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|
(in-package "JVM")
(include-book "../M6-DJVM-shared/jvm-type-value")
(include-book "../M6-DJVM-shared/jvm-object-manipulation-primitives")
(include-book "../M6-DJVM-shared/jvm-thread")
(include-book "../M6-DJVM-shared/jvm-thread-primitives")
(include-book "../M6-DJVM-shared/jvm-linker")
(include-book "../M6-DJVM-shared/jvm-object-type-hierachy")
(include-book "../M6-DJVM-shared/jvm-monitor-primitives")
(include-book "../M6-DJVM-shared/jvm-state")
(include-book "../M6-DJVM-shared/jvm-obj")
(include-book "ordinals/e0-ordinal" :dir :system)
(set-well-founded-relation e0-ord-<)
;; primitives to manipulate exceptions
;; 1. find the appropriate exception handler
;; 2. find the error message contained in the exception.
;; Thu Apr 8 19:39:17 2004
;;
;; Only called from the JVM when current-thread is -1 which I will assert when
;; current-thread is -1, no thread is thrown!!
;;
(acl2::set-verify-guards-eagerness 2)
(defun ERROR_THROW (i s)
(declare (xargs :guard t))
;; I could assert consistent-state in consistent-state. however that is not
;; defined, yet! Thu Apr 8 19:41:49 2004. the same problem as with
;; jvm-loader One could combine guard verification with
;; consistency-perserving.
(declare (ignore i))
s)
(defun wff-exception-hander (handler)
(and (consp handler)
(true-listp handler)
(equal (car handler) 'handler)
(equal (len handler) 5)
(integerp (nth 1 handler))
(integerp (nth 2 handler))
(integerp (nth 3 handler))
(wff-type-rep (nth 4 handler))))
(defun handler-start (handler)
(declare (xargs :guard (wff-exception-hander handler)))
(nth 1 handler))
(defun handler-end (handler)
(declare (xargs :guard (wff-exception-hander handler)))
(nth 2 handler))
(defun handler-entry-point (handler)
(declare (xargs :guard (wff-exception-hander handler)))
(nth 3 handler))
;;;
;;; DJVM will check the entry point at right position in an instruction stream.
;;; need to assert this as part of consistent-state Thu Apr 8 19:55:39 2004
;;;
(defun handler-exception-type (handler)
(declare (xargs :guard (wff-exception-hander handler)))
(normalize-type-rep (nth 4 handler)))
(include-book "../M6-DJVM-shared/jvm-exceptions-guard-verification-1")
(defun correct-java-lang-String-class (s)
(and (wff-state s)
(wff-class-table (class-table s))
(wff-instance-class-table (instance-class-table s))
(equal (class-by-name "java.lang.String" (instance-class-table s))
(runtime-java-lang-String))))
;; (defthm correct-java-lang-String-class-implies-field-access-to
;; (implies (and (correct-java-lang-String-class s)
;; (bound? str-ref (heap s)))
;; (field-access-guard "java.lang.String" "value" str-ref s)))
;;;
;;; this above is not true, we really need to know the OBJECT is
;;; consistent-object.
;;;
;;; HOWEVER consistent-object has not be defined yet!!
;;;
;;;
;;; thus the guard is quite complicated
;;;
(defun JavaString-to-ACL2-str-guard (str-ref s)
(and (wff-state s)
(wff-heap (heap s))
(bound? str-ref (heap s))
(correct-java-lang-String-class s)
(field-access-guard "java.lang.String" "value" str-ref s)
(field-access-guard "java.lang.String" "offset" str-ref s)
(field-access-guard "java.lang.String" "count" str-ref s)
(mylet* ((array-ref (m6-getfield "java.lang.String" "value" str-ref s))
(array-obj (deref array-ref (heap s)))
(array-data (array-data array-obj))
(start (m6-getfield "java.lang.String" "offset" str-ref s))
(len (m6-getfield "java.lang.String" "offset" str-ref s))
(codes (sub-list array-data start len)))
(or (equal array-ref -1)
(and (bound? array-ref (heap s))
(wff-internal-array array-obj)
(integerp start)
(integerp len)
(<= 0 start)
(<= 0 len)
(< (+ start len) (array-bound array-obj))
(chars-numsp codes))))))
;; The guard is complicated but easy to establish!!
