;;; -*-  Mode: Lisp; Package: Maxima; Syntax: Common-Lisp; Base: 10 -*- ;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;     The data in this file contains enhancments.                    ;;;;;
;;;                                                                    ;;;;;
;;;  Copyright (c) 1984,1987 by William Schelter,University of Texas   ;;;;;
;;;     All rights reserved                                            ;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;                Macros for TRANSL source compilation.                 ;;;
;;;       (c) Copyright 1980 Massachusetts Institute of Technology       ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(in-package "MAXIMA")
(macsyma-module transm macro)
(load-macsyma-macros procs)
(load-macsyma-macros-at-runtime 'procs)

(DEFVAR TRANSL-MODULES NIL)

;;; Simple but effective single-level module definitions
;;; and utilities which work through property lists.
;;; Information has to be in various places:
;;; [1] Compile-time of the TRANSLATOR itself.
;;; [2] Runtime of the translator.
;;; [3] Translate-time of user-code
;;; [4] Compile-time of user-code.
;;; [5] Runtime of user-code.
;;; [6] "Utilities" or documentation-time of user-code.

;;; -GJC 

;;; Note: Much of the functionality here was in use before macsyma as
;;; a whole got such mechanisms, however we must admit that the macsyma
;;; user-level (and non-modular global only) INFOLISTS of FUNCTIONS and VALUES,
;;; inspired this, motivated by my characteristic lazyness.

(DEFMACRO ENTERQ (THING LIST)
  ;; should be a DEF-ALTERANT
  `(OR (MEMQ ,THING ,LIST)
       (SETF ,LIST (CONS ,THING ,LIST))))

(DEFMACRO DEF-TRANSL-MODULE (NAME &REST PROPERTIES)
  `(PROGN
    (ENTerQ ',NAME TRANSL-MODULES)
    ,@(MAPCAR #'(LAMBDA (P)
		  `(DEFPROP ,NAME
		     ,(IF (ATOM P) T (CDR P))
		     ,(IF (ATOM P) P (CAR P))))
	      PROPERTIES)))

(DEF-TRANSL-MODULE TRANSS TTIME-AUTO)
(DEF-TRANSL-MODULE TRANSL TTIME-AUTO (FIRST-LOAD TRDATA DCL))
(DEF-TRANSL-MODULE TRUTIL TTIME-AUTO)
(DEF-TRANSL-MODULE TRANS1 TTIME-AUTO)
(DEF-TRANSL-MODULE TRANS2 TTIME-AUTO)
(DEF-TRANSL-MODULE TRANS3 TTIME-AUTO)
(DEF-TRANSL-MODULE TRANS4 TTIME-AUTO)
(DEF-TRANSL-MODULE TRANS5 TTIME-AUTO)
(DEF-TRANSL-MODULE TRANSF TTIME-AUTO)
(DEF-TRANSL-MODULE TROPER TTIME-AUTO)
(DEF-TRANSL-MODULE TRPRED TTIME-AUTO)

(DEF-TRANSL-MODULE MTAGS TTIME-AUTO)
(DEF-TRANSL-MODULE MDEFUN)
(DEF-TRANSL-MODULE TRANSQ)
(DEF-TRANSL-MODULE FCALL  NO-LOAD-AUTO)
(DEF-TRANSL-MODULE ACALL NO-LOAD-AUTO)
(DEF-TRANSL-MODULE TRDATA   NO-LOAD-AUTO)
(DEF-TRANSL-MODULE MCOMPI TTIME-AUTO)

(DEF-TRANSL-MODULE DCL pseudo) ; more data
(DEFPROP DCL MAXDOC FASL-DIR)

(DEF-TRANSL-MODULE TRMODE TTIME-AUTO
  NO-LOAD-AUTO
  ;; Temporary hack, TRANSL AUTOLOADs should be
  ;; in a different file from functional autoloads.
  )

(DEF-TRANSL-MODULE TRHOOK HYPER)
(DEF-TRANSL-MODULE TRANSL-AUTOLOAD PSEUDO)

(eval-when (eval compile load)
  (LOAD-MACSYMA-MACROS PROCS))
#+ITS
(DEFUN TR-FASL-FILE-NAME (FOO)
  (NAMESTRING `((dsk  ,(get! foo 'fasl-dir)) ,foo fasl)))

