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(..),
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 )
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 ( pprIdRules, pprCoreBindings )
61 import CoreSyn ( IdCoreRule, bindersOfBinds )
62 import DataCon ( dataConWrapId )
63 import ErrUtils ( Messages, mkDumpDoc, showPass )
64 import Id ( mkExportedLocalId, isLocalId, idName, idType )
66 import Module ( Module, ModuleEnv, mkModule, moduleEnvElts, lookupModuleEnv )
67 import OccName ( mkVarOcc )
68 import Name ( Name, NamedThing(..), isExternalName, getSrcLoc,
69 getOccName, isWiredInName )
71 import TyCon ( tyConHasGenerics, isSynTyCon, getSynTyConDefn, tyConKind )
72 import SrcLoc ( srcLocSpan, Located(..), noLoc )
73 import DriverPhases ( HscSource(..), isHsBoot )
74 import HscTypes ( ModGuts(..), ModDetails(..), emptyModDetails,
75 HscEnv(..), ExternalPackageState(..),
76 IsBootInterface, noDependencies,
77 Deprecs( NoDeprecs ), plusDeprecs,
78 ForeignStubs(NoStubs), TyThing(..),
79 TypeEnv, lookupTypeEnv, hptInstances,
80 extendTypeEnvWithIds, typeEnvIds, typeEnvTyCons, typeEnvElts,
86 import HsSyn ( HsStmtContext(..), Stmt(..), HsExpr(..), HsBindGroup(..),
87 LStmt, LHsExpr, LHsType, mkMatchGroup,
88 collectLStmtsBinders, mkSimpleMatch, nlVarPat,
89 placeHolderType, noSyntaxExpr )
90 import RdrName ( GlobalRdrEnv, mkGlobalRdrEnv, GlobalRdrElt(..),
91 Provenance(..), ImportSpec(..),
92 lookupLocalRdrEnv, extendLocalRdrEnv )
93 import RnSource ( addTcgDUs )
94 import TcHsSyn ( mkHsLet, zonkTopLExpr, zonkTopBndrs )
95 import TcHsType ( kcHsType )
96 import TcIface ( loadImportedInsts )
97 import TcMType ( zonkTcType, zonkQuantifiedTyVar )
98 import TcMatches ( tcStmts, tcDoStmt )
99 import TcSimplify ( tcSimplifyInteractive, tcSimplifyInfer )
100 import TcType ( Type, mkForAllTys, mkFunTys, mkTyConApp, tyVarsOfType,
101 isUnLiftedType, tyClsNamesOfDFunHead )
102 import TcEnv ( tcLookupTyCon, tcLookupId, tcLookupGlobal )
103 import RnTypes ( rnLHsType )
104 import Inst ( tcGetInstEnvs )
105 import InstEnv ( DFunId, classInstances, instEnvElts )
106 import RnExpr ( rnStmts, rnLExpr )
107 import LoadIface ( loadSrcInterface, ifaceInstGates )
108 import IfaceSyn ( IfaceDecl(..), IfaceClassOp(..), IfaceConDecl(..),
109 IfaceExtName(..), IfaceConDecls(..), IfaceInst(..),
110 tyThingToIfaceDecl, dfunToIfaceInst )
111 import IfaceType ( IfaceTyCon(..), IfaceType, toIfaceType,
112 interactiveExtNameFun, isLocalIfaceExtName )
113 import IfaceEnv ( lookupOrig, ifaceExportNames )
114 import RnEnv ( lookupOccRn, dataTcOccs, lookupFixityRn )
115 import Id ( 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 )
125 import OccName ( occNameUserString )
126 import NameEnv ( delListFromNameEnv )
127 import PrelNames ( iNTERACTIVE, ioTyConName, printName, itName,
128 bindIOName, thenIOName, returnIOName )
129 import HscTypes ( InteractiveContext(..), HomeModInfo(..), typeEnvElts, typeEnvClasses,
130 availNames, availName, ModIface(..), icPrintUnqual,
131 ModDetails(..), Dependencies(..) )
132 import BasicTypes ( RecFlag(..), Fixity )
133 import Bag ( unitBag )
134 import ListSetOps ( removeDups )
135 import Panic ( ghcError, GhcException(..) )
136 import SrcLoc ( SrcLoc )
139 import FastString ( mkFastString )
140 import Util ( sortLe )
141 import Bag ( unionBags, snocBag )
143 import Maybe ( isJust )
148 %************************************************************************
150 Typecheck and rename a module
152 %************************************************************************
158 -> Bool -- True <=> save renamed syntax
159 -> Located (HsModule RdrName)
160 -> IO (Messages, Maybe TcGblEnv)
162 tcRnModule hsc_env hsc_src save_rn_decls
163 (L loc (HsModule maybe_mod export_ies
164 import_decls local_decls mod_deprec))
165 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
167 let { this_mod = case maybe_mod of
168 Nothing -> mAIN -- 'module M where' is omitted
169 Just (L _ mod) -> mod } ; -- The normal case
171 initTc hsc_env hsc_src this_mod $
174 checkForPackageModule (hsc_dflags hsc_env) this_mod;
176 -- Deal with imports; sets tcg_rdr_env, tcg_imports
177 (rdr_env, imports) <- rnImports import_decls ;
179 let { dep_mods :: ModuleEnv (Module, IsBootInterface)
180 ; dep_mods = imp_dep_mods imports
182 ; is_dep_mod :: Module -> Bool
183 ; is_dep_mod mod = case lookupModuleEnv dep_mods mod of
185 Just (_, is_boot) -> not is_boot
186 ; home_insts = hptInstances hsc_env is_dep_mod
189 -- Record boot-file info in the EPS, so that it's
190 -- visible to loadHiBootInterface in tcRnSrcDecls,
191 -- and any other incrementally-performed imports
192 updateEps_ (\eps -> eps { eps_is_boot = dep_mods }) ;
194 -- Update the gbl env
196 gbl { tcg_rdr_env = rdr_env,
