%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[Name]{@Name@: to transmit name info from renamer to typechecker}
\begin{code}
-#include "HsVersions.h"
-
module Name (
- Module(..),
-
- RdrName(..),
- isUnqual,
- isQual,
- isRdrLexCon,
- appendRdr,
- showRdr,
- cmpRdr,
-
- Name,
- Provenance,
- mkLocalName, isLocalName,
- mkTopLevName, mkImportedName,
- mkImplicitName, isImplicitName,
- mkBuiltinName, mkCompoundName,
-
- mkFunTyConName, mkTupleDataConName, mkTupleTyConName,
- mkTupNameStr,
-
- NamedThing(..), -- class
- ExportFlag(..),
- isExported{-overloaded-}, exportFlagOn{-not-},
-
- nameUnique,
- nameOccName,
- nameOrigName,
- nameExportFlag,
- nameSrcLoc,
- nameImpLocs,
- nameImportFlag,
+ -- Re-export the Module type
+ Module,
+ pprModule, moduleString,
+
+ -- The basic form of names
+ isLexCon, isLexVar, isLexId, isLexSym,
+ isLexConId, isLexConSym, isLexVarId, isLexVarSym,
+ mkTupNameStr, mkUbxTupNameStr, isLowerISO, isUpperISO,
+
+ -- The OccName type
+ OccName(..), varOcc,
+ pprOccName, occNameString, occNameFlavour,
+ isTvOcc, isTCOcc, isVarOcc, prefixOccName,
+
+ -- The Name type
+ Name, -- Abstract
+ mkLocalName, mkSysLocalName,
+
+ mkCompoundName, mkGlobalName,
+
+ mkWiredInIdName, mkWiredInTyConName,
+ maybeWiredInIdName, maybeWiredInTyConName,
+ isWiredInName,
+
+ nameUnique, changeUnique, setNameProvenance, getNameProvenance,
+ setNameVisibility, mkNameVisible,
+ nameOccName, nameModule,
+
+ isExportedName, nameSrcLoc,
isLocallyDefinedName,
- isPreludeDefinedName,
- origName, moduleOf, nameOf, moduleNamePair,
- getOccName, getExportFlag,
- getSrcLoc, getImpLocs,
- isLocallyDefined, isPreludeDefined,
- getLocalName, ltLexical,
+ isSysLocalName, isLocalName, isGlobalName, isExternallyVisibleName,
+
+ pprNameProvenance,
- isSymLexeme, pprSym, pprNonSym,
- isLexCon, isLexVar, isLexId, isLexSym, isLexSpecialSym,
- isLexConId, isLexConSym, isLexVarId, isLexVarSym
+ -- Special Names
+ dictNamePrefix, mkSuperDictSelName, mkWorkerName,
+ mkDefaultMethodName, mkClassTyConStr, mkClassDataConStr,
+
+ -- Misc
+ Provenance(..), pprProvenance,
+ ExportFlag(..),
+ PrintUnqualified,
+
+ -- Class NamedThing and overloaded friends
+ NamedThing(..),
+ modAndOcc, isExported,
+ getSrcLoc, isLocallyDefined, getOccString
) where
-import Ubiq
-
-import CStrings ( identToC, cSEP )
-import Outputable ( Outputable(..) )
-import PprStyle ( PprStyle(..), codeStyle )
-import PrelMods ( pRELUDE, pRELUDE_BUILTIN, fromPrelude )
-import Pretty
-import SrcLoc ( mkBuiltinSrcLoc, mkUnknownSrcLoc )
-import Unique ( funTyConKey, mkTupleDataConUnique, mkTupleTyConUnique,
- pprUnique, Unique
- )
-import Util ( thenCmp, _CMP_STRING_, nOfThem, panic, assertPanic )
+#include "HsVersions.h"
+
+import {-# SOURCE #-} Var ( Id )
+import {-# SOURCE #-} TyCon ( TyCon )
+
+import CStrings ( identToC )
+import PrelMods ( pREL_BASE, pREL_TUP, pREL_GHC )
+import CmdLineOpts ( opt_PprStyle_NoPrags, opt_OmitInterfacePragmas, opt_EnsureSplittableC )
+import BasicTypes ( Module, IfaceFlavour(..), moduleString, pprModule )
+
+import SrcLoc ( noSrcLoc, mkBuiltinSrcLoc, SrcLoc )
+import Unique ( pprUnique, Unique, Uniquable(..) )
+import Outputable
+import Char ( isUpper, isLower, ord )
+import Util ( nOfThem )
+import GlaExts
\end{code}
+
%************************************************************************
%* *
-\subsection[RdrName]{The @RdrName@ datatype; names read from files}
+\subsection{Lexical categories}
%* *
%************************************************************************
-\begin{code}
-type Module = FAST_STRING
-
-data RdrName
- = Unqual FAST_STRING
- | Qual Module FAST_STRING
+These functions test strings to see if they fit the lexical categories
+defined in the Haskell report.
-isUnqual (Unqual _) = True
-isUnqual (Qual _ _) = False
+\begin{code}
+isLexCon, isLexVar, isLexId, isLexSym, isLexConId, isLexConSym,
+ isLexVarId, isLexVarSym :: FAST_STRING -> Bool
-isQual (Unqual _) = False
-isQual (Qual _ _) = True
+isLexCon cs = isLexConId cs || isLexConSym cs
+isLexVar cs = isLexVarId cs || isLexVarSym cs
-isRdrLexCon (Unqual n) = isLexCon n
-isRdrLexCon (Qual m n) = isLexCon n
+isLexId cs = isLexConId cs || isLexVarId cs
+isLexSym cs = isLexConSym cs || isLexVarSym cs
-appendRdr (Unqual n) str = Unqual (n _APPEND_ str)
-appendRdr (Qual m n) str = ASSERT(not (fromPrelude m))
- Qual m (n _APPEND_ str)
+-------------
-cmpRdr (Unqual n1) (Unqual n2) = _CMP_STRING_ n1 n2
-cmpRdr (Unqual n1) (Qual m2 n2) = LT_
-cmpRdr (Qual m1 n1) (Unqual n2) = GT_
-cmpRdr (Qual m1 n1) (Qual m2 n2) = thenCmp (_CMP_STRING_ m1 m2) (_CMP_STRING_ n1 n2)
+isLexConId cs
+ | _NULL_ cs = False
+ | cs == SLIT("[]") = True
+ | c == '(' = True -- (), (,), (,,), ...
