2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[TcModule]{Typechecking a whole module}
9 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 ( GlobalRdrElt(..), globalRdrEnvElts,
90 unQualOK, lookupLocalRdrEnv, extendLocalRdrEnv )
91 import RnSource ( addTcgDUs )
92 import TcHsSyn ( mkHsLet, zonkTopLExpr, zonkTopBndrs )
93 import TcHsType ( kcHsType )
94 import TcMType ( zonkTcType, zonkQuantifiedTyVar )
95 import TcMatches ( tcStmts, tcDoStmt )
96 import TcSimplify ( tcSimplifyInteractive, tcSimplifyInfer )
97 import TcType ( Type, mkForAllTys, mkFunTys, mkTyConApp, tyVarsOfType,
98 isUnLiftedType, tyClsNamesOfDFunHead, tyClsNamesOfType )
99 import TcEnv ( tcLookupTyCon, tcLookupId, tcLookupGlobal )
100 import RnTypes ( rnLHsType )
101 import Inst ( tcGetInstEnvs )
102 import InstEnv ( classInstances, instEnvElts )
103 import RnExpr ( rnStmts, rnLExpr )
104 import LoadIface ( loadSrcInterface, loadSysInterface )
105 import IfaceSyn ( IfaceDecl(..), IfaceClassOp(..), IfaceConDecl(..),
106 IfaceExtName(..), IfaceConDecls(..),
108 import IfaceType ( IfaceType, toIfaceType,
109 interactiveExtNameFun )
110 import IfaceEnv ( lookupOrig, ifaceExportNames )
111 import Module ( lookupModuleEnv, moduleSetElts, mkModuleSet )
112 import RnEnv ( lookupOccRn, dataTcOccs, lookupFixityRn )
113 import Id ( isImplicitId, setIdType, globalIdDetails )
114 import MkId ( unsafeCoerceId )
115 import DataCon ( dataConTyCon )
116 import TyCon ( tyConName )
117 import TysWiredIn ( mkListTy, unitTy )
118 import IdInfo ( GlobalIdDetails(..) )
119 import SrcLoc ( unLoc )
121 import Var ( globaliseId )
122 import Name ( nameOccName, nameModule, isBuiltInSyntax, nameParent_maybe )
123 import OccName ( occNameUserString, isTcOcc )
124 import NameEnv ( delListFromNameEnv )
125 import PrelNames ( iNTERACTIVE, ioTyConName, printName, itName,
126 bindIOName, thenIOName, returnIOName )
127 import HscTypes ( InteractiveContext(..), HomeModInfo(..),
128 availNames, availName, ModIface(..), icPrintUnqual,
130 import BasicTypes ( RecFlag(..), Fixity )
131 import Panic ( ghcError, GhcException(..) )
132 import SrcLoc ( SrcLoc )
135 import FastString ( mkFastString )
136 import Util ( sortLe )
137 import Bag ( unionBags, snocBag, emptyBag, unitBag, unionManyBags )
139 import Maybe ( isJust )
144 %************************************************************************
146 Typecheck and rename a module
148 %************************************************************************
154 -> Bool -- True <=> save renamed syntax
155 -> Located (HsModule RdrName)
156 -> IO (Messages, Maybe TcGblEnv)
158 tcRnModule hsc_env hsc_src save_rn_decls
159 (L loc (HsModule maybe_mod export_ies
160 import_decls local_decls mod_deprec))
161 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
163 let { this_mod = case maybe_mod of
164 Nothing -> mAIN -- 'module M where' is omitted
165 Just (L _ mod) -> mod } ; -- The normal case
167 initTc hsc_env hsc_src this_mod $
170 checkForPackageModule (hsc_dflags hsc_env) this_mod;
172 -- Deal with imports; sets tcg_rdr_env, tcg_imports
173 (rdr_env, imports) <- rnImports import_decls ;
175 let { dep_mods :: ModuleEnv (Module, IsBootInterface)
176 ; dep_mods = imp_dep_mods imports
178 -- We want instance declarations from all home-package
179 -- modules below this one, including boot modules, except
180 -- ourselves. The 'except ourselves' is so that we don't
181 -- get the instances from this module's hs-boot file
182 ; want_instances :: Module -> Bool
183 ; want_instances mod = mod `elemModuleEnv` dep_mods
185 ; home_insts = hptInstances hsc_env want_instances
188 -- Record boot-file info in the EPS, so that it's
189 -- visible to loadHiBootInterface in tcRnSrcDecls,
190 -- and any other incrementally-performed imports
191 updateEps_ (\eps -> eps { eps_is_boot = dep_mods }) ;
193 -- Update the gbl env
195 gbl { tcg_rdr_env = rdr_env,
196 tcg_inst_env = extendInstEnvList (tcg_inst_env gbl) home_insts,
197 tcg_imports = tcg_imports gbl `plusImportAvails` imports,
198 tcg_rn_decls = if save_rn_decls then
204 traceRn (text "rn1" <+> ppr (imp_dep_mods imports)) ;
205 -- Fail if there are any errors so far
206 -- The error printing (if needed) takes advantage
207 -- of the tcg_env we have now set
210 -- Load any orphan-module interfaces, so that
211 -- their rules and instance decls will be found
212 loadOrphanModules (imp_orphs imports) ;
214 traceRn (text "rn1a") ;
215 -- Rename and type check the declarations
216 tcg_env <- if isHsBoot hsc_src then
217 tcRnHsBootDecls local_decls
219 tcRnSrcDecls local_decls ;
220 setGblEnv tcg_env $ do {
222 traceRn (text "rn3") ;
224 -- Report the use of any deprecated things
225 -- We do this before processsing the export list so
226 -- that we don't bleat about re-exporting a deprecated
227 -- thing (especially via 'module Foo' export item)
228 -- Only uses in the body of the module are complained about
229 reportDeprecations tcg_env ;
231 -- Process the export list
232 exports <- exportsFromAvail (isJust maybe_mod) export_ies ;
234 -- Check whether the entire module is deprecated
235 -- This happens only once per module
236 let { mod_deprecs = checkModDeprec mod_deprec } ;
238 -- Add exports and deprecations to envt
239 let { final_env = tcg_env { tcg_exports = exports,
240 tcg_dus = tcg_dus tcg_env `plusDU` usesOnly exports,
241 tcg_deprecs = tcg_deprecs tcg_env `plusDeprecs`
243 -- A module deprecation over-rides the earlier ones
246 -- Report unused names
247 reportUnusedNames export_ies final_env ;
249 -- Dump output and return
254 -- This is really a sanity check that the user has given -package-name
255 -- if necessary. -package-name is only necessary when the package database
256 -- already contains the current package, because then we can't tell
257 -- whether a given module is in the current package or not, without knowing
258 -- the name of the current package.
