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,
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,
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
239 other -> panic "recordSelectorFieldLabel"
241 isRecordSelector id = case globalIdDetails id of
242 RecordSelId lbl -> True
245 isPrimOpId id = case globalIdDetails id of
249 isPrimOpId_maybe id = case globalIdDetails id of
250 PrimOpId op -> Just op
253 isFCallId id = case globalIdDetails id of
257 isFCallId_maybe id = case globalIdDetails id of
258 FCallId call -> Just call
261 isDataConWorkId id = case globalIdDetails id of
262 DataConWorkId _ -> True
265 isDataConWorkId_maybe id = case globalIdDetails id of
266 DataConWorkId con -> Just con
269 -- hasNoBinding returns True of an Id which may not have a
270 -- binding, even though it is defined in this module.
271 -- Data constructor workers used to be things of this kind, but
272 -- they aren't any more. Instead, we inject a binding for
273 -- them at the CorePrep stage.
274 -- EXCEPT: unboxed tuples, which definitely have no binding
275 hasNoBinding id = case globalIdDetails id of
278 DataConWorkId dc -> isUnboxedTupleCon dc
281 isImplicitId :: Id -> Bool
282 -- isImplicitId tells whether an Id's info is implied by other
283 -- declarations, so we don't need to put its signature in an interface
284 -- file, even if it's mentioned in some other interface unfolding.
286 = case globalIdDetails id of
287 RecordSelId _ -> True
291 DataConWorkId _ -> True
292 DataConWrapId _ -> True
293 -- These are are implied by their type or class decl;
294 -- remember that all type and class decls appear in the interface file.
295 -- The dfun id is not an implicit Id; it must *not* be omitted, because
296 -- it carries version info for the instance decl
301 isDeadBinder :: Id -> Bool
302 isDeadBinder bndr | isId bndr = isDeadOcc (idOccInfo bndr)
303 | otherwise = False -- TyVars count as not dead
307 %************************************************************************
309 \subsection{IdInfo stuff}
311 %************************************************************************
314 ---------------------------------
316 idArity :: Id -> Arity
317 idArity id = arityInfo (idInfo id)
319 setIdArity :: Id -> Arity -> Id
320 setIdArity id arity = modifyIdInfo (`setArityInfo` arity) id
322 #ifdef OLD_STRICTNESS
323 ---------------------------------
325 idStrictness :: Id -> StrictnessInfo
326 idStrictness id = strictnessInfo (idInfo id)
328 setIdStrictness :: Id -> StrictnessInfo -> Id
329 setIdStrictness id strict_info = modifyIdInfo (`setStrictnessInfo` strict_info) id
332 -- isBottomingId returns true if an application to n args would diverge
333 isBottomingId :: Id -> Bool
334 isBottomingId id = isBottomingSig (idNewStrictness id)
336 idNewStrictness_maybe :: Id -> Maybe StrictSig
337 idNewStrictness :: Id -> StrictSig
339 idNewStrictness_maybe id = newStrictnessInfo (idInfo id)
340 idNewStrictness id = idNewStrictness_maybe id `orElse` topSig
342 setIdNewStrictness :: Id -> StrictSig -> Id
343 setIdNewStrictness id sig = modifyIdInfo (`setNewStrictnessInfo` Just sig) id
345 zapIdNewStrictness :: Id -> Id
346 zapIdNewStrictness id = modifyIdInfo (`setNewStrictnessInfo` Nothing) id
348 ---------------------------------
350 idWorkerInfo :: Id -> WorkerInfo
351 idWorkerInfo id = workerInfo (idInfo id)
353 setIdWorkerInfo :: Id -> WorkerInfo -> Id
