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(in-package "JVM")
(include-book "../M6-DJVM-shared/jvm-class-table")
(include-book "../M6-DJVM-shared/jvm-state")
(include-book "../M6-DJVM-shared/jvm-class-hierachy-aux")
(include-book "../M6-DJVM-shared/jvm-obj")
(include-book "../M6-DJVM-shared/jvm-frame-manipulation-primitives")
(acl2::set-verify-guards-eagerness 2)
;;; Still problematic!! guard verification!!
;;; Tue Jan 13 14:36:57 2004
;-------------------------------------------------
; Primitives for building an java-visible-portion
;-------------------------------------------------
;; (defun array-type? (type-sig)
;; (and (true-listp type-sig)
;; (equal (length type-sig) 2)
;; (equal (car type-sig) 'ARRAY)))
;; (defun reference-type (type)
;; (or (stringp type)
;; (array-type? type)))
;; ;; Does not handle floating point constant properly.
;; ;; ACL2 has no support for floating numbers directly.
;; (defun default-value (type)
;; (cond ((equal type 'BYTE) 0)
;; ((equal type 'SHORT) 0)
;; ((equal type 'INT) 0)
;; ((equal type 'LONG) 0)
;; ((equal type 'FLOAT) "0.0")
;; ((equal type 'DOUBLE) "0.0");
;; ((equal type 'CHAR) 0)
;; ((equal type 'BOOLEAN) nil)
;; ((array-type? type) -1)
;; ((reference-type type) -1) ;; use -1 as null pointer.
;; (t 'NOT-DEFINED)))
;;
;;; moved to jvm-type-value.lisp
(defun make-field-value-pair (field-name value)
(cons field-name value))
(defun make-immediate-field-bindings (class-name field-bindings)
(cons class-name field-bindings))
;; initialization will actually fill in default values for those
;; fields. however in build-class-fields-bindings
(defun build-class-fields-bindings (class-fields)
(declare (xargs :guard (wff-class-fields class-fields)))
(if (endp class-fields)
nil
(let* ((field (car class-fields))
(field-name (field-fieldname field))
(field-type (field-fieldtype field)))
(cons (make-field-value-pair field-name (default-value field-type))
(build-class-fields-bindings (cdr class-fields))))))
;; too much efforts in defining those guard checks!!
;; (acl2::set-verify-guards-eagerness 0)
(defun build-immediate-instance-data-guard (class-name s)
(and (wff-state s)
(wff-class-table (class-table s))
(wff-instance-class-table (instance-class-table s))
(wff-class-rep (class-by-name class-name
(instance-class-table s)))
(wff-class-fields (fields (class-by-name
class-name
(instance-class-table s))))))
(defun build-immediate-instance-data (class-name S)
(declare (xargs :guard (build-immediate-instance-data-guard class-name s)))
(let* ((dcl (instance-class-table S))
(field-bindings
(build-class-fields-bindings
(fields (class-by-name class-name dcl)))))
(mv (make-immediate-field-bindings class-name field-bindings) S)))
(defun build-a-java-visible-instance-data-guard (class-names s)
(if (not (consp class-names))
t
(and (build-immediate-instance-data-guard (car class-names) s)
(build-a-java-visible-instance-data-guard (cdr class-names) s))))
(defun build-a-java-visible-instance-data (class-names S)
(declare (xargs :guard (build-a-java-visible-instance-data-guard class-names s)))
(if (not (consp class-names))
(mv nil S)
(mv-let (immediate-instance-data new-S)
(build-immediate-instance-data (car class-names) S)
(mv-let (remaining-instance-data new-S2)
(build-a-java-visible-instance-data (cdr class-names) new-S)
(mv (cons immediate-instance-data remaining-instance-data)
new-S2)))))
(defun make-java-lang-Object-java-visible-part (s)
(mv (list (cons "java.lang.Object" nil))
s))
;------------
;; contains definition of collect-superclass-list and
;; it's termination argument.
;; assume all superclasses are loaded already.
;; forget about guard verification for now!!
;;; Tue Jan 13 17:43:11 2004
;;(acl2::set-verify-guards-eagerness 0)
;; many guard will not be verified.
;;
;; This part will be shared, thus we make it guard verify correctly!
;;; Tue Jan 13 20:09:15 2004. The guard is complicated!!
