X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;ds=sidebyside;f=ghc%2Fcompiler%2FbasicTypes%2FMkId.lhs;h=11dcc395b6e5a3c4e9e6bbaa294237dcdeac1e86;hb=caac75c6a454396dadff0323162ed14adb4893cd;hp=69dec383dec4ccbda3334b3c1c47e62f664ee58f;hpb=0fa26afe25a285f7d99cea8fd6e7c8258c81325d;p=ghc-hetmet.git diff --git a/ghc/compiler/basicTypes/MkId.lhs b/ghc/compiler/basicTypes/MkId.lhs index 69dec38..11dcc39 100644 --- a/ghc/compiler/basicTypes/MkId.lhs +++ b/ghc/compiler/basicTypes/MkId.lhs @@ -21,23 +21,23 @@ module MkId ( mkPrimOpId, mkFCallId, -- And some particular Ids; see below for why they are wired in - wiredInIds, - unsafeCoerceId, realWorldPrimId, - eRROR_ID, rEC_SEL_ERROR_ID, pAT_ERROR_ID, rEC_CON_ERROR_ID, - rEC_UPD_ERROR_ID, iRREFUT_PAT_ERROR_ID, nON_EXHAUSTIVE_GUARDS_ERROR_ID, - nO_METHOD_BINDING_ERROR_ID, aBSENT_ERROR_ID, pAR_ERROR_ID + wiredInIds, ghcPrimIds, + unsafeCoerceId, realWorldPrimId, voidArgId, nullAddrId, + eRROR_ID, eRROR_CSTRING_ID, rEC_SEL_ERROR_ID, pAT_ERROR_ID, + rEC_CON_ERROR_ID, rEC_UPD_ERROR_ID, iRREFUT_PAT_ERROR_ID, + nON_EXHAUSTIVE_GUARDS_ERROR_ID, nO_METHOD_BINDING_ERROR_ID, + aBSENT_ERROR_ID, pAR_ERROR_ID ) where #include "HsVersions.h" -import BasicTypes ( Arity ) -import TysPrim ( openAlphaTyVars, alphaTyVar, alphaTy, - intPrimTy, realWorldStatePrimTy +import BasicTypes ( Arity, StrictnessMark(..), isMarkedUnboxed, isMarkedStrict ) +import TysPrim ( openAlphaTyVars, alphaTyVar, alphaTy, betaTyVar, betaTy, + intPrimTy, realWorldStatePrimTy, addrPrimTy ) import TysWiredIn ( charTy, mkListTy ) -import PrelNames ( pREL_ERR, pREL_GHC ) -import PrelRules ( primOpRule ) +import PrelRules ( primOpRules ) import Rules ( addRule ) import TcType ( Type, ThetaType, mkDictTy, mkPredTys, mkTyConApp, mkTyVarTys, mkClassPred, tcEqPred, @@ -46,9 +46,9 @@ import TcType ( Type, ThetaType, mkDictTy, mkPredTys, mkTyConApp, tcSplitFunTys, tcSplitForAllTys, mkPredTy ) import Module ( Module ) -import CoreUtils ( exprType, mkInlineMe ) +import CoreUtils ( exprType ) import CoreUnfold ( mkTopUnfolding, mkCompulsoryUnfolding, mkOtherCon ) -import Literal ( Literal(..) ) +import Literal ( Literal(..), nullAddrLit ) import TyCon ( TyCon, isNewTyCon, tyConTyVars, tyConDataCons, tyConTheta, isProductTyCon, isDataTyCon, isRecursiveTyCon ) import Class ( Class, classTyCon, classTyVars, classSelIds ) @@ -58,11 +58,9 @@ import Name ( mkWiredInName, mkFCallName, Name ) import OccName ( mkVarOcc ) import PrimOp ( PrimOp(DataToTagOp), primOpSig, mkPrimOpIdName ) import ForeignCall ( ForeignCall ) -import Demand ( wwStrict, wwPrim, mkStrictnessInfo, noStrictnessInfo, - StrictnessMark(..), isMarkedUnboxed, isMarkedStrict ) import DataCon ( DataCon, dataConFieldLabels, dataConRepArity, dataConTyCon, - dataConArgTys, dataConRepType, dataConRepStrictness, + dataConArgTys, dataConRepType, dataConInstOrigArgTys, dataConName, dataConTheta, dataConSig, dataConStrictMarks, dataConId, @@ -70,24 +68,27 @@ import DataCon ( DataCon, ) import Id ( idType, mkGlobalId, mkVanillaGlobal, mkSysLocal, mkTemplateLocals, mkTemplateLocalsNum, - mkTemplateLocal, idCprInfo, idName + mkTemplateLocal, idNewStrictness, idName ) import IdInfo ( IdInfo, noCafNoTyGenIdInfo, - exactArity, setUnfoldingInfo, setCprInfo, - setArityInfo, setSpecInfo, setCgInfo, - setStrictnessInfo, - mkNewStrictnessInfo, setNewStrictnessInfo, - GlobalIdDetails(..), CafInfo(..), CprInfo(..), - CgInfo(..), setCgArity + setUnfoldingInfo, + setArityInfo, setSpecInfo, setCafInfo, + setAllStrictnessInfo, + GlobalIdDetails(..), CafInfo(..) ) +import