module IfaceEnv (
newGlobalBinder, newIPName, newImplicitBinder,
lookupIfaceTop, lookupIfaceExt,
- lookupOrig, lookupIfaceTc,
+ lookupOrig, lookupAvail, lookupIfaceTc,
newIfaceName, newIfaceNames,
extendIfaceIdEnv, extendIfaceTyVarEnv,
tcIfaceLclId, tcIfaceTyVar,
import TcRnMonad
import IfaceType ( IfaceExtName(..), IfaceTyCon(..), ifaceTyConName )
import TysWiredIn ( tupleTyCon, tupleCon )
-import HscTypes ( NameCache(..), HscEnv(..), OrigNameCache )
+import HscTypes ( NameCache(..), HscEnv(..), GenAvailInfo(..), OrigNameCache )
import TyCon ( TyCon, tyConName )
import DataCon ( dataConWorkId, dataConName )
import Var ( TyVar, Id, varName )
newGlobalBinder mod occ mb_parent loc
= do { mod `seq` occ `seq` return () -- See notes with lookupOrig_help
+ ; traceIf (text "newGlobalBinder" <+> ppr mod <+> ppr occ <+> ppr loc)
; name_supply <- getNameCache
; let (name_supply', name) = allocateGlobalBinder
name_supply mod occ
allocateGlobalBinder name_supply mod occ mb_parent loc
= case lookupOrigNameCache (nsNames name_supply) mod occ of
-- A hit in the cache! We are at the binding site of the name.
- -- This is the moment when we know the defining Module and SrcLoc
+ -- This is the moment when we know the defining parent and SrcLoc
-- of the Name, so we set these fields in the Name we return.
--
- -- This is essential, to get the right Module in a Name.
- -- Also: then (bogus) multiple bindings of the same Name
- -- get different SrcLocs can can be reported as such.
+ -- Then (bogus) multiple bindings of the same Name
+ -- get different SrcLocs can can be reported as such.
--
-- Possible other reason: it might be in the cache because we
-- encountered an occurrence before the binding site for an
Just parent_name -> parent_name
Nothing -> base_name
+lookupAvail :: Module -> GenAvailInfo OccName -> TcRnIf a b [Name]
+-- Find all the names arising from an import
+-- Make sure the parent info is correct, even though we may not
+-- yet have read the interface for this module
+lookupAvail mod (Avail n) = do { n' <- lookupOrig mod n;
+ ; return [n'] }
+lookupAvail mod (AvailTC p_occ occs)
+ = do { p_name <- lookupOrig mod p_occ
+ ; let lookup_sub occ | occ == p_occ = return p_name
+ | otherwise = lookup_orig mod occ (Just p_name)
+ ; mappM lookup_sub occs }
+ -- Remember that 'occs' is all the exported things, including
+ -- the parent. It's possible to export just class ops without
+ -- the class, via C( op ). If the class was exported too we'd
+ -- have C( C, op )
+
+ -- The use of lookupOrigSub here (rather than lookupOrig)
+ -- ensures that the subordinate names record their parent;
+ -- and that in turn ensures that the GlobalRdrEnv
+ -- has the correct parent for all the names in its range.
+ -- For imported things, we may only suck in the interface later, if ever.
+ -- Reason for all this:
+ -- Suppose module M exports type A.T, and constructor A.MkT
+ -- Then, we know that A.MkT is a subordinate name of A.T,
+ -- even though we aren't at the binding site of A.T
+ -- And it's important, because we may simply re-export A.T
+ -- without ever sucking in the declaration itself.
+
+
lookupOrig :: Module -> OccName -> TcRnIf a b Name
-- Even if we get a miss in the original-name cache, we
-- make a new External Name.
-- SrcLoc to noSrcLoc
-- Parent no Nothing
-- They'll be overwritten, in due course, by LoadIface.loadDecl.
+lookupOrig mod occ = lookup_orig mod occ Nothing
-lookupOrig mod occ
+lookup_orig :: Module -> OccName -> Maybe Name -> TcRnIf a b Name
+-- Used when we know the parent of the thing we are looking up
+lookup_orig mod occ mb_parent
= do { -- First ensure that mod and occ are evaluated
-- If not, chaos can ensue:
-- we read the name-cache
{ let { (us', us1) = splitUniqSupply (nsUniqs name_supply)
; uniq = uniqFromSupply us1
- ; name = mkExternalName uniq mod occ Nothing noSrcLoc
+ ; name = mkExternalName uniq mod occ mb_parent noSrcLoc
; new_cache = extend_name_cache (nsNames name_supply) mod occ name
; new_name_supply = name_supply {nsUniqs = us', nsNames = new_cache}
}
projects / ghc-hetmet.git / blobdiff