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;;; CMPBLOCK Block and Return-from.
;;;
;; 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 'block 'c1block 'c1special)
(si:putprop 'block 'c2block 'c2)
(si:putprop 'return-from 'c1return-from 'c1special)
(si:putprop 'return-from 'c2return-from 'c2)
(defstruct blk
name ;;; Block name.
ref ;;; Referenced or not. T or NIL.
ref-clb ;;; Cross local function reference.
;;; During Pass1, T or NIL.
;;; During Pass2, the vs-address for the
;;; block id, or NIL.
ref-ccb ;;; Cross closure reference.
;;; During Pass1, T or NIL.
;;; During Pass2, the ccb-vs for the
;;; block id, or NIL.
exit ;;; Where to return. A label.
value-to-go ;;; Where the value of the block to go.
var ;;; The block name holder. Used only in
;;; the error message.
)
(defvar *blocks* nil)
;;; During Pass 1, *blocks* holds a list of blk objects and the symbols 'CB'
;;; (Closure Boundary) and 'LB' (Level Boundary). 'CB' will be pushed on
;;; *blocks* when the compiler begins to process a closure. 'LB' will be
;;; pushed on *blocks* when *level* is incremented.
(defun c1block (args)
(when (endp args) (too-few-args 'block 1 0))
(cmpck (not (symbolp (car args)))
"The block name ~s is not a symbol." (car args))
(let* ((blk (make-blk :name (car args) :ref nil :ref-ccb nil :ref-clb nil))
(*blocks* (cons blk *blocks*))
(body (c1progn (cdr args))))
(if (or (blk-ref-ccb blk) (blk-ref-clb blk))
(incf *setjmps*))
(if (or (blk-ref-ccb blk) (blk-ref-clb blk) (blk-ref blk))
(list 'block (reset-info-type (cadr body)) blk body)
body))
)
(defun c2block (blk body)
(cond ((blk-ref-ccb blk) (c2block-ccb blk body))
((blk-ref-clb blk) (c2block-clb blk body))
(t (c2block-local blk body))))
(defun c2block-local (blk body)
(setf (blk-exit blk) *exit*)
(setf (blk-value-to-go blk) *value-to-go*)
(c2expr body)
)
(defun c2block-clb (blk body &aux (*vs* *vs*))
(setf (blk-exit blk) *exit*)
(setf (blk-value-to-go blk) *value-to-go*)
(setf (blk-ref-clb blk) (vs-push))
(wt-nl)
(wt-vs (blk-ref-clb blk))
(wt "=alloc_frame_id();")
(wt-nl "frs_push(FRS_CATCH,") (wt-vs (blk-ref-clb blk)) (wt ");")
(wt-nl "if(nlj_active)")
(wt-nl "{nlj_active=FALSE;frs_pop();")
(unwind-exit 'fun-val 'jump)
(wt "}")
(wt-nl "else{")
(let ((*unwind-exit* (cons 'frame *unwind-exit*))) (c2expr body))
(wt-nl "}")
)
(defun c2block-ccb (blk body &aux (*vs* *vs*) (*clink* *clink*)
(*ccb-vs* *ccb-vs*))
(setf (blk-exit blk) *exit*)
(setf (blk-value-to-go blk) *value-to-go*)
(setf (blk-ref-clb blk) (vs-push))
(setf (blk-var blk) (add-symbol (blk-name blk)))
(wt-nl) (wt-vs (blk-ref-clb blk)) (wt "=alloc_frame_id();")
(wt-nl) (wt-vs (blk-ref-clb blk))
(wt "=MMcons(") (wt-vs (blk-ref-clb blk)) (wt ",") (wt-clink) (wt ");")
(clink (blk-ref-clb blk))
(setf (blk-ref-ccb blk) (ccb-vs-push))
(wt-nl "frs_push(FRS_CATCH,") (wt-vs* (blk-ref-clb blk)) (wt ");")
(wt-nl "if(nlj_active)")
(wt-nl "{nlj_active=FALSE;frs_pop();")
(unwind-exit 'fun-val 'jump)
(wt "}")
(wt-nl "else{")
(let ((*unwind-exit* (cons 'frame *unwind-exit*))) (c2expr body))
(wt-nl "}")
)
(defun c1return-from (args)
(cond ((endp args) (too-few-args 'return-from 1 0))
((and (not (endp (cdr args))) (not (endp (cddr args))))
(too-many-args 'return-from 2 (length args)))
((not (symbolp (car args)))
"The block name ~s is not a symbol." (car args)))
(do ((blks *blocks* (cdr blks))
(name (car args))
(ccb nil) (clb nil))
((endp blks)
(cmperr "The block ~s is undefined." name))
(declare (object name ccb clb))
(case (car blks)
(cb (setq ccb t))
(lb (setq clb t))
(t (when (eq (blk-name (car blks)) name)
(let ((val (c1expr (cadr args)))
(blk (car blks)))
(cond
(ccb (setf (blk-ref-ccb blk) t))
(clb (setf (blk-ref-clb blk) t))
(t (setf (blk-ref blk) t)))
(return (list 'return-from
(reset-info-type (cadr val))
blk clb ccb val)))))))
)
(defun c2return-from (blk clb ccb val)
(cond (ccb (c2return-ccb blk val))
(clb (c2return-clb blk val))
(t (c2return-local blk val))))
(defun c2return-local (blk val)
(let ((*value-to-go* (blk-value-to-go blk))
(*exit* (blk-exit blk)))
(c2expr val))
)
(defun c2return-clb (blk val)
(let ((*value-to-go* 'top)) (c2expr* val))
(wt-nl "unwind(frs_sch(")
(if (blk-ref-ccb blk) (wt-vs* (blk-ref-clb blk)) (wt-vs (blk-ref-clb blk)))
(wt "),Cnil);")
)
(defun c2return-ccb (blk val)
(wt-nl "{frame_ptr fr;")
(wt-nl "fr=frs_sch(") (wt-ccb-vs (blk-ref-ccb blk)) (wt ");")
(wt-nl "if(fr==NULL) FEerror(\"The block ~s is missing.\",1," (vv-str (blk-var blk)) ");")
(let ((*value-to-go* 'top)) (c2expr* val))
(wt-nl "unwind(fr,Cnil);}")
)
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