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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 Fuse :> FUSE = struct
open Mono
structure U = MonoUtil
structure IM = IntBinaryMap
fun returnsString (t, loc) =
let
fun rs (t, loc) =
case t of
TFfi ("Basis", "string") => SOME ([], (TRecord [], loc))
| TFun (dom, ran) =>
(case rs ran of
NONE => NONE
| SOME (args, ran') => SOME (dom :: args, (TFun (dom, ran'), loc)))
| _ => NONE
in
case t of
TFun (dom, ran) =>
(case rs ran of
NONE => NONE
| SOME (args, ran') => SOME (dom :: args, (TFun (dom, ran'), loc)))
| _ => NONE
end
fun fuse file =
let
fun doDecl (d as (_, loc), (funcs, maxName)) =
let
val (d, funcs, maxName) =
case #1 d of
DValRec vis =>
let
val (vis', funcs, maxName) =
foldl (fn ((x, n, t, e, s), (vis', funcs, maxName)) =>
case returnsString t of
NONE => (vis', funcs, maxName)
| SOME (args, t') =>
let
fun getBody (e, args) =
case (#1 e, args) of
(_, []) => (e, [])
| (EAbs (x, t, _, e), _ :: args) =>
let
val (body, args') = getBody (e, args)
in
(body, (x, t) :: args')
end
| _ => raise Fail "Fuse: getBody"
val (body, args) = getBody (e, args)
val body = MonoOpt.optExp (EWrite body, loc)
val (body, _) = foldr (fn ((x, dom), (body, ran)) =>
((EAbs (x, dom, ran, body), loc),
(TFun (dom, ran), loc)))
(body, (TRecord [], loc)) args
in
((x, maxName, t', body, s) :: vis',
IM.insert (funcs, n, maxName),
maxName + 1)
end)
([], funcs, maxName) vis
in
((DValRec (vis @ vis'), loc), funcs, maxName)
end
| _ => (d, funcs, maxName)
fun exp e =
case e of
EWrite e' =>
let
fun unravel (e, loc) =
case e of
ENamed n =>
(case IM.find (funcs, n) of
NONE => NONE
| SOME n' => SOME (ENamed n', loc))
| EApp (e1, e2) =>
(case unravel e1 of
NONE => NONE
| SOME e1 => SOME (EApp (e1, e2), loc))
| _ => NONE
in
case unravel e' of
NONE => e
| SOME (e', _) => e'
end
| _ => e
in
(U.Decl.map {typ = fn x => x,
exp = exp,
decl = fn x => x}
d,
(funcs, maxName))
end
val (file, _) = ListUtil.foldlMap doDecl (IM.empty, U.File.maxName file + 1) file
in
file
end
end
|
