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|
{-# LANGUAGE CPP, MagicHash, ScopedTypeVariables #-}
{-# OPTIONS_GHC -optc-DNON_POSIX_SOURCE #-}
--
-- (c) The University of Glasgow 2002-2006
--
-- | ByteCodeItbls: Generate infotables for interpreter-made bytecodes
module ByteCodeItbls ( mkITbls ) where
#include "HsVersions.h"
import ByteCodeTypes
import GHCi
import DynFlags
import HscTypes
import Name ( Name, getName )
import NameEnv
import DataCon ( DataCon, dataConRepArgTys, dataConIdentity )
import TyCon ( TyCon, tyConFamilySize, isDataTyCon, tyConDataCons )
import Type ( flattenRepType, repType, typePrimRep )
import StgCmmLayout ( mkVirtHeapOffsets )
import Util
import Panic
{-
Manufacturing of info tables for DataCons
-}
-- Make info tables for the data decls in this module
mkITbls :: HscEnv -> [TyCon] -> IO ItblEnv
mkITbls hsc_env tcs =
foldr plusNameEnv emptyNameEnv <$>
mapM (mkITbl hsc_env) (filter isDataTyCon tcs)
where
mkITbl :: HscEnv -> TyCon -> IO ItblEnv
mkITbl hsc_env tc
| dcs `lengthIs` n -- paranoia; this is an assertion.
= make_constr_itbls hsc_env dcs
where
dcs = tyConDataCons tc
n = tyConFamilySize tc
mkITbl _ _ = panic "mkITbl"
mkItblEnv :: [(Name,ItblPtr)] -> ItblEnv
mkItblEnv pairs = mkNameEnv [(n, (n,p)) | (n,p) <- pairs]
-- Assumes constructors are numbered from zero, not one
make_constr_itbls :: HscEnv -> [DataCon] -> IO ItblEnv
make_constr_itbls hsc_env cons =
mkItblEnv <$> mapM (uncurry mk_itbl) (zip cons [0..])
where
dflags = hsc_dflags hsc_env
mk_itbl :: DataCon -> Int -> IO (Name,ItblPtr)
mk_itbl dcon conNo = do
let rep_args = [ (typePrimRep rep_arg,rep_arg)
| arg <- dataConRepArgTys dcon
, rep_arg <- flattenRepType (repType arg) ]
(tot_wds, ptr_wds, _) =
mkVirtHeapOffsets dflags False{-not a THUNK-} rep_args
ptrs' = ptr_wds
nptrs' = tot_wds - ptr_wds
nptrs_really
| ptrs' + nptrs' >= mIN_PAYLOAD_SIZE dflags = nptrs'
| otherwise = mIN_PAYLOAD_SIZE dflags - ptrs'
descr = dataConIdentity dcon
r <- iservCmd hsc_env (MkConInfoTable ptrs' nptrs_really conNo descr)
return (getName dcon, ItblPtr r)
|
