adam@1848: (* Copyright (c) 2008-2010, 2013, Adam Chlipala
adamc@23:  * All rights reserved.
adamc@23:  *
adamc@23:  * Redistribution and use in source and binary forms, with or without
adamc@23:  * modification, are permitted provided that the following conditions are met:
adamc@23:  *
adamc@23:  * - Redistributions of source code must retain the above copyright notice,
adamc@23:  *   this list of conditions and the following disclaimer.
adamc@23:  * - Redistributions in binary form must reproduce the above copyright notice,
adamc@23:  *   this list of conditions and the following disclaimer in the documentation
adamc@23:  *   and/or other materials provided with the distribution.
adamc@23:  * - The names of contributors may not be used to endorse or promote products
adamc@23:  *   derived from this software without specific prior written permission.
adamc@23:  *
adamc@23:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@23:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@23:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@23:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
adamc@23:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@23:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@23:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@23:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@23:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@23:  * POSSIBILITY OF SUCH DAMAGE.
adamc@23:  *)
adamc@23: 
adamc@23: (* Remove unused definitions from a file *)
adamc@23: 
adamc@23: structure Shake :> SHAKE = struct
adamc@23: 
adamc@1112: val sliceDb = ref false
adamc@1112: 
adamc@23: open Core
adamc@23: 
adamc@23: structure U = CoreUtil
adamc@23: 
adamc@23: structure IS = IntBinarySet
adamc@23: structure IM = IntBinaryMap
adamc@23: 
adamc@23: type free = {
adamc@23:      con : IS.set,
adamc@23:      exp : IS.set
adamc@23: }
adamc@23: 
adamc@338: val dummyt = (TRecord (CRecord ((KType, ErrorMsg.dummySpan), []), ErrorMsg.dummySpan), ErrorMsg.dummySpan)
adam@2048: val dummye = (EPrim (Prim.String (Prim.Normal, "")), ErrorMsg.dummySpan)
adamc@247: 
adamc@1060: fun tupleC cs = (CTuple cs, ErrorMsg.dummySpan)
adamc@1060: fun tupleE es = (ERecord (map (fn e => (dummyt, e, dummyt)) es), ErrorMsg.dummySpan)
adamc@1060: 
adamc@23: fun shake file =
adamc@100:     let
adamc@1060:         val usedVarsC = U.Con.fold {kind = fn (_, st) => st,
adamc@1060:                                     con = fn (c, cs) =>
adamc@1060:                                              case c of
adamc@1060:                                                  CNamed n => IS.add (cs, n)
adamc@1060:                                                | _ => cs}
adamc@1060: 
adamc@704:         val usedVars = U.Exp.fold {kind = fn (_, st) => st,
adamc@704:                                    con = fn (c, st as (es, cs)) =>
adamc@704:                                             case c of
adamc@704:                                                 CNamed n => (es, IS.add (cs, n))
adamc@704:                                               | _ => st,
adamc@704:                                    exp = fn (e, st as (es, cs)) =>
adamc@704:                                             case e of
adamc@704:                                                 ENamed n => (IS.add (es, n), cs)
adamc@704:                                               | _ => st}
adamc@704: 
adamc@1060:         val (usedE, usedC) =
adamc@248:             List.foldl
adamc@1112:                 (fn ((DExport (_, n, _), _), st as (usedE, usedC)) =>
adamc@1112:                     if !sliceDb then
adamc@1112:                         st
adamc@1112:                     else
adamc@1112:                         (IS.add (usedE, n), usedC)
adamc@1060:                   | ((DTable (_, _, c, _, pe, pc, ce, cc), _), (usedE, usedC)) =>
adamc@704:                     let
adamc@1060:                         val usedC = usedVarsC usedC c
adamc@1060:                         val usedC = usedVarsC usedC pc
adamc@1060:                         val usedC = usedVarsC usedC cc
adamc@1060: 
adamc@707:                         val (usedE, usedC) = usedVars (usedE, usedC) pe
adamc@707:                         val (usedE, usedC) = usedVars (usedE, usedC) ce
adamc@704:                     in
