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 isDataConWrapId, isDataConWrapId_maybe,
37 -- Inline pragma stuff
38 idInlinePragma, setInlinePragma, modifyInlinePragma,
41 -- One shot lambda stuff
42 isOneShotLambda, setOneShotLambda, clearOneShotLambda,
48 setIdNewStrictness, zapIdNewStrictness,
64 idNewDemandInfo, idNewDemandInfo_maybe,
65 idNewStrictness, idNewStrictness_maybe,
68 idSpecialisation, idCoreRules,
74 newStrictnessFromOld -- Temporary
79 #include "HsVersions.h"
82 import CoreSyn ( Unfolding, CoreRules, IdCoreRule, rulesRules )
83 import BasicTypes ( Arity )
84 import Var ( Id, DictId,
85 isId, isExportedId, isSpecPragmaId, isLocalId,
86 idName, idType, idUnique, idInfo, isGlobalId,
87 setIdName, setVarType, setIdUnique, setIdLocalExported,
88 setIdInfo, lazySetIdInfo, modifyIdInfo,
90 globalIdDetails, setGlobalIdDetails
92 import qualified Var ( mkLocalId, mkGlobalId, mkSpecPragmaId )
93 import Type ( Type, typePrimRep, addFreeTyVars,
94 seqType, splitTyConApp_maybe )
98 import qualified Demand ( Demand )
99 import DataCon ( isUnboxedTupleCon )
100 import NewDemand ( Demand, StrictSig, topDmd, topSig, isBottomingSig )
101 import Name ( Name, OccName,
102 mkSystemName, mkSystemNameEncoded, mkInternalName,
103 getOccName, getSrcLoc
105 import OccName ( EncodedFS, mkWorkerOcc )
106 import PrimRep ( PrimRep )
107 import FieldLabel ( FieldLabel )
108 import Maybes ( orElse )
109 import SrcLoc ( SrcLoc )
111 import Unique ( Unique, mkBuiltinUnique )
113 -- infixl so you can say (id `set` a `set` b)
114 infixl 1 `setIdUnfolding`,
116 `setIdNewDemandInfo`,
117 `setIdNewStrictness`,
119 `setIdSpecialisation`,
122 #ifdef OLD_STRICTNESS
131 %************************************************************************
133 \subsection{Simple Id construction}
135 %************************************************************************
137 Absolutely all Ids are made by mkId. It is just like Var.mkId,
138 but in addition it pins free-tyvar-info onto the Id's type,
139 where it can easily be found.
142 mkLocalIdWithInfo :: Name -> Type -> IdInfo -> Id
143 mkLocalIdWithInfo name ty info = Var.mkLocalId name (addFreeTyVars ty) info
145 mkSpecPragmaId :: Name -> Type -> Id
146 mkSpecPragmaId name ty = Var.mkSpecPragmaId name (addFreeTyVars ty) vanillaIdInfo
148 mkGlobalId :: GlobalIdDetails -> Name -> Type -> IdInfo -> Id
149 mkGlobalId details name ty info = Var.mkGlobalId details name (addFreeTyVars ty) info
153 mkLocalId :: Name -> Type -> Id
154 mkLocalId name ty = mkLocalIdWithInfo name ty vanillaIdInfo
156 -- SysLocal: for an Id being created by the compiler out of thin air...
157 -- UserLocal: an Id with a name the user might recognize...
158 mkUserLocal :: OccName -> Unique -> Type -> SrcLoc -> Id
159 mkSysLocal :: EncodedFS -> Unique -> Type -> Id
160 mkVanillaGlobal :: Name -> Type -> IdInfo -> Id
162 -- for SysLocal, we assume the base name is already encoded, to avoid
163 -- re-encoding the same string over and over again.
164 mkSysLocal fs uniq ty = mkLocalId (mkSystemNameEncoded uniq fs) ty
166 -- version to use when the faststring needs to be encoded
167 mkSysLocalUnencoded fs uniq ty = mkLocalId (mkSystemName uniq fs) ty
169 mkUserLocal occ uniq ty loc = mkLocalId (mkInternalName uniq occ loc) ty
170 mkVanillaGlobal = mkGlobalId VanillaGlobal
173 Make some local @Ids@ for a template @CoreExpr@. These have bogus
174 @Uniques@, but that's OK because the templates are supposed to be
175 instantiated before use.
178 -- "Wild Id" typically used when you need a binder that you don't expect to use
179 mkWildId :: Type -> Id
180 mkWildId ty = mkSysLocal FSLIT("wild") (mkBuiltinUnique 1) ty
182 mkWorkerId :: Unique -> Id -> Type -> Id
183 -- A worker gets a local name. CoreTidy will externalise it if necessary.
