BinIface.hs 36.8 KB
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-- 
--  (c) The University of Glasgow 2002-2006
-- 
-- Binary interface file support.

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module BinIface ( writeBinIface, readBinIface,
                  CheckHiWay(..), TraceBinIFaceReading(..) ) where
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#include "HsVersions.h"

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import TcRnMonad
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import IfaceEnv
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import HscTypes
import BasicTypes
import NewDemand
import IfaceSyn
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import Module
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import Name
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import OccName
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import VarEnv
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import InstEnv
import Class
import DynFlags
import UniqFM
import UniqSupply
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import CostCentre
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import StaticFlags
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import Panic
import Binary
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import SrcLoc
import ErrUtils
import Config
import FastMutInt
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import Unique
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import Outputable
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import FastString
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import Data.List
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import Data.Word
import Data.Array
import Data.IORef
import Control.Exception
import Control.Monad
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data CheckHiWay = CheckHiWay | IgnoreHiWay
    deriving Eq

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data TraceBinIFaceReading = TraceBinIFaceReading | QuietBinIFaceReading
    deriving Eq

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-- ---------------------------------------------------------------------------
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-- Reading and writing binary interface files

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readBinIface :: CheckHiWay -> TraceBinIFaceReading -> FilePath
             -> TcRnIf a b ModIface
readBinIface checkHiWay traceBinIFaceReading hi_path = do
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  nc <- getNameCache
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  (new_nc, iface) <- liftIO $
    readBinIface_ checkHiWay traceBinIFaceReading hi_path nc
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  setNameCache new_nc
  return iface

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readBinIface_ :: CheckHiWay -> TraceBinIFaceReading -> FilePath -> NameCache
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              -> IO (NameCache, ModIface)
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readBinIface_ checkHiWay traceBinIFaceReading hi_path nc = do
  let printer :: SDoc -> IO ()
      printer = case traceBinIFaceReading of
                TraceBinIFaceReading -> \sd -> printSDoc sd defaultDumpStyle
                QuietBinIFaceReading -> \_ -> return ()
      wantedGot :: Outputable a => String -> a -> a -> IO ()
      wantedGot what wanted got
          = printer (text what <> text ": " <>
                     vcat [text "Wanted " <> ppr wanted <> text ",",
                           text "got    " <> ppr got])
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      errorOnMismatch :: (Eq a, Show a) => String -> a -> a -> IO ()
      errorOnMismatch what wanted got
            -- This will be caught by readIface which will emit an error
            -- msg containing the iface module name.
          = when (wanted /= got) $ throwDyn $ ProgramError
                        (what ++ " (wanted " ++ show wanted
                              ++ ", got "    ++ show got ++ ")")
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  bh <- Binary.readBinMem hi_path

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        -- Read the magic number to check that this really is a GHC .hi file
        -- (This magic number does not change when we change
        --  GHC interface file format)
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  magic <- get bh
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  wantedGot "Magic" binaryInterfaceMagic magic
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  errorOnMismatch "magic number mismatch: old/corrupt interface file?"
      binaryInterfaceMagic magic
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        -- Get the dictionary pointer.  We won't attempt to actually
        -- read the dictionary until we've done the version checks below,
        -- just in case this isn't a valid interface.  In retrospect the
        -- version should have come before the dictionary pointer, but this
        -- is the way it was done originally, and we can't change it now.
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  dict_p <- Binary.get bh       -- Get the dictionary ptr
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        -- Check the interface file version and ways.
  check_ver  <- get bh
  let our_ver = show opt_HiVersion
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  wantedGot "Version" our_ver check_ver
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  errorOnMismatch "mismatched interface file versions" our_ver check_ver
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  check_way <- get bh
  way_descr <- getWayDescr
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  wantedGot "Way" way_descr check_way
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  when (checkHiWay == CheckHiWay) $
       errorOnMismatch "mismatched interface file ways" way_descr check_way
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        -- Read the dictionary
        -- The next word in the file is a pointer to where the dictionary is
        -- (probably at the end of the file)
  data_p <- tellBin bh          -- Remember where we are now
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  seekBin bh dict_p
  dict <- getDictionary bh
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  seekBin bh data_p             -- Back to where we were before
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        -- Initialise the user-data field of bh
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  ud <- newReadState dict
  bh <- return (setUserData bh ud)
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  symtab_p <- Binary.get bh     -- Get the symtab ptr
  data_p <- tellBin bh          -- Remember where we are now
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  seekBin bh symtab_p
  (nc', symtab) <- getSymbolTable bh nc
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  seekBin bh data_p             -- Back to where we were before
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  let ud = getUserData bh
  bh <- return $! setUserData bh ud{ud_symtab = symtab}
  iface <- get bh
  return (nc', iface)


writeBinIface :: DynFlags -> FilePath -> ModIface -> IO ()
writeBinIface dflags hi_path mod_iface = do
  bh <- openBinMem initBinMemSize
  put_ bh binaryInterfaceMagic

	-- Remember where the dictionary pointer will go
  dict_p_p <- tellBin bh
  put_ bh dict_p_p	-- Placeholder for ptr to dictionary

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        -- The version and way descriptor go next
  put_ bh (show opt_HiVersion)
  way_descr <- getWayDescr
  put  bh way_descr

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        -- Remember where the symbol table pointer will go
  symtab_p_p <- tellBin bh
  put_ bh symtab_p_p