+ | otherwise = isUpper c || isUpperISO c
+ where
+ c = _HEAD_ cs
-instance Eq RdrName where
- a == b = case (a `cmp` b) of { EQ_ -> True; _ -> False }
- a /= b = case (a `cmp` b) of { EQ_ -> False; _ -> True }
+isLexVarId cs
+ | _NULL_ cs = False
+ | otherwise = isLower c || isLowerISO c
+ where
+ c = _HEAD_ cs
-instance Ord RdrName where
- a <= b = case (a `cmp` b) of { LT_ -> True; EQ_ -> True; GT__ -> False }
- a < b = case (a `cmp` b) of { LT_ -> True; EQ_ -> False; GT__ -> False }
- a >= b = case (a `cmp` b) of { LT_ -> False; EQ_ -> True; GT__ -> True }
- a > b = case (a `cmp` b) of { LT_ -> False; EQ_ -> False; GT__ -> True }
+isLexConSym cs
+ | _NULL_ cs = False
+ | otherwise = c == ':'
+ || cs == SLIT("->")
+ where
+ c = _HEAD_ cs
-instance Ord3 RdrName where
- cmp = cmpRdr
+isLexVarSym cs
+ | _NULL_ cs = False
+ | otherwise = isSymbolASCII c
+ || isSymbolISO c
+ where
+ c = _HEAD_ cs
-instance NamedThing RdrName where
- -- We're sorta faking it here
- getName rdr_name
- = Global u rdr_name prov ex [rdr_name]
- where
- u = panic "NamedThing.RdrName:Unique"
- prov = panic "NamedThing.RdrName:Provenance"
- ex = panic "NamedThing.RdrName:ExportFlag"
+-------------
+isSymbolASCII c = c `elem` "!#$%&*+./<=>?@\\^|~-"
+isSymbolISO c = ord c `elem` (0xd7 : 0xf7 : [0xa1 .. 0xbf])
+isUpperISO (C# c#) = c# `geChar#` '\xc0'# && c# `leChar#` '\xde'# && c# `neChar#` '\xd7'#
+--0xc0 <= oc && oc <= 0xde && oc /= 0xd7 where oc = ord c
+isLowerISO (C# c#) = c# `geChar#` '\xdf'# && c# `leChar#` '\xff'# && c# `neChar#` '\xf7'#
+--0xdf <= oc && oc <= 0xff && oc /= 0xf7 where oc = ord c
+\end{code}
-instance Outputable RdrName where
- ppr sty (Unqual n) = pp_name sty n
- ppr sty (Qual m n) = ppBeside (pp_mod sty m) (pp_name sty n)
+\begin{code}
+mkTupNameStr 0 = (pREL_BASE, SLIT("()"))
+mkTupNameStr 1 = panic "Name.mkTupNameStr: 1 ???"
+mkTupNameStr 2 = (pREL_TUP, _PK_ "(,)") -- not strictly necessary
+mkTupNameStr 3 = (pREL_TUP, _PK_ "(,,)") -- ditto
+mkTupNameStr 4 = (pREL_TUP, _PK_ "(,,,)") -- ditto
+mkTupNameStr n = (pREL_TUP, _PK_ ("(" ++ nOfThem (n-1) ',' ++ ")"))
+
+mkUbxTupNameStr 0 = panic "Name.mkUbxTupNameStr: 0 ???"
+mkUbxTupNameStr 1 = (pREL_GHC, _PK_ "(# #)") -- 1 and 0 both make sense!!!
+mkUbxTupNameStr 2 = (pREL_GHC, _PK_ "(#,#)")
+mkUbxTupNameStr 3 = (pREL_GHC, _PK_ "(#,,#)")
+mkUbxTupNameStr 4 = (pREL_GHC, _PK_ "(#,,,#)")
+mkUbxTupNameStr n = (pREL_GHC, _PK_ ("(#" ++ nOfThem (n-1) ',' ++ "#)"))
+\end{code}
-pp_mod PprForC m = ppBesides [identToC m, ppPStr cSEP]
-pp_mod (PprForAsm False _) m = ppBesides [identToC m, ppPStr cSEP]
-pp_mod (PprForAsm True _) m = ppBesides [ppPStr cSEP, identToC m, ppPStr cSEP]
-pp_mod _ m = ppBesides [ppPStr m, ppChar '.']
-pp_name sty n | codeStyle sty = identToC n
- | otherwise = ppPStr n
+%************************************************************************
+%* *
+\subsection[Name-pieces-datatypes]{The @OccName@ datatypes}
+%* *
+%************************************************************************
-showRdr sty rdr = ppShow 100 (ppr sty rdr)
+\begin{code}
+data OccName = VarOcc FAST_STRING -- Variables and data constructors
+ | TvOcc FAST_STRING -- Type variables
+ | TCOcc FAST_STRING -- Type constructors and classes
+
+pprOccName :: OccName -> SDoc
+pprOccName n = getPprStyle $ \ sty ->
+ if codeStyle sty
+ then identToC (occNameString n)
+ else ptext (occNameString n)
+
+varOcc :: FAST_STRING -> OccName
+varOcc = VarOcc
+
+occNameString :: OccName -> FAST_STRING
+occNameString (VarOcc s) = s
+occNameString (TvOcc s) = s
+occNameString (TCOcc s) = s
+
+mapOccName :: (FAST_STRING -> FAST_STRING) -> OccName -> OccName
+mapOccName f (VarOcc s) = VarOcc (f s)
+mapOccName f (TvOcc s) = TvOcc (f s)
+mapOccName f (TCOcc s) = TCOcc (f s)
+
+prefixOccName :: FAST_STRING -> OccName -> OccName
+prefixOccName prefix (VarOcc s) = VarOcc (prefix _APPEND_ s)
+prefixOccName prefix (TvOcc s) = TvOcc (prefix _APPEND_ s)
+prefixOccName prefix (TCOcc s) = TCOcc (prefix _APPEND_ s)
+
+-- occNameFlavour is used only to generate good error messages, so it doesn't matter
+-- that the VarOcc case isn't mega-efficient. We could have different Occ constructors for
+-- data constructors and values, but that makes everything else a bit more complicated.