;;;; Let's first write out consistent-state, we could use that as a guard.
;(i-am-here)
(defun build-a-java-visible-instance-guard (classname S)
(and (wff-state s)
(wff-class-table (class-table s))
(wff-env (env s))
(wff-instance-class-table (instance-class-table s))
(wff-static-class-table (external-class-table s))
(equal (collect-superclass-list classname (instance-class-table s))
(collect-superclassname classname (external-class-table s)))
;; Wed Jun 23 17:58:02 2004. modified
;; need to move definition of collect-superclassname to here.
(build-a-java-visible-instance-data-guard
(collect-superclass-list classname
(instance-class-table s)) s)))
;;; Tue Jul 6 11:57:15 2004
;;; I could add a no-fatal-error assertion here.
;;; then I have to add it everywhere, which is a pain.
(defun build-a-java-visible-instance (classname S)
(declare (xargs :guard (build-a-java-visible-instance-guard classname S)))
(mylet* ((cl (instance-class-table S))
(classnames (collect-superclass-list classname cl)))
(if (equal classname "java.lang.Object")
(make-java-lang-Object-java-visible-part S)
(build-a-java-visible-instance-data classnames S))))
;;;
;;; Wed Mar 31 12:52:20 2004
(defun jvp-access-field-guard (classname fieldname obj)
(and (alistp obj)
(bound? classname obj)
(alistp (binding classname obj))
(bound? fieldname (binding classname obj))))
(defun jvp-setfield (classname fieldname value obj)
(declare (xargs :guard (jvp-access-field-guard classname fieldname obj)))
(bind classname
(bind fieldname value
(binding classname obj))
obj)) ;; about how to change the java-visible-portion.
(defun jvp-getfield (classname fieldname obj)
(declare (xargs :guard (jvp-access-field-guard classname fieldname obj)))
(binding fieldname
(binding classname obj)))
;;; Wed Mar 31 12:54:02 2004. Very weak guard!!
;;; WE can make it stronger, but it potentially will introduce changes to guard
;;; of other functions!!
;;;
;;; (acl2::set-verify-guards-eagerness 2)
(defun build-common-info (of-class)
(make-common-info 0 (new-monitor) of-class)) ;; ha code is same
(defun build-INSTANCE-specific-info ()
(make-INSTANCE-specific-info))
;; add accessor to ...
(defun build-an-instance (classname S)
(declare (xargs :guard (build-a-java-visible-instance-guard classname S)))
(mv-let (java-visible-portion new-S)
(build-a-java-visible-instance classname S)
(let ((commoninfo (build-common-info classname))
(specificinfo (build-INSTANCE-specific-info)))
(mv (make-object commoninfo specificinfo java-visible-portion) new-S))))
;; so far only deal with building one instance
(defun build-ARRAY-specific-info (the-internal-array bound)
(list 'specific-info 'ARRAY the-internal-array bound))
;; Tue Jan 6 14:15:30 2004. we seem to changed the specific info
;; representation.
(defun array-type (array-obj)
(declare (xargs :guard (wff-internal-array array-obj)))
(obj-type array-obj))
(defun array-bound (array-obj)
(declare (xargs :guard (wff-internal-array array-obj)))
(let ((array-specific-info (specific-info array-obj)))
(nth 3 array-specific-info)))
(defun array-data (array-obj)
(declare (xargs :guard (wff-internal-array array-obj)))
(let ((array-specific-info (specific-info array-obj)))
(nth 2 array-specific-info)))
(defun element-at-guard (index array-obj)
(mylet* ((bound (array-bound array-obj)))
(and (integerp index)
(wff-internal-array array-obj)
(integerp bound)
(<= 0 index)
(< index bound))))
(defun element-at (index array)
(declare (xargs :guard (element-at-guard index array)))
(nth index (array-data array)))
;; (defun element-at (index array)
;; (nth index (array-data array)))
(defun init-array (type count)
(declare (xargs :guard (and (integerp count)
(>= count 0))))
(if (zp count)
nil
(cons (default-value type) (init-array type (- count 1)))))
(defun make-array (type bound data S)
(declare (xargs :guard (and (build-a-java-visible-instance-guard
"java.lang.Object" s))))
(mv-let (java-visible-portion new-S)
(build-a-java-visible-instance "java.lang.Object" S)
(let* ((common-info (build-common-info type))
(specific-info (build-ARRAY-specific-info data bound)))
(mv (make-object common-info specific-info java-visible-portion) new-S))))
(defun set-element-at-guard (index array S)
(and (element-at-guard index array)
(build-a-java-visible-instance-guard "java.lang.Object" s)))
(defun set-element-at (index value array S)
(declare (xargs :guard (set-element-at-guard index array s)))
(make-array (array-type array)
(array-bound array)
(update-nth index value (array-data array))
S))
(defun build-an-array-instance (element-type length S)
(declare (xargs :guard (and (build-a-java-visible-instance-guard "java.lang.Object" s)
(integerp length)
(>= length 0))))
(let ((array-type (make-array-type element-type))
(array-data (init-array element-type length)))
(make-array array-type length array-data S)))
;; make a change here. don't want to introduce exception here. let's assume
;; once this is called, length is guaranteed to be correct.
