X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FbasicTypes%2FId.lhs;h=c7ce818adb64b34fe7e59fc5ca7542377fd50cd2;hb=28a464a75e14cece5db40f2765a29348273ff2d2;hp=bd9fffbf4993a61371116a3ae4a77799638ee23a;hpb=957bf3756ffd56f5329a2aabe1022d6f996dd641;p=ghc-hetmet.git diff --git a/ghc/compiler/basicTypes/Id.lhs b/ghc/compiler/basicTypes/Id.lhs index bd9fffb..c7ce818 100644 --- a/ghc/compiler/basicTypes/Id.lhs +++ b/ghc/compiler/basicTypes/Id.lhs @@ -8,38 +8,39 @@ module Id ( Id, DictId, -- Simple construction - mkGlobalId, mkLocalId, mkSpecPragmaId, mkLocalIdWithInfo, - mkSysLocal, mkSysLocalUnencoded, mkUserLocal, mkVanillaGlobal, + mkGlobalId, mkLocalId, mkLocalIdWithInfo, + mkSysLocal, mkUserLocal, mkVanillaGlobal, mkTemplateLocals, mkTemplateLocalsNum, mkWildId, mkTemplateLocal, - mkWorkerId, + mkWorkerId, mkExportedLocalId, -- Taking an Id apart idName, idType, idUnique, idInfo, - idPrimRep, isId, globalIdDetails, + isId, globalIdDetails, idPrimRep, recordSelectorFieldLabel, -- Modifying an Id - setIdName, setIdUnique, setIdType, setIdLocalExported, setGlobalIdDetails, + setIdName, setIdUnique, Id.setIdType, setIdExported, setIdNotExported, setIdInfo, lazySetIdInfo, modifyIdInfo, maybeModifyIdInfo, zapLamIdInfo, zapDemandIdInfo, -- Predicates - isImplicitId, isDeadBinder, - isSpecPragmaId, isExportedId, isLocalId, isGlobalId, - isRecordSelector, + isImplicitId, isDeadBinder, isDictId, + isExportedId, isLocalId, isGlobalId, + isRecordSelector, isNaughtyRecordSelector, + isClassOpId_maybe, isPrimOpId, isPrimOpId_maybe, isFCallId, isFCallId_maybe, - isDataConId, isDataConId_maybe, - isDataConWrapId, isDataConWrapId_maybe, - isBottomingId, - hasNoBinding, + isDataConWorkId, isDataConWorkId_maybe, isDataConId_maybe, idDataCon, + isBottomingId, idIsFrom, + hasNoBinding, -- Inline pragma stuff idInlinePragma, setInlinePragma, modifyInlinePragma, -- One shot lambda stuff - isOneShotLambda, setOneShotLambda, clearOneShotLambda, + isOneShotBndr, isOneShotLambda, isStateHackType, + setOneShotLambda, clearOneShotLambda, -- IdInfo stuff setIdUnfolding, @@ -48,7 +49,7 @@ module Id ( setIdNewStrictness, zapIdNewStrictness, setIdWorkerInfo, setIdSpecialisation, - setIdCgInfo, + setIdCafInfo, setIdOccInfo, #ifdef OLD_STRICTNESS @@ -66,7 +67,6 @@ module Id ( idWorkerInfo, idUnfolding, idSpecialisation, idCoreRules, - idCgInfo, idCafInfo, idLBVarInfo, idOccInfo, @@ -80,35 +80,41 @@ module Id ( #include "HsVersions.h" -import CoreSyn ( Unfolding, CoreRules, IdCoreRule, rulesRules ) +import CoreSyn ( Unfolding, CoreRule ) import BasicTypes ( Arity ) import Var ( Id, DictId, - isId, isExportedId, isSpecPragmaId, isLocalId, + isId, isExportedId, isLocalId, idName, idType, idUnique, idInfo, isGlobalId, - setIdName, setVarType, setIdUnique, setIdLocalExported, + setIdName, setIdType, setIdUnique, + setIdExported, setIdNotExported, setIdInfo, lazySetIdInfo, modifyIdInfo, maybeModifyIdInfo, - globalIdDetails, setGlobalIdDetails + globalIdDetails ) -import qualified Var ( mkLocalId, mkGlobalId, mkSpecPragmaId ) -import Type ( Type, typePrimRep, addFreeTyVars, - seqType, splitTyConApp_maybe ) - +import qualified Var ( mkLocalId, mkGlobalId, mkExportedLocalId ) +import TyCon ( FieldLabel, TyCon ) +import Type ( Type, typePrimRep, addFreeTyVars, seqType, + splitTyConApp_maybe, PrimRep ) +import TcType ( isDictTy ) +import TysPrim ( statePrimTyCon ) import IdInfo +#ifdef OLD_STRICTNESS import qualified Demand ( Demand ) +#endif +import DataCon ( DataCon, isUnboxedTupleCon ) import NewDemand ( Demand, StrictSig, topDmd, topSig, isBottomingSig ) -import Name ( Name, OccName, - mkSystemName, mkSystemNameEncoded, mkInternalName, - getOccName, getSrcLoc - ) -import OccName ( EncodedFS, mkWorkerOcc ) -import PrimRep ( PrimRep ) -import FieldLabel ( FieldLabel ) +import Name ( Name, OccName, nameIsLocalOrFrom, + mkSystemVarName, mkInternalName, getOccName, + getSrcLoc ) +import Module ( Module ) +import OccName ( mkWorkerOcc ) import Maybes ( orElse ) import SrcLoc ( SrcLoc ) import Outputable import Unique ( Unique, mkBuiltinUnique ) +import FastString ( FastString ) +import StaticFlags ( opt_NoStateHack ) -- infixl so you can say (id `set` a `set` b) infixl 1 `setIdUnfolding`, @@ -142,8 +148,8 @@ where it can easily be found. mkLocalIdWithInfo :: Name -> Type -> IdInfo -> Id mkLocalIdWithInfo name ty info = Var.mkLocalId name (addFreeTyVars ty) info -mkSpecPragmaId :: Name -> Type -> Id -mkSpecPragmaId name ty = Var.mkSpecPragmaId name (addFreeTyVars ty) vanillaIdInfo +mkExportedLocalId :: Name -> Type -> Id +mkExportedLocalId name ty = Var.mkExportedLocalId name (addFreeTyVars ty) vanillaIdInfo mkGlobalId :: GlobalIdDetails -> Name -> Type -> IdInfo -> Id mkGlobalId details name ty info = Var.mkGlobalId details name (addFreeTyVars ty) info @@ -156,15 +162,10 @@ mkLocalId name ty = mkLocalIdWithInfo name ty vanillaIdInfo -- 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 :: EncodedFS -> Unique -> Type -> Id +mkSysLocal :: FastString -> Unique -> Type -> Id mkVanillaGlobal :: Name -> Type -> IdInfo -> Id --- for SysLocal, we assume the base name is already encoded, to avoid --- re-encoding the same string over and over again. -mkSysLocal fs uniq ty = mkLocalId (mkSystemNameEncoded uniq fs) ty - --- version to use when the faststring needs to be encoded -mkSysLocalUnencoded fs uniq ty = mkLocalId (mkSystemName uniq fs) ty +mkSysLocal fs uniq ty = mkLocalId (mkSystemVarName uniq fs) ty mkUserLocal occ uniq ty loc = mkLocalId (mkInternalName uniq occ loc) ty mkVanillaGlobal = mkGlobalId VanillaGlobal @@ -208,7 +209,7 @@ mkTemplateLocal i ty = mkSysLocal FSLIT("tpl") (mkBuiltinUnique i) ty \begin{code} setIdType :: Id -> Type -> Id -- Add free tyvar info to the type -setIdType id ty = seqType ty `seq` setVarType id (addFreeTyVars ty) +setIdType id ty = seqType ty `seq` Var.setIdType id (addFreeTyVars ty) idPrimRep :: Id -> PrimRep idPrimRep id = typePrimRep (idType id) @@ -221,26 +222,24 @@ idPrimRep id = typePrimRep (idType 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. - - \begin{code} -recordSelectorFieldLabel :: Id -> FieldLabel +recordSelectorFieldLabel :: Id -> (TyCon, FieldLabel) recordSelectorFieldLabel id = case globalIdDetails id of - RecordSelId lbl -> lbl + RecordSelId tycon lbl _ -> (tycon,lbl) + other -> panic "recordSelectorFieldLabel" isRecordSelector id = case globalIdDetails id of - RecordSelId lbl -> True + RecordSelId {} -> True other -> False +isNaughtyRecordSelector id = case globalIdDetails id of + RecordSelId { sel_naughty = n } -> n + other -> False + +isClassOpId_maybe id = case globalIdDetails id of + ClassOpId cls -> Just cls + _other -> Nothing + isPrimOpId id = case globalIdDetails id of PrimOpId op -> True other -> False @@ -257,31 +256,45 @@ isFCallId_maybe id = case globalIdDetails id of FCallId call -> Just call other -> Nothing -isDataConId id = case globalIdDetails id of - DataConId _ -> True - other -> False +isDataConWorkId id = case globalIdDetails id of + DataConWorkId _ -> True + other -> False + +isDataConWorkId_maybe id = case globalIdDetails id of + DataConWorkId con -> Just con + other -> Nothing +isDataConId_maybe :: Id -> Maybe DataCon isDataConId_maybe id = case globalIdDetails id of - DataConId con -> Just con - other -> Nothing + DataConWorkId con -> Just con + DataConWrapId con -> Just con + other -> Nothing -isDataConWrapId_maybe id = case globalIdDetails id of - DataConWrapId con -> Just con - other -> Nothing +idDataCon :: Id -> DataCon +-- Get from either the worker or the wrapper to the DataCon +-- Currently used only in the desugarer +-- INVARIANT: idDataCon (dataConWrapId d) = d +-- (Remember, dataConWrapId can return either the wrapper or the worker.) +idDataCon