/ghc-7.0.4/compiler/cmm/PprC.hs
Haskell | 1123 lines | 716 code | 190 blank | 217 comment | 46 complexity | 3d1f7445f8e226894e6095627512bd2c MD5 | raw file
Possible License(s): BSD-3-Clause, BSD-2-Clause
- {-# OPTIONS -w #-}
- -- The above warning supression flag is a temporary kludge.
- -- While working on this module you are encouraged to remove it and fix
- -- any warnings in the module. See
- -- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
- -- for details
- -----------------------------------------------------------------------------
- --
- -- Pretty-printing of Cmm as C, suitable for feeding gcc
- --
- -- (c) The University of Glasgow 2004-2006
- --
- -----------------------------------------------------------------------------
- --
- -- Print Cmm as real C, for -fvia-C
- --
- -- See wiki:Commentary/Compiler/Backends/PprC
- --
- -- This is simpler than the old PprAbsC, because Cmm is "macro-expanded"
- -- relative to the old AbstractC, and many oddities/decorations have
- -- disappeared from the data type.
- --
- -- ToDo: save/restore volatile registers around calls.
- module PprC (
- writeCs,
- pprStringInCStyle
- ) where
- #include "HsVersions.h"
- -- Cmm stuff
- import BlockId
- import Cmm
- import PprCmm () -- Instances only
- import CLabel
- import ForeignCall
- import ClosureInfo
- -- Utils
- import DynFlags
- import Unique
- import UniqSet
- import UniqFM
- import FastString
- import Outputable
- import Constants
- import BasicTypes
- import CLabel
- -- The rest
- import Data.List
- import Data.Bits
- import Data.Char
- import System.IO
- import Data.Map (Map)
- import qualified Data.Map as Map
- import Data.Word
- import Data.Array.ST
- 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
- pprCs :: DynFlags -> [RawCmm] -> SDoc
- pprCs dflags cmms
- = pprCode CStyle (vcat $ map (\c -> split_marker $$ pprC c) cmms)
- where
- split_marker
- | dopt Opt_SplitObjs dflags = ptext (sLit "__STG_SPLIT_MARKER")
- | otherwise = empty
- writeCs :: DynFlags -> Handle -> [RawCmm] -> IO ()
- writeCs dflags handle cmms
- = printForC handle (pprCs dflags cmms)
- -- --------------------------------------------------------------------------
- -- Now do some real work
- --
- -- for fun, we could call cmmToCmm over the tops...
- --
- pprC :: RawCmm -> SDoc
- pprC (Cmm tops) = vcat $ intersperse blankLine $ map pprTop tops
- --
- -- top level procs
- --
- pprTop :: RawCmmTop -> SDoc
- pprTop (CmmProc info clbl _params (ListGraph blocks)) =
- (if not (null info)
- then pprDataExterns info $$
- pprWordArray (entryLblToInfoLbl clbl) info
- else empty) $$
- (case blocks of
- [] -> empty
- -- the first block doesn't get a label:
- (BasicBlock _ stmts : rest) -> vcat [
- blankLine,
- extern_decls,
- (if (externallyVisibleCLabel clbl)
- then mkFN_ else mkIF_) (pprCLabel clbl) <+> lbrace,
- nest 8 temp_decls,
- nest 8 mkFB_,
- nest 8 (vcat (map pprStmt stmts)) $$
- vcat (map pprBBlock rest),
- nest 8 mkFE_,
- rbrace ]
- )
- where
- (temp_decls, extern_decls) = pprTempAndExternDecls blocks
- -- Chunks of static data.
- -- We only handle (a) arrays of word-sized things and (b) strings.
- pprTop (CmmData _section _ds@[CmmDataLabel lbl, CmmString str]) =
- hcat [
- pprLocalness lbl, ptext (sLit "char "), pprCLabel lbl,
- ptext (sLit "[] = "), pprStringInCStyle str, semi
- ]
- pprTop (CmmData _section _ds@[CmmDataLabel lbl, CmmUninitialised size]) =
- hcat [
- pprLocalness lbl, ptext (sLit "char "), pprCLabel lbl,
- brackets (int size), semi
- ]
- pprTop top@(CmmData _section (CmmDataLabel lbl : lits)) =
- pprDataExterns lits $$
- pprWordArray lbl lits
- -- Floating info table for safe a foreign call.
- pprTop top@(CmmData _section d@(_ : _))
- | CmmDataLabel lbl : lits <- reverse d =
- let lits' = reverse lits
- in pprDataExterns lits' $$
- pprWordArray lbl lits'
- -- these shouldn't appear?
- pprTop (CmmData _ _) = panic "PprC.pprTop: can't handle this data"
- -- --------------------------------------------------------------------------
- -- BasicBlocks are self-contained entities: they always end in a jump.
- --
- -- Like nativeGen/AsmCodeGen, we could probably reorder blocks to turn
- -- as many jumps as possible into fall throughs.
- --
- pprBBlock :: CmmBasicBlock -> SDoc
- pprBBlock (BasicBlock lbl stmts) =
- if null stmts then
- pprTrace "pprC.pprBBlock: curious empty code block for"
- (pprBlockId lbl) empty
- else
- nest 4 (pprBlockId lbl <> colon) $$
- nest 8 (vcat (map pprStmt stmts))
- -- --------------------------------------------------------------------------
- -- Info tables. Just arrays of words.
