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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 ExplEnv :> EXPL_ENV = struct
open Expl
structure U = ExplUtil
structure IM = IntBinaryMap
structure SM = BinaryMapFn(struct
type ord_key = string
val compare = String.compare
end)
exception UnboundRel of int
exception UnboundNamed of int
(* AST utility functions *)
exception SynUnif
val liftConInCon =
U.Con.mapB {kind = fn k => k,
con = fn bound => fn c =>
case c of
CRel xn =>
if xn < bound then
c
else
CRel (xn + 1)
(*| CUnif _ => raise SynUnif*)
| _ => c,
bind = fn (bound, U.Con.Rel _) => bound + 1
| (bound, _) => bound}
val lift = liftConInCon 0
(* Back to environments *)
datatype 'a var' =
Rel' of int * 'a
| Named' of int * 'a
datatype 'a var =
NotBound
| Rel of int * 'a
| Named of int * 'a
type env = {
renameC : kind var' SM.map,
relC : (string * kind) list,
namedC : (string * kind * con option) IM.map,
renameE : con var' SM.map,
relE : (string * con) list,
namedE : (string * con) IM.map,
renameSgn : (int * sgn) SM.map,
sgn : (string * sgn) IM.map,
renameStr : (int * sgn) SM.map,
str : (string * sgn) IM.map
}
val namedCounter = ref 0
val empty = {
renameC = SM.empty,
relC = [],
namedC = IM.empty,
renameE = SM.empty,
relE = [],
namedE = IM.empty,
renameSgn = SM.empty,
sgn = IM.empty,
renameStr = SM.empty,
str = IM.empty
}
fun pushCRel (env : env) x k =
let
val renameC = SM.map (fn Rel' (n, k) => Rel' (n+1, k)
| x => x) (#renameC env)
in
{renameC = SM.insert (renameC, x, Rel' (0, k)),
relC = (x, k) :: #relC env,
namedC = IM.map (fn (x, k, co) => (x, k, Option.map lift co)) (#namedC env),
renameE = #renameE env,
relE = map (fn (x, c) => (x, lift c)) (#relE env),
namedE = IM.map (fn (x, c) => (x, lift c)) (#namedE env),
renameSgn = #renameSgn env,
sgn = #sgn env,
renameStr = #renameStr env,
str = #str env
}
end
fun lookupCRel (env : env) n =
(List.nth (#relC env, n))
handle Subscript => raise UnboundRel n
fun pushCNamed (env : env) x n k co =
{renameC = SM.insert (#renameC env, x, Named' (n, k)),
relC = #relC env,
namedC = IM.insert (#namedC env, n, (x, k, co)),
renameE = #renameE env,
relE = #relE env,
namedE = #namedE env,
renameSgn = #renameSgn env,
sgn = #sgn env,
renameStr = #renameStr env,
str = #str env}
fun lookupCNamed (env : env) n =
case IM.find (#namedC env, n) of
NONE => raise UnboundNamed n
| SOME x => x
fun pushERel (env : env) x t =
let
val renameE = SM.map (fn Rel' (n, t) => Rel' (n+1, t)
| x => x) (#renameE env)
in
{renameC = #renameC env,
relC = #relC env,
namedC = #namedC env,
renameE = SM.insert (renameE, x, Rel' (0, t)),
relE = (x, t) :: #relE env,
namedE = #namedE env,
renameSgn = #renameSgn env,
sgn = #sgn env,
renameStr = #renameStr env,
str = #str env}
end
fun lookupERel (env : env) n =
(List.nth (#relE env, n))
handle Subscript => raise UnboundRel n
fun pushENamed (env : env) x n t =
{renameC = #renameC env,
relC = #relC env,
namedC = #namedC env,