+occNameFlavour :: OccName -> String
+occNameFlavour (VarOcc s) | isLexConId s = "Data constructor"
+ | otherwise = "Value"
+occNameFlavour (TvOcc s) = "Type variable"
+occNameFlavour (TCOcc s) = "Type constructor or class"
+
+isVarOcc, isTCOcc, isTvOcc :: OccName -> Bool
+isVarOcc (VarOcc s) = True
+isVarOcc other = False
+
+isTvOcc (TvOcc s) = True
+isTvOcc other = False
+
+isTCOcc (TCOcc s) = True
+isTCOcc other = False
+
+instance Eq OccName where
+ a == b = case (a `compare` b) of { EQ -> True; _ -> False }
+ a /= b = case (a `compare` b) of { EQ -> False; _ -> True }
+
+instance Ord OccName where
+ a <= b = case (a `compare` b) of { LT -> True; EQ -> True; GT -> False }
+ a < b = case (a `compare` b) of { LT -> True; EQ -> False; GT -> False }
+ a >= b = case (a `compare` b) of { LT -> False; EQ -> True; GT -> True }
+ a > b = case (a `compare` b) of { LT -> False; EQ -> False; GT -> True }
+ compare a b = cmpOcc a b
+
+(VarOcc s1) `cmpOcc` (VarOcc s2) = s1 `compare` s2
+(VarOcc s1) `cmpOcc` other2 = LT
+
+(TvOcc s1) `cmpOcc` (VarOcc s2) = GT
+(TvOcc s1) `cmpOcc` (TvOcc s2) = s1 `compare` s2
+(TvOcc s1) `cmpOcc` other = LT
+
+(TCOcc s1) `cmpOcc` (TCOcc s2) = s1 `compare` s2
+(TCOcc s1) `cmpOcc` other = GT
+
+instance Outputable OccName where
+ ppr = pprOccName
\end{code}
+
%************************************************************************
%* *
-\subsection[Name-datatype]{The @Name@ datatype}
+\subsection[Name-datatype]{The @Name@ datatype, and name construction}
%* *
%************************************************************************
-
+
\begin{code}
data Name
= Local Unique
- FAST_STRING
- SrcLoc
+ (Maybe OccName) -- For ones that started life with a user name
| Global Unique
- RdrName -- original name; Unqual => prelude
- Provenance -- where it came from
- ExportFlag -- is it exported?
- [RdrName] -- ordered occurrence names (usually just one);
- -- first may be *un*qual.
+ Module -- The defining module
+ OccName -- Its name in that module
+ Provenance -- How it was defined
+\end{code}
+
+Things with a @Global@ name are given C static labels, so they finally
+appear in the .o file's symbol table. They appear in the symbol table
+in the form M.n. If originally-local things have this property they
+must be made @Global@ first.
+\begin{code}
data Provenance
- = LocalDef SrcLoc -- locally defined; give its source location
+ = NoProvenance
- | Imported ExportFlag -- how it was imported
- SrcLoc -- *original* source location
- [SrcLoc] -- any import source location(s)
+ | LocalDef -- Defined locally
+ SrcLoc -- Defn site
+ ExportFlag -- Whether it's exported
- | Implicit
- | Builtin
+ | NonLocalDef -- Defined non-locally
+ SrcLoc -- Defined non-locally; src-loc gives defn site
+ IfaceFlavour -- Whether the defn site is an .hi-boot file
+ PrintUnqualified
+
+ | WiredInTyCon TyCon -- There's a wired-in version
+ | WiredInId Id -- ...ditto...
+
+type PrintUnqualified = Bool -- True <=> the unqualified name of this thing is
+ -- in scope in this module, so print it
+ -- unqualified in error messages
\end{code}
-\begin{code}
-mkLocalName = Local
+Something is "Exported" if it may be mentioned by another module without
+warning. The crucial thing about Exported things is that they must
+never be dropped as dead code, even if they aren't used in this module.
+Furthermore, being Exported means that we can't see all call sites of the thing.
-mkTopLevName u orig locn exp occs = Global u orig (LocalDef locn) exp occs
-mkImportedName u orig imp locn imp_locs exp occs = Global u orig (Imported imp locn imp_locs) exp occs
+Exported things include:
-mkImplicitName :: Unique -> RdrName -> Name
-mkImplicitName u o = Global u o Implicit NotExported []
+ - explicitly exported Ids, including data constructors,
+ class method selectors
-mkBuiltinName :: Unique -> Module -> FAST_STRING -> Name
-mkBuiltinName u m n = Global u (Unqual n) Builtin NotExported []
+ - dfuns from instance decls
-mkCompoundName :: Unique -> [FAST_STRING] -> Name
-mkCompoundName u ns
- = Global u (Unqual{-???-} (_CONCAT_ (dotify ns))) Builtin{--} NotExported []
- where
- dotify [] = []
- dotify [n] = [n]
- dotify (n:ns) = n : (map (_CONS_ '.') ns)
-
-mkFunTyConName
- = mkBuiltinName funTyConKey pRELUDE_BUILTIN SLIT("->")
-mkTupleDataConName arity
- = mkBuiltinName (mkTupleDataConUnique arity) pRELUDE_BUILTIN (mkTupNameStr arity)
-mkTupleTyConName arity
- = mkBuiltinName (mkTupleTyConUnique arity) pRELUDE_BUILTIN (mkTupNameStr arity)
-
-mkTupNameStr 0 = SLIT("()")
-mkTupNameStr 1 = panic "Name.mkTupNameStr: 1 ???"
