2 % (c) The University of Glasgow, 2006
4 \section[HscTypes]{Types for the per-module compiler}
8 -- * Sessions and compilation state
9 Session(..), withSession, modifySession,
11 FinderCache, FindResult(..), ModLocationCache,
12 Target(..), TargetId(..), pprTarget, pprTargetId,
15 ModDetails(..), emptyModDetails,
16 ModGuts(..), CgGuts(..), ModImports(..), ForeignStubs(..),
18 ModSummary(..), ms_mod_name, showModMsg, isBootSummary,
19 msHsFilePath, msHiFilePath, msObjFilePath,
21 HscSource(..), isHsBoot, hscSourceString, -- Re-exported from DriverPhases
23 HomePackageTable, HomeModInfo(..), emptyHomePackageTable,
24 hptInstances, hptRules,
26 ExternalPackageState(..), EpsStats(..), addEpsInStats,
27 PackageTypeEnv, PackageIfaceTable, emptyPackageIfaceTable,
28 lookupIfaceByModule, emptyModIface,
30 InteractiveContext(..), emptyInteractiveContext,
31 icPrintUnqual, mkPrintUnqualified, extendInteractiveContext,
33 ModIface(..), mkIfaceDepCache, mkIfaceVerCache, mkIfaceFixCache,
36 Deprecs(..), IfaceDeprecs,
38 FixityEnv, FixItem(..), lookupFixity, emptyFixityEnv,
40 implicitTyThings, isImplicitTyThing,
42 TyThing(..), tyThingClass, tyThingTyCon, tyThingDataCon, tyThingId,
43 TypeEnv, lookupType, mkTypeEnv, emptyTypeEnv,
44 extendTypeEnv, extendTypeEnvList, extendTypeEnvWithIds, lookupTypeEnv,
45 typeEnvElts, typeEnvClasses, typeEnvTyCons, typeEnvIds,
48 WhetherHasOrphans, IsBootInterface, Usage(..),
49 Dependencies(..), noDependencies,
50 NameCache(..), OrigNameCache, OrigIParamCache,
51 Avails, availsToNameSet, availsToNameEnv, availName, availNames,
52 GenAvailInfo(..), AvailInfo, RdrAvailInfo,
55 Deprecations, DeprecTxt, plusDeprecs,
57 PackageInstEnv, PackageRuleBase,
60 Linkable(..), isObjectLinkable,
61 Unlinked(..), CompiledByteCode,
62 isObject, nameOfObject, isInterpretable, byteCodeOfObject,
63 HpcInfo(..), noHpcInfo,
66 ModBreaks (..), BreakIndex, emptyModBreaks
69 #include "HsVersions.h"
72 import ByteCodeAsm ( CompiledByteCode )
73 import {-# SOURCE #-} InteractiveEval ( Resume )
76 import RdrName ( GlobalRdrEnv, emptyGlobalRdrEnv,
77 LocalRdrEnv, emptyLocalRdrEnv, GlobalRdrElt(..),
78 unQualOK, ImpDeclSpec(..), Provenance(..),
79 ImportSpec(..), lookupGlobalRdrEnv )
80 import Name ( Name, NamedThing, getName, nameOccName, nameModule )
83 import OccName ( OccName, OccEnv, lookupOccEnv, mkOccEnv, emptyOccEnv,
86 import InstEnv ( InstEnv, Instance )
87 import FamInstEnv ( FamInstEnv, FamInst )
88 import Rules ( RuleBase )
89 import CoreSyn ( CoreBind )
92 import Type ( TyThing(..) )
94 import Class ( Class, classSelIds, classATs, classTyCon )
96 import DataCon ( DataCon, dataConImplicitIds )
97 import PrelNames ( gHC_PRIM )
98 import Packages ( PackageId )
99 import DynFlags ( DynFlags(..), DynFlag(..), isOneShot, HscTarget (..) )
100 import DriverPhases ( HscSource(..), isHsBoot, hscSourceString, Phase )
101 import BasicTypes ( Version, initialVersion, IPName,
102 Fixity, defaultFixity, DeprecTxt )
104 import FiniteMap ( FiniteMap )
105 import CoreSyn ( CoreRule )
106 import Maybes ( orElse, expectJust, catMaybes, seqMaybe )
109 import SrcLoc ( SrcSpan, Located )
110 import UniqFM ( lookupUFM, eltsUFM, emptyUFM )
111 import UniqSupply ( UniqSupply )
112 import FastString ( FastString )
114 import StringBuffer ( StringBuffer )
116 import System.Time ( ClockTime )
118 import Data.Array ( Array, array )
122 %************************************************************************
124 \subsection{Compilation environment}
126 %************************************************************************
130 -- | The Session is a handle to the complete state of a compilation
131 -- session. A compilation session consists of a set of modules
132 -- constituting the current program or library, the context for
133 -- interactive evaluation, and various caches.
134 newtype Session = Session (IORef HscEnv)
136 withSession :: Session -> (HscEnv -> IO a) -> IO a
137 withSession (Session ref) f = do h <- readIORef ref; f h
139 modifySession :: Session -> (HscEnv -> HscEnv) -> IO ()
140 modifySession (Session ref) f = do h <- readIORef ref; writeIORef ref $! f h
143 HscEnv is like Session, except that some of the fields are immutable.
144 An HscEnv is used to compile a single module from plain Haskell source
145 code (after preprocessing) to either C, assembly or C--. Things like
146 the module graph don't change during a single compilation.
148 Historical note: "hsc" used to be the name of the compiler binary,
149 when there was a separate driver and compiler. To compile a single
150 module, the driver would invoke hsc on the source code... so nowadays
151 we think of hsc as the layer of the compiler that deals with compiling
157 hsc_dflags :: DynFlags,
158 -- The dynamic flag settings
160 hsc_targets :: [Target],
161 -- The targets (or roots) of the current session
163 hsc_mod_graph :: ModuleGraph,
164 -- The module graph of the current session
166 hsc_IC :: InteractiveContext,
167 -- The context for evaluating interactive statements
169 hsc_HPT :: HomePackageTable,
170 -- The home package table describes already-compiled
171 -- home-packge modules, *excluding* the module we
172 -- are compiling right now.
