\begin{code}
module HscTypes (
+ GhciMode(..),
+
ModuleLocation(..),
ModDetails(..), ModIface(..),
- HomeSymbolTable, PackageTypeEnv,
+ HomeSymbolTable, emptySymbolTable,
+ PackageTypeEnv,
HomeIfaceTable, PackageIfaceTable, emptyIfaceTable,
- lookupTable, lookupTableByModName,
+ lookupIface, lookupIfaceByModName,
emptyModIface,
- IfaceDecls(..),
+ InteractiveContext(..),
+
+ IfaceDecls, mkIfaceDecls, dcl_tycl, dcl_rules, dcl_insts,
- VersionInfo(..), initialVersionInfo,
+ VersionInfo(..), initialVersionInfo, lookupVersion,
- TyThing(..), isTyClThing,
+ TyThing(..), isTyClThing, implicitTyThingIds,
- TypeEnv, lookupType, mkTypeEnv, extendTypeEnvList,
- typeEnvClasses, typeEnvTyCons,
+ TypeEnv, lookupType, mkTypeEnv, emptyTypeEnv,
+ extendTypeEnvList, extendTypeEnvWithIds,
+ typeEnvElts, typeEnvClasses, typeEnvTyCons, typeEnvIds,
- WhetherHasOrphans, ImportVersion, WhatsImported(..),
- PersistentRenamerState(..), IsBootInterface, Avails, DeclsMap,
- IfaceInsts, IfaceRules, GatedDecl,
- OrigNameEnv(..), OrigNameNameEnv, OrigNameIParamEnv,
- AvailEnv, AvailInfo, GenAvailInfo(..),
+ ImportedModuleInfo, WhetherHasOrphans, ImportVersion, WhatsImported(..),
+ PersistentRenamerState(..), IsBootInterface, DeclsMap,
+ IfaceInsts, IfaceRules, GatedDecl, GatedDecls, GateFn, IsExported,
+ NameSupply(..), OrigNameCache, OrigIParamCache,
+ Avails, AvailEnv, emptyAvailEnv,
+ GenAvailInfo(..), AvailInfo, RdrAvailInfo,
PersistentCompilerState(..),
Deprecations(..), lookupDeprec,
InstEnv, ClsInstEnv, DFunId,
PackageInstEnv, PackageRuleBase,
- GlobalRdrEnv, RdrAvailInfo,
+ GlobalRdrEnv, GlobalRdrElt(..), pprGlobalRdrEnv,
+ LocalRdrEnv, extendLocalRdrEnv,
+
-- Provenance
- Provenance(..), ImportReason(..), PrintUnqualified,
+ Provenance(..), ImportReason(..),
pprNameProvenance, hasBetterProv
) where
#include "HsVersions.h"
-import RdrName ( RdrNameEnv, emptyRdrEnv )
-import Name ( Name, NameEnv, NamedThing,
- emptyNameEnv, extendNameEnv,
- lookupNameEnv, emptyNameEnv, getName, nameModule,
- nameSrcLoc, nameEnvElts )
-import NameSet ( NameSet )
+import RdrName ( RdrName, RdrNameEnv, addListToRdrEnv, emptyRdrEnv,
+ mkRdrUnqual, rdrEnvToList )
+import Name ( Name, NamedThing, getName, nameOccName, nameModule, nameSrcLoc )
+import NameEnv
import OccName ( OccName )
import Module ( Module, ModuleName, ModuleEnv,
- lookupModuleEnv, lookupModuleEnvByName
+ lookupModuleEnv, lookupModuleEnvByName, emptyModuleEnv
)
+import InstEnv ( InstEnv, ClsInstEnv, DFunId )
import Rules ( RuleBase )
-import VarSet ( TyVarSet )
+import CoreSyn ( CoreBind )
import Id ( Id )
-import Class ( Class )
-import TyCon ( TyCon )
+import Class ( Class, classSelIds )
+import TyCon ( TyCon, isNewTyCon, tyConGenIds, tyConSelIds, tyConDataConsIfAvailable )
+import DataCon ( dataConId, dataConWrapId )
-import BasicTypes ( Version, initialVersion, Fixity )
+import BasicTypes ( Version, initialVersion, Fixity, IPName )
-import HsSyn ( DeprecTxt )
-import RdrHsSyn ( RdrNameHsDecl, RdrNameTyClDecl )
+import HsSyn ( DeprecTxt, tyClDeclName, ifaceRuleDeclName )
+import RdrHsSyn ( RdrNameInstDecl, RdrNameRuleDecl, RdrNameTyClDecl )
import RnHsSyn ( RenamedTyClDecl, RenamedRuleDecl, RenamedInstDecl )
import CoreSyn ( IdCoreRule )
-import Type ( Type )
import FiniteMap ( FiniteMap )
