Id, DictId,
-- Simple construction
- mkVanillaId, mkImportedId, mkSysLocal, mkUserLocal,
- mkTemplateLocals, mkTemplateLocal, mkWildId, mkUserId,
+ mkId, mkVanillaId, mkSysLocal, mkUserLocal,
+ mkTemplateLocals, mkWildId, mkTemplateLocal,
-- Taking an Id apart
- idName, idType, idUnique, idInfo, idDetails,
+ idName, idType, idUnique, idInfo,
idPrimRep, isId,
recordSelectorFieldLabel,
-- Modifying an Id
- setIdName, setIdUnique, setIdType, setIdInfo,
+ setIdName, setIdUnique, setIdType, setIdNoDiscard,
+ setIdInfo, modifyIdInfo, maybeModifyIdInfo,
-- Predicates
omitIfaceSigForId,
+ exportWithOrigOccName,
externallyVisibleId,
idFreeTyVars,
-- Inline pragma stuff
getInlinePragma, setInlinePragma, modifyInlinePragma,
- idWantsToBeINLINEd, idMustBeINLINEd, idMustNotBeINLINEd,
- isSpecPragmaId,
-
+ idMustBeINLINEd, idMustNotBeINLINEd,
- isRecordSelector,
+ isSpecPragmaId, isRecordSelector,
isPrimitiveId_maybe, isDataConId_maybe,
- isConstantId,
- isBottomingId, idAppIsBottom,
+ isConstantId, isBottomingId, idAppIsBottom,
+ isExportedId, isUserExportedId,
+
+ -- One shot lambda stuff
+ isOneShotLambda, setOneShotLambda,
-- IdInfo stuff
setIdUnfolding,
setIdArity,
setIdDemandInfo,
setIdStrictness,
+ setIdWorkerInfo,
setIdSpecialisation,
setIdUpdateInfo,
setIdCafInfo,
+ setIdCprInfo,
getIdArity,
getIdDemandInfo,
getIdStrictness,
+ getIdWorkerInfo,
getIdUnfolding,
getIdSpecialisation,
getIdUpdateInfo,
- getIdCafInfo
+ getIdCafInfo,
+ getIdCprInfo
) where
#include "HsVersions.h"
import {-# SOURCE #-} CoreUnfold ( Unfolding )
+import {-# SOURCE #-} CoreSyn ( CoreRules )
-import Var ( Id, DictId, VarDetails(..),
- isId, mkId,
- idName, idType, idUnique, idInfo, idDetails,
- setIdName, setVarType, setIdUnique, setIdInfo, modifyIdInfo,
+import Var ( Id, DictId,
+ isId, mkIdVar,
+ idName, idType, idUnique, idInfo,
+ setIdName, setVarType, setIdUnique,
+ setIdInfo, modifyIdInfo, maybeModifyIdInfo,
externallyVisibleId
)
import VarSet
import Type ( Type, tyVarsOfType, typePrimRep, addFreeTyVars )
import IdInfo
-import Demand ( Demand )
+import Demand ( Demand, isStrict, wwLazy )
import Name ( Name, OccName,
mkSysLocalName, mkLocalName,
- isWiredInName
+ isWiredInName, isUserExportedName
)
import Const ( Con(..) )
import PrimRep ( PrimRep )
import PrimOp ( PrimOp )
+import TysPrim ( realWorldStatePrimTy )
import FieldLabel ( FieldLabel(..) )
import SrcLoc ( SrcLoc )
import Unique ( Unique, mkBuiltinUnique, getBuiltinUniques )
`setIdArity`,
`setIdDemandInfo`,
`setIdStrictness`,
+ `setIdWorkerInfo`,
`setIdSpecialisation`,
`setIdUpdateInfo`,
- `setInlinePragma`
+ `setInlinePragma`,
+ `getIdCafInfo`,
+ `getIdCprInfo`
+
-- infixl so you can say (id `set` a `set` b)
\end{code}
%* *
%************************************************************************
-\begin{code}
-mkVanillaId :: Name -> Type -> Id
-mkVanillaId name ty = mkId name (addFreeTyVars ty) VanillaId noIdInfo
+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
-mkImportedId :: Name -> Type -> IdInfo -> Id
-mkImportedId name ty info = mkId name (addFreeTyVars ty) VanillaId info
+\begin{code}
+mkId :: Name -> Type -> IdInfo -> Id
+mkId name ty info = mkIdVar name (addFreeTyVars ty) info'
+ where
+ info' | isUserExportedName name = setNoDiscardInfo info
+ | otherwise = info
+\end{code}
-mkUserId :: Name -> Type -> Id
-mkUserId name ty = mkVanillaId name ty
+\begin{code}
+mkVanillaId :: Name -> Type -> Id
+mkVanillaId name ty = mkId 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...
