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{-# LANGUAGE DeriveGeneric #-}
module GHC.Exts.Heap.InfoTable.Types
( StgInfoTable(..)
, EntryFunPtr
, HalfWord
, ItblCodes
) where
#include "Rts.h"
import Prelude -- See note [Why do we import Prelude here?]
import GHC.Generics
import GHC.Exts.Heap.ClosureTypes
import Foreign
type ItblCodes = Either [Word8] [Word32]
#include "ghcautoconf.h"
-- Ultra-minimalist version specially for constructors
#if SIZEOF_VOID_P == 8
type HalfWord = Word32
#elif SIZEOF_VOID_P == 4
type HalfWord = Word16
#else
#error Unknown SIZEOF_VOID_P
#endif
type EntryFunPtr = FunPtr (Ptr () -> IO (Ptr ()))
-- | This is a somewhat faithful representation of an info table. See
-- <https://gitlab.haskell.org/ghc/ghc/blob/master/includes/rts/storage/InfoTables.h>
-- for more details on this data structure.
data StgInfoTable = StgInfoTable {
entry :: Maybe EntryFunPtr, -- Just <=> not TABLES_NEXT_TO_CODE
ptrs :: HalfWord,
nptrs :: HalfWord,
tipe :: ClosureType,
srtlen :: HalfWord,
code :: Maybe ItblCodes -- Just <=> TABLES_NEXT_TO_CODE
} deriving (Show, Generic)
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