173 -- (In one-shot mode the current module is the only
174 -- home-package module, so hsc_HPT is empty. All other
175 -- modules count as "external-package" modules.
176 -- However, even in GHCi mode, hi-boot interfaces are
177 -- demand-loadeded into the external-package table.)
179 -- hsc_HPT is not mutable because we only demand-load
180 -- external packages; the home package is eagerly
181 -- loaded, module by module, by the compilation manager.
183 -- The HPT may contain modules compiled earlier by --make
184 -- but not actually below the current module in the dependency
185 -- graph. (This changes a previous invariant: changed Jan 05.)
187 hsc_EPS :: {-# UNPACK #-} !(IORef ExternalPackageState),
188 hsc_NC :: {-# UNPACK #-} !(IORef NameCache),
189 -- These are side-effected by compiling to reflect
190 -- sucking in interface files. They cache the state of
191 -- external interface files, in effect.
193 hsc_FC :: {-# UNPACK #-} !(IORef FinderCache),
194 hsc_MLC :: {-# UNPACK #-} !(IORef ModLocationCache),
195 -- The finder's cache. This caches the location of modules,
196 -- so we don't have to search the filesystem multiple times.
198 hsc_global_rdr_env :: GlobalRdrEnv,
199 hsc_global_type_env :: TypeEnv
202 hscEPS :: HscEnv -> IO ExternalPackageState
203 hscEPS hsc_env = readIORef (hsc_EPS hsc_env)
205 -- | A compilation target.
207 -- A target may be supplied with the actual text of the
208 -- module. If so, use this instead of the file contents (this
209 -- is for use in an IDE where the file hasn't been saved by
211 data Target = Target TargetId (Maybe (StringBuffer,ClockTime))
214 = TargetModule ModuleName
215 -- ^ A module name: search for the file
216 | TargetFile FilePath (Maybe Phase)
217 -- ^ A filename: preprocess & parse it to find the module name.
218 -- If specified, the Phase indicates how to compile this file
219 -- (which phase to start from). Nothing indicates the starting phase
220 -- should be determined from the suffix of the filename.
223 pprTarget :: Target -> SDoc
224 pprTarget (Target id _) = pprTargetId id
226 instance Outputable Target where
229 pprTargetId (TargetModule m) = ppr m
230 pprTargetId (TargetFile f _) = text f
232 instance Outputable TargetId where
235 type HomePackageTable = ModuleNameEnv HomeModInfo
236 -- Domain = modules in the home package
237 -- "home" package name cached here for convenience
238 type PackageIfaceTable = ModuleEnv ModIface
239 -- Domain = modules in the imported packages
241 emptyHomePackageTable = emptyUFM
242 emptyPackageIfaceTable = emptyModuleEnv
245 = HomeModInfo { hm_iface :: !ModIface,
246 hm_details :: !ModDetails,
247 hm_linkable :: !(Maybe Linkable) }
248 -- hm_linkable might be Nothing if:
249 -- a) this is an .hs-boot module
250 -- b) temporarily during compilation if we pruned away
251 -- the old linkable because it was out of date.
252 -- after a complete compilation (GHC.load), all hm_linkable
253 -- fields in the HPT will be Just.
255 -- When re-linking a module (hscNoRecomp), we construct
256 -- the HomModInfo by building a new ModDetails from the
257 -- old ModIface (only).
259 -- | Find the 'ModIface' for a 'Module'
266 lookupIfaceByModule dflags hpt pit mod
267 | modulePackageId mod == thisPackage dflags
268 = -- The module comes from the home package, so look first
269 -- in the HPT. If it's not from the home package it's wrong to look
270 -- in the HPT, because the HPT is indexed by *ModuleName* not Module
271 fmap hm_iface (lookupUFM hpt (moduleName mod))
272 `seqMaybe` lookupModuleEnv pit mod
274 | otherwise = lookupModuleEnv pit mod -- Look in PIT only
276 -- If the module does come from the home package, why do we look in the PIT as well?
277 -- (a) In OneShot mode, even home-package modules accumulate in the PIT
278 -- (b) Even in Batch (--make) mode, there is *one* case where a home-package
279 -- module is in the PIT, namely GHC.Prim when compiling the base package.
280 -- We could eliminate (b) if we wanted, by making GHC.Prim belong to a packake
281 -- of its own, but it doesn't seem worth the bother.
286 hptInstances :: HscEnv -> (ModuleName -> Bool) -> [Instance]
287 -- Find all the instance declarations that are in modules imported
288 -- by this one, directly or indirectly, and are in the Home Package Table
289 -- This ensures that we don't see instances from modules --make compiled
290 -- before this one, but which are not below this one
291 hptInstances hsc_env want_this_module
293 | mod_info <- eltsUFM (hsc_HPT hsc_env)
294 , want_this_module (moduleName (mi_module (hm_iface mod_info)))
295 , ispec <- md_insts (hm_details mod_info) ]
297 hptRules :: HscEnv -> [(ModuleName, IsBootInterface)] -> [CoreRule]
298 -- Get rules from modules "below" this one (in the dependency sense)
299 -- C.f Inst.hptInstances
300 hptRules hsc_env deps
301 | isOneShot (ghcMode (hsc_dflags hsc_env)) = []
304 hpt = hsc_HPT hsc_env
307 | -- Find each non-hi-boot module below me
310 -- unsavoury: when compiling the base package with --make, we
311 -- sometimes try to look up RULES for GHC.Prim. GHC.Prim won't
312 -- be in the HPT, because we never compile it; it's in the EPT
313 -- instead. ToDo: clean up, and remove this slightly bogus
315 , mod /= moduleName gHC_PRIM
317 -- Look it up in the HPT
318 , let rules = case lookupUFM hpt mod of
319 Just info -> md_rules (hm_details info)
320 Nothing -> pprTrace "WARNING in hptRules" msg []
321 msg = vcat [ptext SLIT("missing module") <+> ppr mod,
322 ptext SLIT("Probable cause: out-of-date interface files")]
323 -- This really shouldn't happen, but see Trac #962
329 %************************************************************************
331 \subsection{The Finder cache}
333 %************************************************************************
336 -- | The 'FinderCache' maps home module names to the result of
337 -- searching for that module. It records the results of searching for
338 -- modules along the search path. On @:load@, we flush the entire
339 -- contents of this cache.
