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;;; -*- Package: C; Log: C.Log -*-
;;;
;;; **********************************************************************
;;; This code was written as part of the CMU Common Lisp project at
;;; Carnegie Mellon University, and has been placed in the public domain.
;;; If you want to use this code or any part of CMU Common Lisp, please contact
;;; Scott Fahlman or slisp-group@cs.cmu.edu.
;;;
(ext:file-comment
10
  "$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/compiler/meta-vmdef.lisp,v 1.4 1993/08/12 10:56:31 ram Exp $")
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;;;
;;; **********************************************************************
;;;
;;; This file contains the implementation-independent facilities used for
;;; defining the compiler's interface to the VM in a given implementation
;;; that are needed at meta-compile time.  They are seperated out from
;;; vmdef.lisp so that they can be compiled and loaded without trashing the
;;; running compiler.
;;;
;;; Written by Rob MacLachlan
;;; Seperated from vmdef.lisp by William Lott
;;;
(in-package :c)

(export '(meta-sc-or-lose meta-sb-or-lose meta-sc-number-or-lose
	  define-storage-base define-storage-class define-move-function
	  define-move-function define-move-vop 
	  meta-primitive-type-or-lose
	  def-primitive-type def-primitive-type-alias
	  primitive-type-vop define-vop sc-case sc-is
	  note-this-location note-next-instruction))



;;;; 

;;; META-SC-OR-LOSE, META-SB-OR-LOSE, META-SC-NUMBER-OR-LOSE  --  Internal
;;;
;;;    Like the non-meta versions, but go for the meta-compile-time info.
;;; These should not be used after load time, since compiling the compiler
;;; changes the definitions.
;;;
(defun meta-sc-or-lose (x)
  (the sc
       (or (gethash x (backend-meta-sc-names *target-backend*))
	   (error "~S is not a defined storage class." x))))
;;;
(defun meta-sb-or-lose (x)
  (the sb
       (or (gethash x (backend-meta-sb-names *target-backend*))
	   (error "~S is not a defined storage base." x))))
;;;
(defun meta-sc-number-or-lose (x)
  (the sc-number (sc-number (meta-sc-or-lose x))))



;;;; Storage class and storage base definition:

;;; Define-Storage-Base  --  Public
;;;
;;;    Enter the basic structure at meta-compile time, and then fill in the
;;; missing slots at load time.
;;;
(defmacro define-storage-base (name kind &key size)
  "Define-Storage-Base Name Kind {Key Value}*
  Define a storage base having the specified Name.  Kind may be :Finite,
  :Unbounded or :Non-Packed.  The following keywords are legal:

  :Size <Size>
      Specify the number of locations in a :Finite SB or the initial size of a
      :Unbounded SB."
  (check-type name symbol)
  (check-type kind (member :finite :unbounded :non-packed))
  (ecase kind
    (:non-packed
     (when size
       (error "Size specification meaningless in a ~S SB." kind)))
    ((:finite :unbounded)
     (unless size (error "Size not specified in a ~S SB." kind))
     (check-type size unsigned-byte)))
    
  (let ((res (if (eq kind :non-packed)
		 (make-sb :name name :kind kind)
		 (make-finite-sb :name name :kind kind :size size))))
    `(progn
       (eval-when (compile load eval)
	 (setf (gethash ',name (backend-meta-sb-names *target-backend*))
	       ',res))
       ,(if (eq kind :non-packed)
	    `(setf (gethash ',name (backend-sb-names *target-backend*))
		   (copy-sb ',res))
	    `(let ((res (copy-finite-sb ',res)))
	       (setf (finite-sb-always-live res)
		     (make-array ',size :initial-element #*))
	       (setf (finite-sb-conflicts res)
		     (make-array ',size :initial-element '#()))
	       (setf (finite-sb-live-tns res)
		     (make-array ',size :initial-element nil))
	       (setf (gethash ',name (backend-sb-names *target-backend*))
		     res)))

       (setf (backend-sb-list *target-backend*)
	     (cons (sb-or-lose ',name)
		   (remove ',name (backend-sb-list *target-backend*)
			   :key #'sb-name)))
       ',name)))


;;; Define-Storage-Class  --  Public
;;;
;;;
(defmacro define-storage-class (name number sb-name &key (element-size '1)
				     (alignment '1) locations reserve-locations
				     save-p alternate-scs constant-scs)
  "Define-Storage-Class Name Number Storage-Base {Key Value}*
  Define a storage class Name that uses the named Storage-Base.  Number is a
  small, non-negative integer that is used as an alias.  The following
  keywords are defined:

  :Element-Size Size
      The size of objects in this SC in whatever units the SB uses.  This
      defaults to 1.

  :Alignment Size
      The alignment restrictions for this SC.  TNs will only be allocated at
      offsets that are an even multiple of this number.  Defaults to 1.

