2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[TcModule]{Typechecking a whole module}
9 mkExportEnv, getModuleContents, tcRnStmt,
10 tcRnGetInfo, GetInfoResult,
20 #include "HsVersions.h"
24 import {-# SOURCE #-} TcSplice ( tcSpliceDecls )
27 import DynFlags ( DynFlag(..), DynFlags(..), dopt, GhcMode(..) )
28 import StaticFlags ( opt_PprStyle_Debug )
29 import Packages ( moduleToPackageConfig, mkPackageId, package,
31 import HsSyn ( HsModule(..), HsExtCore(..), HsGroup(..), LHsDecl,
32 SpliceDecl(..), HsBind(..), LHsBinds,
33 emptyGroup, appendGroups,
34 nlHsApp, nlHsVar, pprLHsBinds )
35 import RdrHsSyn ( findSplice )
37 import PrelNames ( runMainIOName, rootMainName, mAIN,
39 import RdrName ( RdrName, mkRdrUnqual, emptyGlobalRdrEnv )
40 import TcHsSyn ( zonkTopDecls )
41 import TcExpr ( tcInferRho )
43 import TcType ( tidyTopType, tcEqType, mkTyVarTys, substTyWith )
44 import Inst ( showLIE )
45 import InstEnv ( extendInstEnvList, Instance, pprInstances, instanceDFunId )
46 import TcBinds ( tcTopBinds, tcHsBootSigs )
47 import TcDefaults ( tcDefaults )
48 import TcEnv ( tcExtendGlobalValEnv, iDFunId )
49 import TcRules ( tcRules )
50 import TcForeign ( tcForeignImports, tcForeignExports )
51 import TcInstDcls ( tcInstDecls1, tcInstDecls2 )
52 import TcIface ( tcExtCoreBindings, tcHiBootIface )
53 import TcSimplify ( tcSimplifyTop )
54 import TcTyClsDecls ( tcTyAndClassDecls )
55 import LoadIface ( loadOrphanModules )
56 import RnNames ( importsFromLocalDecls, rnImports, exportsFromAvail,
57 reportUnusedNames, reportDeprecations )
58 import RnEnv ( lookupSrcOcc_maybe )
59 import RnSource ( rnSrcDecls, rnTyClDecls, checkModDeprec )
60 import PprCore ( pprRules, pprCoreBindings )
61 import CoreSyn ( CoreRule, bindersOfBinds )
62 import DataCon ( dataConWrapId )
63 import ErrUtils ( Messages, mkDumpDoc, showPass )
64 import Id ( Id, mkExportedLocalId, isLocalId, idName, idType )
66 import Module ( Module, ModuleEnv, mkModule, moduleEnvElts, elemModuleEnv )
67 import OccName ( mkVarOcc )
68 import Name ( Name, NamedThing(..), isExternalName, getSrcLoc, isWiredInName )
70 import TyCon ( tyConHasGenerics, isSynTyCon, getSynTyConDefn, tyConKind )
71 import SrcLoc ( srcLocSpan, Located(..), noLoc )
72 import DriverPhases ( HscSource(..), isHsBoot )
73 import HscTypes ( ModGuts(..), ModDetails(..), emptyModDetails,
74 HscEnv(..), ExternalPackageState(..),
75 IsBootInterface, noDependencies,
76 Deprecs( NoDeprecs ), plusDeprecs,
77 ForeignStubs(NoStubs), TyThing(..),
78 TypeEnv, lookupTypeEnv, hptInstances,
79 extendTypeEnvWithIds, typeEnvIds, typeEnvTyCons, typeEnvElts,
85 import HsSyn ( HsStmtContext(..), Stmt(..), HsExpr(..), HsBindGroup(..),
86 LStmt, LHsExpr, LHsType, mkMatchGroup,
87 collectLStmtsBinders, mkSimpleMatch, nlVarPat,
88 placeHolderType, noSyntaxExpr )
89 import RdrName ( GlobalRdrEnv, mkGlobalRdrEnv, GlobalRdrElt(..),
90 Provenance(..), ImportSpec(..), globalRdrEnvElts,
91 unQualOK, lookupLocalRdrEnv, extendLocalRdrEnv,
93 import RnSource ( addTcgDUs )
94 import TcHsSyn ( mkHsLet, zonkTopLExpr, zonkTopBndrs )
95 import TcHsType ( kcHsType )
96 import TcMType ( zonkTcType, zonkQuantifiedTyVar )
97 import TcMatches ( tcStmts, tcDoStmt )
98 import TcSimplify ( tcSimplifyInteractive, tcSimplifyInfer )
99 import TcType ( Type, mkForAllTys, mkFunTys, mkTyConApp, tyVarsOfType,
100 isUnLiftedType, tyClsNamesOfDFunHead, tyClsNamesOfType )
101 import TcEnv ( tcLookupTyCon, tcLookupId, tcLookupGlobal )
102 import RnTypes ( rnLHsType )
103 import Inst ( tcGetInstEnvs )
104 import InstEnv ( classInstances, instEnvElts )
105 import RnExpr ( rnStmts, rnLExpr )
106 import LoadIface ( loadSrcInterface, loadSysInterface )
107 import IfaceSyn ( IfaceDecl(..), IfaceClassOp(..), IfaceConDecl(..),
108 IfaceExtName(..), IfaceConDecls(..),
110 import IfaceType ( IfaceType, toIfaceType,
111 interactiveExtNameFun )
112 import IfaceEnv ( lookupOrig, ifaceExportNames )
113 import Module ( lookupModuleEnv, moduleSetElts, mkModuleSet )
114 import RnEnv ( lookupOccRn, dataTcOccs, lookupFixityRn )
115 import Id ( isImplicitId, setIdType, globalIdDetails )
116 import MkId ( unsafeCoerceId )
117 import DataCon ( dataConTyCon )
118 import TyCon ( tyConName )
119 import TysWiredIn ( mkListTy, unitTy )
120 import IdInfo ( GlobalIdDetails(..) )
121 import SrcLoc ( interactiveSrcLoc, unLoc )
123 import Var ( globaliseId )
124 import Name ( nameOccName, nameModule )
125 import OccName ( occNameUserString, isTcOcc )
126 import NameEnv ( delListFromNameEnv )
127 import PrelNames ( iNTERACTIVE, ioTyConName, printName, itName,
128 bindIOName, thenIOName, returnIOName )
129 import HscTypes ( InteractiveContext(..), HomeModInfo(..),
130 availNames, availName, ModIface(..), icPrintUnqual,
132 import BasicTypes ( RecFlag(..), Fixity )
133 import ListSetOps ( removeDups )
134 import Panic ( ghcError, GhcException(..) )
135 import SrcLoc ( SrcLoc )
138 import FastString ( mkFastString )
139 import Util ( sortLe )
140 import Bag ( unionBags, snocBag, emptyBag, unitBag, unionManyBags )
142 import Maybe ( isJust )
147 %************************************************************************
149 Typecheck and rename a module
151 %************************************************************************
157 -> Bool -- True <=> save renamed syntax
158 -> Located (HsModule RdrName)
159 -> IO (Messages, Maybe TcGblEnv)
161 tcRnModule hsc_env hsc_src save_rn_decls
162 (L loc (HsModule maybe_mod export_ies
163 import_decls local_decls mod_deprec))
164 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
166 let { this_mod = case maybe_mod of
167 Nothing -> mAIN -- 'module M where' is omitted
168 Just (L _ mod) -> mod } ; -- The normal case
170 initTc hsc_env hsc_src this_mod $
173 checkForPackageModule (hsc_dflags hsc_env) this_mod;
175 -- Deal with imports; sets tcg_rdr_env, tcg_imports
176 (rdr_env, imports) <- rnImports import_decls ;
178 let { dep_mods :: ModuleEnv (Module, IsBootInterface)
179 ; dep_mods = imp_dep_mods imports
