\begin{code}
module MkId (
mkDictFunId, mkDefaultMethodId,
- mkDictSelId,
+ mkDictSelId,
- mkDataConId, mkDataConWrapId,
- mkRecordSelId, rebuildConArgs,
+ mkDataConIds,
+ mkRecordSelId,
mkPrimOpId, mkFCallId,
+ mkReboxingAlt, mkNewTypeBody,
+
-- And some particular Ids; see below for why they are wired in
- wiredInIds,
- unsafeCoerceId, realWorldPrimId, 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
+ wiredInIds, ghcPrimIds,
+ unsafeCoerceId, realWorldPrimId, voidArgId, nullAddrId, seqId,
+ lazyId, lazyIdUnfolding, lazyIdKey,
+
+ mkRuntimeErrorApp,
+ rEC_CON_ERROR_ID, iRREFUT_PAT_ERROR_ID, rUNTIME_ERROR_ID,
+ nON_EXHAUSTIVE_GUARDS_ERROR_ID, nO_METHOD_BINDING_ERROR_ID,
+ pAT_ERROR_ID, eRROR_ID
) where
#include "HsVersions.h"
import BasicTypes ( Arity, StrictnessMark(..), isMarkedUnboxed, isMarkedStrict )
-import TysPrim ( openAlphaTyVars, alphaTyVar, alphaTy, betaTyVar, betaTy,
- intPrimTy, realWorldStatePrimTy, addrPrimTy
+import TysPrim ( openAlphaTyVars, alphaTyVar, alphaTy,
+ realWorldStatePrimTy, addrPrimTy
)
import TysWiredIn ( charTy, mkListTy )
import PrelRules ( primOpRules )
import Rules ( addRule )
-import TcType ( Type, ThetaType, mkDictTy, mkPredTys, mkTyConApp,
- mkTyVarTys, mkClassPred, tcEqPred,
+import Type ( TyThing(..) )
+import TcType ( Type, ThetaType, mkDictTy, mkPredTys, mkPredTy,
+ mkTyConApp, mkTyVarTys, mkClassPred, tcEqPred,
mkFunTys, mkFunTy, mkSigmaTy, tcSplitSigmaTy,
isUnLiftedType, mkForAllTys, mkTyVarTy, tyVarsOfType,
- tcSplitFunTys, tcSplitForAllTys, mkPredTy
+ tcSplitFunTys, tcSplitForAllTys
)
-import Module ( Module )
-import CoreUtils ( mkInlineMe )
+import CoreUtils ( exprType )
import CoreUnfold ( mkTopUnfolding, mkCompulsoryUnfolding, mkOtherCon )
-import Literal ( Literal(..), nullAddrLit )
+import Literal ( nullAddrLit, mkStringLit )
import TyCon ( TyCon, isNewTyCon, tyConTyVars, tyConDataCons,
- tyConTheta, isProductTyCon, isDataTyCon, isRecursiveTyCon )
-import Class ( Class, classTyCon, classTyVars, classSelIds )
-import Var ( Id, TyVar )
+ tyConStupidTheta, isProductTyCon, isDataTyCon, isRecursiveTyCon )
+import Class ( Class, classTyCon, classSelIds )
+import Var ( Id, TyVar, Var )
import VarSet ( isEmptyVarSet )
-import Name ( mkWiredInName, mkFCallName, Name )
-import OccName ( mkVarOcc )
-import PrimOp ( PrimOp(DataToTagOp), primOpSig, mkPrimOpIdName )
+import Name ( mkFCallName, mkWiredInName, Name, BuiltInSyntax(..) )
+import OccName ( mkOccFS, varName )
+import PrimOp ( PrimOp, primOpSig, primOpOcc, primOpTag )
import ForeignCall ( ForeignCall )
-import DataCon ( DataCon,
- dataConFieldLabels, dataConRepArity, dataConTyCon,
- dataConArgTys, dataConRepType,
- dataConInstOrigArgTys,
- dataConName, dataConTheta,
- dataConSig, dataConStrictMarks, dataConId,
- splitProductType
- )
-import Id ( idType, mkGlobalId, mkVanillaGlobal, mkSysLocal,
- mkTemplateLocals, mkTemplateLocalsNum,
- mkTemplateLocal, idNewStrictness, idName
+import DataCon ( DataCon, DataConIds(..), dataConTyVars,
+ dataConFieldLabels, dataConRepArity,
+ dataConRepArgTys, dataConRepType,
+ dataConStupidTheta, dataConOrigArgTys,
+ dataConSig, dataConStrictMarks, dataConExStricts,
+ splitProductType, isVanillaDataCon
)
-import IdInfo ( IdInfo, noCafNoTyGenIdInfo,
- setUnfoldingInfo,
- setArityInfo, setSpecInfo, setCgInfo,
- mkNewStrictnessInfo, setNewStrictnessInfo,
- GlobalIdDetails(..), CafInfo(..), CprInfo(..),
- CgInfo(..), setCgArity
+import Id ( idType, mkGlobalId, mkVanillaGlobal, mkSysLocal,
+ mkTemplateLocals, mkTemplateLocalsNum, mkExportedLocalId,
+ mkTemplateLocal, idName
)
-import NewDemand ( mkStrictSig, strictSigResInfo, DmdResult(..),
- mkTopDmdType, topDmd, evalDmd, Demand(..), Keepity(..) )
-import FieldLabel ( mkFieldLabel, fieldLabelName,
- firstFieldLabelTag, allFieldLabelTags, fieldLabelType
+import IdInfo ( IdInfo, noCafIdInfo, setUnfoldingInfo,
+ setArityInfo, setSpecInfo, setCafInfo,
+ setAllStrictnessInfo, vanillaIdInfo,
+ GlobalIdDetails(..), CafInfo(..)
