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- ;;; CMPCATCH Catch, Unwind-protect, and Throw.
- ;;;
- ;; (c) Copyright Taiichi Yuasa and Masami Hagiya, 1984. All rights reserved.
- ;; Copying of this file is authorized to users who have executed the true and
- ;; proper "License Agreement for Kyoto Common LISP" with SIGLISP.
-
- (in-package 'compiler)
-
- (si:putprop 'catch 'c1catch 'c1special)
- (si:putprop 'catch 'c2catch 'c2)
- (si:putprop 'unwind-protect 'c1unwind-protect 'c1special)
- (si:putprop 'unwind-protect 'c2unwind-protect 'c2)
- (si:putprop 'throw 'c1throw 'c1special)
- (si:putprop 'throw 'c2throw 'c2)
-
- (defun c1catch (args &aux (info (make-info :sp-change t)) tag)
- (when (endp args) (too-few-args 'catch 1 0))
- (setq tag (c1expr (car args)))
- (add-info info (cadr tag))
- (setq args (c1progn (cdr args)))
- (add-info info (cadr args))
- (list 'catch info tag args))
-
- (si:putprop 'push-catch-frame 'set-push-catch-frame 'set-loc)
-
- (defun c2catch (tag body &aux (*vs* *vs*))
- (let ((*value-to-go* '(push-catch-frame))) (c2expr* tag))
- (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 "}")
- )
-
- (defun set-push-catch-frame (loc)
- (wt-nl "frs_push(FRS_CATCH," loc ");"))
-
- (defun c1unwind-protect (args &aux (info (make-info :sp-change t)) form)
- (when (endp args) (too-few-args 'unwind-protect 1 0))
- (setq form (let ((*blocks* (cons 'lb *blocks*))
- (*tags* (cons 'lb *tags*))
- (*vars* (cons 'lb *vars*)))
- (c1expr (car args))))
- (add-info info (cadr form))
- (setq args (c1progn (cdr args)))
- (add-info info (cadr args))
- (list 'unwind-protect info form args)
- )
-
- (defun c2unwind-protect (form body
- &aux (*vs* *vs*) (loc (list 'vs (vs-push))))
- (wt-nl "{object tag;frame_ptr fr;object p;bool active;")
- (wt-nl "frs_push(FRS_PROTECT,Cnil);")
- (wt-nl "if(nlj_active){tag=nlj_tag;fr=nlj_fr;active=TRUE;}")
- (wt-nl "else{")
- (let ((*value-to-go* 'top)) (c2expr* form))
- (wt-nl "active=FALSE;}")
- (wt-nl loc "=Cnil;")
- (wt-nl "while(vs_base<vs_top)")
- (wt-nl "{" loc "=MMcons(vs_top[-1]," loc ");vs_top--;}")
- (wt-nl) (reset-top)
- (wt-nl "nlj_active=FALSE;frs_pop();")
- (let ((*value-to-go* 'trash)) (c2expr* body))
- (wt-nl "vs_base=vs_top=base+" *vs* ";")
- (base-used)
- (wt-nl "for(p= " loc ";!endp(p);p=MMcdr(p))vs_push(MMcar(p));")
- (wt-nl "if(active)unwind(fr,tag);else{")
- (unwind-exit 'fun-val)
- (wt "}}")
- )
-
- (defun c1throw (args &aux (info (make-info)) tag)
- (when (or (endp args) (endp (cdr args)))
- (too-few-args 'throw 2 (length args)))
- (unless (endp (cddr args))
- (too-many-args 'throw 2 (length args)))
- (setq tag (c1expr (car args)))
- (add-info info (cadr tag))
- (setq args (c1expr (cadr args)))
- (add-info info (cadr args))
- (list 'throw info tag args)
- )
-
- (defun c2throw (tag val &aux (*vs* *vs*) loc)
- (wt-nl "{frame_ptr fr;")
- (case (car tag)
- (LOCATION (setq loc (caddr tag)))
- (VAR (let ((var (caaddr tag)))
- (declare (object var))
- (case (var-kind var)
- (LEXICAL (setq loc (list 'vs (var-ref var))))
- (REPLACED (setq loc (var-loc var)))
- (t (setq loc (list 'vs (vs-push)))
- (wt-nl loc "= ") (wt-var var nil) (wt ";")))))
- (t (setq loc (list 'vs (vs-push)))
- (let ((*value-to-go* loc)) (c2expr* tag))))
-
- (wt-nl "fr=frs_sch_catch(" loc ");")
- (wt-nl "if(fr==NULL) FEerror(\"The tag ~s is undefined.\",1," loc ");")
- (let ((*value-to-go* 'top)) (c2expr* val))
- (wt-nl "unwind(fr," loc ");}")
- )
-
-
-