259 checkForPackageModule dflags this_mod
260 | not (isHomeModule dflags this_mod),
261 Just (pkg,_) <- moduleToPackageConfig dflags this_mod =
263 ppr_pkg = ppr (mkPackageId (package pkg))
265 addErr (ptext SLIT("Module") <+> quotes (ppr this_mod) <+>
266 ptext SLIT("is a member of package") <+> ppr_pkg <> char '.' $$
267 ptext SLIT("To compile this module, please use -ignore-package") <+> ppr_pkg <> char '.')
268 | otherwise = return ()
272 %************************************************************************
274 Type-checking external-core modules
276 %************************************************************************
279 tcRnExtCore :: HscEnv
281 -> IO (Messages, Maybe ModGuts)
282 -- Nothing => some error occurred
284 tcRnExtCore hsc_env (HsExtCore this_mod decls src_binds)
285 -- The decls are IfaceDecls; all names are original names
286 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
288 initTc hsc_env ExtCoreFile this_mod $ do {
290 let { ldecls = map noLoc decls } ;
292 -- Deal with the type declarations; first bring their stuff
293 -- into scope, then rname them, then type check them
294 tcg_env <- importsFromLocalDecls (mkFakeGroup ldecls) ;
296 setGblEnv tcg_env $ do {
298 rn_decls <- rnTyClDecls ldecls ;
301 -- Dump trace of renaming part
302 rnDump (ppr rn_decls) ;
304 -- Typecheck them all together so that
305 -- any mutually recursive types are done right
306 tcg_env <- checkNoErrs (tcTyAndClassDecls emptyModDetails rn_decls) ;
307 -- Make the new type env available to stuff slurped from interface files
309 setGblEnv tcg_env $ do {
311 -- Now the core bindings
312 core_binds <- initIfaceExtCore (tcExtCoreBindings src_binds) ;
316 bndrs = bindersOfBinds core_binds ;
317 my_exports = mkNameSet (map idName bndrs) ;
318 -- ToDo: export the data types also?
320 final_type_env = extendTypeEnvWithIds (tcg_type_env tcg_env) bndrs ;
322 mod_guts = ModGuts { mg_module = this_mod,
324 mg_usages = [], -- ToDo: compute usage
325 mg_dir_imps = [], -- ??
326 mg_deps = noDependencies, -- ??
327 mg_exports = my_exports,
328 mg_types = final_type_env,
329 mg_insts = tcg_insts tcg_env,
331 mg_binds = core_binds,
334 mg_rdr_env = emptyGlobalRdrEnv,
335 mg_fix_env = emptyFixityEnv,
336 mg_deprecs = NoDeprecs,
340 tcCoreDump mod_guts ;
345 mkFakeGroup decls -- Rather clumsy; lots of unused fields
346 = HsGroup { hs_tyclds = decls, -- This is the one we want
347 hs_valds = [], hs_fords = [],
348 hs_instds = [], hs_fixds = [], hs_depds = [],
349 hs_ruleds = [], hs_defds = [] }
353 %************************************************************************
355 Type-checking the top level of a module
357 %************************************************************************
360 tcRnSrcDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
361 -- Returns the variables free in the decls
362 -- Reason: solely to report unused imports and bindings
364 = do { -- Load the hi-boot interface for this module, if any
365 -- We do this now so that the boot_names can be passed
366 -- to tcTyAndClassDecls, because the boot_names are
367 -- automatically considered to be loop breakers
369 boot_iface <- tcHiBootIface mod ;
371 -- Do all the declarations
372 (tc_envs, lie) <- getLIE (tc_rn_src_decls boot_iface decls) ;
374 -- tcSimplifyTop deals with constant or ambiguous InstIds.
375 -- How could there be ambiguous ones? They can only arise if a
376 -- top-level decl falls under the monomorphism
377 -- restriction, and no subsequent decl instantiates its
378 -- type. (Usually, ambiguous type variables are resolved
379 -- during the generalisation step.)
380 traceTc (text "Tc8") ;
381 inst_binds <- setEnvs tc_envs (tcSimplifyTop lie) ;
382 -- Setting the global env exposes the instances to tcSimplifyTop
383 -- Setting the local env exposes the local Ids to tcSimplifyTop,
384 -- so that we get better error messages (monomorphism restriction)
386 -- Backsubstitution. This must be done last.
387 -- Even tcSimplifyTop may do some unification.
