%
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
-% $Id: ClosureInfo.lhs,v 1.51 2002/01/02 12:32:19 simonmar Exp $
+% $Id: ClosureInfo.lhs,v 1.61 2003/11/17 14:23:31 simonmar Exp $
%
\section[ClosureInfo]{Data structures which describe closures}
\begin{code}
module ClosureInfo (
ClosureInfo, LambdaFormInfo, SMRep, -- all abstract
- StandardFormInfo,
+ StandardFormInfo, ArgDescr(..),
- EntryConvention(..),
+ CallingConvention(..),
mkClosureLFInfo, mkConLFInfo, mkSelectorLFInfo,
mkApLFInfo, mkLFImported, mkLFArgument, mkLFLetNoEscape,
- UpdateFlag,
closureSize, closureNonHdrSize,
closureGoodStuffSize, closurePtrsSize,
slopSize,
- layOutDynClosure, layOutDynConstr, layOutStaticClosure,
- layOutStaticNoFVClosure, layOutStaticConstr,
+ layOutDynClosure, layOutStaticClosure, layOutStaticNoFVClosure,
+ layOutDynConstr, layOutStaticConstr,
mkVirtHeapOffsets, mkStaticClosure,
nodeMustPointToIt, getEntryConvention,
blackHoleOnEntry,
staticClosureRequired,
- slowFunEntryCodeRequired, funInfoTableRequired,
- closureName, infoTableLabelFromCI, fastLabelFromCI,
+ closureName, infoTableLabelFromCI,
closureLabelFromCI, closureSRT,
entryLabelFromCI,
closureLFInfo, closureSMRep, closureUpdReqd,
closureSingleEntry, closureReEntrant, closureSemiTag,
- isStandardFormThunk,
- GenStgArg,
+ closureFunInfo, isStandardFormThunk,
isToplevClosure,
closureTypeDescr, -- profiling
isStaticClosure,
allocProfilingMsg,
cafBlackHoleClosureInfo, seCafBlackHoleClosureInfo,
- maybeSelectorInfo,
staticClosureNeedsLink,
+
+ mkInfoTable, mkRetInfoTable, mkVecInfoTable,
) where
+#include "../includes/config.h"
+#include "../includes/MachDeps.h"
#include "HsVersions.h"
import AbsCSyn
import StgSyn
import CgMonad
-import Constants ( mIN_UPD_SIZE, mIN_SIZE_NonUpdHeapObject,
- mAX_SPEC_FUN_SIZE, mAX_SPEC_THUNK_SIZE, mAX_SPEC_CONSTR_SIZE )
+import Constants ( mIN_UPD_SIZE, mIN_SIZE_NonUpdHeapObject )
import CgRetConv ( assignRegs )
-import CLabel ( CLabel, mkStdEntryLabel, mkFastEntryLabel,
- mkInfoTableLabel,
- mkConInfoTableLabel,
- mkCAFBlackHoleInfoTableLabel,
- mkSECAFBlackHoleInfoTableLabel,
- mkStaticInfoTableLabel, mkStaticConEntryLabel,
- mkConEntryLabel, mkClosureLabel,
- mkSelectorInfoLabel, mkSelectorEntryLabel,
- mkApInfoTableLabel, mkApEntryLabel,
- mkReturnPtLabel
- )
+import CLabel
import CmdLineOpts ( opt_SccProfilingOn, opt_OmitBlackHoling,
opt_Parallel, opt_DoTickyProfiling,
- opt_SMP )
-import Id ( Id, idType, idArity )
+ opt_SMP, opt_Unregisterised )
+import Id ( Id, idType, idArity, idName, idPrimRep )
import DataCon ( DataCon, dataConTag, fIRST_TAG, dataConTyCon,
isNullaryDataCon, dataConName
)
-import TyCon ( isBoxedTupleTyCon )
-import Name ( Name, nameUnique, getOccName )
+import Name ( Name, nameUnique, getOccName, getName, getOccString )
import OccName ( occNameUserString )
-import PprType ( getTyDescription )
-import PrimRep ( getPrimRepSize, separateByPtrFollowness, PrimRep )
+import PrimRep
import SMRep -- all of it
-import Type ( isUnLiftedType, Type )
-import BasicTypes ( TopLevelFlag(..), isNotTopLevel, isTopLevel )
+import Type ( isUnLiftedType, Type, repType, splitTyConApp_maybe )
+import TcType ( tcSplitSigmaTy )
+import TyCon ( isFunTyCon )
+import BasicTypes ( TopLevelFlag(..), isNotTopLevel, isTopLevel, ipNameName )
import Util ( mapAccumL, listLengthCmp, lengthIs )
+import FastString
import Outputable
+import Literal
+import Constants
+import Bitmap
+
+import Maybe ( isJust )
+import DATA_BITS
+
+import TypeRep -- TEMP
\end{code}
%************************************************************************
%* *
%************************************************************************
-The ``wrapper'' data type for closure information:
+Information about a closure, from the code generator's point of view.
+
+A ClosureInfo decribes the info pointer of a closure. It has
+enough information
+ a) to construct the info table itself
+ b) to allocate a closure containing that info pointer (i.e.
+ it knows the info table label)
+
+We make a ClosureInfo for
+ - each let binding (both top level and not)
+ - each data constructor (for its shared static and
+ dynamic info tables)
\begin{code}
data ClosureInfo
- = MkClosureInfo {
- closureName :: Name, -- The thing bound to this closure
- closureLFInfo :: LambdaFormInfo, -- Info derivable from the *source*
- closureSMRep :: SMRep, -- representation used by storage manager
- closureSRT :: C_SRT -- What SRT applies to this closure
+ = ClosureInfo {
+ closureName :: !Name, -- The thing bound to this closure
+ closureLFInfo :: !LambdaFormInfo, -- NOTE: not an LFCon (see below)
+ closureSMRep :: !SMRep, -- representation used by storage mgr
+ closureSRT :: !C_SRT, -- What SRT applies to this closure
+ closureType :: !Type, -- Type of closure (ToDo: remove)
+ closureDescr :: !String -- closure description (for profiling)
+ }
+
+ -- constructor closures don't have a unique info table label (they use
+ -- the constructor's info table), and they don't have an SRT.
+ | ConInfo {
+ closureCon :: !DataCon,
+ closureSMRep :: !SMRep
}
\end{code}
%* *
%************************************************************************
+Information about an identifier, from the code generator's point of
+view. Every identifier is bound to a LambdaFormInfo in the
+environment, which gives the code generator enough info to be able to
+tail call or return that identifier.
+
+Note that a closure is usually bound to an identifier, so a
+ClosureInfo contains a LambdaFormInfo.