181 -- We want instance declarations from all home-package
182 -- modules below this one, including boot modules, except
183 -- ourselves. The 'except ourselves' is so that we don't
184 -- get the instances from this module's hs-boot file
185 ; want_instances :: Module -> Bool
186 ; want_instances mod = mod `elemModuleEnv` dep_mods
188 ; home_insts = hptInstances hsc_env want_instances
191 -- Record boot-file info in the EPS, so that it's
192 -- visible to loadHiBootInterface in tcRnSrcDecls,
193 -- and any other incrementally-performed imports
194 updateEps_ (\eps -> eps { eps_is_boot = dep_mods }) ;
196 -- Update the gbl env
198 gbl { tcg_rdr_env = rdr_env,
199 tcg_inst_env = extendInstEnvList (tcg_inst_env gbl) home_insts,
200 tcg_imports = tcg_imports gbl `plusImportAvails` imports,
201 tcg_rn_decls = if save_rn_decls then
207 traceRn (text "rn1" <+> ppr (imp_dep_mods imports)) ;
208 -- Fail if there are any errors so far
209 -- The error printing (if needed) takes advantage
210 -- of the tcg_env we have now set
213 -- Load any orphan-module interfaces, so that
214 -- their rules and instance decls will be found
215 loadOrphanModules (imp_orphs imports) ;
217 traceRn (text "rn1a") ;
218 -- Rename and type check the declarations
219 tcg_env <- if isHsBoot hsc_src then
220 tcRnHsBootDecls local_decls
222 tcRnSrcDecls local_decls ;
223 setGblEnv tcg_env $ do {
225 traceRn (text "rn3") ;
227 -- Report the use of any deprecated things
228 -- We do this before processsing the export list so
229 -- that we don't bleat about re-exporting a deprecated
230 -- thing (especially via 'module Foo' export item)
231 -- Only uses in the body of the module are complained about
232 reportDeprecations tcg_env ;
234 -- Process the export list
235 exports <- exportsFromAvail (isJust maybe_mod) export_ies ;
237 -- Check whether the entire module is deprecated
238 -- This happens only once per module
239 let { mod_deprecs = checkModDeprec mod_deprec } ;
241 -- Add exports and deprecations to envt
242 let { final_env = tcg_env { tcg_exports = exports,
243 tcg_dus = tcg_dus tcg_env `plusDU` usesOnly exports,
244 tcg_deprecs = tcg_deprecs tcg_env `plusDeprecs`
246 -- A module deprecation over-rides the earlier ones
249 -- Report unused names
250 reportUnusedNames export_ies final_env ;
252 -- Dump output and return
257 -- This is really a sanity check that the user has given -package-name
258 -- if necessary. -package-name is only necessary when the package database
259 -- already contains the current package, because then we can't tell
260 -- whether a given module is in the current package or not, without knowing
261 -- the name of the current package.
262 checkForPackageModule dflags this_mod
263 | not (isHomeModule dflags this_mod),
264 Just (pkg,_) <- moduleToPackageConfig dflags this_mod =
266 ppr_pkg = ppr (mkPackageId (package pkg))
268 addErr (ptext SLIT("Module") <+> quotes (ppr this_mod) <+>
269 ptext SLIT("is a member of package") <+> ppr_pkg <> char '.' $$
270 ptext SLIT("To compile this module, please use -ignore-package") <+> ppr_pkg <> char '.')
271 | otherwise = return ()
275 %************************************************************************
277 Type-checking external-core modules
279 %************************************************************************
282 tcRnExtCore :: HscEnv
284 -> IO (Messages, Maybe ModGuts)
285 -- Nothing => some error occurred
287 tcRnExtCore hsc_env (HsExtCore this_mod decls src_binds)
288 -- The decls are IfaceDecls; all names are original names
289 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
291 initTc hsc_env ExtCoreFile this_mod $ do {
293 let { ldecls = map noLoc decls } ;
295 -- Deal with the type declarations; first bring their stuff
296 -- into scope, then rname them, then type check them
297 tcg_env <- importsFromLocalDecls (mkFakeGroup ldecls) ;
299 setGblEnv tcg_env $ do {
301 rn_decls <- rnTyClDecls ldecls ;
304 -- Dump trace of renaming part
305 rnDump (ppr rn_decls) ;
307 -- Typecheck them all together so that
308 -- any mutually recursive types are done right
309 tcg_env <- checkNoErrs (tcTyAndClassDecls emptyModDetails rn_decls) ;
310 -- Make the new type env available to stuff slurped from interface files
312 setGblEnv tcg_env $ do {
314 -- Now the core bindings
315 core_binds <- initIfaceExtCore (tcExtCoreBindings src_binds) ;
319 bndrs = bindersOfBinds core_binds ;
320 my_exports = mkNameSet (map idName bndrs) ;
321 -- ToDo: export the data types also?
323 final_type_env = extendTypeEnvWithIds (tcg_type_env tcg_env) bndrs ;
325 mod_guts = ModGuts { mg_module = this_mod,
327 mg_usages = [], -- ToDo: compute usage
328 mg_dir_imps = [], -- ??
329 mg_deps = noDependencies, -- ??
330 mg_exports = my_exports,
331 mg_types = final_type_env,
332 mg_insts = tcg_insts tcg_env,
334 mg_binds = core_binds,
337 mg_rdr_env = emptyGlobalRdrEnv,
338 mg_fix_env = emptyFixityEnv,
339 mg_deprecs = NoDeprecs,
343 tcCoreDump mod_guts ;
348 mkFakeGroup decls -- Rather clumsy; lots of unused fields
349 = HsGroup { hs_tyclds = decls, -- This is the one we want
350 hs_valds = [], hs_fords = [],
351 hs_instds = [], hs_fixds = [], hs_depds = [],
352 hs_ruleds = [], hs_defds = [] }
356 %************************************************************************
358 Type-checking the top level of a module
360 %************************************************************************
363 tcRnSrcDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
364 -- Returns the variables free in the decls
365 -- Reason: solely to report unused imports and bindings
367 = do { -- Load the hi-boot interface for this module, if any
368 -- We do this now so that the boot_names can be passed
369 -- to tcTyAndClassDecls, because the boot_names are
370 -- automatically considered to be loop breakers
372 boot_iface <- tcHiBootIface mod ;
374 -- Do all the declarations
375 (tc_envs, lie) <- getLIE (tc_rn_src_decls boot_iface decls) ;
377 -- tcSimplifyTop deals with constant or ambiguous InstIds.