197 tcg_inst_env = extendInstEnvList (tcg_inst_env gbl) home_insts,
198 tcg_imports = tcg_imports gbl `plusImportAvails` imports,
199 tcg_rn_decls = if save_rn_decls then
205 traceRn (text "rn1" <+> ppr (imp_dep_mods imports)) ;
206 -- Fail if there are any errors so far
207 -- The error printing (if needed) takes advantage
208 -- of the tcg_env we have now set
211 -- Load any orphan-module interfaces, so that
212 -- their rules and instance decls will be found
213 loadOrphanModules (imp_orphs imports) ;
215 traceRn (text "rn1a") ;
216 -- Rename and type check the declarations
217 tcg_env <- if isHsBoot hsc_src then
218 tcRnHsBootDecls local_decls
220 tcRnSrcDecls local_decls ;
221 setGblEnv tcg_env $ do {
223 traceRn (text "rn3") ;
225 -- Report the use of any deprecated things
226 -- We do this before processsing the export list so
227 -- that we don't bleat about re-exporting a deprecated
228 -- thing (especially via 'module Foo' export item)
229 -- Only uses in the body of the module are complained about
230 reportDeprecations tcg_env ;
232 -- Process the export list
233 exports <- exportsFromAvail (isJust maybe_mod) export_ies ;
235 -- Check whether the entire module is deprecated
236 -- This happens only once per module
237 let { mod_deprecs = checkModDeprec mod_deprec } ;
239 -- Add exports and deprecations to envt
240 let { final_env = tcg_env { tcg_exports = exports,
241 tcg_dus = tcg_dus tcg_env `plusDU` usesOnly exports,
242 tcg_deprecs = tcg_deprecs tcg_env `plusDeprecs`
244 -- A module deprecation over-rides the earlier ones
247 -- Report unused names
248 reportUnusedNames export_ies final_env ;
250 -- Dump output and return
255 -- This is really a sanity check that the user has given -package-name
256 -- if necessary. -package-name is only necessary when the package database
257 -- already contains the current package, because then we can't tell
258 -- whether a given module is in the current package or not, without knowing
259 -- the name of the current package.
260 checkForPackageModule dflags this_mod
261 | not (isHomeModule dflags this_mod),
262 Just (pkg,_) <- moduleToPackageConfig dflags this_mod =
264 ppr_pkg = ppr (mkPackageId (package pkg))
266 addErr (ptext SLIT("Module") <+> quotes (ppr this_mod) <+>
267 ptext SLIT("is a member of package") <+> ppr_pkg <> char '.' $$
268 ptext SLIT("To compile this module, please use -ignore-package") <+> ppr_pkg <> char '.')
269 | otherwise = return ()
273 %************************************************************************
275 Type-checking external-core modules
277 %************************************************************************
280 tcRnExtCore :: HscEnv
282 -> IO (Messages, Maybe ModGuts)
283 -- Nothing => some error occurred
285 tcRnExtCore hsc_env (HsExtCore this_mod decls src_binds)
286 -- The decls are IfaceDecls; all names are original names
287 = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
289 initTc hsc_env ExtCoreFile this_mod $ do {
291 let { ldecls = map noLoc decls } ;
293 -- Deal with the type declarations; first bring their stuff
294 -- into scope, then rname them, then type check them
295 (rdr_env, imports) <- importsFromLocalDecls (mkFakeGroup ldecls) ;
297 updGblEnv (\gbl -> gbl { tcg_rdr_env = rdr_env `plusGlobalRdrEnv` tcg_rdr_env gbl,
298 tcg_imports = imports `plusImportAvails` tcg_imports gbl })
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,
401 tcg_binds = binds', tcg_rules = rules',
402 tcg_fords = fords' } } ;
404 -- Compare the hi-boot iface (if any) with the real thing
405 checkHiBootIface tcg_env' boot_iface ;
407 -- Make the new type env available to stuff slurped from interface files
408 writeMutVar (tcg_type_env_var tcg_env) final_type_env ;
413 tc_rn_src_decls :: ModDetails -> [LHsDecl RdrName] -> TcM (TcGblEnv, TcLclEnv)
414 -- Loops around dealing with each top level inter-splice group
415 -- in turn, until it's dealt with the entire module
416 tc_rn_src_decls boot_details ds
417 = do { let { (first_group, group_tail) = findSplice ds } ;
418 -- If ds is [] we get ([], Nothing)
420 -- Type check the decls up to, but not including, the first splice
421 tc_envs@(tcg_env,tcl_env) <- tcRnGroup boot_details first_group ;
423 -- Bale out if errors; for example, error recovery when checking
424 -- the RHS of 'main' can mean that 'main' is not in the envt for
425 -- the subsequent checkMain test
430 -- If there is no splice, we're nearly done
432 Nothing -> do { -- Last thing: check for `main'
433 tcg_env <- checkMain ;
434 return (tcg_env, tcl_env)
437 -- If there's a splice, we must carry on
438 Just (SpliceDecl splice_expr, rest_ds) -> do {
440 failWithTc (text "Can't do a top-level splice; need a bootstrapped compiler")
443 -- Rename the splice expression, and get its supporting decls
