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;;; Guile VM code converters
;; Copyright (C) 2001, 2009, 2010, 2012, 2013 Free Software Foundation, Inc.
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;;
;;;; This library 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
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;;; Code:
(define-module (language assembly disassemble)
#:use-module (ice-9 format)
#:use-module (srfi srfi-1)
#:use-module (system vm instruction)
#:use-module (system vm program)
#:use-module (system base pmatch)
#:use-module (language assembly)
#:use-module (system base compile)
#:export (disassemble))
(define (disassemble x)
(format #t "Disassembly of ~A:\n\n" x)
(call-with-values
(lambda () (decompile x #:from 'value #:to 'assembly))
disassemble-load-program))
(define (disassemble-load-program asm env)
(pmatch asm
((load-program ,labels ,len ,meta . ,code)
(let ((objs (and env (assq-ref env 'objects)))
(free-vars (and env (assq-ref env 'free-vars)))
(meta (and env (assq-ref env 'meta)))
(blocs (and env (assq-ref env 'blocs)))
(srcs (and env (assq-ref env 'sources))))
(let lp ((pos 0) (code code) (programs '()))
(cond
((null? code)
(newline)
(for-each
(lambda (sym+asm)
(format #t "Embedded program ~A:\n\n" (car sym+asm))
(disassemble-load-program (cdr sym+asm) '()))
(reverse! programs)))
(else
(let* ((asm (car code))
(len (byte-length asm))
(end (+ pos len)))
(pmatch asm
((load-program . _)
(let ((sym (gensym "")))
(print-info pos `(load-program ,sym) #f #f)
(lp (+ pos (byte-length asm)) (cdr code)
(acons sym asm programs))))
((nop)
(lp (+ pos (byte-length asm)) (cdr code) programs))
(else
(print-info pos asm
;; FIXME: code-annotation for whether it's
;; an arg or not, currently passing nargs=-1
(code-annotation end asm objs -1 blocs
labels)
(and=> (and srcs (assq end srcs)) source->string))
(lp (+ pos (byte-length asm)) (cdr code) programs)))))))
(if (pair? free-vars)
(disassemble-free-vars free-vars))
(if meta
(disassemble-meta meta))
;; Disassemble other bytecode in it
;; FIXME: something about the module.
(if objs
(for-each
(lambda (x)
(if (program? x)
(begin (display "----------------------------------------\n")
(disassemble x))))
(cdr (vector->list objs))))))
(else
(error "bad load-program form" asm))))
(define (disassemble-free-vars free-vars)
(display "Free variables:\n\n")
(fold (lambda (free-var i)
(print-info i free-var #f #f)
(+ 1 i))
0
free-vars))
(define-macro (unless test . body)
`(if (not ,test) (begin ,@body)))
(define *uninteresting-props* '(name))
(define (disassemble-meta meta)
(let ((props (filter (lambda (x)
(not (memq (car x) *uninteresting-props*)))
(cdddr 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-for-user src) (source:column src)))
(define (make-int16 byte1 byte2)
(+ (* byte1 256) byte2))
(define (code-annotation end-addr code objs nargs blocs labels)
(let* ((code (assembly-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" (assq-ref labels (car args))))
((br-if-nargs-ne br-if-nargs-lt br-if-nargs-gt)
(list "-> ~A" (assq-ref labels (caddr args))))
((bind-optionals/shuffle-or-br)
(list "-> ~A" (assq-ref labels (car (last-pair args)))))
((object-ref)
(and objs (list "~s" (vector-ref objs (car args)))))
((local-ref local-boxed-ref local-set local-boxed-set)
(and blocs
(let lp ((bindings (list-ref blocs (car args))))
(and (pair? bindings)
(let ((b (car bindings)))
(if (and (< (binding:start (car bindings)) end-addr)
(>= (binding:end (car bindings)) end-addr))
(list "`~a'~@[ (arg)~]"
(binding:name b) (< (binding:index b) nargs))
(lp (cdr bindings))))))))
((assert-nargs-ee/locals assert-nargs-ge/locals)
(list "~a arg~:p, ~a local~:p"
(logand (car args) #x7) (ash (car args) -3)))
((free-ref free-boxed-ref free-boxed-set)
;; FIXME: we can do better than this
(list "(closure variable)"))
((toplevel-ref toplevel-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" (assq-ref labels (cadr args))))
((prompt)
;; the H is for handler
(list "H -> ~A" (assq-ref labels (cadr args))))
(else
(and=> (assembly->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))
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