%
-% (c) The University of Glasgow 2000
+% (c) The University of Glasgow 2002
%
\section[ByteCodeGen]{Generate bytecode from Core}
\begin{code}
-module ByteCodeGen ( UnlinkedBCO, UnlinkedBCOExpr, ItblEnv, ClosureEnv, HValue,
- filterNameMap,
- byteCodeGen, coreExprToBCOs,
- linkIModules, linkIExpr
- ) where
+module ByteCodeGen ( UnlinkedBCO, byteCodeGen, coreExprToBCOs ) where
#include "HsVersions.h"
+import ByteCodeInstr
+import ByteCodeFFI ( mkMarshalCode, moan64 )
+import ByteCodeAsm ( CompiledByteCode(..), UnlinkedBCO,
+ assembleBCO, assembleBCOs, iNTERP_STACK_CHECK_THRESH )
+import ByteCodeLink ( lookupStaticPtr )
+
import Outputable
-import Name ( Name, getName, nameModule, mkSysLocalName, toRdrName )
-import RdrName ( rdrNameOcc, rdrNameModule )
-import OccName ( occNameString )
-import Id ( Id, idType, isDataConId_maybe, mkVanillaId )
-import OrdList ( OrdList, consOL, snocOL, appOL, unitOL,
- nilOL, toOL, concatOL, fromOL )
-import FiniteMap ( FiniteMap, addListToFM, listToFM, filterFM,
- addToFM, lookupFM, fmToList, emptyFM, plusFM )
+import Name ( Name, getName, mkSystemVarName )
+import Id
+import FiniteMap
+import ForeignCall ( ForeignCall(..), CCallTarget(..), CCallSpec(..) )
+import HscTypes ( TypeEnv, typeEnvTyCons, typeEnvClasses )
+import CoreUtils ( exprType )
import CoreSyn
-import PprCore ( pprCoreExpr, pprCoreAlt )
-import Literal ( Literal(..), literalPrimRep )
-import PrimRep ( PrimRep(..) )
+import PprCore ( pprCoreExpr )
+import Literal ( Literal(..), literalType )
+import PrimOp ( PrimOp(..) )
import CoreFVs ( freeVars )
-import Type ( typePrimRep )
+import Type ( isUnLiftedType, splitTyConApp_maybe )
import DataCon ( DataCon, dataConTag, fIRST_TAG, dataConTyCon,
- dataConRepArgTys )
-import TyCon ( TyCon, tyConFamilySize, isDataTyCon, tyConDataCons )
+ isUnboxedTupleCon, isNullaryRepDataCon, dataConWorkId,
+ dataConRepArity )
+import TyCon ( tyConFamilySize, isDataTyCon, tyConDataCons,
+ isUnboxedTupleTyCon )
import Class ( Class, classTyCon )
-import Util ( zipEqual, zipWith4Equal, naturalMergeSortLe, nOfThem, global )
+import Type ( Type, repType, splitFunTys, dropForAlls, pprType )
+import Util
+import DataCon ( dataConRepArity )
import Var ( isTyVar )
import VarSet ( VarSet, varSetElems )
-import PrimRep ( getPrimRepSize, isFollowableRep )
-import Constants ( wORD_SIZE )
+import TysPrim ( arrayPrimTyCon, mutableArrayPrimTyCon,
+ byteArrayPrimTyCon, mutableByteArrayPrimTyCon
+ )
import CmdLineOpts ( DynFlags, DynFlag(..) )
import ErrUtils ( showPass, dumpIfSet_dyn )
-import ClosureInfo ( mkVirtHeapOffsets )
-import Module ( ModuleName, moduleName, moduleNameFS )
-import Unique ( mkPseudoUnique3 )
-import Linker ( lookupSymbol )
-import FastString ( FastString(..) )
-
-
-import List ( intersperse )
-import Monad ( foldM )
-import ST ( runST )
-import MArray ( castSTUArray,
- newFloatArray, writeFloatArray,
- newDoubleArray, writeDoubleArray,
- newIntArray, writeIntArray,
- newAddrArray, writeAddrArray )
-import Foreign ( Storable(..), Word8, Word16, Word32, Ptr(..),
- malloc, castPtr, plusPtr, mallocBytes )
-import Addr ( Word, addrToInt, nullAddr, writeCharOffAddr )
-import Bits ( Bits(..), shiftR )
-import CTypes ( CInt )
-
-import PrelBase ( Int(..) )
-import PrelAddr ( Addr(..) )
-import PrelGHC ( BCO#, newBCO#, unsafeCoerce#,
- ByteArray#, Array#, addrToHValue# )
-import IOExts ( IORef, fixIO, unsafePerformIO )
-import ArrayBase
-import PrelArr ( Array(..) )
-import PrelIOBase ( IO(..) )
+import Unique ( mkPseudoUniqueE )
+import FastString ( FastString(..), unpackFS )
+import Panic ( GhcException(..) )
+import SMRep ( typeCgRep, arrWordsHdrSize, arrPtrsHdrSize, StgWord,
+ CgRep(..), cgRepSizeW, isFollowableArg, idCgRep )
+import Bitmap ( intsToReverseBitmap, mkBitmap )
+import OrdList
+import Constants ( wORD_SIZE )
-\end{code}
+import Data.List ( intersperse, sortBy, zip4, zip5, partition )
+import Foreign ( Ptr, castPtr, mallocBytes, pokeByteOff, Word8 )
+import Foreign.C ( CInt )
+import Control.Exception ( throwDyn )
-%************************************************************************
-%* *
-\subsection{Functions visible from outside this module.}
-%* *
-%************************************************************************
+import GHC.Exts ( Int(..), ByteArray# )
-\begin{code}
+import Control.Monad ( when )
+import Data.Char ( ord, chr )
+
+-- -----------------------------------------------------------------------------
+-- Generating byte code for a complete module
byteCodeGen :: DynFlags
- -> [CoreBind]
- -> [TyCon] -> [Class]
- -> IO ([UnlinkedBCO], ItblEnv)
-byteCodeGen dflags binds local_tycons local_classes
+ -> [CoreBind]
+ -> TypeEnv
+ -> IO CompiledByteCode
+byteCodeGen dflags binds type_env
= do showPass dflags "ByteCodeGen"
- let tycs = local_tycons ++ map classTyCon local_classes
- itblenv <- mkITbls tycs
+ let local_tycons = typeEnvTyCons type_env
+ local_classes = typeEnvClasses type_env
+ tycs = local_tycons ++ map classTyCon local_classes
- let flatBinds = concatMap getBind binds
- getBind (NonRec bndr rhs) = [(bndr, freeVars rhs)]
- getBind (Rec binds) = [(bndr, freeVars rhs) | (bndr,rhs) <- binds]
- final_state = runBc (BcM_State [] 0)
- (mapBc schemeR flatBinds `thenBc_` returnBc ())
- (BcM_State proto_bcos final_ctr) = final_state
+ let flatBinds = [ (bndr, freeVars rhs)
+ | (bndr, rhs) <- flattenBinds binds]
- dumpIfSet_dyn dflags Opt_D_dump_BCOs
- "Proto-bcos" (vcat (intersperse (char ' ') (map ppr proto_bcos)))
+ (BcM_State final_ctr mallocd, proto_bcos)
+ <- runBc (mapM schemeTopBind flatBinds)
+
+ when (notNull mallocd)
+ (panic "ByteCodeGen.byteCodeGen: missing final emitBc?")
- bcos <- mapM assembleBCO proto_bcos
+ dumpIfSet_dyn dflags Opt_D_dump_BCOs
+ "Proto-BCOs" (vcat (intersperse (char ' ') (map ppr proto_bcos)))
- return (bcos, itblenv)
+ assembleBCOs proto_bcos tycs
+-- -----------------------------------------------------------------------------
+-- Generating byte code for an expression
-- Returns: (the root BCO for this expression,
-- a list of auxilary BCOs resulting from compiling closures)
coreExprToBCOs :: DynFlags
-> CoreExpr
- -> IO UnlinkedBCOExpr
+ -> IO UnlinkedBCO
coreExprToBCOs dflags expr
= do showPass dflags "ByteCodeGen"
-- create a totally bogus name for the top-level BCO; this
-- should be harmless, since it's never used for anything
- let invented_name = mkSysLocalName (mkPseudoUnique3 0) SLIT("Expr-Top-Level")
- let invented_id = mkVanillaId invented_name (panic "invented_id's type")
-
- let (BcM_State all_proto_bcos final_ctr)
- = runBc (BcM_State [] 0)
- (schemeR (invented_id, freeVars expr))
- dumpIfSet_dyn dflags Opt_D_dump_BCOs
- "Proto-bcos" (vcat (intersperse (char ' ') (map ppr all_proto_bcos)))
-
- let root_proto_bco
- = case filter ((== invented_name).nameOfProtoBCO) all_proto_bcos of
- [root_bco] -> root_bco
- auxiliary_proto_bcos
- = filter ((/= invented_name).nameOfProtoBCO) all_proto_bcos
-
- auxiliary_bcos <- mapM assembleBCO auxiliary_proto_bcos
- root_bco <- assembleBCO root_proto_bco
-
- return (root_bco, auxiliary_bcos)
-
-
--- Linking stuff
-linkIModules :: ItblEnv -- incoming global itbl env; returned updated
- -> ClosureEnv -- incoming global closure env; returned updated
- -> [([UnlinkedBCO], ItblEnv)]
- -> IO ([HValue], ItblEnv, ClosureEnv)
-linkIModules gie gce mods
- = do let (bcoss, ies) = unzip mods
- bcos = concat bcoss
- final_gie = foldr plusFM gie ies
- (final_gce, linked_bcos) <- linkSomeBCOs final_gie gce bcos
- return (linked_bcos, final_gie, final_gce)
-
-
-linkIExpr :: ItblEnv -> ClosureEnv -> UnlinkedBCOExpr
- -> IO HValue -- IO BCO# really
-linkIExpr ie ce (root_ul_bco, aux_ul_bcos)
- = do (aux_ce, _) <- linkSomeBCOs ie ce aux_ul_bcos
- (_, [root_bco]) <- linkSomeBCOs ie aux_ce [root_ul_bco]
- return root_bco
-
--- Link a bunch of BCOs and return them + updated closure env.
-linkSomeBCOs :: ItblEnv -> ClosureEnv -> [UnlinkedBCO]
- -> IO (ClosureEnv, [HValue])
-linkSomeBCOs ie ce_in ul_bcos
- = do let nms = map nameOfUnlinkedBCO ul_bcos
- hvals <- fixIO
- ( \ hvs -> let ce_out = addListToFM ce_in (zipLazily nms hvs)
- in mapM (linkBCO ie ce_out) ul_bcos )
- let ce_out = addListToFM ce_in (zip nms hvals)
- return (ce_out, hvals)
- where
- -- A lazier zip, in which no demand is propagated to the second
- -- list unless some demand is propagated to the snd of one of the
- -- result list elems.
- zipLazily [] ys = []
- zipLazily (x:xs) ys = (x, head ys) : zipLazily xs (tail ys)
-
-
-data UnlinkedBCO
- = UnlinkedBCO Name
- (SizedSeq Word16) -- insns
- (SizedSeq Word) -- literals
- (SizedSeq Name) -- ptrs
- (SizedSeq Name) -- itbl refs
-
-nameOfUnlinkedBCO (UnlinkedBCO nm _ _ _ _) = nm
-
--- When translating expressions, we need to distinguish the root
--- BCO for the expression
-type UnlinkedBCOExpr = (UnlinkedBCO, [UnlinkedBCO])
-
-instance Outputable UnlinkedBCO where
- ppr (UnlinkedBCO nm insns lits ptrs itbls)
- = sep [text "BCO", ppr nm, text "with",
- int (sizeSS insns), text "insns",
- int (sizeSS lits), text "lits",
- int (sizeSS ptrs), text "ptrs",
- int (sizeSS itbls), text "itbls"]
-
-
--- these need a proper home
-type ItblEnv = FiniteMap Name (Ptr StgInfoTable)
-type ClosureEnv = FiniteMap Name HValue
-data HValue = HValue -- dummy type, actually a pointer to some Real Code.
-
--- remove all entries for a given set of modules from the environment
-filterNameMap :: [ModuleName] -> FiniteMap Name a -> FiniteMap Name a
-filterNameMap mods env
- = filterFM (\n _ -> moduleName (nameModule n) `notElem` mods) env
-\end{code}
+ let invented_name = mkSystemVarName (mkPseudoUniqueE 0) FSLIT("ExprTopLevel")
+ invented_id = mkLocalId invented_name (panic "invented_id's type")
+
+ (BcM_State final_ctr mallocd, proto_bco)
+ <- runBc (schemeTopBind (invented_id, freeVars expr))
-%************************************************************************
-%* *
-\subsection{Bytecodes, and Outputery.}
-%* *
-%************************************************************************
+ when (notNull mallocd)
+ (panic "ByteCodeGen.coreExprToBCOs: missing final emitBc?")
