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 DataCon ( dataConWorkId, dataConWrapId )
85 import Packages ( PackageName, preludePackage )
86 import CmdLineOpts ( DynFlags )
88 import BasicTypes ( Version, initialVersion, IPName,
89 Fixity, FixitySig(..), defaultFixity )
91 import HsSyn ( DeprecTxt, TyClDecl, tyClDeclName, ifaceRuleDeclName,
93 import RdrHsSyn ( RdrNameInstDecl, RdrNameRuleDecl, RdrNameTyClDecl )
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, RdrNameTyClDecl)], -- Local definitions
359 pi_fixity :: [FixitySig RdrName], -- Local fixity declarations,
360 pi_insts :: [RdrNameInstDecl], -- Local instance declarations
361 pi_rules :: (Version, [RdrNameRuleDecl]), -- 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 data TyThing = AnId Id
414 isTyClThing :: TyThing -> Bool
415 isTyClThing (ATyCon _) = True
416 isTyClThing (AClass _) = True
417 isTyClThing (AnId _) = False
419 instance NamedThing TyThing where
420 getName (AnId id) = getName id
421 getName (ATyCon tc) = getName tc
422 getName (AClass cl) = getName cl
424 instance Outputable TyThing where
425 ppr (AnId id) = ptext SLIT("AnId") <+> ppr id
426 ppr (ATyCon tc) = ptext SLIT("ATyCon") <+> ppr tc
427 ppr (AClass cl) = ptext SLIT("AClass") <+> ppr cl
430 typeEnvElts :: TypeEnv -> [TyThing]
431 typeEnvClasses :: TypeEnv -> [Class]
432 typeEnvTyCons :: TypeEnv -> [TyCon]
433 typeEnvIds :: TypeEnv -> [Id]
435 typeEnvElts env = nameEnvElts env
436 typeEnvClasses env = [cl | AClass cl <- typeEnvElts env]
437 typeEnvTyCons env = [tc | ATyCon tc <- typeEnvElts env]
438 typeEnvIds env = [id | AnId id <- typeEnvElts env]
440 implicitTyThingIds :: [TyThing] -> [Id]
441 -- Add the implicit data cons and selectors etc
442 implicitTyThingIds things
443 = concat (map go things)
446 go (AClass cl) = classSelIds cl
447 go (ATyCon tc) = tyConGenIds tc ++
449 [ n | dc <- tyConDataCons_maybe tc `orElse` [],
450 n <- implicitConIds tc dc]
451 -- Synonyms return empty list of constructors and selectors
453 implicitConIds tc dc -- Newtypes have a constructor wrapper,
455 | isNewTyCon tc = [dataConWrapId dc]
456 | otherwise = [dataConWorkId dc, dataConWrapId dc]
461 type TypeEnv = NameEnv TyThing
463 emptyTypeEnv = emptyNameEnv
465 mkTypeEnv :: [TyThing] -> TypeEnv
466 mkTypeEnv things = extendTypeEnvList emptyTypeEnv things
468 extendTypeEnvList :: TypeEnv -> [TyThing] -> TypeEnv
469 extendTypeEnvList env things
470 = extendNameEnvList env [(getName thing, thing) | thing <- things]
472 extendTypeEnvWithIds :: TypeEnv -> [Id] -> TypeEnv
473 extendTypeEnvWithIds env ids
474 = extendNameEnvList env [(getName id, AnId id) | id <- ids]
478 lookupType :: HomePackageTable -> PackageTypeEnv -> Name -> Maybe TyThing
479 lookupType hpt pte name
480 = case lookupModuleEnv hpt (nameModule name) of
481 Just details -> lookupNameEnv (md_types (hm_details details)) name
482 Nothing -> lookupNameEnv pte name
485 %************************************************************************
487 \subsection{Auxiliary types}
489 %************************************************************************
491 These types are defined here because they are mentioned in ModDetails,
492 but they are mostly elaborated elsewhere
497 vers_module :: Version, -- Changes when anything changes
498 vers_exports :: Version, -- Changes when export list changes
499 vers_rules :: Version, -- Changes when any rule changes
500 vers_decls :: NameEnv Version
501 -- Versions for "big" names only (not data constructors, class ops)
502 -- The version of an Id changes if its fixity changes
503 -- Ditto data constructors, class operations, except that the version of
504 -- the parent class/tycon changes
506 -- If a name isn't in the map, it means 'initialVersion'
