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annotate src/core_env.sml @ 312:f387d12193ba

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Datatype positivity check
author Adam Chlipala <adamc@hcoop.net>
date Tue, 09 Sep 2008 09:15:00 -0400
parents 42dfb0d61cf0
children e21d0dddda09
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@193 54 val subConInCon =
adamc@193 55 U.Con.mapB {kind = fn k => k,
adamc@193 56 con = fn (xn, rep) => fn c =>
adamc@193 57 case c of
adamc@193 58 CRel xn' =>
adamc@193 59 (case Int.compare (xn', xn) of
adamc@193 60 EQUAL => #1 rep
adamc@193 61 | GREATER => CRel (xn' - 1)
adamc@193 62 | LESS => c)
adamc@193 63 | _ => c,
adamc@193 64 bind = fn ((xn, rep), U.Con.Rel _) => (xn+1, liftConInCon 0 rep)
adamc@193 65 | (ctx, _) => ctx}
adamc@193 66
adamc@16 67
adamc@16 68 (* Back to environments *)
adamc@16 69
adamc@16 70 exception UnboundRel of int
adamc@16 71 exception UnboundNamed of int
adamc@16 72
adamc@16 73 type env = {
adamc@16 74 relC : (string * kind) list,
adamc@16 75 namedC : (string * kind * con option) IM.map,
adamc@16 76
adamc@192 77 datatypes : (string * string list * (string * int * con option) list) IM.map,
adamc@192 78 constructors : (string * string list * con option * int) IM.map,
adamc@168 79
adamc@16 80 relE : (string * con) list,
adamc@109 81 namedE : (string * con * exp option * string) IM.map
adamc@16 82 }
adamc@16 83
adamc@16 84 val empty = {
adamc@16 85 relC = [],
adamc@16 86 namedC = IM.empty,
adamc@16 87
adamc@168 88 datatypes = IM.empty,
adamc@177 89 constructors = IM.empty,
adamc@168 90
adamc@16 91 relE = [],
adamc@16 92 namedE = IM.empty
adamc@16 93 }
adamc@16 94
adamc@16 95 fun pushCRel (env : env) x k =
adamc@16 96 {relC = (x, k) :: #relC env,
adamc@16 97 namedC = IM.map (fn (x, k, co) => (x, k, Option.map lift co)) (#namedC env),
adamc@16 98
adamc@168 99 datatypes = #datatypes env,
adamc@177 100 constructors = #constructors env,
adamc@168 101
adamc@16 102 relE = map (fn (x, c) => (x, lift c)) (#relE env),
adamc@109 103 namedE = IM.map (fn (x, c, eo, s) => (x, lift c, eo, s)) (#namedE env)}
adamc@16 104
adamc@16 105 fun lookupCRel (env : env) n =
adamc@16 106 (List.nth (#relC env, n))
adamc@16 107 handle Subscript => raise UnboundRel n
adamc@16 108
adamc@16 109 fun pushCNamed (env : env) x n k co =
adamc@16 110 {relC = #relC env,
adamc@16 111 namedC = IM.insert (#namedC env, n, (x, k, co)),
adamc@16 112
adamc@168 113 datatypes = #datatypes env,
adamc@177 114 constructors = #constructors env,
adamc@168 115
adamc@16 116 relE = #relE env,
adamc@16 117 namedE = #namedE env}
adamc@16 118
adamc@16 119 fun lookupCNamed (env : env) n =
adamc@16 120 case IM.find (#namedC env, n) of
adamc@16 121 NONE => raise UnboundNamed n
adamc@16 122 | SOME x => x
adamc@16 123
adamc@192 124 fun pushDatatype (env : env) x n xs xncs =
adamc@168 125 {relC = #relC env,
adamc@168 126 namedC = #namedC env,
adamc@168 127
adamc@192 128 datatypes = IM.insert (#datatypes env, n, (x, xs, xncs)),