)
+import NewDemand ( mkStrictSig, DmdResult(..),
+ mkTopDmdType, topDmd, evalDmd, lazyDmd, retCPR,
+ Demand(..), Demands(..) )
import DmdAnal ( dmdAnalTopRhs )
import CoreSyn
-import Unique ( mkBuiltinUnique )
+import Unique ( mkBuiltinUnique, mkPrimOpIdUnique )
import Maybes
import PrelNames
import Maybe ( isJust )
+import Util ( dropList, isSingleton )
import Outputable
+import FastString
import ListSetOps ( assoc, assocMaybe )
-import UnicodeUtil ( stringToUtf8 )
-import Char ( ord )
+import List ( nubBy )
\end{code}
%************************************************************************
--
-- [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
- , 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
-
- -- These can't be defined in Haskell, but they have
+ -- error-reporting functions that they have an 'open'
+ -- result type. -- sof 1/99]
+
+ eRROR_ID, -- This one isn't used anywhere else in the compiler
+ -- But we still need it in wiredInIds so that when GHC
+ -- compiles a program that mentions 'error' we don't
+ -- import its type from the interface file; we just get
+ -- the Id defined here. Which has an 'open-tyvar' type.
+
+ rUNTIME_ERROR_ID,
+ iRREFUT_PAT_ERROR_ID,
+ nON_EXHAUSTIVE_GUARDS_ERROR_ID,
+ nO_METHOD_BINDING_ERROR_ID,
+ pAT_ERROR_ID,
+ rEC_CON_ERROR_ID,
+
+ lazyId
+ ] ++ 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
+ realWorldPrimId,
+ unsafeCoerceId,
+ nullAddrId,
+ seqId
]
\end{code}
%* *
%************************************************************************
-\begin{code}
-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
- = mkGlobalId (DataConId data_con) work_name (dataConRepType data_con) info
- where
- info = noCafNoTyGenIdInfo
- `setCgArity` arity
- `setArityInfo` arity
- `setNewStrictnessInfo` 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 = 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
-mAX_CPR_SIZE = 10
--- We do not treat very big tuples as CPR-ish:
--- a) for a start we get into trouble because there aren't
--- "enough" unboxed tuple types (a tiresome restriction,
--- but hard to fix),
--- b) more importantly, big unboxed tuples get returned mainly
--- on the stack, and are often then allocated in the heap
--- by the caller. So doing CPR for them may in fact make
--- things worse.
-\end{code}
-
The wrapper for a constructor is an ordinary top-level binding that evaluates
any strict args, unboxes any args that are going to be flattened, and calls
the worker.
Making an explicit case expression allows the simplifier to eliminate
it in the (common) case where the constructor arg is already evaluated.
+
\begin{code}
-mkDataConWrapId data_con
- = mkGlobalId (DataConWrapId data_con) (dataConName data_con) wrap_ty info
+mkDataConIds :: Name -> Name -> DataCon -> DataConIds
+ -- Makes the *worker* for the data constructor; that is, the function
+ -- that takes the reprsentation arguments and builds the constructor.
+mkDataConIds wrap_name wkr_name data_con
+ | isNewTyCon tycon
+ = NewDC nt_wrap_id
+
+ | any isMarkedStrict all_strict_marks -- Algebraic, needs wrapper
+ = AlgDC (Just alg_wrap_id) wrk_id
+
+ | otherwise -- Algebraic, no wrapper
+ = AlgDC Nothing wrk_id
where
- work_id = dataConId data_con
+ (tyvars, theta, orig_arg_tys, tycon, res_tys) = dataConSig data_con
+
+ dict_tys = mkPredTys theta
+ all_arg_tys = dict_tys ++ orig_arg_tys
+ result_ty = mkTyConApp tycon res_tys
+
+ wrap_ty = mkForAllTys tyvars (mkFunTys all_arg_tys result_ty)
+ -- We used to include the stupid theta in the wrapper's args
+ -- but now we don't. Instead the type checker just injects these
+ -- extra constraints where necessary.
- info = noCafNoTyGenIdInfo
- `setUnfoldingInfo` mkTopUnfolding (mkInlineMe wrap_rhs)
- `setCgArity` arity
- -- 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` Just wrap_sig
+ ----------- Worker (algebraic data types only) --------------
+ wrk_id = mkGlobalId (DataConWorkId data_con) wkr_name
+ (dataConRepType data_con) wkr_info
- wrap_ty = mkForAllTys all_tyvars (mkFunTys all_arg_tys result_ty)
+ wkr_arity = dataConRepArity data_con
+ wkr_info = noCafIdInfo
+ `setArityInfo` wkr_arity
+ `setAllStrictnessInfo` Just wkr_sig
- res_info = strictSigResInfo (idNewStrictness work_id)
- wrap_sig = mkStrictSig (mkTopDmdType (replicate arity topDmd) res_info)
+ wkr_sig = mkStrictSig (mkTopDmdType (replicate wkr_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.
