2 % (c) The University of Glasgow, 2000
4 \section[HscTypes]{Types for the per-module compiler}
11 ModDetails(..), ModIface(..),
12 ModGuts(..), ModImports(..), ForeignStubs(..),
13 ParsedIface(..), IfaceDeprecs,
15 HomePackageTable, HomeModInfo(..), emptyHomePackageTable,
17 ExternalPackageState(..),
18 PackageTypeEnv, PackageIfaceTable, emptyPackageIfaceTable,
19 lookupIface, lookupIfaceByModName, moduleNameToModule,
22 InteractiveContext(..), emptyInteractiveContext, icPrintUnqual,
24 IfaceDecls, mkIfaceDecls, dcl_tycl, dcl_rules, dcl_insts,
26 VersionInfo(..), initialVersionInfo, lookupVersion,
27 FixityEnv, lookupFixity, collectFixities, emptyFixityEnv,
29 TyThing(..), isTyClThing, implicitTyThingIds,
31 TypeEnv, lookupType, mkTypeEnv, emptyTypeEnv,
32 extendTypeEnvList, extendTypeEnvWithIds,
33 typeEnvElts, typeEnvClasses, typeEnvTyCons, typeEnvIds,
35 ImportedModuleInfo, WhetherHasOrphans, ImportVersion, WhatsImported(..),
36 IsBootInterface, DeclsMap,
37 IfaceInsts, IfaceRules, GatedDecl, GatedDecls, GateFn,
38 NameCache(..), OrigNameCache, OrigIParamCache,
39 Avails, availsToNameSet, availName, availNames,
40 GenAvailInfo(..), AvailInfo, RdrAvailInfo,
41 ExportItem, RdrExportItem,
43 PersistentCompilerState(..),
45 Deprecations(..), lookupDeprec, plusDeprecs,
47 InstEnv, ClsInstEnv, DFunId,
48 PackageInstEnv, PackageRuleBase,
50 GlobalRdrEnv, GlobalRdrElt(..), emptyGlobalRdrEnv, pprGlobalRdrEnv,
51 LocalRdrEnv, extendLocalRdrEnv, isLocalGRE, unQualInScope,
54 Linkable(..), isObjectLinkable,
55 Unlinked(..), CompiledByteCode,
56 isObject, nameOfObject, isInterpretable, byteCodeOfObject,
59 Provenance(..), ImportReason(..),
60 pprNameProvenance, hasBetterProv
64 #include "HsVersions.h"
67 import ByteCodeAsm ( CompiledByteCode )
70 import RdrName ( RdrName, mkRdrUnqual,
71 RdrNameEnv, addListToRdrEnv, foldRdrEnv, isUnqual,
72 rdrEnvToList, emptyRdrEnv )
73 import Name ( Name, NamedThing, getName, nameOccName, nameModule, nameSrcLoc )
76 import OccName ( OccName )
78 import InstEnv ( InstEnv, ClsInstEnv, DFunId )
79 import Rules ( RuleBase )
80 import CoreSyn ( CoreBind )
82 import Class ( Class, classSelIds )
83 import TyCon ( TyCon, isNewTyCon, tyConGenIds, tyConSelIds, tyConDataCons_maybe )
84 import Type ( TyThing(..), isTyClThing )
85 import DataCon ( dataConWorkId, dataConWrapId )
86 import Packages ( PackageName, preludePackage )
87 import CmdLineOpts ( DynFlags )
89 import BasicTypes ( Version, initialVersion, IPName,
90 Fixity, FixitySig(..), defaultFixity )
92 import HsSyn ( DeprecTxt, TyClDecl, InstDecl, RuleDecl,
93 tyClDeclName, ifaceRuleDeclName, tyClDeclNames )
94 import RnHsSyn ( RenamedTyClDecl, RenamedRuleDecl, RenamedInstDecl )
96 import CoreSyn ( IdCoreRule )
97 import PrelNames ( isBuiltInSyntaxName )
101 import Maybes ( orElse )
103 import SrcLoc ( SrcLoc, isGoodSrcLoc )
104 import Util ( thenCmp, sortLt )
105 import UniqSupply ( UniqSupply )
106 import Maybe ( fromJust )
107 import FastString ( FastString )
109 import Time ( ClockTime )