-\begin{code}
+ dumpIfSet_dyn dflags Opt_D_dump_BCOs "Proto-BCOs" (ppr proto_bco)
-type LocalLabel = Int
-
-data BCInstr
- -- Messing with the stack
- = ARGCHECK Int
- -- Push locals (existing bits of the stack)
- | PUSH_L Int{-offset-}
- | PUSH_LL Int Int{-2 offsets-}
- | PUSH_LLL Int Int Int{-3 offsets-}
- -- Push a ptr
- | PUSH_G Name
- -- Push an alt continuation
- | PUSH_AS Name PrimRep -- push alts and BCO_ptr_ret_info
- -- PrimRep so we know which itbl
- -- Pushing literals
- | PUSH_UBX Literal Int
- -- push this int/float/double, NO TAG, on the stack
- -- Int is # of words to copy from literal pool
- | PUSH_TAG Int -- push this tag on the stack
-
- | SLIDE Int{-this many-} Int{-down by this much-}
- -- To do with the heap
- | ALLOC Int -- make an AP_UPD with this many payload words, zeroed
- | MKAP Int{-ptr to AP_UPD is this far down stack-} Int{-# words-}
- | UNPACK Int -- unpack N ptr words from t.o.s Constr
- | UPK_TAG Int Int Int
- -- unpack N non-ptr words from offset M in constructor
- -- K words down the stack
- | PACK DataCon Int
- -- after assembly, the DataCon is an index into the
- -- itbl array
- -- For doing case trees
- | LABEL LocalLabel
- | TESTLT_I Int LocalLabel
- | TESTEQ_I Int LocalLabel
- | TESTLT_F Float LocalLabel
- | TESTEQ_F Float LocalLabel
- | TESTLT_D Double LocalLabel
- | TESTEQ_D Double LocalLabel
-
- -- The Int value is a constructor number and therefore
- -- stored in the insn stream rather than as an offset into
- -- the literal pool.
- | TESTLT_P Int LocalLabel
- | TESTEQ_P Int LocalLabel
-
- | CASEFAIL
- -- To Infinity And Beyond
- | ENTER
- | RETURN PrimRep
- -- unboxed value on TOS. Use tag to find underlying ret itbl
- -- and return as per that.
-
-
-instance Outputable BCInstr where
- ppr (ARGCHECK n) = text "ARGCHECK" <+> int n
- ppr (PUSH_L offset) = text "PUSH_L " <+> int offset
- ppr (PUSH_LL o1 o2) = text "PUSH_LL " <+> int o1 <+> int o2
- ppr (PUSH_LLL o1 o2 o3) = text "PUSH_LLL" <+> int o1 <+> int o2 <+> int o3
- ppr (PUSH_G nm) = text "PUSH_G " <+> ppr nm
- ppr (PUSH_AS nm pk) = text "PUSH_AS " <+> ppr nm <+> ppr pk
- ppr (PUSH_UBX lit nw) = text "PUSH_UBX" <+> parens (int nw) <+> ppr lit
- ppr (PUSH_TAG n) = text "PUSH_TAG" <+> int n
- ppr (SLIDE n d) = text "SLIDE " <+> int n <+> int d
- ppr (ALLOC sz) = text "ALLOC " <+> int sz
- ppr (MKAP offset sz) = text "MKAP " <+> int sz <+> text "words,"
- <+> int offset <+> text "stkoff"
- ppr (UNPACK sz) = text "UNPACK " <+> int sz
- ppr (UPK_TAG n m k) = text "UPK_TAG " <+> int n <> text "words"
- <+> int m <> text "conoff"
- <+> int k <> text "stkoff"
- ppr (PACK dcon sz) = text "PACK " <+> ppr dcon <+> ppr sz
- ppr (LABEL lab) = text "__" <> int lab <> colon
- ppr (TESTLT_I i lab) = text "TESTLT_I" <+> int i <+> text "__" <> int lab
- ppr (TESTEQ_I i lab) = text "TESTEQ_I" <+> int i <+> text "__" <> int lab
- ppr (TESTLT_F f lab) = text "TESTLT_F" <+> float f <+> text "__" <> int lab
- ppr (TESTEQ_F f lab) = text "TESTEQ_F" <+> float f <+> text "__" <> int lab
- ppr (TESTLT_D d lab) = text "TESTLT_D" <+> double d <+> text "__" <> int lab
- ppr (TESTEQ_D d lab) = text "TESTEQ_D" <+> double d <+> text "__" <> int lab
- ppr (TESTLT_P i lab) = text "TESTLT_P" <+> int i <+> text "__" <> int lab
- ppr (TESTEQ_P i lab) = text "TESTEQ_P" <+> int i <+> text "__" <> int lab
- ppr CASEFAIL = text "CASEFAIL"
- ppr ENTER = text "ENTER"
- ppr (RETURN pk) = text "RETURN " <+> ppr pk
-
-instance Outputable a => Outputable (ProtoBCO a) where
- ppr (ProtoBCO name instrs origin)
- = (text "ProtoBCO" <+> ppr name <> colon)
- $$ nest 6 (vcat (map ppr instrs))
- $$ case origin of
- Left alts -> vcat (map (pprCoreAlt.deAnnAlt) alts)
- Right rhs -> pprCoreExpr (deAnnotate rhs)
-\end{code}
+ assembleBCO proto_bco
-%************************************************************************
-%* *
-\subsection{Compilation schema for the bytecode generator.}
-%* *
-%************************************************************************
-\begin{code}
+-- -----------------------------------------------------------------------------
+-- Compilation schema for the bytecode generator
type BCInstrList = OrdList BCInstr
-data ProtoBCO a
- = ProtoBCO a -- name, in some sense
- [BCInstr] -- instrs
- -- what the BCO came from
- (Either [AnnAlt Id VarSet]
- (AnnExpr Id VarSet))
-
-nameOfProtoBCO (ProtoBCO nm insns origin) = nm
-
-
type Sequel = Int -- back off to this depth before ENTER
-- Maps Ids to the offset from the stack _base_ so we don't have
-- to mess with it after each push/pop.
type BCEnv = FiniteMap Id Int -- To find vars on the stack
+ppBCEnv :: BCEnv -> SDoc
+ppBCEnv p
+ = text "begin-env"
+ $$ nest 4 (vcat (map pp_one (sortBy cmp_snd (fmToList p))))
+ $$ text "end-env"
+ where
+ pp_one (var, offset) = int offset <> colon <+> ppr var <+> ppr (idCgRep var)
+ cmp_snd x y = compare (snd x) (snd y)
-- Create a BCO and do a spot of peephole optimisation on the insns
-- at the same time.
-mkProtoBCO nm instrs_ordlist origin
- = ProtoBCO nm (id {-peep-} (fromOL instrs_ordlist)) origin
+mkProtoBCO
+ :: name
+ -> BCInstrList
+ -> Either [AnnAlt Id VarSet] (AnnExpr Id VarSet)
+ -> Int
+ -> Int
+ -> [StgWord]
+ -> Bool -- True <=> is a return point, rather than a function
+ -> [Ptr ()]
+ -> 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
+ -- Overestimate the stack usage (in words) of this BCO,
+ -- and if >= iNTERP_STACK_CHECK_THRESH, add an explicit
+ -- stack check. (The interpreter always does a stack check
+ -- for iNTERP_STACK_CHECK_THRESH words at the start of each
+ -- BCO anyway, so we only need to add an explicit on in the
+ -- (hopefully rare) cases when the (overestimated) stack use
+ -- exceeds iNTERP_STACK_CHECK_THRESH.
+ maybe_with_stack_check
+ | is_ret = peep_d
+ -- don't do stack checks at return points;
+ -- everything is aggregated up to the top BCO
+ -- (which must be a function)
+ | stack_overest >= 65535
+ = pprPanic "mkProtoBCO: stack use won't fit in 16 bits"
+ (int stack_overest)
+ | stack_overest >= iNTERP_STACK_CHECK_THRESH
+ = STKCHECK stack_overest : peep_d
+ | otherwise
+ = peep_d -- the supposedly common case
+
+ stack_overest = sum (map bciStackUse peep_d)
+
+ -- Merge local pushes
+ peep_d = peep (fromOL instrs_ordlist)
+
peep (PUSH_L off1 : PUSH_L off2 : PUSH_L off3 : rest)
= PUSH_LLL off1 (off2-1) (off3-2) : peep rest
peep (PUSH_L off1 : PUSH_L off2 : rest)
- = PUSH_LL off1 off2 : peep rest
+ = PUSH_LL off1 (off2-1) : 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
+
+-- Compile code for the right-hand side of a top-level binding
--- Compile code for the right hand side of a let binding.
+schemeTopBind :: (Id, AnnExpr Id VarSet) -> BcM (ProtoBCO Name)
+
+
+schemeTopBind (id, rhs)
+ | Just data_con <- isDataConWorkId_maybe id,
+ isNullaryRepDataCon data_con
+ = -- Special case for the worker of a nullary data con.
+ -- It'll look like this: Nil = /\a -> Nil a
+ -- If we feed it into schemeR, we'll get
+ -- Nil = Nil
+ -- because mkConAppCode treats nullary constructor applications
+ -- by just re-using the single top-level definition. So
+ -- for the worker itself, we must allocate it directly.
+ emitBc (mkProtoBCO (getName id) (toOL [PACK data_con 0, ENTER])
+ (Right rhs) 0 0 [{-no bitmap-}] False{-not alts-})
+
+ | otherwise
+ = schemeR [{- No free variables -}] (id, rhs)
+
+-- -----------------------------------------------------------------------------
+-- schemeR
+
+-- Compile code for a right-hand side, to give a BCO that,
+-- when executed with the free variables and arguments on top of the stack,
+-- will return with a pointer to the result on top of the stack, after
+-- removing the free variables and arguments.
+--
-- Park the resulting BCO in the monad. Also requires the
-- variable to which this value was bound, so as to give the
--- resulting BCO a name.
-schemeR :: (Id, AnnExpr Id VarSet) -> BcM ()
-schemeR (nm, rhs)
+-- resulting BCO a name.
+
+schemeR :: [Id] -- Free vars of the RHS, ordered as they
+ -- will appear in the thunk. Empty for
+ -- top-level things, which have no free vars.
+ -> (Id, AnnExpr Id VarSet)
+ -> BcM (ProtoBCO Name)
+schemeR fvs (nm, rhs)
{-
| trace (showSDoc (
(char ' '
$$ char ' '
))) False
= undefined
--}
| otherwise
- = schemeR_wrk rhs nm (collect [] rhs)
+-}
+ = schemeR_wrk fvs nm rhs (collect [] rhs)
+collect xs (_, AnnNote note e) = collect xs e
+collect xs (_, AnnLam x e) = collect (if isTyVar x then xs else (x:xs)) e
+collect xs (_, not_lambda) = (reverse xs, not_lambda)
-collect xs (_, AnnLam x e)
- = collect (if isTyVar x then xs else (x:xs)) e
-collect xs not_lambda
- = (reverse xs, not_lambda)
+schemeR_wrk fvs nm original_body (args, body)
+ = let
+ all_args = reverse args ++ fvs
+ arity = length all_args
+ -- all_args are the args in reverse order. We're compiling a function
+ -- \fv1..fvn x1..xn -> e
+ -- i.e. the fvs come first
-schemeR_wrk original_body nm (args, body)
- = let fvs = filter (not.isTyVar) (varSetElems (fst original_body))
- all_args = fvs ++ reverse args
- szsw_args = map taggedIdSizeW all_args
+ szsw_args = map idSizeW all_args
szw_args = sum szsw_args
p_init = listToFM (zip all_args (mkStackOffsets 0 szsw_args))
- argcheck = {-if null args then nilOL else-} unitOL (ARGCHECK szw_args)
+
+ -- make the arg bitmap
+ bits = argBits (reverse (map idCgRep all_args))
+ bitmap_size = length bits
+ bitmap = mkBitmap bits
in
schemeE szw_args 0 p_init body `thenBc` \ body_code ->
- emitBc (mkProtoBCO (getName nm) (appOL argcheck body_code) (Right original_body))
+ emitBc (mkProtoBCO (getName nm) body_code (Right original_body)
+ arity bitmap_size bitmap False{-not alts-})
--- Let szsw be the sizes in words of some items pushed onto the stack,
--- which has initial depth d'. Return the values which the stack environment
--- should map these items to.