;; all possible exception should be thrown before it call this function.
;; (acl2::set-verify-guards-eagerness 0)
;;
;; delayed!! fix this later. Tue Jan 13 22:08:01 2004
;; update-trace should be make guard t!!
;;
;; (defthm build-a-java-visible-instance-guard-implies-perserve-wff-state
;; (implies (and (build-a-java-visible-instance-guard "java.lang.Object" s)
;; (wff-state s))
;; (wff-state (mv-nth 1 (build-a-java-visible-instance
;; "java.lang.Object" s)))))
;; (defthm build-a-java-visible-instance-guard-implies-perserve-wff-heap
;; (implies (and (build-a-java-visible-instance-guard "java.lang.Object" s)
;; (wff-heap (heap s)))
;; (wff-heap (heap (mv-nth 1 (build-a-java-visible-instance
;; "java.lang.Object" s))))))
(defthm BUILD-A-JAVA-VISIBLE-INSTANCE-DATA-does-not-change-s
(equal (mv-nth 1 (build-a-java-visible-instance-data anylist s))
s))
(defthm build-a-java-visible-instance-does-not-change-s
(equal (mv-nth 1 (build-a-java-visible-instance any s))
s))
;; (defthm update-trace-does-not-change
;; (and (equal (thread-table (update-trace addr s))
;; (thread-table s))
;; (equal (class-table (update-trace addr s))
;; (class-table s))
;; (equal (pc (update-trace addr s))
;; (class-table s))
;;
;; Just expand update-trace into make-state !!
;;
(defthm wff-state-implies-pc-numberp
(implies (wff-state s)
(integerp (pc s)))
:hints (("Goal" :in-theory (enable wff-state pc)))
:rule-classes :forward-chaining)
;; (defthm wff-state-state-set-pc
;; (implies (integerp pc) ;;
;; (wff-state (make-state pc cid hp tt cl env ef aux)))
;; :hints (("Goal" :in-theory (e/d (make-state wff-state)))))
;;
;; Sun May 8 16:16:24 2005
(defthm wff-state-state-set-pc
(implies (integerp pc)
(wff-state (make-state pc cid hp tt cl env ef aux)))
:hints (("Goal" :in-theory (e/d (make-state wff-state)))))
;; (i-am-here) ;; Sun May 8 16:24:37 2005
(defun new-array (element-type length S)
(declare (xargs :guard (and (build-a-java-visible-instance-guard "java.lang.Object" s)
(integerp length)
(>= length 0)
(wff-state s)
(wff-heap (heap s))
(wff-thread-table (thread-table s))
(current-frame-guard s)
(wff-call-frame (current-frame s)))
:guard-hints (("Goal" :in-theory (e/d (update-trace)
(build-a-java-visible-instance
collect-superclass-list
))))))
(mv-let (the-object new-s)
(build-an-array-instance element-type length S)
(let* ((old-heap (heap new-s))
(addr (alloc old-heap))
(new-heap (bind addr the-object old-heap)))
(pushStack addr (update-trace addr (state-set-heap new-heap new-s))))))
;;; This new-array is M6 specific!!
;;;
;;; if for DJVM we need properly TAG it.
;;;
;; whenever we create a new object, we update-the trace.
;; .... M6, DJVM specific ... No. They should share the same implementation!!
