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|
; Part of Scheme 48 1.9. See file COPYING for notices and license.
; Authors: Richard Kelsey, Jonathan Rees, David Frese, Mike Sperber
; Read-image
(define (s48-read-image image-filename max-heap-size)
(init-read-image!)
(receive (port status)
(open-input-file image-filename)
(if (error? status)
(begin
(error-message "Can't open heap image file")
(error-message (error-string status))
-1)
(receive (status format)
(check-image-header port)
(cond
;; Read in the ASCII portion of the image and make
;; sure that it is compatible with this version of
;; the VM.
((got-error? status) -1)
;; now we can initialize the heap
((got-error? (initialize-heap! max-heap-size)) -1)
;; allocate space and copy the objects (image => heap)
((got-error? (read-image-to-heap format port)) -1)
(else 0)))))) ; Everything OK
; reads image objects into the heap object
(define (read-image-to-heap image-format port)
(really-read-image image-format (check-byte-order port) port))
(define (check-byte-order port)
(let ((new-addr (allocate-memory (cells->bytes 1))))
(receive (okay? msg)
(image-read-block port new-addr (cells->a-units 1))
(if (not okay?)
(error "byte order check failed"))
(cond ((= (fetch new-addr) false)
(deallocate-memory new-addr)
#f)
(else
(reverse-descriptor-byte-order! new-addr)
(if (not (= (fetch new-addr) false))
(error "Unable to correct byte order"))
(deallocate-memory new-addr)
#t)))))
(define (check-image-header port)
;; Skip page-char (start of the image-header)
(read-check (read-page port))
;; Skip newline-char (version starts on next line)
(read-check (read-newline port))
;; Read version, bytes/cell and co.
(let* ((same-version? (read-check (check-image-version port) #f))
(format (read-check (check-image-format port) -1))
(old-bytes-per-cell (read-check (read-integer port))))
;; Is everything OK?
(values (cond ((error? (get-status))
(read-lost "Error reading from image file" port))
((is-eof?) ; has to come after *status* check
(set-status! (enum errors parse-error))
(read-lost "Premature EOF when reading image file" port))
((not same-version?)
(read-lost "Format of image is incompatible with this version of system"
port))
((not (valid-image-format? format))
(read-lost "Unknown image format" port))
((not (= old-bytes-per-cell bytes-per-cell))
(read-lost "Incompatible bytes-per-cell in image" port))
(else
(check-all-data! format port)
(set-symbols! (read-check (read-integer port)))
(set-imported-bindings! (read-check (read-integer port)))
(set-exported-bindings! (read-check (read-integer port)))
(set-resumer-records! (read-check (read-integer port)))
(set-startup-procedure! (read-check (read-integer port)))
;; Skip page-char (end of the image-header = begin of image-heap)
(read-check (read-page port))
0))
format)))
(define (check-image-version port)
(let ((len (string-length architecture-version)))
(let loop ((i 0))
(receive (ch eof? status)
(read-char port)
(cond ((or eof? (error? status))
(values #f eof? status))
((= i len)
(values (char=? #\newline ch) #f status))
((char=? ch (string-ref architecture-version i))
(loop (+ i 1)))
(else
(values #f #f status)))))))
(define (check-image-format port)
(receive (n eof? status)
(read-integer port)
(values n eof? status)))
(define (check-all-data! format port)
(enum-case image-format format
((two-space)
(set-img-start-addr!
(integer->address
(cells->a-units (read-check (read-integer port)))))
(set-img-end-addr!
(integer->address
(cells->a-units (read-check (read-integer port)))))
(set-img-heap-size!