NewDemand ( mkStrictSig, strictSigResInfo, DmdResult(..), + mkTopDmdType, topDmd, evalDmd, lazyDmd, + Demand(..), Demands(..) ) import FieldLabel ( mkFieldLabel, fieldLabelName, firstFieldLabelTag, allFieldLabelTags, fieldLabelType ) +import DmdAnal ( dmdAnalTopRhs ) import CoreSyn import Unique ( mkBuiltinUnique ) import Maybes import PrelNames import Maybe ( isJust ) +import Util ( dropList, isSingleton ) import Outputable import ListSetOps ( assoc, assocMaybe ) import UnicodeUtil ( stringToUtf8 ) @@ -108,23 +109,30 @@ wiredInIds -- -- [The interface file format now carry such information, but there's -- no way yet of expressing at the definition site for these - -- error-reporting - -- functions that they have an 'open' result type. -- sof 1/99] - - aBSENT_ERROR_ID - , eRROR_ID - , iRREFUT_PAT_ERROR_ID - , nON_EXHAUSTIVE_GUARDS_ERROR_ID - , nO_METHOD_BINDING_ERROR_ID - , pAR_ERROR_ID - , pAT_ERROR_ID - , rEC_CON_ERROR_ID - , rEC_UPD_ERROR_ID - - -- These three can't be defined in Haskell - , realWorldPrimId - , unsafeCoerceId - , getTagId + -- error-reporting functions that they have an 'open' + -- result type. -- sof 1/99] + + aBSENT_ERROR_ID, + eRROR_ID, + eRROR_CSTRING_ID, + iRREFUT_PAT_ERROR_ID, + nON_EXHAUSTIVE_GUARDS_ERROR_ID, + nO_METHOD_BINDING_ERROR_ID, + pAR_ERROR_ID, + pAT_ERROR_ID, + rEC_CON_ERROR_ID, + rEC_UPD_ERROR_ID + ] ++ ghcPrimIds + +-- These Ids are exported from GHC.Prim +ghcPrimIds + = [ -- These can't be defined in Haskell, but they have + -- perfectly reasonable unfoldings in Core + realWorldPrimId, + unsafeCoerceId, + nullAddrId, + getTagId, + seqId ] \end{code} @@ -139,26 +147,38 @@ mkDataConId :: Name -> DataCon -> Id -- Makes the *worker* for the data constructor; that is, the function -- that takes the reprsentation arguments and builds the constructor. mkDataConId work_name data_con - = id + = mkGlobalId (DataConId data_con) work_name (dataConRepType data_con) info where - id = mkGlobalId (DataConId data_con) work_name (dataConRepType data_con) info info = noCafNoTyGenIdInfo - `setCgArity` arity - `setArityInfo` arity - `setCprInfo` cpr_info - `setStrictnessInfo` strict_info - `setNewStrictnessInfo` mkNewStrictnessInfo id arity strict_info cpr_info - - arity = dataConRepArity data_con - strict_info = mkStrictnessInfo (dataConRepStrictness data_con, False) + `setArityInfo` arity + `setAllStrictnessInfo` Just strict_sig + + arity = dataConRepArity data_con + + strict_sig = mkStrictSig (mkTopDmdType (replicate arity topDmd) cpr_info) + -- Notice that we do *not* say the worker is strict + -- even if the data constructor is declared strict + -- e.g. data T = MkT !(Int,Int) + -- Why? Because the *wrapper* is strict (and its unfolding has case + -- expresssions that do the evals) but the *worker* itself is not. + -- If we pretend it is strict then when we see + -- case x of y -> $wMkT y + -- the simplifier thinks that y is "sure to be evaluated" (because + -- $wMkT is strict) and drops the case. No, $wMkT is not strict. + -- + -- When the simplifer sees a pattern + -- case e of MkT x -> ... + -- it uses the dataConRepStrictness of MkT to mark x as evaluated; + -- but that's fine... dataConRepStrictness comes from the data con + -- not from the worker Id. tycon = dataConTyCon data_con cpr_info | isProductTyCon tycon && isDataTyCon tycon && arity > 0 && - arity <= mAX_CPR_SIZE = ReturnsCPR - | otherwise = NoCPRInfo - -- ReturnsCPR is only true