509 initialVersionInfo :: VersionInfo
510 initialVersionInfo = VersionInfo { vers_module = initialVersion,
511 vers_exports = initialVersion,
512 vers_rules = initialVersion,
513 vers_decls = emptyNameEnv
516 lookupVersion :: NameEnv Version -> Name -> Version
517 lookupVersion env name = lookupNameEnv env name `orElse` initialVersion
519 data Deprecations = NoDeprecs
520 | DeprecAll DeprecTxt -- Whole module deprecated
521 | DeprecSome (NameEnv (Name,DeprecTxt)) -- Some things deprecated
523 -- We keep the Name in the range, so we can print them out
525 lookupDeprec :: Deprecations -> Name -> Maybe DeprecTxt
526 lookupDeprec NoDeprecs name = Nothing
527 lookupDeprec (DeprecAll txt) name = Just txt
528 lookupDeprec (DeprecSome env) name = case lookupNameEnv env name of
529 Just (_, txt) -> Just txt
532 plusDeprecs :: Deprecations -> Deprecations -> Deprecations
533 plusDeprecs d NoDeprecs = d
534 plusDeprecs NoDeprecs d = d
535 plusDeprecs d (DeprecAll t) = DeprecAll t
536 plusDeprecs (DeprecAll t) d = DeprecAll t
537 plusDeprecs (DeprecSome v1) (DeprecSome v2) = DeprecSome (v1 `plusNameEnv` v2)
539 instance Eq Deprecations where
540 -- Used when checking whether we need write a new interface
541 NoDeprecs == NoDeprecs = True
542 (DeprecAll t1) == (DeprecAll t2) = t1 == t2
543 (DeprecSome e1) == (DeprecSome e2) = nameEnvElts e1 == nameEnvElts e2
549 type Avails = [AvailInfo]
550 type AvailInfo = GenAvailInfo Name
551 type RdrAvailInfo = GenAvailInfo OccName
553 data GenAvailInfo name = Avail name -- An ordinary identifier
554 | AvailTC name -- The name of the type or class
555 [name] -- The available pieces of type/class.
556 -- NB: If the type or class is itself
557 -- to be in scope, it must be in this list.
558 -- Thus, typically: AvailTC Eq [Eq, ==, /=]
560 -- Equality used when deciding if the interface has changed
562 type RdrExportItem = (ModuleName, [RdrAvailInfo])
563 type ExportItem = (ModuleName, [AvailInfo])
565 availsToNameSet :: [AvailInfo] -> NameSet
566 availsToNameSet avails = foldl add emptyNameSet avails
568 add set avail = addListToNameSet set (availNames avail)
570 availName :: GenAvailInfo name -> name
571 availName (Avail n) = n
572 availName (AvailTC n _) = n
574 availNames :: GenAvailInfo name -> [name]
575 availNames (Avail n) = [n]
576 availNames (AvailTC n ns) = ns
578 instance Outputable n => Outputable (GenAvailInfo n) where
581 pprAvail :: Outputable n => GenAvailInfo n -> SDoc
582 pprAvail (AvailTC n ns) = ppr n <> case {- filter (/= n) -} ns of
584 ns' -> braces (hsep (punctuate comma (map ppr ns')))
586 pprAvail (Avail n) = ppr n
590 type FixityEnv = NameEnv (FixitySig Name)
591 -- We keep the whole fixity sig so that we
592 -- can report line-number info when there is a duplicate
593 -- fixity declaration
595 emptyFixityEnv :: FixityEnv
596 emptyFixityEnv = emptyNameEnv
598 lookupFixity :: FixityEnv -> Name -> Fixity
599 lookupFixity env n = case lookupNameEnv env n of
600 Just (FixitySig _ fix _) -> fix
601 Nothing -> defaultFixity
603 collectFixities :: FixityEnv -> [TyClDecl Name] -> [FixitySig Name]
604 -- Collect fixities for the specified declarations
605 collectFixities env decls
607 | d <- decls, (n,_) <- tyClDeclNames d,
608 Just fix <- [lookupNameEnv env n]
613 %************************************************************************
615 \subsection{WhatsImported}
617 %************************************************************************
620 type WhetherHasOrphans = Bool
622 -- * an instance decl in a module other than the defn module for
623 -- one of the tycons or classes in the instance head
624 -- * a transformation rule in a module other than the one defining
625 -- the function in the head of the rule.