;;
;; ACL2 should be more intelliegent to figure out the minimum guard!!
(acl2::set-verify-guards-eagerness 0)
(defun JavaString-to-ACL2-str (str-ref s)
(declare (xargs :guard (JavaString-to-ACL2-str-guard str-ref s)))
(mylet* ((array-ref (m6-getfield "java.lang.String" "value" str-ref s))
(start (m6-getfield "java.lang.String" "offset" str-ref s))
(len (m6-getfield "java.lang.String" "count" str-ref s))
(array-obj (deref array-ref (heap s)))
(array-data (array-data array-obj))
(codes (sub-list array-data start len)))
(if (equal array-ref -1)
""
(make-acl2-string (code-to-chars codes)))))
(defun throw-exception2 (obj-ref s)
(prog2$ (acl2::cw "uncaught exception ~p0!~%Stop current-thread ~p1~%"
obj-ref (current-thread s))
(stopThread s)))
(defun find-handler (handlers exception-type ip-offset s)
(let ((handler (car handlers)))
(if (endp handlers)
(mv nil s)
(let* ((start (handler-start handler))
(end (handler-end handler))
(type (handler-exception-type handler))
(s1 (resolveClassReference type s))) ;; this can raise fatal error
(if (not (no-fatal-error? s1)) ;; pass the fatal error on.
(mv nil s1)
(if (or (< ip-offset start)
(> ip-offset end))
(find-handler (cdr handlers) exception-type ip-offset s)
(mv-let (assignable s2)
(isAssignableTo exception-type type s1)
(if assignable
(mv handler s2)
(find-handler (cdr handlers) exception-type ip-offset s2)))))))))
(defun getExceptionMessage (obj-ref s)
(let* ((obj (deref obj-ref s))
(specific-info (specific-info obj))
(msg-ref (specific-info-throwable-instance-message specific-info)))
msg-ref))
;--- primitives for dealing with monitors, exception handling need that. ---
;
; according to JVM spec, if monitorExit is called in an incorrect state
; the an exception need to be raised. however in KVM implementation, this is
; not the case. In MonitorExit no exception is thrown, instead a variable is
; used to record what kind of exception is thrown.
;
;---
;; it refers to many helper functions, such as obj-monitor-by-ref,
;; which is defined jvm-monitors.
;; (mv * * *)
(defun monitorExit (obj-ref s)
(let ((monitor (obj-monitor-by-ref obj-ref s)))
(if (not (equal (owner monitor) (current-thread s)))
(mv 'MonitorStatusError "IllegalMonitorStateException" s)
(let* ((new-monitor (monitor-set-depth (- (depth monitor) 1)
monitor))
(new-state (update-obj-monitor obj-ref new-monitor s)))
(if (equal (depth new-monitor) 0)
(mv 'MonitorStatusRelease nil (removeMonitorWait obj-ref new-state))
(mv 'MonitorStatusOwn nil new-state))))))
;; Mon Dec 29 15:44:53 2003
;; (defun wff-thread-strong1 (thread)
;; (and (wff-thread thread)
;; (consp (thread-call-stack thread))))
;; (defun wff-thread-table-strong1 (tt)
;; (if (endp tt)
;; t
;; (and (wff-thread-strong1 (car tt))
;; (wff-thread-table-strong1 (cdr tt)))))
(defun call-stack-depth (s)
(let ((tid (current-thread s)))
(if (equal tid -1)
1
(if (not (wff-thread-table (thread-table s)))
1
(let ((thd (thread-by-id tid (thread-table s))))
(if (not (current-thread-exists? s))
1
(let ((call-stack (thread-call-stack thd)))
(+ (len call-stack) 2))))))))
(defun locked-stage (s)
(let* ((curframe (current-frame s))
(sync-obj-ref (sync-obj-ref curframe)))
(if (equal sync-obj-ref -1)
1
2)))
(defun exception-measure (stage s)
(cons (cons (cons (call-stack-depth s) 0)
(locked-stage s))
stage))
(defthm build-java-visible-instance-data-only-change-heap
(mv-let (obj s1)
(build-a-java-visible-instance-data classnames s0)
(declare (ignore obj))
(and (equal (pc s1) (pc s0))
(equal (current-thread s1) (current-thread s0))
;; (equal (heap s1) (heap s0))
(equal (thread-table s1) (thread-table s0))
(equal (class-table s1) (class-table s0))
(equal (env s1) (env s0))