- -- See codeGen/ClosureInfo, and nativeGen/PprMach
- pprWordArray :: CLabel -> [CmmStatic] -> SDoc
- pprWordArray lbl ds
- = hcat [ pprLocalness lbl, ptext (sLit "StgWord")
- , space, pprCLabel lbl, ptext (sLit "[] = {") ]
- $$ nest 8 (commafy (pprStatics ds))
- $$ ptext (sLit "};")
- --
- -- has to be static, if it isn't globally visible
- --
- pprLocalness :: CLabel -> SDoc
- pprLocalness lbl | not $ externallyVisibleCLabel lbl = ptext (sLit "static ")
- | otherwise = empty
- -- --------------------------------------------------------------------------
- -- Statements.
- --
- pprStmt :: CmmStmt -> SDoc
- pprStmt stmt = case stmt of
- CmmNop -> empty
- CmmComment s -> empty -- (hang (ptext (sLit "/*")) 3 (ftext s)) $$ ptext (sLit "*/")
- -- XXX if the string contains "*/", we need to fix it
- -- XXX we probably want to emit these comments when
- -- some debugging option is on. They can get quite
- -- large.
- CmmAssign dest src -> pprAssign dest src
- CmmStore dest src
- | typeWidth rep == W64 && wordWidth /= W64
- -> (if isFloatType rep then ptext (sLit "ASSIGN_DBL")
- else ptext (sLit ("ASSIGN_Word64"))) <>
- parens (mkP_ <> pprExpr1 dest <> comma <> pprExpr src) <> semi
- | otherwise
- -> hsep [ pprExpr (CmmLoad dest rep), equals, pprExpr src <> semi ]
- where
- rep = cmmExprType src
- CmmCall (CmmCallee fn cconv) results args safety ret ->
- maybe_proto $$
- fnCall
- where
- cast_fn = parens (cCast (pprCFunType (char '*') cconv results args) fn)
- real_fun_proto lbl = char ';' <>
- pprCFunType (pprCLabel lbl) cconv results args <>
- noreturn_attr <> semi
- fun_proto lbl = ptext (sLit ";EF_(") <>
- pprCLabel lbl <> char ')' <> semi
- noreturn_attr = case ret of
- CmmNeverReturns -> text "__attribute__ ((noreturn))"
- CmmMayReturn -> empty
- -- See wiki:Commentary/Compiler/Backends/PprC#Prototypes
- (maybe_proto, fnCall) =
- case fn of
- CmmLit (CmmLabel lbl)
- | StdCallConv <- cconv ->
- let myCall = pprCall (pprCLabel lbl) cconv results args safety
- in (real_fun_proto lbl, myCall)
- -- stdcall functions must be declared with
- -- a function type, otherwise the C compiler
- -- doesn't add the @n suffix to the label. We
- -- can't add the @n suffix ourselves, because
- -- it isn't valid C.
- | CmmNeverReturns <- ret ->
- let myCall = pprCall (pprCLabel lbl) cconv results args safety
- in (real_fun_proto lbl, myCall)
- | not (isMathFun lbl) ->
- let myCall = braces (
- pprCFunType (char '*' <> text "ghcFunPtr") cconv results args <> semi
- $$ text "ghcFunPtr" <+> equals <+> cast_fn <> semi
- $$ pprCall (text "ghcFunPtr") cconv results args safety <> semi
- )
- in (fun_proto lbl, myCall)
- _ ->
- (empty {- no proto -},
- pprCall cast_fn cconv results args safety <> semi)
- -- for a dynamic call, no declaration is necessary.
- CmmCall (CmmPrim op) results args safety _ret ->
- pprCall ppr_fn CCallConv results args safety
- where
- ppr_fn = pprCallishMachOp_for_C op
- CmmBranch ident -> pprBranch ident
- CmmCondBranch expr ident -> pprCondBranch expr ident
- CmmJump lbl _params -> mkJMP_(pprExpr lbl) <> semi
- CmmSwitch arg ids -> pprSwitch arg ids
- pprCFunType :: SDoc -> CCallConv -> HintedCmmFormals -> HintedCmmActuals -> SDoc
- pprCFunType ppr_fn cconv ress args
- = res_type ress <+>
- parens (text (ccallConvAttribute cconv) <> ppr_fn) <>
- parens (commafy (map arg_type args))
- where
- res_type [] = ptext (sLit "void")
- res_type [CmmHinted one hint] = machRepHintCType (localRegType one) hint
- arg_type (CmmHinted expr hint) = machRepHintCType (cmmExprType expr) hint
- -- ---------------------------------------------------------------------
- -- unconditional branches
- pprBranch :: BlockId -> SDoc
- pprBranch ident = ptext (sLit "goto") <+> pprBlockId ident <> semi
- -- ---------------------------------------------------------------------
- -- conditional branches to local labels
- pprCondBranch :: CmmExpr -> BlockId -> SDoc
- pprCondBranch expr ident
- = hsep [ ptext (sLit "if") , parens(pprExpr expr) ,
- ptext (sLit "goto") , (pprBlockId ident) <> semi ]
- -- ---------------------------------------------------------------------
- -- a local table branch
- --
- -- we find the fall-through cases
- --
- -- N.B. we remove Nothing's from the list of branches, as they are
- -- 'undefined'. However, they may be defined one day, so we better
- -- document this behaviour.
