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{-# LANGUAGE CPP #-}
-- ----------------------------------------------------------------------------
-- | Handle conversion of CmmData to LLVM code.
--
module LlvmCodeGen.Data (
genLlvmData, genData
) where
#include "HsVersions.h"
import GhcPrelude
import Llvm
import LlvmCodeGen.Base
import BlockId
import CLabel
import Cmm
import DynFlags
import Platform
import FastString
import Outputable
import qualified Data.ByteString as BS
-- ----------------------------------------------------------------------------
-- * Constants
--
-- | The string appended to a variable name to create its structure type alias
structStr :: LMString
structStr = fsLit "_struct"
-- | The LLVM visibility of the label
linkage :: CLabel -> LlvmLinkageType
linkage lbl = if externallyVisibleCLabel lbl
then ExternallyVisible else Internal
-- ----------------------------------------------------------------------------
-- * Top level
--
-- | Pass a CmmStatic section to an equivalent Llvm code.
genLlvmData :: (Section, CmmStatics) -> LlvmM LlvmData
-- See note [emit-time elimination of static indirections] in CLabel.
genLlvmData (_, Statics alias [CmmStaticLit (CmmLabel lbl), CmmStaticLit ind, _, _])
| lbl == mkIndStaticInfoLabel
, let labelInd (CmmLabelOff l _) = Just l
labelInd (CmmLabel l) = Just l
labelInd _ = Nothing
, Just ind' <- labelInd ind
, alias `mayRedirectTo` ind' = do
label <- strCLabel_llvm alias
label' <- strCLabel_llvm ind'
let link = linkage alias
link' = linkage ind'
-- the LLVM type we give the alias is an empty struct type
-- but it doesn't really matter, as the pointer is only
-- used for (bit/int)casting.
tyAlias = LMAlias (label `appendFS` structStr, LMStructU [])
aliasDef = LMGlobalVar label tyAlias link Nothing Nothing Alias
-- we don't know the type of the indirectee here
indType = panic "will be filled by 'aliasify', later"
orig = LMStaticPointer $ LMGlobalVar label' indType link' Nothing Nothing Alias
pure ([LMGlobal aliasDef $ Just orig], [tyAlias])
genLlvmData (sec, Statics lbl xs) = do
label <- strCLabel_llvm lbl
static <- mapM genData xs
lmsec <- llvmSection sec
let types = map getStatType static
strucTy = LMStruct types
tyAlias = LMAlias (label `appendFS` structStr, strucTy)
struct = Just $ LMStaticStruc static tyAlias
link = linkage lbl
align = case sec of
Section CString _ -> Just 1
_ -> Nothing
const = if isSecConstant sec then Constant else Global
varDef = LMGlobalVar label tyAlias link lmsec align const
globDef = LMGlobal varDef struct
return ([globDef], [tyAlias])
-- | Format the section type part of a Cmm Section
llvmSectionType :: Platform -> SectionType -> FastString
llvmSectionType p t = case t of
Text -> fsLit ".text"
ReadOnlyData -> case platformOS p of
OSMinGW32 -> fsLit ".rdata"
_ -> fsLit ".rodata"
RelocatableReadOnlyData -> case platformOS p of
OSMinGW32 -> fsLit ".rdata$rel.ro"
_ -> fsLit ".data.rel.ro"
ReadOnlyData16 -> case platformOS p of
OSMinGW32 -> fsLit ".rdata$cst16"
_ -> fsLit ".rodata.cst16"
Data -> fsLit ".data"
UninitialisedData -> fsLit ".bss"
CString -> case platformOS p of
OSMinGW32 -> fsLit ".rdata$str"
_ -> fsLit ".rodata.str"
(OtherSection _) -> panic "llvmSectionType: unknown section type"
-- | Format a Cmm Section into a LLVM section name
llvmSection :: Section -> LlvmM LMSection
llvmSection (Section t suffix) = do
dflags <- getDynFlags
let splitSect = gopt Opt_SplitSections dflags
platform = targetPlatform dflags
if not splitSect
then return Nothing
else do
lmsuffix <- strCLabel_llvm suffix
let result sep = Just (concatFS [llvmSectionType platform t
, fsLit sep, lmsuffix])
case platformOS platform of
OSMinGW32 -> return (result "$")
_ -> return (result ".")
-- ----------------------------------------------------------------------------
-- * Generate static data
--
-- | Handle static data
genData :: CmmStatic -> LlvmM LlvmStatic
genData (CmmString str) = do
let v = map (\x -> LMStaticLit $ LMIntLit (fromIntegral x) i8)
(BS.unpack str)
ve = v ++ [LMStaticLit $ LMIntLit 0 i8]
return $ LMStaticArray ve (LMArray (length ve) i8)
genData (CmmUninitialised bytes)
= return $ LMUninitType (LMArray bytes i8)
genData (CmmStaticLit lit)
= genStaticLit lit
-- | Generate Llvm code for a static literal.
--
-- Will either generate the code or leave it unresolved if it is a 'CLabel'
-- which isn't yet known.
genStaticLit :: CmmLit -> LlvmM LlvmStatic
genStaticLit (CmmInt i w)
= return $ LMStaticLit (LMIntLit i (LMInt $ widthInBits w))
genStaticLit (CmmFloat r w)
= return $ LMStaticLit (LMFloatLit (fromRational r) (widthToLlvmFloat w))
genStaticLit (CmmVec ls)
= do sls <- mapM toLlvmLit ls
return $ LMStaticLit (LMVectorLit sls)
where
toLlvmLit :: CmmLit -> LlvmM LlvmLit
toLlvmLit lit = do
slit <- genStaticLit lit
case slit of
LMStaticLit llvmLit -> return llvmLit
_ -> panic "genStaticLit"
-- Leave unresolved, will fix later
genStaticLit cmm@(CmmLabel l) = do
var <- getGlobalPtr =<< strCLabel_llvm l
dflags <- getDynFlags
let ptr = LMStaticPointer var
lmty = cmmToLlvmType $ cmmLitType dflags cmm
return $ LMPtoI ptr lmty
genStaticLit (CmmLabelOff label off) = do
dflags <- getDynFlags
var <- genStaticLit (CmmLabel label)
let offset = LMStaticLit $ LMIntLit (toInteger off) (llvmWord dflags)
return $ LMAdd var offset
genStaticLit (CmmLabelDiffOff l1 l2 off w) = do
dflags <- getDynFlags
var1 <- genStaticLit (CmmLabel l1)
var2 <- genStaticLit (CmmLabel l2)
let var
| w == wordWidth dflags = LMSub var1 var2
| otherwise = LMTrunc (LMSub var1 var2) (widthToLlvmInt w)
offset = LMStaticLit $ LMIntLit (toInteger off) (LMInt $ widthInBits w)
return $ LMAdd var offset
genStaticLit (CmmBlock b) = genStaticLit $ CmmLabel $ infoTblLbl b
genStaticLit (CmmHighStackMark)
= panic "genStaticLit: CmmHighStackMark unsupported!"
|
