%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1998
%
\section[Literal]{@Literal@: Machine literals (unboxed, of course)}
\begin{code}
+module Literal
+ ( Literal(..) -- Exported to ParseIface
+ , mkMachInt, mkMachWord
+ , mkMachInt64, mkMachWord64, mkStringLit
+ , litSize
+ , litIsDupable, litIsTrivial
+ , literalType
+ , hashLiteral
+
+ , inIntRange, inWordRange, tARGET_MAX_INT, inCharRange
+ , isZeroLit
+
+ , word2IntLit, int2WordLit
+ , narrow8IntLit, narrow16IntLit, narrow32IntLit
+ , narrow8WordLit, narrow16WordLit, narrow32WordLit
+ , char2IntLit, int2CharLit
+ , float2IntLit, int2FloatLit, double2IntLit, int2DoubleLit
+ , nullAddrLit, float2DoubleLit, double2FloatLit
+ ) where
+
#include "HsVersions.h"
-module Literal (
- Literal(..),
-
- mkMachInt, mkMachWord,
- literalType, literalPrimRep,
- showLiteral,
- isNoRepLit, isLitLitLit
- ) where
-
-IMP_Ubiq(){-uitous-}
-IMPORT_1_3(Ratio)
-
--- friends:
-import PrimRep ( PrimRep(..), ppPrimRep ) -- non-abstract
-import TysPrim ( getPrimRepInfo,
- addrPrimTy, intPrimTy, floatPrimTy,
- doublePrimTy, charPrimTy, wordPrimTy )
-
--- others:
-import CStrings ( stringToC, charToC, charToEasyHaskell )
-import TysWiredIn ( stringTy )
-import Pretty -- pretty-printing stuff
-import PprStyle ( PprStyle(..), codeStyle, ifaceStyle )
-import Util ( thenCmp, panic, pprPanic )
+import TysPrim ( charPrimTy, addrPrimTy, floatPrimTy, doublePrimTy,
+ intPrimTy, wordPrimTy, int64PrimTy, word64PrimTy
+ )
+import Type ( Type )
+import Outputable
+import FastTypes
+import FastString
+import Binary
+
+import Ratio ( numerator )
+import FastString ( uniqueOfFS, lengthFS )
+import DATA_INT ( Int8, Int16, Int32 )
+import DATA_WORD ( Word8, Word16, Word32 )
+import Char ( ord, chr )
+\end{code}
+
+
+
+%************************************************************************
+%* *
+\subsection{Sizes}
+%* *
+%************************************************************************
+
+If we're compiling with GHC (and we're not cross-compiling), then we
+know that minBound and maxBound :: Int are the right values for the
+target architecture. Otherwise, we assume -2^31 and 2^31-1
+respectively (which will be wrong on a 64-bit machine).
+
+\begin{code}
+tARGET_MIN_INT, tARGET_MAX_INT, tARGET_MAX_WORD :: Integer
+#if __GLASGOW_HASKELL__
+tARGET_MIN_INT = toInteger (minBound :: Int)
+tARGET_MAX_INT = toInteger (maxBound :: Int)
+#else
+tARGET_MIN_INT = -2147483648
+tARGET_MAX_INT = 2147483647
+#endif
+tARGET_MAX_WORD = (tARGET_MAX_INT * 2) + 1
+
+tARGET_MAX_CHAR :: Int
+tARGET_MAX_CHAR = 0x10ffff
\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Literals}
+%* *
+%************************************************************************
So-called @Literals@ are {\em either}:
\begin{itemize}
\begin{code}
data Literal
- = MachChar Char
- | MachStr FAST_STRING
+ = ------------------
+ -- First the primitive guys
+ MachChar Char -- Char# At least 31 bits
+
+ | MachStr FastString -- A string-literal: stored and emitted
+ -- UTF-8 encoded, we'll arrange to decode it
+ -- at runtime. Also emitted with a '\0'
+ -- terminator.
- | MachAddr Integer -- whatever this machine thinks is a "pointer"
+ | MachNullAddr -- the NULL pointer, the only pointer value
+ -- that can be represented as a Literal.