341 -- Although the @FinderCache@ range is 'FindResult' for convenience ,
342 -- in fact it will only ever contain 'Found' or 'NotFound' entries.
344 type FinderCache = ModuleNameEnv FindResult
346 -- | The result of searching for an imported module.
348 = Found ModLocation Module
349 -- the module was found
350 | NoPackage PackageId
351 -- the requested package was not found
352 | FoundMultiple [PackageId]
353 -- *error*: both in multiple packages
354 | PackageHidden PackageId
355 -- for an explicit source import: the package containing the module is
357 | ModuleHidden PackageId
358 -- for an explicit source import: the package containing the module is
359 -- exposed, but the module itself is hidden.
360 | NotFound [FilePath] (Maybe PackageId)
361 -- the module was not found, the specified places were searched
362 | NotFoundInPackage PackageId
363 -- the module was not found in this package
365 -- | Cache that remembers where we found a particular module. Contains both
366 -- home modules and package modules. On @:load@, only home modules are
367 -- purged from this cache.
368 type ModLocationCache = ModuleEnv ModLocation
371 %************************************************************************
373 \subsection{Symbol tables and Module details}
375 %************************************************************************
377 A @ModIface@ plus a @ModDetails@ summarises everything we know
378 about a compiled module. The @ModIface@ is the stuff *before* linking,
379 and can be written out to an interface file. (The @ModDetails@ is after
380 linking; it is the "linked" form of the mi_decls field.)
382 When we *read* an interface file, we also construct a @ModIface@ from it,
383 except that the mi_decls part is empty; when reading we consolidate
384 the declarations into a single indexed map in the @PersistentRenamerState@.
389 mi_module :: !Module,
390 mi_mod_vers :: !Version, -- Module version: changes when anything changes
392 mi_orphan :: !WhetherHasOrphans, -- Whether this module has orphans
393 mi_finsts :: !WhetherHasFamInst, -- Whether module has family insts
394 mi_boot :: !IsBootInterface, -- Read from an hi-boot file?
396 mi_deps :: Dependencies,
397 -- This is consulted for directly-imported modules,
398 -- but not for anything else (hence lazy)
400 -- Usages; kept sorted so that it's easy to decide
401 -- whether to write a new iface file (changing usages
402 -- doesn't affect the version of this module)
403 mi_usages :: [Usage],
404 -- NOT STRICT! we read this field lazily from the interface file
405 -- It is *only* consulted by the recompilation checker
408 -- Kept sorted by (mod,occ), to make version comparisons easier
409 mi_exports :: ![IfaceExport],
410 mi_exp_vers :: !Version, -- Version number of export list
413 mi_fixities :: [(OccName,Fixity)],
414 -- NOT STRICT! we read this field lazily from the interface file
417 mi_deprecs :: IfaceDeprecs,
418 -- NOT STRICT! we read this field lazily from the interface file
420 -- Type, class and variable declarations
421 -- The version of an Id changes if its fixity or deprecations change
422 -- (as well as its type of course)
423 -- Ditto data constructors, class operations, except that
424 -- the version of the parent class/tycon changes
425 mi_decls :: [(Version,IfaceDecl)], -- Sorted
427 mi_globals :: !(Maybe GlobalRdrEnv),
428 -- Binds all the things defined at the top level in
429 -- the *original source* code for this module. which
430 -- is NOT the same as mi_exports, nor mi_decls (which
431 -- may contains declarations for things not actually
432 -- defined by the user). Used for GHCi and for inspecting
433 -- the contents of modules via the GHC API only.
435 -- (We need the source file to figure out the
436 -- top-level environment, if we didn't compile this module
437 -- from source then this field contains Nothing).
439 -- Strictly speaking this field should live in the
440 -- HomeModInfo, but that leads to more plumbing.
442 -- Instance declarations and rules
443 mi_insts :: [IfaceInst], -- Sorted
444 mi_fam_insts :: [IfaceFamInst], -- Sorted
445 mi_rules :: [IfaceRule], -- Sorted
446 mi_rule_vers :: !Version, -- Version number for rules and
447 -- instances (for classes and families)
450 -- Cached environments for easy lookup
451 -- These are computed (lazily) from other fields
452 -- and are not put into the interface file
453 mi_dep_fn :: Name -> Maybe DeprecTxt, -- Cached lookup for mi_deprecs
454 mi_fix_fn :: OccName -> Fixity, -- Cached lookup for mi_fixities
455 mi_ver_fn :: OccName -> Maybe (OccName, Version)
456 -- Cached lookup for mi_decls
457 -- The Nothing in mi_ver_fn means that the thing
458 -- isn't in decls. It's useful to know that when
459 -- seeing if we are up to date wrt the old interface
460 -- The 'OccName' is the parent of the name, if it has one.
463 -- Should be able to construct ModDetails from mi_decls in ModIface
466 -- The next two fields are created by the typechecker
467 md_exports :: [AvailInfo],
468 md_types :: !TypeEnv,
469 md_insts :: ![Instance], -- Dfun-ids for the instances in this module
470 md_fam_insts :: ![FamInst],
471 md_rules :: ![CoreRule], -- Domain may include Ids from other modules
472 md_modBreaks :: !ModBreaks -- breakpoint information for this module
475 emptyModDetails = ModDetails { md_types = emptyTypeEnv,
480 md_modBreaks = emptyModBreaks }
482 -- A ModGuts is carried through the compiler, accumulating stuff as it goes
483 -- There is only one ModGuts at any time, the one for the module
484 -- being compiled right now. Once it is compiled, a ModIface and
485 -- ModDetails are extracted and the ModGuts is dicarded.