for products that are real data types; + arity <= mAX_CPR_SIZE = RetCPR + | otherwise = TopRes + -- RetCPR is only true for products that are real data types; -- that is, not unboxed tuples or [non-recursive] newtypes mAX_CPR_SIZE :: Arity @@ -212,57 +232,64 @@ Notice that \begin{code} mkDataConWrapId data_con - = wrap_id + = mkGlobalId (DataConWrapId data_con) (dataConName data_con) wrap_ty info where - wrap_id = mkGlobalId (DataConWrapId data_con) (dataConName data_con) wrap_ty info work_id = dataConId data_con info = noCafNoTyGenIdInfo - `setUnfoldingInfo` mkTopUnfolding (mkInlineMe wrap_rhs) - `setCprInfo` cpr_info - -- The Cpr info can be important inside INLINE rhss, where the - -- wrapper constructor isn't inlined - `setCgArity` arity + `setUnfoldingInfo` wrap_unf -- The NoCaf-ness is set by noCafNoTyGenIdInfo `setArityInfo` arity -- It's important to specify the arity, so that partial -- applications are treated as values - `setNewStrictnessInfo` mkNewStrictnessInfo wrap_id arity noStrictnessInfo cpr_info - - wrap_ty = mkForAllTys all_tyvars $ - mkFunTys all_arg_tys - result_ty - - cpr_info = idCprInfo work_id - - wrap_rhs | isNewTyCon tycon - = ASSERT( null ex_tyvars && null ex_dict_args && length orig_arg_tys == 1 ) + `setAllStrictnessInfo` Just wrap_sig + + wrap_ty = mkForAllTys all_tyvars (mkFunTys all_arg_tys result_ty) + + wrap_sig = mkStrictSig (mkTopDmdType arg_dmds res_info) + res_info = strictSigResInfo (idNewStrictness work_id) + arg_dmds = [Abs | d <- dict_args] ++ map mk_dmd strict_marks + mk_dmd str | isMarkedStrict str = evalDmd + | otherwise = lazyDmd + -- The Cpr info can be important inside INLINE rhss, where the + -- wrapper constructor isn't inlined. + -- And the argument strictness can be important too; we + -- may not inline a contructor when it is partially applied. + -- For example: + -- data W = C !Int !Int !Int + -- ...(let w = C x in ...(w p q)...)... + -- we want to see that w is strict in its two arguments + + wrap_unf | isNewTyCon tycon + = ASSERT( null ex_tyvars && null ex_dict_args && isSingleton orig_arg_tys ) -- No existentials on a newtype, but it can have a context -- e.g. newtype Eq a => T a = MkT (...) + mkTopUnfolding $ Note InlineMe $ mkLams tyvars $ mkLams dict_args $ Lam id_arg1 $ - mkNewTypeBody tycon result_ty id_arg1 + mkNewTypeBody tycon result_ty (Var id_arg1) | null dict_args && not (any isMarkedStrict strict_marks) - = Var work_id -- The common case. Not only is this efficient, - -- but it also ensures that the wrapper is replaced - -- by the worker even when there are no args. - -- f (:) x - -- becomes - -- f $w: x - -- This is really important in rule matching, - -- (We could match on the wrappers, - -- but that makes it less likely that rules will match - -- when we bring bits of unfoldings together.) + = mkCompulsoryUnfolding (Var work_id) + -- The common case. Not only is this efficient, + -- but it also ensures that the wrapper is replaced + -- by the worker even when there are no args. + -- f (:) x + -- becomes + -- f $w: x + -- This is really important in rule matching, + -- (We could match on the wrappers, + -- but that makes it less likely that rules will match + -- when we bring bits of unfoldings together.) -- -- NB: because of this special case, (map (:) ys) turns into - -- (map $w: ys), and thence into (map (\x xs. $w: x xs) ys) - -- in core-to-stg. The top-level defn for (:) is never used. + -- (map $w: ys). The top-level defn for (:) is never used. -- This is