2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[Id]{@Ids@: Value and constructor identifiers}
10 -- Simple construction
11 mkGlobalId, mkLocalId, mkSpecPragmaId, mkLocalIdWithInfo,
12 mkSysLocal, mkSysLocalUnencoded, mkUserLocal, mkVanillaGlobal,
13 mkTemplateLocals, mkTemplateLocalsNum, mkWildId, mkTemplateLocal,
17 idName, idType, idUnique, idInfo,
18 idPrimRep, isId, globalIdDetails,
19 recordSelectorFieldLabel,
22 setIdName, setIdUnique, setIdType, setIdLocalExported, setGlobalIdDetails,
23 setIdInfo, lazySetIdInfo, modifyIdInfo, maybeModifyIdInfo,
24 zapLamIdInfo, zapDemandIdInfo,
27 isImplicitId, isDeadBinder,
28 isSpecPragmaId, isExportedId, isLocalId, isGlobalId,
30 isPrimOpId, isPrimOpId_maybe,
31 isFCallId, isFCallId_maybe,
32 isDataConWorkId, isDataConWorkId_maybe,
33 isBottomingId, idIsFrom,
36 -- Inline pragma stuff
37 idInlinePragma, setInlinePragma, modifyInlinePragma,
40 -- One shot lambda stuff
41 isOneShotLambda, setOneShotLambda, clearOneShotLambda,
47 setIdNewStrictness, zapIdNewStrictness,
63 idNewDemandInfo, idNewDemandInfo_maybe,
64 idNewStrictness, idNewStrictness_maybe,
67 idSpecialisation, idCoreRules,
73 newStrictnessFromOld -- Temporary
78 #include "HsVersions.h"
81 import CoreSyn ( Unfolding, CoreRules, IdCoreRule, rulesRules )
82 import BasicTypes ( Arity )
83 import Var ( Id, DictId,
84 isId, isExportedId, isSpecPragmaId, isLocalId,
85 idName, idType, idUnique, idInfo, isGlobalId,
86 setIdName, setVarType, setIdUnique, setIdLocalExported,
87 setIdInfo, lazySetIdInfo, modifyIdInfo,
89 globalIdDetails, setGlobalIdDetails
91 import qualified Var ( mkLocalId, mkGlobalId, mkSpecPragmaId )
92 import Type ( Type, typePrimRep, addFreeTyVars, seqType)
97 import qualified Demand ( Demand )
99 import DataCon ( isUnboxedTupleCon )
100 import NewDemand ( Demand, StrictSig, topDmd, topSig, isBottomingSig )
101 import Name ( Name, OccName, nameIsLocalOrFrom,
102 mkSystemName, mkSystemNameEncoded, mkInternalName,
103 getOccName, getSrcLoc
105 import Module ( Module )
106 import OccName ( EncodedFS, mkWorkerOcc )
107 import PrimRep ( PrimRep )
108 import FieldLabel ( FieldLabel )
109 import Maybes ( orElse )
110 import SrcLoc ( SrcLoc )
112 import Unique ( Unique, mkBuiltinUnique )
114 -- infixl so you can say (id `set` a `set` b)
115 infixl 1 `setIdUnfolding`,
117 `setIdNewDemandInfo`,
118 `setIdNewStrictness`,
120 `setIdSpecialisation`,
123 #ifdef OLD_STRICTNESS
132 %************************************************************************
134 \subsection{Simple Id construction}
136 %************************************************************************
138 Absolutely all Ids are made by mkId. It is just like Var.mkId,
139 but in addition it pins free-tyvar-info onto the Id's type,
140 where it can easily be found.
143 mkLocalIdWithInfo :: Name -> Type -> IdInfo -> Id
144 mkLocalIdWithInfo name ty info = Var.mkLocalId name (addFreeTyVars ty) info
146 mkSpecPragmaId :: Name -> Type -> Id
147 mkSpecPragmaId name ty = Var.mkSpecPragmaId name (addFreeTyVars ty) vanillaIdInfo
149 mkGlobalId :: GlobalIdDetails -> Name -> Type -> IdInfo -> Id
150 mkGlobalId details name ty info = Var.mkGlobalId details name (addFreeTyVars ty) info
154 mkLocalId :: Name -> Type -> Id
155 mkLocalId name ty = mkLocalIdWithInfo name ty vanillaIdInfo
157 -- SysLocal: for an Id being created by the compiler out of thin air...
