2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[TcModule]{Typechecking a whole module}
9 mkExportEnv, getModuleContents, tcRnStmt,
10 tcRnGetInfo, GetInfoResult,
19 #include "HsVersions.h"
23 import {-# SOURCE #-} TcSplice ( tcSpliceDecls )
26 import DynFlags ( DynFlag(..), DynFlags(..), dopt, GhcMode(..) )
27 import StaticFlags ( opt_PprStyle_Debug )
28 import Packages ( moduleToPackageConfig, mkPackageId, package,
30 import HsSyn ( HsModule(..), HsExtCore(..), HsGroup(..), LHsDecl,
31 SpliceDecl(..), HsBind(..), LHsBinds,
32 emptyGroup, appendGroups,
33 nlHsApp, nlHsVar, pprLHsBinds )
34 import RdrHsSyn ( findSplice )
36 import PrelNames ( runMainIOName, rootMainName, mAIN,
38 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 )
92 import RnSource ( addTcgDUs )
93 import TcHsSyn ( mkHsLet, zonkTopLExpr, zonkTopBndrs )
94 import TcHsType ( kcHsType )
95 import TcMType ( zonkTcType, zonkQuantifiedTyVar )
96 import TcMatches ( tcStmts, tcDoStmt )
97 import TcSimplify ( tcSimplifyInteractive, tcSimplifyInfer )
98 import TcType ( Type, mkForAllTys, mkFunTys, mkTyConApp, tyVarsOfType,
99 isUnLiftedType, tyClsNamesOfDFunHead, tyClsNamesOfType )
100 import TcEnv ( tcLookupTyCon, tcLookupId, tcLookupGlobal )
101 import RnTypes ( rnLHsType )
102 import Inst ( tcGetInstEnvs )
103 import InstEnv ( classInstances, instEnvElts )
104 import RnExpr ( rnStmts, rnLExpr )
105 import LoadIface ( loadSrcInterface, loadSysInterface )
106 import IfaceSyn ( IfaceDecl(..), IfaceClassOp(..), IfaceConDecl(..),
107 IfaceExtName(..), IfaceConDecls(..),
109 import IfaceType ( IfaceType, toIfaceType,
110 interactiveExtNameFun )
111 import IfaceEnv ( lookupOrig, ifaceExportNames )
112 import Module ( lookupModuleEnv, moduleSetElts, mkModuleSet )
113 import RnEnv ( lookupOccRn, dataTcOccs, lookupFixityRn )
114 import Id ( isImplicitId, setIdType, globalIdDetails )
115 import MkId ( unsafeCoerceId )
116 import DataCon ( dataConTyCon )
117 import TyCon ( tyConName )
118 import TysWiredIn ( mkListTy, unitTy )
119 import IdInfo ( GlobalIdDetails(..) )
120 import SrcLoc ( interactiveSrcLoc, unLoc )
122 import Var ( globaliseId )
123 import Name ( nameOccName, nameModule )
124 import OccName ( occNameUserString, isTcOcc )
125 import NameEnv ( delListFromNameEnv )
126 import PrelNames ( iNTERACTIVE, ioTyConName, printName, itName,
127 bindIOName, thenIOName, returnIOName )
128 import HscTypes ( InteractiveContext(..), HomeModInfo(..),
129 availNames, availName, ModIface(..), icPrintUnqual,
131 import BasicTypes ( RecFlag(..), Fixity )
132 import ListSetOps ( removeDups )
133 import Panic ( ghcError, GhcException(..) )
134 import SrcLoc ( SrcLoc )
137 import FastString ( mkFastString )
138 import Util ( sortLe )
139 import Bag ( unionBags, snocBag, emptyBag, unitBag, unionManyBags )
141 import Maybe ( isJust )
146 %************************************************************************
148 Typecheck and rename a module
150 %************************************************************************
156 -> Bool -- True <=> save renamed syntax
157 -> Located (HsModule RdrName)
158 -> IO (Messages, Maybe TcGblEnv)
160 tcRnModule hsc_env hsc_src save_rn_decls
161 (L loc (HsModule maybe_mod export_ies
162 import_decls local_decls mod_deprec))
163 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
165 let { this_mod = case maybe_mod of
166 Nothing -> mAIN -- 'module M where' is omitted
167 Just (L _ mod) -> mod } ; -- The normal case
169 initTc hsc_env hsc_src this_mod $
172 checkForPackageModule (hsc_dflags hsc_env) this_mod;
174 -- Deal with imports; sets tcg_rdr_env, tcg_imports
175 (rdr_env, imports) <- rnImports import_decls ;
177 let { dep_mods :: ModuleEnv (Module, IsBootInterface)
178 ; dep_mods = imp_dep_mods imports
180 -- We want instance declarations from all home-package
181 -- modules below this one, including boot modules, except
182 -- ourselves. The 'except ourselves' is so that we don't
183 -- get the instances from this module's hs-boot file
184 ; want_instances :: Module -> Bool
185 ; want_instances mod = mod `elemModuleEnv` dep_mods
187 ; home_insts = hptInstances hsc_env want_instances
190 -- Record boot-file info in the EPS, so that it's
191 -- visible to loadHiBootInterface in tcRnSrcDecls,
192 -- and any other incrementally-performed imports
193 updateEps_ (\eps -> eps { eps_is_boot = dep_mods }) ;
195 -- Update the gbl env
197 gbl { tcg_rdr_env = rdr_env,
198 tcg_inst_env = extendInstEnvList (tcg_inst_env gbl) home_insts,
199 tcg_imports = tcg_imports gbl `plusImportAvails` imports,
200 tcg_rn_decls = if save_rn_decls then
206 traceRn (text "rn1" <+> ppr (imp_dep_mods imports)) ;
207 -- Fail if there are any errors so far
208 -- The error printing (if needed) takes advantage
209 -- of the tcg_env we have now set
212 -- Load any orphan-module interfaces, so that
213 -- their rules and instance decls will be found
214 loadOrphanModules (imp_orphs imports) ;
216 traceRn (text "rn1a") ;
217 -- Rename and type check the declarations
218 tcg_env <- if isHsBoot hsc_src then
219 tcRnHsBootDecls local_decls
221 tcRnSrcDecls local_decls ;
222 setGblEnv tcg_env $ do {
224 traceRn (text "rn3") ;
226 -- Report the use of any deprecated things
227 -- We do this before processsing the export list so
228 -- that we don't bleat about re-exporting a deprecated
229 -- thing (especially via 'module Foo' export item)
230 -- Only uses in the body of the module are complained about
231 reportDeprecations tcg_env ;
233 -- Process the export list
234 exports <- exportsFromAvail (isJust maybe_mod) export_ies ;
236 -- Check whether the entire module is deprecated
237 -- This happens only once per module
238 let { mod_deprecs = checkModDeprec mod_deprec } ;
240 -- Add exports and deprecations to envt
241 let { final_env = tcg_env { tcg_exports = exports,
242 tcg_dus = tcg_dus tcg_env `plusDU` usesOnly exports,
243 tcg_deprecs = tcg_deprecs tcg_env `plusDeprecs`
245 -- A module deprecation over-rides the earlier ones
248 -- Report unused names
249 reportUnusedNames export_ies final_env ;
251 -- Dump output and return
256 -- This is really a sanity check that the user has given -package-name
257 -- if necessary. -package-name is only necessary when the package database
258 -- already contains the current package, because then we can't tell
259 -- whether a given module is in the current package or not, without knowing
260 -- the name of the current package.