388 traceTc (text "Tc9") ;
389 let { (tcg_env, _) = tc_envs ;
390 TcGblEnv { tcg_type_env = type_env, tcg_binds = binds,
391 tcg_rules = rules, tcg_fords = fords } = tcg_env } ;
393 (bind_ids, binds', fords', rules') <- zonkTopDecls (binds `unionBags` inst_binds)
396 let { final_type_env = extendTypeEnvWithIds type_env bind_ids
397 ; tcg_env' = tcg_env { tcg_type_env = final_type_env,
400 tcg_fords = fords' } } ;
402 -- Make the new type env available to stuff slurped from interface files
403 writeMutVar (tcg_type_env_var tcg_env) final_type_env ;
405 -- Compare the hi-boot iface (if any) with the real thing
406 dfun_binds <- checkHiBootIface tcg_env' boot_iface ;
408 return (tcg_env' { tcg_binds = tcg_binds tcg_env' `unionBags` dfun_binds })
411 tc_rn_src_decls :: ModDetails -> [LHsDecl RdrName] -> TcM (TcGblEnv, TcLclEnv)
412 -- Loops around dealing with each top level inter-splice group
413 -- in turn, until it's dealt with the entire module
414 tc_rn_src_decls boot_details ds
415 = do { let { (first_group, group_tail) = findSplice ds } ;
416 -- If ds is [] we get ([], Nothing)
418 -- Type check the decls up to, but not including, the first splice
419 tc_envs@(tcg_env,tcl_env) <- tcRnGroup boot_details first_group ;
421 -- Bale out if errors; for example, error recovery when checking
422 -- the RHS of 'main' can mean that 'main' is not in the envt for
423 -- the subsequent checkMain test
428 -- If there is no splice, we're nearly done
430 Nothing -> do { -- Last thing: check for `main'
431 tcg_env <- checkMain ;
432 return (tcg_env, tcl_env)
435 -- If there's a splice, we must carry on
436 Just (SpliceDecl splice_expr, rest_ds) -> do {
438 failWithTc (text "Can't do a top-level splice; need a bootstrapped compiler")
441 -- Rename the splice expression, and get its supporting decls
442 (rn_splice_expr, splice_fvs) <- rnLExpr splice_expr ;
443 failIfErrsM ; -- Don't typecheck if renaming failed
445 -- Execute the splice
446 spliced_decls <- tcSpliceDecls rn_splice_expr ;
448 -- Glue them on the front of the remaining decls and loop
449 setGblEnv (tcg_env `addTcgDUs` usesOnly splice_fvs) $
450 tc_rn_src_decls boot_details (spliced_decls ++ rest_ds)
455 %************************************************************************
457 Compiling hs-boot source files, and
458 comparing the hi-boot interface with the real thing
460 %************************************************************************
463 tcRnHsBootDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
464 tcRnHsBootDecls decls
465 = do { let { (first_group, group_tail) = findSplice decls }
468 Just stuff -> spliceInHsBootErr stuff
471 -- Rename the declarations
472 ; (tcg_env, rn_group) <- rnTopSrcDecls first_group
473 ; setGblEnv tcg_env $ do {
475 -- Todo: check no foreign decls, no rules, no default decls
477 -- Typecheck type/class decls
478 ; traceTc (text "Tc2")
479 ; let tycl_decls = hs_tyclds rn_group
480 ; tcg_env <- checkNoErrs (tcTyAndClassDecls emptyModDetails tycl_decls)
481 ; setGblEnv tcg_env $ do {
483 -- Typecheck instance decls
484 ; traceTc (text "Tc3")
485 ; (tcg_env, inst_infos, _binds) <- tcInstDecls1 tycl_decls (hs_instds rn_group)
486 ; setGblEnv tcg_env $ do {
488 -- Typecheck value declarations
489 ; traceTc (text "Tc5")
490 ; val_ids <- tcHsBootSigs (hs_valds rn_group)
493 -- No simplification or zonking to do
494 ; traceTc (text "Tc7a")
495 ; gbl_env <- getGblEnv
497 -- Make the final type-env
498 -- Include the dfun_ids so that their type sigs get
499 -- are written into the interface file
500 ; let { type_env0 = tcg_type_env gbl_env
501 ; type_env1 = extendTypeEnvWithIds type_env0 val_ids
502 ; type_env2 = extendTypeEnvWithIds type_env1 dfun_ids
503 ; dfun_ids = map iDFunId inst_infos }
504 ; return (gbl_env { tcg_type_env = type_env2 })
507 spliceInHsBootErr (SpliceDecl (L loc _), _)
508 = addErrAt loc (ptext SLIT("Splices are not allowed in hs-boot files"))
511 Once we've typechecked the body of the module, we want to compare what
512 we've found (gathered in a TypeEnv) with the hi-boot details (if any).
515 checkHiBootIface :: TcGblEnv -> ModDetails -> TcM (LHsBinds Id)
516 -- Compare the hi-boot file for this module (if there is one)
517 -- with the type environment we've just come up with
518 -- In the common case where there is no hi-boot file, the list
519 -- of boot_names is empty.
521 -- The bindings we return give bindings for the dfuns defined in the
522 -- hs-boot file, such as $fbEqT = $fEqT
525 (TcGblEnv { tcg_insts = local_insts, tcg_type_env = local_type_env })
526 (ModDetails { md_insts = boot_insts, md_types = boot_type_env })
527 = do { mapM_ check_one (typeEnvElts boot_type_env)
528 ; dfun_binds <- mapM check_inst boot_insts
529 ; return (unionManyBags dfun_binds) }
535 = case lookupTypeEnv local_type_env name of
536 Nothing -> addErrTc (missingBootThing boot_thing)
537 Just real_thing -> check_thing boot_thing real_thing
539 name = getName boot_thing
541 no_check name = isWiredInName name -- No checking for wired-in names. In particular,
542 -- 'error' is handled by a rather gross hack
543 -- (see comments in GHC.Err.hs-boot)
544 || name `elem` dfun_names
545 dfun_names = map getName boot_insts
548 = case [dfun | inst <- local_insts,
549 let dfun = instanceDFunId inst,
550 idType dfun `tcEqType` boot_inst_ty ] of
551 [] -> do { addErrTc (instMisMatch boot_inst); return emptyBag }
552 (dfun:_) -> return (unitBag $ noLoc $ VarBind local_boot_dfun (nlHsVar dfun))
554 boot_dfun = instanceDFunId boot_inst
555 boot_inst_ty = idType boot_dfun
556 local_boot_dfun = mkExportedLocalId (idName boot_dfun) boot_inst_ty
559 check_thing (ATyCon boot_tc) (ATyCon real_tc)
560 | isSynTyCon boot_tc && isSynTyCon real_tc,
561 defn1 `tcEqType` substTyWith tvs2 (mkTyVarTys tvs1) defn2
564 | tyConKind boot_tc == tyConKind real_tc
567 (tvs1, defn1) = getSynTyConDefn boot_tc
568 (tvs2, defn2) = getSynTyConDefn boot_tc
570 check_thing (AnId boot_id) (AnId real_id)
571 | idType boot_id `tcEqType` idType real_id
574 check_thing (ADataCon dc1) (ADataCon dc2)
575 | idType (dataConWrapId dc1) `tcEqType` idType (dataConWrapId dc2)
578 -- Can't declare a class in a hi-boot file
580 check_thing boot_thing real_thing -- Default case; failure
581 = addErrAt (srcLocSpan (getSrcLoc real_thing))
582 (bootMisMatch real_thing)
585 missingBootThing thing
586 = ppr thing <+> ptext SLIT("is defined in the hs-boot file, but not in the module")
588 = ppr thing <+> ptext SLIT("has conflicting definitions in the module and its hs-boot file")
591 2 (ptext SLIT("is defined in the hs-boot file, but not in the module"))
595 %************************************************************************
597 Type-checking the top level of a module
599 %************************************************************************
601 tcRnGroup takes a bunch of top-level source-code declarations, and
603 * gets supporting declarations from interface files
606 * and augments the TcGblEnv with the results
608 In Template Haskell it may be called repeatedly for each group of
609 declarations. It expects there to be an incoming TcGblEnv in the
610 monad; it augments it and returns the new TcGblEnv.
