2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
4 \section[Name]{@Name@: to transmit name info from renamer to typechecker}
7 #include "HsVersions.h"
12 pprModule, moduleString,
16 pprOccName, occNameString, occNameFlavour,
17 isTvOcc, isTCOcc, isVarOcc, prefixOccName,
18 quoteInText, parenInCode,
22 mkLocalName, mkSysLocalName,
24 mkCompoundName, mkGlobalName, mkInstDeclName,
26 mkWiredInIdName, mkWiredInTyConName,
27 maybeWiredInIdName, maybeWiredInTyConName,
30 nameUnique, changeUnique, setNameProvenance, getNameProvenance,
32 nameOccName, nameString, nameModule,
34 isExportedName, nameSrcLoc,
43 emptyNameSet, unitNameSet, mkNameSet, unionNameSets, unionManyNameSets,
44 minusNameSet, elemNameSet, nameSetToList, addListToNameSet, isEmptyNameSet,
48 Provenance(..), pprProvenance,
51 -- Class NamedThing and overloaded friends
53 modAndOcc, isExported,
54 getSrcLoc, isLocallyDefined, getOccString
58 import TyLoop --( GenId, Id(..), TyCon ) -- Used inside Names
59 import CStrings ( identToC, modnameToC, cSEP )
60 import CmdLineOpts ( opt_OmitInterfacePragmas, opt_EnsureSplittableC )
62 import Outputable ( Outputable(..) )
63 import PprStyle ( PprStyle(..), codeStyle, ifaceStyle )
64 import PrelMods ( gHC__ )
66 import Lex ( isLexSym, isLexConId )
67 import SrcLoc ( noSrcLoc, SrcLoc )
68 import Usage ( SYN_IE(UVar), SYN_IE(Usage) )
69 import Unique ( pprUnique, showUnique, Unique )
70 import UniqSet ( UniqSet(..), emptyUniqSet, unitUniqSet, unionUniqSets, uniqSetToList, isEmptyUniqSet,
71 unionManyUniqSets, minusUniqSet, mkUniqSet, elementOfUniqSet, addListToUniqSet )
72 import UniqFM ( UniqFM, SYN_IE(Uniquable) )
73 import Util --( cmpPString, panic, assertPanic {-, pprTrace ToDo:rm-} )
78 %************************************************************************
80 \subsection[Name-pieces-datatypes]{The @Module@, @OccName@ datatypes}
82 %************************************************************************
85 type Module = FAST_STRING
87 data OccName = VarOcc FAST_STRING -- Variables and data constructors
88 | TvOcc FAST_STRING -- Type variables
89 | TCOcc FAST_STRING -- Type constructors and classes
91 moduleString :: Module -> String
92 moduleString mod = _UNPK_ mod
94 pprModule :: PprStyle -> Module -> Doc
95 pprModule sty m = ptext m
97 pprOccName :: PprStyle -> OccName -> Doc
98 pprOccName sty n = if codeStyle sty
99 then identToC (occNameString n)
100 else ptext (occNameString n)
102 occNameString :: OccName -> FAST_STRING
103 occNameString (VarOcc s) = s
104 occNameString (TvOcc s) = s
105 occNameString (TCOcc s) = s
107 prefixOccName :: FAST_STRING -> OccName -> OccName
108 prefixOccName prefix (VarOcc s) = VarOcc (prefix _APPEND_ s)
109 prefixOccName prefix (TvOcc s) = TvOcc (prefix _APPEND_ s)
110 prefixOccName prefix (TCOcc s) = TCOcc (prefix _APPEND_ s)
112 -- occNameFlavour is used only to generate good error messages, so it doesn't matter
113 -- that the VarOcc case isn't mega-efficient. We could have different Occ constructors for
114 -- data constructors and values, but that makes everything else a bit more complicated.