261 checkForPackageModule dflags this_mod
262 | not (isHomeModule dflags this_mod),
263 Just (pkg,_) <- moduleToPackageConfig dflags this_mod =
265 ppr_pkg = ppr (mkPackageId (package pkg))
267 addErr (ptext SLIT("Module") <+> quotes (ppr this_mod) <+>
268 ptext SLIT("is a member of package") <+> ppr_pkg <> char '.' $$
269 ptext SLIT("To compile this module, please use -ignore-package") <+> ppr_pkg <> char '.')
270 | otherwise = return ()
274 %************************************************************************
276 Type-checking external-core modules
278 %************************************************************************
281 tcRnExtCore :: HscEnv
283 -> IO (Messages, Maybe ModGuts)
284 -- Nothing => some error occurred
286 tcRnExtCore hsc_env (HsExtCore this_mod decls src_binds)
287 -- The decls are IfaceDecls; all names are original names
288 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
290 initTc hsc_env ExtCoreFile this_mod $ do {
292 let { ldecls = map noLoc decls } ;
294 -- Deal with the type declarations; first bring their stuff
295 -- into scope, then rname them, then type check them
296 (rdr_env, imports) <- importsFromLocalDecls (mkFakeGroup ldecls) ;
298 updGblEnv (\gbl -> gbl { tcg_rdr_env = rdr_env `plusGlobalRdrEnv` tcg_rdr_env gbl,
299 tcg_imports = imports `plusImportAvails` tcg_imports gbl })
302 rn_decls <- rnTyClDecls ldecls ;
305 -- Dump trace of renaming part
306 rnDump (ppr rn_decls) ;
308 -- Typecheck them all together so that
309 -- any mutually recursive types are done right
310 tcg_env <- checkNoErrs (tcTyAndClassDecls emptyModDetails rn_decls) ;
311 -- Make the new type env available to stuff slurped from interface files
313 setGblEnv tcg_env $ do {
315 -- Now the core bindings
316 core_binds <- initIfaceExtCore (tcExtCoreBindings src_binds) ;
320 bndrs = bindersOfBinds core_binds ;
321 my_exports = mkNameSet (map idName bndrs) ;
322 -- ToDo: export the data types also?
324 final_type_env = extendTypeEnvWithIds (tcg_type_env tcg_env) bndrs ;
326 mod_guts = ModGuts { mg_module = this_mod,
328 mg_usages = [], -- ToDo: compute usage
329 mg_dir_imps = [], -- ??
330 mg_deps = noDependencies, -- ??
331 mg_exports = my_exports,
332 mg_types = final_type_env,
333 mg_insts = tcg_insts tcg_env,
335 mg_binds = core_binds,
338 mg_rdr_env = emptyGlobalRdrEnv,
339 mg_fix_env = emptyFixityEnv,
340 mg_deprecs = NoDeprecs,
344 tcCoreDump mod_guts ;
349 mkFakeGroup decls -- Rather clumsy; lots of unused fields
350 = HsGroup { hs_tyclds = decls, -- This is the one we want
351 hs_valds = [], hs_fords = [],
352 hs_instds = [], hs_fixds = [], hs_depds = [],
353 hs_ruleds = [], hs_defds = [] }
357 %************************************************************************
359 Type-checking the top level of a module
361 %************************************************************************
364 tcRnSrcDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
365 -- Returns the variables free in the decls
366 -- Reason: solely to report unused imports and bindings
368 = do { -- Load the hi-boot interface for this module, if any
369 -- We do this now so that the boot_names can be passed
370 -- to tcTyAndClassDecls, because the boot_names are
371 -- automatically considered to be loop breakers
373 boot_iface <- tcHiBootIface mod ;
375 -- Do all the declarations
376 (tc_envs, lie) <- getLIE (tc_rn_src_decls boot_iface decls) ;
378 -- tcSimplifyTop deals with constant or ambiguous InstIds.
379 -- How could there be ambiguous ones? They can only arise if a
380 -- top-level decl falls under the monomorphism
381 -- restriction, and no subsequent decl instantiates its
382 -- type. (Usually, ambiguous type variables are resolved
383 -- during the generalisation step.)
384 traceTc (text "Tc8") ;
385 inst_binds <- setEnvs tc_envs (tcSimplifyTop lie) ;
386 -- Setting the global env exposes the instances to tcSimplifyTop
387 -- Setting the local env exposes the local Ids to tcSimplifyTop,
388 -- so that we get better error messages (monomorphism restriction)
390 -- Backsubstitution. This must be done last.
391 -- Even tcSimplifyTop may do some unification.