- --
- pprSwitch :: CmmExpr -> [ Maybe BlockId ] -> SDoc
- pprSwitch e maybe_ids
- = let pairs = [ (ix, ident) | (ix,Just ident) <- zip [0..] maybe_ids ]
- pairs2 = [ (map fst as, snd (head as)) | as <- groupBy sndEq pairs ]
- in
- (hang (ptext (sLit "switch") <+> parens ( pprExpr e ) <+> lbrace)
- 4 (vcat ( map caseify pairs2 )))
- $$ rbrace
- where
- sndEq (_,x) (_,y) = x == y
- -- fall through case
- caseify (ix:ixs, ident) = vcat (map do_fallthrough ixs) $$ final_branch ix
- where
- do_fallthrough ix =
- hsep [ ptext (sLit "case") , pprHexVal ix wordWidth <> colon ,
- ptext (sLit "/* fall through */") ]
- final_branch ix =
- hsep [ ptext (sLit "case") , pprHexVal ix wordWidth <> colon ,
- ptext (sLit "goto") , (pprBlockId ident) <> semi ]
- -- ---------------------------------------------------------------------
- -- Expressions.
- --
- -- C Types: the invariant is that the C expression generated by
- --
- -- pprExpr e
- --
- -- has a type in C which is also given by
- --
- -- machRepCType (cmmExprType e)
- --
- -- (similar invariants apply to the rest of the pretty printer).
- pprExpr :: CmmExpr -> SDoc
- pprExpr e = case e of
- CmmLit lit -> pprLit lit
- CmmLoad e ty -> pprLoad e ty
- CmmReg reg -> pprCastReg reg
- CmmRegOff reg 0 -> pprCastReg reg
- CmmRegOff reg i
- | i > 0 -> pprRegOff (char '+') i
- | otherwise -> pprRegOff (char '-') (-i)
- where
- pprRegOff op i' = pprCastReg reg <> op <> int i'
- CmmMachOp mop args -> pprMachOpApp mop args
- pprLoad :: CmmExpr -> CmmType -> SDoc
- pprLoad e ty
- | width == W64, wordWidth /= W64
- = (if isFloatType ty then ptext (sLit "PK_DBL")
- else ptext (sLit "PK_Word64"))
- <> parens (mkP_ <> pprExpr1 e)
- | otherwise
- = case e of
- CmmReg r | isPtrReg r && width == wordWidth && not (isFloatType ty)
- -> char '*' <> pprAsPtrReg r
- CmmRegOff r 0 | isPtrReg r && width == wordWidth && not (isFloatType ty)
- -> char '*' <> pprAsPtrReg r
- CmmRegOff r off | isPtrReg r && width == wordWidth
- , off `rem` wORD_SIZE == 0 && not (isFloatType ty)
- -- ToDo: check that the offset is a word multiple?
- -- (For tagging to work, I had to avoid unaligned loads. --ARY)
- -> pprAsPtrReg r <> brackets (ppr (off `shiftR` wordShift))
- _other -> cLoad e ty
- where
- width = typeWidth ty
- pprExpr1 :: CmmExpr -> SDoc
- pprExpr1 (CmmLit lit) = pprLit1 lit
- pprExpr1 e@(CmmReg _reg) = pprExpr e
- pprExpr1 other = parens (pprExpr other)
- -- --------------------------------------------------------------------------
- -- MachOp applications
- pprMachOpApp :: MachOp -> [CmmExpr] -> SDoc
- pprMachOpApp op args
- | isMulMayOfloOp op
- = ptext (sLit "mulIntMayOflo") <> parens (commafy (map pprExpr args))
- where isMulMayOfloOp (MO_U_MulMayOflo _) = True
- isMulMayOfloOp (MO_S_MulMayOflo _) = True
- 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
- -- unary
- [x] -> pprMachOp_for_C mop <> parens (pprArg x)
- _ -> panic "PprC.pprMachOp : machop with wrong number of args"
- where
- -- Cast needed for signed integer ops
- pprArg e | signedOp mop = cCast (machRep_S_CType (typeWidth (cmmExprType e))) e
- | needsFCasts mop = cCast (machRep_F_CType (typeWidth (cmmExprType e))) e
- | otherwise = pprExpr1 e
- needsFCasts (MO_F_Eq _) = False
- needsFCasts (MO_F_Ne _) = False
- needsFCasts (MO_F_Neg _) = True
- needsFCasts (MO_F_Quot _) = True
- needsFCasts mop = floatComparison mop
- -- --------------------------------------------------------------------------
- -- Literals
- pprLit :: CmmLit -> SDoc
- pprLit lit = case lit of
- CmmInt i rep -> pprHexVal i rep
- CmmFloat f w -> parens (machRep_F_CType w) <> str
- where d = fromRational f :: Double
- str | isInfinite d && d < 0 = ptext (sLit "-INFINITY")
- | isInfinite d = ptext (sLit "INFINITY")
- | isNaN d = ptext (sLit "NAN")
- | otherwise = text (show d)
- -- these constants come from <math.h>
- -- see #1861
- CmmBlock bid -> mkW_ <> pprCLabelAddr (infoTblLbl bid)
- CmmHighStackMark -> panic "PprC printing high stack mark"
- CmmLabel clbl -> mkW_ <> pprCLabelAddr clbl
- CmmLabelOff clbl i -> mkW_ <> pprCLabelAddr clbl <> char '+' <> int i
- CmmLabelDiffOff clbl1 clbl2 i
- -- WARNING:
- -- * the lit must occur in the info table clbl2
- -- * clbl1 must be an SRT, a slow entry point or a large bitmap
- -- The Mangler is expected to convert any reference to an SRT,
- -- a slow entry point or a large bitmap
- -- from an info table to an offset.