(defun set-element-at-array-guard (index array-ref s)
(and (wff-state s)
(wff-heap (heap s))
(bound? array-ref (heap s))
(set-element-at-guard
index (binding array-ref (heap s)) s)))
;; (defun set-element-at-array (index value array-ref s)
;; (declare (xargs :guard (set-element-at-array-guard index array-ref s)))
;; (let* ((old-heap (heap s))
;; (old-array-obj (binding array-ref old-heap)))
;; (mv-let (new-array-obj new-s)
;; (set-element-at index value old-array-obj s)
;; (let* ((new-heap (bind array-ref new-array-obj old-heap)))
;; (state-set-heap new-heap new-s)))))
;; ;; we don't update the trace if there is only a write.
(defun set-element-at-array (index value array-ref s)
(declare (xargs :guard (set-element-at-array-guard index array-ref s)))
(let* ((old-heap (heap s))
(old-array-obj (binding array-ref old-heap)))
(mv-let (new-array-obj new-s)
(set-element-at index value old-array-obj s)
(let* ((new-heap (bind array-ref new-array-obj old-heap)))
(state-set-heap new-heap new-s)))))
;; we don't update the trace if there is only a write. ???
;;
;;;; Sat May 7 21:23:38 2005!!! potential bug.
;;;; the old-heap should be from new-s!!
;;;;
;;;; But we can prove that when set-element-at-array-guard succeeds
;;;; build-an-array-instance does not change state!!
;;;;
(defun set-array-content-guard (obj-refs array-ref s offset)
(and (integerp offset)
(if (not (consp obj-refs))
t
(and (set-element-at-array-guard offset array-ref s)
(set-array-content-guard (cdr obj-refs) array-ref
(set-element-at-array offset
(car obj-refs)
array-ref s)
(+ offset 1))))))
;; (defun set-array-content-guard (obj-refs array-ref s offset)
;; (and (integerp offset)
;; (if (not (consp obj-refs))
;; t
;; (and (set-element-at-array-guard offset array-ref s)
;; (set-array-content-guard (cdr obj-refs) array-ref
;; (set-element-at-array offset
;; (car obj-refs)
;; array-ref s)
;; (+ offset 1))))))
;;; modified to make it easier!!
(defun set-array-content1 (obj-refs array-ref s offset)
(declare (xargs :guard (set-array-content-guard obj-refs array-ref s offset)))
(if (not (consp obj-refs))
s
(set-array-content1 (cdr obj-refs) array-ref
(set-element-at-array offset (car obj-refs)
array-ref s)
(+ offset 1))))
(defun set-array-content (obj-refs array-ref s)
(declare (xargs :guard (set-array-content-guard obj-refs array-ref s 0)))
(set-array-content1 obj-refs array-ref s 0))
;; another definition will be
;; (defun multiarray-measure (counts length)
;; (if (zp length)
;; (cons (cons (+ (len counts) 1) 0) 0)
;; (cons (cons (+ (len counts) 1) 0) (+ length 1))))
;; (mutual-recursion
;; (defun make-multiarray1 (array-type counts s)
;; (declare (xargs :measure (multiarray-measure counts 0)))
;; (if (endp counts)
;; (pushStack -1 s)
;; ;; with the array-ref on the top of the stack
;; (mv-let (obj-refs s1)
;; (make-multiarray2 (array-base-type array-type)
;; (cdr counts)
;; (car counts)
;; s)
;; ;; first create all elements of the array
;; (let* ((s2 (new-array (array-base-type array-type)
;; (car counts)
;; s1))
;; (array-ref (topStack s2))
;; (s3 (set-array-content obj-refs array-ref s2)))
;; s3))))
;; (defun make-multiarray2 (array-type counts length s)
;; (declare (xargs :measure (multiarray-measure counts length)))
;; (if (zp length)
;; (mv nil s)
;; (mv-let (obj-refs new-s)
;; (make-multiarray2 array-type counts (- length 1) s)
;; (let* ((new-s2 (make-multiarray1 array-type counts new-s))
;; (obj-ref (topStack new-s2)))
;; (mv (cons obj-ref obj-refs) (popStack new-s2)))))))
;; ;; bytecode verifier would ensure the array-type is actually has more depths
;; ;; than dim, here we check the runtime data from stack to ensure there are
;; (defun multiarray-stack-non-negative (dim s)
;; (if (zp dim)
;; t
;; (if (< (topStack s) 0)
;; nil
;; (multiarray-stack-non-negative (- dim 1) (popStack s)))))
;; ;; similiar to new-array, assume exception is not thrown here.