	-- Make some intial state
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  symtab_next <- newFastMutInt
  writeFastMutInt symtab_next 0
  symtab_map <- newIORef emptyUFM
  let bin_symtab = BinSymbolTable {
                      bin_symtab_next = symtab_next,
                      bin_symtab_map  = symtab_map }
  dict_next_ref <- newFastMutInt
  writeFastMutInt dict_next_ref 0
  dict_map_ref <- newIORef emptyUFM
  let bin_dict = BinDictionary {
                      bin_dict_next = dict_next_ref,
                      bin_dict_map  = dict_map_ref }
  ud <- newWriteState (putName bin_symtab) (putFastString bin_dict)
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	-- Put the main thing, 
  bh <- return $ setUserData bh ud
  put_ bh mod_iface

	-- Write the symtab pointer at the fornt of the file
  symtab_p <- tellBin bh	        -- This is where the symtab will start
  putAt bh symtab_p_p symtab_p	-- Fill in the placeholder
  seekBin bh symtab_p		-- Seek back to the end of the file

        -- Write the symbol table itself
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  symtab_next <- readFastMutInt symtab_next
  symtab_map  <- readIORef symtab_map
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  putSymbolTable bh symtab_next symtab_map
  debugTraceMsg dflags 3 (text "writeBinIface:" <+> int symtab_next 
                                <+> text "Names")

        -- NB. write the dictionary after the symbol table, because
        -- writing the symbol table may create more dictionary entries.

	-- Write the dictionary pointer at the fornt of the file
  dict_p <- tellBin bh	        -- This is where the dictionary will start
  putAt bh dict_p_p dict_p	-- Fill in the placeholder
  seekBin bh dict_p		-- Seek back to the end of the file

	-- Write the dictionary itself
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  dict_next <- readFastMutInt dict_next_ref
  dict_map  <- readIORef dict_map_ref
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  putDictionary bh dict_next dict_map
  debugTraceMsg dflags 3 (text "writeBinIface:" <+> int dict_next
                                 <+> text "dict entries")

	-- And send the result to the file
  writeBinMem bh hi_path

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initBinMemSize :: Int
initBinMemSize = 1024 * 1024
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-- The *host* architecture version:
#include "MachDeps.h"

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binaryInterfaceMagic :: Word32
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#if   WORD_SIZE_IN_BITS == 32
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binaryInterfaceMagic = 0x1face
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#elif WORD_SIZE_IN_BITS == 64
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binaryInterfaceMagic = 0x1face64
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#endif
  
-- -----------------------------------------------------------------------------
-- The symbol table

putSymbolTable :: BinHandle -> Int -> UniqFM (Int,Name) -> IO ()
putSymbolTable bh next_off symtab = do
  put_ bh next_off
  let names = elems (array (0,next_off-1) (eltsUFM symtab))
  mapM_ (\n -> serialiseName bh n symtab) names

getSymbolTable :: BinHandle -> NameCache -> IO (NameCache, Array Int Name)
getSymbolTable bh namecache = do
  sz <- get bh
  od_names <- sequence (replicate sz (get bh))
  let 
        arr = listArray (0,sz-1) names
        (namecache', names) =    
                mapAccumR (fromOnDiskName arr) namecache od_names
  --
  return (namecache', arr)

type OnDiskName = (PackageId, ModuleName, OccName)

fromOnDiskName
   :: Array Int Name
   -> NameCache
   -> OnDiskName
   -> (NameCache, Name)
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fromOnDiskName _ nc (pid, mod_name, occ) =
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  let 
        mod   = mkModule pid mod_name
        cache = nsNames nc
  in
  case lookupOrigNameCache cache  mod occ of
     Just name -> (nc, name)
     Nothing   -> 
        let 
                us        = nsUniqs nc
                uniq      = uniqFromSupply us
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                name      = mkExternalName uniq mod occ noSrcSpan
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                new_cache = extendNameCache cache mod occ name
        in        
        case splitUniqSupply us of { (us',_) -> 
        ( nc{ nsUniqs = us', nsNames = new_cache }, name )
        }

serialiseName :: BinHandle -> Name -> UniqFM (Int,Name) -> IO ()
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serialiseName bh name _ = do
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  let mod = nameModule name
  put_ bh (modulePackageId mod, moduleName mod, nameOccName name)

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putName :: BinSymbolTable -> BinHandle -> Name -> IO ()
putName BinSymbolTable{ 
            bin_symtab_map = symtab_map_ref,
            bin_symtab_next = symtab_next }    bh name
  = do
    symtab_map <- readIORef symtab_map_ref
    case lookupUFM symtab_map name of
      Just (off,_) -> put_ bh off
      Nothing -> do
         off <- readFastMutInt symtab_next
         writeFastMutInt symtab_next (off+1)
         writeIORef symtab_map_ref
             $! addToUFM symtab_map name (off,name)
         put_ bh off          


data BinSymbolTable = BinSymbolTable {
        bin_symtab_next :: !FastMutInt, -- The next index to use
        bin_symtab_map  :: !(IORef (UniqFM (Int,Name)))
                                -- indexed by Name
  }


putFastString :: BinDictionary -> BinHandle -> FastString -> IO ()
putFastString BinDictionary { bin_dict_next = j_r,
                              bin_dict_map  = out_r}  bh f
  = do
    out <- readIORef out_r
    let uniq = getUnique f
    case lookupUFM out uniq of
        Just (j, _)  -> put_ bh j
        Nothing -> do
           j <- readFastMutInt j_r
           put_ bh j
           writeFastMutInt j_r (j + 1)
           writeIORef out_r $! addToUFM out uniq (j, f)


data BinDictionary = BinDictionary {
        bin_dict_next :: !FastMutInt, -- The next index to use
        bin_dict_map  :: !(IORef (UniqFM (Int,FastString)))
                                -- indexed by FastString
  }

