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module GHC.StgToCmm.InfoTableProv (emitIpeBufferListNode) where
import GHC.Prelude
import GHC.Platform
import GHC.Unit.Module
import GHC.Utils.Outputable
import GHC.Types.SrcLoc (pprUserRealSpan, srcSpanFile)
import GHC.Data.FastString (fastStringToShortText, unpackFS, LexicalFastString(..))
import GHC.Cmm.CLabel
import GHC.Cmm.Expr
import GHC.Cmm.Utils
import GHC.StgToCmm.Config
import GHC.StgToCmm.Lit (newByteStringCLit)
import GHC.StgToCmm.Monad
import GHC.StgToCmm.Utils
import GHC.Data.ShortText (ShortText)
import qualified GHC.Data.ShortText as ST
import qualified Data.Map.Strict as M
import Control.Monad.Trans.State.Strict
import qualified Data.ByteString as BS
import qualified Data.ByteString.Builder as BSB
import qualified Data.ByteString.Lazy as BSL
emitIpeBufferListNode :: Module
-> [InfoProvEnt]
-> FCode ()
emitIpeBufferListNode _ [] = return ()
emitIpeBufferListNode this_mod ents = do
cfg <- getStgToCmmConfig
let ctx = stgToCmmContext cfg
platform = stgToCmmPlatform cfg
let (cg_ipes, strtab) = flip runState emptyStringTable $ do
module_name <- lookupStringTable $ ST.pack $ renderWithContext ctx (ppr this_mod)
mapM (toCgIPE platform ctx module_name) ents
let -- Emit the fields of an IpeBufferEntry struct.
toIpeBufferEntry :: CgInfoProvEnt -> [CmmLit]
toIpeBufferEntry cg_ipe =
[ CmmLabel (ipeInfoTablePtr cg_ipe)
, strtab_offset (ipeTableName cg_ipe)
, strtab_offset (ipeClosureDesc cg_ipe)
, strtab_offset (ipeTypeDesc cg_ipe)
, strtab_offset (ipeLabel cg_ipe)
, strtab_offset (ipeModuleName cg_ipe)
, strtab_offset (ipeSrcFile cg_ipe)
, strtab_offset (ipeSrcSpan cg_ipe)
, int32 0
]
int n = mkIntCLit platform n
int32 n = CmmInt n W32
strtab_offset (StrTabOffset n) = int32 (fromIntegral n)
strings <- newByteStringCLit (getStringTableStrings strtab)
let lits = [ zeroCLit platform -- 'next' field
, strings -- 'strings' field
, int $ length cg_ipes -- 'count' field
] ++ concatMap toIpeBufferEntry cg_ipes
emitDataLits (mkIPELabel this_mod) lits
toCgIPE :: Platform -> SDocContext -> StrTabOffset -> InfoProvEnt -> State StringTable CgInfoProvEnt
toCgIPE platform ctx module_name ipe = do
table_name <- lookupStringTable $ ST.pack $ renderWithContext ctx (pprCLabel platform (infoTablePtr ipe))
closure_desc <- lookupStringTable $ ST.pack $ show (infoProvEntClosureType ipe)
type_desc <- lookupStringTable $ ST.pack $ infoTableType ipe
let label_str = maybe "" ((\(LexicalFastString s) -> unpackFS s) . snd) (infoTableProv ipe)
let (src_loc_file, src_loc_span) =
case infoTableProv ipe of
Nothing -> (mempty, "")
Just (span, _) ->
let file = fastStringToShortText $ srcSpanFile span
coords = renderWithContext ctx (pprUserRealSpan False span)
in (file, coords)
label <- lookupStringTable $ ST.pack label_str
src_file <- lookupStringTable $ src_loc_file
src_span <- lookupStringTable $ ST.pack src_loc_span
return $ CgInfoProvEnt { ipeInfoTablePtr = infoTablePtr ipe
, ipeTableName = table_name
, ipeClosureDesc = closure_desc
, ipeTypeDesc = type_desc
, ipeLabel = label
, ipeModuleName = module_name
, ipeSrcFile = src_file
, ipeSrcSpan = src_span
}
data CgInfoProvEnt = CgInfoProvEnt
{ ipeInfoTablePtr :: !CLabel
, ipeTableName :: !StrTabOffset
, ipeClosureDesc :: !StrTabOffset
, ipeTypeDesc :: !StrTabOffset
, ipeLabel :: !StrTabOffset
, ipeModuleName :: !StrTabOffset
, ipeSrcFile :: !StrTabOffset
, ipeSrcSpan :: !StrTabOffset
}
data StringTable = StringTable { stStrings :: DList ShortText
, stLength :: !Int
, stLookup :: !(M.Map ShortText StrTabOffset)
}
newtype StrTabOffset = StrTabOffset Int
emptyStringTable :: StringTable
emptyStringTable =
StringTable { stStrings = emptyDList
, stLength = 0
, stLookup = M.empty
}
getStringTableStrings :: StringTable -> BS.ByteString
getStringTableStrings st =
BSL.toStrict $ BSB.toLazyByteString
$ foldMap f $ dlistToList (stStrings st)
where
f x = BSB.shortByteString (ST.contents x) `mappend` BSB.word8 0
lookupStringTable :: ShortText -> State StringTable StrTabOffset
lookupStringTable str = state $ \st ->
case M.lookup str (stLookup st) of
Just off -> (off, st)
Nothing ->
let !st' = st { stStrings = stStrings st `snoc` str
, stLength = stLength st + ST.byteLength str + 1
, stLookup = M.insert str res (stLookup st)
}
res = StrTabOffset (stLength st)
in (res, st')
newtype DList a = DList ([a] -> [a])
emptyDList :: DList a
emptyDList = DList id
snoc :: DList a -> a -> DList a
snoc (DList f) x = DList (f . (x:))
dlistToList :: DList a -> [a]
dlistToList (DList f) = f []
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