%
% (c) The University of Glasgow 2002-2006
%
ByteCodeGen: Generate bytecode from Core
\begin{code}
module ByteCodeGen ( UnlinkedBCO, byteCodeGen, coreExprToBCOs ) where
#include "HsVersions.h"
import ByteCodeInstr
import ByteCodeItbls
import ByteCodeAsm
import ByteCodeLink
import LibFFI
import Outputable
import Name
import MkId
import Id
import ForeignCall
import HscTypes
import CoreUtils
import CoreSyn
import PprCore
import Literal
import PrimOp
import CoreFVs
import Type
import DataCon
import TyCon
import Util
import Var
import VarSet
import TysPrim
import DynFlags
import ErrUtils
import Unique
import FastString
import Panic
import SMRep
import Bitmap
import OrdList
import Constants
import Data.List
import Foreign
import Foreign.C
import Control.Monad ( when )
import Data.Char
import UniqSupply
import BreakArray
import Data.Maybe
import Module
import IdInfo
import Data.Map (Map)
import qualified Data.Map as Map
import qualified FiniteMap as Map
byteCodeGen :: DynFlags
-> [CoreBind]
-> [TyCon]
-> ModBreaks
-> IO CompiledByteCode
byteCodeGen dflags binds tycs modBreaks
= do showPass dflags "ByteCodeGen"
let flatBinds = [ (bndr, freeVars rhs)
| (bndr, rhs) <- flattenBinds binds]
us <- mkSplitUniqSupply 'y'
(BcM_State _us _final_ctr mallocd _, proto_bcos)
<- runBc us modBreaks (mapM schemeTopBind flatBinds)
when (notNull mallocd)
(panic "ByteCodeGen.byteCodeGen: missing final emitBc?")
dumpIfSet_dyn dflags Opt_D_dump_BCOs
"Proto-BCOs" (vcat (intersperse (char ' ') (map ppr proto_bcos)))
assembleBCOs proto_bcos tycs
coreExprToBCOs :: DynFlags
-> CoreExpr
-> IO UnlinkedBCO
coreExprToBCOs dflags expr
= do showPass dflags "ByteCodeGen"
let invented_name = mkSystemVarName (mkPseudoUniqueE 0) (fsLit "ExprTopLevel")
invented_id = Id.mkLocalId invented_name (panic "invented_id's type")
us <- mkSplitUniqSupply 'y'
(BcM_State _us _final_ctr mallocd _ , proto_bco)
<- runBc us emptyModBreaks (schemeTopBind (invented_id, freeVars expr))
when (notNull mallocd)
(panic "ByteCodeGen.coreExprToBCOs: missing final emitBc?")
dumpIfSet_dyn dflags Opt_D_dump_BCOs "Proto-BCOs" (ppr proto_bco)
assembleBCO proto_bco
type BCInstrList = OrdList BCInstr
type Sequel = Word16
type BCEnv = Map Id Word16
mkProtoBCO
:: name
-> BCInstrList
-> Either [AnnAlt Id VarSet] (AnnExpr Id VarSet)
-> Int
-> Word16
-> [StgWord]
-> Bool
-> [BcPtr]
-> ProtoBCO name
mkProtoBCO nm instrs_ordlist origin arity bitmap_size bitmap is_ret mallocd_blocks
= ProtoBCO {
protoBCOName = nm,
protoBCOInstrs = maybe_with_stack_check,
protoBCOBitmap = bitmap,
protoBCOBitmapSize = bitmap_size,
protoBCOArity = arity,
protoBCOExpr = origin,
protoBCOPtrs = mallocd_blocks
}
where
maybe_with_stack_check
| is_ret && stack_usage < fromIntegral aP_STACK_SPLIM = peep_d
| stack_usage >= fromIntegral iNTERP_STACK_CHECK_THRESH
= STKCHECK stack_usage : peep_d
| otherwise
= peep_d
stack_usage = sum (map bciStackUse peep_d)
peep_d = peep (fromOL instrs_ordlist)
peep (PUSH_L off1 : PUSH_L off2 : PUSH_L off3 : rest)
= PUSH_LLL off1 (off21) (off32) : peep rest
peep (PUSH_L off1 : PUSH_L off2 : rest)
= PUSH_LL off1 (off21) : peep rest
peep (i:rest)
= i : peep rest
peep []
= []
argBits :: [CgRep] -> [Bool]
argBits [] = []
argBits (rep : args)
| isFollowableArg rep = False : argBits args
| otherwise = take (cgRepSizeW rep) (repeat True) ++ argBits args
schemeTopBind :: (Id, AnnExpr Id VarSet) -> BcM (ProtoBCO Name)
schemeTopBind (id, rhs)
| Just data_con <- isDataConWorkId_maybe id,
isNullaryRepDataCon data_con = do
emitBc (mkProtoBCO (getName id) (toOL [PACK data_con 0, ENTER])
(Right rhs) 0 0 [] False)
| otherwise
= schemeR [] (id, rhs)
schemeR :: [Id]
-> (Id, AnnExpr Id VarSet)