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-- -----------------------------------------------------------------------------
-- All the binary instances
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-- BasicTypes
{-! for IPName derive: Binary !-}
{-! for Fixity derive: Binary !-}
{-! for FixityDirection derive: Binary !-}
{-! for Boxity derive: Binary !-}
{-! for StrictnessMark derive: Binary !-}
{-! for Activation derive: Binary !-}

-- NewDemand
{-! for Demand derive: Binary !-}
{-! for Demands derive: Binary !-}
{-! for DmdResult derive: Binary !-}
{-! for StrictSig derive: Binary !-}

-- Class
{-! for DefMeth derive: Binary !-}

-- HsTypes
{-! for HsPred derive: Binary !-}
{-! for HsType derive: Binary !-}
{-! for TupCon derive: Binary !-}
{-! for HsTyVarBndr derive: Binary !-}

-- HsCore
{-! for UfExpr derive: Binary !-}
{-! for UfConAlt derive: Binary !-}
{-! for UfBinding derive: Binary !-}
{-! for UfBinder derive: Binary !-}
{-! for HsIdInfo derive: Binary !-}
{-! for UfNote derive: Binary !-}

-- HsDecls
{-! for ConDetails derive: Binary !-}
{-! for BangType derive: Binary !-}

-- CostCentre
{-! for IsCafCC derive: Binary !-}
{-! for IsDupdCC derive: Binary !-}
{-! for CostCentre derive: Binary !-}



-- ---------------------------------------------------------------------------
-- Reading a binary interface into ParsedIface

instance Binary ModIface where
   put_ bh (ModIface {
		 mi_module    = mod,
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		 mi_boot      = is_boot,
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		 mi_iface_hash= iface_hash,
		 mi_mod_hash  = mod_hash,
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		 mi_orphan    = orphan,
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		 mi_finsts    = hasFamInsts,
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		 mi_deps      = deps,
		 mi_usages    = usages,
		 mi_exports   = exports,
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		 mi_exp_hash  = exp_hash,
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		 mi_fixities  = fixities,
		 mi_deprecs   = deprecs,
		 mi_decls     = decls,
		 mi_insts     = insts,
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		 mi_fam_insts = fam_insts,
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		 mi_rules     = rules,
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		 mi_orphan_hash = orphan_hash,
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                 mi_vect_info = vect_info,
		 mi_hpc       = hpc_info }) = do
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	put_ bh mod
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	put_ bh is_boot
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	put_ bh iface_hash
	put_ bh mod_hash
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	put_ bh orphan
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	put_ bh hasFamInsts
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	lazyPut bh deps
	lazyPut bh usages
	put_ bh exports
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	put_ bh exp_hash
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	put_ bh fixities
	lazyPut bh deprecs
        put_ bh decls
	put_ bh insts
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	put_ bh fam_insts
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	lazyPut bh rules
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	put_ bh orphan_hash
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        put_ bh vect_info
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	put_ bh hpc_info
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   get bh = do
	mod_name  <- get bh
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	is_boot   <- get bh
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	iface_hash <- get bh
	mod_hash  <- get bh
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	orphan    <- get bh
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	hasFamInsts <- get bh
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	deps	  <- lazyGet bh
	usages	  <- {-# SCC "bin_usages" #-} lazyGet bh
	exports	  <- {-# SCC "bin_exports" #-} get bh
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	exp_hash  <- get bh
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	fixities  <- {-# SCC "bin_fixities" #-} get bh
	deprecs   <- {-# SCC "bin_deprecs" #-} lazyGet bh
        decls 	  <- {-# SCC "bin_tycldecls" #-} get bh
	insts     <- {-# SCC "bin_insts" #-} get bh
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	fam_insts <- {-# SCC "bin_fam_insts" #-} get bh
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	rules	  <- {-# SCC "bin_rules" #-} lazyGet bh
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	orphan_hash <- get bh
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        vect_info <- get bh
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        hpc_info  <- get bh
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	return (ModIface {
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		 mi_module    = mod_name,
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		 mi_boot      = is_boot,
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		 mi_iface_hash = iface_hash,
		 mi_mod_hash  = mod_hash,
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		 mi_orphan    = orphan,
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		 mi_finsts    = hasFamInsts,
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		 mi_deps      = deps,
		 mi_usages    = usages,
		 mi_exports   = exports,
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		 mi_exp_hash  = exp_hash,
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		 mi_fixities  = fixities,
		 mi_deprecs   = deprecs,
		 mi_decls     = decls,
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		 mi_globals   = Nothing,
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		 mi_insts     = insts,
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		 mi_fam_insts = fam_insts,
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		 mi_rules     = rules,
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		 mi_orphan_hash = orphan_hash,
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                 mi_vect_info = vect_info,
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		 mi_hpc       = hpc_info,
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			-- And build the cached values
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		 mi_dep_fn    = mkIfaceDepCache deprecs,
		 mi_fix_fn    = mkIfaceFixCache fixities,
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		 mi_hash_fn   = mkIfaceHashCache decls })
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getWayDescr :: IO String
getWayDescr = do
  tag <- readIORef v_Build_tag
  if cGhcUnregisterised == "YES" then return ('u':tag) else return tag
	-- if this is an unregisterised build, make sure our interfaces
	-- can't be used by a registerised build.