158 -- UserLocal: an Id with a name the user might recognize...
159 mkUserLocal :: OccName -> Unique -> Type -> SrcLoc -> Id
160 mkSysLocal :: EncodedFS -> Unique -> Type -> Id
161 mkVanillaGlobal :: Name -> Type -> IdInfo -> Id
163 -- for SysLocal, we assume the base name is already encoded, to avoid
164 -- re-encoding the same string over and over again.
165 mkSysLocal fs uniq ty = mkLocalId (mkSystemNameEncoded uniq fs) ty
167 -- version to use when the faststring needs to be encoded
168 mkSysLocalUnencoded fs uniq ty = mkLocalId (mkSystemName uniq fs) ty
170 mkUserLocal occ uniq ty loc = mkLocalId (mkInternalName uniq occ loc) ty
171 mkVanillaGlobal = mkGlobalId VanillaGlobal
174 Make some local @Ids@ for a template @CoreExpr@. These have bogus
175 @Uniques@, but that's OK because the templates are supposed to be
176 instantiated before use.
179 -- "Wild Id" typically used when you need a binder that you don't expect to use
180 mkWildId :: Type -> Id
181 mkWildId ty = mkSysLocal FSLIT("wild") (mkBuiltinUnique 1) ty
183 mkWorkerId :: Unique -> Id -> Type -> Id
184 -- A worker gets a local name. CoreTidy will externalise it if necessary.
185 mkWorkerId uniq unwrkr ty
186 = mkLocalId wkr_name ty
188 wkr_name = mkInternalName uniq (mkWorkerOcc (getOccName unwrkr)) (getSrcLoc unwrkr)
190 -- "Template locals" typically used in unfoldings
191 mkTemplateLocals :: [Type] -> [Id]
192 mkTemplateLocals tys = zipWith mkTemplateLocal [1..] tys
194 mkTemplateLocalsNum :: Int -> [Type] -> [Id]
195 -- The Int gives the starting point for unique allocation
196 mkTemplateLocalsNum n tys = zipWith mkTemplateLocal [n..] tys
198 mkTemplateLocal :: Int -> Type -> Id
199 mkTemplateLocal i ty = mkSysLocal FSLIT("tpl") (mkBuiltinUnique i) ty
203 %************************************************************************
205 \subsection[Id-general-funs]{General @Id@-related functions}
207 %************************************************************************
210 setIdType :: Id -> Type -> Id
211 -- Add free tyvar info to the type
212 setIdType id ty = seqType ty `seq` setVarType id (addFreeTyVars ty)
214 idPrimRep :: Id -> PrimRep
215 idPrimRep id = typePrimRep (idType id)
219 %************************************************************************
221 \subsection{Special Ids}
223 %************************************************************************
225 The @SpecPragmaId@ exists only to make Ids that are
226 on the *LHS* of bindings created by SPECIALISE pragmas;
228 The SpecPragmaId is never itself mentioned; it
229 exists solely so that the specialiser will find
230 the call to f, and make specialised version of it.
231 The SpecPragmaId binding is discarded by the specialiser
232 when it gathers up overloaded calls.
233 Meanwhile, it is not discarded as dead code.
237 recordSelectorFieldLabel :: Id -> FieldLabel
238 recordSelectorFieldLabel id = case globalIdDetails id of
239 RecordSelId lbl -> lbl
240 other -> panic "recordSelectorFieldLabel"
242 isRecordSelector id = case globalIdDetails id of
243 RecordSelId lbl -> True
246 isPrimOpId id = case globalIdDetails id of
250 isPrimOpId_maybe id = case globalIdDetails id of
251 PrimOpId op -> Just op
254 isFCallId id = case globalIdDetails id of
258 isFCallId_maybe id = case globalIdDetails id of
259 FCallId call -> Just call
262 isDataConWorkId id = case globalIdDetails id of
263 DataConWorkId _ -> True
266 isDataConWorkId_maybe id = case globalIdDetails id of
267 DataConWorkId con -> Just con
270 -- hasNoBinding returns True of an Id which may not have a
271 -- binding, even though it is defined in this module.