import Bag ( Bag )
-import Maybes ( seqMaybe )
-import UniqFM ( UniqFM, emptyUFM )
+import Maybes ( seqMaybe, orElse )
import Outputable
import SrcLoc ( SrcLoc, isGoodSrcLoc )
-import Util ( thenCmp )
+import Util ( thenCmp, sortLt )
import UniqSupply ( UniqSupply )
\end{code}
%************************************************************************
%* *
+\subsection{Which mode we're in
+%* *
+%************************************************************************
+
+\begin{code}
+data GhciMode = Batch | Interactive | OneShot
+ deriving Eq
+\end{code}
+
+
+%************************************************************************
+%* *
\subsection{Module locations}
%* *
%************************************************************************
\begin{code}
data ModuleLocation
= ModuleLocation {
- hs_preprocd_file :: FilePath, -- location after preprocessing
- hi_file :: FilePath,
- obj_file :: FilePath
+ ml_hs_file :: Maybe FilePath,
+ ml_hspp_file :: Maybe FilePath, -- path of preprocessed source
+ ml_hi_file :: FilePath,
+ ml_obj_file :: Maybe FilePath
}
deriving Show
A @ModIface@ plus a @ModDetails@ summarises everything we know
about a compiled module. The @ModIface@ is the stuff *before* linking,
-and can be written out to an interface file. The @ModDetails@ is after
-linking; it is the "linked" form of the mi_decls field.
+and can be written out to an interface file. (The @ModDetails@ is after
+linking; it is the "linked" form of the mi_decls field.)
+
+When we *read* an interface file, we also construct a @ModIface@ from it,
+except that the mi_decls part is empty; when reading we consolidate
+the declarations into a single indexed map in the @PersistentRenamerState@.
\begin{code}
data ModIface
= ModIface {
- mi_module :: Module, -- Complete with package info
- mi_version :: VersionInfo, -- Module version number
- mi_orphan :: WhetherHasOrphans, -- Whether this module has orphans
- mi_boot :: IsBootInterface, -- Whether this interface was read from an hi-boot file
+ mi_module :: !Module, -- Complete with package info
+ mi_version :: !VersionInfo, -- Module version number
- mi_usages :: [ImportVersion Name], -- Usages; kept sorted so that it's easy
- -- to decide whether to write a new iface file
- -- (changing usages doesn't affect the version of
- -- this module)
+ mi_orphan :: WhetherHasOrphans, -- Whether this module has orphans
+ -- NOT STRICT! we fill this field with _|_ sometimes
- mi_exports :: [(ModuleName,Avails)], -- What it exports
- -- Kept sorted by (mod,occ),
- -- to make version comparisons easier
+ mi_boot :: !IsBootInterface, -- read from an hi-boot file?
- mi_globals :: GlobalRdrEnv, -- Its top level environment
+ mi_usages :: ![ImportVersion Name],
+ -- Usages; kept sorted so that it's easy to decide
+ -- whether to write a new iface file (changing usages
+ -- doesn't affect the version of this module)
- mi_fixities :: NameEnv Fixity, -- Fixities
- mi_deprecs :: Deprecations, -- Deprecations
+ mi_exports :: ![(ModuleName,Avails)],
+ -- What it exports Kept sorted by (mod,occ), to make
+ -- version comparisons easier
- mi_decls :: IfaceDecls -- The RnDecls form of ModDetails
+ mi_globals :: !(Maybe GlobalRdrEnv),
+ -- Its top level environment or Nothing if we read this
+ -- interface from a file.