444 (rn_splice_expr, splice_fvs) <- rnLExpr splice_expr ;
445 failIfErrsM ; -- Don't typecheck if renaming failed
447 -- Execute the splice
448 spliced_decls <- tcSpliceDecls rn_splice_expr ;
450 -- Glue them on the front of the remaining decls and loop
451 setGblEnv (tcg_env `addTcgDUs` usesOnly splice_fvs) $
452 tc_rn_src_decls boot_details (spliced_decls ++ rest_ds)
457 %************************************************************************
459 Compiling hs-boot source files, and
460 comparing the hi-boot interface with the real thing
462 %************************************************************************
465 tcRnHsBootDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
466 tcRnHsBootDecls decls
467 = do { let { (first_group, group_tail) = findSplice decls }
470 Just stuff -> spliceInHsBootErr stuff
473 -- Rename the declarations
474 ; (tcg_env, rn_group) <- rnTopSrcDecls first_group
475 ; setGblEnv tcg_env $ do {
477 -- Todo: check no foreign decls, no rules, no default decls
479 -- Typecheck type/class decls
480 ; traceTc (text "Tc2")
481 ; let tycl_decls = hs_tyclds rn_group
482 ; tcg_env <- checkNoErrs (tcTyAndClassDecls emptyModDetails tycl_decls)
483 ; setGblEnv tcg_env $ do {
485 -- Typecheck instance decls
486 ; traceTc (text "Tc3")
487 ; (tcg_env, inst_infos, _binds) <- tcInstDecls1 tycl_decls (hs_instds rn_group)
488 ; setGblEnv tcg_env $ do {
490 -- Typecheck value declarations
491 ; traceTc (text "Tc5")
492 ; val_ids <- tcHsBootSigs (hs_valds rn_group)
495 -- No simplification or zonking to do
496 ; traceTc (text "Tc7a")
497 ; gbl_env <- getGblEnv
499 -- Make the final type-env
500 -- Include the dfun_ids so that their type sigs get
501 -- are written into the interface file
502 ; let { type_env0 = tcg_type_env gbl_env
503 ; type_env1 = extendTypeEnvWithIds type_env0 val_ids
504 ; type_env2 = extendTypeEnvWithIds type_env1 dfun_ids
505 ; dfun_ids = map iDFunId inst_infos }
506 ; return (gbl_env { tcg_type_env = type_env2 })
509 spliceInHsBootErr (SpliceDecl (L loc _), _)
510 = addErrAt loc (ptext SLIT("Splices are not allowed in hs-boot files"))
513 In both one-shot mode and GHCi mode, hi-boot interfaces are demand-loaded
514 into the External Package Table. Once we've typechecked the body of the
515 module, we want to compare what we've found (gathered in a TypeEnv) with
516 the hi-boot stuff in the EPT. We do so here, using the export list of
517 the hi-boot interface as our checklist.
520 checkHiBootIface :: TcGblEnv -> ModDetails -> TcM ()
521 -- Compare the hi-boot file for this module (if there is one)
522 -- with the type environment we've just come up with
523 -- In the common case where there is no hi-boot file, the list
524 -- of boot_names is empty.
526 (TcGblEnv { tcg_insts = local_insts, tcg_type_env = local_type_env })
527 (ModDetails { md_insts = boot_insts, md_types = boot_type_env })
528 = do { mapM_ check_inst boot_insts
529 ; mapM_ check_one (typeEnvElts boot_type_env) }
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 | null [i | i <- local_insts, idType i `tcEqType` idType inst]
549 = addErrTc (instMisMatch inst)
554 check_thing (ATyCon boot_tc) (ATyCon real_tc)
555 | isSynTyCon boot_tc && isSynTyCon real_tc,
556 defn1 `tcEqType` substTyWith tvs2 (mkTyVarTys tvs1) defn2
559 | tyConKind boot_tc == tyConKind real_tc
562 (tvs1, defn1) = getSynTyConDefn boot_tc
563 (tvs2, defn2) = getSynTyConDefn boot_tc
565 check_thing (AnId boot_id) (AnId real_id)
566 | idType boot_id `tcEqType` idType real_id
569 check_thing (ADataCon dc1) (ADataCon dc2)
570 | idType (dataConWrapId dc1) `tcEqType` idType (dataConWrapId dc2)
573 -- Can't declare a class in a hi-boot file
575 check_thing boot_thing real_thing -- Default case; failure
576 = addErrAt (srcLocSpan (getSrcLoc real_thing))
577 (bootMisMatch real_thing)
580 missingBootThing thing
581 = ppr thing <+> ptext SLIT("is defined in the hs-boot file, but not in the module")
583 = ppr thing <+> ptext SLIT("has conflicting definitions in the module and its hs-boot file")
585 = hang (ptext SLIT("instance") <+> ppr (idType inst))
586 2 (ptext SLIT("is defined in the hs-boot file, but not in the module"))
590 %************************************************************************
592 Type-checking the top level of a module
594 %************************************************************************
596 tcRnGroup takes a bunch of top-level source-code declarations, and
598 * gets supporting declarations from interface files
601 * and augments the TcGblEnv with the results
603 In Template Haskell it may be called repeatedly for each group of
604 declarations. It expects there to be an incoming TcGblEnv in the
605 monad; it augments it and returns the new TcGblEnv.
