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;;;; transforms and other stuff used to compile ALIEN operations
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
;;;;
;;;; This software is derived from the CMU CL system, which was
;;;; written at Carnegie Mellon University and released into the
;;;; public domain. The software is in the public domain and is
;;;; provided with absolutely no warranty. See the COPYING and CREDITS
;;;; files for more information.
(in-package "SB!C")
;;;; DEFKNOWNs
(defknown %sap-alien (system-area-pointer alien-type) alien-value
(flushable movable))
(defknown alien-sap (alien-value) system-area-pointer
(flushable movable))
(defknown slot (alien-value symbol) t
(flushable recursive))
(defknown %set-slot (alien-value symbol t) t
(recursive))
(defknown %slot-addr (alien-value symbol) (alien (* t))
(flushable movable recursive))
(defknown deref (alien-value &rest index) t
(flushable))
(defknown %set-deref (alien-value t &rest index) t
())
(defknown %deref-addr (alien-value &rest index) (alien (* t))
(flushable movable))
(defknown %heap-alien (heap-alien-info) t
(flushable))
(defknown %set-heap-alien (heap-alien-info t) t
())
(defknown %heap-alien-addr (heap-alien-info) (alien (* t))
(flushable movable))
(defknown make-local-alien (local-alien-info) t
())
(defknown note-local-alien-type (local-alien-info t) null
())
(defknown local-alien (local-alien-info t) t
(flushable))
(defknown %local-alien-forced-to-memory-p (local-alien-info) (member t nil)
(movable))
(defknown %set-local-alien (local-alien-info t t) t
())
(defknown %local-alien-addr (local-alien-info t) (alien (* t))
(flushable movable))
(defknown dispose-local-alien (local-alien-info t) t
())
(defknown %cast (alien-value alien-type) alien
(flushable movable))
(defknown naturalize (t alien-type) alien
(flushable movable))
(defknown deport (alien alien-type) t
(flushable movable))
(defknown extract-alien-value (system-area-pointer index alien-type) t
(flushable))
(defknown deposit-alien-value (system-area-pointer index alien-type t) t
())
(defknown alien-funcall (alien-value &rest *) *
(any recursive))
(defknown %alien-funcall (system-area-pointer alien-type &rest *) *)
;;;; cosmetic transforms
(deftransform slot ((object slot)
((alien (* t)) symbol))
'(slot (deref object) slot))
(deftransform %set-slot ((object slot value)
((alien (* t)) symbol t))
'(%set-slot (deref object) slot value))
(deftransform %slot-addr ((object slot)
((alien (* t)) symbol))
'(%slot-addr (deref object) slot))
;;;; SLOT support
(defun find-slot-offset-and-type (alien slot)
(unless (constant-continuation-p slot)
(give-up-ir1-transform
"The slot is not constant, so access cannot be open coded."))
(let ((type (continuation-type alien)))
(unless (alien-type-type-p type)
(give-up-ir1-transform))
(let ((alien-type (alien-type-type-alien-type type)))
(unless (alien-record-type-p alien-type)
(give-up-ir1-transform))
(let* ((slot-name (continuation-value slot))
(field (find slot-name (alien-record-type-fields alien-type)
:key #'alien-record-field-name)))
(unless field
(abort-ir1-transform "~S doesn't have a slot named ~S"
alien
slot-name))
(values (alien-record-field-offset field)
(alien-record-field-type field))))))
#+nil ;; Shouldn't be necessary.
(defoptimizer (slot derive-type) ((alien slot))
(block nil
(catch 'give-up-ir1-transform
(multiple-value-bind (slot-offset slot-type)
(find-slot-offset-and-type alien slot)
(declare (ignore slot-offset))
(return (make-alien-type-type slot-type))))
*wild-type*))
(deftransform slot ((alien slot) * * :important t)
(multiple-value-bind (slot-offset slot-type)
(find-slot-offset-and-type alien slot)
`(extract-alien-value (alien-sap alien)
,slot-offset
',slot-type)))
#+nil ;; ### But what about coercions?
