224 lines
6.6 KiB
Scheme
224 lines
6.6 KiB
Scheme
; Copyright (c) 1993, 1994 Richard Kelsey and Jonathan Rees. See file COPYING.
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;(define-syntax assert
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; (lambda ignore
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; ''assert))
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(define debugging? #t)
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; ,bench
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; ,load rts/defenum.scm
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; ,for-syntax ,load my-vm/for-syntax.scm
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; ,load my-vm/s48-prescheme.scm my-vm/util.scm my-vm/memory.scm
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; ,load my-vm/arch.scm my-vm/data.scm my-vm/struct.scm
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; ,load link/s48-features.scm link/read-image.scm
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; ,load-into extended-numbers misc/bigbit.scm
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(define (resume filename arg)
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(call-startup-procedure (extract (read-image filename)) arg))
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(define (call-startup-procedure proc arg)
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(proc arg (current-input-port) (current-output-port)))
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(define level 14)
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(define (read-image filename)
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(call-with-input-file filename
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(lambda (port)
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(read-page port) ; read past any user cruft at the beginning of the file
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(let* ((old-level (read-number port))
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(old-bytes-per-cell (read-number port))
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(old-begin (cells->a-units (read-number port)))
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(old-hp (cells->a-units (read-number port)))
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(startup-proc (read-number port)))
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(read-page port)
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(if (not (= old-level level))
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(error "format of image is incompatible with this version of system"
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old-level level))
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(if (not (= old-bytes-per-cell bytes-per-cell))
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(error "incompatible bytes-per-cell"
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old-bytes-per-cell bytes-per-cell))
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;; ***CHANGED***
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(create-memory (a-units->cells (- (addr1+ old-hp) old-begin))
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quiescent)
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(set! *hp* 0)
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(let* ((delta (- *hp* old-begin))
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(new-hp (+ old-hp delta)))
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(let ((reverse? (check-image-byte-order port)))
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(read-block port *memory* *hp* (- old-hp old-begin))
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(if reverse?
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(reverse-byte-order new-hp))
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(if (= delta 0)
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(set! *hp* new-hp)
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(relocate-image delta new-hp))
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(set! *extracted* (make-vector (a-units->cells *memory-end*) #f))
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(adjust startup-proc delta)))))))
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(define (check-image-byte-order port)
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(read-block port *memory* *hp* (cells->a-units 1))
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(cond ((= (fetch *hp*) 1)
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#f)
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(else
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(reverse-descriptor-byte-order! *hp*)
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(if (= (fetch *hp*) 1)
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#t
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(begin (error "unable to correct byte order" (fetch *hp*))
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#f)))))
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(define *hp* 0)
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(define *extracted* #f)
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(define (extract obj)
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(cond ((vm-fixnum? obj) (extract-vm-fixnum obj))
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((stob? obj)
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(let ((index (a-units->cells (address-after-header obj))))
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(or (vector-ref *extracted* index)
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(extract-stored-object obj
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(lambda (new)
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(vector-set! *extracted* index new)
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new)))))
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((vm-char? obj) (extract-char obj))
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((vm-eq? obj null) '())
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((vm-eq? obj false) #f)
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((vm-eq? obj true) #t)
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((vm-eq? obj vm-unspecific) (if #f 0))
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((vm-eq? obj unbound-marker) '<unbound>)
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((vm-eq? obj unassigned-marker) '<unassigned>)
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(else (error "random descriptor" obj))))
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(define (extract-stored-object old store-new!)
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((vector-ref stored-object-extractors (header-type (stob-header old)))
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old store-new!))
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(define stored-object-extractors
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(make-vector stob-count (lambda rest (apply error "no extractor" rest))))
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(define (define-extractor which proc)
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(vector-set! stored-object-extractors which proc))
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(define-extractor stob/pair
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(lambda (old store-new!)