- -> mkW_ <> pprCLabelAddr clbl1 <> char '+' <> int i
- pprCLabelAddr lbl = char '&' <> pprCLabel lbl
- pprLit1 :: CmmLit -> SDoc
- pprLit1 lit@(CmmLabelOff _ _) = parens (pprLit lit)
- pprLit1 lit@(CmmLabelDiffOff _ _ _) = parens (pprLit lit)
- pprLit1 lit@(CmmFloat _ _) = parens (pprLit lit)
- pprLit1 other = pprLit other
- -- ---------------------------------------------------------------------------
- -- Static data
- pprStatics :: [CmmStatic] -> [SDoc]
- pprStatics [] = []
- pprStatics (CmmStaticLit (CmmFloat f W32) : rest)
- -- floats are padded to a word, see #1852
- | wORD_SIZE == 8, CmmStaticLit (CmmInt 0 W32) : rest' <- rest
- = pprLit1 (floatToWord f) : pprStatics rest'
- | wORD_SIZE == 4
- = pprLit1 (floatToWord f) : pprStatics rest
- | otherwise
- = pprPanic "pprStatics: float" (vcat (map (\(CmmStaticLit l) -> ppr (cmmLitType l)) rest))
- pprStatics (CmmStaticLit (CmmFloat f W64) : rest)
- = map pprLit1 (doubleToWords f) ++ pprStatics rest
- pprStatics (CmmStaticLit (CmmInt i W64) : rest)
- | wordWidth == W32
- #ifdef WORDS_BIGENDIAN
- = pprStatics (CmmStaticLit (CmmInt q W32) :
- CmmStaticLit (CmmInt r W32) : rest)
- #else
- = pprStatics (CmmStaticLit (CmmInt r W32) :
- CmmStaticLit (CmmInt q W32) : rest)
- #endif
- where r = i .&. 0xffffffff
- q = i `shiftR` 32
- pprStatics (CmmStaticLit (CmmInt i w) : rest)
- | w /= wordWidth
- = panic "pprStatics: cannot emit a non-word-sized static literal"
- pprStatics (CmmStaticLit lit : rest)
- = pprLit1 lit : pprStatics rest
- pprStatics (other : rest)
- = pprPanic "pprWord" (pprStatic other)
- pprStatic :: CmmStatic -> SDoc
- pprStatic s = case s of
- CmmStaticLit lit -> nest 4 (pprLit lit)
- CmmAlign i -> nest 4 (ptext (sLit "/* align */") <+> int i)
- CmmDataLabel clbl -> pprCLabel clbl <> colon
- CmmUninitialised i -> nest 4 (mkC_ <> brackets (int i))
- -- these should be inlined, like the old .hc
- CmmString s' -> nest 4 (mkW_ <> parens(pprStringInCStyle s'))
- -- ---------------------------------------------------------------------------
- -- Block Ids
- pprBlockId :: BlockId -> SDoc
- pprBlockId b = char '_' <> ppr (getUnique b)
- -- --------------------------------------------------------------------------
- -- Print a MachOp in a way suitable for emitting via C.
- --
- pprMachOp_for_C :: MachOp -> SDoc
- pprMachOp_for_C mop = case mop of
- -- Integer operations
- MO_Add _ -> char '+'
- MO_Sub _ -> char '-'
- MO_Eq _ -> ptext (sLit "==")
- MO_Ne _ -> ptext (sLit "!=")
- MO_Mul _ -> char '*'
- MO_S_Quot _ -> char '/'
- MO_S_Rem _ -> char '%'
- MO_S_Neg _ -> char '-'
- MO_U_Quot _ -> char '/'
- MO_U_Rem _ -> char '%'
- -- & Floating-point operations
- MO_F_Add _ -> char '+'
- MO_F_Sub _ -> char '-'
- MO_F_Neg _ -> char '-'
- MO_F_Mul _ -> char '*'
- MO_F_Quot _ -> char '/'
- -- Signed comparisons
- MO_S_Ge _ -> ptext (sLit ">=")
- MO_S_Le _ -> ptext (sLit "<=")
- MO_S_Gt _ -> char '>'
- MO_S_Lt _ -> char '<'
- -- & Unsigned comparisons
- MO_U_Ge _ -> ptext (sLit ">=")
- MO_U_Le _ -> ptext (sLit "<=")
- MO_U_Gt _ -> char '>'
- MO_U_Lt _ -> char '<'
- -- & Floating-point comparisons
- MO_F_Eq _ -> ptext (sLit "==")
- MO_F_Ne _ -> ptext (sLit "!=")
- MO_F_Ge _ -> ptext (sLit ">=")
- MO_F_Le _ -> ptext (sLit "<=")
- MO_F_Gt _ -> char '>'
- MO_F_Lt _ -> char '<'
- -- Bitwise operations. Not all of these may be supported at all
- -- sizes, and only integral MachReps are valid.
- MO_And _ -> char '&'
- MO_Or _ -> char '|'
- MO_Xor _ -> char '^'
- MO_Not _ -> char '~'
- MO_Shl _ -> ptext (sLit "<<")
- MO_U_Shr _ -> ptext (sLit ">>") -- unsigned shift right
- MO_S_Shr _ -> ptext (sLit ">>") -- signed shift right
- -- Conversions. Some of these will be NOPs, but never those that convert
- -- between ints and floats.
- -- Floating-point conversions use the signed variant.