(defoptimizer (%set-slot derive-type) ((alien slot value))
(block nil
(catch 'give-up-ir1-transform
(multiple-value-bind (slot-offset slot-type)
(find-slot-offset-and-type alien slot)
(declare (ignore slot-offset))
(let ((type (make-alien-type-type slot-type)))
(assert-continuation-type value type)
(return type))))
*wild-type*))
(deftransform %set-slot ((alien slot value) * * :important t)
(multiple-value-bind (slot-offset slot-type)
(find-slot-offset-and-type alien slot)
`(deposit-alien-value (alien-sap alien)
,slot-offset
',slot-type
value)))
(defoptimizer (%slot-addr derive-type) ((alien slot))
(block nil
(catch 'give-up-ir1-transform
(multiple-value-bind (slot-offset slot-type)
(find-slot-offset-and-type alien slot)
(declare (ignore slot-offset))
(return (make-alien-type-type
(make-alien-pointer-type :to slot-type)))))
*wild-type*))
(deftransform %slot-addr ((alien slot) * * :important t)
(multiple-value-bind (slot-offset slot-type)
(find-slot-offset-and-type alien slot)
(/noshow "in DEFTRANSFORM %SLOT-ADDR, creating %SAP-ALIEN")
`(%sap-alien (sap+ (alien-sap alien) (/ ,slot-offset sb!vm:byte-bits))
',(make-alien-pointer-type :to slot-type))))
;;;; DEREF support
(defun find-deref-alien-type (alien)
(let ((alien-type (continuation-type alien)))
(unless (alien-type-type-p alien-type)
(give-up-ir1-transform))
(let ((alien-type (alien-type-type-alien-type alien-type)))
(if (alien-type-p alien-type)
alien-type
(give-up-ir1-transform)))))
(defun find-deref-element-type (alien)
(let ((alien-type (find-deref-alien-type alien)))
(typecase alien-type
(alien-pointer-type
(alien-pointer-type-to alien-type))
(alien-array-type
(alien-array-type-element-type alien-type))
(t
(give-up-ir1-transform)))))
(defun compute-deref-guts (alien indices)
(let ((alien-type (find-deref-alien-type alien)))
(typecase alien-type
(alien-pointer-type
(when (cdr indices)
(abort-ir1-transform "too many indices for pointer deref: ~D"
(length indices)))
(let ((element-type (alien-pointer-type-to alien-type)))
(if indices
(let ((bits (alien-type-bits element-type))
(alignment (alien-type-alignment element-type)))
(unless bits
(abort-ir1-transform "unknown element size"))
(unless alignment
(abort-ir1-transform "unknown element alignment"))
(values '(offset)
`(* offset
,(align-offset bits alignment))
element-type))
(values nil 0 element-type))))
(alien-array-type
(let* ((element-type (alien-array-type-element-type alien-type))
(bits (alien-type-bits element-type))
(alignment (alien-type-alignment element-type))
(dims (alien-array-type-dimensions alien-type)))
(unless (= (length indices) (length dims))
(give-up-ir1-transform "incorrect number of indices"))
(unless bits
(give-up-ir1-transform "Element size is unknown."))
(unless alignment
(give-up-ir1-transform "Element alignment is unknown."))
(if (null dims)
(values nil 0 element-type)
(let* ((arg (gensym))
(args (list arg))
(offsetexpr arg))
(dolist (dim (cdr dims))
(let ((arg (gensym)))
(push arg args)
(setf offsetexpr `(+ (* ,offsetexpr ,dim) ,arg))))
(values (reverse args)
`(* ,offsetexpr
,(align-offset bits alignment))
element-type)))))
(t
(abort-ir1-transform "~S not either a pointer or array type."
alien-type)))))
#+nil ;; Shouldn't be necessary.
(defoptimizer (deref derive-type) ((alien &rest noise))
(declare (ignore noise))
(block nil
(catch 'give-up-ir1-transform
(return (make-alien-type-type (find-deref-element-type alien))))
*wild-type*))
(deftransform deref ((alien &rest indices) * * :important t)
(multiple-value-bind (indices-args offset-expr element-type)
(compute-deref-guts alien indices)
`(lambda (alien ,@indices-args)
(extract-alien-value (alien-sap alien)
,offset-expr
',element-type))))
#+nil ;; ### Again, the value might be coerced.