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-------------------------------------------------------------------------
--		Types from: HscTypes
-------------------------------------------------------------------------

instance Binary Dependencies where
    put_ bh deps = do put_ bh (dep_mods deps)
		      put_ bh (dep_pkgs deps)
		      put_ bh (dep_orphs deps)
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		      put_ bh (dep_finsts deps)
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    get bh = do ms <- get bh 
		ps <- get bh
		os <- get bh
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		fis <- get bh
		return (Deps { dep_mods = ms, dep_pkgs = ps, dep_orphs = os,
			       dep_finsts = fis })
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instance (Binary name) => Binary (GenAvailInfo name) where
    put_ bh (Avail aa) = do
	    putByte bh 0
	    put_ bh aa
    put_ bh (AvailTC ab ac) = do
	    putByte bh 1
	    put_ bh ab
	    put_ bh ac
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do aa <- get bh
		      return (Avail aa)
	      _ -> do ab <- get bh
		      ac <- get bh
		      return (AvailTC ab ac)

instance Binary Usage where
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    put_ bh usg@UsagePackageModule{} = do 
        putByte bh 0
	put_ bh (usg_mod usg)
	put_ bh (usg_mod_hash usg)
    put_ bh usg@UsageHomeModule{} = do 
        putByte bh 1
	put_ bh (usg_mod_name usg)
	put_ bh (usg_mod_hash usg)
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	put_ bh (usg_exports  usg)
	put_ bh (usg_entities usg)

    get bh = do
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        h <- getByte bh
        case h of
          0 -> do
            nm    <- get bh
            mod   <- get bh
            return UsagePackageModule { usg_mod = nm, usg_mod_hash = mod }
          _ -> do
            nm    <- get bh
            mod   <- get bh
            exps  <- get bh
            ents  <- get bh
            return UsageHomeModule { usg_mod_name = nm, usg_mod_hash = mod,
                            usg_exports = exps, usg_entities = ents }
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instance Binary Deprecations where
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    put_ bh NoDeprecs     = putByte bh 0
    put_ bh (DeprecAll t) = do
	    putByte bh 1
	    put_ bh t
    put_ bh (DeprecSome ts) = do
	    putByte bh 2
	    put_ bh ts

    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> return NoDeprecs
	      1 -> do aa <- get bh
		      return (DeprecAll aa)
	      _ -> do aa <- get bh
		      return (DeprecSome aa)

-------------------------------------------------------------------------
--		Types from: BasicTypes
-------------------------------------------------------------------------

instance Binary Activation where
    put_ bh NeverActive = do
	    putByte bh 0
    put_ bh AlwaysActive = do
	    putByte bh 1
    put_ bh (ActiveBefore aa) = do
	    putByte bh 2
	    put_ bh aa
    put_ bh (ActiveAfter ab) = do
	    putByte bh 3
	    put_ bh ab
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do return NeverActive
	      1 -> do return AlwaysActive
	      2 -> do aa <- get bh
		      return (ActiveBefore aa)
	      _ -> do ab <- get bh
		      return (ActiveAfter ab)

instance Binary StrictnessMark where
    put_ bh MarkedStrict = do
	    putByte bh 0
    put_ bh MarkedUnboxed = do
	    putByte bh 1
    put_ bh NotMarkedStrict = do
	    putByte bh 2
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do return MarkedStrict
	      1 -> do return MarkedUnboxed
	      _ -> do return NotMarkedStrict

instance Binary Boxity where
    put_ bh Boxed = do
	    putByte bh 0
    put_ bh Unboxed = do
	    putByte bh 1
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do return Boxed
	      _ -> do return Unboxed

instance Binary TupCon where
    put_ bh (TupCon ab ac) = do
	    put_ bh ab
	    put_ bh ac
    get bh = do
	  ab <- get bh
	  ac <- get bh
	  return (TupCon ab ac)

instance Binary RecFlag where
    put_ bh Recursive = do
	    putByte bh 0
    put_ bh NonRecursive = do
	    putByte bh 1
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do return Recursive
	      _ -> do return NonRecursive

instance Binary DefMeth where
    put_ bh NoDefMeth  = putByte bh 0
    put_ bh DefMeth    = putByte bh 1
    put_ bh GenDefMeth = putByte bh 2
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> return NoDefMeth
	      1 -> return DefMeth
	      _ -> return GenDefMeth

instance Binary FixityDirection where
    put_ bh InfixL = do
	    putByte bh 0
    put_ bh InfixR = do
	    putByte bh 1
    put_ bh InfixN = do
	    putByte bh 2
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do return InfixL
	      1 -> do return InfixR
	      _ -> do return InfixN

instance Binary Fixity where
    put_ bh (Fixity aa ab) = do
	    put_ bh aa
	    put_ bh ab
    get bh = do
	  aa <- get bh
	  ab <- get bh
	  return (Fixity aa ab)

instance (Binary name) => Binary (IPName name) where
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    put_ bh (IPName aa) = put_ bh aa
    get bh = do aa <- get bh
	        return (IPName aa)
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-------------------------------------------------------------------------
--		Types from: Demand
-------------------------------------------------------------------------

instance Binary DmdType where
	-- Ignore DmdEnv when spitting out the DmdType
  put bh (DmdType _ ds dr) = do p <- put bh ds; put bh dr; return (castBin p)
  get bh = do ds <- get bh; dr <- get bh; return (DmdType emptyVarEnv ds dr)

instance Binary Demand where
    put_ bh Top = do
	    putByte bh 0
    put_ bh Abs = do
	    putByte bh 1
    put_ bh (Call aa) = do
	    putByte bh 2
	    put_ bh aa
    put_ bh (Eval ab) = do
	    putByte bh 3
	    put_ bh ab
    put_ bh (Defer ac) = do
	    putByte bh 4
	    put_ bh ac
    put_ bh (Box ad) = do
	    putByte bh 5
	    put_ bh ad
    put_ bh Bot = do
	    putByte bh 6
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do return Top
	      1 -> do return Abs
	      2 -> do aa <- get bh
		      return (Call aa)
	      3 -> do ab <- get bh
		      return (Eval ab)
	      4 -> do ac <- get bh
		      return (Defer ac)
	      5 -> do ad <- get bh
		      return (Box ad)
	      _ -> do return Bot