+
+ cpr_info | isProductTyCon tycon &&
+ isDataTyCon tycon &&
+ wkr_arity > 0 &&
+ wkr_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
+
+ ----------- Wrappers for newtypes --------------
+ nt_wrap_id = mkGlobalId (DataConWrapId data_con) wrap_name wrap_ty nt_wrap_info
+ nt_wrap_info = noCafIdInfo -- The NoCaf-ness is set by noCafIdInfo
+ `setArityInfo` 1 -- Arity 1
+ `setUnfoldingInfo` newtype_unf
+ newtype_unf = ASSERT( isVanillaDataCon data_con &&
+ 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 $ Lam id_arg1 $
+ mkNewTypeBody tycon result_ty (Var id_arg1)
+
+ id_arg1 = mkTemplateLocal 1 (head orig_arg_tys)
+
+ ----------- Wrappers for algebraic data types --------------
+ alg_wrap_id = mkGlobalId (DataConWrapId data_con) wrap_name wrap_ty alg_wrap_info
+ alg_wrap_info = noCafIdInfo -- The NoCaf-ness is set by noCafIdInfo
+ `setArityInfo` alg_arity
+ -- It's important to specify the arity, so that partial
+ -- applications are treated as values
+ `setUnfoldingInfo` alg_unf
+ `setAllStrictnessInfo` Just wrap_sig
+
+ all_strict_marks = dataConExStricts data_con ++ dataConStrictMarks data_con
+ wrap_sig = mkStrictSig (mkTopDmdType arg_dmds cpr_info)
+ arg_dmds = map mk_dmd all_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
- -- But we are sloppy about the argument demands, because we expect
- -- to inline the constructor very vigorously.
-
- wrap_rhs | isNewTyCon tycon
- = ASSERT( null ex_tyvars && null ex_dict_args && length orig_arg_tys == 1 )
- -- No existentials on a newtype, but it can have a context
- -- e.g. newtype Eq a => T a = MkT (...)
- mkLams tyvars $ mkLams dict_args $ Lam id_arg1 $
- mkNewTypeBody tycon result_ty 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.)
- --
- -- 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.
- -- 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 $
- mkLams ex_dict_args $ mkLams id_args $
- foldr mk_case con_app
- (zip (ex_dict_args++id_args) strict_marks) i3 []
-
- con_app i rep_ids = mkApps (Var work_id)
- (map varToCoreExpr (all_tyvars ++ reverse rep_ids))
-
- (tyvars, theta, ex_tyvars, ex_theta, orig_arg_tys, tycon) = dataConSig data_con
- all_tyvars = tyvars ++ ex_tyvars
-
- dict_tys = mkPredTys theta
- ex_dict_tys = mkPredTys ex_theta
- all_arg_tys = dict_tys ++ ex_dict_tys ++ orig_arg_tys
- result_ty = mkTyConApp tycon (mkTyVarTys tyvars)
-
- mkLocals i tys = (zipWith mkTemplateLocal [i..i+n-1] tys, i+n)
- where
- n = length tys
-
- (dict_args, i1) = mkLocals 1 dict_tys
- (ex_dict_args,i2) = mkLocals i1 ex_dict_tys
- (id_args,i3) = mkLocals i2 orig_arg_tys
- arity = i3-1
- (id_arg1:_) = id_args -- Used for newtype only
-
- strict_marks = dataConStrictMarks data_con
+ -- 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
+
+ alg_unf = mkTopUnfolding $ Note InlineMe $
+ mkLams tyvars $
+ mkLams dict_args $ mkLams id_args $
+ foldr mk_case con_app
+ (zip (dict_args ++ id_args) all_strict_marks)
+ i3 []
+
+ con_app i rep_ids = mkApps (Var wrk_id)
+ (map varToCoreExpr (tyvars ++ reverse rep_ids))
+
+ (dict_args,i2) = mkLocals 1 dict_tys
+ (id_args,i3) = mkLocals i2 orig_arg_tys
+ alg_arity = i3-1
mk_case
:: (Id, StrictnessMark) -- Arg, strictness
MarkedStrict
| isUnLiftedType (idType arg) -> body i (arg:rep_args)
| otherwise ->
- Case (Var arg) arg [(DEFAULT,[], body i (arg:rep_args))]
+-- gaw 2004
+ Case (Var arg) arg result_ty [(DEFAULT,[], body i (arg:rep_args))]
MarkedUnboxed
-> case splitProductType "do_unbox" (idType arg) of
(tycon, tycon_args, con, tys) ->
- Case (Var arg) arg [(DataAlt con, con_args,
+-- gaw 2004
+ Case (Var arg) arg result_ty [(DataAlt con, con_args,
body i' (reverse con_args ++ rep_args))]
where
(con_args, i') = mkLocals i tys
+
+mAX_CPR_SIZE :: Arity
+mAX_CPR_SIZE = 10
+-- We do not treat very big tuples as CPR-ish:
+-- a) for a start we get into trouble because there aren't
+-- "enough" unboxed tuple types (a tiresome restriction,
+-- but hard to fix),
+-- b) more importantly, big unboxed tuples get returned mainly
+-- on the stack, and are often then allocated in the heap
+-- by the caller. So doing CPR for them may in fact make
+-- things worse.
+
+mkLocals i tys = (zipWith mkTemplateLocal [i..i+n-1] tys, i+n)
+ where
+ n = length tys
\end{code}
(not f :: R -> forall a. a->a, which gives the type inference mechanism
problems at call sites)
-Similarly for newtypes
+Similarly for (recursive) newtypes
newtype N = MkN { unN :: forall a. a->a }
- unN :: forall a. N -> a -> a
- unN = /\a -> \n:N -> coerce (a->a) n
+ unN :: forall b. N -> b -> b
+ unN = /\b -> \n:N -> (coerce (forall a. a->a) n)
\begin{code}
-mkRecordSelId tycon field_label unpack_id unpackUtf8_id
+mkRecordSelId tycon field_label field_ty
-- Assumes that all fields with the same field label have the same type
- --
- -- Annoyingly, we have to pass in the unpackCString# Id, because
- -- we can't conjure it up out of thin air
= sel_id
where
- sel_id = mkGlobalId (RecordSelId field_label) (fieldLabelName field_label) selector_ty info
- field_ty = fieldLabelType field_label
+ sel_id = mkGlobalId (RecordSelId tycon field_label) field_label selector_ty info
data_cons = tyConDataCons tycon
tyvars = tyConTyVars tycon -- These scope over the types in
-- the FieldLabels of constructors of this type
data_ty = mkTyConApp tycon tyvar_tys
tyvar_tys = mkTyVarTys tyvars
- tycon_theta = tyConTheta tycon -- The context on the data decl
- -- eg data (Eq a, Ord b) => T a b = ...