+
\begin{code}
data LambdaFormInfo
- = LFReEntrant -- Reentrant closure; used for PAPs too
- Type -- Type of closure (ToDo: remove)
+ = LFReEntrant -- Reentrant closure (a function)
TopLevelFlag -- True if top level
!Int -- Arity
!Bool -- True <=> no fvs
+ ArgDescr -- Argument descriptor (should reall be in ClosureInfo)
| LFCon -- Constructor
DataCon -- The constructor
- Bool -- True <=> zero arity
-
- | LFTuple -- Tuples
- DataCon -- The tuple constructor
- Bool -- True <=> zero arity
| LFThunk -- Thunk (zero arity)
- Type -- Type of the thunk (ToDo: remove)
TopLevelFlag
!Bool -- True <=> no free vars
- Bool -- True <=> updatable (i.e., *not* single-entry)
+ !Bool -- True <=> updatable (i.e., *not* single-entry)
StandardFormInfo
+ !Bool -- True <=> *might* be a function type
- | LFArgument -- Used for function arguments. We know nothing about
- -- this closure. Treat like updatable "LFThunk"...
-
- | LFImported -- Used for imported things. We know nothing about this
- -- closure. Treat like updatable "LFThunk"...
+ | LFUnknown -- Used for function arguments and imported things.
+ -- We know nothing about this closure. Treat like
+ -- updatable "LFThunk"...
-- Imported things which we do know something about use
-- one of the other LF constructors (eg LFReEntrant for
-- known functions)
+ !Bool -- True <=> *might* be a function type
| LFLetNoEscape -- See LetNoEscape module for precise description of
-- these "lets".
- Int -- arity;
+ !Int -- arity;
| LFBlackHole -- Used for the closures allocated to hold the result
-- of a CAF. We want the target of the update frame to
-> LambdaFormInfo
mkClosureLFInfo bndr top fvs upd_flag args@(_:_) -- Non-empty args
- = LFReEntrant (idType bndr) top (length args) (null fvs)
-
-mkClosureLFInfo bndr top fvs ReEntrant []
- = LFReEntrant (idType bndr) top 0 (null fvs)
+ = LFReEntrant top (length args) (null fvs) (mkArgDescr (getName bndr) args)
mkClosureLFInfo bndr top fvs upd_flag []
-#ifdef DEBUG
- | isUnLiftedType ty = pprPanic "mkClosureLFInfo" (ppr bndr <+> ppr ty)
-#endif
- | otherwise
- = LFThunk ty top (null fvs) (isUpdatable upd_flag) NonStandardThunk
+ = ASSERT( not updatable || not (isUnLiftedType id_ty) )
+ LFThunk top (null fvs) updatable NonStandardThunk
+ (might_be_a_function id_ty)
where
- ty = idType bndr
+ updatable = isUpdatable upd_flag
+ id_ty = idType bndr
+
+might_be_a_function :: Type -> Bool
+might_be_a_function ty
+ | Just (tc,_) <- splitTyConApp_maybe (repType ty),
+ not (isFunTyCon tc) = False
+ | otherwise = True
\end{code}
@mkConLFInfo@ is similar, for constructors.
\begin{code}
mkConLFInfo :: DataCon -> LambdaFormInfo
+mkConLFInfo con = LFCon con
-mkConLFInfo con
- = -- the isNullaryDataCon will do this: ASSERT(isDataCon con)
- (if isBoxedTupleTyCon (dataConTyCon con) then LFTuple else LFCon)
- con (isNullaryDataCon con)
-
-mkSelectorLFInfo rhs_ty offset updatable
- = LFThunk rhs_ty NotTopLevel False updatable (SelectorThunk offset)
+mkSelectorLFInfo id offset updatable
+ = LFThunk NotTopLevel False updatable (SelectorThunk offset)
+ (might_be_a_function (idType id))
-mkApLFInfo rhs_ty upd_flag arity
- = LFThunk rhs_ty NotTopLevel (arity == 0)
- (isUpdatable upd_flag) (ApThunk arity)
+mkApLFInfo id upd_flag arity
+ = LFThunk NotTopLevel (arity == 0) (isUpdatable upd_flag) (ApThunk arity)
+ (might_be_a_function (idType id))
\end{code}
Miscellaneous LF-infos.
\begin{code}
-mkLFArgument = LFArgument
+mkLFArgument id = LFUnknown (might_be_a_function (idType id))
+
mkLFLetNoEscape = LFLetNoEscape
mkLFImported :: Id -> LambdaFormInfo
mkLFImported id
= case idArity id of
- n | n > 0 -> LFReEntrant (idType id) TopLevel n True -- n > 0
- other -> LFImported -- Not sure of exact arity
+ n | n > 0 -> LFReEntrant TopLevel n True (panic "arg_descr") -- n > 0
+ other -> mkLFArgument id -- Not sure of exact arity
\end{code}
%************************************************************************
closureNonHdrSize cl_info
= tot_wds + computeSlopSize tot_wds
(closureSMRep cl_info)
- (closureUpdReqd cl_info)
+ (closureNeedsUpdSpace cl_info)
where
tot_wds = closureGoodStuffSize cl_info
+-- we leave space for an update if either (a) the closure is updatable
+-- or (b) it is a static thunk. This is because a static thunk needs
+-- a static link field in a predictable place (after the slop), regardless
+-- of whether it is updatable or not.
