adamc@443: (* Copyright (c) 2008, Adam Chlipala
adamc@443:  * All rights reserved.
adamc@443:  *
adamc@443:  * Redistribution and use in source and binary forms, with or without
adamc@443:  * modification, are permitted provided that the following conditions are met:
adamc@443:  *
adamc@443:  * - Redistributions of source code must retain the above copyright notice,
adamc@443:  *   this list of conditions and the following disclaimer.
adamc@443:  * - Redistributions in binary form must reproduce the above copyright notice,
adamc@443:  *   this list of conditions and the following disclaimer in the documentation
adamc@443:  *   and/or other materials provided with the distribution.
adamc@443:  * - The names of contributors may not be used to endorse or promote products
adamc@443:  *   derived from this software without specific prior written permission.
adamc@443:  *
adamc@443:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@443:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@443:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@443:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@443:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
adamc@443:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@443:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@443:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@443:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@443:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@443:  * POSSIBILITY OF SUCH DAMAGE.
adamc@443:  *)
adamc@443: 
adamc@443: structure ESpecialize :> ESPECIALIZE = struct
adamc@443: 
adamc@443: open Core
adamc@443: 
adamc@443: structure E = CoreEnv
adamc@443: structure U = CoreUtil
adamc@443: 
adamc@479: type skey = exp
adamc@453: 
adamc@453: structure K = struct
adamc@479: type ord_key = exp list
adamc@479: val compare = Order.joinL U.Exp.compare
adamc@443: end
adamc@443: 
adamc@453: structure KM = BinaryMapFn(K)
adamc@443: structure IM = IntBinaryMap
adamc@482: structure IS = IntBinarySet
adamc@443: 
adamc@488: val freeVars = U.Exp.foldB {kind = fn (_, xs) => xs,
adamc@488:                             con = fn (_, _, xs) => xs,
adamc@488:                             exp = fn (bound, e, xs) =>
adamc@488:                                      case e of
adamc@488:                                          ERel x =>
adamc@488:                                          if x >= bound then
adamc@488:                                              IS.add (xs, x - bound)
adamc@488:                                          else
adamc@488:                                              xs
adamc@488:                                        | _ => xs,
adamc@488:                             bind = fn (bound, b) =>
adamc@488:                                       case b of
adamc@488:                                           U.Exp.RelE _ => bound + 1
adamc@488:                                         | _ => bound}
adamc@488:                            0 IS.empty
adamc@479: 
adamc@488: fun positionOf (v : int, ls) =
adamc@488:     let
adamc@488:         fun pof (pos, ls) =
adamc@488:             case ls of
adamc@488:                 [] => raise Fail "Defunc.positionOf"
adamc@488:               | v' :: ls' =>
adamc@488:                 if v = v' then
adamc@488:                     pos
adamc@488:                 else
adamc@488:                     pof (pos + 1, ls')
adamc@488:     in
adamc@488:         pof (0, ls)
adamc@488:     end
adamc@488: 
adamc@488: fun squish fvs =
adamc@488:     U.Exp.mapB {kind = fn k => k,
adamc@488:                 con = fn _ => fn c => c,
adamc@488:                 exp = fn bound => fn e =>
adamc@479:                                      case e of
adamc@488:                                          ERel x =>
adamc@488:                                          if x >= bound then
adamc@488:                                              ERel (positionOf (x - bound, fvs) + bound)
adamc@488:                                          else
adamc@488:                                              e
adamc@488:                                        | _ => e,
adamc@488:                 bind = fn (bound, b) =>
adamc@488:                           case b of
adamc@488:                               U.Exp.RelE _ => bound + 1
adamc@488:                             | _ => bound}
adamc@488:                0
adamc@453: 
adamc@443: type func = {
adamc@443:      name : string,
adamc@453:      args : int KM.map,
adamc@443:      body : exp,
adamc@443:      typ : con,
adamc@443:      tag : string
adamc@443: }
adamc@443: 
adamc@443: type state = {
adamc@443:      maxName : int,
adamc@443:      funcs : func IM.map,
adamc@443:      decls : (string * int * con * exp * string) list
adamc@443: }
adamc@443: 
adamc@521: fun id x = x
adamc@488: fun default (_, x, st) = (x, st)
adamc@443: 
adamc@453: fun specialize' file =
adamc@443:     let
adamc@488:         fun default' (_, fs) = fs
adamc@482: 
adamc@482:         fun actionableExp (e, fs) =
adamc@482:             case e of
adamc@482:                 ERecord xes =>
adamc@482:                 foldl (fn (((CName s, _), e, _), fs) =>
adamc@482:                           if s = "Action" orelse s = "Link" then
adamc@482:                               let
adamc@482:                                   fun findHead (e, _) =
adamc@482:                                       case e of