115 occNameFlavour :: OccName -> String
116 occNameFlavour (VarOcc s) | isLexConId s = "data constructor"
117 | otherwise = "value"
118 occNameFlavour (TvOcc s) = "type variable"
119 occNameFlavour (TCOcc s) = "type constructor or class"
121 isVarOcc, isTCOcc, isTvOcc :: OccName -> Bool
122 isVarOcc (VarOcc s) = True
123 isVarOcc other = False
125 isTvOcc (TvOcc s) = True
126 isTvOcc other = False
128 isTCOcc (TCOcc s) = True
129 isTCOcc other = False
132 instance Eq OccName where
133 a == b = case (a `cmp` b) of { EQ_ -> True; _ -> False }
134 a /= b = case (a `cmp` b) of { EQ_ -> False; _ -> True }
136 instance Ord OccName where
137 a <= b = case (a `cmp` b) of { LT_ -> True; EQ_ -> True; GT__ -> False }
138 a < b = case (a `cmp` b) of { LT_ -> True; EQ_ -> False; GT__ -> False }
139 a >= b = case (a `cmp` b) of { LT_ -> False; EQ_ -> True; GT__ -> True }
140 a > b = case (a `cmp` b) of { LT_ -> False; EQ_ -> False; GT__ -> True }
142 instance Ord3 OccName where
145 (VarOcc s1) `cmpOcc` (VarOcc s2) = s1 `_CMP_STRING_` s2
146 (VarOcc s1) `cmpOcc` other2 = LT_
148 (TvOcc s1) `cmpOcc` (VarOcc s2) = GT_
149 (TvOcc s1) `cmpOcc` (TvOcc s2) = s1 `_CMP_STRING_` s2
150 (TvOcc s1) `cmpOcc` other = LT_
152 (TCOcc s1) `cmpOcc` (TCOcc s2) = s1 `_CMP_STRING_` s2
153 (TCOcc s1) `cmpOcc` other = GT_
155 instance Outputable OccName where
161 parenInCode, quoteInText :: OccName -> Bool
162 parenInCode occ = isLexSym (occNameString occ)
164 quoteInText occ = not (isLexSym (occNameString occ))
167 %************************************************************************
169 \subsection[Name-datatype]{The @Name@ datatype, and name construction}
171 %************************************************************************
180 Module -- The defining module
181 OccName -- Its name in that module
182 DefnInfo -- How it is defined
183 Provenance -- How it was brought into scope
186 Things with a @Global@ name are given C static labels, so they finally
187 appear in the .o file's symbol table. They appear in the symbol table
188 in the form M.n. If originally-local things have this property they
189 must be made @Global@ first.
192 data DefnInfo = VanillaDefn
193 | WiredInTyCon TyCon -- There's a wired-in version
194 | WiredInId Id -- ...ditto...
197 = LocalDef ExportFlag SrcLoc -- Locally defined
198 | Imported Module SrcLoc -- Directly imported from M; gives locn of import statement
199 | Implicit -- Implicitly imported
202 Something is "Exported" if it may be mentioned by another module without
203 warning. The crucial thing about Exported things is that they must
204 never be dropped as dead code, even if they aren't used in this module.
205 Furthermore, being Exported means that we can't see all call sites of the thing.
207 Exported things include:
208 - explicitly exported Ids, including data constructors, class method selectors
209 - dfuns from instance decls
211 Being Exported is *not* the same as finally appearing in the .o file's
212 symbol table. For example, a local Id may be mentioned in an Exported
213 Id's unfolding in the interface file, in which case the local Id goes
217 data ExportFlag = Exported | NotExported
221 mkLocalName :: Unique -> OccName -> SrcLoc -> Name
224 mkGlobalName :: Unique -> Module -> OccName -> DefnInfo -> Provenance -> Name
225 mkGlobalName = Global
227 mkSysLocalName :: Unique -> FAST_STRING -> SrcLoc -> Name
228 mkSysLocalName uniq str loc = Local uniq (VarOcc str) loc
230 mkWiredInIdName :: Unique -> Module -> FAST_STRING -> Id -> Name
231 mkWiredInIdName uniq mod occ id
232 = Global uniq mod (VarOcc occ) (WiredInId id) Implicit
234 mkWiredInTyConName :: Unique -> Module -> FAST_STRING -> TyCon -> Name
235 mkWiredInTyConName uniq mod occ tycon
236 = Global uniq mod (TCOcc occ) (WiredInTyCon tycon) Implicit
239 mkCompoundName :: (FAST_STRING -> FAST_STRING) -- Occurrence-name modifier
240 -> Unique -- New unique
241 -> Name -- Base name (must be a Global)
242 -> Name -- Result is always a value name
244 mkCompoundName str_fn uniq (Global _ mod occ defn prov)
245 = Global uniq mod new_occ defn prov
247 new_occ = VarOcc (str_fn (occNameString occ)) -- Always a VarOcc
249 mkCompoundName str_fn uniq (Local _ occ loc)
250 = Local uniq (VarOcc (str_fn (occNameString occ))) loc
252 -- Rather a wierd one that's used for names generated for instance decls
253 mkInstDeclName :: Unique -> Module -> OccName -> SrcLoc -> Bool -> Name
254 mkInstDeclName uniq mod occ loc from_here
255 = Global uniq mod occ VanillaDefn prov
257 prov | from_here = LocalDef Exported loc
258 | otherwise = Implicit
261 setNameProvenance :: Name -> Provenance -> Name -- Implicit Globals only
262 setNameProvenance (Global uniq mod occ def Implicit) prov = Global uniq mod occ def prov
263 setNameProvenance other_name prov = other_name
265 getNameProvenance :: Name -> Provenance
266 getNameProvenance (Global uniq mod occ def prov) = prov
267 getNameProvenance (Local uniq occ locn) = LocalDef NotExported locn
269 -- When we renumber/rename things, we need to be
270 -- able to change a Name's Unique to match the cached
271 -- one in the thing it's the name of. If you know what I mean.
