%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[CgConTbls]{Info tables and update bits for constructors}
\begin{code}
-#include "HsVersions.h"
-
module CgConTbls ( genStaticConBits ) where
-import Ubiq{-uitous-}
+#include "HsVersions.h"
import AbsCSyn
import CgMonad
-import AbsCUtils ( mkAbsCStmts, mkAbstractCs, magicIdPrimRep )
-import CgCompInfo ( uF_UPDATEE )
-import CgHeapery ( heapCheck, allocDynClosure )
-import CgRetConv ( mkLiveRegsMask,
- dataReturnConvAlg, ctrlReturnConvAlg,
- CtrlReturnConvention(..),
- DataReturnConvention(..)
- )
+import AbsCUtils ( mkAbstractCs, mkAbsCStmts )
import CgTailCall ( performReturn, mkStaticAlgReturnCode )
-import CgUsages ( getHpRelOffset )
-import CLabel ( mkConEntryLabel, mkClosureLabel,
- mkConUpdCodePtrVecLabel,
- mkStdUpdCodePtrVecLabel, mkStdUpdVecTblLabel
- )
-import ClosureInfo ( layOutStaticClosure, layOutDynCon,
- layOutPhantomClosure, closurePtrsSize,
- fitsMinUpdSize, mkConLFInfo,
- infoTableLabelFromCI, dataConLiveness
- )
-import CostCentre ( dontCareCostCentre )
-import FiniteMap ( fmToList )
-import HeapOffs ( zeroOff, VirtualHeapOffset(..) )
-import Id ( dataConTag, dataConSig,
- dataConArity, fIRST_TAG,
- emptyIdSet,
- GenId{-instance NamedThing-}
- )
-import Outputable ( getLocalName )
-import PrimRep ( getPrimRepSize, PrimRep(..) )
-import TyCon ( tyConDataCons, mkSpecTyCon )
+import ClosureInfo ( layOutStaticConstr, layOutDynConstr, ClosureInfo )
+import DataCon ( DataCon, dataConRepArgTys, isNullaryDataCon )
+import TyCon ( tyConDataCons, isEnumerationTyCon, TyCon )
import Type ( typePrimRep )
-import Util ( panic )
-
-maybeIntLikeTyCon = panic "CgConTbls.maybeIntLikeTyCon (ToDo)"
-mkSameSpecCon = panic "CgConTbls.mkSameSpecCon (ToDo)"
+import CmdLineOpts
\end{code}
For every constructor we generate the following info tables:
A static info table, for static instances of the constructor,
- For constructors which return in registers (and only them),
- an "inregs" info table. This info table is rather emaciated;
- it only contains update code and tag.
-
Plus:
\begin{tabular}{lll}
Possible info tables for constructor con:
\begin{description}
-\item[@con_info@:]
+\item[@_con_info@:]
Used for dynamically let(rec)-bound occurrences of
the constructor, and for updates. For constructors
which are int-like, char-like or nullary, when GC occurs,
the closure tries to get rid of itself.
-\item[@con_inregs_info@:]
-Used when returning a new constructor in registers.
-Only for return-in-regs constructors.
-Macro: @INREGS_INFO_TABLE@.
-
-\item[@con_static_info@:]
+\item[@_static_info@:]
Static occurrences of the constructor
macro: @STATIC_INFO_TABLE@.
\end{description}
-For zero-arity constructors, \tr{con}, we also generate a static closure:
-\begin{description}
-\item[@con_closure@:]
-A single static copy of the (zero-arity) constructor itself.
-\end{description}
+For zero-arity constructors, \tr{con}, we NO LONGER generate a static closure;
+it's place is taken by the top level defn of the constructor.
For charlike and intlike closures there is a fixed array of static
closures predeclared.