(defoptimizer (%set-deref derive-type) ((alien value &rest noise))
(declare (ignore noise))
(block nil
(catch 'give-up-ir1-transform
(let ((type (make-alien-type-type
(make-alien-pointer-type
:to (find-deref-element-type alien)))))
(assert-continuation-type value type)
(return type)))
*wild-type*))
(deftransform %set-deref ((alien value &rest indices) * * :important t)
(multiple-value-bind (indices-args offset-expr element-type)
(compute-deref-guts alien indices)
`(lambda (alien value ,@indices-args)
(deposit-alien-value (alien-sap alien)
,offset-expr
',element-type
value))))
(defoptimizer (%deref-addr derive-type) ((alien &rest noise))
(declare (ignore noise))
(block nil
(catch 'give-up-ir1-transform
(return (make-alien-type-type
(make-alien-pointer-type
:to (find-deref-element-type alien)))))
*wild-type*))
(deftransform %deref-addr ((alien &rest indices) * * :important t)
(multiple-value-bind (indices-args offset-expr element-type)
(compute-deref-guts alien indices)
(/noshow "in DEFTRANSFORM %DEREF-ADDR, creating (LAMBDA .. %SAP-ALIEN)")
`(lambda (alien ,@indices-args)
(%sap-alien (sap+ (alien-sap alien) (/ ,offset-expr sb!vm:byte-bits))
',(make-alien-pointer-type :to element-type)))))
;;;; support for aliens on the heap
(defun heap-alien-sap-and-type (info)
(unless (constant-continuation-p info)
(give-up-ir1-transform "info not constant; can't open code"))
(let ((info (continuation-value info)))
(values (heap-alien-info-sap-form info)
(heap-alien-info-type info))))
#+nil ; shouldn't be necessary
(defoptimizer (%heap-alien derive-type) ((info))
(block nil
(catch 'give-up
(multiple-value-bind (sap type) (heap-alien-sap-and-type info)
(declare (ignore sap))
(return (make-alien-type-type type))))
*wild-type*))
(deftransform %heap-alien ((info) * * :important t)
(multiple-value-bind (sap type) (heap-alien-sap-and-type info)
`(extract-alien-value ,sap 0 ',type)))
#+nil ;; ### Again, deposit value might change the type.
(defoptimizer (%set-heap-alien derive-type) ((info value))
(block nil
(catch 'give-up-ir1-transform
(multiple-value-bind (sap type) (heap-alien-sap-and-type info)
(declare (ignore sap))
(let ((type (make-alien-type-type type)))
(assert-continuation-type value type)
(return type))))
*wild-type*))
(deftransform %set-heap-alien ((info value) (heap-alien-info *) * :important t)
(multiple-value-bind (sap type) (heap-alien-sap-and-type info)
`(deposit-alien-value ,sap 0 ',type value)))
(defoptimizer (%heap-alien-addr derive-type) ((info))
(block nil
(catch 'give-up-ir1-transform
(multiple-value-bind (sap type) (heap-alien-sap-and-type info)
(declare (ignore sap))
(return (make-alien-type-type (make-alien-pointer-type :to type)))))
*wild-type*))
(deftransform %heap-alien-addr ((info) * * :important t)
(multiple-value-bind (sap type) (heap-alien-sap-and-type info)
(/noshow "in DEFTRANSFORM %HEAP-ALIEN-ADDR, creating %SAP-ALIEN")
`(%sap-alien ,sap ',type)))
;;;; support for local (stack or register) aliens
(deftransform make-local-alien ((info) * * :important t)
(unless (constant-continuation-p info)
(abort-ir1-transform "Local alien info isn't constant?"))
(let* ((info (continuation-value info))
(alien-type (local-alien-info-type info))
(bits (alien-type-bits alien-type)))
(unless bits
(abort-ir1-transform "unknown size: ~S" (unparse-alien-type alien-type)))
(/noshow "in DEFTRANSFORM MAKE-LOCAL-ALIEN" info)
(/noshow (local-alien-info-force-to-memory-p info))
(/noshow alien-type (unparse-alien-type alien-type) (alien-type-bits alien-type))
(if (local-alien-info-force-to-memory-p info)
#!+x86 `(truly-the system-area-pointer
(%primitive alloc-alien-stack-space
,(ceiling (alien-type-bits alien-type)
sb!vm:byte-bits)))
#!-x86 `(truly-the system-area-pointer
(%primitive alloc-number-stack-space
,(ceiling (alien-type-bits alien-type)
sb!vm:byte-bits)))
(let* ((alien-rep-type-spec (compute-alien-rep-type alien-type))
(alien-rep-type (specifier-type alien-rep-type-spec)))
(cond ((csubtypep (specifier-type 'system-area-pointer)
alien-rep-type)
'(int-sap 0))
((ctypep 0 alien-rep-type) 0)
((ctypep 0.0f0 alien-rep-type) 0.0f0)
((ctypep 0.0d0 alien-rep-type) 0.0d0)
(t
(compiler-error
"Aliens of type ~S cannot be represented immediately."
