X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypecheck%2FTcIfaceSig.lhs;h=4956bdbf99368e40c5d000ef08c5f954d2ebeb21;hb=d6b7d200353e0bcc5a19a43caf252f37dee5bc6c;hp=c4a59f33ec38d1fffbead4a9a9e72e20e4de739e;hpb=6e5c95e9102581703b8cb2734b87d7958bce4183;p=ghc-hetmet.git diff --git a/ghc/compiler/typecheck/TcIfaceSig.lhs b/ghc/compiler/typecheck/TcIfaceSig.lhs index c4a59f3..4956bdb 100644 --- a/ghc/compiler/typecheck/TcIfaceSig.lhs +++ b/ghc/compiler/typecheck/TcIfaceSig.lhs @@ -4,52 +4,44 @@ \section[TcIfaceSig]{Type checking of type signatures in interface files} \begin{code} -module TcIfaceSig ( tcInterfaceSigs, tcVar, tcCoreExpr, tcCoreLamBndrs ) where +module TcIfaceSig ( tcInterfaceSigs, + tcCoreExpr, + tcCoreLamBndrs, + tcCoreBinds ) where #include "HsVersions.h" -import HsSyn ( HsDecl(..), IfaceSig(..) ) -import TcMonad -import TcMonoType ( tcHsType, tcHsTypeKind, - -- NB: all the tyars in interface files are kinded, - -- so tcHsType will do the Right Thing without - -- having to mess about with zonking - tcExtendTyVarScope - ) -import TcEnv ( ValueEnv, tcExtendTyVarEnv, - tcExtendGlobalValEnv, tcSetValueEnv, - tcLookupTyConByKey, tcLookupValueMaybe, - explicitLookupValue, badCon, badPrimOp, valueEnvIds - ) -import TcType ( TcKind, kindToTcKind ) - -import RnHsSyn ( RenamedHsDecl ) +import HsSyn ( CoreDecl(..), TyClDecl(..), HsTupCon(..) ) +import TcHsSyn ( TypecheckedCoreBind ) +import TcRnTypes +import TcRnMonad +import TcMonoType ( tcIfaceType, kcHsSigType ) +import TcEnv ( tcExtendTyVarEnv, tcExtendGlobalValEnv, tcLookupGlobalId, + tcLookupDataCon ) + +import RnHsSyn ( RenamedCoreDecl, RenamedTyClDecl ) import HsCore -import CallConv ( cCallConv ) -import Const ( Con(..), Literal(..) ) +import Literal ( Literal(..) ) import CoreSyn -import CoreUtils ( coreExprType ) +import CoreUtils ( exprType ) import CoreUnfold import CoreLint ( lintUnfolding ) import WorkWrap ( mkWrapper ) -import PrimOp ( PrimOp(..) ) -import Id ( Id, mkId, mkVanillaId, - isPrimitiveId_maybe, isDataConId_maybe - ) +import Id ( Id, mkVanillaGlobal, mkLocalId ) +import MkId ( mkFCallId ) import IdInfo -import DataCon ( dataConSig, dataConArgTys ) -import Type ( mkSynTy, mkTyVarTys, splitAlgTyConApp, unUsgTy ) -import Var ( IdOrTyVar, mkTyVar, tyVarKind ) -import VarEnv -import Name ( Name, NamedThing(..), isLocallyDefined ) -import Unique ( rationalTyConKey ) -import TysWiredIn ( integerTy, stringTy ) -import Demand ( wwLazy ) -import ErrUtils ( pprBagOfErrors ) -import Maybes ( maybeToBool, MaybeErr(..) ) +import TyCon ( tyConDataCons, tyConTyVars ) +import DataCon ( DataCon, dataConWorkId, dataConExistentialTyVars, dataConArgTys ) +import Type ( mkTyVarTys, splitTyConApp ) +import TysWiredIn ( tupleCon ) +import Var ( mkTyVar, tyVarKind ) +import Name ( Name ) +import UniqSupply ( initUs_ ) import Outputable -import Util ( zipWithEqual ) +import Util ( zipWithEqual, dropList, equalLength ) +import HscTypes ( typeEnvIds ) +import CmdLineOpts ( DynFlag(..) ) \end{code} Ultimately, type signatures in interfaces will have pragmatic @@ -60,262 +52,241 @@ As always, we do not have to worry about user-pragmas in interface signatures. \begin{code} -tcInterfaceSigs :: ValueEnv -- Envt to use when checking unfoldings - -> [RenamedHsDecl] -- Ignore non-sig-decls in these decls - -> TcM s [Id] +tcInterfaceSigs :: [RenamedTyClDecl] -- Ignore non-sig-decls in these