627 type IsBootInterface = Bool
629 type ImportVersion name = (ModuleName, WhetherHasOrphans, IsBootInterface, WhatsImported name)
631 data WhatsImported name = NothingAtAll -- The module is below us in the
632 -- hierarchy, but we import nothing
633 -- Used for orphan modules, so they appear
636 | Everything Version -- Used for modules from other packages;
637 -- we record only the module's version number
640 Version -- Module version
641 (Maybe Version) -- Export-list version, if we depend on it
642 [(name,Version)] -- List guaranteed non-empty
643 Version -- Rules version
646 -- 'Specifically' doesn't let you say "I imported f but none of the rules in
647 -- the module". If you use anything in the module you get its rule version
648 -- So if the rules change, you'll recompile, even if you don't use them.
649 -- This is easy to implement, and it's safer: you might not have used the rules last
650 -- time round, but if someone has added a new rule you might need it this time
652 -- The export list field is (Just v) if we depend on the export list:
653 -- we imported the module without saying exactly what we imported
654 -- We need to recompile if the module exports changes, because we might
655 -- now have a name clash in the importing module.
659 %************************************************************************
661 \subsection{The persistent compiler state}
663 %************************************************************************
665 The @PersistentCompilerState@ persists across successive calls to the
669 data PersistentCompilerState
671 pcs_nc :: !NameCache,
672 pcs_EPS :: !ExternalPackageState
678 type PackageTypeEnv = TypeEnv
679 type PackageRuleBase = RuleBase
680 type PackageInstEnv = InstEnv
682 data ExternalPackageState
684 eps_PIT :: !PackageIfaceTable,
685 -- The ModuleIFaces for modules in external packages
686 -- whose interfaces we have opened
687 -- The declarations in these interface files are held in
688 -- eps_decls, eps_insts, eps_rules (below), not in the
689 -- mi_decls fields of the iPIT.
690 -- What _is_ in the iPIT is:
697 eps_imp_mods :: !ImportedModuleInfo,
698 -- Modules that we know something about, because they are mentioned
699 -- in interface files, BUT which we have not loaded yet.
700 -- No module is both in here and in the PIT
702 eps_PTE :: !PackageTypeEnv, -- Domain = external-package modules
704 eps_inst_env :: !PackageInstEnv, -- The total InstEnv accumulated from
705 -- all the external-package modules
706 eps_rule_base :: !PackageRuleBase, -- Ditto RuleEnv
709 -- Holding pens for stuff that has been read in from file,
710 -- but not yet slurped into the renamer
711 eps_decls :: !DeclsMap,
712 -- A single, global map of Names to unslurped decls
713 eps_insts :: !IfaceInsts,
714 -- The as-yet un-slurped instance decls; this bag is depleted when we
715 -- slurp an instance decl so that we don't slurp the same one twice.
716 -- Each is 'gated' by the names that must be available before
717 -- this instance decl is needed.
718 eps_rules :: !IfaceRules,
719 -- Similar to instance decls, only for rules
721 eps_inst_gates :: !NameSet -- Gates for instance decls
722 -- The instance gates must accumulate across
723 -- all invocations of the renamer;
724 -- see "the gating story" in RnIfaces.lhs
725 -- These names should all be from other packages;
726 -- for the home package we have all the instance
727 -- declarations anyhow
731 The NameCache makes sure that there is just one Unique assigned for
732 each original name; i.e. (module-name, occ-name) pair. The Name is
733 always stored as a Global, and has the SrcLoc of its binding location.
734 Actually that's not quite right. When we first encounter the original
735 name, we might not be at its binding site (e.g. we are reading an
736 interface file); so we give it 'noSrcLoc' then. Later, when we find
737 its binding site, we fix it up.
739 Exactly the same is true of the Module stored in the Name. When we first
740 encounter the occurrence, we may not know the details of the module, so
741 we just store junk. Then when we find the binding site, we fix it up.
745 = NameCache { nsUniqs :: UniqSupply,
747 nsNames :: OrigNameCache,
748 -- Ensures that one original name gets one unique
749 nsIPs :: OrigIParamCache
750 -- Ensures that one implicit parameter name gets one unique
753 type OrigNameCache = FiniteMap (ModuleName,OccName) Name
754 type OrigIParamCache = FiniteMap (IPName RdrName) (IPName Name)
757 @ImportedModuleInfo@ contains info ONLY about modules that have not yet
758 been loaded into the iPIT. These modules are mentioned in interfaces we've
759 already read, so we know a tiny bit about them, but we havn't yet looked
760 at the interface file for the module itself. It needs to persist across
761 invocations of the renamer, at least from Rename.checkOldIface to Rename.renameSource.