-> BcM (ProtoBCO Name)
schemeR fvs (nm, rhs)
= schemeR_wrk fvs nm rhs (collect rhs)
collect :: AnnExpr Id VarSet -> ([Var], AnnExpr' Id VarSet)
collect (_, e) = go [] e
where
go xs e | Just e' <- bcView e = go xs e'
go xs (AnnLam x (_,e)) = go (x:xs) e
go xs not_lambda = (reverse xs, not_lambda)
schemeR_wrk :: [Id] -> Id -> AnnExpr Id VarSet -> ([Var], AnnExpr' Var VarSet) -> BcM (ProtoBCO Name)
schemeR_wrk fvs nm original_body (args, body)
= let
all_args = reverse args ++ fvs
arity = length all_args
szsw_args = map (fromIntegral . idSizeW) all_args
szw_args = sum szsw_args
p_init = Map.fromList (zip all_args (mkStackOffsets 0 szsw_args))
bits = argBits (reverse (map idCgRep all_args))
bitmap_size = genericLength bits
bitmap = mkBitmap bits
in do
body_code <- schemeER_wrk szw_args p_init body
emitBc (mkProtoBCO (getName nm) body_code (Right original_body)
arity bitmap_size bitmap False)
schemeER_wrk :: Word16 -> BCEnv -> AnnExpr' Id VarSet -> BcM BCInstrList
schemeER_wrk d p rhs
| Just (tickInfo, (_annot, newRhs)) <- isTickedExp' rhs = do
code <- schemeE d 0 p newRhs
arr <- getBreakArray
let idOffSets = getVarOffSets (fromIntegral d) p tickInfo
let tickNumber = tickInfo_number tickInfo
let breakInfo = BreakInfo
{ breakInfo_module = tickInfo_module tickInfo
, breakInfo_number = tickNumber
, breakInfo_vars = idOffSets
, breakInfo_resty = exprType (deAnnotate' newRhs)
}
let breakInstr = case arr of
BA arr# ->
BRK_FUN arr# (fromIntegral tickNumber) breakInfo
return $ breakInstr `consOL` code
| otherwise = schemeE d 0 p rhs
getVarOffSets :: Word16 -> BCEnv -> TickInfo -> [(Id, Word16)]
getVarOffSets d p = catMaybes . map (getOffSet d p) . tickInfo_locals
getOffSet :: Word16 -> BCEnv -> Id -> Maybe (Id, Word16)
getOffSet d env id
= case lookupBCEnv_maybe id env of
Nothing -> Nothing
Just offset -> Just (id, d offset)
fvsToEnv :: BCEnv -> VarSet -> [Id]
fvsToEnv p fvs = [v | v <- varSetElems fvs,
isId v,
v `Map.member` p]
data TickInfo
= TickInfo
{ tickInfo_number :: Int
, tickInfo_module :: Module
, tickInfo_locals :: [Id]
}
instance Outputable TickInfo where
ppr info = text "TickInfo" <+>
parens (int (tickInfo_number info) <+> ppr (tickInfo_module info) <+>
ppr (tickInfo_locals info))
schemeE :: Word16 -> Sequel -> BCEnv -> AnnExpr' Id VarSet -> BcM BCInstrList
schemeE d s p e
| Just e' <- bcView e
= schemeE d s p e'
schemeE d s p e@(AnnApp _ _)
= schemeT d s p e
schemeE d s p e@(AnnVar v)
| not (isUnLiftedType v_type)
=
schemeT d s p e
| otherwise
= do
(push, szw) <- pushAtom d p (AnnVar v)
return (push
`appOL` mkSLIDE szw (ds)
`snocOL` RETURN_UBX v_rep)
where
v_type = idType v
v_rep = typeCgRep v_type
schemeE d s p (AnnLit literal)
= do (push, szw) <- pushAtom d p (AnnLit literal)
let l_rep = typeCgRep (literalType literal)
return (push
`appOL` mkSLIDE szw (ds)
`snocOL` RETURN_UBX l_rep)
schemeE d s p (AnnLet (AnnNonRec x (_,rhs)) (_,body))
| (AnnVar v, args_r_to_l) <- splitApp rhs,
Just data_con <- isDataConWorkId_maybe v,
dataConRepArity data_con == length args_r_to_l
= do
alloc_code <- mkConAppCode d s p data_con args_r_to_l
body_code <- schemeE (d+1) s (Map.insert x d p) body
return (alloc_code `appOL` body_code)
schemeE d s p (AnnLet binds (_,body))
= let (xs,rhss) = case binds of AnnNonRec x rhs -> ([x],[rhs])
AnnRec xs_n_rhss -> unzip xs_n_rhss
n_binds = genericLength xs
fvss = map (fvsToEnv p' . fst) rhss
sizes = map (\rhs_fvs -> sum (map (fromIntegral . idSizeW) rhs_fvs)) fvss
arities = map (genericLength . fst . collect) rhss
p' = Map.insertList (zipE xs (mkStackOffsets d (genericReplicate n_binds 1))) p
d' = d + n_binds
zipE = zipEqual "schemeE"
build_thunk _ [] size bco off arity
