X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fcmm%2FPprC.hs;h=d9bdca5b832df41186a5af139918af59202bc399;hb=bd3a364da7956c269d31645995d0d775c52f6a84;hp=90599d74e9ac705098ba426ec66e56f6ae34ff18;hpb=8e7115fd48d87c44a262ce2349871be6b7b2ce81;p=ghc-hetmet.git diff --git a/compiler/cmm/PprC.hs b/compiler/cmm/PprC.hs index 90599d7..d9bdca5 100644 --- a/compiler/cmm/PprC.hs +++ b/compiler/cmm/PprC.hs @@ -51,15 +51,17 @@ import PprCmm () -- instances only -- import Debug.Trace #endif -#if __GLASGOW_HASKELL__ >= 504 import Data.Array.ST -#endif import Control.Monad.ST #if x86_64_TARGET_ARCH import StaticFlags ( opt_Unregisterised ) #endif +#if defined(alpha_TARGET_ARCH) || defined(mips_TARGET_ARCH) || defined(mipsel_TARGET_ARCH) || defined(arm_TARGET_ARCH) +#define BEWARE_LOAD_STORE_ALIGNMENT +#endif + -- -------------------------------------------------------------------------- -- Top level @@ -196,11 +198,11 @@ pprStmt stmt = case stmt of where rep = cmmExprRep src - CmmCall (CmmForeignCall fn cconv) results args volatile -> + CmmCall (CmmForeignCall fn cconv) results args -> -- Controversial: leave this out for now. -- pprUndef fn $$ - pprCall ppr_fn cconv results args volatile + pprCall ppr_fn cconv results args where ppr_fn = case fn of CmmLit (CmmLabel lbl) -> pprCLabel lbl @@ -217,8 +219,8 @@ pprStmt stmt = case stmt of ptext SLIT("#undef") <+> pprCLabel lbl pprUndef _ = empty - CmmCall (CmmPrim op) results args volatile -> - pprCall ppr_fn CCallConv results args volatile + CmmCall (CmmPrim op) results args -> + pprCall ppr_fn CCallConv results args where ppr_fn = pprCallishMachOp_for_C op @@ -325,7 +327,7 @@ pprExpr e = case e of CmmLoad expr rep -> -- the general case: - char '*' <> parens (cCast (machRepPtrCType rep) expr) + cLoad expr rep CmmReg reg -> pprCastReg reg CmmRegOff reg 0 -> pprCastReg reg @@ -356,6 +358,20 @@ pprMachOpApp op args isMulMayOfloOp _ = False pprMachOpApp mop args + | Just ty <- machOpNeedsCast mop + = ty <> parens (pprMachOpApp' mop args) + | otherwise + = pprMachOpApp' mop args + +-- Comparisons in C have type 'int', but we want type W_ (this is what +-- resultRepOfMachOp says). The other C operations inherit their type +-- from their operands, so no casting is required. +machOpNeedsCast :: MachOp -> Maybe SDoc +machOpNeedsCast mop + | isComparisonMachOp mop = Just mkW_ + | otherwise = Nothing + +pprMachOpApp' mop args = case args of -- dyadic [x,y] -> pprArg x <+> pprMachOp_for_C mop <+> pprArg y @@ -415,6 +431,9 @@ pprStatics (CmmStaticLit (CmmInt i I64) : rest) #endif where r = i .&. 0xffffffff q = i `shiftR` 32 +pprStatics (CmmStaticLit (CmmInt i rep) : rest) + | machRepByteWidth rep /= wORD_SIZE + = panic "pprStatics: cannot emit a non-word-sized static literal" pprStatics (CmmStaticLit lit : rest) = pprLit1 lit : pprStatics rest pprStatics (other : rest) @@ -595,18 +614,15 @@ pprAssign :: CmmReg -> CmmExpr -> SDoc -- dest is a reg, rhs is a reg pprAssign r1 (CmmReg r2) - | not (isStrangeTypeReg r1) && not (isStrangeTypeReg r2) - || isPtrReg r1 && isPtrReg r2 + | isPtrReg r1 && isPtrReg r2 = hcat [ pprAsPtrReg r1, equals, pprAsPtrReg r2, semi ] -- dest is a reg, rhs is a CmmRegOff pprAssign r1 (CmmRegOff r2 off) - | not (isStrangeTypeReg r1) && not (isStrangeTypeReg r2) - || isPtrReg r1 && isPtrReg r2 + | isPtrReg r1 && isPtrReg r2 && (off `rem` wORD_SIZE == 0) = hcat [ pprAsPtrReg r1, equals, pprAsPtrReg r2, op, int off', semi ] where - off1 | isPtrReg r2 = off `shiftR` wordShift - | otherwise = off + off1 = off `shiftR` wordShift (op,off') | off >= 0 = (char '+', off1) | otherwise = (char '-', -off1) @@ -615,8 +631,8 @@ pprAssign r1 (CmmRegOff