somewhat of a bore, but I'm currently leaving it -- as is, so that there still is a top level curried (:) for -- the interpreter to call. | otherwise - = mkLams all_tyvars $ mkLams dict_args $ + = mkTopUnfolding $ Note InlineMe $ + mkLams all_tyvars $ mkLams dict_args $ mkLams ex_dict_args $ mkLams id_args $ foldr mk_case con_app (zip (ex_dict_args++id_args) strict_marks) i3 [] @@ -412,13 +439,16 @@ mkRecordSelId tycon field_label unpack_id unpackUtf8_id mkFunTy data_ty field_tau arity = 1 + n_dict_tys + n_field_dict_tys - info = noCafNoTyGenIdInfo - `setCgInfo` (CgInfo arity caf_info) - `setArityInfo` arity - `setUnfoldingInfo` unfolding - -- ToDo: consider adding further IdInfo - unfolding = mkTopUnfolding sel_rhs + (strict_sig, rhs_w_str) = dmdAnalTopRhs sel_rhs + -- Use the demand analyser to work out strictness. + -- With all this unpackery it's not easy! + + info = noCafNoTyGenIdInfo + `setCafInfo` caf_info + `setArityInfo` arity + `setUnfoldingInfo` mkTopUnfolding rhs_w_str + `setAllStrictnessInfo` Just strict_sig -- Allocate Ids. We do it a funny way round because field_dict_tys is -- almost always empty. Also note that we use length_tycon_theta @@ -447,15 +477,23 @@ mkRecordSelId tycon field_label unpack_id unpackUtf8_id mkLams dict_ids $ mkLams field_dict_ids $ Lam data_id $ sel_body - sel_body | isNewTyCon tycon = mkNewTypeBody tycon field_tau data_id + sel_body | isNewTyCon tycon = mkNewTypeBody tycon field_tau (mk_result data_id) | otherwise = Case (Var data_id) data_id (default_alt ++ the_alts) + mk_result result_id = mkVarApps (mkVarApps (Var result_id) field_tyvars) field_dict_ids + -- We pull the field lambdas to the top, so we need to + -- apply them in the body. For example: + -- data T = MkT { foo :: forall a. a->a } + -- + -- foo :: forall a. T -> a -> a + -- foo = /\a. \t:T. case t of { MkT f -> f a } + mk_maybe_alt data_con = case maybe_the_arg_id of Nothing -> Nothing Just the_arg_id -> Just (DataAlt data_con, real_args, mkLets binds body) where - body = mkVarApps (mkVarApps (Var the_arg_id) field_tyvars) field_dict_ids + body = mk_result the_arg_id strict_marks = dataConStrictMarks data_con (binds, real_args) = rebuildConArgs arg_ids strict_marks (map mkBuiltinUnique [unpack_base..]) @@ -513,8 +551,8 @@ rebuildConArgs (arg:args) (str:stricts) us (_, tycon_args, pack_con, con_arg_tys) = splitProductType "rebuildConArgs" arg_ty - unpacked_args = zipWith (mkSysLocal SLIT("rb")) us con_arg_tys - (binds, args') = rebuildConArgs args stricts (drop (length con_arg_tys) us) + unpacked_args = zipWith (mkSysLocal FSLIT("rb")) us con_arg_tys + (binds, args') = rebuildConArgs args stricts (dropList con_arg_tys us) con_app = mkConApp pack_con (map Type tycon_args ++ map Var unpacked_args) in (NonRec arg con_app : binds, unpacked_args ++ args') @@ -552,14 +590,21 @@ mkDictSelId name clas tag = assoc "MkId.mkDictSelId" (map idName (classSelIds clas) `zip` allFieldLabelTags) name info = noCafNoTyGenIdInfo - `setCgArity` 1 - `setArityInfo` 1 - `setUnfoldingInfo` unfolding - + `setArityInfo` 1 + `setUnfoldingInfo` mkTopUnfolding rhs + `setAllStrictnessInfo` Just strict_sig + -- We no longer use 'must-inline' on record selectors. They'll -- inline like crazy if they scrutinise a constructor - unfolding = mkTopUnfolding rhs + -- The strictness signature is of the form U(AAAVAAAA) -> T + -- where the V depends on which item we are selecting + -- It's worth giving one, so that absence info etc is generated + -- even if the selector