+closureNeedsUpdSpace (ClosureInfo { closureLFInfo =
+ LFThunk TopLevel _ _ _ _ }) = True
+closureNeedsUpdSpace cl_info = closureUpdReqd cl_info
+
slopSize :: ClosureInfo -> Int
slopSize cl_info
= computeSlopSize (closureGoodStuffSize cl_info)
(closureSMRep cl_info)
- (closureUpdReqd cl_info)
+ (closureNeedsUpdSpace cl_info)
closureGoodStuffSize :: ClosureInfo -> Int
closureGoodStuffSize cl_info
%************************************************************************
%* *
-\subsection[layOutDynClosure]{Lay out a dynamic closure}
+\subsection[layOutDynClosure]{Lay out a closure}
%* *
%************************************************************************
\begin{code}
layOutDynClosure, layOutStaticClosure
- :: Name -- STG identifier of this closure
+ :: Id -- STG identifier of this closure
+ -> (a -> PrimRep) -- how to get a PrimRep for the fields
+ -> [a] -- the "things" being layed out
+ -> LambdaFormInfo -- what sort of closure it is
+ -> C_SRT -- its SRT
+ -> String -- closure description
+ -> (ClosureInfo, -- info about the closure
+ [(a, VirtualHeapOffset)]) -- things w/ offsets pinned on them
+
+layOutDynClosure = layOutClosure False
+layOutStaticClosure = layOutClosure True
+
+layOutStaticNoFVClosure id lf_info srt_info descr
+ = fst (layOutClosure True id (panic "kind_fn") [] lf_info srt_info descr)
+
+layOutClosure
+ :: Bool -- True <=> static closure
+ -> Id -- STG identifier of this closure
-> (a -> PrimRep) -- how to get a PrimRep for the fields
-> [a] -- the "things" being layed out
-> LambdaFormInfo -- what sort of closure it is
- -> C_SRT
+ -> C_SRT -- its SRT
+ -> String -- closure description
-> (ClosureInfo, -- info about the closure
[(a, VirtualHeapOffset)]) -- things w/ offsets pinned on them
-layOutDynClosure name kind_fn things lf_info srt_info
- = (MkClosureInfo { closureName = name, closureLFInfo = lf_info,
- closureSMRep = sm_rep, closureSRT = srt_info },
+layOutClosure is_static id kind_fn things lf_info srt_info descr
+ = (ClosureInfo { closureName = name,
+ closureLFInfo = lf_info,
+ closureSMRep = sm_rep,
+ closureSRT = srt_info,
+ closureType = idType id,
+ closureDescr = descr },
things_w_offsets)
where
+ name = idName id
(tot_wds, -- #ptr_wds + #nonptr_wds
ptr_wds, -- #ptr_wds
things_w_offsets) = mkVirtHeapOffsets kind_fn things
- sm_rep = chooseDynSMRep lf_info tot_wds ptr_wds
-\end{code}
+ sm_rep = chooseSMRep is_static lf_info tot_wds ptr_wds
-Wrappers for when used with data constructors:
-\begin{code}
layOutDynConstr, layOutStaticConstr
- :: Name -- Of the closure
- -> DataCon
- -> (a -> PrimRep) -> [a]
- -> (ClosureInfo, [(a,VirtualHeapOffset)])
-
-layOutDynConstr name data_con kind_fn args
- = layOutDynClosure name kind_fn args (mkConLFInfo data_con) NoC_SRT
-
-layOutStaticConstr name data_con kind_fn things
- = layOutStaticClosure name kind_fn things (mkConLFInfo data_con) NoC_SRT
+ :: DataCon
+ -> (a -> PrimRep)
+ -> [a]
+ -> (ClosureInfo,
+ [(a,VirtualHeapOffset)])
+
+layOutDynConstr = layOutConstr False
+layOutStaticConstr = layOutConstr True
+
+layOutConstr is_static data_con kind_fn args
+ = (ConInfo { closureSMRep = sm_rep,
+ closureCon = data_con },
+ things_w_offsets)
+ where
+ (tot_wds, -- #ptr_wds + #nonptr_wds
+ ptr_wds, -- #ptr_wds
+ things_w_offsets) = mkVirtHeapOffsets kind_fn args
+ sm_rep = chooseSMRep is_static (mkConLFInfo data_con) tot_wds ptr_wds
\end{code}
%************************************************************************
%* *
-\subsection[layOutStaticClosure]{Lay out a static closure}
+\subsection[mkStaticClosure]{Make a static closure}
%* *
%************************************************************************
-layOutStaticClosure is only used for laying out static constructors at
-the moment.
-
-Static closures for functions are laid out using
-layOutStaticNoFVClosure.
+Make a static closure, adding on any extra padding needed for CAFs,
+and adding a static link field if necessary.
\begin{code}
-layOutStaticClosure name kind_fn things lf_info srt_info
- = (MkClosureInfo { closureName = name, closureLFInfo = lf_info,
- closureSMRep = rep, closureSRT = srt_info },
- things_w_offsets)
- where
- rep = GenericRep is_static ptr_wds (tot_wds - ptr_wds) closure_type
-
- (tot_wds, -- #ptr_wds + #nonptr_wds
- ptr_wds, -- #ptr_wds
- things_w_offsets) = mkVirtHeapOffsets kind_fn things
-
- -- constructors with no pointer fields will definitely be NOCAF things.
- -- this is a compromise until we can generate both kinds of constructor
- -- (a normal static kind and the NOCAF_STATIC kind).
- closure_type = getClosureType is_static tot_wds ptr_wds lf_info
- is_static = True
-
-layOutStaticNoFVClosure :: Name -> LambdaFormInfo -> C_SRT -> ClosureInfo
-layOutStaticNoFVClosure name lf_info srt_info
- = MkClosureInfo { closureName = name, closureLFInfo = lf_info,
- closureSMRep = rep, closureSRT = srt_info }
- where
- rep = GenericRep is_static 0 0 (getClosureType is_static 0 0 lf_info)
- is_static = True
-
-
--- make a static closure, adding on any extra padding needed for CAFs,
--- and adding a static link field if necessary.
-
-mkStaticClosure closure_info ccs fields cafrefs
+mkStaticClosure lbl cl_info ccs fields cafrefs
| opt_SccProfilingOn =
CStaticClosure
- closure_info
+ lbl
+ cl_info
(mkCCostCentreStack ccs)
all_fields
| otherwise =
CStaticClosure
- closure_info
+ lbl
+ cl_info
(panic "absent cc")
all_fields
where
all_fields = fields ++ padding_wds ++ static_link_field
- upd_reqd = closureUpdReqd closure_info
+ upd_reqd = closureUpdReqd cl_info
+ -- for the purposes of laying out the static closure, we consider all
+ -- thunks to be "updatable", so that the static link field is always
+ -- in the same place.
padding_wds
| not upd_reqd = []
| otherwise = replicate n (mkIntCLit 0) -- a bunch of 0s
-- save the closure's info pointer when we're reverting CAFs
-- (see comment in Storage.c)
static_link_field
- | upd_reqd || staticClosureNeedsLink closure_info = [static_link_value]
- | otherwise = []
+ | upd_reqd || staticClosureNeedsLink cl_info = [static_link_value]
+ | otherwise = []
-- for a static constructor which has NoCafRefs, we set the
-- static link field to a non-zero value so the garbage
%************************************************************************
\begin{code}
-chooseDynSMRep
- :: LambdaFormInfo
+chooseSMRep
+ :: Bool -- True <=> static closure
+ -> LambdaFormInfo
-> Int -> Int -- Tot wds, ptr wds
-> SMRep
-chooseDynSMRep lf_info tot_wds ptr_wds
+chooseSMRep is_static lf_info tot_wds ptr_wds
= let
- is_static = False
nonptr_wds = tot_wds - ptr_wds
closure_type = getClosureType is_static tot_wds ptr_wds lf_info
in
getClosureType :: Bool -> Int -> Int -> LambdaFormInfo -> ClosureType
getClosureType is_static tot_wds ptr_wds lf_info
= case lf_info of
- LFCon con zero_arity
- | is_static && ptr_wds == 0 -> CONSTR_NOCAF
- | specialised_rep mAX_SPEC_CONSTR_SIZE -> CONSTR_p_n
- | otherwise -> CONSTR
-
- LFTuple _ zero_arity
- | is_static && ptr_wds == 0 -> CONSTR_NOCAF
- | specialised_rep mAX_SPEC_CONSTR_SIZE -> CONSTR_p_n
- | otherwise -> CONSTR
-
- LFReEntrant _ _ _ _
- | specialised_rep mAX_SPEC_FUN_SIZE -> FUN_p_n
- | otherwise -> FUN
-
- LFThunk _ _ _ _ (SelectorThunk _) -> THUNK_SELECTOR
-
- LFThunk _ _ _ _ _
- | specialised_rep mAX_SPEC_THUNK_SIZE -> THUNK_p_n
- | otherwise -> THUNK
-
+ LFCon con | is_static && ptr_wds == 0 -> ConstrNoCaf
+ | otherwise -> Constr
+ LFReEntrant _ _ _ _ -> Fun
+ LFThunk _ _ _ (SelectorThunk _) _ -> ThunkSelector
+ LFThunk _ _ _ _ _ -> Thunk
_ -> panic "getClosureType"
- where
- specialised_rep max_size = not is_static
- && tot_wds > 0
- && tot_wds <= max_size
\end{code}
%************************************************************************
nodeMustPointToIt lf_info
= case lf_info of
- LFReEntrant ty top arity no_fvs -> returnFC (
+ LFReEntrant top _ no_fvs _ -> returnFC (
not no_fvs || -- Certainly if it has fvs we need to point to it
isNotTopLevel top
-- If it is not top level we will point to it
-- the not top case above ensures this is ok.