= return (PUSH_BCO bco `consOL` unitOL (mkap (off+size) size))
where
mkap | arity == 0 = MKAP
| otherwise = MKPAP
build_thunk dd (fv:fvs) size bco off arity = do
(push_code, pushed_szw) <- pushAtom dd p' (AnnVar fv)
more_push_code <- build_thunk (dd+pushed_szw) fvs size bco off arity
return (push_code `appOL` more_push_code)
alloc_code = toOL (zipWith mkAlloc sizes arities)
where mkAlloc sz 0
| is_tick = ALLOC_AP_NOUPD sz
| otherwise = ALLOC_AP sz
mkAlloc sz arity = ALLOC_PAP arity sz
is_tick = case binds of
AnnNonRec id _ -> occNameFS (getOccName id) == tickFS
_other -> False
compile_bind d' fvs x rhs size arity off = do
bco <- schemeR fvs (x,rhs)
build_thunk d' fvs size bco off arity
compile_binds =
[ compile_bind d' fvs x rhs size arity n
| (fvs, x, rhs, size, arity, n) <-
zip6 fvss xs rhss sizes arities [n_binds, n_binds1 .. 1]
]
in do
body_code <- schemeE d' s p' body
thunk_codes <- sequence compile_binds
return (alloc_code `appOL` concatOL thunk_codes `appOL` body_code)
schemeE d s p exp@(AnnCase {})
| Just (_tickInfo, _rhs) <- isTickedExp' exp
= if isUnLiftedType ty
then do
id <- newId (mkFunTy realWorldStatePrimTy ty)
st <- newId realWorldStatePrimTy
let letExp = AnnLet (AnnNonRec id (fvs, AnnLam st (emptyVarSet, exp)))
(emptyVarSet, (AnnApp (emptyVarSet, AnnVar id)
(emptyVarSet, AnnVar realWorldPrimId)))
schemeE d s p letExp
else do
id <- newId ty
let letExp = AnnLet (AnnNonRec id (fvs, exp)) (emptyVarSet, AnnVar id)
schemeE d s p letExp
where exp' = deAnnotate' exp
fvs = exprFreeVars exp'
ty = exprType exp'
schemeE d s p (AnnCase scrut _ _ [(DataAlt dc, [bind1, bind2], rhs)])
| isUnboxedTupleCon dc, VoidArg <- typeCgRep (idType bind1)
=
doCase d s p scrut bind2 [(DEFAULT, [], rhs)] True
| isUnboxedTupleCon dc, VoidArg <- typeCgRep (idType bind2)
=
doCase d s p scrut bind1 [(DEFAULT, [], rhs)] True
schemeE d s p (AnnCase scrut _ _ [(DataAlt dc, [bind1], rhs)])
| isUnboxedTupleCon dc
=
doCase d s p scrut bind1 [(DEFAULT, [], rhs)] True
schemeE d s p (AnnCase scrut bndr _ alts)
= doCase d s p scrut bndr alts False
schemeE _ _ _ expr
= pprPanic "ByteCodeGen.schemeE: unhandled case"
(pprCoreExpr (deAnnotate' expr))
isTickedExp' :: AnnExpr' Id a -> Maybe (TickInfo, AnnExpr Id a)
isTickedExp' (AnnCase scrut _bndr _type alts)
| Just tickInfo <- isTickedScrut scrut,
[(DEFAULT, _bndr, rhs)] <- alts
= Just (tickInfo, rhs)
where
isTickedScrut :: (AnnExpr Id a) -> Maybe TickInfo
isTickedScrut expr
| Var id <- f,
Just (TickBox modName tickNumber) <- isTickBoxOp_maybe id
= Just $ TickInfo { tickInfo_number = tickNumber
, tickInfo_module = modName
, tickInfo_locals = idsOfArgs args
}
| otherwise = Nothing
where
(f, args) = collectArgs $ deAnnotate expr
idsOfArgs :: [Expr Id] -> [Id]
idsOfArgs = catMaybes . map exprId
exprId :: Expr Id -> Maybe Id
exprId (Var id) = Just id
exprId _ = Nothing
isTickedExp' _ = Nothing
schemeT :: Word16
-> Sequel
-> BCEnv
-> AnnExpr' Id VarSet
-> BcM BCInstrList
schemeT d s p app
| Just (arg, constr_names) <- maybe_is_tagToEnum_call
= do (push, arg_words) <- pushAtom d p arg
tagToId_sequence <- implement_tagToId constr_names
return (push `appOL` tagToId_sequence
`appOL` mkSLIDE 1 (d+arg_wordss)
`snocOL` ENTER)
| Just (CCall ccall_spec) <- isFCallId_maybe fn
= generateCCall d s p ccall_spec fn args_r_to_l
| Just con <- maybe_saturated_dcon,
isUnboxedTupleCon con
= case args_r_to_l of
[arg1,arg2] | isVoidArgAtom arg1 ->
unboxedTupleReturn d s p arg2
[arg1,arg2] | isVoidArgAtom arg2 ->
unboxedTupleReturn d s p arg1
_other -> unboxedTupleException
| Just con <- maybe_saturated_dcon
= do alloc_con <- mkConAppCode d s p con args_r_to_l
return (alloc_con `appOL`
mkSLIDE 1 (d s) `snocOL`
ENTER)