instance Binary Demands where
    put_ bh (Poly aa) = do
	    putByte bh 0
	    put_ bh aa
    put_ bh (Prod ab) = do
	    putByte bh 1
	    put_ bh ab
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do aa <- get bh
		      return (Poly aa)
	      _ -> do ab <- get bh
		      return (Prod ab)

instance Binary DmdResult where
    put_ bh TopRes = do
	    putByte bh 0
    put_ bh RetCPR = do
	    putByte bh 1
    put_ bh BotRes = do
	    putByte bh 2
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do return TopRes
	      1 -> do return RetCPR	-- Really use RetCPR even if -fcpr-off
					-- The wrapper was generated for CPR in 
					-- the imported module!
	      _ -> do return BotRes

instance Binary StrictSig where
    put_ bh (StrictSig aa) = do
	    put_ bh aa
    get bh = do
	  aa <- get bh
	  return (StrictSig aa)


-------------------------------------------------------------------------
--		Types from: CostCentre
-------------------------------------------------------------------------

instance Binary IsCafCC where
    put_ bh CafCC = do
	    putByte bh 0
    put_ bh NotCafCC = do
	    putByte bh 1
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do return CafCC
	      _ -> do return NotCafCC

instance Binary IsDupdCC where
    put_ bh OriginalCC = do
	    putByte bh 0
    put_ bh DupdCC = do
	    putByte bh 1
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do return OriginalCC
	      _ -> do return DupdCC

instance Binary CostCentre where
    put_ bh NoCostCentre = do
	    putByte bh 0
    put_ bh (NormalCC aa ab ac ad) = do
	    putByte bh 1
	    put_ bh aa
	    put_ bh ab
	    put_ bh ac
	    put_ bh ad
    put_ bh (AllCafsCC ae) = do
	    putByte bh 2
	    put_ bh ae
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do return NoCostCentre
	      1 -> do aa <- get bh
		      ab <- get bh
		      ac <- get bh
		      ad <- get bh
		      return (NormalCC aa ab ac ad)
	      _ -> do ae <- get bh
		      return (AllCafsCC ae)

-------------------------------------------------------------------------
--		IfaceTypes and friends
-------------------------------------------------------------------------

instance Binary IfaceBndr where
    put_ bh (IfaceIdBndr aa) = do
	    putByte bh 0
	    put_ bh aa
    put_ bh (IfaceTvBndr ab) = do
	    putByte bh 1
	    put_ bh ab
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do aa <- get bh
		      return (IfaceIdBndr aa)
	      _ -> do ab <- get bh
		      return (IfaceTvBndr ab)

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instance Binary IfaceLetBndr where
    put_ bh (IfLetBndr a b c) = do
	    put_ bh a
	    put_ bh b
	    put_ bh c
    get bh = do a <- get bh
	        b <- get bh
	        c <- get bh
		return (IfLetBndr a b c)	   

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instance Binary IfaceType where
    put_ bh (IfaceForAllTy aa ab) = do
	    putByte bh 0
	    put_ bh aa
	    put_ bh ab
    put_ bh (IfaceTyVar ad) = do
	    putByte bh 1
	    put_ bh ad
    put_ bh (IfaceAppTy ae af) = do
	    putByte bh 2
	    put_ bh ae
	    put_ bh af
    put_ bh (IfaceFunTy ag ah) = do
	    putByte bh 3
	    put_ bh ag
	    put_ bh ah
    put_ bh (IfacePredTy aq) = do
	    putByte bh 5
	    put_ bh aq

	-- Simple compression for common cases of TyConApp
    put_ bh (IfaceTyConApp IfaceIntTc  [])   = putByte bh 6
    put_ bh (IfaceTyConApp IfaceCharTc [])   = putByte bh 7
    put_ bh (IfaceTyConApp IfaceBoolTc [])   = putByte bh 8
    put_ bh (IfaceTyConApp IfaceListTc [ty]) = do { putByte bh 9; put_ bh ty }
	-- Unit tuple and pairs
    put_ bh (IfaceTyConApp (IfaceTupTc Boxed 0) []) 	 = putByte bh 10
    put_ bh (IfaceTyConApp (IfaceTupTc Boxed 2) [t1,t2]) = do { putByte bh 11; put_ bh t1; put_ bh t2 }
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        -- Kind cases
    put_ bh (IfaceTyConApp IfaceLiftedTypeKindTc [])   = putByte bh 12
    put_ bh (IfaceTyConApp IfaceOpenTypeKindTc [])     = putByte bh 13
    put_ bh (IfaceTyConApp IfaceUnliftedTypeKindTc []) = putByte bh 14
    put_ bh (IfaceTyConApp IfaceUbxTupleKindTc [])     = putByte bh 15
    put_ bh (IfaceTyConApp IfaceArgTypeKindTc [])      = putByte bh 16

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	-- Generic cases
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    put_ bh (IfaceTyConApp (IfaceTc tc) tys) = do { putByte bh 18; put_ bh tc; put_ bh tys }
    put_ bh (IfaceTyConApp tc tys) 	     = do { putByte bh 19; put_ bh tc; put_ bh tys }
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    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do aa <- get bh
		      ab <- get bh
		      return (IfaceForAllTy aa ab)
	      1 -> do ad <- get bh
		      return (IfaceTyVar ad)
	      2 -> do ae <- get bh
		      af <- get bh
		      return (IfaceAppTy ae af)
	      3 -> do ag <- get bh
		      ah <- get bh
		      return (IfaceFunTy ag ah)
	      5 -> do ap <- get bh
		      return (IfacePredTy ap)