-mkStackOffsets :: Int -> [Int] -> [Int]
-mkStackOffsets original_depth szsw
- = map (subtract 1) (tail (scanl (+) original_depth szsw))
+
+fvsToEnv :: BCEnv -> VarSet -> [Id]
+-- Takes the free variables of a right-hand side, and
+-- delivers an ordered list of the local variables that will
+-- be captured in the thunk for the RHS
+-- The BCEnv argument tells which variables are in the local
+-- environment: these are the ones that should be captured
+--
+-- The code that constructs the thunk, and the code that executes
+-- it, have to agree about this layout
+fvsToEnv p fvs = [v | v <- varSetElems fvs,
+ isId v, -- Could be a type variable
+ v `elemFM` p]
+
+-- -----------------------------------------------------------------------------
+-- schemeE
-- Compile code to apply the given expression to the remaining args
-- on the stack, returning a HNF.
-schemeE :: Int -> Sequel -> BCEnv -> AnnExpr Id VarSet -> BcM BCInstrList
+schemeE :: Int -> Sequel -> BCEnv -> AnnExpr' Id VarSet -> BcM BCInstrList
-- Delegate tail-calls to schemeT.
-schemeE d s p e@(fvs, AnnApp f a)
- = returnBc (schemeT (should_args_be_tagged e) d s 0 p (fvs, AnnApp f a))
-schemeE d s p e@(fvs, AnnVar v)
- | isFollowableRep v_rep
- = returnBc (schemeT (should_args_be_tagged e) d s 0 p (fvs, AnnVar v))
+schemeE d s p e@(AnnApp f a)
+ = schemeT d s p e
+
+schemeE d s p e@(AnnVar v)
+ | not (isUnLiftedType v_type)
+ = -- Lifted-type thing; push it in the normal way
+ schemeT d s p e
+
| otherwise
- = -- returning an unboxed value. Heave it on the stack, SLIDE, and RETURN.
- let (push, szw) = pushAtom True d p (AnnVar v)
- in returnBc (push -- value onto stack
- `snocOL` SLIDE szw (d-s) -- clear to sequel
- `snocOL` RETURN v_rep) -- go
+ = -- Returning an unlifted value.
+ -- Heave it on the stack, SLIDE, and RETURN.
+ pushAtom d p (AnnVar v) `thenBc` \ (push, szw) ->
+ returnBc (push -- value onto stack
+ `appOL` mkSLIDE szw (d-s) -- clear to sequel
+ `snocOL` RETURN_UBX v_rep) -- go
where
- v_rep = typePrimRep (idType v)
+ v_type = idType v
+ v_rep = typeCgRep v_type
-schemeE d s p (fvs, AnnLit literal)
- = let (push, szw) = pushAtom True d p (AnnLit literal)
- l_rep = literalPrimRep literal
+schemeE d s p (AnnLit literal)
+ = pushAtom d p (AnnLit literal) `thenBc` \ (push, szw) ->
+ let l_rep = typeCgRep (literalType literal)
in returnBc (push -- value onto stack
- `snocOL` SLIDE szw (d-s) -- clear to sequel
- `snocOL` RETURN l_rep) -- go
-
-schemeE d s p (fvs, AnnLet binds b)
+ `appOL` mkSLIDE szw (d-s) -- clear to sequel
+ `snocOL` RETURN_UBX l_rep) -- go
+
+
+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
+ = -- Special case for a non-recursive let whose RHS is a
+ -- saturatred constructor application.
+ -- Just allocate the constructor and carry on
+ mkConAppCode d s p data_con args_r_to_l `thenBc` \ alloc_code ->
+ schemeE (d+1) s (addToFM p x d) body `thenBc` \ body_code ->
+ returnBc (alloc_code `appOL` body_code)
+
+-- General case for let. Generates correct, if inefficient, code in
+-- all situations.
+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 = length xs
- fvss = map (filter (not.isTyVar).varSetElems.fst) rhss
+ n_binds = length xs
+
+ fvss = map (fvsToEnv p' . fst) rhss
- -- Sizes of tagged free vars, + 1 for the fn
- sizes = map (\rhs_fvs -> 1 + sum (map taggedIdSizeW rhs_fvs)) fvss
+ -- Sizes of free vars
+ sizes = map (\rhs_fvs -> sum (map idSizeW rhs_fvs)) fvss
+
+ -- the arity of each rhs
+ arities = map (length . fst . collect []) rhss
-- This p', d' defn is safe because all the items being pushed
-- are ptrs, so all have size 1. d' and p' reflect the stack
-- after the closures have been allocated in the heap (but not
-- filled in), and pointers to them parked on the stack.
- p' = addListToFM p (zipE xs (mkStackOffsets d (nOfThem n 1)))
- d' = d + n
-
- infos = zipE4 fvss sizes xs [n, n-1 .. 1]
+ p' = addListToFM p (zipE xs (mkStackOffsets d (nOfThem n_binds 1)))
+ d' = d + n_binds
zipE = zipEqual "schemeE"
- zipE4 = zipWith4Equal "schemeE" (\a b c d -> (a,b,c,d))
-- ToDo: don't build thunks for things with no free variables
- buildThunk dd ([], size, id, off)
- = PUSH_G (getName id)
- `consOL` unitOL (MKAP (off+size-1) size)
- buildThunk dd ((fv:fvs), size, id, off)
- = case pushAtom True dd p' (AnnVar fv) of
- (push_code, pushed_szw)
- -> push_code `appOL`
- buildThunk (dd+pushed_szw) (fvs, size, id, off)
-
- thunkCode = concatOL (map (buildThunk d') infos)
- allocCode = toOL (map ALLOC sizes)
- in
- schemeE d' s p' b `thenBc` \ bodyCode ->
- mapBc schemeR (zip xs rhss) `thenBc_`
- returnBc (allocCode `appOL` thunkCode `appOL` bodyCode)
+ build_thunk dd [] size bco off
+ = returnBc (PUSH_BCO bco
+ `consOL` unitOL (MKAP (off+size) size))
+ build_thunk dd (fv:fvs) size bco off = do
+ (push_code, pushed_szw) <- pushAtom dd p' (AnnVar fv)
+ more_push_code <- build_thunk (dd+pushed_szw) fvs size bco off
+ returnBc (push_code `appOL` more_push_code)
+
+ alloc_code = toOL (zipWith mkAlloc sizes arities)
+ where mkAlloc sz 0 = ALLOC_AP sz
+ mkAlloc sz arity = ALLOC_PAP arity sz
+
+ compile_bind d' fvs x rhs size off = do
+ bco <- schemeR fvs (x,rhs)
+ build_thunk d' fvs size bco off
+
+ compile_binds =
+ [ compile_bind d' fvs x rhs size n
+ | (fvs, x, rhs, size, n) <-
+ zip5 fvss xs rhss sizes [n_binds, n_binds-1 .. 1]
+ ]
+ in do
+ body_code <- schemeE d' s p' body
+ thunk_codes <- sequence compile_binds
+ returnBc (alloc_code `appOL` concatOL thunk_codes `appOL` body_code)
+
+
+
+schemeE d s p (AnnCase scrut bndr _ [(DataAlt dc, [bind1, bind2], rhs)])
+ | isUnboxedTupleCon dc, VoidArg <- typeCgRep (idType bind1)
+ -- Convert
+ -- case .... of x { (# VoidArg'd-thing, a #) -> ... }
+ -- to
+ -- case .... of a { DEFAULT -> ... }
+ -- becuse the return convention for both are identical.
+ --
+ -- Note that it does not matter losing the void-rep thing from the
+ -- envt (it won't be bound now) because we never look such things up.
+
+ = --trace "automagic mashing of case alts (# VoidArg, a #)" $
+ doCase d s p scrut bind2 [(DEFAULT, [], rhs)] True{-unboxed tuple-}
+
+ | isUnboxedTupleCon dc, VoidArg <- typeCgRep (idType bind2)
+ = --trace "automagic mashing of case alts (# a, VoidArg #)" $
+ doCase d s p scrut bind1 [(DEFAULT, [], rhs)] True{-unboxed tuple-}
+
+schemeE d s p (AnnCase scrut bndr _ [(DataAlt dc, [bind1], rhs)])
+ | isUnboxedTupleCon dc
+ -- Similarly, convert
+ -- case .... of x { (# a #) -> ... }
+ -- to
+ -- case .... of a { DEFAULT -> ... }
+ = --trace "automagic mashing of case alts (# a #)" $
+ doCase d s p scrut bind1 [(DEFAULT, [], rhs)] True{-unboxed tuple-}
+
+schemeE d s p (AnnCase scrut bndr _ alts)
+ = doCase d s p scrut bndr alts False{-not an unboxed tuple-}
+
+schemeE d s p (AnnNote note (_, body))
+ = schemeE d s p body
+
+schemeE d s p other
+ = pprPanic "ByteCodeGen.schemeE: unhandled case"
+ (pprCoreExpr (deAnnotate' other))
-schemeE d s p (fvs, AnnCase scrut bndr alts)
- = let
+-- Compile code to do a tail call. Specifically, push the fn,
+-- slide the on-stack app back down to the sequel depth,
+-- and enter. Four cases:
+--
+-- 0. (Nasty hack).
+-- An application "GHC.Prim.tagToEnum# <type> unboxed-int".
+-- The int will be on the stack. Generate a code sequence
+-- to convert it to the relevant constructor, SLIDE and ENTER.
+--
+-- 1. The fn denotes a ccall. Defer to generateCCall.
+--
+-- 2. (Another nasty hack). Spot (# a::VoidArg, b #) and treat
+-- it simply as b -- since the representations are identical
+-- (the VoidArg takes up zero stack space). Also, spot
+-- (# b #) and treat it as b.
+--
+-- 3. Application of a constructor, by defn saturated.
+-- Split the args into ptrs and non-ptrs, and push the nonptrs,
+-- then the ptrs, and then do PACK and RETURN.
+--
+-- 4. Otherwise, it must be a function call. Push the args
+-- right to left, SLIDE and ENTER.
+
+schemeT :: Int -- Stack depth
+ -> Sequel -- Sequel depth
+ -> BCEnv -- stack env
+ -> AnnExpr' Id VarSet
+ -> BcM BCInstrList
+
+schemeT d s p app
+
+-- | trace ("schemeT: env in = \n" ++ showSDocDebug (ppBCEnv p)) False
+-- = panic "schemeT ?!?!"
+
+-- | trace ("\nschemeT\n" ++ showSDoc (pprCoreExpr (deAnnotate' app)) ++ "\n") False
+-- = error "?!?!"
+
+ -- Case 0
+ | Just (arg, constr_names) <- maybe_is_tagToEnum_call
+ = pushAtom d p arg `thenBc` \ (push, arg_words) ->
+ implement_tagToId constr_names `thenBc` \ tagToId_sequence ->
+ returnBc (push `appOL` tagToId_sequence
+ `appOL` mkSLIDE 1 (d+arg_words-s)
+ `snocOL` ENTER)
+
+ -- Case 1
+ | Just (CCall ccall_spec) <- isFCallId_maybe fn
+ = generateCCall d s p ccall_spec fn args_r_to_l
+
+ -- Case 2: Constructor application
+ | 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
+
+ -- Case 3: Ordinary data constructor
+ | Just con <- maybe_saturated_dcon
+ = mkConAppCode d s p con args_r_to_l `thenBc` \ alloc_con ->
+ returnBc (alloc_con `appOL`
+ mkSLIDE 1 (d - s) `snocOL`
+ ENTER)
+
+ -- Case 4: Tail call of function
+ | otherwise
+ = doTailCall d s p fn args_r_to_l
+
+ where
+ -- Detect and extract relevant info for the tagToEnum kludge.
+ maybe_is_tagToEnum_call
+ = let extract_constr_Names ty
+ | Just (tyc, []) <- splitTyConApp_maybe (repType ty),
+ isDataTyCon tyc
+ = map (getName . dataConWorkId) (tyConDataCons tyc)
+ -- NOTE: use the worker name, not the source name of
+ -- the DataCon. See DataCon.lhs for details.
+ | otherwise
+ = panic "maybe_is_tagToEnum_call.extract_constr_Ids"
+ 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)
+ other -> Nothing
+ other -> Nothing
+
+ -- Extract the args (R->L) and fn
+ -- The function will necessarily be a variable,
+ -- because we are compiling a tail call
+ (AnnVar fn, args_r_to_l) = splitApp app
+
+ -- Only consider this to be a constructor application iff it is
+ -- saturated. Otherwise, we'll call the constructor wrapper.
+ n_args = length args_r_to_l
+ maybe_saturated_dcon
+ = case isDataConWorkId_maybe fn of
+ Just con | dataConRepArity con == n_args -> Just con
+ _ -> Nothing
+
+-- -----------------------------------------------------------------------------
+-- Generate code to build a constructor application,
+-- leaving it on top of the stack
+
+mkConAppCode :: Int -> Sequel -> BCEnv
+ -> DataCon -- The data constructor
+ -> [AnnExpr' Id VarSet] -- Args, in *reverse* order
+ -> BcM BCInstrList
+
+mkConAppCode orig_d s p con [] -- Nullary constructor
+ = ASSERT( isNullaryRepDataCon con )
+ returnBc (unitOL (PUSH_G (getName (dataConWorkId con))))
+ -- Instead of doing a PACK, which would allocate a fresh
+ -- copy of this constructor, use the single shared version.