| otherwise
= doTailCall d s p fn args_r_to_l
where
maybe_is_tagToEnum_call
= let extract_constr_Names ty
| Just (tyc, _) <- splitTyConApp_maybe (repType ty),
isDataTyCon tyc
= map (getName . dataConWorkId) (tyConDataCons tyc)
| otherwise
= pprPanic "maybe_is_tagToEnum_call.extract_constr_Ids" (ppr ty)
in
case app of
(AnnApp (_, AnnApp (_, AnnVar v) (_, AnnType t)) arg)
-> case isPrimOpId_maybe v of
Just TagToEnumOp -> Just (snd arg, extract_constr_Names t)
_ -> Nothing
_ -> Nothing
(AnnVar fn, args_r_to_l) = splitApp app
n_args = length args_r_to_l
maybe_saturated_dcon
= case isDataConWorkId_maybe fn of
Just con | dataConRepArity con == n_args -> Just con
_ -> Nothing
mkConAppCode :: Word16 -> Sequel -> BCEnv
-> DataCon
-> [AnnExpr' Id VarSet]
-> BcM BCInstrList
mkConAppCode _ _ _ con []
= ASSERT( isNullaryRepDataCon con )
return (unitOL (PUSH_G (getName (dataConWorkId con))))
mkConAppCode orig_d _ p con args_r_to_l
= ASSERT( dataConRepArity con == length args_r_to_l )
do_pushery orig_d (non_ptr_args ++ ptr_args)
where
(ptr_args, non_ptr_args) = partition isPtrAtom args_r_to_l
do_pushery d (arg:args)
= do (push, arg_words) <- pushAtom d p arg
more_push_code <- do_pushery (d+arg_words) args
return (push `appOL` more_push_code)
do_pushery d []
= return (unitOL (PACK con n_arg_words))
where
n_arg_words = d orig_d
unboxedTupleReturn
:: Word16 -> Sequel -> BCEnv
-> AnnExpr' Id VarSet -> BcM BCInstrList
unboxedTupleReturn d s p arg = do
(push, sz) <- pushAtom d p arg
return (push `appOL`
mkSLIDE sz (ds) `snocOL`
RETURN_UBX (atomRep arg))
doTailCall
:: Word16 -> Sequel -> BCEnv
-> Id -> [AnnExpr' Id VarSet]
-> BcM BCInstrList
doTailCall init_d s p fn args
= do_pushes init_d args (map atomRep args)
where
do_pushes d [] reps = do
ASSERT( null reps ) return ()
(push_fn, sz) <- pushAtom d p (AnnVar fn)
ASSERT( sz == 1 ) return ()
return (push_fn `appOL` (
mkSLIDE ((dinit_d) + 1) (init_d s) `appOL`
unitOL ENTER))
do_pushes d args reps = do
let (push_apply, n, rest_of_reps) = findPushSeq reps
(these_args, rest_of_args) = splitAt n args
(next_d, push_code) <- push_seq d these_args
instrs <- do_pushes (next_d + 1) rest_of_args rest_of_reps
return (push_code `appOL` (push_apply `consOL` instrs))
push_seq d [] = return (d, nilOL)
push_seq d (arg:args) = do
(push_code, sz) <- pushAtom d p arg
(final_d, more_push_code) <- push_seq (d+sz) args
return (final_d, push_code `appOL` more_push_code)
findPushSeq :: [CgRep] -> (BCInstr, Int, [CgRep])
findPushSeq (PtrArg: PtrArg: PtrArg: PtrArg: PtrArg: PtrArg: rest)
= (PUSH_APPLY_PPPPPP, 6, rest)
findPushSeq (PtrArg: PtrArg: PtrArg: PtrArg: PtrArg: rest)
= (PUSH_APPLY_PPPPP, 5, rest)
findPushSeq (PtrArg: PtrArg: PtrArg: PtrArg: rest)
= (PUSH_APPLY_PPPP, 4, rest)
findPushSeq (PtrArg: PtrArg: PtrArg: rest)
= (PUSH_APPLY_PPP, 3, rest)
findPushSeq (PtrArg: PtrArg: rest)
= (PUSH_APPLY_PP, 2, rest)
findPushSeq (PtrArg: rest)
= (PUSH_APPLY_P, 1, rest)
findPushSeq (VoidArg: rest)
= (PUSH_APPLY_V, 1, rest)
findPushSeq (NonPtrArg: rest)
= (PUSH_APPLY_N, 1, rest)
findPushSeq (FloatArg: rest)
= (PUSH_APPLY_F, 1, rest)
findPushSeq (DoubleArg: rest)
= (PUSH_APPLY_D, 1, rest)
findPushSeq (LongArg: rest)
= (PUSH_APPLY_L, 1, rest)
findPushSeq _
= panic "ByteCodeGen.findPushSeq"
doCase :: Word16 -> Sequel -> BCEnv
-> AnnExpr Id VarSet -> Id -> [AnnAlt Id VarSet]
-> Bool
-> BcM BCInstrList
doCase d s p (_,scrut) bndr alts is_unboxed_tuple
= let
ret_frame_sizeW = 2
unlifted_itbl_sizeW | isAlgCase = 0
| otherwise = 1
d_bndr = d + ret_frame_sizeW + fromIntegral (idSizeW bndr)
d_alts = d_bndr + unlifted_itbl_sizeW
p_alts = Map.insert bndr (d_bndr 1) p
bndr_ty = idType bndr