- -- We won't know to generate (void*) casts here, but maybe from
- -- context elsewhere
- -- noop casts
- MO_UU_Conv from to | from == to -> empty
- MO_UU_Conv _from to -> parens (machRep_U_CType to)
- MO_SS_Conv from to | from == to -> empty
- MO_SS_Conv _from to -> parens (machRep_S_CType to)
- -- TEMPORARY: the old code didn't check this case, so let's leave it out
- -- to facilitate comparisons against the old output code.
- --MO_FF_Conv from to | from == to -> empty
- MO_FF_Conv _from to -> parens (machRep_F_CType to)
- MO_SF_Conv _from to -> parens (machRep_F_CType to)
- MO_FS_Conv _from to -> parens (machRep_S_CType to)
- _ -> pprTrace "offending mop" (ptext $ sLit $ show mop) $
- panic "PprC.pprMachOp_for_C: unknown machop"
- signedOp :: MachOp -> Bool -- Argument type(s) are signed ints
- signedOp (MO_S_Quot _) = True
- signedOp (MO_S_Rem _) = True
- signedOp (MO_S_Neg _) = True
- signedOp (MO_S_Ge _) = True
- signedOp (MO_S_Le _) = True
- signedOp (MO_S_Gt _) = True
- signedOp (MO_S_Lt _) = True
- signedOp (MO_S_Shr _) = True
- signedOp (MO_SS_Conv _ _) = True
- signedOp (MO_SF_Conv _ _) = True
- signedOp _ = False
- floatComparison :: MachOp -> Bool -- comparison between float args
- floatComparison (MO_F_Eq _) = True
- floatComparison (MO_F_Ne _) = True
- floatComparison (MO_F_Ge _) = True
- floatComparison (MO_F_Le _) = True
- floatComparison (MO_F_Gt _) = True
- floatComparison (MO_F_Lt _) = True
- floatComparison _ = False
- -- ---------------------------------------------------------------------
- -- tend to be implemented by foreign calls
- pprCallishMachOp_for_C :: CallishMachOp -> SDoc
- pprCallishMachOp_for_C mop
- = case mop of
- MO_F64_Pwr -> ptext (sLit "pow")
- MO_F64_Sin -> ptext (sLit "sin")
- MO_F64_Cos -> ptext (sLit "cos")
- MO_F64_Tan -> ptext (sLit "tan")
- MO_F64_Sinh -> ptext (sLit "sinh")
- MO_F64_Cosh -> ptext (sLit "cosh")
- MO_F64_Tanh -> ptext (sLit "tanh")
- MO_F64_Asin -> ptext (sLit "asin")
- MO_F64_Acos -> ptext (sLit "acos")
- MO_F64_Atan -> ptext (sLit "atan")
- MO_F64_Log -> ptext (sLit "log")
- MO_F64_Exp -> ptext (sLit "exp")
- MO_F64_Sqrt -> ptext (sLit "sqrt")
- MO_F32_Pwr -> ptext (sLit "powf")
- MO_F32_Sin -> ptext (sLit "sinf")
- MO_F32_Cos -> ptext (sLit "cosf")
- MO_F32_Tan -> ptext (sLit "tanf")
- MO_F32_Sinh -> ptext (sLit "sinhf")
- MO_F32_Cosh -> ptext (sLit "coshf")
- MO_F32_Tanh -> ptext (sLit "tanhf")
- MO_F32_Asin -> ptext (sLit "asinf")
- MO_F32_Acos -> ptext (sLit "acosf")
- MO_F32_Atan -> ptext (sLit "atanf")
- MO_F32_Log -> ptext (sLit "logf")
- MO_F32_Exp -> ptext (sLit "expf")
- MO_F32_Sqrt -> ptext (sLit "sqrtf")
- MO_WriteBarrier -> ptext (sLit "write_barrier")
- -- ---------------------------------------------------------------------
- -- Useful #defines
- --
- mkJMP_, mkFN_, mkIF_ :: SDoc -> SDoc
- mkJMP_ i = ptext (sLit "JMP_") <> parens i
- mkFN_ i = ptext (sLit "FN_") <> parens i -- externally visible function
- mkIF_ i = ptext (sLit "IF_") <> parens i -- locally visible
- mkFB_, mkFE_ :: SDoc
- mkFB_ = ptext (sLit "FB_") -- function code begin
- mkFE_ = ptext (sLit "FE_") -- function code end
- -- from includes/Stg.h
- --
- mkC_,mkW_,mkP_ :: SDoc
- mkC_ = ptext (sLit "(C_)") -- StgChar
- mkW_ = ptext (sLit "(W_)") -- StgWord
- mkP_ = ptext (sLit "(P_)") -- StgWord*
- -- ---------------------------------------------------------------------
- --
- -- Assignments
- --
- -- Generating assignments is what we're all about, here
- --
- pprAssign :: CmmReg -> CmmExpr -> SDoc
- -- dest is a reg, rhs is a reg
- pprAssign r1 (CmmReg 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)
- | isPtrReg r1 && isPtrReg r2 && (off `rem` wORD_SIZE == 0)
- = hcat [ pprAsPtrReg r1, equals, pprAsPtrReg r2, op, int off', semi ]
- where
- off1 = off `shiftR` wordShift
- (op,off') | off >= 0 = (char '+', off1)
- | otherwise = (char '-', -off1)
- -- dest is a reg, rhs is anything.
