2 % (c) The University of Glasgow, 2000
4 \section[HscTypes]{Types for the per-module compiler}
9 GhciMode(..), isOneShot,
12 ModGuts(..), ModImports(..), ForeignStubs(..),
14 ModSummary(..), showModMsg,
15 msHsFilePath, msHiFilePath, msObjFilePath,
17 HscSource(..), isHsBoot, hscSourceString, -- Re-exported from DriverPhases
19 HomePackageTable, HomeModInfo(..), emptyHomePackageTable,
20 hptInstances, hptRules,
22 ExternalPackageState(..), EpsStats(..), addEpsInStats,
23 PackageTypeEnv, PackageIfaceTable, emptyPackageIfaceTable,
24 lookupIface, lookupIfaceByModule, emptyModIface,
26 InteractiveContext(..), emptyInteractiveContext,
27 icPrintUnqual, unQualInScope,
29 ModIface(..), mkIfaceDepCache, mkIfaceVerCache, mkIfaceFixCache,
32 Deprecs(..), IfaceDeprecs,
34 FixityEnv, FixItem(..), lookupFixity, emptyFixityEnv,
38 TyThing(..), tyThingClass, tyThingTyCon, tyThingDataCon, tyThingId,
39 TypeEnv, lookupType, mkTypeEnv, emptyTypeEnv,
40 extendTypeEnv, extendTypeEnvList, extendTypeEnvWithIds, lookupTypeEnv,
41 typeEnvElts, typeEnvClasses, typeEnvTyCons, typeEnvIds,
43 WhetherHasOrphans, IsBootInterface, Usage(..),
44 Dependencies(..), noDependencies,
45 InstPool, Gated, addInstsToPool,
46 RulePool, addRulesToPool,
47 NameCache(..), OrigNameCache, OrigIParamCache,
48 Avails, availsToNameSet, availName, availNames,
49 GenAvailInfo(..), AvailInfo, RdrAvailInfo,
52 Deprecations, DeprecTxt, lookupDeprec, plusDeprecs,
55 PackageInstEnv, PackageRuleBase,
58 Linkable(..), isObjectLinkable,
59 Unlinked(..), CompiledByteCode,
60 isObject, nameOfObject, isInterpretable, byteCodeOfObject
63 #include "HsVersions.h"
66 import ByteCodeAsm ( CompiledByteCode )
69 import RdrName ( GlobalRdrEnv, emptyGlobalRdrEnv,
70 LocalRdrEnv, emptyLocalRdrEnv,
71 GlobalRdrElt(..), mkRdrUnqual, lookupGRE_RdrName )
72 import Name ( Name, NamedThing, getName, nameOccName, nameModule )
75 import OccName ( OccName, OccEnv, lookupOccEnv, mkOccEnv, emptyOccEnv,
78 import InstEnv ( InstEnv, DFunId )
79 import Rules ( RuleBase )
80 import CoreSyn ( CoreBind )
82 import Type ( TyThing(..) )
84 import Class ( Class, classSelIds, classTyCon )
85 import TyCon ( TyCon, tyConSelIds, tyConDataCons )
86 import DataCon ( dataConImplicitIds )
87 import Packages ( PackageIdH, PackageId )
88 import CmdLineOpts ( DynFlags )
89 import DriverPhases ( HscSource(..), isHsBoot, hscSourceString )
90 import BasicTypes ( Version, initialVersion, IPName,
91 Fixity, defaultFixity, DeprecTxt )
93 import IfaceSyn ( IfaceInst, IfaceRule, IfaceDecl(ifName) )
95 import FiniteMap ( FiniteMap )
96 import CoreSyn ( IdCoreRule )
97 import Maybes ( orElse, fromJust, expectJust )
99 import SrcLoc ( SrcSpan )
100 import UniqSupply ( UniqSupply )
101 import FastString ( FastString )
103 import DATA_IOREF ( IORef, readIORef )
104 import StringBuffer ( StringBuffer )
105 import Time ( ClockTime )
109 %************************************************************************
111 \subsection{Compilation environment}
113 %************************************************************************
115 The HscEnv gives the environment in which to compile a chunk of code.
119 = HscEnv { hsc_mode :: GhciMode,
120 hsc_dflags :: DynFlags,
122 hsc_HPT :: HomePackageTable,
123 -- The home package table describes already-compiled
124 -- home-packge modules, *excluding* the module we
125 -- are compiling right now.
126 -- (In one-shot mode the current module is the only
127 -- home-package module, so hsc_HPT is empty. All other
128 -- modules count as "external-package" modules.