isAlgCase = not (isUnLiftedType bndr_ty) && not is_unboxed_tuple
codeAlt (DEFAULT, _, (_,rhs))
= do rhs_code <- schemeE d_alts s p_alts rhs
return (NoDiscr, rhs_code)
codeAlt alt@(_, bndrs, (_,rhs))
| null real_bndrs = do
rhs_code <- schemeE d_alts s p_alts rhs
return (my_discr alt, rhs_code)
| otherwise =
let
(ptrs,nptrs) = partition (isFollowableArg.idCgRep) real_bndrs
ptr_sizes = map (fromIntegral . idSizeW) ptrs
nptrs_sizes = map (fromIntegral . idSizeW) nptrs
bind_sizes = ptr_sizes ++ nptrs_sizes
size = sum ptr_sizes + sum nptrs_sizes
p' = Map.insertList
(zip (reverse (ptrs ++ nptrs))
(mkStackOffsets d_alts (reverse bind_sizes)))
p_alts
in do
MASSERT(isAlgCase)
rhs_code <- schemeE (d_alts+size) s p' rhs
return (my_discr alt, unitOL (UNPACK size) `appOL` rhs_code)
where
real_bndrs = filter (not.isTyCoVar) bndrs
my_discr (DEFAULT, _, _) = NoDiscr
my_discr (DataAlt dc, _, _)
| isUnboxedTupleCon dc
= unboxedTupleException
| otherwise
= DiscrP (fromIntegral (dataConTag dc fIRST_TAG))
my_discr (LitAlt l, _, _)
= case l of MachInt i -> DiscrI (fromInteger i)
MachWord w -> DiscrW (fromInteger w)
MachFloat r -> DiscrF (fromRational r)
MachDouble r -> DiscrD (fromRational r)
MachChar i -> DiscrI (ord i)
_ -> pprPanic "schemeE(AnnCase).my_discr" (ppr l)
maybe_ncons
| not isAlgCase = Nothing
| otherwise
= case [dc | (DataAlt dc, _, _) <- alts] of
[] -> Nothing
(dc:_) -> Just (tyConFamilySize (dataConTyCon dc))
bitmap_size = ds
bitmap_size' :: Int
bitmap_size' = fromIntegral bitmap_size
bitmap = intsToReverseBitmap bitmap_size'
(sortLe (<=) (filter (< bitmap_size') rel_slots))
where
binds = Map.toList p
rel_slots = map fromIntegral $ concat (map spread binds)
spread (id, offset)
| isFollowableArg (idCgRep id) = [ rel_offset ]
| otherwise = []
where rel_offset = d offset 1
in do
alt_stuff <- mapM codeAlt alts
alt_final <- mkMultiBranch maybe_ncons alt_stuff
let
alt_bco_name = getName bndr
alt_bco = mkProtoBCO alt_bco_name alt_final (Left alts)
0 bitmap_size bitmap True
scrut_code <- schemeE (d + ret_frame_sizeW) (d + ret_frame_sizeW) p scrut
alt_bco' <- emitBc alt_bco
let push_alts
| isAlgCase = PUSH_ALTS alt_bco'
| otherwise = PUSH_ALTS_UNLIFTED alt_bco' (typeCgRep bndr_ty)
return (push_alts `consOL` scrut_code)
generateCCall :: Word16 -> Sequel
-> BCEnv
-> CCallSpec
-> Id
-> [AnnExpr' Id VarSet]
-> BcM BCInstrList
generateCCall d0 s p (CCallSpec target cconv _) fn args_r_to_l
= let
addr_sizeW :: Word16
addr_sizeW = fromIntegral (cgRepSizeW NonPtrArg)
pargs _ [] = return []
pargs d (a:az)
= let arg_ty = repType (exprType (deAnnotate' a))
in case splitTyConApp_maybe arg_ty of
Just (t, _)
| t == arrayPrimTyCon || t == mutableArrayPrimTyCon
-> do rest <- pargs (d + addr_sizeW) az
code <- parg_ArrayishRep (fromIntegral arrPtrsHdrSize) d p a
return ((code,AddrRep):rest)
| t == byteArrayPrimTyCon || t == mutableByteArrayPrimTyCon
-> do rest <- pargs (d + addr_sizeW) az
code <- parg_ArrayishRep (fromIntegral arrWordsHdrSize) d p a
return ((code,AddrRep):rest)
_
-> do (code_a, sz_a) <- pushAtom d p a
rest <- pargs (d+sz_a) az
return ((code_a, atomPrimRep a) : rest)
parg_ArrayishRep :: Word16 -> Word16 -> BCEnv -> AnnExpr' Id VarSet
-> BcM BCInstrList
parg_ArrayishRep hdrSize d p a
= do (push_fo, _) <- pushAtom d p a
return (push_fo `snocOL` SWIZZLE 0 hdrSize)
in do
code_n_reps <- pargs d0 args_r_to_l
let
(pushs_arg, a_reps_pushed_r_to_l) = unzip code_n_reps
a_reps_sizeW = fromIntegral (sum (map primRepSizeW a_reps_pushed_r_to_l))
push_args = concatOL pushs_arg
d_after_args = d0 + a_reps_sizeW
a_reps_pushed_RAW
| null a_reps_pushed_r_to_l || head a_reps_pushed_r_to_l /= VoidRep
= panic "ByteCodeGen.generateCCall: missing or invalid World token?"
