82 lines
2.5 KiB
Racket
82 lines
2.5 KiB
Racket
#lang racket
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(require "il-structs.rkt"
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"simulator-structs.rkt"
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"simulator.rkt")
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(define-syntax (test stx)
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(syntax-case stx ()
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[(_ actual exp)
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(with-syntax ([stx stx])
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(syntax/loc #'stx
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(let ([results (with-handlers ([exn:fail?
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(lambda (exn)
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(raise-syntax-error #f (format "Exception happened: ~s"
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(exn-message exn))
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#'stx))])
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actual)])
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(unless (equal? actual exp)
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(raise-syntax-error #f (format "Expected ~s, got ~s" exp results)
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#'stx)))))]))
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;; take n steps in evaluating the machine.
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(define (step-n m n)
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(cond
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[(= n 0)
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m]
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[else
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(step-n (step m) (sub1 n))]))
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;; run: machine -> machine
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;; Run the machine to completion.
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(define (run m)
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(cond
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[(can-step? m)
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(run (step m))]
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[else
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m]))
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(let ([m (new-machine `(hello world ,(make-GotoStatement (make-Label 'hello))))])
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(test (machine-pc (step-n m 0)) 0)
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(test (machine-pc (step-n m 1)) 1)
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(test (machine-pc (step-n m 2)) 2)
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(test (machine-pc (step-n m 3)) 1)
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(test (machine-pc (step-n m 4)) 2)
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(test (machine-pc (step-n m 5)) 1))
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;; Assigning to val
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(let ([m (new-machine `(,(make-AssignImmediateStatement 'val (make-Const 42))))])
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(test (machine-val m) (void))
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(test (machine-val (step m)) 42))
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;; Assigning to proc
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(let ([m (new-machine `(,(make-AssignImmediateStatement 'proc (make-Const 42))))])
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(test (machine-proc m) (void))
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(test (machine-proc (step m)) 42))
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;; Assigning to a environment reference
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(let* ([m (new-machine `(,(make-PushEnvironment 1)
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,(make-AssignImmediateStatement (make-EnvLexicalReference 0) (make-Const 42))))]
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[m (run m)])
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(test (machine-env m) '(42)))
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;; Assigning to another environment reference
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(let* ([m (new-machine `(,(make-PushEnvironment 2)
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,(make-AssignImmediateStatement (make-EnvLexicalReference 1) (make-Const 42))))]
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[m (run m)])
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(test (machine-env m) `(,(void) 42)))
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;; Assigning to another environment reference
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(let* ([m (new-machine `(,(make-PushEnvironment 2)
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,(make-AssignImmediateStatement (make-EnvLexicalReference 0) (make-Const 42))))]
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[m (run m)])
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(test (machine-env m) `(42 ,(void))))
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