129 -- However, even in GHCi mode, hi-boot interfaces are
130 -- demand-loadeded into the external-package table.)
132 -- hsc_HPT is not mutable because we only demand-load
133 -- external packages; the home package is eagerly
134 -- loaded, module by module, by the compilation manager.
136 -- The HPT may contain modules compiled earlier by --make
137 -- but not actually below the current module in the dependency
138 -- graph. (This changes a previous invariant: changed Jan 05.)
140 -- The next two are side-effected by compiling
141 -- to reflect sucking in interface files
142 hsc_EPS :: IORef ExternalPackageState,
143 hsc_NC :: IORef NameCache }
145 hscEPS :: HscEnv -> IO ExternalPackageState
146 hscEPS hsc_env = readIORef (hsc_EPS hsc_env)
149 The GhciMode is self-explanatory:
152 data GhciMode = Batch -- ghc --make Main
153 | Interactive -- ghc --interactive
154 | OneShot -- ghc Foo.hs
155 | IDE -- Visual Studio etc
158 isOneShot :: GhciMode -> Bool
159 isOneShot OneShot = True
160 isOneShot _other = False
164 type HomePackageTable = ModuleEnv HomeModInfo -- Domain = modules in the home package
165 type PackageIfaceTable = ModuleEnv ModIface -- Domain = modules in the imported packages
167 emptyHomePackageTable = emptyModuleEnv
168 emptyPackageIfaceTable = emptyModuleEnv
171 = HomeModInfo { hm_iface :: ModIface,
172 hm_globals :: Maybe GlobalRdrEnv, -- Its top level environment
173 -- Nothing <-> compiled module
174 hm_details :: ModDetails,
175 hm_linkable :: Linkable }
178 Simple lookups in the symbol table.
181 lookupIface :: HomePackageTable -> PackageIfaceTable -> Module -> Maybe ModIface
182 -- We often have two IfaceTables, and want to do a lookup
183 lookupIface hpt pit mod
184 = case lookupModuleEnv hpt mod of
185 Just mod_info -> Just (hm_iface mod_info)
186 Nothing -> lookupModuleEnv pit mod
188 lookupIfaceByModule :: HomePackageTable -> PackageIfaceTable -> Module -> Maybe ModIface
189 -- We often have two IfaceTables, and want to do a lookup
190 lookupIfaceByModule hpt pit mod
191 = case lookupModuleEnv hpt mod of
192 Just mod_info -> Just (hm_iface mod_info)
193 Nothing -> lookupModuleEnv pit mod
198 hptInstances :: HscEnv -> [(Module, IsBootInterface)] -> [DFunId]
199 -- Find all the instance declarations that are in modules imported
200 -- by this one, directly or indirectly, and are in the Home Package Table
201 -- This ensures that we don't see instances from modules --make compiled
202 -- before this one, but which are not below this one
203 hptInstances hsc_env deps
204 | isOneShot (hsc_mode hsc_env) = [] -- In one-shot mode, the HPT is empty
207 hpt = hsc_HPT hsc_env
210 | -- Find each non-hi-boot module below me
213 -- Look it up in the HPT
214 , let mod_info = ASSERT2( mod `elemModuleEnv` hpt, ppr mod $$ vcat (map ppr_hm (moduleEnvElts hpt)))
215 fromJust (lookupModuleEnv hpt mod)
218 , dfun <- md_insts (hm_details mod_info) ]
220 ppr_hm hm = ppr (mi_module (hm_iface hm))
222 hptRules :: HscEnv -> [(Module, IsBootInterface)] -> [IdCoreRule]
223 -- Get rules from modules "below" this one (in the dependency sense)
224 -- C.f Inst.hptInstances
225 hptRules hsc_env deps
226 | isOneShot (hsc_mode hsc_env) = []
229 hpt = hsc_HPT hsc_env
232 | -- Find each non-hi-boot module below me
235 -- Look it up in the HPT
236 , let mod_info = ASSERT( mod `elemModuleEnv` hpt )
237 fromJust (lookupModuleEnv hpt mod)
240 , rule <- md_rules (hm_details mod_info) ]
244 %************************************************************************
246 \subsection{Symbol tables and Module details}
248 %************************************************************************
250 A @ModIface@ plus a @ModDetails@ summarises everything we know
251 about a compiled module. The @ModIface@ is the stuff *before* linking,
252 and can be written out to an interface file. (The @ModDetails@ is after
253 linking; it is the "linked" form of the mi_decls field.)
