( Literal(..) -- Exported to ParseIface
, mkMachInt, mkMachWord
, mkMachInt64, mkMachWord64
- , isLitLitLit, maybeLitLit, litSize, litIsDupable,
+ , isLitLitLit, maybeLitLit, litSize
+ , litIsDupable, litIsTrivial
, literalType, literalPrimRep
, hashLiteral
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
-- 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.
-- lit-lits only work for via-C compilation, hence they
-- are deprecated. The string is emitted verbatim into
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 (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) = do putByte bh 9; put_ bh aj
+ 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
ab <- get bh
return (MachStr ab)
2 -> do
- ac <- get bh
- return (MachAddr ac)
+ return (MachNullAddr)
3 -> do
ad <- get bh
return (MachInt ad)
return (MachDouble ai)
9 -> do
aj <- get bh
- return (MachLabel aj)
+ mb <- get bh
+ return (MachLabel aj mb)
10 -> do
ak <- get bh
return (MachLitLit ak (error "MachLitLit: no type"))
double2FloatLit (MachDouble d) = MachFloat d
nullAddrLit :: Literal
-nullAddrLit = MachAddr 0
+nullAddrLit = MachNullAddr
\end{code}
Predicates
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
+-- 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
- -- False principally of strings
+-- 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
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 (MachWord64 _) = word64PrimTy
literalType (MachFloat _) = floatPrimTy
literalType (MachDouble _) = doublePrimTy
-literalType (MachLabel _) = addrPrimTy
+literalType (MachLabel _ _) = addrPrimTy
literalType (MachLitLit _ ty) = ty
\end{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 (MachWord64 _) = Word64Rep
literalPrimRep (MachFloat _) = FloatRep
literalPrimRep (MachDouble _) = DoubleRep
-literalPrimRep (MachLabel _) = AddrRep
+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 (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 (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
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 (MachWord64 _) = _ILIT(7)
litTag (MachFloat _) = _ILIT(8)
litTag (MachDouble _) = _ILIT(9)
-litTag (MachLabel _) = _ILIT(10)
-litTag (MachLitLit _ _) = _ILIT(11)
+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 | code_style -> ptext SLIT("(&") <> ftext l <> char ')'
- | otherwise -> ptext SLIT("__label") <+> pprHsString l
+ MachLabel l mb
+ | code_style -> ptext SLIT("(&") <> ftext l <> char ')'
+ | otherwise -> ptext SLIT("__label") <+>
+ case mb of
+ Nothing -> pprHsString l
+ Just x -> doubleQuotes (text (unpackFS l ++ '@':show x))
MachLitLit s ty | code_style -> ftext s
| otherwise -> parens (hsep [ptext SLIT("__litlit"),
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 (MachWord64 i) = hashInteger i
hashLiteral (MachFloat r) = hashRational r
hashLiteral (MachDouble r) = hashRational r
-hashLiteral (MachLabel s) = hashFS s
+hashLiteral (MachLabel s _) = hashFS s
hashLiteral (MachLitLit s _) = hashFS s
hashRational :: Rational -> Int
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