608 tcRnGroup :: ModDetails -> HsGroup RdrName -> TcM (TcGblEnv, TcLclEnv)
609 -- Returns the variables free in the decls, for unused-binding reporting
610 tcRnGroup boot_details decls
611 = do { -- Rename the declarations
612 (tcg_env, rn_decls) <- rnTopSrcDecls decls ;
613 setGblEnv tcg_env $ do {
615 -- Typecheck the declarations
616 tcTopSrcDecls boot_details rn_decls
619 ------------------------------------------------
620 rnTopSrcDecls :: HsGroup RdrName -> TcM (TcGblEnv, HsGroup Name)
622 = do { -- Bring top level binders into scope
623 (rdr_env, imports) <- importsFromLocalDecls group ;
624 updGblEnv (\gbl -> gbl { tcg_rdr_env = rdr_env `plusGlobalRdrEnv` tcg_rdr_env gbl,
625 tcg_imports = imports `plusImportAvails` tcg_imports gbl })
628 traceRn (ptext SLIT("rnTopSrcDecls") <+> ppr rdr_env) ;
629 failIfErrsM ; -- No point in continuing if (say) we have duplicate declarations
631 -- Rename the source decls
632 (tcg_env, rn_decls) <- rnSrcDecls group ;
635 -- save the renamed syntax, if we want it
637 | Just grp <- tcg_rn_decls tcg_env
638 = tcg_env{ tcg_rn_decls = Just (appendGroups grp rn_decls) }
642 -- Dump trace of renaming part
643 rnDump (ppr rn_decls) ;
645 return (tcg_env', rn_decls)
648 ------------------------------------------------
649 tcTopSrcDecls :: ModDetails -> HsGroup Name -> TcM (TcGblEnv, TcLclEnv)
650 tcTopSrcDecls boot_details
651 (HsGroup { hs_tyclds = tycl_decls,
652 hs_instds = inst_decls,
653 hs_fords = foreign_decls,
654 hs_defds = default_decls,
655 hs_ruleds = rule_decls,
656 hs_valds = val_binds })
657 = do { -- Type-check the type and class decls, and all imported decls
658 -- The latter come in via tycl_decls
659 traceTc (text "Tc2") ;
661 tcg_env <- checkNoErrs (tcTyAndClassDecls boot_details tycl_decls) ;
662 -- tcTyAndClassDecls recovers internally, but if anything gave rise to
663 -- an error we'd better stop now, to avoid a cascade
665 -- Make these type and class decls available to stuff slurped from interface files
666 writeMutVar (tcg_type_env_var tcg_env) (tcg_type_env tcg_env) ;
669 setGblEnv tcg_env $ do {
670 -- Source-language instances, including derivings,
671 -- and import the supporting declarations
672 traceTc (text "Tc3") ;
673 (tcg_env, inst_infos, deriv_binds) <- tcInstDecls1 tycl_decls inst_decls ;
674 setGblEnv tcg_env $ do {
676 -- Foreign import declarations next. No zonking necessary
677 -- here; we can tuck them straight into the global environment.
678 traceTc (text "Tc4") ;
679 (fi_ids, fi_decls) <- tcForeignImports foreign_decls ;
680 tcExtendGlobalValEnv fi_ids $ do {
682 -- Default declarations
683 traceTc (text "Tc4a") ;
684 default_tys <- tcDefaults default_decls ;
685 updGblEnv (\gbl -> gbl { tcg_default = default_tys }) $ do {
687 -- Value declarations next
688 -- We also typecheck any extra binds that came out
689 -- of the "deriving" process (deriv_binds)
690 traceTc (text "Tc5") ;
691 (tc_val_binds, lcl_env) <- tcTopBinds (val_binds ++ deriv_binds) ;
692 setLclTypeEnv lcl_env $ do {
694 -- Second pass over class and instance declarations,
695 traceTc (text "Tc6") ;
696 (tcl_env, inst_binds) <- tcInstDecls2 tycl_decls inst_infos ;
697 showLIE (text "after instDecls2") ;
700 -- They need to be zonked, so we return them
701 traceTc (text "Tc7") ;
702 (foe_binds, foe_decls) <- tcForeignExports foreign_decls ;
705 rules <- tcRules rule_decls ;
708 traceTc (text "Tc7a") ;
709 tcg_env <- getGblEnv ;
710 let { all_binds = tc_val_binds `unionBags`
711 inst_binds `unionBags`
714 -- Extend the GblEnv with the (as yet un-zonked)
715 -- bindings, rules, foreign decls
716 tcg_env' = tcg_env { tcg_binds = tcg_binds tcg_env `unionBags` all_binds,
717 tcg_rules = tcg_rules tcg_env ++ rules,
718 tcg_fords = tcg_fords tcg_env ++ foe_decls ++ fi_decls } } ;
719 return (tcg_env', lcl_env)
724 %************************************************************************
728 %************************************************************************
732 = do { ghci_mode <- getGhciMode ;
733 tcg_env <- getGblEnv ;
735 let { main_mod = case mainModIs dflags of {
736 Just mod -> mkModule mod ;
738 main_fn = case mainFunIs dflags of {
739 Just fn -> mkRdrUnqual (mkVarOcc (mkFastString fn)) ;
740 Nothing -> main_RDR_Unqual } } ;
742 check_main ghci_mode tcg_env main_mod main_fn
746 check_main ghci_mode tcg_env main_mod main_fn
747 -- If we are in module Main, check that 'main' is defined.
748 -- It may be imported from another module!
751 -- Blimey: a whole page of code to do this...
756 = addErrCtxt mainCtxt $
757 do { mb_main <- lookupSrcOcc_maybe main_fn
758 -- Check that 'main' is in scope
759 -- It might be imported from another module!
761 Nothing -> do { complain_no_main
764 { let { rhs = nlHsApp (nlHsVar runMainIOName) (nlHsVar main_name) }
765 -- :Main.main :: IO () = runMainIO main
767 ; (main_expr, ty) <- setSrcSpan (srcLocSpan (getSrcLoc main_name)) $
770 ; let { root_main_id = mkExportedLocalId rootMainName ty ;
771 main_bind = noLoc (VarBind root_main_id main_expr) }
773 ; return (tcg_env { tcg_binds = tcg_binds tcg_env
775 tcg_dus = tcg_dus tcg_env
776 `plusDU` usesOnly (unitFV main_name)
777 -- Record the use of 'main', so that we don't
778 -- complain about it being defined but not used
782 mod = tcg_mod tcg_env
784 complain_no_main | ghci_mode == Interactive = return ()
785 | otherwise = failWithTc noMainMsg
786 -- In interactive mode, don't worry about the absence of 'main'
787 -- In other modes, fail altogether, so that we don't go on
788 -- and complain a second time when processing the export list.
