2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
4 \section[RnUtils]{Functions used by both renaming passes}
7 #include "HsVersions.h"
10 SYN_IE(RnEnv), SYN_IE(QualNames),
11 SYN_IE(UnqualNames), SYN_IE(ScopeStack),
12 emptyRnEnv, initRnEnv, extendGlobalRnEnv, extendLocalRnEnv,
13 lookupRnEnv, lookupGlobalRnEnv, lookupTcRnEnv,
20 pprRnEnv -- debugging only
24 IMPORT_1_3(List(partition))
26 import Bag ( Bag, emptyBag, snocBag, unionBags )
27 import CmdLineOpts ( opt_GlasgowExts )
28 import ErrUtils ( addShortErrLocLine )
29 import FiniteMap ( emptyFM, isEmptyFM, fmToList, listToFM, keysFM,
30 lookupFM, addListToFM, addToFM, eltsFM, FiniteMap )
31 import Maybes ( maybeToBool )
32 import Name ( RdrName(..), ExportFlag(..),
33 isQual, pprNonSym, getLocalName, isLocallyDefined )
34 import PprStyle ( PprStyle(..) )
35 import PrelInfo ( builtinValNamesMap, builtinTcNamesMap )
36 import PrelMods ( gHC_BUILTINS )
38 import RnHsSyn ( RnName )
39 import Util ( assertPanic )
42 *********************************************************
44 \subsection{RnEnv: renaming environment}
46 *********************************************************
48 Separate FiniteMaps are kept for lookup up Qual names,
49 Unqual names and Local names.
52 type RnEnv = ((QualNames, UnqualNames, QualNames, UnqualNames), ScopeStack)
54 type QualNames = FiniteMap (FAST_STRING,Module) RnName
55 type UnqualNames = FiniteMap FAST_STRING RnName
56 type ScopeStack = FiniteMap FAST_STRING RnName
60 extendGlobalRnEnv :: RnEnv -> [(RdrName,RnName)] -> [(RdrName,RnName)]
61 -> (RnEnv, Bag (RdrName, RnName, RnName))
62 extendLocalRnEnv :: Bool -> RnEnv -> [RnName] -> (RnEnv, [RnName])
63 lookupRnEnv :: RnEnv -> RdrName -> Maybe RnName
64 lookupGlobalRnEnv :: RnEnv -> RdrName -> Maybe RnName
65 lookupTcRnEnv :: RnEnv -> RdrName -> Maybe RnName
67 getLocalsFromRnEnv :: RnEnv -> ([RnName], [RnName])
68 -- grabs the locally defined names from the unqual envs
71 If the @RdrName@ is a @Qual@, @lookupValue@ looks it up in the global
72 value QualNames. If it is @Unqual@, it looks it up first in the
73 ScopeStack, and if it isn't found there, then in the global
76 @lookupTcRnEnv@ looks up tycons/classes in the alternative global
79 @extendGlobalRnEnv@ adds global names to the RnEnv. It takes separate
80 value and tycon/class name lists. It returns any duplicate names
83 @extendRnEnv@ adds new local names to the ScopeStack in an RnEnv.
84 It optionally reports any shadowed names.
87 emptyRnEnv = ((emptyFM, emptyFM, emptyFM, emptyFM), emptyFM)
89 -- an emptyRnEnv is empty; the initRnEnv may have
90 -- primitive names already in it (both unqual and qual),
91 -- and quals for all the other wired-in dudes.