renameE = SM.insert (#renameE env, x, Named' (n, t)),
relE = #relE env,
namedE = IM.insert (#namedE env, n, (x, t)),
renameSgn = #renameSgn env,
sgn = #sgn env,
renameStr = #renameStr env,
str = #str env}
fun lookupENamed (env : env) n =
case IM.find (#namedE env, n) of
NONE => raise UnboundNamed n
| SOME x => x
fun pushSgnNamed (env : env) x n sgis =
{renameC = #renameC env,
relC = #relC env,
namedC = #namedC env,
renameE = #renameE env,
relE = #relE env,
namedE = #namedE env,
renameSgn = SM.insert (#renameSgn env, x, (n, sgis)),
sgn = IM.insert (#sgn env, n, (x, sgis)),
renameStr = #renameStr env,
str = #str env}
fun lookupSgnNamed (env : env) n =
case IM.find (#sgn env, n) of
NONE => raise UnboundNamed n
| SOME x => x
fun pushStrNamed (env : env) x n sgis =
{renameC = #renameC env,
relC = #relC env,
namedC = #namedC env,
renameE = #renameE env,
relE = #relE env,
namedE = #namedE env,
renameSgn = #renameSgn env,
sgn = #sgn env,
renameStr = SM.insert (#renameStr env, x, (n, sgis)),
str = IM.insert (#str env, n, (x, sgis))}
fun lookupStrNamed (env : env) n =
case IM.find (#str env, n) of
NONE => raise UnboundNamed n
| SOME x => x
fun declBinds env (d, loc) =
case d of
DCon (x, n, k, c) => pushCNamed env x n k (SOME c)
| DDatatype (x, n, xncs) =>
let
val env = pushCNamed env x n (KType, loc) NONE
in
foldl (fn ((x', n', NONE), env) => pushENamed env x' n' (CNamed n, loc)
| ((x', n', SOME t), env) => pushENamed env x' n' (TFun (t, (CNamed n, loc)), loc))
env xncs
end
| DDatatypeImp (x, n, m, ms, x', xncs) =>
let
val t = (CModProj (m, ms, x'), loc)
val env = pushCNamed env x n (KType, loc) (SOME t)
val t = (CNamed n, loc)
in
foldl (fn ((x', n', NONE), env) => pushENamed env x' n' t
| ((x', n', SOME t'), env) => pushENamed env x' n' (TFun (t', t), loc))
env xncs
end
| DVal (x, n, t, _) => pushENamed env x n t
| DValRec vis => foldl (fn ((x, n, t, _), env) => pushENamed env x n t) env vis
| DSgn (x, n, sgn) => pushSgnNamed env x n sgn
| DStr (x, n, sgn, _) => pushStrNamed env x n sgn
| DFfiStr (x, n, sgn) => pushStrNamed env x n sgn
| DExport _ => env
fun sgiBinds env (sgi, loc) =
case sgi of
SgiConAbs (x, n, k) => pushCNamed env x n k NONE
| SgiCon (x, n, k, c) => pushCNamed env x n k (SOME c)
| SgiDatatype (x, n, xncs) =>
let
val env = pushCNamed env x n (KType, loc) NONE
in
foldl (fn ((x', n', NONE), env) => pushENamed env x' n' (CNamed n, loc)
| ((x', n', SOME t), env) => pushENamed env x' n' (TFun (t, (CNamed n, loc)), loc))
env xncs
end
| SgiDatatypeImp (x, n, m1, ms, x', xncs) =>
let
val env = pushCNamed env x n (KType, loc) (SOME (CModProj (m1, ms, x'), loc))
in
foldl (fn ((x', n', NONE), env) => pushENamed env x' n' (CNamed n, loc)
| ((x', n', SOME t), env) => pushENamed env x' n' (TFun (t, (CNamed n, loc)), loc))
env xncs
end
| SgiVal (x, n, t) => pushENamed env x n t
| SgiSgn (x, n, sgn) => pushSgnNamed env x n sgn
| SgiStr (x, n, sgn) => pushStrNamed env x n sgn
end
|