\begin{code}
genStaticConBits :: CompilationInfo -- global info about the compilation
-> [TyCon] -- tycons to generate
- -> FiniteMap TyCon [(Bool, [Maybe Type])]
- -- tycon specialisation info
-> AbstractC -- output
-genStaticConBits comp_info gen_tycons tycon_specs
+genStaticConBits comp_info gen_tycons
= -- for each type constructor:
-- grab all its data constructors;
-- for each one, generate an info table
-- C labels are local to this module i.e. static
-- since they may be duplicated in other modules
- mkAbstractCs [ gen_for_tycon tc | tc <- gen_tycons ]
- `mkAbsCStmts`
- mkAbstractCs [ mkAbstractCs [ gen_for_spec_tycon tc spec
- | (imported_spec, spec) <- specs,
- -- no code generated if spec is imported
- not imported_spec
- ]
- | (tc, specs) <- fmToList tycon_specs ]
+ mkAbstractCs [ gen_for_tycon tc `mkAbsCStmts` enum_closure_table tc
+ | tc <- gen_tycons ]
where
gen_for_tycon :: TyCon -> AbstractC
- gen_for_tycon tycon
- = mkAbstractCs (map (genConInfo comp_info tycon) data_cons)
- `mkAbsCStmts`
- maybe_tycon_vtbl
- where
- data_cons = tyConDataCons tycon
- tycon_upd_label = mkStdUpdVecTblLabel tycon
-
- maybe_tycon_vtbl =
- case ctrlReturnConvAlg tycon of
- UnvectoredReturn 1 -> CRetUnVector tycon_upd_label
- (mk_upd_label tycon (head data_cons))
- UnvectoredReturn _ -> AbsCNop
- VectoredReturn _ -> CFlatRetVector tycon_upd_label
- (map (mk_upd_label tycon) data_cons)
- ------------------
- gen_for_spec_tycon :: TyCon -> [Maybe Type] -> AbstractC
-
- gen_for_spec_tycon tycon ty_maybes
- = mkAbstractCs (map (genConInfo comp_info spec_tycon) spec_data_cons)
- `mkAbsCStmts`
- maybe_spec_tycon_vtbl
- where
- data_cons = tyConDataCons tycon
-
- spec_tycon = mkSpecTyCon tycon ty_maybes
- spec_data_cons = map (mkSameSpecCon ty_maybes) data_cons
-
- spec_tycon_upd_label = mkStdUpdVecTblLabel spec_tycon
-
- maybe_spec_tycon_vtbl =
- case ctrlReturnConvAlg spec_tycon of
- UnvectoredReturn 1 -> CRetUnVector spec_tycon_upd_label
- (mk_upd_label spec_tycon (head spec_data_cons))
- UnvectoredReturn _ -> AbsCNop
- VectoredReturn _ -> CFlatRetVector spec_tycon_upd_label
- (map (mk_upd_label spec_tycon) spec_data_cons)
- ------------------
- mk_upd_label tycon con
- = CLbl
- (case (dataReturnConvAlg con) of
- ReturnInRegs _ -> mkConUpdCodePtrVecLabel tycon tag
- ReturnInHeap -> mkStdUpdCodePtrVecLabel tycon tag)
- CodePtrRep
- where
- tag = dataConTag con
+ gen_for_tycon tycon = mkAbstractCs [ genConInfo comp_info data_con
+ | data_con <- tyConDataCons tycon ]
+
+ enum_closure_table tycon
+ | isEnumerationTyCon tycon = CClosureTbl tycon
+ | otherwise = AbsCNop
+ -- Put the table after the data constructor decls, because the
+ -- datatype closure table (for enumeration types)
+ -- to (say) PrelBase_$wTrue_closure, which is defined in code_stuff
\end{code}
+
%************************************************************************
%* *
\subsection[CgConTbls-info-tables]{Generating info tables for constructors}
static closure, for a constructor.
\begin{code}
-genConInfo :: CompilationInfo -> TyCon -> Id -> AbstractC
+genConInfo :: CompilationInfo -> DataCon -> AbstractC
-genConInfo comp_info tycon data_con
- = mkAbstractCs [
- CSplitMarker,
- inregs_upd_maybe,
+genConInfo comp_info data_con
+ = -- Order of things is to reduce forward references
+ mkAbstractCs [if opt_EnsureSplittableC then CSplitMarker else AbsCNop,
closure_code,
- static_code,
- closure_maybe]
- -- Order of things is to reduce forward references
+ static_code]
where
(closure_info, body_code) = mkConCodeAndInfo data_con
-- To allow the debuggers, interpreters, etc to cope with static
-- data structures (ie those built at compile time), we take care that
-- info-table contains the information we need.