272 changeUnique (Local _ n l) u = Local u n l
273 changeUnique (Global _ mod occ def prov) u = Global u mod occ def prov
275 setNameVisibility :: Module -> Name -> Name
276 -- setNameVisibility is applied to top-level names in the final program
277 -- The "visibility" here concerns whether the .o file's symbol table
278 -- mentions the thing; if so, it needs a module name in its symbol,
279 -- otherwise we just use its unique. The Global things are "visible"
280 -- and the local ones are not
282 setNameVisibility _ (Global uniq mod occ def (LocalDef NotExported loc))
283 | not all_toplev_ids_visible
286 setNameVisibility mod (Local uniq occ loc)
287 | all_toplev_ids_visible
289 (VarOcc (showUnique uniq)) -- It's local name must be unique!
290 VanillaDefn (LocalDef NotExported loc)
292 setNameVisibility mod name = name
294 all_toplev_ids_visible = not opt_OmitInterfacePragmas || -- Pragmas can make them visible
295 opt_EnsureSplittableC -- Splitting requires visiblilty
299 %************************************************************************
301 \subsection{Predicates and selectors}
303 %************************************************************************
306 nameUnique :: Name -> Unique
307 nameModAndOcc :: Name -> (Module, OccName) -- Globals only
308 nameOccName :: Name -> OccName
309 nameModule :: Name -> Module
310 nameString :: Name -> FAST_STRING -- A.b form
311 nameSrcLoc :: Name -> SrcLoc
312 isLocallyDefinedName :: Name -> Bool
313 isExportedName :: Name -> Bool
314 isWiredInName :: Name -> Bool
315 isLocalName :: Name -> Bool
319 nameUnique (Local u _ _) = u
320 nameUnique (Global u _ _ _ _) = u
322 nameOccName (Local _ occ _) = occ
323 nameOccName (Global _ _ occ _ _) = occ
325 nameModule (Global _ mod occ _ _) = mod
327 nameModAndOcc (Global _ mod occ _ _) = (mod,occ)
329 nameString (Local _ occ _) = occNameString occ
330 nameString (Global _ mod occ _ _) = mod _APPEND_ SLIT(".") _APPEND_ occNameString occ
332 isExportedName (Global _ _ _ _ (LocalDef Exported _)) = True
333 isExportedName other = False
335 nameSrcLoc (Local _ _ loc) = loc
336 nameSrcLoc (Global _ _ _ _ (LocalDef _ loc)) = loc
337 nameSrcLoc (Global _ _ _ _ (Imported _ loc)) = loc
338 nameSrcLoc other = noSrcLoc
340 isLocallyDefinedName (Local _ _ _) = True
341 isLocallyDefinedName (Global _ _ _ _ (LocalDef _ _)) = True
342 isLocallyDefinedName other = False
344 -- Things the compiler "knows about" are in some sense
345 -- "imported". When we are compiling the module where
346 -- the entities are defined, we need to be able to pick
347 -- them out, often in combination with isLocallyDefined.
348 isWiredInName (Global _ _ _ (WiredInTyCon _) _) = True
349 isWiredInName (Global _ _ _ (WiredInId _) _) = True
350 isWiredInName _ = False
352 maybeWiredInIdName :: Name -> Maybe Id
353 maybeWiredInIdName (Global _ _ _ (WiredInId id) _) = Just id
354 maybeWiredInIdName other = Nothing
356 maybeWiredInTyConName :: Name -> Maybe TyCon
357 maybeWiredInTyConName (Global _ _ _ (WiredInTyCon tc) _) = Just tc
358 maybeWiredInTyConName other = Nothing
361 isLocalName (Local _ _ _) = True
362 isLocalName _ = False
366 %************************************************************************
368 \subsection[Name-instances]{Instance declarations}
370 %************************************************************************
373 cmpName n1 n2 = c n1 n2
375 c (Local u1 _ _) (Local u2 _ _) = cmp u1 u2
376 c (Local _ _ _) _ = LT_
377 c (Global u1 _ _ _ _) (Global u2 _ _ _ _) = cmp u1 u2
378 c (Global _ _ _ _ _) _ = GT_
382 instance Eq Name where
383 a == b = case (a `cmp` b) of { EQ_ -> True; _ -> False }
384 a /= b = case (a `cmp` b) of { EQ_ -> False; _ -> True }
386 instance Ord Name where
387 a <= b = case (a `cmp` b) of { LT_ -> True; EQ_ -> True; GT__ -> False }
388 a < b = case (a `cmp` b) of { LT_ -> True; EQ_ -> False; GT__ -> False }
389 a >= b = case (a `cmp` b) of { LT_ -> False; EQ_ -> True; GT__ -> True }
390 a > b = case (a `cmp` b) of { LT_ -> False; EQ_ -> False; GT__ -> True }
392 instance Ord3 Name where
395 instance Uniquable Name where
396 uniqueOf = nameUnique
398 instance NamedThing Name where
404 %************************************************************************
406 \subsection{Pretty printing}
408 %************************************************************************
411 instance Outputable Name where
412 ppr PprQuote name@(Local _ _ _) = quotes (ppr PprForUser name)
413 ppr PprForUser (Local _ n _) = ptext (occNameString n)
415 ppr sty (Local u n _) | codeStyle sty ||
416 ifaceStyle sty = pprUnique u
418 ppr sty (Local u n _) = hcat [ptext (occNameString n), ptext SLIT("_"), pprUnique u]
420 ppr PprQuote name@(Global _ _ _ _ _) = quotes (ppr PprForUser name)
422 ppr sty name@(Global u m n _ _)
424 = identToC (m _APPEND_ SLIT(".") _APPEND_ occNameString n)
426 ppr sty name@(Global u m n _ prov)
427 = hcat [pp_mod, ptext (occNameString n), pp_debug sty name]
429 pp_mod = case prov of --- Omit home module qualifier
430 LocalDef _ _ -> empty
431 other -> pprModule PprForUser m <> char '.'
