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, pprSymOcc, pprNonSymOcc, 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, setNameVisibility,
31 nameOccName, nameString,
32 isExportedName, nameSrcLoc,
41 emptyNameSet, unitNameSet, mkNameSet, unionNameSets, unionManyNameSets,
42 minusNameSet, elemNameSet, nameSetToList, addListToNameSet, isEmptyNameSet,
46 Provenance(..), pprProvenance,
49 -- Class NamedThing and overloaded friends
51 modAndOcc, isExported,
52 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 Unique ( pprUnique, showUnique, Unique )
69 import UniqSet ( UniqSet(..), emptyUniqSet, unitUniqSet, unionUniqSets, uniqSetToList, isEmptyUniqSet,
70 unionManyUniqSets, minusUniqSet, mkUniqSet, elementOfUniqSet, addListToUniqSet )
71 import UniqFM ( UniqFM )
72 import Util ( cmpPString, panic, assertPanic {-, pprTrace ToDo:rm-} )
76 %************************************************************************
78 \subsection[Name-pieces-datatypes]{The @Module@, @OccName@ datatypes}
80 %************************************************************************
83 type Module = FAST_STRING
85 data OccName = VarOcc FAST_STRING -- Variables and data constructors
86 | TvOcc FAST_STRING -- Type variables
87 | TCOcc FAST_STRING -- Type constructors and classes
89 moduleString :: Module -> String
90 moduleString mod = _UNPK_ mod
92 pprModule :: PprStyle -> Module -> Pretty
93 pprModule sty m = ppPStr m
95 pprOccName :: PprStyle -> OccName -> Pretty
96 pprOccName PprDebug n = ppCat [ppPStr (occNameString n), ppBracket (ppStr (occNameFlavour n))]
97 pprOccName sty n = if codeStyle sty
98 then identToC (occNameString n)
99 else ppPStr (occNameString n)
101 occNameString :: OccName -> FAST_STRING
102 occNameString (VarOcc s) = s
103 occNameString (TvOcc s) = s
104 occNameString (TCOcc s) = s
106 prefixOccName :: FAST_STRING -> OccName -> OccName
107 prefixOccName prefix (VarOcc s) = VarOcc (prefix _APPEND_ s)
108 prefixOccName prefix (TvOcc s) = TvOcc (prefix _APPEND_ s)
109 prefixOccName prefix (TCOcc s) = TCOcc (prefix _APPEND_ s)
111 -- occNameFlavour is used only to generate good error messages, so it doesn't matter
112 -- that the VarOcc case isn't mega-efficient. We could have different Occ constructors for
113 -- data constructors and values, but that makes everything else a bit more complicated.
114 occNameFlavour :: OccName -> String
115 occNameFlavour (VarOcc s) | isLexConId s = "data constructor"
116 | otherwise = "value"
117 occNameFlavour (TvOcc s) = "type variable"
118 occNameFlavour (TCOcc s) = "type constructor or class"
120 isVarOcc, isTCOcc, isTvOcc :: OccName -> Bool
121 isVarOcc (VarOcc s) = True
122 isVarOcc other = False
124 isTvOcc (TvOcc s) = True
125 isTvOcc other = False
127 isTCOcc (TCOcc s) = True
128 isTCOcc other = False
131 instance Eq OccName where
132 a == b = case (a `cmp` b) of { EQ_ -> True; _ -> False }
133 a /= b = case (a `cmp` b) of { EQ_ -> False; _ -> True }
135 instance Ord OccName where
136 a <= b = case (a `cmp` b) of { LT_ -> True; EQ_ -> True; GT__ -> False }
137 a < b = case (a `cmp` b) of { LT_ -> True; EQ_ -> False; GT__ -> False }
138 a >= b = case (a `cmp` b) of { LT_ -> False; EQ_ -> True; GT__ -> True }
139 a > b = case (a `cmp` b) of { LT_ -> False; EQ_ -> False; GT__ -> True }
141 instance Ord3 OccName where
144 (VarOcc s1) `cmpOcc` (VarOcc s2) = s1 `_CMP_STRING_` s2
145 (VarOcc s1) `cmpOcc` other2 = LT_
147 (TvOcc s1) `cmpOcc` (VarOcc s2) = GT_
148 (TvOcc s1) `cmpOcc` (TvOcc s2) = s1 `_CMP_STRING_` s2
149 (TvOcc s1) `cmpOcc` other = LT_
151 (TCOcc s1) `cmpOcc` (TCOcc s2) = s1 `_CMP_STRING_` s2
152 (TCOcc s1) `cmpOcc` other = GT_
154 instance Outputable OccName where
160 parenInCode, quoteInText :: OccName -> Bool
161 parenInCode occ = isLexSym (occNameString occ)
163 quoteInText occ = not (isLexSym (occNameString occ))
165 -- print `vars`, (op) correctly
166 pprSymOcc, pprNonSymOcc :: PprStyle -> OccName -> Pretty
170 then ppQuote (pprOccName sty var)
171 else pprOccName sty var
175 then ppParens (pprOccName sty var)
176 else pprOccName sty var
179 %************************************************************************
181 \subsection[Name-datatype]{The @Name@ datatype, and name construction}
183 %************************************************************************
192 Module -- The defining module
193 OccName -- Its name in that module
194 DefnInfo -- How it is defined
195 Provenance -- How it was brought into scope
198 Things with a @Global@ name are given C static labels, so they finally
199 appear in the .o file's symbol table. They appear in the symbol table
200 in the form M.n. If originally-local things have this property they
201 must be made @Global@ first.