id = case globalIdDetails id of + DataConWorkId con -> con + DataConWrapId con -> con + other -> pprPanic "idDataCon" (ppr id) -isDataConWrapId id = case globalIdDetails id of - DataConWrapId con -> True - other -> False + +isDictId :: Id -> Bool +isDictId id = isDictTy (idType id) -- hasNoBinding returns True of an Id which may not have a -- binding, even though it is defined in this module. -- Data constructor workers used to be things of this kind, but -- they aren't any more. Instead, we inject a binding for --- them at the CorePrep stage. +-- them at the CorePrep stage. +-- EXCEPT: unboxed tuples, which definitely have no binding hasNoBinding id = case globalIdDetails id of - PrimOpId _ -> True - FCallId _ -> True - other -> False + PrimOpId _ -> True + FCallId _ -> True + DataConWorkId dc -> isUnboxedTupleCon dc + other -> False isImplicitId :: Id -> Bool -- isImplicitId tells whether an Id's info is implied by other @@ -289,16 +302,20 @@ isImplicitId :: Id -> Bool -- file, even if it's mentioned in some other interface unfolding. isImplicitId id = case globalIdDetails id of - RecordSelId _ -> True -- Includes dictionary selectors + RecordSelId {} -> True FCallId _ -> True PrimOpId _ -> True - DataConId _ -> True + ClassOpId _ -> True + DataConWorkId _ -> 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 + -- The dfun id is not an implicit Id; it must *not* be omitted, because + -- it carries version info for the instance decl other -> False + +idIsFrom :: Module -> Id -> Bool +idIsFrom mod id = nameIsLocalOrFrom mod (idName id) \end{code} \begin{code} @@ -386,30 +403,16 @@ setIdNewDemandInfo id dmd = modifyIdInfo (`setNewDemandInfo` Just dmd) id --------------------------------- -- SPECIALISATION -idSpecialisation :: Id -> CoreRules +idSpecialisation :: Id -> SpecInfo idSpecialisation id = specInfo (idInfo id) -idCoreRules :: Id -> [IdCoreRule] -idCoreRules id = [(id,rule) | rule <- rulesRules (idSpecialisation id)] +idCoreRules :: Id -> [CoreRule] +idCoreRules id = specInfoRules (idSpecialisation id) -setIdSpecialisation :: Id -> CoreRules -> Id +setIdSpecialisation :: Id -> SpecInfo -> Id setIdSpecialisation id spec_info = modifyIdInfo (`setSpecInfo` spec_info) id --------------------------------- - -- CG INFO -idCgInfo :: Id -> CgInfo -#ifdef OLD_STRICTNESS -idCgInfo id = case cgInfo (idInfo id) of - NoCgInfo -> pprPanic "idCgInfo" (ppr id) - info -> info -#else -idCgInfo id = cgInfo (idInfo id) -#endif - -setIdCgInfo :: Id -> CgInfo -> Id -setIdCgInfo id cg_info = modifyIdInfo (`setCgInfo` cg_info) id - - --------------------------------- -- CAF INFO idCafInfo :: Id -> CafInfo #ifdef OLD_STRICTNESS @@ -417,8 +420,12 @@ idCafInfo id = case cgInfo (idInfo id) of NoCgInfo -> pprPanic "idCafInfo" (ppr id) info -> cgCafInfo info #else -idCafInfo id = cgCafInfo (idCgInfo id) +idCafInfo id = cafInfo (idInfo id) #endif + +setIdCafInfo :: Id -> CafInfo -> Id +setIdCafInfo id caf_info = modifyIdInfo (`setCafInfo` caf_info) id + --------------------------------- -- CPR INFO #ifdef OLD_STRICTNESS @@ -462,6 +469,39 @@ modifyInlinePragma id fn = modifyIdInfo (\info -> info `setInlinePragInfo` (fn ( idLBVarInfo :: Id -> LBVarInfo idLBVarInfo id = lbvarInfo (idInfo id) +isOneShotBndr :: Id -> Bool +-- This one is the "business end", called externally. +-- Its main purpose is to encapsulate the Horrible State Hack +isOneShotBndr id = isOneShotLambda id || (isStateHackType (idType id)) + +isStateHackType :: Type -> Bool +isStateHackType ty + | opt_NoStateHack + = False + | otherwise + = case splitTyConApp_maybe ty of + Just (tycon,_) -> tycon == statePrimTyCon + other -> False + -- This 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. + + +-- The OneShotLambda functions simply fiddle with the IdInfo flag isOneShotLambda :: Id -> Bool isOneShotLambda id = case idLBVarInfo id of IsOneShotLambda -> True