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-rw-r--r--module/language/objcode/spec.scm84
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-;;; Guile Lowlevel Intermediate Language
-
-;; Copyright (C) 2001, 2009, 2010, 2011, 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 objcode spec)
- #:use-module (system base language)
- #:use-module (system vm objcode)
- #:use-module (system vm program)
- #:use-module (language objcode elf)
- #:export (objcode))
-
-(define (objcode->value x e opts)
- (let ((thunk (make-program x #f #f)))
- (if (eq? e (current-module))
- ;; save a cons in this case
- (values (thunk) e e)
- (save-module-excursion
- (lambda ()
- (set-current-module e)
- (values (thunk) e 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)))
- (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 "Object for disassembly not a program or objcode" x))))
-
-(define-language objcode
- #:title "Guile Object Code"
- #:reader #f
- #:printer write-objcode
- #:compilers `((value . ,objcode->value))
- #:decompilers `((value . ,decompile-value))
- #:for-humans? #f
- )