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|
(* Copyright (c) 2009, 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 Rpcify :> RPCIFY = struct
open Core
structure U = CoreUtil
structure E = CoreEnv
structure IS = IntBinarySet
structure IM = IntBinaryMap
structure SS = BinarySetFn(struct
type ord_key = string
val compare = String.compare
end)
fun multiLiftExpInExp n e =
if n = 0 then
e
else
multiLiftExpInExp (n - 1) (E.liftExpInExp 0 e)
val ssBasis = SS.addList (SS.empty,
["requestHeader",
"query",
"dml",
"nextval",
"channel",
"subscribe",
"send"])
val csBasis = SS.addList (SS.empty,
["get",
"set",
"alert",
"recv",
"sleep",
"spawn"])
type state = {
cpsed : int IM.map,
cpsed_range : con IM.map,
cps_decls : (string * int * con * exp * string) list,
exported : IS.set,
export_decls : decl list,
maxName : int
}
fun frob file =
let
fun sideish (basis, ssids) e =
U.Exp.exists {kind = fn _ => false,
con = fn _ => false,
exp = fn ENamed n => IS.member (ssids, n)
| EFfi ("Basis", x) => SS.member (basis, x)
| EFfiApp ("Basis", x, _) => SS.member (basis, x)
| _ => false}
(U.Exp.map {kind = fn x => x,
con = fn x => x,
exp = fn ERecord _ => ERecord []
| x => x} e)
fun whichIds basis =
let
fun decl ((d, _), ssids) =
let
val impure = sideish (basis, ssids)
in
case d of
DVal (_, n, _, e, _) => if impure e then
IS.add (ssids, n)
else
ssids
| DValRec xes => if List.exists (fn (_, _, _, e, _) => impure e) xes then
foldl (fn ((_, n, _, _, _), ssids) => IS.add (ssids, n))
ssids xes
else
ssids
| _ => ssids
end
in
foldl decl IS.empty file
end
val ssids = whichIds ssBasis
val csids = whichIds csBasis
fun sideish' (basis, ids) extra =
sideish (basis, IM.foldli (fn (id, _, ids) => IS.add (ids, id)) ids extra)
val serverSide = sideish' (ssBasis, ssids)
val clientSide = sideish' (csBasis, csids)
val tfuncs = foldl
(fn ((d, _), tfuncs) =>
let
fun doOne ((x, n, t, e, _), tfuncs) =
let
val loc = #2 e
fun crawl (t, e, args) =
case (#1 t, #1 e) of
(CApp (_, ran), _) =>
SOME (x, rev args, ran, e)
| (TFun (arg, rest), EAbs (x, _, _, e)) =>
crawl (rest, e, (x, arg) :: args)
| (TFun (arg, rest), _) =>
crawl (rest, (EApp (e, (ERel (length args), loc)), loc), ("x", arg) :: args)
| _ => NONE
in
case crawl (t, e, []) of
NONE => tfuncs
| SOME sg => IM.insert (tfuncs, n, sg)
end
in
case d of
DVal vi => doOne (vi, tfuncs)
| DValRec vis => foldl doOne tfuncs vis
| _ => tfuncs
end)
IM.empty file
fun exp (e, st) =
let
fun getApp (e', args) =
let
val loc = #2 e'
in
case #1 e' of
ENamed n => (n, args)
| EApp (e1, e2) => getApp (e1, e2 :: args)
| _ => (ErrorMsg.errorAt loc "Mixed client/server code doesn't use a named function for server part";
(*Print.prefaces "Bad" [("e", CorePrint.p_exp CoreEnv.empty (e, ErrorMsg.dummySpan))];*)
(0, []))
end
fun newRpc (trans1, trans2, st : state) =
let
val loc = #2 trans1
val (n, args) = getApp (trans1, [])
val (exported, export_decls) =