489 mg_module :: !Module,
490 mg_boot :: IsBootInterface, -- Whether it's an hs-boot module
491 mg_exports :: ![AvailInfo], -- What it exports
492 mg_deps :: !Dependencies, -- What is below it, directly or
494 mg_dir_imps :: ![Module], -- Directly-imported modules; used to
495 -- generate initialisation code
496 mg_usages :: ![Usage], -- Version info for what it needed
498 mg_rdr_env :: !GlobalRdrEnv, -- Top-level lexical environment
499 mg_fix_env :: !FixityEnv, -- Fixity env, for things declared in
502 mg_fam_inst_env :: FamInstEnv, -- Type-family instance enviroment
503 -- for *home-package* modules (including
504 -- this one). c.f. tcg_fam_inst_env
506 mg_types :: !TypeEnv,
507 mg_insts :: ![Instance], -- Instances
508 mg_fam_insts :: ![FamInst], -- Instances
509 mg_rules :: ![CoreRule], -- Rules from this module
510 mg_binds :: ![CoreBind], -- Bindings for this module
511 mg_foreign :: !ForeignStubs,
512 mg_deprecs :: !Deprecations, -- Deprecations declared in the module
513 mg_hpc_info :: !HpcInfo, -- info about coverage tick boxes
514 mg_modBreaks :: !ModBreaks
517 -- The ModGuts takes on several slightly different forms:
519 -- After simplification, the following fields change slightly:
520 -- mg_rules Orphan rules only (local ones now attached to binds)
521 -- mg_binds With rules attached
524 ---------------------------------------------------------
525 -- The Tidy pass forks the information about this module:
526 -- * one lot goes to interface file generation (ModIface)
527 -- and later compilations (ModDetails)
528 -- * the other lot goes to code generation (CgGuts)
531 cg_module :: !Module,
533 cg_tycons :: [TyCon],
534 -- Algebraic data types (including ones that started
535 -- life as classes); generate constructors and info
536 -- tables Includes newtypes, just for the benefit of
539 cg_binds :: [CoreBind],
540 -- The tidied main bindings, including
541 -- previously-implicit bindings for record and class
542 -- selectors, and data construtor wrappers. But *not*
543 -- data constructor workers; reason: we we regard them
544 -- as part of the code-gen of tycons
546 cg_dir_imps :: ![Module],
547 -- Directly-imported modules; used to generate
548 -- initialisation code
550 cg_foreign :: !ForeignStubs,
551 cg_dep_pkgs :: ![PackageId], -- Used to generate #includes for C code gen
552 cg_hpc_info :: !HpcInfo -- info about coverage tick boxes
555 -----------------------------------
558 imp_direct :: ![(Module,Bool)], -- Explicitly-imported modules
559 -- Boolean is true if we imported the whole
560 -- module (apart, perhaps, from hiding some)
561 imp_pkg_mods :: !ModuleSet, -- Non-home-package modules on which we depend,
562 -- directly or indirectly
563 imp_home_names :: !NameSet -- Home package things on which we depend,
564 -- directly or indirectly
567 -----------------------------------
568 data ForeignStubs = NoStubs
570 SDoc -- Header file prototypes for
571 -- "foreign exported" functions
572 SDoc -- C stubs to use when calling
573 -- "foreign exported" functions
574 [FastString] -- Headers that need to be included
575 -- into C code generated for this module
576 [Id] -- Foreign-exported binders
577 -- we have to generate code to register these
582 emptyModIface :: Module -> ModIface
584 = ModIface { mi_module = mod,
585 mi_mod_vers = initialVersion,
589 mi_deps = noDependencies,
592 mi_exp_vers = initialVersion,
594 mi_deprecs = NoDeprecs,
599 mi_globals = Nothing,
600 mi_rule_vers = initialVersion,
601 mi_dep_fn = emptyIfaceDepCache,
602 mi_fix_fn = emptyIfaceFixCache,
603 mi_ver_fn = emptyIfaceVerCache
608 %************************************************************************
610 \subsection{The interactive context}
612 %************************************************************************
615 data InteractiveContext
616 = InteractiveContext {
617 ic_toplev_scope :: [Module], -- Include the "top-level" scope of
620 ic_exports :: [Module], -- Include just the exports of these
623 ic_rn_gbl_env :: GlobalRdrEnv, -- The cached GlobalRdrEnv, built from
624 -- ic_toplev_scope and ic_exports
626 ic_tmp_ids :: [Id], -- Names bound during interaction.
627 -- Earlier Ids shadow
628 -- later ones with the same OccName.
630 ic_tyvars :: TyVarSet -- skolem type variables free in
631 -- ic_tmp_ids. These arise at
632 -- breakpoints in a polymorphic
633 -- context, where we have only partial
637 , ic_resume :: [Resume] -- the stack of breakpoint contexts
642 emptyInteractiveContext
643 = InteractiveContext { ic_toplev_scope = [],
645 ic_rn_gbl_env = emptyGlobalRdrEnv,
647 ic_tyvars = emptyVarSet
653 icPrintUnqual :: InteractiveContext -> PrintUnqualified
654 icPrintUnqual ictxt = mkPrintUnqualified (ic_rn_gbl_env ictxt)
657 extendInteractiveContext
658 :: InteractiveContext
661 -> InteractiveContext
662 extendInteractiveContext ictxt ids tyvars
663 = ictxt { ic_tmp_ids = ids ++ ic_tmp_ids ictxt,
664 ic_tyvars = ic_tyvars ictxt `unionVarSet` tyvars }
667 %************************************************************************
669 Building a PrintUnqualified
671 %************************************************************************
674 mkPrintUnqualified :: GlobalRdrEnv -> PrintUnqualified
675 mkPrintUnqualified env = (qual_name, qual_mod)
678 | null gres = Just (moduleName mod)
679 -- it isn't in scope at all, this probably shouldn't happen,
680 -- but we'll qualify it by the original module anyway.