+
+mkConAppCode orig_d s p con args_r_to_l
+ = ASSERT( dataConRepArity con == length args_r_to_l )
+ do_pushery orig_d (non_ptr_args ++ ptr_args)
+ where
+ -- The args are already in reverse order, which is the way PACK
+ -- expects them to be. We must push the non-ptrs after the ptrs.
+ (ptr_args, non_ptr_args) = partition isPtrAtom args_r_to_l
+
+ do_pushery d (arg:args)
+ = pushAtom d p arg `thenBc` \ (push, arg_words) ->
+ do_pushery (d+arg_words) args `thenBc` \ more_push_code ->
+ returnBc (push `appOL` more_push_code)
+ do_pushery d []
+ = returnBc (unitOL (PACK con n_arg_words))
+ where
+ n_arg_words = d - orig_d
+
+
+-- -----------------------------------------------------------------------------
+-- Returning an unboxed tuple with one non-void component (the only
+-- case we can handle).
+--
+-- Remember, we don't want to *evaluate* the component that is being
+-- returned, even if it is a pointed type. We always just return.
+
+unboxedTupleReturn
+ :: Int -> Sequel -> BCEnv
+ -> AnnExpr' Id VarSet -> BcM BCInstrList
+unboxedTupleReturn d s p arg = do
+ (push, sz) <- pushAtom d p arg
+ returnBc (push `appOL`
+ mkSLIDE sz (d-s) `snocOL`
+ RETURN_UBX (atomRep arg))
+
+-- -----------------------------------------------------------------------------
+-- Generate code for a tail-call
+
+doTailCall
+ :: Int -> 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 ()
+ returnBc (push_fn `appOL` (
+ mkSLIDE ((d-init_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
+ -- ^^^ for the PUSH_APPLY_ instruction
+ returnBc (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)
+
+-- v. similar to CgStackery.findMatch, ToDo: merge
+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"
+
+-- -----------------------------------------------------------------------------
+-- Case expressions
+
+doCase :: Int -> Sequel -> BCEnv
+ -> AnnExpr Id VarSet -> Id -> [AnnAlt Id VarSet]
+ -> Bool -- True <=> is an unboxed tuple case, don't enter the result
+ -> BcM BCInstrList
+doCase d s p (_,scrut)
+ bndr alts is_unboxed_tuple
+ = let
-- Top of stack is the return itbl, as usual.
-- underneath it is the pointer to the alt_code BCO.
-- When an alt is entered, it assumes the returned value is
-- on top of the itbl.
ret_frame_sizeW = 2
- -- Env and depth in which to compile the alts, not including
+ -- An unlifted value gets an extra info table pushed on top
+ -- when it is returned.
+ unlifted_itbl_sizeW | isAlgCase = 0
+ | otherwise = 1
+
+ -- depth of stack after the return value has been pushed
+ d_bndr = d + ret_frame_sizeW + idSizeW bndr
+
+ -- depth of stack after the extra info table for an unboxed return
+ -- has been pushed, if any. This is the stack depth at the
+ -- continuation.
+ d_alts = d_bndr + unlifted_itbl_sizeW
+
+ -- Env in which to compile the alts, not including
-- any vars bound by the alts themselves
- d' = d + ret_frame_sizeW + taggedIdSizeW bndr
- p' = addToFM p bndr (d' - 1)
+ p_alts = addToFM p bndr (d_bndr - 1)
- scrut_primrep = typePrimRep (idType bndr)
- isAlgCase
- = case scrut_primrep of
- IntRep -> False ; FloatRep -> False ; DoubleRep -> False
- PtrRep -> True
- other -> pprPanic "ByteCodeGen.schemeE" (ppr other)
+ bndr_ty = idType bndr
+ isAlgCase = not (isUnLiftedType bndr_ty) && not is_unboxed_tuple
-- given an alt, return a discr and code for it.
- codeAlt alt@(discr, binds_f, rhs)
- | isAlgCase
- = let binds_r = reverse binds_f
- binds_r_szsw = map untaggedIdSizeW binds_r
- binds_szw = sum binds_r_szsw
- p'' = addListToFM
- p' (zip binds_r (mkStackOffsets d' binds_r_szsw))
- d'' = d' + binds_szw
- unpack_code = mkUnpackCode 0 0 (map (typePrimRep.idType) binds_f)
- in schemeE d'' s p'' rhs `thenBc` \ rhs_code ->
- returnBc (my_discr alt, unpack_code `appOL` rhs_code)
- | otherwise
- = ASSERT(null binds_f)
- schemeE d' s p' rhs `thenBc` \ rhs_code ->
- returnBc (my_discr alt, rhs_code)
-
- my_discr (DEFAULT, binds, rhs) = NoDiscr
- my_discr (DataAlt dc, binds, rhs) = DiscrP (dataConTag dc - fIRST_TAG)
+ codeALt alt@(DEFAULT, _, (_,rhs))
+ = schemeE d_alts s p_alts rhs `thenBc` \ rhs_code ->
+ returnBc (NoDiscr, rhs_code)
+ codeAlt alt@(discr, bndrs, (_,rhs))
+ -- primitive or nullary constructor alt: no need to UNPACK
+ | null real_bndrs = do
+ rhs_code <- schemeE d_alts s p_alts rhs
+ returnBc (my_discr alt, rhs_code)
+ -- algebraic alt with some binders
+ | ASSERT(isAlgCase) otherwise =
+ let
+ (ptrs,nptrs) = partition (isFollowableArg.idCgRep) real_bndrs
+ ptr_sizes = map idSizeW ptrs
+ nptrs_sizes = map idSizeW nptrs
+ bind_sizes = ptr_sizes ++ nptrs_sizes
+ size = sum ptr_sizes + sum nptrs_sizes
+ -- the UNPACK instruction unpacks in reverse order...
+ p' = addListToFM p_alts
+ (zip (reverse (ptrs ++ nptrs))
+ (mkStackOffsets d_alts (reverse bind_sizes)))
+ in do
+ rhs_code <- schemeE (d_alts+size) s p' rhs
+ return (my_discr alt, unitOL (UNPACK size) `appOL` rhs_code)
+ where
+ real_bndrs = filter (not.isTyVar) bndrs
+
+
+ my_discr (DEFAULT, binds, rhs) = NoDiscr {-shouldn't really happen-}
+ my_discr (DataAlt dc, binds, rhs)
+ | isUnboxedTupleCon dc
+ = unboxedTupleException
+ | otherwise
+ = DiscrP (dataConTag dc - fIRST_TAG)
my_discr (LitAlt l, binds, rhs)
= case l of MachInt i -> DiscrI (fromInteger i)
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
[] -> Nothing
(dc:_) -> Just (tyConFamilySize (dataConTyCon dc))
- in
- mapBc codeAlt alts `thenBc` \ alt_stuff ->
- mkMultiBranch maybe_ncons alt_stuff `thenBc` \ alt_final ->
+ -- the bitmap is relative to stack depth d, i.e. before the
+ -- BCO, info table and return value are pushed on.
+ -- This bit of code is v. similar to buildLivenessMask in CgBindery,
+ -- except that here we build the bitmap from the known bindings of
+ -- things that are pointers, whereas in CgBindery the code builds the
+ -- bitmap from the free slots and unboxed bindings.
+ -- (ToDo: merge?)
+ bitmap = intsToReverseBitmap d{-size-} (sortLe (<=) rel_slots)
+ where
+ binds = fmToList p
+ rel_slots = 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_final_ac = ARGCHECK (taggedIdSizeW bndr) `consOL` alt_final
alt_bco_name = getName bndr
- alt_bco = mkProtoBCO alt_bco_name alt_final_ac (Left alts)
+ alt_bco = mkProtoBCO alt_bco_name alt_final (Left alts)
+ 0{-no arity-} d{-bitmap size-} bitmap True{-is alts-}
+ -- in
+-- trace ("case: bndr = " ++ showSDocDebug (ppr bndr) ++ "\ndepth = " ++ show d ++ "\nenv = \n" ++ showSDocDebug (ppBCEnv p) ++
+-- "\n bitmap = " ++ show bitmap) $ do
+ 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)
+ returnBc (push_alts `consOL` scrut_code)
+
+
+-- -----------------------------------------------------------------------------
+-- Deal with a CCall.
+
+-- Taggedly push the args onto the stack R->L,
+-- deferencing ForeignObj#s and adjusting addrs to point to
+-- payloads in Ptr/Byte arrays. Then, generate the marshalling
+-- (machine) code for the ccall, and create bytecodes to call that and
+-- then return in the right way.
+
+generateCCall :: Int -> Sequel -- stack and sequel depths
+ -> BCEnv
+ -> CCallSpec -- where to call
+ -> Id -- of target, for type info
+ -> [AnnExpr' Id VarSet] -- args (atoms)
+ -> BcM BCInstrList
+
+generateCCall d0 s p ccall_spec@(CCallSpec target cconv safety) fn args_r_to_l
+ = let
+ -- useful constants
+ addr_sizeW = cgRepSizeW NonPtrArg
+
+ -- Get the args on the stack, with tags and suitably
+ -- dereferenced for the CCall. For each arg, return the
+ -- depth to the first word of the bits for that arg, and the
+ -- CgRep of what was actually pushed.
+
+ pargs d [] = returnBc []
+ pargs d (a:az)
+ = let arg_ty = repType (exprType (deAnnotate' a))
+
+ in case splitTyConApp_maybe arg_ty of
+ -- Don't push the FO; instead push the Addr# it
+ -- contains.
+ Just (t, _)
+ | t == arrayPrimTyCon || t == mutableArrayPrimTyCon
+ -> pargs (d + addr_sizeW) az `thenBc` \ rest ->
+ parg_ArrayishRep arrPtrsHdrSize d p a
+ `thenBc` \ code ->
+ returnBc ((code,NonPtrArg):rest)
+
+ | t == byteArrayPrimTyCon || t == mutableByteArrayPrimTyCon
+ -> pargs (d + addr_sizeW) az `thenBc` \ rest ->
+ parg_ArrayishRep arrWordsHdrSize d p a
+ `thenBc` \ code ->
+ returnBc ((code,NonPtrArg):rest)
+
+ -- Default case: push taggedly, but otherwise intact.
+ other
+ -> pushAtom d p a `thenBc` \ (code_a, sz_a) ->
+ pargs (d+sz_a) az `thenBc` \ rest ->
+ returnBc ((code_a, atomRep a) : rest)
+
+ -- Do magic for Ptr/Byte arrays. Push a ptr to the array on
+ -- the stack but then advance it over the headers, so as to
+ -- point to the payload.
+ parg_ArrayishRep hdrSize d p a
+ = pushAtom d p a `thenBc` \ (push_fo, _) ->
+ -- The ptr points at the header. Advance it over the
+ -- header and then pretend this is an Addr#.
+ returnBc (push_fo `snocOL` SWIZZLE 0 hdrSize)
+
+ in
+ pargs d0 args_r_to_l `thenBc` \ code_n_reps ->
+ let
+ (pushs_arg, a_reps_pushed_r_to_l) = unzip code_n_reps
+
+ push_args = concatOL pushs_arg
+ d_after_args = d0 + sum (map cgRepSizeW a_reps_pushed_r_to_l)
+ a_reps_pushed_RAW
+ | null a_reps_pushed_r_to_l || head a_reps_pushed_r_to_l /= VoidArg
+ = panic "ByteCodeGen.generateCCall: missing or invalid World token?"
+ | otherwise
+ = reverse (tail a_reps_pushed_r_to_l)
+
+ -- Now: a_reps_pushed_RAW are the reps which are actually on the stack.
+ -- push_args is the code to do that.
+ -- d_after_args is the stack depth once the args are on.
+
+ -- Get the result rep.
+ (returns_void, r_rep)
+ = case maybe_getCCallReturnRep (idType fn) of
+ Nothing -> (True, VoidArg)
+ Just rr -> (False, rr)
+ {-
+ Because the Haskell stack grows down, the a_reps refer to
+ lowest to highest addresses in that order. The args for the call
+ are on the stack. Now push an unboxed Addr# indicating
+ the C function to call. Then push a dummy placeholder for the
+ result. Finally, emit a CCALL insn with an offset pointing to the
+ Addr# just pushed, and a literal field holding the mallocville
+ address of the piece of marshalling code we generate.
+ So, just prior to the CCALL insn, the stack looks like this
+ (growing down, as usual):
+
+ <arg_n>
+ ...
+ <arg_1>
+ Addr# address_of_C_fn
+ <placeholder-for-result#> (must be an unboxed type)
+
+ The interpreter then calls the marshall code mentioned
+ in the CCALL insn, passing it (& <placeholder-for-result#>),
+ that is, the addr of the topmost word in the stack.