- -- 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
- | isFixedPtrReg r1 = mkAssign (mkP_ <> pprExpr1 r2)
- | Just ty <- strangeRegType r1 = mkAssign (parens ty <> pprExpr1 r2)
- | otherwise = mkAssign (pprExpr r2)
- where mkAssign x = if r1 == CmmGlobal BaseReg
- then ptext (sLit "ASSIGN_BaseReg") <> parens x <> semi
- else pprReg r1 <> ptext (sLit " = ") <> x <> semi
- -- ---------------------------------------------------------------------
- -- Registers
- pprCastReg reg
- | isStrangeTypeReg reg = mkW_ <> pprReg reg
- | otherwise = pprReg reg
- -- 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
- -- True if (pprAsPtrReg reg) will give an expression with type StgPtr
- -- JD: THIS IS HORRIBLE AND SHOULD BE RENAMED, AT THE VERY LEAST.
- -- THE GARBAGE WITH THE VNonGcPtr HELPS MATCH THE OLD CODE GENERATOR'S OUTPUT;
- -- I'M NOT SURE IF IT SHOULD REALLY STAY THAT WAY.
- isPtrReg :: CmmReg -> Bool
- isPtrReg (CmmLocal _) = False
- isPtrReg (CmmGlobal (VanillaReg n VGcPtr)) = True -- if we print via pprAsPtrReg
- isPtrReg (CmmGlobal (VanillaReg n VNonGcPtr)) = False --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 (cmmRegType reg)), so it has to be cast.
- isStrangeTypeReg :: CmmReg -> Bool
- isStrangeTypeReg (CmmLocal _) = False
- isStrangeTypeReg (CmmGlobal g) = isStrangeTypeGlobal g
- isStrangeTypeGlobal :: GlobalReg -> Bool
- isStrangeTypeGlobal CurrentTSO = True
- isStrangeTypeGlobal CurrentNursery = True
- isStrangeTypeGlobal BaseReg = True
- isStrangeTypeGlobal r = isFixedPtrGlobalReg r
- strangeRegType :: CmmReg -> Maybe SDoc
- strangeRegType (CmmGlobal CurrentTSO) = Just (ptext (sLit "struct StgTSO_ *"))
- strangeRegType (CmmGlobal CurrentNursery) = Just (ptext (sLit "struct bdescr_ *"))
- strangeRegType (CmmGlobal BaseReg) = Just (ptext (sLit "struct StgRegTable_ *"))
- strangeRegType _ = Nothing
- -- pprReg just prints the register name.
- --
- pprReg :: CmmReg -> SDoc
- pprReg r = case r of
- CmmLocal local -> pprLocalReg local
- CmmGlobal global -> pprGlobalReg global
-
- pprAsPtrReg :: CmmReg -> SDoc
- pprAsPtrReg (CmmGlobal (VanillaReg n gcp))
- = WARN( gcp /= VGcPtr, ppr n ) char 'R' <> int n <> ptext (sLit ".p")
- pprAsPtrReg other_reg = pprReg other_reg
- pprGlobalReg :: GlobalReg -> SDoc
- pprGlobalReg gr = case gr of
- VanillaReg n _ -> char 'R' <> int n <> ptext (sLit ".w")
- -- pprGlobalReg prints a VanillaReg as a .w regardless
- -- Example: R1.w = R1.w & (-0x8UL);
- -- JMP_(*R1.p);
- FloatReg n -> char 'F' <> int n
- DoubleReg n -> char 'D' <> int n
- LongReg n -> char 'L' <> int n
- Sp -> ptext (sLit "Sp")
- SpLim -> ptext (sLit "SpLim")
- Hp -> ptext (sLit "Hp")
- HpLim -> ptext (sLit "HpLim")
- CurrentTSO -> ptext (sLit "CurrentTSO")
- CurrentNursery -> ptext (sLit "CurrentNursery")
- HpAlloc -> ptext (sLit "HpAlloc")
- BaseReg -> ptext (sLit "BaseReg")
- EagerBlackholeInfo -> ptext (sLit "stg_EAGER_BLACKHOLE_info")
- GCEnter1 -> ptext (sLit "stg_gc_enter_1")
- GCFun -> ptext (sLit "stg_gc_fun")
- pprLocalReg :: LocalReg -> SDoc
- pprLocalReg (LocalReg uniq _) = char '_' <> ppr uniq
- -- -----------------------------------------------------------------------------
- -- Foreign Calls
- pprCall :: SDoc -> CCallConv -> HintedCmmFormals -> HintedCmmActuals -> CmmSafety
- -> SDoc
- pprCall ppr_fn cconv results args _
- | not (is_cish cconv)
- = panic "pprCall: unknown calling convention"
- | otherwise
- =
- #if x86_64_TARGET_ARCH
- -- HACK around gcc optimisations.
- -- x86_64 needs a __DISCARD__() here, to create a barrier between
- -- putting the arguments into temporaries and passing the arguments
- -- to the callee, because the argument expressions may refer to
- -- machine registers that are also used for passing arguments in the
- -- C calling convention.
- (if (not opt_Unregisterised)
- then ptext (sLit "__DISCARD__();")
- else empty) $$
- #endif
- ppr_assign results (ppr_fn <> parens (commafy (map pprArg args))) <> semi
- where
- ppr_assign [] rhs = rhs
- ppr_assign [CmmHinted one hint] rhs
- = pprLocalReg one <> ptext (sLit " = ")
- <> pprUnHint hint (localRegType one) <> rhs
- ppr_assign _other _rhs = panic "pprCall: multiple results"
- pprArg (CmmHinted expr AddrHint)
- = cCast (ptext (sLit "void *")) expr
- -- see comment by machRepHintCType below
- pprArg (CmmHinted expr SignedHint)
- = cCast (machRep_S_CType $ typeWidth $ cmmExprType expr) expr
- pprArg (CmmHinted expr _other)
- = pprExpr expr
- pprUnHint AddrHint rep = parens (machRepCType rep)
- pprUnHint SignedHint rep = parens (machRepCType rep)
- pprUnHint _ _ = empty
- pprGlobalRegName :: GlobalReg -> SDoc
- pprGlobalRegName gr = case gr of
- VanillaReg n _ -> char 'R' <> int n -- without the .w suffix
- _ -> pprGlobalReg gr
- -- Currently we only have these two calling conventions, but this might
- -- change in the future...