#+Multics
(defun tr-fasl-file-name (foo)
  (NAMESTRING `,(executable-dir foo)))

#+ITS
(defvar transl-autoload-oldio-name "DSK:MACSYM;TRANSL AUTOLO")

#+Multics
(defvar transl-autoload-oldio-name (NAMESTRING (executable-dir 'transl/.autoload)))

(DEFVAR MODULE-STACK NIL)

(DEFMACRO TRANSL-MODULE (NAME)
  (IF (NOT (MEMQ NAME TRANSL-MODULES))
      (MAXIMA-ERROR "Not a TRANSL-MODULE, see LIBMAX;TRANSM >"))
  #+PDP10
  (PROGN (PUSH NAME MODULE-STACK)
	 (PUSH '(EVAL-WHEN (COMPILE EVAL)
			   (TRANSL-MODULE-DO-IT)
			   (POP MODULE-STACK))
	       EOF-COMPILE-QUEUE)
	 (PUTPROP NAME NIL 'FUNCTIONS)
	 (PUTPROP NAME NIL 'TR-PROPS)
	 (PUTPROP NAME NIL 'VARIABLES)
	 (DO ((L TRANSL-MODULES (CDR L)))
	     ((NULL L))
	   (IF (EQ (CAR L) NAME) NIL
	       (LOAD-MODULE-INFO (CAR L))))
	 )
  #+PDP10
  `(PROGN 'COMPILE
	  (DEFPROP ,NAME
	    ,(CADDR (NAMELIST (TRUENAME INFILE)))
	    VERSION)
	  (PROGN
	    ,(IF (NOT (GET NAME 'NO-LOAD-AUTO))
		 `(OR (GET 'TRANSL-AUTOLOAD 'VERSION)
		      ($LOAD ',transl-autoload-oldio-name)))
	    ,@(MAPCAR #'(LAMBDA (U)
			  `(OR (GET ',U 'VERSION)
			       ($LOAD
				',(TR-FASL-FILE-NAME U))))
		      (GET NAME 'FIRST-LOAD))))
  #-PDP10
  '(COMMENT THERE ARE REASONABLE THINGS TO DO HERE)
  )

#+PDP10

(DEFUN LAMBDA-TYPE (ARGLIST)
  (COND ((NULL ARGLIST)
	 '(*EXPR . (NIL . 0)))
	((ATOM ARGLIST)
	 '(*LEXPR . NIL))
	(T
	 ;; (FOO BAR &OPTIONAL ... &REST L &AUX)
	 ;; #O776 is the MAX MAX.
	 (DO ((MIN 0)
	      (MAX 0)
	      (OPTIONAL NIL)
	      (L ARGLIST (CDR L)))
	     ((NULL L)
	      (IF (= MIN MAX)
		  `(*EXPR . (NIL . ,MIN))
		  `(*LEXPR . (,MIN . ,MAX))))
	   (CASE (CAR L)
	     ((&REST)
	      (SETQ MAX #o776)
	      (SETQ L NIL))
	     ((&OPTIONAL)
	      (SETQ OPTIONAL T))
	     ((&AUX)
	      (SETQ L NIL))
	     (t
	      (IF (AND (SYMBOLP (CAR L))
		       (= #\& (GETCHARN (CAR L) 1)))
		  (RETURN
		   (LAMBDA-TYPE
		    (MAXIMA-ERROR (LIST "arglist has unknown &keword" (CAR L))
			   ARGLIST 'WRNG-TYPE-ARG))))
	      (OR OPTIONAL (SETQ MIN (f1+ MIN)))
	      (SETQ MAX (f1+ MAX))))))))

(def-def-property translate (form))

#+cl
(defmacro def%tr (name lambda-list &body body &aux definition)
  (setq definition
	(COND ((AND (NULL BODY) (SYMBOLP LAMBDA-LIST))
	       `(DEF-SAME%TR ,NAME ,LAMBDA-LIST))
	      (T
	       #+PDP10
	       (ENTERQ NAME (GET (CAR MODULE-STACK) 'TR-PROPS))
	       `(defun-prop (,name translate) ,lambda-list ,@ body))))
  `(eval-when (compile eval load)
	  #+lispm(record-source-file-name ',name 'def%tr)
	  ,definition))