762 And there's no harm in it persisting across multiple compilations.
765 type ImportedModuleInfo
766 = FiniteMap ModuleName (WhetherHasOrphans, IsBootInterface)
769 A DeclsMap contains a binding for each Name in the declaration
770 including the constructors of a type decl etc. The Bool is True just
774 type DeclsMap = (NameEnv (AvailInfo, Bool, (Module, RdrNameTyClDecl)), Int)
775 -- The Int says how many have been sucked in
777 type IfaceInsts = GatedDecls RdrNameInstDecl
778 type IfaceRules = GatedDecls RdrNameRuleDecl
780 type GatedDecls d = (Bag (GatedDecl d), Int) -- The Int says how many have been sucked in
781 type GatedDecl d = (GateFn, (Module, d))
782 type GateFn = (Name -> Bool) -> Bool -- Returns True <=> gate is open
783 -- The (Name -> Bool) fn returns True for visible Names
784 -- For example, suppose this is in an interface file
785 -- instance C T where ...
786 -- We want to slurp this decl if both C and T are "visible" in
787 -- the importing module. See "The gating story" in RnIfaces for details.
791 %************************************************************************
793 \subsection{Linkable stuff}
795 %************************************************************************
797 This stuff is in here, rather than (say) in Linker.lhs, because the Linker.lhs
798 stuff is the *dynamic* linker, and isn't present in a stage-1 compiler
802 linkableTime :: ClockTime, -- Time at which this linkable was built
803 -- (i.e. when the bytecodes were produced,
804 -- or the mod date on the files)
805 linkableModName :: ModuleName, -- Should be Module, but see below
806 linkableUnlinked :: [Unlinked]
809 isObjectLinkable :: Linkable -> Bool
810 isObjectLinkable l = all isObject (linkableUnlinked l)
812 instance Outputable Linkable where
813 ppr (LM when_made mod unlinkeds)
814 = (text "LinkableM" <+> parens (text (show when_made)) <+> ppr mod)
815 $$ nest 3 (ppr unlinkeds)
817 -------------------------------------------
822 | BCOs CompiledByteCode
825 data CompiledByteCode = NoByteCode
828 instance Outputable Unlinked where
829 ppr (DotO path) = text "DotO" <+> text path
830 ppr (DotA path) = text "DotA" <+> text path
831 ppr (DotDLL path) = text "DotDLL" <+> text path
833 ppr (BCOs bcos) = text "BCOs" <+> ppr bcos
835 ppr (BCOs bcos) = text "No byte code"
838 isObject (DotO _) = True
839 isObject (DotA _) = True
840 isObject (DotDLL _) = True
843 isInterpretable = not . isObject
845 nameOfObject (DotO fn) = fn
846 nameOfObject (DotA fn) = fn
847 nameOfObject (DotDLL fn) = fn
849 byteCodeOfObject (BCOs bc) = bc
853 %************************************************************************
855 \subsection{Provenance and export info}
857 %************************************************************************
859 A LocalRdrEnv is used for local bindings (let, where, lambda, case)
863 type LocalRdrEnv = RdrNameEnv Name
865 extendLocalRdrEnv :: LocalRdrEnv -> [Name] -> LocalRdrEnv
866 extendLocalRdrEnv env names
867 = addListToRdrEnv env [(mkRdrUnqual (nameOccName n), n) | n <- names]
870 The GlobalRdrEnv gives maps RdrNames to Names. There is a separate
871 one for each module, corresponding to that module's top-level scope.