255 When we *read* an interface file, we also construct a @ModIface@ from it,
256 except that the mi_decls part is empty; when reading we consolidate
257 the declarations into a single indexed map in the @PersistentRenamerState@.
262 mi_package :: !PackageIdH, -- Which package the module comes from
263 mi_module :: !Module,
264 mi_mod_vers :: !Version, -- Module version: changes when anything changes
266 mi_orphan :: !WhetherHasOrphans, -- Whether this module has orphans
267 mi_boot :: !IsBootInterface, -- Read from an hi-boot file?
269 mi_deps :: Dependencies,
270 -- This is consulted for directly-imported modules,
271 -- but not for anything else (hence lazy)
273 -- Usages; kept sorted so that it's easy to decide
274 -- whether to write a new iface file (changing usages
275 -- doesn't affect the version of this module)
276 mi_usages :: [Usage],
277 -- NOT STRICT! we read this field lazily from the interface file
278 -- It is *only* consulted by the recompilation checker
281 -- Kept sorted by (mod,occ), to make version comparisons easier
282 mi_exports :: ![IfaceExport],
283 mi_exp_vers :: !Version, -- Version number of export list
286 mi_fixities :: [(OccName,Fixity)],
287 -- NOT STRICT! we read this field lazily from the interface file
290 mi_deprecs :: IfaceDeprecs,
291 -- NOT STRICT! we read this field lazily from the interface file
293 -- Type, class and variable declarations
294 -- The version of an Id changes if its fixity or deprecations change
295 -- (as well as its type of course)
296 -- Ditto data constructors, class operations, except that
297 -- the version of the parent class/tycon changes
298 mi_decls :: [(Version,IfaceDecl)], -- Sorted
300 -- Instance declarations and rules
301 mi_insts :: [IfaceInst], -- Sorted
302 mi_rules :: [IfaceRule], -- Sorted
303 mi_rule_vers :: !Version, -- Version number for rules and instances combined
305 -- Cached environments for easy lookup
306 -- These are computed (lazily) from other fields
307 -- and are not put into the interface file
308 mi_dep_fn :: Name -> Maybe DeprecTxt, -- Cached lookup for mi_deprecs
309 mi_fix_fn :: OccName -> Fixity, -- Cached lookup for mi_fixities
310 mi_ver_fn :: OccName -> Maybe Version -- Cached lookup for mi_decls
311 -- The Nothing in mi_ver_fn means that the thing
312 -- isn't in decls. It's useful to know that when
313 -- seeing if we are up to date wrt the old interface
316 -- Should be able to construct ModDetails from mi_decls in ModIface
319 -- The next three fields are created by the typechecker
320 md_types :: !TypeEnv,
321 md_insts :: ![DFunId], -- Dfun-ids for the instances in this module
322 md_rules :: ![IdCoreRule] -- Domain may include Ids from other modules
325 -- A ModGuts is carried through the compiler, accumulating stuff as it goes
326 -- There is only one ModGuts at any time, the one for the module
327 -- being compiled right now. Once it is compiled, a ModIface and
328 -- ModDetails are extracted and the ModGuts is dicarded.
332 mg_module :: !Module,
333 mg_boot :: IsBootInterface, -- Whether it's an hs-boot module
334 mg_exports :: !NameSet, -- What it exports
335 mg_deps :: !Dependencies, -- What is below it, directly or otherwise
336 mg_dir_imps :: ![Module], -- Directly-imported modules; used to
337 -- generate initialisation code
338 mg_usages :: ![Usage], -- Version info for what it needed
340 mg_rdr_env :: !GlobalRdrEnv, -- Top-level lexical environment
341 mg_fix_env :: !FixityEnv, -- Fixity env, for things declared in this module
342 mg_deprecs :: !Deprecations, -- Deprecations declared in the module
344 mg_types :: !TypeEnv,
345 mg_insts :: ![DFunId], -- Instances
346 mg_rules :: ![IdCoreRule], -- Rules from this module
347 mg_binds :: ![CoreBind], -- Bindings for this module
348 mg_foreign :: !ForeignStubs
351 -- The ModGuts takes on several slightly different forms:
353 -- After simplification, the following fields change slightly:
354 -- mg_rules Orphan rules only (local ones now attached to binds)
355 -- mg_binds With rules attached
357 -- After CoreTidy, the following fields change slightly:
358 -- mg_types Now contains Ids as well, replete with final IdInfo
359 -- The Ids are only the ones that are visible from
360 -- importing modules. Without -O that means only
361 -- exported Ids, but with -O importing modules may
362 -- see ids mentioned in unfoldings of exported Ids
364 -- mg_insts Same DFunIds as before, but with final IdInfo,
365 -- and the unique might have changed; remember that
366 -- CoreTidy links up the uniques of old and new versions
368 -- mg_rules All rules for exported things, substituted with final Ids
376 imp_direct :: ![(Module,Bool)], -- Explicitly-imported modules
377 -- Boolean is true if we imported the whole
378 -- module (apart, perhaps, from hiding some)
379 imp_pkg_mods :: !ModuleSet, -- Non-home-package modules on which we depend,
380 -- directly or indirectly
381 imp_home_names :: !NameSet -- Home package things on which we depend,
382 -- directly or indirectly
385 data ForeignStubs = NoStubs
387 SDoc -- Header file prototypes for
388 -- "foreign exported" functions
389 SDoc -- C stubs to use when calling
390 -- "foreign exported" functions
391 [FastString] -- Headers that need to be included
392 -- into C code generated for this module
393 [Id] -- Foreign-exported binders
394 -- we have to generate code to register these
399 emptyModIface :: PackageIdH -> Module -> ModIface
400 emptyModIface pkg mod
401 = ModIface { mi_package = pkg,
403 mi_mod_vers = initialVersion,
406 mi_deps = noDependencies,
409 mi_exp_vers = initialVersion,
411 mi_deprecs = NoDeprecs,
415 mi_rule_vers = initialVersion,
416 mi_dep_fn = emptyIfaceDepCache,
417 mi_fix_fn = emptyIfaceFixCache,
418 mi_ver_fn = emptyIfaceVerCache
423 %************************************************************************
425 \subsection{The interactive context}
427 %************************************************************************
430 data InteractiveContext
431 = InteractiveContext {
432 ic_toplev_scope :: [String], -- Include the "top-level" scope of
435 ic_exports :: [String], -- Include just the exports of these
438 ic_rn_gbl_env :: GlobalRdrEnv, -- The cached GlobalRdrEnv, built from
439 -- ic_toplev_scope and ic_exports
441 ic_rn_local_env :: LocalRdrEnv, -- Lexical context for variables bound
442 -- during interaction
444 ic_type_env :: TypeEnv -- Ditto for types
447 emptyInteractiveContext
448 = InteractiveContext { ic_toplev_scope = [],
450 ic_rn_gbl_env = emptyGlobalRdrEnv,
451 ic_rn_local_env = emptyLocalRdrEnv,
452 ic_type_env = emptyTypeEnv }
454 icPrintUnqual :: InteractiveContext -> PrintUnqualified
455 icPrintUnqual ictxt = unQualInScope (ic_rn_gbl_env ictxt)
458 @unQualInScope@ returns a function that takes a @Name@ and tells whether
459 its unqualified name is in scope. This is put as a boolean flag in
460 the @Name@'s provenance to guide whether or not to print the name qualified
464 unQualInScope :: GlobalRdrEnv -> PrintUnqualified
465 -- True if 'f' is in scope, and has only one binding,
466 -- and the thing it is bound to is the name we are looking for
467 -- (i.e. false if A.f and B.f are both in scope as unqualified 'f')
469 -- [Out of date] Also checks for built-in syntax, which is always 'in scope'
470 unQualInScope env mod occ
471 = case lookupGRE_RdrName (mkRdrUnqual occ) env of
472 [gre] -> nameModule (gre_name gre) == mod
477 %************************************************************************
481 %************************************************************************
484 implicitTyThings :: TyThing -> [TyThing]
485 implicitTyThings (AnId id) = []
487 -- For type constructors, add the data cons (and their extras),
488 -- and the selectors and generic-programming Ids too
490 -- Newtypes don't have a worker Id, so don't generate that?