decls + -> TcM TcGblEnv - -tcInterfaceSigs unf_env decls - = listTc [ do_one name ty id_infos src_loc - | SigD (IfaceSig name ty id_infos src_loc) <- decls] +tcInterfaceSigs decls = fixM (tc_interface_sigs decls) + -- We tie a knot so that the Ids read out of interfaces are in scope + -- when we read their pragmas. + -- What we rely on is that pragmas are typechecked lazily; if + -- any type errors are found (ie there's an inconsistency) + -- we silently discard the pragma + -- + -- NOTE ALSO: the knot is in two parts: + -- * Ids defined in this module are added to the typechecker envt + -- which is knot-tied by the fixM. + -- * Imported Ids are side-effected into the PCS by the + -- tcExtendGlobalValueEnv, so they will be seen there provided + -- we don't look them up too early. + -- In both cases, we must defer lookups until after the knot is tied + -- + -- We used to have a much bigger loop (in TcRnDriver), so that the + -- interface pragmas could mention variables bound in this module + -- (by mutual recn), but + -- (a) the knot is tiresomely big, and + -- (b) it black-holes when we have Template Haskell + -- + -- For (b) consider: f = $(...h....) + -- where h is imported, and calls f via an hi-boot file. + -- This is bad! But it is not seen as a staging error, because h + -- is indeed imported. We don't want the type-checker to black-hole + -- when simplifying and compiling the splice! + -- + -- Simple solution: discard any unfolding that mentions a variable + -- bound in this module (and hence not yet processed). + -- The discarding happens when forkM finds a type error. + +tc_interface_sigs decls unf_env + = sequenceM [do_one d | d@(IfaceSig {}) <- decls] `thenM` \ sig_ids -> + tcExtendGlobalValEnv sig_ids getGblEnv + -- Return the extended environment where - in_scope_vars = filter isLocallyDefined (valueEnvIds unf_env) - - do_one name ty id_infos src_loc - = tcAddSrcLoc src_loc $ - tcAddErrCtxt (ifaceSigCtxt name) $ - tcHsType ty `thenTc` \ sigma_ty -> + in_scope_vars = typeEnvIds (tcg_type_env unf_env) + -- When we have hi-boot files, an unfolding might refer to + -- something defined in this module, so we must build a + -- suitable in-scope set. This thunk will only be poked + -- if -dcore-lint is on. + + do_one IfaceSig {tcdName = name, tcdType = ty, + tcdIdInfo = id_infos, tcdLoc = src_loc} + = addSrcLoc src_loc $ + addErrCtxt (ifaceSigCtxt name) $ + tcIfaceType ty `thenM` \ sigma_ty -> tcIdInfo unf_env in_scope_vars name - sigma_ty vanillaIdInfo id_infos `thenTc` \ id_info -> - returnTc (mkId name sigma_ty id_info) + sigma_ty id_infos `thenM` \ id_info -> + returnM (mkVanillaGlobal name sigma_ty id_info) \end{code} \begin{code} -tcIdInfo unf_env in_scope_vars name ty info info_ins - = foldlTc tcPrag vanillaIdInfo info_ins +tcIdInfo unf_env in_scope_vars name ty info_ins + = setGblEnv unf_env $ + -- Use the knot-tied environment for the IdInfo + -- In particular: typechecking unfoldings and worker names + foldlM tcPrag init_info info_ins where - tcPrag info (HsArity arity) = returnTc (info `setArityInfo` arity) - tcPrag info (HsUpdate upd) = returnTc (info `setUpdateInfo` upd) - tcPrag info (HsNoCafRefs) = returnTc (info `setCafInfo` NoCafRefs) - tcPrag info (HsCprInfo cpr_info) = returnTc (info `setCprInfo` cpr_info) - - tcPrag info (HsUnfold inline_prag maybe_expr) - = (case maybe_expr of - Just expr -> tcPragExpr unf_env