isn't inlined + strict_sig = mkStrictSig (mkTopDmdType [arg_dmd] TopRes) + arg_dmd | isNewTyCon tycon = evalDmd + | otherwise = Eval (Prod [ if the_arg_id == id then evalDmd else Abs + | id <- arg_ids ]) tyvars = classTyVars clas @@ -573,16 +618,18 @@ mkDictSelId name clas (dict_id:arg_ids) = mkTemplateLocals (mkPredTy pred : arg_tys) rhs | isNewTyCon tycon = mkLams tyvars $ Lam dict_id $ - mkNewTypeBody tycon (head arg_tys) dict_id + mkNewTypeBody tycon (head arg_tys) (Var dict_id) | otherwise = mkLams tyvars $ Lam dict_id $ Case (Var dict_id) dict_id [(DataAlt data_con, arg_ids, Var the_arg_id)] -mkNewTypeBody tycon result_ty result_id +mkNewTypeBody tycon result_ty result_expr + -- Adds a coerce where necessary + -- Used for both wrapping and unwrapping | isRecursiveTyCon tycon -- Recursive case; use a coerce - = Note (Coerce result_ty (idType result_id)) (Var result_id) + = Note (Coerce result_ty (exprType result_expr)) result_expr | otherwise -- Normal case - = Var result_id + = result_expr \end{code} @@ -597,20 +644,17 @@ mkPrimOpId :: PrimOp -> Id mkPrimOpId prim_op = id where - (tyvars,arg_tys,res_ty, arity, strict_info) = primOpSig prim_op + (tyvars,arg_tys,res_ty, arity, strict_sig) = primOpSig prim_op ty = mkForAllTys tyvars (mkFunTys arg_tys res_ty) name = mkPrimOpIdName prim_op id = mkGlobalId (PrimOpId prim_op) name ty info info = noCafNoTyGenIdInfo `setSpecInfo` rules - `setCgArity` arity `setArityInfo` arity - `setStrictnessInfo` strict_info - `setNewStrictnessInfo` mkNewStrictnessInfo id arity strict_info NoCPRInfo + `setAllStrictnessInfo` Just strict_sig - rules = maybe emptyCoreRules (addRule emptyCoreRules id) - (primOpRule prim_op) + rules = foldl (addRule id) emptyCoreRules (primOpRules prim_op) -- For each ccall we manufacture a separate CCallOpId, giving it @@ -627,9 +671,8 @@ mkFCallId uniq fcall ty = ASSERT( isEmptyVarSet (tyVarsOfType ty) ) -- A CCallOpId should have no free type variables; -- when doing substitutions won't substitute over it - id + mkGlobalId (FCallId fcall) name ty info where - id = mkGlobalId (FCallId fcall) name ty info occ_str = showSDocIface (braces (ppr fcall <+> ppr ty)) -- The "occurrence name" of a ccall is the full info about the -- ccall; it is encoded, but may have embedded spaces etc! @@ -637,15 +680,13 @@ mkFCallId uniq fcall ty name = mkFCallName uniq occ_str info = noCafNoTyGenIdInfo - `setCgArity` arity - `setArityInfo` arity - `setStrictnessInfo` strict_info - `setNewStrictnessInfo` mkNewStrictnessInfo id arity strict_info NoCPRInfo + `setArityInfo` arity + `setAllStrictnessInfo` Just strict_sig (_, tau) = tcSplitForAllTys ty (arg_tys, _) = tcSplitFunTys tau arity = length arg_tys - strict_info = mkStrictnessInfo (take arity (repeat wwPrim), False) + strict_sig = mkStrictSig (mkTopDmdType (replicate arity evalDmd) TopRes) \end{code} @@ -655,9 +696,34 @@ mkFCallId uniq fcall ty %* * %************************************************************************ +Important notes about dict funs and default methods +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Dict funs and default methods are *not* ImplicitIds. Their definition +involves user-written code, so we can't figure out their strictness etc +based on fixed info, as we can for constructors and record selectors (say). + +We build them as GlobalIds, but when in the module where they are +bound, we turn the Id at the *binding site* into an exported LocalId. +This ensures that they are taken to account by