  :Locations (Location*)
      If the SB is :Finite, then this is a list of the offsets within the SB
      that are in this SC.

  :Reserve-Locations (Location*)
      A subset of the Locations that the register allocator should try to
      reserve for operand loading (instead of to hold variable values.)

  :Save-P {T | NIL}
      If T, then values stored in this SC must be saved in one of the
      non-save-p :Alternate-SCs across calls.

  :Alternate-SCs (SC*)
      Indicates other SCs that can be used to hold values from this SC across
      calls or when storage in this SC is exhausted.  The SCs should be
      specified in order of decreasing \"goodness\".  There must be at least
      one SC in an unbounded SB, unless this SC is only used for restricted or
      wired TNs.

  :Constant-SCs (SC*)
      A list of the names of all the constant SCs that can be loaded into this
      SC by a move function."
  
  (check-type name symbol)
  (check-type number sc-number)
  (check-type sb-name symbol)
  (check-type locations list)
  (check-type reserve-locations list)
  (check-type save-p boolean)
  (check-type alternate-scs list)
  (check-type constant-scs list)
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  (unless (= (logcount alignment) 1)
    (error "Alignment is not a power of two: ~S" alignment))
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  (let ((sb (meta-sb-or-lose sb-name)))
    (if (eq (sb-kind sb) :finite)
	(let ((size (sb-size sb))
	      (element-size (eval element-size)))
	  (check-type element-size unsigned-byte)
	  (dolist (el locations)
	    (check-type el unsigned-byte)
	    (unless (<= 1 (+ el element-size) size)
	      (error "SC element ~D out of bounds for ~S." el sb))))
	(when locations
	  (error ":Locations is meaningless in a ~S SB." (sb-kind sb))))

    (unless (subsetp reserve-locations locations)
      (error "Reserve-Locations not a subset of Locations."))

    (when (and (or alternate-scs constant-scs)
	       (eq (sb-kind sb) :non-packed))
      (error "Meaningless to specify alternate or constant SCs in a ~S SB."
	     (sb-kind sb))))

  (let ((nstack-p
	 (if (or (eq sb-name 'non-descriptor-stack)
		 (find 'non-descriptor-stack
		       (mapcar #'meta-sc-or-lose alternate-scs)
		       :key #'(lambda (x)
				(sb-name (sc-sb x)))))
	     t nil)))
    `(progn
       (eval-when (compile load eval)
	 (let ((res (make-sc :name ',name :number ',number
			     :sb (meta-sb-or-lose ',sb-name)
			     :element-size ,element-size
			     :alignment ,alignment
			     :locations ',locations
			     :reserve-locations ',reserve-locations
			     :save-p ',save-p
			     :number-stack-p ,nstack-p
			     :alternate-scs (mapcar #'meta-sc-or-lose
						    ',alternate-scs)
			     :constant-scs (mapcar #'meta-sc-or-lose
						   ',constant-scs))))
	   (setf (gethash ',name (backend-meta-sc-names *target-backend*)) res)
	   (setf (svref (backend-meta-sc-numbers *target-backend*) ',number)
		 res)
	   (setf (svref (sc-load-costs res) ',number) 0)))

       (let ((old (svref (backend-sc-numbers *target-backend*) ',number)))
	 (when (and old (not (eq (sc-name old) ',name)))
	   (warn "Redefining SC number ~D from ~S to ~S." ',number
		 (sc-name old) ',name)))
       
       (setf (svref (backend-sc-numbers *target-backend*) ',number)
	     (meta-sc-or-lose ',name))
       (setf (gethash ',name (backend-sc-names *target-backend*))
	     (meta-sc-or-lose ',name))
       (setf (sc-sb (sc-or-lose ',name)) (sb-or-lose ',sb-name))
       ',name)))


;;;; Move/coerce definition:

;;; DO-SC-PAIRS  --  Internal
;;;
;;;    Given a list of paris of lists of SCs (as given to DEFINE-MOVE-VOP,
;;; etc.), bind TO-SC and FROM-SC to all the combinations.
;;;
(defmacro do-sc-pairs ((from-sc-var to-sc-var scs) &body body)
  `(do ((froms ,scs (cddr froms))
	(tos (cdr ,scs) (cddr tos)))
       ((null froms))
     (dolist (from (car froms))
       (let ((,from-sc-var (meta-sc-or-lose from)))
	 (dolist (to (car tos))
	   (let ((,to-sc-var (meta-sc-or-lose to)))
	     ,@body))))))