392 traceTc (text "Tc9") ;
393 let { (tcg_env, _) = tc_envs ;
394 TcGblEnv { tcg_type_env = type_env, tcg_binds = binds,
395 tcg_rules = rules, tcg_fords = fords } = tcg_env } ;
397 (bind_ids, binds', fords', rules') <- zonkTopDecls (binds `unionBags` inst_binds)
400 let { final_type_env = extendTypeEnvWithIds type_env bind_ids
401 ; tcg_env' = tcg_env { tcg_type_env = final_type_env,
404 tcg_fords = fords' } } ;
406 -- Make the new type env available to stuff slurped from interface files
407 writeMutVar (tcg_type_env_var tcg_env) final_type_env ;
409 -- Compare the hi-boot iface (if any) with the real thing
410 dfun_binds <- checkHiBootIface tcg_env' boot_iface ;
412 return (tcg_env' { tcg_binds = tcg_binds tcg_env' `unionBags` dfun_binds })
415 tc_rn_src_decls :: ModDetails -> [LHsDecl RdrName] -> TcM (TcGblEnv, TcLclEnv)
416 -- Loops around dealing with each top level inter-splice group
417 -- in turn, until it's dealt with the entire module
418 tc_rn_src_decls boot_details ds
419 = do { let { (first_group, group_tail) = findSplice ds } ;
420 -- If ds is [] we get ([], Nothing)
422 -- Type check the decls up to, but not including, the first splice
423 tc_envs@(tcg_env,tcl_env) <- tcRnGroup boot_details first_group ;
425 -- Bale out if errors; for example, error recovery when checking
426 -- the RHS of 'main' can mean that 'main' is not in the envt for
427 -- the subsequent checkMain test
432 -- If there is no splice, we're nearly done
434 Nothing -> do { -- Last thing: check for `main'
435 tcg_env <- checkMain ;
436 return (tcg_env, tcl_env)
439 -- If there's a splice, we must carry on
440 Just (SpliceDecl splice_expr, rest_ds) -> do {
442 failWithTc (text "Can't do a top-level splice; need a bootstrapped compiler")
445 -- Rename the splice expression, and get its supporting decls
446 (rn_splice_expr, splice_fvs) <- rnLExpr splice_expr ;
447 failIfErrsM ; -- Don't typecheck if renaming failed
449 -- Execute the splice
450 spliced_decls <- tcSpliceDecls rn_splice_expr ;
452 -- Glue them on the front of the remaining decls and loop
453 setGblEnv (tcg_env `addTcgDUs` usesOnly splice_fvs) $
454 tc_rn_src_decls boot_details (spliced_decls ++ rest_ds)
459 %************************************************************************
461 Compiling hs-boot source files, and
462 comparing the hi-boot interface with the real thing
464 %************************************************************************
467 tcRnHsBootDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
468 tcRnHsBootDecls decls
469 = do { let { (first_group, group_tail) = findSplice decls }
472 Just stuff -> spliceInHsBootErr stuff
475 -- Rename the declarations
476 ; (tcg_env, rn_group) <- rnTopSrcDecls first_group
477 ; setGblEnv tcg_env $ do {
479 -- Todo: check no foreign decls, no rules, no default decls
481 -- Typecheck type/class decls
482 ; traceTc (text "Tc2")
483 ; let tycl_decls = hs_tyclds rn_group
484 ; tcg_env <- checkNoErrs (tcTyAndClassDecls emptyModDetails tycl_decls)
485 ; setGblEnv tcg_env $ do {
487 -- Typecheck instance decls
488 ; traceTc (text "Tc3")
489 ; (tcg_env, inst_infos, _binds) <- tcInstDecls1 tycl_decls (hs_instds rn_group)
490 ; setGblEnv tcg_env $ do {
492 -- Typecheck value declarations
493 ; traceTc (text "Tc5")
494 ; val_ids <- tcHsBootSigs (hs_valds rn_group)
497 -- No simplification or zonking to do
498 ; traceTc (text "Tc7a")
499 ; gbl_env <- getGblEnv
501 -- Make the final type-env
502 -- Include the dfun_ids so that their type sigs get
503 -- are written into the interface file
504 ; let { type_env0 = tcg_type_env gbl_env
505 ; type_env1 = extendTypeEnvWithIds type_env0 val_ids
506 ; type_env2 = extendTypeEnvWithIds type_env1 dfun_ids
507 ; dfun_ids = map iDFunId inst_infos }
508 ; return (gbl_env { tcg_type_env = type_env2 })
511 spliceInHsBootErr (SpliceDecl (L loc _), _)
512 = addErrAt loc (ptext SLIT("Splices are not allowed in hs-boot files"))
515 Once we've typechecked the body of the module, we want to compare what
516 we've found (gathered in a TypeEnv) with the hi-boot details (if any).
519 checkHiBootIface :: TcGblEnv -> ModDetails -> TcM (LHsBinds Id)
520 -- Compare the hi-boot file for this module (if there is one)
521 -- with the type environment we've just come up with
522 -- In the common case where there is no hi-boot file, the list
523 -- of boot_names is empty.
525 -- The bindings we return give bindings for the dfuns defined in the
526 -- hs-boot file, such as $fbEqT = $fEqT
529 (TcGblEnv { tcg_insts = local_insts, tcg_type_env = local_type_env })
530 (ModDetails { md_insts = boot_insts, md_types = boot_type_env })
531 = do { mapM_ check_one (typeEnvElts boot_type_env)
532 ; dfun_binds <- mapM check_inst boot_insts
533 ; return (unionManyBags dfun_binds) }
539 = case lookupTypeEnv local_type_env name of
540 Nothing -> addErrTc (missingBootThing boot_thing)
541 Just real_thing -> check_thing boot_thing real_thing
543 name = getName boot_thing
545 no_check name = isWiredInName name -- No checking for wired-in names. In particular,
546 -- 'error' is handled by a rather gross hack
547 -- (see comments in GHC.Err.hs-boot)
548 || name `elem` dfun_names
549 dfun_names = map getName boot_insts
552 = case [dfun | inst <- local_insts,
553 let dfun = instanceDFunId inst,
554 idType dfun `tcEqType` boot_inst_ty ] of
555 [] -> do { addErrTc (instMisMatch boot_inst); return emptyBag }
556 (dfun:_) -> return (unitBag $ noLoc $ VarBind local_boot_dfun (nlHsVar dfun))
558 boot_dfun = instanceDFunId boot_inst
559 boot_inst_ty = idType boot_dfun
560 local_boot_dfun = mkExportedLocalId (idName boot_dfun) boot_inst_ty
563 check_thing (ATyCon boot_tc) (ATyCon real_tc)
564 | isSynTyCon boot_tc && isSynTyCon real_tc,
565 defn1 `tcEqType` substTyWith tvs2 (mkTyVarTys tvs1) defn2
568 | tyConKind boot_tc == tyConKind real_tc
571 (tvs1, defn1) = getSynTyConDefn boot_tc
572 (tvs2, defn2) = getSynTyConDefn boot_tc
574 check_thing (AnId boot_id) (AnId real_id)
575 | idType boot_id `tcEqType` idType real_id
578 check_thing (ADataCon dc1) (ADataCon dc2)
579 | idType (dataConWrapId dc1) `tcEqType` idType (dataConWrapId dc2)
582 -- Can't declare a class in a hi-boot file
584 check_thing boot_thing real_thing -- Default case; failure
585 = addErrAt (srcLocSpan (getSrcLoc real_thing))
586 (bootMisMatch real_thing)
589 missingBootThing thing
590 = ppr thing <+> ptext SLIT("is defined in the hs-boot file, but not in the module")
592 = ppr thing <+> ptext SLIT("has conflicting definitions in the module and its hs-boot file")
595 2 (ptext SLIT("is defined in the hs-boot file, but not in the module"))
599 %************************************************************************
601 Type-checking the top level of a module
603 %************************************************************************
605 tcRnGroup takes a bunch of top-level source-code declarations, and
607 * gets supporting declarations from interface files
610 * and augments the TcGblEnv with the results
612 In Template Haskell it may be called repeatedly for each group of
613 declarations. It expects there to be an incoming TcGblEnv in the
614 monad; it augments it and returns the new TcGblEnv.
