--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/dbmodecheck.sml	Sun Aug 17 13:07:56 2014 -0400
@@ -0,0 +1,86 @@
+(* Copyright (c) 2014, 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 DbModeCheck :> DB_MODE_CHECK = struct
+
+open Mono
+
+structure IM = IntBinaryMap
+
+fun classify (ds, ps) =
+    let
+        fun mergeModes (m1, m2) =
+            case (m1, m2) of
+                (NoDb, _) => m2
+              | (_, NoDb) => m1
+              | _ => AnyDb
+
+        fun modeOf modes =
+            MonoUtil.Exp.fold {typ = fn (_, dbm) => dbm,
+                               exp = fn (EQuery _, dbm) => mergeModes (OneQuery, dbm)
+                                      | (EDml _, _) => AnyDb
+                                      | (ENextval _, _) => AnyDb
+                                      | (ESetval _, _) => AnyDb
+                                      | (ENamed n, dbm) =>
+                                        (case IM.find (modes, n) of
+                                             NONE => dbm
+                                           | SOME dbm' => mergeModes (dbm, dbm'))
+                                      | (_, dbm) => dbm} NoDb
+
+        fun decl ((d, _), modes) =
+            case d of
+                DVal (x, n, _, e, _) => IM.insert (modes, n, modeOf modes e)
+              | DValRec xes =>
+                let
+                    val mode = foldl (fn ((_, _, _, e, _), mode) =>
+                                         let
+                                             val mode' = modeOf modes e
+                                         in
+                                             case mode' of
+                                                 NoDb => mode
+                                               | _ => AnyDb
+                                         end) NoDb xes
+                in
+                    foldl (fn ((_, n, _, _, _), modes) => IM.insert (modes, n, mode)) modes xes
+                end
+              | _ => modes
+
+        val modes = foldl decl IM.empty ds
+
+        val (ps, modes) = ListUtil.foldlMap (fn ((n, side, _), modes) =>
+                                                case IM.find (modes, n) of
+                                                    NONE => ((n, side, AnyDb), modes)
+                                                  | SOME mode => ((n, side, mode), #1 (IM.remove (modes, n))))
+                                            modes ps
+
+        val ps = IM.foldli (fn (n, mode, ps) => (n, ServerOnly, mode) :: ps) ps modes
+    in
+        (ds, ps)
+    end
+
+end
+