(equal (error-flag s1) (error-flag s0))
)))
(in-theory (disable env))
(defthm instantiate-only-change-heap
(mv-let (obj s1)
(instantiate classname s0)
(declare (ignore obj))
(and (equal (pc s1) (pc s0))
(equal (current-thread s1) (current-thread s0))
;; (equal (heap s1) (heap s0))
(equal (thread-table s1) (thread-table s0))
(equal (class-table s1) (class-table s0))
(equal (env s1) (env s0))
(equal (error-flag s1) (error-flag s0))
)))
(in-theory (disable instantiate))
(defthm current-thread-pushFrame0
(equal (current-thread (pushFrame0 anyFrame s))
(current-thread s)))
(defthm current-thread-popFrame
(equal (current-thread (popFrame s))
(current-thread s)))
(in-theory (disable make-thread))
(defthm wff-thread-make-thread
(wff-thread (make-thread id
saved-pc
cs
status
m-ref
mdepth
thread-ref))
:hints (("Goal" :in-theory (enable wff-thread make-thread))))
(defthm wff-thread-table-is-preserved-by-pushFrame
(implies (wff-thread-table (thread-table s))
(wff-thread-table (thread-table (pushFrame0 anyFrame s)))))
(defthm wff-thread-table-is-preserved-by-popFrame
(implies (wff-thread-table (thread-table s))
(wff-thread-table (thread-table (popFrame s)))))
(defthm wff-thread-table-thread-id
(implies (thread-by-id id tt)
(equal (thread-id (thread-by-id id tt))
id)))
(defthm thread-exists?-implies-thread-exists?
(implies (and (thread-by-id id tt)
(equal (thread-id new-thread) id))
(equal (thread-by-id id (replace-thread-table-entry (thread-by-id id tt)
new-thread tt))
new-thread)))
(defthm thread-id-thread
(implies (not thread)
(not (thread-id thread))))
;; the problem is that id could be nil!!
(defthm thread-exists?-implies-thread-exists?-2
(implies (thread-by-id id tt)
(thread-by-id id (replace-thread-table-entry
(thread-by-id id tt)
(make-thread id pc cs s m md obj) tt))))
(in-theory (enable pushFrame0 popFrame))
(defthm thread-call-stack-pushFrame
(implies (and (thread-by-id (current-thread s) (thread-table s))
(wff-thread-table (thread-table s))
(equal (current-thread s) id))
(equal (thread-call-stack
(thread-by-id id
(thread-table (pushFrame0 anyFrame s))))
(cons anyFrame (thread-call-stack (thread-by-id (current-thread s)
(thread-table s)))))))
(defthm thread-call-stack-popFrame
(implies (and (thread-by-id (current-thread s) (thread-table s))
(wff-thread-table (thread-table s))
(equal (current-thread s) id))
(equal (thread-call-stack
(thread-by-id id
(thread-table (popFrame s))))
(cdr (thread-call-stack (thread-by-id (current-thread s)
(thread-table s)))))))
(defthm thread-exists?-implies-thread-exists?-3
(implies (and (thread-by-id (current-thread s) (thread-table s))
(wff-thread-table (thread-table s))
(equal (current-thread s) id))
(thread-by-id id (thread-table
(pushFrame0 anyFrame s)))))
(defthm thread-exists?-implies-thread-exists?-4
(implies (and (thread-by-id (current-thread s) (thread-table s))
(wff-thread-table (thread-table s))
(equal (current-thread s) id))
(thread-by-id id (thread-table (popFrame s)))))
(in-theory (disable popFrame pushFrame0))
(defthm call-stack-depth-property
(let* ((tid (current-thread s))
(thd (thread-by-id tid (thread-table s)))
(cs (thread-call-stack thd)))
(and (implies (equal tid -1)
(equal (call-stack-depth s) 1))
(implies (and (not (equal tid -1))
(not (current-thread-exists? s)))
(equal (call-stack-depth s) 1))
(implies (and (not (endp cs))
(not (equal tid -1)) ;; this is really annoying
(wff-thread-table (thread-table s))
(current-thread-exists? s))
(equal (call-stack-depth (pushFrame0 anyFrame
(popFrame s)))
(call-stack-depth s)))
(implies (and (not (endp cs))
(not (equal tid -1))
(wff-thread-table (thread-table s))
(current-thread-exists? s))
(equal (call-stack-depth (popFrame s))