- dict_tys = [mkPredTy pred | pred <- tycon_theta,
- needed_dict pred]
- needed_dict pred = or [ tcEqPred pred p
- | (DataAlt dc, _, _) <- the_alts, p <- dataConTheta dc]
- n_dict_tys = length dict_tys
+ -- Very tiresomely, the selectors are (unnecessarily!) overloaded over
+ -- just the dictionaries in the types of the constructors that contain
+ -- the relevant field. [The Report says that pattern matching on a
+ -- constructor gives the same constraints as applying it.] Urgh.
+ --
+ -- However, not all data cons have all constraints (because of
+ -- TcTyDecls.thinContext). So we need to find all the data cons
+ -- involved in the pattern match and take the union of their constraints.
+ --
+ -- NB: this code relies on the fact that DataCons are quantified over
+ -- the identical type variables as their parent TyCon
+ needed_preds = [pred | (DataAlt dc, _, _) <- the_alts, pred <- dataConStupidTheta dc]
+ dict_tys = mkPredTys (nubBy tcEqPred needed_preds)
+ n_dict_tys = length dict_tys
(field_tyvars,field_theta,field_tau) = tcSplitSigmaTy field_ty
- field_dict_tys = map mkPredTy field_theta
+ field_dict_tys = mkPredTys field_theta
n_field_dict_tys = length field_dict_tys
-- If the field has a universally quantified type we have to
-- be a bit careful. Suppose we have
-- Note that this is exactly the type we'd infer from a user defn
-- op (R op) = op
- -- Very tiresomely, the selectors are (unnecessarily!) overloaded over
- -- just the dictionaries in the types of the constructors that contain
- -- the relevant field. Urgh.
- -- NB: this code relies on the fact that DataCons are quantified over
- -- the identical type variables as their parent TyCon
-
selector_ty :: Type
selector_ty = mkForAllTys tyvars $ mkForAllTys field_tyvars $
mkFunTys dict_tys $ mkFunTys field_dict_tys $
-- Use the demand analyser to work out strictness.
-- With all this unpackery it's not easy!
- info = noCafNoTyGenIdInfo
- `setCgInfo` CgInfo arity caf_info
+ info = noCafIdInfo
+ `setCafInfo` caf_info
`setArityInfo` arity
`setUnfoldingInfo` mkTopUnfolding rhs_w_str
- `setNewStrictnessInfo` Just strict_sig
+ `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
+ -- almost always empty. Also note that we use max_dict_tys
-- rather than n_dict_tys, because the latter gives an infinite loop:
-- n_dict tys depends on the_alts, which depens on arg_ids, which depends
-- on arity, which depends on n_dict tys. Sigh! Mega sigh!
- field_dict_base = length tycon_theta + 1
- dict_id_base = field_dict_base + n_field_dict_tys
- field_base = dict_id_base + 1
- dict_ids = mkTemplateLocalsNum 1 dict_tys
- field_dict_ids = mkTemplateLocalsNum field_dict_base field_dict_tys
- data_id = mkTemplateLocal dict_id_base data_ty
+ dict_ids = mkTemplateLocalsNum 1 dict_tys
+ max_dict_tys = length (tyConStupidTheta tycon)
+ field_dict_base = max_dict_tys + 1
+ field_dict_ids = mkTemplateLocalsNum field_dict_base field_dict_tys
+ dict_id_base = field_dict_base + n_field_dict_tys
+ data_id = mkTemplateLocal dict_id_base data_ty
+ arg_base = dict_id_base + 1
alts = map mk_maybe_alt data_cons
the_alts = catMaybes alts
default_alt | no_default = []
| otherwise = [(DEFAULT, [], error_expr)]
- -- the default branch may have CAF refs, because it calls recSelError etc.
+ -- The default branch may have CAF refs, because it calls recSelError etc.
caf_info | no_default = NoCafRefs
| otherwise = MayHaveCafRefs
mkLams dict_ids $ mkLams field_dict_ids $
Lam data_id $ sel_body
- sel_body | isNewTyCon tycon = mkNewTypeBody tycon field_tau data_id
- | otherwise = Case (Var data_id) data_id (default_alt ++ the_alts)
+ sel_body | isNewTyCon tycon = mk_result (mkNewTypeBody tycon field_ty (Var data_id))
+ | otherwise = Case (Var data_id) data_id field_tau (default_alt ++ the_alts)
+
+ mk_result poly_result = mkVarApps (mkVarApps poly_result 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
+ = ASSERT( dc_tyvars == tyvars )
+ -- The only non-vanilla case we allow is when we have an existential
+ -- context that binds no type variables, thus
+ -- data T a = (?v::Int) => MkT a
+ -- In the non-vanilla case, the pattern must bind type variables and
+ -- the context stuff; hence the arg_prefix binding below
+
+ 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
- strict_marks = dataConStrictMarks data_con
- (binds, real_args) = rebuildConArgs arg_ids strict_marks
- (map mkBuiltinUnique [unpack_base..])