+
+ mi_fixities :: !(NameEnv Fixity), -- Fixities
+ mi_deprecs :: !Deprecations, -- Deprecations
+
+ mi_decls :: IfaceDecls -- The RnDecls form of ModDetails
+ -- NOT STRICT! we fill this field with _|_ sometimes
}
data IfaceDecls = IfaceDecls { dcl_tycl :: [RenamedTyClDecl], -- Sorted
dcl_rules :: [RenamedRuleDecl], -- Sorted
dcl_insts :: [RenamedInstDecl] } -- Unsorted
+mkIfaceDecls :: [RenamedTyClDecl] -> [RenamedRuleDecl] -> [RenamedInstDecl] -> IfaceDecls
+mkIfaceDecls tycls rules insts
+ = IfaceDecls { dcl_tycl = sortLt lt_tycl tycls,
+ dcl_rules = sortLt lt_rule rules,
+ dcl_insts = insts }
+ where
+ d1 `lt_tycl` d2 = tyClDeclName d1 < tyClDeclName d2
+ r1 `lt_rule` r2 = ifaceRuleDeclName r1 < ifaceRuleDeclName r2
+
+
-- typechecker should only look at this, not ModIface
-- Should be able to construct ModDetails from mi_decls in ModIface
data ModDetails
= ModDetails {
-- The next three fields are created by the typechecker
- md_types :: TypeEnv,
- md_insts :: [DFunId], -- Dfun-ids for the instances in this module
- md_rules :: [IdCoreRule] -- Domain may include Ids from other modules
+ md_types :: !TypeEnv,
+ md_insts :: ![DFunId], -- Dfun-ids for the instances in this module
+ md_rules :: ![IdCoreRule], -- Domain may include Ids from other modules
+ md_binds :: ![CoreBind]
}
+
+-- The ModDetails takes on several slightly different forms:
+--
+-- After typecheck + desugar
+-- md_types Contains TyCons, Classes, and implicit Ids
+-- md_insts All instances from this module (incl derived ones)
+-- md_rules All rules from this module
+-- md_binds Desugared bindings
+--
+-- After simplification
+-- md_types Same as after typecheck
+-- md_insts Ditto
+-- md_rules Orphan rules only (local ones now attached to binds)
+-- md_binds With rules attached
+--
+-- After CoreTidy
+-- md_types Now contains Ids as well, replete with final IdInfo
+-- The Ids are only the ones that are visible from
+-- importing modules. Without -O that means only
+-- exported Ids, but with -O importing modules may
+-- see ids mentioned in unfoldings of exported Ids
+--
+-- md_insts Same DFunIds as before, but with final IdInfo,
+-- and the unique might have changed; remember that
+-- CoreTidy links up the uniques of old and new versions
+--
+-- md_rules All rules for exported things, substituted with final Ids
+--
+-- md_binds Tidied
+--
+-- Passed back to compilation manager
+-- Just as after CoreTidy, but with md_binds nuked
+
\end{code}
\begin{code}
-emptyModDetails :: ModDetails
-emptyModDetails
- = ModDetails { md_types = emptyTypeEnv,
- md_insts = [],
- md_rules = []
- }
-
emptyModIface :: Module -> ModIface
emptyModIface mod
= ModIface { mi_module = mod,
mi_boot = False,
mi_exports = [],
mi_fixities = emptyNameEnv,
- mi_globals = emptyRdrEnv,
+ mi_globals = Nothing,
mi_deprecs = NoDeprecs,
mi_decls = panic "emptyModIface: decls"
}
type HomeSymbolTable = SymbolTable -- Domain = modules in the home package
+emptySymbolTable :: SymbolTable
+emptySymbolTable = emptyModuleEnv
+
emptyIfaceTable :: IfaceTable
-emptyIfaceTable = emptyUFM
+emptyIfaceTable = emptyModuleEnv
\end{code}
Simple lookups in the symbol table.