)
- LFCon _ zero_arity -> returnFC True
- LFTuple _ zero_arity -> returnFC True
+ LFCon _ -> returnFC True
-- Strictly speaking, the above two don't need Node to point
-- to it if the arity = 0. But this is a *really* unlikely
-- having Node point to the result of an update. SLPJ
-- 27/11/92.
- LFThunk _ _ no_fvs updatable NonStandardThunk
+ LFThunk _ no_fvs updatable NonStandardThunk _
-> returnFC (updatable || not no_fvs || opt_SccProfilingOn)
-- For the non-updatable (single-entry case):
-- or profiling (in which case we need to recover the cost centre
-- from inside it)
- LFThunk _ _ no_fvs updatable some_standard_form_thunk
+ LFThunk _ no_fvs updatable some_standard_form_thunk _
-> returnFC True
-- Node must point to any standard-form thunk.
- LFArgument -> returnFC True
- LFImported -> returnFC True
+ LFUnknown _ -> returnFC True
LFBlackHole _ -> returnFC True
-- BH entry may require Node to point
(rather than directly) to catch double-entry.
\begin{code}
-data EntryConvention
- = ViaNode -- The "normal" convention
+data CallingConvention
+ = EnterIt -- no args, not a function
+
+ | JumpToIt CLabel -- no args, not a function, but we
+ -- know what its entry code is
+
+ | ReturnIt -- it's a function, but we have
+ -- zero args to apply to it, so just
+ -- return it.
- | StdEntry CLabel -- Jump to this code, with args on stack
+ | SlowCall -- Unknown fun, or known fun with
+ -- too few args.
| DirectEntry -- Jump directly, with args in regs
CLabel -- The code label
getEntryConvention :: Name -- Function being applied
-> LambdaFormInfo -- Its info
-> [PrimRep] -- Available arguments
- -> FCode EntryConvention
+ -> FCode CallingConvention
getEntryConvention name lf_info arg_kinds
= nodeMustPointToIt lf_info `thenFC` \ node_points ->
-- if we're parallel, then we must always enter via node. The reason
-- is that the closure may have been fetched since we allocated it.
- if (node_points && opt_Parallel) then ViaNode else
+ if (node_points && opt_Parallel) then EnterIt else
-- Commented out by SDM after futher thoughts:
-- - the only closure type that can be blackholed is a thunk
case lf_info of
- LFReEntrant _ _ arity _ ->
- if arity == 0 || (listLengthCmp arg_kinds arity == LT) then
- StdEntry (mkStdEntryLabel name)
+ LFReEntrant _ arity _ _ ->
+ if null arg_kinds then
+ if arity == 0 then
+ EnterIt -- a non-updatable thunk
+ else
+ ReturnIt -- no args at all
+ else if listLengthCmp arg_kinds arity == LT then
+ SlowCall -- not enough args
else
- DirectEntry (mkFastEntryLabel name arity) arity arg_regs
+ DirectEntry (mkEntryLabel name) arity arg_regs
where
- (arg_regs, _) = assignRegs live_regs (take arity arg_kinds)
- live_regs = if node_points then [node] else []
+ (arg_regs, _) = assignRegs [node] (take arity arg_kinds)
+ -- we don't use node to pass args now (SDM)
- LFCon con True{-zero_arity-}
+ LFCon con
+ | isNullaryDataCon con
-- a real constructor. Don't bother entering it, just jump
-- to the constructor entry code directly.
-> --false:ASSERT (null arg_kinds)
-- Should have no args (meaning what?)
- StdEntry (mkStaticConEntryLabel (dataConName con))
+ JumpToIt (mkStaticConEntryLabel (dataConName con))
- LFCon con False{-non-zero_arity-}
+ | otherwise {- not nullary -}
-> --false:ASSERT (null arg_kinds)
-- Should have no args (meaning what?)
- StdEntry (mkConEntryLabel (dataConName con))
+ JumpToIt (mkConEntryLabel (dataConName con))
- LFTuple tup zero_arity
- -> --false:ASSERT (null arg_kinds)
- -- Should have no args (meaning what?)
- StdEntry (mkConEntryLabel (dataConName tup))
-
- LFThunk _ _ _ updatable std_form_info
- -> if updatable || opt_DoTickyProfiling -- to catch double entry
+ LFThunk _ _ updatable std_form_info is_fun
+ -- must always "call" a function-typed thing, cannot just enter it
+ | is_fun -> SlowCall
+ | updatable || opt_DoTickyProfiling -- to catch double entry
|| opt_SMP -- always enter via node on SMP, since the
-- thunk might have been blackholed in the
-- meantime.
- then ViaNode
- else StdEntry (thunkEntryLabel name std_form_info updatable)
+ -> ASSERT(null arg_kinds) EnterIt
+ | otherwise
+ -> ASSERT(null arg_kinds)
+ JumpToIt (thunkEntryLabel name std_form_info updatable)
+
+ LFUnknown True -> SlowCall -- might be a function
+ LFUnknown False -> ASSERT2 (null arg_kinds, ppr name <+> ppr arg_kinds) EnterIt -- not a function
- LFArgument -> ViaNode
- LFImported -> ViaNode
- LFBlackHole _ -> ViaNode -- Presumably the black hole has by now
- -- been updated, but we don't know with
- -- what, so we enter via Node
+ LFBlackHole _ -> SlowCall -- Presumably the black hole has by now
+ -- been updated, but we don't know with
+ -- what, so we slow call it
LFLetNoEscape 0
- -> StdEntry (mkReturnPtLabel (nameUnique name))
+ -> JumpToIt (mkReturnPtLabel (nameUnique name))
LFLetNoEscape arity
-> if (not (arg_kinds `lengthIs` arity)) then pprPanic "let-no-escape: " (ppr name <+> ppr arity) else
-- Single-entry ones have no fvs to plug, and we trust they don't form part
-- of a loop.