- | MachInt Integer -- for the numeric types, these are
- Bool -- True <=> signed (Int#); False <=> unsigned (Word#)
+ | MachInt Integer -- Int# At least WORD_SIZE_IN_BITS bits
+ | MachInt64 Integer -- Int64# At least 64 bits
+ | MachWord Integer -- Word# At least WORD_SIZE_IN_BITS bits
+ | MachWord64 Integer -- Word64# At least 64 bits
| MachFloat Rational
| MachDouble Rational
- | MachLitLit FAST_STRING
- PrimRep
-
- | NoRepStr FAST_STRING
- | NoRepInteger Integer Type -- This Type is always Integer
- | NoRepRational Rational Type -- This Type is always Rational
- -- We keep these Types in the literal because Rational isn't
- -- (currently) wired in, so we can't conjure up its type out of
- -- thin air. Integer is, so the type here is really redundant.
-
- -- deriving (Eq, Ord): no, don't want to compare Types
- -- The Ord is needed for the FiniteMap used in the lookForConstructor
- -- in SimplEnv. If you declared that lookForConstructor *ignores*
- -- constructor-applications with LitArg args, then you could get
- -- rid of this Ord.
-
-mkMachInt, mkMachWord :: Integer -> Literal
-
-mkMachInt x = MachInt x True{-signed-}
-mkMachWord x = MachInt x False{-unsigned-}
-
-instance Ord3 Literal where
- cmp (MachChar a) (MachChar b) = a `tcmp` b
- cmp (MachStr a) (MachStr b) = a `tcmp` b
- cmp (MachAddr a) (MachAddr b) = a `tcmp` b
- cmp (MachInt a b) (MachInt c d) = (a `tcmp` c) `thenCmp` (b `tcmp` d)
- cmp (MachFloat a) (MachFloat b) = a `tcmp` b
- cmp (MachDouble a) (MachDouble b) = a `tcmp` b
- cmp (MachLitLit a b) (MachLitLit c d) = (a `tcmp` c) `thenCmp` (b `tcmp` d)
- cmp (NoRepStr a) (NoRepStr b) = a `tcmp` b
- cmp (NoRepInteger a _) (NoRepInteger b _) = a `tcmp` b
- cmp (NoRepRational a _) (NoRepRational b _) = a `tcmp` b
-
- -- now we *know* the tags are different, so...
- cmp other_1 other_2
- | tag1 _LT_ tag2 = LT_
- | otherwise = GT_
- where
- tag1 = tagof other_1
- tag2 = tagof other_2
-
- tagof (MachChar _) = ILIT(1)
- tagof (MachStr _) = ILIT(2)
- tagof (MachAddr _) = ILIT(3)
- tagof (MachInt _ _) = ILIT(4)
- tagof (MachFloat _) = ILIT(5)
- tagof (MachDouble _) = ILIT(6)
- tagof (MachLitLit _ _) = ILIT(7)
- tagof (NoRepStr _) = ILIT(8)
- tagof (NoRepInteger _ _) = ILIT(9)
- tagof (NoRepRational _ _) = ILIT(10)
-
-tcmp x y = case _tagCmp x y of { _LT -> LT_; _EQ -> EQ_; GT__ -> GT_ }
+ -- MachLabel is used (only) for the literal derived from a
+ -- "foreign label" declaration.
+ -- string argument is the name of a symbol. This literal
+ -- refers to the *address* of the label.
+ | MachLabel FastString -- always an Addr#
+ (Maybe Int) -- the size (in bytes) of the arguments
+ -- the label expects. Only applicable with
+ -- 'stdcall' labels.
+ -- Just x => "@<x>" will be appended to label
+ -- name when emitting asm.