613 tcRnGroup :: ModDetails -> HsGroup RdrName -> TcM (TcGblEnv, TcLclEnv)
614 -- Returns the variables free in the decls, for unused-binding reporting
615 tcRnGroup boot_details decls
616 = do { -- Rename the declarations
617 (tcg_env, rn_decls) <- rnTopSrcDecls decls ;
618 setGblEnv tcg_env $ do {
620 -- Typecheck the declarations
621 tcTopSrcDecls boot_details rn_decls
624 ------------------------------------------------
625 rnTopSrcDecls :: HsGroup RdrName -> TcM (TcGblEnv, HsGroup Name)
627 = do { -- Bring top level binders into scope
628 tcg_env <- importsFromLocalDecls group ;
629 setGblEnv tcg_env $ do {
631 failIfErrsM ; -- No point in continuing if (say) we have duplicate declarations
633 -- Rename the source decls
634 (tcg_env, rn_decls) <- rnSrcDecls group ;
637 -- save the renamed syntax, if we want it
639 | Just grp <- tcg_rn_decls tcg_env
640 = tcg_env{ tcg_rn_decls = Just (appendGroups grp rn_decls) }
644 -- Dump trace of renaming part
645 rnDump (ppr rn_decls) ;
647 return (tcg_env', rn_decls)
650 ------------------------------------------------
651 tcTopSrcDecls :: ModDetails -> HsGroup Name -> TcM (TcGblEnv, TcLclEnv)
652 tcTopSrcDecls boot_details
653 (HsGroup { hs_tyclds = tycl_decls,
654 hs_instds = inst_decls,
655 hs_fords = foreign_decls,
656 hs_defds = default_decls,
657 hs_ruleds = rule_decls,
658 hs_valds = val_binds })
659 = do { -- Type-check the type and class decls, and all imported decls
660 -- The latter come in via tycl_decls
661 traceTc (text "Tc2") ;
663 tcg_env <- checkNoErrs (tcTyAndClassDecls boot_details tycl_decls) ;
664 -- tcTyAndClassDecls recovers internally, but if anything gave rise to
665 -- an error we'd better stop now, to avoid a cascade
667 -- Make these type and class decls available to stuff slurped from interface files
668 writeMutVar (tcg_type_env_var tcg_env) (tcg_type_env tcg_env) ;
671 setGblEnv tcg_env $ do {
672 -- Source-language instances, including derivings,
673 -- and import the supporting declarations
674 traceTc (text "Tc3") ;
675 (tcg_env, inst_infos, deriv_binds) <- tcInstDecls1 tycl_decls inst_decls ;
676 setGblEnv tcg_env $ do {
678 -- Foreign import declarations next. No zonking necessary
679 -- here; we can tuck them straight into the global environment.
680 traceTc (text "Tc4") ;
681 (fi_ids, fi_decls) <- tcForeignImports foreign_decls ;
682 tcExtendGlobalValEnv fi_ids $ do {
684 -- Default declarations
685 traceTc (text "Tc4a") ;
686 default_tys <- tcDefaults default_decls ;
687 updGblEnv (\gbl -> gbl { tcg_default = default_tys }) $ do {
689 -- Value declarations next
690 -- We also typecheck any extra binds that came out
691 -- of the "deriving" process (deriv_binds)
692 traceTc (text "Tc5") ;
693 (tc_val_binds, lcl_env) <- tcTopBinds (val_binds ++ deriv_binds) ;
694 setLclTypeEnv lcl_env $ do {
696 -- Second pass over class and instance declarations,
697 traceTc (text "Tc6") ;
698 (tcl_env, inst_binds) <- tcInstDecls2 tycl_decls inst_infos ;
699 showLIE (text "after instDecls2") ;
702 -- They need to be zonked, so we return them
703 traceTc (text "Tc7") ;
704 (foe_binds, foe_decls) <- tcForeignExports foreign_decls ;
707 rules <- tcRules rule_decls ;
710 traceTc (text "Tc7a") ;
711 tcg_env <- getGblEnv ;
712 let { all_binds = tc_val_binds `unionBags`
713 inst_binds `unionBags`
716 -- Extend the GblEnv with the (as yet un-zonked)
717 -- bindings, rules, foreign decls
718 tcg_env' = tcg_env { tcg_binds = tcg_binds tcg_env `unionBags` all_binds,
719 tcg_rules = tcg_rules tcg_env ++ rules,
720 tcg_fords = tcg_fords tcg_env ++ foe_decls ++ fi_decls } } ;
721 return (tcg_env', lcl_env)
726 %************************************************************************
730 %************************************************************************
734 = do { ghci_mode <- getGhciMode ;
735 tcg_env <- getGblEnv ;
737 let { main_mod = case mainModIs dflags of {
738 Just mod -> mkModule mod ;
740 main_fn = case mainFunIs dflags of {
741 Just fn -> mkRdrUnqual (mkVarOcc (mkFastString fn)) ;
742 Nothing -> main_RDR_Unqual } } ;
744 check_main ghci_mode tcg_env main_mod main_fn
748 check_main ghci_mode tcg_env main_mod main_fn
749 -- If we are in module Main, check that 'main' is defined.
750 -- It may be imported from another module!
753 -- Blimey: a whole page of code to do this...
758 = addErrCtxt mainCtxt $
759 do { mb_main <- lookupSrcOcc_maybe main_fn
760 -- Check that 'main' is in scope
761 -- It might be imported from another module!
