( Literal(..) -- Exported to ParseIface
, mkMachInt, mkMachWord
, mkMachInt64, mkMachWord64
- , isLitLitLit, maybeLitLit, litSize
+ , litSize
, litIsDupable, litIsTrivial
, literalType, literalPrimRep
, hashLiteral
intPrimTy, wordPrimTy, int64PrimTy, word64PrimTy
)
import PrimRep ( PrimRep(..) )
-import TcType ( Type, tcCmpType )
-import Type ( typePrimRep )
-import PprType ( pprParendType )
+import Type ( Type )
import CStrings ( pprFSInCStyle )
import Outputable
import FastTypes
import FastString
import Binary
-import Util ( thenCmp )
import Ratio ( numerator )
import FastString ( uniqueOfFS, lengthFS )
MachChar Int -- Char# At least 31 bits
| MachStr FastString
- | 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 -- Int# At least WORD_SIZE_IN_BITS bits
| MachInt64 Integer -- Int64# At least 64 bits
-- 'stdcall' labels.
-- Just x => "@<x>" will be appended to label
-- name when emitting asm.
-
- -- lit-lits only work for via-C compilation, hence they
- -- are deprecated. The string is emitted verbatim into
- -- the C file, and can therefore be any C expression,
- -- macro call, #defined constant etc.
- | MachLitLit FastString Type -- Type might be Addr# or Int# etc
\end{code}
-Binary instance: must do this manually, because we don't want the type
-arg of MachLitLit involved.
+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 (MachAddr ac) = do putByte bh 2; put_ bh ac
+ 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 (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
- put_ bh (MachLitLit ak _) = do putByte bh 10; put_ bh ak
get bh = do
h <- getByte bh
case h of
ab <- get bh
return (MachStr ab)
2 -> do
- ac <- get bh
- return (MachAddr ac)
+ return (MachNullAddr)
3 -> do
ad <- get bh
return (MachInt ad)
aj <- get bh
mb <- get bh
return (MachLabel aj mb)
- 10 -> do
- ak <- get bh
- return (MachLitLit ak (error "MachLitLit: no type"))
\end{code}
\begin{code}
double2FloatLit (MachDouble d) = MachFloat d
nullAddrLit :: Literal
-nullAddrLit = MachAddr 0
+nullAddrLit = MachNullAddr
\end{code}
Predicates
~~~~~~~~~~
\begin{code}
-isLitLitLit (MachLitLit _ _) = True
-isLitLitLit _ = False
-
-maybeLitLit (MachLitLit s t) = Just (s,t)
-maybeLitLit _ = Nothing
-
litIsTrivial :: Literal -> Bool
-- True if there is absolutely no penalty to duplicating the literal
-- c.f. CoreUtils.exprIsTrivial
litSize :: Literal -> Int
-- Used by CoreUnfold.sizeExpr
-litSize (MachStr str) = 1 + (lengthFS str `div` 4)
+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}
literalType :: Literal -> Type
literalType (MachChar _) = charPrimTy
literalType (MachStr _) = addrPrimTy
-literalType (MachAddr _) = addrPrimTy
+literalType (MachNullAddr) = addrPrimTy
literalType (MachInt _) = intPrimTy
literalType (MachWord _) = wordPrimTy
literalType (MachInt64 _) = int64PrimTy
literalType (MachFloat _) = floatPrimTy
literalType (MachDouble _) = doublePrimTy
literalType (MachLabel _ _) = addrPrimTy
-literalType (MachLitLit _ ty) = ty
\end{code}
\begin{code}
literalPrimRep (MachChar _) = CharRep
literalPrimRep (MachStr _) = AddrRep -- specifically: "char *"
-literalPrimRep (MachAddr _) = AddrRep
+literalPrimRep (MachNullAddr) = AddrRep
literalPrimRep (MachInt _) = IntRep
literalPrimRep (MachWord _) = WordRep
literalPrimRep (MachInt64 _) = Int64Rep
literalPrimRep (MachFloat _) = FloatRep
literalPrimRep (MachDouble _) = DoubleRep
literalPrimRep (MachLabel _ _) = AddrRep
-literalPrimRep (MachLitLit _ ty) = typePrimRep ty
\end{code}
\begin{code}
cmpLit (MachChar a) (MachChar b) = a `compare` b
cmpLit (MachStr a) (MachStr b) = a `compare` b
-cmpLit (MachAddr a) (MachAddr 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 (MachFloat a) (MachFloat b) = a `compare` b
cmpLit (MachDouble a) (MachDouble b) = a `compare` b
cmpLit (MachLabel a _) (MachLabel b _) = a `compare` b
-cmpLit (MachLitLit a b) (MachLitLit c d) = (a `compare` c) `thenCmp` (b `tcCmpType` d)
cmpLit lit1 lit2 | litTag lit1 <# litTag lit2 = LT
- | otherwise = GT
+ | otherwise = GT
litTag (MachChar _) = _ILIT(1)
litTag (MachStr _) = _ILIT(2)
-litTag (MachAddr _) = _ILIT(3)
+litTag (MachNullAddr) = _ILIT(3)
litTag (MachInt _) = _ILIT(4)
litTag (MachWord _) = _ILIT(5)
litTag (MachInt64 _) = _ILIT(6)
litTag (MachFloat _) = _ILIT(8)
litTag (MachDouble _) = _ILIT(9)
litTag (MachLabel _ _) = _ILIT(10)
-litTag (MachLitLit _ _) = _ILIT(11)
\end{code}
Printing
~~~~~~~~
* MachX (i.e. unboxed) things are printed unadornded (e.g. 3, 'a', "foo")
- exceptions: MachFloat and MachAddr get an initial keyword prefix
+ exceptions: MachFloat gets an initial keyword prefix.
\begin{code}
pprLit lit
MachDouble d | code_style -> code_rational d
| otherwise -> rational d
- MachAddr p | code_style -> ptext SLIT("(void*)") <> integer p
- | otherwise -> ptext SLIT("__addr") <+> integer p
+ MachNullAddr | code_style -> ptext SLIT("(void*)0")
+ | otherwise -> ptext SLIT("__NULL")
MachLabel l mb
| code_style -> ptext SLIT("(&") <> ftext l <> char ')'
Nothing -> pprHsString l
Just x -> doubleQuotes (text (unpackFS l ++ '@':show x))
- MachLitLit s ty | code_style -> ftext s
- | otherwise -> parens (hsep [ptext SLIT("__litlit"),
- pprHsString s,
- pprParendType ty])
-
-- negative floating literals in code style need parentheses to avoid
-- interacting with surrounding syntax.
code_rational d | d < 0 = parens (rational d)
hashLiteral :: Literal -> Int
hashLiteral (MachChar c) = c + 1000 -- Keep it out of range of common ints
hashLiteral (MachStr s) = hashFS s
-hashLiteral (MachAddr i) = hashInteger i
+hashLiteral (MachNullAddr) = 0
hashLiteral (MachInt i) = hashInteger i
hashLiteral (MachInt64 i) = hashInteger i
hashLiteral (MachWord i) = hashInteger i
hashLiteral (MachFloat r) = hashRational r
hashLiteral (MachDouble r) = hashRational r
hashLiteral (MachLabel s _) = hashFS s
-hashLiteral (MachLitLit s _) = hashFS s
hashRational :: Rational -> Int
hashRational r = hashInteger (numerator r)
projects / ghc-hetmet.git / blobdiff