X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;ds=sidebyside;f=ghc%2Fcompiler%2FbasicTypes%2FId.lhs;h=f53e85d906694310710efa2b8f031dfc14222276;hb=51a571c0f5b0201ea53bec60fcaafb78c01c017e;hp=3ba8763b5e2a1ce1afcf417f6334ca9d344595b0;hpb=451a8613203721d344e26eb043e8af827c58cd7b;p=ghc-hetmet.git diff --git a/ghc/compiler/basicTypes/Id.lhs b/ghc/compiler/basicTypes/Id.lhs index 3ba8763..f53e85d 100644 --- a/ghc/compiler/basicTypes/Id.lhs +++ b/ghc/compiler/basicTypes/Id.lhs @@ -8,96 +8,107 @@ module Id ( Id, DictId, -- Simple construction - mkId, mkVanillaId, mkSysLocal, mkUserLocal, - mkTemplateLocals, mkWildId, mkTemplateLocal, + mkGlobalId, mkLocalId, mkSpecPragmaId, mkLocalIdWithInfo, + mkSysLocal, mkUserLocal, mkVanillaGlobal, + mkTemplateLocals, mkTemplateLocalsNum, mkWildId, mkTemplateLocal, + mkWorkerId, -- Taking an Id apart idName, idType, idUnique, idInfo, - idPrimRep, isId, + idPrimRep, isId, globalIdDetails, recordSelectorFieldLabel, -- Modifying an Id - setIdName, setIdUnique, setIdType, setIdNoDiscard, - setIdInfo, modifyIdInfo, maybeModifyIdInfo, + setIdName, setIdUnique, setIdType, setIdNoDiscard, setGlobalIdDetails, + setIdInfo, lazySetIdInfo, modifyIdInfo, maybeModifyIdInfo, + zapLamIdInfo, zapDemandIdInfo, -- Predicates - omitIfaceSigForId, - externallyVisibleId, - idFreeTyVars, + isImplicitId, isDeadBinder, + isSpecPragmaId, isExportedId, isLocalId, isGlobalId, + isRecordSelector, + isPrimOpId, isPrimOpId_maybe, + isDataConId, isDataConId_maybe, + isDataConWrapId, isDataConWrapId_maybe, + isBottomingId, + hasNoBinding, -- Inline pragma stuff - getInlinePragma, setInlinePragma, modifyInlinePragma, - idMustBeINLINEd, idMustNotBeINLINEd, + idInlinePragma, setInlinePragma, modifyInlinePragma, - isSpecPragmaId, isRecordSelector, - isPrimitiveId_maybe, isDataConId_maybe, - isConstantId, isBottomingId, idAppIsBottom, - isExportedId, isUserExportedId, -- One shot lambda stuff - isOneShotLambda, setOneShotLambda, + isOneShotLambda, setOneShotLambda, clearOneShotLambda, -- IdInfo stuff setIdUnfolding, - setIdArity, + setIdArityInfo, setIdDemandInfo, setIdStrictness, + setIdTyGenInfo, setIdWorkerInfo, setIdSpecialisation, - setIdUpdateInfo, setIdCafInfo, setIdCprInfo, - - getIdArity, - getIdDemandInfo, - getIdStrictness, - getIdWorkerInfo, - getIdUnfolding, - getIdSpecialisation, - getIdUpdateInfo, - getIdCafInfo, - getIdCprInfo + setIdOccInfo, + + idArity, idArityInfo, + idDemandInfo, + idStrictness, + idTyGenInfo, + idWorkerInfo, + idUnfolding, + idSpecialisation, + idCafInfo, + idCprInfo, + idLBVarInfo, + idOccInfo, ) where #include "HsVersions.h" -import {-# SOURCE #-} CoreUnfold ( Unfolding ) -import {-# SOURCE #-} CoreSyn ( CoreRules ) +import CoreSyn ( Unfolding, CoreRules ) +import BasicTypes ( Arity ) import Var ( Id, DictId, - isId, mkIdVar, - idName, idType, idUnique, idInfo, - setIdName, setVarType, setIdUnique, - setIdInfo, modifyIdInfo, maybeModifyIdInfo, - externallyVisibleId + isId, isExportedId, isSpecPragmaId, isLocalId, + idName, idType, idUnique, idInfo, isGlobalId, + setIdName, setVarType, setIdUnique, setIdNoDiscard, + setIdInfo, lazySetIdInfo, modifyIdInfo, + maybeModifyIdInfo, + globalIdDetails, setGlobalIdDetails ) -import VarSet -import Type ( Type, tyVarsOfType, typePrimRep, addFreeTyVars ) -import IdInfo -import Demand ( Demand, isStrict, wwLazy ) +import qualified Var ( mkLocalId, mkGlobalId, mkSpecPragmaId ) +import Type ( Type, typePrimRep, addFreeTyVars, + usOnce, seqType, splitTyConApp_maybe ) + +import IdInfo + +import Demand ( Demand ) import Name ( Name, OccName, mkSysLocalName, mkLocalName, - isWiredInName, isUserExportedName + getOccName, getSrcLoc ) -import Const ( Con(..) ) +import OccName ( UserFS, mkWorkerOcc ) import PrimRep ( PrimRep ) -import PrimOp ( PrimOp ) -import FieldLabel ( FieldLabel(..) ) +import TysPrim ( statePrimTyCon ) +import FieldLabel ( FieldLabel ) import SrcLoc ( SrcLoc ) -import Unique ( Unique, mkBuiltinUnique, getBuiltinUniques ) +import Unique ( Unique, mkBuiltinUnique, getBuiltinUniques, + getNumBuiltinUniques ) import Outputable infixl 1 `setIdUnfolding`, - `setIdArity`, + `setIdArityInfo`, `setIdDemandInfo`, `setIdStrictness`, + `setIdTyGenInfo`, `setIdWorkerInfo`, `setIdSpecialisation`, - `setIdUpdateInfo`, `setInlinePragma`, - `getIdCafInfo`, - `getIdCprInfo` + `idCafInfo`, + `idCprInfo` -- infixl so you can say (id `set` a `set` b) \end{code} @@ -110,47 +121,66 @@ infixl 1 `setIdUnfolding`, %* * %************************************************************************ -Absolutely all Ids are made by mkId. It - a) Pins free-tyvar-info onto the Id's type, - where it can easily be found. - b) Ensures that exported Ids are +Absolutely all Ids are made by mkId. It is just like Var.mkId, +but in addition it pins free-tyvar-info onto the Id's type, +where it can easily be found. \begin{code} -mkId :: Name -> Type -> IdInfo -> Id -mkId name ty info = mkIdVar name (addFreeTyVars ty) info' - where - info' | isUserExportedName name = setNoDiscardInfo info - | otherwise = info +mkLocalIdWithInfo :: Name -> Type -> IdInfo -> Id +mkLocalIdWithInfo name ty info = Var.mkLocalId name (addFreeTyVars ty) info + +mkSpecPragmaId :: OccName -> Unique -> Type -> SrcLoc -> Id +mkSpecPragmaId occ uniq ty loc = Var.mkSpecPragmaId (mkLocalName uniq occ loc) + (addFreeTyVars ty) + noCafIdInfo + +mkGlobalId :: GlobalIdDetails -> Name -> Type -> IdInfo -> Id +mkGlobalId details name ty info = Var.mkGlobalId details name (addFreeTyVars ty) info \end{code} \begin{code} -mkVanillaId :: Name -> Type -> Id -mkVanillaId name ty = mkId name ty vanillaIdInfo +mkLocalId :: Name -> Type -> Id +mkLocalId name ty = mkLocalIdWithInfo name ty noCafIdInfo -- SysLocal: for an Id being created by the compiler out of thin air... -- UserLocal: an Id with a name the user might recognize... -mkUserLocal :: OccName -> Unique -> Type -> SrcLoc -> Id -mkSysLocal :: FAST_STRING -> Unique -> Type -> Id +mkUserLocal :: OccName -> Unique -> Type -> SrcLoc -> Id +mkSysLocal :: UserFS -> Unique -> Type -> Id +mkVanillaGlobal :: Name -> Type -> IdInfo -> Id -mkSysLocal fs uniq ty = mkVanillaId (mkSysLocalName uniq fs) ty -mkUserLocal occ uniq ty loc = mkVanillaId (mkLocalName uniq occ loc) ty +mkSysLocal fs uniq ty = mkLocalId (mkSysLocalName uniq fs) ty +mkUserLocal occ uniq ty loc = mkLocalId (mkLocalName uniq occ loc) ty +mkVanillaGlobal = mkGlobalId VanillaGlobal \end{code} Make some local @Ids@ for a template @CoreExpr@. These have bogus @Uniques@, but that's OK because the templates are supposed to be instantiated before use. - + \begin{code} -- "Wild Id" typically used when you need a binder that you don't expect to use mkWildId :: Type -> Id mkWildId ty = mkSysLocal SLIT("wild") (mkBuiltinUnique 1) ty +mkWorkerId :: Unique -> Id -> Type -> Id +-- A worker gets a local name. CoreTidy will globalise it if necessary. +mkWorkerId uniq unwrkr ty + = mkLocalId wkr_name ty + where + wkr_name = mkLocalName uniq (mkWorkerOcc (getOccName unwrkr)) (getSrcLoc unwrkr) + -- "Template locals" typically used in unfoldings mkTemplateLocals :: [Type] -> [Id] mkTemplateLocals tys = zipWith (mkSysLocal SLIT("tpl")) (getBuiltinUniques (length tys)) tys +mkTemplateLocalsNum :: Int -> [Type] -> [Id] +-- The Int gives the starting point for unique allocation +mkTemplateLocalsNum n tys = zipWith (mkSysLocal SLIT("tpl")) + (getNumBuiltinUniques n (length tys)) + tys + mkTemplateLocal :: Int -> Type -> Id mkTemplateLocal i ty = mkSysLocal SLIT("tpl") (mkBuiltinUnique i) ty \end{code} @@ -163,12 +193,9 @@ mkTemplateLocal i ty = mkSysLocal SLIT("tpl") (mkBuiltinUnique i) ty %************************************************************************ \begin{code} -idFreeTyVars :: Id -> TyVarSet -idFreeTyVars id = tyVarsOfType (idType id) - setIdType :: Id -> Type -> Id -- Add free tyvar info to the type -setIdType id ty = setVarType id (addFreeTyVars ty) +setIdType id ty = seqType ty `seq` setVarType id (addFreeTyVars ty) idPrimRep :: Id -> PrimRep idPrimRep id = typePrimRep (idType id) @@ -181,74 +208,80 @@ idPrimRep id = typePrimRep (idType id) %* * %************************************************************************ -\begin{code} -idFlavour :: Id -> IdFlavour -idFlavour id = flavourInfo (idInfo id) +The @SpecPragmaId@ exists only to make Ids that are +on the *LHS* of bindings created by SPECIALISE pragmas; +eg: s = f Int d +The SpecPragmaId is never itself mentioned; it +exists solely so that the specialiser will find +the call to f, and make specialised version of it. +The SpecPragmaId binding is discarded by the specialiser +when it gathers up overloaded calls. +Meanwhile, it is not discarded as dead code. -setIdNoDiscard :: Id -> Id -setIdNoDiscard id -- Make an Id into a NoDiscardId, unless it is already - = modifyIdInfo setNoDiscardInfo id +\begin{code} recordSelectorFieldLabel :: Id -> FieldLabel -recordSelectorFieldLabel id = case idFlavour id of - RecordSelId lbl -> lbl +recordSelectorFieldLabel id = case globalIdDetails id of + RecordSelId lbl -> lbl -isRecordSelector id = case idFlavour id of +isRecordSelector id = case globalIdDetails id of RecordSelId lbl -> True other -> False -isPrimitiveId_maybe id = case idFlavour id of - ConstantId (PrimOp op) -> Just op - other -> Nothing - -isDataConId_maybe id = case idFlavour id of - ConstantId (DataCon con) -> Just con - other -> Nothing - -isConstantId id = case idFlavour id of - ConstantId _ -> True - other -> False - -isSpecPragmaId id = case idFlavour id of - SpecPragmaId -> True - other -> False - --- Don't drop a binding for an exported Id, --- if it otherwise looks dead. -isExportedId :: Id -> Bool -isExportedId id = case idFlavour id of - VanillaId -> False - other -> True -- All the others are no-discard - --- Say if an Id was exported by the user --- Implies isExportedId (see mkId above) -isUserExportedId :: Id -> Bool -isUserExportedId id = isUserExportedName (idName id) -\end{code} - - -omitIfaceSigForId tells whether an Id's info is implied by other declarations, -so we don't need to put its signature in an interface file, even if it's mentioned -in some other interface unfolding. - -\begin{code} -omitIfaceSigForId :: Id -> Bool -omitIfaceSigForId id - | isWiredInName (idName id) - = True - - | otherwise - = case idFlavour id of - RecordSelId _ -> True -- Includes dictionary selectors - ConstantId _ -> True - -- ConstantIds are implied by their type or class decl; +isPrimOpId id = case globalIdDetails id of + PrimOpId op -> True + other -> False + +isPrimOpId_maybe id = case globalIdDetails id of + PrimOpId op -> Just op + other -> Nothing + +isDataConId id = case globalIdDetails id of + DataConId _ -> True + other -> False + +isDataConId_maybe id = case globalIdDetails id of + DataConId con -> Just con + other -> Nothing + +isDataConWrapId_maybe id = case globalIdDetails id of + DataConWrapId con -> Just con + other -> Nothing + +isDataConWrapId id = case globalIdDetails id of + DataConWrapId con -> True + other -> False + + -- hasNoBinding returns True of an Id which may not have a + -- binding, even though it is defined in this module. Notably, + -- the constructors of a dictionary are in this situation. +hasNoBinding id = case globalIdDetails id of + DataConId _ -> True + PrimOpId _ -> True + other -> False + +isImplicitId :: Id -> Bool + -- isImplicitId tells whether an Id's info is implied by other + -- declarations, so we don't need to put its signature in an interface + -- file, even if it's mentioned in some other interface unfolding. +isImplicitId id + = case globalIdDetails id of + RecordSelId _ -> True -- Includes dictionary selectors + PrimOpId _ -> True + DataConId _ -> True + DataConWrapId _ -> True + -- These are are implied by their type or class decl; -- remember that all type and class decls appear in the interface file. -- The dfun id must *not* be omitted, because it carries version info for -- the instance decl - - other -> False -- Don't omit! + other -> False \end{code} +\begin{code} +isDeadBinder :: Id -> Bool +isDeadBinder bndr | isId bndr = isDeadOcc (idOccInfo bndr) + | otherwise = False -- TyVars count as not dead +\end{code} %************************************************************************ @@ -260,82 +293,90 @@ omitIfaceSigForId id \begin{code} --------------------------------- -- ARITY -getIdArity :: Id -> ArityInfo -getIdArity id = arityInfo (idInfo id) +idArityInfo :: Id -> ArityInfo +idArityInfo id = arityInfo (idInfo id) -setIdArity :: Id -> ArityInfo -> Id -setIdArity id arity = modifyIdInfo (`setArityInfo` arity) id +idArity :: Id -> Arity +idArity