272 -- Data constructor workers used to be things of this kind, but
273 -- they aren't any more. Instead, we inject a binding for
274 -- them at the CorePrep stage.
275 -- EXCEPT: unboxed tuples, which definitely have no binding
276 hasNoBinding id = case globalIdDetails id of
279 DataConWorkId dc -> isUnboxedTupleCon dc
282 isImplicitId :: Id -> Bool
283 -- isImplicitId tells whether an Id's info is implied by other
284 -- declarations, so we don't need to put its signature in an interface
285 -- file, even if it's mentioned in some other interface unfolding.
287 = case globalIdDetails id of
288 RecordSelId _ -> True
292 DataConWorkId _ -> True
293 DataConWrapId _ -> True
294 -- These are are implied by their type or class decl;
295 -- remember that all type and class decls appear in the interface file.
296 -- The dfun id is not an implicit Id; it must *not* be omitted, because
297 -- it carries version info for the instance decl
300 idIsFrom :: Module -> Id -> Bool
301 idIsFrom mod id = nameIsLocalOrFrom mod (idName id)
305 isDeadBinder :: Id -> Bool
306 isDeadBinder bndr | isId bndr = isDeadOcc (idOccInfo bndr)
307 | otherwise = False -- TyVars count as not dead
311 %************************************************************************
313 \subsection{IdInfo stuff}
315 %************************************************************************
318 ---------------------------------
320 idArity :: Id -> Arity
321 idArity id = arityInfo (idInfo id)
323 setIdArity :: Id -> Arity -> Id
324 setIdArity id arity = modifyIdInfo (`setArityInfo` arity) id
326 #ifdef OLD_STRICTNESS
327 ---------------------------------
329 idStrictness :: Id -> StrictnessInfo
330 idStrictness id = strictnessInfo (idInfo id)
332 setIdStrictness :: Id -> StrictnessInfo -> Id
333 setIdStrictness id strict_info = modifyIdInfo (`setStrictnessInfo` strict_info) id
336 -- isBottomingId returns true if an application to n args would diverge
337 isBottomingId :: Id -> Bool
338 isBottomingId id = isBottomingSig (idNewStrictness id)
340 idNewStrictness_maybe :: Id -> Maybe StrictSig
341 idNewStrictness :: Id -> StrictSig
343 idNewStrictness_maybe id = newStrictnessInfo (idInfo id)
344 idNewStrictness id = idNewStrictness_maybe id `orElse` topSig
346 setIdNewStrictness :: Id -> StrictSig -> Id
347 setIdNewStrictness id sig = modifyIdInfo (`setNewStrictnessInfo` Just sig) id
349 zapIdNewStrictness :: Id -> Id
350 zapIdNewStrictness id = modifyIdInfo (`setNewStrictnessInfo` Nothing) id
352 ---------------------------------
354 idWorkerInfo :: Id -> WorkerInfo
355 idWorkerInfo id = workerInfo (idInfo id)
357 setIdWorkerInfo :: Id -> WorkerInfo -> Id
358 setIdWorkerInfo id work_info = modifyIdInfo (`setWorkerInfo` work_info) id
360 ---------------------------------
362 idUnfolding :: Id -> Unfolding
363 idUnfolding id = unfoldingInfo (idInfo id)
365 setIdUnfolding :: Id -> Unfolding -> Id
366 setIdUnfolding id unfolding = modifyIdInfo (`setUnfoldingInfo` unfolding) id
368 #ifdef OLD_STRICTNESS
369 ---------------------------------
