From 94985402292306da1db46b1750927ef46bdb87d3 Mon Sep 17 00:00:00 2001
From: Bernhard Urban <lewurm@gmail.com>
Date: Wed, 18 Jul 2012 19:33:33 +0200
Subject: [PATCH] globalmaphack: use old school CPP

I tried (1) typeclasses and (2) TH, but failed:
(1) typeclasses are not designed to emulate object managment
(2) TH needs GHCi (or at least something at compile-time?), and this doesn't
    work well with MateVM build stuff :/
---
 Makefile      |  2 +-
 Mate/Types.hs | 91 +++++++++++++--------------------------------------
 2 files changed, 24 insertions(+), 69 deletions(-)

diff --git a/Makefile b/Makefile
index cd0e887..00007fa 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ O_STATIC_FILES = $(shell ls $(B_STATIC)/Mate/*.o) $(wildcard $(B_STATIC)/ffi/*.o
 PACKAGES_ := bytestring harpy hs-java plugins
 PACKAGES := $(addprefix -package ,$(PACKAGES_))
 
-GHC_OPT := -I. -Wall -O0 -fno-warn-unused-do-bind -rtsopts
+GHC_OPT := -I. -Wall -O0 -fno-warn-unused-do-bind -rtsopts -cpp -pgmP cpphs -optP --cpp
 GHC_LD := -optl-Xlinker -optl-x
 
 
diff --git a/Mate/Types.hs b/Mate/Types.hs
index 5405a43..dbf7e73 100644
--- a/Mate/Types.hs
+++ b/Mate/Types.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE CPP #-}
 module Mate.Types where
 
 import Data.Word
@@ -98,6 +99,7 @@ toString :: B.ByteString -> String
 toString bstr = decodeString $ map (chr . fromIntegral) $ B.unpack bstr
 -}
 
+-- better solutions for a global map hack are welcome! (typeclasses, TH, ...?)
 
 data MateCtx = MateCtx {
   ctxMethodMap :: MethodMap,
@@ -115,79 +117,32 @@ mateCtx :: IORef MateCtx
 {-# NOINLINE mateCtx #-}
 mateCtx = unsafePerformIO $ newIORef emptyMateCtx
 
+-- TODO(bernhard): if we ever have thread support, don't forget MVars
+#define SETMAP(name) set##name :: name -> IO (); \
+  set##name m = do ctx <- readIORef mateCtx; \
+  writeIORef mateCtx $ ctx { ctx##name = m };
 
-setMethodMap :: MethodMap -> IO ()
-setMethodMap m = do
-  ctx <- readIORef mateCtx
-  writeIORef mateCtx $ ctx { ctxMethodMap = m }
+#define GETMAP(name) get##name :: IO name ; \
+  get##name = do ctx <- readIORef mateCtx; \
+  return $ ctx##name ctx;
 
-getMethodMap :: IO MethodMap
-getMethodMap = do
-  ctx <- readIORef mateCtx
-  return $ ctxMethodMap ctx
+SETMAP(MethodMap);
+GETMAP(MethodMap)
 
+SETMAP(TrapMap)
+GETMAP(TrapMap)
 
-setTrapMap :: TrapMap -> IO ()
-setTrapMap m = do
-  ctx <- readIORef mateCtx
-  writeIORef mateCtx $ ctx { ctxTrapMap = m }
+SETMAP(ClassMap)
+GETMAP(ClassMap)
 
-getTrapMap :: IO TrapMap
-getTrapMap = do
-  ctx <- readIORef mateCtx
-  return $ ctxTrapMap ctx
+SETMAP(VirtualMap)
+GETMAP(VirtualMap)
 
+SETMAP(StringMap)
+GETMAP(StringMap)
 
-setClassMap :: ClassMap -> IO ()
-setClassMap m = do
-  ctx <- readIORef mateCtx
-  writeIORef mateCtx $ ctx { ctxClassMap = m }
+SETMAP(InterfaceMap)
+GETMAP(InterfaceMap)
 
-getClassMap :: IO ClassMap
-getClassMap = do
-  ctx <- readIORef mateCtx
-  return $ ctxClassMap ctx
-
-
-setVirtualMap :: VirtualMap -> IO ()
-setVirtualMap m = do
-  ctx <- readIORef mateCtx
-  writeIORef mateCtx $ ctx { ctxVirtualMap = m }
-
-getVirtualMap :: IO VirtualMap
-getVirtualMap = do
-  ctx <- readIORef mateCtx
-  return $ ctxVirtualMap ctx
-
-
-setStringMap :: StringMap -> IO ()
-setStringMap m = do
-  ctx <- readIORef mateCtx
-  writeIORef mateCtx $ ctx { ctxStringMap = m }
-
-getStringMap :: IO StringMap
-getStringMap = do
-  ctx <- readIORef mateCtx
-  return $ ctxStringMap ctx
-
-
-setInterfaceMap :: InterfaceMap -> IO ()
-setInterfaceMap m = do
-  ctx <- readIORef mateCtx
-  writeIORef mateCtx $ ctx { ctxInterfaceMap = m }
-
-getInterfaceMap :: IO InterfaceMap
-getInterfaceMap = do
-  ctx <- readIORef mateCtx
-  return $ ctxInterfaceMap ctx
-
-
-setInterfaceMethodMap :: InterfaceMethodMap -> IO ()
-setInterfaceMethodMap m = do
-  ctx <- readIORef mateCtx
-  writeIORef mateCtx $ ctx { ctxInterfaceMethodMap = m }
-
-getInterfaceMethodMap :: IO InterfaceMethodMap
-getInterfaceMethodMap = do
-  ctx <- readIORef mateCtx
-  return $ ctxInterfaceMethodMap ctx
+SETMAP(InterfaceMethodMap)
+GETMAP(InterfaceMethodMap)
-- 
2.25.1