+\end{code}
+
+Binary instance
+
+\begin{code}
+instance Binary Literal where
+ put_ bh (MachChar aa) = do putByte bh 0; put_ bh aa
+ put_ bh (MachStr ab) = do putByte bh 1; put_ bh ab
+ put_ bh (MachNullAddr) = do putByte bh 2
+ put_ bh (MachInt ad) = do putByte bh 3; put_ bh ad
+ put_ bh (MachInt64 ae) = do putByte bh 4; put_ bh ae
+ put_ bh (MachWord af) = do putByte bh 5; put_ bh af
+ put_ bh (MachWord64 ag) = do putByte bh 6; put_ bh ag
+ put_ bh (MachFloat ah) = do putByte bh 7; put_ bh ah
+ put_ bh (MachDouble ai) = do putByte bh 8; put_ bh ai
+ put_ bh (MachLabel aj mb) = do putByte bh 9; put_ bh aj ; put_ bh mb
+ get bh = do
+ h <- getByte bh
+ case h of
+ 0 -> do
+ aa <- get bh
+ return (MachChar aa)
+ 1 -> do
+ ab <- get bh
+ return (MachStr ab)
+ 2 -> do
+ return (MachNullAddr)
+ 3 -> do
+ ad <- get bh
+ return (MachInt ad)
+ 4 -> do
+ ae <- get bh
+ return (MachInt64 ae)
+ 5 -> do
+ af <- get bh
+ return (MachWord af)
+ 6 -> do
+ ag <- get bh
+ return (MachWord64 ag)
+ 7 -> do
+ ah <- get bh
+ return (MachFloat ah)
+ 8 -> do
+ ai <- get bh
+ return (MachDouble ai)
+ 9 -> do
+ aj <- get bh
+ mb <- get bh
+ return (MachLabel aj mb)
+\end{code}
+
+\begin{code}
+instance Outputable Literal where
+ ppr lit = pprLit lit
+
+instance Show Literal where
+ showsPrec p lit = showsPrecSDoc p (ppr lit)
instance Eq Literal where
- a == b = case (a `cmp` b) of { EQ_ -> True; _ -> False }
- a /= b = case (a `cmp` b) of { EQ_ -> False; _ -> True }
+ a == b = case (a `compare` b) of { EQ -> True; _ -> False }
+ a /= b = case (a `compare` b) of { EQ -> False; _ -> True }
instance Ord Literal where
- a <= b = case (a `cmp` b) of { LT_ -> True; EQ_ -> True; GT__ -> False }
- a < b = case (a `cmp` b) of { LT_ -> True; EQ_ -> False; GT__ -> False }
- a >= b = case (a `cmp` b) of { LT_ -> False; EQ_ -> True; GT__ -> True }
- a > b = case (a `cmp` b) of { LT_ -> False; EQ_ -> False; GT__ -> True }
- _tagCmp a b = case (a `cmp` b) of { LT_ -> _LT; EQ_ -> _EQ; GT__ -> _GT }
+ a <= b = case (a `compare` b) of { LT -> True; EQ -> True; GT -> False }
+ a < b = case (a `compare` b) of { LT -> True; EQ -> False; GT -> False }
+ a >= b = case (a `compare` b) of { LT -> False; EQ -> True; GT -> True }
+ a > b = case (a `compare` b) of { LT -> False; EQ -> False; GT -> True }
+ compare a b = cmpLit a b
\end{code}
-\begin{code}
-isNoRepLit (NoRepStr _) = True -- these are not primitive typed!
-isNoRepLit (NoRepInteger _ _) = True
-isNoRepLit (NoRepRational _ _) = True
-isNoRepLit _ = False
-isLitLitLit (MachLitLit _ _) = True
-isLitLitLit _ = False
+ Construction
+ ~~~~~~~~~~~~
+\begin{code}
+mkMachInt, mkMachWord, mkMachInt64, mkMachWord64 :: Integer -> Literal
+
+mkMachInt x = -- ASSERT2( inIntRange x, integer x )
+ -- Not true: you can write out of range Int# literals
+ -- For example, one can write (intToWord# 0xffff0000) to
+ -- get a particular Word bit-pattern, and there's no other
+ -- convenient way to write such literals, which is why we allow it.