617 tcRnGroup :: ModDetails -> HsGroup RdrName -> TcM (TcGblEnv, TcLclEnv)
618 -- Returns the variables free in the decls, for unused-binding reporting
619 tcRnGroup boot_details decls
620 = do { -- Rename the declarations
621 (tcg_env, rn_decls) <- rnTopSrcDecls decls ;
622 setGblEnv tcg_env $ do {
624 -- Typecheck the declarations
625 tcTopSrcDecls boot_details rn_decls
628 ------------------------------------------------
629 rnTopSrcDecls :: HsGroup RdrName -> TcM (TcGblEnv, HsGroup Name)
631 = do { -- Bring top level binders into scope
632 (rdr_env, imports) <- importsFromLocalDecls group ;
633 updGblEnv (\gbl -> gbl { tcg_rdr_env = rdr_env `plusGlobalRdrEnv` tcg_rdr_env gbl,
634 tcg_imports = imports `plusImportAvails` tcg_imports gbl })
637 traceRn (ptext SLIT("rnTopSrcDecls") <+> ppr rdr_env) ;
638 failIfErrsM ; -- No point in continuing if (say) we have duplicate declarations
640 -- Rename the source decls
641 (tcg_env, rn_decls) <- rnSrcDecls group ;
644 -- save the renamed syntax, if we want it
646 | Just grp <- tcg_rn_decls tcg_env
647 = tcg_env{ tcg_rn_decls = Just (appendGroups grp rn_decls) }
651 -- Dump trace of renaming part
652 rnDump (ppr rn_decls) ;
654 return (tcg_env', rn_decls)
657 ------------------------------------------------
658 tcTopSrcDecls :: ModDetails -> HsGroup Name -> TcM (TcGblEnv, TcLclEnv)
659 tcTopSrcDecls boot_details
660 (HsGroup { hs_tyclds = tycl_decls,
661 hs_instds = inst_decls,
662 hs_fords = foreign_decls,
663 hs_defds = default_decls,
664 hs_ruleds = rule_decls,
665 hs_valds = val_binds })
666 = do { -- Type-check the type and class decls, and all imported decls
667 -- The latter come in via tycl_decls
668 traceTc (text "Tc2") ;
670 tcg_env <- checkNoErrs (tcTyAndClassDecls boot_details tycl_decls) ;
671 -- tcTyAndClassDecls recovers internally, but if anything gave rise to
672 -- an error we'd better stop now, to avoid a cascade
674 -- Make these type and class decls available to stuff slurped from interface files
675 writeMutVar (tcg_type_env_var tcg_env) (tcg_type_env tcg_env) ;
678 setGblEnv tcg_env $ do {
679 -- Source-language instances, including derivings,
680 -- and import the supporting declarations
681 traceTc (text "Tc3") ;
682 (tcg_env, inst_infos, deriv_binds) <- tcInstDecls1 tycl_decls inst_decls ;
683 setGblEnv tcg_env $ do {
685 -- Foreign import declarations next. No zonking necessary
686 -- here; we can tuck them straight into the global environment.
687 traceTc (text "Tc4") ;
688 (fi_ids, fi_decls) <- tcForeignImports foreign_decls ;
689 tcExtendGlobalValEnv fi_ids $ do {
691 -- Default declarations
692 traceTc (text "Tc4a") ;
693 default_tys <- tcDefaults default_decls ;
694 updGblEnv (\gbl -> gbl { tcg_default = default_tys }) $ do {
696 -- Value declarations next
697 -- We also typecheck any extra binds that came out
698 -- of the "deriving" process (deriv_binds)
699 traceTc (text "Tc5") ;
700 (tc_val_binds, lcl_env) <- tcTopBinds (val_binds ++ deriv_binds) ;
701 setLclTypeEnv lcl_env $ do {
703 -- Second pass over class and instance declarations,
704 traceTc (text "Tc6") ;
705 (tcl_env, inst_binds) <- tcInstDecls2 tycl_decls inst_infos ;
706 showLIE (text "after instDecls2") ;
709 -- They need to be zonked, so we return them
710 traceTc (text "Tc7") ;
711 (foe_binds, foe_decls) <- tcForeignExports foreign_decls ;
714 rules <- tcRules rule_decls ;
717 traceTc (text "Tc7a") ;
718 tcg_env <- getGblEnv ;
719 let { all_binds = tc_val_binds `unionBags`
720 inst_binds `unionBags`
723 -- Extend the GblEnv with the (as yet un-zonked)
724 -- bindings, rules, foreign decls
725 tcg_env' = tcg_env { tcg_binds = tcg_binds tcg_env `unionBags` all_binds,
726 tcg_rules = tcg_rules tcg_env ++ rules,
727 tcg_fords = tcg_fords tcg_env ++ foe_decls ++ fi_decls } } ;
728 return (tcg_env', lcl_env)
733 %************************************************************************
737 %************************************************************************
741 = do { ghci_mode <- getGhciMode ;
742 tcg_env <- getGblEnv ;
744 let { main_mod = case mainModIs dflags of {
745 Just mod -> mkModule mod ;
747 main_fn = case mainFunIs dflags of {
748 Just fn -> mkRdrUnqual (mkVarOcc (mkFastString fn)) ;
749 Nothing -> main_RDR_Unqual } } ;
751 check_main ghci_mode tcg_env main_mod main_fn
755 check_main ghci_mode tcg_env main_mod main_fn
756 -- If we are in module Main, check that 'main' is defined.
757 -- It may be imported from another module!
760 -- Blimey: a whole page of code to do this...
