\section[Literal]{@Literal@: Machine literals (unboxed, of course)}
\begin{code}
-module Literal (
- Literal(..), -- Exported to ParseIface
- mkMachInt, mkMachWord,
- mkMachInt64, mkMachWord64,
- isLitLitLit,
- literalType, literalPrimRep,
- hashLiteral,
-
- inIntRange, inWordRange,
-
- word2IntLit, int2WordLit, int2CharLit,
- int2FloatLit, int2DoubleLit, char2IntLit
- ) where
+module Literal
+ ( Literal(..) -- Exported to ParseIface
+ , mkMachInt, mkMachWord
+ , mkMachInt64, mkMachWord64
+ , isLitLitLit, maybeLitLit, litSize, litIsDupable,
+ , literalType, literalPrimRep
+ , hashLiteral
+
+ , inIntRange, inWordRange, tARGET_MAX_INT, inCharRange
+
+ , word2IntLit, int2WordLit
+ , intToInt8Lit, intToInt16Lit, intToInt32Lit
+ , wordToWord8Lit, wordToWord16Lit, wordToWord32Lit
+ , char2IntLit, int2CharLit
+ , float2IntLit, int2FloatLit, double2IntLit, int2DoubleLit
+ , addr2IntLit, int2AddrLit, float2DoubleLit, double2FloatLit
+ ) where
#include "HsVersions.h"
import TysPrim ( charPrimTy, addrPrimTy, floatPrimTy, doublePrimTy,
intPrimTy, wordPrimTy, int64PrimTy, word64PrimTy
)
-import Name ( hashName )
import PrimRep ( PrimRep(..) )
-import TyCon ( isNewTyCon )
import Type ( Type, typePrimRep )
import PprType ( pprParendType )
-import Demand ( Demand )
-import CStrings ( charToC, charToEasyHaskell, pprFSInCStyle )
+import CStrings ( pprFSInCStyle )
import Outputable
+import FastTypes
import Util ( thenCmp )
-import Ratio ( numerator, denominator )
-import FastString ( uniqueOfFS )
+import Ratio ( numerator )
+import FastString ( uniqueOfFS, lengthFS )
+import Int ( Int8, Int16, Int32 )
+import Word ( Word8, Word16, Word32 )
import Char ( ord, chr )
-
-#if __GLASGOW_HASKELL__ >= 404
-import GlaExts ( fromInt )
-#endif
\end{code}
tARGET_MAX_INT = 2147483647
#endif
tARGET_MAX_WORD = (tARGET_MAX_INT * 2) + 1
+
+tARGET_MAX_CHAR :: Int
+tARGET_MAX_CHAR = 0x10ffff
\end{code}
data Literal
= ------------------
-- First the primitive guys
- MachChar Char
+ MachChar Int -- Char# At least 31 bits
| MachStr FAST_STRING
| MachAddr Integer -- Whatever this machine thinks is a "pointer"
| MachFloat Rational
| MachDouble Rational
- | MachLitLit FAST_STRING Type -- Type might be Add# or Int# etc
+ -- 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 FAST_STRING -- always an Addr#
+
+ -- 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 FAST_STRING Type -- Type might be Addr# or Int# etc
\end{code}
\begin{code}
inIntRange, inWordRange :: Integer -> Bool
inIntRange x = x >= tARGET_MIN_INT && x <= tARGET_MAX_INT
inWordRange x = x >= 0 && x <= tARGET_MAX_WORD
+
+inCharRange :: Int -> Bool
+inCharRange c = c >= 0 && c <= tARGET_MAX_CHAR
\end{code}
Coercions
~~~~~~~~~
\begin{code}
-word2IntLit, int2WordLit, int2CharLit, char2IntLit :: Literal -> Literal
-int2FloatLit, int2DoubleLit :: Literal -> Literal
+word2IntLit, int2WordLit,
+ intToInt8Lit, intToInt16Lit, intToInt32Lit,
+ wordToWord8Lit, wordToWord16Lit, wordToWord32Lit,
+ char2IntLit, int2CharLit,
+ float2IntLit, int2FloatLit, double2IntLit, int2DoubleLit,
+ addr2IntLit, int2AddrLit, float2DoubleLit, double2FloatLit
+ :: Literal -> Literal
word2IntLit (MachWord w)
- | w > tARGET_MAX_INT = MachInt ((-1) + tARGET_MAX_WORD - 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
-int2CharLit (MachInt i) = MachChar (chr (fromInteger i))
-char2IntLit (MachChar c) = MachInt (toInteger (ord c))
+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))
+
+char2IntLit (MachChar c) = MachInt (toInteger c)
+int2CharLit (MachInt i) = MachChar (fromInteger i)
-int2FloatLit (MachInt i) = MachFloat (fromInteger i)
-int2DoubleLit (MachInt i) = MachDouble (fromInteger i)
+float2IntLit (MachFloat f) = MachInt (truncate f)
+int2FloatLit (MachInt i) = MachFloat (fromInteger i)
+
+double2IntLit (MachFloat 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