;; (defun new-multiarray (array-type dim s)
;; (if (multiarray-stack-non-negative dim s)
;; (m6-internal-error "new-multiarray precondition violated" s)
;; (let ((counts (reverse (take dim (operand-stack (current-frame s))))))
;; (make-multiarray1 array-type counts s))))
;------------------------------------------
; Primitives for building an Generic Object
;------------------------------------------
;---------------------------------------------------------------------------
;
; Build a String before class is properly loaded. only used by Class Loader
; to create initial heap when loading the classs.
;
;----------------------------------------------------------------------------
;; 08/19/2002
;; because the special field appeared in the String also appeared as java
;; visible field in String. We treat it as a generic_object.
(defun build-STRING-specific-info ()
(make-STRING-specific-info))
(defun build-a-javaString (s)
(declare (xargs :guard (build-a-java-visible-instance-guard
"java.lang.String" s)))
(mv-let (java-visible-portion new-S)
(build-a-java-visible-instance "java.lang.String" S)
(let ((commoninfo (build-common-info "java.lang.String"))
(specificinfo (build-STRING-specific-info)))
(mv (make-object commoninfo specificinfo java-visible-portion) new-S))))
; build the heap objects that represent the classes loaded.
;
(defun build-instanceClass-info (classname)
(make-INSTANCE_CLASS-specific-info classname))
; (defun build-instanceClass-info (classname)
; (list 'INSTANCE_CLASS classname))
;; FIXED for consistent-test. 10/27/03
(defun isInstanceClass? (specificinfo)
(declare (xargs :guard (wff-specific-info specificinfo)))
(wff-instance_class-specific-info specificinfo))
(defun specific-info-classname (info)
(declare (xargs :guard (wff-INSTANCE_CLASS-specific-info info)))
(caddr info))
(defun build-java-lang-Class-java-visible-part (S)
(mv (list (cons "java.lang.Class" nil)
(cons "java.lang.Object" nil))
s))
(defun build-an-instanceClass (classname S)
(declare (xargs :guard (build-a-java-visible-instance-guard
"java.lang.Class" s)))
(mv-let (java-visible-portion new-S)
(build-java-lang-Class-java-visible-part s)
(let ((commoninfo (build-common-info "java.lang.Class"))
(specific-info (build-instanceClass-info classname)))
(mv (make-object commoninfo specific-info java-visible-portion)
new-S))))
(defun build-instanceClassArrayClass-info (type-desc)
(make-instanceclassarrayclass-info type-desc))
(defun isArrayClass? (specificinfo)
(declare (xargs :guard (wff-specific-info specificinfo)))
(wff-ARRAY-specific-info specificinfo))
;; may need to seperate the pacakage name out...
;; notice this is an instance of java.lang.Class which described an array-type.
(defun specific-info-array-desc (info)
(declare (xargs :guard (wff-specific-info info)))
(caddr info))
(defun build-instanceClassArrayClass (base-type-desc S)
(declare (xargs :guard (build-a-java-visible-instance-guard
"java.lang.Class" s)))
(mv-let (java-visible-portion new-S)
(build-java-lang-Class-java-visible-part s)
(let ((commoninfo (build-common-info "java.lang.Class"))
(specific-info (build-instanceClassArrayClass-info
(make-array-type base-type-desc))))
(mv (make-object commoninfo specific-info java-visible-portion)
new-S))))
;--------------- build a Throwable-instance -----
(defun build-throwable-specific-info (message backtrace)
(make-throwable-specific-info message backtrace))
(defun specific-info-throwable-instance-message (specific-info)
(declare (xargs :guard (wff-specific-info specific-info)))
(nth 2 specific-info))
;;;
;;; we could add stronger guard checking that classname does implement
;;; throwable interface!!
;;;
(defun isSubClassOf (c1 c2 s)
(declare (xargs :guard (and (wff-state s)
(wff-class-table (class-table s))
(wff-instance-class-table (instance-class-table s)))))
(isSubClassOf1 c1 c2 (instance-class-table s) nil))
;----------------------------------------------------------------------
(defun build-a-Throwable-instance (classname s)
(declare (xargs :guard (and (build-a-java-visible-instance-guard
classname s)
(isSubClassOf classname "java.lang.Throwable" s))))
(mv-let (java-visible-portion new-s)
(build-a-java-visible-instance classname s)
(let ((commoninfo (build-common-info classname))
(specific-info (build-throwable-specific-info -1 nil)))
(mv (make-object commoninfo specific-info java-visible-portion)
new-S))))
;;; That' is a special handing of throwable....