354 setIdWorkerInfo id work_info = modifyIdInfo (`setWorkerInfo` work_info) id
356 ---------------------------------
358 idUnfolding :: Id -> Unfolding
359 idUnfolding id = unfoldingInfo (idInfo id)
361 setIdUnfolding :: Id -> Unfolding -> Id
362 setIdUnfolding id unfolding = modifyIdInfo (`setUnfoldingInfo` unfolding) id
364 #ifdef OLD_STRICTNESS
365 ---------------------------------
367 idDemandInfo :: Id -> Demand.Demand
368 idDemandInfo id = demandInfo (idInfo id)
370 setIdDemandInfo :: Id -> Demand.Demand -> Id
371 setIdDemandInfo id demand_info = modifyIdInfo (`setDemandInfo` demand_info) id
374 idNewDemandInfo_maybe :: Id -> Maybe NewDemand.Demand
375 idNewDemandInfo :: Id -> NewDemand.Demand
377 idNewDemandInfo_maybe id = newDemandInfo (idInfo id)
378 idNewDemandInfo id = newDemandInfo (idInfo id) `orElse` NewDemand.topDmd
380 setIdNewDemandInfo :: Id -> NewDemand.Demand -> Id
381 setIdNewDemandInfo id dmd = modifyIdInfo (`setNewDemandInfo` Just dmd) id
383 ---------------------------------
385 idSpecialisation :: Id -> CoreRules
386 idSpecialisation id = specInfo (idInfo id)
388 idCoreRules :: Id -> [IdCoreRule]
389 idCoreRules id = [(id,rule) | rule <- rulesRules (idSpecialisation id)]
391 setIdSpecialisation :: Id -> CoreRules -> Id
392 setIdSpecialisation id spec_info = modifyIdInfo (`setSpecInfo` spec_info) id
394 ---------------------------------
396 idCafInfo :: Id -> CafInfo
397 #ifdef OLD_STRICTNESS
398 idCafInfo id = case cgInfo (idInfo id) of
399 NoCgInfo -> pprPanic "idCafInfo" (ppr id)
400 info -> cgCafInfo info
402 idCafInfo id = cafInfo (idInfo id)
405 setIdCafInfo :: Id -> CafInfo -> Id
406 setIdCafInfo id caf_info = modifyIdInfo (`setCafInfo` caf_info) id
408 ---------------------------------
410 #ifdef OLD_STRICTNESS
411 idCprInfo :: Id -> CprInfo
412 idCprInfo id = cprInfo (idInfo id)
414 setIdCprInfo :: Id -> CprInfo -> Id
415 setIdCprInfo id cpr_info = modifyIdInfo (`setCprInfo` cpr_info) id
418 ---------------------------------
420 idOccInfo :: Id -> OccInfo
421 idOccInfo id = occInfo (idInfo id)
423 setIdOccInfo :: Id -> OccInfo -> Id
424 setIdOccInfo id occ_info = modifyIdInfo (`setOccInfo` occ_info) id
428 ---------------------------------
430 The inline pragma tells us to be very keen to inline this Id, but it's still
431 OK not to if optimisation is switched off.
434 idInlinePragma :: Id -> InlinePragInfo
435 idInlinePragma id = inlinePragInfo (idInfo id)
437 setInlinePragma :: Id -> InlinePragInfo -> Id
438 setInlinePragma id prag = modifyIdInfo (`setInlinePragInfo` prag) id
440 modifyInlinePragma :: Id -> (InlinePragInfo -> InlinePragInfo) -> Id
441 modifyInlinePragma id fn = modifyIdInfo (\info -> info `setInlinePragInfo` (fn (inlinePragInfo info))) id
445 ---------------------------------
448 idLBVarInfo :: Id -> LBVarInfo
449 idLBVarInfo id = lbvarInfo (idInfo id)
451 isOneShotLambda :: Id -> Bool
452 isOneShotLambda id = case idLBVarInfo id of
453 IsOneShotLambda -> True
456 setOneShotLambda :: Id -> Id
457 setOneShotLambda id = modifyIdInfo (`setLBVarInfo` IsOneShotLambda) id
459 clearOneShotLambda :: Id -> Id
460 clearOneShotLambda id
461 | isOneShotLambda id = modifyIdInfo (`setLBVarInfo` NoLBVarInfo) id
464 -- But watch out: this may change the type of something else
466 -- If we change the one-shot-ness of x, f's type changes
470 zapLamIdInfo :: Id -> Id
471 zapLamIdInfo id = maybeModifyIdInfo zapLamInfo id
473 zapDemandIdInfo id = maybeModifyIdInfo zapDemandInfo id