113 %************************************************************************
115 \subsection{Compilation environment}
117 %************************************************************************
119 The HscEnv gives the environment in which to compile a chunk of code.
122 data HscEnv = HscEnv { hsc_mode :: GhciMode,
123 hsc_dflags :: DynFlags,
124 hsc_HPT :: HomePackageTable }
127 The GhciMode is self-explanatory:
130 data GhciMode = Batch | Interactive | OneShot
135 type HomePackageTable = ModuleEnv HomeModInfo -- Domain = modules in the home package
136 type PackageIfaceTable = ModuleEnv ModIface -- Domain = modules in the imported packages
138 emptyHomePackageTable = emptyModuleEnv
139 emptyPackageIfaceTable = emptyModuleEnv
141 data HomeModInfo = HomeModInfo { hm_iface :: ModIface,
142 hm_details :: ModDetails,
143 hm_linkable :: Linkable }
146 Simple lookups in the symbol table.
149 lookupIface :: HomePackageTable -> PackageIfaceTable -> Name -> Maybe ModIface
150 -- We often have two IfaceTables, and want to do a lookup
151 lookupIface hpt pit name
152 = case lookupModuleEnv hpt mod of
153 Just mod_info -> Just (hm_iface mod_info)
154 Nothing -> lookupModuleEnv pit mod
156 mod = nameModule name
158 lookupIfaceByModName :: HomePackageTable -> PackageIfaceTable -> ModuleName -> Maybe ModIface
159 -- We often have two IfaceTables, and want to do a lookup
160 lookupIfaceByModName hpt pit mod
161 = case lookupModuleEnvByName hpt mod of
162 Just mod_info -> Just (hm_iface mod_info)
163 Nothing -> lookupModuleEnvByName pit mod
167 -- Use instead of Finder.findModule if possible: this way doesn't
168 -- require filesystem operations, and it is guaranteed not to fail
169 -- when the IfaceTables are properly populated (i.e. after the renamer).
170 moduleNameToModule :: HomePackageTable -> PackageIfaceTable -> ModuleName -> Module
171 moduleNameToModule hpt pit mod
172 = mi_module (fromJust (lookupIfaceByModName hpt pit mod))
176 %************************************************************************
178 \subsection{Symbol tables and Module details}
180 %************************************************************************
182 A @ModIface@ plus a @ModDetails@ summarises everything we know
183 about a compiled module. The @ModIface@ is the stuff *before* linking,
184 and can be written out to an interface file. (The @ModDetails@ is after
185 linking; it is the "linked" form of the mi_decls field.)
187 When we *read* an interface file, we also construct a @ModIface@ from it,
188 except that the mi_decls part is empty; when reading we consolidate
189 the declarations into a single indexed map in the @PersistentRenamerState@.
194 mi_module :: !Module,
195 mi_package :: !PackageName, -- Which package the module comes from
196 mi_version :: !VersionInfo, -- Module version number
197 mi_orphan :: !WhetherHasOrphans, -- Whether this module has orphans
198 mi_boot :: !IsBootInterface, -- Read from an hi-boot file?
200 mi_usages :: [ImportVersion Name],
201 -- Usages; kept sorted so that it's easy to decide
202 -- whether to write a new iface file (changing usages
203 -- doesn't affect the version of this module)
204 -- NOT STRICT! we read this field lazily from the interface file
206 mi_exports :: ![ExportItem],
207 -- What it exports Kept sorted by (mod,occ), to make
208 -- version comparisons easier
210 mi_globals :: !(Maybe GlobalRdrEnv),
211 -- Its top level environment or Nothing if we read this
212 -- interface from an interface file. (We need the source
213 -- file to figure out the top-level environment.)
215 mi_fixities :: !FixityEnv, -- Fixities
216 mi_deprecs :: Deprecations, -- Deprecations
217 -- NOT STRICT! we read this field lazilly from the interface file
219 mi_decls :: IfaceDecls -- The RnDecls form of ModDetails
220 -- NOT STRICT! we fill this field with _|_ sometimes
223 -- Should be able to construct ModDetails from mi_decls in ModIface
226 -- The next three fields are created by the typechecker
227 md_types :: !TypeEnv,
228 md_insts :: ![DFunId], -- Dfun-ids for the instances in this module
229 md_rules :: ![IdCoreRule] -- Domain may include Ids from other modules
234 -- A ModGuts is carried through the compiler, accumulating stuff as it goes
235 -- There is only one ModGuts at any time, the one for the module
236 -- being compiled right now. Once it is compiled, a ModIface and
237 -- ModDetails are extracted and the ModGuts is dicarded.