681 | any unQualOK gres = Nothing
682 | (Imported is : _) <- map gre_prov gres, (idecl : _) <- is
683 = Just (is_as (is_decl idecl))
684 | otherwise = panic "mkPrintUnqualified"
686 gres = [ gre | gre <- lookupGlobalRdrEnv env occ,
687 nameModule (gre_name gre) == mod ]
689 qual_mod mod = Nothing -- For now...
693 %************************************************************************
697 %************************************************************************
700 implicitTyThings :: TyThing -> [TyThing]
701 -- If you change this, make sure you change LoadIface.ifaceDeclSubBndrs in sync
703 implicitTyThings (AnId id) = []
705 -- For type constructors, add the data cons (and their extras),
706 -- and the selectors and generic-programming Ids too
708 -- Newtypes don't have a worker Id, so don't generate that?
709 implicitTyThings (ATyCon tc) = implicitCoTyCon tc ++
710 map AnId (tyConSelIds tc) ++
711 concatMap (extras_plus . ADataCon)
714 -- For classes, add the class selector Ids, and assoicated TyCons
715 -- and the class TyCon too (and its extras)
716 implicitTyThings (AClass cl)
717 = map AnId (classSelIds cl) ++
718 map ATyCon (classATs cl) ++
719 -- No extras_plus for the classATs, because they
720 -- are only the family decls; they have no implicit things
721 extras_plus (ATyCon (classTyCon cl))
723 -- For data cons add the worker and wrapper (if any)
724 implicitTyThings (ADataCon dc) = map AnId (dataConImplicitIds dc)
726 -- | returns 'True' if there should be no interface-file declaration
727 -- for this thing on its own: either it is built-in, or it is part
728 -- of some other declaration, or it is generated implicitly by some
729 -- other declaration.
730 isImplicitTyThing :: TyThing -> Bool
731 isImplicitTyThing (ADataCon _) = True
732 isImplicitTyThing (AnId id) = isImplicitId id
733 isImplicitTyThing (AClass _) = False
734 isImplicitTyThing (ATyCon tc) = isImplicitTyCon tc
736 -- For newtypes and indexed data types, add the implicit coercion tycon
738 = map ATyCon . catMaybes $ [newTyConCo_maybe tc,
739 tyConFamilyCoercion_maybe tc]
741 extras_plus thing = thing : implicitTyThings thing
743 extendTypeEnvWithIds :: TypeEnv -> [Id] -> TypeEnv
744 extendTypeEnvWithIds env ids
745 = extendNameEnvList env [(getName id, AnId id) | id <- ids]
748 %************************************************************************
752 %************************************************************************
755 type TypeEnv = NameEnv TyThing
757 emptyTypeEnv :: TypeEnv
758 typeEnvElts :: TypeEnv -> [TyThing]
759 typeEnvClasses :: TypeEnv -> [Class]
760 typeEnvTyCons :: TypeEnv -> [TyCon]
761 typeEnvIds :: TypeEnv -> [Id]
762 typeEnvDataCons :: TypeEnv -> [DataCon]
763 lookupTypeEnv :: TypeEnv -> Name -> Maybe TyThing
765 emptyTypeEnv = emptyNameEnv
766 typeEnvElts env = nameEnvElts env
767 typeEnvClasses env = [cl | AClass cl <- typeEnvElts env]
768 typeEnvTyCons env = [tc | ATyCon tc <- typeEnvElts env]
769 typeEnvIds env = [id | AnId id <- typeEnvElts env]
770 typeEnvDataCons env = [dc | ADataCon dc <- typeEnvElts env]
772 mkTypeEnv :: [TyThing] -> TypeEnv
773 mkTypeEnv things = extendTypeEnvList emptyTypeEnv things
775 lookupTypeEnv = lookupNameEnv
777 -- Extend the type environment
778 extendTypeEnv :: TypeEnv -> TyThing -> TypeEnv
779 extendTypeEnv env thing = extendNameEnv env (getName thing) thing
781 extendTypeEnvList :: TypeEnv -> [TyThing] -> TypeEnv
782 extendTypeEnvList env things = foldl extendTypeEnv env things
786 lookupType :: DynFlags
792 lookupType dflags hpt pte name
793 -- in one-shot, we don't use the HPT
794 | not (isOneShot (ghcMode dflags)) && modulePackageId mod == this_pkg
795 = do hm <- lookupUFM hpt (moduleName mod) -- Maybe monad
796 lookupNameEnv (md_types (hm_details hm)) name
798 = lookupNameEnv pte name
799 where mod = nameModule name
800 this_pkg = thisPackage dflags
804 tyThingTyCon (ATyCon tc) = tc
805 tyThingTyCon other = pprPanic "tyThingTyCon" (ppr other)
807 tyThingClass (AClass cls) = cls
808 tyThingClass other = pprPanic "tyThingClass" (ppr other)
810 tyThingDataCon (ADataCon dc) = dc
811 tyThingDataCon other = pprPanic "tyThingDataCon" (ppr other)
813 tyThingId (AnId id) = id
814 tyThingId other = pprPanic "tyThingId" (ppr other)
817 %************************************************************************
819 \subsection{Auxiliary types}
821 %************************************************************************
823 These types are defined here because they are mentioned in ModDetails,
824 but they are mostly elaborated elsewhere
827 mkIfaceVerCache :: [(Version,IfaceDecl)]
828 -> (OccName -> Maybe (OccName, Version))
829 mkIfaceVerCache pairs
830 = \occ -> lookupOccEnv env occ
832 env = foldr add_decl emptyOccEnv pairs
833 add_decl (v,d) env0 = foldr add_imp env1 (ifaceDeclSubBndrs d)
836 env1 = extendOccEnv env0 decl_name (decl_name, v)
837 add_imp bndr env = extendOccEnv env bndr (decl_name, v)
839 emptyIfaceVerCache :: OccName -> Maybe (OccName, Version)
840 emptyIfaceVerCache occ = Nothing
842 ------------------ Deprecations -------------------------
845 | DeprecAll DeprecTxt -- Whole module deprecated
846 | DeprecSome a -- Some specific things deprecated
849 type IfaceDeprecs = Deprecs [(OccName,DeprecTxt)]
850 type Deprecations = Deprecs (NameEnv (OccName,DeprecTxt))
851 -- Keep the OccName so we can flatten the NameEnv to
852 -- get an IfaceDeprecs from a Deprecations
853 -- Only an OccName is needed, because a deprecation always
854 -- applies to things defined in the module in which the
855 -- deprecation appears.
