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;;; CMPVS Value stack manager.
;;;
;; Copyright (C) 1994 M. Hagiya, W. Schelter, T. Yuasa
;; This file is part of GNU Common Lisp, herein referred to as GCL
;;
;; GCL is free software; you can redistribute it and/or modify it under
;; the terms of the GNU LIBRARY GENERAL PUBLIC LICENSE as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;;
;; GCL 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 Library General Public
;; License for more details.
;;
;; You should have received a copy of the GNU Library General Public License
;; along with GCL; see the file COPYING. If not, write to the Free Software
;; Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
(in-package 'compiler)
(si:putprop 'vs 'set-vs 'set-loc)
(si:putprop 'vs 'wt-vs 'wt-loc)
(si:putprop 'vs* 'wt-vs* 'wt-loc)
(si:putprop 'ccb-vs 'wt-ccb-vs 'wt-loc)
(defvar *vs* 0)
(defvar *max-vs* 0)
(defvar *clink* nil)
(defvar *ccb-vs* 0)
;; We need an initial binding for *initial-ccb-vs* for use in defining
;; local functions at the toplevel in c2flet and c2labels. CM
;; 20031130.
(defvar *initial-ccb-vs* 0)
(defvar *level* 0)
(defvar *vcs-used*)
;;; *vs* holds the offset of the current vs-top.
;;; *max-vs* holds the maximum offset so far.
;;; *clink* holds NIL or the vs-address of the last ccb object.
;;; *ccb-vs* holds the top of the level 0 vs.
;;; *initial-ccb-vs* holds the value of *ccb-vs* when Pass 2 began to process
;;; a local (possibly closure) function.
;;; *level* holds the current function level. *level* is 0 for a top-level
;;; function.
(defun vs-push ()
(prog1 (cons *level* *vs*)
(incf *vs*)
(setq *max-vs* (max *vs* *max-vs*))))
(defun set-vs (loc vs)
(unless (and (consp loc)
(eq (car loc) 'vs)
(equal (cadr loc) vs))
(wt-nl)
(wt-vs vs)
(wt "= " loc ";")))
(defun wt-vs (vs)
(cond ((eq (car vs) 'cvar)
(wt "V" (second vs)))
((eq (car vs) 'cs)
(setq *vcs-used* t)
(wt "Vcs[" (cdr vs) "]"))
(t
(if (= (car vs) *level*)
(wt "base[" (cdr vs) "]")
(wt "base" (car vs) "[" (cdr vs) "]")))))
(defun wt-vs* (vs)
(wt "(" )(wt-vs vs) (wt "->c.c_car)"))
(defun wt-ccb-vs (ccb-vs)
(wt "(base0[" (- *initial-ccb-vs* ccb-vs) "]->c.c_car)"))
(defun clink (vs) (setq *clink* vs))
(defun wt-clink (&optional (clink *clink*))
(if (null clink) (wt "Cnil") (wt-vs clink)))
(defun ccb-vs-push () (incf *ccb-vs*))
(defun cvs-push ()
(prog1 (cons 'cs *cs*)
(incf *cs*)
))
(defun wt-list (l)
(do ((v l (cdr v)))
((null v))
(wt (car v))
(or (null (cdr v)) (wt ","))))
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