491 implicitTyThings (ATyCon tc) = map AnId (tyConSelIds tc) ++
492 concatMap (extras_plus . ADataCon) (tyConDataCons tc)
494 -- For classes, add the class TyCon too (and its extras)
495 -- and the class selector Ids
496 implicitTyThings (AClass cl) = map AnId (classSelIds cl) ++
497 extras_plus (ATyCon (classTyCon cl))
500 -- For data cons add the worker and wrapper (if any)
501 implicitTyThings (ADataCon dc) = map AnId (dataConImplicitIds dc)
503 extras_plus thing = thing : implicitTyThings thing
505 extendTypeEnvWithIds :: TypeEnv -> [Id] -> TypeEnv
506 extendTypeEnvWithIds env ids
507 = extendNameEnvList env [(getName id, AnId id) | id <- ids]
510 %************************************************************************
514 %************************************************************************
517 type TypeEnv = NameEnv TyThing
519 emptyTypeEnv :: TypeEnv
520 typeEnvElts :: TypeEnv -> [TyThing]
521 typeEnvClasses :: TypeEnv -> [Class]
522 typeEnvTyCons :: TypeEnv -> [TyCon]
523 typeEnvIds :: TypeEnv -> [Id]
524 lookupTypeEnv :: TypeEnv -> Name -> Maybe TyThing
526 emptyTypeEnv = emptyNameEnv
527 typeEnvElts env = nameEnvElts env
528 typeEnvClasses env = [cl | AClass cl <- typeEnvElts env]
529 typeEnvTyCons env = [tc | ATyCon tc <- typeEnvElts env]
530 typeEnvIds env = [id | AnId id <- typeEnvElts env]
532 mkTypeEnv :: [TyThing] -> TypeEnv
533 mkTypeEnv things = extendTypeEnvList emptyTypeEnv things
535 lookupTypeEnv = lookupNameEnv
537 -- Extend the type environment
538 extendTypeEnv :: TypeEnv -> TyThing -> TypeEnv
539 extendTypeEnv env thing = extendNameEnv env (getName thing) thing
541 extendTypeEnvList :: TypeEnv -> [TyThing] -> TypeEnv
542 extendTypeEnvList env things = foldl extendTypeEnv env things
546 lookupType :: HomePackageTable -> PackageTypeEnv -> Name -> Maybe TyThing
547 lookupType hpt pte name
548 = case lookupModuleEnv hpt (nameModule name) of
549 Just details -> lookupNameEnv (md_types (hm_details details)) name
550 Nothing -> lookupNameEnv pte name
555 tyThingTyCon (ATyCon tc) = tc
556 tyThingTyCon other = pprPanic "tyThingTyCon" (ppr other)
558 tyThingClass (AClass cls) = cls
559 tyThingClass other = pprPanic "tyThingClass" (ppr other)
561 tyThingDataCon (ADataCon dc) = dc
562 tyThingDataCon other = pprPanic "tyThingDataCon" (ppr other)
564 tyThingId (AnId id) = id
565 tyThingId other = pprPanic "tyThingId" (ppr other)
568 %************************************************************************
570 \subsection{Auxiliary types}
572 %************************************************************************
574 These types are defined here because they are mentioned in ModDetails,
575 but they are mostly elaborated elsewhere
578 mkIfaceVerCache :: [(Version,IfaceDecl)] -> OccName -> Maybe Version
579 mkIfaceVerCache pairs
580 = \occ -> lookupOccEnv env occ
582 env = foldl add emptyOccEnv pairs
583 add env (v,d) = extendOccEnv env (ifName d) v
585 emptyIfaceVerCache :: OccName -> Maybe Version
586 emptyIfaceVerCache occ = Nothing
588 ------------------ Deprecations -------------------------
591 | DeprecAll DeprecTxt -- Whole module deprecated
592 | DeprecSome a -- Some specific things deprecated
595 type IfaceDeprecs = Deprecs [(OccName,DeprecTxt)]
596 type Deprecations = Deprecs (NameEnv (OccName,DeprecTxt))
598 mkIfaceDepCache:: IfaceDeprecs -> Name -> Maybe DeprecTxt
599 mkIfaceDepCache NoDeprecs = \n -> Nothing
600 mkIfaceDepCache (DeprecAll t) = \n -> Just t
601 mkIfaceDepCache (DeprecSome pairs) = lookupOccEnv (mkOccEnv pairs) . nameOccName
603 emptyIfaceDepCache :: Name -> Maybe DeprecTxt
604 emptyIfaceDepCache n = Nothing
606 lookupDeprec :: Deprecations -> Name -> Maybe DeprecTxt
607 lookupDeprec NoDeprecs name = Nothing
608 lookupDeprec (DeprecAll txt) name = Just txt
609 lookupDeprec (DeprecSome env) name = case lookupNameEnv env name of
610 Just (_, txt) -> Just txt
613 plusDeprecs :: Deprecations -> Deprecations -> Deprecations
614 plusDeprecs d NoDeprecs = d
615 plusDeprecs NoDeprecs d = d
616 plusDeprecs d (DeprecAll t) = DeprecAll t
617 plusDeprecs (DeprecAll t) d = DeprecAll t
618 plusDeprecs (DeprecSome v1) (DeprecSome v2) = DeprecSome (v1 `plusNameEnv` v2)
623 type Avails = [AvailInfo]
624 type AvailInfo = GenAvailInfo Name
625 type RdrAvailInfo = GenAvailInfo OccName
627 data GenAvailInfo name = Avail name -- An ordinary identifier
628 | AvailTC name -- The name of the type or class
629 [name] -- The available pieces of type/class.
