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(* Copyright (c) 2008-2010, 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 definitions of datatypes *)
structure Specialize :> SPECIALIZE = struct
open Core
structure E = CoreEnv
structure U = CoreUtil
val liftConInCon = E.liftConInCon
val subConInCon = E.subConInCon
structure CK = struct
type ord_key = con list
val compare = Order.joinL U.Con.compare
end
structure CM = BinaryMapFn(CK)
structure IM = IntBinaryMap
type datatyp' = {
name : int,
constructors : int IM.map
}
type datatyp = {
name : string,
params : int,
constructors : (string * int * con option) list,
specializations : datatyp' CM.map
}
type state = {
count : int,
datatypes : datatyp IM.map,
constructors : int IM.map,
decls : (string * int * string list * (string * int * con option) list) list
}
fun kind (k, st) = (k, st)
val isOpen = U.Con.exists {kind = fn _ => false,
con = fn c =>
case c of
CRel _ => true
| _ => false}
fun considerSpecialization (st : state, n, args, dt : datatyp) =
let
val args = map ReduceLocal.reduceCon args
in
case CM.find (#specializations dt, args) of
SOME dt' => (#name dt', #constructors dt', st)
| NONE =>
let
(*val () = Print.prefaces "Args" [("n", Print.PD.string (Int.toString n)),
("args", Print.p_list (CorePrint.p_con CoreEnv.empty) args)]*)
val n' = #count st
val nxs = length args - 1
fun sub t = ListUtil.foldli (fn (i, arg, t) =>
subConInCon (nxs - i, arg) t) t args
val (cons, (count, cmap)) =
ListUtil.foldlMap (fn ((x, n, to), (count, cmap)) =>
let
val to = Option.map sub to
in
((x, count, to),
(count + 1,
IM.insert (cmap, n, count)))
end) (n' + 1, IM.empty) (#constructors dt)
val st = {count = count,
datatypes = IM.insert (#datatypes st, n,
{name = #name dt,
params = #params dt,
constructors = #constructors dt,
specializations = CM.insert (#specializations dt,
args,
{name = n',
constructors = cmap})}),
constructors = #constructors st,
decls = #decls st}
val (cons, st) = ListUtil.foldlMap (fn ((x, n, NONE), st) => ((x, n, NONE), st)
| ((x, n, SOME t), st) =>
let
val (t, st) = specCon st t
in
((x, n, SOME t), st)
end) st cons
val dt = (#name dt ^ "_s",
n',
[],
cons)
in
(n', cmap, {count = #count st,
datatypes = #datatypes st,
constructors = #constructors st,
decls = dt :: #decls st})
end
end
and con (c, st : state) =
let
fun findApp (c, args) =
case c of
CApp ((c', _), arg) => findApp (c', arg :: args)
| CNamed n => SOME (n, args)
| _ => NONE
in
case findApp (c, []) of
SOME (n, args as (_ :: _)) =>
if List.exists isOpen args then
(c, st)
else
(case IM.find (#datatypes st, n) of
NONE => (c, st)
| SOME dt =>
if length args <> #params dt then
(c, st)
else
let
val (n, _, st) = considerSpecialization (st, n, args, dt)
in
(CNamed n, st)
end)
| _ => (c, st)
end
and specCon st = U.Con.foldMap {kind = kind, con = con} st
fun pat (p, st) =
case #1 p of
PVar _ => (p, st)
| PPrim _ => (p, st)
| PCon (dk, PConVar pn, args as (_ :: _), po) =>
let
val (po, st) =
case po of
NONE => (NONE, st)
| SOME p =>
let
val (p, st) = pat (p, st)
in
(SOME p, st)
end
val p = (PCon (dk, PConVar pn, args, po), #2 p)
in
if List.exists isOpen args then
(p, st)
else
case IM.find (#constructors st, pn) of
NONE => (p, st)
| SOME n =>
case IM.find (#datatypes st, n) of
NONE => (p, st)
| SOME dt =>
let
val (n, cmap, st) = considerSpecialization (st, n, args, dt)
in
case IM.find (cmap, pn) of
NONE => raise Fail "Specialize: Missing datatype constructor (pat)"
| SOME pn' => ((PCon (dk, PConVar pn', [], po), #2 p), st)
end
end
| PCon (dk, pc, args, SOME p') =>
let
val (p', st) = pat (p', st)
in
((PCon (dk, pc, args, SOME p'), #2 p), st)
end
| PCon _ => (p, st)
| PRecord xps =>
let
val (xps, st) = ListUtil.foldlMap (fn ((x, p, t), st) =>
let
val (p, st) = pat (p, st)
in
((x, p, t), st)
end)
st xps
in
((PRecord xps, #2 p), st)
end
fun exp (e, st) =
case e of
ECon (dk, PConVar pn, args as (_ :: _), eo) =>
if List.exists isOpen args then
(e, st)
else
(case IM.find (#constructors st, pn) of
NONE => (e, st)
| SOME n =>
case IM.find (#datatypes st, n) of
NONE => (e, st)
| SOME dt =>
let
val (n, cmap, st) = considerSpecialization (st, n, args, dt)
in
case IM.find (cmap, pn) of
NONE => raise Fail "Specialize: Missing datatype constructor"
| SOME pn' => (ECon (dk, PConVar pn', [], eo), st)
end)
| ECase (e, pes, r) =>
let
val (pes, st) = ListUtil.foldlMap (fn ((p, e), st) =>
let
val (p, st) = pat (p, st)
in
((p, e), st)
end) st pes
in
(ECase (e, pes, r), st)
end
| _ => (e, st)
fun decl (d, st) = (d, st)
val specDecl = U.Decl.foldMap {kind = kind, con = con, exp = exp, decl = decl}
fun specialize file =
let
fun doDecl (d, st) =
let
(*val () = Print.preface ("decl:", CorePrint.p_decl CoreEnv.empty all)*)
val (d, st) = specDecl st d
in
case #1 d of
DDatatype dts =>
((case #decls st of
[] => [d]
| dts' => [(DDatatype (dts' @ dts), #2 d)]),
{count = #count st,
datatypes = foldl (fn ((x, n, xs, xnts), dts) =>
IM.insert (dts, n,
{name = x,
params = length xs,
constructors = xnts,
specializations = CM.empty}))
(#datatypes st) dts,
constructors = foldl (fn ((x, n, xs, xnts), cs) =>
foldl (fn ((_, n', _), constructors) =>
IM.insert (constructors, n', n))
cs xnts)
(#constructors st) dts,
decls = []})
| _ =>
(case #decls st of
[] => [d]
| dts => [(DDatatype dts, #2 d), d],
{count = #count st,
datatypes = #datatypes st,
constructors = #constructors st,
decls = []})
end
val (ds, _) = ListUtil.foldlMapConcat doDecl
{count = U.File.maxName file + 1,
datatypes = IM.empty,
constructors = IM.empty,
decls = []} file
in
ds
end
end
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