790 mainCtxt = ptext SLIT("When checking the type of the main function") <+> quotes (ppr main_fn)
791 noMainMsg = ptext SLIT("The main function") <+> quotes (ppr main_fn)
792 <+> ptext SLIT("is not defined in module") <+> quotes (ppr main_mod)
795 %*********************************************************
799 %*********************************************************
803 setInteractiveContext :: HscEnv -> InteractiveContext -> TcRn a -> TcRn a
804 setInteractiveContext hsc_env icxt thing_inside
806 -- Initialise the tcg_inst_env with instances
807 -- from all home modules. This mimics the more selective
808 -- call to hptInstances in tcRnModule
809 dfuns = hptInstances hsc_env (\mod -> True)
811 updGblEnv (\env -> env {
812 tcg_rdr_env = ic_rn_gbl_env icxt,
813 tcg_type_env = ic_type_env icxt,
814 tcg_inst_env = extendInstEnvList (tcg_inst_env env) dfuns }) $
816 updLclEnv (\env -> env { tcl_rdr = ic_rn_local_env icxt }) $
818 do { traceTc (text "setIC" <+> ppr (ic_type_env icxt))
825 -> InteractiveContext
827 -> IO (Maybe (InteractiveContext, [Name], LHsExpr Id))
828 -- The returned [Name] is the same as the input except for
829 -- ExprStmt, in which case the returned [Name] is [itName]
831 -- The returned TypecheckedHsExpr is of type IO [ () ],
832 -- a list of the bound values, coerced to ().
834 tcRnStmt hsc_env ictxt rdr_stmt
835 = initTcPrintErrors hsc_env iNTERACTIVE $
836 setInteractiveContext hsc_env ictxt $ do {
838 -- Rename; use CmdLineMode because tcRnStmt is only used interactively
839 (([rn_stmt], _), fvs) <- rnStmts DoExpr [rdr_stmt] (return ((), emptyFVs)) ;
840 traceRn (text "tcRnStmt" <+> vcat [ppr rdr_stmt, ppr rn_stmt, ppr fvs]) ;
843 -- The real work is done here
844 (bound_ids, tc_expr) <- tcUserStmt rn_stmt ;
846 traceTc (text "tcs 1") ;
847 let { -- (a) Make all the bound ids "global" ids, now that
848 -- they're notionally top-level bindings. This is
849 -- important: otherwise when we come to compile an expression
850 -- using these ids later, the byte code generator will consider
851 -- the occurrences to be free rather than global.
853 -- (b) Tidy their types; this is important, because :info may
854 -- ask to look at them, and :info expects the things it looks
855 -- up to have tidy types
856 global_ids = map globaliseAndTidy bound_ids ;
858 -- Update the interactive context
859 rn_env = ic_rn_local_env ictxt ;
860 type_env = ic_type_env ictxt ;
862 bound_names = map idName global_ids ;
863 new_rn_env = extendLocalRdrEnv rn_env bound_names ;
865 -- Remove any shadowed bindings from the type_env;
866 -- they are inaccessible but might, I suppose, cause
867 -- a space leak if we leave them there
868 shadowed = [ n | name <- bound_names,
869 let rdr_name = mkRdrUnqual (nameOccName name),
870 Just n <- [lookupLocalRdrEnv rn_env rdr_name] ] ;
872 filtered_type_env = delListFromNameEnv type_env shadowed ;
873 new_type_env = extendTypeEnvWithIds filtered_type_env global_ids ;
875 new_ic = ictxt { ic_rn_local_env = new_rn_env,
876 ic_type_env = new_type_env }
879 dumpOptTcRn Opt_D_dump_tc
880 (vcat [text "Bound Ids" <+> pprWithCommas ppr global_ids,
881 text "Typechecked expr" <+> ppr tc_expr]) ;
883 returnM (new_ic, bound_names, tc_expr)
886 globaliseAndTidy :: Id -> Id
888 -- Give the Id a Global Name, and tidy its type
889 = setIdType (globaliseId VanillaGlobal id) tidy_type
891 tidy_type = tidyTopType (idType id)
894 Here is the grand plan, implemented in tcUserStmt
896 What you type The IO [HValue] that hscStmt returns
897 ------------- ------------------------------------
898 let pat = expr ==> let pat = expr in return [coerce HVal x, coerce HVal y, ...]
901 pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...]
904 expr (of IO type) ==> expr >>= \ it -> return [coerce HVal it]
905 [NB: result not printed] bindings: [it]
907 expr (of non-IO type, ==> let it = expr in print it >> return [coerce HVal it]
908 result showable) bindings: [it]
910 expr (of non-IO type,
911 result not showable) ==> error
915 ---------------------------
916 tcUserStmt :: LStmt Name -> TcM ([Id], LHsExpr Id)
917 tcUserStmt (L loc (ExprStmt expr _ _))
918 = newUnique `thenM` \ uniq ->
920 fresh_it = itName uniq
921 the_bind = noLoc $ FunBind (noLoc fresh_it) False
922 (mkMatchGroup [mkSimpleMatch [] expr])
924 tryTcLIE_ (do { -- Try this if the other fails
925 traceTc (text "tcs 1b") ;
926 tc_stmts (map (L loc) [
927 LetStmt [HsBindGroup (unitBag the_bind) [] NonRecursive],
928 ExprStmt (nlHsApp (nlHsVar printName) (nlHsVar fresh_it))
929 (HsVar thenIOName) placeHolderType
931 (do { -- Try this first
932 traceTc (text "tcs 1a") ;
933 tc_stmts [L loc (BindStmt (nlVarPat fresh_it) expr
934 (HsVar bindIOName) noSyntaxExpr) ] })
936 tcUserStmt stmt = tc_stmts [stmt]
938 ---------------------------
939 tc_stmts :: [LStmt Name] -> TcM ([Id], LHsExpr Id)
941 = do { ioTyCon <- tcLookupTyCon ioTyConName ;
943 ret_ty = mkListTy unitTy ;
944 io_ret_ty = mkTyConApp ioTyCon [ret_ty] ;
946 names = map unLoc (collectLStmtsBinders stmts) ;
948 -- mk_return builds the expression
949 -- returnIO @ [()] [coerce () x, .., coerce () z]
951 -- Despite the inconvenience of building the type applications etc,
952 -- this *has* to be done in type-annotated post-typecheck form
953 -- because we are going to return a list of *polymorphic* values
954 -- coerced to type (). If we built a *source* stmt
955 -- return [coerce x, ..., coerce z]
956 -- then the type checker would instantiate x..z, and we wouldn't
957 -- get their *polymorphic* values. (And we'd get ambiguity errs
958 -- if they were overloaded, since they aren't applied to anything.)
