112 lines
4.3 KiB
Scheme
112 lines
4.3 KiB
Scheme
; -*- Mode: Scheme; Syntax: Scheme; Package: Scheme; -*-
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; Copyright (c) 1993-1999 by Richard Kelsey and Jonathan Rees. See file COPYING.
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; To load the VM into Scheme 48:
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; ,exec ,load load-vm.scm
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;
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; You must have already loaded Pre-Scheme.
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;
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; Then, for example,
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; (start-vm "=scheme48/../../build/initial.image" 4000000 20000 '#())
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; in the user package will start up the VM with the initial image.
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; Be patient. It will take a while. Running the initial image as
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; above on a SGI Indy (100 mhz R4000) it took over 70 minutes to
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; get the - prompt. scheme48.image starts up faster as it does little
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; in the way of initialization. See below for a way to build a small
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; image that will start up quickly.
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;
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; You will need to have a large heap to start with. -h 12000000 works
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; for loading the initial image in version 0.35, smaller heaps may also
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; work.
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;
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; To send input to the VM, do the following:
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;
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; Breakpoint: Waiting
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; 1> ,in interpreter (set! s48-*pending-events?* #t)
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; 1> ,proceed
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; (+ 2 3) ; this will be read by the loaded VM
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; Call to (schedule-interrupt 200) ; output noise
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; Call to (schedule-interrupt 200)
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; Call to (schedule-interrupt 200)
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; 5 ; the answer
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; > Call to (schedule-interrupt 200) ; prompt by the loaded S48
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;
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; Breakpoint: Waiting
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; 1> ; prompt by the base S48
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;
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; There can't be a pause between the `,proceed 0' and the input for
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; the loaded VM. This is easy to accomplish running under Emacs.
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; If there is a pause you will hit the breakpoint again and the
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; `(+ 2 3)' or whatever will be read by the base system.
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;
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; It is easier to debug changes to the VM using images smaller than
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; the usual build/initial.image and scheme48.image. What I usually
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; do is modify scheme/debug/tiny.scm so that it runs the code I want
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; to test and then build scheme/debug/tiny.image. The version that
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; comes with the system prints `Hello' and the first command argument,
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; if any, then reads a line from standard input and prints it to
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; standard output. The image file is less than 12k bytes in size so
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; it starts up much faster than the larger images. Here is a transcript:
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;
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; % make scheme/debug/tiny.image
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; (echo ',batch' && echo ',bench on'; \
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; echo \(load-configuration \"scheme/debug/tiny-packages.scm\"\); \
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; echo \(link-simple-system \'\(scheme/debug tiny\) \'start tiny-system\)) \
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; | ./scheme48vm -h 5000000 -i build/linker.image
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; Welcome to Scheme 48 0.45 (suspended image).
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; Copyright (c) 1993, 1994 by Richard Kelsey and Jonathan Rees.
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; Copyright (c) 1996 by NEC Research Institute, Inc.
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; Please report bugs to scheme-48-bugs@martigny.ai.mit.edu.
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; Type ,? (comma question-mark) for help.
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; > Will exit on errors
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; Will compile some calls in line
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; scheme/debug/tiny-packages.scm
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; [tiny-system
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; scheme/debug/tiny.scm ]
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; Writing scheme/debug/tiny.debug
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;
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; % ./scheme48vm -i scheme/debug/tiny.image -a the-argument
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; Correcting byte order of resumed image.
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; Hello the-argument
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; now I type a line to be echoed
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; now I type a line to be echoed
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; %
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;
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; When modifying scheme/debug/tiny.scm you have to keep in mind that
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; you can only use the basic system: only the standard special forms
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; (no LET, for example) and only the primitives implemented by the
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; VM (no MAP, etc.).
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(config)
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(load "interfaces.scm")
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(load "s48-package-defs.scm")
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(load "package-defs.scm")
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(load-package 'destructuring) ; used in FOR-SYNTAX clause
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(load-package 'bigbit)
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(load-package 'vm)
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(user)
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(open 'ps-memory)
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(open 'vm)
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(open 'heap-init)
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(open 'images)
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(open 'memory-debug)
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(run '
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(define (start-vm image-file heap-size stack-size start-args)
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(reinitialize-memory)
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(let ((needed-space (+ (quotient (s48-check-image-header image-file) 4))))
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(cond ((< heap-size (* 16 needed-space))
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(display "Heap too small, want at least ")
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(display (* 16 needed-space))
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(newline))
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(else
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(let ((heap (allocate-memory heap-size))
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(stack (allocate-memory stack-size)))
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(s48-initialize-heap heap (quotient heap-size 4))
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(s48-read-image)
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(s48-initialize-vm stack (quotient stack-size 4))
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(s48-call-startup-procedure start-args
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(vector-length start-args)))))))
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)
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