r2 off) -- We can't cast the lvalue, so we have to cast the rhs if necessary. Casting -- the lvalue elicits a warning from new GCC versions (3.4+). pprAssign r1 r2 - | isPtrReg r1 - = pprAsPtrReg r1 <> ptext SLIT(" = ") <> mkP_ <> pprExpr1 r2 <> semi + | isFixedPtrReg r1 + = pprReg r1 <> ptext SLIT(" = ") <> mkP_ <> pprExpr1 r2 <> semi | Just ty <- strangeRegType r1 = pprReg r1 <> ptext SLIT(" = ") <> parens ty <> pprExpr1 r2 <> semi | otherwise @@ -629,20 +645,26 @@ pprCastReg reg | isStrangeTypeReg reg = mkW_ <> pprReg reg | otherwise = pprReg reg --- True if the register has type StgPtr in C, otherwise it has an --- integer type. We need to take care with pointer arithmetic on registers --- with type StgPtr. -isPtrReg :: CmmReg -> Bool -isPtrReg (CmmLocal _) = False -isPtrReg (CmmGlobal r) = isPtrGlobalReg r +-- True if (pprReg reg) will give an expression with type StgPtr. We +-- need to take care with pointer arithmetic on registers with type +-- StgPtr. +isFixedPtrReg :: CmmReg -> Bool +isFixedPtrReg (CmmLocal _) = False +isFixedPtrReg (CmmGlobal r) = isFixedPtrGlobalReg r -isPtrGlobalReg :: GlobalReg -> Bool -isPtrGlobalReg (VanillaReg n) = True -isPtrGlobalReg Sp = True -isPtrGlobalReg Hp = True -isPtrGlobalReg HpLim = True -isPtrGlobalReg SpLim = True -isPtrGlobalReg _ = False +-- True if (pprAsPtrReg reg) will give an expression with type StgPtr +isPtrReg :: CmmReg -> Bool +isPtrReg (CmmLocal _) = False +isPtrReg (CmmGlobal (VanillaReg n)) = True -- if we print via pprAsPtrReg +isPtrReg (CmmGlobal reg) = isFixedPtrGlobalReg reg + +-- True if this global reg has type StgPtr +isFixedPtrGlobalReg :: GlobalReg -> Bool +isFixedPtrGlobalReg Sp = True +isFixedPtrGlobalReg Hp = True +isFixedPtrGlobalReg HpLim = True +isFixedPtrGlobalReg SpLim = True +isFixedPtrGlobalReg _ = False -- True if in C this register doesn't have the type given by -- (machRepCType (cmmRegRep reg)), so it has to be cast. @@ -654,7 +676,7 @@ isStrangeTypeGlobal :: GlobalReg -> Bool isStrangeTypeGlobal CurrentTSO = True isStrangeTypeGlobal CurrentNursery = True isStrangeTypeGlobal BaseReg = True -isStrangeTypeGlobal r = isPtrGlobalReg r +isStrangeTypeGlobal r = isFixedPtrGlobalReg r strangeRegType :: CmmReg -> Maybe SDoc strangeRegType (CmmGlobal CurrentTSO) = Just (ptext SLIT("struct StgTSO_ *")) @@ -697,15 +719,14 @@ pprLocalReg (LocalReg uniq _rep) = char '_' <> ppr uniq -- Foreign Calls pprCall :: SDoc -> CCallConv -> [(CmmReg,MachHint)] -> [(CmmExpr,MachHint)] - -> Maybe [GlobalReg] -> SDoc + -> SDoc -pprCall ppr_fn cconv results args vols +pprCall ppr_fn cconv results args | not (is_cish cconv) = panic "pprCall: unknown calling convention" | otherwise - = save vols $$ - ptext SLIT("CALLER_SAVE_SYSTEM") $$ + = #if x86_64_TARGET_ARCH -- HACK around gcc optimisations. -- x86_64 needs a __DISCARD__() here, to create a barrier between @@ -717,9 +738,7 @@ pprCall ppr_fn cconv results args vols then ptext SLIT("__DISCARD__();") else empty) $$ #endif - ppr_assign results (ppr_fn <> parens (commafy (map pprArg args))) <> semi $$ - ptext SLIT("CALLER_RESTORE_SYSTEM") $$ - restore vols + ppr_assign results (ppr_fn <> parens (commafy (map pprArg args))) <> semi where ppr_assign [] rhs = rhs ppr_assign [(reg@(CmmGlobal BaseReg), hint)] rhs @@ -747,15 +766,6 @@ pprCall ppr_fn cconv results args vols pprUnHint SignedHint rep = parens (machRepCType rep) pprUnHint _ _ = empty - save = save_restore SLIT("CALLER_SAVE") - restore = save_restore SLIT("CALLER_RESTORE") - - -- Nothing says "I don't know what's live; save everything" - -- CALLER_SAVE_USER is defined in ghc/includes/Regs.h - save_restore txt Nothing = ptext txt <> ptext SLIT("_USER") - save_restore txt (Just these) = vcat (map saveRestoreGlobal these) - where saveRestoreGlobal r = ptext txt <> char '_' <> pprGlobalRegName r - pprGlobalRegName :: GlobalReg -> SDoc pprGlobalRegName gr = case gr of VanillaReg n -> char 'R' <> int n -- without the .w suffix @@ -837,7 +847,7 @@ te_Lit _ = return () te_Stmt :: CmmStmt -> TE () te_Stmt (CmmAssign r e) = te_Reg r >> te_Expr e te_Stmt (CmmStore l r) = te_Expr l >> te_Expr r -te_Stmt (CmmCall _ rs es _) = mapM_ (te_Reg.fst) rs >> +te_Stmt (CmmCall _ rs es) = mapM_ (te_Reg.fst) rs >> mapM_ (te_Expr.fst) es te_Stmt (CmmCondBranch e _) = te_Expr e te_Stmt (CmmSwitch e _) = te_Expr e @@ -862,6 +872,18 @@ te_Reg _ = return () cCast :: SDoc -> CmmExpr -> SDoc cCast ty expr = parens ty <> pprExpr1 expr +cLoad :: CmmExpr -> MachRep -> SDoc +#ifdef BEWARE_LOAD_STORE_ALIGNMENT +cLoad expr rep = + let decl = machRepCType rep <+> ptext SLIT("x") <> semi + struct = ptext SLIT("struct") <+> braces (decl) + packed_attr = ptext SLIT("__attribute__((packed))") + cast = parens (struct <+> packed_attr <> char '*') + in parens (cast <+> pprExpr1 expr) <> ptext SLIT("->x") +#else +cLoad expr rep = char '*' <> parens (cCast (machRepPtrCType rep) expr) +#endif + -- This is for finding the types of foreign call arguments. For a pointer -- argument, we always cast the argument to (void *), to avoid warnings from -- the C compiler. @@ -929,46 +951,20 @@ big_doubles | machRepByteWidth F64 == wORD_SIZE = False | otherwise = panic "big_doubles" -#if __GLASGOW_HASKELL__ >= 504 -newFloatArray :: (Int,Int) -> ST s (STUArray s Int Float) -newFloatArray = newArray_ - -newDoubleArray :: (Int,Int) -> ST s (STUArray s Int Double) -newDoubleArray = newArray_ - castFloatToIntArray :: STUArray s Int Float -> ST s (STUArray s Int Int) castFloatToIntArray = castSTUArray castDoubleToIntArray :: STUArray s Int Double -> ST s (STUArray s Int Int) castDoubleToIntArray = castSTUArray -writeFloatArray :: STUArray s Int Float -> Int -> Float -> ST s () -writeFloatArray = writeArray - -writeDoubleArray :: STUArray s Int Double -> Int -> Double -> ST s () -writeDoubleArray = writeArray - -readIntArray :: STUArray s Int Int -> Int -> ST s Int -readIntArray = readArray - -#else - -castFloatToIntArray :: MutableByteArray s t -> ST s (MutableByteArray s t) -castFloatToIntArray = return - -castDoubleToIntArray :: MutableByteArray s t -> ST s (MutableByteArray s t) -castDoubleToIntArray = return - -#endif - -- floats are always 1 word floatToWord :: Rational -> CmmLit floatToWord r = runST (do - arr <- newFloatArray ((0::Int),0) - writeFloatArray arr 0 (fromRational r) + arr <- newArray_ ((0::Int),0) + writeArray arr 0 (fromRational r) arr' <- castFloatToIntArray arr - i <- readIntArray arr' 0 + i <- readArray arr' 0 return (CmmInt (toInteger i) wordRep) ) @@ -976,21 +972,21 @@ doubleToWords :: Rational -> [CmmLit] doubleToWords r | big_doubles -- doubles are 2 words = runST (do - arr <- newDoubleArray ((0::Int),1) - writeDoubleArray arr 0 (fromRational r) + arr <- newArray_ ((0::Int),1) + writeArray arr 0 (fromRational r) arr' <- castDoubleToIntArray arr - i1 <- readIntArray arr' 0 - i2 <- readIntArray arr' 1 + i1 <- readArray arr' 0 + i2 <- readArray arr' 1 return [ CmmInt (toInteger i1) wordRep , CmmInt (toInteger i2) wordRep ] ) | otherwise -- doubles are 1 word = runST (do - arr <- newDoubleArray ((0::Int),0) - writeDoubleArray arr 0 (fromRational r) + arr <- newArray_ ((0::Int),0) + writeArray arr 0 (fromRational r) arr' <- castDoubleToIntArray arr - i <- readIntArray arr' 0 + i <- readArray arr' 0 return [ CmmInt (toInteger i) wordRep ] )