- is_cish CCallConv = True
- is_cish StdCallConv = True
- -- ---------------------------------------------------------------------
- -- Find and print local and external declarations for a list of
- -- Cmm statements.
- --
- pprTempAndExternDecls :: [CmmBasicBlock] -> (SDoc{-temps-}, SDoc{-externs-})
- pprTempAndExternDecls stmts
- = (vcat (map pprTempDecl (uniqSetToList temps)),
- vcat (map (pprExternDecl False{-ToDo-}) (Map.keys lbls)))
- where (temps, lbls) = runTE (mapM_ te_BB stmts)
- pprDataExterns :: [CmmStatic] -> SDoc
- pprDataExterns statics
- = vcat (map (pprExternDecl False{-ToDo-}) (Map.keys lbls))
- where (_, lbls) = runTE (mapM_ te_Static statics)
- pprTempDecl :: LocalReg -> SDoc
- pprTempDecl l@(LocalReg _ rep)
- = hcat [ machRepCType rep, space, pprLocalReg l, semi ]
- pprExternDecl :: Bool -> CLabel -> SDoc
- pprExternDecl in_srt lbl
- -- do not print anything for "known external" things
- | not (needsCDecl lbl) = empty
- | Just sz <- foreignLabelStdcallInfo lbl = stdcall_decl sz
- | otherwise =
- hcat [ visibility, label_type lbl,
- lparen, pprCLabel lbl, text ");" ]
- where
- label_type lbl | isCFunctionLabel lbl = ptext (sLit "F_")
- | otherwise = ptext (sLit "I_")
- visibility
- | externallyVisibleCLabel lbl = char 'E'
- | otherwise = char 'I'
- -- If the label we want to refer to is a stdcall function (on Windows) then
- -- we must generate an appropriate prototype for it, so that the C compiler will
- -- add the @n suffix to the label (#2276)
- stdcall_decl sz =
- ptext (sLit "extern __attribute__((stdcall)) void ") <> pprCLabel lbl
- <> parens (commafy (replicate (sz `quot` wORD_SIZE) (machRep_U_CType wordWidth)))
- <> semi
- type TEState = (UniqSet LocalReg, Map CLabel ())
- newtype TE a = TE { unTE :: TEState -> (a, TEState) }
- instance Monad TE where
- TE m >>= k = TE $ \s -> case m s of (a, s') -> unTE (k a) s'
- return a = TE $ \s -> (a, s)
- te_lbl :: CLabel -> TE ()
- te_lbl lbl = TE $ \(temps,lbls) -> ((), (temps, Map.insert lbl () lbls))
- te_temp :: LocalReg -> TE ()
- te_temp r = TE $ \(temps,lbls) -> ((), (addOneToUniqSet temps r, lbls))
- runTE :: TE () -> TEState
- runTE (TE m) = snd (m (emptyUniqSet, Map.empty))
- te_Static :: CmmStatic -> TE ()
- te_Static (CmmStaticLit lit) = te_Lit lit
- te_Static _ = return ()
- te_BB :: CmmBasicBlock -> TE ()
- te_BB (BasicBlock _ ss) = mapM_ te_Stmt ss
- te_Lit :: CmmLit -> TE ()
- te_Lit (CmmLabel l) = te_lbl l
- te_Lit (CmmLabelOff l _) = te_lbl l
- te_Lit (CmmLabelDiffOff l1 l2 _) = te_lbl l1
- 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_temp.hintlessCmm) rs >>
- mapM_ (te_Expr.hintlessCmm) es
- te_Stmt (CmmCondBranch e _) = te_Expr e
- te_Stmt (CmmSwitch e _) = te_Expr e
- te_Stmt (CmmJump e _) = te_Expr e
- te_Stmt _ = return ()
- te_Expr :: CmmExpr -> TE ()
- te_Expr (CmmLit lit) = te_Lit lit
- te_Expr (CmmLoad e _) = te_Expr e
- te_Expr (CmmReg r) = te_Reg r
- te_Expr (CmmMachOp _ es) = mapM_ te_Expr es
- te_Expr (CmmRegOff r _) = te_Reg r
- te_Reg :: CmmReg -> TE ()
- te_Reg (CmmLocal l) = te_temp l
- te_Reg _ = return ()
- -- ---------------------------------------------------------------------
- -- C types for MachReps
- cCast :: SDoc -> CmmExpr -> SDoc
- cCast ty expr = parens ty <> pprExpr1 expr
- cLoad :: CmmExpr -> CmmType -> 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
- isCmmWordType :: CmmType -> Bool
- -- True of GcPtrReg/NonGcReg of native word size
- isCmmWordType ty = not (isFloatType ty)
- && typeWidth ty == wordWidth
- -- 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.