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(let ((new (cons #f #f)))
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(store-new! new)
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(set-car! new (extract (vm-car old)))
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(set-cdr! new (extract (vm-cdr old)))
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new)))
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(define-extractor stob/vm-closure
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(lambda (old store-new!)
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(store-new! (make-closure (extract (vm-closure-template old))
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(extract (vm-closure-env old))))))
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(define-extractor stob/symbol
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(lambda (obj store-new!)
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(store-new! (string->symbol (extract (vm-symbol->string obj))))))
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(define-extractor stob/vm-location
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(lambda (obj store-new!)
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(let ((new (store-new! (make-undefined-location
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(+ 10000
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(extract (vm-location-id obj))))))
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(val (vm-contents obj)))
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(if (not (vm-eq? val unbound-marker))
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(begin (set-location-defined?! new #t)
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(if (not (vm-eq? val unassigned-marker))
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(set-contents! new (extract val)))))
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new)))
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(define-extractor stob/string
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(lambda (obj store-new!)
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(store-new! (extract-string obj))))
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(define-extractor stob/vm-code-vector
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(lambda (obj store-new!)
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(store-new! (extract-code-vector obj))))
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(define-extractor stob/vector
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(lambda (obj store-new!)
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(let* ((z (vm-vector-length obj))
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(v (make-vector z)))
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(store-new! v)
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(do ((i 0 (+ i 1)))
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((= i z) v)
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(vector-set! v i (extract (vm-vector-ref obj i)))))))
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;(define-extractor stob/record
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; (lambda (obj store-new!)
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; (let* ((z (vm-record-length obj))
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; (v (make-record z)))
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; (store-new! v)
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; (do ((i 0 (+ i 1)))
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; ((= i z) v)
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; (record-set! v i (extract (vm-record-ref obj i)))))))
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(define-extractor stob/port
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(lambda (obj store-new!)
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(store-new!
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(case (extract-vm-fixnum (port-index obj))
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((0) (current-input-port))
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((1) (current-output-port))
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(else (error "unextractable port" obj))))))
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(define (extract-code-vector x)
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(let ((z (vm-code-vector-length x)))
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(let ((v (make-code-vector z 0)))
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(do ((i 0 (+ i 1)))
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((>= i z) v)
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(code-vector-set! v i (vm-code-vector-ref x i))))))
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; Various things copied from vm/gc.scm
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(define (store-next! descriptor)
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(store! *hp* descriptor)
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(set! *hp* (addr1+ *hp*)))
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(define (reverse-descriptor-byte-order! addr)
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(let ((x (fetch-byte addr)))
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(store-byte! addr (fetch-byte (addr+ addr 3)))
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(store-byte! (addr+ addr 3) x))
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(let ((x (fetch-byte (addr+ addr 1))))
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(store-byte! (addr+ addr 1) (fetch-byte (addr+ addr 2)))
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(store-byte! (addr+ addr 2) x)))
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(define (reverse-byte-order end)
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(write-string "Correcting byte order of resumed image."
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(current-output-port))
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(newline (current-output-port))
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(let loop ((ptr *hp*))
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(reverse-descriptor-byte-order! ptr)
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(let ((value (fetch ptr)))
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(if (addr< ptr end)
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(loop (if (b-vector-header? value)
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(addr+ (addr1+ ptr) (header-a-units value))
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(addr1+ ptr)))))))
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(define (adjust descriptor delta)
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(if (stob? descriptor)
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(make-stob-descriptor (addr+ (address-after-header descriptor) delta))
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descriptor))
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(define (relocate-image delta new-hp)
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(let loop ()
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(cond ((addr< *hp* new-hp)
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(let ((d (adjust (fetch *hp*) delta)))
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(store-next! d)
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(cond ;;((eq? d the-primitive-header)
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;; Read symbolic label name.
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;;(store-next!
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;; (label->fixnum (name->label (read port)))))
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((b-vector-header? d)
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(set! *hp* (addr+ *hp*
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(cells->bytes
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(bytes->cells
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(header-length-in-bytes d)))))))
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(loop))))))
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