630 -- NB: If the type or class is itself
631 -- to be in scope, it must be in this list.
632 -- Thus, typically: AvailTC Eq [Eq, ==, /=]
634 -- Equality used when deciding if the interface has changed
636 type IfaceExport = (Module, [GenAvailInfo OccName])
638 availsToNameSet :: [AvailInfo] -> NameSet
639 availsToNameSet avails = foldl add emptyNameSet avails
641 add set avail = addListToNameSet set (availNames avail)
643 availName :: GenAvailInfo name -> name
644 availName (Avail n) = n
645 availName (AvailTC n _) = n
647 availNames :: GenAvailInfo name -> [name]
648 availNames (Avail n) = [n]
649 availNames (AvailTC n ns) = ns
651 instance Outputable n => Outputable (GenAvailInfo n) where
654 pprAvail :: Outputable n => GenAvailInfo n -> SDoc
655 pprAvail (AvailTC n ns) = ppr n <> case {- filter (/= n) -} ns of
657 ns' -> braces (hsep (punctuate comma (map ppr ns')))
659 pprAvail (Avail n) = ppr n
663 mkIfaceFixCache :: [(OccName, Fixity)] -> OccName -> Fixity
664 mkIfaceFixCache pairs
665 = \n -> lookupOccEnv env n `orElse` defaultFixity
669 emptyIfaceFixCache :: OccName -> Fixity
670 emptyIfaceFixCache n = defaultFixity
672 -- This fixity environment is for source code only
673 type FixityEnv = NameEnv FixItem
675 -- We keep the OccName in the range so that we can generate an interface from it
676 data FixItem = FixItem OccName Fixity SrcSpan
678 instance Outputable FixItem where
679 ppr (FixItem occ fix loc) = ppr fix <+> ppr occ <+> parens (ppr loc)
681 emptyFixityEnv :: FixityEnv
682 emptyFixityEnv = emptyNameEnv
684 lookupFixity :: FixityEnv -> Name -> Fixity
685 lookupFixity env n = case lookupNameEnv env n of
686 Just (FixItem _ fix _) -> fix
687 Nothing -> defaultFixity
691 %************************************************************************
693 \subsection{WhatsImported}
695 %************************************************************************
698 type WhetherHasOrphans = Bool
700 -- * an instance decl in a module other than the defn module for
701 -- one of the tycons or classes in the instance head
702 -- * a transformation rule in a module other than the one defining
703 -- the function in the head of the rule.
705 type IsBootInterface = Bool
707 -- Dependency info about modules and packages below this one
708 -- in the import hierarchy. See TcRnTypes.ImportAvails for details.
710 -- Invariant: the dependencies of a module M never includes M
711 -- Invariant: the lists are unordered, with no duplicates
713 = Deps { dep_mods :: [(Module,IsBootInterface)], -- Home-package module dependencies
714 dep_pkgs :: [PackageId], -- External package dependencies
715 dep_orphs :: [Module] } -- Orphan modules (whether home or external pkg)
717 -- Equality used only for old/new comparison in MkIface.addVersionInfo
719 noDependencies :: Dependencies
720 noDependencies = Deps [] [] []
723 = Usage { usg_name :: Module, -- Name of the module
724 usg_mod :: Version, -- Module version
725 usg_entities :: [(OccName,Version)], -- Sorted by occurrence name
726 usg_exports :: Maybe Version, -- Export-list version, if we depend on it
727 usg_rules :: Version -- Orphan-rules version (for non-orphan
728 -- modules this will always be initialVersion)
730 -- This type doesn't let you say "I imported f but none of the rules in
731 -- the module". If you use anything in the module you get its rule version
732 -- So if the rules change, you'll recompile, even if you don't use them.
733 -- This is easy to implement, and it's safer: you might not have used the rules last
734 -- time round, but if someone has added a new rule you might need it this time
736 -- The export list field is (Just v) if we depend on the export list:
737 -- i.e. we imported the module without saying exactly what we imported
738 -- We need to recompile if the module exports changes, because we might
739 -- now have a name clash in the importing module.