		-- Now the special cases for TyConApp
	      6 -> return (IfaceTyConApp IfaceIntTc [])
	      7 -> return (IfaceTyConApp IfaceCharTc [])
	      8 -> return (IfaceTyConApp IfaceBoolTc [])
	      9 -> do { ty <- get bh; return (IfaceTyConApp IfaceListTc [ty]) }
	      10 -> return (IfaceTyConApp (IfaceTupTc Boxed 0) [])
	      11 -> do { t1 <- get bh; t2 <- get bh; return (IfaceTyConApp (IfaceTupTc Boxed 2) [t1,t2]) }
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              12 -> return (IfaceTyConApp IfaceLiftedTypeKindTc [])
              13 -> return (IfaceTyConApp IfaceOpenTypeKindTc [])
              14 -> return (IfaceTyConApp IfaceUnliftedTypeKindTc [])
              15 -> return (IfaceTyConApp IfaceUbxTupleKindTc [])
              16 -> return (IfaceTyConApp IfaceArgTypeKindTc [])

	      18 -> do { tc <- get bh; tys <- get bh; return (IfaceTyConApp (IfaceTc tc) tys) }
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	      _  -> do { tc <- get bh; tys <- get bh; return (IfaceTyConApp tc tys) }

instance Binary IfaceTyCon where
	-- Int,Char,Bool can't show up here because they can't not be saturated
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   put_ bh IfaceIntTc  	      = putByte bh 1
   put_ bh IfaceBoolTc 	      = putByte bh 2
   put_ bh IfaceCharTc 	      = putByte bh 3
   put_ bh IfaceListTc 	      = putByte bh 4
   put_ bh IfacePArrTc 	      = putByte bh 5
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   put_ bh IfaceLiftedTypeKindTc   = putByte bh 6
   put_ bh IfaceOpenTypeKindTc     = putByte bh 7
   put_ bh IfaceUnliftedTypeKindTc = putByte bh 8
   put_ bh IfaceUbxTupleKindTc     = putByte bh 9
   put_ bh IfaceArgTypeKindTc      = putByte bh 10
   put_ bh (IfaceTupTc bx ar) = do { putByte bh 11; put_ bh bx; put_ bh ar }
   put_ bh (IfaceTc ext)      = do { putByte bh 12; put_ bh ext }
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   get bh = do
	h <- getByte bh
	case h of
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	  1 -> return IfaceIntTc
	  2 -> return IfaceBoolTc
	  3 -> return IfaceCharTc
	  4 -> return IfaceListTc
	  5 -> return IfacePArrTc
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          6 -> return IfaceLiftedTypeKindTc 
          7 -> return IfaceOpenTypeKindTc 
          8 -> return IfaceUnliftedTypeKindTc
          9 -> return IfaceUbxTupleKindTc
          10 -> return IfaceArgTypeKindTc
	  11 -> do { bx <- get bh; ar <- get bh; return (IfaceTupTc bx ar) }
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	  _ -> do { ext <- get bh; return (IfaceTc ext) }
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instance Binary IfacePredType where
    put_ bh (IfaceClassP aa ab) = do
	    putByte bh 0
	    put_ bh aa
	    put_ bh ab
    put_ bh (IfaceIParam ac ad) = do
	    putByte bh 1
	    put_ bh ac
	    put_ bh ad
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    put_ bh (IfaceEqPred ac ad) = do
	    putByte bh 2
	    put_ bh ac
	    put_ bh ad
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    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do aa <- get bh
		      ab <- get bh
		      return (IfaceClassP aa ab)
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	      1 -> do ac <- get bh
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		      ad <- get bh
		      return (IfaceIParam ac ad)
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	      2 -> do ac <- get bh
		      ad <- get bh
		      return (IfaceEqPred ac ad)
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	      _ -> panic ("get IfacePredType " ++ show h)
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-------------------------------------------------------------------------
--		IfaceExpr and friends
-------------------------------------------------------------------------

