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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.
*)
structure Cloconv :> CLOCONV = struct
structure L = Mono
structure L' = Flat
structure IS = IntBinarySet
structure U = FlatUtil
structure E = FlatEnv
open Print.PD
open Print
val liftExpInExp =
U.Exp.mapB {typ = fn t => t,
exp = fn bound => fn e =>
case e of
L'.ERel xn =>
if xn < bound then
e
else
L'.ERel (xn + 1)
| _ => e,
bind = fn (bound, U.Exp.RelE _) => bound + 1
| (bound, _) => bound}
val subExpInExp =
U.Exp.mapB {typ = fn t => t,
exp = fn (xn, rep) => fn e =>
case e of
L'.ERel xn' =>
if xn = xn' then
#1 rep
else
e
| _ => e,
bind = fn ((xn, rep), U.Exp.RelE _) => (xn+1, liftExpInExp 0 rep)
| (ctx, _) => ctx}
fun ccTyp (t, loc) =
case t of
L.TFun (t1, t2) => (L'.TFun (ccTyp t1, ccTyp t2), loc)
| L.TRecord xts => (L'.TRecord (map (fn (x, t) => (x, ccTyp t)) xts), loc)
| L.TNamed n => (L'.TNamed n, loc)
structure Ds :> sig
type t
val empty : t
val exp : t -> string * int * L'.typ * L'.exp -> t
val func : t -> string * L'.typ * L'.typ * L'.exp -> t * int
val decls : t -> L'.decl list
val enter : t -> t
val used : t * int -> t
val leave : t -> t
val listUsed : t -> int list
end = struct
type t = int * L'.decl list * IS.set
val empty = (0, [], IS.empty)
fun exp (fc, ds, vm) (v as (_, _, _, (_, loc))) = (fc, (L'.DVal v, loc) :: ds, vm)
fun func (fc, ds, vm) (x, dom, ran, e as (_, loc)) =
((fc+1, (L'.DFun (fc, x, dom, ran, e), loc) :: ds, vm), fc)
fun decls (_, ds, _) = rev ds
fun enter (fc, ds, vm) = (fc, ds, IS.map (fn n => n + 1) vm)
fun used ((fc, ds, vm), n) = (fc, ds, IS.add (vm, n))
fun leave (fc, ds, vm) = (fc, ds, IS.map (fn n => n - 1) (IS.delete (vm, 0) handle NotFound => vm))
fun listUsed (_, _, vm) = IS.listItems vm
end
fun ccExp env ((e, loc), D) =
case e of
L.EPrim p => ((L'.EPrim p, loc), D)
| L.ERel n => ((L'.ERel n, loc), Ds.used (D, n))
| L.ENamed n => ((L'.ENamed n, loc), D)
| L.EApp (e1, e2) =>
let
val (e1, D) = ccExp env (e1, D)
val (e2, D) = ccExp env (e2, D)
in
((L'.ELet ([("closure", (L'.TTop, loc), e1),
("arg", (L'.TTop, loc), liftExpInExp 0 e2),
("code", (L'.TTop, loc), (L'.EField ((L'.ERel 1, loc), "func"), loc)),
("env", (L'.TTop, loc), (L'.EField ((L'.ERel 2, loc), "env"), loc))],
(L'.EApp ((L'.ERel 1, loc),
(L'.ERecord [("env", (L'.ERel 0, loc), (L'.TTop, loc)),
("arg", (L'.ERel 2, loc), (L'.TTop, loc))], loc)), loc)), loc), D)
end
| L.EAbs (x, dom, ran, e) =>
let
val dom = ccTyp dom
val ran = ccTyp ran
val (e, D) = ccExp (E.pushERel env x dom) (e, Ds.enter D)
val ns = Ds.listUsed D
val ns = List.filter (fn n => n <> 0) ns
val D = Ds.leave D
(*val () = Print.preface ("Before", FlatPrint.p_exp FlatEnv.basis e)
val () = List.app (fn (x, t) => preface ("Bound", box [string x,
space,
string ":",
space,
FlatPrint.p_typ env t]))
(E.listERels env)
val () = List.app (fn n => preface ("Free", FlatPrint.p_exp (E.pushERel env x dom)
(L'.ERel n, loc))) ns*)
val body = foldl (fn (n, e) =>
subExpInExp (n, (L'.EField ((L'.ERel 1, loc), "fv" ^ Int.toString n), loc)) e)
e ns
(*val () = Print.preface (" After", FlatPrint.p_exp FlatEnv.basis body)*)
val body = (L'.ELet ([("env", (L'.TTop, loc), (L'.EField ((L'.ERel 0, loc), "env"), loc)),
("arg", (L'.TTop, loc), (L'.EField ((L'.ERel 1, loc), "arg"), loc))],
body), loc)
val envT = (L'.TRecord (map (fn n => ("fv" ^ Int.toString n, #2 (E.lookupERel env (n-1)))) ns), loc)
val (D, fi) = Ds.func D (x, (L'.TRecord [("env", envT), ("arg", dom)], loc), ran, body)
in
((L'.ERecord [("code", (L'.ECode fi, loc), (L'.TTop, loc)),
("env", (L'.ERecord (map (fn n => ("fv" ^ Int.toString n,
(L'.ERel (n-1), loc),
#2 (E.lookupERel env (n-1)))) ns), loc),
envT)], loc), D)
end
| L.ERecord xes =>
let
val (xes, D) = ListUtil.foldlMap (fn ((x, e, t), D) =>
let
val (e, D) = ccExp env (e, D)
in
((x, e, ccTyp t), D)
end) D xes
in
((L'.ERecord xes, loc), D)
end
| L.EField (e1, x) =>
let
val (e1, D) = ccExp env (e1, D)
in
((L'.EField (e1, x), loc), D)
end
fun ccDecl ((d, loc), D) =
case d of
L.DVal (x, n, t, e) =>
let
val t = ccTyp t
val (e, D) = ccExp E.basis (e, D)
in
Ds.exp D (x, n, t, e)
end
fun cloconv ds =
let
val D = foldl ccDecl Ds.empty ds
in
Ds.decls D
end
end
|