(unparse-alien-type alien-type))))))))
(deftransform note-local-alien-type ((info var) * * :important t)
;; FIXME: This test and error occur about a zillion times. They
;; could be factored into a function.
(unless (constant-continuation-p info)
(abort-ir1-transform "Local alien info isn't constant?"))
(let ((info (continuation-value info)))
(/noshow "in DEFTRANSFORM NOTE-LOCAL-ALIEN-TYPE" info)
(/noshow (local-alien-info-force-to-memory-p info))
(unless (local-alien-info-force-to-memory-p info)
(let ((var-node (continuation-use var)))
(/noshow var-node (ref-p var-node))
(when (ref-p var-node)
(propagate-to-refs (ref-leaf var-node)
(specifier-type
(compute-alien-rep-type
(local-alien-info-type info))))))))
nil)
(deftransform local-alien ((info var) * * :important t)
(unless (constant-continuation-p info)
(abort-ir1-transform "Local alien info isn't constant?"))
(let* ((info (continuation-value info))
(alien-type (local-alien-info-type info)))
(/noshow "in DEFTRANSFORM LOCAL-ALIEN" info alien-type)
(/noshow (local-alien-info-force-to-memory-p info))
(if (local-alien-info-force-to-memory-p info)
`(extract-alien-value var 0 ',alien-type)
`(naturalize var ',alien-type))))
(deftransform %local-alien-forced-to-memory-p ((info) * * :important t)
(unless (constant-continuation-p info)
(abort-ir1-transform "Local alien info isn't constant?"))
(let ((info (continuation-value info)))
(local-alien-info-force-to-memory-p info)))
(deftransform %set-local-alien ((info var value) * * :important t)
(unless (constant-continuation-p info)
(abort-ir1-transform "Local alien info isn't constant?"))
(let* ((info (continuation-value info))
(alien-type (local-alien-info-type info)))
(if (local-alien-info-force-to-memory-p info)
`(deposit-alien-value var 0 ',alien-type value)
'(error "This should be eliminated as dead code."))))
(defoptimizer (%local-alien-addr derive-type) ((info var))
(if (constant-continuation-p info)
(let* ((info (continuation-value info))
(alien-type (local-alien-info-type info)))
(make-alien-type-type (make-alien-pointer-type :to alien-type)))
*wild-type*))
(deftransform %local-alien-addr ((info var) * * :important t)
(unless (constant-continuation-p info)
(abort-ir1-transform "Local alien info isn't constant?"))
(let* ((info (continuation-value info))
(alien-type (local-alien-info-type info)))
(/noshow "in DEFTRANSFORM %LOCAL-ALIEN-ADDR, creating %SAP-ALIEN")
(if (local-alien-info-force-to-memory-p info)
`(%sap-alien var ',(make-alien-pointer-type :to alien-type))
(error "This shouldn't happen."))))
(deftransform dispose-local-alien ((info var) * * :important t)
(unless (constant-continuation-p info)
(abort-ir1-transform "Local alien info isn't constant?"))
(let* ((info (continuation-value info))
(alien-type (local-alien-info-type info)))
(if (local-alien-info-force-to-memory-p info)
#!+x86 `(%primitive dealloc-alien-stack-space
,(ceiling (alien-type-bits alien-type)
sb!vm:byte-bits))
#!-x86 `(%primitive dealloc-number-stack-space
,(ceiling (alien-type-bits alien-type)
sb!vm:byte-bits))
nil)))
;;;; %CAST
(defoptimizer (%cast derive-type) ((alien type))
(or (when (constant-continuation-p type)
(let ((alien-type (continuation-value type)))
(when (alien-type-p alien-type)
(make-alien-type-type alien-type))))
*wild-type*))
(deftransform %cast ((alien target-type) * * :important t)
(unless (constant-continuation-p target-type)
(give-up-ir1-transform
"The alien type is not constant, so access cannot be open coded."))