instance Binary IfaceExpr where
    put_ bh (IfaceLcl aa) = do
	    putByte bh 0
	    put_ bh aa
    put_ bh (IfaceType ab) = do
	    putByte bh 1
	    put_ bh ab
    put_ bh (IfaceTuple ac ad) = do
	    putByte bh 2
	    put_ bh ac
	    put_ bh ad
    put_ bh (IfaceLam ae af) = do
	    putByte bh 3
	    put_ bh ae
	    put_ bh af
    put_ bh (IfaceApp ag ah) = do
	    putByte bh 4
	    put_ bh ag
	    put_ bh ah
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-- gaw 2004
    put_ bh (IfaceCase ai aj al ak) = do
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	    putByte bh 5
	    put_ bh ai
	    put_ bh aj
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            put_ bh al
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	    put_ bh ak
    put_ bh (IfaceLet al am) = do
	    putByte bh 6
	    put_ bh al
	    put_ bh am
    put_ bh (IfaceNote an ao) = do
	    putByte bh 7
	    put_ bh an
	    put_ bh ao
    put_ bh (IfaceLit ap) = do
	    putByte bh 8
	    put_ bh ap
    put_ bh (IfaceFCall as at) = do
	    putByte bh 9
	    put_ bh as
	    put_ bh at
    put_ bh (IfaceExt aa) = do
	    putByte bh 10
	    put_ bh aa
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    put_ bh (IfaceCast ie ico) = do
            putByte bh 11
            put_ bh ie
            put_ bh ico
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    put_ bh (IfaceTick m ix) = do
            putByte bh 12
            put_ bh m
            put_ bh ix
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    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do aa <- get bh
		      return (IfaceLcl aa)
	      1 -> do ab <- get bh
		      return (IfaceType ab)
	      2 -> do ac <- get bh
		      ad <- get bh
		      return (IfaceTuple ac ad)
	      3 -> do ae <- get bh
		      af <- get bh
		      return (IfaceLam ae af)
	      4 -> do ag <- get bh
		      ah <- get bh
		      return (IfaceApp ag ah)
	      5 -> do ai <- get bh
		      aj <- get bh
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-- gaw 2004
                      al <- get bh                   
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		      ak <- get bh
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		      return (IfaceCase ai aj al ak)
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	      6 -> do al <- get bh
		      am <- get bh
		      return (IfaceLet al am)
	      7 -> do an <- get bh
		      ao <- get bh
		      return (IfaceNote an ao)
	      8 -> do ap <- get bh
		      return (IfaceLit ap)
	      9 -> do as <- get bh
		      at <- get bh
		      return (IfaceFCall as at)
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	      10 -> do aa <- get bh
		       return (IfaceExt aa)
              11 -> do ie <- get bh
                       ico <- get bh
                       return (IfaceCast ie ico)
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              12 -> do m <- get bh
                       ix <- get bh
                       return (IfaceTick m ix)
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              _ -> panic ("get IfaceExpr " ++ show h)
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instance Binary IfaceConAlt where
    put_ bh IfaceDefault = do
	    putByte bh 0
    put_ bh (IfaceDataAlt aa) = do
	    putByte bh 1
	    put_ bh aa
    put_ bh (IfaceTupleAlt ab) = do
	    putByte bh 2
	    put_ bh ab
    put_ bh (IfaceLitAlt ac) = do
	    putByte bh 3
	    put_ bh ac
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do return IfaceDefault
	      1 -> do aa <- get bh
		      return (IfaceDataAlt aa)
	      2 -> do ab <- get bh
		      return (IfaceTupleAlt ab)
	      _ -> do ac <- get bh
		      return (IfaceLitAlt ac)

instance Binary IfaceBinding where
    put_ bh (IfaceNonRec aa ab) = do
	    putByte bh 0
	    put_ bh aa
	    put_ bh ab
    put_ bh (IfaceRec ac) = do
	    putByte bh 1
	    put_ bh ac
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do aa <- get bh
		      ab <- get bh
		      return (IfaceNonRec aa ab)
	      _ -> do ac <- get bh
		      return (IfaceRec ac)

instance Binary IfaceIdInfo where
    put_ bh NoInfo = putByte bh 0
    put_ bh (HasInfo i) = do
	    putByte bh 1
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	    lazyPut bh i			-- NB lazyPut
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    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> return NoInfo
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	      _ -> do info <- lazyGet bh	-- NB lazyGet
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		      return (HasInfo info)

instance Binary IfaceInfoItem where
    put_ bh (HsArity aa) = do
	    putByte bh 0
	    put_ bh aa
    put_ bh (HsStrictness ab) = do
	    putByte bh 1
	    put_ bh ab
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    put_ bh (HsUnfold ad) = do
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	    putByte bh 2
	    put_ bh ad
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    put_ bh (HsInline ad) = do
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	    putByte bh 3
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	    put_ bh ad
    put_ bh HsNoCafRefs = do
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	    putByte bh 4
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    put_ bh (HsWorker ae af) = do
	    putByte bh 5
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	    put_ bh ae
	    put_ bh af
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do aa <- get bh
		      return (HsArity aa)
	      1 -> do ab <- get bh
		      return (HsStrictness ab)
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	      2 -> do ad <- get bh
		      return (HsUnfold ad)
	      3 -> do ad <- get bh
		      return (HsInline ad)
	      4 -> do return HsNoCafRefs
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	      _ -> do ae <- get bh
		      af <- get bh
		      return (HsWorker ae af)

instance Binary IfaceNote where
    put_ bh (IfaceSCC aa) = do
	    putByte bh 0
	    put_ bh aa
    put_ bh IfaceInlineMe = do
	    putByte bh 3
    put_ bh (IfaceCoreNote s) = do
            putByte bh 4
            put_ bh s
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do aa <- get bh
		      return (IfaceSCC aa)
	      3 -> do return IfaceInlineMe
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              4 -> do ac <- get bh
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                      return (IfaceCoreNote ac)
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              _ -> panic ("get IfaceNote " ++ show h)
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-------------------------------------------------------------------------
--		IfaceDecl and friends
-------------------------------------------------------------------------

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-- A bit of magic going on here: there's no need to store the OccName
-- for a decl on the disk, since we can infer the namespace from the
-- context; however it is useful to have the OccName in the IfaceDecl
-- to avoid re-building it in various places.  So we build the OccName
-- when de-serialising.