765 = addErrCtxt mainCtxt $
766 do { mb_main <- lookupSrcOcc_maybe main_fn
767 -- Check that 'main' is in scope
768 -- It might be imported from another module!
770 Nothing -> do { complain_no_main
773 { let { rhs = nlHsApp (nlHsVar runMainIOName) (nlHsVar main_name) }
774 -- :Main.main :: IO () = runMainIO main
776 ; (main_expr, ty) <- setSrcSpan (srcLocSpan (getSrcLoc main_name)) $
779 ; let { root_main_id = mkExportedLocalId rootMainName ty ;
780 main_bind = noLoc (VarBind root_main_id main_expr) }
782 ; return (tcg_env { tcg_binds = tcg_binds tcg_env
784 tcg_dus = tcg_dus tcg_env
785 `plusDU` usesOnly (unitFV main_name)
786 -- Record the use of 'main', so that we don't
787 -- complain about it being defined but not used
791 mod = tcg_mod tcg_env
793 complain_no_main | ghci_mode == Interactive = return ()
794 | otherwise = failWithTc noMainMsg
795 -- In interactive mode, don't worry about the absence of 'main'
796 -- In other modes, fail altogether, so that we don't go on
797 -- and complain a second time when processing the export list.
799 mainCtxt = ptext SLIT("When checking the type of the main function") <+> quotes (ppr main_fn)
800 noMainMsg = ptext SLIT("The main function") <+> quotes (ppr main_fn)
801 <+> ptext SLIT("is not defined in module") <+> quotes (ppr main_mod)
804 %*********************************************************
808 %*********************************************************
812 setInteractiveContext :: HscEnv -> InteractiveContext -> TcRn a -> TcRn a
813 setInteractiveContext hsc_env icxt thing_inside
815 -- Initialise the tcg_inst_env with instances
816 -- from all home modules. This mimics the more selective
817 -- call to hptInstances in tcRnModule
818 dfuns = hptInstances hsc_env (\mod -> True)
820 updGblEnv (\env -> env {
821 tcg_rdr_env = ic_rn_gbl_env icxt,
822 tcg_type_env = ic_type_env icxt,
823 tcg_inst_env = extendInstEnvList (tcg_inst_env env) dfuns }) $
825 updLclEnv (\env -> env { tcl_rdr = ic_rn_local_env icxt }) $
827 do { traceTc (text "setIC" <+> ppr (ic_type_env icxt))
834 -> InteractiveContext
836 -> IO (Maybe (InteractiveContext, [Name], LHsExpr Id))
837 -- The returned [Name] is the same as the input except for
838 -- ExprStmt, in which case the returned [Name] is [itName]
840 -- The returned TypecheckedHsExpr is of type IO [ () ],
841 -- a list of the bound values, coerced to ().
843 tcRnStmt hsc_env ictxt rdr_stmt
844 = initTcPrintErrors hsc_env iNTERACTIVE $
845 setInteractiveContext hsc_env ictxt $ do {
847 -- Rename; use CmdLineMode because tcRnStmt is only used interactively
848 (([rn_stmt], _), fvs) <- rnStmts DoExpr [rdr_stmt] (return ((), emptyFVs)) ;
849 traceRn (text "tcRnStmt" <+> vcat [ppr rdr_stmt, ppr rn_stmt, ppr fvs]) ;
852 -- The real work is done here
853 (bound_ids, tc_expr) <- tcUserStmt rn_stmt ;
855 traceTc (text "tcs 1") ;
856 let { -- (a) Make all the bound ids "global" ids, now that
857 -- they're notionally top-level bindings. This is
858 -- important: otherwise when we come to compile an expression
859 -- using these ids later, the byte code generator will consider
860 -- the occurrences to be free rather than global.
862 -- (b) Tidy their types; this is important, because :info may
863 -- ask to look at them, and :info expects the things it looks
864 -- up to have tidy types
865 global_ids = map globaliseAndTidy bound_ids ;
867 -- Update the interactive context
868 rn_env = ic_rn_local_env ictxt ;
869 type_env = ic_type_env ictxt ;
871 bound_names = map idName global_ids ;
872 new_rn_env = extendLocalRdrEnv rn_env bound_names ;
874 -- Remove any shadowed bindings from the type_env;
875 -- they are inaccessible but might, I suppose, cause
876 -- a space leak if we leave them there
877 shadowed = [ n | name <- bound_names,
878 let rdr_name = mkRdrUnqual (nameOccName name),
879 Just n <- [lookupLocalRdrEnv rn_env rdr_name] ] ;
881 filtered_type_env = delListFromNameEnv type_env shadowed ;
882 new_type_env = extendTypeEnvWithIds filtered_type_env global_ids ;
884 new_ic = ictxt { ic_rn_local_env = new_rn_env,
885 ic_type_env = new_type_env }
888 dumpOptTcRn Opt_D_dump_tc
889 (vcat [text "Bound Ids" <+> pprWithCommas ppr global_ids,
890 text "Typechecked expr" <+> ppr tc_expr]) ;
892 returnM (new_ic, bound_names, tc_expr)
895 globaliseAndTidy :: Id -> Id
897 -- Give the Id a Global Name, and tidy its type
898 = setIdType (globaliseId VanillaGlobal id) tidy_type
900 tidy_type = tidyTopType (idType id)
903 Here is the grand plan, implemented in tcUserStmt
905 What you type The IO [HValue] that hscStmt returns
906 ------------- ------------------------------------
907 let pat = expr ==> let pat = expr in return [coerce HVal x, coerce HVal y, ...]
910 pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...]
