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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 CoreEnv :> CORE_ENV = struct
open Core
structure U = CoreUtil
structure IM = IntBinaryMap
(* AST utility functions *)
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)
| _ => c,
bind = fn (bound, U.Con.Rel _) => bound + 1
| (bound, _) => bound}
val lift = liftConInCon 0
(* Back to environments *)
exception UnboundRel of int
exception UnboundNamed of int
type env = {
relC : (string * kind) list,
namedC : (string * kind * con option) IM.map,
relE : (string * con) list,
namedE : (string * con * exp option) IM.map
}
val empty = {
relC = [],
namedC = IM.empty,
relE = [],
namedE = IM.empty
}
fun pushCRel (env : env) x k =
{relC = (x, k) :: #relC env,
namedC = IM.map (fn (x, k, co) => (x, k, Option.map lift co)) (#namedC env),
relE = map (fn (x, c) => (x, lift c)) (#relE env),
namedE = IM.map (fn (x, c, eo) => (x, lift c, eo)) (#namedE env)}
fun lookupCRel (env : env) n =
(List.nth (#relC env, n))
handle Subscript => raise UnboundRel n
fun pushCNamed (env : env) x n k co =
{relC = #relC env,
namedC = IM.insert (#namedC env, n, (x, k, co)),
relE = #relE env,
namedE = #namedE 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 =
{relC = #relC env,
namedC = #namedC env,
relE = (x, t) :: #relE env,
namedE = #namedE env}
fun lookupERel (env : env) n =
(List.nth (#relE env, n))
handle Subscript => raise UnboundRel n
fun pushENamed (env : env) x n t eo =
{relC = #relC env,
namedC = #namedC env,
relE = #relE env,
namedE = IM.insert (#namedE env, n, (x, t, eo))}
fun lookupENamed (env : env) n =
case IM.find (#namedE env, n) of
NONE => raise UnboundNamed n
| SOME x => x
fun declBinds env (d, _) =
case d of
DCon (x, n, k, c) => pushCNamed env x n k (SOME c)
| DVal (x, n, t, e) => pushENamed env x n t (SOME e)
| DPage _ => env
end
|