763 Nothing -> do { complain_no_main
766 { let { rhs = nlHsApp (nlHsVar runMainIOName) (nlHsVar main_name) }
767 -- :Main.main :: IO () = runMainIO main
769 ; (main_expr, ty) <- setSrcSpan (srcLocSpan (getSrcLoc main_name)) $
772 ; let { root_main_id = mkExportedLocalId rootMainName ty ;
773 main_bind = noLoc (VarBind root_main_id main_expr) }
775 ; return (tcg_env { tcg_binds = tcg_binds tcg_env
777 tcg_dus = tcg_dus tcg_env
778 `plusDU` usesOnly (unitFV main_name)
779 -- Record the use of 'main', so that we don't
780 -- complain about it being defined but not used
784 mod = tcg_mod tcg_env
786 complain_no_main | ghci_mode == Interactive = return ()
787 | otherwise = failWithTc noMainMsg
788 -- In interactive mode, don't worry about the absence of 'main'
789 -- In other modes, fail altogether, so that we don't go on
790 -- and complain a second time when processing the export list.
792 mainCtxt = ptext SLIT("When checking the type of the main function") <+> quotes (ppr main_fn)
793 noMainMsg = ptext SLIT("The main function") <+> quotes (ppr main_fn)
794 <+> ptext SLIT("is not defined in module") <+> quotes (ppr main_mod)
797 %*********************************************************
801 %*********************************************************
805 setInteractiveContext :: HscEnv -> InteractiveContext -> TcRn a -> TcRn a
806 setInteractiveContext hsc_env icxt thing_inside
808 -- Initialise the tcg_inst_env with instances
809 -- from all home modules. This mimics the more selective
810 -- call to hptInstances in tcRnModule
811 dfuns = hptInstances hsc_env (\mod -> True)
813 updGblEnv (\env -> env {
814 tcg_rdr_env = ic_rn_gbl_env icxt,
815 tcg_type_env = ic_type_env icxt,
816 tcg_inst_env = extendInstEnvList (tcg_inst_env env) dfuns }) $
818 updLclEnv (\env -> env { tcl_rdr = ic_rn_local_env icxt }) $
820 do { traceTc (text "setIC" <+> ppr (ic_type_env icxt))
827 -> InteractiveContext
829 -> IO (Maybe (InteractiveContext, [Name], LHsExpr Id))
830 -- The returned [Name] is the same as the input except for
831 -- ExprStmt, in which case the returned [Name] is [itName]
833 -- The returned TypecheckedHsExpr is of type IO [ () ],
834 -- a list of the bound values, coerced to ().
836 tcRnStmt hsc_env ictxt rdr_stmt
837 = initTcPrintErrors hsc_env iNTERACTIVE $
838 setInteractiveContext hsc_env ictxt $ do {
840 -- Rename; use CmdLineMode because tcRnStmt is only used interactively
841 (([rn_stmt], _), fvs) <- rnStmts DoExpr [rdr_stmt] (return ((), emptyFVs)) ;
842 traceRn (text "tcRnStmt" <+> vcat [ppr rdr_stmt, ppr rn_stmt, ppr fvs]) ;
845 -- The real work is done here
846 (bound_ids, tc_expr) <- tcUserStmt rn_stmt ;
848 traceTc (text "tcs 1") ;
849 let { -- (a) Make all the bound ids "global" ids, now that
850 -- they're notionally top-level bindings. This is
851 -- important: otherwise when we come to compile an expression
852 -- using these ids later, the byte code generator will consider
853 -- the occurrences to be free rather than global.
855 -- (b) Tidy their types; this is important, because :info may
856 -- ask to look at them, and :info expects the things it looks
857 -- up to have tidy types
858 global_ids = map globaliseAndTidy bound_ids ;
860 -- Update the interactive context
861 rn_env = ic_rn_local_env ictxt ;
862 type_env = ic_type_env ictxt ;
864 bound_names = map idName global_ids ;
865 new_rn_env = extendLocalRdrEnv rn_env bound_names ;
867 -- Remove any shadowed bindings from the type_env;
868 -- they are inaccessible but might, I suppose, cause
869 -- a space leak if we leave them there
870 shadowed = [ n | name <- bound_names,
871 let rdr_name = mkRdrUnqual (nameOccName name),
872 Just n <- [lookupLocalRdrEnv rn_env rdr_name] ] ;
874 filtered_type_env = delListFromNameEnv type_env shadowed ;
875 new_type_env = extendTypeEnvWithIds filtered_type_env global_ids ;
877 new_ic = ictxt { ic_rn_local_env = new_rn_env,
878 ic_type_env = new_type_env }
881 dumpOptTcRn Opt_D_dump_tc
882 (vcat [text "Bound Ids" <+> pprWithCommas ppr global_ids,
883 text "Typechecked expr" <+> ppr tc_expr]) ;
885 returnM (new_ic, bound_names, tc_expr)
888 globaliseAndTidy :: Id -> Id
890 -- Give the Id a Global Name, and tidy its type
891 = setIdType (globaliseId VanillaGlobal id) tidy_type
893 tidy_type = tidyTopType (idType id)
896 Here is the grand plan, implemented in tcUserStmt
898 What you type The IO [HValue] that hscStmt returns
899 ------------- ------------------------------------
900 let pat = expr ==> let pat = expr in return [coerce HVal x, coerce HVal y, ...]
903 pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...]