378 -- How could there be ambiguous ones? They can only arise if a
379 -- top-level decl falls under the monomorphism
380 -- restriction, and no subsequent decl instantiates its
381 -- type. (Usually, ambiguous type variables are resolved
382 -- during the generalisation step.)
383 traceTc (text "Tc8") ;
384 inst_binds <- setEnvs tc_envs (tcSimplifyTop lie) ;
385 -- Setting the global env exposes the instances to tcSimplifyTop
386 -- Setting the local env exposes the local Ids to tcSimplifyTop,
387 -- so that we get better error messages (monomorphism restriction)
389 -- Backsubstitution. This must be done last.
390 -- Even tcSimplifyTop may do some unification.
391 traceTc (text "Tc9") ;
392 let { (tcg_env, _) = tc_envs ;
393 TcGblEnv { tcg_type_env = type_env, tcg_binds = binds,
394 tcg_rules = rules, tcg_fords = fords } = tcg_env } ;
396 (bind_ids, binds', fords', rules') <- zonkTopDecls (binds `unionBags` inst_binds)
399 let { final_type_env = extendTypeEnvWithIds type_env bind_ids
400 ; tcg_env' = tcg_env { tcg_type_env = final_type_env,
403 tcg_fords = fords' } } ;
405 -- Make the new type env available to stuff slurped from interface files
406 writeMutVar (tcg_type_env_var tcg_env) final_type_env ;
408 -- Compare the hi-boot iface (if any) with the real thing
409 dfun_binds <- checkHiBootIface tcg_env' boot_iface ;
411 return (tcg_env' { tcg_binds = tcg_binds tcg_env' `unionBags` dfun_binds })
414 tc_rn_src_decls :: ModDetails -> [LHsDecl RdrName] -> TcM (TcGblEnv, TcLclEnv)
415 -- Loops around dealing with each top level inter-splice group
416 -- in turn, until it's dealt with the entire module
417 tc_rn_src_decls boot_details ds
418 = do { let { (first_group, group_tail) = findSplice ds } ;
419 -- If ds is [] we get ([], Nothing)
421 -- Type check the decls up to, but not including, the first splice
422 tc_envs@(tcg_env,tcl_env) <- tcRnGroup boot_details first_group ;
424 -- Bale out if errors; for example, error recovery when checking
425 -- the RHS of 'main' can mean that 'main' is not in the envt for
426 -- the subsequent checkMain test
431 -- If there is no splice, we're nearly done
433 Nothing -> do { -- Last thing: check for `main'
434 tcg_env <- checkMain ;
435 return (tcg_env, tcl_env)
438 -- If there's a splice, we must carry on
439 Just (SpliceDecl splice_expr, rest_ds) -> do {
441 failWithTc (text "Can't do a top-level splice; need a bootstrapped compiler")
444 -- Rename the splice expression, and get its supporting decls
445 (rn_splice_expr, splice_fvs) <- rnLExpr splice_expr ;
446 failIfErrsM ; -- Don't typecheck if renaming failed
448 -- Execute the splice
449 spliced_decls <- tcSpliceDecls rn_splice_expr ;
451 -- Glue them on the front of the remaining decls and loop
452 setGblEnv (tcg_env `addTcgDUs` usesOnly splice_fvs) $
453 tc_rn_src_decls boot_details (spliced_decls ++ rest_ds)
458 %************************************************************************
460 Compiling hs-boot source files, and
461 comparing the hi-boot interface with the real thing
463 %************************************************************************
466 tcRnHsBootDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
467 tcRnHsBootDecls decls
468 = do { let { (first_group, group_tail) = findSplice decls }
471 Just stuff -> spliceInHsBootErr stuff
474 -- Rename the declarations
475 ; (tcg_env, rn_group) <- rnTopSrcDecls first_group
476 ; setGblEnv tcg_env $ do {
478 -- Todo: check no foreign decls, no rules, no default decls
480 -- Typecheck type/class decls
481 ; traceTc (text "Tc2")
482 ; let tycl_decls = hs_tyclds rn_group
483 ; tcg_env <- checkNoErrs (tcTyAndClassDecls emptyModDetails tycl_decls)
484 ; setGblEnv tcg_env $ do {
486 -- Typecheck instance decls
487 ; traceTc (text "Tc3")
488 ; (tcg_env, inst_infos, _binds) <- tcInstDecls1 tycl_decls (hs_instds rn_group)
489 ; setGblEnv tcg_env $ do {
491 -- Typecheck value declarations
492 ; traceTc (text "Tc5")
493 ; val_ids <- tcHsBootSigs (hs_valds rn_group)
496 -- No simplification or zonking to do
497 ; traceTc (text "Tc7a")
498 ; gbl_env <- getGblEnv
500 -- Make the final type-env
501 -- Include the dfun_ids so that their type sigs get
502 -- are written into the interface file
503 ; let { type_env0 = tcg_type_env gbl_env
504 ; type_env1 = extendTypeEnvWithIds type_env0 val_ids
505 ; type_env2 = extendTypeEnvWithIds type_env1 dfun_ids
506 ; dfun_ids = map iDFunId inst_infos }
507 ; return (gbl_env { tcg_type_env = type_env2 })
510 spliceInHsBootErr (SpliceDecl (L loc _), _)
511 = addErrAt loc (ptext SLIT("Splices are not allowed in hs-boot files"))
514 Once we've typechecked the body of the module, we want to compare what
515 we've found (gathered in a TypeEnv) with the hi-boot details (if any).
518 checkHiBootIface :: TcGblEnv -> ModDetails -> TcM (LHsBinds Id)
519 -- Compare the hi-boot file for this module (if there is one)
520 -- with the type environment we've just come up with
521 -- In the common case where there is no hi-boot file, the list
522 -- of boot_names is empty.