913 expr (of IO type) ==> expr >>= \ it -> return [coerce HVal it]
914 [NB: result not printed] bindings: [it]
916 expr (of non-IO type, ==> let it = expr in print it >> return [coerce HVal it]
917 result showable) bindings: [it]
919 expr (of non-IO type,
920 result not showable) ==> error
924 ---------------------------
925 tcUserStmt :: LStmt Name -> TcM ([Id], LHsExpr Id)
926 tcUserStmt (L loc (ExprStmt expr _ _))
927 = newUnique `thenM` \ uniq ->
929 fresh_it = itName uniq
930 the_bind = noLoc $ FunBind (noLoc fresh_it) False
931 (mkMatchGroup [mkSimpleMatch [] expr])
933 tryTcLIE_ (do { -- Try this if the other fails
934 traceTc (text "tcs 1b") ;
935 tc_stmts (map (L loc) [
936 LetStmt [HsBindGroup (unitBag the_bind) [] NonRecursive],
937 ExprStmt (nlHsApp (nlHsVar printName) (nlHsVar fresh_it))
938 (HsVar thenIOName) placeHolderType
940 (do { -- Try this first
941 traceTc (text "tcs 1a") ;
942 tc_stmts [L loc (BindStmt (nlVarPat fresh_it) expr
943 (HsVar bindIOName) noSyntaxExpr) ] })
945 tcUserStmt stmt = tc_stmts [stmt]
947 ---------------------------
948 tc_stmts :: [LStmt Name] -> TcM ([Id], LHsExpr Id)
950 = do { ioTyCon <- tcLookupTyCon ioTyConName ;
952 ret_ty = mkListTy unitTy ;
953 io_ret_ty = mkTyConApp ioTyCon [ret_ty] ;
955 names = map unLoc (collectLStmtsBinders stmts) ;
957 -- mk_return builds the expression
958 -- returnIO @ [()] [coerce () x, .., coerce () z]
960 -- Despite the inconvenience of building the type applications etc,
961 -- this *has* to be done in type-annotated post-typecheck form
962 -- because we are going to return a list of *polymorphic* values
963 -- coerced to type (). If we built a *source* stmt
964 -- return [coerce x, ..., coerce z]
965 -- then the type checker would instantiate x..z, and we wouldn't
966 -- get their *polymorphic* values. (And we'd get ambiguity errs
967 -- if they were overloaded, since they aren't applied to anything.)
968 mk_return ret_id ids = nlHsApp (noLoc $ TyApp (nlHsVar ret_id) [ret_ty])
969 (noLoc $ ExplicitList unitTy (map mk_item ids)) ;
970 mk_item id = nlHsApp (noLoc $ TyApp (nlHsVar unsafeCoerceId) [idType id, unitTy])
973 io_ty = mkTyConApp ioTyCon []
976 -- OK, we're ready to typecheck the stmts
977 traceTc (text "tcs 2") ;
978 ((ids, tc_expr), lie) <- getLIE $ do {
979 (tc_stmts, ids) <- tcStmts DoExpr (tcDoStmt io_ty io_ret_ty) stmts $
981 -- Look up the names right in the middle,
982 -- where they will all be in scope
983 ids <- mappM tcLookupId names ;
986 ret_id <- tcLookupId returnIOName ; -- return @ IO
987 return (ids, noLoc (HsDo DoExpr tc_stmts (mk_return ret_id ids) io_ret_ty))
990 -- Simplify the context right here, so that we fail
991 -- if there aren't enough instances. Notably, when we see
993 -- we use recoverTc_ to try it <- e
994 -- and then let it = e
995 -- It's the simplify step that rejects the first.
996 traceTc (text "tcs 3") ;
997 const_binds <- tcSimplifyInteractive lie ;
999 -- Build result expression and zonk it
1000 let { expr = mkHsLet const_binds tc_expr } ;
1001 zonked_expr <- zonkTopLExpr expr ;
1002 zonked_ids <- zonkTopBndrs ids ;
1004 -- None of the Ids should be of unboxed type, because we
1005 -- cast them all to HValues in the end!
1006 mappM bad_unboxed (filter (isUnLiftedType . idType) zonked_ids) ;
1008 return (zonked_ids, zonked_expr)
1011 bad_unboxed id = addErr (sep [ptext SLIT("GHCi can't bind a variable of unlifted type:"),
1012 nest 2 (ppr id <+> dcolon <+> ppr (idType id))])
1016 tcRnExpr just finds the type of an expression
1020 -> InteractiveContext
1023 tcRnExpr hsc_env ictxt rdr_expr
1024 = initTcPrintErrors hsc_env iNTERACTIVE $
1025 setInteractiveContext hsc_env ictxt $ do {
1027 (rn_expr, fvs) <- rnLExpr rdr_expr ;
1030 -- Now typecheck the expression;
1031 -- it might have a rank-2 type (e.g. :t runST)
1032 ((tc_expr, res_ty), lie) <- getLIE (tcInferRho rn_expr) ;
1033 ((qtvs, _, dict_ids), lie_top) <- getLIE (tcSimplifyInfer smpl_doc (tyVarsOfType res_ty) lie) ;
1034 tcSimplifyInteractive lie_top ;
1035 qtvs' <- mappM zonkQuantifiedTyVar qtvs ;
1037 let { all_expr_ty = mkForAllTys qtvs' $
1038 mkFunTys (map idType dict_ids) $
1040 zonkTcType all_expr_ty
1043 smpl_doc = ptext SLIT("main expression")
1046 tcRnType just finds the kind of a type
1050 -> InteractiveContext
1053 tcRnType hsc_env ictxt rdr_type
1054 = initTcPrintErrors hsc_env iNTERACTIVE $
1055 setInteractiveContext hsc_env ictxt $ do {
1057 rn_type <- rnLHsType doc rdr_type ;
1060 -- Now kind-check the type
1061 (ty', kind) <- kcHsType rn_type ;
1065 doc = ptext SLIT("In GHCi input")
1071 %************************************************************************
1073 More GHCi stuff, to do with browsing and getting info
1075 %************************************************************************
1079 mkExportEnv :: HscEnv -> [Module] -- Expose these modules' exports only
1081 mkExportEnv hsc_env exports
1082 = do { mb_envs <- initTcPrintErrors hsc_env iNTERACTIVE $
1083 mappM getModuleExports exports
1085 Just envs -> return (foldr plusGlobalRdrEnv emptyGlobalRdrEnv envs)
1086 Nothing -> return emptyGlobalRdrEnv
1087 -- Some error; initTc will have printed it
1090 getModuleExports :: Module -> TcM GlobalRdrEnv
1091 getModuleExports mod
1092 = do { iface <- load_iface mod
1093 ; loadOrphanModules (dep_orphs (mi_deps iface))
1094 -- Load any orphan-module interfaces,
1095 -- so their instances are visible
1096 ; names <- ifaceExportNames (mi_exports iface)
1097 ; let { gres = [ GRE { gre_name = name, gre_prov = vanillaProv mod }
1098 | name <- nameSetToList names ] }
1099 ; returnM (mkGlobalRdrEnv gres) }
1101 vanillaProv :: Module -> Provenance
1102 -- We're building a GlobalRdrEnv as if the user imported
1103 -- all the specified modules into the global interactive module
1104 vanillaProv mod = Imported [ImportSpec mod mod False
1105 (srcLocSpan interactiveSrcLoc)] False
1111 -> Module -- Module to inspect
1112 -> Bool -- Grab just the exports, or the whole toplev
1113 -> IO (Maybe [IfaceDecl])
1115 getModuleContents hsc_env mod exports_only
1116 = initTcPrintErrors hsc_env iNTERACTIVE (get_mod_contents exports_only)
1118 get_mod_contents exports_only
1119 | not exports_only -- We want the whole top-level type env
1120 -- so it had better be a home module
1121 = do { hpt <- getHpt
1122 ; case lookupModuleEnv hpt mod of
1123 Just mod_info -> return (map (toIfaceDecl ext_nm) $
1126 md_types (hm_details mod_info))
1127 Nothing -> ghcError (ProgramError (showSDoc (noRdrEnvErr mod)))
1128 -- This is a system error; the module should be in the HPT
1131 | otherwise -- Want the exports only
1132 = do { iface <- load_iface mod
1133 ; mappM get_decl [ (mod,avail) | (mod, avails) <- mi_exports iface
1137 get_decl (mod, avail)
1138 = do { main_name <- lookupOrig mod (availName avail)
1139 ; thing <- tcLookupGlobal main_name
1140 ; return (filter_decl (availNames avail) (toIfaceDecl ext_nm thing)) }
1142 ext_nm = interactiveExtNameFun (icPrintUnqual (hsc_IC hsc_env))
1144 ---------------------
1145 filter_decl occs decl@(IfaceClass {ifSigs = sigs})
1146 = decl { ifSigs = filter (keep_sig occs) sigs }
1147 filter_decl occs decl@(IfaceData {ifCons = IfDataTyCon cons})
1148 = decl { ifCons = IfDataTyCon (filter (keep_con occs) cons) }
1149 filter_decl occs decl@(IfaceData {ifCons = IfNewTyCon con})
1150 | keep_con occs con = decl
1151 | otherwise = decl {ifCons = IfAbstractTyCon} -- Hmm?