#-cl
(DEFMACRO DEF%TR (NAME LAMBDA-LIST &REST BODY)
  (COND ((AND (NULL BODY) (SYMBOLP LAMBDA-LIST))
	 `(DEF-SAME%TR ,NAME ,LAMBDA-LIST))
	(T
	 #+PDP10
	 (ENTERQ NAME (GET (CAR MODULE-STACK) 'TR-PROPS))
	 `(def-translate-property ,NAME
	    ,LAMBDA-LIST ,@BODY))))

(DEFMACRO DEF-SAME%TR (NAME SAME-AS)
  ;; right now MUST be used in the SAME file.
  #+PDP10
  (ENTERQ NAME (GET (CAR MODULE-STACK) 'TR-PROPS))
  `(PUTPROP ',NAME
	    (OR (GET ',SAME-AS 'TRANSLATE)
		(MAXIMA-ERROR '|No TRANSLATE property to alias.| ',SAME-AS))
	    'TRANSLATE))

(DEFMACRO DEF%TR-INHERIT (FROM &REST OTHERS)
  #+PDP10
  (mapc #'(lambda (name)
	    (enterq name (get (car module-stack) 'tr-props)))
	others)
  `(LET ((TR-PROP (OR (GET ',FROM 'TRANSLATE)
		      (MAXIMA-ERROR '|No TRANSLATE property to alias.| ',FROM))))
     (MAPC #'(LAMBDA (NAME) (PUTPROP NAME TR-PROP 'TRANSLATE))
	   ',OTHERS)))

#+PDP10
(DEFUN PUT-LAMBDA-TYPE (NAME ARGL)
       (LET ((LAMBDA-TYPE (LAMBDA-TYPE ARGL)))
	    (PUTPROP NAME T (CAR LAMBDA-TYPE))
	    (ARGS NAME (CDR LAMBDA-TYPE))))


(DEFMACRO DEFTRFUN (NAME ARGL &REST BODY)
  #+PDP10
  (PROGN (ENTERQ NAME (GET (CAR MODULE-STACK) 'FUNCTIONS))
	 (PUT-LAMBDA-TYPE NAME ARGL))
  `(DEFUN ,NAME ,ARGL ,@BODY))

(DEFMACRO DEFTRVAR (NAME VALUE &REST IGNORE-DOC) IGNORE-DOC
  ;; to be used to put the simple default value in
  ;; the autoload file. Should be generalized to include
  ;; BINDING methods.
  #+PDP10
  (PROGN (ENTERQ NAME (GET (CAR MODULE-STACK) 'VARIABLES))
	 (PUTPROP NAME (IF (FBOUNDP 'MACRO-EXPAND)
			   (MACRO-EXPAND VALUE)
			   VALUE)
		  'VALUE))
  `(DEFVAR ,NAME ,VALUE))

;#+PDP10
;(PROGN 'COMPILE

;(defun get! (a b) (or (get a b) (get! (MAXIMA-ERROR (list "undefined" b "property")
;					     a 'wrng-type-arg)
;				      b)))

;(defun print-defprop (symbol prop stream)
;       (print `(defprop ,symbol ,(get symbol prop) ,prop) stream))

;(defun save-module-info (module stream)
;  (putprop module `(,(status uname) ,(status dow) ,(status date))
;	   'last-compiled)
;  (print-defprop module 'last-compiled stream)
;  (print-defprop module 'functions stream)
;  (print-defprop module 'variables stream)
;  (print-defprop module 'tr-props stream)
;  (DO ((VARIABLES (get module 'VARIABLES) (CDR VARIABLES)))
;      ((NULL VARIABLES))
;    (print-defprop (car variables) 'value stream)
;    ;; *NB*
;    ;; this depends on knowing about the internal workings
;    ;; of the maclisp compiler!!!!
;    (print `(defprop ,(car variables)
;	      (special ,(car variables))
;	      special)
;	   stream)
;    )
;  (DO ((FUNCTIONS (GET MODULE 'FUNCTIONS) (CDR FUNCTIONS)))
;      ((NULL FUNCTIONS))
;    ;; *NB* depends on maclisp compiler.
;    (LET ((X (GETL (CAR FUNCTIONS) '(*LEXPR *EXPR))))
;      (IF X
;	  (PRINT-DEFPROP (CAR FUNCTIONS) (CAR X) STREAM)))
;    (LET ((X (ARGS (CAR FUNCTIONS))))
;      (IF X
;	  (PRINT `(ARGS ',(CAR FUNCTIONS) ',X) STREAM)))))

