Added a new SimplifyComms module, containing a new (currently dummy) pass, outExprs

Makefile.am

@@ -46,6 +46,7 @@ CLEANFILES = $(BUILT_SOURCES)
 
 tock_SOURCES = transformations/SimplifyExprs.hs transformations/SimplifyTypes.hs 
 tock_SOURCES += transformations/Unnest.hs transformations/UsageCheck.hs transformations/SimplifyProcs.hs
+tock_SOURCES += transformations/SimplifyComms.hs
 tock_SOURCES += frontends/PreprocessOccam.hs frontends/ParseRain.hs frontends/StructureOccam.hs
 tock_SOURCES += frontends/ParseOccam.hs frontends/RainTypes.hs frontends/RainPasses.hs frontends/ParseUtils.hs
 tock_SOURCES += frontends/LexOccam.x frontends/LexRain.x

transformations/SimplifyComms.hs

@@ -0,0 +1,39 @@
+{-
+Tock: a compiler for parallel languages
+Copyright (C) 2007  University of Kent
+
+This program is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation, either version 2 of the License, or (at your
+option) any later version.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License along
+with this program.  If not, see <http://www.gnu.org/licenses/>.
+-}
+
+-- | Simplify communications.
+module SimplifyComms where
+
+import Control.Monad.State
+import Data.Generics
+
+import qualified AST as A
+import CompState
+import Metadata
+import Types
+import Pass
+
+simplifyComms :: A.Process -> PassM A.Process
+simplifyComms = runPasses passes
+  where
+    passes =
+      [ ("Define temporary variables for outputting expressions", outExprs)
+      ]
+
+outExprs :: Data t => t -> PassM t
+outExprs = return