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;;; Guile Lowlevel Intermediate Language
;; Copyright (C) 2001, 2009 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 objcode spec)
#:use-module (system base language)
#:use-module (system vm objcode)
#:use-module (system vm program)
#:export (objcode make-objcode-env))
(define (make-objcode-env module externals)
(cons module externals))
(define (objcode-env-module env)
(if env (car env) (current-module)))
(define (objcode-env-externals env)
(and env (vector? (cdr env)) (cdr env)))
(define (objcode->value x e opts)
(let ((thunk (make-program x #f (objcode-env-externals e))))
(if e
(save-module-excursion
(lambda ()
(set-current-module (objcode-env-module e))
(values (thunk) #f e)))
(values (thunk) #f e))))
;; since locals are allocated on the stack and can have limited scope,
;; in many cases we use one local for more than one lexical variable. so
;; the returned locals set is a list, where element N of the list is
;; itself a list of bindings for local variable N.
(define (collapse-locals locs)
(let lp ((ret '()) (locs locs))
(if (null? locs)
(map cdr (sort! ret
(lambda (x y) (< (car x) (car y)))))
(let ((b (car locs)))
(cond
((assv-ref ret (binding:index b))
=> (lambda (bindings)
(append! bindings (list b))
(lp ret (cdr locs))))
(else
(lp (acons (binding:index b) (list b) ret)
(cdr locs))))))))
(define (decompile-value x env opts)
(cond
((program? x)
(let ((objs (program-objects x))
(meta (program-meta x))
(free-vars (program-free-variables x))
(binds (program-bindings x))
(srcs (program-sources x))
(nargs (arity:nargs (program-arity x))))
(let ((blocs (and binds (collapse-locals binds))))
(values (program-objcode x)
`((objects . ,objs)
(meta . ,(and meta (meta)))
(free-vars . ,free-vars)
(blocs . ,blocs)
(sources . ,srcs))))))
((objcode? x)
(values x #f))
(else
(error "can't decompile ~A: not a program or objcode" x))))
(define-language objcode
#:title "Guile Object Code"
#:version "0.3"
#:reader #f
#:printer write-objcode
#:compilers `((value . ,objcode->value))
#:decompilers `((value . ,decompile-value))
)
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