X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fiface%2FIfaceEnv.lhs;h=84a6474077ada74fa9b8836cdcf9216af9e30267;hp=3176c6add1d1c77b87a239a735da0f6de3e5a1bb;hb=7fc01c4671980ea3c66d549c0ece4d82fd3f5ade;hpb=ad94d40948668032189ad22a0ad741ac1f645f50 diff --git a/compiler/iface/IfaceEnv.lhs b/compiler/iface/IfaceEnv.lhs index 3176c6a..84a6474 100644 --- a/compiler/iface/IfaceEnv.lhs +++ b/compiler/iface/IfaceEnv.lhs @@ -1,27 +1,20 @@ (c) The University of Glasgow 2002-2006 \begin{code} -{-# OPTIONS -w #-} --- The above warning supression flag is a temporary kludge. --- While working on this module you are encouraged to remove it and fix --- any warnings in the module. See --- http://hackage.haskell.org/trac/ghc/wiki/CodingStyle#Warnings --- for details - module IfaceEnv ( newGlobalBinder, newIPName, newImplicitBinder, lookupIfaceTop, lookupOrig, lookupOrigNameCache, extendNameCache, newIfaceName, newIfaceNames, extendIfaceIdEnv, extendIfaceTyVarEnv, - tcIfaceLclId, tcIfaceTyVar, + tcIfaceLclId, tcIfaceTyVar, lookupIfaceTyVar, tcIfaceTick, ifaceExportNames, -- Name-cache stuff allocateGlobalBinder, initNameCache, - getNameCache, setNameCache + getNameCache, mkNameCacheUpdater, NameCacheUpdater ) where #include "HsVersions.h" @@ -33,7 +26,6 @@ import TyCon import DataCon import Var import Name -import OccName import PrelNames import Module import UniqFM @@ -45,6 +37,9 @@ import SrcLoc import MkId import Outputable +import Exception ( evaluate ) + +import Data.IORef ( atomicModifyIORef, readIORef ) \end{code} @@ -64,14 +59,10 @@ newGlobalBinder :: Module -> OccName -> SrcSpan -> TcRnIf a b Name -- moment when we know its Module and SrcLoc in their full glory newGlobalBinder mod occ loc - = do { mod `seq` occ `seq` return () -- See notes with lookupOrig_help --- ; traceIf (text "newGlobalBinder" <+> ppr mod <+> ppr occ <+> ppr loc) - ; name_supply <- getNameCache - ; let (name_supply', name) = allocateGlobalBinder - name_supply mod occ - loc - ; setNameCache name_supply' - ; return name } + = do mod `seq` occ `seq` return () -- See notes with lookupOrig +-- traceIf (text "newGlobalBinder" <+> ppr mod <+> ppr occ <+> ppr loc) + updNameCache $ \name_cache -> + allocateGlobalBinder name_cache mod occ loc allocateGlobalBinder :: NameCache @@ -121,9 +112,16 @@ newImplicitBinder :: Name -- Base name -- For source type/class decls, this is the first occurrence -- For iface ones, the LoadIface has alrady allocated a suitable name in the cache newImplicitBinder base_name mk_sys_occ - = newGlobalBinder (nameModule base_name) - (mk_sys_occ (nameOccName base_name)) - (nameSrcSpan base_name) + | Just mod <- nameModule_maybe base_name + = newGlobalBinder mod occ loc + | otherwise -- When typechecking a [d| decl bracket |], + -- TH generates types, classes etc with Internal names, + -- so we follow suit for the implicit binders + = do { uniq <- newUnique + ; return (mkInternalName uniq occ loc) } + where + occ = mk_sys_occ (nameOccName base_name) + loc = nameSrcSpan base_name ifaceExportNames :: [IfaceExport] -> TcRnIf gbl lcl [AvailInfo] ifaceExportNames exports = do @@ -139,7 +137,7 @@ lookupAvail mod (AvailTC p_occ occs) = do p_name <- lookupOrig mod p_occ let lookup_sub occ | occ == p_occ = return p_name | otherwise = lookupOrig mod occ - subs <- mappM lookup_sub occs + subs <- mapM lookup_sub occs return (AvailTC p_name subs) -- Remember that 'occs' is all the exported things, including -- the parent. It's possible to export just class ops without @@ -156,10 +154,10 @@ lookupOrig mod occ -- This did happen, with tycon_mod in TcIface.tcIfaceAlt (DataAlt..) mod `seq` occ `seq` return () -- ; traceIf (text "lookup_orig" <+> ppr mod <+> ppr occ) - - ; name_cache <- getNameCache - ; case lookupOrigNameCache (nsNames name_cache) mod occ of { - Just name -> returnM name; + + ; updNameCache $ \name_cache -> + case lookupOrigNameCache (nsNames name_cache) mod occ of { + Just name -> (name_cache, name); Nothing -> let us = nsUniqs name_cache @@ -168,36 +166,38 @@ lookupOrig mod occ new_cache = extendNameCache (nsNames name_cache) mod occ name in case splitUniqSupply us of { (us',_) -> do - setNameCache name_cache{ nsUniqs = us', nsNames = new_cache } - return name + (name_cache{ nsUniqs = us', nsNames = new_cache }, name) }}} newIPName :: IPName OccName -> TcRnIf m n (IPName Name) -newIPName occ_name_ip - = getNameCache `thenM` \ name_supply -> +newIPName occ_name_ip = + updNameCache $ \name_cache -> let - ipcache = nsIPs name_supply + ipcache = nsIPs name_cache + key = occ_name_ip -- Ensures that ?x and %x get distinct Names in case lookupFM ipcache key of - Just name_ip -> returnM name_ip - Nothing -> setNameCache new_ns `thenM_` - returnM name_ip - where - (us', us1) = splitUniqSupply (nsUniqs name_supply) - uniq = uniqFromSupply us1 - name_ip = mapIPName (mkIPName uniq) occ_name_ip - new_ipcache = addToFM ipcache key name_ip - new_ns = name_supply {nsUniqs = us', nsIPs = new_ipcache} - where - key = occ_name_ip -- Ensures that ?x and %x get distinct Names + Just name_ip -> (name_cache, name_ip) + Nothing -> (new_ns, name_ip) + where + (us', us1) = splitUniqSupply (nsUniqs name_cache) + uniq = uniqFromSupply us1 + name_ip = mapIPName (mkIPName uniq) occ_name_ip + new_ipcache = addToFM ipcache key name_ip + new_ns = name_cache {nsUniqs = us', nsIPs = new_ipcache} \end{code} - Local helper functions (not exported) +%************************************************************************ +%* * + Name cache access +%* * +%************************************************************************ \begin{code} lookupOrigNameCache :: OrigNameCache -> Module -> OccName -> Maybe Name -lookupOrigNameCache nc mod occ - | mod == dATA_TUP || mod == gHC_PRIM, -- Boxed tuples from one, +lookupOrigNameCache _ mod occ + -- XXX Why is gHC_UNIT not mentioned here? + | mod == gHC_TUPLE || mod == gHC_PRIM, -- Boxed tuples from one, Just tup_info <- isTupleOcc_maybe occ -- unboxed from the other = -- Special case for tuples; there are too many -- of them to pre-populate the original-name cache @@ -215,7 +215,8 @@ lookupOrigNameCache nc mod occ -- The normal case extendOrigNameCache :: OrigNameCache -> Name -> OrigNameCache extendOrigNameCache nc name - = extendNameCache nc (nameModule name) (nameOccName name) name + = ASSERT2( isExternalName name, ppr name ) + extendNameCache nc (nameModule name) (nameOccName name) name extendNameCache :: OrigNameCache -> Module -> OccName -> Name -> OrigNameCache extendNameCache nc mod occ name @@ -227,9 +228,24 @@ getNameCache :: TcRnIf a b NameCache getNameCache = do { HscEnv { hsc_NC = nc_var } <- getTopEnv; readMutVar nc_var } -setNameCache :: NameCache -> TcRnIf a b () -setNameCache nc = do { HscEnv { hsc_NC = nc_var } <- getTopEnv; - writeMutVar nc_var nc } +updNameCache :: (NameCache -> (NameCache, c)) -> TcRnIf a b c +updNameCache upd_fn = do + HscEnv { hsc_NC = nc_var } <- getTopEnv + atomicUpdMutVar' nc_var upd_fn + +-- | A function that atomically updates the name cache given a modifier +-- function. The second result of the modifier function will be the result +-- of the IO action. +type NameCacheUpdater c = (NameCache -> (NameCache, c)) -> IO c + +-- | Return a function to atomically update the name cache. +mkNameCacheUpdater :: TcRnIf a b (NameCacheUpdater c) +mkNameCacheUpdater = do + nc_var <- hsc_NC `fmap` getTopEnv + let update_nc f = do r <- atomicModifyIORef nc_var f + _ <- evaluate =<< readIORef nc_var + return r + return update_nc \end{code} @@ -277,6 +293,11 @@ tcIfaceTyVar occ Nothing -> failIfM (text "Iface type variable out of scope: " <+> ppr occ) } +lookupIfaceTyVar :: FastString -> IfL (Maybe TyVar) +lookupIfaceTyVar occ + = do { lcl <- getLclEnv + ; return (lookupUFM (if_tv_env lcl) occ) } + extendIfaceTyVarEnv :: [TyVar] -> IfL a -> IfL a extendIfaceTyVarEnv tyvars thing_inside = do { env <- getLclEnv