959 mk_return ret_id ids = nlHsApp (noLoc $ TyApp (nlHsVar ret_id) [ret_ty])
960 (noLoc $ ExplicitList unitTy (map mk_item ids)) ;
961 mk_item id = nlHsApp (noLoc $ TyApp (nlHsVar unsafeCoerceId) [idType id, unitTy])
964 io_ty = mkTyConApp ioTyCon []
967 -- OK, we're ready to typecheck the stmts
968 traceTc (text "tcs 2") ;
969 ((ids, tc_expr), lie) <- getLIE $ do {
970 (tc_stmts, ids) <- tcStmts DoExpr (tcDoStmt io_ty io_ret_ty) stmts $
972 -- Look up the names right in the middle,
973 -- where they will all be in scope
974 ids <- mappM tcLookupId names ;
977 ret_id <- tcLookupId returnIOName ; -- return @ IO
978 return (ids, noLoc (HsDo DoExpr tc_stmts (mk_return ret_id ids) io_ret_ty))
981 -- Simplify the context right here, so that we fail
982 -- if there aren't enough instances. Notably, when we see
984 -- we use recoverTc_ to try it <- e
985 -- and then let it = e
986 -- It's the simplify step that rejects the first.
987 traceTc (text "tcs 3") ;
988 const_binds <- tcSimplifyInteractive lie ;
990 -- Build result expression and zonk it
991 let { expr = mkHsLet const_binds tc_expr } ;
992 zonked_expr <- zonkTopLExpr expr ;
993 zonked_ids <- zonkTopBndrs ids ;
995 -- None of the Ids should be of unboxed type, because we
996 -- cast them all to HValues in the end!
997 mappM bad_unboxed (filter (isUnLiftedType . idType) zonked_ids) ;
999 return (zonked_ids, zonked_expr)
1002 bad_unboxed id = addErr (sep [ptext SLIT("GHCi can't bind a variable of unlifted type:"),
1003 nest 2 (ppr id <+> dcolon <+> ppr (idType id))])
1007 tcRnExpr just finds the type of an expression
1011 -> InteractiveContext
1014 tcRnExpr hsc_env ictxt rdr_expr
1015 = initTcPrintErrors hsc_env iNTERACTIVE $
1016 setInteractiveContext hsc_env ictxt $ do {
1018 (rn_expr, fvs) <- rnLExpr rdr_expr ;
1021 -- Now typecheck the expression;
1022 -- it might have a rank-2 type (e.g. :t runST)
1023 ((tc_expr, res_ty), lie) <- getLIE (tcInferRho rn_expr) ;
1024 ((qtvs, _, dict_ids), lie_top) <- getLIE (tcSimplifyInfer smpl_doc (tyVarsOfType res_ty) lie) ;
1025 tcSimplifyInteractive lie_top ;
1026 qtvs' <- mappM zonkQuantifiedTyVar qtvs ;
1028 let { all_expr_ty = mkForAllTys qtvs' $
1029 mkFunTys (map idType dict_ids) $
1031 zonkTcType all_expr_ty
1034 smpl_doc = ptext SLIT("main expression")
1037 tcRnType just finds the kind of a type
1041 -> InteractiveContext
1044 tcRnType hsc_env ictxt rdr_type
1045 = initTcPrintErrors hsc_env iNTERACTIVE $
1046 setInteractiveContext hsc_env ictxt $ do {
1048 rn_type <- rnLHsType doc rdr_type ;
1051 -- Now kind-check the type
1052 (ty', kind) <- kcHsType rn_type ;
1056 doc = ptext SLIT("In GHCi input")
1062 %************************************************************************
1064 More GHCi stuff, to do with browsing and getting info
1066 %************************************************************************
1070 mkExportEnv :: HscEnv -> [Module] -- Expose these modules' exports only
1072 mkExportEnv hsc_env exports
1073 = do { mb_envs <- initTcPrintErrors hsc_env iNTERACTIVE $
1074 mappM getModuleExports exports
1076 Just envs -> return (foldr plusGlobalRdrEnv emptyGlobalRdrEnv envs)
1077 Nothing -> return emptyGlobalRdrEnv
1078 -- Some error; initTc will have printed it
1081 getModuleExports :: Module -> TcM GlobalRdrEnv
1082 getModuleExports mod
1083 = do { iface <- load_iface mod
1084 ; loadOrphanModules (dep_orphs (mi_deps iface))
1085 -- Load any orphan-module interfaces,
1086 -- so their instances are visible
1087 ; names <- ifaceExportNames (mi_exports iface)
1088 ; let { gres = [ GRE { gre_name = name, gre_prov = vanillaProv mod }
1089 | name <- nameSetToList names ] }
1090 ; returnM (mkGlobalRdrEnv gres) }
1092 vanillaProv :: Module -> Provenance
1093 -- We're building a GlobalRdrEnv as if the user imported
1094 -- all the specified modules into the global interactive module
1095 vanillaProv mod = Imported [ImportSpec mod mod False
1096 (srcLocSpan interactiveSrcLoc)] False
1102 -> Module -- Module to inspect
1103 -> Bool -- Grab just the exports, or the whole toplev
1104 -> IO (Maybe [IfaceDecl])
1106 getModuleContents hsc_env mod exports_only
1107 = initTcPrintErrors hsc_env iNTERACTIVE (get_mod_contents exports_only)
1109 get_mod_contents exports_only
1110 | not exports_only -- We want the whole top-level type env
1111 -- so it had better be a home module
1112 = do { hpt <- getHpt
1113 ; case lookupModuleEnv hpt mod of
1114 Just mod_info -> return (map (toIfaceDecl ext_nm) $
1117 md_types (hm_details mod_info))
1118 Nothing -> ghcError (ProgramError (showSDoc (noRdrEnvErr mod)))
1119 -- This is a system error; the module should be in the HPT
1122 | otherwise -- Want the exports only
1123 = do { iface <- load_iface mod
1124 ; mappM get_decl [ (mod,avail) | (mod, avails) <- mi_exports iface
1128 get_decl (mod, avail)
1129 = do { main_name <- lookupOrig mod (availName avail)
1130 ; thing <- tcLookupGlobal main_name
1131 ; return (filter_decl (availNames avail) (toIfaceDecl ext_nm thing)) }
1133 ext_nm = interactiveExtNameFun (icPrintUnqual (hsc_IC hsc_env))
1135 ---------------------
1136 filter_decl occs decl@(IfaceClass {ifSigs = sigs})
1137 = decl { ifSigs = filter (keep_sig occs) sigs }
1138 filter_decl occs decl@(IfaceData {ifCons = IfDataTyCon th cons})
1139 = decl { ifCons = IfDataTyCon th (filter (keep_con occs) cons) }
1140 filter_decl occs decl@(IfaceData {ifCons = IfNewTyCon con})
1141 | keep_con occs con = decl
1142 | otherwise = decl {ifCons = IfAbstractTyCon} -- Hmm?