371 idDemandInfo :: Id -> Demand.Demand
372 idDemandInfo id = demandInfo (idInfo id)
374 setIdDemandInfo :: Id -> Demand.Demand -> Id
375 setIdDemandInfo id demand_info = modifyIdInfo (`setDemandInfo` demand_info) id
378 idNewDemandInfo_maybe :: Id -> Maybe NewDemand.Demand
379 idNewDemandInfo :: Id -> NewDemand.Demand
381 idNewDemandInfo_maybe id = newDemandInfo (idInfo id)
382 idNewDemandInfo id = newDemandInfo (idInfo id) `orElse` NewDemand.topDmd
384 setIdNewDemandInfo :: Id -> NewDemand.Demand -> Id
385 setIdNewDemandInfo id dmd = modifyIdInfo (`setNewDemandInfo` Just dmd) id
387 ---------------------------------
389 idSpecialisation :: Id -> CoreRules
390 idSpecialisation id = specInfo (idInfo id)
392 idCoreRules :: Id -> [IdCoreRule]
393 idCoreRules id = [(id,rule) | rule <- rulesRules (idSpecialisation id)]
395 setIdSpecialisation :: Id -> CoreRules -> Id
396 setIdSpecialisation id spec_info = modifyIdInfo (`setSpecInfo` spec_info) id
398 ---------------------------------
400 idCafInfo :: Id -> CafInfo
401 #ifdef OLD_STRICTNESS
402 idCafInfo id = case cgInfo (idInfo id) of
403 NoCgInfo -> pprPanic "idCafInfo" (ppr id)
404 info -> cgCafInfo info
406 idCafInfo id = cafInfo (idInfo id)
409 setIdCafInfo :: Id -> CafInfo -> Id
410 setIdCafInfo id caf_info = modifyIdInfo (`setCafInfo` caf_info) id
412 ---------------------------------
414 #ifdef OLD_STRICTNESS
415 idCprInfo :: Id -> CprInfo
416 idCprInfo id = cprInfo (idInfo id)
418 setIdCprInfo :: Id -> CprInfo -> Id
419 setIdCprInfo id cpr_info = modifyIdInfo (`setCprInfo` cpr_info) id
422 ---------------------------------
424 idOccInfo :: Id -> OccInfo
425 idOccInfo id = occInfo (idInfo id)
427 setIdOccInfo :: Id -> OccInfo -> Id
428 setIdOccInfo id occ_info = modifyIdInfo (`setOccInfo` occ_info) id
432 ---------------------------------
434 The inline pragma tells us to be very keen to inline this Id, but it's still
435 OK not to if optimisation is switched off.
438 idInlinePragma :: Id -> InlinePragInfo
439 idInlinePragma id = inlinePragInfo (idInfo id)
441 setInlinePragma :: Id -> InlinePragInfo -> Id
442 setInlinePragma id prag = modifyIdInfo (`setInlinePragInfo` prag) id
444 modifyInlinePragma :: Id -> (InlinePragInfo -> InlinePragInfo) -> Id
445 modifyInlinePragma id fn = modifyIdInfo (\info -> info `setInlinePragInfo` (fn (inlinePragInfo info))) id
449 ---------------------------------
452 idLBVarInfo :: Id -> LBVarInfo
453 idLBVarInfo id = lbvarInfo (idInfo id)
455 isOneShotLambda :: Id -> Bool
456 isOneShotLambda id = case idLBVarInfo id of
457 IsOneShotLambda -> True
460 setOneShotLambda :: Id -> Id
461 setOneShotLambda id = modifyIdInfo (`setLBVarInfo` IsOneShotLambda) id
463 clearOneShotLambda :: Id -> Id
464 clearOneShotLambda id
465 | isOneShotLambda id = modifyIdInfo (`setLBVarInfo` NoLBVarInfo) id
468 -- But watch out: this may change the type of something else
470 -- If we change the one-shot-ness of x, f's type changes
474 zapLamIdInfo :: Id -> Id
475 zapLamIdInfo id = maybeModifyIdInfo zapLamInfo id
477 zapDemandIdInfo id = maybeModifyIdInfo zapDemandInfo id