524 -- The bindings we return give bindings for the dfuns defined in the
525 -- hs-boot file, such as $fbEqT = $fEqT
528 (TcGblEnv { tcg_insts = local_insts, tcg_type_env = local_type_env })
529 (ModDetails { md_insts = boot_insts, md_types = boot_type_env })
530 = do { mapM_ check_one (typeEnvElts boot_type_env)
531 ; dfun_binds <- mapM check_inst boot_insts
532 ; return (unionManyBags dfun_binds) }
538 = case lookupTypeEnv local_type_env name of
539 Nothing -> addErrTc (missingBootThing boot_thing)
540 Just real_thing -> check_thing boot_thing real_thing
542 name = getName boot_thing
544 no_check name = isWiredInName name -- No checking for wired-in names. In particular,
545 -- 'error' is handled by a rather gross hack
546 -- (see comments in GHC.Err.hs-boot)
547 || name `elem` dfun_names
548 dfun_names = map getName boot_insts
551 = case [dfun | inst <- local_insts,
552 let dfun = instanceDFunId inst,
553 idType dfun `tcEqType` boot_inst_ty ] of
554 [] -> do { addErrTc (instMisMatch boot_inst); return emptyBag }
555 (dfun:_) -> return (unitBag $ noLoc $ VarBind local_boot_dfun (nlHsVar dfun))
557 boot_dfun = instanceDFunId boot_inst
558 boot_inst_ty = idType boot_dfun
559 local_boot_dfun = mkExportedLocalId (idName boot_dfun) boot_inst_ty
562 check_thing (ATyCon boot_tc) (ATyCon real_tc)
563 | isSynTyCon boot_tc && isSynTyCon real_tc,
564 defn1 `tcEqType` substTyWith tvs2 (mkTyVarTys tvs1) defn2
567 | tyConKind boot_tc == tyConKind real_tc
570 (tvs1, defn1) = getSynTyConDefn boot_tc
571 (tvs2, defn2) = getSynTyConDefn boot_tc
573 check_thing (AnId boot_id) (AnId real_id)
574 | idType boot_id `tcEqType` idType real_id
577 check_thing (ADataCon dc1) (ADataCon dc2)
578 | idType (dataConWrapId dc1) `tcEqType` idType (dataConWrapId dc2)
581 -- Can't declare a class in a hi-boot file
583 check_thing boot_thing real_thing -- Default case; failure
584 = addErrAt (srcLocSpan (getSrcLoc real_thing))
585 (bootMisMatch real_thing)
588 missingBootThing thing
589 = ppr thing <+> ptext SLIT("is defined in the hs-boot file, but not in the module")
591 = ppr thing <+> ptext SLIT("has conflicting definitions in the module and its hs-boot file")
594 2 (ptext SLIT("is defined in the hs-boot file, but not in the module"))
598 %************************************************************************
600 Type-checking the top level of a module
602 %************************************************************************
604 tcRnGroup takes a bunch of top-level source-code declarations, and
606 * gets supporting declarations from interface files
609 * and augments the TcGblEnv with the results
611 In Template Haskell it may be called repeatedly for each group of
612 declarations. It expects there to be an incoming TcGblEnv in the
613 monad; it augments it and returns the new TcGblEnv.
616 tcRnGroup :: ModDetails -> HsGroup RdrName -> TcM (TcGblEnv, TcLclEnv)
617 -- Returns the variables free in the decls, for unused-binding reporting
618 tcRnGroup boot_details decls
619 = do { -- Rename the declarations
620 (tcg_env, rn_decls) <- rnTopSrcDecls decls ;
621 setGblEnv tcg_env $ do {
623 -- Typecheck the declarations
624 tcTopSrcDecls boot_details rn_decls
627 ------------------------------------------------
628 rnTopSrcDecls :: HsGroup RdrName -> TcM (TcGblEnv, HsGroup Name)
630 = do { -- Bring top level binders into scope
631 tcg_env <- importsFromLocalDecls group ;
632 setGblEnv tcg_env $ do {
634 failIfErrsM ; -- No point in continuing if (say) we have duplicate declarations
636 -- Rename the source decls
637 (tcg_env, rn_decls) <- rnSrcDecls group ;
640 -- save the renamed syntax, if we want it
642 | Just grp <- tcg_rn_decls tcg_env
643 = tcg_env{ tcg_rn_decls = Just (appendGroups grp rn_decls) }
647 -- Dump trace of renaming part
648 rnDump (ppr rn_decls) ;
650 return (tcg_env', rn_decls)
653 ------------------------------------------------
654 tcTopSrcDecls :: ModDetails -> HsGroup Name -> TcM (TcGblEnv, TcLclEnv)
655 tcTopSrcDecls boot_details
656 (HsGroup { hs_tyclds = tycl_decls,
657 hs_instds = inst_decls,
658 hs_fords = foreign_decls,
659 hs_defds = default_decls,
660 hs_ruleds = rule_decls,
661 hs_valds = val_binds })
662 = do { -- Type-check the type and class decls, and all imported decls
663 -- The latter come in via tycl_decls
664 traceTc (text "Tc2") ;
666 tcg_env <- checkNoErrs (tcTyAndClassDecls boot_details tycl_decls) ;
667 -- tcTyAndClassDecls recovers internally, but if anything gave rise to
668 -- an error we'd better stop now, to avoid a cascade
670 -- Make these type and class decls available to stuff slurped from interface files
671 writeMutVar (tcg_type_env_var tcg_env) (tcg_type_env tcg_env) ;
674 setGblEnv tcg_env $ do {
675 -- Source-language instances, including derivings,
676 -- and import the supporting declarations
677 traceTc (text "Tc3") ;
678 (tcg_env, inst_infos, deriv_binds) <- tcInstDecls1 tycl_decls inst_decls ;
679 setGblEnv tcg_env $ do {
681 -- Foreign import declarations next. No zonking necessary
682 -- here; we can tuck them straight into the global environment.
683 traceTc (text "Tc4") ;
684 (fi_ids, fi_decls) <- tcForeignImports foreign_decls ;
685 tcExtendGlobalValEnv fi_ids $ do {
687 -- Default declarations
688 traceTc (text "Tc4a") ;
689 default_tys <- tcDefaults default_decls ;
690 updGblEnv (\gbl -> gbl { tcg_default = default_tys }) $ do {
692 -- Value declarations next
693 -- We also typecheck any extra binds that came out
694 -- of the "deriving" process (deriv_binds)
695 traceTc (text "Tc5") ;
696 (tc_val_binds, lcl_env) <- tcTopBinds (val_binds ++ deriv_binds) ;
697 setLclTypeEnv lcl_env $ do {
699 -- Second pass over class and instance declarations,
700 traceTc (text "Tc6") ;
701 (tcl_env, inst_binds) <- tcInstDecls2 tycl_decls inst_infos ;
702 showLIE (text "after instDecls2") ;
705 -- They need to be zonked, so we return them
706 traceTc (text "Tc7") ;
707 (foe_binds, foe_decls) <- tcForeignExports foreign_decls ;
710 rules <- tcRules rule_decls ;
713 traceTc (text "Tc7a") ;
714 tcg_env <- getGblEnv ;
715 let { all_binds = tc_val_binds `unionBags`
716 inst_binds `unionBags`
719 -- Extend the GblEnv with the (as yet un-zonked)
720 -- bindings, rules, foreign decls
721 tcg_env' = tcg_env { tcg_binds = tcg_binds tcg_env `unionBags` all_binds,
722 tcg_rules = tcg_rules tcg_env ++ rules,
723 tcg_fords = tcg_fords tcg_env ++ foe_decls ++ fi_decls } } ;
724 return (tcg_env', lcl_env)
729 %************************************************************************
733 %************************************************************************
737 = do { ghci_mode <- getGhciMode ;
738 tcg_env <- getGblEnv ;
740 let { main_mod = case mainModIs dflags of {
741 Just mod -> mkModule mod ;
743 main_fn = case mainFunIs dflags of {
744 Just fn -> mkRdrUnqual (mkVarOcc (mkFastString fn)) ;
745 Nothing -> main_RDR_Unqual } } ;
747 check_main ghci_mode tcg_env main_mod main_fn
751 check_main ghci_mode tcg_env main_mod main_fn
752 -- If we are in module Main, check that 'main' is defined.