adamc@1060:                         (usedE, usedC)
adamc@704:                     end
adamc@1265:                   | ((DView (_, _, _, e, c), _), (usedE, usedC)) =>
adamc@1265:                     let
adamc@1265:                         val usedC = usedVarsC usedC c
adamc@1265:                     in
adamc@1265:                         usedVars (usedE, usedC) e
adamc@1265:                     end
adamc@1112:                   | ((DTask (e1, e2), _), st) =>
adamc@1112:                     if !sliceDb then
adamc@1112:                         st
adamc@1112:                     else
adamc@1112:                         usedVars (usedVars st e1) e2
adamc@1199:                   | ((DPolicy e1, _), st) =>
adamc@1199:                     if !sliceDb then
adamc@1199:                         st
adamc@1199:                     else
adamc@1199:                         usedVars st e1
adam@1294:                   | ((DOnError n, _), st as (usedE, usedC)) =>
adam@1294:                     if !sliceDb then
adam@1294:                         st
adam@1294:                     else
adam@1294:                         (IS.add (usedE, n), usedC)
adamc@1060:                   | (_, acc) => acc) (IS.empty, IS.empty) file
adamc@23: 
adamc@163:         val (cdef, edef) = foldl (fn ((DCon (_, n, _, c), _), (cdef, edef)) => (IM.insert (cdef, n, [c]), edef)
adamc@807:                                    | ((DDatatype dts, _), (cdef, edef)) =>
adamc@807:                                      (foldl (fn ((_, n, _, xncs), cdef) =>
adamc@807:                                                 IM.insert (cdef, n, List.mapPartial #3 xncs)) cdef dts, edef)
adamc@453:                                    | ((DVal (_, n, t, e, _), _), (cdef, edef)) => (cdef, IM.insert (edef, n, ([], t, e)))
adamc@125:                                    | ((DValRec vis, _), (cdef, edef)) =>
adamc@453:                                      let
adamc@453:                                          val all_ns = map (fn (_, n, _, _, _) => n) vis
adamc@453:                                      in
adamc@453:                                          (cdef, foldl (fn ((_, n, t, e, _), edef) =>
adamc@453:                                                           IM.insert (edef, n, (all_ns, t, e))) edef vis)
adamc@453:                                      end
adamc@247:                                    | ((DExport _, _), acc) => acc
adamc@1060:                                    | ((DTable (_, n, c, _, e1, c1, e2, c2), _), (cdef, edef)) =>
adamc@1060:                                      (cdef, IM.insert (edef, n, ([], tupleC [c, c1, c2], tupleE [e1, e2])))
adamc@338:                                    | ((DSequence (_, n, _), _), (cdef, edef)) =>
adamc@453:                                      (cdef, IM.insert (edef, n, ([], dummyt, dummye)))
adamc@754:                                    | ((DView (_, n, _, _, c), _), (cdef, edef)) =>
adamc@754:                                      (cdef, IM.insert (edef, n, ([], c, dummye)))
adamc@461:                                    | ((DDatabase _, _), acc) => acc
adamc@461:                                    | ((DCookie (_, n, c, _), _), (cdef, edef)) =>
adamc@718:                                      (cdef, IM.insert (edef, n, ([], c, dummye)))
adamc@720:                                    | ((DStyle (_, n, _), _), (cdef, edef)) =>
adamc@1073:                                      (cdef, IM.insert (edef, n, ([], dummyt, dummye)))
adamc@1199:                                    | ((DTask _, _), acc) => acc
adam@1294:                                    | ((DPolicy _, _), acc) => acc
adam@1294:                                    | ((DOnError _, _), acc) => acc)
adamc@100:                                  (IM.empty, IM.empty) file
adamc@23: 
adamc@100:         fun kind (_, s) = s
adamc@23: 
adamc@100:         fun con (c, s) =
adamc@100:             case c of
adamc@100:                 CNamed n =>
adamc@100:                 if IS.member (#con s, n) then
adamc@100:                     s
adamc@100:                 else
adamc@100:                     let
adamc@100:                         val s' = {con = IS.add (#con s, n),
adamc@100:                                   exp = #exp s}
adamc@100:                     in
adamc@100:                         case IM.find (cdef, n) of