743 %************************************************************************
745 The External Package State
747 %************************************************************************
750 type PackageTypeEnv = TypeEnv
751 type PackageRuleBase = RuleBase
752 type PackageInstEnv = InstEnv
754 data ExternalPackageState
756 eps_is_boot :: !(ModuleEnv (Module, IsBootInterface)),
757 -- In OneShot mode (only), home-package modules accumulate in the
758 -- external package state, and are sucked in lazily.
759 -- For these home-pkg modules (only) we need to record which are
760 -- boot modules. We set this field after loading all the
761 -- explicitly-imported interfaces, but before doing anything else
763 -- The Module part is not necessary, but it's useful for
764 -- debug prints, and it's convenient because this field comes
765 -- direct from TcRnTypes.ImportAvails.imp_dep_mods
767 eps_PIT :: !PackageIfaceTable,
768 -- The ModuleIFaces for modules in external packages
769 -- whose interfaces we have opened
770 -- The declarations in these interface files are held in
771 -- eps_decls, eps_insts, eps_rules (below), not in the
772 -- mi_decls fields of the iPIT.
773 -- What _is_ in the iPIT is:
780 eps_PTE :: !PackageTypeEnv, -- Domain = external-package modules
782 eps_inst_env :: !PackageInstEnv, -- The total InstEnv accumulated from
783 -- all the external-package modules
784 eps_rule_base :: !PackageRuleBase, -- Ditto RuleEnv
787 -- Holding pens for stuff that has been read in from file,
788 -- but not yet slurped into the renamer
789 eps_insts :: !InstPool,
790 -- The as-yet un-slurped instance decls
791 -- Decls move from here to eps_inst_env
792 -- Each instance is 'gated' by the names that must be
793 -- available before this instance decl is needed.
795 eps_rules :: !RulePool,
796 -- The as-yet un-slurped rules
798 eps_stats :: !EpsStats
801 -- "In" means read from iface files
802 -- "Out" means actually sucked in and type-checked
803 data EpsStats = EpsStats { n_ifaces_in
804 , n_decls_in, n_decls_out
805 , n_rules_in, n_rules_out
806 , n_insts_in, n_insts_out :: !Int }
809 The NameCache makes sure that there is just one Unique assigned for
810 each original name; i.e. (module-name, occ-name) pair. The Name is
811 always stored as a Global, and has the SrcLoc of its binding location.
812 Actually that's not quite right. When we first encounter the original
813 name, we might not be at its binding site (e.g. we are reading an
814 interface file); so we give it 'noSrcLoc' then. Later, when we find
815 its binding site, we fix it up.
817 Exactly the same is true of the Module stored in the Name. When we first
818 encounter the occurrence, we may not know the details of the module, so
819 we just store junk. Then when we find the binding site, we fix it up.
823 = NameCache { nsUniqs :: UniqSupply,
825 nsNames :: OrigNameCache,
826 -- Ensures that one original name gets one unique
827 nsIPs :: OrigIParamCache
828 -- Ensures that one implicit parameter name gets one unique
831 type OrigNameCache = ModuleEnv (OccEnv Name)
832 type OrigIParamCache = FiniteMap (IPName OccName) (IPName Name)
836 type Gated d = ([Name], (Module, SDoc, d))
837 -- The [Name] 'gate' the declaration; always non-empty
838 -- Module records which module this decl belongs to
839 -- SDoc records the pathname of the file, or similar err-ctxt info
841 type RulePool = [Gated IfaceRule]
843 addRulesToPool :: RulePool
846 addRulesToPool rules new_rules = new_rules ++ rules
848 -------------------------
849 addEpsInStats :: EpsStats -> Int -> Int -> Int -> EpsStats
850 -- Add stats for one newly-read interface
851 addEpsInStats stats n_decls n_insts n_rules
852 = stats { n_ifaces_in = n_ifaces_in stats + 1
853 , n_decls_in = n_decls_in stats + n_decls
854 , n_insts_in = n_insts_in stats + n_insts
855 , n_rules_in = n_rules_in stats + n_rules }
857 -------------------------
858 type InstPool = NameEnv [Gated IfaceInst]
859 -- The key of the Pool is the Class
860 -- The Names are the TyCons in the instance head
861 -- For example, suppose this is in an interface file
862 -- instance C T where ...
863 -- We want to slurp this decl if both C and T are "visible" in
864 -- the importing module. See "The gating story" in RnIfaces for details.
