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; Term evaluator based on magic-ev-fncall
; Copyright (C) 2013 Centaur Technology
;
; Contact:
; Centaur Technology Formal Verification Group
; 7600-C N. Capital of Texas Highway, Suite 300, Austin, TX 78731, USA.
; http://www.centtech.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: Sol Swords <sswords@centtech.com>
(in-package "ACL2")
(include-book "std/util/bstar" :dir :system)
(mutual-recursion
(defun magic-ev (x alist state hard-errp aokp)
(declare (xargs :guard (and (pseudo-termp x)
(symbol-alistp alist))
:verify-guards nil
:stobjs state))
(cond ((not x) (mv nil nil))
((atom x)
(mv nil (cdr (assoc-eq x alist))))
((eq (car x) 'quote) (mv nil (cadr x)))
((consp (car x))
(b* (((mv err args)
(magic-ev-lst (cdr x) alist state hard-errp aokp))
((when err)
(mv err args))
(new-alist (pairlis$ (cadar x) args)))
(magic-ev (caddar x) new-alist state hard-errp aokp)))
((eq (car x) 'if)
(b* (((mv err test)
(magic-ev (cadr x) alist state hard-errp aokp))
((when err) (mv err test)))
(if test
(if (equal (cadr x) (caddr x))
;; OR -- don't re-evaluate the same term
(mv nil test)
(magic-ev (caddr x) alist state hard-errp aokp))
(magic-ev (cadddr x) alist state hard-errp aokp))))
(t (b* (((mv err args)
(magic-ev-lst (cdr x) alist state hard-errp aokp))
((when err)
(mv err args))
((when (programp (car x) (w state)))
(mv (msg "program mode: ~x0" (car x)) nil)))
(magic-ev-fncall (car x) args state hard-errp aokp)))))
(defun magic-ev-lst (x alist state hard-errp aokp)
(declare (xargs :guard (and (pseudo-term-listp x)
(symbol-alistp alist))
:stobjs state))
(if (endp x)
(mv nil nil)
(b* (((mv err first) (magic-ev (car x) alist state hard-errp aokp))
((when err) (mv err first))
((mv err rest) (magic-ev-lst (cdr x) alist state hard-errp aokp))
((when err) (mv err rest)))
(mv nil (cons first rest))))))
(defthm len-of-magic-ev-lst
(b* (((mv err val)
(magic-ev-lst x alist state hard-errp aokp)))
(implies (not err)
(equal (len val) (len x)))))
(defthm true-listp-magic-ev-lst
(b* (((mv err val)
(magic-ev-lst x alist state hard-errp aokp)))
(implies (not err)
(true-listp val)))
:hints (("goal" :induct (len x)
:expand ((magic-ev-lst x alist state hard-errp aokp)))))
(defthm symbol-alistp-pairlis
(implies (symbol-listp keys)
(symbol-alistp (pairlis$ keys vals))))
(verify-guards magic-ev
:hints ((and stable-under-simplificationp
'(:expand ((pseudo-termp x))))))
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