241 mg_module :: !Module,
242 mg_exports :: !Avails, -- What it exports
243 mg_usages :: ![ImportVersion Name], -- What it imports, directly or otherwise
244 -- ...exactly as in ModIface
245 mg_dir_imps :: ![Module], -- Directly imported modules
247 mg_rdr_env :: !GlobalRdrEnv, -- Top-level lexical environment
248 mg_fix_env :: !FixityEnv, -- Fixity env, for things declared in this module
249 mg_deprecs :: !Deprecations, -- Deprecations declared in the module
251 mg_types :: !TypeEnv,
252 mg_insts :: ![DFunId], -- Instances
253 mg_rules :: ![IdCoreRule], -- Rules from this module
254 mg_binds :: ![CoreBind], -- Bindings for this module
255 mg_foreign :: !ForeignStubs
258 -- The ModGuts takes on several slightly different forms:
260 -- After simplification, the following fields change slightly:
261 -- mg_rules Orphan rules only (local ones now attached to binds)
262 -- mg_binds With rules attached
264 -- After CoreTidy, the following fields change slightly:
265 -- mg_types Now contains Ids as well, replete with final IdInfo
266 -- The Ids are only the ones that are visible from
267 -- importing modules. Without -O that means only
268 -- exported Ids, but with -O importing modules may
269 -- see ids mentioned in unfoldings of exported Ids
271 -- mg_insts Same DFunIds as before, but with final IdInfo,
272 -- and the unique might have changed; remember that
273 -- CoreTidy links up the uniques of old and new versions
275 -- mg_rules All rules for exported things, substituted with final Ids
283 imp_direct :: ![(Module,Bool)], -- Explicitly-imported modules
284 -- Boolean is true if we imported the whole
285 -- module (apart, perhaps, from hiding some)
286 imp_pkg_mods :: !ModuleSet, -- Non-home-package modules on which we depend,
287 -- directly or indirectly
288 imp_home_names :: !NameSet -- Home package things on which we depend,
289 -- directly or indirectly
292 data ForeignStubs = NoStubs
294 SDoc -- Header file prototypes for
295 -- "foreign exported" functions
296 SDoc -- C stubs to use when calling
297 -- "foreign exported" functions
298 [FastString] -- Headers that need to be included
299 -- into C code generated for this module
300 [Id] -- Foreign-exported binders
301 -- we have to generate code to register these
304 data IfaceDecls = IfaceDecls { dcl_tycl :: [RenamedTyClDecl], -- Sorted
305 dcl_rules :: [RenamedRuleDecl], -- Sorted
306 dcl_insts :: [RenamedInstDecl] } -- Unsorted
308 mkIfaceDecls :: [RenamedTyClDecl] -> [RenamedRuleDecl] -> [RenamedInstDecl] -> IfaceDecls
309 mkIfaceDecls tycls rules insts
310 = IfaceDecls { dcl_tycl = sortLt lt_tycl tycls,
311 dcl_rules = sortLt lt_rule rules,
314 d1 `lt_tycl` d2 = tyClDeclName d1 < tyClDeclName d2
315 r1 `lt_rule` r2 = ifaceRuleDeclName r1 < ifaceRuleDeclName r2
319 emptyModIface :: Module -> ModIface
321 = ModIface { mi_module = mod,
322 mi_package = preludePackage, -- XXX fully bogus
323 mi_version = initialVersionInfo,
328 mi_fixities = emptyNameEnv,
329 mi_globals = Nothing,
330 mi_deprecs = NoDeprecs,
331 mi_decls = panic "emptyModIface: decls"