(bytes->cells (address-difference (get-img-end-addr)
(get-img-start-addr)))))
((bibop)
;; Read all to calculate the real size
(let* ((sb (cells->a-units (read-check (read-integer port))))
(sh (cells->a-units (read-check (read-integer port))))
(se (cells->a-units (read-check (read-integer port))))
(lb se)
(lh (cells->a-units (read-check (read-integer port))))
(le (cells->a-units (read-check (read-integer port))))
(wb le)
(wh (cells->a-units (read-check (read-integer port))))
(we (cells->a-units (read-check (read-integer port)))))
(set-small-img-start-addr! (integer->address sb))
(set-small-img-hp-addr! (integer->address sh))
(set-small-img-end-addr! (integer->address se))
(set-large-img-start-addr! (integer->address lb))
(set-large-img-hp-addr! (integer->address lh))
(set-large-img-end-addr! (integer->address le))
(set-weaks-img-start-addr! (integer->address wb))
(set-weaks-img-hp-addr! (integer->address wh))
(set-weaks-img-end-addr! (integer->address we))
;; These are going to be read from the image (port)
(set-small-img-heap-size! (a-units->cells (- sh sb)))
(set-large-img-heap-size! (a-units->cells (- lh lb)))
(set-weaks-img-heap-size! (a-units->cells (- wh wb)))
;; This image is WLS
(set-img-start-addr! (integer->address wb))
(set-img-end-addr! (integer->address sh))
;; This is going to be allocated (so we need the
;; real whole size to have 1:1 addresses)
(set-img-heap-size! (+ (a-units->cells (- se sb))
(a-units->cells (- le lb))
(a-units->cells (- we wb))))))
(else (error "check-all-data!: Unknown image format (this can't happen)"))))
(define (initialize-heap! max-heap-size)
(s48-initialize-heap max-heap-size
(get-img-start-addr) (get-img-heap-size))
(initialize-image-areas!)
(s48-check-heap-size!)
0) ; for the type checker
;----------------
; Save initial values across any GC's.
(define *initializing?* #t)
(define (s48-initializing-gc-root)
(if *initializing?*
(begin
(set-startup-procedure! (s48-trace-value (get-startup-procedure)))
(set-symbols! (s48-trace-value (get-symbols)))
(set-imported-bindings! (s48-trace-value (get-imported-bindings)))
(set-exported-bindings! (s48-trace-value (get-exported-bindings)))
(set-resumer-records! (s48-trace-value (get-resumer-records))))))
; For the outside world.
(define (s48-startup-procedure) (get-startup-procedure))
(define (s48-initial-symbols) (get-symbols))
(define (s48-initial-imported-bindings) (get-imported-bindings))
(define (s48-initial-exported-bindings) (get-exported-bindings))
(define (s48-resumer-records) (get-resumer-records))
(define (s48-initialization-complete!)
(set! *initializing?* #f))
; For resuming static images.
(define (s48-set-image-values! startup-proc symbols imports exports records)
(set-startup-procedure! startup-proc)
(set-symbols! symbols)
(set-imported-bindings! imports)
(set-exported-bindings! exports)
(set-resumer-records! records))
; #### needs to be generalized
; (define (s48-relocate-all delta new-begin new-hp symbols imported exported)
; (relocate-symbol-table-two-space! symbols delta)
; (relocate-binding-table-two-space! imported delta)
; (relocate-binding-table-two-space! exported delta)
; (relocate-image delta new-begin new-hp))
; for debugging
(define (get-all-globals)
(write-out-string "(get-status): ")
(if (eq? (get-status)
(enum errors no-errors))
(write-out-string "no-errors ")
(write-out-string "errors "))
(write-out-newline)
(write-out-string "(is-eof?): ")
(if (is-eof?)
(write-out-string "EOF ")
(write-out-string "NOT EOF "))
(write-out-newline)
(write-out-string "null-address: ")
(write-out-integer (address->integer null-address))
(write-out-newline)
(write-out-string "(get-img-start-addr): ")
(write-out-integer (address->integer (get-img-start-addr)))
(write-out-newline)
(write-out-string "(get-img-end-addr): ")
(write-out-integer (address->integer (get-img-end-addr)))
(write-out-newline)
(write-out-string "(get-img-heap-size): ")
(write-out-integer (get-img-heap-size))
(write-out-newline)
(write-out-string "(get-startup-procedure): ")
(write-out-integer (get-startup-procedure))
(write-out-newline)
(write-out-string "(get-symbols): ")
(write-out-integer (get-symbols))
(write-out-newline)
(write-out-string "(get-imported-bindings): ")
(write-out-integer (get-imported-bindings))
(write-out-newline)
(write-out-string "(get-exported-bindings): ")
(write-out-integer (get-exported-bindings))
(write-out-newline)
(write-out-string "(get-resumer-records): ")
(write-out-integer (get-resumer-records))
(write-out-newline)
)
|
