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Overview
Comment:Exception handlers and dynamic exit traps for CHICKEN callback trampolines
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SHA1:59297e2f3f400f7d0bb3520c1df2aceb93791723
User & Date: murphy 2015-08-05 16:05:08
Context
2015-08-06
15:17
Improved return value marshalling in CHICKEN callback wrapper check-in: ab22068543 user: murphy tags: trunk
2015-08-05
16:05
Exception handlers and dynamic exit traps for CHICKEN callback trampolines check-in: 59297e2f3f user: murphy tags: trunk
15:23
Somewhat more consistent names: background-box -> backgroundbox, detach-box -> detachbox, expander -> expandbox, scroll-box -> scrollbox check-in: a04b3fd0a4 user: murphy tags: trunk
Changes
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Changes to chicken/iup-base.scm. 

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	(define frame-return/double!
		(foreign-lambda* void ([c-pointer frame] [double ret]) "va_return_double((va_alist)frame, ret);"))
	(define frame-return/pointer!
		(foreign-lambda* void ([c-pointer frame] [c-pointer ret]) "va_return_ptr((va_alist)frame, void *, ret);"))
	(define frame-return/handle!
		(foreign-lambda* void ([c-pointer frame] [ihandle ret]) "va_return_ptr((va_alist)frame, Ihandle *, ret);"))
	






	(let* ([data (registry-ref (pointer->address cid))]
				 [sig (car data)]
				 [proc (cdr data)])

		(case (string-ref sig 0)
			[(#\b)     (frame-start/ubyte! frame)]
			[(#\i)     (frame-start/int! frame)]
			[(#\f)     (frame-start/float! frame)]
			[(#\d)     (frame-start/double! frame)]
			[(#\v #\h) (frame-start/pointer! frame)])
		(let* ([args (list-ec (:string chr "h" (string-drop sig 1))
					         (case chr
					         	 [(#\b) (frame-arg/ubyte! frame)]
					         	 [(#\i) (frame-arg/int! frame)]
					         	 [(#\f) (frame-arg/float! frame)]
					         	 [(#\d) (frame-arg/double! frame)]
					         	 [(#\s) (frame-arg/string! frame)]
					         	 [(#\v) (frame-arg/pointer! frame)]
					         	 [(#\h) (frame-arg/handle! frame)]))]


				   [ret (apply proc args)])



			(case (string-ref sig 0)
				[(#\b) (frame-return/ubyte! frame ret)]
				[(#\i) (frame-return/status! frame ret)]
				[(#\f) (frame-return/float! frame ret)]
				[(#\d) (frame-return/double! frame ret)]
				[(#\v) (frame-return/pointer! frame ret)]
				[(#\h) (frame-return/handle! frame ret)]))))


(define-values (callback-set! callback)
	(letrec ([signature/raw
						(foreign-lambda* c-string ([nonnull-ihandle handle] [iname/upcase name])
							"C_return(iupClassCallbackGetFormat(handle->iclass, name));")]
					 [set/pointer!
					  (foreign-lambda c-pointer "IupSetCallback" nonnull-ihandle iname/upcase c-pointer)]








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	(define frame-return/double!
		(foreign-lambda* void ([c-pointer frame] [double ret]) "va_return_double((va_alist)frame, ret);"))
	(define frame-return/pointer!
		(foreign-lambda* void ([c-pointer frame] [c-pointer ret]) "va_return_ptr((va_alist)frame, void *, ret);"))
	(define frame-return/handle!
		(foreign-lambda* void ([c-pointer frame] [ihandle ret]) "va_return_ptr((va_alist)frame, Ihandle *, ret);"))
	
	(call-with-current-continuation
	 (lambda (return)
		 (let ([sig "i"] [ret 'continue])
			 (dynamic-wind
				 void
				 (lambda ()
					 (let* ([data (registry-ref (pointer->address cid))]

									[proc (cdr data)])
						 (set! sig (car data))
						 (case (string-ref sig 0)
							 [(#\b)     (frame-start/ubyte! frame)]
							 [(#\i)     (frame-start/int! frame)]
							 [(#\f)     (frame-start/float! frame)]
							 [(#\d)     (frame-start/double! frame)]
							 [(#\v #\h) (frame-start/pointer! frame)])
						 (let ([args (list-ec (:string chr "h" (string-drop sig 1))
													 (case chr
														 [(#\b) (frame-arg/ubyte! frame)]
														 [(#\i) (frame-arg/int! frame)]
														 [(#\f) (frame-arg/float! frame)]
														 [(#\d) (frame-arg/double! frame)]
														 [(#\s) (frame-arg/string! frame)]
														 [(#\v) (frame-arg/pointer! frame)]
														 [(#\h) (frame-arg/handle! frame)]))])
							 (handle-exceptions exn
								 (print-error-message exn (current-error-port) "Error: in callback")
								 (set! ret (apply proc args))))))
				 (lambda ()
					 (handle-exceptions exn
						 (void)
						 (case (string-ref sig 0)
							 [(#\b) (frame-return/ubyte! frame ret)]
							 [(#\i) (frame-return/status! frame ret)]
							 [(#\f) (frame-return/float! frame ret)]
							 [(#\d) (frame-return/double! frame ret)]
							 [(#\v) (frame-return/pointer! frame ret)]
							 [(#\h) (frame-return/handle! frame ret)]))
					 (return (void))))))))

(define-values (callback-set! callback)
	(letrec ([signature/raw
						(foreign-lambda* c-string ([nonnull-ihandle handle] [iname/upcase name])
							"C_return(iupClassCallbackGetFormat(handle->iclass, name));")]
					 [set/pointer!
					  (foreign-lambda c-pointer "IupSetCallback" nonnull-ihandle iname/upcase c-pointer)]

Changes to chicken/iup-config.scm. 

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	(foreign-safe-lambda void "IupConfigDialogClosed" nonnull-ihandle nonnull-ihandle nonnull-c-string))

;; }}}

;; {{{ Configured Recent Files

(define-external (recent_action_entry [ihandle handle]) istatus
	(let ([action (cond [(and handle (parent handle)) => (cut callback <> 'action)])])
		(if action








				(action handle)
				'continue)))



(define config-recent-menu
	(make-constructor-procedure
	  (lambda (handle max-recent)
			(let ([menu (foreign-value "IupMenu(NULL)" nonnull-ihandle)])
				((foreign-lambda* void ([nonnull-ihandle handle] [nonnull-ihandle menu] [int max_recent])
					 "IupConfigRecentInit(handle, menu, recent_action_entry, max_recent);")








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	(foreign-safe-lambda void "IupConfigDialogClosed" nonnull-ihandle nonnull-ihandle nonnull-c-string))

;; }}}

;; {{{ Configured Recent Files

(define-external (recent_action_entry [ihandle handle]) istatus
	(call-with-current-continuation
	 (lambda (return)
		 (let ([r 'continue])
			 (dynamic-wind
				 void
				 (lambda ()
					 (and-let* ([group (and handle (parent handle))]
											[action (callback group 'action)])
						 (handle-exceptions exn
							 (print-error-message exn (current-error-port) "Error: in recent action callback")
							 (set! r (action handle)))))

				 (lambda ()
					 (return r)))))))

(define config-recent-menu
	(make-constructor-procedure
	  (lambda (handle max-recent)
			(let ([menu (foreign-value "IupMenu(NULL)" nonnull-ihandle)])
				((foreign-lambda* void ([nonnull-ihandle handle] [nonnull-ihandle menu] [int max_recent])
					 "IupConfigRecentInit(handle, menu, recent_action_entry, max_recent);")

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