- (static_ci,_) = layOutStaticClosure data_con typePrimRep arg_tys (mkConLFInfo data_con)
-
- body = (initC comp_info (
- profCtrC SLIT("ENT_CON") [CReg node] `thenC`
- body_code))
-
- entry_addr = CLbl entry_label CodePtrRep
- con_descr = _UNPK_ (getLocalName data_con)
-
- closure_code = CClosureInfoAndCode closure_info body Nothing
- stdUpd con_descr
- (dataConLiveness closure_info)
- static_code = CClosureInfoAndCode static_ci body Nothing
- stdUpd con_descr
- (dataConLiveness static_ci)
+ (static_ci,_) = layOutStaticConstr data_con typePrimRep arg_tys
- inregs_upd_maybe = genPhantomUpdInfo comp_info tycon data_con
+ static_body = initC comp_info (
+ profCtrC FSLIT("TICK_ENT_STATIC_CON") [CReg node] `thenC`
+ ldv_enter_and_body_code)
- stdUpd = CLbl (mkStdUpdCodePtrVecLabel tycon tag) CodePtrRep
+ closure_body = initC comp_info (
+ profCtrC FSLIT("TICK_ENT_DYN_CON") [CReg node] `thenC`
+ ldv_enter_and_body_code)
- tag = dataConTag data_con
+ ldv_enter_and_body_code = ldvEnter `thenC` body_code
- cost_centre = mkCCostCentre dontCareCostCentre -- not worried about static data costs
+ -- Don't need any dynamic closure code for zero-arity constructors
+ closure_code = if zero_arity_con then
+ AbsCNop
+ else
+ CClosureInfoAndCode closure_info closure_body
- -- For zero-arity data constructors, or, more accurately,
- -- those which only have VoidRep args (or none):
- -- We make the closure too (not just info tbl), so that we can share
- -- one copy throughout.
- closure_maybe = if not (all zero_size arg_tys) then
- AbsCNop
- else
- CStaticClosure closure_label -- Label for closure
- static_ci -- Info table
- cost_centre
- [{-No args! A slight lie for constrs with VoidRep args-}]
+ static_code = CClosureInfoAndCode static_ci static_body
- zero_size arg_ty = getPrimRepSize (typePrimRep arg_ty) == 0
+ zero_arity_con = isNullaryDataCon data_con
+ -- We used to check that all the arg-sizes were zero, but we don't
+ -- really have any constructors with only zero-size args, and it's
+ -- just one more thing to go wrong.
- (_,_,arg_tys,_) = dataConSig data_con
- con_arity = dataConArity data_con
- entry_label = mkConEntryLabel data_con
- closure_label = mkClosureLabel data_con
+ arg_tys = dataConRepArgTys data_con
\end{code}
\begin{code}
-mkConCodeAndInfo :: Id -- Data constructor
+mkConCodeAndInfo :: DataCon -- Data constructor
-> (ClosureInfo, Code) -- The info table
mkConCodeAndInfo con
- = case (dataReturnConvAlg con) of
-
- ReturnInRegs regs ->
- let
- (closure_info, regs_w_offsets)
- = layOutDynCon con magicIdPrimRep regs
-
- body_code
- = profCtrC SLIT("RET_OLD_IN_REGS") [mkIntCLit (length regs_w_offsets)] `thenC`
-
- performReturn (mkAbstractCs (map move_to_reg regs_w_offsets))
- (mkStaticAlgReturnCode con Nothing {- Info-ptr already loaded-})
- emptyIdSet{-no live vars-}
- in
- (closure_info, body_code)
-
- ReturnInHeap ->
- let
- (_, _, arg_tys, _) = dataConSig con
+ = let
+ arg_tys = dataConRepArgTys con
- (closure_info, arg_things)
- = layOutDynCon con typePrimRep arg_tys
+ (closure_info, arg_things) = layOutDynConstr con typePrimRep arg_tys
- body_code
+ body_code
= -- NB: We don't set CC when entering data (WDP 94/06)
- profCtrC SLIT("RET_OLD_IN_HEAP") [mkIntCLit (length arg_things)] `thenC`
+ profCtrC FSLIT("TICK_RET_OLD")
+ [mkIntCLit (length arg_things)] `thenC`
- performReturn AbsCNop -- Ptr to thing already in Node
- (mkStaticAlgReturnCode con Nothing {- Info-ptr already loaded-})
- emptyIdSet{-no live vars-}
+ performReturn AbsCNop -- Ptr to thing already in Node
+ (mkStaticAlgReturnCode con)
in
(closure_info, body_code)
-
- where
- move_to_reg :: (MagicId, VirtualHeapOffset {-from Node-}) -> AbstractC
