, hashLiteral
, inIntRange, inWordRange, tARGET_MAX_INT, inCharRange
+ , isZeroLit,
, word2IntLit, int2WordLit
- , intToInt8Lit, intToInt16Lit, intToInt32Lit
- , wordToWord8Lit, wordToWord16Lit, wordToWord32Lit
+ , narrow8IntLit, narrow16IntLit, narrow32IntLit
+ , narrow8WordLit, narrow16WordLit, narrow32WordLit
, char2IntLit, int2CharLit
, float2IntLit, int2FloatLit, double2IntLit, int2DoubleLit
- , addr2IntLit, int2AddrLit, float2DoubleLit, double2FloatLit
+ , nullAddrLit, float2DoubleLit, double2FloatLit
) where
#include "HsVersions.h"
| MachAddr Integer -- Whatever this machine thinks is a "pointer"
- | MachInt Integer -- Int# At least 32 bits
+ | MachInt Integer -- Int# At least WORD_SIZE_IN_BITS bits
| MachInt64 Integer -- Int64# At least 64 bits
- | MachWord Integer -- Word# At least 32 bits
+ | MachWord Integer -- Word# At least WORD_SIZE_IN_BITS bits
| MachWord64 Integer -- Word64# At least 64 bits
| MachFloat Rational
\begin{code}
mkMachInt, mkMachWord, mkMachInt64, mkMachWord64 :: Integer -> Literal
-mkMachInt x = ASSERT2( inIntRange x, integer x ) MachInt x
-mkMachWord x = ASSERT2( inWordRange x, integer x ) MachWord x
-mkMachInt64 x = MachInt64 x -- Assertions?
-mkMachWord64 x = MachWord64 x -- Ditto?
+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
inIntRange, inWordRange :: Integer -> Bool
inIntRange x = x >= tARGET_MIN_INT && x <= tARGET_MAX_INT
inCharRange :: Int -> Bool
inCharRange c = c >= 0 && c <= 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}
word2IntLit, int2WordLit,
- intToInt8Lit, intToInt16Lit, intToInt32Lit,
- wordToWord8Lit, wordToWord16Lit, wordToWord32Lit,
+ narrow8IntLit, narrow16IntLit, narrow32IntLit,
+ narrow8WordLit, narrow16WordLit, narrow32WordLit,
char2IntLit, int2CharLit,
float2IntLit, int2FloatLit, double2IntLit, int2DoubleLit,
- addr2IntLit, int2AddrLit, float2DoubleLit, double2FloatLit
+ float2DoubleLit, double2FloatLit
:: Literal -> Literal
word2IntLit (MachWord w)
| i < 0 = MachWord (1 + tARGET_MAX_WORD + i) -- (-1) ---> tARGET_MAX_WORD
| otherwise = MachWord i
-intToInt8Lit (MachInt i) = MachInt (toInteger (fromInteger i :: Int8))
-intToInt16Lit (MachInt i) = MachInt (toInteger (fromInteger i :: Int16))
-intToInt32Lit (MachInt i) = MachInt (toInteger (fromInteger i :: Int32))
-wordToWord8Lit (MachWord w) = MachWord (toInteger (fromInteger w :: Word8))
-wordToWord16Lit (MachWord w) = MachWord (toInteger (fromInteger w :: Word16))
-wordToWord32Lit (MachWord w) = MachWord (toInteger (fromInteger w :: Word32))
+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 c)
int2CharLit (MachInt i) = MachChar (fromInteger i)
double2IntLit (MachDouble f) = MachInt (truncate f)
int2DoubleLit (MachInt i) = MachDouble (fromInteger i)
-addr2IntLit (MachAddr a) = MachInt a
-int2AddrLit (MachInt i) = MachAddr i
-
float2DoubleLit (MachFloat f) = MachDouble f
double2FloatLit (MachDouble d) = MachFloat d
+
+nullAddrLit :: Literal
+nullAddrLit = MachAddr 0
\end{code}
Predicates