77 lines
2.1 KiB
Scheme
77 lines
2.1 KiB
Scheme
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; Copyright (c) 1993, 1994 Richard Kelsey and Jonathan Rees. See file COPYING.
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; Commands for writing images.
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; A heap image written using ,dump or ,build can be invoked with
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; s48 -i <filename> [-h <heap size>] [-a <argument>]
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; For images made with ,build <exp> <filename>, <argument> is passed as
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; a string to the procedure that is the result of <exp>.
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; dump <filename>
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(define-command-syntax 'dump "<filename>"
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"write the current heap to an image file"
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'(filename &opt form))
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(define (dump filename . maybe-info)
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(let ((info (if (null? maybe-info) "(suspended image)" (car maybe-info)))
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(context (user-context))
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(env (environment-for-commands)))
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(build-image (lambda (arg)
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(with-interaction-environment env
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(lambda ()
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(start-command-processor arg
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context
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;; env
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(lambda ()
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(greet-user info))))))
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filename)))
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; build <exp> <filename>
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(define-command-syntax 'build "<exp> <filename>"
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"build a heap image file with <exp> as entry procedure"
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'(expression filename))
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(define (build exp filename)
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(build-image (evaluate exp (environment-for-commands)) filename))
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; build-image
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(define (build-image start filename)
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(let ((filename (translate filename)))
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(write-line (string-append "Writing " filename) (command-output))
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(flush-the-symbol-table!) ;Gets restored at next use of string->symbol
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(write-image filename
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(stand-alone-resumer start)
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"")
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#t))
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(define (stand-alone-resumer start)
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(usual-resumer ;sets up exceptions, interrupts, and current input & output
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(lambda (arg)
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(call-with-current-continuation
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(lambda (halt)
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(with-handler (simple-condition-handler halt (error-output-port))
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(lambda ()
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(start arg))))))))
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; Simple condition handler for stand-alone programs.
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(define (simple-condition-handler halt port)
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(lambda (c punt)
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(cond ((error? c)
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(display-condition c port)
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(halt 1))
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((warning? c)
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(display-condition c port)) ;Proceed
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((interrupt? c)
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;; (and ... (= (cadr c) interrupt/keyboard)) ?
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(halt 2))
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(else
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(punt)))))
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;(define interrupt/keyboard (enum interrupt keyboard))
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