)))
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(define assignment (local-variables-for st0 all-events))
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(sproc name assignment (list->set states-)))
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;; [Sequenceof RoleGraph] -> Assignment
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(define (initial-assertion-vars-for rgs)
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(define potential-assertions (all-assertions rgs))
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(for/hash ([τ (in-set potential-assertions)])
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(values (svar τ SInt)
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0)))
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;; [Sequenceof RoleGraph] -> [Setof τ]
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(define (all-assertions rgs)
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;; RoleGraph -> (Setof τ)
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(define (all-assertions-of rg)
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(for*/set ([st (in-hash-values (role-graph-states rg))]
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[τ (in-set (state-assertions st))])
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τ))
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(for/fold ([as (set)])
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([rg rgs])
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(set-union as (all-assertions-of rg))))
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;; [Sequenceof State] -> ?
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(define (all-event-types states)
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(for*/set ([st states]
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[D+ (in-hash-keys (state-transitions st))])
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(match D+
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[(or (Asserted τ) (Retracted τ))
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τ]
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[(Message τ)
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(raise-argument-error 'all-event-types "messages not supported yet" D+)]
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[_
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(raise-argument-error 'all-event-types "internal events not allowed" D+)])))
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;; StateName [Setof τ] -> Assignment
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(define (local-variables-for st0 all-events)
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(define assign
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(for/hash ([evt (in-set all-events)])
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(values (svar evt SBool)
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#f)))
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(hash-set assign CURRENT-STATE st0))
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;; State -> SpinState
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(define (compile-state st states)
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(match-define (state name transitions assertions) st)
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(define branches (for*/list ([(D+ txns) (in-hash transitions)]
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[txn (in-set txns)])
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(match-define (transition effs dest) txn)
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(match-define (state _ _ dest-assertions) (hash-ref states dest))
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(branch-on D+ assertions dest dest-assertions effs)))
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(sstate name branches))
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;; D+ [Setof τ] SName [Setof τ] [Listof TransitionEffect] -> SBranch
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(define (branch-on D+ curr-assertions dest dest-assertions effs)
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(define new-assertions (set-subtract dest-assertions curr-assertions))
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(define retractions (set-subtract curr-assertions dest-assertions))
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(define asserts (set-map new-assertions assert))
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(define retracts (set-map retractions retract))
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(unless (andmap send? effs)
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(raise-argument-error 'branch-on "all external effects" effs))
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(sbranch D+ dest (cons (incorporate D+)
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(append asserts retracts effs))))
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(module+ test
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(test-case
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"sanity: compile book seller type"
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(define/timeout seller-rg (compile seller-actual))
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(define/timeout seller-spin (compile-spin seller-rg))
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(check-true (sproc? seller-spin))))
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