1152 filter_decl occs decl
1155 keep_sig occs (IfaceClassOp occ _ _) = occ `elem` occs
1156 keep_con occs con = ifConOcc con `elem` occs
1158 wantToSee (AnId id) = not (isImplicitId id)
1159 wantToSee (ADataCon _) = False -- They'll come via their TyCon
1162 ---------------------
1163 load_iface mod = loadSrcInterface doc mod False {- Not boot iface -}
1165 doc = ptext SLIT("context for compiling statements")
1167 ---------------------
1168 noRdrEnvErr mod = ptext SLIT("No top-level environment available for module")
1169 <+> quotes (ppr mod)
1173 type GetInfoResult = (String, IfaceDecl, Fixity, SrcLoc,
1174 [(IfaceType,SrcLoc)] -- Instances
1177 tcRnLookupRdrName :: HscEnv -> RdrName -> IO (Maybe [Name])
1179 tcRnLookupRdrName hsc_env rdr_name
1180 = initTcPrintErrors hsc_env iNTERACTIVE $
1181 setInteractiveContext hsc_env (hsc_IC hsc_env) $
1182 lookup_rdr_name rdr_name
1185 lookup_rdr_name rdr_name = do {
1186 -- If the identifier is a constructor (begins with an
1187 -- upper-case letter), then we need to consider both
1188 -- constructor and type class identifiers.
1189 let { rdr_names = dataTcOccs rdr_name } ;
1191 -- results :: [(Messages, Maybe Name)]
1192 results <- mapM (tryTc . lookupOccRn) rdr_names ;
1194 traceRn (text "xx" <+> vcat [ppr rdr_names, ppr (map snd results)]);
1195 -- The successful lookups will be (Just name)
1196 let { (warns_s, good_names) = unzip [ (msgs, name)
1197 | (msgs, Just name) <- results] ;
1198 errs_s = [msgs | (msgs, Nothing) <- results] } ;
1200 -- Fail if nothing good happened, else add warnings
1201 if null good_names then
1202 -- No lookup succeeded, so
1203 -- pick the first error message and report it
1204 -- ToDo: If one of the errors is "could be Foo.X or Baz.X",
1205 -- while the other is "X is not in scope",
1206 -- we definitely want the former; but we might pick the latter
1207 do { addMessages (head errs_s) ; failM }
1208 else -- Add deprecation warnings
1209 mapM_ addMessages warns_s ;
1215 tcRnGetInfo :: HscEnv
1216 -> InteractiveContext
1218 -> IO (Maybe [GetInfoResult])
1220 -- Used to implemnent :info in GHCi
1222 -- Look up a RdrName and return all the TyThings it might be
1223 -- A capitalised RdrName is given to us in the DataName namespace,
1224 -- but we want to treat it as *both* a data constructor
1225 -- *and* as a type or class constructor;
1226 -- hence the call to dataTcOccs, and we return up to two results
1227 tcRnGetInfo hsc_env ictxt rdr_name
1228 = initTcPrintErrors hsc_env iNTERACTIVE $
1229 setInteractiveContext hsc_env ictxt $ do {
1231 -- Load the interface for all unqualified types and classes
1232 -- That way we will find all the instance declarations
1233 -- (Packages have not orphan modules, and we assume that
1234 -- in the home package all relevant modules are loaded.)
1235 loadUnqualIfaces ictxt ;
1237 good_names <- lookup_rdr_name rdr_name ;
1239 -- And lookup up the entities, avoiding duplicates, which arise
1240 -- because constructors and record selectors are represented by
1241 -- their parent declaration
1242 let { do_one name = do { thing <- tcLookupGlobal name
1243 ; fixity <- lookupFixityRn name
1244 ; ispecs <- lookupInsts print_unqual thing
1245 ; return (str, toIfaceDecl ext_nm thing, fixity,
1247 [(toIfaceType ext_nm (idType dfun), getSrcLoc dfun)
1248 | dfun <- map instanceDFunId ispecs ]
1251 -- str is the the naked occurrence name
1252 -- after stripping off qualification and parens (+)
1253 str = occNameUserString (nameOccName name)
1256 -- For the SrcLoc, the 'thing' has better info than
1257 -- the 'name' because getting the former forced the
1258 -- declaration to be loaded into the cache
1260 results <- mapM do_one good_names ;
1261 return (fst (removeDups cmp results))
1264 cmp (_,d1,_,_,_) (_,d2,_,_,_) = ifName d1 `compare` ifName d2
1265 ext_nm = interactiveExtNameFun print_unqual
1266 print_unqual = icPrintUnqual ictxt
1268 lookupInsts :: PrintUnqualified -> TyThing -> TcM [Instance]
1269 -- Filter the instances by the ones whose tycons (or clases resp)
1270 -- are in scope unqualified. Otherwise we list a whole lot too many!
