adamc@16: (* Copyright (c) 2008, Adam Chlipala
adamc@16:  * All rights reserved.
adamc@16:  *
adamc@16:  * Redistribution and use in source and binary forms, with or without
adamc@16:  * modification, are permitted provided that the following conditions are met:
adamc@16:  *
adamc@16:  * - Redistributions of source code must retain the above copyright notice,
adamc@16:  *   this list of conditions and the following disclaimer.
adamc@16:  * - Redistributions in binary form must reproduce the above copyright notice,
adamc@16:  *   this list of conditions and the following disclaimer in the documentation
adamc@16:  *   and/or other materials provided with the distribution.
adamc@16:  * - The names of contributors may not be used to endorse or promote products
adamc@16:  *   derived from this software without specific prior written permission.
adamc@16:  *
adamc@16:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@16:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@16:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@16:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@16:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
adamc@16:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@16:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@16:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@16:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@16:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@16:  * POSSIBILITY OF SUCH DAMAGE.
adamc@16:  *)
adamc@16: 
adamc@16: structure CoreEnv :> CORE_ENV = struct
adamc@16: 
adamc@16: open Core
adamc@16: 
adamc@16: structure U = CoreUtil
adamc@16: 
adamc@16: structure IM = IntBinaryMap
adamc@16: 
adamc@16: 
adamc@16: (* AST utility functions *)
adamc@16: 
adamc@16: val liftConInCon =
adamc@16:     U.Con.mapB {kind = fn k => k,
adamc@16:                 con = fn bound => fn c =>
adamc@16:                                      case c of
adamc@16:                                          CRel xn =>
adamc@16:                                          if xn < bound then
adamc@16:                                              c
adamc@16:                                          else
adamc@16:                                              CRel (xn + 1)
adamc@16:                                        | _ => c,
adamc@16:                 bind = fn (bound, U.Con.Rel _) => bound + 1
adamc@16:                         | (bound, _) => bound}
adamc@16: 
adamc@16: val lift = liftConInCon 0
adamc@16: 
adamc@16: 
adamc@16: (* Back to environments *)
adamc@16: 
adamc@16: exception UnboundRel of int
adamc@16: exception UnboundNamed of int
adamc@16: 
adamc@16: type env = {
adamc@16:      relC : (string * kind) list,
adamc@16:      namedC : (string * kind * con option) IM.map,
adamc@16: 
adamc@16:      relE : (string * con) list,
adamc@20:      namedE : (string * con * exp option) IM.map
adamc@16: }
adamc@16: 
adamc@16: val empty = {
adamc@16:     relC = [],
adamc@16:     namedC = IM.empty,
adamc@16: 
adamc@16:     relE = [],
adamc@16:     namedE = IM.empty
adamc@16: }
adamc@16: 
adamc@16: fun pushCRel (env : env) x k =
adamc@16:     {relC = (x, k) :: #relC env,
adamc@16:      namedC = IM.map (fn (x, k, co) => (x, k, Option.map lift co)) (#namedC env),
adamc@16: 
adamc@16:      relE = map (fn (x, c) => (x, lift c)) (#relE env),
adamc@20:      namedE = IM.map (fn (x, c, eo) => (x, lift c, eo)) (#namedE env)}
adamc@16: 
adamc@16: fun lookupCRel (env : env) n =
adamc@16:     (List.nth (#relC env, n))
adamc@16:     handle Subscript => raise UnboundRel n
adamc@16: 
adamc@16: fun pushCNamed (env : env) x n k co =
adamc@16:     {relC = #relC env,
adamc@16:      namedC = IM.insert (#namedC env, n, (x, k, co)),
adamc@16: 
adamc@16:      relE = #relE env,
adamc@16:      namedE = #namedE env}
adamc@16: 
adamc@16: fun lookupCNamed (env : env) n =
adamc@16:     case IM.find (#namedC env, n) of
adamc@16:         NONE => raise UnboundNamed n
adamc@16:       | SOME x => x
adamc@16: 
adamc@16: fun pushERel (env : env) x t =
adamc@16:     {relC = #relC env,
adamc@16:      namedC = #namedC env,
adamc@16: 
adamc@16:      relE = (x, t) :: #relE env,
adamc@16:      namedE = #namedE env}
adamc@16: 
adamc@16: fun lookupERel (env : env) n =
adamc@16:     (List.nth (#relE env, n))
adamc@16:     handle Subscript => raise UnboundRel n
adamc@16: 
adamc@20: fun pushENamed (env : env) x n t eo =
adamc@16:     {relC = #relC env,
adamc@16:      namedC = #namedC env,
adamc@16: 
adamc@16:      relE = #relE env,
adamc@20:      namedE = IM.insert (#namedE env, n, (x, t, eo))}
adamc@16: 
adamc@16: fun lookupENamed (env : env) n =
adamc@16:     case IM.find (#namedE env, n) of
adamc@16:         NONE => raise UnboundNamed n
adamc@16:       | SOME x => x
adamc@16: 
adamc@16: fun declBinds env (d, _) =
adamc@16:     case d of
adamc@16:         DCon (x, n, k, c) => pushCNamed env x n k (SOME c)
adamc@20:       | DVal (x, n, t, e) => pushENamed env x n t (SOME e)
adamc@16: 
adamc@16: end