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;;; CMPMULT Multiple-value-call and Multiple-value-prog1.
;;;
;; 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 'multiple-value-call 'c1multiple-value-call 'c1special)
(si:putprop 'multiple-value-call 'c2multiple-value-call 'c2)
(si:putprop 'multiple-value-prog1 'c1multiple-value-prog1 'c1special)
(si:putprop 'multiple-value-prog1 'c2multiple-value-prog1 'c2)
(si:putprop 'values 'c1values 'c1)
(si:putprop 'values 'c2values 'c2)
(si:putprop 'multiple-value-setq 'c1multiple-value-setq 'c1)
(si:putprop 'multiple-value-setq 'c2multiple-value-setq 'c2)
(si:putprop 'multiple-value-bind 'c1multiple-value-bind 'c1)
(si:putprop 'multiple-value-bind 'c2multiple-value-bind 'c2)
(defun c1multiple-value-call (args &aux info funob)
(when (endp args) (too-few-args 'multiple-value-call 1 0))
(cond ((endp (cdr args)) (c1funcall args))
(t (setq funob (c1funob (car args)))
(setq info (copy-info (cadr funob)))
(setq args (c1args (cdr args) info))
(list 'multiple-value-call info funob args)))
)
(defun c2multiple-value-call (funob forms &aux (*vs* *vs*) loc top sup)
(cond ((endp (cdr forms))
(setq loc (save-funob funob))
(let ((*value-to-go* 'top)) (c2expr* (car forms)))
(c2funcall funob 'args-pushed loc))
(t
(setq top (next-cvar))
(setq sup (next-cvar))
(setq loc (save-funob funob))
(base-used)
;; Add (sup .var) handling in unwind-exit -- in
;; c2multiple-value-prog1 and c2-multiple-value-call, apparently
;; alone, c2expr-top is used to evaluate arguments, presumably to
;; preserve certain states of the value stack for the purposes of
;; retrieving the final results. c2exprt-top rebinds sup, and
;; vs_top in turn to the new sup, causing non-local exits to lose
;; the true top of the stack vital for subsequent function
;; evaluations. We unwind this stack supremum variable change here
;; when necessary. CM 20040301
(wt-nl "{object *V" top "=base+" *vs* ",*V" sup "=sup;")
(dolist** (form forms)
(let ((*value-to-go* 'top)
(*unwind-exit* (cons (cons 'sup sup) *unwind-exit*)))
(c2expr-top* form top))
(wt-nl "while(vs_base<vs_top)")
(wt-nl "{V" top "[0]=vs_base[0];V" top "++;vs_base++;}"))
(wt-nl "vs_base=base+" *vs* ";vs_top=V" top ";sup=V" sup ";")
(c2funcall funob 'args-pushed loc)
(wt "}")))
)
(defun c1multiple-value-prog1 (args &aux (info (make-info)) form)
(when (endp args) (too-few-args 'multiple-value-prog1 1 0))
(setq form (c1expr* (car args) info))
(setq args (c1args (cdr args) info))
(list 'multiple-value-prog1 info form args)
)
;; We may record information here when *value-to-go* = 'top
(defvar *top-data* nil)
(defun c2multiple-value-prog1 (form forms &aux (base (next-cvar))
(top (next-cvar))
(sup (next-cvar))
top-data)
(let ((*value-to-go* 'top)
*top-data* )
(c2expr* form)
(setq top-data *top-data*))
;; Add (sup .var) handling in unwind-exit -- in
;; c2multiple-value-prog1 and c2-multiple-value-call, apparently
;; alone, c2expr-top is used to evaluate arguments, presumably to
;; preserve certain states of the value stack for the purposes of
;; retrieving the final results. c2exprt-top rebinds sup, and
;; vs_top in turn to the new sup, causing non-local exits to lose
;; the true top of the stack vital for subsequent function
;; evaluations. We unwind this stack supremum variable change here
;; when necessary. CM 20040301
(wt-nl "{object *V" top "=vs_top,*V" base "=vs_base,*V" sup "=sup;")
(wt-nl "vs_base=V" top ";")
(dolist** (form forms)
(let ((*value-to-go* 'trash)
(*unwind-exit* (cons (cons 'sup sup) *unwind-exit*)))
(c2expr-top* form top)))
(wt-nl "vs_base=V" base ";vs_top=V" top ";sup=V" sup ";}")
(unwind-exit 'fun-val nil (if top-data (car top-data)))
)
(defun c1values (args &aux (info (make-info))(s (si::sgen "VALUES")))
(cond ((and args (not (cdr args)))
(c1expr `(let ((,s ,(car args))) ,s)))
(t (setq args (c1args args info))
(list 'values info args))))
(defun c2values (forms &aux (base *vs*) (*vs* *vs*))
(cond ((and (eq *value-to-go* 'return-object)
(cdr forms)
(consp *current-form*)
(eq 'defun (car *current-form*)))
(cmpwarn "Trying to return multiple values. ~%;But ~a was proclaimed to have single value.~%;Only first one will assured."