906 expr (of IO type) ==> expr >>= \ it -> return [coerce HVal it]
907 [NB: result not printed] bindings: [it]
909 expr (of non-IO type, ==> let it = expr in print it >> return [coerce HVal it]
910 result showable) bindings: [it]
912 expr (of non-IO type,
913 result not showable) ==> error
917 ---------------------------
918 tcUserStmt :: LStmt Name -> TcM ([Id], LHsExpr Id)
919 tcUserStmt (L loc (ExprStmt expr _ _))
920 = newUnique `thenM` \ uniq ->
922 fresh_it = itName uniq
923 the_bind = noLoc $ FunBind (noLoc fresh_it) False
924 (mkMatchGroup [mkSimpleMatch [] expr])
926 tryTcLIE_ (do { -- Try this if the other fails
927 traceTc (text "tcs 1b") ;
928 tc_stmts (map (L loc) [
929 LetStmt [HsBindGroup (unitBag the_bind) [] NonRecursive],
930 ExprStmt (nlHsApp (nlHsVar printName) (nlHsVar fresh_it))
931 (HsVar thenIOName) placeHolderType
933 (do { -- Try this first
934 traceTc (text "tcs 1a") ;
935 tc_stmts [L loc (BindStmt (nlVarPat fresh_it) expr
936 (HsVar bindIOName) noSyntaxExpr) ] })
938 tcUserStmt stmt = tc_stmts [stmt]
940 ---------------------------
941 tc_stmts :: [LStmt Name] -> TcM ([Id], LHsExpr Id)
943 = do { ioTyCon <- tcLookupTyCon ioTyConName ;
945 ret_ty = mkListTy unitTy ;
946 io_ret_ty = mkTyConApp ioTyCon [ret_ty] ;
948 names = map unLoc (collectLStmtsBinders stmts) ;
950 -- mk_return builds the expression
951 -- returnIO @ [()] [coerce () x, .., coerce () z]
953 -- Despite the inconvenience of building the type applications etc,
954 -- this *has* to be done in type-annotated post-typecheck form
955 -- because we are going to return a list of *polymorphic* values
956 -- coerced to type (). If we built a *source* stmt
957 -- return [coerce x, ..., coerce z]
958 -- then the type checker would instantiate x..z, and we wouldn't
959 -- get their *polymorphic* values. (And we'd get ambiguity errs
960 -- if they were overloaded, since they aren't applied to anything.)
961 mk_return ret_id ids = nlHsApp (noLoc $ TyApp (nlHsVar ret_id) [ret_ty])
962 (noLoc $ ExplicitList unitTy (map mk_item ids)) ;
963 mk_item id = nlHsApp (noLoc $ TyApp (nlHsVar unsafeCoerceId) [idType id, unitTy])
966 io_ty = mkTyConApp ioTyCon []
969 -- OK, we're ready to typecheck the stmts
970 traceTc (text "tcs 2") ;
971 ((ids, tc_expr), lie) <- getLIE $ do {
972 (tc_stmts, ids) <- tcStmts DoExpr (tcDoStmt io_ty io_ret_ty) stmts $
974 -- Look up the names right in the middle,
975 -- where they will all be in scope
976 ids <- mappM tcLookupId names ;
979 ret_id <- tcLookupId returnIOName ; -- return @ IO
980 return (ids, noLoc (HsDo DoExpr tc_stmts (mk_return ret_id ids) io_ret_ty))
983 -- Simplify the context right here, so that we fail
984 -- if there aren't enough instances. Notably, when we see
986 -- we use recoverTc_ to try it <- e
987 -- and then let it = e
988 -- It's the simplify step that rejects the first.
989 traceTc (text "tcs 3") ;
990 const_binds <- tcSimplifyInteractive lie ;
992 -- Build result expression and zonk it
993 let { expr = mkHsLet const_binds tc_expr } ;
994 zonked_expr <- zonkTopLExpr expr ;
995 zonked_ids <- zonkTopBndrs ids ;
997 -- None of the Ids should be of unboxed type, because we
998 -- cast them all to HValues in the end!
999 mappM bad_unboxed (filter (isUnLiftedType . idType) zonked_ids) ;
1001 return (zonked_ids, zonked_expr)
1004 bad_unboxed id = addErr (sep [ptext SLIT("GHCi can't bind a variable of unlifted type:"),
1005 nest 2 (ppr id <+> dcolon <+> ppr (idType id))])
1009 tcRnExpr just finds the type of an expression
1013 -> InteractiveContext
1016 tcRnExpr hsc_env ictxt rdr_expr
1017 = initTcPrintErrors hsc_env iNTERACTIVE $
1018 setInteractiveContext hsc_env ictxt $ do {
1020 (rn_expr, fvs) <- rnLExpr rdr_expr ;
1023 -- Now typecheck the expression;
1024 -- it might have a rank-2 type (e.g. :t runST)
1025 ((tc_expr, res_ty), lie) <- getLIE (tcInferRho rn_expr) ;
1026 ((qtvs, _, dict_ids), lie_top) <- getLIE (tcSimplifyInfer smpl_doc (tyVarsOfType res_ty) lie) ;
1027 tcSimplifyInteractive lie_top ;
1028 qtvs' <- mappM zonkQuantifiedTyVar qtvs ;
1030 let { all_expr_ty = mkForAllTys qtvs' $
1031 mkFunTys (map idType dict_ids) $
1033 zonkTcType all_expr_ty
1036 smpl_doc = ptext SLIT("main expression")
1039 tcRnType just finds the kind of a type
1043 -> InteractiveContext
1046 tcRnType hsc_env ictxt rdr_type
1047 = initTcPrintErrors hsc_env iNTERACTIVE $
1048 setInteractiveContext hsc_env ictxt $ do {
1050 rn_type <- rnLHsType doc rdr_type ;
1053 -- Now kind-check the type
1054 (ty', kind) <- kcHsType rn_type ;
1058 doc = ptext SLIT("In GHCi input")
1064 %************************************************************************
1066 More GHCi stuff, to do with browsing and getting info
1068 %************************************************************************
1072 getModuleExports :: HscEnv -> Module -> IO (Maybe NameSet)
1073 getModuleExports hsc_env mod
1074 = initTcPrintErrors hsc_env iNTERACTIVE (tcGetModuleExports mod)
1076 tcGetModuleExports :: Module -> TcM NameSet
1077 tcGetModuleExports mod = do
1078 iface <- load_iface mod
1079 loadOrphanModules (dep_orphs (mi_deps iface))
1080 -- Load any orphan-module interfaces,
1081 -- so their instances are visible
1082 ifaceExportNames (mi_exports iface)
1088 -> Module -- Module to inspect
1089 -> Bool -- Grab just the exports, or the whole toplev
1090 -> IO (Maybe [IfaceDecl])
1092 getModuleContents hsc_env mod exports_only
1093 = initTcPrintErrors hsc_env iNTERACTIVE (get_mod_contents exports_only)
1095 get_mod_contents exports_only
1096 | not exports_only -- We want the whole top-level type env
1097 -- so it had better be a home module
1098 = do { hpt <- getHpt
1099 ; case lookupModuleEnv hpt mod of
1100 Just mod_info -> return (map (toIfaceDecl ext_nm) $
1103 md_types (hm_details mod_info))
1104 Nothing -> ghcError (ProgramError (showSDoc (noRdrEnvErr mod)))
1105 -- This is a system error; the module should be in the HPT
1108 | otherwise -- Want the exports only
1109 = do { iface <- load_iface mod
1110 ; mappM get_decl [ (mod,avail) | (mod, avails) <- mi_exports iface
1114 get_decl (mod, avail)
1115 = do { main_name <- lookupOrig mod (availName avail)
1116 ; thing <- tcLookupGlobal main_name
1117 ; return (filter_decl (availNames avail) (toIfaceDecl ext_nm thing)) }
1119 ext_nm = interactiveExtNameFun (icPrintUnqual (hsc_IC hsc_env))
1121 ---------------------
1122 filter_decl occs decl@(IfaceClass {ifSigs = sigs})
1123 = decl { ifSigs = filter (keep_sig occs) sigs }
1124 filter_decl occs decl@(IfaceData {ifCons = IfDataTyCon cons})
1125 = decl { ifCons = IfDataTyCon (filter (keep_con occs) cons) }
1126 filter_decl occs decl@(IfaceData {ifCons = IfNewTyCon con})
1127 | keep_con occs con = decl
1128 | otherwise = decl {ifCons = IfAbstractTyCon} -- Hmm?