;;; DEFINE-MOVE-FUNCTION  --  Public
;;;
(defmacro define-move-function ((name cost) lambda-list scs &body body)
  "Define-Move-Function (Name Cost) lambda-list ({(From-SC*) (To-SC*)}*) form*
  Define the function Name and note it as the function used for moving operands
  from the From-SCs to the To-SCs.  Cost is the cost of this move operation.
  The function is called with three arguments: the VOP (for context), and the
  source and destination TNs.  An ASSEMBLE form is wrapped around the body.
  All uses of DEFINE-MOVE-FUNCTION should be compiled before any uses of
  DEFINE-VOP."
  (when (or (oddp (length scs)) (null scs))
    (error "Malformed SCs spec: ~S." scs))
  (check-type cost index)
  `(progn
     (eval-when (compile load eval)
       (do-sc-pairs (from-sc to-sc ',scs)
	 (unless (eq from-sc to-sc)
	   (let ((num (sc-number from-sc)))
	     (setf (svref (sc-move-functions to-sc) num) ',name)
	     (setf (svref (sc-load-costs to-sc) num) ',cost)))))

     (defun ,name ,lambda-list
       (new-assem:assemble (*code-segment* ,(first lambda-list))
	 ,@body))))


(defconstant sc-vop-slots '((:move . sc-move-vops)
			    (:move-argument . sc-move-arg-vops)))

;;; DEFINE-MOVE-VOP  --  Public
;;;
;;;    We record the VOP and costs for all SCs that we can move between
;;; (including implicit loading).
;;;
(defmacro define-move-vop (name kind &rest scs)
  "Define-Move-VOP Name {:Move | :Move-Argument} {(From-SC*) (To-SC*)}*
  Make Name be the VOP used to move values in the specified From-SCs to the
  representation of the To-SCs.  If kind is :Move-Argument, then the VOP takes
  an extra argument, which is the frame pointer of the frame to move into." 
  (when (or (oddp (length scs)) (null scs))
    (error "Malformed SCs spec: ~S." scs))
  (let ((accessor (or (cdr (assoc kind sc-vop-slots))
		      (error "Unknown kind ~S." kind))))
    `(progn
       ,@(when (eq kind :move)
	   `((eval-when (compile load eval)
	       (do-sc-pairs (from-sc to-sc ',scs)
		 (compute-move-costs from-sc to-sc
				     ,(vop-parse-cost
				       (vop-parse-or-lose name)))))))
       
       (let ((vop (template-or-lose ',name)))
	 (do-sc-pairs (from-sc to-sc ',scs)
	   (dolist (dest-sc (cons to-sc (sc-alternate-scs to-sc)))
	     (let ((vec (,accessor dest-sc)))
	       (let ((scn (sc-number from-sc)))
		 (setf (svref vec scn)
		       (adjoin-template vop (svref vec scn))))
	       (dolist (sc (append (sc-alternate-scs from-sc)
				   (sc-constant-scs from-sc)))
		 (let ((scn (sc-number sc)))
		   (setf (svref vec scn)
			 (adjoin-template vop (svref vec scn))))))))))))


;;;; Primitive type definition:

;;; META-PRIMITIVE-TYPE-OR-LOSE  --  Interface
;;;
(defun meta-primitive-type-or-lose (name)
  (the primitive-type
       (or (gethash name (backend-meta-primitive-type-names *target-backend*))
	   (error "~S is not a defined primitive type." name))))

;;; Def-Primitive-Type  --  Public
;;;
;;;    If the primitive-type structure already exists, we destructively modify
;;; it so that existing references in templates won't be invalidated.
;;; Primitive-type definition isn't done at meta-compile time, so this doesn't
;;; break the running compiler.
;;;
(defmacro def-primitive-type (name scs &key (type name))
  "Def-Primitive-Type Name (SC*) {Key Value}*
   Define a primitive type Name.  Each SC specifies a Storage Class that values
   of this type may be allocated in.  The following keyword options are
   defined:
  
  :Type
      The type descriptor for the Lisp type that is equivalent to this type
      (defaults to Name.)"
  (check-type name symbol)
  (check-type scs list)
  (let ((scns (mapcar #'meta-sc-number-or-lose scs))
	(get-type `(specifier-type ',type)))
    `(progn
       (eval-when (compile load eval)
	 (setf (gethash ',name (backend-meta-primitive-type-names
				*target-backend*))
	       (make-primitive-type :name ',name  :scs ',scns
				    :type ,get-type)))
       ,(once-only ((n-old `(gethash ',name
				     (backend-primitive-type-names
				      *target-backend*)))
		    (n-type get-type))
	  `(progn
	     (cond (,n-old
		    (setf (primitive-type-scs ,n-old) ',scns)
		    (setf (primitive-type-type ,n-old) ,n-type))
		   (t
		    (setf (gethash ',name
				   (backend-primitive-type-names
				    *target-backend*))
			  (make-primitive-type :name ',name  :scs ',scns
					       :type ,n-type))))
	     ',name)))))