(let ((target-type (continuation-value target-type)))
(cond ((or (alien-pointer-type-p target-type)
(alien-array-type-p target-type)
(alien-function-type-p target-type))
`(naturalize (alien-sap alien) ',target-type))
(t
(abort-ir1-transform "cannot cast to alien type ~S" target-type)))))
;;;; ALIEN-SAP, %SAP-ALIEN, %ADDR, etc.
(deftransform alien-sap ((alien) * * :important t)
(let ((alien-node (continuation-use alien)))
(typecase alien-node
(combination
(extract-function-args alien '%sap-alien 2)
'(lambda (sap type)
(declare (ignore type))
sap))
(t
(give-up-ir1-transform)))))
(defoptimizer (%sap-alien derive-type) ((sap type))
(declare (ignore sap))
(if (constant-continuation-p type)
(make-alien-type-type (continuation-value type))
*wild-type*))
(deftransform %sap-alien ((sap type) * * :important t)
(give-up-ir1-transform
;; FIXME: The hardcoded newline here causes more-than-usually
;; screwed-up formatting of the optimization note output.
"could not optimize away %SAP-ALIEN: forced to do runtime ~@
allocation of alien-value structure"))
;;;; NATURALIZE/DEPORT/EXTRACT/DEPOSIT magic
(flet ((%computed-lambda (compute-lambda type)
(declare (type function compute-lambda))
(unless (constant-continuation-p type)
(give-up-ir1-transform
"The type is not constant at compile time; can't open code."))
(handler-case
(let ((result (funcall compute-lambda (continuation-value type))))
(/noshow "in %COMPUTED-LAMBDA" (continuation-value type) result)
result)
(error (condition)
(compiler-error "~A" condition)))))
(deftransform naturalize ((object type) * * :important t)
(%computed-lambda #'compute-naturalize-lambda type))
(deftransform deport ((alien type) * * :important t)
(%computed-lambda #'compute-deport-lambda type))
(deftransform extract-alien-value ((sap offset type) * * :important t)
(%computed-lambda #'compute-extract-lambda type))
(deftransform deposit-alien-value ((sap offset type value) * * :important t)
(%computed-lambda #'compute-deposit-lambda type)))
;;;; a hack to clean up divisions
(defun count-low-order-zeros (thing)
(typecase thing
(continuation
(if (constant-continuation-p thing)
(count-low-order-zeros (continuation-value thing))
(count-low-order-zeros (continuation-use thing))))
(combination
(case (continuation-function-name (combination-fun thing))
((+ -)
(let ((min most-positive-fixnum)
(itype (specifier-type 'integer)))
(dolist (arg (combination-args thing) min)
(if (csubtypep (continuation-type arg) itype)
(setf min (min min (count-low-order-zeros arg)))
(return 0)))))
(*
(let ((result 0)
(itype (specifier-type 'integer)))
(dolist (arg (combination-args thing) result)
(if (csubtypep (continuation-type arg) itype)
(setf result (+ result (count-low-order-zeros arg)))
(return 0)))))
(ash
(let ((args (combination-args thing)))
(if (= (length args) 2)
(let ((amount (second args)))
(if (constant-continuation-p amount)
(max (+ (count-low-order-zeros (first args))
(continuation-value amount))
0)
0))
0)))
(t
0)))
(integer
(if (zerop thing)
most-positive-fixnum
(do ((result 0 (1+ result))
(num thing (ash num -1)))
((logbitp 0 num) result))))
(t
0)))
(deftransform / ((numerator denominator) (integer integer))
(unless (constant-continuation-p denominator)
(give-up-ir1-transform))
(let* ((denominator (continuation-value denominator))
(bits (1- (integer-length denominator))))
(unless (= (ash 1 bits) denominator)
(give-up-ir1-transform))
(let ((alignment (count-low-order-zeros numerator)))
(unless (>= alignment bits)
(give-up-ir1-transform))
`(ash numerator ,(- bits)))))
(deftransform ash ((value amount))
(let ((value-node (continuation-use value)))
(unless (and (combination-p value-node)
(eq (continuation-function-name (combination-fun value-node))
'ash))
(give-up-ir1-transform))
(let ((inside-args (combination-args value-node)))
(unless (= (length inside-args) 2)
(give-up-ir1-transform))