1271 lookupInsts print_unqual (AClass cls)
1272 = do { inst_envs <- tcGetInstEnvs
1274 | ispec <- classInstances inst_envs cls
1275 , plausibleDFun print_unqual (instanceDFunId ispec) ] }
1277 lookupInsts print_unqual (ATyCon tc)
1278 = do { eps <- getEps -- Load all instances for all classes that are
1279 -- in the type environment (which are all the ones
1280 -- we've seen in any interface file so far)
1281 ; (pkg_ie, home_ie) <- tcGetInstEnvs -- Search all
1283 | ispec <- instEnvElts home_ie ++ instEnvElts pkg_ie
1284 , let dfun = instanceDFunId ispec
1286 , plausibleDFun print_unqual dfun ] }
1288 relevant df = tc_name `elemNameSet` tyClsNamesOfDFunHead (idType df)
1289 tc_name = tyConName tc
1291 lookupInsts print_unqual other = return []
1293 plausibleDFun print_unqual dfun -- Dfun involving only names that print unqualified
1294 = all ok (nameSetToList (tyClsNamesOfType (idType dfun)))
1296 ok name | isExternalName name = print_unqual (nameModule name) (nameOccName name)
1299 toIfaceDecl :: (Name -> IfaceExtName) -> TyThing -> IfaceDecl
1300 toIfaceDecl ext_nm thing
1301 = tyThingToIfaceDecl ext_nm (munge thing)
1303 -- munge transforms a thing to its "parent" thing
1304 munge (ADataCon dc) = ATyCon (dataConTyCon dc)
1305 munge (AnId id) = case globalIdDetails id of
1306 RecordSelId tc lbl -> ATyCon tc
1307 ClassOpId cls -> AClass cls
1309 munge other_thing = other_thing
1311 loadUnqualIfaces :: InteractiveContext -> TcM ()
1312 -- Load the home module for everything that is in scope unqualified
1313 -- This is so that we can accurately report the instances for
1315 loadUnqualIfaces ictxt
1317 mapM_ (loadSysInterface doc) (moduleSetElts (mkModuleSet unqual_mods))
1319 unqual_mods = [ nameModule name
1320 | gre <- globalRdrEnvElts (ic_rn_gbl_env ictxt),
1321 let name = gre_name gre,
1322 isTcOcc (nameOccName name), -- Types and classes only
1323 unQualOK gre ] -- In scope unqualified
1324 doc = ptext SLIT("Need interface for module whose export(s) are in scope unqualified")
1328 %************************************************************************
1332 %************************************************************************
1335 rnDump :: SDoc -> TcRn ()
1336 -- Dump, with a banner, if -ddump-rn
1337 rnDump doc = do { dumpOptTcRn Opt_D_dump_rn (mkDumpDoc "Renamer" doc) }
1339 tcDump :: TcGblEnv -> TcRn ()
1341 = do { dflags <- getDOpts ;
1343 -- Dump short output if -ddump-types or -ddump-tc
1344 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1345 (dumpTcRn short_dump) ;
1347 -- Dump bindings if -ddump-tc
1348 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump)
1351 short_dump = pprTcGblEnv env
1352 full_dump = pprLHsBinds (tcg_binds env)
1353 -- NB: foreign x-d's have undefined's in their types;
1354 -- hence can't show the tc_fords
1357 = do { dflags <- getDOpts ;
1358 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1359 (dumpTcRn (pprModGuts mod_guts)) ;
1361 -- Dump bindings if -ddump-tc
1362 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump) }
1364 full_dump = pprCoreBindings (mg_binds mod_guts)
1366 -- It's unpleasant having both pprModGuts and pprModDetails here
1367 pprTcGblEnv :: TcGblEnv -> SDoc
1368 pprTcGblEnv (TcGblEnv { tcg_type_env = type_env,
1369 tcg_insts = dfun_ids,
1371 tcg_imports = imports })
1372 = vcat [ ppr_types dfun_ids type_env
1373 , ppr_insts dfun_ids
1374 , vcat (map ppr rules)
1375 , ppr_gen_tycons (typeEnvTyCons type_env)
1376 , ptext SLIT("Dependent modules:") <+> ppr (moduleEnvElts (imp_dep_mods imports))
1377 , ptext SLIT("Dependent packages:") <+> ppr (imp_dep_pkgs imports)]
1379 pprModGuts :: ModGuts -> SDoc
1380 pprModGuts (ModGuts { mg_types = type_env,
1382 = vcat [ ppr_types [] type_env,
1386 ppr_types :: [Instance] -> TypeEnv -> SDoc
1387 ppr_types ispecs type_env
1388 = text "TYPE SIGNATURES" $$ nest 4 (ppr_sigs ids)
1390 dfun_ids = map instanceDFunId ispecs
1391 ids = [id | id <- typeEnvIds type_env, want_sig id]
1392 want_sig id | opt_PprStyle_Debug = True
1393 | otherwise = isLocalId id &&
1394 isExternalName (idName id) &&
1395 not (id `elem` dfun_ids)
1396 -- isLocalId ignores data constructors, records selectors etc.
1397 -- The isExternalName ignores local dictionary and method bindings
1398 -- that the type checker has invented. Top-level user-defined things
1399 -- have External names.
1401 ppr_insts :: [Instance] -> SDoc
1402 ppr_insts [] = empty
1403 ppr_insts ispecs = text "INSTANCES" $$ nest 2 (pprInstances ispecs)
1405 ppr_sigs :: [Var] -> SDoc
1407 -- Print type signatures; sort by OccName
1408 = vcat (map ppr_sig (sortLe le_sig ids))
1410 le_sig id1 id2 = getOccName id1 <= getOccName id2
1411 ppr_sig id = ppr id <+> dcolon <+> ppr (tidyTopType (idType id))
1413 ppr_rules :: [CoreRule] -> SDoc
1414 ppr_rules [] = empty
1415 ppr_rules rs = vcat [ptext SLIT("{-# RULES"),
1416 nest 4 (pprRules rs),
1419 ppr_gen_tycons [] = empty
1420 ppr_gen_tycons tcs = vcat [ptext SLIT("Tycons with generics:"),
1421 nest 2 (fsep (map ppr (filter tyConHasGenerics tcs)))]