| otherwise
= reverse (tail a_reps_pushed_r_to_l)
(returns_void, r_rep)
= case maybe_getCCallReturnRep (idType fn) of
Nothing -> (True, VoidRep)
Just rr -> (False, rr)
get_target_info
= case target of
DynamicTarget
-> return (False, panic "ByteCodeGen.generateCCall(dyn)")
StaticTarget target _
-> do res <- ioToBc (lookupStaticPtr stdcall_adj_target)
return (True, res)
where
stdcall_adj_target
#ifdef mingw32_TARGET_OS
| StdCallConv <- cconv
= let size = fromIntegral a_reps_sizeW * wORD_SIZE in
mkFastString (unpackFS target ++ '@':show size)
#endif
| otherwise
= target
(is_static, static_target_addr) <- get_target_info
let
a_reps
| is_static = a_reps_pushed_RAW
| otherwise = if null a_reps_pushed_RAW
then panic "ByteCodeGen.generateCCall: dyn with no args"
else tail a_reps_pushed_RAW
(push_Addr, d_after_Addr)
| is_static
= (toOL [PUSH_UBX (Right static_target_addr) addr_sizeW],
d_after_args + addr_sizeW)
| otherwise
= (nilOL, d_after_args)
r_sizeW = fromIntegral (primRepSizeW r_rep)
d_after_r = d_after_Addr + r_sizeW
r_lit = mkDummyLiteral r_rep
push_r = (if returns_void
then nilOL
else unitOL (PUSH_UBX (Left r_lit) r_sizeW))
stk_offset = d_after_r s
token <- ioToBc $ prepForeignCall cconv a_reps r_rep
let addr_of_marshaller = castPtrToFunPtr token
recordItblMallocBc (ItblPtr (castFunPtrToPtr addr_of_marshaller))
let
do_call = unitOL (CCALL stk_offset (castFunPtrToPtr addr_of_marshaller))
wrapup = mkSLIDE r_sizeW (d_after_r r_sizeW s)
`snocOL` RETURN_UBX (primRepToCgRep r_rep)
--in
return (
push_args `appOL`
push_Addr `appOL` push_r `appOL` do_call `appOL` wrapup
)
mkDummyLiteral :: PrimRep -> Literal
mkDummyLiteral pr
= case pr of
IntRep -> MachInt 0
WordRep -> MachWord 0
AddrRep -> MachNullAddr
DoubleRep -> MachDouble 0
FloatRep -> MachFloat 0
Int64Rep -> MachInt64 0
Word64Rep -> MachWord64 0
_ -> panic "mkDummyLiteral"
maybe_getCCallReturnRep :: Type -> Maybe PrimRep
maybe_getCCallReturnRep fn_ty
= let (_a_tys, r_ty) = splitFunTys (dropForAlls fn_ty)
maybe_r_rep_to_go
= if isSingleton r_reps then Nothing else Just (r_reps !! 1)
(r_tycon, r_reps)
= case splitTyConApp_maybe (repType r_ty) of
(Just (tyc, tys)) -> (tyc, map typePrimRep tys)
Nothing -> blargh
ok = ( ( r_reps `lengthIs` 2 && VoidRep == head r_reps)
|| r_reps == [VoidRep] )
&& isUnboxedTupleTyCon r_tycon
&& case maybe_r_rep_to_go of
Nothing -> True
Just r_rep -> r_rep /= PtrRep
blargh :: a
blargh = pprPanic "maybe_getCCallReturn: can't handle:"
(pprType fn_ty)
in
if ok then maybe_r_rep_to_go else blargh
implement_tagToId :: [Name] -> BcM BCInstrList
implement_tagToId names
= ASSERT( notNull names )
do labels <- getLabelsBc (genericLength names)
label_fail <- getLabelBc
label_exit <- getLabelBc
let infos = zip4 labels (tail labels ++ [label_fail])
[0 ..] names
steps = map (mkStep label_exit) infos
return (concatOL steps
`appOL`
toOL [LABEL label_fail, CASEFAIL, LABEL label_exit])
where
mkStep l_exit (my_label, next_label, n, name_for_n)
= toOL [LABEL my_label,
TESTEQ_I n next_label,
PUSH_G name_for_n,
JMP l_exit]
pushAtom :: Word16 -> BCEnv -> AnnExpr' Id VarSet -> BcM (BCInstrList, Word16)
pushAtom d p e
| Just e' <- bcView e
= pushAtom d p e'
pushAtom d p (AnnVar v)
| idCgRep v == VoidArg
= return (nilOL, 0)
| isFCallId v
= pprPanic "pushAtom: shouldn't get an FCallId here" (ppr v)
| Just primop <- isPrimOpId_maybe v
= return (unitOL (PUSH_PRIMOP primop), 1)
| Just d_v <- lookupBCEnv_maybe v p
= let l = d d_v + sz 2
in return (toOL (genericReplicate sz (PUSH_L l)), sz)
| otherwise
= ASSERT(sz == 1)
return (unitOL (PUSH_G (getName v)), sz)
where
sz :: Word16
sz = fromIntegral (idSizeW v)
pushAtom _ _ (AnnLit lit)
= case lit of
MachLabel _ _ _ -> code NonPtrArg
MachWord _ -> code NonPtrArg
MachInt _ -> code PtrArg
MachFloat _ -> code FloatArg
MachDouble _ -> code DoubleArg
MachChar _ -> code NonPtrArg
MachNullAddr -> code NonPtrArg
MachStr s -> pushStr s
l -> pprPanic "pushAtom" (ppr l)
where
code rep
= let size_host_words = fromIntegral (cgRepSizeW rep)
in return (unitOL (PUSH_UBX (Left lit) size_host_words),
size_host_words)
pushStr s
= let getMallocvilleAddr
= case s of
FastString _ n _ fp _ ->
do ptr <- ioToBc (mallocBytes (n+1))