857 mkIfaceDepCache:: IfaceDeprecs -> Name -> Maybe DeprecTxt
858 mkIfaceDepCache NoDeprecs = \n -> Nothing
859 mkIfaceDepCache (DeprecAll t) = \n -> Just t
860 mkIfaceDepCache (DeprecSome pairs) = lookupOccEnv (mkOccEnv pairs) . nameOccName
862 emptyIfaceDepCache :: Name -> Maybe DeprecTxt
863 emptyIfaceDepCache n = Nothing
865 plusDeprecs :: Deprecations -> Deprecations -> Deprecations
866 plusDeprecs d NoDeprecs = d
867 plusDeprecs NoDeprecs d = d
868 plusDeprecs d (DeprecAll t) = DeprecAll t
869 plusDeprecs (DeprecAll t) d = DeprecAll t
870 plusDeprecs (DeprecSome v1) (DeprecSome v2) = DeprecSome (v1 `plusNameEnv` v2)
875 type Avails = [AvailInfo]
876 type AvailInfo = GenAvailInfo Name
877 type RdrAvailInfo = GenAvailInfo OccName
879 data GenAvailInfo name = Avail name -- An ordinary identifier
880 | AvailTC name -- The name of the type or class
881 [name] -- The available pieces of type/class.
882 -- NB: If the type or class is itself
883 -- to be in scope, it must be in this list.
884 -- Thus, typically: AvailTC Eq [Eq, ==, /=]
886 -- Equality used when deciding if the interface has changed
888 type IfaceExport = (Module, [GenAvailInfo OccName])
890 availsToNameSet :: [AvailInfo] -> NameSet
891 availsToNameSet avails = foldr add emptyNameSet avails
892 where add avail set = addListToNameSet set (availNames avail)
894 availsToNameEnv :: [AvailInfo] -> NameEnv AvailInfo
895 availsToNameEnv avails = foldr add emptyNameEnv avails
896 where add avail env = extendNameEnvList env
897 (zip (availNames avail) (repeat avail))
899 availName :: GenAvailInfo name -> name
900 availName (Avail n) = n
901 availName (AvailTC n _) = n
903 availNames :: GenAvailInfo name -> [name]
904 availNames (Avail n) = [n]
905 availNames (AvailTC n ns) = ns
907 instance Outputable n => Outputable (GenAvailInfo n) where
910 pprAvail :: Outputable n => GenAvailInfo n -> SDoc
911 pprAvail (Avail n) = ppr n
912 pprAvail (AvailTC n ns) = ppr n <> braces (hsep (punctuate comma (map ppr ns)))
916 mkIfaceFixCache :: [(OccName, Fixity)] -> OccName -> Fixity
917 mkIfaceFixCache pairs
918 = \n -> lookupOccEnv env n `orElse` defaultFixity
922 emptyIfaceFixCache :: OccName -> Fixity
923 emptyIfaceFixCache n = defaultFixity
925 -- This fixity environment is for source code only
926 type FixityEnv = NameEnv FixItem
928 -- We keep the OccName in the range so that we can generate an interface from it
929 data FixItem = FixItem OccName Fixity SrcSpan
931 instance Outputable FixItem where
932 ppr (FixItem occ fix loc) = ppr fix <+> ppr occ <+> parens (ppr loc)
934 emptyFixityEnv :: FixityEnv
935 emptyFixityEnv = emptyNameEnv
937 lookupFixity :: FixityEnv -> Name -> Fixity
938 lookupFixity env n = case lookupNameEnv env n of
939 Just (FixItem _ fix _) -> fix
940 Nothing -> defaultFixity
944 %************************************************************************
946 \subsection{WhatsImported}
948 %************************************************************************
951 type WhetherHasOrphans = Bool
953 -- * an instance decl in a module other than the defn module for
954 -- one of the tycons or classes in the instance head
955 -- * a transformation rule in a module other than the one defining
956 -- the function in the head of the rule.
958 type WhetherHasFamInst = Bool -- This module defines family instances?
960 type IsBootInterface = Bool
962 -- Dependency info about modules and packages below this one
963 -- in the import hierarchy. See TcRnTypes.ImportAvails for details.
964 -- The orphan modules in `dep_orphs' do *not* include family instance orphans,
965 -- as they are anyway included in `dep_finsts'.
967 -- Invariant: the dependencies of a module M never includes M
968 -- Invariant: the lists are unordered, with no duplicates
970 = Deps { dep_mods :: [(ModuleName, -- Home-package module dependencies
972 , dep_pkgs :: [PackageId] -- External package dependencies
973 , dep_orphs :: [Module] -- Orphan modules (whether home or
975 , dep_finsts :: [Module] -- Modules that contain family
976 -- instances (whether home or
980 -- Equality used only for old/new comparison in MkIface.addVersionInfo
982 noDependencies :: Dependencies
983 noDependencies = Deps [] [] [] []
986 = Usage { usg_name :: ModuleName, -- Name of the module
987 usg_mod :: Version, -- Module version
988 usg_entities :: [(OccName,Version)], -- Sorted by occurrence name
989 -- NB. usages are for parent names only, eg. tycon but not constructors.
