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(* Copyright (c) 2008, Adam Chlipala
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - The names of contributors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*)
(* Simplify a Core program by repeating polymorphic function definitions *)
structure Unpoly :> UNPOLY = struct
open Core
structure E = CoreEnv
structure U = CoreUtil
structure IS = IntBinarySet
structure IM = IntBinaryMap
(** The actual specialization *)
val liftConInCon = E.liftConInCon
val subConInCon = E.subConInCon
val liftConInExp = E.liftConInExp
val subConInExp = E.subConInExp
val isOpen = U.Con.exists {kind = fn _ => false,
con = fn c =>
case c of
CRel _ => true
| _ => false}
fun unpolyNamed (xn, rep) =
U.Exp.map {kind = fn k => k,
con = fn c => c,
exp = fn e =>
case e of
ECApp (e', _) =>
let
fun isTheOne (e, _) =
case e of
ENamed xn' => xn' = xn
| ECApp (e, _) => isTheOne e
| _ => false
in
if isTheOne e' then
rep
else
e
end
| _ => e}
type state = {
funcs : (kind list * (string * int * con * exp * string) list) IM.map,
decls : decl list,
nextName : int
}
fun kind (k, st) = (k, st)
fun con (c, st) = (c, st)
fun exp (e, st : state) =
case e of
ECApp _ =>
let
(*val () = Print.prefaces "exp" [("e", CorePrint.p_exp CoreEnv.empty (e, ErrorMsg.dummySpan))]*)
fun unravel (e, cargs) =
case e of
ECApp ((e, _), c) => unravel (e, c :: cargs)
| ENamed n => SOME (n, rev cargs)
| _ => NONE
in
case unravel (e, []) of
NONE => (e, st)
| SOME (n, cargs) =>
if List.exists isOpen cargs then
(e, st)
else
case IM.find (#funcs st, n) of
NONE => (e, st)
| SOME (ks, vis) =>
let
val (vis, nextName) = ListUtil.foldlMap
(fn ((x, n, t, e, s), nextName) =>
((x, nextName, n, t, e, s), nextName + 1))
(#nextName st) vis
fun specialize (x, n, n_old, t, e, s) =
let
fun trim (t, e, cargs) =
case (t, e, cargs) of
((TCFun (_, _, t), _),
(ECAbs (_, _, e), _),
carg :: cargs) =>
let
val t = subConInCon (length cargs, carg) t
val e = subConInExp (length cargs, carg) e
in
trim (t, e, cargs)
end
| (_, _, []) =>
let
val e = foldl (fn ((_, n, n_old, _, _, _), e) =>
unpolyNamed (n_old, ENamed n) e)
e vis
in
SOME (t, e)
end
| _ => NONE
in
(*Print.prefaces "specialize"
[("t", CorePrint.p_con CoreEnv.empty t),
("e", CorePrint.p_exp CoreEnv.empty e),
("|cargs|", Print.PD.string (Int.toString (length cargs)))];*)
Option.map (fn (t, e) => (x, n, n_old, t, e, s))
(trim (t, e, cargs))
end
val vis = List.map specialize vis
in
if List.exists (not o Option.isSome) vis orelse length cargs > length ks then
(e, st)
else
let
val vis = List.mapPartial (fn x => x) vis
val vis = map (fn (x, n, n_old, t, e, s) =>
(x ^ "_unpoly", n, n_old, t, e, s)) vis
val vis' = map (fn (x, n, _, t, e, s) =>
(x, n, t, e, s)) vis
val ks' = List.drop (ks, length cargs)
in
case List.find (fn (_, _, n_old, _, _, _) => n_old = n) vis of
NONE => raise Fail "Unpoly: Inconsistent 'val rec' record"
| SOME (_, n, _, _, _, _) =>
(ENamed n,
{funcs = foldl (fn (vi, funcs) =>
IM.insert (funcs, #2 vi, (ks', vis')))
(#funcs st) vis',
decls = (DValRec vis', ErrorMsg.dummySpan) :: #decls st,
nextName = nextName})
end
end
end
| _ => (e, st)
fun decl (d, st : state) =
case d of
DValRec (vis as ((x, n, t, e, s) :: rest)) =>
let
fun unravel (e, cargs) =
case e of
(ECAbs (_, k, e), _) =>
unravel (e, k :: cargs)
| _ => rev cargs
val cargs = unravel (e, [])
fun unravel (e, cargs) =
case (e, cargs) of
((ECAbs (_, k, e), _), k' :: cargs) =>
U.Kind.compare (k, k') = EQUAL
andalso unravel (e, cargs)
| (_, []) => true
| _ => false
in
if List.exists (fn vi => not (unravel (#4 vi, cargs))) rest then
(d, st)
else
let
val ns = IS.addList (IS.empty, map #2 vis)
val nargs = length cargs
fun deAbs (e, cargs) =
case (e, cargs) of
((ECAbs (_, _, e), _), _ :: cargs) => deAbs (e, cargs)
| (_, []) => e
| _ => raise Fail "Unpoly: deAbs"
(** Verifying lack of polymorphic recursion *)
fun kind _ = false
fun con _ = false
fun exp e =
case e of
ECApp (e, c) =>
let
fun isIrregular (e, pos) =
case #1 e of
ENamed n =>
IS.member (ns, n)
andalso
(case #1 c of
CRel i => i <> nargs - pos
| _ => true)
| ECApp (e, _) => isIrregular (e, pos + 1)
| _ => false
in
isIrregular (e, 1)
end
| ECAbs _ => true
| _ => false
val irregular = U.Exp.exists {kind = kind, con = con, exp = exp}
in
if List.exists (fn x => irregular (deAbs (#4 x, cargs))) vis then
(d, st)
else
(d, {funcs = foldl (fn (vi, funcs) =>
IM.insert (funcs, #2 vi, (cargs, vis)))
(#funcs st) vis,
decls = #decls st,
nextName = #nextName st})
end
end
| _ => (d, st)
val polyDecl = U.Decl.foldMap {kind = kind, con = con, exp = exp, decl = decl}
fun unpoly file =
let
fun doDecl (d : decl, st : state) =
let
val (d, st) = polyDecl st d
in
(rev (d :: #decls st),
{funcs = #funcs st,
decls = [],
nextName = #nextName st})
end
val (ds, _) = ListUtil.foldlMapConcat doDecl
{funcs = IM.empty,
decls = [],
nextName = U.File.maxName file + 1} file
in
ds
end
end
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