diff options
Diffstat (limited to 'compiler/GHC/Types/Name/Reader.hs')
| -rw-r--r-- | compiler/GHC/Types/Name/Reader.hs | 39 |
1 files changed, 31 insertions, 8 deletions
diff --git a/compiler/GHC/Types/Name/Reader.hs b/compiler/GHC/Types/Name/Reader.hs index c40a7143ff..6eb81653a5 100644 --- a/compiler/GHC/Types/Name/Reader.hs +++ b/compiler/GHC/Types/Name/Reader.hs @@ -46,7 +46,7 @@ module GHC.Types.Name.Reader ( GlobalRdrEnv, emptyGlobalRdrEnv, mkGlobalRdrEnv, plusGlobalRdrEnv, lookupGlobalRdrEnv, extendGlobalRdrEnv, greOccName, shadowNames, pprGlobalRdrEnv, globalRdrEnvElts, - lookupGRE_RdrName, lookupGRE_Name, + lookupGRE_RdrName, lookupGRE_RdrName', lookupGRE_Name, lookupGRE_GreName, lookupGRE_FieldLabel, lookupGRE_Name_OccName, getGRE_NameQualifier_maybes, @@ -58,9 +58,11 @@ module GHC.Types.Name.Reader ( gresToAvailInfo, greDefinitionModule, greDefinitionSrcSpan, greMangledName, grePrintableName, + greFieldLabel, -- ** Global 'RdrName' mapping elements: 'GlobalRdrElt', 'Provenance', 'ImportSpec' - GlobalRdrElt(..), isLocalGRE, isRecFldGRE, isOverloadedRecFldGRE, greFieldLabel, + GlobalRdrElt(..), isLocalGRE, isRecFldGRE, + isDuplicateRecFldGRE, isNoFieldSelectorGRE, isFieldSelectorGRE, unQualOK, qualSpecOK, unQualSpecOK, pprNameProvenance, GreName(..), greNameSrcSpan, @@ -836,7 +838,15 @@ lookupGlobalRdrEnv env occ_name = case lookupOccEnv env occ_name of Just gres -> gres lookupGRE_RdrName :: RdrName -> GlobalRdrEnv -> [GlobalRdrElt] -lookupGRE_RdrName rdr_name env +-- ^ Look for this 'RdrName' in the global environment. Omits record fields +-- without selector functions (see Note [NoFieldSelectors] in GHC.Rename.Env). +lookupGRE_RdrName rdr_name env = + filter (not . isNoFieldSelectorGRE) (lookupGRE_RdrName' rdr_name env) + +lookupGRE_RdrName' :: RdrName -> GlobalRdrEnv -> [GlobalRdrElt] +-- ^ Look for this 'RdrName' in the global environment. Includes record fields +-- without selector functions (see Note [NoFieldSelectors] in GHC.Rename.Env). +lookupGRE_RdrName' rdr_name env = case lookupOccEnv env (rdrNameOcc rdr_name) of Nothing -> [] Just gres -> pickGREs rdr_name gres @@ -858,14 +868,14 @@ lookupGRE_GreName env gname lookupGRE_FieldLabel :: GlobalRdrEnv -> FieldLabel -> Maybe GlobalRdrElt -- ^ Look for a particular record field selector in the environment, where the -- selector name and field label may be different: the GlobalRdrEnv is keyed on --- the label. See Note [Parents for record fields] for why this happens. +-- the label. See Note [GreNames] for why this happens. lookupGRE_FieldLabel env fl = lookupGRE_Name_OccName env (flSelector fl) (mkVarOccFS (flLabel fl)) lookupGRE_Name_OccName :: GlobalRdrEnv -> Name -> OccName -> Maybe GlobalRdrElt -- ^ Look for precisely this 'Name' in the environment, but with an 'OccName' -- that might differ from that of the 'Name'. See 'lookupGRE_FieldLabel' and --- Note [Parents for record fields]. +-- Note [GreNames]. lookupGRE_Name_OccName env name occ = case [ gre | gre <- lookupGlobalRdrEnv env occ , greMangledName gre == name ] of @@ -895,10 +905,23 @@ isLocalGRE (GRE {gre_lcl = lcl }) = lcl isRecFldGRE :: GlobalRdrElt -> Bool isRecFldGRE = isJust . greFieldLabel -isOverloadedRecFldGRE :: GlobalRdrElt -> Bool +isDuplicateRecFldGRE :: GlobalRdrElt -> Bool -- ^ Is this a record field defined with DuplicateRecordFields? --- (See Note [Parents for record fields]) -isOverloadedRecFldGRE = maybe False flIsOverloaded . greFieldLabel +-- (See Note [GreNames]) +isDuplicateRecFldGRE = + maybe False ((DuplicateRecordFields ==) . flHasDuplicateRecordFields) . greFieldLabel + +isNoFieldSelectorGRE :: GlobalRdrElt -> Bool +-- ^ Is this a record field defined with NoFieldSelectors? +-- (See Note [NoFieldSelectors] in GHC.Rename.Env) +isNoFieldSelectorGRE = + maybe False ((NoFieldSelectors ==) . flHasFieldSelector) . greFieldLabel + +isFieldSelectorGRE :: GlobalRdrElt -> Bool +-- ^ Is this a record field defined with FieldSelectors? +-- (See Note [NoFieldSelectors] in GHC.Rename.Env) +isFieldSelectorGRE = + maybe False ((FieldSelectors ==) . flHasFieldSelector) . greFieldLabel greFieldLabel :: GlobalRdrElt -> Maybe FieldLabel -- ^ Returns the field label of this GRE, if it has one |