867 addInstsToPool :: InstPool -> [(Name, Gated IfaceInst)] -> InstPool
868 addInstsToPool insts new_insts
869 = foldr add insts new_insts
871 add :: (Name, Gated IfaceInst) -> NameEnv [Gated IfaceInst] -> NameEnv [Gated IfaceInst]
872 add (cls,new_inst) insts = extendNameEnv_C combine insts cls [new_inst]
874 combine old_insts _ = new_inst : old_insts
878 %************************************************************************
881 A ModSummary is a node in the compilation manager's
882 dependency graph, and it's also passed to hscMain
884 %************************************************************************
886 The nodes of the module graph are
887 EITHER a regular Haskell source module
888 OR a hi-boot source module
893 ms_mod :: Module, -- Name of the module
894 ms_hsc_src :: HscSource, -- Source is Haskell, hs-boot, external core
895 ms_location :: ModLocation, -- Location
896 ms_hs_date :: ClockTime, -- Timestamp of summarised file
897 ms_srcimps :: [Module], -- Source imports
898 ms_imps :: [Module], -- Non-source imports
899 ms_hspp_file :: Maybe FilePath, -- Filename of preprocessed source,
900 -- once we have preprocessed it.
901 ms_hspp_buf :: Maybe StringBuffer -- The actual preprocessed source, maybe.
904 -- The ModLocation contains both the original source filename and the
905 -- filename of the cleaned-up source file after all preprocessing has been
906 -- done. The point is that the summariser will have to cpp/unlit/whatever
907 -- all files anyway, and there's no point in doing this twice -- just
908 -- park the result in a temp file, put the name of it in the location,
909 -- and let @compile@ read from that file on the way back up.
911 -- The ModLocation is stable over successive up-sweeps in GHCi, wheres
912 -- the ms_hs_date and imports can, of course, change
914 msHsFilePath, msHiFilePath, msObjFilePath :: ModSummary -> FilePath
915 msHsFilePath ms = expectJust "msHsFilePath" (ml_hs_file (ms_location ms))
916 msHiFilePath ms = ml_hi_file (ms_location ms)
917 msObjFilePath ms = ml_obj_file (ms_location ms)
920 instance Outputable ModSummary where
922 = sep [text "ModSummary {",
923 nest 3 (sep [text "ms_hs_date = " <> text (show (ms_hs_date ms)),
924 text "ms_mod =" <+> ppr (ms_mod ms)
925 <> text (hscSourceString (ms_hsc_src ms)) <> comma,
926 text "ms_imps =" <+> ppr (ms_imps ms),
927 text "ms_srcimps =" <+> ppr (ms_srcimps ms)]),
931 showModMsg :: Bool -> ModSummary -> String
932 showModMsg use_object mod_summary
933 = showSDoc (hsep [text (mod_str ++ replicate (max 0 (16 - length mod_str)) ' '),
934 char '(', text (msHsFilePath mod_summary) <> comma,
935 if use_object then text (msObjFilePath mod_summary)
936 else text "interpreted",
939 mod = ms_mod mod_summary
940 mod_str = moduleUserString mod ++ hscSourceString (ms_hsc_src mod_summary)
944 %************************************************************************
946 \subsection{Linkable stuff}
948 %************************************************************************
950 This stuff is in here, rather than (say) in Linker.lhs, because the Linker.lhs
951 stuff is the *dynamic* linker, and isn't present in a stage-1 compiler
955 linkableTime :: ClockTime, -- Time at which this linkable was built
956 -- (i.e. when the bytecodes were produced,
957 -- or the mod date on the files)
958 linkableModule :: Module, -- Should be Module, but see below
959 linkableUnlinked :: [Unlinked]
962 isObjectLinkable :: Linkable -> Bool
963 isObjectLinkable l = all isObject (linkableUnlinked l)
965 instance Outputable Linkable where
966 ppr (LM when_made mod unlinkeds)
967 = (text "LinkableM" <+> parens (text (show when_made)) <+> ppr mod)
968 $$ nest 3 (ppr unlinkeds)
970 -------------------------------------------
975 | BCOs CompiledByteCode
978 data CompiledByteCode = NoByteCode
981 instance Outputable Unlinked where
982 ppr (DotO path) = text "DotO" <+> text path
983 ppr (DotA path) = text "DotA" <+> text path
984 ppr (DotDLL path) = text "DotDLL" <+> text path
986 ppr (BCOs bcos) = text "BCOs" <+> ppr bcos
988 ppr (BCOs bcos) = text "No byte code"
991 isObject (DotO _) = True
992 isObject (DotA _) = True
993 isObject (DotDLL _) = True
996 isInterpretable = not . isObject
998 nameOfObject (DotO fn) = fn
999 nameOfObject (DotA fn) = fn
1000 nameOfObject (DotDLL fn) = fn
1002 byteCodeOfObject (BCOs bc) = bc