if IS.member (#exported st, n) then
(#exported st, #export_decls st)
else
(IS.add (#exported st, n),
(DExport (Rpc, n), loc) :: #export_decls st)
val st = {cpsed = #cpsed st,
cpsed_range = #cpsed_range st,
cps_decls = #cps_decls st,
exported = exported,
export_decls = export_decls,
maxName = #maxName st}
val ran =
case IM.find (tfuncs, n) of
NONE => ((*Print.prefaces "BAD" [("e", CorePrint.p_exp CoreEnv.empty (e, loc))];*)
raise Fail ("Rpcify: Undetected transaction function " ^ Int.toString n))
| SOME (_, _, ran, _) => ran
val e' = EServerCall (n, args, trans2, ran)
in
(e', st)
end
fun newCps (t1, t2, trans1, trans2, st) =
let
val loc = #2 trans1
val (n, args) = getApp (trans1, [])
fun makeCall n' =
let
val e = (ENamed n', loc)
val e = (EApp (e, trans2), loc)
in
#1 (foldl (fn (arg, e) => (EApp (e, arg), loc)) e args)
end
in
case IM.find (#cpsed_range st, n) of
SOME kdom =>
(case args of
[] => raise Fail "Rpcify: cps'd function lacks first argument"
| ke :: args =>
let
val ke' = (EFfi ("Basis", "bind"), loc)
val ke' = (ECApp (ke', (CFfi ("Basis", "transaction"), loc)), loc)
val ke' = (ECApp (ke', kdom), loc)
val ke' = (ECApp (ke', t2), loc)
val ke' = (EApp (ke', (EFfi ("Basis", "transaction_monad"), loc)), loc)
val ke' = (EApp (ke', (EApp (E.liftExpInExp 0 ke, (ERel 0, loc)), loc)), loc)
val ke' = (EApp (ke', E.liftExpInExp 0 trans2), loc)
val ke' = (EAbs ("x", kdom,
(CApp ((CFfi ("Basis", "transaction"), loc), t2), loc),
ke'), loc)
val e' = (ENamed n, loc)
val e' = (EApp (e', ke'), loc)
val e' = foldl (fn (arg, e') => (EApp (e', arg), loc)) e' args
val (e', st) = doExp (e', st)
in
(#1 e', st)
end)
| NONE =>
case IM.find (#cpsed st, n) of
SOME n' => (makeCall n', st)
| NONE =>
let
val (name, fargs, ran, e) =
case IM.find (tfuncs, n) of
NONE => (Print.prefaces "BAD" [("e",
CorePrint.p_exp CoreEnv.empty (e, loc))];
raise Fail "Rpcify: Undetected transaction function [2]")
| SOME x => x
val n' = #maxName st
val st = {cpsed = IM.insert (#cpsed st, n, n'),
cpsed_range = IM.insert (#cpsed_range st, n', ran),
cps_decls = #cps_decls st,
exported = #exported st,
export_decls = #export_decls st,
maxName = n' + 1}
val unit = (TRecord (CRecord ((KType, loc), []), loc), loc)
val body = (EFfi ("Basis", "bind"), loc)
val body = (ECApp (body, (CFfi ("Basis", "transaction"), loc)), loc)
val body = (ECApp (body, t1), loc)
val body = (ECApp (body, unit), loc)
val body = (EApp (body, (EFfi ("Basis", "transaction_monad"), loc)), loc)
val body = (EApp (body, e), loc)
val body = (EApp (body, (ERel (length args), loc)), loc)
val bt = (CApp ((CFfi ("Basis", "transaction"), loc), unit), loc)
val (body, bt) = foldr (fn ((x, t), (body, bt)) =>
((EAbs (x, t, bt, body), loc),
(TFun (t, bt), loc)))
(body, bt) fargs
val kt = (TFun (ran, (CApp ((CFfi ("Basis", "transaction"), loc),
unit),
loc)), loc)
val body = (EAbs ("k", kt, bt, body), loc)
val bt = (TFun (kt, bt), loc)