;(defun save-enable-module-info (module stream)
;  ;; this outputs stuff to be executed in the context
;  ;; of RUNTIME of the modules, using information gotten
;  ;; by the SAVE done by the above function.
;  (print `(defprop ,module ,(tr-fasl-file-name module) fasload) stream)
;  ;; FASLOAD property lets us share the TR-FASL-FILE-NAME
;  ;; amoung the various autoload properties.
;  (print `(map1-put-if-nil ',(get module 'functions)
;			   (get ',module 'fasload)
;			   'autoload)
;	 stream)
;  (print `(map1-put-if-nil ',(get module 'tr-props)
;			   (get ',module 'fasload)
;			   'autoload-translate)
;	 stream)
;  (print `(map1-put-if-nil ',(get module 'tr-props)
;			   (or (get 'autoload-translate 'subr)
;			       (MAXIMA-ERROR 'autoload-translate 'subr
;				      'fail-act))
;			   'translate)
;	 stream)
;  (do ((variables (get module 'variables) (cdr variables)))
;      ((null variables))
;    (print `(or (boundp ',(car variables))
;		(setq ,(car variables) ,(get (car variables) 'value)))
;	   stream)))

;(eval-when (compile eval)
;	   (or (get 'iota 'macro) (load '|liblsp;iota fasl|)))

;(DEFUN TRANSL-MODULE-DO-IT (&AUX (*print-base* 10.) (*NOPOINT NIL))
;       (let ((module (CAR MODULE-STACK)))
;	    (cond ((AND (GET module 'ttime-auto)
;			(macsyma-compilation-p))
;		   (iota ((f `((dsk ,(get! module 'dir))
;			       ,module _auto_) 'out))
;			 (and ttynotes (format tyo "~&;MODULE : ~A~%" MODULE))
;			 (save-module-info module f)
;			 (renamef f "* AUTOLO"))
;		   (INSTALL-TRANSL-AUTOLOADS)))))

;(defun load-module-info (module)
;       (IF (AND (GET MODULE 'TTIME-AUTO)
;		;; Assume we are the only MCL compiling
;		;; a transl module at this time.
;		(NOT (GET MODULE 'LAST-COMPILED)))
;	   (LET ((FILE `((dsk ,(get! module 'dir))
;			 ,module autolo)))
;		(COND ((PROBE-FILE FILE)
;		       (AND TTYNOTES
;			    (FORMAT TYO "~&;Loading ~A info~%"
;				    file))
;		       (LOAD FILE))
;		      (T
;		       (AND TTYNOTES
;			    (FORMAT TYO "~&; ~A NOT FOUND~%"
;				    file)))))))

;(defvar autoload-install-file "dsk:macsyma;transl autoload")

;(DEFUN UNAME-TIMEDATE (FORMAT-STREAM)
;       (LET (((YEAR MONTH DAY) (STATUS DATE))
;	     ((HOUR MINUTE SECOND) (STATUS DAYTIME)))
;	    (FORMAT FORMAT-STREAM
;		    "by ~A on ~A, ~
;	       ~[January~;February~;March~;April~;May~;June~;July~;August~
;	       ~;September~;October~;November~;December~] ~
;	       ~D, 19~D, at ~D:~2,'0D:~2,'0D"
;		    (status uname)
;		    (status dow)
;		    (f1- month) day year
;		    hour minute second)))

;(defun install-transl-autoloads ()
;       (MAPC #'LOAD-MODULE-INFO TRANSL-MODULES)
;       (iota ((f (mergef "* _TEMP"
;			 autoload-install-file)
;		 '(out ascii)))
;	     (PRINT `(progn
;		      (DEFPROP TRANSL-AUTOLOAD ,(Uname-timedate nil) VERSION)
;		      (OR (GET 'TRANSL-AUTOLOAD 'SUBR)
;			  (load '((dsk macsym)trhook fasl)))
;		      (setq transl-modules
;			    ',transl-modules))
;		    F)
;	     (DO ((MODULES TRANSL-MODULES (CDR MODULES)))
;		 ((NULL MODULES)
;		  (renamef f autoload-install-file))
;		 (and (get (car modules) 'ttime-auto)
;		      (save-enable-module-info (car modules) f)))))