- move_to_reg (reg, offset)
- = CAssign (CReg reg) (CVal (NodeRel offset) (magicIdPrimRep reg))
-\end{code}
-
-%************************************************************************
-%* *
-\subsection[CgConTbls-updates]{Generating update bits for constructors}
-%* *
-%************************************************************************
-
-Generate the "phantom" info table and update code, iff the constructor returns in regs
-
-\begin{code}
-
-genPhantomUpdInfo :: CompilationInfo -> TyCon -> Id{-data con-} -> AbstractC
-
-genPhantomUpdInfo comp_info tycon data_con
- = case (dataReturnConvAlg data_con) of
-
- ReturnInHeap -> AbsCNop -- No need for a phantom update
-
- ReturnInRegs regs ->
- let
- phantom_itbl = CClosureInfoAndCode phantom_ci AbsCNop Nothing
- upd_code con_descr
- (dataConLiveness phantom_ci)
-
- phantom_ci = layOutPhantomClosure data_con (mkConLFInfo data_con)
-
- con_descr = _UNPK_ (getLocalName data_con)
-
- con_arity = dataConArity data_con
-
- upd_code = CLabelledCode upd_label (mkAbsCStmts build_closure perform_return)
- upd_label = mkConUpdCodePtrVecLabel tycon tag
- tag = dataConTag data_con
-
- updatee = CVal (SpBRel 0 (- uF_UPDATEE)) PtrRep
-
- perform_return = mkAbstractCs
- [
- CMacroStmt POP_STD_UPD_FRAME [],
- CReturn (CReg RetReg) return_info
- ]
-
- return_info =
- case (ctrlReturnConvAlg tycon) of
- UnvectoredReturn _ -> DirectReturn
- VectoredReturn _ -> StaticVectoredReturn (tag - fIRST_TAG)
-
- -- Determine cost centre for the updated closures CC (and allocation)
- -- CCC for lexical (now your only choice)
- use_cc = CReg CurCostCentre -- what to put in the closure
- blame_cc = use_cc -- who to blame for allocation
-
- do_move (reg, virt_offset) =
- CAssign (CVal (NodeRel virt_offset) (magicIdPrimRep reg)) (CReg reg)
-
-
- -- Code for building a new constructor in place over the updatee
- overwrite_code
- = profCtrC SLIT("UPD_CON_IN_PLACE")
- [mkIntCLit (length regs_w_offsets)] `thenC`
- absC (mkAbstractCs
- [
- CAssign (CReg node) updatee,
-
- -- Tell the storage mgr that we intend to update in place
- -- This may (in complicated mgrs eg generational) cause gc,
- -- and it may modify Node to point to another place to
- -- actually update into.
- CMacroStmt upd_inplace_macro [liveness_mask],
-
- -- Initialise the closure pointed to by node
- CInitHdr closure_info (NodeRel zeroOff) use_cc True,
- mkAbstractCs (map do_move regs_w_offsets),
- if con_arity /= 0 then
- CAssign (CReg infoptr) (CLbl info_label DataPtrRep)
- else
- AbsCNop
- ])
-
- upd_inplace_macro = if closurePtrsSize closure_info == 0
- then UPD_INPLACE_NOPTRS
- else UPD_INPLACE_PTRS
-
- -- Code for allocating a new constructor in the heap
- alloc_code
- = let
- amodes_w_offsets = [ (CReg r, o) | (r,o) <- regs_w_offsets ]
- in
- -- Allocate and build closure specifying upd_new_w_regs
- allocDynClosure closure_info use_cc blame_cc amodes_w_offsets
- `thenFC` \ hp_offset ->
- getHpRelOffset hp_offset `thenFC` \ hp_rel ->
- let
- amode = CAddr hp_rel
- in
- profCtrC SLIT("UPD_CON_IN_NEW")
- [mkIntCLit (length amodes_w_offsets)] `thenC`
- absC (mkAbstractCs
- [ CMacroStmt UPD_IND [updatee, amode],
- CAssign (CReg node) amode,
- CAssign (CReg infoptr) (CLbl info_label DataPtrRep)
- ])
-
- (closure_info, regs_w_offsets) = layOutDynCon data_con magicIdPrimRep regs
- info_label = infoTableLabelFromCI closure_info
- liveness_mask = mkIntCLit (mkLiveRegsMask (node:regs))
-
- build_closure =
- if fitsMinUpdSize closure_info then
- initC comp_info overwrite_code
- else
- initC comp_info (heapCheck regs False alloc_code)
-
- in CClosureUpdInfo phantom_itbl
-
\end{code}
-
projects / ghc-hetmet.git / blobdiff