val (body, st) = doExp (body, st)
val vi = (name ^ "_cps",
n',
bt,
body,
"")
val st = {cpsed = #cpsed st,
cpsed_range = #cpsed_range st,
cps_decls = vi :: #cps_decls st,
exported = #exported st,
export_decls = #export_decls st,
maxName = #maxName st}
in
(makeCall n', st)
end
end
fun dummyK loc =
let
val unit = (TRecord (CRecord ((KType, loc), []), loc), loc)
val k = (EFfi ("Basis", "return"), loc)
val k = (ECApp (k, (CFfi ("Basis", "transaction"), loc)), loc)
val k = (ECApp (k, unit), loc)
val k = (EApp (k, (EFfi ("Basis", "transaction_monad"), loc)), loc)
val k = (EApp (k, (ERecord [], loc)), loc)
in
(EAbs ("_", unit, unit, k), loc)
end
in
case e of
EApp (
(EApp
((EApp ((ECApp ((ECApp ((ECApp ((EFfi ("Basis", "bind"), loc), _), _), t1), _), t2), _),
(EFfi ("Basis", "transaction_monad"), _)), _),
(ECase (ed, pes, {disc, ...}), _)), _),
trans2) =>
let
val e' = (EFfi ("Basis", "bind"), loc)
val e' = (ECApp (e', (CFfi ("Basis", "transaction"), loc)), loc)
val e' = (ECApp (e', t1), loc)
val e' = (ECApp (e', t2), loc)
val e' = (EApp (e', (EFfi ("Basis", "transaction_monad"), loc)), loc)
val (pes, st) = ListUtil.foldlMap (fn ((p, e), st) =>
let
val e' = (EApp (e', e), loc)
val e' = (EApp (e',
multiLiftExpInExp (E.patBindsN p)
trans2), loc)
val (e', st) = doExp (e', st)
in
((p, e'), st)
end) st pes
in
(ECase (ed, pes, {disc = disc,
result = (CApp ((CFfi ("Basis", "transaction"), loc), t2), loc)}),
st)
end
| EApp (
(EApp
((EApp ((ECApp ((ECApp ((ECApp ((EFfi ("Basis", "bind"), loc), _), _), t1), _), t2), _),
(EFfi ("Basis", "transaction_monad"), _)), _),
(EServerCall (n, es, ke, t), _)), _),
trans2) =>
let
val e' = (EFfi ("Basis", "bind"), loc)
val e' = (ECApp (e', (CFfi ("Basis", "transaction"), loc)), loc)
val e' = (ECApp (e', t), loc)
val e' = (ECApp (e', t2), loc)
val e' = (EApp (e', (EFfi ("Basis", "transaction_monad"), loc)), loc)
val e' = (EApp (e', (EApp (E.liftExpInExp 0 ke, (ERel 0, loc)), loc)), loc)
val e' = (EApp (e', E.liftExpInExp 0 trans2), loc)
val e' = (EAbs ("x", t, t2, e'), loc)
val e' = (EServerCall (n, es, e', t), loc)
val (e', st) = doExp (e', st)
in
(#1 e', st)
end
| EApp (
(EApp
((EApp ((ECApp ((ECApp ((ECApp ((EFfi ("Basis", "bind"), loc), _), _), _), _), t3), _),
(EFfi ("Basis", "transaction_monad"), _)), _),
(EApp ((EApp
((EApp ((ECApp ((ECApp ((ECApp ((EFfi ("Basis", "bind"), _), _), _), t1), _), t2), _),
(EFfi ("Basis", "transaction_monad"), _)), _),
trans1), _), trans2), _)), _),
trans3) =>
let
val e'' = (EFfi ("Basis", "bind"), loc)
val e'' = (ECApp (e'', (CFfi ("Basis", "transaction"), loc)), loc)
val e'' = (ECApp (e'', t2), loc)
val e'' = (ECApp (e'', t3), loc)
val e'' = (EApp (e'', (EFfi ("Basis", "transaction_monad"), loc)), loc)
val e'' = (EApp (e'', (EApp (E.liftExpInExp 0 trans2, (ERel 0, loc)), loc)), loc)
val e'' = (EApp (e'', E.liftExpInExp 0 trans3), loc)
val e'' = (EAbs ("x", t1, (CApp ((CFfi ("Basis", "transaction"), loc), t3), loc), e''), loc)
