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|
{-# LANGUAGE ScopedTypeVariables #-}
{-# OPTIONS_GHC -optc-DNON_POSIX_SOURCE #-}
--
-- (c) The University of Glasgow 2002-2006
--
-- | Generate infotables for interpreter-made bytecodes
module GHC.ByteCode.InfoTable ( mkITbls ) where
import GHC.Prelude
import GHC.Platform
import GHC.Platform.Profile
import GHC.ByteCode.Types
import GHC.Runtime.Interpreter
import GHC.Types.Name ( Name, getName )
import GHC.Types.Name.Env
import GHC.Types.RepType
import GHC.Core.DataCon ( DataCon, dataConRepArgTys, dataConIdentity )
import GHC.Core.TyCon ( TyCon, tyConFamilySize, isDataTyCon, tyConDataCons )
import GHC.Core.Multiplicity ( scaledThing )
import GHC.StgToCmm.Layout ( mkVirtConstrSizes )
import GHC.StgToCmm.Closure ( tagForCon, NonVoid (..) )
import GHC.Utils.Misc
import GHC.Utils.Panic
{-
Manufacturing of info tables for DataCons
-}
-- Make info tables for the data decls in this module
mkITbls :: Interp -> Profile -> [TyCon] -> IO ItblEnv
mkITbls interp profile tcs =
foldr plusNameEnv emptyNameEnv <$>
mapM mkITbl (filter isDataTyCon tcs)
where
mkITbl :: TyCon -> IO ItblEnv
mkITbl tc
| dcs `lengthIs` n -- paranoia; this is an assertion.
= make_constr_itbls interp profile dcs
where
dcs = tyConDataCons tc
n = tyConFamilySize tc
mkITbl _ = panic "mkITbl"
mkItblEnv :: [(Name,ItblPtr)] -> ItblEnv
mkItblEnv pairs = mkNameEnv [(n, (n,p)) | (n,p) <- pairs]
-- Assumes constructors are numbered from zero, not one
make_constr_itbls :: Interp -> Profile -> [DataCon] -> IO ItblEnv
make_constr_itbls interp profile cons =
-- TODO: the profile should be bundled with the interpreter: the rts ways are
-- fixed for an interpreter
mkItblEnv <$> mapM (uncurry mk_itbl) (zip cons [0..])
where
mk_itbl :: DataCon -> Int -> IO (Name,ItblPtr)
mk_itbl dcon conNo = do
let rep_args = [ NonVoid prim_rep
| arg <- dataConRepArgTys dcon
, prim_rep <- typePrimRep (scaledThing arg) ]
(tot_wds, ptr_wds) =
mkVirtConstrSizes profile rep_args
ptrs' = ptr_wds
nptrs' = tot_wds - ptr_wds
nptrs_really
| ptrs' + nptrs' >= pc_MIN_PAYLOAD_SIZE constants = nptrs'
| otherwise = pc_MIN_PAYLOAD_SIZE constants - ptrs'
descr = dataConIdentity dcon
platform = profilePlatform profile
constants = platformConstants platform
tables_next_to_code = platformTablesNextToCode platform
r <- interpCmd interp (MkConInfoTable tables_next_to_code ptrs' nptrs_really
conNo (tagForCon platform dcon) descr)
return (getName dcon, ItblPtr r)
|