753 -- It may be imported from another module!
756 -- Blimey: a whole page of code to do this...
761 = addErrCtxt mainCtxt $
762 do { mb_main <- lookupSrcOcc_maybe main_fn
763 -- Check that 'main' is in scope
764 -- It might be imported from another module!
766 Nothing -> do { complain_no_main
769 { let { rhs = nlHsApp (nlHsVar runMainIOName) (nlHsVar main_name) }
770 -- :Main.main :: IO () = runMainIO main
772 ; (main_expr, ty) <- setSrcSpan (srcLocSpan (getSrcLoc main_name)) $
775 ; let { root_main_id = mkExportedLocalId rootMainName ty ;
776 main_bind = noLoc (VarBind root_main_id main_expr) }
778 ; return (tcg_env { tcg_binds = tcg_binds tcg_env
780 tcg_dus = tcg_dus tcg_env
781 `plusDU` usesOnly (unitFV main_name)
782 -- Record the use of 'main', so that we don't
783 -- complain about it being defined but not used
787 mod = tcg_mod tcg_env
789 complain_no_main | ghci_mode == Interactive = return ()
790 | otherwise = failWithTc noMainMsg
791 -- In interactive mode, don't worry about the absence of 'main'
792 -- In other modes, fail altogether, so that we don't go on
793 -- and complain a second time when processing the export list.
795 mainCtxt = ptext SLIT("When checking the type of the main function") <+> quotes (ppr main_fn)
796 noMainMsg = ptext SLIT("The main function") <+> quotes (ppr main_fn)
797 <+> ptext SLIT("is not defined in module") <+> quotes (ppr main_mod)
800 %*********************************************************
804 %*********************************************************
808 setInteractiveContext :: HscEnv -> InteractiveContext -> TcRn a -> TcRn a
809 setInteractiveContext hsc_env icxt thing_inside
811 -- Initialise the tcg_inst_env with instances
812 -- from all home modules. This mimics the more selective
813 -- call to hptInstances in tcRnModule
814 dfuns = hptInstances hsc_env (\mod -> True)
816 updGblEnv (\env -> env {
817 tcg_rdr_env = ic_rn_gbl_env icxt,
818 tcg_type_env = ic_type_env icxt,
819 tcg_inst_env = extendInstEnvList (tcg_inst_env env) dfuns }) $
821 updLclEnv (\env -> env { tcl_rdr = ic_rn_local_env icxt }) $
823 do { traceTc (text "setIC" <+> ppr (ic_type_env icxt))
830 -> InteractiveContext
832 -> IO (Maybe (InteractiveContext, [Name], LHsExpr Id))
833 -- The returned [Name] is the same as the input except for
834 -- ExprStmt, in which case the returned [Name] is [itName]
836 -- The returned TypecheckedHsExpr is of type IO [ () ],
837 -- a list of the bound values, coerced to ().
839 tcRnStmt hsc_env ictxt rdr_stmt
840 = initTcPrintErrors hsc_env iNTERACTIVE $
841 setInteractiveContext hsc_env ictxt $ do {
843 -- Rename; use CmdLineMode because tcRnStmt is only used interactively
844 (([rn_stmt], _), fvs) <- rnStmts DoExpr [rdr_stmt] (return ((), emptyFVs)) ;
845 traceRn (text "tcRnStmt" <+> vcat [ppr rdr_stmt, ppr rn_stmt, ppr fvs]) ;
848 -- The real work is done here
849 (bound_ids, tc_expr) <- tcUserStmt rn_stmt ;
851 traceTc (text "tcs 1") ;
852 let { -- (a) Make all the bound ids "global" ids, now that
853 -- they're notionally top-level bindings. This is
854 -- important: otherwise when we come to compile an expression
855 -- using these ids later, the byte code generator will consider
856 -- the occurrences to be free rather than global.
858 -- (b) Tidy their types; this is important, because :info may
859 -- ask to look at them, and :info expects the things it looks
860 -- up to have tidy types
861 global_ids = map globaliseAndTidy bound_ids ;
863 -- Update the interactive context
864 rn_env = ic_rn_local_env ictxt ;
865 type_env = ic_type_env ictxt ;
867 bound_names = map idName global_ids ;
868 new_rn_env = extendLocalRdrEnv rn_env bound_names ;
870 -- Remove any shadowed bindings from the type_env;
871 -- they are inaccessible but might, I suppose, cause
872 -- a space leak if we leave them there
873 shadowed = [ n | name <- bound_names,
874 let rdr_name = mkRdrUnqual (nameOccName name),
875 Just n <- [lookupLocalRdrEnv rn_env rdr_name] ] ;
877 filtered_type_env = delListFromNameEnv type_env shadowed ;
878 new_type_env = extendTypeEnvWithIds filtered_type_env global_ids ;
880 new_ic = ictxt { ic_rn_local_env = new_rn_env,
881 ic_type_env = new_type_env }
884 dumpOptTcRn Opt_D_dump_tc
885 (vcat [text "Bound Ids" <+> pprWithCommas ppr global_ids,
886 text "Typechecked expr" <+> ppr tc_expr]) ;
888 returnM (new_ic, bound_names, tc_expr)
891 globaliseAndTidy :: Id -> Id
893 -- Give the Id a Global Name, and tidy its type
894 = setIdType (globaliseId VanillaGlobal id) tidy_type
896 tidy_type = tidyTopType (idType id)
899 Here is the grand plan, implemented in tcUserStmt
901 What you type The IO [HValue] that hscStmt returns
902 ------------- ------------------------------------
903 let pat = expr ==> let pat = expr in return [coerce HVal x, coerce HVal y, ...]
906 pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...]