-mkTupNameStr 2 = SLIT("(,)") -- not strictly necessary
-mkTupNameStr 3 = SLIT("(,,)") -- ditto
-mkTupNameStr 4 = SLIT("(,,,)") -- ditto
-mkTupNameStr n
- = _PK_ ("(" ++ nOfThem (n-1) ',' ++ ")")
+Being Exported is *not* the same as finally appearing in the .o file's
+symbol table. For example, a local Id may be mentioned in an Exported
+Id's unfolding in the interface file, in which case the local Id goes
+out too.
- -- ToDo: what about module ???
- -- ToDo: exported when compiling builtin ???
+\begin{code}
+data ExportFlag = Exported | NotExported
+\end{code}
-isLocalName (Local _ _ _) = True
-isLocalName _ = False
+\begin{code}
+mkLocalName :: Unique -> OccName -> Name
+mkLocalName uniq occ = Local uniq (Just occ)
-isImplicitName (Global _ _ Implicit _ _) = True
-isImplicitName _ = False
+mkGlobalName :: Unique -> Module -> OccName -> Provenance -> Name
+mkGlobalName = Global
-isBuiltinName (Global _ _ Builtin _ _) = True
-isBuiltinName _ = False
-\end{code}
+mkSysLocalName :: Unique -> Name
+mkSysLocalName uniq = Local uniq Nothing
+mkWiredInIdName :: Unique -> Module -> FAST_STRING -> Id -> Name
+mkWiredInIdName uniq mod occ id
+ = Global uniq mod (VarOcc occ) (WiredInId id)
+mkWiredInTyConName :: Unique -> Module -> FAST_STRING -> TyCon -> Name
+mkWiredInTyConName uniq mod occ tycon
+ = Global uniq mod (TCOcc occ) (WiredInTyCon tycon)
-%************************************************************************
-%* *
-\subsection[Name-instances]{Instance declarations}
-%* *
-%************************************************************************
-\begin{code}
-cmpName n1 n2 = c n1 n2
- where
- c (Local u1 _ _) (Local u2 _ _) = cmp u1 u2
- c (Global u1 _ _ _ _) (Global u2 _ _ _ _) = cmp u1 u2
+mkCompoundName :: (OccName -> OccName)
+ -> Unique -- New unique
+ -> Name -- Base name
+ -> Name -- Result is always a value name
+
+mkCompoundName f uniq (Global _ mod occ prov)
+ = Global uniq mod (f occ) prov
+
+mkCompoundName f uniq (Local _ (Just occ))
+ = Local uniq (Just (f occ))
- c other_1 other_2 -- the tags *must* be different
- = let tag1 = tag_Name n1
- tag2 = tag_Name n2
- in
- if tag1 _LT_ tag2 then LT_ else GT_
+mkCompoundName f uniq (Local _ Nothing)
+ = Local uniq Nothing
- tag_Name (Local _ _ _) = (ILIT(1) :: FAST_INT)
- tag_Name (Global _ _ _ _ _) = ILIT(2)
+setNameProvenance :: Name -> Provenance -> Name
+ -- setNameProvenance used to only change the provenance of
+ -- Implicit-provenance things, but that gives bad error messages
+ -- for names defined twice in the same module, so I changed it to
+ -- set the provenance of *any* global (SLPJ Jun 97)
+setNameProvenance (Global uniq mod occ _) prov = Global uniq mod occ prov
+setNameProvenance other_name prov = other_name
+
+getNameProvenance :: Name -> Provenance
+getNameProvenance (Global uniq mod occ prov) = prov
+getNameProvenance (Local uniq occ) = LocalDef noSrcLoc NotExported
+
+-- When we renumber/rename things, we need to be
+-- able to change a Name's Unique to match the cached
+-- one in the thing it's the name of. If you know what I mean.
+changeUnique (Local _ n ) u = Local u n
+changeUnique (Global _ mod occ prov) u = Global u mod occ prov
\end{code}
-\begin{code}
-instance Eq Name where
- a == b = case (a `cmp` b) of { EQ_ -> True; _ -> False }
- a /= b = case (a `cmp` b) of { EQ_ -> False; _ -> True }
+setNameVisibility is applied to names in the final program
-instance Ord Name where
- a <= b = case (a `cmp` b) of { LT_ -> True; EQ_ -> True; GT__ -> False }
- a < b = case (a `cmp` b) of { LT_ -> True; EQ_ -> False; GT__ -> False }
- a >= b = case (a `cmp` b) of { LT_ -> False; EQ_ -> True; GT__ -> True }
- a > b = case (a `cmp` b) of { LT_ -> False; EQ_ -> False; GT__ -> True }
+The Maybe Module argument is (Just mod) for top-level values,
+and Nothing for all others (local values and type variables)
-instance Ord3 Name where
- cmp = cmpName
+For top-level things, it globalises Local names
+ (if all top-level things should be visible)
+ and localises non-exported Global names
+ (if only exported things should be visible)
-instance Uniquable Name where
- uniqueOf = nameUnique
+For nested things it localises Global names.
-instance NamedThing Name where
- getName n = n
-\end{code}
+In all cases except an exported global, it gives it a new occurrence name.
+
+The "visibility" here concerns whether the .o file's symbol table
+mentions the thing; if so, it needs a module name in its symbol.