;;; Def-Primitive-Type-Alias  --  Public
;;;
;;; Just record the translation.
;;; 
(defmacro def-primitive-type-alias (name result)
  "DEF-PRIMITIVE-TYPE-ALIAS Name Result
  Define name to be an alias for Result in VOP operand type restrictions."
  `(eval-when (compile load eval)
     (setf (gethash ',name (backend-primitive-type-aliases *target-backend*))
	   ',result)
     ',name))

(defparameter primitive-type-slot-alist
  '((:check . primitive-type-check)))

;;; Primitive-Type-Vop  --  Public
;;;
(defmacro primitive-type-vop (vop kinds &rest types)
  "Primitive-Type-VOP Vop (Kind*) Type*
  Annotate all the specified primitive Types with the named VOP under each of
  the specified kinds:

  :Check
      A one argument one result VOP that moves the argument to the result,
      checking that the value is of this type in the process."
  (let ((n-vop (gensym))
	(n-type (gensym)))
    `(let ((,n-vop (template-or-lose ',vop)))
       ,@(mapcar
	  #'(lambda (type)
	      `(let ((,n-type (primitive-type-or-lose ',type)))
		 ,@(mapcar
		    #'(lambda (kind)
			(let ((slot (or (cdr (assoc kind
						    primitive-type-slot-alist))
					(error "Unknown kind: ~S." kind))))
			  `(setf (,slot ,n-type) ,n-vop)))
		    kinds)))
	  types)
       nil)))

;;; SC-ALLOWED-BY-PRIMITIVE-TYPE  --  Interface
;;;
;;;    Return true if SC is either one of Ptype's SC's, or one of those SC's
;;; alternate or constant SCs.
;;;
(defun meta-sc-allowed-by-primitive-type (sc ptype)
  (declare (type sc sc) (type primitive-type ptype))
  (let ((scn (sc-number sc)))
    (dolist (allowed (primitive-type-scs ptype) nil)
      (when (eql allowed scn)
	(return t))
      (let ((allowed-sc (svref (backend-meta-sc-numbers *target-backend*)
			       allowed)))
	(when (or (member sc (sc-alternate-scs allowed-sc))
		  (member sc (sc-constant-scs allowed-sc)))
	  (return t))))))



;;;; VOP definition structures:
;;;
;;;    Define-VOP uses some fairly complex data structures at meta-compile
;;; time, both to hold the results of parsing the elaborate syntax and to
;;; retain the information so that it can be inherited by other VOPs.

;;; The VOP-Parse structure holds everything we need to know about a VOP at
;;; meta-compile time.
;;;
(defstruct (vop-parse
	    (:print-function %print-vop-parse)
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	    (:make-load-form-fun :just-dump-it-normally)
	    (:pure t))
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  ;;
  ;; The name of this VOP.
  (name nil :type symbol)
  ;;
  ;; If true, then the name of the VOP we inherit from.
  (inherits nil :type (or symbol null))
  ;;
  ;; Lists of Operand-Parse structures describing the arguments, results and
  ;; temporaries of the VOP.
  (args nil :type list)
  (results nil :type list)
  (temps nil :type list)
  ;;
  ;; Operand-Parse structures containing information about more args and
  ;; results.  If null, then there there are no more operands of that kind.
  (more-args nil :type (or operand-parse null))
  (more-results nil :type (or operand-parse null))
  ;;
  ;; A list of all the above together.
  (operands nil :type list)
  ;;
  ;; Names of variables that should be declared ignore.
  (ignores () :type list)
  ;;
  ;; True if this is a :Conditional VOP.
  (conditional-p nil)
  ;;
  ;; Argument and result primitive types.  These are pulled out of the
  ;; operands, since we often want to change them without respecifying the
  ;; operands.
  (arg-types :unspecified :type (or (member :unspecified) list))
  (result-types :unspecified :type (or (member :unspecified) list))
  ;;
  ;; The guard expression specified, or NIL if none.
  (guard nil)
  ;;
  ;; The cost of and body code for the generator.
  (cost 0 :type unsigned-byte)
  (body :unspecified :type (or (member :unspecified) list))
  ;;
  ;; Info for VOP variants.  The list of forms to be evaluated to get the
  ;; variant args for this VOP, and the list of variables to be bound to the
  ;; variant args.
  (variant () :type list)
  (variant-vars () :type list)
  ;;
  ;; Variables bound to the VOP and Vop-Node when in the generator body.
  (vop-var (gensym) :type symbol)
  (node-var nil :type (or symbol null))
  ;;
  ;; A list of the names of the codegen-info arguments to this VOP.
  (info-args () :type list)
  ;;
  ;; An efficiency note associated with this VOP.
  (note nil :type (or string null))
  ;;
  ;; A list of the names of the Effects and Affected attributes for this VOP.
  (effects '(any) :type list)
  (affected '(any) :type list)
  ;;
  ;; A list of the names of functions this VOP is a translation of and the
  ;; policy that allows this translation to be done.  :Fast is a safe default,
  ;; since it isn't a safe policy.
  (translate () :type list)
  (policy :fast :type policies)
  ;;
  ;; Stuff used by life analysis.
  (save-p nil :type (member t nil :compute-only :force-to-stack))
  ;;
  ;; Info about how to emit move-argument VOPs for the more operand in
  ;; call/return VOPs.
  (move-args nil :type (member nil :local-call :full-call :known-return)))