+ MachInt x
+mkMachWord x = -- ASSERT2( inWordRange x, integer x )
+ MachWord x
+mkMachInt64 x = MachInt64 x
+mkMachWord64 x = MachWord64 x
+
+mkStringLit :: String -> Literal
+mkStringLit s = MachStr (mkFastString s) -- stored UTF-8 encoded
+
+inIntRange, inWordRange :: Integer -> Bool
+inIntRange x = x >= tARGET_MIN_INT && x <= tARGET_MAX_INT
+inWordRange x = x >= 0 && x <= tARGET_MAX_WORD
+
+inCharRange :: Char -> Bool
+inCharRange c = c >= '\0' && c <= chr tARGET_MAX_CHAR
+
+isZeroLit :: Literal -> Bool
+isZeroLit (MachInt 0) = True
+isZeroLit (MachInt64 0) = True
+isZeroLit (MachWord 0) = True
+isZeroLit (MachWord64 0) = True
+isZeroLit (MachFloat 0) = True
+isZeroLit (MachDouble 0) = True
+isZeroLit other = False
\end{code}
+ Coercions
+ ~~~~~~~~~
\begin{code}
-literalType :: Literal -> Type
+word2IntLit, int2WordLit,
+ narrow8IntLit, narrow16IntLit, narrow32IntLit,
+ narrow8WordLit, narrow16WordLit, narrow32WordLit,
+ char2IntLit, int2CharLit,
+ float2IntLit, int2FloatLit, double2IntLit, int2DoubleLit,
+ float2DoubleLit, double2FloatLit
+ :: Literal -> Literal
+
+word2IntLit (MachWord w)
+ | w > tARGET_MAX_INT = MachInt (w - tARGET_MAX_WORD - 1)
+ | otherwise = MachInt w
+
+int2WordLit (MachInt i)
+ | i < 0 = MachWord (1 + tARGET_MAX_WORD + i) -- (-1) ---> tARGET_MAX_WORD
+ | otherwise = MachWord i
+
+narrow8IntLit (MachInt i) = MachInt (toInteger (fromInteger i :: Int8))
+narrow16IntLit (MachInt i) = MachInt (toInteger (fromInteger i :: Int16))
+narrow32IntLit (MachInt i) = MachInt (toInteger (fromInteger i :: Int32))
+narrow8WordLit (MachWord w) = MachWord (toInteger (fromInteger w :: Word8))
+narrow16WordLit (MachWord w) = MachWord (toInteger (fromInteger w :: Word16))
+narrow32WordLit (MachWord w) = MachWord (toInteger (fromInteger w :: Word32))
+
+char2IntLit (MachChar c) = MachInt (toInteger (ord c))
+int2CharLit (MachInt i) = MachChar (chr (fromInteger i))
+
+float2IntLit (MachFloat f) = MachInt (truncate f)
+int2FloatLit (MachInt i) = MachFloat (fromInteger i)
+
+double2IntLit (MachDouble f) = MachInt (truncate f)
+int2DoubleLit (MachInt i) = MachDouble (fromInteger i)
+
+float2DoubleLit (MachFloat f) = MachDouble f
+double2FloatLit (MachDouble d) = MachFloat d
+
+nullAddrLit :: Literal
+nullAddrLit = MachNullAddr
+\end{code}
-literalType (MachChar _) = charPrimTy
-literalType (MachStr _) = addrPrimTy
-literalType (MachAddr _) = addrPrimTy
-literalType (MachInt _ signed) = if signed then intPrimTy else wordPrimTy
-literalType (MachFloat _) = floatPrimTy
-literalType (MachDouble _) = doublePrimTy
-literalType (MachLitLit _ k) = case (getPrimRepInfo k) of { (_,t,_) -> t }
-literalType (NoRepInteger _ t) = t
-literalType (NoRepRational _ t) = t
-literalType (NoRepStr _) = stringTy
+ Predicates
+ ~~~~~~~~~~
+\begin{code}
+litIsTrivial :: Literal -> Bool
+-- True if there is absolutely no penalty to duplicating the literal
+-- c.f. CoreUtils.exprIsTrivial
+-- False principally of strings
+litIsTrivial (MachStr _) = False
+litIsTrivial other = True
+
+litIsDupable :: Literal -> Bool
