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53befeb700
(Not quite finished, the following will be done tomorrow. module/srfi/*.scm module/rnrs/*.scm module/scripts/*.scm testsuite/*.scm guile-readline/* )
99 lines
3.5 KiB
Scheme
99 lines
3.5 KiB
Scheme
;;; Guile Lowlevel Intermediate Language
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;; Copyright (C) 2001 Free Software Foundation, Inc.
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;;;; This library is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Lesser General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 3 of the License, or (at your option) any later version.
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;;;;
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;;;; This library is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;;; Lesser General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU Lesser General Public
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;;;; License along with this library; if not, write to the Free Software
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;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;;; Code:
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(define-module (language objcode spec)
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#:use-module (system base language)
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#:use-module (system vm objcode)
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#:use-module (system vm program)
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#:export (objcode make-objcode-env))
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(define (make-objcode-env module externals)
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(cons module externals))
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(define (objcode-env-module env)
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(if env (car env) (current-module)))
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(define (objcode-env-externals env)
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(if env (cdr env) '()))
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(define (objcode->value x e opts)
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(let ((thunk (make-program x #f (objcode-env-externals e))))
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(if e
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(save-module-excursion
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(lambda ()
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(set-current-module (objcode-env-module e))
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(values (thunk) #f e)))
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(values (thunk) #f e))))
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;; since locals are allocated on the stack and can have limited scope,
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;; in many cases we use one local for more than one lexical variable. so
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;; the returned locals set is a list, where element N of the list is
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;; itself a list of bindings for local variable N.
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(define (collapse-locals locs)
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(let lp ((ret '()) (locs locs))
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(if (null? locs)
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(map cdr (sort! ret
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(lambda (x y) (< (car x) (car y)))))
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(let ((b (car locs)))
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(cond
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((assv-ref ret (binding:index b))
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=> (lambda (bindings)
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(append! bindings (list b))
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(lp ret (cdr locs))))
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(else
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(lp (acons (binding:index b) (list b) ret)
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(cdr locs))))))))
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(define (decompile-value x env opts)
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(cond
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((program? x)
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(let ((objs (program-objects x))
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(meta (program-meta x))
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(exts (program-external x))
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(binds (program-bindings x))
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(srcs (program-sources x))
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(nargs (arity:nargs (program-arity x))))
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(let ((blocs (and binds
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(collapse-locals
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(append (list-head binds nargs)
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(filter (lambda (x) (not (binding:extp x)))
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(list-tail binds nargs))))))
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(bexts (and binds
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(filter binding:extp binds))))
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(values (program-objcode x)
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`((objects . ,objs)
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(meta . ,(and meta (meta)))
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(exts . ,exts)
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(blocs . ,blocs)
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(bexts . ,bexts)
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(sources . ,srcs))))))
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((objcode? x)
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(values x #f))
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(else
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(error "can't decompile ~A: not a program or objcode" x))))
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(define-language objcode
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#:title "Guile Object Code"
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#:version "0.3"
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#:reader #f
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#:printer write-objcode
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#:compilers `((value . ,objcode->value))
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#:decompilers `((value . ,decompile-value))
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)
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