\begin{code}
-lookupTable :: ModuleEnv a -> ModuleEnv a -> Name -> Maybe a
--- We often have two Symbol- or IfaceTables, and want to do a lookup
-lookupTable ht pt name
- = lookupModuleEnv ht mod `seqMaybe` lookupModuleEnv pt mod
+lookupIface :: HomeIfaceTable -> PackageIfaceTable -> Name -> Maybe ModIface
+-- We often have two IfaceTables, and want to do a lookup
+lookupIface hit pit name
+ = lookupModuleEnv hit mod `seqMaybe` lookupModuleEnv pit mod
where
mod = nameModule name
-lookupTableByModName :: ModuleEnv a -> ModuleEnv a -> ModuleName -> Maybe a
--- We often have two Symbol- or IfaceTables, and want to do a lookup
-lookupTableByModName ht pt mod
- = lookupModuleEnvByName ht mod `seqMaybe` lookupModuleEnvByName pt mod
+lookupIfaceByModName :: HomeIfaceTable -> PackageIfaceTable -> ModuleName -> Maybe ModIface
+-- We often have two IfaceTables, and want to do a lookup
+lookupIfaceByModName hit pit mod
+ = lookupModuleEnvByName hit mod `seqMaybe` lookupModuleEnvByName pit mod
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{The interactive context}
+%* *
+%************************************************************************
+
+\begin{code}
+data InteractiveContext
+ = InteractiveContext {
+ ic_toplev_scope :: [Module], -- Include the "top-level" scope of
+ -- these modules
+
+ ic_exports :: [Module], -- Include just the exports of these
+ -- modules
+
+ ic_rn_gbl_env :: GlobalRdrEnv, -- The cached GlobalRdrEnv, built from
+ -- ic_toplev_scope and ic_exports
+
+ ic_print_unqual :: PrintUnqualified,
+ -- cached PrintUnqualified, as above
+
+ ic_rn_local_env :: LocalRdrEnv, -- Lexical context for variables bound
+ -- during interaction
+
+ ic_type_env :: TypeEnv -- Ditto for types
+ }
\end{code}
getName (ATyCon tc) = getName tc
getName (AClass cl) = getName cl
-typeEnvClasses env = [cl | AClass cl <- nameEnvElts env]
-typeEnvTyCons env = [tc | ATyCon tc <- nameEnvElts env]
+instance Outputable TyThing where
+ ppr (AnId id) = ptext SLIT("AnId") <+> ppr id
+ ppr (ATyCon tc) = ptext SLIT("ATyCon") <+> ppr tc
+ ppr (AClass cl) = ptext SLIT("AClass") <+> ppr cl
+
+typeEnvElts :: TypeEnv -> [TyThing]
+typeEnvClasses :: TypeEnv -> [Class]
+typeEnvTyCons :: TypeEnv -> [TyCon]
+typeEnvIds :: TypeEnv -> [Id]
+
+typeEnvElts env = nameEnvElts env
+typeEnvClasses env = [cl | AClass cl <- typeEnvElts env]
+typeEnvTyCons env = [tc | ATyCon tc <- typeEnvElts env]
+typeEnvIds env = [id | AnId id <- typeEnvElts env]
+
+implicitTyThingIds :: [TyThing] -> [Id]
+-- Add the implicit data cons and selectors etc
+implicitTyThingIds things
+ = concat (map go things)
+ where
+ go (AnId f) = []
+ go (AClass cl) = classSelIds cl
+ go (ATyCon tc) = tyConGenIds tc ++
+ tyConSelIds tc ++
+ [ n | dc <- tyConDataConsIfAvailable tc,
+ n <- implicitConIds tc dc]
+ -- Synonyms return empty list of constructors and selectors
+
+ implicitConIds tc dc -- Newtypes have a constructor wrapper,
+ -- but no worker
+ | isNewTyCon tc = [dataConWrapId dc]
+ | otherwise = [dataConId dc, dataConWrapId dc]
\end{code}
extendTypeEnvList :: TypeEnv -> [TyThing] -> TypeEnv
extendTypeEnvList env things
- = foldl add_thing env things
- where
- add_thing :: TypeEnv -> TyThing -> TypeEnv
- add_thing env thing = extendNameEnv env (getName thing) thing
+ = extendNameEnvList env [(getName thing, thing) | thing <- things]
+
+extendTypeEnvWithIds :: TypeEnv -> [Id] -> TypeEnv
+extendTypeEnvWithIds env ids
+ = extendNameEnvList env [(getName id, AnId id) | id <- ids]
\end{code}
\begin{code}
-- The version of an Id changes if its fixity changes