+ When this returns, the placeholder will have been
+ filled in. The placeholder is slid down to the sequel
+ depth, and we RETURN.
+
+ This arrangement makes it simple to do f-i-dynamic since the Addr#
+ value is the first arg anyway.
+
+ The marshalling code is generated specifically for this
+ call site, and so knows exactly the (Haskell) stack
+ offsets of the args, fn address and placeholder. It
+ copies the args to the C stack, calls the stacked addr,
+ and parks the result back in the placeholder. The interpreter
+ calls it as a normal C call, assuming it has a signature
+ void marshall_code ( StgWord* ptr_to_top_of_stack )
+ -}
+ -- resolve static address
+ get_target_info
+ = case target of
+ DynamicTarget
+ -> returnBc (False, panic "ByteCodeGen.generateCCall(dyn)")
+ StaticTarget target
+ -> ioToBc (lookupStaticPtr target) `thenBc` \res ->
+ returnBc (True, res)
+ in
+ get_target_info `thenBc` \ (is_static, static_target_addr) ->
+ let
+
+ -- Get the arg reps, zapping the leading Addr# in the dynamic case
+ a_reps -- | trace (showSDoc (ppr a_reps_pushed_RAW)) False = error "???"
+ | 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 the Addr#
+ (push_Addr, d_after_Addr)
+ | is_static
+ = (toOL [PUSH_UBX (Right static_target_addr) addr_sizeW],
+ d_after_args + addr_sizeW)
+ | otherwise -- is already on the stack
+ = (nilOL, d_after_args)
+
+ -- Push the return placeholder. For a call returning nothing,
+ -- this is a VoidArg (tag).
+ r_sizeW = cgRepSizeW 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))
+
+ -- generate the marshalling code we're going to call
+ r_offW = 0
+ addr_offW = r_sizeW
+ arg1_offW = r_sizeW + addr_sizeW
+ args_offW = map (arg1_offW +)
+ (init (scanl (+) 0 (map cgRepSizeW a_reps)))
+ in
+ ioToBc (mkMarshalCode cconv
+ (r_offW, r_rep) addr_offW
+ (zip args_offW a_reps)) `thenBc` \ addr_of_marshaller ->
+ recordMallocBc addr_of_marshaller `thenBc_`
+ let
+ -- Offset of the next stack frame down the stack. The CCALL
+ -- instruction needs to describe the chunk of stack containing
+ -- the ccall args to the GC, so it needs to know how large it
+ -- is. See comment in Interpreter.c with the CCALL instruction.
+ stk_offset = d_after_r - s
+
+ -- do the call
+ do_call = unitOL (CCALL stk_offset (castPtr addr_of_marshaller))
+ -- slide and return
+ wrapup = mkSLIDE r_sizeW (d_after_r - r_sizeW - s)
+ `snocOL` RETURN_UBX r_rep
in
- schemeE (d + ret_frame_sizeW)
- (d + ret_frame_sizeW) p scrut `thenBc` \ scrut_code ->
+ --trace (show (arg1_offW, args_offW , (map cgRepSizeW a_reps) )) $
+ returnBc (
+ push_args `appOL`
+ push_Addr `appOL` push_r `appOL` do_call `appOL` wrapup
+ )
+
+
+-- Make a dummy literal, to be used as a placeholder for FFI return
+-- values on the stack.
+mkDummyLiteral :: CgRep -> Literal
+mkDummyLiteral pr
+ = case pr of
+ NonPtrArg -> MachWord 0
+ DoubleArg -> MachDouble 0
+ FloatArg -> MachFloat 0
+ _ -> moan64 "mkDummyLiteral" (ppr pr)
+
+
+-- Convert (eg)
+-- GHC.Prim.Char# -> GHC.Prim.State# GHC.Prim.RealWorld
+-- -> (# GHC.Prim.State# GHC.Prim.RealWorld, GHC.Prim.Int# #)
+--
+-- to Just IntRep
+-- and check that an unboxed pair is returned wherein the first arg is VoidArg'd.
+--
+-- Alternatively, for call-targets returning nothing, convert
+--
+-- GHC.Prim.Char# -> GHC.Prim.State# GHC.Prim.RealWorld
+-- -> (# GHC.Prim.State# GHC.Prim.RealWorld #)
+--
+-- to Nothing
+
+maybe_getCCallReturnRep :: Type -> Maybe CgRep
+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 typeCgRep tys)
+ Nothing -> blargh
+ ok = ( ( r_reps `lengthIs` 2 && VoidArg == head r_reps)
+ || r_reps == [VoidArg] )
+ && isUnboxedTupleTyCon r_tycon
+ && case maybe_r_rep_to_go of
+ Nothing -> True
+ Just r_rep -> r_rep /= PtrArg
+ -- if it was, it would be impossible
+ -- to create a valid return value
+ -- placeholder on the stack
+ blargh = pprPanic "maybe_getCCallReturn: can't handle:"
+ (pprType fn_ty)
+ in
+ --trace (showSDoc (ppr (a_reps, r_reps))) $
+ if ok then maybe_r_rep_to_go else blargh
+
+-- Compile code which expects an unboxed Int on the top of stack,
+-- (call it i), and pushes the i'th closure in the supplied list
+-- as a consequence.
+implement_tagToId :: [Name] -> BcM BCInstrList
+implement_tagToId names
+ = ASSERT( notNull names )
+ getLabelsBc (length names) `thenBc` \ labels ->
+ getLabelBc `thenBc` \ label_fail ->
+ getLabelBc `thenBc` \ label_exit ->
+ zip4 labels (tail labels ++ [label_fail])
+ [0 ..] names `bind` \ infos ->
+ map (mkStep label_exit) infos `bind` \ steps ->
+ returnBc (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]
- emitBc alt_bco `thenBc_`
- returnBc (PUSH_AS alt_bco_name scrut_primrep `consOL` scrut_code)
+-- -----------------------------------------------------------------------------
+-- pushAtom
-schemeE d s p (fvs, AnnNote note body)
- = schemeE d s p body
+-- Push an atom onto the stack, returning suitable code & number of
+-- stack words used.
+--
+-- The env p must map each variable to the highest- numbered stack
+-- slot for it. For example, if the stack has depth 4 and we
+-- tagged-ly push (v :: Int#) on it, the value will be in stack[4],
+-- the tag in stack[5], the stack will have depth 6, and p must map v
+-- to 5 and not to 4. Stack locations are numbered from zero, so a
+-- depth 6 stack has valid words 0 .. 5.
-schemeE d s p other
- = pprPanic "ByteCodeGen.schemeE: unhandled case"
- (pprCoreExpr (deAnnotate other))
+pushAtom :: Int -> BCEnv -> AnnExpr' Id VarSet -> BcM (BCInstrList, Int)
+pushAtom d p (AnnApp f (_, AnnType _))
+ = pushAtom d p (snd f)
--- Compile code to do a tail call. Doesn't need to be monadic.
-schemeT :: Bool -- do tagging?
- -> Int -- Stack depth
- -> Sequel -- Sequel depth
- -> Int -- # arg words so far
- -> BCEnv -- stack env
- -> AnnExpr Id VarSet
- -> BCInstrList
-
-schemeT enTag d s narg_words p (_, AnnApp f a)
- = case snd a of
- AnnType _ -> schemeT enTag d s narg_words p f
- other
- -> let (push, arg_words) = pushAtom enTag d p (snd a)
- in push
- `appOL` schemeT enTag (d+arg_words) s (narg_words+arg_words) p f
-
-schemeT enTag d s narg_words p (_, AnnVar f)
- | Just con <- isDataConId_maybe f
- = ASSERT(enTag == False)
- --trace ("schemeT: d = " ++ show d ++ ", s = " ++ show s ++ ", naw = " ++ show narg_words) (
- PACK con narg_words `consOL` (mkSLIDE 1 (d - narg_words - s) `snocOL` ENTER)
- --)
- | otherwise
- = ASSERT(enTag == True)
- let (push, arg_words) = pushAtom True d p (AnnVar f)
- in push
- `appOL` mkSLIDE (narg_words+arg_words) (d - s - narg_words)
- `snocOL` ENTER
-
-mkSLIDE n d
- = if d == 0 then nilOL else unitOL (SLIDE n d)
-
-should_args_be_tagged (_, AnnVar v)
- = case isDataConId_maybe v of
- Just dcon -> False; Nothing -> True
-should_args_be_tagged (_, AnnApp f a)
- = should_args_be_tagged f
-should_args_be_tagged (_, other)
- = panic "should_args_be_tagged: tail call to non-con, non-var"
-
-
--- Make code to unpack a constructor onto the stack, adding
--- tags for the unboxed bits. Takes the PrimReps of the constructor's
--- arguments, and a travelling offset along both the constructor
--- (off_h) and the stack (off_s).
-mkUnpackCode :: Int -> Int -> [PrimRep] -> BCInstrList
-mkUnpackCode off_h off_s [] = nilOL
-mkUnpackCode off_h off_s (r:rs)
- | isFollowableRep r
- = let (rs_ptr, rs_nptr) = span isFollowableRep (r:rs)
- ptrs_szw = sum (map untaggedSizeW rs_ptr)
- in ASSERT(ptrs_szw == length rs_ptr)
- ASSERT(off_h == 0)
- ASSERT(off_s == 0)
- UNPACK ptrs_szw
- `consOL` mkUnpackCode (off_h + ptrs_szw) (off_s + ptrs_szw) rs_nptr
- | otherwise
- = case r of
- IntRep -> approved
- FloatRep -> approved
- DoubleRep -> approved
- where
- approved = UPK_TAG usizeW off_h off_s `consOL` theRest
- theRest = mkUnpackCode (off_h + usizeW) (off_s + tsizeW) rs
- usizeW = untaggedSizeW r
- tsizeW = taggedSizeW r
+pushAtom d p (AnnNote note e)
+ = pushAtom d p (snd e)
--- Push an atom onto the stack, returning suitable code & number of
--- stack words used. Pushes it either tagged or untagged, since
--- pushAtom is used to set up the stack prior to copying into the
--- heap for both APs (requiring tags) and constructors (which don't).
---
--- NB this means NO GC between pushing atoms for a constructor and
--- copying them into the heap. It probably also means that
--- tail calls MUST be of the form atom{atom ... atom} since if the
--- expression head was allowed to be arbitrary, there could be GC
--- in between pushing the arg atoms and completing the head.
--- (not sure; perhaps the allocate/doYouWantToGC interface means this
--- isn't a problem; but only if arbitrary graph construction for the
--- head doesn't leave this BCO, since GC might happen at the start of
--- each BCO (we consult doYouWantToGC there).
---
--- Blargh. JRS 001206
---
--- NB (further) that the env p must map each variable to the highest-
--- numbered stack slot for it. For example, if the stack has depth 4
--- and we tagged-ly push (v :: Int#) on it, the value will be in stack[4],
--- the tag in stack[5], the stack will have depth 6, and p must map v to
--- 5 and not to 4. Stack locations are numbered from zero, so a depth
--- 6 stack has valid words 0 .. 5.
-
-pushAtom :: Bool -> Int -> BCEnv -> AnnExpr' Id VarSet -> (BCInstrList, Int)
-pushAtom tagged d p (AnnVar v)
- = let str = "\npushAtom " ++ showSDocDebug (ppr v) ++ ", depth = " ++ show d
- ++ ", env =\n" ++
- showSDocDebug (nest 4 (vcat (map ppr (fmToList p))))
- ++ " -->\n" ++
- showSDoc (nest 4 (vcat (map ppr (fromOL (fst result)))))
- ++ "\nendPushAtom " ++ showSDocDebug (ppr v)
- str' = if str == str then str else str
-
- result
- = case lookupBCEnv_maybe p v of
- Just d_v -> (toOL (nOfThem nwords (PUSH_L (d-d_v+sz_t-2))), sz_t)
- Nothing -> ASSERT(sz_t == 1) (unitOL (PUSH_G nm), sz_t)
-
- nm = case isDataConId_maybe v of
- Just c -> getName c
- Nothing -> getName v
-
- sz_t = taggedIdSizeW v
- sz_u = untaggedIdSizeW v
- nwords = if tagged then sz_t else sz_u
- in
- --trace str'
- result
+pushAtom d p (AnnLam x e)
+ | isTyVar x
+ = pushAtom d p (snd e)
+
+pushAtom d p (AnnVar v)
+
+ | idCgRep v == VoidArg
+ = returnBc (nilOL, 0)
+
+ | isFCallId v
+ = pprPanic "pushAtom: shouldn't get an FCallId here" (ppr v)
+
+ | Just primop <- isPrimOpId_maybe v
+ = returnBc (unitOL (PUSH_PRIMOP primop), 1)
-pushAtom True d p (AnnLit lit)
- = let (ubx_code, ubx_size) = pushAtom False d p (AnnLit lit)
- in (ubx_code `snocOL` PUSH_TAG ubx_size, 1 + ubx_size)
+ | Just d_v <- lookupBCEnv_maybe p v -- v is a local variable
+ = returnBc (toOL (nOfThem sz (PUSH_L (d-d_v+sz-2))), sz)
+ -- d - d_v the number of words between the TOS
+ -- and the 1st slot of the object
+ --
+ -- d - d_v - 1 the offset from the TOS of the 1st slot
+ --
+ -- d - d_v - 1 + sz - 1 the offset from the TOS of the last slot
+ -- of the object.
