adamc@29: (* Copyright (c) 2008, Adam Chlipala adamc@29: * All rights reserved. adamc@29: * adamc@29: * Redistribution and use in source and binary forms, with or without adamc@29: * modification, are permitted provided that the following conditions are met: adamc@29: * adamc@29: * - Redistributions of source code must retain the above copyright notice, adamc@29: * this list of conditions and the following disclaimer. adamc@29: * - Redistributions in binary form must reproduce the above copyright notice, adamc@29: * this list of conditions and the following disclaimer in the documentation adamc@29: * and/or other materials provided with the distribution. adamc@29: * - The names of contributors may not be used to endorse or promote products adamc@29: * derived from this software without specific prior written permission. adamc@29: * adamc@29: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" adamc@29: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE adamc@29: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE adamc@29: * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE adamc@29: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR adamc@29: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF adamc@29: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS adamc@29: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN adamc@29: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) adamc@29: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE adamc@29: * POSSIBILITY OF SUCH DAMAGE. adamc@29: *) adamc@29: adamc@29: structure CjrEnv :> CJR_ENV = struct adamc@29: adamc@29: open Cjr adamc@29: adamc@29: structure IM = IntBinaryMap adamc@29: adamc@29: adamc@29: exception UnboundRel of int adamc@29: exception UnboundNamed of int adamc@29: exception UnboundF of int adamc@101: exception UnboundStruct of int adamc@29: adamc@29: type env = { adamc@29: namedT : (string * typ option) IM.map, adamc@29: adamc@29: numRelE : int, adamc@29: relE : (string * typ) list, adamc@29: namedE : (string * typ) IM.map, adamc@29: adamc@101: structs : (string * typ) list IM.map adamc@29: } adamc@29: adamc@29: val empty = { adamc@29: namedT = IM.empty, adamc@29: adamc@29: numRelE = 0, adamc@29: relE = [], adamc@29: namedE = IM.empty, adamc@29: adamc@101: structs = IM.empty adamc@29: } adamc@29: adamc@29: fun pushTNamed (env : env) x n co = adamc@29: {namedT = IM.insert (#namedT env, n, (x, co)), adamc@29: adamc@29: numRelE = #numRelE env, adamc@29: relE = #relE env, adamc@29: namedE = #namedE env, adamc@29: adamc@101: structs = #structs env} adamc@29: adamc@29: fun lookupTNamed (env : env) n = adamc@29: case IM.find (#namedT env, n) of adamc@29: NONE => raise UnboundNamed n adamc@29: | SOME x => x adamc@29: adamc@29: fun pushERel (env : env) x t = adamc@29: {namedT = #namedT env, adamc@29: adamc@29: numRelE = #numRelE env + 1, adamc@29: relE = (x, t) :: #relE env, adamc@29: namedE = #namedE env, adamc@29: adamc@101: structs = #structs env} adamc@29: adamc@29: fun lookupERel (env : env) n = adamc@29: (List.nth (#relE env, n)) adamc@29: handle Subscript => raise UnboundRel n adamc@29: adamc@29: fun countERels (env : env) = #numRelE env adamc@29: adamc@29: fun listERels (env : env) = #relE env adamc@29: adamc@29: fun pushENamed (env : env) x n t = adamc@29: {namedT = #namedT env, adamc@29: adamc@29: numRelE = #numRelE env, adamc@29: relE = #relE env, adamc@29: namedE = IM.insert (#namedE env, n, (x, t)), adamc@29: adamc@101: structs = #structs env} adamc@29: adamc@29: fun lookupENamed (env : env) n = adamc@29: case IM.find (#namedE env, n) of adamc@29: NONE => raise UnboundNamed n adamc@29: | SOME x => x adamc@29: adamc@101: fun pushStruct (env : env) n xts = adamc@101: {namedT = #namedT env, adamc@101: adamc@101: numRelE = #numRelE env, adamc@101: relE = #relE env, adamc@101: namedE = #namedE env, adamc@101: adamc@101: structs = IM.insert (#structs env, n, xts)} adamc@101: adamc@101: fun lookupStruct (env : env) n = adamc@101: case IM.find (#structs env, n) of adamc@101: NONE => raise UnboundStruct n adamc@101: | SOME x => x adamc@101: adamc@109: fun declBinds env (d, loc) = adamc@29: case d of adamc@29: DVal (x, n, t, _) => pushENamed env x n t adamc@121: | DFun (fx, n, args, ran, _) => adamc@121: let adamc@121: val t = foldl (fn ((_, arg), t) => (TFun (arg, t), loc)) ran args adamc@121: in adamc@121: pushENamed env fx n t adamc@121: end adamc@129: | DFunRec vis => adamc@129: foldl (fn ((fx, n, args, ran, _), env) => adamc@129: let adamc@129: val t = foldl (fn ((_, arg), t) => (TFun (arg, t), loc)) ran args adamc@129: in adamc@129: pushENamed env fx n t adamc@129: end) env vis adamc@101: | DStruct (n, xts) => pushStruct env n xts adamc@29: adamc@29: end