336 %************************************************************************
338 Parsed interface files
340 %************************************************************************
342 A ParsedIface is exactly as read from an interface file.
345 type IfaceDeprecs = Maybe (Either DeprecTxt [(RdrName,DeprecTxt)])
346 -- Nothing => NoDeprecs
347 -- Just (Left t) => DeprecAll
348 -- Just (Right p) => DeprecSome
352 pi_mod :: ModuleName,
353 pi_pkg :: PackageName,
354 pi_vers :: Version, -- Module version number
355 pi_orphan :: WhetherHasOrphans, -- Whether this module has orphans
356 pi_usages :: [ImportVersion OccName], -- Usages
357 pi_exports :: (Version, [RdrExportItem]), -- Exports
358 pi_decls :: [(Version, TyClDecl RdrName)], -- Local definitions
359 pi_fixity :: [FixitySig RdrName], -- Local fixity declarations,
360 pi_insts :: [InstDecl RdrName], -- Local instance declarations
361 pi_rules :: (Version, [RuleDecl RdrName]), -- Rules, with their version
362 pi_deprecs :: IfaceDeprecs -- Deprecations
367 %************************************************************************
369 \subsection{The interactive context}
371 %************************************************************************
374 data InteractiveContext
375 = InteractiveContext {
376 ic_toplev_scope :: [Module], -- Include the "top-level" scope of
379 ic_exports :: [Module], -- Include just the exports of these
382 ic_rn_gbl_env :: GlobalRdrEnv, -- The cached GlobalRdrEnv, built from
383 -- ic_toplev_scope and ic_exports
385 ic_rn_local_env :: LocalRdrEnv, -- Lexical context for variables bound
386 -- during interaction
388 ic_type_env :: TypeEnv -- Ditto for types
391 emptyInteractiveContext
392 = InteractiveContext { ic_toplev_scope = [],
394 ic_rn_gbl_env = emptyRdrEnv,
395 ic_rn_local_env = emptyRdrEnv,
396 ic_type_env = emptyTypeEnv }
398 icPrintUnqual :: InteractiveContext -> PrintUnqualified
399 icPrintUnqual ictxt = unQualInScope (ic_rn_gbl_env ictxt)
403 %************************************************************************
405 \subsection{Type environment stuff}
407 %************************************************************************
410 typeEnvElts :: TypeEnv -> [TyThing]
411 typeEnvClasses :: TypeEnv -> [Class]
412 typeEnvTyCons :: TypeEnv -> [TyCon]
413 typeEnvIds :: TypeEnv -> [Id]
415 typeEnvElts env = nameEnvElts env
416 typeEnvClasses env = [cl | AClass cl <- typeEnvElts env]
417 typeEnvTyCons env = [tc | ATyCon tc <- typeEnvElts env]
418 typeEnvIds env = [id | AnId id <- typeEnvElts env]
420 implicitTyThingIds :: [TyThing] -> [Id]
421 -- Add the implicit data cons and selectors etc
422 implicitTyThingIds things
423 = concat (map go things)
426 go (AClass cl) = classSelIds cl
427 go (ATyCon tc) = tyConGenIds tc ++
429 [ n | dc <- tyConDataCons_maybe tc `orElse` [],
430 n <- implicitConIds tc dc]
431 -- Synonyms return empty list of constructors and selectors
433 implicitConIds tc dc -- Newtypes have a constructor wrapper,
435 | isNewTyCon tc = [dataConWrapId dc]
436 | otherwise = [dataConWorkId dc, dataConWrapId dc]
441 type TypeEnv = NameEnv TyThing
443 emptyTypeEnv = emptyNameEnv
445 mkTypeEnv :: [TyThing] -> TypeEnv
446 mkTypeEnv things = extendTypeEnvList emptyTypeEnv things
448 extendTypeEnvList :: TypeEnv -> [TyThing] -> TypeEnv
449 extendTypeEnvList env things
450 = extendNameEnvList env [(getName thing, thing) | thing <- things]
452 extendTypeEnvWithIds :: TypeEnv -> [Id] -> TypeEnv
453 extendTypeEnvWithIds env ids
454 = extendNameEnvList env [(getName id, AnId id) | id <- ids]
458 lookupType :: HomePackageTable -> PackageTypeEnv -> Name -> Maybe TyThing
459 lookupType hpt pte name
460 = case lookupModuleEnv hpt (nameModule name) of
461 Just details -> lookupNameEnv (md_types (hm_details details)) name
462 Nothing -> lookupNameEnv pte name
465 %************************************************************************
467 \subsection{Auxiliary types}
469 %************************************************************************
471 These types are defined here because they are mentioned in ModDetails,
472 but they are mostly elaborated elsewhere
477 vers_module :: Version, -- Changes when anything changes