+ Just the_arg_id -> Just (mkReboxingAlt uniqs data_con (arg_prefix ++ arg_src_ids) $
+ mk_result (Var the_arg_id))
where
- arg_ids = mkTemplateLocalsNum field_base (dataConInstOrigArgTys data_con tyvar_tys)
+ (dc_tyvars, dc_theta, dc_arg_tys, _, _) = dataConSig data_con
+ arg_src_ids = mkTemplateLocalsNum arg_base dc_arg_tys
+ arg_base' = arg_base + length arg_src_ids
+ arg_prefix | isVanillaDataCon data_con = []
+ | otherwise = tyvars ++ mkTemplateLocalsNum arg_base' (mkPredTys dc_theta)
- unpack_base = field_base + length arg_ids
+ unpack_base = arg_base' + length dc_theta
+ uniqs = map mkBuiltinUnique [unpack_base..]
- -- arity+1 avoids all shadowing
- maybe_the_arg_id = assocMaybe (field_lbls `zip` arg_ids) field_label
+ maybe_the_arg_id = assocMaybe (field_lbls `zip` arg_src_ids) field_label
field_lbls = dataConFieldLabels data_con
- error_expr = mkApps (Var rEC_SEL_ERROR_ID) [Type field_tau, err_string]
- err_string
- | all safeChar full_msg
- = App (Var unpack_id) (Lit (MachStr (_PK_ full_msg)))
- | otherwise
- = App (Var unpackUtf8_id) (Lit (MachStr (_PK_ (stringToUtf8 (map ord full_msg)))))
- where
- safeChar c = c >= '\1' && c <= '\xFF'
- -- TODO: Putting this Unicode stuff here is ugly. Find a better
- -- generic place to make string literals. This logic is repeated
- -- in DsUtils.
+ error_expr = mkRuntimeErrorApp rEC_SEL_ERROR_ID field_tau full_msg
full_msg = showSDoc (sep [text "No match in record selector", ppr sel_id])
--- This rather ugly function converts the unpacked data con
--- arguments back into their packed form.
-
-rebuildConArgs
- :: [Id] -- Source-level args
- -> [StrictnessMark] -- Strictness annotations (per-arg)
- -> [Unique] -- Uniques for the new Ids
- -> ([CoreBind], [Id]) -- A binding for each source-level arg, plus
- -- a list of the representation-level arguments
--- e.g. data T = MkT Int !Int
+-- (mkReboxingAlt us con xs rhs) basically constructs the case
+-- alternative (con, xs, rhs)
+-- but it does the reboxing necessary to construct the *source*
+-- arguments, xs, from the representation arguments ys.
+-- For example:
+-- data T = MkT !(Int,Int) Bool
+--
+-- mkReboxingAlt MkT [x,b] r
+-- = (DataAlt MkT, [y::Int,z::Int,b], let x = (y,z) in r)
--
--- rebuild [x::Int, y::Int] [Not, Unbox]
--- = ([ y = I# t ], [x,t])
+-- mkDataAlt should really be in DataCon, but it can't because
+-- it manipulates CoreSyn.
-rebuildConArgs [] stricts us = ([], [])
+mkReboxingAlt
+ :: [Unique] -- Uniques for the new Ids
+ -> DataCon
+ -> [Var] -- Source-level args, including existential dicts
+ -> CoreExpr -- RHS
+ -> CoreAlt
--- Type variable case
-rebuildConArgs (arg:args) stricts us
- | isTyVar arg
- = let (binds, args') = rebuildConArgs args stricts us
- in (binds, arg:args')
+mkReboxingAlt us con args rhs
+ | not (any isMarkedUnboxed stricts)
+ = (DataAlt con, args, rhs)
--- Term variable case
-rebuildConArgs (arg:args) (str:stricts) us
- | isMarkedUnboxed str
+ | otherwise
= let
- arg_ty = idType arg
-
- (_, 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)
- con_app = mkConApp pack_con (map Type tycon_args ++ map Var unpacked_args)
+ (binds, args') = go args stricts us
in
- (NonRec arg con_app : binds, unpacked_args ++ args')
+ (DataAlt con, args', mkLets binds rhs)
- | otherwise
- = let (binds, args') = rebuildConArgs args stricts us
- in (binds, arg:args')
+ where
+ stricts = dataConExStricts con ++ dataConStrictMarks con
+
+ go [] stricts us = ([], [])
+
+ -- Type variable case
+ go (arg:args) stricts us
+ | isTyVar arg
+ = let (binds, args') = go args stricts us
+ in (binds, arg:args')
+
+ -- Term variable case
+ go (arg:args) (str:stricts) us
+ | isMarkedUnboxed str
+ = let
+ (_, tycon_args, pack_con, con_arg_tys)
+ = splitProductType "mkReboxingAlt" (idType arg)
+
+ unpacked_args = zipWith (mkSysLocal FSLIT("rb")) us con_arg_tys
+ (binds, args') = go 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')
+
+ | otherwise
+ = let (binds, args') = go args stricts us
+ in (binds, arg:args')
\end{code}
Selecting a field for a dictionary. If there is just one field, then
there's nothing to do.
-ToDo: unify with mkRecordSelId.