;(defun tr-tagS ()
;  ;; trivial convenience utility.
;  (iota ((f `((dsk ,(get 'transl 'dir)) transl ntags) 'out))
;    (do ((l transl-modules (cdr l)))
;	((null l)
;	 (close f)
;	 (valret
;	  (symbolconc '|:TAGS | (NAMESTRING F) '|
; |)))
;      (or (get (car l) 'pseudo)
;	  (format f "DSK:~A;~A >~%,LISP~%~%"
;		  (get! (car l) 'dir) (car l))))))

;;;; end of #+PDP10 I/O code.

;)

;;; in PDP-10 maclisp OP is a subr-pointer.
;;; system-dependance macro-fied away in PROCS.

(DEFMACRO TPROP-CALL (OP FORM)
  `(subr-call ,op ,form))

(DEFMACRO DEF-AUTOLOAD-TRANSLATE (&REST FUNS)
  #+PDP10
  `(LET ((A-SUBR (OR (GET 'AUTOLOAD-TRANSLATE 'SUBR)
		     (MAXIMA-ERROR 'LOSE 'AUTOLOAD-TRANSLATE 'FAIL-ACT))))
     (mapc #'(lambda (u)
	      (or (get u 'translate)
		  (putprop u A-SUBR 'TRANSLATE)))
	   ',FUNS))
  #-PDP10
  `(COMMENT *AUTOLOADING?* ,@FUNS))


;;; declarations for the TRANSL PACKAGE.

(declare-top 
  (SPECIAL *TRANSL-SOURCES*)
  ;; The warning an error subsystem.
  (SPECIAL TR-ABORT				; set this T if you want to abort.
	   *TRANSLATION-MSGS-FILES*)		; the stream to print messages to.
  (*LEXPR WARN-UNDEDECLARED
	  TR-NARGS-CHECK
	  WARN-MEVAL
	  WARN-MODE
	  WARN-FEXPR
	  TELL)
  
  (*LEXPR PUMP-STREAM				; file hacking
	  )
  
  ;; State variables.
  
  (SPECIAL PRE-TRANSL-FORMS*			; push onto this, gets output first into the
						; transl file.
	   *WARNED-UN-DECLARED-VARS*
	   *WARNED-FEXPRS* 
	   *WARNED-MODE-VARS*
	   *WARNED-UNDEFINED-VARS*
	   WARNED-UNDEFINED-VARIABLES
	   TR-ABORT
	   TRANSL-FILE
	   *IN-COMPFILE*
	   *IN-TRANSLATE-FILE*
	   *IN-TRANSLATE*
	   *PRE-TRANSL-FORMS* 
	   *NEW-AUTOLOAD-ENTRIES*		; new entries created by TRANSL. 
	   *UNTRANSLATED-FUNCTIONS-CALLED*
	   )
  
  ;; General entry points.
  
  (*EXPR TRANSLATE
	 ;; Takes a macsyma form, returns a form
	 ;; such that the CAR is the MODE and the
	 ;; CDR is the equivalent lisp form.
	 ;; For the meaning of the second argument to TRANSLATE
	 ;; see the code. When calling TRANSLATE from outside of
	 ;; itself, the second arg is always left out.
	 TR-ARGS				; mapcar of translate, strips off the modes.
	 DTRANSLATE				; CDR TRANSLATE
	 CALL-AND-SIMP				; (MODE F ARGL) generates `(,F ,@ARGL)
	 ;; sticks on the mode and a SIMPLIFY if needed.
	 ARRAY-MODE
	 FUNCTION-MODE
	 VALUE-MODE
	 TBIND					; For META binding of variables.
	 TUNBIND				; unbind.
	 TUNBINDS				; a list.
	 TBOUNDP				; is the variable lexicaly bound?
	 TEVAL					; get the var replacement. Now this is always
	 ;; the same as the var itself. BUT it could be use
	 ;; to do internal-mode stuff.
	 