478 vers_exports :: Version, -- Changes when export list changes
479 vers_rules :: Version, -- Changes when any rule changes
480 vers_decls :: NameEnv Version
481 -- Versions for "big" names only (not data constructors, class ops)
482 -- The version of an Id changes if its fixity changes
483 -- Ditto data constructors, class operations, except that the version of
484 -- the parent class/tycon changes
486 -- If a name isn't in the map, it means 'initialVersion'
489 initialVersionInfo :: VersionInfo
490 initialVersionInfo = VersionInfo { vers_module = initialVersion,
491 vers_exports = initialVersion,
492 vers_rules = initialVersion,
493 vers_decls = emptyNameEnv
496 lookupVersion :: NameEnv Version -> Name -> Version
497 lookupVersion env name = lookupNameEnv env name `orElse` initialVersion
499 data Deprecations = NoDeprecs
500 | DeprecAll DeprecTxt -- Whole module deprecated
501 | DeprecSome (NameEnv (Name,DeprecTxt)) -- Some things deprecated
503 -- We keep the Name in the range, so we can print them out
505 lookupDeprec :: Deprecations -> Name -> Maybe DeprecTxt
506 lookupDeprec NoDeprecs name = Nothing
507 lookupDeprec (DeprecAll txt) name = Just txt
508 lookupDeprec (DeprecSome env) name = case lookupNameEnv env name of
509 Just (_, txt) -> Just txt
512 plusDeprecs :: Deprecations -> Deprecations -> Deprecations
513 plusDeprecs d NoDeprecs = d
514 plusDeprecs NoDeprecs d = d
515 plusDeprecs d (DeprecAll t) = DeprecAll t
516 plusDeprecs (DeprecAll t) d = DeprecAll t
517 plusDeprecs (DeprecSome v1) (DeprecSome v2) = DeprecSome (v1 `plusNameEnv` v2)
519 instance Eq Deprecations where
520 -- Used when checking whether we need write a new interface
521 NoDeprecs == NoDeprecs = True
522 (DeprecAll t1) == (DeprecAll t2) = t1 == t2
523 (DeprecSome e1) == (DeprecSome e2) = nameEnvElts e1 == nameEnvElts e2
529 type Avails = [AvailInfo]
530 type AvailInfo = GenAvailInfo Name
531 type RdrAvailInfo = GenAvailInfo OccName
533 data GenAvailInfo name = Avail name -- An ordinary identifier
534 | AvailTC name -- The name of the type or class
535 [name] -- The available pieces of type/class.
536 -- NB: If the type or class is itself
537 -- to be in scope, it must be in this list.
538 -- Thus, typically: AvailTC Eq [Eq, ==, /=]
540 -- Equality used when deciding if the interface has changed
542 type RdrExportItem = (ModuleName, [RdrAvailInfo])
543 type ExportItem = (ModuleName, [AvailInfo])
545 availsToNameSet :: [AvailInfo] -> NameSet
546 availsToNameSet avails = foldl add emptyNameSet avails
548 add set avail = addListToNameSet set (availNames avail)
550 availName :: GenAvailInfo name -> name
551 availName (Avail n) = n
552 availName (AvailTC n _) = n
554 availNames :: GenAvailInfo name -> [name]
555 availNames (Avail n) = [n]
556 availNames (AvailTC n ns) = ns
558 instance Outputable n => Outputable (GenAvailInfo n) where
561 pprAvail :: Outputable n => GenAvailInfo n -> SDoc
562 pprAvail (AvailTC n ns) = ppr n <> case {- filter (/= n) -} ns of
564 ns' -> braces (hsep (punctuate comma (map ppr ns')))
566 pprAvail (Avail n) = ppr n
570 type FixityEnv = NameEnv (FixitySig Name)
571 -- We keep the whole fixity sig so that we
572 -- can report line-number info when there is a duplicate
573 -- fixity declaration
575 emptyFixityEnv :: FixityEnv
576 emptyFixityEnv = emptyNameEnv
578 lookupFixity :: FixityEnv -> Name -> Fixity
579 lookupFixity env n = case lookupNameEnv env n of
580 Just (FixitySig _ fix _) -> fix
581 Nothing -> defaultFixity
583 collectFixities :: FixityEnv -> [TyClDecl Name] -> [FixitySig Name]
584 -- Collect fixities for the specified declarations
585 collectFixities env decls
587 | d <- decls, (n,_) <- tyClDeclNames d,
588 Just fix <- [lookupNameEnv env n]
593 %************************************************************************
595 \subsection{WhatsImported}
597 %************************************************************************
600 type WhetherHasOrphans = Bool
602 -- * an instance decl in a module other than the defn module for
603 -- one of the tycons or classes in the instance head
604 -- * a transformation rule in a module other than the one defining
605 -- the function in the head of the rule.