+ --
+ -- Having found the last slot, we proceed to copy the right number of
+ -- slots on to the top of the stack.
-pushAtom False d p (AnnLit lit)
+ | otherwise -- v must be a global variable
+ = ASSERT(sz == 1)
+ returnBc (unitOL (PUSH_G (getName v)), sz)
+
+ where
+ sz = idSizeW v
+
+
+pushAtom d p (AnnLit lit)
= case lit of
- MachInt i -> code IntRep
- MachFloat r -> code FloatRep
- MachDouble r -> code DoubleRep
- MachChar c -> code CharRep
- MachStr s -> pushStr s
+ MachLabel fs _ -> code NonPtrArg
+ MachWord w -> code NonPtrArg
+ MachInt i -> code PtrArg
+ MachFloat r -> code FloatArg
+ MachDouble r -> code DoubleArg
+ MachChar c -> code NonPtrArg
+ MachStr s -> pushStr s
where
code rep
- = let size_host_words = untaggedSizeW rep
- in (unitOL (PUSH_UBX lit size_host_words), size_host_words)
+ = let size_host_words = cgRepSizeW rep
+ in returnBc (unitOL (PUSH_UBX (Left lit) size_host_words),
+ size_host_words)
pushStr s
- = let mallocvilleAddr
+ = let getMallocvilleAddr
= case s of
- CharStr s i -> A# s
-
FastString _ l ba ->
-- sigh, a string in the heap is no good to us.
-- We need a static C pointer, since the type of
-- a string literal is Addr#. So, copy the string
- -- into C land and introduce a memory leak
- -- at the same time.
+ -- into C land and remember the pointer so we can
+ -- free it later.
let n = I# l
-- CAREFUL! Chars are 32 bits in ghc 4.09+
- in unsafePerformIO (
- do a@(Ptr addr) <- mallocBytes (n+1)
- strncpy a ba (fromIntegral n)
- writeCharOffAddr addr n '\0'
- return addr
+ in ioToBc (mallocBytes (n+1)) `thenBc` \ ptr ->
+ recordMallocBc ptr `thenBc_`
+ ioToBc (
+ do memcpy ptr ba (fromIntegral n)
+ pokeByteOff ptr n (fromIntegral (ord '\0') :: Word8)
+ return ptr
)
- _ -> panic "StgInterp.lit2expr: unhandled string constant type"
-
- addrLit
- = MachInt (toInteger (addrToInt mallocvilleAddr))
+ other -> panic "ByteCodeGen.pushAtom.pushStr"
in
+ getMallocvilleAddr `thenBc` \ addr ->
-- Get the addr on the stack, untaggedly
- (unitOL (PUSH_UBX addrLit 1), 1)
-
-
-
-
+ returnBc (unitOL (PUSH_UBX (Right addr) 1), 1)
-pushAtom tagged d p (AnnApp f (_, AnnType _))
- = pushAtom tagged d p (snd f)
-
-pushAtom tagged d p other
+pushAtom d p other
= pprPanic "ByteCodeGen.pushAtom"
(pprCoreExpr (deAnnotate (undefined, other)))
-foreign import "strncpy" strncpy :: Ptr a -> ByteArray# -> CInt -> IO ()
+foreign import ccall unsafe "memcpy"
+ memcpy :: Ptr a -> ByteArray# -> CInt -> IO ()
+-- -----------------------------------------------------------------------------
-- Given a bunch of alts code and their discrs, do the donkey work
-- of making a multiway branch using a switch tree.
-- What a load of hassle!
+
mkMultiBranch :: Maybe Int -- # datacons in tycon, if alg alt
-- a hint; generates better code
-- Nothing is always safe
-> BcM BCInstrList
mkMultiBranch maybe_ncons raw_ways
= let d_way = filter (isNoDiscr.fst) raw_ways
- notd_ways = naturalMergeSortLe
+ notd_ways = sortLe
(\w1 w2 -> leAlt (fst w1) (fst w2))
(filter (not.isNoDiscr.fst) raw_ways)
in
mkTree notd_ways init_lo init_hi
-\end{code}
-%************************************************************************
-%* *
-\subsection{Supporting junk for the compilation schemes}
-%* *
-%************************************************************************
-
-\begin{code}
+-- -----------------------------------------------------------------------------
+-- Supporting junk for the compilation schemes
-- Describes case alts
data Discr
ppr NoDiscr = text "DEF"
--- Find things in the BCEnv (the what's-on-the-stack-env)
--- See comment preceding pushAtom for precise meaning of env contents
---lookupBCEnv :: BCEnv -> Id -> Int
---lookupBCEnv env nm
--- = case lookupFM env nm of
--- Nothing -> pprPanic "lookupBCEnv"
--- (ppr nm $$ char ' ' $$ vcat (map ppr (fmToList env)))
--- Just xx -> xx
-
lookupBCEnv_maybe :: BCEnv -> Id -> Maybe Int
lookupBCEnv_maybe = lookupFM
+idSizeW :: Id -> Int
+idSizeW id = cgRepSizeW (typeCgRep (idType id))
--- When I push one of these on the stack, how much does Sp move by?
-taggedSizeW :: PrimRep -> Int
-taggedSizeW pr
- | isFollowableRep pr = 1
- | otherwise = 1{-the tag-} + getPrimRepSize pr
-
-
--- The plain size of something, without tag.
-untaggedSizeW :: PrimRep -> Int
-untaggedSizeW pr
- | isFollowableRep pr = 1
- | otherwise = getPrimRepSize pr
-
-
-taggedIdSizeW, untaggedIdSizeW :: Id -> Int
-taggedIdSizeW = taggedSizeW . typePrimRep . idType
-untaggedIdSizeW = untaggedSizeW . typePrimRep . idType
+unboxedTupleException :: a
+unboxedTupleException
+ = throwDyn
+ (Panic
+ ("Bytecode generator can't handle unboxed tuples. Possibly due\n" ++
+ "\tto foreign import/export decls in source. Workaround:\n" ++
+ "\tcompile this module to a .o file, then restart session."))
-\end{code}
-
-%************************************************************************
-%* *
-\subsection{The bytecode generator's monad}
-%* *
-%************************************************************************
-
-\begin{code}
-data BcM_State
- = BcM_State { bcos :: [ProtoBCO Name], -- accumulates completed BCOs
- nextlabel :: Int } -- for generating local labels
-
-type BcM result = BcM_State -> (result, BcM_State)
-
-runBc :: BcM_State -> BcM () -> BcM_State
-runBc init_st m = case m init_st of { (r,st) -> st }
-
-thenBc :: BcM a -> (a -> BcM b) -> BcM b
-thenBc expr cont st
- = case expr st of { (result, st') -> cont result st' }
-
-thenBc_ :: BcM a -> BcM b -> BcM b
-thenBc_ expr cont st
- = case expr st of { (result, st') -> cont st' }
-returnBc :: a -> BcM a
-returnBc result st = (result, st)
+mkSLIDE n d = if d == 0 then nilOL else unitOL (SLIDE n d)
+bind x f = f x
-mapBc :: (a -> BcM b) -> [a] -> BcM [b]
-mapBc f [] = returnBc []
-mapBc f (x:xs)
- = f x `thenBc` \ r ->
- mapBc f xs `thenBc` \ rs ->
- returnBc (r:rs)
+splitApp :: AnnExpr' id ann -> (AnnExpr' id ann, [AnnExpr' id ann])
+ -- The arguments are returned in *right-to-left* order
+splitApp (AnnApp (_,f) (_,a))
+ | isTypeAtom a = splitApp f
+ | otherwise = case splitApp f of
+ (f', as) -> (f', a:as)
+splitApp (AnnNote n (_,e)) = splitApp e
+splitApp e = (e, [])
-emitBc :: ProtoBCO Name -> BcM ()
-emitBc bco st
- = ((), st{bcos = bco : bcos st})
-getLabelBc :: BcM Int
-getLabelBc st
- = (nextlabel st, st{nextlabel = 1 + nextlabel st})
-
-\end{code}
+isTypeAtom :: AnnExpr' id ann -> Bool
+isTypeAtom (AnnType _) = True
+isTypeAtom _ = False
-%************************************************************************
-%* *
-\subsection{The bytecode assembler}
-%* *
-%************************************************************************
+isVoidArgAtom :: AnnExpr' id ann -> Bool
+isVoidArgAtom (AnnVar v) = typeCgRep (idType v) == VoidArg
+isVoidArgAtom (AnnNote n (_,e)) = isVoidArgAtom e
+isVoidArgAtom _ = False
-The object format for bytecodes is: 16 bits for the opcode, and 16 for
-each field -- so the code can be considered a sequence of 16-bit ints.
-Each field denotes either a stack offset or number of items on the
-stack (eg SLIDE), and index into the pointer table (eg PUSH_G), an
-index into the literal table (eg PUSH_I/D/L), or a bytecode address in
-this BCO.
+atomRep :: AnnExpr' Id ann -> CgRep
+atomRep (AnnVar v) = typeCgRep (idType v)
+atomRep (AnnLit l) = typeCgRep (literalType l)
+atomRep (AnnNote n b) = atomRep (snd b)
+atomRep (AnnApp f (_, AnnType _)) = atomRep (snd f)
+atomRep (AnnLam x e) | isTyVar x = atomRep (snd e)
+atomRep other = pprPanic "atomRep" (ppr (deAnnotate (undefined,other)))
-\begin{code}
--- Top level assembler fn.
-assembleBCO :: ProtoBCO Name -> IO UnlinkedBCO
-
-assembleBCO (ProtoBCO nm instrs origin)
- = let
- -- pass 1: collect up the offsets of the local labels.
- -- Remember that the first insn starts at offset 1 since offset 0
- -- (eventually) will hold the total # of insns.
