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+(* Copyright (c) 2013, Adam Chlipala
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * - The names of contributors may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *)
+
+structure SigCheck :> SIG_CHECK = struct
+
+open Mono
+
+structure IS = IntBinarySet
+structure E = ErrorMsg
+
+fun check (ds, sl) =
+ let
+ fun isSiggy siggers =
+ MonoUtil.Decl.exists {typ = fn _ => false,
+ decl = fn _ => false,
+ exp = fn e =>
+ case e of
+ ERel n => IS.member (siggers, n)
+ | EFfiApp ("Basis", "sigString", _) => true
+ | _ => false}
+
+ fun sigify' sigdecs e =
+ case e of
+ ENamed n => if IS.member (sigdecs, n) then
+ (EApp ((e, E.dummySpan),
+ (ERecord [], E.dummySpan)))
+ else
+ e
+ | _ => e
+
+ fun sigify sigdecs =
+ MonoUtil.Decl.map {typ = fn x => x,
+ decl = fn d => d,
+ exp = sigify' sigdecs}
+
+ fun sigifyE sigdecs =
+ MonoUtil.Exp.map {typ = fn x => x,
+ exp = sigify' sigdecs}
+
+ fun isFun (e, _) =
+ case e of
+ EAbs _ => true
+ | _ => false
+
+ fun doDecl (d : decl, (siggers, sigdecs)) =
+ case #1 d of
+ DVal (x, n, t, e, s) =>
+ if isSiggy siggers d then
+ if isFun e then
+ (sigify sigdecs d, (IS.add (siggers, n), sigdecs))
+ else
+ ((DVal (x, n, (TFun ((TRecord [], #2 d), t), #2 d),
+ (EAbs ("_", (TRecord [], #2 d), t, sigifyE sigdecs e), #2 d),
+ s), #2 d),
+ (IS.add (siggers, n),
+ IS.add (sigdecs, n)))
+ else
+ (sigify sigdecs d, (siggers, sigdecs))
+ | DValRec vis =>
+ if isSiggy siggers d then
+ (sigify sigdecs d,
+ (foldl IS.add' siggers (map #2 vis),
+ sigdecs))
+ else
+ (sigify sigdecs d, (siggers, sigdecs))
+ | _ => (sigify sigdecs d, (siggers, sigdecs))
+
+ val (ds, _) = ListUtil.foldlMap doDecl (IS.empty, IS.empty) ds
+ in
+ (ds, sl)
+ end
+
+end