adamc@182 129 constructors = foldl (fn ((x, n', to), constructors) =>
adamc@192 130 IM.insert (constructors, n', (x, xs, to, n)))
adamc@177 131 (#constructors env) xncs,
adamc@168 132
adamc@168 133 relE = #relE env,
adamc@168 134 namedE = #namedE env}
adamc@168 135
adamc@168 136 fun lookupDatatype (env : env) n =
adamc@168 137 case IM.find (#datatypes env, n) of
adamc@168 138 NONE => raise UnboundNamed n
adamc@168 139 | SOME x => x
adamc@168 140
adamc@177 141 fun lookupConstructor (env : env) n =
adamc@177 142 case IM.find (#constructors env, n) of
adamc@177 143 NONE => raise UnboundNamed n
adamc@177 144 | SOME x => x
adamc@177 145
adamc@16 146 fun pushERel (env : env) x t =
adamc@16 147 {relC = #relC env,
adamc@16 148 namedC = #namedC env,
adamc@16 149
adamc@168 150 datatypes = #datatypes env,
adamc@177 151 constructors = #constructors env,
adamc@168 152
adamc@16 153 relE = (x, t) :: #relE env,
adamc@16 154 namedE = #namedE env}
adamc@16 155
adamc@16 156 fun lookupERel (env : env) n =
adamc@16 157 (List.nth (#relE env, n))
adamc@16 158 handle Subscript => raise UnboundRel n
adamc@16 159
adamc@109 160 fun pushENamed (env : env) x n t eo s =
adamc@16 161 {relC = #relC env,
adamc@16 162 namedC = #namedC env,
adamc@16 163
adamc@168 164 datatypes = #datatypes env,
adamc@177 165 constructors = #constructors env,
adamc@168 166
adamc@16 167 relE = #relE env,
adamc@109 168 namedE = IM.insert (#namedE env, n, (x, t, eo, s))}
adamc@16 169
adamc@16 170 fun lookupENamed (env : env) n =
adamc@16 171 case IM.find (#namedE env, n) of
adamc@16 172 NONE => raise UnboundNamed n
adamc@16 173 | SOME x => x
adamc@16 174
adamc@163 175 fun declBinds env (d, loc) =
adamc@16 176 case d of
adamc@16 177 DCon (x, n, k, c) => pushCNamed env x n k (SOME c)
adamc@192 178 | DDatatype (x, n, xs, xncs) =>
adamc@163 179 let
adamc@192 180 val env = pushDatatype env x n xs xncs
adamc@163 181 val env = pushCNamed env x n (KType, loc) NONE
adamc@163 182 in
adamc@163 183 foldl (fn ((x', n', NONE), env) => pushENamed env x' n' (CNamed n, loc) NONE ""
adamc@163 184 | ((x', n', SOME t), env) => pushENamed env x' n' (TFun (t, (CNamed n, loc)), loc) NONE "")
adamc@163 185 env xncs
adamc@163 186 end
adamc@109 187 | DVal (x, n, t, e, s) => pushENamed env x n t (SOME e) s
adamc@126 188 | DValRec vis => foldl (fn ((x, n, t, e, s), env) => pushENamed env x n t NONE s) env vis
adamc@109 189 | DExport _ => env
adamc@247 190 | DTable (x, n, c, s) =>
adamc@247 191 let
adamc@247 192 val t = (CApp ((CFfi ("Basis", "table"), loc), c), loc)
adamc@247 193 in
adamc@247 194 pushENamed env x n t NONE s
adamc@247 195 end
adamc@271 196 | DDatabase _ => env
adamc@16 197
adamc@193 198 fun patBinds env (p, loc) =
adamc@193 199 case p of
adamc@193 200 PWild => env
adamc@193 201 | PVar (x, t) => pushERel env x t
adamc@193 202 | PPrim _ => env
adamc@193 203 | PCon (_, _, _, NONE) => env
adamc@193 204 | PCon (_, _, _, SOME p) => patBinds env p
adamc@193 205 | PRecord xps => foldl (fn ((_, p, _), env) => patBinds env p) env xps
adamc@193 206
adamc@16 207 end