adamc@482:                                           ENamed n => IS.add (fs, n)
adamc@482:                                         | EApp (e, _) => findHead e
adamc@482:                                         | _ => fs
adamc@482:                               in
adamc@482:                                   findHead e
adamc@482:                               end
adamc@482:                           else
adamc@482:                               fs
adamc@482:                         | (_, fs) => fs)
adamc@482:                 fs xes
adamc@482:               | _ => fs
adamc@482: 
adamc@482:         val actionable =
adamc@488:             U.File.fold {kind = default',
adamc@488:                          con = default',
adamc@482:                          exp = actionableExp,
adamc@488:                          decl = default'}
adamc@482:             IS.empty file
adamc@482: 
adamc@488:         fun bind (env, b) =
adamc@488:             case b of
adamc@521:                 U.Decl.RelE xt => xt :: env
adamc@521:               | _ => env
adamc@488: 
adamc@488:         fun exp (env, e, st : state) =
adamc@482:             let
adamc@488:                 fun getApp e =
adamc@482:                     case e of
adamc@488:                         ENamed f => SOME (f, [])
adamc@482:                       | EApp (e1, e2) =>
adamc@488:                         (case getApp (#1 e1) of
adamc@482:                              NONE => NONE
adamc@488:                            | SOME (f, xs) => SOME (f, xs @ [e2]))
adamc@482:                       | _ => NONE
adamc@482:             in
adamc@482:                 case getApp e of
adamc@482:                     NONE => (e, st)
adamc@488:                   | SOME (f, xs) =>
adamc@485:                     case IM.find (#funcs st, f) of
adamc@485:                         NONE => (e, st)
adamc@485:                       | SOME {name, args, body, typ, tag} =>
adamc@488:                         let
adamc@488:                             val functionInside = U.Con.exists {kind = fn _ => false,
adamc@488:                                                                con = fn TFun _ => true
adamc@488:                                                                       | CFfi ("Basis", "transaction") => true
adamc@488:                                                                       | _ => false}
adamc@488:                             val loc = ErrorMsg.dummySpan
adamc@488: 
adamc@488:                             fun findSplit (xs, typ, fxs, fvs) =
adamc@488:                                 case (#1 typ, xs) of
adamc@488:                                     (TFun (dom, ran), e :: xs') =>
adamc@488:                                     if functionInside dom then
adamc@488:                                         findSplit (xs',
adamc@488:                                                    ran,
adamc@488:                                                    e :: fxs,
adamc@488:                                                    IS.union (fvs, freeVars e))
adamc@488:                                     else
adamc@488:                                         (rev fxs, xs, fvs)
adamc@488:                                   | _ => (rev fxs, xs, fvs)
adamc@488: 
adamc@488:                             val (fxs, xs, fvs) = findSplit (xs, typ, [], IS.empty)
adamc@488: 
adamc@488:                             val fxs' = map (squish (IS.listItems fvs)) fxs
adamc@488: 
adamc@488:                             fun firstRel () =
adamc@488:                                 case fxs' of
adamc@488:                                     (ERel _, _) :: _ => true
adamc@488:                                   | _ => false
adamc@488:                         in
adamc@488:                             if firstRel ()
adamc@488:                                orelse List.all (fn (ERel _, _) => true
adamc@488:                                                  | _ => false) fxs' then
adamc@488:                                 (e, st)
adamc@488:                             else
adamc@488:                                 case KM.find (args, fxs') of
adamc@488:                                     SOME f' =>
adamc@485:                                     let
adamc@488:                                         val e = (ENamed f', loc)
adamc@488:                                         val e = IS.foldr (fn (arg, e) => (EApp (e, (ERel arg, loc)), loc))
adamc@488:                                                          e fvs
adamc@488:                                         val e = foldl (fn (arg, e) => (EApp (e, arg), loc))
adamc@488:                                                       e xs
adamc@488:                                     in
adamc@488:                                         (*Print.prefaces "Brand new (reuse)"
adamc@488:                                                        [("e'", CorePrint.p_exp env e)];*)
adamc@488:                                         (#1 e, st)
adamc@488:                                     end
adamc@488:                                   | NONE =>
adamc@488:                                     let
adamc@488:                                         fun subBody (body, typ, fxs') =
adamc@488:                                             case (#1 body, #1 typ, fxs') of
adamc@488:                                                 (_, _, []) => SOME (body, typ)