+The Global things are "visible" and the Local ones are not
+
+Why should things be "visible"? Certainly they must be if they
+are exported. But also:
+
+(a) In certain (prelude only) modules we split up the .hc file into
+ lots of separate little files, which are separately compiled by the C
+ compiler. That gives lots of little .o files. The idea is that if
+ you happen to mention one of them you don't necessarily pull them all
+ in. (Pulling in a piece you don't need can be v bad, because it may
+ mention other pieces you don't need either, and so on.)
+
+ Sadly, splitting up .hc files means that local names (like s234) are
+ now globally visible, which can lead to clashes between two .hc
+ files. So unlocaliseWhatnot goes through making all the local things
+ into global things, essentially by giving them full names so when they
+ are printed they'll have their module name too. Pretty revolting
+ really.
+
+(b) When optimisation is on we want to make all the internal
+ top-level defns externally visible
\begin{code}
-nameUnique (Local u _ _) = u
-nameUnique (Global u _ _ _ _) = u
+setNameVisibility :: Maybe Module -> Unique -> Name -> Name
-nameOrigName (Local _ n _) = Unqual n
-nameOrigName (Global _ orig _ _ _) = orig
+setNameVisibility maybe_mod uniq name@(Global _ mod occ (LocalDef loc NotExported))
+ | not all_toplev_ids_visible || not_top_level maybe_mod
+ = Local uniq Nothing -- Localise Global name
-nameModuleNamePair (Local _ n _) = (panic "nameModuleNamePair", n)
-nameModuleNamePair (Global _ (Unqual n) _ _ _) = (pRELUDE, n)
-nameModuleNamePair (Global _ (Qual m n) _ _ _) = (m, n)
+setNameVisibility maybe_mod uniq name@(Global _ _ _ _)
+ = name -- Otherwise don't fiddle with Global
-nameOccName (Local _ n _) = Unqual n
-nameOccName (Global _ orig _ _ [] ) = orig
-nameOccName (Global _ orig _ _ occs) = head occs
+setNameVisibility (Just mod) uniq (Local _ _)
+ | all_toplev_ids_visible
+ = Global uniq mod -- Globalise Local name
+ (uniqToOccName uniq)
+ (LocalDef noSrcLoc NotExported)
-nameExportFlag (Local _ _ _) = NotExported
-nameExportFlag (Global _ _ _ exp _) = exp
+setNameVisibility maybe_mod uniq (Local _ _)
+ = Local uniq Nothing -- New unique for Local; zap its occ
-nameSrcLoc (Local _ _ loc) = loc
-nameSrcLoc (Global _ _ (LocalDef loc) _ _) = loc
-nameSrcLoc (Global _ _ (Imported _ loc _) _ _) = loc
-nameSrcLoc (Global _ _ Implicit _ _) = mkUnknownSrcLoc
-nameSrcLoc (Global _ _ Builtin _ _) = mkBuiltinSrcLoc
-
-nameImpLocs (Global _ _ (Imported _ _ locs) _ _) = locs
-nameImpLocs _ = []
-
-nameImportFlag (Local _ _ _) = NotExported
-nameImportFlag (Global _ _ (LocalDef _) _ _) = ExportAll
-nameImportFlag (Global _ _ (Imported exp _ _) _ _) = exp
-nameImportFlag (Global _ _ Implicit _ _) = ExportAll
-nameImportFlag (Global _ _ Builtin _ _) = ExportAll
-
-isLocallyDefinedName (Local _ _ _) = True
-isLocallyDefinedName (Global _ _ (LocalDef _) _ _) = True
-isLocallyDefinedName (Global _ _ (Imported _ _ _) _ _) = False
-isLocallyDefinedName (Global _ _ Implicit _ _) = False
-isLocallyDefinedName (Global _ _ Builtin _ _) = False
-
-isPreludeDefinedName (Local _ n _) = False
-isPreludeDefinedName (Global _ orig _ _ _) = isUnqual orig
-\end{code}
+-- make the Name globally visible regardless.
+mkNameVisible :: Module -> Unique -> Name -> Name
+mkNameVisible mod occ_uniq nm@(Global _ _ _ _) = nm
+mkNameVisible mod occ_uniq nm@(Local uniq occ)
+ = Global uniq mod (uniqToOccName occ_uniq) (LocalDef noSrcLoc Exported)
-\begin{code}
-instance Outputable Name where
-#ifdef DEBUG
- ppr PprDebug (Local u n _) = pp_debug u (ppPStr n)
- ppr PprDebug (Global u o _ _ _) = pp_debug u (ppr PprDebug o)
-#endif
- ppr sty (Local u n _) = pp_name sty n
- ppr PprForUser (Global u o _ _ [] ) = ppr PprForUser o
- ppr PprForUser (Global u o _ _ occs) = ppr PprForUser (head occs)
- ppr PprShowAll (Global u o prov exp occs) = pp_all o prov exp occs
- ppr sty (Global u o _ _ _) = ppr sty o
-
-pp_debug uniq thing
- = ppBesides [thing, ppStr "{-", pprUnique uniq, ppStr "-}" ]
-
-pp_all orig prov exp occs
- = ppBesides [ppr PprShowAll orig, ppr PprShowAll occs, pp_prov prov, pp_exp exp]
-
-pp_exp NotExported = ppNil
-pp_exp ExportAll = ppPStr SLIT("/EXP(..)")
-pp_exp ExportAbs = ppPStr SLIT("/EXP")
-
-pp_prov Implicit = ppPStr SLIT("/IMPLICIT")
-pp_prov Builtin = ppPStr SLIT("/BUILTIN")
-pp_prov _ = ppNil
+uniqToOccName uniq = VarOcc (_PK_ ('_':show uniq))
+ -- The "_" is to make sure that this OccName is distinct from all user-defined ones
+
+not_top_level (Just m) = False
+not_top_level Nothing = True
+
+all_toplev_ids_visible =
+ not opt_OmitInterfacePragmas || -- Pragmas can make them visible
+ opt_EnsureSplittableC -- Splitting requires visiblilty
\end{code}
%************************************************************************
%* *
-\subsection[ExportFlag-datatype]{The @ExportFlag@ datatype}
+\subsection{Predicates and selectors}
%* *
%************************************************************************
-The export flag @ExportAll@ means `export all there is', so there are
-times when it is attached to a class or data type which has no
-ops/constructors (if the class/type was imported abstractly). In
-fact, @ExportAll@ is attached to everything except to classes/types
-which are being {\em exported} abstractly, regardless of how they were
-imported.