(- (call-stack-depth s) 1)))
(implies (and (endp cs)
(not (equal tid -1))
(wff-thread-table (thread-table s))
(current-thread-exists? s))
(equal (call-stack-depth s)
2)))))
;-----------------------
;
#| moved to jvm-loader.lisp
;; ----- start to prove load_class_only_change_class_table_error_flag_heap
|#
(in-theory (disable env))
(defthm getClass_only_change_class_table_error_flag_heap
(let ((s1 (getClass classname s0)))
(and (equal (pc s1) (pc s0))
(equal (current-thread s1) (current-thread s0))
(equal (thread-table s1) (thread-table s0))
(equal (env s1) (env s0))
))) ;; need to find the measure for admit the load_class
;; functions.
;; has free variable in it.
;; --- end of proving load_class_only_change
(in-theory (disable getClass))
;; --- start to prove find-handler does not change state ---
(in-theory (enable fatalError))
(defthm isSuperClass1-only-change-class-table-error-flag-heap
(mv-let (assignable s1)
(isSuperClass1 t1 t2 s0 seen)
(declare (ignore assignable))
(and (equal (pc s1) (pc s0))
(equal (current-thread s1) (current-thread s0))
;; (equal (heap s1) (heap s0))
(equal (thread-table s1) (thread-table s0))
;; (equal (class-table s1) (class-table s0))
(equal (env s1) (env s0))
;; (equal (error-flag s1) (error-flag s0))
)))
(in-theory (disable isSuperClass1))
;;
(defthm isAssignableTo-only-change-class-table-error-flag-heap
(mv-let (assignable s1)
(isAssignableTo t1 t2 s0)
(declare (ignore assignable))
(and (equal (pc s1) (pc s0))
(equal (current-thread s1) (current-thread s0))
;; (equal (heap s1) (heap s0))
(equal (thread-table s1) (thread-table s0))
;; (equal (class-table s1) (class-table s0))
(equal (env s1) (env s0))
;; (equal (error-flag s1) (error-flag s0))
)))
(in-theory (disable isAssignableTo))
;; --- start to prove resolveClassReference -----
(defthm load_array_class2-only-change-class-table-error-flag-heap
(let ((s1 (load_array_class2 base-type s0)))
(and (equal (pc s1) (pc s0))
(equal (current-thread s1) (current-thread s0))
;; (equal (heap s1) (heap s0))
(equal (thread-table s1) (thread-table s0))
;; (equal (class-table s1) (class-table s0))
(equal (env s1) (env s0))
;; (equal (error-flag s1) (error-flag s0))
)))
;; --- end of proving resolveClassReference ----
(in-theory (disable load_array_class2))
(defthm load_array_class-only-change-class-table-error-flag-heap
(let ((s1 (load_array_class base-type s0)))
(and (equal (pc s1) (pc s0))
(equal (current-thread s1) (current-thread s0))
;; (equal (heap s1) (heap s0))
(equal (thread-table s1) (thread-table s0))
;; (equal (class-table s1) (class-table s0))
(equal (env s1) (env s0))
;; (equal (error-flag s1) (error-flag s0))
)))
;; --- end of proving resolveClassReference ----
(in-theory (disable load_array_class))
(defthm resolveClassReference-only-change-class-table-error-flag-heap
(let ((s1 (resolveClassReference classname s0)))
(and (equal (pc s1) (pc s0))
(equal (current-thread s1) (current-thread s0))
;; (equal (heap s1) (heap s0))
(equal (thread-table s1) (thread-table s0))
;; (equal (class-table s1) (class-table s0))
(equal (env s1) (env s0))
;; (equal (error-flag s1) (error-flag s0))
)))
;; --- end of proving resolveClassReference ----
(in-theory (disable resolveClassReference))
(defthm find_handler__only_change_class_table_error_flag_heap
(mv-let (handler s1)
(find-handler handlers exception-type ip-offset s0)
(declare (ignore handler))
(and (equal (pc s1) (pc s0))
(equal (current-thread s1) (current-thread s0))
;; (equal (heap s1) (heap s0))
(equal (thread-table s1) (thread-table s0))
;; (equal (class-table s1) (class-table s0))
(equal (env s1) (env s0))
;; (equal (error-flag s1) (error-flag s0))
)))
;; has free variable in it.
