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annotate src/core_env.sml @ 74:144d082b47ae

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Reduce efold
author Adam Chlipala <adamc@hcoop.net>
date Thu, 26 Jun 2008 12:12:06 -0400
parents d3cc191cb25f
children f0f59e918cac
rev   line source
adamc@16 1 (* Copyright (c) 2008, Adam Chlipala
adamc@16 2 * All rights reserved.
adamc@16 3 *
adamc@16 4 * Redistribution and use in source and binary forms, with or without
adamc@16 5 * modification, are permitted provided that the following conditions are met:
adamc@16 6 *
adamc@16 7 * - Redistributions of source code must retain the above copyright notice,
adamc@16 8 * this list of conditions and the following disclaimer.
adamc@16 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@16 10 * this list of conditions and the following disclaimer in the documentation
adamc@16 11 * and/or other materials provided with the distribution.
adamc@16 12 * - The names of contributors may not be used to endorse or promote products
adamc@16 13 * derived from this software without specific prior written permission.
adamc@16 14 *
adamc@16 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@16 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@16 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@16 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@16 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@16 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@16 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@16 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@16 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@16 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@16 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@16 26 *)
adamc@16 27
adamc@16 28 structure CoreEnv :> CORE_ENV = struct
adamc@16 29
adamc@16 30 open Core
adamc@16 31
adamc@16 32 structure U = CoreUtil
adamc@16 33
adamc@16 34 structure IM = IntBinaryMap
adamc@16 35
adamc@16 36
adamc@16 37 (* AST utility functions *)
adamc@16 38
adamc@16 39 val liftConInCon =
adamc@16 40 U.Con.mapB {kind = fn k => k,
adamc@16 41 con = fn bound => fn c =>
adamc@16 42 case c of
adamc@16 43 CRel xn =>
adamc@16 44 if xn < bound then
adamc@16 45 c
adamc@16 46 else
adamc@16 47 CRel (xn + 1)
adamc@16 48 | _ => c,
adamc@16 49 bind = fn (bound, U.Con.Rel _) => bound + 1
adamc@16 50 | (bound, _) => bound}
adamc@16 51
adamc@16 52 val lift = liftConInCon 0
adamc@16 53
adamc@16 54
adamc@16 55 (* Back to environments *)
adamc@16 56
adamc@16 57 exception UnboundRel of int
adamc@16 58 exception UnboundNamed of int
adamc@16 59
adamc@16 60 type env = {
adamc@16 61 relC : (string * kind) list,
adamc@16 62 namedC : (string * kind * con option) IM.map,
adamc@16 63
adamc@16 64 relE : (string * con) list,
adamc@20 65 namedE : (string * con * exp option) IM.map
adamc@16 66 }
adamc@16 67
adamc@16 68 val empty = {
adamc@16 69 relC = [],
adamc@16 70 namedC = IM.empty,
adamc@16 71
adamc@16 72 relE = [],
adamc@16 73 namedE = IM.empty
adamc@16 74 }
adamc@16 75
adamc@16 76 fun pushCRel (env : env) x k =
adamc@16 77 {relC = (x, k) :: #relC env,
adamc@16 78 namedC = IM.map (fn (x, k, co) => (x, k, Option.map lift co)) (#namedC env),
adamc@16 79
adamc@16 80 relE = map (fn (x, c) => (x, lift c)) (#relE env),
adamc@20 81 namedE = IM.map (fn (x, c, eo) => (x, lift c, eo)) (#namedE env)}
adamc@16 82
adamc@16 83 fun lookupCRel (env : env) n =
adamc@16 84 (List.nth (#relC env, n))
adamc@16 85 handle Subscript => raise UnboundRel n
adamc@16 86
adamc@16 87 fun pushCNamed (env : env) x n k co =
adamc@16 88 {relC = #relC env,
adamc@16 89 namedC = IM.insert (#namedC env, n, (x, k, co)),
adamc@16 90
adamc@16 91 relE = #relE env,
adamc@16 92 namedE = #namedE env}
adamc@16 93
adamc@16 94 fun lookupCNamed (env : env) n =
adamc@16 95 case IM.find (#namedC env, n) of
adamc@16 96 NONE => raise UnboundNamed n
adamc@16 97 | SOME x => x
adamc@16 98
adamc@16 99 fun pushERel (env : env) x t =
adamc@16 100 {relC = #relC env,
adamc@16 101 namedC = #namedC env,
adamc@16 102
adamc@16 103 relE = (x, t) :: #relE env,
adamc@16 104 namedE = #namedE env}
adamc@16 105
adamc@16 106 fun lookupERel (env : env) n =
adamc@16 107 (List.nth (#relE env, n))
adamc@16 108 handle Subscript => raise UnboundRel n
adamc@16 109
adamc@20 110 fun pushENamed (env : env) x n t eo =
adamc@16 111 {relC = #relC env,
adamc@16 112 namedC = #namedC env,
adamc@16 113
adamc@16 114 relE = #relE env,
adamc@20 115 namedE = IM.insert (#namedE env, n, (x, t, eo))}
adamc@16 116
adamc@16 117 fun lookupENamed (env : env) n =
adamc@16 118 case IM.find (#namedE env, n) of
adamc@16 119 NONE => raise UnboundNamed n
adamc@16 120 | SOME x => x
adamc@16 121
adamc@16 122 fun declBinds env (d, _) =
adamc@16 123 case d of
adamc@16 124 DCon (x, n, k, c) => pushCNamed env x n k (SOME c)
adamc@20 125 | DVal (x, n, t, e) => pushENamed env x n t (SOME e)
adamc@16 126
adamc@16 127 end