;;; There is a runtime specific info section ...
;
;-------------- above we defined how to build various objects -------
;
; GENERIC-OBJECT
; ARRAY
; STRING
; INSTANCE-CLASS
; ARRAY-CLASS
; THROWABLE-instance
;
;
;-------------- next we defined a unified interface face to use them ---
;; assuming both c1 has been loaded (all it's superclass has been loaded.
;; isSubClassOf1 is defined in jvm-semantics-primitives-aux.lisp
;; for the termination argument.
;;; We need to chose to redefine isSubClassOf to
;;
;; the class of classname MUST have been loaded.
;; before we can call this function.
;;
(defun instantiate (classname S)
(declare (xargs :guard (build-a-java-visible-instance-guard classname s)))
(cond ((equal classname "java.lang.String")
(build-a-javaString S))
;; classname can't be string.
;; is a Throwable class.
((isSubClassOf classname "java.lang.Throwable" s)
(build-a-Throwable-instance classname s))
(t (build-an-instance classname s))))
(defthm instantiate-wff-state
(implies (wff-state s)
(wff-state (mv-nth 1 (instantiate classname s)))))
;;; (acl2::set-verify-guards-eagerness 0)
;; temp. after we fix the definition of update-trace to make it guard T
;;; Wed Mar 31 13:09:43 2004
(defthm wff-heap-alistp
(implies (wff-heap hp)
(alistp hp))
:rule-classes :forward-chaining)
(defun new-instance (classname S)
(declare (xargs :guard (and (wff-state s)
(wff-heap (heap s))
(build-a-java-visible-instance-guard classname s))))
(mv-let (instance new-S)
(instantiate classname S)
(let* ((heap (heap new-S))
(new-addr (alloc heap))
(new-heap (bind new-addr instance heap)))
(mv new-addr (update-trace new-addr (state-set-heap new-heap s))))))
;; (acl2::set-verify-guards-eagerness 2)
;-
;;; some short hand utilities functions.
;;; something wrong!! Tue Jan 13 22:38:46 2004;; need to fix wff-specific-info
;; (acl2::set-verify-guards-eagerness 0)
(defun type-by-class-ref (class-ref s)
(declare (xargs :guard (and (wff-state s)
(wff-heap (heap s))
(bound? class-ref (heap s))
(wff-obj-strong (deref class-ref (heap s))))))
(let* ((class-obj (deref class-ref (heap s)))
(specific-info (specific-info class-obj)))
(if (isInstanceClass? specific-info)
(specific-info-classname specific-info)
(if (isArrayClass? specific-info)
(specific-info-array-desc specific-info)
nil))));; impossible
;-------------- primitives for modifying obj ----
; this is internal operation, assume all classes are already initialized.
;
;;; (acl2::set-verify-guards-eagerness 0)
;; Delay any state modification primitive Tue Jan 13 22:59:35 2004
;; Currently focusing on getting consistent-state predicate defined!
;;
(defun field-access-guard (classname fieldname obj-ref s)
(and (wff-state s)
(wff-heap (heap s))
(bound? obj-ref (heap s))
(wff-obj (binding obj-ref (heap s)))
(jvp-access-field-guard classname fieldname (java-visible-portion (binding obj-ref (heap s))))))
(defun m6-putfield (classname fieldname value obj-ref s)
(declare (xargs :guard (field-access-guard classname fieldname obj-ref s)))
(let* ((old-heap (heap s))
(old-obj (binding obj-ref old-heap))
(old-jvp (java-visible-portion old-obj))
(new-jvp (jvp-setfield classname fieldname value old-jvp))
(new-obj (make-object (common-info old-obj)
(specific-info old-obj)
new-jvp))
(new-heap (bind obj-ref new-obj old-heap)))
(state-set-heap new-heap s)))
(defun m6-getfield (classname fieldname obj-ref s)
(declare (xargs :guard (field-access-guard classname fieldname obj-ref s)))
(binding fieldname
(binding classname
(java-visible-portion (deref obj-ref (heap s))))))
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