-- Ditto data constructors, class operations, except that the version of
-- the parent class/tycon changes
+ --
+ -- If a name isn't in the map, it means 'initialVersion'
}
initialVersionInfo :: VersionInfo
initialVersionInfo = VersionInfo { vers_module = initialVersion,
vers_exports = initialVersion,
vers_rules = initialVersion,
- vers_decls = emptyNameEnv }
+ vers_decls = emptyNameEnv
+ }
+
+lookupVersion :: NameEnv Version -> Name -> Version
+lookupVersion env name = lookupNameEnv env name `orElse` initialVersion
data Deprecations = NoDeprecs
| DeprecAll DeprecTxt -- Whole module deprecated
Just (_, txt) -> Just txt
Nothing -> Nothing
-type InstEnv = UniqFM ClsInstEnv -- Maps Class to instances for that class
-
-type ClsInstEnv = [(TyVarSet, [Type], DFunId)] -- The instances for a particular class
-type DFunId = Id
+instance Eq Deprecations where
+ -- Used when checking whether we need write a new interface
+ NoDeprecs == NoDeprecs = True
+ (DeprecAll t1) == (DeprecAll t2) = t1 == t2
+ (DeprecSome e1) == (DeprecSome e2) = nameEnvElts e1 == nameEnvElts e2
+ d1 == d2 = False
\end{code}
deriving( Eq )
-- Equality used when deciding if the interface has changed
-type AvailEnv = NameEnv AvailInfo -- Maps a Name to the AvailInfo that contains it
+type AvailEnv = NameEnv AvailInfo -- Maps a Name to the AvailInfo that contains it
+
+emptyAvailEnv :: AvailEnv
+emptyAvailEnv = emptyNameEnv
+
+instance Outputable n => Outputable (GenAvailInfo n) where
+ ppr = pprAvail
+
+pprAvail :: Outputable n => GenAvailInfo n -> SDoc
+pprAvail (AvailTC n ns) = ppr n <> case {- filter (/= n) -} ns of
+ [] -> empty
+ ns' -> braces (hsep (punctuate comma (map ppr ns')))
+
+pprAvail (Avail n) = ppr n
\end{code}
-- we imported the module without saying exactly what we imported
-- We need to recompile if the module exports changes, because we might
-- now have a name clash in the importing module.
+
+type IsExported = Name -> Bool -- True for names that are exported from this module
\end{code}
%* *
%************************************************************************
+The @PersistentCompilerState@ persists across successive calls to the
+compiler.
+
+ * A ModIface for each non-home-package module
+
+ * An accumulated TypeEnv from all the modules in imported packages
+
+ * An accumulated InstEnv from all the modules in imported packages
+ The point is that we don't want to keep recreating it whenever
+ we compile a new module. The InstEnv component of pcPST is empty.
+ (This means we might "see" instances that we shouldn't "really" see;
+ but the Haskell Report is vague on what is meant to be visible,
+ so we just take the easy road here.)
+
+ * Ditto for rules
+
+ * The persistent renamer state
+
\begin{code}
data PersistentCompilerState
= PCS {
- pcs_PIT :: PackageIfaceTable, -- Domain = non-home-package modules
+ pcs_PIT :: !PackageIfaceTable, -- Domain = non-home-package modules
-- the mi_decls component is empty
- pcs_PTE :: PackageTypeEnv, -- Domain = non-home-package modules
+ pcs_PTE :: !PackageTypeEnv, -- Domain = non-home-package modules
-- except that the InstEnv components is empty
- pcs_insts :: PackageInstEnv, -- The total InstEnv accumulated from all
+ pcs_insts :: !PackageInstEnv, -- The total InstEnv accumulated from all
-- the non-home-package modules
- pcs_rules :: PackageRuleBase, -- Ditto RuleEnv
+ pcs_rules :: !PackageRuleBase, -- Ditto RuleEnv
- pcs_PRS :: PersistentRenamerState
+ pcs_PRS :: !PersistentRenamerState
}
-
\end{code}
-The @PersistentRenamerState@ persists across successive calls to the
-compiler.