- label_env = mkLabelEnv emptyFM 1 instrs
-
- mkLabelEnv env i_offset [] = env
- mkLabelEnv env i_offset (i:is)
- = let new_env
- = case i of LABEL n -> addToFM env n i_offset ; _ -> env
- in mkLabelEnv new_env (i_offset + instrSize16s i) is
-
- findLabel lab
- = case lookupFM label_env lab of
- Just bco_offset -> bco_offset
- Nothing -> pprPanic "assembleBCO.findLabel" (int lab)
- in
- do -- pass 2: generate the instruction, ptr and nonptr bits
- insns <- return emptySS :: IO (SizedSeq Word16)
- lits <- return emptySS :: IO (SizedSeq Word)
- ptrs <- return emptySS :: IO (SizedSeq Name)
- itbls <- return emptySS :: IO (SizedSeq Name)
- let init_asm_state = (insns,lits,ptrs,itbls)
- (final_insns, final_lits, final_ptrs, final_itbls)
- <- mkBits findLabel init_asm_state instrs
-
- return (UnlinkedBCO nm final_insns final_lits final_ptrs final_itbls)
-
--- instrs nonptrs ptrs itbls
-type AsmState = (SizedSeq Word16, SizedSeq Word, SizedSeq Name, SizedSeq Name)
-
-data SizedSeq a = SizedSeq !Int [a]
-emptySS = SizedSeq 0 []
-addToSS (SizedSeq n r_xs) x = return (SizedSeq (n+1) (x:r_xs))
-addListToSS (SizedSeq n r_xs) xs
- = return (SizedSeq (n + length xs) (reverse xs ++ r_xs))
-sizeSS (SizedSeq n r_xs) = n
-listFromSS (SizedSeq n r_xs) = return (reverse r_xs)
-
-
--- This is where all the action is (pass 2 of the assembler)
-mkBits :: (Int -> Int) -- label finder
- -> AsmState
- -> [BCInstr] -- instructions (in)
- -> IO AsmState
-
-mkBits findLabel st proto_insns
- = foldM doInstr st proto_insns
- where
- doInstr :: AsmState -> BCInstr -> IO AsmState
- doInstr st i
- = case i of
- ARGCHECK n -> instr2 st i_ARGCHECK n
- PUSH_L o1 -> instr2 st i_PUSH_L o1
- PUSH_LL o1 o2 -> instr3 st i_PUSH_LL o1 o2
- PUSH_LLL o1 o2 o3 -> instr4 st i_PUSH_LLL o1 o2 o3
- PUSH_G nm -> do (p, st2) <- ptr st nm
- instr2 st2 i_PUSH_G p
- PUSH_AS nm pk -> do (p, st2) <- ptr st nm
- (np, st3) <- ctoi_itbl st2 pk
- instr3 st3 i_PUSH_AS p np
- PUSH_UBX lit nws -> do (np, st2) <- literal st lit
- instr3 st2 i_PUSH_UBX np nws
- PUSH_TAG tag -> instr2 st i_PUSH_TAG tag
- SLIDE n by -> instr3 st i_SLIDE n by
- ALLOC n -> instr2 st i_ALLOC n
- MKAP off sz -> instr3 st i_MKAP off sz
- UNPACK n -> instr2 st i_UNPACK n
- UPK_TAG n m k -> instr4 st i_UPK_TAG n m k
- PACK dcon sz -> do (itbl_no,st2) <- itbl st dcon
- instr3 st2 i_PACK itbl_no sz
- LABEL lab -> return st
- TESTLT_I i l -> do (np, st2) <- int st i
- instr3 st2 i_TESTLT_I np (findLabel l)
- TESTEQ_I i l -> do (np, st2) <- int st i
- instr3 st2 i_TESTEQ_I np (findLabel l)
- TESTLT_F f l -> do (np, st2) <- float st f
- instr3 st2 i_TESTLT_F np (findLabel l)
- TESTEQ_F f l -> do (np, st2) <- float st f
- instr3 st2 i_TESTEQ_F np (findLabel l)
- TESTLT_D d l -> do (np, st2) <- double st d
- instr3 st2 i_TESTLT_D np (findLabel l)
- TESTEQ_D d l -> do (np, st2) <- double st d
- instr3 st2 i_TESTEQ_D np (findLabel l)
- TESTLT_P i l -> instr3 st i_TESTLT_P i (findLabel l)
- TESTEQ_P i l -> instr3 st i_TESTEQ_P i (findLabel l)
- CASEFAIL -> instr1 st i_CASEFAIL
- ENTER -> instr1 st i_ENTER
- RETURN rep -> do (itbl_no,st2) <- itoc_itbl st rep
- instr2 st2 i_RETURN itbl_no
-
- i2s :: Int -> Word16
- i2s = fromIntegral
-
- instr1 (st_i0,st_l0,st_p0,st_I0) i1
- = do st_i1 <- addToSS st_i0 (i2s i1)
- return (st_i1,st_l0,st_p0,st_I0)
-
- instr2 (st_i0,st_l0,st_p0,st_I0) i1 i2
- = do st_i1 <- addToSS st_i0 (i2s i1)
- st_i2 <- addToSS st_i1 (i2s i2)
- return (st_i2,st_l0,st_p0,st_I0)
-
- instr3 (st_i0,st_l0,st_p0,st_I0) i1 i2 i3
- = do st_i1 <- addToSS st_i0 (i2s i1)
- st_i2 <- addToSS st_i1 (i2s i2)
- st_i3 <- addToSS st_i2 (i2s i3)
- return (st_i3,st_l0,st_p0,st_I0)
-
- instr4 (st_i0,st_l0,st_p0,st_I0) i1 i2 i3 i4
- = do st_i1 <- addToSS st_i0 (i2s i1)
- st_i2 <- addToSS st_i1 (i2s i2)
- st_i3 <- addToSS st_i2 (i2s i3)
- st_i4 <- addToSS st_i3 (i2s i4)
- return (st_i4,st_l0,st_p0,st_I0)
-
- float (st_i0,st_l0,st_p0,st_I0) f
- = do let ws = mkLitF f
- st_l1 <- addListToSS st_l0 ws
- return (sizeSS st_l0, (st_i0,st_l1,st_p0,st_I0))
-
- double (st_i0,st_l0,st_p0,st_I0) d
- = do let ws = mkLitD d
- st_l1 <- addListToSS st_l0 ws
- return (sizeSS st_l0, (st_i0,st_l1,st_p0,st_I0))
-
- int (st_i0,st_l0,st_p0,st_I0) i
- = do let ws = mkLitI i
- st_l1 <- addListToSS st_l0 ws
- return (sizeSS st_l0, (st_i0,st_l1,st_p0,st_I0))
-
- addr (st_i0,st_l0,st_p0,st_I0) a
- = do let ws = mkLitA a
- st_l1 <- addListToSS st_l0 ws
- return (sizeSS st_l0, (st_i0,st_l1,st_p0,st_I0))
-
- ptr (st_i0,st_l0,st_p0,st_I0) p
- = do st_p1 <- addToSS st_p0 p
- return (sizeSS st_p0, (st_i0,st_l0,st_p1,st_I0))
-
- itbl (st_i0,st_l0,st_p0,st_I0) dcon
- = do st_I1 <- addToSS st_I0 (getName dcon)
- return (sizeSS st_I0, (st_i0,st_l0,st_p0,st_I1))
-
- literal st (MachInt j) = int st (fromIntegral j)
- literal st (MachFloat r) = float st (fromRational r)
- literal st (MachDouble r) = double st (fromRational r)
- literal st (MachChar c) = int st c
-
- ctoi_itbl st pk
- = addr st ret_itbl_addr
- where
- ret_itbl_addr = case pk of
- PtrRep -> stg_ctoi_ret_R1_info
- IntRep -> stg_ctoi_ret_R1_info
- FloatRep -> stg_ctoi_ret_F1_info
- DoubleRep -> stg_ctoi_ret_D1_info
- _ -> pprPanic "mkBits.ctoi_itbl" (ppr pk)
- where -- TEMP HACK
- stg_ctoi_ret_F1_info = nullAddr
- stg_ctoi_ret_D1_info = nullAddr
-
- itoc_itbl st pk
- = addr st ret_itbl_addr
- where
- ret_itbl_addr = case pk of
- IntRep -> stg_gc_unbx_r1_info
- FloatRep -> stg_gc_f1_info
- DoubleRep -> stg_gc_d1_info
-
-foreign label "stg_ctoi_ret_R1_info" stg_ctoi_ret_R1_info :: Addr
---foreign label "stg_ctoi_ret_F1_info" stg_ctoi_ret_F1_info :: Addr
---foreign label "stg_ctoi_ret_D1_info" stg_ctoi_ret_D1_info :: Addr
-
-foreign label "stg_gc_unbx_r1_info" stg_gc_unbx_r1_info :: Addr
-foreign label "stg_gc_f1_info" stg_gc_f1_info :: Addr
-foreign label "stg_gc_d1_info" stg_gc_d1_info :: Addr
-
--- The size in 16-bit entities of an instruction.
-instrSize16s :: BCInstr -> Int
-instrSize16s instr
- = case instr of
- ARGCHECK _ -> 2
- PUSH_L _ -> 2
- PUSH_LL _ _ -> 3
- PUSH_LLL _ _ _ -> 4
- PUSH_G _ -> 2
- PUSH_AS _ _ -> 3
- PUSH_UBX _ _ -> 3
- PUSH_TAG _ -> 2
- SLIDE _ _ -> 3
- ALLOC _ -> 2
- MKAP _ _ -> 3
- UNPACK _ -> 2
- UPK_TAG _ _ _ -> 4
- PACK _ _ -> 3
- LABEL _ -> 0 -- !!
- TESTLT_I _ _ -> 3
- TESTEQ_I _ _ -> 3
- TESTLT_F _ _ -> 3
- TESTEQ_F _ _ -> 3
- TESTLT_D _ _ -> 3
- TESTEQ_D _ _ -> 3
- TESTLT_P _ _ -> 3
- TESTEQ_P _ _ -> 3
- CASEFAIL -> 1
- ENTER -> 1
- RETURN _ -> 2
-
-
--- Make lists of host-sized words for literals, so that when the
--- words are placed in memory at increasing addresses, the
--- bit pattern is correct for the host's word size and endianness.
-mkLitI :: Int -> [Word]
-mkLitF :: Float -> [Word]
-mkLitD :: Double -> [Word]
-mkLitA :: Addr -> [Word]
-
-mkLitF f
- = runST (do
- arr <- newFloatArray ((0::Int),0)
- writeFloatArray arr 0 f
- f_arr <- castSTUArray arr
- w0 <- readWordArray f_arr 0
- return [w0]
- )
-
-mkLitD d
- | wORD_SIZE == 4
- = runST (do
- arr <- newDoubleArray ((0::Int),0)
- writeDoubleArray arr 0 d
- d_arr <- castSTUArray arr
- w0 <- readWordArray d_arr 0
- w1 <- readWordArray d_arr 1
- return [w0,w1]
- )
- | wORD_SIZE == 8
- = runST (do
- arr <- newDoubleArray ((0::Int),0)
- writeDoubleArray arr 0 d
- d_arr <- castSTUArray arr
- w0 <- readWordArray d_arr 0
- return [w0]
- )
-
-mkLitI i
- = runST (do
- arr <- newIntArray ((0::Int),0)
- writeIntArray arr 0 i
- i_arr <- castSTUArray arr
- w0 <- readWordArray i_arr 0
- return [w0]
- )
-
-mkLitA a
- = runST (do
- arr <- newAddrArray ((0::Int),0)
- writeAddrArray arr 0 a
- a_arr <- castSTUArray arr
- w0 <- readWordArray a_arr 0
- return [w0]
- )
+isPtrAtom :: AnnExpr' Id ann -> Bool
+isPtrAtom e = atomRep e == PtrArg
-\end{code}
+-- Let szsw be the sizes in words of some items pushed onto the stack,
+-- which has initial depth d'. Return the values which the stack environment
+-- should map these items to.
+mkStackOffsets :: Int -> [Int] -> [Int]
+mkStackOffsets original_depth szsw
+ = map (subtract 1) (tail (scanl (+) original_depth szsw))
-%************************************************************************
-%* *
-\subsection{Linking interpretables into something we can run}
-%* *
-%************************************************************************
+-- -----------------------------------------------------------------------------
+-- The bytecode generator's monad
-\begin{code}
+data BcM_State
+ = BcM_State {
+ nextlabel :: Int, -- for generating local labels
+ malloced :: [Ptr ()] } -- ptrs malloced for current BCO
+ -- Should be free()d when it is GCd
-{-
-data BCO# = BCO# ByteArray# -- instrs :: array Word16#
- ByteArray# -- literals :: array Word32#
- PtrArray# -- ptrs :: Array HValue
- ByteArray# -- itbls :: Array Addr#
--}
+newtype BcM r = BcM (BcM_State -> IO (BcM_State, r))
-GLOBAL_VAR(v_cafTable, [], [HValue])
-
---addCAF :: HValue -> IO ()
---addCAF x = do xs <- readIORef v_cafTable; writeIORef v_cafTable (x:xs)
-
---bcosToHValue :: ItblEnv -> ClosureEnv -> UnlinkedBCOExpr -> IO HValue
---bcosToHValue ie ce (root_bco, other_bcos)
--- = do linked_expr <- linkIExpr ie ce (root_bco, other_bcos)
--- return linked_expr
-
-linkBCO ie ce (UnlinkedBCO nm insnsSS literalsSS ptrsSS itblsSS)
- = do insns <- listFromSS insnsSS
- literals <- listFromSS literalsSS
- ptrs <- listFromSS ptrsSS
- itbls <- listFromSS itblsSS
-
- linked_ptrs <- mapM (lookupCE ce) ptrs
- linked_itbls <- mapM (lookupIE ie) itbls
-
- let n_insns = sizeSS insnsSS
- n_literals = sizeSS literalsSS
- n_ptrs = sizeSS ptrsSS
- n_itbls = sizeSS itblsSS
-
- let ptrs_arr = array (0, n_ptrs-1) (indexify linked_ptrs)
- :: Array Int HValue
- ptrs_parr = case ptrs_arr of Array lo hi parr -> parr
-
- itbls_arr = array (0, n_itbls-1) (indexify linked_itbls)
- :: UArray Int Addr
- itbls_barr = case itbls_arr of UArray lo hi barr -> barr
-
- insns_arr | n_insns > 65535
- = panic "linkBCO: >= 64k insns in BCO"
- | otherwise
- = array (0, n_insns)
- (indexify (fromIntegral n_insns:insns))
- :: UArray Int Word16
- insns_barr = case insns_arr of UArray lo hi barr -> barr
-
- literals_arr = array (0, n_literals-1) (indexify literals)
- :: UArray Int Word
- literals_barr = case literals_arr of UArray lo hi barr -> barr
-
- indexify :: [a] -> [(Int, a)]
- indexify xs = zip [0..] xs
-
- BCO bco# <- newBCO insns_barr literals_barr ptrs_parr itbls_barr
-
- return (unsafeCoerce# bco#)
-
-
-data BCO = BCO BCO#
-
-newBCO :: ByteArray# -> ByteArray# -> Array# a -> ByteArray# -> IO BCO
-newBCO a b c d
- = IO (\s -> case newBCO# a b c d s of (# s1, bco #) -> (# s1, BCO bco #))
-
-
-lookupCE :: ClosureEnv -> Name -> IO HValue
-lookupCE ce nm
- = case lookupFM ce nm of
- Just aa -> return aa
- Nothing
- -> do m <- lookupSymbol (nameToCLabel nm "closure")
- case m of
- Just (A# addr) -> case addrToHValue# addr of
- (# hval #) -> return hval
- Nothing -> pprPanic "ByteCodeGen.lookupCE" (ppr nm)
-
-lookupIE :: ItblEnv -> Name -> IO Addr
-lookupIE ie con_nm
- = case lookupFM ie con_nm of
- Just (Ptr a) -> return a
- Nothing
- -> do -- try looking up in the object files.