name in_scope_vars expr - Nothing -> returnNF_Tc Nothing - ) `thenNF_Tc` \ maybe_expr' -> + -- Set the CgInfo to something sensible but uninformative before + -- we start; default assumption is that it has CAFs + init_info = hasCafIdInfo + + tcPrag info HsNoCafRefs = returnM (info `setCafInfo` NoCafRefs) + tcPrag info (HsArity arity) = returnM (info `setArityInfo` arity) + tcPrag info (HsStrictness str) = returnM (info `setAllStrictnessInfo` Just str) + tcPrag info (HsWorker nm arity) = tcWorkerInfo ty info nm arity + + tcPrag info (HsUnfold inline_prag expr) + = tcPragExpr name in_scope_vars expr `thenM` \ maybe_expr' -> let - -- maybe_expr doesn't get looked at if the unfolding + -- maybe_expr' doesn't get looked at if the unfolding -- is never inspected; so the typecheck doesn't even happen unfold_info = case maybe_expr' of Nothing -> noUnfolding - Just expr' -> mkUnfolding expr' - info1 = info `setUnfoldingInfo` unfold_info - info2 = info1 `setInlinePragInfo` inline_prag + Just expr' -> mkTopUnfolding expr' in - returnTc info2 - - tcPrag info (HsStrictness (HsStrictnessInfo (demands,bot_result))) - = returnTc (info `setStrictnessInfo` StrictnessInfo demands bot_result) - - tcPrag info (HsWorker nm) - = tcWorkerInfo unf_env ty info nm + returnM (info `setUnfoldingInfoLazily` unfold_info + `setInlinePragInfo` inline_prag) \end{code} \begin{code} -tcWorkerInfo unf_env ty info worker_name - | not (hasArity arity_info) - = pprPanic "Worker with no arity info" (ppr worker_name) - - | otherwise - = uniqSMToTcM (mkWrapper ty arity demands cpr_info) `thenNF_Tc` \ wrap_fn -> - let +tcWorkerInfo ty info wkr_name arity + = forkM doc (tcVar wkr_name) `thenM` \ maybe_wkr_id -> -- Watch out! We can't pull on unf_env too eagerly! - info' = case explicitLookupValue unf_env worker_name of - Just worker_id -> info `setUnfoldingInfo` mkUnfolding (wrap_fn worker_id) - `setWorkerInfo` Just worker_id + -- Hence the forkM + + -- We return without testing maybe_wkr_id, but as soon as info is + -- looked at we will test it. That's ok, because its outside the + -- knot; and there seems no big reason to further defer the + -- tcVar lookup. (Contrast with tcPragExpr, where postponing walking + -- over the unfolding until it's actually used does seem worth while.) + newUniqueSupply `thenM` \ us -> + returnM (case maybe_wkr_id of + Nothing -> info + Just wkr_id -> info `setUnfoldingInfoLazily` mk_unfolding us wkr_id + `setWorkerInfo` HasWorker wkr_id arity) - Nothing -> pprTrace "tcWorkerInfo failed:" (ppr worker_name) info - in - returnTc info' where - -- We are relying here on arity, cpr and strictness info always appearing + doc = text "worker for" <+> ppr wkr_name + + mk_unfolding us wkr_id = mkTopUnfolding (initUs_ us (mkWrapper ty strict_sig) wkr_id) + + -- We are relying here on strictness info always appearing -- before worker info, fingers crossed .... - arity_info = arityInfo info - arity = arityLowerBound arity_info - cpr_info = cprInfo info - demands = case strictnessInfo info of - StrictnessInfo d _ -> d - _ -> take arity (repeat wwLazy) -- Noncommittal + strict_sig = case newStrictnessInfo info of + Just sig -> sig + Nothing -> pprPanic "Worker info but no strictness for" (ppr wkr_name) \end{code} For unfoldings we try to do the job lazily, so that we never type check an unfolding that isn't going to be looked at. \begin{code} -tcPragExpr unf_env name