+Dictionary selectors may get nested forall-types. Thus:
+
+ class Foo a where
+ op :: forall b. Ord b => a -> b -> b
+
+Then the top-level type for op is
+
+ op :: forall a. Foo a =>
+ forall b. Ord b =>
+ a -> b -> b
+
+This is unlike ordinary record selectors, which have all the for-alls
+at the outside. When dealing with classes it's very convenient to
+recover the original type signature from the class op selector.
\begin{code}
mkDictSelId :: Name -> Class -> Id
mkDictSelId name clas
- = mkGlobalId (RecordSelId field_lbl) name sel_ty info
+ = mkGlobalId (ClassOpId clas) name sel_ty info
where
sel_ty = mkForAllTys tyvars (mkFunTy (idType dict_id) (idType the_arg_id))
-- We can't just say (exprType rhs), because that would give a type
-- But it's type must expose the representation of the dictionary
-- to gat (say) C a -> (a -> a)
- field_lbl = mkFieldLabel name tycon sel_ty tag
- tag = assoc "MkId.mkDictSelId" (map idName (classSelIds clas) `zip` allFieldLabelTags) name
-
- info = noCafNoTyGenIdInfo
- `setCgArity` 1
+ info = noCafIdInfo
`setArityInfo` 1
`setUnfoldingInfo` mkTopUnfolding rhs
- `setNewStrictnessInfo` Just strict_sig
+ `setAllStrictnessInfo` Just strict_sig
-- We no longer use 'must-inline' on record selectors. They'll
-- inline like crazy if they scrutinise a constructor
-- 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 = Eval
- | otherwise = Seq Drop [ if the_arg_id == id then Eval else Abs
- | id <- arg_ids ]
-
- tyvars = classTyVars clas
+ arg_dmd | isNewTyCon tycon = evalDmd
+ | otherwise = Eval (Prod [ if the_arg_id == id then evalDmd else Abs
+ | id <- arg_ids ])
tycon = classTyCon clas
[data_con] = tyConDataCons tycon
- tyvar_tys = mkTyVarTys tyvars
- arg_tys = dataConArgTys data_con tyvar_tys
- the_arg_id = arg_ids !! (tag - firstFieldLabelTag)
+ tyvars = dataConTyVars data_con
+ arg_tys = dataConRepArgTys data_con
+ the_arg_id = assoc "MkId.mkDictSelId" (map idName (classSelIds clas) `zip` arg_ids) name
- pred = mkClassPred clas tyvar_tys
+ pred = mkClassPred clas (mkTyVarTys tyvars)
(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
+ Case (Var dict_id) dict_id (idType the_arg_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}
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
+ name = mkWiredInName gHC_PRIM (primOpOcc prim_op)
+ (mkPrimOpIdUnique (primOpTag prim_op))
+ Nothing (AnId id) UserSyntax
id = mkGlobalId (PrimOpId prim_op) name ty info
- info = noCafNoTyGenIdInfo
+ info = noCafIdInfo
`setSpecInfo` rules
- `setCgArity` arity
`setArityInfo` arity
- `setNewStrictnessInfo` Just (mkNewStrictnessInfo id arity strict_info NoCPRInfo)
- -- Until we modify the primop generation code
+ `setAllStrictnessInfo` Just strict_sig
rules = foldl (addRule id) emptyCoreRules (primOpRules prim_op)
-- when doing substitutions won't substitute over it
mkGlobalId (FCallId fcall) name ty info
where
- occ_str = showSDocIface (braces (ppr fcall <+> ppr ty))
+ occ_str = showSDoc (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!
name = mkFCallName uniq occ_str
- info = noCafNoTyGenIdInfo
- `setCgArity` arity
+ info = noCafIdInfo
`setArityInfo` arity
- `setNewStrictnessInfo` Just strict_sig
+ `setAllStrictnessInfo` Just strict_sig
(_, tau) = tcSplitForAllTys ty
(arg_tys, _) = tcSplitFunTys tau
that they aren't discarded by the occurrence analyser.
\begin{code}
-mkDefaultMethodId dm_name ty = mkVanillaGlobal dm_name ty noCafNoTyGenIdInfo
+mkDefaultMethodId dm_name ty = mkExportedLocalId dm_name ty
mkDictFunId :: Name -- Name to use for the dict fun;
- -> Class
-> [TyVar]
- -> [Type]
-> ThetaType
+ -> Class
+ -> [Type]
-> Id
-mkDictFunId dfun_name clas inst_tyvars inst_tys dfun_theta
- = mkVanillaGlobal dfun_name dfun_ty noCafNoTyGenIdInfo
+mkDictFunId dfun_name inst_tyvars dfun_theta clas inst_tys
+ = mkExportedLocalId dfun_name dfun_ty
where
dfun_ty = mkSigmaTy inst_tyvars dfun_theta (mkDictTy clas inst_tys)
(class_tyvars, sc_theta, _, _) = classBigSig clas
not_const (clas, tys) = not (isEmptyVarSet (tyVarsOfTypes tys))
- sc_theta' = substClasses (mkTopTyVarSubst class_tyvars inst_tys) sc_theta
+ sc_theta' = substClasses (zipTopTvSubst class_tyvars inst_tys) sc_theta
dfun_theta = case inst_decl_theta of
[] -> [] -- If inst_decl_theta is empty, then we don't
-- want to have any dict arguments, so that we can
%* *
%************************************************************************
-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.
+These Ids can't be defined in Haskell. They could be defined in
+unfoldings in the wired-in GHC.Prim interface file, 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
another gun with which to shoot yourself in the foot.