204 data DefnInfo = VanillaDefn
205 | WiredInTyCon TyCon -- There's a wired-in version
206 | WiredInId Id -- ...ditto...
209 = LocalDef ExportFlag SrcLoc -- Locally defined
210 | Imported Module SrcLoc -- Directly imported from M; gives locn of import statement
211 | Implicit -- Implicitly imported
214 Something is "Exported" if it may be mentioned by another module without
215 warning. The crucial thing about Exported things is that they must
216 never be dropped as dead code, even if they aren't used in this module.
217 Furthermore, being Exported means that we can't see all call sites of the thing.
219 Exported things include:
220 - explicitly exported Ids, including data constructors, class method selectors
221 - dfuns from instance decls
223 Being Exported is *not* the same as finally appearing in the .o file's
224 symbol table. For example, a local Id may be mentioned in an Exported
225 Id's unfolding in the interface file, in which case the local Id goes
229 data ExportFlag = Exported | NotExported
233 mkLocalName :: Unique -> OccName -> SrcLoc -> Name
236 mkGlobalName :: Unique -> Module -> OccName -> DefnInfo -> Provenance -> Name
237 mkGlobalName = Global
239 mkSysLocalName :: Unique -> FAST_STRING -> SrcLoc -> Name
240 mkSysLocalName uniq str loc = Local uniq (VarOcc str) loc
242 mkWiredInIdName :: Unique -> Module -> FAST_STRING -> Id -> Name
243 mkWiredInIdName uniq mod occ id
244 = Global uniq mod (VarOcc occ) (WiredInId id) Implicit
246 mkWiredInTyConName :: Unique -> Module -> FAST_STRING -> TyCon -> Name
247 mkWiredInTyConName uniq mod occ tycon
248 = Global uniq mod (TCOcc occ) (WiredInTyCon tycon) Implicit
251 mkCompoundName :: (FAST_STRING -> FAST_STRING) -- Occurrence-name modifier
252 -> Unique -- New unique
253 -> Name -- Base name (must be a Global)
254 -> Name -- Result is always a value name
256 mkCompoundName str_fn uniq (Global _ mod occ defn prov)
257 = Global uniq mod new_occ defn prov
259 new_occ = VarOcc (str_fn (occNameString occ)) -- Always a VarOcc
261 mkCompoundName str_fn uniq (Local _ occ loc)
262 = Local uniq (VarOcc (str_fn (occNameString occ))) loc
264 -- Rather a wierd one that's used for names generated for instance decls
265 mkInstDeclName :: Unique -> Module -> OccName -> SrcLoc -> Bool -> Name
266 mkInstDeclName uniq mod occ loc from_here
267 = Global uniq mod occ VanillaDefn prov
269 prov | from_here = LocalDef Exported loc
270 | otherwise = Implicit
273 setNameProvenance :: Name -> Provenance -> Name -- Implicit Globals only
274 setNameProvenance (Global uniq mod occ def Implicit) prov = Global uniq mod occ def prov
275 setNameProvenance other_name prov = other_name
277 -- When we renumber/rename things, we need to be
278 -- able to change a Name's Unique to match the cached
279 -- one in the thing it's the name of. If you know what I mean.