;;----- end of proving find-handler does not change state
(in-theory (disable find-handler))
;;;; Mon Dec 29 23:17:03 2003 chose not to talk about current-thread-exists?
;;;; only talk about thread-by-id ....
;;;; but keep the following!!
(defthm current-thread-exists-equal-2
(let ((s1 (make-state pc (current-thread s0) hp (thread-table s0) cl env ef aux)))
(equal (current-thread-exists? s1)
(current-thread-exists? s0)))
:hints (("Goal" :in-theory (enable current-thread-exists?))))
(defthm current-thread-exists?-getClass-not-changed
(equal (current-thread-exists? (getClass classname s0))
(current-thread-exists? s0))
:hints (("Goal" :in-theory (enable current-thread-exists?))))
(defthm current-thread-exists?-find-handler-not-changed
(mv-let (handler s1)
(find-handler handlers exception-type ip-offset s0)
(declare (ignore handler))
(equal (current-thread-exists? s1)
(current-thread-exists? s0)))
:hints (("Goal" :in-theory (enable current-thread-exists?))))
(defthm call-stack-depth-exists-equal-2
(let ((s1 (make-state pc (current-thread s0) hp (thread-table s0) cl env ef aux)))
(equal (call-stack-depth s1)
(call-stack-depth s0)))
:hints (("Goal" :in-theory (enable call-stack-depth))))
(defthm call-stack-depth-getClass-not-changed
(equal (call-stack-depth (getClass classname s0))
(call-stack-depth s0))
:hints (("Goal" :in-theory (enable call-stack-depth))))
(defthm call-stack-depth-find-handler-not-changed
(mv-let (handler s1)
(find-handler handlers exception-type ip-offset s0)
(declare (ignore handler))
(equal (call-stack-depth s1)
(call-stack-depth s0)))
:hints (("Goal" :in-theory (enable call-stack-depth))))
(defthm current-frame-equal-2
(let ((s1 (make-state pc (current-thread s0) hp (thread-table s0) cl env ef aux)))
(equal (current-frame s1)
(current-frame s0))))
(defthm current-frame-getClass-not-changed
(equal (current-frame (getClass classname s0))
(current-frame s0)))
(defthm current-frame-find-handler-not-changed
(mv-let (handler s1)
(find-handler handlers exception-type ip-offset s0)
(declare (ignore handler))
(equal (current-frame s1)
(current-frame s0)))
:hints (("Goal" :in-theory (enable current-frame))))
;; this are used for talking about the sync-obj-ref
(in-theory (enable current-frame))
(defthm current-frame-pushFrame0-simplify-to
(implies (and (wff-thread-table (thread-table anyS))
(current-thread-exists? anyS))
(equal (current-frame (pushFrame0 anyFrame anyS))
anyFrame)))
(in-theory (disable current-frame))
;;----
(defthm update-obj-monitor-preserve-wff-thread-table-thread-exist-current-th
(let ((s1 (update-obj-monitor obj-ref m s0)))
(and (equal (wff-thread-table (thread-table s1))
(wff-thread-table (thread-table s0)))
(iff (current-thread-exists? s1)
(current-thread-exists? s0))
(equal (call-stack-depth s1)
(call-stack-depth s0))
(equal (consp (thread-call-stack (thread-by-id x (thread-table s1))))
(consp (thread-call-stack (thread-by-id x (thread-table s0)))))
(equal (current-thread s1)
(current-thread s0)))))
(in-theory (disable update-obj-monitor))
(defthm thread-by-id-replace-thread-table-entry-not-equal-equal
(implies (and (not (equal (thread-id old) x))
(not (equal (thread-id new) x)))
(equal (thread-by-id x
(replace-thread-table-entry old
new
tt))
(thread-by-id x tt))))
;; (defthm thread-by-id-replace-thread-table-entry-thread-exists?
