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@193: val subConInCon =
adamc@193:     U.Con.mapB {kind = fn k => k,
adamc@193:                 con = fn (xn, rep) => fn c =>
adamc@193:                                   case c of
adamc@193:                                       CRel xn' =>
adamc@193:                                       (case Int.compare (xn', xn) of
adamc@193:                                            EQUAL => #1 rep
adamc@193:                                          | GREATER => CRel (xn' - 1)
adamc@193:                                          | LESS => c)
adamc@193:                                     | _ => c,
adamc@193:                 bind = fn ((xn, rep), U.Con.Rel _) => (xn+1, liftConInCon 0 rep)
adamc@193:                         | (ctx, _) => ctx}
adamc@193: 
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@192:      datatypes : (string * string list * (string * int * con option) list) IM.map,
adamc@192:      constructors : (string * string list * con option * int) IM.map,
adamc@168: 
adamc@16:      relE : (string * con) list,
adamc@109:      namedE : (string * con * exp option * string) IM.map
adamc@16: }
adamc@16: 
adamc@16: val empty = {
adamc@16:     relC = [],
adamc@16:     namedC = IM.empty,
adamc@16: 
adamc@168:     datatypes = IM.empty,
adamc@177:     constructors = IM.empty,
adamc@168: 
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@168:      datatypes = #datatypes env,
adamc@177:      constructors = #constructors env,
adamc@168: 
adamc@16:      relE = map (fn (x, c) => (x, lift c)) (#relE env),
adamc@109:      namedE = IM.map (fn (x, c, eo, s) => (x, lift c, eo, s)) (#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@168:      datatypes = #datatypes env,
adamc@177:      constructors = #constructors env,
adamc@168:      
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@192: fun pushDatatype (env : env) x n xs xncs =
adamc@168:     {relC = #relC env,
adamc@168:      namedC = #namedC env,
adamc@168: 
adamc@192:      datatypes = IM.insert (#datatypes env, n, (x, xs, xncs)),
adamc@182:      constructors = foldl (fn ((x, n', to), constructors) =>
adamc@192:                               IM.insert (constructors, n', (x, xs, to, n)))
adamc@177:                           (#constructors env) xncs,
adamc@168:      
adamc@168:      relE = #relE env,
adamc@168:      namedE = #namedE env}
adamc@168: 
adamc@168: fun lookupDatatype (env : env) n =
adamc@168:     case IM.find (#datatypes env, n) of
adamc@168:         NONE => raise UnboundNamed n
adamc@168:       | SOME x => x
adamc@168: 
adamc@177: fun lookupConstructor (env : env) n =
adamc@177:     case IM.find (#constructors env, n) of
adamc@177:         NONE => raise UnboundNamed n
adamc@177:       | SOME x => x
adamc@177: 
adamc@16: fun pushERel (env : env) x t =
adamc@16:     {relC = #relC env,
adamc@16:      namedC = #namedC env,
adamc@16: 
adamc@168:      datatypes = #datatypes env,
adamc@177:      constructors = #constructors env,
adamc@168: 
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@109: fun pushENamed (env : env) x n t eo s =
adamc@16:     {relC = #relC env,
adamc@16:      namedC = #namedC env,
adamc@16: 
adamc@168:      datatypes = #datatypes env,
adamc@177:      constructors = #constructors env,
adamc@168: 
adamc@16:      relE = #relE env,
adamc@109:      namedE = IM.insert (#namedE env, n, (x, t, eo, s))}
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@163: fun declBinds env (d, loc) =
adamc@16:     case d of
adamc@16:         DCon (x, n, k, c) => pushCNamed env x n k (SOME c)
adamc@192:       | DDatatype (x, n, xs, xncs) =>
adamc@163:         let
adamc@192:             val env = pushDatatype env x n xs xncs
adamc@163:             val env = pushCNamed env x n (KType, loc) NONE
adamc@163:         in
adamc@163:             foldl (fn ((x', n', NONE), env) => pushENamed env x' n' (CNamed n, loc) NONE ""
adamc@163:                     | ((x', n', SOME t), env) => pushENamed env x' n' (TFun (t, (CNamed n, loc)), loc) NONE "")
adamc@163:             env xncs
adamc@163:         end
adamc@109:       | DVal (x, n, t, e, s) => pushENamed env x n t (SOME e) s
adamc@126:       | DValRec vis => foldl (fn ((x, n, t, e, s), env) => pushENamed env x n t NONE s) env vis
adamc@109:       | DExport _ => env
adamc@16: 
adamc@193: fun patBinds env (p, loc) =
adamc@193:     case p of
adamc@193:         PWild => env
adamc@193:       | PVar (x, t) => pushERel env x t
adamc@193:       | PPrim _ => env
adamc@193:       | PCon (_, _, _, NONE) => env
adamc@193:       | PCon (_, _, _, SOME p) => patBinds env p
adamc@193:       | PRecord xps => foldl (fn ((_, p, _), env) => patBinds env p) env xps
adamc@193: 
adamc@16: end