1143 filter_decl occs decl
1146 keep_sig occs (IfaceClassOp occ _ _) = occ `elem` occs
1147 keep_con occs con = ifConOcc con `elem` occs
1149 wantToSee (AnId id) = not (isImplicitId id)
1150 wantToSee (ADataCon _) = False -- They'll come via their TyCon
1153 ---------------------
1154 load_iface mod = loadSrcInterface doc mod False {- Not boot iface -}
1156 doc = ptext SLIT("context for compiling statements")
1158 ---------------------
1159 noRdrEnvErr mod = ptext SLIT("No top-level environment available for module")
1160 <+> quotes (ppr mod)
1164 type GetInfoResult = (String, IfaceDecl, Fixity, SrcLoc,
1165 [(IfaceType,SrcLoc)] -- Instances
1168 tcRnLookupRdrName :: HscEnv -> RdrName -> IO (Maybe [Name])
1170 tcRnLookupRdrName hsc_env rdr_name
1171 = initTcPrintErrors hsc_env iNTERACTIVE $
1172 setInteractiveContext hsc_env (hsc_IC hsc_env) $
1173 lookup_rdr_name rdr_name
1176 lookup_rdr_name rdr_name = do {
1177 -- If the identifier is a constructor (begins with an
1178 -- upper-case letter), then we need to consider both
1179 -- constructor and type class identifiers.
1180 let { rdr_names = dataTcOccs rdr_name } ;
1182 -- results :: [(Messages, Maybe Name)]
1183 results <- mapM (tryTc . lookupOccRn) rdr_names ;
1185 traceRn (text "xx" <+> vcat [ppr rdr_names, ppr (map snd results)]);
1186 -- The successful lookups will be (Just name)
1187 let { (warns_s, good_names) = unzip [ (msgs, name)
1188 | (msgs, Just name) <- results] ;
1189 errs_s = [msgs | (msgs, Nothing) <- results] } ;
1191 -- Fail if nothing good happened, else add warnings
1192 if null good_names then
1193 -- No lookup succeeded, so
1194 -- pick the first error message and report it
1195 -- ToDo: If one of the errors is "could be Foo.X or Baz.X",
1196 -- while the other is "X is not in scope",
1197 -- we definitely want the former; but we might pick the latter
1198 do { addMessages (head errs_s) ; failM }
1199 else -- Add deprecation warnings
1200 mapM_ addMessages warns_s ;
1206 tcRnGetInfo :: HscEnv
1207 -> InteractiveContext
1209 -> IO (Maybe [GetInfoResult])
1211 -- Used to implemnent :info in GHCi
1213 -- Look up a RdrName and return all the TyThings it might be
1214 -- A capitalised RdrName is given to us in the DataName namespace,
1215 -- but we want to treat it as *both* a data constructor
1216 -- *and* as a type or class constructor;
1217 -- hence the call to dataTcOccs, and we return up to two results
1218 tcRnGetInfo hsc_env ictxt rdr_name
1219 = initTcPrintErrors hsc_env iNTERACTIVE $
1220 setInteractiveContext hsc_env ictxt $ do {
1222 good_names <- lookup_rdr_name rdr_name ;
1224 -- And lookup up the entities, avoiding duplicates, which arise
1225 -- because constructors and record selectors are represented by
1226 -- their parent declaration
1227 let { do_one name = do { thing <- tcLookupGlobal name
1228 ; fixity <- lookupFixityRn name
1229 ; dfuns <- lookupInsts ext_nm thing
1230 ; return (str, toIfaceDecl ext_nm thing, fixity,
1232 [(toIfaceType ext_nm (idType dfun), getSrcLoc dfun) | dfun <- dfuns]
1235 -- str is the the naked occurrence name
1236 -- after stripping off qualification and parens (+)
1237 str = occNameUserString (nameOccName name)
1240 -- For the SrcLoc, the 'thing' has better info than
1241 -- the 'name' because getting the former forced the
1242 -- declaration to be loaded into the cache
1244 results <- mapM do_one good_names ;
1245 return (fst (removeDups cmp results))
1248 cmp (_,d1,_,_,_) (_,d2,_,_,_) = ifName d1 `compare` ifName d2
1249 ext_nm = interactiveExtNameFun (icPrintUnqual ictxt)
1252 lookupInsts :: (Name -> IfaceExtName) -> TyThing -> TcM [DFunId]
1253 -- Filter the instances by the ones whose tycons (or clases resp)
1254 -- are in scope unqualified. Otherwise we list a whole lot too many!