607 type IsBootInterface = Bool
609 type ImportVersion name = (ModuleName, WhetherHasOrphans, IsBootInterface, WhatsImported name)
611 data WhatsImported name = NothingAtAll -- The module is below us in the
612 -- hierarchy, but we import nothing
613 -- Used for orphan modules, so they appear
616 | Everything Version -- Used for modules from other packages;
617 -- we record only the module's version number
620 Version -- Module version
621 (Maybe Version) -- Export-list version, if we depend on it
622 [(name,Version)] -- List guaranteed non-empty
623 Version -- Rules version
626 -- 'Specifically' doesn't let you say "I imported f but none of the rules in
627 -- the module". If you use anything in the module you get its rule version
628 -- So if the rules change, you'll recompile, even if you don't use them.
629 -- This is easy to implement, and it's safer: you might not have used the rules last
630 -- time round, but if someone has added a new rule you might need it this time
632 -- The export list field is (Just v) if we depend on the export list:
633 -- we imported the module without saying exactly what we imported
634 -- We need to recompile if the module exports changes, because we might
635 -- now have a name clash in the importing module.
639 %************************************************************************
641 \subsection{The persistent compiler state}
643 %************************************************************************
645 The @PersistentCompilerState@ persists across successive calls to the
649 data PersistentCompilerState
651 pcs_nc :: !NameCache,
652 pcs_EPS :: !ExternalPackageState
658 type PackageTypeEnv = TypeEnv
659 type PackageRuleBase = RuleBase
660 type PackageInstEnv = InstEnv
662 data ExternalPackageState
664 eps_PIT :: !PackageIfaceTable,
665 -- The ModuleIFaces for modules in external packages
666 -- whose interfaces we have opened
667 -- The declarations in these interface files are held in
668 -- eps_decls, eps_insts, eps_rules (below), not in the
669 -- mi_decls fields of the iPIT.
670 -- What _is_ in the iPIT is:
677 eps_imp_mods :: !ImportedModuleInfo,
678 -- Modules that we know something about, because they are mentioned
679 -- in interface files, BUT which we have not loaded yet.
680 -- No module is both in here and in the PIT
682 eps_PTE :: !PackageTypeEnv, -- Domain = external-package modules
684 eps_inst_env :: !PackageInstEnv, -- The total InstEnv accumulated from
685 -- all the external-package modules
686 eps_rule_base :: !PackageRuleBase, -- Ditto RuleEnv
689 -- Holding pens for stuff that has been read in from file,
690 -- but not yet slurped into the renamer
691 eps_decls :: !DeclsMap,
692 -- A single, global map of Names to unslurped decls
693 eps_insts :: !IfaceInsts,
694 -- The as-yet un-slurped instance decls; this bag is depleted when we
695 -- slurp an instance decl so that we don't slurp the same one twice.
696 -- Each is 'gated' by the names that must be available before
697 -- this instance decl is needed.
698 eps_rules :: !IfaceRules,
699 -- Similar to instance decls, only for rules
701 eps_inst_gates :: !NameSet -- Gates for instance decls
702 -- The instance gates must accumulate across
703 -- all invocations of the renamer;
704 -- see "the gating story" in RnIfaces.lhs
705 -- These names should all be from other packages;
706 -- for the home package we have all the instance
707 -- declarations anyhow
711 The NameCache makes sure that there is just one Unique assigned for
712 each original name; i.e. (module-name, occ-name) pair. The Name is
713 always stored as a Global, and has the SrcLoc of its binding location.
714 Actually that's not quite right. When we first encounter the original
715 name, we might not be at its binding site (e.g. we are reading an
716 interface file); so we give it 'noSrcLoc' then. Later, when we find
717 its binding site, we fix it up.
719 Exactly the same is true of the Module stored in the Name. When we first
720 encounter the occurrence, we may not know the details of the module, so
721 we just store junk. Then when we find the binding site, we fix it up.
725 = NameCache { nsUniqs :: UniqSupply,
727 nsNames :: OrigNameCache,
728 -- Ensures that one original name gets one unique
729 nsIPs :: OrigIParamCache
730 -- Ensures that one implicit parameter name gets one unique
733 type OrigNameCache = FiniteMap (ModuleName,OccName) Name
734 type OrigIParamCache = FiniteMap (IPName RdrName) (IPName Name)
737 @ImportedModuleInfo@ contains info ONLY about modules that have not yet
738 been loaded into the iPIT. These modules are mentioned in interfaces we've
739 already read, so we know a tiny bit about them, but we havn't yet looked
740 at the interface file for the module itself. It needs to persist across
741 invocations of the renamer, at least from Rename.checkOldIface to Rename.renameSource.