;; (implies (and (not (equal (thread-id old) x))
;; (not (equal (thread-id new) x)))
;; (equal (thread-exists? x
;; (replace-thread-table-entry old
;; new
;; tt))
;; (thread-exists? x tt)))
;; :hints (("Goal" :in-theory (enable thread-exists?))))
;; (defthm current-thread-exists-replace-thread-table-entry
;; (let* ((th (current-thread s0))
;; (tt (thread-table s0))
;; (s1 (make-state pc th hp
;; (replace-thread-table-entry
;; (thread-by-id id tt)
;; (make-thread id anySavePC anyCallStack anyState
;; anyMonitorRef anyMonitorDepth
;; anyThreadRef)
;; tt)
;; cl env ef aux)))
;; (implies (and (not (equal th id))
;; (wff-thread-table-strong1 tt)
;; (thread-exists? id tt))
;; (equal (current-thread-exists? s1)
;; (current-thread-exists? s0))))
;; :hints (("Goal" :in-theory (enable current-thread-exists?))))
(defthm resume-thread-preserve-wff-thread-table-thread-exist-current-th
(let ((s1 (resumeThread id s0)))
(and (equal (wff-thread-table (thread-table s1))
(wff-thread-table (thread-table s0)))
(iff (current-thread-exists? s1)
(current-thread-exists? s0))
(equal (call-stack-depth s1)
(call-stack-depth s0))
(equal (consp (thread-call-stack (thread-by-id x (thread-table s1))))
(consp (thread-call-stack (thread-by-id x (thread-table s0)))))
(equal (current-thread s1)
(current-thread s0))))
:hints (("Goal" :cases ((equal x id)))))
(in-theory (disable resumeThread))
(in-theory (disable make-monitor dequeue-h OBJ-MONITOR-BY-REF mqueue))
(defthm removeMonitorWait-preserve-wff-thread-table-thread-exist-current-th
(let ((s1 (removeMonitorWait obj-ref s0)))
(and (equal (wff-thread-table (thread-table s1))
(wff-thread-table (thread-table s0)))
(iff (current-thread-exists? s1)
(current-thread-exists? s0))
(equal (call-stack-depth s1)
(call-stack-depth s0))
(equal (consp (thread-call-stack (thread-by-id x (thread-table s1))))
(consp (thread-call-stack (thread-by-id x (thread-table s0)))))
(equal (current-thread s1)
(current-thread s0))))
:hints (("Goal" :cases ((equal x (DEQUEUE-H (MQUEUE (OBJ-MONITOR-BY-REF OBJ-REF S0))))))))
(in-theory (disable removeMonitorWait))
(defthm monitorExit-preserve-wff-thread-table-thread-exist-current-th
(mv-let (status exception-type s1)
(monitorExit any-obj-ref s0)
(declare (ignore status exception-type))
(and (equal (wff-thread-table (thread-table s1))
(wff-thread-table (thread-table s0)))
(iff (current-thread-exists? s1)
(current-thread-exists? s0))
(equal (call-stack-depth s1)
(call-stack-depth s0))
(equal (consp (thread-call-stack (thread-by-id x (thread-table s1))))
(consp (thread-call-stack (thread-by-id x (thread-table s0)))))
(equal (current-thread s1)
(current-thread s0)))))
(in-theory (disable monitorExit))
;; (defthm wff-call-frame-make-frame
;; (wff-call-frame (make-frame rpc os lc mp sf)))
;;; not true. in the current Mon Dec 29 23:28:55 2003 wff-call-frame we also
;;; assert wff-formed method-ptr
(in-theory (disable make-frame return-pc operand-stack locals method-ptr sync-obj-ref))
(defthm sync-obj-ref-frame-set-sync
(equal (sync-obj-ref (frame-set-sync-obj-ref x frame))
x))
(in-theory (disable frame-set-sync-obj-ref))
(defthm lemma-admission
(implies (and (WFF-THREAD-TABLE (THREAD-TABLE S))
(NOT (EQUAL (current-thread s) -1))