-blackHoleOnEntry cl_info
- | isStaticRep (closureSMRep cl_info)
+blackHoleOnEntry ConInfo{} = False
+blackHoleOnEntry (ClosureInfo { closureLFInfo = lf_info, closureSMRep = rep })
+ | isStaticRep rep
= False -- Never black-hole a static closure
| otherwise
- = case closureLFInfo cl_info of
+ = case lf_info of
LFReEntrant _ _ _ _ -> False
LFLetNoEscape _ -> False
- LFThunk _ _ no_fvs updatable _
+ LFThunk _ no_fvs updatable _ _
-> if updatable
then not opt_OmitBlackHoling
else opt_DoTickyProfiling || not no_fvs
isStandardFormThunk :: LambdaFormInfo -> Bool
-isStandardFormThunk (LFThunk _ _ _ _ (SelectorThunk _)) = True
-isStandardFormThunk (LFThunk _ _ _ _ (ApThunk _)) = True
+isStandardFormThunk (LFThunk _ _ _ (SelectorThunk _) _) = True
+isStandardFormThunk (LFThunk _ _ _ (ApThunk _) _) = True
isStandardFormThunk other_lf_info = False
-maybeSelectorInfo (MkClosureInfo { closureLFInfo = LFThunk _ _ _ _ (SelectorThunk offset) })
- = Just offset
-maybeSelectorInfo _ = Nothing
\end{code}
-----------------------------------------------------------------------------
-- b) it's a constructor with one or more pointer fields
-- In case (b), the constructor's fields themselves play the role
-- of the SRT.
-staticClosureNeedsLink (MkClosureInfo { closureName = name,
- closureSRT = srt,
- closureLFInfo = lf_info,
- closureSMRep = sm_rep })
- = needsSRT srt || (constr_with_fields && not_nocaf_constr)
+staticClosureNeedsLink (ClosureInfo { closureSRT = srt })
+ = needsSRT srt
+staticClosureNeedsLink (ConInfo { closureSMRep = sm_rep, closureCon = con })
+ = not (isNullaryDataCon con) && not_nocaf_constr
where
not_nocaf_constr =
case sm_rep of
- GenericRep _ _ _ CONSTR_NOCAF -> False
- _other -> True
-
- constr_with_fields =
- case lf_info of
- LFThunk _ _ _ _ _ -> False
- LFReEntrant _ _ _ _ -> False
- LFCon _ is_nullary -> not is_nullary
- LFTuple _ is_nullary -> not is_nullary
- _other -> pprPanic "staticClosureNeedsLink" (ppr name)
+ GenericRep _ _ _ ConstrNoCaf -> False
+ _other -> True
\end{code}
Avoiding generating entries and info tables
-> LambdaFormInfo
-> Bool
staticClosureRequired binder bndr_info
- (LFReEntrant _ top_level _ _) -- It's a function
+ (LFReEntrant top_level _ _ _) -- It's a function
= ASSERT( isTopLevel top_level )
-- Assumption: it's a top-level, no-free-var binding
not (satCallsOnly bndr_info)
staticClosureRequired binder other_binder_info other_lf_info = True
-
-slowFunEntryCodeRequired -- Assumption: it's a function, not a thunk.
- :: Name
- -> StgBinderInfo
- -> EntryConvention
- -> Bool
-slowFunEntryCodeRequired binder bndr_info entry_conv
- = not (satCallsOnly bndr_info)
- || (case entry_conv of { DirectEntry _ _ _ -> False; other -> True })
- {- The last case deals with the parallel world; a function usually
- as a DirectEntry convention, but if it doesn't we must generate slow-entry code -}
-
-funInfoTableRequired
- :: Name
- -> StgBinderInfo
- -> LambdaFormInfo
- -> Bool
-funInfoTableRequired binder bndr_info (LFReEntrant _ top_level _ _)
- = isNotTopLevel top_level
- || not (satCallsOnly bndr_info)
-
-funInfoTableRequired other_binder_info binder other_lf_info = True
\end{code}
%************************************************************************
isStaticClosure cl_info = isStaticRep (closureSMRep cl_info)
closureUpdReqd :: ClosureInfo -> Bool
-closureUpdReqd (MkClosureInfo { closureLFInfo = LFThunk _ _ _ upd _ }) = upd
-closureUpdReqd (MkClosureInfo { closureLFInfo = LFBlackHole _ }) = True
+closureUpdReqd (ClosureInfo { closureLFInfo = LFThunk _ _ upd _ _ }) = upd
+closureUpdReqd (ClosureInfo { closureLFInfo = LFBlackHole _ }) = True
-- Black-hole closures are allocated to receive the results of an
-- alg case with a named default... so they need to be updated.
closureUpdReqd other_closure = False
closureSingleEntry :: ClosureInfo -> Bool
-closureSingleEntry (MkClosureInfo { closureLFInfo = LFThunk _ _ _ upd _ }) = not upd
+closureSingleEntry (ClosureInfo { closureLFInfo = LFThunk _ _ upd _ _}) = not upd
closureSingleEntry other_closure = False
closureReEntrant :: ClosureInfo -> Bool
-closureReEntrant (MkClosureInfo { closureLFInfo = LFReEntrant _ _ _ _ }) = True
+closureReEntrant (ClosureInfo { closureLFInfo = LFReEntrant _ _ _ _ }) = True
closureReEntrant other_closure = False
-\end{code}
-\begin{code}
closureSemiTag :: ClosureInfo -> Maybe Int
-closureSemiTag (MkClosureInfo { closureLFInfo = lf_info })
- = case lf_info of
- LFCon data_con _ -> Just (dataConTag data_con - fIRST_TAG)
- LFTuple _ _ -> Just 0
- _ -> Nothing
+closureSemiTag (ConInfo { closureCon = data_con })
+ = Just (dataConTag data_con - fIRST_TAG)
+closureSemiTag _ = Nothing
+
+closureFunInfo :: ClosureInfo -> Maybe (Int, ArgDescr)
+closureFunInfo (ClosureInfo { closureLFInfo = LFReEntrant _ arity _ arg_desc})
+ = Just (arity, arg_desc)
+closureFunInfo _
+ = Nothing
\end{code}
\begin{code}
isToplevClosure :: ClosureInfo -> Bool
-
-isToplevClosure (MkClosureInfo { closureLFInfo = lf_info })
+isToplevClosure (ClosureInfo { closureLFInfo = lf_info })
= case lf_info of
- LFReEntrant _ TopLevel _ _ -> True
- LFThunk _ TopLevel _ _ _ -> True
+ LFReEntrant TopLevel _ _ _ -> True
+ LFThunk TopLevel _ _ _ _ -> True
other -> False
+isToplevClosure _ = False
\end{code}
Label generation.