-
\begin{code}
-data ExportFlag
- = ExportAll -- export with all constructors/methods
- | ExportAbs -- export abstractly (tycons/classes only)
- | NotExported
+nameUnique :: Name -> Unique
+nameModAndOcc :: Name -> (Module, OccName) -- Globals only
+nameOccName :: Name -> OccName
+nameModule :: Name -> Module
+nameSrcLoc :: Name -> SrcLoc
+isLocallyDefinedName :: Name -> Bool
+isExportedName :: Name -> Bool
+isWiredInName :: Name -> Bool
+isLocalName :: Name -> Bool
+isGlobalName :: Name -> Bool
+isExternallyVisibleName :: Name -> Bool
+
+
+
+nameUnique (Local u _) = u
+nameUnique (Global u _ _ _) = u
+
+nameOccName (Local _ (Just occ)) = occ
+nameOccName (Local uniq Nothing) = pprPanic "nameOccName" (ppr uniq)
+nameOccName (Global _ _ occ _) = occ
+
+nameModule (Global _ mod occ _) = mod
+
+nameModAndOcc (Global _ mod occ _) = (mod,occ)
+
+isExportedName (Global _ _ _ (LocalDef _ Exported)) = True
+isExportedName other = False
+
+nameSrcLoc (Local _ _) = noSrcLoc
+nameSrcLoc (Global _ _ _ (LocalDef loc _)) = loc
+nameSrcLoc (Global _ _ _ (NonLocalDef loc _ _)) = loc
+nameSrcLoc (Global _ _ _ (WiredInTyCon _)) = mkBuiltinSrcLoc
+nameSrcLoc (Global _ _ _ (WiredInId _)) = mkBuiltinSrcLoc
+nameSrcLoc other = noSrcLoc
+
+isLocallyDefinedName (Local _ _) = True
+isLocallyDefinedName (Global _ _ _ (LocalDef _ _)) = True
+isLocallyDefinedName other = False
+
+-- Things the compiler "knows about" are in some sense
+-- "imported". When we are compiling the module where
+-- the entities are defined, we need to be able to pick
+-- them out, often in combination with isLocallyDefined.
+isWiredInName (Global _ _ _ (WiredInTyCon _)) = True
+isWiredInName (Global _ _ _ (WiredInId _)) = True
+isWiredInName _ = False
+
+maybeWiredInIdName :: Name -> Maybe Id
+maybeWiredInIdName (Global _ _ _ (WiredInId id)) = Just id
+maybeWiredInIdName other = Nothing
-exportFlagOn NotExported = False
-exportFlagOn _ = True
+maybeWiredInTyConName :: Name -> Maybe TyCon
+maybeWiredInTyConName (Global _ _ _ (WiredInTyCon tc)) = Just tc
+maybeWiredInTyConName other = Nothing
-isExported a = exportFlagOn (getExportFlag a)
+
+isLocalName (Local _ _) = True
+isLocalName _ = False
+
+isSysLocalName (Local _ Nothing) = True
+isSysLocalName other = False
+
+isGlobalName (Global _ _ _ _) = True
+isGlobalName other = False
+
+-- Global names are by definition those that are visible
+-- outside the module, *as seen by the linker*. Externally visible
+-- does not mean visible at the source level (that's isExported).
+isExternallyVisibleName name = isGlobalName name
\end{code}
+
%************************************************************************
%* *
-\subsection{Overloaded functions related to Names}
+\subsection[Name-instances]{Instance declarations}
%* *
%************************************************************************
\begin{code}
-class NamedThing a where
- getName :: a -> Name
+cmpName n1 n2 = c n1 n2
+ where
+ c (Local u1 _) (Local u2 _) = compare u1 u2
+ c (Local _ _) _ = LT
+ c (Global u1 _ _ _) (Global u2 _ _ _) = compare u1 u2
+ c (Global _ _ _ _) _ = GT
\end{code}
\begin{code}
-origName :: NamedThing a => a -> RdrName
-moduleOf :: RdrName -> Module
-nameOf :: RdrName -> FAST_STRING
-moduleNamePair :: NamedThing a => a -> (Module, FAST_STRING)
-
-getOccName :: NamedThing a => a -> RdrName
-getLocalName :: NamedThing a => a -> FAST_STRING
-getExportFlag :: NamedThing a => a -> ExportFlag
-getSrcLoc :: NamedThing a => a -> SrcLoc
-getImpLocs :: NamedThing a => a -> [SrcLoc]
-isLocallyDefined :: NamedThing a => a -> Bool
-isPreludeDefined :: NamedThing a => a -> Bool
+instance Eq Name where
+ a == b = case (a `compare` b) of { EQ -> True; _ -> False }
+ a /= b = case (a `compare` b) of { EQ -> False; _ -> True }
--- ToDo: specialise for RdrNames?