adamc@100:                             NONE => s'
adamc@163:                           | SOME cs => foldl (fn (c, s') => shakeCon s' c) s' cs
adamc@100:                     end
adamc@100:               | _ => s
adamc@23: 
adamc@100:         and shakeCon s = U.Con.fold {kind = kind, con = con} s
adamc@23: 
adamc@1080:         (*val () = print "=====\nSHAKE\n=====\n"
adamc@1080:         val current = ref 0*)
adamc@1080: 
adamc@100:         fun exp (e, s) =
adamc@607:             let
adamc@607:                 fun check n =
adamc@607:                     if IS.member (#exp s, n) then
adamc@607:                         s
adamc@607:                     else
adamc@607:                         let
adamc@607:                             val s' = {exp = IS.add (#exp s, n),
adamc@607:                                       con = #con s}
adamc@607:                         in
adamc@1080:                             (*print ("Need " ^ Int.toString n ^ " <-- " ^ Int.toString (!current) ^ "\n");*)
adamc@607:                             case IM.find (edef, n) of
adamc@607:                                 NONE => s'
adamc@607:                               | SOME (ns, t, e) =>
adamc@607:                                 let
adamc@1080:                                     (*val old = !current
adamc@1080:                                     val () = current := n*)
adamc@607:                                     val s' = shakeExp (shakeCon s' t) e
adamc@607:                                 in
adamc@1080:                                     (*current := old;*)
adamc@607:                                     foldl (fn (n, s') => exp (ENamed n, s')) s' ns
adamc@607:                                 end
adamc@607:                         end
adamc@607:             in
adamc@607:                 case e of
adamc@607:                     ENamed n => check n
adam@1848:                   | EServerCall (n, _, _, _) => check n
adamc@607:                   | _ => s
adamc@607:             end
adamc@23: 
adamc@100:         and shakeExp s = U.Exp.fold {kind = kind, con = con, exp = exp} s
adamc@100: 
adamc@704:         val s = {con = usedC, exp = usedE}
adamc@109: 
adamc@704:         val s = IS.foldl (fn (n, s) =>
adamc@704:                              case IM.find (edef, n) of
adamc@704:                                  NONE => raise Fail "Shake: Couldn't find 'val'"
adamc@704:                                | SOME (ns, t, e) =>
adamc@704:                                  let
adamc@1080:                                      (*val () = current := n*)
adamc@704:                                      val s = shakeExp (shakeCon s t) e
adamc@704:                                  in
adamc@704:                                      foldl (fn (n, s) => exp (ENamed n, s)) s ns
adamc@704:                                  end) s usedE
adamc@248: 
adamc@1060:         val s = IS.foldl (fn (n, s) =>
adamc@1060:                              case IM.find (cdef, n) of
adamc@1062:                                  NONE => raise Fail ("Shake: Couldn't find 'con' " ^ Int.toString n)
adamc@1060:                                | SOME cs => foldl (fn (c, s) => shakeCon s c) s cs) s usedC
adamc@100:     in
adamc@100:         List.filter (fn (DCon (_, n, _, _), _) => IS.member (#con s, n)
adamc@807:                       | (DDatatype dts, _) => List.exists (fn (_, n, _, _) => IS.member (#con s, n)) dts
adamc@109:                       | (DVal (_, n, _, _, _), _) => IS.member (#exp s, n)
adamc@125:                       | (DValRec vis, _) => List.exists (fn (_, n, _, _, _) => IS.member (#exp s, n)) vis
adamc@1112:                       | (DExport _, _) => not (!sliceDb)
adamc@754:                       | (DView _, _) => true
adamc@754:                       | (DSequence _, _) => true
adamc@271:                       | (DTable _, _) => true
adamc@1112:                       | (DDatabase _, _) => not (!sliceDb)
adamc@1112:                       | (DCookie _, _) => not (!sliceDb)
adamc@1112:                       | (DStyle _, _) => not (!sliceDb)
adamc@1199:                       | (DTask _, _) => not (!sliceDb)
adam@1294:                       | (DPolicy _, _) => not (!sliceDb)
adam@1294:                       | (DOnError _, _) => not (!sliceDb)) file
adamc@100:     end
adamc@23: 
adamc@23: end