909 expr (of IO type) ==> expr >>= \ it -> return [coerce HVal it]
910 [NB: result not printed] bindings: [it]
912 expr (of non-IO type, ==> let it = expr in print it >> return [coerce HVal it]
913 result showable) bindings: [it]
915 expr (of non-IO type,
916 result not showable) ==> error
920 ---------------------------
921 tcUserStmt :: LStmt Name -> TcM ([Id], LHsExpr Id)
922 tcUserStmt (L loc (ExprStmt expr _ _))
923 = newUnique `thenM` \ uniq ->
925 fresh_it = itName uniq
926 the_bind = noLoc $ FunBind (noLoc fresh_it) False
927 (mkMatchGroup [mkSimpleMatch [] expr])
929 tryTcLIE_ (do { -- Try this if the other fails
930 traceTc (text "tcs 1b") ;
931 tc_stmts (map (L loc) [
932 LetStmt [HsBindGroup (unitBag the_bind) [] NonRecursive],
933 ExprStmt (nlHsApp (nlHsVar printName) (nlHsVar fresh_it))
934 (HsVar thenIOName) placeHolderType
936 (do { -- Try this first
937 traceTc (text "tcs 1a") ;
938 tc_stmts [L loc (BindStmt (nlVarPat fresh_it) expr
939 (HsVar bindIOName) noSyntaxExpr) ] })
941 tcUserStmt stmt = tc_stmts [stmt]
943 ---------------------------
944 tc_stmts :: [LStmt Name] -> TcM ([Id], LHsExpr Id)
946 = do { ioTyCon <- tcLookupTyCon ioTyConName ;
948 ret_ty = mkListTy unitTy ;
949 io_ret_ty = mkTyConApp ioTyCon [ret_ty] ;
951 names = map unLoc (collectLStmtsBinders stmts) ;
953 -- mk_return builds the expression
954 -- returnIO @ [()] [coerce () x, .., coerce () z]
956 -- Despite the inconvenience of building the type applications etc,
957 -- this *has* to be done in type-annotated post-typecheck form
958 -- because we are going to return a list of *polymorphic* values
959 -- coerced to type (). If we built a *source* stmt
960 -- return [coerce x, ..., coerce z]
961 -- then the type checker would instantiate x..z, and we wouldn't
962 -- get their *polymorphic* values. (And we'd get ambiguity errs
963 -- if they were overloaded, since they aren't applied to anything.)
964 mk_return ret_id ids = nlHsApp (noLoc $ TyApp (nlHsVar ret_id) [ret_ty])
965 (noLoc $ ExplicitList unitTy (map mk_item ids)) ;
966 mk_item id = nlHsApp (noLoc $ TyApp (nlHsVar unsafeCoerceId) [idType id, unitTy])
969 io_ty = mkTyConApp ioTyCon []
972 -- OK, we're ready to typecheck the stmts
973 traceTc (text "tcs 2") ;
974 ((ids, tc_expr), lie) <- getLIE $ do {
975 (tc_stmts, ids) <- tcStmts DoExpr (tcDoStmt io_ty io_ret_ty) stmts $
977 -- Look up the names right in the middle,
978 -- where they will all be in scope
979 ids <- mappM tcLookupId names ;
982 ret_id <- tcLookupId returnIOName ; -- return @ IO
983 return (ids, noLoc (HsDo DoExpr tc_stmts (mk_return ret_id ids) io_ret_ty))
986 -- Simplify the context right here, so that we fail
987 -- if there aren't enough instances. Notably, when we see
989 -- we use recoverTc_ to try it <- e
990 -- and then let it = e
991 -- It's the simplify step that rejects the first.
992 traceTc (text "tcs 3") ;
993 const_binds <- tcSimplifyInteractive lie ;
995 -- Build result expression and zonk it
996 let { expr = mkHsLet const_binds tc_expr } ;
997 zonked_expr <- zonkTopLExpr expr ;
998 zonked_ids <- zonkTopBndrs ids ;
1000 -- None of the Ids should be of unboxed type, because we
1001 -- cast them all to HValues in the end!
1002 mappM bad_unboxed (filter (isUnLiftedType . idType) zonked_ids) ;
1004 return (zonked_ids, zonked_expr)
1007 bad_unboxed id = addErr (sep [ptext SLIT("GHCi can't bind a variable of unlifted type:"),
1008 nest 2 (ppr id <+> dcolon <+> ppr (idType id))])
1012 tcRnExpr just finds the type of an expression
1016 -> InteractiveContext
1019 tcRnExpr hsc_env ictxt rdr_expr
1020 = initTcPrintErrors hsc_env iNTERACTIVE $
1021 setInteractiveContext hsc_env ictxt $ do {
1023 (rn_expr, fvs) <- rnLExpr rdr_expr ;
1026 -- Now typecheck the expression;
1027 -- it might have a rank-2 type (e.g. :t runST)
1028 ((tc_expr, res_ty), lie) <- getLIE (tcInferRho rn_expr) ;
1029 ((qtvs, _, dict_ids), lie_top) <- getLIE (tcSimplifyInfer smpl_doc (tyVarsOfType res_ty) lie) ;
1030 tcSimplifyInteractive lie_top ;
1031 qtvs' <- mappM zonkQuantifiedTyVar qtvs ;
1033 let { all_expr_ty = mkForAllTys qtvs' $
1034 mkFunTys (map idType dict_ids) $
1036 zonkTcType all_expr_ty
1039 smpl_doc = ptext SLIT("main expression")
1042 tcRnType just finds the kind of a type
1046 -> InteractiveContext
1049 tcRnType hsc_env ictxt rdr_type
1050 = initTcPrintErrors hsc_env iNTERACTIVE $
1051 setInteractiveContext hsc_env ictxt $ do {
1053 rn_type <- rnLHsType doc rdr_type ;
1056 -- Now kind-check the type
1057 (ty', kind) <- kcHsType rn_type ;
1061 doc = ptext SLIT("In GHCi input")
1067 %************************************************************************
1069 More GHCi stuff, to do with browsing and getting info
1071 %************************************************************************
1075 getModuleExports :: HscEnv -> Module -> IO (Maybe NameSet)
1076 getModuleExports hsc_env mod
1077 = initTcPrintErrors hsc_env iNTERACTIVE (tcGetModuleExports mod)
1079 tcGetModuleExports :: Module -> TcM NameSet
1080 tcGetModuleExports mod = do
1081 iface <- load_iface mod
1082 loadOrphanModules (dep_orphs (mi_deps iface))
1083 -- Load any orphan-module interfaces,
1084 -- so their instances are visible
1085 ifaceExportNames (mi_exports iface)
1087 mkExportEnv :: HscEnv -> [Module] -- Expose these modules' exports only
1089 mkExportEnv hsc_env exports
1090 = do { mb_envs <- initTcPrintErrors hsc_env iNTERACTIVE $
1091 mappM getModuleExportRdrEnv exports
1093 Just envs -> return (foldr plusGlobalRdrEnv emptyGlobalRdrEnv envs)
1094 Nothing -> return emptyGlobalRdrEnv
1095 -- Some error; initTc will have printed it
1098 getModuleExportRdrEnv :: Module -> TcM GlobalRdrEnv
1099 getModuleExportRdrEnv mod = do
1100 names <- tcGetModuleExports mod
1101 let gres = [ GRE { gre_name = name, gre_prov = vanillaProv mod }
1102 | name <- nameSetToList names ]
1103 returnM (mkGlobalRdrEnv gres)
1105 vanillaProv :: Module -> Provenance