94 = if (not opt_GlasgowExts) then
97 ((listToFM qual, listToFM unqual, listToFM tc_qual, listToFM tc_unqual), emptyFM)
99 qual = [ ((n,m), rn) | (OrigName m n, rn) <- fmToList builtinValNamesMap ]
100 tc_qual = [ ((n,m), rn) | (OrigName m n, rn) <- fmToList builtinTcNamesMap ]
102 builtin_qual = filter (\ ((_,m),_) -> m == gHC_BUILTINS) qual
103 builtin_tc_qual = filter (\ ((_,m),_) -> m == gHC_BUILTINS) tc_qual
105 unqual = map (\ ((n,_),rn) -> (n,rn)) builtin_qual
106 tc_unqual = map (\ ((n,_),rn) -> (n,rn)) builtin_tc_qual
110 extendGlobalRnEnv ((qual, unqual, tc_qual, tc_unqual), stack) val_list tc_list
111 = ASSERT(isEmptyFM stack)
112 (((qual', unqual', tc_qual', tc_unqual'), stack), tc_dups `unionBags` dups)
114 (qual', unqual', dups) = extend_global qual unqual val_list
115 (tc_qual', tc_unqual', tc_dups) = extend_global tc_qual tc_unqual tc_list
117 extend_global qual unqual rdr_list = (qual', unqual', dups)
119 (qual_list, unqual_list) = partition (isQual.fst) rdr_list
120 qual_in = map mk_qual qual_list
121 unqual_in = map mk_unqual unqual_list
122 mk_qual (Qual m s, rn) = ((s,m), rn)
123 mk_unqual (Unqual s, rn) = (s, rn)
125 (qual', qual_dups) = do_dups qual_in qual emptyBag (\ (s,m) -> Qual m s)
126 (unqual', unqual_dups) = do_dups unqual_in unqual emptyBag Unqual
128 dups = unqual_dups `unionBags` qual_dups
130 do_dups [] fm dups to_rdr = (fm, dups)
131 do_dups ((k,v):rest) fm dups to_rdr
132 = case lookupFM fm k of
133 Nothing -> do_dups rest (addToFM fm k v) dups to_rdr
134 Just cur -> do_dups rest fm (dups `snocBag` (to_rdr k, cur, v)) to_rdr
137 extendLocalRnEnv report_shadows (global, stack) new_local
138 = ((global, new_stack), dups)
140 (new_stack, dups) = extend new_local stack
143 = if report_shadows then
144 do_shadows names stack []
146 (addListToFM stack [ (getLocalName n, n) | n <- names], [])
148 do_shadows [] stack dups = (stack, dups)
149 do_shadows (name:names) stack dups
150 = do_shadows names (addToFM stack str name) ext_dups
152 str = getLocalName name
153 ext_dups = if maybeToBool (lookupFM stack str)
159 lookupRnEnv ((qual, unqual, _, _), stack) rdr
161 Unqual str -> lookup stack str (lookupFM unqual str)
162 Qual mod str -> lookupFM qual (str,mod)
164 lookup fm thing do_on_fail
165 = case lookupFM fm thing of
166 found@(Just name) -> found
167 Nothing -> do_on_fail
169 lookupGlobalRnEnv ((qual, unqual, _, _), _) rdr
171 Unqual str -> lookupFM unqual str
172 Qual mod str -> lookupFM qual (str,mod)
174 lookupTcRnEnv ((_, _, tc_qual, tc_unqual), _) rdr
176 Unqual str -> lookupFM tc_unqual str
177 Qual mod str -> lookupFM tc_qual (str,mod)
179 getLocalsFromRnEnv ((_, vals, _, tcs), _)
180 = (filter isLocallyDefined (eltsFM vals),
181 filter isLocallyDefined (eltsFM tcs))
184 *********************************************************
186 \subsection{Export Flag Functions}
188 *********************************************************
191 lubExportFlag ExportAll ExportAll = ExportAll
192 lubExportFlag ExportAll ExportAbs = ExportAll
193 lubExportFlag ExportAbs ExportAll = ExportAll
194 lubExportFlag ExportAbs ExportAbs = ExportAbs
197 *********************************************************
199 \subsection{Errors used *more than once* in the renamer}
201 *********************************************************
204 qualNameErr descriptor (name,locn)
205 = addShortErrLocLine locn ( \ sty ->
206 ppBesides [ppStr "invalid use of qualified ", ppStr descriptor, ppStr ": ", pprNonSym sty name ] )
208 dupNamesErr descriptor ((name1,locn1) : dup_things) sty
209 = ppAboves (item1 : map dup_item dup_things)
212 = addShortErrLocLine locn1 (\ sty ->
213 ppBesides [ppStr "multiple declarations of a ", ppStr descriptor, ppStr " `",
214 pprNonSym sty name1, ppStr "'" ]) sty
216 dup_item (name, locn)
217 = addShortErrLocLine locn (\ sty ->
218 ppBesides [ppStr "here was another declaration of `",
219 pprNonSym sty name, ppStr "'" ]) sty
222 pprRnEnv :: PprStyle -> RnEnv -> Pretty
224 pprRnEnv sty ((qual, unqual, tc_qual, tc_unqual), stack)
225 = ppAboves [ ppStr "Stack:"
226 , ppCat (map ppPStr (keysFM stack))
228 , ppAboves [ppBesides [ppPStr m, ppChar '.', ppPStr n] | (n,m) <- keysFM qual]
229 , ppStr "Val unqual:"
230 , ppCat (map ppPStr (keysFM unqual))
232 , ppAboves [ppBesides [ppPStr m, ppChar '.', ppPStr n] | (n,m) <- keysFM tc_qual]
234 , ppCat (map ppPStr (keysFM tc_unqual))