+-- True if code space does not go bad if we duplicate this literal
+-- c.f. CoreUtils.exprIsDupable
+-- Currently we treat it just like litIsTrivial
+litIsDupable (MachStr _) = False
+litIsDupable other = True
+
+litSize :: Literal -> Int
+-- Used by CoreUnfold.sizeExpr
+litSize (MachStr str) = 1 + ((lengthFS str + 3) `div` 4)
+ -- Every literal has size at least 1, otherwise
+ -- f "x"
+ -- might be too small
+ -- [Sept03: make literal strings a bit bigger to avoid fruitless
+ -- duplication of little strings]
+litSize _other = 1
\end{code}
+ Types
+ ~~~~~
\begin{code}
-literalPrimRep :: Literal -> PrimRep
-
-literalPrimRep (MachChar _) = CharRep
-literalPrimRep (MachStr _) = AddrRep -- specifically: "char *"
-literalPrimRep (MachAddr _) = AddrRep
-literalPrimRep (MachInt _ signed) = if signed then IntRep else WordRep
-literalPrimRep (MachFloat _) = FloatRep
-literalPrimRep (MachDouble _) = DoubleRep
-literalPrimRep (MachLitLit _ k) = k
-#ifdef DEBUG
-literalPrimRep (NoRepInteger _ _) = panic "literalPrimRep:NoRepInteger"
-literalPrimRep (NoRepRational _ _) = panic "literalPrimRep:NoRepRational"
-literalPrimRep (NoRepStr _) = panic "literalPrimRep:NoRepString"
-#endif
+literalType :: Literal -> Type
+literalType MachNullAddr = addrPrimTy
+literalType (MachChar _) = charPrimTy
+literalType (MachStr _) = addrPrimTy
+literalType (MachInt _) = intPrimTy
+literalType (MachWord _) = wordPrimTy
+literalType (MachInt64 _) = int64PrimTy
+literalType (MachWord64 _) = word64PrimTy
+literalType (MachFloat _) = floatPrimTy
+literalType (MachDouble _) = doublePrimTy
+literalType (MachLabel _ _) = addrPrimTy
\end{code}
-The boring old output stuff:
+
+ Comparison
+ ~~~~~~~~~~
\begin{code}
-ppCast :: PprStyle -> FAST_STRING -> Pretty
-ppCast PprForC cast = ppPStr cast
-ppCast _ _ = ppNil
+cmpLit (MachChar a) (MachChar b) = a `compare` b
+cmpLit (MachStr a) (MachStr b) = a `compare` b
+cmpLit (MachNullAddr) (MachNullAddr) = EQ
+cmpLit (MachInt a) (MachInt b) = a `compare` b
+cmpLit (MachWord a) (MachWord b) = a `compare` b
+cmpLit (MachInt64 a) (MachInt64 b) = a `compare` b
+cmpLit (MachWord64 a) (MachWord64 b) = a `compare` b
+cmpLit (MachFloat a) (MachFloat b) = a `compare` b
+cmpLit (MachDouble a) (MachDouble b) = a `compare` b
+cmpLit (MachLabel a _) (MachLabel b _) = a `compare` b
+cmpLit lit1 lit2 | litTag lit1 <# litTag lit2 = LT
+ | otherwise = GT
+
+litTag (MachChar _) = _ILIT(1)
+litTag (MachStr _) = _ILIT(2)
+litTag (MachNullAddr) = _ILIT(3)
+litTag (MachInt _) = _ILIT(4)
+litTag (MachWord _) = _ILIT(5)
+litTag (MachInt64 _) = _ILIT(6)
+litTag (MachWord64 _) = _ILIT(7)
+litTag (MachFloat _) = _ILIT(8)
+litTag (MachDouble _) = _ILIT(9)
+litTag (MachLabel _ _) = _ILIT(10)
+\end{code}
--- MachX (i.e. unboxed) things are printed unadornded (e.g. 3, 'a', "foo")
--- exceptions: MachFloat and MachAddr get an initial keyword prefix
---
--- NoRep things get an initial keyword prefix (e.g. _integer_ 3)
+ Printing
+ ~~~~~~~~
+* MachX (i.e. unboxed) things are printed unadornded (e.g. 3, 'a', "foo")
+ exceptions: MachFloat gets an initial keyword prefix.