idPrimRep id = typePrimRep (idType 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 idDetails id of
- RecordSelId _ -> True -- Includes dictionary selectors
- ConstantId _ -> True
- -- ConstantIds 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!
-\end{code}
%************************************************************************
%* *
%************************************************************************
\begin{code}
+idFlavour :: Id -> IdFlavour
+idFlavour id = flavourInfo (idInfo id)
+
+setIdNoDiscard :: Id -> Id
+setIdNoDiscard id -- Make an Id into a NoDiscardId, unless it is already
+ = modifyIdInfo setNoDiscardInfo id
+
recordSelectorFieldLabel :: Id -> FieldLabel
-recordSelectorFieldLabel id = case idDetails id of
+recordSelectorFieldLabel id = case idFlavour id of
RecordSelId lbl -> lbl
-isRecordSelector id = case idDetails id of
+isRecordSelector id = case idFlavour id of
RecordSelId lbl -> True
other -> False
-isPrimitiveId_maybe id = case idDetails id of
+isPrimitiveId_maybe id = case idFlavour id of
ConstantId (PrimOp op) -> Just op
other -> Nothing
-isDataConId_maybe id = case idDetails id of
+isDataConId_maybe id = case idFlavour id of
ConstantId (DataCon con) -> Just con
other -> Nothing
-isConstantId id = case idDetails id of
+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;
+ -- 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!
+
+-- Certain names must be exported with their original occ names, because
+-- these names are bound by either a class declaration or a data declaration
+-- or an explicit user export.
+exportWithOrigOccName :: Id -> Bool
+exportWithOrigOccName id = omitIfaceSigForId id || isUserExportedId id
\end{code}
+
%************************************************************************
%* *
\subsection{IdInfo stuff}
getIdArity id = arityInfo (idInfo id)
setIdArity :: Id -> ArityInfo -> Id
-setIdArity id arity = modifyIdInfo id (arity `setArityInfo`)
+setIdArity id arity = modifyIdInfo (`setArityInfo` arity) id
---------------------------------
-- STRICTNESS
getIdStrictness id = strictnessInfo (idInfo id)
setIdStrictness :: Id -> StrictnessInfo -> Id
-setIdStrictness id strict_info = modifyIdInfo id (strict_info `setStrictnessInfo`)
+setIdStrictness id strict_info = modifyIdInfo (`setStrictnessInfo` strict_info) id
-- isBottomingId returns true if an application to n args would diverge
isBottomingId :: Id -> Bool
idAppIsBottom id n = appIsBottom (strictnessInfo (idInfo id)) n
---------------------------------
+ -- WORKER ID
+getIdWorkerInfo :: Id -> WorkerInfo
+getIdWorkerInfo 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)
setIdUnfolding :: Id -> Unfolding -> Id
-setIdUnfolding id unfolding = modifyIdInfo id (unfolding `setUnfoldingInfo`)
+setIdUnfolding id unfolding = modifyIdInfo (`setUnfoldingInfo` unfolding) id
---------------------------------
-- DEMAND
