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;;; Guile VM Disassembler
;; Copyright (C) 2001 Free Software Foundation, Inc.
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Code:
(define-module (system vm disasm)
#:use-module (system base pmatch)
#:use-module (system vm objcode)
#:use-module (system vm program)
#:use-module (system vm conv)
#:use-module (ice-9 regex)
#:use-module (ice-9 format)
#:use-module (ice-9 receive)
#:export (disassemble-objcode disassemble-program disassemble-bytecode))
(define (disassemble-objcode objcode . opts)
(let* ((prog (objcode->program objcode))
(arity (program-arity prog))
(nlocs (arity:nlocs arity))
(nexts (arity:nexts arity))
(bytes (program-bytecode prog)))
(format #t "Disassembly of ~A:\n\n" objcode)
(format #t "nlocs = ~A nexts = ~A\n\n" nlocs nexts)
(disassemble-bytecode bytes #f 0 #f #f '())))
(define (disassemble-program prog . opts)
(let* ((arity (program-arity prog))
(nargs (arity:nargs arity))
(nrest (arity:nrest arity))
(nlocs (arity:nlocs arity))
(nexts (arity:nexts arity))
(bytes (program-bytecode prog))
(objs (program-objects prog))
(meta (program-meta prog))
(exts (program-external prog))
(binds (program-bindings prog))
(blocs (and binds
(append (list-head binds nargs)
(filter (lambda (x) (not (binding:extp x)))
(list-tail binds nargs)))))
(bexts (and binds
(filter binding:extp binds)))
(srcs (program-sources prog)))
;; Disassemble this bytecode
(format #t "Disassembly of ~A:\n\n" prog)
(format #t "nargs = ~A nrest = ~A nlocs = ~A nexts = ~A\n\n"
nargs nrest nlocs nexts)
(format #t "Bytecode:\n\n")
(disassemble-bytecode bytes objs nargs blocs bexts srcs)
(if (pair? exts)
(disassemble-externals exts))
(if meta
(disassemble-meta prog (meta)))
;; Disassemble other bytecode in it
(for-each
(lambda (x)
(if (program? x)
(begin (display "----------------------------------------\n")
(apply disassemble-program x opts))))
(vector->list objs))))
(define (disassemble-bytecode bytes objs nargs blocs bexts sources)
(let ((decode (make-byte-decoder bytes))
(programs '()))
(define (lp start end code)
(pmatch code
(#f (newline))
((load-program ,x)
(let ((sym (gensym "")))
(set! programs (acons sym x programs))
(print-info start `(load-program ,sym) #f #f)))
(else
(print-info start code
(code-annotation end code objs nargs blocs bexts)
(and=> (assq end sources) source->string))))
(if code (call-with-values decode lp)))
(call-with-values decode lp)
(for-each (lambda (sym+bytes)
(format #t "Bytecode #~A:\n\n" (car sym+bytes))
(disassemble-bytecode (cdr sym+bytes) #f 0 #f #f '()))
(reverse! programs))))
(define (disassemble-objects objs)
(display "Objects:\n\n")
(let ((len (vector-length objs)))
(do ((n 0 (1+ n)))
((= n len) (newline))
(print-info n (vector-ref objs n) #f #f))))
(define (disassemble-externals exts)
(display "Externals:\n\n")
(let ((len (length exts)))
(do ((n 0 (1+ n))
(l exts (cdr l)))
((null? l) (newline))
(print-info n (car l) #f #f))))
(define-macro (unless test . body)
`(if (not ,test) (begin ,@body)))
(define *uninteresting-props* '(name))
(define (disassemble-meta program meta)
(let ((sources (cadr meta))
(props (filter (lambda (x)
(not (memq (car x) *uninteresting-props*)))
(cddr meta))))
(unless (null? props)
(display "Properties:\n\n")
(for-each (lambda (x) (print-info #f x #f #f)) props)
(newline))))
(define (source->string src)
(format #f "~a:~a:~a" (or (source:file src) "(unknown file)")
(source:line src) (source:column src)))
(define (make-int16 byte1 byte2)
(+ (* byte1 256) byte2))
(define (code-annotation end-addr code objs nargs blocs bexts)
(let* ((code (code-unpack code))
(inst (car code))
(args (cdr code)))
(case inst
((list vector)
(list "~a element~:p" (apply make-int16 args)))
((br br-if br-if-eq br-if-not br-if-not-eq br-if-not-null br-if-null)
(list "-> ~A" (+ end-addr (apply make-int16 args))))
((object-ref)
(and objs (list "~s" (vector-ref objs (car args)))))
((local-ref local-set)
(and blocs
(let ((b (list-ref blocs (car args))))
(list "`~a'~@[ (arg)~]"
(binding:name b) (< (binding:index b) nargs)))))
((external-ref external-set)
(and bexts
(if (< (car args) (length bexts))
(let ((b (list-ref bexts (car args))))
(list "`~a'~@[ (arg)~]"
(binding:name b) (< (binding:index b) nargs)))
(list "(closure variable)"))))
((late-variable-ref late-variable-set)
(and objs
(let ((v (vector-ref objs (car args))))
(if (and (variable? v) (variable-bound? v))
(list "~s" (variable-ref v))
(list "`~s'" v)))))
((mv-call)
(list "MV -> ~A" (+ end-addr (apply make-int16 (cdr args)))))
(else
(and=> (code->object code)
(lambda (obj) (list "~s" obj)))))))
;; i am format's daddy.
(define (print-info addr info extra src)
(format #t "~4@S ~32S~@[;; ~1{~@?~}~]~@[~61t at ~a~]\n" addr info extra src))
(define (simplify x)
(cond ((string? x)
(cond ((string-index x #\newline) =>
(lambda (i) (set! x (substring x 0 i)))))
(cond ((> (string-length x) 16)
(set! x (string-append (substring x 0 13) "..."))))))
x)
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