(cadr *current-form*))))
(cond ((null forms)
(wt-nl "vs_base=vs_top=base+" base ";")
(base-used)
(wt-nl "vs_base[0]=Cnil;"))
(t
(dolist** (form forms)
(let ((*value-to-go* (list 'vs (vs-push)))) (c2expr* form)))
(wt-nl "vs_top=(vs_base=base+" base ")+" (- *vs* base) ";")
(base-used)))
(unwind-exit 'fun-val nil (cons 'values (length forms))))
(defun c1multiple-value-setq (args &aux (info (make-info)) (vrefs nil))
(when (or (endp args) (endp (cdr args)))
(too-few-args 'multiple-value-setq 2 0))
(unless (endp (cddr args))
(too-many-args 'multiple-value-setq 2 (length args)))
(dolist (var (car args))
(cmpck (not (symbolp var)) "The variable ~s is not a symbol." var)
(cmpck (constantp var)
"The constant ~s is being assigned a value." var)
(setq var (c1vref var))
(push var vrefs)
(push-changed (car var) info)
)
(list 'multiple-value-setq info (nreverse vrefs) (c1expr* (cadr args) info))
)
(defun multiple-value-check (vrefs form)
(and (cdr vrefs)
(eq (car form) 'call-global)
(let ((fname (third form)))
(cond ((and (symbolp fname)
(let ((tem (get fname 'proclaimed-return-type)))
(and tem
;; proclaimed to have 1 arg:
(consp tem)
(not (equal tem '(*)))
(null (cdr tem)))))
(cmpwarn "~A was proclaimed to have only one return value. ~%;But you appear to want multiple values." fname))))))
(defun c2multiple-value-setq (vrefs form &aux top-data)
(multiple-value-check vrefs form)
(let ((*value-to-go* 'top)*top-data*)
(c2expr* form) (setq top-data *top-data*))
(and *record-call-info* (record-call-info nil (car top-data)))
(wt-nl "if(vs_base>vs_top) vs_top=vs_base;")
(wt-nl "*vs_top=Cnil;")
(do ((vs vrefs (cdr vs)))
((endp vs))
(let ((vref (car vs)))
(set-var 'fun-val (car vref) (cadr vref))
(unless (endp (cdr vs)) (wt-nl "if(vs_base<vs_top) vs_base++;"))))
(cond ((null vrefs)
(wt-nl "if(vs_base==vs_top){vs_base[0]=Cnil;}")
(wt-nl "vs_top=vs_base+1;}")
(unwind-exit 'fun-val))
(t (unless (eq *exit* 'return) (wt-nl) (reset-top))
(unwind-exit (cons 'var (car vrefs))))))
(defun c1multiple-value-bind (args &aux (info (make-info))
(vars nil) (vnames nil) init-form
ss is ts body other-decls
(*vars* *vars*))
(when (or (endp args) (endp (cdr args)))
(too-few-args 'multiple-value-bind 2 (length args)))
(multiple-value-setq (body ss ts is other-decls) (c1body (cddr args) nil))
(c1add-globals ss)
(dolist** (s (car args))
(let ((v (c1make-var s ss is ts)))
(push s vnames)
(push v vars)))
(setq init-form (c1expr* (cadr args) info))
(setq *vars* (append vars *vars*))
; (dolist* (v (reverse vars)) (push v *vars*))
(check-vdecl vnames ts is)
(setq body (c1decl-body other-decls body))
(add-info info (cadr body))
(setf (info-type info) (info-type (cadr body)))
(dolist** (var vars) (check-vref var))
(list 'multiple-value-bind info (nreverse vars) init-form body)
)
(defun c2multiple-value-bind (vars init-form body
&aux (block-p nil)
(*unwind-exit* *unwind-exit*)
(*vs* *vs*) (*clink* *clink*) (*ccb-vs* *ccb-vs*)
top-data)
(multiple-value-check vars init-form)
(dolist (var vars)
(let ((kind (c2var-kind var)))
(if kind
(let ((cvar (next-cvar)))
(setf (var-kind var) kind)
(setf (var-loc var) cvar)
(wt-nl)
(unless block-p (wt "{") (setq block-p t))
(wt-var-decl var))
(setf (var-ref var) (vs-push)))))
(let ((*value-to-go* 'top) *top-data*)
(c2expr* init-form) (setq top-data *top-data*))
(and *record-call-info* (record-call-info nil (car top-data)))
(wt-nl "if(vs_base>vs_top) vs_top=vs_base;")
(wt-nl "*vs_top=Cnil;")
(do ((vs vars (cdr vs)))
((endp vs))
(c2bind-loc (car vs) '(vs-base 0))
(unless (endp (cdr vs)) (wt-nl "if (vs_base<vs_top) vs_base++;")))
(wt-nl) (reset-top)
(c2expr body)
(when block-p (wt "}")))
|