(defprinter vop-parse
  name
  (inherits :test inherits)
  args
  results
  temps
  (more-args :test more-args)
  (more-results :test more-results)
  (conditional-p :test conditional-p)
  ignores
  arg-types
  result-types
  cost
  body
  (variant :test variant)
  (variant-vars :test variant-vars)
  (info-args :test info-args)
  (note :test note)
  effects
  affected
  translate
  policy
  (save-p :test save-p)
  (move-args :test move-args))

;;; The Operand-Parse structure contains stuff we need to know about and
;;; operand or temporary at meta-compile time.  Besides the obvious stuff, we
;;; also store the names of per-operand temporaries here.
;;;
(defstruct (operand-parse
	    (:print-function %print-operand-parse)
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	    (:make-load-form-fun :just-dump-it-normally)
	    (:pure t))
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  ;;
  ;; Name of the operand (which we bind to the TN).
  (name nil :type symbol)
  ;;
  ;; The way this operand is used:
  (kind (required-argument)
	:type (member :argument :result :temporary
		      :more-argument :more-result))
  ;;
  ;; If true, the name of an operand that this operand is targeted to.  This is
  ;; only meaningful in :Argument and :Temporary operands.
  (target nil :type (or symbol null))
  ;;
  ;; Temporary that holds the TN-Ref for this operand.  Temp-Temp holds the
  ;; write reference that begins a temporary's lifetime.
  (temp (gensym) :type symbol)
  (temp-temp nil :type (or symbol null))
  ;;
  ;; The time that this operand is first live and the time at which it becomes
  ;; dead again.  These are time-specs, as returned by parse-time-spec. 
  born
  dies
  ;;
  ;; A list of the names of the SCs that this operand is allowed into.  If
  ;; false, there is no restriction.
  (scs nil :type list)
  ;;
  ;; Variable that is bound to the load TN allocated for this operand, or to
  ;; NIL if no load-TN was allocated.
  (load-tn (gensym) :type symbol)
  ;;
  ;; An expression that tests whether to do automatic operand loading.
  (load t)
  ;;
  ;; In a wired or restricted temporary this is the SC the TN is to be packed
  ;; in.  Null otherwise.
  (sc nil :type (or symbol null))
  ;;
  ;; If non-null, we are a temp wired to this offset in SC.
  (offset nil :type (or unsigned-byte null)))


(defprinter operand-parse
  name
  kind
  (target :test target)
  born
  dies
  (scs :test scs)
  (load :test load)
  (sc :test sc)
  (offset :test offset))


;;;; Random utilities:

;;; Find-Operand  --  Internal
;;;
;;;    Find the operand or temporary with the specifed Name in the VOP Parse.
;;; If there is no such operand, signal an error.  Also error if the operand
;;; kind isn't one of the specified Kinds.  If Error-P is NIL, just return NIL
;;; if there is no such operand.
;;;
(defun find-operand (name parse &optional
			  (kinds '(:argument :result :temporary))
			  (error-p t))
  (declare (symbol name) (type vop-parse parse) (list kinds))
  (let ((found (find name (vop-parse-operands parse)
		     :key #'operand-parse-name)))
    (if found
	(unless (member (operand-parse-kind found) kinds)
	  (error "Operand ~S isn't one of these kinds: ~S." name kinds))
	(when error-p
	  (error "~S is not an operand to ~S." name (vop-parse-name parse))))
    found))


;;; VOP-Parse-Or-Lose  --  Internal
;;;
;;;    Get the VOP-Parse structure for Name or die trying.  For all
;;; meta-compile time uses, the VOP-Parse should be used instead of the
;;; VOP-Info
;;;
(defun vop-parse-or-lose (name &optional (backend *target-backend*))
  (the vop-parse
       (or (gethash name (backend-parsed-vops backend))
	   (error "~S is not the name of a defined VOP." name))))