adamc@488:                                               | (EAbs (_, _, _, body'), TFun (_, typ'), x :: fxs'') =>
adamc@488:                                                 let
adamc@488:                                                     val body'' = E.subExpInExp (0, x) body'
adamc@488:                                                 in
adamc@488:                                                     subBody (body'',
adamc@488:                                                              typ',
adamc@488:                                                              fxs'')
adamc@488:                                                 end
adamc@488:                                               | _ => NONE
adamc@488:                                     in
adamc@488:                                         case subBody (body, typ, fxs') of
adamc@488:                                             NONE => (e, st)
adamc@488:                                           | SOME (body', typ') =>
adamc@488:                                             let
adamc@488:                                                 val f' = #maxName st
adamc@488:                                                 val args = KM.insert (args, fxs', f')
adamc@488:                                                 val funcs = IM.insert (#funcs st, f, {name = name,
adamc@488:                                                                                       args = args,
adamc@488:                                                                                       body = body,
adamc@488:                                                                                       typ = typ,
adamc@488:                                                                                       tag = tag})
adamc@488:                                                 val st = {
adamc@488:                                                     maxName = f' + 1,
adamc@488:                                                     funcs = funcs,
adamc@488:                                                     decls = #decls st
adamc@488:                                                 }
adamc@487: 
adamc@488:                                                 (*val () = Print.prefaces "specExp"
adamc@488:                                                                         [("f", CorePrint.p_exp env (ENamed f, loc)),
adamc@488:                                                                          ("f'", CorePrint.p_exp env (ENamed f', loc)),
adamc@488:                                                                          ("xs", Print.p_list (CorePrint.p_exp env) xs),
adamc@488:                                                                          ("fxs'", Print.p_list
adamc@488:                                                                                       (CorePrint.p_exp E.empty) fxs'),
adamc@488:                                                                          ("e", CorePrint.p_exp env (e, loc))]*)
adamc@488:                                                 val (body', typ') = IS.foldl (fn (n, (body', typ')) =>
adamc@488:                                                                                  let
adamc@521:                                                                                      val (x, xt) = List.nth (env, n)
adamc@488:                                                                                  in
adamc@488:                                                                                      ((EAbs (x, xt, typ', body'),
adamc@488:                                                                                        loc),
adamc@488:                                                                                       (TFun (xt, typ'), loc))
adamc@488:                                                                                  end)
adamc@488:                                                                              (body', typ') fvs
adamc@488:                                                 val (body', st) = specExp env st body'
adamc@482: 
adamc@488:                                                 val e' = (ENamed f', loc)
adamc@488:                                                 val e' = IS.foldr (fn (arg, e) => (EApp (e, (ERel arg, loc)), loc))
adamc@488:                                                                   e' fvs
adamc@488:                                                 val e' = foldl (fn (arg, e) => (EApp (e, arg), loc))
adamc@488:                                                                e' xs
adamc@488:                                                 (*val () = Print.prefaces "Brand new"
adamc@488:                                                                         [("e'", CorePrint.p_exp env e'),
adamc@488:                                                                          ("e", CorePrint.p_exp env (e, loc)),
adamc@488:                                                                          ("body'", CorePrint.p_exp env body')]*)
adamc@488:                                             in
adamc@488:                                                 (#1 e',
adamc@488:                                                  {maxName = #maxName st,
adamc@488:                                                   funcs = #funcs st,