id = arityLowerBound (idArityInfo id) + +setIdArityInfo :: Id -> ArityInfo -> Id +setIdArityInfo id arity = modifyIdInfo (`setArityInfo` arity) id --------------------------------- -- STRICTNESS -getIdStrictness :: Id -> StrictnessInfo -getIdStrictness id = strictnessInfo (idInfo id) +idStrictness :: Id -> StrictnessInfo +idStrictness id = strictnessInfo (idInfo id) setIdStrictness :: Id -> StrictnessInfo -> Id setIdStrictness id strict_info = modifyIdInfo (`setStrictnessInfo` strict_info) id -- isBottomingId returns true if an application to n args would diverge isBottomingId :: Id -> Bool -isBottomingId id = isBottomingStrictness (strictnessInfo (idInfo id)) +isBottomingId id = isBottomingStrictness (idStrictness id) + + --------------------------------- + -- TYPE GENERALISATION +idTyGenInfo :: Id -> TyGenInfo +idTyGenInfo id = tyGenInfo (idInfo id) -idAppIsBottom :: Id -> Int -> Bool -idAppIsBottom id n = appIsBottom (strictnessInfo (idInfo id)) n +setIdTyGenInfo :: Id -> TyGenInfo -> Id +setIdTyGenInfo id tygen_info = modifyIdInfo (`setTyGenInfo` tygen_info) id --------------------------------- -- WORKER ID -getIdWorkerInfo :: Id -> WorkerInfo -getIdWorkerInfo id = workerInfo (idInfo id) +idWorkerInfo :: Id -> WorkerInfo +idWorkerInfo id = workerInfo (idInfo id) setIdWorkerInfo :: Id -> WorkerInfo -> Id setIdWorkerInfo id work_info = modifyIdInfo (`setWorkerInfo` work_info) id --------------------------------- -- UNFOLDING -getIdUnfolding :: Id -> Unfolding -getIdUnfolding id = unfoldingInfo (idInfo id) +idUnfolding :: Id -> Unfolding +idUnfolding id = unfoldingInfo (idInfo id) setIdUnfolding :: Id -> Unfolding -> Id setIdUnfolding id unfolding = modifyIdInfo (`setUnfoldingInfo` unfolding) id --------------------------------- -- DEMAND -getIdDemandInfo :: Id -> Demand -getIdDemandInfo id = demandInfo (idInfo id) +idDemandInfo :: Id -> Demand +idDemandInfo id = demandInfo (idInfo id) setIdDemandInfo :: Id -> Demand -> Id setIdDemandInfo id demand_info = modifyIdInfo (`setDemandInfo` demand_info) id --------------------------------- - -- UPDATE INFO -getIdUpdateInfo :: Id -> UpdateInfo -getIdUpdateInfo id = updateInfo (idInfo id) - -setIdUpdateInfo :: Id -> UpdateInfo -> Id -setIdUpdateInfo id upd_info = modifyIdInfo (`setUpdateInfo` upd_info) id - - --------------------------------- -- SPECIALISATION -getIdSpecialisation :: Id -> CoreRules -getIdSpecialisation id = specInfo (idInfo id) +idSpecialisation :: Id -> CoreRules +idSpecialisation id = specInfo (idInfo id) setIdSpecialisation :: Id -> CoreRules -> Id setIdSpecialisation id spec_info = modifyIdInfo (`setSpecInfo` spec_info) id --------------------------------- -- CAF INFO -getIdCafInfo :: Id -> CafInfo -getIdCafInfo id = cafInfo (idInfo id) +idCafInfo :: Id -> CafInfo +idCafInfo id = cafInfo (idInfo id) setIdCafInfo :: Id -> CafInfo -> Id setIdCafInfo id caf_info = modifyIdInfo (`setCafInfo` caf_info) id --------------------------------- -- CPR INFO -getIdCprInfo :: Id -> CprInfo -getIdCprInfo id = cprInfo (idInfo id) +idCprInfo :: Id -> CprInfo +idCprInfo id = cprInfo (idInfo id) setIdCprInfo :: Id -> CprInfo -> Id setIdCprInfo id