-origName = nameOrigName . getName
-moduleNamePair = nameModuleNamePair . getName
+instance Ord Name where
+ a <= b = case (a `compare` b) of { LT -> True; EQ -> True; GT -> False }
+ a < b = case (a `compare` b) of { LT -> True; EQ -> False; GT -> False }
+ a >= b = case (a `compare` b) of { LT -> False; EQ -> True; GT -> True }
+ a > b = case (a `compare` b) of { LT -> False; EQ -> False; GT -> True }
+ compare a b = cmpName a b
-moduleOf (Unqual n) = pRELUDE
-moduleOf (Qual m n) = m
+instance Uniquable Name where
+ getUnique = nameUnique
-nameOf (Unqual n) = n
-nameOf (Qual m n) = n
+instance NamedThing Name where
+ getName n = n
+\end{code}
-getLocalName = nameOf . origName
-getOccName = nameOccName . getName
-getExportFlag = nameExportFlag . getName
-getSrcLoc = nameSrcLoc . getName
-getImpLocs = nameImpLocs . getName
-isLocallyDefined = isLocallyDefinedName . getName
-isPreludeDefined = isPreludeDefinedName . getName
-\end{code}
+%************************************************************************
+%* *
+\subsection[Special-Names]{Special Kinds of names}
+%* *
+%************************************************************************
-@ltLexical@ is used for sorting things into lexicographical order, so
-as to canonicalize interfaces. [Regular @(<)@ should be used for fast
-comparison.]
+Here's our convention for splitting up the object file name space:
-\begin{code}
-a `ltLexical` b = origName a < origName b
-\end{code}
+ _d... dictionary identifiers
+ _g... externally visible (non-user visible) names
-These functions test strings to see if they fit the lexical categories
-defined in the Haskell report. Normally applied as in e.g. @isCon
-(getLocalName foo)@.
+ _m... default methods
+ _n... default methods (encoded symbols, eg. <= becomes _nle)
-\begin{code}
-isLexCon, isLexVar, isLexId, isLexSym, isLexConId, isLexConSym,
- isLexVarId, isLexVarSym, isLexSpecialSym :: FAST_STRING -> Bool
+ _p... superclass selectors
-isLexCon cs = isLexConId cs || isLexConSym cs
-isLexVar cs = isLexVarId cs || isLexVarSym cs
+ _w... workers
+ _v... workers (encoded symbols)
-isLexId cs = isLexConId cs || isLexVarId cs
-isLexSym cs = isLexConSym cs || isLexVarSym cs
+ _x... local variables
--------------
+ _u... user-defined names that previously began with '_'
-isLexConId cs
- | _NULL_ cs = False
- | c == '_' = isLexConId (_TAIL_ cs) -- allow for leading _'s
- | otherwise = isUpper c || isUpperISO c
- where
- c = _HEAD_ cs
+ _[A-Z]... compiler-generated tycons/datacons (namely dictionary
+ constructors)
-isLexVarId cs
- | _NULL_ cs = False
- | c == '_' = isLexVarId (_TAIL_ cs) -- allow for leading _'s
- | otherwise = isLower c || isLowerISO c
- where
- c = _HEAD_ cs
+ __.... keywords (__export, __letrec etc.)
-isLexConSym cs
- | _NULL_ cs = False
- | otherwise = c == ':'
--- || c == '(' -- (), (,), (,,), ...
- || cs == SLIT("->")
--- || cs == SLIT("[]")
- where
- c = _HEAD_ cs
+This knowledge is encoded in the following functions.
-isLexVarSym cs
- | _NULL_ cs = False
- | otherwise = isSymbolASCII c
- || isSymbolISO c
--- || c == '(' -- (), (,), (,,), ...
--- || cs == SLIT("[]")
- where
- c = _HEAD_ cs
+\begin{code}
+dictNamePrefix :: FAST_STRING
+dictNamePrefix = SLIT("_d")
+
+mkSuperDictSelName :: Int -> OccName -> OccName
+mkSuperDictSelName index = prefixOccName (_PK_ ("_p" ++ show index ++ "_"))
+
+mkWorkerName :: OccName -> OccName
+mkWorkerName nm
+ | isLexSym nm_str =
+ prefixOccName SLIT("_v") (mapOccName trName nm)
+ | otherwise =
+ prefixOccName SLIT("_w") nm
+ where nm_str = occNameString nm
+
+mkDefaultMethodName :: OccName -> OccName
+mkDefaultMethodName nm
+ | isLexSym nm_str =
+ prefixOccName SLIT("_n") (mapOccName trName nm)
+ | otherwise =
+ prefixOccName SLIT("_m") nm
+ where nm_str = occNameString nm
+
+-- not used yet:
+--mkRecordSelectorName :: Name -> Name
+--mkMethodSelectorName :: Name -> Name
+
+mkClassTyConStr, mkClassDataConStr :: FAST_STRING -> FAST_STRING
+
+mkClassTyConStr s = SLIT("_") _APPEND_ s
+mkClassDataConStr s = SLIT("_") _APPEND_ s
+
+-- translate a string such that it can occur as *part* of an identifer. This
+-- is used when we prefix identifiers to create new names, for example the
+-- name of a default method.
+
+trName :: FAST_STRING -> FAST_STRING
+trName nm = _PK_ (foldr tran "" (_UNPK_ nm))
+ where
+ tran c cs = case trChar c of
+ '\0' -> '_' : show (ord c) ++ cs
+ c' -> c' : cs
+ trChar '&' = 'a'
+ trChar '|' = 'b'
+ trChar ':' = 'c'
+ trChar '/' = 'd'
+ trChar '=' = 'e'
+ trChar '>' = 'g'
+ trChar '#' = 'h'
+ trChar '@' = 'i'
+ trChar '<' = 'l'
+ trChar '-' = 'm'
+ trChar '!' = 'n'
+ trChar '+' = 'p'
+ trChar '\'' = 'q'
+ trChar '$' = 'r'
+ trChar '?' = 's'
+ trChar '*' = 't'
+ trChar '_' = 'u'
+ trChar '.' = 'v'
+ trChar '\\' = 'w'
+ trChar '%' = 'x'
+ trChar '~' = 'y'
+ trChar '^' = 'z'
+ trChar _ = '\0'
+\end{code}
-isLexSpecialSym cs
- | _NULL_ cs = False
- | otherwise = c == '(' -- (), (,), (,,), ...