-It contains:
+The persistent renamer state contains:
+
* A name supply, which deals with allocating unique names to
(Module,OccName) original names,
- * An accumulated TypeEnv from all the modules in imported packages
-
- * An accumulated InstEnv from all the modules in imported packages
- The point is that we don't want to keep recreating it whenever
- we compile a new module. The InstEnv component of pcPST is empty.
- (This means we might "see" instances that we shouldn't "really" see;
- but the Haskell Report is vague on what is meant to be visible,
- so we just take the easy road here.)
-
- * Ditto for rules
-
* A "holding pen" for declarations that have been read out of
interface files but not yet sucked in, renamed, and typechecked
type PackageInstEnv = InstEnv
data PersistentRenamerState
- = PRS { prsOrig :: OrigNameEnv,
- prsDecls :: DeclsMap,
- prsInsts :: IfaceInsts,
- prsRules :: IfaceRules,
- prsNS :: UniqSupply
+ = PRS { prsOrig :: !NameSupply,
+ prsImpMods :: !ImportedModuleInfo,
+
+ -- Holding pens for stuff that has been read in
+ -- but not yet slurped into the renamer
+ prsDecls :: !DeclsMap,
+ prsInsts :: !IfaceInsts,
+ prsRules :: !IfaceRules
}
\end{code}
-The OrigNameEnv makes sure that there is just one Unique assigned for
+The NameSupply makes sure that there is just one Unique assigned for
each original name; i.e. (module-name, occ-name) pair. The Name is
always stored as a Global, and has the SrcLoc of its binding location.
Actually that's not quite right. When we first encounter the original
we just store junk. Then when we find the binding site, we fix it up.
\begin{code}
-data OrigNameEnv
- = Orig { origNames :: OrigNameNameEnv,
+data NameSupply
+ = NameSupply { nsUniqs :: UniqSupply,
+ -- Supply of uniques
+ nsNames :: OrigNameCache,
-- Ensures that one original name gets one unique
- origIParam :: OrigNameIParamEnv
+ nsIPs :: OrigIParamCache
-- Ensures that one implicit parameter name gets one unique
}
-type OrigNameNameEnv = FiniteMap (ModuleName,OccName) Name
-type OrigNameIParamEnv = FiniteMap OccName Name
+type OrigNameCache = FiniteMap (ModuleName,OccName) Name
+type OrigIParamCache = FiniteMap (IPName RdrName) (IPName Name)
\end{code}
+@ImportedModuleInfo@ contains info ONLY about modules that have not yet
+been loaded into the iPIT. These modules are mentioned in interfaces we've
+already read, so we know a tiny bit about them, but we havn't yet looked
+at the interface file for the module itself. It needs to persist across
+invocations of the renamer, at least from Rename.checkOldIface to Rename.renameSource.
+And there's no harm in it persisting across multiple compilations.
+
+\begin{code}
+type ImportedModuleInfo = FiniteMap ModuleName (WhetherHasOrphans, IsBootInterface)
+\end{code}
A DeclsMap contains a binding for each Name in the declaration
including the constructors of a type decl etc. The Bool is True just
for the 'main' Name.
\begin{code}
-type DeclsMap = NameEnv (AvailInfo, Bool, (Module, RdrNameTyClDecl))
-
-type IfaceInsts = Bag GatedDecl
-type IfaceRules = Bag GatedDecl
-
-type GatedDecl = (NameSet, (Module, RdrNameHsDecl))
+type DeclsMap = (NameEnv (AvailInfo, Bool, (Module, RdrNameTyClDecl)), Int)
+ -- The Int says how many have been sucked in
+
+type IfaceInsts = GatedDecls RdrNameInstDecl
+type IfaceRules = GatedDecls RdrNameRuleDecl
+
+type GatedDecls d = (Bag (GatedDecl d), Int) -- The Int says how many have been sucked in
+type GatedDecl d = (GateFn, (Module, d))
+type GateFn = (Name -> Bool) -> Bool -- Returns True <=> gate is open
+ -- The (Name -> Bool) fn returns True for visible Names
+ -- For example, suppose this is in an interface file
+ -- instance C T where ...