val e' = (EFfi ("Basis", "bind"), loc)
val e' = (ECApp (e', (CFfi ("Basis", "transaction"), loc)), loc)
val e' = (ECApp (e', t1), loc)
val e' = (ECApp (e', t3), loc)
val e' = (EApp (e', (EFfi ("Basis", "transaction_monad"), loc)), loc)
val e' = (EApp (e', trans1), loc)
val e' = (EApp (e', e''), loc)
val (e', st) = doExp (e', st)
in
(#1 e', st)
end
| EApp (
(EApp
((EApp ((ECApp ((ECApp ((ECApp ((EFfi ("Basis", "bind"), _), _), _), _), _), _), _),
(EFfi ("Basis", "transaction_monad"), _)), _),
_), loc),
(EAbs (_, _, _, (EWrite _, _)), _)) => (e, st)
| EApp (
(EApp
((EApp ((ECApp ((ECApp ((ECApp ((EFfi ("Basis", "bind"), _), _), _), t1), _), t2), _),
(EFfi ("Basis", "transaction_monad"), _)), _),
trans1), loc),
trans2) =>
(case (serverSide (#cpsed_range st) trans1, clientSide (#cpsed_range st) trans1,
serverSide (#cpsed_range st) trans2, clientSide (#cpsed_range st) trans2) of
(true, false, _, true) => newRpc (trans1, trans2, st)
| (_, true, true, false) =>
(case #1 trans2 of
EAbs (x, dom, ran, trans2) =>
let
val (trans2, st) = newRpc (trans2, dummyK loc, st)
val trans2 = (EAbs (x, dom, ran, (trans2, loc)), loc)
val e = (EFfi ("Basis", "bind"), loc)
val e = (ECApp (e, (CFfi ("Basis", "transaction"), loc)), loc)
val e = (ECApp (e, t1), loc)
val e = (ECApp (e, t2), loc)
val e = (EApp (e, (EFfi ("Basis", "transaction_monad"), loc)), loc)
val e = (EApp (e, trans1), loc)
val e = EApp (e, trans2)
in
(e, st)
end
| _ => (e, st))
| (true, true, _, _) => newCps (t1, t2, trans1, trans2, st)
| _ => (e, st))
| ERecord xes =>
let
val loc = case xes of
[] => ErrorMsg.dummySpan
| (_, (_, loc), _) :: _ => loc
fun candidate (x, e) =
String.isPrefix "On" x
andalso serverSide (#cpsed_range st) e
andalso not (clientSide (#cpsed_range st) e)
in
if List.exists (fn ((CName x, _), e, _) => candidate (x, e)
| _ => false) xes then
let
val (xes, st) = ListUtil.foldlMap
(fn (y as (nm as (CName x, _), e, t), st) =>
if candidate (x, e) then
let
val (e, st) = newRpc (e, dummyK loc, st)
in
((nm, (e, loc), t), st)
end
else
(y, st)
| y => y)
st xes
in
(ERecord xes, st)
end
else
(e, st)
end
| _ => (e, st)
end
and doExp (e, st) = U.Exp.foldMap {kind = fn x => x,
con = fn x => x,
exp = exp} st (ReduceLocal.reduceExp e)
fun decl (d, st : state) =
let
val (d, st) = U.Decl.foldMap {kind = fn x => x,
con = fn x => x,
exp = exp,
decl = fn x => x}
st d
in
(List.revAppend (case #cps_decls st of
[] => [d]
| ds =>
case d of
(DValRec vis, loc) => [(DValRec (ds @ vis), loc)]
| (_, loc) => [d, (DValRec ds, loc)],
#export_decls st),
{cpsed = #cpsed st,
cpsed_range = #cpsed_range st,
cps_decls = [],
exported = #exported st,
export_decls = [],
maxName = #maxName st})
end
val (file, _) = ListUtil.foldlMapConcat decl
{cpsed = IM.empty,
cpsed_range = IM.empty,
cps_decls = [],
exported = IS.empty,
export_decls = [],
maxName = U.File.maxName file + 1}
file
in
file
end
end
|