- m <- lookupSymbol (nameToCLabel con_nm "con_info")
- case m of
- Just addr -> return addr
- Nothing
- -> do -- perhaps a nullary constructor?
- n <- lookupSymbol (nameToCLabel con_nm "static_info")
- case n of
- Just addr -> return addr
- Nothing -> pprPanic "ByteCodeGen.lookupIE" (ppr con_nm)
-
--- HACK!!! ToDo: cleaner
-nameToCLabel :: Name -> String{-suffix-} -> String
-nameToCLabel n suffix
- = _UNPK_(moduleNameFS (rdrNameModule rn))
- ++ '_':occNameString(rdrNameOcc rn) ++ '_':suffix
- where rn = toRdrName n
+ioToBc :: IO a -> BcM a
+ioToBc io = BcM $ \st -> do
+ x <- io
+ return (st, x)
-\end{code}
+runBc :: BcM r -> IO (BcM_State, r)
+runBc (BcM m) = m (BcM_State 0 [])
-%************************************************************************
-%* *
-\subsection{Manufacturing of info tables for DataCons}
-%* *
-%************************************************************************
+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)
-\begin{code}
+thenBc_ :: BcM a -> BcM b -> BcM b
+thenBc_ (BcM expr) (BcM cont) = BcM $ \st0 -> do
+ (st1, q) <- expr st0
+ (st2, r) <- cont st1
+ return (st2, r)
-#if __GLASGOW_HASKELL__ <= 408
-type ItblPtr = Addr
-#else
-type ItblPtr = Ptr StgInfoTable
-#endif
-
--- Make info tables for the data decls in this module
-mkITbls :: [TyCon] -> IO ItblEnv
-mkITbls [] = return emptyFM
-mkITbls (tc:tcs) = do itbls <- mkITbl tc
- itbls2 <- mkITbls tcs
- return (itbls `plusFM` itbls2)
-
-mkITbl :: TyCon -> IO ItblEnv
-mkITbl tc
- | not (isDataTyCon tc)
- = return emptyFM
- | n == length dcs -- paranoia; this is an assertion.
- = make_constr_itbls dcs
- where
- dcs = tyConDataCons tc
- n = tyConFamilySize tc
-
-cONSTR :: Int
-cONSTR = 1 -- as defined in ghc/includes/ClosureTypes.h
-
--- Assumes constructors are numbered from zero, not one
-make_constr_itbls :: [DataCon] -> IO ItblEnv
-make_constr_itbls cons
- | length cons <= 8
- = do is <- mapM mk_vecret_itbl (zip cons [0..])
- return (listToFM is)
- | otherwise
- = do is <- mapM mk_dirret_itbl (zip cons [0..])
- return (listToFM is)
- where
- mk_vecret_itbl (dcon, conNo)
- = mk_itbl dcon conNo (vecret_entry conNo)
- mk_dirret_itbl (dcon, conNo)
- = mk_itbl dcon conNo stg_interp_constr_entry
-
- mk_itbl :: DataCon -> Int -> Addr -> IO (Name,ItblPtr)
- mk_itbl dcon conNo entry_addr
- = let (tot_wds, ptr_wds, _)
- = mkVirtHeapOffsets typePrimRep (dataConRepArgTys dcon)
- ptrs = ptr_wds
- nptrs = tot_wds - ptr_wds
- itbl = StgInfoTable {
- ptrs = fromIntegral ptrs, nptrs = fromIntegral nptrs,
- tipe = fromIntegral cONSTR,
- srtlen = fromIntegral conNo,
- code0 = fromIntegral code0, code1 = fromIntegral code1,
- code2 = fromIntegral code2, code3 = fromIntegral code3,
- code4 = fromIntegral code4, code5 = fromIntegral code5,
- code6 = fromIntegral code6, code7 = fromIntegral code7
- }
- -- Make a piece of code to jump to "entry_label".
- -- This is the only arch-dependent bit.
- -- On x86, if entry_label has an address 0xWWXXYYZZ,
- -- emit movl $0xWWXXYYZZ,%eax ; jmp *%eax
- -- which is
- -- B8 ZZ YY XX WW FF E0
- (code0,code1,code2,code3,code4,code5,code6,code7)
- = (0xB8, byte 0 entry_addr_w, byte 1 entry_addr_w,
- byte 2 entry_addr_w, byte 3 entry_addr_w,
- 0xFF, 0xE0,
- 0x90 {-nop-})
-
- entry_addr_w :: Word32
- entry_addr_w = fromIntegral (addrToInt entry_addr)
- in
- do addr <- malloc
- --putStrLn ("SIZE of itbl is " ++ show (sizeOf itbl))
- --putStrLn ("# ptrs of itbl is " ++ show ptrs)
- --putStrLn ("# nptrs of itbl is " ++ show nptrs)
- poke addr itbl
- return (getName dcon, addr `plusPtr` 8)
-
-
-byte :: Int -> Word32 -> Word32
-byte 0 w = w .&. 0xFF
-byte 1 w = (w `shiftR` 8) .&. 0xFF
-byte 2 w = (w `shiftR` 16) .&. 0xFF
-byte 3 w = (w `shiftR` 24) .&. 0xFF
-
-
-vecret_entry 0 = stg_interp_constr1_entry
-vecret_entry 1 = stg_interp_constr2_entry
-vecret_entry 2 = stg_interp_constr3_entry
-vecret_entry 3 = stg_interp_constr4_entry
-vecret_entry 4 = stg_interp_constr5_entry
-vecret_entry 5 = stg_interp_constr6_entry
-vecret_entry 6 = stg_interp_constr7_entry
-vecret_entry 7 = stg_interp_constr8_entry
-
--- entry point for direct returns for created constr itbls
-foreign label "stg_interp_constr_entry" stg_interp_constr_entry :: Addr
--- and the 8 vectored ones
-foreign label "stg_interp_constr1_entry" stg_interp_constr1_entry :: Addr
-foreign label "stg_interp_constr2_entry" stg_interp_constr2_entry :: Addr
-foreign label "stg_interp_constr3_entry" stg_interp_constr3_entry :: Addr
-foreign label "stg_interp_constr4_entry" stg_interp_constr4_entry :: Addr
-foreign label "stg_interp_constr5_entry" stg_interp_constr5_entry :: Addr
-foreign label "stg_interp_constr6_entry" stg_interp_constr6_entry :: Addr
-foreign label "stg_interp_constr7_entry" stg_interp_constr7_entry :: Addr
-foreign label "stg_interp_constr8_entry" stg_interp_constr8_entry :: Addr
-
-
-
-
-
--- Ultra-minimalist version specially for constructors
-data StgInfoTable = StgInfoTable {
- ptrs :: Word16,
- nptrs :: Word16,
- srtlen :: Word16,
- tipe :: Word16,
- code0, code1, code2, code3, code4, code5, code6, code7 :: Word8
-}
-
-
-instance Storable StgInfoTable where
-
- sizeOf itbl
- = (sum . map (\f -> f itbl))
- [fieldSz ptrs, fieldSz nptrs, fieldSz srtlen, fieldSz tipe,
- fieldSz code0, fieldSz code1, fieldSz code2, fieldSz code3,
- fieldSz code4, fieldSz code5, fieldSz code6, fieldSz code7]
-
- alignment itbl
- = (sum . map (\f -> f itbl))
- [fieldAl ptrs, fieldAl nptrs, fieldAl srtlen, fieldAl tipe,
- fieldAl code0, fieldAl code1, fieldAl code2, fieldAl code3,
- fieldAl code4, fieldAl code5, fieldAl code6, fieldAl code7]
-
- poke a0 itbl
- = do a1 <- store (ptrs itbl) (castPtr a0)
- a2 <- store (nptrs itbl) a1
- a3 <- store (tipe itbl) a2
- a4 <- store (srtlen itbl) a3
- a5 <- store (code0 itbl) a4
- a6 <- store (code1 itbl) a5
- a7 <- store (code2 itbl) a6
- a8 <- store (code3 itbl) a7
- a9 <- store (code4 itbl) a8
- aA <- store (code5 itbl) a9
- aB <- store (code6 itbl) aA
- aC <- store (code7 itbl) aB
- return ()
-
- peek a0
- = do (a1,ptrs) <- load (castPtr a0)
- (a2,nptrs) <- load a1
- (a3,tipe) <- load a2
- (a4,srtlen) <- load a3
- (a5,code0) <- load a4
- (a6,code1) <- load a5
- (a7,code2) <- load a6
- (a8,code3) <- load a7
- (a9,code4) <- load a8
- (aA,code5) <- load a9
- (aB,code6) <- load aA
- (aC,code7) <- load aB
- return StgInfoTable { ptrs = ptrs, nptrs = nptrs,
- srtlen = srtlen, tipe = tipe,
- code0 = code0, code1 = code1, code2 = code2,
- code3 = code3, code4 = code4, code5 = code5,
- code6 = code6, code7 = code7 }
-
-fieldSz :: (Storable a, Storable b) => (a -> b) -> a -> Int
-fieldSz sel x = sizeOf (sel x)
-
-fieldAl :: (Storable a, Storable b) => (a -> b) -> a -> Int
-fieldAl sel x = alignment (sel x)
-
-store :: Storable a => a -> Ptr a -> IO (Ptr b)
-store x addr = do poke addr x
- return (castPtr (addr `plusPtr` sizeOf x))
-
-load :: Storable a => Ptr a -> IO (Ptr b, a)
-load addr = do x <- peek addr
- return (castPtr (addr `plusPtr` sizeOf x), x)
+returnBc :: a -> BcM a
+returnBc result = BcM $ \st -> (return (st, result))
-\end{code}
+instance Monad BcM where
+ (>>=) = thenBc
+ (>>) = thenBc_
+ return = returnBc
-%************************************************************************
-%* *
-\subsection{Connect to actual values for bytecode opcodes}
-%* *
-%************************************************************************
+emitBc :: ([Ptr ()] -> ProtoBCO Name) -> BcM (ProtoBCO Name)
+emitBc bco
+ = BcM $ \st -> return (st{malloced=[]}, bco (malloced st))
-\begin{code}
+recordMallocBc :: Ptr a -> BcM ()
+recordMallocBc a
+ = BcM $ \st -> return (st{malloced = castPtr a : malloced st}, ())
-#include "Bytecodes.h"
-
-i_ARGCHECK = (bci_ARGCHECK :: Int)
-i_PUSH_L = (bci_PUSH_L :: Int)
-i_PUSH_LL = (bci_PUSH_LL :: Int)
-i_PUSH_LLL = (bci_PUSH_LLL :: Int)
-i_PUSH_G = (bci_PUSH_G :: Int)
-i_PUSH_AS = (bci_PUSH_AS :: Int)
-i_PUSH_UBX = (bci_PUSH_UBX :: Int)
-i_PUSH_TAG = (bci_PUSH_TAG :: Int)
-i_SLIDE = (bci_SLIDE :: Int)
-i_ALLOC = (bci_ALLOC :: Int)
-i_MKAP = (bci_MKAP :: Int)
-i_UNPACK = (bci_UNPACK :: Int)
-i_UPK_TAG = (bci_UPK_TAG :: Int)
-i_PACK = (bci_PACK :: Int)
-i_TESTLT_I = (bci_TESTLT_I :: Int)
-i_TESTEQ_I = (bci_TESTEQ_I :: Int)
-i_TESTLT_F = (bci_TESTLT_F :: Int)
-i_TESTEQ_F = (bci_TESTEQ_F :: Int)
-i_TESTLT_D = (bci_TESTLT_D :: Int)
-i_TESTEQ_D = (bci_TESTEQ_D :: Int)
-i_TESTLT_P = (bci_TESTLT_P :: Int)
-i_TESTEQ_P = (bci_TESTEQ_P :: Int)
-i_CASEFAIL = (bci_CASEFAIL :: Int)
-i_ENTER = (bci_ENTER :: Int)
-i_RETURN = (bci_RETURN :: Int)
+getLabelBc :: BcM Int
+getLabelBc
+ = BcM $ \st -> return (st{nextlabel = 1 + nextlabel st}, nextlabel st)
+getLabelsBc :: Int -> BcM [Int]
+getLabelsBc n
+ = BcM $ \st -> let ctr = nextlabel st
+ in return (st{nextlabel = ctr+n}, [ctr .. ctr+n-1])
\end{code}
projects / ghc-hetmet.git / blobdiff