cpr_info = modifyIdInfo (`setCprInfo` cpr_info) id + + --------------------------------- + -- Occcurrence INFO +idOccInfo :: Id -> OccInfo +idOccInfo id = occInfo (idInfo id) + +setIdOccInfo :: Id -> OccInfo -> Id +setIdOccInfo id occ_info = modifyIdInfo (`setOccInfo` occ_info) id \end{code} @@ -345,34 +386,66 @@ The inline pragma tells us to be very keen to inline this Id, but it's still OK not to if optimisation is switched off. \begin{code} -getInlinePragma :: Id -> InlinePragInfo -getInlinePragma id = inlinePragInfo (idInfo id) +idInlinePragma :: Id -> InlinePragInfo +idInlinePragma id = inlinePragInfo (idInfo id) setInlinePragma :: Id -> InlinePragInfo -> Id setInlinePragma id prag = modifyIdInfo (`setInlinePragInfo` prag) id modifyInlinePragma :: Id -> (InlinePragInfo -> InlinePragInfo) -> Id modifyInlinePragma id fn = modifyIdInfo (\info -> info `setInlinePragInfo` (fn (inlinePragInfo info))) id - -idMustNotBeINLINEd id = case getInlinePragma id of - IMustNotBeINLINEd -> True - IAmALoopBreaker -> True - other -> False - -idMustBeINLINEd id = case getInlinePragma id of - IMustBeINLINEd -> True - other -> False \end{code} --------------------------------- -- ONE-SHOT LAMBDAS \begin{code} +idLBVarInfo :: Id -> LBVarInfo +idLBVarInfo id = lbvarInfo (idInfo id) + isOneShotLambda :: Id -> Bool -isOneShotLambda id = case lbvarInfo (idInfo id) of - IsOneShotLambda -> True - NoLBVarInfo -> False +isOneShotLambda id = analysis || hack + where analysis = case idLBVarInfo id of + LBVarInfo u | u == usOnce -> True + other -> False + hack = case splitTyConApp_maybe (idType id) of + Just (tycon,_) | tycon == statePrimTyCon -> True + other -> False + + -- The last clause is a gross hack. It claims that + -- every function over realWorldStatePrimTy is a one-shot + -- function. This is pretty true in practice, and makes a big + -- difference. For example, consider + -- a `thenST` \ r -> ...E... + -- The early full laziness pass, if it doesn't know that r is one-shot + -- will pull out E (let's say it doesn't mention r) to give + -- let lvl = E in a `thenST` \ r -> ...lvl... + -- When `thenST` gets inlined, we end up with + -- let lvl = E in \s -> case a s of (r, s') -> ...lvl... + -- and we don't re-inline E. + -- + -- It would be better to spot that r was one-shot to start with, but + -- I don't want to rely on that. + -- + -- Another good example is in fill_in in PrelPack.lhs. We should be able to + -- spot that fill_in has arity 2 (and when Keith is done, we will) but we can't yet. setOneShotLambda :: Id -> Id -setOneShotLambda id = modifyIdInfo (`setLBVarInfo` IsOneShotLambda) id +setOneShotLambda id = modifyIdInfo (`setLBVarInfo` LBVarInfo usOnce) id + +clearOneShotLambda :: Id -> Id +clearOneShotLambda id + | isOneShotLambda id = modifyIdInfo (`setLBVarInfo` NoLBVarInfo) id + | otherwise = id + +-- But watch out: this may change the type of something else +-- f = \x -> e +-- If we change the one-shot-ness of x, f's type changes +\end{code} + +\begin{code} +zapLamIdInfo :: Id -> Id +zapLamIdInfo id = maybeModifyIdInfo zapLamInfo id + +zapDemandIdInfo id = maybeModifyIdInfo zapDemandInfo id \end{code}