742 And there's no harm in it persisting across multiple compilations.
745 type ImportedModuleInfo
746 = FiniteMap ModuleName (WhetherHasOrphans, IsBootInterface)
749 A DeclsMap contains a binding for each Name in the declaration
750 including the constructors of a type decl etc. The Bool is True just
754 type DeclsMap = (NameEnv (AvailInfo, Bool, (Module, TyClDecl RdrName)), Int)
755 -- The Int says how many have been sucked in
757 type IfaceInsts = GatedDecls (InstDecl RdrName)
758 type IfaceRules = GatedDecls (RuleDecl RdrName)
760 type GatedDecls d = (Bag (GatedDecl d), Int) -- The Int says how many have been sucked in
761 type GatedDecl d = (GateFn, (Module, d))
762 type GateFn = (Name -> Bool) -> Bool -- Returns True <=> gate is open
763 -- The (Name -> Bool) fn returns True for visible Names
764 -- For example, suppose this is in an interface file
765 -- instance C T where ...
766 -- We want to slurp this decl if both C and T are "visible" in
767 -- the importing module. See "The gating story" in RnIfaces for details.
771 %************************************************************************
773 \subsection{Linkable stuff}
775 %************************************************************************
777 This stuff is in here, rather than (say) in Linker.lhs, because the Linker.lhs
778 stuff is the *dynamic* linker, and isn't present in a stage-1 compiler
782 linkableTime :: ClockTime, -- Time at which this linkable was built
783 -- (i.e. when the bytecodes were produced,
784 -- or the mod date on the files)
785 linkableModName :: ModuleName, -- Should be Module, but see below
786 linkableUnlinked :: [Unlinked]
789 isObjectLinkable :: Linkable -> Bool
790 isObjectLinkable l = all isObject (linkableUnlinked l)
792 instance Outputable Linkable where
793 ppr (LM when_made mod unlinkeds)
794 = (text "LinkableM" <+> parens (text (show when_made)) <+> ppr mod)
795 $$ nest 3 (ppr unlinkeds)
797 -------------------------------------------
802 | BCOs CompiledByteCode
805 data CompiledByteCode = NoByteCode
808 instance Outputable Unlinked where
809 ppr (DotO path) = text "DotO" <+> text path
810 ppr (DotA path) = text "DotA" <+> text path
811 ppr (DotDLL path) = text "DotDLL" <+> text path
813 ppr (BCOs bcos) = text "BCOs" <+> ppr bcos
815 ppr (BCOs bcos) = text "No byte code"
818 isObject (DotO _) = True
819 isObject (DotA _) = True
820 isObject (DotDLL _) = True
823 isInterpretable = not . isObject
825 nameOfObject (DotO fn) = fn
826 nameOfObject (DotA fn) = fn
827 nameOfObject (DotDLL fn) = fn
829 byteCodeOfObject (BCOs bc) = bc
833 %************************************************************************
835 \subsection{Provenance and export info}
837 %************************************************************************
839 A LocalRdrEnv is used for local bindings (let, where, lambda, case)
843 type LocalRdrEnv = RdrNameEnv Name
845 extendLocalRdrEnv :: LocalRdrEnv -> [Name] -> LocalRdrEnv
846 extendLocalRdrEnv env names
847 = addListToRdrEnv env [(mkRdrUnqual (nameOccName n), n) | n <- names]
850 The GlobalRdrEnv gives maps RdrNames to Names. There is a separate
851 one for each module, corresponding to that module's top-level scope.