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instance Binary IfaceDecl where
    put_ bh (IfaceId name ty idinfo) = do
	    putByte bh 0
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	    put_ bh (occNameFS name)
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	    put_ bh ty
	    put_ bh idinfo
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    put_ _ (IfaceForeign _ _) = 
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	error "Binary.put_(IfaceDecl): IfaceForeign"
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    put_ bh (IfaceData a1 a2 a3 a4 a5 a6 a7 a8) = do
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	    putByte bh 2
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	    put_ bh (occNameFS a1)
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	    put_ bh a2
	    put_ bh a3
	    put_ bh a4
	    put_ bh a5
	    put_ bh a6
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	    put_ bh a7
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	    put_ bh a8
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    put_ bh (IfaceSyn a1 a2 a3 a4 a5) = do
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	    putByte bh 3
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	    put_ bh (occNameFS a1)
	    put_ bh a2
	    put_ bh a3
	    put_ bh a4
	    put_ bh a5
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    put_ bh (IfaceClass a1 a2 a3 a4 a5 a6 a7) = do
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	    putByte bh 4
	    put_ bh a1
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	    put_ bh (occNameFS a2)
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	    put_ bh a3
	    put_ bh a4
	    put_ bh a5
	    put_ bh a6
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	    put_ bh a7
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    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> do name   <- get bh
		      ty     <- get bh
		      idinfo <- get bh
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                      occ <- return $! mkOccNameFS varName name
		      return (IfaceId occ ty idinfo)
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	      1 -> error "Binary.get(TyClDecl): ForeignType"
	      2 -> do
		    a1 <- get bh
		    a2 <- get bh
		    a3 <- get bh
		    a4 <- get bh
		    a5 <- get bh
		    a6 <- get bh
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		    a7 <- get bh
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		    a8 <- get bh
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                    occ <- return $! mkOccNameFS tcName a1
		    return (IfaceData occ a2 a3 a4 a5 a6 a7 a8)
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	      3 -> do
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		    a1 <- get bh
		    a2 <- get bh
		    a3 <- get bh
		    a4 <- get bh
		    a5 <- get bh
                    occ <- return $! mkOccNameFS tcName a1
		    return (IfaceSyn occ a2 a3 a4 a5)
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	      _ -> do
		    a1 <- get bh
		    a2 <- get bh
		    a3 <- get bh
		    a4 <- get bh
		    a5 <- get bh
		    a6 <- get bh
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		    a7 <- get bh
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                    occ <- return $! mkOccNameFS clsName a2
		    return (IfaceClass a1 occ a3 a4 a5 a6 a7)
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instance Binary IfaceInst where
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    put_ bh (IfaceInst cls tys dfun flag orph) = do
	    put_ bh cls
	    put_ bh tys
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	    put_ bh dfun
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	    put_ bh flag
	    put_ bh orph
    get bh = do cls  <- get bh
		tys  <- get bh
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		dfun <- get bh
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		flag <- get bh
		orph <- get bh
		return (IfaceInst cls tys dfun flag orph)

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instance Binary IfaceFamInst where
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    put_ bh (IfaceFamInst fam tys tycon) = do
	    put_ bh fam
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	    put_ bh tys
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	    put_ bh tycon
    get bh = do fam   <- get bh
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		tys   <- get bh
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		tycon <- get bh
		return (IfaceFamInst fam tys tycon)
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instance Binary OverlapFlag where
    put_ bh NoOverlap  = putByte bh 0
    put_ bh OverlapOk  = putByte bh 1
    put_ bh Incoherent = putByte bh 2
    get bh = do h <- getByte bh
		case h of
		  0 -> return NoOverlap
		  1 -> return OverlapOk
		  2 -> return Incoherent
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		  _ -> panic ("get OverlapFlag " ++ show h)
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instance Binary IfaceConDecls where
    put_ bh IfAbstractTyCon = putByte bh 0
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    put_ bh IfOpenDataTyCon = putByte bh 1
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    put_ bh (IfDataTyCon cs) = do { putByte bh 2
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				  ; put_ bh cs }
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    put_ bh (IfNewTyCon c)  = do { putByte bh 3
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				  ; put_ bh c }
    get bh = do
	    h <- getByte bh
	    case h of
	      0 -> return IfAbstractTyCon
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	      1 -> return IfOpenDataTyCon
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	      2 -> do cs <- get bh
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		      return (IfDataTyCon cs)
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	      _ -> do aa <- get bh
		      return (IfNewTyCon aa)

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instance Binary IfaceConDecl where
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    put_ bh (IfCon a1 a2 a3 a4 a5 a6 a7 a8 a9) = do
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	    put_ bh a1
	    put_ bh a2
	    put_ bh a3
	    put_ bh a4
	    put_ bh a5
	    put_ bh a6
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	    put_ bh a7
	    put_ bh a8
	    put_ bh a9
    get bh = do a1 <- get bh
		a2 <- get bh
		a3 <- get bh	      
		a4 <- get bh
		a5 <- get bh
		a6 <- get bh
		a7 <- get bh
		a8 <- get bh
		a9 <- get bh
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	        return (IfCon a1 a2 a3 a4 a5 a6 a7 a8 a9)
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instance Binary IfaceClassOp where
   put_ bh (IfaceClassOp n def ty) = do	
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	put_ bh (occNameFS n)
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	put_ bh def	
	put_ bh ty
   get bh = do
	n <- get bh
	def <- get bh
	ty <- get bh
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        occ <- return $! mkOccNameFS varName n
	return (IfaceClassOp occ def ty)
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instance Binary IfaceRule where
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    put_ bh (IfaceRule a1 a2 a3 a4 a5 a6 a7) = do
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	    put_ bh a1
	    put_ bh a2
	    put_ bh a3
	    put_ bh a4
	    put_ bh a5
	    put_ bh a6
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	    put_ bh a7
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    get bh = do
	    a1 <- get bh
	    a2 <- get bh
	    a3 <- get bh
	    a4 <- get bh
	    a5 <- get bh
	    a6 <- get bh
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	    a7 <- get bh
	    return (IfaceRule a1 a2 a3 a4 a5 a6 a7)
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instance Binary IfaceVectInfo where
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    put_ bh (IfaceVectInfo a1 a2 a3) = do
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	    put_ bh a1
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	    put_ bh a2
	    put_ bh a3
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    get bh = do
	    a1 <- get bh
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	    a2 <- get bh
	    a3 <- get bh
	    return (IfaceVectInfo a1 a2 a3)
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