adamc@488:                                                   decls = (name, f', typ', body', tag) :: #decls st})
adamc@488:                                             end
adamc@485:                                     end
adamc@488:                         end
adamc@485:             end
adamc@482: 
adamc@521:         and specExp env = U.Exp.foldMapB {kind = id, con = default, exp = exp, bind = bind} env
adamc@482: 
adamc@521:         val specDecl = U.Decl.foldMapB {kind = id, con = default, exp = exp, decl = default, bind = bind}
adamc@482: 
adamc@521:         fun doDecl (d, (st : state, changed)) =
adamc@488:             let
adamc@521:                 (*val befor = Time.now ()*)
adamc@482: 
adamc@453:                 val funcs = #funcs st
adamc@453:                 val funcs = 
adamc@453:                     case #1 d of
adamc@453:                         DValRec vis =>
adamc@453:                         foldl (fn ((x, n, c, e, tag), funcs) =>
adamc@453:                                   IM.insert (funcs, n, {name = x,
adamc@453:                                                         args = KM.empty,
adamc@453:                                                         body = e,
adamc@453:                                                         typ = c,
adamc@453:                                                         tag = tag}))
adamc@453:                               funcs vis
adamc@453:                       | _ => funcs
adamc@453: 
adamc@453:                 val st = {maxName = #maxName st,
adamc@453:                           funcs = funcs,
adamc@453:                           decls = []}
adamc@453: 
adamc@482:                 (*val () = Print.prefaces "decl" [("d", CorePrint.p_decl CoreEnv.empty d)]*)
adamc@521: 
adamc@521:                 val (d', st) = specDecl [] st d
adamc@521: 
adamc@482:                 (*val () = print "/decl\n"*)
adamc@443: 
adamc@443:                 val funcs = #funcs st
adamc@443:                 val funcs =
adamc@443:                     case #1 d of
adamc@443:                         DVal (x, n, c, e as (EAbs _, _), tag) =>
adamc@443:                         IM.insert (funcs, n, {name = x,
adamc@453:                                               args = KM.empty,
adamc@443:                                               body = e,
adamc@443:                                               typ = c,
adamc@443:                                               tag = tag})
adamc@469:                       | DVal (_, n, _, (ENamed n', _), _) =>
adamc@469:                         (case IM.find (funcs, n') of
adamc@469:                              NONE => funcs
adamc@469:                            | SOME v => IM.insert (funcs, n, v))
adamc@443:                       | _ => funcs
adamc@443: 
adamc@453:                 val (changed, ds) =
adamc@443:                     case #decls st of
adamc@453:                         [] => (changed, [d'])
adamc@453:                       | vis =>
adamc@453:                         (true, case d' of
adamc@453:                                    (DValRec vis', _) => [(DValRec (vis @ vis'), ErrorMsg.dummySpan)]
adamc@453:                                  | _ => [(DValRec vis, ErrorMsg.dummySpan), d'])
adamc@443:             in
adamc@521:                 (*Print.prefaces "doDecl" [("d", CorePrint.p_decl E.empty d),
adamc@521:                                          ("t", Print.PD.string (Real.toString (Time.toReal
adamc@521:                                                                                    (Time.- (Time.now (), befor)))))];*)
adamc@521:                 (ds, ({maxName = #maxName st,
adamc@453:                        funcs = funcs,
adamc@453:                        decls = []}, changed))
adamc@443:             end
adamc@443: 
adamc@521:         val (ds, (_, changed)) = ListUtil.foldlMapConcat doDecl
adamc@521:                                                             ({maxName = U.File.maxName file + 1,
adamc@488:                                                               funcs = IM.empty,
adamc@488:                                                               decls = []},
adamc@488:                                                              false)
adamc@488:                                                             file
adamc@443:     in
adamc@453:         (changed, ds)
adamc@443:     end
adamc@443: 
adamc@453: fun specialize file =
adamc@453:     let
adamc@487:         (*val () = Print.prefaces "Intermediate" [("file", CorePrint.p_file CoreEnv.empty file)];*)
adamc@520:         (*val file = ReduceLocal.reduce file*)
adamc@453:         val (changed, file) = specialize' file
adamc@520:         (*val file = ReduceLocal.reduce file
adamc@520:         val file = CoreUntangle.untangle file
adamc@488:         val file = Shake.shake file*)
adamc@453:     in
adamc@488:         (*print "Round over\n";*)
adamc@453:         if changed then
adamc@520:             let
adamc@520:                 val file = ReduceLocal.reduce file
adamc@520:                 val file = CoreUntangle.untangle file
adamc@520:                 val file = Shake.shake file
adamc@520:             in
adamc@520:                 (*print "Again!\n";*)
adamc@520:                 specialize file
adamc@520:             end
adamc@453:         else
adamc@453:             file
adamc@453:     end
adamc@453: 
adamc@443: end