1255 lookupInsts ext_nm (AClass cls)
1256 = do { loadImportedInsts cls [] -- [] means load all instances for cls
1257 ; inst_envs <- tcGetInstEnvs
1259 | (_,_,dfun) <- classInstances inst_envs cls
1260 , let (_, tycons) = ifaceInstGates (ifInstHead (dfunToIfaceInst ext_nm dfun))
1261 -- Rather an indirect/inefficient test, but there we go
1262 , all print_tycon_unqual tycons ] }
1264 print_tycon_unqual (IfaceTc nm) = isLocalIfaceExtName nm
1265 print_tycon_unqual other = True -- Int etc
1268 lookupInsts ext_nm (ATyCon tc)
1269 = do { eps <- getEps -- Load all instances for all classes that are
1270 -- in the type environment (which are all the ones
1271 -- we've seen in any interface file so far)
1272 ; mapM_ (\c -> loadImportedInsts c [])
1273 (typeEnvClasses (eps_PTE eps))
1274 ; (pkg_ie, home_ie) <- tcGetInstEnvs -- Search all
1276 | (_, _, dfun) <- instEnvElts home_ie ++ instEnvElts pkg_ie
1278 , let (cls, _) = ifaceInstGates (ifInstHead (dfunToIfaceInst ext_nm dfun))
1279 , isLocalIfaceExtName cls ] }
1281 relevant df = tc_name `elemNameSet` tyClsNamesOfDFunHead (idType df)
1282 tc_name = tyConName tc
1284 lookupInsts ext_nm other = return []
1287 toIfaceDecl :: (Name -> IfaceExtName) -> TyThing -> IfaceDecl
1288 toIfaceDecl ext_nm thing
1289 = tyThingToIfaceDecl True -- Discard IdInfo
1290 emptyNameSet -- Show data cons
1291 ext_nm (munge thing)
1293 -- munge transforms a thing to its "parent" thing
1294 munge (ADataCon dc) = ATyCon (dataConTyCon dc)
1295 munge (AnId id) = case globalIdDetails id of
1296 RecordSelId tc lbl -> ATyCon tc
1297 ClassOpId cls -> AClass cls
1299 munge other_thing = other_thing
1303 %************************************************************************
1307 %************************************************************************
1310 rnDump :: SDoc -> TcRn ()
1311 -- Dump, with a banner, if -ddump-rn
1312 rnDump doc = do { dumpOptTcRn Opt_D_dump_rn (mkDumpDoc "Renamer" doc) }
1314 tcDump :: TcGblEnv -> TcRn ()
1316 = do { dflags <- getDOpts ;
1318 -- Dump short output if -ddump-types or -ddump-tc
1319 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1320 (dumpTcRn short_dump) ;
1322 -- Dump bindings if -ddump-tc
1323 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump)
1326 short_dump = pprTcGblEnv env
1327 full_dump = pprLHsBinds (tcg_binds env)
1328 -- NB: foreign x-d's have undefined's in their types;
1329 -- hence can't show the tc_fords
1332 = do { dflags <- getDOpts ;
1333 ifM (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
1334 (dumpTcRn (pprModGuts mod_guts)) ;
1336 -- Dump bindings if -ddump-tc
1337 dumpOptTcRn Opt_D_dump_tc (mkDumpDoc "Typechecker" full_dump) }
1339 full_dump = pprCoreBindings (mg_binds mod_guts)
1341 -- It's unpleasant having both pprModGuts and pprModDetails here
1342 pprTcGblEnv :: TcGblEnv -> SDoc
1343 pprTcGblEnv (TcGblEnv { tcg_type_env = type_env,
1344 tcg_insts = dfun_ids,
1346 tcg_imports = imports })
1347 = vcat [ ppr_types dfun_ids type_env
1348 , ppr_insts dfun_ids
1349 , vcat (map ppr rules)
1350 , ppr_gen_tycons (typeEnvTyCons type_env)
1351 , ptext SLIT("Dependent modules:") <+> ppr (moduleEnvElts (imp_dep_mods imports))
1352 , ptext SLIT("Dependent packages:") <+> ppr (imp_dep_pkgs imports)]
1354 pprModGuts :: ModGuts -> SDoc
1355 pprModGuts (ModGuts { mg_types = type_env,
1357 = vcat [ ppr_types [] type_env,
1361 ppr_types :: [Var] -> TypeEnv -> SDoc
1362 ppr_types dfun_ids type_env
1363 = text "TYPE SIGNATURES" $$ nest 4 (ppr_sigs ids)
1365 ids = [id | id <- typeEnvIds type_env, want_sig id]
1366 want_sig id | opt_PprStyle_Debug = True
1367 | otherwise = isLocalId id &&
1368 isExternalName (idName id) &&
1369 not (id `elem` dfun_ids)
1370 -- isLocalId ignores data constructors, records selectors etc.
1371 -- The isExternalName ignores local dictionary and method bindings
1372 -- that the type checker has invented. Top-level user-defined things
1373 -- have External names.
1375 ppr_insts :: [Var] -> SDoc
1376 ppr_insts [] = empty
1377 ppr_insts dfun_ids = text "INSTANCES" $$ nest 4 (ppr_sigs dfun_ids)
1379 ppr_sigs :: [Var] -> SDoc
1381 -- Print type signatures; sort by OccName
1382 = vcat (map ppr_sig (sortLe le_sig ids))
1384 le_sig id1 id2 = getOccName id1 <= getOccName id2
1385 ppr_sig id = ppr id <+> dcolon <+> ppr (tidyTopType (idType id))
1387 ppr_rules :: [IdCoreRule] -> SDoc
1388 ppr_rules [] = empty
1389 ppr_rules rs = vcat [ptext SLIT("{-# RULES"),
1390 nest 4 (pprIdRules rs),
1393 ppr_gen_tycons [] = empty
1394 ppr_gen_tycons tcs = vcat [ptext SLIT("Tycons with generics:"),
1395 nest 2 (fsep (map ppr (filter tyConHasGenerics tcs)))]