- machRepHintCType :: CmmType -> ForeignHint -> SDoc
- machRepHintCType rep AddrHint = ptext (sLit "void *")
- machRepHintCType rep SignedHint = machRep_S_CType (typeWidth rep)
- machRepHintCType rep _other = machRepCType rep
- machRepPtrCType :: CmmType -> SDoc
- machRepPtrCType r | isCmmWordType r = ptext (sLit "P_")
- | otherwise = machRepCType r <> char '*'
- machRepCType :: CmmType -> SDoc
- machRepCType ty | isFloatType ty = machRep_F_CType w
- | otherwise = machRep_U_CType w
- where
- w = typeWidth ty
- machRep_F_CType :: Width -> SDoc
- machRep_F_CType W32 = ptext (sLit "StgFloat") -- ToDo: correct?
- machRep_F_CType W64 = ptext (sLit "StgDouble")
- machRep_F_CType _ = panic "machRep_F_CType"
- machRep_U_CType :: Width -> SDoc
- machRep_U_CType w | w == wordWidth = ptext (sLit "W_")
- machRep_U_CType W8 = ptext (sLit "StgWord8")
- machRep_U_CType W16 = ptext (sLit "StgWord16")
- machRep_U_CType W32 = ptext (sLit "StgWord32")
- machRep_U_CType W64 = ptext (sLit "StgWord64")
- machRep_U_CType _ = panic "machRep_U_CType"
- machRep_S_CType :: Width -> SDoc
- machRep_S_CType w | w == wordWidth = ptext (sLit "I_")
- machRep_S_CType W8 = ptext (sLit "StgInt8")
- machRep_S_CType W16 = ptext (sLit "StgInt16")
- machRep_S_CType W32 = ptext (sLit "StgInt32")
- machRep_S_CType W64 = ptext (sLit "StgInt64")
- machRep_S_CType _ = panic "machRep_S_CType"
-
- -- ---------------------------------------------------------------------
- -- print strings as valid C strings
- pprStringInCStyle :: [Word8] -> SDoc
- pprStringInCStyle s = doubleQuotes (text (concatMap charToC s))
- charToC :: Word8 -> String
- charToC w =
- case chr (fromIntegral w) of
- '\"' -> "\\\""
- '\'' -> "\\\'"
- '\\' -> "\\\\"
- c | c >= ' ' && c <= '~' -> [c]
- | otherwise -> ['\\',
- chr (ord '0' + ord c `div` 64),
- chr (ord '0' + ord c `div` 8 `mod` 8),
- chr (ord '0' + ord c `mod` 8)]
- -- ---------------------------------------------------------------------------
- -- Initialising static objects with floating-point numbers. We can't
- -- just emit the floating point number, because C will cast it to an int
- -- by rounding it. We want the actual bit-representation of the float.
- -- This is a hack to turn the floating point numbers into ints that we
- -- can safely initialise to static locations.
- big_doubles
- | widthInBytes W64 == 2 * wORD_SIZE = True
- | widthInBytes W64 == wORD_SIZE = False
- | otherwise = panic "big_doubles"
- 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
- -- floats are always 1 word
- floatToWord :: Rational -> CmmLit
- floatToWord r
- = runST (do
- arr <- newArray_ ((0::Int),0)
- writeArray arr 0 (fromRational r)
- arr' <- castFloatToIntArray arr
- i <- readArray arr' 0
- return (CmmInt (toInteger i) wordWidth)
- )
- doubleToWords :: Rational -> [CmmLit]
- doubleToWords r
- | big_doubles -- doubles are 2 words
- = runST (do
- arr <- newArray_ ((0::Int),1)
- writeArray arr 0 (fromRational r)
- arr' <- castDoubleToIntArray arr
- i1 <- readArray arr' 0
- i2 <- readArray arr' 1
- return [ CmmInt (toInteger i1) wordWidth
- , CmmInt (toInteger i2) wordWidth
- ]
- )
- | otherwise -- doubles are 1 word
- = runST (do
- arr <- newArray_ ((0::Int),0)
- writeArray arr 0 (fromRational r)
- arr' <- castDoubleToIntArray arr
- i <- readArray arr' 0
- return [ CmmInt (toInteger i) wordWidth ]
- )
- -- ---------------------------------------------------------------------------
- -- Utils
- wordShift :: Int
- wordShift = widthInLog wordWidth
- commafy :: [SDoc] -> SDoc
- commafy xs = hsep $ punctuate comma xs
- -- Print in C hex format: 0x13fa
- pprHexVal :: Integer -> Width -> SDoc
- pprHexVal 0 _ = ptext (sLit "0x0")
- pprHexVal w rep
- | w < 0 = parens (char '-' <> ptext (sLit "0x") <> go (-w) <> repsuffix rep)
- | otherwise = ptext (sLit "0x") <> go w <> repsuffix rep
- where
- -- type suffix for literals:
- -- Integer literals are unsigned in Cmm/C. We explicitly cast to
- -- signed values for doing signed operations, but at all other
- -- times values are unsigned. This also helps eliminate occasional
- -- warnings about integer overflow from gcc.
- -- on 32-bit platforms, add "ULL" to 64-bit literals
- repsuffix W64 | wORD_SIZE == 4 = ptext (sLit "ULL")
- -- on 64-bit platforms with 32-bit int, add "L" to 64-bit literals
- repsuffix W64 | cINT_SIZE == 4 = ptext (sLit "UL")
- repsuffix _ = char 'U'
-
- go 0 = empty
- go w' = go q <> dig
- where
- (q,r) = w' `quotRem` 16
- dig | r < 10 = char (chr (fromInteger r + ord '0'))
- | otherwise = char (chr (fromInteger r - 10 + ord 'a'))