free-variable finding +and dependency analysis (e.g. CoreFVs.exprFreeVars). The simplifier +will propagate the LocalId to all occurrence sites. + +Why shouldn't they be bound as GlobalIds? Because, in particular, if +they are globals, the specialiser floats dict uses above their defns, +which prevents good simplifications happening. Also the strictness +analyser treats a occurrence of a GlobalId as imported and assumes it +contains strictness in its IdInfo, which isn't true if the thing is +bound in the same module as the occurrence. + +It's OK for dfuns to be LocalIds, because we form the instance-env to +pass on to the next module (md_insts) in CoreTidy, afer tidying +and globalising the top-level Ids. + +BUT make sure they are *exported* LocalIds (setIdLocalExported) so +that they aren't discarded by the occurrence analyser. + \begin{code} -mkDefaultMethodId dm_name ty - = mkVanillaGlobal dm_name ty noCafNoTyGenIdInfo +mkDefaultMethodId dm_name ty = mkVanillaGlobal dm_name ty noCafNoTyGenIdInfo mkDictFunId :: Name -- Name to use for the dict fun; -> Class @@ -707,7 +773,12 @@ mkDictFunId dfun_name clas inst_tyvars inst_tys dfun_theta %* * %************************************************************************ -These two can't be defined in Haskell. +These Ids can't be defined in Haskell. They could be defined in +unfoldings in PrelGHC.hi-boot, but we'd have to ensure that they +were definitely, definitely inlined, because there is no curried +identifier for them. That's what mkCompulsoryUnfolding does. +If we had a way to get a compulsory unfolding from an interface file, +we could do that, but we don't right now. unsafeCoerce# isn't so much a PrimOp as a phantom identifier, that just gets expanded into a type coercion wherever it occurs. Hence we @@ -718,8 +789,9 @@ they can unify with both unlifted and lifted types. Hence we provide another gun with which to shoot yourself in the foot. \begin{code} +-- unsafeCoerce# :: forall a b. a -> b unsafeCoerceId - = pcMiscPrelId unsafeCoerceIdKey pREL_GHC SLIT("unsafeCoerce#") ty info + = pcMiscPrelId unsafeCoerceIdKey gHC_PRIM FSLIT("unsafeCoerce#") ty info where info = noCafNoTyGenIdInfo `setUnfoldingInfo` mkCompulsoryUnfolding rhs @@ -729,15 +801,34 @@ unsafeCoerceId [x] = mkTemplateLocals [openAlphaTy] rhs = mkLams [openAlphaTyVar,openBetaTyVar,x] $ Note (Coerce openBetaTy openAlphaTy) (Var x) -\end{code} +-- nullAddr# :: Addr# +-- The reason is is here is because we don't provide +-- a way to write this literal in Haskell. +nullAddrId + = pcMiscPrelId nullAddrIdKey gHC_PRIM FSLIT("nullAddr#") addrPrimTy info + where + info = noCafNoTyGenIdInfo `setUnfoldingInfo` + mkCompulsoryUnfolding (Lit nullAddrLit) + +seqId + = pcMiscPrelId seqIdKey gHC_PRIM FSLIT("seq") ty info + where + info = noCafNoTyGenIdInfo `setUnfoldingInfo` mkCompulsoryUnfolding rhs + + + ty = mkForAllTys [alphaTyVar,betaTyVar] + (mkFunTy alphaTy (mkFunTy betaTy betaTy)) + [x,y] = mkTemplateLocals [alphaTy, betaTy] + rhs = mkLams [alphaTyVar,betaTyVar,x,y] (Case (Var x) x [(DEFAULT, [], Var y)]) +\end{code} @getTag#@ is another function which can't be defined in Haskell. It needs to evaluate its argument and call the dataToTag# primitive. \begin{code} getTagId - = pcMiscPrelId getTagIdKey pREL_GHC SLIT("getTag#") ty info + = pcMiscPrelId getTagIdKey gHC_PRIM FSLIT("getTag#") ty info where info = noCafNoTyGenIdInfo `setUnfoldingInfo` mkCompulsoryUnfolding rhs -- We don't provide a defn for this; you must inline it @@ -753,15 +844,25 @@ dataToTagId = mkPrimOpId DataToTagOp @realWorld#@ used to be a magic literal, \tr{void#}. If things get nasty as-is, change it back to a literal (@Literal@). +voidArgId is a Local Id used simply as an argument in functions +where we just want an arg to avoid having a thunk of unlifted type. +E.g. + x = \ void :: State# RealWorld -> (# p, q #) + +This comes up in strictness analysis + \begin{code} realWorldPrimId -- :: State# RealWorld - = pcMiscPrelId realWorldPrimIdKey pREL_GHC SLIT("realWorld#") + = pcMiscPrelId realWorldPrimIdKey gHC_PRIM FSLIT("realWorld#") realWorldStatePrimTy (noCafNoTyGenIdInfo `setUnfoldingInfo` mkOtherCon []) -- The mkOtherCon makes it look that realWorld# is evaluated -- which in turn makes Simplify.interestingArg return True, -- which in turn makes INLINE things applied to realWorld# likely -- to be inlined + +voidArgId -- :: State# RealWorld + = mkSysLocal FSLIT("void") voidArgIdKey realWorldStatePrimTy \end{code} @@ -788,28 +889,31 @@ templates, but we don't ever expect to generate code for it. \begin{code} eRROR_ID - = pc_bottoming_Id errorIdKey pREL_ERR SLIT("error") errorTy + = pc_bottoming_Id errorIdKey pREL_ERR FSLIT("error") errorTy +eRROR_CSTRING_ID + = pc_bottoming_Id errorCStringIdKey pREL_ERR FSLIT("errorCString") + (mkSigmaTy [openAlphaTyVar] [] (mkFunTy addrPrimTy openAlphaTy)) pAT_ERROR_ID - = generic_ERROR_ID patErrorIdKey SLIT("patError") + = generic_ERROR_ID patErrorIdKey FSLIT("patError") rEC_SEL_ERROR_ID - = generic_ERROR_ID recSelErrIdKey SLIT("recSelError") + = generic_ERROR_ID recSelErrIdKey FSLIT("recSelError") rEC_CON_ERROR_ID - = generic_ERROR_ID recConErrorIdKey SLIT("recConError") + = generic_ERROR_ID recConErrorIdKey FSLIT("recConError") rEC_UPD_ERROR_ID - = generic_ERROR_ID recUpdErrorIdKey SLIT("recUpdError") + = generic_ERROR_ID recUpdErrorIdKey FSLIT("recUpdError") iRREFUT_PAT_ERROR_ID - = generic_ERROR_ID irrefutPatErrorIdKey SLIT("irrefutPatError") + = generic_ERROR_ID irrefutPatErrorIdKey FSLIT("irrefutPatError") nON_EXHAUSTIVE_GUARDS_ERROR_ID - = generic_ERROR_ID nonExhaustiveGuardsErrorIdKey SLIT("nonExhaustiveGuardsError") + = generic_ERROR_ID nonExhaustiveGuardsErrorIdKey FSLIT("nonExhaustiveGuardsError") nO_METHOD_BINDING_ERROR_ID - = generic_ERROR_ID noMethodBindingErrorIdKey SLIT("noMethodBindingError") + = generic_ERROR_ID noMethodBindingErrorIdKey FSLIT("noMethodBindingError") aBSENT_ERROR_ID - = pc_bottoming_Id absentErrorIdKey pREL_ERR SLIT("absentErr") + = pc_bottoming_Id absentErrorIdKey pREL_ERR FSLIT("absentErr") (mkSigmaTy [openAlphaTyVar] [] openAlphaTy) pAR_ERROR_ID - = pcMiscPrelId parErrorIdKey pREL_ERR SLIT("parError") + = pcMiscPrelId parErrorIdKey pREL_ERR FSLIT("parError") (mkSigmaTy [openAlphaTyVar] [] openAlphaTy) noCafNoTyGenIdInfo \end{code} @@ -835,15 +939,10 @@ pcMiscPrelId key mod str ty info -- will be in "the right place" to be in scope. pc_bottoming_Id key mod name ty - = id + = pcMiscPrelId key mod name ty bottoming_info where - id = pcMiscPrelId key mod name ty bottoming_info - strict_info = mkStrictnessInfo ([wwStrict], True) - bottoming_info = noCafNoTyGenIdInfo - `setStrictnessInfo` strict_info - `setNewStrictnessInfo` mkNewStrictnessInfo id 1 strict_info NoCPRInfo - - + strict_sig = mkStrictSig (mkTopDmdType [evalDmd] BotRes) + bottoming_info = noCafNoTyGenIdInfo `setAllStrictnessInfo` Just strict_sig -- these "bottom" out, no matter what their arguments generic_ERROR_ID u n = pc_bottoming_Id u pREL_ERR n errorTy