1106 -- We're building a GlobalRdrEnv as if the user imported
1107 -- all the specified modules into the global interactive module
1108 vanillaProv mod = Imported [ImportSpec { is_mod = mod, is_as = mod,
1109 is_qual = False, is_explicit = False,
1110 is_loc = srcLocSpan interactiveSrcLoc }]
1117 -> Module -- Module to inspect
1118 -> Bool -- Grab just the exports, or the whole toplev
1119 -> IO (Maybe [IfaceDecl])
1121 getModuleContents hsc_env mod exports_only
1122 = initTcPrintErrors hsc_env iNTERACTIVE (get_mod_contents exports_only)
1124 get_mod_contents exports_only
1125 | not exports_only -- We want the whole top-level type env
1126 -- so it had better be a home module
1127 = do { hpt <- getHpt
1128 ; case lookupModuleEnv hpt mod of
1129 Just mod_info -> return (map (toIfaceDecl ext_nm) $
1132 md_types (hm_details mod_info))
1133 Nothing -> ghcError (ProgramError (showSDoc (noRdrEnvErr mod)))
1134 -- This is a system error; the module should be in the HPT
1137 | otherwise -- Want the exports only
1138 = do { iface <- load_iface mod
1139 ; mappM get_decl [ (mod,avail) | (mod, avails) <- mi_exports iface
1143 get_decl (mod, avail)
1144 = do { main_name <- lookupOrig mod (availName avail)
1145 ; thing <- tcLookupGlobal main_name
1146 ; return (filter_decl (availNames avail) (toIfaceDecl ext_nm thing)) }
1148 ext_nm = interactiveExtNameFun (icPrintUnqual (hsc_IC hsc_env))
1150 ---------------------
1151 filter_decl occs decl@(IfaceClass {ifSigs = sigs})
1152 = decl { ifSigs = filter (keep_sig occs) sigs }
1153 filter_decl occs decl@(IfaceData {ifCons = IfDataTyCon cons})
1154 = decl { ifCons = IfDataTyCon (filter (keep_con occs) cons) }
1155 filter_decl occs decl@(IfaceData {ifCons = IfNewTyCon con})
1156 | keep_con occs con = decl
1157 | otherwise = decl {ifCons = IfAbstractTyCon} -- Hmm?
1158 filter_decl occs decl
1161 keep_sig occs (IfaceClassOp occ _ _) = occ `elem` occs
1162 keep_con occs con = ifConOcc con `elem` occs
1164 wantToSee (AnId id) = not (isImplicitId id)
1165 wantToSee (ADataCon _) = False -- They'll come via their TyCon
1168 ---------------------
1169 load_iface mod = loadSrcInterface doc mod False {- Not boot iface -}
1171 doc = ptext SLIT("context for compiling statements")
1173 ---------------------
1174 noRdrEnvErr mod = ptext SLIT("No top-level environment available for module")
1175 <+> quotes (ppr mod)
1179 type GetInfoResult = (String, IfaceDecl, Fixity, SrcLoc,
1180 [(IfaceType,SrcLoc)] -- Instances
1183 tcRnLookupRdrName :: HscEnv -> RdrName -> IO (Maybe [Name])
1185 tcRnLookupRdrName hsc_env rdr_name
1186 = initTcPrintErrors hsc_env iNTERACTIVE $
1187 setInteractiveContext hsc_env (hsc_IC hsc_env) $
1188 lookup_rdr_name rdr_name
1191 lookup_rdr_name rdr_name = do {
1192 -- If the identifier is a constructor (begins with an
1193 -- upper-case letter), then we need to consider both
1194 -- constructor and type class identifiers.
1195 let { rdr_names = dataTcOccs rdr_name } ;
1197 -- results :: [(Messages, Maybe Name)]
1198 results <- mapM (tryTc . lookupOccRn) rdr_names ;
1200 traceRn (text "xx" <+> vcat [ppr rdr_names, ppr (map snd results)]);
1201 -- The successful lookups will be (Just name)
1202 let { (warns_s, good_names) = unzip [ (msgs, name)
1203 | (msgs, Just name) <- results] ;
1204 errs_s = [msgs | (msgs, Nothing) <- results] } ;
1206 -- Fail if nothing good happened, else add warnings
1207 if null good_names then
1208 -- No lookup succeeded, so
1209 -- pick the first error message and report it
1210 -- ToDo: If one of the errors is "could be Foo.X or Baz.X",
1211 -- while the other is "X is not in scope",
1212 -- we definitely want the former; but we might pick the latter
1213 do { addMessages (head errs_s) ; failM }
1214 else -- Add deprecation warnings
1215 mapM_ addMessages warns_s ;
1221 tcRnGetInfo :: HscEnv
1222 -> InteractiveContext
1224 -> IO (Maybe [GetInfoResult])
1226 -- Used to implemnent :info in GHCi
1228 -- Look up a RdrName and return all the TyThings it might be
1229 -- A capitalised RdrName is given to us in the DataName namespace,
1230 -- but we want to treat it as *both* a data constructor
1231 -- *and* as a type or class constructor;
1232 -- hence the call to dataTcOccs, and we return up to two results
1233 tcRnGetInfo hsc_env ictxt rdr_name
1234 = initTcPrintErrors hsc_env iNTERACTIVE $
1235 setInteractiveContext hsc_env ictxt $ do {
1237 -- Load the interface for all unqualified types and classes
1238 -- That way we will find all the instance declarations
1239 -- (Packages have not orphan modules, and we assume that
1240 -- in the home package all relevant modules are loaded.)
1241 loadUnqualIfaces ictxt ;
1243 good_names <- lookup_rdr_name rdr_name ;
1245 -- And lookup up the entities, avoiding duplicates, which arise
1246 -- because constructors and record selectors are represented by
1247 -- their parent declaration
1248 let { do_one name = do { thing <- tcLookupGlobal name
1249 ; fixity <- lookupFixityRn name
1250 ; ispecs <- lookupInsts print_unqual thing
1251 ; return (str, toIfaceDecl ext_nm thing, fixity,
1253 [(toIfaceType ext_nm (idType dfun), getSrcLoc dfun)
1254 | dfun <- map instanceDFunId ispecs ]
1257 -- str is the the naked occurrence name
1258 -- after stripping off qualification and parens (+)
1259 str = occNameUserString (nameOccName name)
1262 -- For the SrcLoc, the 'thing' has better info than
1263 -- the 'name' because getting the former forced the
1264 -- declaration to be loaded into the cache
1266 results <- mapM do_one good_names ;
1267 return (fst (removeDups cmp results))
1270 cmp (_,d1,_,_,_) (_,d2,_,_,_) = ifName d1 `compare` ifName d2
1271 ext_nm = interactiveExtNameFun print_unqual
1272 print_unqual = icPrintUnqual ictxt
1274 lookupInsts :: PrintUnqualified -> TyThing -> TcM [Instance]
1275 -- Filter the instances by the ones whose tycons (or clases resp)
1276 -- are in scope unqualified. Otherwise we list a whole lot too many!