\end{code}
Predicates
\begin{code}
isLitLitLit (MachLitLit _ _) = True
isLitLitLit _ = False
+
+maybeLitLit (MachLitLit s t) = Just (s,t)
+maybeLitLit _ = Nothing
+
+litIsDupable :: Literal -> Bool
+ -- True if code space does not go bad if we duplicate this literal
+ -- False principally of strings
+litIsDupable (MachStr _) = False
+litIsDupable other = True
+
+litSize :: Literal -> Int
+ -- used by CoreUnfold.sizeExpr
+litSize (MachStr str) = lengthFS str `div` 4
+litSize _other = 1
\end{code}
Types
literalType (MachWord64 _) = word64PrimTy
literalType (MachFloat _) = floatPrimTy
literalType (MachDouble _) = doublePrimTy
+literalType (MachLabel _) = addrPrimTy
literalType (MachLitLit _ ty) = ty
\end{code}
literalPrimRep (MachWord64 _) = Word64Rep
literalPrimRep (MachFloat _) = FloatRep
literalPrimRep (MachDouble _) = DoubleRep
+literalPrimRep (MachLabel _) = AddrRep
literalPrimRep (MachLitLit _ ty) = typePrimRep ty
\end{code}
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 (MachLitLit a b) (MachLitLit c d) = (a `compare` c) `thenCmp` (b `compare` d)
-cmpLit lit1 lit2 | litTag lit1 _LT_ litTag lit2 = LT
+cmpLit lit1 lit2 | litTag lit1 <# litTag lit2 = LT
| otherwise = GT
-litTag (MachChar _) = ILIT(1)
-litTag (MachStr _) = ILIT(2)
-litTag (MachAddr _) = 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 (MachLitLit _ _) = ILIT(10)
+litTag (MachChar _) = _ILIT(1)
+litTag (MachStr _) = _ILIT(2)
+litTag (MachAddr _) = _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)
\end{code}
Printing
pprLit lit
= getPprStyle $ \ sty ->
let
- code_style = codeStyle sty
+ code_style = codeStyle sty
+ iface_style = ifaceStyle sty
in
case lit of
- MachChar ch | code_style -> hcat [ptext SLIT("(C_)"), char '\'',
- text (charToC ch), char '\'']
- | ifaceStyle sty -> char '\'' <> text (charToEasyHaskell ch) <> char '\''
- | otherwise -> text ['\'', ch, '\'']
+ MachChar ch | code_style -> hcat [ptext SLIT("(C_)"), text (show ch)]
+ | otherwise -> pprHsChar ch
MachStr s | code_style -> pprFSInCStyle s
- | otherwise -> pprFSAsString s
+ | otherwise -> pprHsString s
+ -- Warning: printing MachStr in code_style assumes it contains
+ -- only characters '\0'..'\xFF'!
MachInt i | code_style && i == tARGET_MIN_INT -> parens (integer (i+1) <> text "-1")
-- Avoid a problem whereby gcc interprets
MachFloat f | code_style -> ptext SLIT("(StgFloat)") <> rational f
| otherwise -> ptext SLIT("__float") <+> rational f
- MachDouble d | ifaceStyle sty && d < 0 -> parens (rational d)
- | otherwise -> rational d
+ MachDouble d | iface_style && d < 0 -> parens (rational d)
+ | otherwise -> rational d
MachAddr p | code_style -> ptext SLIT("(void*)") <> integer p
| otherwise -> ptext SLIT("__addr") <+> integer p
- MachLitLit s ty | code_style -> ptext s
- | otherwise -> parens (hsep [ptext SLIT("__litlit"),
- pprFSAsString s,
- pprParendType ty])
+ MachLabel l | code_style -> ptext SLIT("(&") <> ptext l <> char ')'
+ | otherwise -> ptext SLIT("__label") <+> pprHsString l
+
+ MachLitLit s ty | code_style -> ptext s
+ | otherwise -> parens (hsep [ptext SLIT("__litlit"),
+ pprHsString s,
+ pprParendType ty])
pprIntVal :: Integer -> SDoc
-- Print negative integers with parens to be sure it's unambiguous
\begin{code}
hashLiteral :: Literal -> Int
-hashLiteral (MachChar c) = ord c + 1000 -- Keep it out of range of common ints
+hashLiteral (MachChar c) = c + 1000 -- Keep it out of range of common ints
hashLiteral (MachStr s) = hashFS s
hashLiteral (MachAddr i) = hashInteger i
hashLiteral (MachInt i) = hashInteger i
hashLiteral (MachWord64 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
-- since we use * to combine hash values
hashFS :: FAST_STRING -> Int
-hashFS s = IBOX( uniqueOfFS s )
+hashFS s = iBox (uniqueOfFS s)
\end{code}
projects / ghc-hetmet.git / blobdiff