184 mkWorkerId uniq unwrkr ty
185 = mkLocalId wkr_name ty
187 wkr_name = mkInternalName uniq (mkWorkerOcc (getOccName unwrkr)) (getSrcLoc unwrkr)
189 -- "Template locals" typically used in unfoldings
190 mkTemplateLocals :: [Type] -> [Id]
191 mkTemplateLocals tys = zipWith mkTemplateLocal [1..] tys
193 mkTemplateLocalsNum :: Int -> [Type] -> [Id]
194 -- The Int gives the starting point for unique allocation
195 mkTemplateLocalsNum n tys = zipWith mkTemplateLocal [n..] tys
197 mkTemplateLocal :: Int -> Type -> Id
198 mkTemplateLocal i ty = mkSysLocal FSLIT("tpl") (mkBuiltinUnique i) ty
202 %************************************************************************
204 \subsection[Id-general-funs]{General @Id@-related functions}
206 %************************************************************************
209 setIdType :: Id -> Type -> Id
210 -- Add free tyvar info to the type
211 setIdType id ty = seqType ty `seq` setVarType id (addFreeTyVars ty)
213 idPrimRep :: Id -> PrimRep
214 idPrimRep id = typePrimRep (idType id)
218 %************************************************************************
220 \subsection{Special Ids}
222 %************************************************************************
224 The @SpecPragmaId@ exists only to make Ids that are
225 on the *LHS* of bindings created by SPECIALISE pragmas;
227 The SpecPragmaId is never itself mentioned; it
228 exists solely so that the specialiser will find
229 the call to f, and make specialised version of it.
230 The SpecPragmaId binding is discarded by the specialiser
231 when it gathers up overloaded calls.
232 Meanwhile, it is not discarded as dead code.
236 recordSelectorFieldLabel :: Id -> FieldLabel
237 recordSelectorFieldLabel id = case globalIdDetails id of
238 RecordSelId lbl -> lbl
240 isRecordSelector id = case globalIdDetails id of
241 RecordSelId lbl -> True
244 isPrimOpId id = case globalIdDetails id of
248 isPrimOpId_maybe id = case globalIdDetails id of
249 PrimOpId op -> Just op
252 isFCallId id = case globalIdDetails id of
256 isFCallId_maybe id = case globalIdDetails id of
257 FCallId call -> Just call
260 isDataConWorkId id = case globalIdDetails id of
261 DataConWorkId _ -> True
264 isDataConWorkId_maybe id = case globalIdDetails id of
265 DataConWorkId con -> Just con
268 isDataConWrapId_maybe id = case globalIdDetails id of
269 DataConWrapId con -> Just con
272 isDataConWrapId id = case globalIdDetails id of
273 DataConWrapId con -> True
276 -- hasNoBinding returns True of an Id which may not have a
277 -- binding, even though it is defined in this module.
278 -- Data constructor workers used to be things of this kind, but
279 -- they aren't any more. Instead, we inject a binding for
280 -- them at the CorePrep stage.
281 -- EXCEPT: unboxed tuples, which definitely have no binding
282 hasNoBinding id = case globalIdDetails id of
285 DataConWorkId dc -> isUnboxedTupleCon dc
288 isImplicitId :: Id -> Bool
289 -- isImplicitId tells whether an Id's info is implied by other
290 -- declarations, so we don't need to put its signature in an interface
291 -- file, even if it's mentioned in some other interface unfolding.
293 = case globalIdDetails id of
294 RecordSelId _ -> True
298 GenericOpId _ -> True
299 DataConWorkId _ -> True
300 DataConWrapId _ -> True
301 -- These are are implied by their type or class decl;
302 -- remember that all type and class decls appear in the interface file.
303 -- The dfun id is not an implicit Id; it must *not* be omitted, because
304 -- it carries version info for the instance decl
309 isDeadBinder :: Id -> Bool
310 isDeadBinder bndr | isId bndr = isDeadOcc (idOccInfo bndr)
311 | otherwise = False -- TyVars count as not dead
315 %************************************************************************
317 \subsection{IdInfo stuff}
319 %************************************************************************
322 ---------------------------------
324 idArity :: Id -> Arity
325 idArity id = arityInfo (idInfo id)
327 setIdArity :: Id -> Arity -> Id
328 setIdArity id arity = modifyIdInfo (`setArityInfo` arity) id
330 #ifdef OLD_STRICTNESS
331 ---------------------------------
333 idStrictness :: Id -> StrictnessInfo
334 idStrictness id = strictnessInfo (idInfo id)
336 setIdStrictness :: Id -> StrictnessInfo -> Id
