/usr/share/acl2-7.2dfsg/books/hacking/defcode.lisp is in acl2-books-source 7.2dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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; Modification by Matt K. after v4-3: Removed :load-compiled-file :comp, which
; was part of both include-book forms in this file, in support of provisional
; certification. Presumably the indicate books have already been compiled by
; now, anyhow.
(include-book "hacker") ;was in portcullis
(program)
(set-state-ok t)
; auxiliary stuff:
; check if something is a list of function applications
(defun acl2-hacker::defcode-code-listp (l)
(or (null l)
(and (consp l)
(consp (car l))
(not (eq 'lambda (caar l))))))
; coerce something to be a LIST of function applications
(defun acl2-hacker::defcode-ensure-code-list (c)
(if (acl2-hacker::defcode-code-listp c)
c
(list c)))
; ***********************************
; beginning of actual dangerous stuff
(defttag defcode)
(include-book "progn-bang-enh" :ttags ((defcode)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; defcode-fn
;
; this is the event code for defcode, that executes any :loop code and
; puts any :extend or :retract code into the world.
;
(progn+touchable :fns install-event
(defun defcode-fn (loop extend retract state event-form)
(let* ((loop-lst (acl2-hacker::defcode-ensure-code-list loop))
(extend-lst (acl2-hacker::defcode-ensure-code-list extend))
(retract-lst (acl2-hacker::defcode-ensure-code-list retract)))
(er-progn
(if loop-lst
(progn!-fn loop-lst nil state)
(value nil))
(if (or extend-lst retract-lst)
(let* ((event-form (or event-form
`(defcode :loop ,loop-lst
:extend ,extend-lst
:retract ,retract-lst)))
(wrld (w state))
(wrld (if extend-lst
(putprop 'extend-progn! 'global-value extend-lst wrld)
wrld))
(wrld (if retract-lst
(putprop 'retract-progn! 'global-value retract-lst wrld)
wrld)))
(install-event ':invisible
event-form
'defcode
0
nil
nil
nil
'defcode
wrld
state))
(value nil))))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; executing code on world changes
;
; these are made as permanent changes so that the rest of defcode can be
; resurrected if an old world is reinstalled.
;
; execute code in (extend-progn! global-value #) triples on world extension
(modify-raw-defun-permanent
add-trip pre-defcode-add-trip
(world-name world-key trip)
(progn
(pre-defcode-add-trip world-name world-key trip)
(when (and (eq (car trip) 'extend-progn!)
(eq (cadr trip) 'global-value))
(mv-let (erp val state)
(state-global-let*
((inhibit-output-lst
(union-eq (@ inhibit-output-lst)
(remove 'error *valid-output-names*))))
(progn!-fn (cddr trip) nil *the-live-state*))
(declare (ignore val state))
(when erp
(hard-error 'defcode
"Error returned."
nil))))))
; execute code in (retract-progn! global-value #) triples on world retraction
(modify-raw-defun-permanent
undo-trip pre-defcode-undo-trip
(world-name world-key trip)
(progn
(pre-defcode-undo-trip world-name world-key trip)
(when (and (eq (car trip) 'retract-progn!)
(eq (cadr trip) 'global-value))
(mv-let (erp val state)
(state-global-let*
((inhibit-output-lst
(union-eq (@ inhibit-output-lst)
(remove 'error *valid-output-names*))))
(progn!-fn (cddr trip) nil *the-live-state*))
(declare (ignore val state))
(when erp
(hard-error 'defcode
"Error returned."
nil))))))
; for detecting reentry into set-w
(in-raw-mode
(defvar *set-w-reentry-protect* nil))
; enforce non-reentry of set-w
(modify-raw-defun-permanent
set-w pre-defcode-set-w (flag wrld state)
(declare (special *set-w-reentry-protect*))
(if *set-w-reentry-protect*
(hard-error 'defcode
"Attempt to change world within DEFCODE code."
nil)
(let ((*set-w-reentry-protect* t))
(pre-defcode-set-w flag wrld state))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; defcode macro
(defmacro defcode (&whole event-form &key loop extend retract compile)
(let ((loop-code-lst
`((defcode-fn
',loop
',extend
',retract
state
',event-form)))
(compile-code-lst
(cond ((atom compile)
nil)
((and (consp compile)
(consp (car compile))
(not (eq 'lambda (caar compile))))
compile)
(t
(list compile)))))
(if compile-code-lst
`(progn!
(progn! :loop-only .,loop-code-lst)
(progn! :compile-only .,compile-code-lst))
`(progn! :loop-only .,loop-code-lst))))
; this copy helpful in case of world resurrection
(defcode
:extend
(in-raw-mode
(defmacro progn! (&rest r)
(let ((sym (gensym)))
`(let ((state *the-live-state*)
(,sym (f-get-global 'acl2-raw-mode-p *the-live-state*)))
(declare (ignorable state))
,@(cond ((not (consp r))
(list nil))
((eq (car r) :loop-only)
(list nil))
((eq (car r) :compile-only)
(cdr r))
((eq (car r) :state-global-bindings)
(cddr r))
(t r))
(f-put-global 'acl2-raw-mode-p ,sym state)
(value nil))))))
; **********************
; end of dangerous stuff
(defttag nil)
; end of required defcode stuff
; tests & stuff:
#|
(defttag defcode)
;(defcode :extend (defun foo (x) (1+ x))) ; should fail
(defcode :extend (cw "==> Hi!~%")
:retract (cw "==> Bye!~%")
:compile (format t "==> Yo!~%"))
(u)
(defttag nil)
(progn (defttag t)
(defcode :extend (in-raw-mode (format t "==> Hi!~%"))
:retract (in-raw-mode (format t "==> Bye!~%")))
(defttag nil))
(u)
;(defcode :extend (in-raw-mode (format t "==> Hi!~%")))
; should fail without a trust tag
(mini-proveall)
;|#
; misc:
; this was just a convenient place to put this, considering it depends
; on defcode.
; assert that a name is not bound in ACL2, nor as a raw lisp function, macro
; or variable.
(defmacro assert-unbound (&rest names)
`(defcode
:loop
(in-raw-mode
(dolist (name ',names)
(when (and (not (f-get-global 'ld-redefinition-action *the-live-state*))
(or (getprop name 'absolute-event-number nil
'current-acl2-world (w *the-live-state*))
(boundp name)
(fboundp name)
(macro-function name)))
(hard-error 'assert-unbound
"Already has an ACL2 or raw Lisp definition: ~x0~%"
(list (cons #\0 name))))))))
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