1277 lookupInsts print_unqual (AClass cls)
1278 = do { inst_envs <- tcGetInstEnvs
1280 | ispec <- classInstances inst_envs cls
1281 , plausibleDFun print_unqual (instanceDFunId ispec) ] }
1283 lookupInsts print_unqual (ATyCon tc)
1284 = do { eps <- getEps -- Load all instances for all classes that are
1285 -- in the type environment (which are all the ones
1286 -- we've seen in any interface file so far)
1287 ; (pkg_ie, home_ie) <- tcGetInstEnvs -- Search all
1289 | ispec <- instEnvElts home_ie ++ instEnvElts pkg_ie
1290 , let dfun = instanceDFunId ispec
1292 , plausibleDFun print_unqual dfun ] }
1294 relevant df = tc_name `elemNameSet` tyClsNamesOfDFunHead (idType df)
1295 tc_name = tyConName tc
1297 lookupInsts print_unqual other = return []
1299 plausibleDFun print_unqual dfun -- Dfun involving only names that print unqualified
1300 = all ok (nameSetToList (tyClsNamesOfType (idType dfun)))
1302 ok name | isExternalName name = print_unqual (nameModule name) (nameOccName name)
1305 toIfaceDecl :: (Name -> IfaceExtName) -> TyThing -> IfaceDecl
1306 toIfaceDecl ext_nm thing
1307 = tyThingToIfaceDecl ext_nm (munge thing)
1309 -- munge transforms a thing to its "parent" thing
1310 munge (ADataCon dc) = ATyCon (dataConTyCon dc)
1311 munge (AnId id) = case globalIdDetails id of
1312 RecordSelId tc lbl -> ATyCon tc
1313 ClassOpId cls -> AClass cls
1315 munge other_thing = other_thing
1317 loadUnqualIfaces :: InteractiveContext -> TcM ()
1318 -- Load the home module for everything that is in scope unqualified
1319 -- This is so that we can accurately report the instances for
1321 loadUnqualIfaces ictxt
1323 mapM_ (loadSysInterface doc) (moduleSetElts (mkModuleSet unqual_mods))
1325 unqual_mods = [ nameModule name
1326 | gre <- globalRdrEnvElts (ic_rn_gbl_env ictxt),
1327 let name = gre_name gre,
1328 isTcOcc (nameOccName name), -- Types and classes only
1329 unQualOK gre ] -- In scope unqualified
1330 doc = ptext SLIT("Need interface for module whose export(s) are in scope unqualified")
1334 %************************************************************************
1338 %************************************************************************
1341 rnDump :: SDoc -> TcRn ()
1342 -- Dump, with a banner, if -ddump-rn
1343 rnDump doc = do { dumpOptTcRn Opt_D_dump_rn (mkDumpDoc "Renamer" doc) }
1345 tcDump :: TcGblEnv -> TcRn ()
1347 = do { dflags <- getDOpts ;
1349 -- Dump short output if -ddump-types or -ddump-tc
1350 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1351 (dumpTcRn short_dump) ;
1353 -- Dump bindings if -ddump-tc
1354 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump)
1357 short_dump = pprTcGblEnv env
1358 full_dump = pprLHsBinds (tcg_binds env)
1359 -- NB: foreign x-d's have undefined's in their types;
1360 -- hence can't show the tc_fords
1363 = do { dflags <- getDOpts ;
1364 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1365 (dumpTcRn (pprModGuts mod_guts)) ;
1367 -- Dump bindings if -ddump-tc
1368 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump) }
1370 full_dump = pprCoreBindings (mg_binds mod_guts)
1372 -- It's unpleasant having both pprModGuts and pprModDetails here
1373 pprTcGblEnv :: TcGblEnv -> SDoc
1374 pprTcGblEnv (TcGblEnv { tcg_type_env = type_env,
1375 tcg_insts = dfun_ids,
1377 tcg_imports = imports })
1378 = vcat [ ppr_types dfun_ids type_env
1379 , ppr_insts dfun_ids
1380 , vcat (map ppr rules)
1381 , ppr_gen_tycons (typeEnvTyCons type_env)
1382 , ptext SLIT("Dependent modules:") <+> ppr (moduleEnvElts (imp_dep_mods imports))
1383 , ptext SLIT("Dependent packages:") <+> ppr (imp_dep_pkgs imports)]
1385 pprModGuts :: ModGuts -> SDoc
1386 pprModGuts (ModGuts { mg_types = type_env,
1388 = vcat [ ppr_types [] type_env,
1392 ppr_types :: [Instance] -> TypeEnv -> SDoc
1393 ppr_types ispecs type_env
1394 = text "TYPE SIGNATURES" $$ nest 4 (ppr_sigs ids)
1396 dfun_ids = map instanceDFunId ispecs
1397 ids = [id | id <- typeEnvIds type_env, want_sig id]
1398 want_sig id | opt_PprStyle_Debug = True
1399 | otherwise = isLocalId id &&
1400 isExternalName (idName id) &&
1401 not (id `elem` dfun_ids)
1402 -- isLocalId ignores data constructors, records selectors etc.
1403 -- The isExternalName ignores local dictionary and method bindings
1404 -- that the type checker has invented. Top-level user-defined things
1405 -- have External names.
1407 ppr_insts :: [Instance] -> SDoc
1408 ppr_insts [] = empty
1409 ppr_insts ispecs = text "INSTANCES" $$ nest 2 (pprInstances ispecs)
1411 ppr_sigs :: [Var] -> SDoc
1413 -- Print type signatures; sort by OccName
1414 = vcat (map ppr_sig (sortLe le_sig ids))
1416 le_sig id1 id2 = getOccName id1 <= getOccName id2
1417 ppr_sig id = ppr id <+> dcolon <+> ppr (tidyTopType (idType id))
1419 ppr_rules :: [CoreRule] -> SDoc
1420 ppr_rules [] = empty
1421 ppr_rules rs = vcat [ptext SLIT("{-# RULES"),
1422 nest 4 (pprRules rs),
1425 ppr_gen_tycons [] = empty
1426 ppr_gen_tycons tcs = vcat [ptext SLIT("Tycons with generics:"),
1427 nest 2 (fsep (map ppr (filter tyConHasGenerics tcs)))]