adamc@482: (* Copyright (c) 2008, Adam Chlipala
adamc@482:  * All rights reserved.
adamc@482:  *
adamc@482:  * Redistribution and use in source and binary forms, with or without
adamc@482:  * modification, are permitted provided that the following conditions are met:
adamc@482:  *
adamc@482:  * - Redistributions of source code must retain the above copyright notice,
adamc@482:  *   this list of conditions and the following disclaimer.
adamc@482:  * - Redistributions in binary form must reproduce the above copyright notice,
adamc@482:  *   this list of conditions and the following disclaimer in the documentation
adamc@482:  *   and/or other materials provided with the distribution.
adamc@482:  * - The names of contributors may not be used to endorse or promote products
adamc@482:  *   derived from this software without specific prior written permission.
adamc@482:  *
adamc@482:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@482:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@482:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@482:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@482:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
adamc@482:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@482:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@482:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@482:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@482:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@482:  * POSSIBILITY OF SUCH DAMAGE.
adamc@482:  *)
adamc@482: 
adamc@482: (* Simplify a Core program algebraically, without unfolding definitions *)
adamc@482: 
adamc@482: structure ReduceLocal :> REDUCE_LOCAL = struct
adamc@482: 
adamc@482: open Core
adamc@482: 
adamc@482: structure E = CoreEnv
adamc@482: structure U = CoreUtil
adamc@482: 
adamc@482: val subExpInExp = E.subExpInExp
adamc@482: 
adamc@482: fun default x = x
adamc@482: 
adamc@482: fun exp (e : exp') =
adamc@482:     let
adamc@482:         (*val () = Print.prefaces "exp" [("e", CorePrint.p_exp env (e, ErrorMsg.dummySpan))]*)
adamc@482: 
adamc@482:         val r = case e of
adamc@482:                     EApp ((EAbs (x, t, _, e1), loc), e2) =>
adamc@482:                     ((*Print.prefaces "Substitute" [("x", Print.PD.string x),
adamc@482:                                                   ("t", CorePrint.p_con CoreEnv.empty t)];*)
adamc@482:                      #1 (reduceExp (subExpInExp (0, e2) e1)))
adamc@482: 
adamc@482:                   | EField ((ERecord xes, _), (CName x, _), _) =>
adamc@482:                     (case List.find (fn ((CName x', _), _, _) => x' = x
adamc@482:                                       | _ => false) xes of
adamc@482:                          SOME (_, (e, _), _) => e
adamc@482:                        | NONE => e)
adamc@482: 
adamc@482:                   | _ => e
adamc@482:     in
adamc@482:         (*Print.prefaces "exp'" [("e", CorePrint.p_exp env (e, ErrorMsg.dummySpan)),
adamc@482:                                ("r", CorePrint.p_exp env (r, ErrorMsg.dummySpan))];*)
adamc@482: 
adamc@482:         r
adamc@482:     end
adamc@482: 
adamc@482: and reduceExp e = U.Exp.map {kind = default, con = default, exp = exp} e
adamc@482: 
adamc@482: val reduce = U.File.map {kind = default, con = default, exp = exp, decl = default}
adamc@482: 
adamc@482: end