1129 filter_decl occs decl
1132 keep_sig occs (IfaceClassOp occ _ _) = occ `elem` occs
1133 keep_con occs con = ifConOcc con `elem` occs
1135 wantToSee (AnId id) = not (isImplicitId id)
1136 wantToSee (ADataCon _) = False -- They'll come via their TyCon
1139 ---------------------
1140 load_iface mod = loadSrcInterface doc mod False {- Not boot iface -}
1142 doc = ptext SLIT("context for compiling statements")
1144 ---------------------
1145 noRdrEnvErr mod = ptext SLIT("No top-level environment available for module")
1146 <+> quotes (ppr mod)
1150 type GetInfoResult = (String, IfaceDecl, Fixity, SrcLoc,
1151 [(IfaceType,SrcLoc)] -- Instances
1154 tcRnLookupRdrName :: HscEnv -> RdrName -> IO (Maybe [Name])
1156 tcRnLookupRdrName hsc_env rdr_name
1157 = initTcPrintErrors hsc_env iNTERACTIVE $
1158 setInteractiveContext hsc_env (hsc_IC hsc_env) $
1159 lookup_rdr_name rdr_name
1162 lookup_rdr_name rdr_name = do {
1163 -- If the identifier is a constructor (begins with an
1164 -- upper-case letter), then we need to consider both
1165 -- constructor and type class identifiers.
1166 let { rdr_names = dataTcOccs rdr_name } ;
1168 -- results :: [(Messages, Maybe Name)]
1169 results <- mapM (tryTc . lookupOccRn) rdr_names ;
1171 traceRn (text "xx" <+> vcat [ppr rdr_names, ppr (map snd results)]);
1172 -- The successful lookups will be (Just name)
1173 let { (warns_s, good_names) = unzip [ (msgs, name)
1174 | (msgs, Just name) <- results] ;
1175 errs_s = [msgs | (msgs, Nothing) <- results] } ;
1177 -- Fail if nothing good happened, else add warnings
1178 if null good_names then
1179 -- No lookup succeeded, so
1180 -- pick the first error message and report it
1181 -- ToDo: If one of the errors is "could be Foo.X or Baz.X",
1182 -- while the other is "X is not in scope",
1183 -- we definitely want the former; but we might pick the latter
1184 do { addMessages (head errs_s) ; failM }
1185 else -- Add deprecation warnings
1186 mapM_ addMessages warns_s ;
1192 tcRnGetInfo :: HscEnv
1193 -> InteractiveContext
1195 -> IO (Maybe [GetInfoResult])
1197 -- Used to implemnent :info in GHCi
1199 -- Look up a RdrName and return all the TyThings it might be
1200 -- A capitalised RdrName is given to us in the DataName namespace,
1201 -- but we want to treat it as *both* a data constructor
1202 -- *and* as a type or class constructor;
1203 -- hence the call to dataTcOccs, and we return up to two results
1204 tcRnGetInfo hsc_env ictxt rdr_name
1205 = initTcPrintErrors hsc_env iNTERACTIVE $
1206 setInteractiveContext hsc_env ictxt $ do {
1208 -- Load the interface for all unqualified types and classes
1209 -- That way we will find all the instance declarations
1210 -- (Packages have not orphan modules, and we assume that
1211 -- in the home package all relevant modules are loaded.)
1212 loadUnqualIfaces ictxt ;
1214 good_names <- lookup_rdr_name rdr_name ;
1216 -- And lookup up the entities, avoiding duplicates, which arise
1217 -- because constructors and record selectors are represented by
1218 -- their parent declaration
1219 let { do_one name = do { thing <- tcLookupGlobal name
1220 ; fixity <- lookupFixityRn name
1221 ; ispecs <- lookupInsts print_unqual thing
1222 ; return (str, toIfaceDecl ext_nm thing, fixity,
1224 [(toIfaceType ext_nm (idType dfun), getSrcLoc dfun)
1225 | dfun <- map instanceDFunId ispecs ]
1228 -- str is the the naked occurrence name
1229 -- after stripping off qualification and parens (+)
1230 str = occNameUserString (nameOccName name)
1233 | Just p <- nameParent_maybe n = p `elem` good_names
1237 -- For the SrcLoc, the 'thing' has better info than
1238 -- the 'name' because getting the former forced the
1239 -- declaration to be loaded into the cache
1241 mapM do_one (filter (not . parent_is_there) good_names)
1242 -- Filter out names whose parent is also there
1243 -- Good example is '[]', which is both a type and data constructor
1247 ext_nm = interactiveExtNameFun print_unqual
1248 print_unqual = icPrintUnqual ictxt
1250 lookupInsts :: PrintUnqualified -> TyThing -> TcM [Instance]
1251 -- Filter the instances by the ones whose tycons (or clases resp)
1252 -- are in scope unqualified. Otherwise we list a whole lot too many!