\begin{code}
-fastLabelFromCI :: ClosureInfo -> CLabel
-fastLabelFromCI (MkClosureInfo { closureName = name, closureLFInfo = LFReEntrant _ _ arity _ })
- = mkFastEntryLabel name arity
-
-fastLabelFromCI cl_info
- = pprPanic "fastLabelFromCI" (ppr (closureName cl_info))
-
infoTableLabelFromCI :: ClosureInfo -> CLabel
-infoTableLabelFromCI (MkClosureInfo { closureName = id, closureLFInfo = lf_info, closureSMRep = rep })
+infoTableLabelFromCI (ClosureInfo { closureName = name,
+ closureLFInfo = lf_info,
+ closureSMRep = rep })
= case lf_info of
- LFCon con _ -> mkConInfoPtr con rep
- LFTuple tup _ -> mkConInfoPtr tup rep
-
LFBlackHole info -> info
- LFThunk _ _ _ upd_flag (SelectorThunk offset) ->
+ LFThunk _ _ upd_flag (SelectorThunk offset) _ ->
mkSelectorInfoLabel upd_flag offset
- LFThunk _ _ _ upd_flag (ApThunk arity) ->
+ LFThunk _ _ upd_flag (ApThunk arity) _ ->
mkApInfoTableLabel upd_flag arity
- other -> {-NO: if isStaticRep rep
- then mkStaticInfoTableLabel id
- else -} mkInfoTableLabel id
+ LFThunk{} -> mkInfoTableLabel name
+
+ LFReEntrant _ _ _ (ArgGen _ _) -> mkInfoTableLabel name
+ LFReEntrant _ _ _ _ -> mkInfoTableLabel name
+
+ other -> panic "infoTableLabelFromCI"
+
+infoTableLabelFromCI (ConInfo { closureCon = con, closureSMRep = rep })
+ = mkConInfoPtr con rep
+
mkConInfoPtr :: DataCon -> SMRep -> CLabel
mkConInfoPtr con rep
| isStaticRep rep = mkStaticConEntryLabel (dataConName con)
| otherwise = mkConEntryLabel (dataConName con)
-closureLabelFromCI cl_info = mkClosureLabel (closureName cl_info)
+closureLabelFromCI (ClosureInfo { closureName = nm }) = mkClosureLabel nm
+closureLabelFromCI _ = panic "closureLabelFromCI"
entryLabelFromCI :: ClosureInfo -> CLabel
-entryLabelFromCI (MkClosureInfo { closureName = id, closureLFInfo = lf_info, closureSMRep = rep })
+entryLabelFromCI (ClosureInfo { closureName = id,
+ closureLFInfo = lf_info,
+ closureSMRep = rep })
= case lf_info of
- LFThunk _ _ _ upd_flag std_form_info -> thunkEntryLabel id std_form_info upd_flag
- LFCon con _ -> mkConEntryPtr con rep
- LFTuple tup _ -> mkConEntryPtr tup rep
- other -> mkStdEntryLabel id
+ LFThunk _ _ upd_flag std_form_info _ ->
+ thunkEntryLabel id std_form_info upd_flag
+ other -> mkEntryLabel id
+
+entryLabelFromCI (ConInfo { closureCon = con, closureSMRep = rep })
+ = mkConEntryPtr con rep
+
-- thunkEntryLabel is a local help function, not exported. It's used from both
-- entryLabelFromCI and getEntryConvention.
thunkEntryLabel thunk_id (SelectorThunk offset) upd_flag
= mkSelectorEntryLabel upd_flag offset
thunkEntryLabel thunk_id _ is_updatable
- = mkStdEntryLabel thunk_id
+ = mkEntryLabel thunk_id
\end{code}
\begin{code}
-allocProfilingMsg :: ClosureInfo -> FAST_STRING
-
-allocProfilingMsg cl_info
- = case closureLFInfo cl_info of
- LFReEntrant _ _ _ _ -> SLIT("TICK_ALLOC_FUN")
- LFCon _ _ -> SLIT("TICK_ALLOC_CON")
- LFTuple _ _ -> SLIT("TICK_ALLOC_CON")
- LFThunk _ _ _ True _ -> SLIT("TICK_ALLOC_UP_THK") -- updatable
- LFThunk _ _ _ False _ -> SLIT("TICK_ALLOC_SE_THK") -- nonupdatable
- LFBlackHole _ -> SLIT("TICK_ALLOC_BH")
- LFImported -> panic "TICK_ALLOC_IMP"
+allocProfilingMsg :: ClosureInfo -> FastString
+allocProfilingMsg ConInfo{} = FSLIT("TICK_ALLOC_CON")
+allocProfilingMsg ClosureInfo{ closureLFInfo = lf_info }
+ = case lf_info of
+ LFReEntrant _ _ _ _ -> FSLIT("TICK_ALLOC_FUN")
+ LFThunk _ _ True _ _ -> FSLIT("TICK_ALLOC_UP_THK") -- updatable
+ LFThunk _ _ False _ _ -> FSLIT("TICK_ALLOC_SE_THK") -- nonupdatable
+ LFBlackHole _ -> FSLIT("TICK_ALLOC_BH")
+ _ -> panic "allocProfilingMsg"
\end{code}
We need a black-hole closure info to pass to @allocDynClosure@ when we
is a black hole and not something else.