recordMallocBc ptr
ioToBc (
withForeignPtr fp $ \p -> do
memcpy ptr p (fromIntegral n)
pokeByteOff ptr n (fromIntegral (ord '\0') :: Word8)
return ptr
)
in do
addr <- getMallocvilleAddr
return (unitOL (PUSH_UBX (Right addr) 1), 1)
pushAtom d p (AnnCast e _)
= pushAtom d p (snd e)
pushAtom _ _ expr
= pprPanic "ByteCodeGen.pushAtom"
(pprCoreExpr (deAnnotate (undefined, expr)))
foreign import ccall unsafe "memcpy"
memcpy :: Ptr a -> Ptr b -> CSize -> IO ()
mkMultiBranch :: Maybe Int
-> [(Discr, BCInstrList)]
-> BcM BCInstrList
mkMultiBranch maybe_ncons raw_ways
= let d_way = filter (isNoDiscr.fst) raw_ways
notd_ways = sortLe
(\w1 w2 -> leAlt (fst w1) (fst w2))
(filter (not.isNoDiscr.fst) raw_ways)
mkTree :: [(Discr, BCInstrList)] -> Discr -> Discr -> BcM BCInstrList
mkTree [] _range_lo _range_hi = return the_default
mkTree [val] range_lo range_hi
| range_lo `eqAlt` range_hi
= return (snd val)
| otherwise
= do label_neq <- getLabelBc
return (testEQ (fst val) label_neq
`consOL` (snd val
`appOL` unitOL (LABEL label_neq)
`appOL` the_default))
mkTree vals range_lo range_hi
= let n = length vals `div` 2
vals_lo = take n vals
vals_hi = drop n vals
v_mid = fst (head vals_hi)
in do
label_geq <- getLabelBc
code_lo <- mkTree vals_lo range_lo (dec v_mid)
code_hi <- mkTree vals_hi v_mid range_hi
return (testLT v_mid label_geq
`consOL` (code_lo
`appOL` unitOL (LABEL label_geq)
`appOL` code_hi))
the_default
= case d_way of [] -> unitOL CASEFAIL
[(_, def)] -> def
_ -> panic "mkMultiBranch/the_default"
testLT (DiscrI i) fail_label = TESTLT_I i fail_label
testLT (DiscrW i) fail_label = TESTLT_W i fail_label
testLT (DiscrF i) fail_label = TESTLT_F i fail_label
testLT (DiscrD i) fail_label = TESTLT_D i fail_label
testLT (DiscrP i) fail_label = TESTLT_P i fail_label
testLT NoDiscr _ = panic "mkMultiBranch NoDiscr"
testEQ (DiscrI i) fail_label = TESTEQ_I i fail_label
testEQ (DiscrW i) fail_label = TESTEQ_W i fail_label
testEQ (DiscrF i) fail_label = TESTEQ_F i fail_label
testEQ (DiscrD i) fail_label = TESTEQ_D i fail_label
testEQ (DiscrP i) fail_label = TESTEQ_P i fail_label
testEQ NoDiscr _ = panic "mkMultiBranch NoDiscr"
(init_lo, init_hi)
| null notd_ways
= panic "mkMultiBranch: awesome foursome"
| otherwise
= case fst (head notd_ways) of
DiscrI _ -> ( DiscrI minBound, DiscrI maxBound )
DiscrW _ -> ( DiscrW minBound, DiscrW maxBound )
DiscrF _ -> ( DiscrF minF, DiscrF maxF )
DiscrD _ -> ( DiscrD minD, DiscrD maxD )
DiscrP _ -> ( DiscrP algMinBound, DiscrP algMaxBound )
NoDiscr -> panic "mkMultiBranch NoDiscr"
(algMinBound, algMaxBound)
= case maybe_ncons of
Just n -> (0, fromIntegral n 1)
Nothing -> (minBound, maxBound)
(DiscrI i1) `eqAlt` (DiscrI i2) = i1 == i2
(DiscrW w1) `eqAlt` (DiscrW w2) = w1 == w2
(DiscrF f1) `eqAlt` (DiscrF f2) = f1 == f2
(DiscrD d1) `eqAlt` (DiscrD d2) = d1 == d2
(DiscrP i1) `eqAlt` (DiscrP i2) = i1 == i2
NoDiscr `eqAlt` NoDiscr = True
_ `eqAlt` _ = False
(DiscrI i1) `leAlt` (DiscrI i2) = i1 <= i2
(DiscrW w1) `leAlt` (DiscrW w2) = w1 <= w2
(DiscrF f1) `leAlt` (DiscrF f2) = f1 <= f2
(DiscrD d1) `leAlt` (DiscrD d2) = d1 <= d2
(DiscrP i1) `leAlt` (DiscrP i2) = i1 <= i2
NoDiscr `leAlt` NoDiscr = True
_ `leAlt` _ = False
isNoDiscr NoDiscr = True
isNoDiscr _ = False
dec (DiscrI i) = DiscrI (i1)
dec (DiscrW w) = DiscrW (w1)
dec (DiscrP i) = DiscrP (i1)
dec other = other
minF, maxF :: Float
minD, maxD :: Double
minF = 1.0e37
maxF = 1.0e37
minD = 1.0e308
maxD = 1.0e308
in
mkTree notd_ways init_lo init_hi
data Discr
= DiscrI Int
| DiscrW Word
| DiscrF Float
| DiscrD Double
| DiscrP Word16
| NoDiscr
instance Outputable Discr where
ppr (DiscrI i) = int i
ppr (DiscrW w) = text (show w)
ppr (DiscrF f) = text (show f)
ppr (DiscrD d) = text (show d)
ppr (DiscrP i) = ppr i
ppr NoDiscr = text "DEF"
lookupBCEnv_maybe :: Id -> BCEnv -> Maybe Word16
lookupBCEnv_maybe = Map.lookup
idSizeW :: Id -> Int
idSizeW id = cgRepSizeW (typeCgRep (idType id))
unboxedTupleException :: a
unboxedTupleException
= ghcError
(ProgramError
("Error: bytecode compiler can't handle unboxed tuples.\n"++
" Possibly due to foreign import/export decls in source.\n"++
" Workaround: use -fobject-code, or compile this module to .o separately."))