434 pp_debug PprDebug (Global uniq m n _ prov) = hcat [text "{-", pprUnique uniq, char ',',
435 pp_prov prov, text "-}"]
437 pp_prov (LocalDef Exported _) = char 'x'
438 pp_prov (LocalDef NotExported _) = char 'l'
439 pp_prov (Imported _ _) = char 'i'
440 pp_prov Implicit = char 'p'
441 pp_debug other name = empty
443 -- pprNameProvenance is used in error messages to say where a name came from
444 pprNameProvenance :: PprStyle -> Name -> Doc
445 pprNameProvenance sty (Local _ _ loc) = pprProvenance sty (LocalDef NotExported loc)
446 pprNameProvenance sty (Global _ _ _ _ prov) = pprProvenance sty prov
448 pprProvenance :: PprStyle -> Provenance -> Doc
449 pprProvenance sty (Imported mod loc)
450 = sep [ptext SLIT("Imported from"), pprModule sty mod, ptext SLIT("at"), ppr sty loc]
451 pprProvenance sty (LocalDef _ loc)
452 = sep [ptext SLIT("Defined at"), ppr sty loc]
453 pprProvenance sty Implicit
454 = panic "pprNameProvenance: Implicit"
458 %************************************************************************
460 \subsection[Sets of names}
462 %************************************************************************
465 type NameSet = UniqSet Name
466 emptyNameSet :: NameSet
467 unitNameSet :: Name -> NameSet
468 addListToNameSet :: NameSet -> [Name] -> NameSet
469 mkNameSet :: [Name] -> NameSet
470 unionNameSets :: NameSet -> NameSet -> NameSet
471 unionManyNameSets :: [NameSet] -> NameSet
472 minusNameSet :: NameSet -> NameSet -> NameSet
473 elemNameSet :: Name -> NameSet -> Bool
474 nameSetToList :: NameSet -> [Name]
475 isEmptyNameSet :: NameSet -> Bool
477 isEmptyNameSet = isEmptyUniqSet
478 emptyNameSet = emptyUniqSet
479 unitNameSet = unitUniqSet
480 mkNameSet = mkUniqSet
481 addListToNameSet = addListToUniqSet
482 unionNameSets = unionUniqSets
483 unionManyNameSets = unionManyUniqSets
484 minusNameSet = minusUniqSet
485 elemNameSet = elementOfUniqSet
486 nameSetToList = uniqSetToList
491 %************************************************************************
493 \subsection{Overloaded functions related to Names}
495 %************************************************************************
498 class NamedThing a where
499 getOccName :: a -> OccName -- Even RdrNames can do this!
502 getOccName n = nameOccName (getName n) -- Default method
506 modAndOcc :: NamedThing a => a -> (Module, OccName)
507 getModule :: NamedThing a => a -> Module
508 getSrcLoc :: NamedThing a => a -> SrcLoc
509 isLocallyDefined :: NamedThing a => a -> Bool
510 isExported :: NamedThing a => a -> Bool
511 getOccString :: NamedThing a => a -> String
513 modAndOcc = nameModAndOcc . getName
514 getModule = nameModule . getName
515 isExported = isExportedName . getName
516 getSrcLoc = nameSrcLoc . getName
517 isLocallyDefined = isLocallyDefinedName . getName
518 getOccString x = _UNPK_ (occNameString (getOccName x))
522 {-# SPECIALIZE isLocallyDefined