X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2FcoreSyn%2FCoreUtils.lhs;h=ffbdb50422760f73e770f16f7bf1df8ce70dcc58;hb=d5e97410a9d7309b53a8df78d69172d3b1592ba7;hp=637f66a17e0f648f21ffbc84e6102ccc09808e8d;hpb=35d3bb34cef41053d0cb2bd03df927885b1b7d2e;p=ghc-hetmet.git

diff --git a/compiler/coreSyn/CoreUtils.lhs b/compiler/coreSyn/CoreUtils.lhs
index 637f66a..ffbdb50 100644
--- a/compiler/coreSyn/CoreUtils.lhs
+++ b/compiler/coreSyn/CoreUtils.lhs
@@ -1,7 +1,9 @@
 %
+% (c) The University of Glasgow 2006
 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
 %
-\section[CoreUtils]{Utility functions on @Core@ syntax}
+
+Utility functions on @Core@ syntax
 
 \begin{code}
 module CoreUtils (
@@ -38,57 +40,38 @@ module CoreUtils (
 
 #include "HsVersions.h"
 
-
-import GLAEXTS		-- For `xori` 
-
 import CoreSyn
-import CoreFVs		( exprFreeVars )
-import PprCore		( pprCoreExpr )
-import Var		( Var, TyVar, CoVar, tyVarKind, mkCoVar, mkTyVar )
-import OccName          ( mkVarOccFS )
-import SrcLoc		( noSrcLoc )
-import VarSet		( unionVarSet )
+import CoreFVs
+import PprCore
+import Var
+import SrcLoc
+import VarSet
 import VarEnv
-import Name		( hashName, mkSysTvName )
+import Name
 #if mingw32_TARGET_OS
-import Packages		( isDllName )
+import Packages
 #endif
-import Literal		( hashLiteral, literalType, litIsDupable, 
-			  litIsTrivial, isZeroLit, Literal( MachLabel ) )
-import DataCon		( DataCon, dataConRepArity, eqSpecPreds, 
-			  dataConTyCon, dataConRepArgTys,
-                          dataConUnivTyVars, dataConExTyVars, dataConEqSpec,
-                          dataConOrigArgTys, dataConTheta )
-import PrimOp		( PrimOp(..), primOpOkForSpeculation, primOpIsCheap )
-import Id		( Id, idType, globalIdDetails, idNewStrictness, 
-			  mkWildId, idArity, idName, idUnfolding, idInfo,
-			  isOneShotBndr, isStateHackType, 
-			  isDataConWorkId_maybe, mkSysLocal, mkUserLocal,
-			  isDataConWorkId, isBottomingId, isDictId
-			)
-import IdInfo		( GlobalIdDetails(..), megaSeqIdInfo )
-import NewDemand	( appIsBottom )
-import Type		( Type, mkFunTy, mkForAllTy, splitFunTy_maybe,
-			  splitFunTy, tcEqTypeX,
-			  applyTys, isUnLiftedType, seqType, mkTyVarTy,
-			  splitForAllTy_maybe, isForAllTy, 
-			  splitTyConApp_maybe, splitTyConApp, coreEqType, funResultTy, applyTy,
-                          substTyWith, mkPredTy, zipOpenTvSubst, substTy, substTyVar
-			)
-import Coercion         ( Coercion, mkTransCoercion, coercionKind,
-                          splitNewTypeRepCo_maybe, mkSymCoercion,
-                          decomposeCo, coercionKindPredTy )
-import TyCon		( tyConArity )
-import TysWiredIn	( boolTy, trueDataCon, falseDataCon )
-import CostCentre	( CostCentre )
-import BasicTypes	( Arity )
-import PackageConfig	( PackageId )
-import Unique		( Unique )
+import Literal
+import DataCon
+import PrimOp
+import Id
+import IdInfo
+import NewDemand
+import Type
+import Coercion
+import TyCon
+import TysWiredIn
+import CostCentre
+import BasicTypes
+import PackageConfig
+import Unique
 import Outputable
-import DynFlags		( DynFlags, DynFlag(Opt_DictsCheap), dopt )
-import TysPrim		( alphaTy )	-- Debugging only
-import Util             ( equalLength, lengthAtLeast, foldl2 )
-import FastString       ( FastString )
+import DynFlags
+import TysPrim
+import FastString
+import Util
+
+import GHC.Exts		-- For `xori` 
 \end{code}
 
 
@@ -633,15 +616,15 @@ exprIsHNF (Var v) 	-- NB: There are no value args at this point
 	-- A worry: what if an Id's unfolding is just itself: 
 	-- then we could get an infinite loop...
 
-exprIsHNF (Lit l)	     = True
-exprIsHNF (Type ty)	     = True	-- Types are honorary Values; 
-					-- we don't mind copying them
-exprIsHNF (Lam b e)  	     = isRuntimeVar b || exprIsHNF e
-exprIsHNF (Note _ e) 	     = exprIsHNF e
-exprIsHNF (Cast e co)        = exprIsHNF e
+exprIsHNF (Lit l)	   = True
+exprIsHNF (Type ty)	   = True	-- Types are honorary Values; 
+			   		-- we don't mind copying them
+exprIsHNF (Lam b e)  	   = isRuntimeVar b || exprIsHNF e
+exprIsHNF (Note _ e) 	   = exprIsHNF e
+exprIsHNF (Cast e co)      = exprIsHNF e
 exprIsHNF (App e (Type _)) = exprIsHNF e
 exprIsHNF (App e a)        = app_is_value e [a]
-exprIsHNF other	     = False
+exprIsHNF other	           = False
 
 -- There is at least one value argument
 app_is_value (Var fun) args
@@ -1137,7 +1120,8 @@ eta_expand n us expr ty
 
               Lam lam_tv (eta_expand n us2 (App expr (Type (mkTyVarTy lam_tv))) (substTyWith [tv] [mkTyVarTy lam_tv] ty'))
                   where 
-                    lam_tv = mkTyVar (mkSysTvName uniq FSLIT("etaT")) (tyVarKind tv)
+                    lam_tv = setVarName tv (mkSysTvName uniq FSLIT("etaT"))
+			-- Using tv as a base retains its tyvar/covar-ness
                     (uniq:us2) = us 
  	; Nothing ->
   
@@ -1240,6 +1224,7 @@ exprIsBig (Lit _)      = False
 exprIsBig (Var v)      = False
 exprIsBig (Type t)     = False
 exprIsBig (App f a)    = exprIsBig f || exprIsBig a
+exprIsBig (Cast e _)   = exprIsBig e	-- Hopefully coercions are not too big!
 exprIsBig other	       = True
 \end{code}