\begin{code}
-cafBlackHoleClosureInfo cl_info
- = MkClosureInfo { closureName = closureName cl_info,
- closureLFInfo = LFBlackHole mkCAFBlackHoleInfoTableLabel,
- closureSMRep = BlackHoleRep,
- closureSRT = NoC_SRT }
-
-seCafBlackHoleClosureInfo cl_info
- = MkClosureInfo { closureName = closureName cl_info,
- closureLFInfo = LFBlackHole mkSECAFBlackHoleInfoTableLabel,
- closureSMRep = BlackHoleRep,
- closureSRT = NoC_SRT }
+cafBlackHoleClosureInfo (ClosureInfo { closureName = nm,
+ closureType = ty })
+ = ClosureInfo { closureName = nm,
+ closureLFInfo = LFBlackHole mkCAFBlackHoleInfoTableLabel,
+ closureSMRep = BlackHoleRep,
+ closureSRT = NoC_SRT,
+ closureType = ty,
+ closureDescr = "" }
+cafBlackHoleClosureInfo _ = panic "cafBlackHoleClosureInfo"
+
+seCafBlackHoleClosureInfo (ClosureInfo { closureName = nm,
+ closureType = ty })
+ = ClosureInfo { closureName = nm,
+ closureLFInfo = LFBlackHole mkSECAFBlackHoleInfoTableLabel,
+ closureSMRep = BlackHoleRep,
+ closureSRT = NoC_SRT,
+ closureType = ty,
+ closureDescr = "" }
+seCafBlackHoleClosureInfo _ = panic "seCafBlackHoleClosureInfo"
\end{code}
%************************************************************************
\begin{code}
closureTypeDescr :: ClosureInfo -> String
-closureTypeDescr cl_info
- = case closureLFInfo cl_info of
- LFThunk ty _ _ _ _ -> getTyDescription ty
- LFReEntrant ty _ _ _ -> getTyDescription ty
- LFCon data_con _ -> occNameUserString (getOccName (dataConTyCon data_con))
- other -> showSDoc (ppr (closureName cl_info))
+closureTypeDescr (ClosureInfo { closureType = ty })
+ = getTyDescription ty
+closureTypeDescr (ConInfo { closureCon = data_con })
+ = occNameUserString (getOccName (dataConTyCon data_con))
+
+getTyDescription :: Type -> String
+getTyDescription ty
+ = case (tcSplitSigmaTy ty) of { (_, _, tau_ty) ->
+ case tau_ty of
+ TyVarTy _ -> "*"
+ AppTy fun _ -> getTyDescription fun
+ FunTy _ res -> '-' : '>' : fun_result res
+ NewTcApp tycon _ -> getOccString tycon
+ TyConApp tycon _ -> getOccString tycon
+ NoteTy (FTVNote _) ty -> getTyDescription ty
+ NoteTy (SynNote ty1) _ -> getTyDescription ty1
+ PredTy sty -> getPredTyDescription sty
+ ForAllTy _ ty -> getTyDescription ty
+ }
+ where
+ fun_result (FunTy _ res) = '>' : fun_result res
+ fun_result other = getTyDescription other
+
+getPredTyDescription (ClassP cl tys) = getOccString cl
+getPredTyDescription (IParam ip ty) = getOccString (ipNameName ip)
+\end{code}
+
+%************************************************************************
+%* *
+\subsection{Making argument bitmaps}
+%* *
+%************************************************************************
+
+\begin{code}
+-- bring in ARG_P, ARG_N, etc.
+#include "../includes/StgFun.h"
+
+data ArgDescr
+ = ArgSpec
+ !Int -- ARG_P, ARG_N, ...
+ | ArgGen
+ CLabel -- label for a slow-entry point
+ Liveness -- the arg bitmap: describes pointedness of arguments
+
+mkArgDescr :: Name -> [Id] -> ArgDescr
+mkArgDescr nm args = argDescr nm (filter nonVoidRep (map idPrimRep args))
+ where nonVoidRep VoidRep = False
+ nonVoidRep _ = True
+
+argDescr nm [PtrRep] = ArgSpec ARG_P
+argDescr nm [FloatRep] = ArgSpec ARG_F
+argDescr nm [DoubleRep] = ArgSpec ARG_D
+argDescr nm [r] | is64BitRep r = ArgSpec ARG_L
+argDescr nm [r] | isNonPtrRep r = ArgSpec ARG_N
+
+argDescr nm [r1,r2] | isNonPtrRep r1 && isNonPtrRep r2 = ArgSpec ARG_NN
+argDescr nm [r1,PtrRep] | isNonPtrRep r1 = ArgSpec ARG_NP
+argDescr nm [PtrRep,r1] | isNonPtrRep r1 = ArgSpec ARG_PN
+argDescr nm [PtrRep,PtrRep] = ArgSpec ARG_PP
+
+argDescr nm [r1,r2,r3] | isNonPtrRep r1 && isNonPtrRep r2 && isNonPtrRep r3 = ArgSpec ARG_NNN
+argDescr nm [r1,r2,PtrRep] | isNonPtrRep r1 && isNonPtrRep r2 = ArgSpec ARG_NNP
+argDescr nm [r1,PtrRep,r2] | isNonPtrRep r1 && isNonPtrRep r2 = ArgSpec ARG_NPN
+argDescr nm [r1,PtrRep,PtrRep] | isNonPtrRep r1 = ArgSpec ARG_NPP
+argDescr nm [PtrRep,r1,r2] | isNonPtrRep r1 && isNonPtrRep r2 = ArgSpec ARG_PNN
+argDescr nm [PtrRep,r1,PtrRep] | isNonPtrRep r1 = ArgSpec ARG_PNP
+argDescr nm [PtrRep,PtrRep,r1] | isNonPtrRep r1 = ArgSpec ARG_PPN
+argDescr nm [PtrRep,PtrRep,PtrRep] = ArgSpec ARG_PPP
+
+argDescr nm [PtrRep,PtrRep,PtrRep,PtrRep] = ArgSpec ARG_PPPP
+argDescr nm [PtrRep,PtrRep,PtrRep,PtrRep,PtrRep] = ArgSpec ARG_PPPPP
+argDescr nm [PtrRep,PtrRep,PtrRep,PtrRep,PtrRep,PtrRep] = ArgSpec ARG_PPPPPP
+
+argDescr name reps = ArgGen (mkSlowEntryLabel name) liveness
+ where bitmap = argBits reps
+ lbl = mkBitmapLabel name
+ liveness = Liveness lbl (length bitmap) (mkBitmap bitmap)
+
+argBits [] = []
+argBits (rep : args)
+ | isFollowableRep rep = False : argBits args
+ | otherwise = take (getPrimRepSize rep) (repeat True) ++ argBits args
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Generating info tables}
+%* *
+%************************************************************************
+
+Here we make a concrete info table, represented as a list of CAddrMode
+(it can't be simply a list of Word, because the SRT field is
+represented by a label+offset expression).