1253 lookupInsts print_unqual (AClass cls)
1254 = do { inst_envs <- tcGetInstEnvs
1256 | ispec <- classInstances inst_envs cls
1257 , plausibleDFun print_unqual (instanceDFunId ispec) ] }
1259 lookupInsts print_unqual (ATyCon tc)
1260 = do { eps <- getEps -- Load all instances for all classes that are
1261 -- in the type environment (which are all the ones
1262 -- we've seen in any interface file so far)
1263 ; (pkg_ie, home_ie) <- tcGetInstEnvs -- Search all
1265 | ispec <- instEnvElts home_ie ++ instEnvElts pkg_ie
1266 , let dfun = instanceDFunId ispec
1268 , plausibleDFun print_unqual dfun ] }
1270 relevant df = tc_name `elemNameSet` tyClsNamesOfDFunHead (idType df)
1271 tc_name = tyConName tc
1273 lookupInsts print_unqual other = return []
1275 plausibleDFun print_unqual dfun -- Dfun involving only names that print unqualified
1276 = all ok (nameSetToList (tyClsNamesOfType (idType dfun)))
1278 ok name | isBuiltInSyntax name = True
1279 | isExternalName name = print_unqual (nameModule name) (nameOccName name)
1282 toIfaceDecl :: (Name -> IfaceExtName) -> TyThing -> IfaceDecl
1283 toIfaceDecl ext_nm thing
1284 = tyThingToIfaceDecl ext_nm (munge thing)
1286 -- munge transforms a thing to its "parent" thing
1287 munge (ADataCon dc) = ATyCon (dataConTyCon dc)
1288 munge (AnId id) = case globalIdDetails id of
1289 RecordSelId tc lbl -> ATyCon tc
1290 ClassOpId cls -> AClass cls
1292 munge other_thing = other_thing
1294 loadUnqualIfaces :: InteractiveContext -> TcM ()
1295 -- Load the home module for everything that is in scope unqualified
1296 -- This is so that we can accurately report the instances for
1298 loadUnqualIfaces ictxt
1300 mapM_ (loadSysInterface doc) (moduleSetElts (mkModuleSet unqual_mods))
1302 unqual_mods = [ nameModule name
1303 | gre <- globalRdrEnvElts (ic_rn_gbl_env ictxt),
1304 let name = gre_name gre,
1305 isTcOcc (nameOccName name), -- Types and classes only
1306 unQualOK gre ] -- In scope unqualified
1307 doc = ptext SLIT("Need interface for module whose export(s) are in scope unqualified")
1311 %************************************************************************
1315 %************************************************************************
1318 rnDump :: SDoc -> TcRn ()
1319 -- Dump, with a banner, if -ddump-rn
1320 rnDump doc = do { dumpOptTcRn Opt_D_dump_rn (mkDumpDoc "Renamer" doc) }
1322 tcDump :: TcGblEnv -> TcRn ()
1324 = do { dflags <- getDOpts ;
1326 -- Dump short output if -ddump-types or -ddump-tc
1327 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1328 (dumpTcRn short_dump) ;
1330 -- Dump bindings if -ddump-tc
1331 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump)
1334 short_dump = pprTcGblEnv env
1335 full_dump = pprLHsBinds (tcg_binds env)
1336 -- NB: foreign x-d's have undefined's in their types;
1337 -- hence can't show the tc_fords
1340 = do { dflags <- getDOpts ;
1341 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1342 (dumpTcRn (pprModGuts mod_guts)) ;
1344 -- Dump bindings if -ddump-tc
1345 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump) }
1347 full_dump = pprCoreBindings (mg_binds mod_guts)
1349 -- It's unpleasant having both pprModGuts and pprModDetails here
1350 pprTcGblEnv :: TcGblEnv -> SDoc
1351 pprTcGblEnv (TcGblEnv { tcg_type_env = type_env,
1352 tcg_insts = dfun_ids,
1354 tcg_imports = imports })
1355 = vcat [ ppr_types dfun_ids type_env
1356 , ppr_insts dfun_ids
1357 , vcat (map ppr rules)
1358 , ppr_gen_tycons (typeEnvTyCons type_env)
1359 , ptext SLIT("Dependent modules:") <+> ppr (moduleEnvElts (imp_dep_mods imports))
1360 , ptext SLIT("Dependent packages:") <+> ppr (imp_dep_pkgs imports)]
1362 pprModGuts :: ModGuts -> SDoc
1363 pprModGuts (ModGuts { mg_types = type_env,
1365 = vcat [ ppr_types [] type_env,
1369 ppr_types :: [Instance] -> TypeEnv -> SDoc
1370 ppr_types ispecs type_env
1371 = text "TYPE SIGNATURES" $$ nest 4 (ppr_sigs ids)
1373 dfun_ids = map instanceDFunId ispecs
1374 ids = [id | id <- typeEnvIds type_env, want_sig id]
1375 want_sig id | opt_PprStyle_Debug = True
1376 | otherwise = isLocalId id &&
1377 isExternalName (idName id) &&
1378 not (id `elem` dfun_ids)
1379 -- isLocalId ignores data constructors, records selectors etc.
1380 -- The isExternalName ignores local dictionary and method bindings
1381 -- that the type checker has invented. Top-level user-defined things
1382 -- have External names.
1384 ppr_insts :: [Instance] -> SDoc
1385 ppr_insts [] = empty
1386 ppr_insts ispecs = text "INSTANCES" $$ nest 2 (pprInstances ispecs)
1388 ppr_sigs :: [Var] -> SDoc
1390 -- Print type signatures; sort by OccName
1391 = vcat (map ppr_sig (sortLe le_sig ids))
1393 le_sig id1 id2 = getOccName id1 <= getOccName id2
1394 ppr_sig id = ppr id <+> dcolon <+> ppr (tidyTopType (idType id))
1396 ppr_rules :: [CoreRule] -> SDoc
1397 ppr_rules [] = empty
1398 ppr_rules rs = vcat [ptext SLIT("{-# RULES"),
1399 nest 4 (pprRules rs),
1402 ppr_gen_tycons [] = empty
1403 ppr_gen_tycons tcs = vcat [ptext SLIT("Tycons with generics:"),
1404 nest 2 (fsep (map ppr (filter tyConHasGenerics tcs)))]