(let ((inside-amount (second inside-args)))
(unless (and (constant-continuation-p inside-amount)
(not (minusp (continuation-value inside-amount))))
(give-up-ir1-transform)))))
(extract-function-args value 'ash 2)
'(lambda (value amount1 amount2)
(ash value (+ amount1 amount2))))
;;;; ALIEN-FUNCALL support
(deftransform alien-funcall ((function &rest args)
((alien (* t)) &rest *) *
:important t)
(let ((names (make-gensym-list (length args))))
(/noshow "entering first DEFTRANSFORM ALIEN-FUNCALL" function args)
`(lambda (function ,@names)
(alien-funcall (deref function) ,@names))))
(deftransform alien-funcall ((function &rest args) * * :important t)
(let ((type (continuation-type function)))
(unless (alien-type-type-p type)
(give-up-ir1-transform "can't tell function type at compile time"))
(/noshow "entering second DEFTRANSFORM ALIEN-FUNCALL" function)
(let ((alien-type (alien-type-type-alien-type type)))
(unless (alien-function-type-p alien-type)
(give-up-ir1-transform))
(let ((arg-types (alien-function-type-arg-types alien-type)))
(unless (= (length args) (length arg-types))
(abort-ir1-transform
"wrong number of arguments; expected ~D, got ~D"
(length arg-types)
(length args)))
(collect ((params) (deports))
(dolist (arg-type arg-types)
(let ((param (gensym)))
(params param)
(deports `(deport ,param ',arg-type))))
(let ((return-type (alien-function-type-result-type alien-type))
(body `(%alien-funcall (deport function ',alien-type)
',alien-type
,@(deports))))
(if (alien-values-type-p return-type)
(collect ((temps) (results))
(dolist (type (alien-values-type-values return-type))
(let ((temp (gensym)))
(temps temp)
(results `(naturalize ,temp ',type))))
(setf body
`(multiple-value-bind ,(temps) ,body
(values ,@(results)))))
(setf body `(naturalize ,body ',return-type)))
(/noshow "returning from DEFTRANSFORM ALIEN-FUNCALL" (params) body)
`(lambda (function ,@(params))
,body)))))))
(defoptimizer (%alien-funcall derive-type) ((function type &rest args))
(declare (ignore function args))
(unless (constant-continuation-p type)
(error "Something is broken."))
(let ((type (continuation-value type)))
(unless (alien-function-type-p type)
(error "Something is broken."))
(specifier-type
(compute-alien-rep-type
(alien-function-type-result-type type)))))
(defoptimizer (%alien-funcall ltn-annotate)
((function type &rest args) node ltn-policy)
(setf (basic-combination-info node) :funny)
(setf (node-tail-p node) nil)
(annotate-ordinary-continuation function ltn-policy)
(dolist (arg args)
(annotate-ordinary-continuation arg ltn-policy)))
(defoptimizer (%alien-funcall ir2-convert)
((function type &rest args) call block)
(let ((type (if (constant-continuation-p type)
(continuation-value type)
(error "Something is broken.")))
(cont (node-cont call))
(args args))
(multiple-value-bind (nsp stack-frame-size arg-tns result-tns)
(make-call-out-tns type)
(vop alloc-number-stack-space call block stack-frame-size nsp)
(dolist (tn arg-tns)
(let* ((arg (pop args))
(sc (tn-sc tn))
(scn (sc-number sc))
#!-x86 (temp-tn (make-representation-tn (tn-primitive-type tn)
scn))
(move-arg-vops (svref (sc-move-arg-vops sc) scn)))
(aver arg)
(unless (= (length move-arg-vops) 1)
(error "no unique move-arg-vop for moves in SC ~S" (sc-name sc)))
#!+x86 (emit-move-arg-template call
block
(first move-arg-vops)
(continuation-tn call block arg)
nsp
tn)
#!-x86 (progn
(emit-move call
block
(continuation-tn call block arg)
temp-tn)
(emit-move-arg-template call
block
(first move-arg-vops)
temp-tn
nsp
tn))))
(aver (null args))
(unless (listp result-tns)
(setf result-tns (list result-tns)))
(vop* call-out call block
((continuation-tn call block function)
(reference-tn-list arg-tns nil))
((reference-tn-list result-tns t)))
(vop dealloc-number-stack-space call block stack-frame-size)
(move-continuation-result call block result-tns cont))))