- || cs == SLIT("[]")
- where
- c = _HEAD_ cs
+%************************************************************************
+%* *
+\subsection{Pretty printing}
+%* *
+%************************************************************************
--------------
-isSymbolASCII c = c `elem` "!#$%&*+./<=>?@\\^|~-"
-isSymbolISO c = ord c `elem` (0xd7 : 0xf7 : [0xa1 .. 0xbf])
-isUpperISO c = 0xc0 <= oc && oc <= 0xde && oc /= 0xd7 where oc = ord c
-isLowerISO c = 0xdf <= oc && oc <= 0xff && oc /= 0xf7 where oc = ord c
+\begin{code}
+instance Outputable Name where
+ -- When printing interfaces, all Locals have been given nice print-names
+ ppr name = pprName name
+
+pprName name
+ = getPprStyle $ \ sty ->
+ let
+ -- when printing local names for interface files, prepend the '_'
+ -- to avoid clashes with user-defined names. In fact, these names
+ -- will always begin with 'g' for top-level ids and 'x' otherwise,
+ -- because these are the unique supplies going into the tidy phase.
+ ppr (Local u n) | codeStyle sty = pprUnique u
+ | ifaceStyle sty = char '_' <> pprUnique u
+
+ ppr (Local u Nothing) = pprUnique u
+ ppr (Local u (Just occ)) | userStyle sty = ptext (occNameString occ)
+ | otherwise = ptext (occNameString occ) <> char '_' <> pprUnique u
+
+ ppr name@(Global u m n prov)
+ | codeStyle sty
+ = identToC (m _APPEND_ SLIT(".") _APPEND_ occNameString n)
+
+ | otherwise
+ = hcat [pp_mod_dot, ptext (occNameString n), pp_debug sty name]
+ where
+ pp_mod_dot
+ = case prov of -- Omit home module qualifier if in scope
+ LocalDef _ _ -> pp_qual dot (user_sty || iface_sty)
+ NonLocalDef _ hif omit -> pp_qual (pp_hif hif) (omit && user_sty)
+ -- Hack: omit qualifers on wired in things
+ -- in user style only
+ WiredInTyCon _ -> pp_qual dot user_sty
+ WiredInId _ -> pp_qual dot user_sty
+ NoProvenance -> pp_qual dot False
+
+ pp_qual sep omit_qual
+ | omit_qual = empty
+ | otherwise = pprModule m <> sep
+
+ dot = text "."
+ pp_hif HiFile = dot -- Vanilla case
+ pp_hif HiBootFile = text "!" -- M!t indicates a name imported from a .hi-boot interface
+
+ user_sty = userStyle sty
+ iface_sty = ifaceStyle sty
+ in
+ ppr name
+
+
+pp_debug sty (Global uniq m n prov)
+ | debugStyle sty = hcat [text "{-", pprUnique uniq, prov_p, text "-}"]
+ | otherwise = empty
+ where
+ prov_p | opt_PprStyle_NoPrags = empty
+ | otherwise = comma <> pp_prov prov
+
+pp_prov (LocalDef _ Exported) = char 'x'
+pp_prov (LocalDef _ NotExported) = char 'l'
+pp_prov (NonLocalDef _ _ _) = char 'n'
+pp_prov (WiredInTyCon _) = char 'W'
+pp_prov (WiredInId _) = char 'w'
+pp_prov NoProvenance = char '?'
+
+-- pprNameProvenance is used in error messages to say where a name came from
+pprNameProvenance :: Name -> SDoc
+pprNameProvenance (Local _ _) = pprProvenance (LocalDef noSrcLoc NotExported)
+pprNameProvenance (Global _ _ _ prov) = pprProvenance prov
+
+pprProvenance :: Provenance -> SDoc
+pprProvenance (LocalDef loc _) = ptext SLIT("Locally defined at") <+> ppr loc
+pprProvenance (NonLocalDef loc _ _) = ptext SLIT("Non-locally defined at") <+> ppr loc
+pprProvenance (WiredInTyCon tc) = ptext SLIT("Wired-in tycon")
+pprProvenance (WiredInId id) = ptext SLIT("Wired-in id")
+pprProvenance NoProvenance = ptext SLIT("No provenance")
\end{code}
-And one ``higher-level'' interface to those:
+
+%************************************************************************
+%* *
+\subsection{Overloaded functions related to Names}
+%* *
+%************************************************************************
\begin{code}
-isSymLexeme :: NamedThing a => a -> Bool
+class NamedThing a where
+ getOccName :: a -> OccName -- Even RdrNames can do this!
+ getName :: a -> Name
+
+ getOccName n = nameOccName (getName n) -- Default method
+\end{code}
-isSymLexeme v
- = let str = nameOf (origName v) in isLexSym str
+\begin{code}
+modAndOcc :: NamedThing a => a -> (Module, OccName)
+getSrcLoc :: NamedThing a => a -> SrcLoc
+isLocallyDefined :: NamedThing a => a -> Bool
+isExported :: NamedThing a => a -> Bool
+getOccString :: NamedThing a => a -> String
--- print `vars`, (op) correctly
-pprSym, pprNonSym :: (NamedThing name, Outputable name) => PprStyle -> name -> Pretty
+modAndOcc = nameModAndOcc . getName
+isExported = isExportedName . getName
+getSrcLoc = nameSrcLoc . getName
+isLocallyDefined = isLocallyDefinedName . getName
+getOccString x = _UNPK_ (occNameString (getOccName x))
+\end{code}
-pprSym sty var
- = let
- str = nameOf (origName var)
- in
- if isLexSym str && not (isLexSpecialSym str)
- then ppr sty var
- else ppBesides [ppChar '`', ppr sty var, ppChar '`']
-
-pprNonSym sty var
- = if isSymLexeme var
- then ppParens (ppr sty var)
- else ppr sty var
+\begin{code}
+{-# SPECIALIZE isLocallyDefined
+ :: Name -> Bool
+ #-}
\end{code}
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