+
+\begin{code}
+mkInfoTable :: ClosureInfo -> [CAddrMode]
+mkInfoTable cl_info
+ | tablesNextToCode = extra_bits ++ std_info
+ | otherwise = std_info ++ extra_bits
+ where
+ std_info = mkStdInfoTable entry_amode
+ ty_descr_amode cl_descr_amode cl_type srt_len layout_amode
+
+ entry_amode = CLbl (entryLabelFromCI cl_info) CodePtrRep
+
+ closure_descr =
+ case cl_info of
+ ClosureInfo { closureDescr = descr } -> descr
+ ConInfo { closureCon = con } -> occNameUserString (getOccName con)
+
+ ty_descr_amode = CLit (MachStr (mkFastString (closureTypeDescr cl_info)))
+ cl_descr_amode = CLit (MachStr (mkFastString closure_descr))
+
+ cl_type = getSMRepClosureTypeInt (closureSMRep cl_info)
+
+ srt = closureSRT cl_info
+ needs_srt = needsSRT srt
+
+ semi_tag = closureSemiTag cl_info
+ is_con = isJust semi_tag
+
+ (srt_label,srt_len)
+ | Just tag <- semi_tag = (mkIntCLit 0, fromIntegral tag) -- constructor
+ | otherwise =
+ case srt of
+ NoC_SRT -> (mkIntCLit 0, 0)
+ C_SRT lbl off bitmap ->
+ (CAddr (CIndex (CLbl lbl DataPtrRep) (mkIntCLit off) WordRep),
+ bitmap)
+
+ ptrs = closurePtrsSize cl_info
+ nptrs = size - ptrs
+ size = closureNonHdrSize cl_info
+
+ layout_info :: StgWord
+#ifdef WORDS_BIGENDIAN
+ layout_info = (fromIntegral ptrs `shiftL` hALF_WORD) .|. fromIntegral nptrs
+#else
+ layout_info = (fromIntegral ptrs) .|. (fromIntegral nptrs `shiftL` hALF_WORD)
+#endif
+
+ layout_amode = mkWordCLit layout_info
+
+ extra_bits
+ | is_fun = fun_extra_bits
+ | is_con = []
+ | needs_srt = [srt_label]
+ | otherwise = []
+
+ maybe_fun_stuff = closureFunInfo cl_info
+ is_fun = isJust maybe_fun_stuff
+ (Just (arity, arg_descr)) = maybe_fun_stuff
+
+ fun_extra_bits
+ | tablesNextToCode = reg_fun_extra_bits
+ | otherwise = reverse reg_fun_extra_bits
+
+ reg_fun_extra_bits
+ | ArgGen slow_lbl liveness <- arg_descr
+ = [
+ CLbl slow_lbl CodePtrRep,
+ livenessToAddrMode liveness,
+ srt_label,
+ fun_amode
+ ]
+ | needs_srt = [srt_label, fun_amode]
+ | otherwise = [fun_amode]
+
+#ifdef WORDS_BIGENDIAN
+ fun_desc = (fromIntegral fun_type `shiftL` hALF_WORD) .|. fromIntegral arity
+#else
+ fun_desc = (fromIntegral fun_type) .|. (fromIntegral arity `shiftL` hALF_WORD)
+#endif
+
+ fun_amode = mkWordCLit fun_desc
+
+ fun_type = case arg_descr of
+ ArgSpec n -> n
+ ArgGen _ (Liveness _ size _)
+ | size <= mAX_SMALL_BITMAP_SIZE -> ARG_GEN
+ | otherwise -> ARG_GEN_BIG
+
+-- Return info tables come in two flavours: direct returns and
+-- vectored returns.
+
+mkRetInfoTable :: CLabel -> C_SRT -> Liveness -> [CAddrMode]
+mkRetInfoTable entry_lbl srt liveness
+ = mkBitmapInfoTable (CLbl entry_lbl CodePtrRep) srt liveness []
+
+mkVecInfoTable :: [CAddrMode] -> C_SRT -> Liveness -> [CAddrMode]
+mkVecInfoTable vector srt liveness
+ = mkBitmapInfoTable zero_amode srt liveness vector
+
+mkBitmapInfoTable
+ :: CAddrMode
+ -> C_SRT -> Liveness
+ -> [CAddrMode]
+ -> [CAddrMode]
+mkBitmapInfoTable entry_amode srt liveness vector
+ | tablesNextToCode = extra_bits ++ std_info
+ | otherwise = std_info ++ extra_bits
+ where
+ std_info = mkStdInfoTable entry_amode zero_amode zero_amode
+ cl_type srt_len liveness_amode
+
+ liveness_amode = livenessToAddrMode liveness
+
+ (srt_label,srt_len) =
+ case srt of
+ NoC_SRT -> (mkIntCLit 0, 0)
+ C_SRT lbl off bitmap ->
+ (CAddr (CIndex (CLbl lbl DataPtrRep) (mkIntCLit off) WordRep),
+ bitmap)
+
+ cl_type = case (null vector, isBigLiveness liveness) of
+ (True, True) -> rET_BIG
+ (True, False) -> rET_SMALL
+ (False, True) -> rET_VEC_BIG
+ (False, False) -> rET_VEC_SMALL
+
+ srt_bit | needsSRT srt || not (null vector) = [srt_label]
+ | otherwise = []
+
+ extra_bits | tablesNextToCode = reverse vector ++ srt_bit
+ | otherwise = srt_bit ++ vector
+
+-- The standard bits of an info table. This part of the info table
+-- corresponds to the StgInfoTable type defined in InfoTables.h.
+
+mkStdInfoTable
+ :: CAddrMode -- entry label
+ -> CAddrMode -- closure type descr (profiling)
+ -> CAddrMode -- closure descr (profiling)
+ -> Int -- closure type
+ -> StgHalfWord -- SRT length
+ -> CAddrMode -- layout field
+ -> [CAddrMode]
+mkStdInfoTable entry_lbl type_descr closure_descr cl_type srt_len layout_amode
+ = std_info
+ where
+ std_info
+ | tablesNextToCode = std_info'
+ | otherwise = entry_lbl : std_info'
+
+ std_info' =
+ -- par info
+ prof_info ++
+ -- ticky info
+ -- debug info
+ [layout_amode] ++
+ CLit (MachWord (fromIntegral type_info)) :
+ []
+
+ prof_info
+ | opt_SccProfilingOn = [ type_descr, closure_descr ]
+ | otherwise = []
+
+ -- sigh: building up the info table is endian-dependent.
+ -- ToDo: do this using .byte and .word directives.
+ type_info :: StgWord
+#ifdef WORDS_BIGENDIAN
+ type_info = (fromIntegral cl_type `shiftL` hALF_WORD) .|.
+ (fromIntegral srt_len)
+#else
+ type_info = (fromIntegral cl_type) .|.
+ (fromIntegral srt_len `shiftL` hALF_WORD)
+#endif
+
+isBigLiveness (Liveness _ size _) = size > mAX_SMALL_BITMAP_SIZE
+
+livenessToAddrMode :: Liveness -> CAddrMode
+livenessToAddrMode (Liveness lbl size bits)
+ | size <= mAX_SMALL_BITMAP_SIZE = small
+ | otherwise = CLbl lbl DataPtrRep
+ where
+ small = mkWordCLit (fromIntegral size .|. (small_bits `shiftL` bITMAP_BITS_SHIFT))
+ small_bits = case bits of
+ [] -> 0
+ [b] -> fromIntegral b
+ _ -> panic "livenessToAddrMode"
+
+zero_amode = mkIntCLit 0
+
+-- IA64 mangler doesn't place tables next to code
+tablesNextToCode :: Bool
+#ifdef ia64_TARGET_ARCH
+tablesNextToCode = False
+#else
+tablesNextToCode = not opt_Unregisterised
+#endif
\end{code}
projects / ghc-hetmet.git / blobdiff