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1 (* Copyright (c) 2008, Adam Chlipala
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2 * All rights reserved.
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3 *
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4 * Redistribution and use in source and binary forms, with or without
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5 * modification, are permitted provided that the following conditions are met:
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6 *
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7 * - Redistributions of source code must retain the above copyright notice,
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8 * this list of conditions and the following disclaimer.
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9 * - Redistributions in binary form must reproduce the above copyright notice,
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10 * this list of conditions and the following disclaimer in the documentation
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11 * and/or other materials provided with the distribution.
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12 * - The names of contributors may not be used to endorse or promote products
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13 * derived from this software without specific prior written permission.
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14 *
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15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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25 * POSSIBILITY OF SUCH DAMAGE.
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26 *)
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27
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28 (* Simplify a Core program algebraically, without unfolding definitions *)
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29
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30 structure ReduceLocal :> REDUCE_LOCAL = struct
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31
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32 open Core
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33
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34 structure E = CoreEnv
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35 structure U = CoreUtil
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36
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37 val subExpInExp = E.subExpInExp
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38
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39 fun default x = x
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40
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41 fun exp (e : exp') =
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42 let
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43 (*val () = Print.prefaces "exp" [("e", CorePrint.p_exp env (e, ErrorMsg.dummySpan))]*)
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44
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45 val r = case e of
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46 EApp ((EAbs (x, t, _, e1), loc), e2) =>
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47 ((*Print.prefaces "Substitute" [("x", Print.PD.string x),
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48 ("t", CorePrint.p_con CoreEnv.empty t)];*)
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49 #1 (reduceExp (subExpInExp (0, e2) e1)))
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50
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51 | EField ((ERecord xes, _), (CName x, _), _) =>
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52 (case List.find (fn ((CName x', _), _, _) => x' = x
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53 | _ => false) xes of
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54 SOME (_, (e, _), _) => e
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55 | NONE => e)
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56
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57 | _ => e
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58 in
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59 (*Print.prefaces "exp'" [("e", CorePrint.p_exp env (e, ErrorMsg.dummySpan)),
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60 ("r", CorePrint.p_exp env (r, ErrorMsg.dummySpan))];*)
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61
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62 r
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63 end
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64
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65 and reduceExp e = U.Exp.map {kind = default, con = default, exp = exp} e
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66
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67 val reduce = U.File.map {kind = default, con = default, exp = exp, decl = default}
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68
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69 end
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