280 changeUnique (Local _ n l) u = Local u n l
281 changeUnique (Global _ mod occ def prov) u = Global u mod occ def prov
283 setNameVisibility :: Module -> Name -> Name
284 -- setNameVisibility is applied to top-level names in the final program
285 -- The "visibility" here concerns whether the .o file's symbol table
286 -- mentions the thing; if so, it needs a module name in its symbol,
287 -- otherwise we just use its unique. The Global things are "visible"
288 -- and the local ones are not
290 setNameVisibility _ (Global uniq mod occ def (LocalDef NotExported loc))
291 | not all_toplev_ids_visible
294 setNameVisibility mod (Local uniq occ loc)
295 | all_toplev_ids_visible
297 (VarOcc (showUnique uniq)) -- It's local name must be unique!
298 VanillaDefn (LocalDef NotExported loc)
300 setNameVisibility mod name = name
302 all_toplev_ids_visible = not opt_OmitInterfacePragmas || -- Pragmas can make them visible
303 opt_EnsureSplittableC -- Splitting requires visiblilty
307 %************************************************************************
309 \subsection{Predicates and selectors}
311 %************************************************************************
314 nameUnique :: Name -> Unique
315 nameModAndOcc :: Name -> (Module, OccName) -- Globals only
316 nameOccName :: Name -> OccName
317 nameString :: Name -> FAST_STRING -- A.b form
318 nameSrcLoc :: Name -> SrcLoc
319 isLocallyDefinedName :: Name -> Bool
320 isExportedName :: Name -> Bool
321 isWiredInName :: Name -> Bool
322 isLocalName :: Name -> Bool
326 nameUnique (Local u _ _) = u
327 nameUnique (Global u _ _ _ _) = u
329 nameOccName (Local _ occ _) = occ
330 nameOccName (Global _ _ occ _ _) = occ
332 nameModAndOcc (Global _ mod occ _ _) = (mod,occ)
334 nameString (Local _ occ _) = occNameString occ
335 nameString (Global _ mod occ _ _) = mod _APPEND_ SLIT(".") _APPEND_ occNameString occ
337 isExportedName (Global _ _ _ _ (LocalDef Exported _)) = True
338 isExportedName other = False
340 nameSrcLoc (Local _ _ loc) = loc
341 nameSrcLoc (Global _ _ _ _ (LocalDef _ loc)) = loc
342 nameSrcLoc (Global _ _ _ _ (Imported _ loc)) = loc
343 nameSrcLoc other = noSrcLoc
345 isLocallyDefinedName (Local _ _ _) = True
346 isLocallyDefinedName (Global _ _ _ _ (LocalDef _ _)) = True
347 isLocallyDefinedName other = False
349 -- Things the compiler "knows about" are in some sense
350 -- "imported". When we are compiling the module where
351 -- the entities are defined, we need to be able to pick
352 -- them out, often in combination with isLocallyDefined.
353 isWiredInName (Global _ _ _ (WiredInTyCon _) _) = True
354 isWiredInName (Global _ _ _ (WiredInId _) _) = True
355 isWiredInName _ = False
357 maybeWiredInIdName :: Name -> Maybe Id
358 maybeWiredInIdName (Global _ _ _ (WiredInId id) _) = Just id
359 maybeWiredInIdName other = Nothing
361 maybeWiredInTyConName :: Name -> Maybe TyCon
362 maybeWiredInTyConName (Global _ _ _ (WiredInTyCon tc) _) = Just tc
363 maybeWiredInTyConName other = Nothing
366 isLocalName (Local _ _ _) = True
367 isLocalName _ = False
371 %************************************************************************
373 \subsection[Name-instances]{Instance declarations}
375 %************************************************************************
378 cmpName n1 n2 = c n1 n2
380 c (Local u1 _ _) (Local u2 _ _) = cmp u1 u2
381 c (Local _ _ _) _ = LT_
382 c (Global u1 _ _ _ _) (Global u2 _ _ _ _) = cmp u1 u2
383 c (Global _ _ _ _ _) _ = GT_
387 instance Eq Name where
388 a == b = case (a `cmp` b) of { EQ_ -> True; _ -> False }
389 a /= b = case (a `cmp` b) of { EQ_ -> False; _ -> True }
391 instance Ord Name where
392 a <= b = case (a `cmp` b) of { LT_ -> True; EQ_ -> True; GT__ -> False }
393 a < b = case (a `cmp` b) of { LT_ -> True; EQ_ -> False; GT__ -> False }
394 a >= b = case (a `cmp` b) of { LT_ -> False; EQ_ -> True; GT__ -> True }