getIdDemandInfo id = demandInfo (idInfo id)
setIdDemandInfo :: Id -> Demand -> Id
-setIdDemandInfo id demand_info = modifyIdInfo id (demand_info `setDemandInfo`)
+setIdDemandInfo id demand_info = modifyIdInfo (`setDemandInfo` demand_info) id
---------------------------------
-- UPDATE INFO
getIdUpdateInfo id = updateInfo (idInfo id)
setIdUpdateInfo :: Id -> UpdateInfo -> Id
-setIdUpdateInfo id upd_info = modifyIdInfo id (upd_info `setUpdateInfo`)
+setIdUpdateInfo id upd_info = modifyIdInfo (`setUpdateInfo` upd_info) id
---------------------------------
-- SPECIALISATION
-getIdSpecialisation :: Id -> IdSpecEnv
+getIdSpecialisation :: Id -> CoreRules
getIdSpecialisation id = specInfo (idInfo id)
-setIdSpecialisation :: Id -> IdSpecEnv -> Id
-setIdSpecialisation id spec_info = modifyIdInfo id (spec_info `setSpecInfo`)
+setIdSpecialisation :: Id -> CoreRules -> Id
+setIdSpecialisation id spec_info = modifyIdInfo (`setSpecInfo` spec_info) id
---------------------------------
-- CAF INFO
getIdCafInfo id = cafInfo (idInfo id)
setIdCafInfo :: Id -> CafInfo -> Id
-setIdCafInfo id caf_info = modifyIdInfo id (caf_info `setCafInfo`)
+setIdCafInfo id caf_info = modifyIdInfo (`setCafInfo` caf_info) id
+
+ ---------------------------------
+ -- CPR INFO
+getIdCprInfo :: Id -> CprInfo
+getIdCprInfo id = cprInfo (idInfo id)
+
+setIdCprInfo :: Id -> CprInfo -> Id
+setIdCprInfo id cpr_info = modifyIdInfo (`setCprInfo` cpr_info) id
\end{code}
getInlinePragma id = inlinePragInfo (idInfo id)
setInlinePragma :: Id -> InlinePragInfo -> Id
-setInlinePragma id prag = modifyIdInfo id (setInlinePragInfo prag)
+setInlinePragma id prag = modifyIdInfo (`setInlinePragInfo` prag) id
modifyInlinePragma :: Id -> (InlinePragInfo -> InlinePragInfo) -> Id
-modifyInlinePragma id fn = modifyIdInfo id (\info -> setInlinePragInfo (fn (inlinePragInfo info)) info)
-
-idWantsToBeINLINEd :: Id -> Bool
-idWantsToBeINLINEd id = case getInlinePragma id of
- IWantToBeINLINEd -> True
- IMustBeINLINEd -> True
- other -> False
+modifyInlinePragma id fn = modifyIdInfo (\info -> info `setInlinePragInfo` (fn (inlinePragInfo info))) id
idMustNotBeINLINEd id = case getInlinePragma id of
IMustNotBeINLINEd -> True
- IAmASpecPragmaId -> True
IAmALoopBreaker -> True
other -> False
idMustBeINLINEd id = case getInlinePragma id of
IMustBeINLINEd -> True
other -> False
+\end{code}
+
-isSpecPragmaId id = case getInlinePragma id of
- IAmASpecPragmaId -> True
- other -> False
+ ---------------------------------
+ -- ONE-SHOT LAMBDAS
+\begin{code}
+isOneShotLambda :: Id -> Bool
+isOneShotLambda id = case lbvarInfo (idInfo id) of
+ IsOneShotLambda -> True
+ NoLBVarInfo -> idType id == realWorldStatePrimTy
+ -- 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.
+
+setOneShotLambda :: Id -> Id
+setOneShotLambda id = modifyIdInfo (`setLBVarInfo` IsOneShotLambda) id
\end{code}
projects / ghc-hetmet.git / blobdiff