990 usg_exports :: Maybe Version, -- Export-list version, if we depend on it
991 usg_rules :: Version -- Orphan-rules version (for non-orphan
992 -- modules this will always be initialVersion)
994 -- This type doesn't let you say "I imported f but none of the rules in
995 -- the module". If you use anything in the module you get its rule version
996 -- So if the rules change, you'll recompile, even if you don't use them.
997 -- This is easy to implement, and it's safer: you might not have used the rules last
998 -- time round, but if someone has added a new rule you might need it this time
1000 -- The export list field is (Just v) if we depend on the export list:
1001 -- i.e. we imported the module directly, whether or not we
1002 -- enumerated the things we imported, or just imported everything
1003 -- We need to recompile if M's exports change, because
1004 -- if the import was import M, we might now have a name clash in the
1005 -- importing module.
1006 -- if the import was import M(x) M might no longer export x
1007 -- The only way we don't depend on the export list is if we have
1009 -- And of course, for modules that aren't imported directly we don't
1010 -- depend on their export lists
1014 %************************************************************************
1016 The External Package State
1018 %************************************************************************
1021 type PackageTypeEnv = TypeEnv
1022 type PackageRuleBase = RuleBase
1023 type PackageInstEnv = InstEnv
1024 type PackageFamInstEnv = FamInstEnv
1026 data ExternalPackageState
1028 eps_is_boot :: !(ModuleNameEnv (ModuleName, IsBootInterface)),
1029 -- In OneShot mode (only), home-package modules
1030 -- accumulate in the external package state, and are
1031 -- sucked in lazily. For these home-pkg modules
1032 -- (only) we need to record which are boot modules.
1033 -- We set this field after loading all the
1034 -- explicitly-imported interfaces, but before doing
1037 -- The ModuleName part is not necessary, but it's useful for
1038 -- debug prints, and it's convenient because this field comes
1039 -- direct from TcRnTypes.ImportAvails.imp_dep_mods
1041 eps_PIT :: !PackageIfaceTable,
1042 -- The ModuleIFaces for modules in external packages
1043 -- whose interfaces we have opened
1044 -- The declarations in these interface files are held in
1045 -- eps_decls, eps_inst_env, eps_fam_inst_env, eps_rules
1046 -- (below), not in the mi_decls fields of the iPIT.
1047 -- What _is_ in the iPIT is:
1054 eps_PTE :: !PackageTypeEnv, -- Domain = external-package modules
1056 eps_inst_env :: !PackageInstEnv, -- The total InstEnv accumulated
1057 -- from all the external-package
1059 eps_fam_inst_env :: !PackageFamInstEnv,-- Ditto FamInstEnv
1060 eps_rule_base :: !PackageRuleBase, -- Ditto RuleEnv
1062 eps_mod_fam_inst_env :: !(ModuleEnv FamInstEnv), -- identifies family
1063 -- instances of each mod
1065 eps_stats :: !EpsStats
1068 -- "In" means read from iface files
1069 -- "Out" means actually sucked in and type-checked
1070 data EpsStats = EpsStats { n_ifaces_in
1071 , n_decls_in, n_decls_out
1072 , n_rules_in, n_rules_out
1073 , n_insts_in, n_insts_out :: !Int }
1075 addEpsInStats :: EpsStats -> Int -> Int -> Int -> EpsStats
1076 -- Add stats for one newly-read interface
1077 addEpsInStats stats n_decls n_insts n_rules
1078 = stats { n_ifaces_in = n_ifaces_in stats + 1
1079 , n_decls_in = n_decls_in stats + n_decls
1080 , n_insts_in = n_insts_in stats + n_insts
1081 , n_rules_in = n_rules_in stats + n_rules }
1084 The NameCache makes sure that there is just one Unique assigned for
1085 each original name; i.e. (module-name, occ-name) pair. The Name is
1086 always stored as a Global, and has the SrcLoc of its binding location.
1087 Actually that's not quite right. When we first encounter the original
1088 name, we might not be at its binding site (e.g. we are reading an
1089 interface file); so we give it 'noSrcLoc' then. Later, when we find
1090 its binding site, we fix it up.
1094 = NameCache { nsUniqs :: UniqSupply,
1095 -- Supply of uniques
1096 nsNames :: OrigNameCache,
1097 -- Ensures that one original name gets one unique
1098 nsIPs :: OrigIParamCache
1099 -- Ensures that one implicit parameter name gets one unique
1102 type OrigNameCache = ModuleEnv (OccEnv Name)
1103 type OrigIParamCache = FiniteMap (IPName OccName) (IPName Name)
1108 %************************************************************************
1110 The module graph and ModSummary type
1111 A ModSummary is a node in the compilation manager's
1112 dependency graph, and it's also passed to hscMain
1114 %************************************************************************
1116 A ModuleGraph contains all the nodes from the home package (only).
1117 There will be a node for each source module, plus a node for each hi-boot
1121 type ModuleGraph = [ModSummary] -- The module graph,
1122 -- NOT NECESSARILY IN TOPOLOGICAL ORDER
1124 emptyMG :: ModuleGraph
1127 -- The nodes of the module graph are
1128 -- EITHER a regular Haskell source module
1129 -- OR a hi-boot source module
1133 ms_mod :: Module, -- Identity of the module
1134 ms_hsc_src :: HscSource, -- Source is Haskell, hs-boot, external core
1135 ms_location :: ModLocation, -- Location
1136 ms_hs_date :: ClockTime, -- Timestamp of source file
1137 ms_obj_date :: Maybe ClockTime, -- Timestamp of object, maybe
1138 ms_srcimps :: [Located ModuleName], -- Source imports
1139 ms_imps :: [Located ModuleName], -- Non-source imports
1140 ms_hspp_file :: FilePath, -- Filename of preprocessed source.
1141 ms_hspp_opts :: DynFlags, -- Cached flags from OPTIONS, INCLUDE
1142 -- and LANGUAGE pragmas.