(CURRENT-THREAD-EXISTS? S)
(CONSP (THREAD-CALL-STACK (THREAD-BY-ID (CURRENT-THREAD S)
(THREAD-TABLE S)))))
(EQUAL
(CALL-STACK-DEPTH
(PUSHFRAME0
(FRAME-SET-SYNC-OBJ-REF -1 (CURRENT-FRAME S))
(POPFRAME (MV-NTH 2
(MONITOREXIT (SYNC-OBJ-REF (CURRENT-FRAME S))
S)))))
(CALL-STACK-DEPTH S)))
:hints (("Goal" :in-theory (disable call-stack-depth))))
(defmacro m6assert (s cond msg &rest action)
`(if (not ,cond)
(fatalError ,msg ,s)
,@action))
(defmacro m6assert2 (s cond msg &rest action)
`(if (not ,cond)
(mv nil (fatalError ,msg ,s))
,@action))
(defun invariant-exception-handling-1 (s)
(and (wff-thread-table (thread-table s))
(current-thread-exists? s)
(not (equal (current-thread s) -1))
(not (endp (thread-call-stack (thread-by-id (current-thread s)
(thread-table s)))))))
(defun invariant-exception-handling-2 (s)
(and (wff-thread-table (thread-table s))
(current-thread-exists? s)
(not (equal (current-thread s) -1))))
;; however this invariant is not true when we allow unwinding across the custom
;; code.
(defun release-lock-invariant (s1 s0)
(and (equal (wff-thread-table (thread-table s1))
(wff-thread-table (thread-table s0)))
(iff (current-thread-exists? s1)
(current-thread-exists? s0))
(equal (call-stack-depth s1)
(call-stack-depth s0))
(equal (consp (thread-call-stack (thread-by-id (current-thread s1) (thread-table s1))))
(consp (thread-call-stack (thread-by-id (current-thread s0) (thread-table s0)))))
(equal (current-thread s1)
(current-thread s0))))
(in-theory (disable call-stack-depth))
(in-theory (disable method-code code-handlers instance-class-table
DEREF-METHOD current-method-ptr))
(defthm current-frame-pushFrame0-thread-exists
(implies (and (current-thread-exists? s)
(wff-thread-table (thread-table s)))
(equal (current-frame (pushFrame0 frame s))
frame))
:hints (("Goal" :in-theory (enable pushFrame0 current-frame current-thread-exists?))))
(defthm current-thread-exists?-pushFrame
(implies (and (current-thread-exists? s)
(wff-thread-table (thread-table s)))
(current-thread-exists? (pushFrame0 any s)))
:hints (("Goal" :in-theory (enable pushFrame0 current-thread-exists?))))
(defthm current-thread-exists?-popFrame
(implies (and (current-thread-exists? s)
(wff-thread-table (thread-table s)))
(current-thread-exists? (popFrame s)))
:hints (("Goal" :in-theory (enable popFrame current-thread-exists?))))
(in-theory (enable frame-set-sync-obj-ref))
(in-theory (disable current-thread-exists?))
(acl2::mutual-recursion
(defun release-lock-on-sync-obj (s)
(declare (xargs :measure (exception-measure 1 s)))
;; guard section.
(m6assert2 s (invariant-exception-handling-1 s)
"release-lock-on-sync-obj violates invariante"
(let* ((current-frame (current-frame s))
(sync-obj-ref (sync-obj-ref current-frame)))
(if (equal sync-obj-ref -1)
(mv nil s)
(mv-let (status exception-type s1)
(monitorExit sync-obj-ref s)
(if (equal status 'MonitorStatusError)
(mv t (raise-exception exception-type
(pushFrame0
(frame-set-sync-obj-ref -1 current-frame)
(popFrame s1))))
(mv nil s1)))))))
;; in cldc there is no finally block. preverify have removed the jsr
;; instruction by copying the finally block to the both normal execution path
;; and exception execution path.