395 a > b = case (a `cmp` b) of { LT_ -> False; EQ_ -> False; GT__ -> True }
397 instance Ord3 Name where
400 instance Uniquable Name where
401 uniqueOf = nameUnique
403 instance NamedThing Name where
409 %************************************************************************
411 \subsection{Pretty printing}
413 %************************************************************************
416 instance Outputable Name where
417 ppr sty (Local u n _) | codeStyle sty ||
418 ifaceStyle sty = pprUnique u
419 ppr PprForUser (Local _ n _) = ppPStr (occNameString n)
420 ppr other_sty (Local u n _) = ppBesides [ppPStr (occNameString n), ppPStr SLIT("_"), pprUnique u]
422 ppr sty name@(Global u m n _ _) = ppBesides [pp_name, pp_debug sty name]
424 pp_name | codeStyle sty = identToC qual_name
425 | otherwise = ppBesides[ ppPStr m, ppChar '.', ppPStr pk_n]
426 pk_n = occNameString n
427 qual_name = m _APPEND_ SLIT(".") _APPEND_ pk_n
429 pp_debug PprDebug (Global uniq m n _ prov) = ppBesides [ppStr "{-", pprUnique uniq, ppChar ',',
430 pp_prov prov, ppStr "-}"]
432 pp_prov (LocalDef Exported _) = ppChar 'x'
433 pp_prov (LocalDef NotExported _) = ppChar 'l'
434 pp_prov (Imported _ _) = ppChar 'i'
435 pp_prov Implicit = ppChar 'p'
436 pp_debug other name = ppNil
438 -- pprNameProvenance is used in error messages to say where a name came from
439 pprNameProvenance :: PprStyle -> Name -> Pretty
440 pprNameProvenance sty (Local _ _ loc) = pprProvenance sty (LocalDef NotExported loc)
441 pprNameProvenance sty (Global _ _ _ _ prov) = pprProvenance sty prov
443 pprProvenance :: PprStyle -> Provenance -> Pretty
444 pprProvenance sty (Imported mod loc)
445 = ppSep [ppPStr SLIT("Imported from"), pprModule sty mod, ppPStr SLIT("at"), ppr sty loc]
446 pprProvenance sty (LocalDef _ loc)
447 = ppSep [ppPStr SLIT("Defined at"), ppr sty loc]
448 pprProvenance sty Implicit
449 = panic "pprNameProvenance: Implicit"
453 %************************************************************************
455 \subsection[Sets of names}
457 %************************************************************************
460 type NameSet = UniqSet Name
461 emptyNameSet :: NameSet
462 unitNameSet :: Name -> NameSet
463 addListToNameSet :: NameSet -> [Name] -> NameSet
464 mkNameSet :: [Name] -> NameSet
465 unionNameSets :: NameSet -> NameSet -> NameSet
466 unionManyNameSets :: [NameSet] -> NameSet
467 minusNameSet :: NameSet -> NameSet -> NameSet
468 elemNameSet :: Name -> NameSet -> Bool
469 nameSetToList :: NameSet -> [Name]
470 isEmptyNameSet :: NameSet -> Bool
472 isEmptyNameSet = isEmptyUniqSet
473 emptyNameSet = emptyUniqSet
474 unitNameSet = unitUniqSet
475 mkNameSet = mkUniqSet
476 addListToNameSet = addListToUniqSet
477 unionNameSets = unionUniqSets
478 unionManyNameSets = unionManyUniqSets
479 minusNameSet = minusUniqSet
480 elemNameSet = elementOfUniqSet
481 nameSetToList = uniqSetToList
486 %************************************************************************
488 \subsection{Overloaded functions related to Names}
490 %************************************************************************
493 class NamedThing a where
494 getOccName :: a -> OccName -- Even RdrNames can do this!
497 getOccName n = nameOccName (getName n) -- Default method
501 modAndOcc :: NamedThing a => a -> (Module, OccName)
502 getSrcLoc :: NamedThing a => a -> SrcLoc
503 isLocallyDefined :: NamedThing a => a -> Bool
504 isExported :: NamedThing a => a -> Bool
505 getOccString :: NamedThing a => a -> String
507 modAndOcc = nameModAndOcc . getName
508 isExported = isExportedName . getName
509 getSrcLoc = nameSrcLoc . getName
510 isLocallyDefined = isLocallyDefinedName . getName
511 pprSym sty = pprSymOcc sty . getOccName
512 pprNonSym sty = pprNonSymOcc sty . getOccName
513 getOccString x = _UNPK_ (occNameString (getOccName x))
517 {-# SPECIALIZE isLocallyDefined