+ -- We want to slurp this decl if both C and T are "visible" in
+ -- the importing module. See "The gating story" in RnIfaces for details.
\end{code}
%* *
%************************************************************************
+A LocalRdrEnv is used for local bindings (let, where, lambda, case)
+
+\begin{code}
+type LocalRdrEnv = RdrNameEnv Name
+
+extendLocalRdrEnv :: LocalRdrEnv -> [Name] -> LocalRdrEnv
+extendLocalRdrEnv env names
+ = addListToRdrEnv env [(mkRdrUnqual (nameOccName n), n) | n <- names]
+\end{code}
+
The GlobalRdrEnv gives maps RdrNames to Names. There is a separate
one for each module, corresponding to that module's top-level scope.
\begin{code}
-type GlobalRdrEnv = RdrNameEnv [(Name,Provenance)] -- The list is because there may be name clashes
- -- These only get reported on lookup,
- -- not on construction
+type GlobalRdrEnv = RdrNameEnv [GlobalRdrElt]
+ -- The list is because there may be name clashes
+ -- These only get reported on lookup, not on construction
+
+data GlobalRdrElt = GRE Name Provenance (Maybe DeprecTxt)
+ -- The Maybe DeprecTxt tells whether this name is deprecated
+
+pprGlobalRdrEnv env
+ = vcat (map pp (rdrEnvToList env))
+ where
+ pp (rn, nps) = ppr rn <> colon <+>
+ vcat [ppr n <+> pprNameProvenance n p | (GRE n p _) <- nps]
\end{code}
The "provenance" of something says how it came to be in scope.
| NonLocalDef -- Defined non-locally
ImportReason
- PrintUnqualified
-- Just used for grouping error messages (in RnEnv.warnUnusedBinds)
instance Eq Provenance where
instance Ord Provenance where
compare LocalDef LocalDef = EQ
- compare LocalDef (NonLocalDef _ _) = LT
- compare (NonLocalDef _ _) LocalDef = GT
+ compare LocalDef (NonLocalDef _) = LT
+ compare (NonLocalDef _) LocalDef = GT
- compare (NonLocalDef reason1 _) (NonLocalDef reason2 _)
+ compare (NonLocalDef reason1) (NonLocalDef reason2)
= compare reason1 reason2
instance Ord ImportReason where
-- This info is used when warning of unused names.
| ImplicitImport -- Imported implicitly for some other reason
-
-
-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}
-- a local thing over an imported thing
-- a user-imported thing over a non-user-imported thing
-- an explicitly-imported thing over an implicitly imported thing
-hasBetterProv LocalDef _ = True
-hasBetterProv (NonLocalDef (UserImport _ _ True) _) _ = True
-hasBetterProv (NonLocalDef (UserImport _ _ _ ) _) (NonLocalDef ImplicitImport _) = True
-hasBetterProv _ _ = False
+hasBetterProv LocalDef _ = True
+hasBetterProv (NonLocalDef (UserImport _ _ _ )) (NonLocalDef ImplicitImport) = True
+hasBetterProv _ _ = False
pprNameProvenance :: Name -> Provenance -> SDoc
-pprNameProvenance name LocalDef = ptext SLIT("defined at") <+> ppr (nameSrcLoc name)
-pprNameProvenance name (NonLocalDef why _) = sep [ppr_reason why,
- nest 2 (parens (ppr_defn (nameSrcLoc name)))]
+pprNameProvenance name LocalDef = ptext SLIT("defined at") <+> ppr (nameSrcLoc name)
+pprNameProvenance name (NonLocalDef why) = sep [ppr_reason why,
+ nest 2 (ppr_defn (nameSrcLoc name))]
ppr_reason ImplicitImport = ptext SLIT("implicitly imported")
ppr_reason (UserImport mod loc _) = ptext SLIT("imported from") <+> ppr mod <+> ptext SLIT("at") <+> ppr loc
-ppr_defn loc | isGoodSrcLoc loc = ptext SLIT("at") <+> ppr loc
+ppr_defn loc | isGoodSrcLoc loc = parens (ptext SLIT("at") <+> ppr loc)
| otherwise = empty
\end{code}