mkSLIDE :: Word16 -> Word16 -> OrdList BCInstr
mkSLIDE n d = if d == 0 then nilOL else unitOL (SLIDE n d)
splitApp :: AnnExpr' Var ann -> (AnnExpr' Var ann, [AnnExpr' Var ann])
splitApp e | Just e' <- bcView e = splitApp e'
splitApp (AnnApp (_,f) (_,a)) = case splitApp f of
(f', as) -> (f', a:as)
splitApp e = (e, [])
bcView :: AnnExpr' Var ann -> Maybe (AnnExpr' Var ann)
bcView (AnnNote _ (_,e)) = Just e
bcView (AnnCast (_,e) _) = Just e
bcView (AnnLam v (_,e)) | isTyCoVar v = Just e
bcView (AnnApp (_,e) (_, AnnType _)) = Just e
bcView _ = Nothing
isVoidArgAtom :: AnnExpr' Var ann -> Bool
isVoidArgAtom e | Just e' <- bcView e = isVoidArgAtom e'
isVoidArgAtom (AnnVar v) = typePrimRep (idType v) == VoidRep
isVoidArgAtom _ = False
atomPrimRep :: AnnExpr' Id ann -> PrimRep
atomPrimRep e | Just e' <- bcView e = atomPrimRep e'
atomPrimRep (AnnVar v) = typePrimRep (idType v)
atomPrimRep (AnnLit l) = typePrimRep (literalType l)
atomPrimRep other = pprPanic "atomPrimRep" (ppr (deAnnotate (undefined,other)))
atomRep :: AnnExpr' Id ann -> CgRep
atomRep e = primRepToCgRep (atomPrimRep e)
isPtrAtom :: AnnExpr' Id ann -> Bool
isPtrAtom e = atomRep e == PtrArg
mkStackOffsets :: Word16 -> [Word16] -> [Word16]
mkStackOffsets original_depth szsw
= map (subtract 1) (tail (scanl (+) original_depth szsw))
type BcPtr = Either ItblPtr (Ptr ())
data BcM_State
= BcM_State {
uniqSupply :: UniqSupply,
nextlabel :: Word16,
malloced :: [BcPtr],
breakArray :: BreakArray
}
newtype BcM r = BcM (BcM_State -> IO (BcM_State, r))
ioToBc :: IO a -> BcM a
ioToBc io = BcM $ \st -> do
x <- io
return (st, x)
runBc :: UniqSupply -> ModBreaks -> BcM r -> IO (BcM_State, r)
runBc us modBreaks (BcM m)
= m (BcM_State us 0 [] breakArray)
where
breakArray = modBreaks_flags modBreaks
thenBc :: BcM a -> (a -> BcM b) -> BcM b
thenBc (BcM expr) cont = BcM $ \st0 -> do
(st1, q) <- expr st0
let BcM k = cont q
(st2, r) <- k st1
return (st2, r)
thenBc_ :: BcM a -> BcM b -> BcM b
thenBc_ (BcM expr) (BcM cont) = BcM $ \st0 -> do
(st1, _) <- expr st0
(st2, r) <- cont st1
return (st2, r)
returnBc :: a -> BcM a
returnBc result = BcM $ \st -> (return (st, result))
instance Monad BcM where
(>>=) = thenBc
(>>) = thenBc_
return = returnBc
emitBc :: ([BcPtr] -> ProtoBCO Name) -> BcM (ProtoBCO Name)
emitBc bco
= BcM $ \st -> return (st{malloced=[]}, bco (malloced st))
recordMallocBc :: Ptr a -> BcM ()
recordMallocBc a
= BcM $ \st -> return (st{malloced = Right (castPtr a) : malloced st}, ())
recordItblMallocBc :: ItblPtr -> BcM ()
recordItblMallocBc a
= BcM $ \st -> return (st{malloced = Left a : malloced st}, ())
getLabelBc :: BcM Word16
getLabelBc
= BcM $ \st -> do let nl = nextlabel st
when (nl == maxBound) $
panic "getLabelBc: Ran out of labels"
return (st{nextlabel = nl + 1}, nl)
getLabelsBc :: Word16 -> BcM [Word16]
getLabelsBc n
= BcM $ \st -> let ctr = nextlabel st
in return (st{nextlabel = ctr+n}, [ctr .. ctr+n1])
getBreakArray :: BcM BreakArray
getBreakArray = BcM $ \st -> return (st, breakArray st)
newUnique :: BcM Unique
newUnique = BcM $
\st -> case splitUniqSupply (uniqSupply st) of
(us1, us2) -> let newState = st { uniqSupply = us2 }
in return (newState, uniqFromSupply us1)
newId :: Type -> BcM Id
newId ty = do
uniq <- newUnique
return $ mkSysLocal tickFS uniq ty
tickFS :: FastString
tickFS = fsLit "ticked"
\end{code}