\begin{code}
+mkWiredInIdName mod fs uniq id
+ = mkWiredInName mod (mkOccFS varName fs) uniq Nothing (AnId id) UserSyntax
+
+unsafeCoerceName = mkWiredInIdName gHC_PRIM FSLIT("unsafeCoerce#") unsafeCoerceIdKey unsafeCoerceId
+nullAddrName = mkWiredInIdName gHC_PRIM FSLIT("nullAddr#") nullAddrIdKey nullAddrId
+seqName = mkWiredInIdName gHC_PRIM FSLIT("seq") seqIdKey seqId
+realWorldName = mkWiredInIdName gHC_PRIM FSLIT("realWorld#") realWorldPrimIdKey realWorldPrimId
+lazyIdName = mkWiredInIdName pREL_BASE FSLIT("lazy") lazyIdKey lazyId
+
+errorName = mkWiredInIdName pREL_ERR FSLIT("error") errorIdKey eRROR_ID
+recSelErrorName = mkWiredInIdName pREL_ERR FSLIT("recSelError") recSelErrorIdKey rEC_SEL_ERROR_ID
+runtimeErrorName = mkWiredInIdName pREL_ERR FSLIT("runtimeError") runtimeErrorIdKey rUNTIME_ERROR_ID
+irrefutPatErrorName = mkWiredInIdName pREL_ERR FSLIT("irrefutPatError") irrefutPatErrorIdKey iRREFUT_PAT_ERROR_ID
+recConErrorName = mkWiredInIdName pREL_ERR FSLIT("recConError") recConErrorIdKey rEC_CON_ERROR_ID
+patErrorName = mkWiredInIdName pREL_ERR FSLIT("patError") patErrorIdKey pAT_ERROR_ID
+noMethodBindingErrorName = mkWiredInIdName pREL_ERR FSLIT("noMethodBindingError")
+ noMethodBindingErrorIdKey nO_METHOD_BINDING_ERROR_ID
+nonExhaustiveGuardsErrorName
+ = mkWiredInIdName pREL_ERR FSLIT("nonExhaustiveGuardsError")
+ nonExhaustiveGuardsErrorIdKey nON_EXHAUSTIVE_GUARDS_ERROR_ID
+\end{code}
+
+\begin{code}
-- unsafeCoerce# :: forall a b. a -> b
unsafeCoerceId
- = pcMiscPrelId unsafeCoerceIdKey pREL_GHC SLIT("unsafeCoerce#") ty info
+ = pcMiscPrelId unsafeCoerceName ty info
where
- info = noCafNoTyGenIdInfo `setUnfoldingInfo` mkCompulsoryUnfolding rhs
+ info = noCafIdInfo `setUnfoldingInfo` mkCompulsoryUnfolding rhs
ty = mkForAllTys [openAlphaTyVar,openBetaTyVar]
-- The reason is is here is because we don't provide
-- a way to write this literal in Haskell.
nullAddrId
- = pcMiscPrelId nullAddrIdKey pREL_GHC SLIT("nullAddr#") addrPrimTy info
+ = pcMiscPrelId nullAddrName addrPrimTy info
where
- info = noCafNoTyGenIdInfo `setUnfoldingInfo`
+ info = noCafIdInfo `setUnfoldingInfo`
mkCompulsoryUnfolding (Lit nullAddrLit)
seqId
- = pcMiscPrelId seqIdKey pREL_GHC SLIT("seq") ty info
+ = pcMiscPrelId seqName ty info
where
- info = noCafNoTyGenIdInfo `setUnfoldingInfo` mkCompulsoryUnfolding rhs
+ info = noCafIdInfo `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
+ ty = mkForAllTys [alphaTyVar,openBetaTyVar]
+ (mkFunTy alphaTy (mkFunTy openBetaTy openBetaTy))
+ [x,y] = mkTemplateLocals [alphaTy, openBetaTy]
+-- gaw 2004
+ rhs = mkLams [alphaTyVar,openBetaTyVar,x,y] (Case (Var x) x openBetaTy [(DEFAULT, [], Var y)])
+
+-- lazy :: forall a?. a? -> a? (i.e. works for unboxed types too)
+-- Used to lazify pseq: pseq a b = a `seq` lazy b
+-- No unfolding: it gets "inlined" by the worker/wrapper pass
+-- Also, no strictness: by being a built-in Id, it overrides all
+-- the info in PrelBase.hi. This is important, because the strictness
+-- analyser will spot it as strict!
+lazyId
+ = pcMiscPrelId lazyIdName ty info
where
- info = noCafNoTyGenIdInfo `setUnfoldingInfo` mkCompulsoryUnfolding rhs
- -- We don't provide a defn for this; you must inline it
-
- ty = mkForAllTys [alphaTyVar] (mkFunTy alphaTy intPrimTy)
- [x,y] = mkTemplateLocals [alphaTy,alphaTy]
- rhs = mkLams [alphaTyVar,x] $
- Case (Var x) y [ (DEFAULT, [], mkApps (Var dataToTagId) [Type alphaTy, Var y]) ]
+ info = noCafIdInfo
+ ty = mkForAllTys [alphaTyVar] (mkFunTy alphaTy alphaTy)
-dataToTagId = mkPrimOpId DataToTagOp
+lazyIdUnfolding :: CoreExpr -- Used to expand LazyOp after strictness anal
+lazyIdUnfolding = mkLams [openAlphaTyVar,x] (Var x)
+ where
+ [x] = mkTemplateLocals [openAlphaTy]
\end{code}
@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#")
- realWorldStatePrimTy
- (noCafNoTyGenIdInfo `setUnfoldingInfo` mkOtherCon [])
+ = pcMiscPrelId realWorldName realWorldStatePrimTy
+ (noCafIdInfo `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}
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
-eRROR_CSTRING_ID
- = pc_bottoming_Id errorCStringIdKey pREL_ERR SLIT("errorCString")
- (mkSigmaTy [openAlphaTyVar] [] (mkFunTy addrPrimTy openAlphaTy))
-pAT_ERROR_ID
- = generic_ERROR_ID patErrorIdKey SLIT("patError")
-rEC_SEL_ERROR_ID
- = generic_ERROR_ID recSelErrIdKey SLIT("recSelError")
