%
+% (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 (
#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 Maybes
+import Util
+
+import GHC.Exts -- For `xori`
\end{code}
exprOkForSpeculation :: CoreExpr -> Bool
exprOkForSpeculation (Lit _) = True
exprOkForSpeculation (Type _) = True
+ -- Tick boxes are *not* suitable for speculation
exprOkForSpeculation (Var v) = isUnLiftedType (idType v)
+ && not (isTickBoxOp v)
exprOkForSpeculation (Note _ e) = exprOkForSpeculation e
exprOkForSpeculation (Cast e co) = exprOkForSpeculation e
exprOkForSpeculation other_expr
-- 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
-- The left-hand one must be a T, because exprIsConApp returned True
-- but the right-hand one might not be. (Though it usually will.)
- let (from_ty, to_ty) = coercionKind co
- (from_tc, _from_tc_arg_tys) = splitTyConApp from_ty
+ let (from_ty, to_ty) = coercionKind co
+ (from_tc, from_tc_arg_tys) = splitTyConApp from_ty
-- The inner one must be a TyConApp
in
- ASSERT( from_tc == dataConTyCon dc )
-
case splitTyConApp_maybe to_ty of {
Nothing -> Nothing ;
- Just (to_tc, _to_tc_arg_tys) | from_tc /= to_tc -> Nothing
- | otherwise ->
+ Just (to_tc, to_tc_arg_tys)
+ | from_tc /= to_tc -> Nothing
+ -- These two Nothing cases are possible; we might see
+ -- (C x y) `cast` (g :: T a ~ S [a]),
+ -- where S is a type function. In fact, exprIsConApp
+ -- will probably not be called in such circumstances,
+ -- but there't nothing wrong with it
+
+ | otherwise ->
let
tc_arity = tyConArity from_tc
in
ASSERT( length univ_args == tc_arity )
+ ASSERT( from_tc == dataConTyCon dc )
+ ASSERT( and (zipWith coreEqType [t | Type t <- univ_args] from_tc_arg_tys) )
ASSERT( all isTypeArg (univ_args ++ ex_args) )
ASSERT2( equalLength val_args arg_tys, ppr dc $$ ppr dc_tyvars $$ ppr dc_ex_tyvars $$ ppr arg_tys $$ ppr dc_args $$ ppr univ_args $$ ppr ex_args $$ ppr val_args $$ ppr arg_tys )
- Just (dc, univ_args ++ ex_args ++ new_co_args ++ new_val_args)
+ Just (dc, map Type to_tc_arg_tys ++ ex_args ++ new_co_args ++ new_val_args)
}}
+{-
+-- We do not want to tell the world that we have a
+-- Cons, to *stop* Case of Known Cons, which removes
+-- the TickBox.
+exprIsConApp_maybe (Note (TickBox {}) expr)
+ = Nothing
+exprIsConApp_maybe (Note (BinaryTickBox {}) expr)
+ = Nothing
+-}
+
exprIsConApp_maybe (Note _ expr)
= exprIsConApp_maybe expr
-- We ignore InlineMe notes in case we have
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 ->
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}
noteSize (SCC cc) = cc `seq` 1
noteSize InlineMe = 1
noteSize (CoreNote s) = s `seq` 1 -- hdaume: core annotations
-
+
varSize :: Var -> Int
varSize b | isTyVar b = 1
| otherwise = seqType (idType b) `seq`
-- expressions may hash to the different Ints
--
-- The emphasis is on a crude, fast hash, rather than on high precision
+--
+-- We must be careful that \x.x and \y.y map to the same hash code,
+-- (at least if we want the above invariant to be true)
hashExpr e | hash < 0 = 77 -- Just in case we hit -maxInt
| otherwise = hash
where
- hash = abs (hash_expr e) -- Negative numbers kill UniqFM
-
-hash_expr (Note _ e) = hash_expr e
-hash_expr (Cast e co) = hash_expr e
-hash_expr (Let (NonRec b r) e) = hashId b
-hash_expr (Let (Rec ((b,r):_)) e) = hashId b
-hash_expr (Case _ b _ _) = hashId b
-hash_expr (App f e) = hash_expr f * fast_hash_expr e
-hash_expr (Var v) = hashId v
-hash_expr (Lit lit) = hashLiteral lit
-hash_expr (Lam b _) = hashId b
-hash_expr (Type t) = trace "hash_expr: type" 1 -- Shouldn't happen
-
-fast_hash_expr (Var v) = hashId v
-fast_hash_expr (Lit lit) = hashLiteral lit
-fast_hash_expr (App f (Type _)) = fast_hash_expr f
-fast_hash_expr (App f a) = fast_hash_expr a
-fast_hash_expr (Lam b _) = hashId b
-fast_hash_expr other = 1
-
-hashId :: Id -> Int
-hashId id = hashName (idName id)
+ hash = abs (hash_expr (1,emptyVarEnv) e) -- Negative numbers kill UniqFM
+
+type HashEnv = (Int, VarEnv Int) -- Hash code for bound variables
+
+hash_expr :: HashEnv -> CoreExpr -> Int
+hash_expr env (Note _ e) = hash_expr env e
+hash_expr env (Cast e co) = hash_expr env e
+hash_expr env (Var v) = hashVar env v
+hash_expr env (Lit lit) = hashLiteral lit
+hash_expr env (App f e) = hash_expr env f * fast_hash_expr env e
+hash_expr env (Let (NonRec b r) e) = hash_expr (extend_env env b) e * fast_hash_expr env r
+hash_expr env (Let (Rec ((b,r):_)) e) = hash_expr (extend_env env b) e
+hash_expr env (Case e _ _ _) = hash_expr env e
+hash_expr env (Lam b e) = hash_expr (extend_env env b) e
+hash_expr env (Type t) = fast_hash_type env t
+
+fast_hash_expr env (Var v) = hashVar env v
+fast_hash_expr env (Type t) = fast_hash_type env t
+fast_hash_expr env (Lit lit) = hashLiteral lit
+fast_hash_expr env (Cast e co) = fast_hash_expr env e
+fast_hash_expr env (Note n e) = fast_hash_expr env e
+fast_hash_expr env (App f a) = fast_hash_expr env a -- A bit idiosyncratic ('a' not 'f')!
+fast_hash_expr env other = 1
+
+fast_hash_type :: HashEnv -> Type -> Int
+fast_hash_type env ty
+ | Just tv <- getTyVar_maybe ty = hashVar env tv
+ | Just (tc,_) <- splitTyConApp_maybe ty = hashName (tyConName tc)
+ | otherwise = 1
+
+extend_env :: HashEnv -> Var -> (Int, VarEnv Int)
+extend_env (n,env) b = (n+1, extendVarEnv env b n)
+
+hashVar :: HashEnv -> Var -> Int
+hashVar (_,env) v = lookupVarEnv env v `orElse` hashName (idName v)
\end{code}
%************************************************************************
projects / ghc-hetmet.git / blobdiff