;;; Access-Operands  --  Internal
;;;
;;;    Return a list of let-forms to parse a tn-ref list into a the temps
;;; specified by the operand-parse structures.  More-Operand is the
;;; Operand-Parse describing any more operand, or NIL if none.  Refs is an
;;; expression that evaluates into the first tn-ref.
;;;
(defun access-operands (operands more-operand refs)
  (declare (list operands))
  (collect ((res))
    (let ((prev refs))
      (dolist (op operands)
	(let ((n-ref (operand-parse-temp op)))
	  (res `(,n-ref ,prev))
	  (setq prev `(tn-ref-across ,n-ref))))

      (when more-operand
	(res `(,(operand-parse-name more-operand) ,prev))))
    (res)))


;;; Ignore-Unreferenced-Temps --  Internal
;;;
;;;    Used with Access-Operands to prevent warnings for TN-Ref temps not used
;;; by some particular function.  It returns the name of the last operand, or
;;; NIL if Operands is NIL.
;;;
(defun ignore-unreferenced-temps (operands)
  (when operands
    (operand-parse-temp (car (last operands)))))


;;; VOP-Spec-Arg  --  Internal
;;;
;;;    Grab an arg out of a VOP spec, checking the type and syntax and stuff.
;;;
(defun vop-spec-arg (spec type &optional (n 1) (last t))
  (let ((len (length spec)))
    (when (<= len n)
      (error "~:R argument missing: ~S." n spec))
    (when (and last (> len (1+ n)))
      (error "Extra junk at end of ~S." spec))
    (let ((thing (elt spec n)))
      (unless (typep thing type)
	(error "~:R argument is not a ~S: ~S." n type spec))
      thing)))


;;;; Time specs:

;;; Parse-Time-Spec  --  Internal
;;;
;;;    Return a time spec describing a time during the evaluation of a VOP,
;;; used to delimit operand and temporary lifetimes.  The representation is a
;;; cons whose CAR is the number of the evaluation phase and the CDR is the
;;; sub-phase.  The sub-phase is 0 in the :Load and :Save phases. 
;;;
(defun parse-time-spec (spec)
  (let ((dspec (if (atom spec) (list spec 0) spec)))
    (unless (and (= (length dspec) 2)
		 (typep (second dspec) 'unsigned-byte))
      (error "Malformed time specifier: ~S." spec))

    (cons (case (first dspec)
	    (:load 0)
	    (:argument 1)
	    (:eval 2)
	    (:result 3)
	    (:save 4)
	    (t
	     (error "Unknown phase in time specifier: ~S." spec)))
	  (second dspec))))


;;; Time-Spec-Order  --  Internal
;;;
;;;    Return true if the time spec X is the same or later time than Y.
;;;
(defun time-spec-order (x y)
  (or (> (car x) (car y))
      (and (= (car x) (car y))
	   (>= (cdr x) (cdr y)))))
 

;;;; Emit function generation:

(defun compute-temporaries-description (parse)
  (let ((temps (vop-parse-temps parse)))
    (when temps
      (let ((results (make-array (length temps)
				 :element-type '(unsigned-byte 16)))
	    (index 0))
	(dolist (temp temps)
	  (declare (type operand-parse temp))
	  (let ((sc (operand-parse-sc temp))
		(offset (operand-parse-offset temp)))
	    (assert sc)
	    (setf (aref results index)
		  (if offset
		      (+ (ash offset (1+ sc-bits))
			 (ash (meta-sc-number-or-lose sc) 1)
			 1)
		      (ash (meta-sc-number-or-lose sc) 1))))
	  (incf index))
	results))))

(defun compute-ref-ordering (parse)
  (let* ((num-args (+ (length (vop-parse-args parse))
		      (if (vop-parse-more-args parse) 1 0)))
	 (num-results (+ (length (vop-parse-results parse))
			 (if (vop-parse-more-results parse) 1 0)))
	 (index 0))
    (collect ((refs) (targets))
      (dolist (op (vop-parse-operands parse))
	(when (operand-parse-target op)
	  (unless (member (operand-parse-kind op) '(:argument :temporary))
	    (error "Cannot target a ~S operand: ~S." (operand-parse-kind op)
		   (operand-parse-name op)))
	  (let ((target (find-operand (operand-parse-target op) parse
				      '(:temporary :result))))
	    (targets (+ (* index max-vop-tn-refs)
			(ecase (operand-parse-kind target)
			  (:result
			   (+ (position target (vop-parse-results parse))
			      num-args))
			  (:temporary
			   (+ (* (position target (vop-parse-temps parse)) 2)
			      num-args num-results)))))))
	(let ((born (operand-parse-born op))
	      (dies (operand-parse-dies op)))
	  (ecase (operand-parse-kind op)
	    (:argument
	     (refs (cons (cons dies nil) index)))
	    (:more-argument
	     (refs (cons (cons dies nil) index)))
	    (:result
	     (refs (cons (cons born t) index)))
	    (:more-result
	     (refs (cons (cons born t) index)))
	    (:temporary
	     (refs (cons (cons dies nil) index))
	     (incf index)
	     (refs (cons (cons born t) index))))
	  (incf index)))
      (let* ((sorted (sort (refs)
			   #'(lambda (x y)
			       (let ((x-time (car x))
				     (y-time (car y)))
				 (if (time-spec-order x-time y-time)
				     (if (time-spec-order y-time x-time)
					 (and (not (cdr x)) (cdr y))
					 nil)
				     t)))
			   :key #'car))
	     (ordering (make-array (length sorted)
				   :element-type '(mod #.max-vop-tn-refs))))
	(let ((index 0))
	  (dolist (ref sorted)
	    (setf (aref ordering index) (cdr ref))
	    (incf index)))
	`(:num-args ,num-args
	  :num-results ,num-results
	  :ref-ordering ,ordering
	  ,@(when (targets)
	      `(:targets
		,(make-array (length (targets))
			     :element-type '(mod #.(* max-vop-tn-refs 2))
			     :initial-contents (targets)))))))))