-rEC_CON_ERROR_ID
- = generic_ERROR_ID recConErrorIdKey SLIT("recConError")
-rEC_UPD_ERROR_ID
- = generic_ERROR_ID recUpdErrorIdKey SLIT("recUpdError")
-iRREFUT_PAT_ERROR_ID
- = generic_ERROR_ID irrefutPatErrorIdKey SLIT("irrefutPatError")
-nON_EXHAUSTIVE_GUARDS_ERROR_ID
- = generic_ERROR_ID nonExhaustiveGuardsErrorIdKey SLIT("nonExhaustiveGuardsError")
-nO_METHOD_BINDING_ERROR_ID
- = generic_ERROR_ID noMethodBindingErrorIdKey SLIT("noMethodBindingError")
-
-aBSENT_ERROR_ID
- = pc_bottoming_Id absentErrorIdKey pREL_ERR SLIT("absentErr")
- (mkSigmaTy [openAlphaTyVar] [] openAlphaTy)
-
-pAR_ERROR_ID
- = pcMiscPrelId parErrorIdKey pREL_ERR SLIT("parError")
- (mkSigmaTy [openAlphaTyVar] [] openAlphaTy) noCafNoTyGenIdInfo
+mkRuntimeErrorApp
+ :: Id -- Should be of type (forall a. Addr# -> a)
+ -- where Addr# points to a UTF8 encoded string
+ -> Type -- The type to instantiate 'a'
+ -> String -- The string to print
+ -> CoreExpr
+
+mkRuntimeErrorApp err_id res_ty err_msg
+ = mkApps (Var err_id) [Type res_ty, err_string]
+ where
+ err_string = Lit (mkStringLit err_msg)
+
+rEC_SEL_ERROR_ID = mkRuntimeErrorId recSelErrorName
+rUNTIME_ERROR_ID = mkRuntimeErrorId runtimeErrorName
+iRREFUT_PAT_ERROR_ID = mkRuntimeErrorId irrefutPatErrorName
+rEC_CON_ERROR_ID = mkRuntimeErrorId recConErrorName
+pAT_ERROR_ID = mkRuntimeErrorId patErrorName
+nO_METHOD_BINDING_ERROR_ID = mkRuntimeErrorId noMethodBindingErrorName
+nON_EXHAUSTIVE_GUARDS_ERROR_ID = mkRuntimeErrorId nonExhaustiveGuardsErrorName
+
+-- The runtime error Ids take a UTF8-encoded string as argument
+mkRuntimeErrorId name = pc_bottoming_Id name runtimeErrorTy
+runtimeErrorTy = mkSigmaTy [openAlphaTyVar] [] (mkFunTy addrPrimTy openAlphaTy)
+\end{code}
+
+\begin{code}
+eRROR_ID = pc_bottoming_Id errorName errorTy
+
+errorTy :: Type
+errorTy = mkSigmaTy [openAlphaTyVar] [] (mkFunTys [mkListTy charTy] openAlphaTy)
+ -- Notice the openAlphaTyVar. It says that "error" can be applied
+ -- to unboxed as well as boxed types. This is OK because it never
+ -- returns, so the return type is irrelevant.
\end{code}
%************************************************************************
\begin{code}
-pcMiscPrelId :: Unique{-IdKey-} -> Module -> FAST_STRING -> Type -> IdInfo -> Id
-pcMiscPrelId key mod str ty info
- = let
- name = mkWiredInName mod (mkVarOcc str) key
- imp = mkVanillaGlobal name ty info -- the usual case...
- in
- imp
+pcMiscPrelId :: Name -> Type -> IdInfo -> Id
+pcMiscPrelId name ty info
+ = mkVanillaGlobal name ty info
-- We lie and say the thing is imported; otherwise, we get into
-- a mess with dependency analysis; e.g., core2stg may heave in
-- random calls to GHCbase.unpackPS__. If GHCbase is the module
-- being compiled, then it's just a matter of luck if the definition
-- will be in "the right place" to be in scope.
-pc_bottoming_Id key mod name ty
- = pcMiscPrelId key mod name ty bottoming_info
+pc_bottoming_Id name ty
+ = pcMiscPrelId name ty bottoming_info
where
- strict_sig = mkStrictSig (mkTopDmdType [evalDmd] BotRes)
- bottoming_info = noCafNoTyGenIdInfo `setNewStrictnessInfo` Just strict_sig
- -- these "bottom" out, no matter what their arguments
+ bottoming_info = vanillaIdInfo `setAllStrictnessInfo` Just strict_sig
+ -- Do *not* mark them as NoCafRefs, because they can indeed have
+ -- CAF refs. For example, pAT_ERROR_ID calls GHC.Err.untangle,
+ -- which has some CAFs
+ -- In due course we may arrange that these error-y things are
+ -- regarded by the GC as permanently live, in which case we
+ -- can give them NoCaf info. As it is, any function that calls
+ -- any pc_bottoming_Id will itself have CafRefs, which bloats
+ -- SRTs.
-generic_ERROR_ID u n = pc_bottoming_Id u pREL_ERR n errorTy
+ strict_sig = mkStrictSig (mkTopDmdType [evalDmd] BotRes)
+ -- These "bottom" out, no matter what their arguments
(openAlphaTyVar:openBetaTyVar:_) = openAlphaTyVars
openAlphaTy = mkTyVarTy openAlphaTyVar
openBetaTy = mkTyVarTy openBetaTyVar
-
-errorTy :: Type
-errorTy = mkSigmaTy [openAlphaTyVar] [] (mkFunTys [mkListTy charTy]
- openAlphaTy)
- -- Notice the openAlphaTyVar. It says that "error" can be applied
- -- to unboxed as well as boxed types. This is OK because it never
- -- returns, so the return type is irrelevant.
\end{code}
projects / ghc-hetmet.git / blobdiff