(defun throw-exception1 (obj-ref s)
(declare (xargs :measure (exception-measure 2 s)))
(m6assert s (invariant-exception-handling-2 s)
"throw-exception invariant violated"
(let* ((tid (current-thread s))
(curthread (thread-by-id tid (thread-table s)))
(call-stack (thread-call-stack curthread)))
(if (endp call-stack) ;; no more call frames, uncaught exception.
(throw-exception2 obj-ref s)
(let* ((method-ptr (current-method-ptr s))
(cur-method (deref-method method-ptr
(instance-class-table s)))
(exception-type (obj-type (deref obj-ref (heap s))))
(ip-offset (pc s))
(handlers (code-handlers (method-code cur-method))))
(if (equal handlers nil)
(if (equal method-ptr (RunCustomCode-Method-ptr))
;; handle exception if exception is raised within a internal
;; function call. define a way how to propogate the exception
;; across the custom-code. (custom code may call many java
;; mehtods and the java method may raise exception and not
;; catching them.
;; trival implementation now, not clear at all to myself now.
(prog2$
(acl2::debug-print
"trying to unwind past a customcode callframe!~%Stack Trace:~p0~%~%"
(thread-call-stack (thread-by-id (current-thread s) (thread-table s))))
(fatalError "trying to unwind past a customcode --not implemented yet" s))
(mv-let (return-directly s1)
(release-lock-on-sync-obj s);; strange??
(m6assert s1 (release-lock-invariant s1 s)
"should always be true release-lock-invariant"
(if return-directly
s1
;; BEFORE we can pop frame, we need to release the monitor if necessary.
(throw-exception1 obj-ref (popFrame s1))))))
(mv-let (thehandler s1)
(find-handler handlers exception-type ip-offset s)
(prog2$ (acl2::debug-print
"exception ~p0 is thrown~% find handler ~p1 in current frame!~%"
exception-type thehandler)
(if (not (no-fatal-error? s1))
s1
(if (not (equal theHandler nil))
;; fake a frame and call exception handler.
(let* ((old-frame (current-frame s1))
(new-frame (frame-set-operand-stack
(list obj-ref)
old-frame)))
(mv-let (return-directly s2)
(release-lock-on-sync-obj s1)
(m6assert s1 (release-lock-invariant s2 s1)
"should always be true release-lock-invariant"
(if (not (no-fatal-error? s2))
s2
(if return-directly
s2
(state-set-pc (handler-entry-point theHandler)
(pushFrame0 new-frame
(popFrame s2))))))))
(mv-let (return-directly s2)
(release-lock-on-sync-obj s1)
(m6assert s1 (release-lock-invariant s2 s1)
"should always be true release-lock-invariant"
(if (not (no-fatal-error? s2))
s2
(if return-directly
s2
(throw-exception1 obj-ref
(popFrame s2))))))))))))))))
;; precondition is obj-ref is always a throwable_instance.
(defun throw-exception (obj-ref s)
(declare (xargs :measure (exception-measure 3 s)))
(let* ((current-thread (current-thread s)))
(if (equal current-thread -1)
(let ((msg-str-ref (getExceptionMessage obj-ref s)))
(if (equal msg-str-ref -1)
(ERROR_THROW -1 s)
(fatalError (JavaString-to-ACL2-str msg-str-ref s) s)))
(throw-exception1 obj-ref s)))) ;; unroll call frames and fake call frames
;; to handle exception?
;; the assumption is that "java.lang.Throwable" is loaded.
(defun raise-exception1 (classname s)
(declare (xargs :measure (exception-measure 4 s)))
(mv-let (new-addr s1)
(new-instance classname s)
(throw-exception new-addr s1)))
;;
;; in our implementation no-fatal-error? will ensure the class is loaded.
;; we will prove this property.
;; class not found will be a fatalError.
;;
(defun raise-exception (classname s)
(declare (xargs :measure (exception-measure 5 s)))
(let ((s1 (getClass classname s)))
(if (no-fatal-error? s1)
(raise-exception1 classname s1)
(alertUser
"raise-excecption: fatalError ocurred in getClass, can't find exception class indicated."
s1)))))
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