-instance Outputable Literal where
- ppr sty (MachChar ch)
- = let
- char_encoding
- = case sty of
- PprForC -> charToC ch
- PprForAsm _ _ -> charToC ch
- PprInterface -> charToEasyHaskell ch
- _ -> [ch]
- in
- ppBesides [ppCast sty SLIT("(C_)"), ppChar '\'', ppStr char_encoding, ppChar '\'']
-
- ppr sty (MachStr s)
- | codeStyle sty = ppBesides [ppChar '"', ppStr (stringToC (_UNPK_ s)), ppChar '"']
- | otherwise = ppBesides [ppChar '"', ppPStr s, ppChar '"']
-
- ppr sty lit@(NoRepStr s)
- | codeStyle sty = pprPanic "NoRep in code style" (ppr PprDebug lit)
- | otherwise = ppBesides [ppPStr SLIT("_string_"), ppChar '"', ppPStr s,ppChar '"']
-
- ppr sty (MachInt i signed)
- | codeStyle sty && out_of_range
- = panic ("ERROR: Int " ++ show i ++ " out of range [" ++
- show range_min ++ " .. " ++ show range_max ++ "]\n")
-
- | otherwise = ppInteger i
-
- where
- range_min = if signed then minInt else 0
- range_max = maxInt
- out_of_range = not (i >= toInteger range_min && i <= toInteger range_max)
-
- ppr sty (MachFloat f)
- | codeStyle sty = ppBesides [ppCast sty SLIT("(StgFloat)"), ppRational f]
- | otherwise = ppBesides [ppPStr SLIT("_float_"), ppRational f]
-
- ppr sty (MachDouble d) = ppRational d
-
- ppr sty (MachAddr p)
- | codeStyle sty = ppBesides [ppCast sty SLIT("(void*)"), ppInteger p]
- | otherwise = ppBesides [ppPStr SLIT("_addr_"), ppInteger p]
-
- ppr sty lit@(NoRepInteger i _)
- | codeStyle sty = pprPanic "NoRep in code style" (ppr PprDebug lit)
- | otherwise = ppCat [ppPStr SLIT("_integer_"), ppInteger i]
-
- ppr sty lit@(NoRepRational r _)
- | codeStyle sty = pprPanic "NoRep in code style" (ppr PprDebug lit)
- | otherwise = ppCat [ppPStr SLIT("_rational_"), ppInteger (numerator r), ppInteger (denominator r)]
-
- ppr sty (MachLitLit s k)
- | codeStyle sty = ppPStr s
- | otherwise = ppBesides [ppPStr SLIT("_litlit_ "), ppPrimRep k, ppStr " \"", ppPStr s, ppChar '"']
-
-showLiteral :: PprStyle -> Literal -> String
-showLiteral sty lit = ppShow 80 (ppr sty lit)
+\begin{code}
+pprLit (MachChar ch) = pprHsChar ch
+pprLit (MachStr s) = pprHsString s
+pprLit (MachInt i) = pprIntVal i
+pprLit (MachInt64 i) = ptext SLIT("__int64") <+> integer i
+pprLit (MachWord w) = ptext SLIT("__word") <+> integer w
+pprLit (MachWord64 w) = ptext SLIT("__word64") <+> integer w
+pprLit (MachFloat f) = ptext SLIT("__float") <+> rational f
+pprLit (MachDouble d) = rational d
+pprLit (MachNullAddr) = ptext SLIT("__NULL")
+pprLit (MachLabel l mb) = ptext SLIT("__label") <+>
+ case mb of
+ Nothing -> pprHsString l
+ Just x -> doubleQuotes (text (unpackFS l ++ '@':show x))
+
+pprIntVal :: Integer -> SDoc
+-- Print negative integers with parens to be sure it's unambiguous
+pprIntVal i | i < 0 = parens (integer i)
+ | otherwise = integer i
\end{code}
+
+%************************************************************************
+%* *
+\subsection{Hashing}
+%* *
+%************************************************************************
+
+Hash values should be zero or a positive integer. No negatives please.
+(They mess up the UniqFM for some reason.)
+
+\begin{code}
+hashLiteral :: Literal -> Int
+hashLiteral (MachChar c) = ord c + 1000 -- Keep it out of range of common ints
+hashLiteral (MachStr s) = hashFS s
+hashLiteral (MachNullAddr) = 0
+hashLiteral (MachInt i) = hashInteger i
+hashLiteral (MachInt64 i) = hashInteger i
+hashLiteral (MachWord i) = hashInteger i
+hashLiteral (MachWord64 i) = hashInteger i
+hashLiteral (MachFloat r) = hashRational r
+hashLiteral (MachDouble r) = hashRational r
+hashLiteral (MachLabel s _) = hashFS s
+
+hashRational :: Rational -> Int
+hashRational r = hashInteger (numerator r)
+
+hashInteger :: Integer -> Int
+hashInteger i = 1 + abs (fromInteger (i `rem` 10000))
+ -- The 1+ is to avoid zero, which is a Bad Number
+ -- since we use * to combine hash values
+
+hashFS :: FastString -> Int
+hashFS s = iBox (uniqueOfFS s)
+\end{code}
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