854 type GlobalRdrEnv = RdrNameEnv [GlobalRdrElt]
855 -- The list is because there may be name clashes
856 -- These only get reported on lookup, not on construction
858 emptyGlobalRdrEnv = emptyRdrEnv
861 = GRE { gre_name :: Name,
862 gre_parent :: Name, -- Name of the "parent" structure
863 -- * the tycon of a data con
864 -- * the class of a class op
865 -- For others it's just the same as gre_name
866 gre_prov :: Provenance, -- Why it's in scope
867 gre_deprec :: Maybe DeprecTxt -- Whether this name is deprecated
870 instance Outputable GlobalRdrElt where
871 ppr gre = ppr (gre_name gre) <+>
872 parens (hsep [text "parent:" <+> ppr (gre_parent gre) <> comma,
873 pprNameProvenance gre])
875 = vcat (map pp (rdrEnvToList env))
877 pp (rn, gres) = ppr rn <> colon <+>
878 vcat [ ppr (gre_name gre) <+> pprNameProvenance gre
881 isLocalGRE :: GlobalRdrElt -> Bool
882 isLocalGRE (GRE {gre_prov = LocalDef}) = True
883 isLocalGRE other = False
886 @unQualInScope@ returns a function that takes a @Name@ and tells whether
887 its unqualified name is in scope. This is put as a boolean flag in
888 the @Name@'s provenance to guide whether or not to print the name qualified
892 unQualInScope :: GlobalRdrEnv -> Name -> Bool
893 -- True if 'f' is in scope, and has only one binding,
894 -- and the thing it is bound to is the name we are looking for
895 -- (i.e. false if A.f and B.f are both in scope as unqualified 'f')
897 -- Also checks for built-in syntax, which is always 'in scope'
899 -- This fn is only efficient if the shared
900 -- partial application is used a lot.
902 = \n -> n `elemNameSet` unqual_names || isBuiltInSyntaxName n
904 unqual_names :: NameSet
905 unqual_names = foldRdrEnv add emptyNameSet env
906 add rdr_name [gre] unquals | isUnqual rdr_name = addOneToNameSet unquals (gre_name gre)
907 add _ _ unquals = unquals
910 The "provenance" of something says how it came to be in scope.
914 = LocalDef -- Defined locally
916 | NonLocalDef -- Defined non-locally
919 -- Just used for grouping error messages (in RnEnv.warnUnusedBinds)
920 instance Eq Provenance where
921 p1 == p2 = case p1 `compare` p2 of EQ -> True; _ -> False
923 instance Eq ImportReason where
924 p1 == p2 = case p1 `compare` p2 of EQ -> True; _ -> False
926 instance Ord Provenance where
927 compare LocalDef LocalDef = EQ
928 compare LocalDef (NonLocalDef _) = LT
929 compare (NonLocalDef _) LocalDef = GT
931 compare (NonLocalDef reason1) (NonLocalDef reason2)
932 = compare reason1 reason2
934 instance Ord ImportReason where
935 compare ImplicitImport ImplicitImport = EQ
936 compare ImplicitImport (UserImport _ _ _) = LT
937 compare (UserImport _ _ _) ImplicitImport = GT
938 compare (UserImport m1 loc1 _) (UserImport m2 loc2 _)
939 = (m1 `compare` m2) `thenCmp` (loc1 `compare` loc2)
943 = UserImport Module SrcLoc Bool -- Imported from module M on line L
944 -- Note the M may well not be the defining module
946 -- The Bool is true iff the thing was named *explicitly* in the import spec,
947 -- rather than being imported as part of a group; e.g.
950 -- Here, everything imported by B, and the constructors of T
951 -- are not named explicitly; only T is named explicitly.
952 -- This info is used when warning of unused names.
954 | ImplicitImport -- Imported implicitly for some other reason
958 hasBetterProv :: Provenance -> Provenance -> Bool
960 -- a local thing over an imported thing
961 -- a user-imported thing over a non-user-imported thing
962 -- an explicitly-imported thing over an implicitly imported thing
963 hasBetterProv LocalDef _ = True
964 hasBetterProv (NonLocalDef (UserImport _ _ _ )) (NonLocalDef ImplicitImport) = True
965 hasBetterProv _ _ = False
967 pprNameProvenance :: GlobalRdrElt -> SDoc
968 pprNameProvenance (GRE {gre_name = name, gre_prov = prov})
970 LocalDef -> ptext SLIT("defined at") <+> ppr (nameSrcLoc name)
971 NonLocalDef why -> sep [ppr_reason why,
972 nest 2 (ppr_defn (nameSrcLoc name))]
974 ppr_reason ImplicitImport = ptext SLIT("implicitly imported")
975 ppr_reason (UserImport mod loc _) = ptext SLIT("imported from") <+> ppr mod <+> ptext SLIT("at") <+> ppr loc
977 ppr_defn loc | isGoodSrcLoc loc = parens (ptext SLIT("at") <+> ppr loc)