337 setIdStrictness id strict_info = modifyIdInfo (`setStrictnessInfo` strict_info) id
340 -- isBottomingId returns true if an application to n args would diverge
341 isBottomingId :: Id -> Bool
342 isBottomingId id = isBottomingSig (idNewStrictness id)
344 idNewStrictness_maybe :: Id -> Maybe StrictSig
345 idNewStrictness :: Id -> StrictSig
347 idNewStrictness_maybe id = newStrictnessInfo (idInfo id)
348 idNewStrictness id = idNewStrictness_maybe id `orElse` topSig
350 setIdNewStrictness :: Id -> StrictSig -> Id
351 setIdNewStrictness id sig = modifyIdInfo (`setNewStrictnessInfo` Just sig) id
353 zapIdNewStrictness :: Id -> Id
354 zapIdNewStrictness id = modifyIdInfo (`setNewStrictnessInfo` Nothing) id
356 ---------------------------------
358 idWorkerInfo :: Id -> WorkerInfo
359 idWorkerInfo id = workerInfo (idInfo id)
361 setIdWorkerInfo :: Id -> WorkerInfo -> Id
362 setIdWorkerInfo id work_info = modifyIdInfo (`setWorkerInfo` work_info) id
364 ---------------------------------
366 idUnfolding :: Id -> Unfolding
367 idUnfolding id = unfoldingInfo (idInfo id)
369 setIdUnfolding :: Id -> Unfolding -> Id
370 setIdUnfolding id unfolding = modifyIdInfo (`setUnfoldingInfo` unfolding) id
372 #ifdef OLD_STRICTNESS
373 ---------------------------------
375 idDemandInfo :: Id -> Demand.Demand
376 idDemandInfo id = demandInfo (idInfo id)
378 setIdDemandInfo :: Id -> Demand.Demand -> Id
379 setIdDemandInfo id demand_info = modifyIdInfo (`setDemandInfo` demand_info) id
382 idNewDemandInfo_maybe :: Id -> Maybe NewDemand.Demand
383 idNewDemandInfo :: Id -> NewDemand.Demand
385 idNewDemandInfo_maybe id = newDemandInfo (idInfo id)
386 idNewDemandInfo id = newDemandInfo (idInfo id) `orElse` NewDemand.topDmd
388 setIdNewDemandInfo :: Id -> NewDemand.Demand -> Id
389 setIdNewDemandInfo id dmd = modifyIdInfo (`setNewDemandInfo` Just dmd) id
391 ---------------------------------
393 idSpecialisation :: Id -> CoreRules
394 idSpecialisation id = specInfo (idInfo id)
396 idCoreRules :: Id -> [IdCoreRule]
397 idCoreRules id = [(id,rule) | rule <- rulesRules (idSpecialisation id)]
399 setIdSpecialisation :: Id -> CoreRules -> Id
400 setIdSpecialisation id spec_info = modifyIdInfo (`setSpecInfo` spec_info) id
402 ---------------------------------
404 idCafInfo :: Id -> CafInfo
405 #ifdef OLD_STRICTNESS
406 idCafInfo id = case cgInfo (idInfo id) of
407 NoCgInfo -> pprPanic "idCafInfo" (ppr id)
408 info -> cgCafInfo info
410 idCafInfo id = cafInfo (idInfo id)
413 setIdCafInfo :: Id -> CafInfo -> Id
414 setIdCafInfo id caf_info = modifyIdInfo (`setCafInfo` caf_info) id
416 ---------------------------------
418 #ifdef OLD_STRICTNESS
419 idCprInfo :: Id -> CprInfo
420 idCprInfo id = cprInfo (idInfo id)
422 setIdCprInfo :: Id -> CprInfo -> Id
423 setIdCprInfo id cpr_info = modifyIdInfo (`setCprInfo` cpr_info) id
426 ---------------------------------
428 idOccInfo :: Id -> OccInfo
429 idOccInfo id = occInfo (idInfo id)
431 setIdOccInfo :: Id -> OccInfo -> Id
432 setIdOccInfo id occ_info = modifyIdInfo (`setOccInfo` occ_info) id
436 ---------------------------------
438 The inline pragma tells us to be very keen to inline this Id, but it's still
439 OK not to if optimisation is switched off.
442 idInlinePragma :: Id -> InlinePragInfo
443 idInlinePragma id = inlinePragInfo (idInfo id)
445 setInlinePragma :: Id -> InlinePragInfo -> Id
446 setInlinePragma id prag = modifyIdInfo (`setInlinePragInfo` prag) id
448 modifyInlinePragma :: Id -> (InlinePragInfo -> InlinePragInfo) -> Id
449 modifyInlinePragma id fn = modifyIdInfo (\info -> info `setInlinePragInfo` (fn (inlinePragInfo info))) id
453 ---------------------------------
456 idLBVarInfo :: Id -> LBVarInfo
457 idLBVarInfo id = lbvarInfo (idInfo id)
459 isOneShotLambda :: Id -> Bool
460 isOneShotLambda id = case idLBVarInfo id of
461 IsOneShotLambda -> True
464 setOneShotLambda :: Id -> Id
465 setOneShotLambda id = modifyIdInfo (`setLBVarInfo` IsOneShotLambda) id
467 clearOneShotLambda :: Id -> Id
468 clearOneShotLambda id
469 | isOneShotLambda id = modifyIdInfo (`setLBVarInfo` NoLBVarInfo) id
472 -- But watch out: this may change the type of something else
474 -- If we change the one-shot-ness of x, f's type changes
478 zapLamIdInfo :: Id -> Id
479 zapLamIdInfo id = maybeModifyIdInfo zapLamInfo id
481 zapDemandIdInfo id = maybeModifyIdInfo zapDemandInfo id