# HG changeset patch
# User Ziv Scully <ziv@mit.edu>
# Date 1448007981 18000
# Node ID 8d772fbf59c13bf1a40a3cbb146cdea978562db0
# Parent  57f6473b14690a4cd40a77905b8a0d2830b780f5
Tweak cache consolidation and choose better default.

diff -r 57f6473b1469 -r 8d772fbf59c1 src/main.mlton.sml
--- a/src/main.mlton.sml	Thu Nov 19 18:13:01 2015 -0500
+++ b/src/main.mlton.sml	Fri Nov 20 03:26:21 2015 -0500
@@ -163,7 +163,7 @@
                 (Settings.setSqlcache true;
                  doArgs rest)
               | "-heuristic" :: h :: rest =>
-                (Settings.setSqlcacheHeuristic h;
+                (Sqlcache.setHeuristic h;
                  doArgs rest)
               | "-moduleOf" :: fname :: _ =>
                 (print (Compiler.moduleOf fname ^ "\n");
diff -r 57f6473b1469 -r 8d772fbf59c1 src/settings.sig
--- a/src/settings.sig	Thu Nov 19 18:13:01 2015 -0500
+++ b/src/settings.sig	Fri Nov 20 03:26:21 2015 -0500
@@ -281,8 +281,6 @@
 
     val setSqlcache : bool -> unit
     val getSqlcache : unit -> bool
-    val setSqlcacheHeuristic : string -> unit
-    val getSqlcacheHeuristic : unit -> string
 
     val setFilePath : string -> unit
     (* Sets the directory where we look for files being added below. *)
diff -r 57f6473b1469 -r 8d772fbf59c1 src/settings.sml
--- a/src/settings.sml	Thu Nov 19 18:13:01 2015 -0500
+++ b/src/settings.sml	Fri Nov 20 03:26:21 2015 -0500
@@ -811,10 +811,6 @@
 fun setSqlcache b = sqlcache := b
 fun getSqlcache () = !sqlcache
 
-val sqlcacheHeuristic = ref "always"
-fun setSqlcacheHeuristic h = sqlcacheHeuristic := h
-fun getSqlcacheHeuristic () = !sqlcacheHeuristic
-
 structure SM = BinaryMapFn(struct
                            type ord_key = string
                            val compare = String.compare
diff -r 57f6473b1469 -r 8d772fbf59c1 src/sqlcache.sig
--- a/src/sqlcache.sig	Thu Nov 19 18:13:01 2015 -0500
+++ b/src/sqlcache.sig	Fri Nov 20 03:26:21 2015 -0500
@@ -3,6 +3,8 @@
 val setCache : Cache.cache -> unit
 val getCache : unit -> Cache.cache
 
+val setHeuristic : string -> unit
+
 val getFfiInfo : unit -> {index : int, params : int} list
 val go : Mono.file -> Mono.file
 
diff -r 57f6473b1469 -r 8d772fbf59c1 src/sqlcache.sml
--- a/src/sqlcache.sml	Thu Nov 19 18:13:01 2015 -0500
+++ b/src/sqlcache.sml	Fri Nov 20 03:26:21 2015 -0500
@@ -93,12 +93,11 @@
 fun setCache c = cacheRef := c
 fun getCache () = !cacheRef
 
-datatype heuristic = SmartEq (* | SmartSub *) | Always | Never | NoPureAll | NoPureOne | NoCombo
+datatype heuristic = Smart | Always | Never | NoPureAll | NoPureOne | NoCombo
 
-val heuristicRef = ref Always
+val heuristicRef = ref NoPureOne
 fun setHeuristic h = heuristicRef := (case h of
-                                          "smarteq" => SmartEq
-                                        (* | "smartsub" => SmartSub *)
+                                          "smart" => Smart
                                         | "always" => Always
                                         | "never" => Never
                                         | "nopureall" => NoPureAll
@@ -498,6 +497,7 @@
             structure I = SK
             structure J = SK
             structure K = struct type ord_key = Mono.typ val compare = MonoUtil.Typ.compare end)))
+    structure AS = BinarySetFn(AK)
     structure AM = BinaryMapFn(AK)
 
     (* Traversal Utilities *)
@@ -615,13 +615,16 @@
 
     val union = op@
 
-    fun addToSqlArgsMap ((q, subst), acc) =
-        IM.foldl (fn (arg, acc) => AM.insert (acc, arg, ())) acc subst
+    fun sqlArgsSet (q, subst) =
+        IM.foldl AS.add' AS.empty subst
 
     fun sqlArgsMap (qs : t) =
         let
             val args =
-                List.foldl addToSqlArgsMap AM.empty qs
+                List.foldl (fn ((q, subst), acc) =>
+                               IM.foldl (fn (arg, acc) => AM.insert (acc, arg, ())) acc subst)
+                           AM.empty
+                           qs
             val countRef = ref (~1)
             fun count () = (countRef := !countRef + 1; !countRef)
         in
@@ -649,25 +652,26 @@
             val pureArgs = PS.difference (paths, invalPaths)
             val shouldCache =
                 case getHeuristic () of
-                    SmartEq =>
+                    Smart =>
                     (case (qs, PS.numItems pureArgs) of
                          ((q::qs), 0) =>
                          let
-                             val m = addToSqlArgsMap (q, AM.empty)
-                             val ms = map (fn q => addToSqlArgsMap (q, AM.empty)) qs
-                             fun test (m, acc) =
+                             val args = sqlArgsSet q
+                             val argss = map sqlArgsSet qs
+                             fun test (args, acc) =
                                  acc
                                  <\obind\>
-                                  (fn m' =>
+                                  (fn args' =>
                                       let
-                                          val mm = AM.unionWith #1 (m, m')
+                                          val both = AS.union (args, args')
                                       in
-                                          AM.numItems m = AM.numItems mm
+                                          (AS.numItems args = AS.numItems both
+                                           orelse AS.numItems args' = AS.numItems both)
                                           <\oguard\>
-                                           (fn _ => SOME mm)
+                                           (fn _ => SOME both)
                                       end)
                          in
-                             case List.foldl test (SOME m) ms of
+                             case List.foldl test (SOME args) argss of
                                  NONE => false
                                | SOME _ => true
                          end
@@ -1714,9 +1718,7 @@
 fun go file =
     let
         (* TODO: do something nicer than [Sql] being in one of two modes. *)
-        val () = (resetFfiInfo ();
-                  Sql.sqlcacheMode := true;
-                  setHeuristic (Settings.getSqlcacheHeuristic ()))
+        val () = (resetFfiInfo (); Sql.sqlcacheMode := true)
         val file = go' file
         (* Important that this happens after [MonoFooify.urlify] calls! *)
         val fmDecls = MonoFooify.getNewFmDecls ()