1143 ms_hspp_buf :: Maybe StringBuffer -- The actual preprocessed source, maybe.
1146 ms_mod_name :: ModSummary -> ModuleName
1147 ms_mod_name = moduleName . ms_mod
1149 -- The ModLocation contains both the original source filename and the
1150 -- filename of the cleaned-up source file after all preprocessing has been
1151 -- done. The point is that the summariser will have to cpp/unlit/whatever
1152 -- all files anyway, and there's no point in doing this twice -- just
1153 -- park the result in a temp file, put the name of it in the location,
1154 -- and let @compile@ read from that file on the way back up.
1156 -- The ModLocation is stable over successive up-sweeps in GHCi, wheres
1157 -- the ms_hs_date and imports can, of course, change
1159 msHsFilePath, msHiFilePath, msObjFilePath :: ModSummary -> FilePath
1160 msHsFilePath ms = expectJust "msHsFilePath" (ml_hs_file (ms_location ms))
1161 msHiFilePath ms = ml_hi_file (ms_location ms)
1162 msObjFilePath ms = ml_obj_file (ms_location ms)
1164 isBootSummary :: ModSummary -> Bool
1165 isBootSummary ms = isHsBoot (ms_hsc_src ms)
1167 instance Outputable ModSummary where
1169 = sep [text "ModSummary {",
1170 nest 3 (sep [text "ms_hs_date = " <> text (show (ms_hs_date ms)),
1171 text "ms_mod =" <+> ppr (ms_mod ms)
1172 <> text (hscSourceString (ms_hsc_src ms)) <> comma,
1173 text "ms_imps =" <+> ppr (ms_imps ms),
1174 text "ms_srcimps =" <+> ppr (ms_srcimps ms)]),
1178 showModMsg :: HscTarget -> Bool -> ModSummary -> String
1179 showModMsg target recomp mod_summary
1180 = showSDoc (hsep [text (mod_str ++ replicate (max 0 (16 - length mod_str)) ' '),
1181 char '(', text (msHsFilePath mod_summary) <> comma,
1183 HscInterpreted | recomp
1184 -> text "interpreted"
1185 HscNothing -> text "nothing"
1186 _other -> text (msObjFilePath mod_summary),
1189 mod = moduleName (ms_mod mod_summary)
1190 mod_str = showSDoc (ppr mod) ++ hscSourceString (ms_hsc_src mod_summary)
1194 %************************************************************************
1196 \subsection{Hpc Support}
1198 %************************************************************************
1201 data HpcInfo = HpcInfo
1202 { hpcInfoTickCount :: Int
1203 , hpcInfoHash :: Int
1207 noHpcInfo :: HpcInfo
1208 noHpcInfo = NoHpcInfo
1211 %************************************************************************
1213 \subsection{Linkable stuff}
1215 %************************************************************************
1217 This stuff is in here, rather than (say) in Linker.lhs, because the Linker.lhs
1218 stuff is the *dynamic* linker, and isn't present in a stage-1 compiler
1221 data Linkable = LM {
1222 linkableTime :: ClockTime, -- Time at which this linkable was built
1223 -- (i.e. when the bytecodes were produced,
1224 -- or the mod date on the files)
1225 linkableModule :: Module, -- Should be Module, but see below
1226 linkableUnlinked :: [Unlinked]
1229 isObjectLinkable :: Linkable -> Bool
1230 isObjectLinkable l = not (null unlinked) && all isObject unlinked
1231 where unlinked = linkableUnlinked l
1232 -- A linkable with no Unlinked's is treated as a BCO. We can
1233 -- generate a linkable with no Unlinked's as a result of
1234 -- compiling a module in HscNothing mode, and this choice
1235 -- happens to work well with checkStability in module GHC.
1237 instance Outputable Linkable where
1238 ppr (LM when_made mod unlinkeds)
1239 = (text "LinkableM" <+> parens (text (show when_made)) <+> ppr mod)
1240 $$ nest 3 (ppr unlinkeds)
1242 -------------------------------------------
1247 | BCOs CompiledByteCode
1250 data CompiledByteCode = NoByteCode
1253 instance Outputable Unlinked where
1254 ppr (DotO path) = text "DotO" <+> text path
1255 ppr (DotA path) = text "DotA" <+> text path
1256 ppr (DotDLL path) = text "DotDLL" <+> text path
1258 ppr (BCOs bcos) = text "BCOs" <+> ppr bcos
1260 ppr (BCOs bcos) = text "No byte code"
1263 isObject (DotO _) = True
1264 isObject (DotA _) = True
1265 isObject (DotDLL _) = True
1268 isInterpretable = not . isObject
1270 nameOfObject (DotO fn) = fn
1271 nameOfObject (DotA fn) = fn
1272 nameOfObject (DotDLL fn) = fn
1273 nameOfObject other = pprPanic "nameOfObject" (ppr other)
1275 byteCodeOfObject (BCOs bc) = bc
1276 byteCodeOfObject other = pprPanic "byteCodeOfObject" (ppr other)
1279 %************************************************************************
1281 \subsection{Breakpoint Support}
1283 %************************************************************************
1286 type BreakIndex = Int
1288 -- | all the information about the breakpoints for a given module
1291 { modBreaks_flags :: BreakArray
1292 -- The array of flags, one per breakpoint,
1293 -- indicating which breakpoints are enabled.
1294 , modBreaks_locs :: !(Array BreakIndex SrcSpan)
1295 -- An array giving the source span of each breakpoint.
1296 , modBreaks_vars :: !(Array BreakIndex [OccName])
1297 -- An array giving the names of the free variables at each breakpoint.
1300 emptyModBreaks :: ModBreaks
1301 emptyModBreaks = ModBreaks
1302 { modBreaks_flags = error "ModBreaks.modBreaks_array not initialised"
1303 -- Todo: can we avoid this?
1304 , modBreaks_locs = array (0,-1) []
1305 , modBreaks_vars = array (0,-1) []