(defun make-emit-function-and-friends (parse)
  `(:emit-function #'emit-generic-vop
    :temps ',(compute-temporaries-description parse)
    ,@(compute-ref-ordering parse)))


;;;; Generator functions:

;;; FIND-MOVE-FUNCTIONS  --  Internal
;;;
;;;    Return an alist that translates from lists of SCs we can load OP from to
;;; the move function used for loading those SCs.  We quietly ignore
;;; restrictions to :non-packed (constant) and :unbounded SCs, since we don't
;;; load into those SCs.
;;;
(defun find-move-functions (op load-p)
  (collect ((funs))
    (dolist (sc-name (operand-parse-scs op))
      (let* ((sc (meta-sc-or-lose sc-name))
	     (scn (sc-number sc))
	     (load-scs (append (when load-p
				 (sc-constant-scs sc))
			       (sc-alternate-scs sc))))
	(cond
	 (load-scs
	  (dolist (alt load-scs)
	    (unless (member (sc-name alt) (operand-parse-scs op) :test #'eq)
	      (let* ((altn (sc-number alt))
		     (name (if load-p
			       (svref (sc-move-functions sc) altn)
			       (svref (sc-move-functions alt) scn)))
		     (found (or (assoc alt (funs) :test #'member)
				(rassoc name (funs)))))
		(unless name
		  (error "No move function defined to ~:[save~;load~] SC ~S~
			  ~:[to~;from~] from SC ~S."
			 load-p sc-name load-p (sc-name alt)))
		
		(cond (found
		       (unless (eq (cdr found) name)
			 (error "Can't tell whether to ~:[save~;load~] with ~S~@
				 or ~S when operand is in SC ~S."
				load-p name (cdr found) (sc-name alt)))
		       (pushnew alt (car found)))
		      (t
		       (funs (cons (list alt) name))))))))
	 ((member (sb-kind (sc-sb sc)) '(:non-packed :unbounded)))
	 (t
	  (error "SC ~S has no alternate~:[~; or constant~] SCs, yet it is~@
	          mentioned in the restriction for operand ~S."
		 sc-name load-p (operand-parse-name op))))))
    (funs)))

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;;; CALL-MOVE-FUNCTION  --  Internal
;;;
;;;    Return a form to load/save the specified operand when it has a load TN.
;;; For any given SC that we can load from, there must be a unique load
;;; function.  If all SCs we can load from have the same move function, then we
;;; just call that when there is a load TN.  If there are multiple possible
;;; move functions, then we dispatch off of the operand TN's type to see which
;;; move function to use.
;;;
(defun call-move-function (parse op load-p)
  (let ((funs (find-move-functions op load-p))
	(load-tn (operand-parse-load-tn op)))
    (if funs
	(let* ((tn `(tn-ref-tn ,(operand-parse-temp op)))
	       (n-vop (or (vop-parse-vop-var parse)
			  (setf (vop-parse-vop-var parse) (gensym))))
	       (form (if (rest funs)
			 `(sc-case ,tn
			    ,@(mapcar #'(lambda (x)
					  `(,(mapcar #'sc-name (car x))
					    ,(if load-p
						 `(,(cdr x) ,n-vop ,tn
						   ,load-tn)
						 `(,(cdr x) ,n-vop ,load-tn
						   ,tn))))
				      funs))
			 (if load-p
			     `(,(cdr (first funs)) ,n-vop ,tn ,load-tn)
			     `(,(cdr (first funs)) ,n-vop ,load-tn ,tn)))))
	  (if (eq (operand-parse-load op) t)
	      `(when ,load-tn ,form)
	      `(when (eq ,load-tn ,(operand-parse-name op))
		 ,form)))
	`(when ,load-tn
	   (error "Load TN allocated, but no move function?~@
	           VM definition inconsistent, recompile and try again.")))))