874 type GlobalRdrEnv = RdrNameEnv [GlobalRdrElt]
875 -- The list is because there may be name clashes
876 -- These only get reported on lookup, not on construction
878 emptyGlobalRdrEnv = emptyRdrEnv
881 = GRE { gre_name :: Name,
882 gre_parent :: Name, -- Name of the "parent" structure
883 -- * the tycon of a data con
884 -- * the class of a class op
885 -- For others it's just the same as gre_name
886 gre_prov :: Provenance, -- Why it's in scope
887 gre_deprec :: Maybe DeprecTxt -- Whether this name is deprecated
890 instance Outputable GlobalRdrElt where
891 ppr gre = ppr (gre_name gre) <+>
892 parens (hsep [text "parent:" <+> ppr (gre_parent gre) <> comma,
893 pprNameProvenance gre])
895 = vcat (map pp (rdrEnvToList env))
897 pp (rn, gres) = ppr rn <> colon <+>
898 vcat [ ppr (gre_name gre) <+> pprNameProvenance gre
901 isLocalGRE :: GlobalRdrElt -> Bool
902 isLocalGRE (GRE {gre_prov = LocalDef}) = True
903 isLocalGRE other = False
906 @unQualInScope@ returns a function that takes a @Name@ and tells whether
907 its unqualified name is in scope. This is put as a boolean flag in
908 the @Name@'s provenance to guide whether or not to print the name qualified
912 unQualInScope :: GlobalRdrEnv -> Name -> Bool
913 -- True if 'f' is in scope, and has only one binding,
914 -- and the thing it is bound to is the name we are looking for
915 -- (i.e. false if A.f and B.f are both in scope as unqualified 'f')
917 -- Also checks for built-in syntax, which is always 'in scope'
919 -- This fn is only efficient if the shared
920 -- partial application is used a lot.
922 = \n -> n `elemNameSet` unqual_names || isBuiltInSyntaxName n
924 unqual_names :: NameSet
925 unqual_names = foldRdrEnv add emptyNameSet env
926 add rdr_name [gre] unquals | isUnqual rdr_name = addOneToNameSet unquals (gre_name gre)
927 add _ _ unquals = unquals
930 The "provenance" of something says how it came to be in scope.
934 = LocalDef -- Defined locally
936 | NonLocalDef -- Defined non-locally
939 -- Just used for grouping error messages (in RnEnv.warnUnusedBinds)
940 instance Eq Provenance where
941 p1 == p2 = case p1 `compare` p2 of EQ -> True; _ -> False
943 instance Eq ImportReason where
944 p1 == p2 = case p1 `compare` p2 of EQ -> True; _ -> False
946 instance Ord Provenance where
947 compare LocalDef LocalDef = EQ
948 compare LocalDef (NonLocalDef _) = LT
949 compare (NonLocalDef _) LocalDef = GT
951 compare (NonLocalDef reason1) (NonLocalDef reason2)
952 = compare reason1 reason2
954 instance Ord ImportReason where
955 compare ImplicitImport ImplicitImport = EQ
956 compare ImplicitImport (UserImport _ _ _) = LT
957 compare (UserImport _ _ _) ImplicitImport = GT
958 compare (UserImport m1 loc1 _) (UserImport m2 loc2 _)
959 = (m1 `compare` m2) `thenCmp` (loc1 `compare` loc2)
963 = UserImport Module SrcLoc Bool -- Imported from module M on line L
964 -- Note the M may well not be the defining module
966 -- The Bool is true iff the thing was named *explicitly* in the import spec,
967 -- rather than being imported as part of a group; e.g.
970 -- Here, everything imported by B, and the constructors of T
971 -- are not named explicitly; only T is named explicitly.
972 -- This info is used when warning of unused names.
974 | ImplicitImport -- Imported implicitly for some other reason
978 hasBetterProv :: Provenance -> Provenance -> Bool
980 -- a local thing over an imported thing
981 -- a user-imported thing over a non-user-imported thing
982 -- an explicitly-imported thing over an implicitly imported thing
983 hasBetterProv LocalDef _ = True
984 hasBetterProv (NonLocalDef (UserImport _ _ _ )) (NonLocalDef ImplicitImport) = True
985 hasBetterProv _ _ = False
987 pprNameProvenance :: GlobalRdrElt -> SDoc
988 pprNameProvenance (GRE {gre_name = name, gre_prov = prov})
990 LocalDef -> ptext SLIT("defined at") <+> ppr (nameSrcLoc name)
991 NonLocalDef why -> sep [ppr_reason why,
992 nest 2 (ppr_defn (nameSrcLoc name))]
994 ppr_reason ImplicitImport = ptext SLIT("implicitly imported")
995 ppr_reason (UserImport mod loc _) = ptext SLIT("imported from") <+> ppr mod <+> ptext SLIT("at") <+> ppr loc
997 ppr_defn loc | isGoodSrcLoc loc = parens (ptext SLIT("at") <+> ppr loc)