	 PUSH-PRE-TRANSL-FORM
	 
	 )
  (*LEXPR TR-LOCAL-EXP
	  ;; conses up a lambda, calls, translate, strips...
	  TR-LAMBDA
	  ;; translate only a standard lambda expression
	  )
  
  (*EXPR FREE-LISP-VARS
	 PUSH-DEFVAR
	 TR-TRACE-EXIT
	 TR-TRACE-ENTRY
	 side-effect-free-check
	 tbound-free-vars)
  
  (*EXPR TRANSLATE-FUNCTION TR-MFUN DCONVX)
  
  ;; these special declarations are for before DEFMVAR
  (SPECIAL $ERREXP $LOADPRINT $NUMER $SAVEDEF $NOLABELS $FUNCTIONS $PROPS 
	   $FILENAME $FILENUM $DIREC $DEVICE MUNBOUND $VALUES $TRANSRUN
	   ST OLDST  $VERSION
	   REPHRASE $PACKAGEFILE
	   DSKFNP)
  
  ;; end of COMPLR declarations section.
  )

(defmacro bind-transl-state (&rest forms)
  ;; this binds all transl state variables to NIL.
  ;; and binds user-settable variables to themselves.
  ;; $TRANSCOMPILE for example can be set to TRUE while translating
  ;; a file, yet will only affect that file.
  ;; Called in 3 places, for compactness maybe this should be a PROGV
  ;; which references a list of variables?
  `(let (*WARNED-UN-DECLARED-VARS*
	 *WARNED-FEXPRS* 
	 *WARNED-MODE-VARS*
	 *WARNED-UNDEFINED-VARS*
	 WARNED-UNDEFINED-VARIABLES
	 TR-ABORT
	 TRANSL-FILE
	 *IN-COMPFILE*
	 *IN-TRANSLATE-FILE*
	 *IN-TRANSLATE*
	 *PRE-TRANSL-FORMS* 
	 *NEW-AUTOLOAD-ENTRIES*
	 ($TR_SEMICOMPILE $TR_SEMICOMPILE)
	 (ARRAYS NIL)
	 (EXPRS NIL)
	 (LEXPRS NIL)
	 (FEXPRS NIL)
	 (SPECIALS NIL)
	 (DECLARES NIL)
	 ($TRANSCOMPILE $TRANSCOMPILE)
	 ($TR_NUMER $TR_NUMER)
	 DEFINED_VARIABLES)
     ,@FORMS))



#-(or cl Multics)
(DEFMACRO TR-FORMAT (STRING &REST ARGL)
  `(MFORMAT *TRANSLATION-MSGS-FILES*
	    ,STRING ,@ARGL))

;;; Is MFORMAT really prepared in general to handle
;;; the above form. Certainly not on Multics.
#+(and Multics (not cl))
(defmacro tr-format (string &rest argl)
  `(cond ((consp *translation-msgs-files*)
	  (mapcar #'(lambda (file)
		     (mformat file ,string ,@argl))
		  *translation-msgs-files*))
	 (t (mformat *translation-msgs-files* ,string ,@argl))))

#+cl
(defun tr-format (sstring &rest argl &aux strs)
  (cond ((consp *translation-msgs-files*)(setq strs *translation-msgs-files*))
	(t (setq strs (list *translation-msgs-files*))))
  (sloop for v in strs
	do (apply 'mformat v sstring argl)))

 
;;; for debugging convenience:
(DEFMACRO TR (EXP) `(BIND-TRANSL-STATE (TRANSLATE ,EXP)))

;;; These are used by MDEFUN and MFUNCTION-CALL.
;;; N.B. this has arguments evaluated twice because I am too lazy to
;;; use a LET around things.

(DEFMACRO PUSH-INFO (NAME INFO STACK)
  `(LET ((*INFO* (ASSQ ,NAME ,STACK)))
     (COND (*INFO* ;;; should check for compatibility of INFO here.
	    )
	   (T
	    (PUSH (CONS ,NAME ,INFO) ,STACK)))))

(DEFMACRO GET-INFO (NAME STACK)
  `(CDR (ASSQ ,NAME ,STACK)))

(DEFMACRO POP-INFO (NAME STACK)
  `(LET ((*INFO* (ASSQ ,NAME ,STACK)))
     (COND (*INFO*
	    (SETQ ,STACK (zl-DELETE *INFO* ,STACK))
	    (CDR *INFO*))
	   (T NIL))))

(DEFMACRO TOP-IND (STACK)
  `(COND ((NULL ,STACK) NIL)
	 (T
	  (CAAR ,STACK))))