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; Milawa - A Reflective Theorem Prover
; Copyright (C) 2005-2009 Kookamara LLC
;
; Contact:
;
; Kookamara LLC
; 11410 Windermere Meadows
; Austin, TX 78759, USA
; http://www.kookamara.com/
;
; License: (An MIT/X11-style license)
;
; Permission is hereby granted, free of charge, to any person obtaining a
; copy of this software and associated documentation files (the "Software"),
; to deal in the Software without restriction, including without limitation
; the rights to use, copy, modify, merge, publish, distribute, sublicense,
; and/or sell copies of the Software, and to permit persons to whom the
; Software is furnished to do so, subject to the following conditions:
;
; The above copyright notice and this permission notice shall be included in
; all copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
; DEALINGS IN THE SOFTWARE.
;
; Original author: Jared Davis <jared@kookamara.com>
(in-package "ACL2")
;; It is unfortunate that we have to write this file, but ACL2 provides no nice
;; way to disable fertilization and generalization, which usually don't work
;; and are not implemented in Milawa.
;;
;; Originally I implemented a custom "defthm" hint that inserted a :do-not
;; '(generalize fertilize) into my proofs on "Goal" automatically. But this
;; does not get carried through into forcing rounds, and ACL2 does not provide
;; any kind of "All" target. So, sometimes in forcing rounds I still had
;; fertilization taking place.
;;
;; Now we just use a default hint that always disables generalization and
;; fertilization when goals are stable under simplification. This is chatty
;; but I don't have many alternatives.
(table no-fertilize-table 'fertilize-okp nil)
(table no-fertilize-table 'generalize-okp nil)
(defun no-fertilize-hint (world stable-under-simplificationp state)
(declare (xargs :mode :program :stobjs state))
(and stable-under-simplificationp
(let ((generalize-okp (cdr (assoc 'generalize-okp (table-alist 'no-fertilize-table world))))
(fertilize-okp (cdr (assoc 'fertilize-okp (table-alist 'no-fertilize-table world)))))
(cond ((and (not generalize-okp)
(not fertilize-okp))
(prog2$ (if (not (gag-mode))
(cw ";; hint: no fertilize/generalize~|")
nil)
'(:do-not '(generalize fertilize))))
((not generalize-okp)
(prog2$ (if (not (gag-mode))
(cw ";; hint: no generalize~|")
nil)
'(:do-not '(generalize))))
((not fertilize-okp)
(prog2$ (if (not (gag-mode))
(cw ";; hint: no fertilize~|")
nil)
'(:do-not '(fertilize))))
(t
nil)))))
(add-default-hints! '((no-fertilize-hint world stable-under-simplificationp state)))
(defmacro allow-generalize (flag)
(declare (xargs :guard (booleanp flag)))
`(table no-fertilize-table 'generalize-okp ,flag))
(defmacro allow-fertilize (flag)
(declare (xargs :guard (booleanp flag)))
`(table no-fertilize-table 'fertilize-okp ,flag))
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