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;;; DECIDE-TO-LOAD  --  Internal
;;;
;;;    Return the TN that we should bind to the operand's var in the generator
;;; body.  In general, this involves evaluating the :LOAD-IF test expression.
;;;
(defun decide-to-load (parse op)
  (let ((load (operand-parse-load op))
	(load-tn (operand-parse-load-tn op))
	(temp (operand-parse-temp op)))
    (if (eq load t)
	`(or ,load-tn (tn-ref-tn ,temp))
	(collect ((binds)
		  (ignores))
	  (dolist (x (vop-parse-operands parse))
	    (when (member (operand-parse-kind x) '(:argument :result))
	      (let ((name (operand-parse-name x)))
		(binds `(,name (tn-ref-tn ,(operand-parse-temp x))))
		(ignores name))))
	  `(if (and ,load-tn
		    (let ,(binds)
		      #+new-compiler
		      (declare (ignorable ,@(ignores)))
		      #-new-compiler
		      (progn ,@(ignores))
		      ,load))
	       ,load-tn
	       (tn-ref-tn ,temp))))))

;;; Make-Generator-Function  --  Internal
;;;
;;;    Make a lambda that parses the VOP TN-Refs, does automatic operand
;;; loading, and runs the appropriate code generator.
;;;
(defun make-generator-function (parse)
  (declare (type vop-parse parse))
  (let ((n-vop (vop-parse-vop-var parse))
	(operands (vop-parse-operands parse))
	(n-info (gensym)) (n-variant (gensym)))
    (collect ((binds)
	      (loads)
	      (saves))
      (dolist (op operands)
	(ecase (operand-parse-kind op)
	  ((:argument :result)
	   (let ((temp (operand-parse-temp op))
		 (name (operand-parse-name op)))
	     (cond ((and (operand-parse-load op) (operand-parse-scs op))
		    (binds `(,(operand-parse-load-tn op)
			     (tn-ref-load-tn ,temp)))
		    (binds `(,name ,(decide-to-load parse op)))
		    (if (eq (operand-parse-kind op) :argument)
			(loads (call-move-function parse op t))
			(saves (call-move-function parse op nil))))
		   (t
		    (binds `(,name (tn-ref-tn ,temp)))))))
	  (:temporary
	   (binds `(,(operand-parse-name op)
		    (tn-ref-tn ,(operand-parse-temp op)))))
	  ((:more-argument :more-result))))

      `#'(lambda (,n-vop)
	   (let* (,@(access-operands (vop-parse-args parse)
				     (vop-parse-more-args parse)
				     `(vop-args ,n-vop))
		  ,@(access-operands (vop-parse-results parse)
				     (vop-parse-more-results parse)
				     `(vop-results ,n-vop))
		  ,@(access-operands (vop-parse-temps parse) nil
				     `(vop-temps ,n-vop))
		  ,@(when (vop-parse-info-args parse)
		      `((,n-info (vop-codegen-info ,n-vop))
			,@(mapcar #'(lambda (x) `(,x (pop ,n-info)))
				  (vop-parse-info-args parse))))
		  ,@(when (vop-parse-variant-vars parse)
		      `((,n-variant (vop-info-variant (vop-info ,n-vop)))
			,@(mapcar #'(lambda (x) `(,x (pop ,n-variant)))
				  (vop-parse-variant-vars parse))))
		  ,@(when (vop-parse-node-var parse)
		      `((,(vop-parse-node-var parse) (vop-node ,n-vop))))
		  ,@(binds))
	     (declare (ignore ,@(vop-parse-ignores parse)))
	     ,@(loads)
	     (new-assem:assemble (*code-segment* ,n-vop)
	       ,@(vop-parse-body parse))
	     ,@(saves))))))


;;; Parse-Operands  --  Internal
;;;
;;;    Given a list of operand specifications as given to Define-VOP, return a
;;; list of Operand-Parse structures describing the fixed operands, and a
;;; single Operand-Parse describing any more operand.  If we are inheriting a
;;; VOP, we default attributes to the inherited operand of the same name.
;;;
(defun parse-operands (parse specs kind)
  (declare (list specs)
	   (type (member :argument :result) kind))
  (let ((num -1)
	(more nil))
    (collect ((operands))
      (dolist (spec specs)
	(unless (and (consp spec) (symbolp (first spec)) (oddp (length spec)))
	  (error "Malformed operand specifier: ~S." spec))
	(when more
	  (error "More operand isn't last: ~S." specs)) 
	(let* ((name (first spec))
	       (old (if (vop-parse-inherits parse)
			(find-operand name
				      (vop-parse-or-lose
				       (vop-parse-inherits parse))
				      (list kind)
				      nil)
			nil))
	       (res (if old
			(make-operand-parse
			 :name name
			 :kind kind
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