in_scope_vars expr - = tcDelay unf_env doc $ - tcCoreExpr expr `thenTc` \ core_expr' -> +tcPragExpr :: Name -> [Id] -> UfExpr Name -> TcM (Maybe CoreExpr) +tcPragExpr name in_scope_vars expr + = forkM doc $ + tcCoreExpr expr `thenM` \ core_expr' -> -- Check for type consistency in the unfolding - tcGetSrcLoc `thenNF_Tc` \ src_loc -> + ifOptM Opt_DoCoreLinting ( + getSrcLocM `thenM` \ src_loc -> case lintUnfolding src_loc in_scope_vars core_expr' of - Nothing -> returnTc core_expr' - Just fail_msg -> failWithTc ((doc <+> text "failed Lint") $$ fail_msg) - where - doc = text "unfolding of" <+> ppr name + Nothing -> returnM () + Just fail_msg -> failWithTc ((doc <+> text "Failed Lint") $$ fail_msg) + ) `thenM_` -tcDelay :: ValueEnv -> SDoc -> TcM s a -> NF_TcM s (Maybe a) -tcDelay unf_env doc thing_inside - = forkNF_Tc ( - recoverNF_Tc bad_value ( - tcSetValueEnv unf_env thing_inside `thenTc` \ r -> - returnTc (Just r) - )) + returnM core_expr' where - -- The trace tells what wasn't available, for the benefit of - -- compiler hackers who want to improve it! - bad_value = getErrsTc `thenNF_Tc` \ (warns,errs) -> - returnNF_Tc (pprTrace "Failed:" - (hang doc 4 (pprBagOfErrors errs)) - Nothing) + doc = text "unfolding of" <+> ppr name \end{code} Variables in unfoldings ~~~~~~~~~~~~~~~~~~~~~~~ -****** Inside here we use only the Global environment, even for locally bound variables. -****** Why? Because we know all the types and want to bind them to real Ids. \begin{code} -tcVar :: Name -> TcM s Id -tcVar name - = tcLookupValueMaybe name `thenNF_Tc` \ maybe_id -> - case maybe_id of { - Just id -> returnTc id; - Nothing -> failWithTc (noDecl name) - } - -noDecl name = hsep [ptext SLIT("Warning: no binding for"), ppr name] +tcVar :: Name -> TcM Id + -- Inside here we use only the Global environment, even for locally bound variables. + -- Why? Because we know all the types and want to bind them to real Ids. +tcVar name = tcLookupGlobalId name \end{code} UfCore expressions. \begin{code} -tcCoreExpr :: UfExpr Name -> TcM s CoreExpr +tcCoreExpr :: UfExpr Name -> TcM CoreExpr tcCoreExpr (UfType ty) - = tcHsTypeKind ty `thenTc` \ (_, ty') -> + = tcIfaceType ty `thenM` \ ty' -> -- It might not be of kind type - returnTc (Type ty') + returnM (Type ty') tcCoreExpr (UfVar name) - = tcVar name `thenTc` \ id -> - returnTc (Var id) + = tcVar name `thenM` \ id -> + returnM (Var id) + +tcCoreExpr (UfLit lit) + = returnM (Lit lit) + +-- The dreaded lit-lits are also similar, except here the type +-- is read in explicitly rather than being implicit +tcCoreExpr (UfLitLit lit ty) + = tcIfaceType ty `thenM` \ ty' -> + returnM (Lit (MachLitLit lit ty')) -tcCoreExpr (UfCon con args) - = tcUfCon con `thenTc` \ con' -> - mapTc tcCoreExpr args `thenTc` \ args' -> - returnTc (Con con' args') +tcCoreExpr (UfFCall cc ty) + = tcIfaceType ty `thenM` \ ty' -> + newUnique `thenM` \ u -> + returnM (Var (mkFCallId u cc ty')) -tcCoreExpr (UfTuple name args) - = tcUfDataCon name `thenTc` \ con -> - mapTc tcCoreExpr args `thenTc` \ args' -> +tcCoreExpr (UfTuple (HsTupCon boxity arity) args) + = mappM tcCoreExpr args `thenM` \ args' -> let -- Put the missing type arguments back in - con_args = map (Type . unUsgTy . coreExprType) args' ++ args' + con_args = map (Type . exprType) args' ++ args' in - returnTc (Con con con_args) + returnM (mkApps (Var con_id) con_args) + where + con_id = dataConWorkId (tupleCon boxity arity) + tcCoreExpr (UfLam bndr body) = tcCoreLamBndr bndr $ \ bndr' -> - tcCoreExpr body `thenTc` \ body' -> - returnTc (Lam bndr' body') + tcCoreExpr body `thenM` \ body' -> + returnM (Lam bndr' body') tcCoreExpr (UfApp fun arg) - = tcCoreExpr fun `thenTc` \ fun' -> - tcCoreExpr arg `thenTc` \ arg' -> - returnTc (App fun' arg') + = tcCoreExpr fun `thenM` \ fun' -> + tcCoreExpr arg `thenM` \ arg' -> + returnM (App fun' arg') tcCoreExpr (UfCase scrut case_bndr alts) - = tcCoreExpr scrut `thenTc` \ scrut' -> + = tcCoreExpr scrut `thenM` \ scrut' -> let - scrut_ty = coreExprType scrut' - case_bndr' = mkVanillaId case_bndr scrut_ty + scrut_ty = exprType scrut' + case_bndr' = mkLocalId case_bndr scrut_ty in tcExtendGlobalValEnv [case_bndr'] $ - mapTc (tcCoreAlt scrut_ty) alts `thenTc` \ alts' -> - returnTc (Case scrut' case_bndr' alts') + mappM (tcCoreAlt scrut_ty) alts `thenM` \ alts' -> + returnM (Case scrut' case_bndr' alts') tcCoreExpr (UfLet (UfNonRec bndr rhs) body) - = tcCoreExpr rhs `thenTc` \ rhs' -> + = tcCoreExpr rhs `thenM` \ rhs' -> tcCoreValBndr bndr $ \ bndr' -> - tcCoreExpr body `thenTc` \ body' -> - returnTc (Let (NonRec bndr' rhs') body') + tcCoreExpr body `thenM` \ body' -> + returnM (Let (NonRec bndr' rhs') body') tcCoreExpr (UfLet (UfRec pairs) body) = tcCoreValBndrs bndrs $ \ bndrs' -> - mapTc tcCoreExpr rhss `thenTc` \ rhss' -> - tcCoreExpr body `thenTc` \ body' -> - returnTc (Let (Rec (bndrs' `zip` rhss')) body') + mappM tcCoreExpr rhss `thenM` \ rhss' -> + tcCoreExpr body `thenM` \ body' -> + returnM (Let (Rec (bndrs' `zip` rhss')) body') where (bndrs, rhss) = unzip pairs tcCoreExpr (UfNote note expr) - = tcCoreExpr expr `thenTc` \ expr' -> + = tcCoreExpr expr `thenM` \ expr' -> case note of - UfCoerce to_ty -> tcHsType to_ty `thenTc` \ to_ty' -> - returnTc (Note (Coerce (unUsgTy to_ty') - (unUsgTy (coreExprType expr'))) expr') - UfInlineCall -> returnTc (Note InlineCall expr') - UfInlineMe -> returnTc (Note InlineMe expr') - UfSCC cc -> returnTc (Note (SCC cc) expr') - -tcCoreNote (UfSCC cc) = returnTc (SCC cc) -tcCoreNote UfInlineCall = returnTc InlineCall - - --- rationalTy isn't built in so, we have to construct it --- (the "ty" part of the incoming literal is simply bottom) -tcUfCon (UfLitCon (NoRepRational lit _)) - = tcLookupTyConByKey rationalTyConKey `thenNF_Tc` \ rational_tycon -> - let - rational_ty = mkSynTy rational_tycon [] - in - returnTc (Literal (NoRepRational lit rational_ty)) - --- Similarly for integers and strings, except that they are wired in -tcUfCon (UfLitCon (NoRepInteger lit _)) - = returnTc (Literal (NoRepInteger lit integerTy)) -tcUfCon (UfLitCon (NoRepStr lit _)) - = returnTc (Literal (NoRepStr lit stringTy)) - -tcUfCon (UfLitCon other_lit) - = returnTc (Literal other_lit) - --- The dreaded lit-lits are also similar, except here the type --- is read in explicitly rather than being implicit -tcUfCon (UfLitLitCon lit ty) - = tcHsType ty `thenTc` \ ty' -> - returnTc (Literal (MachLitLit lit ty')) - -tcUfCon (UfDataCon name) = tcUfDataCon name - -tcUfCon (UfPrimOp name) - = tcVar name `thenTc` \ op_id -> - case isPrimitiveId_maybe op_id of - Just op -> returnTc (PrimOp op) - Nothing -> failWithTc (badPrimOp name) - -tcUfCon (UfCCallOp str is_dyn casm gc) - = case is_dyn of - True -> - tcGetUnique `thenNF_Tc` \ u -> - returnTc (PrimOp (CCallOp (Right u) casm gc cCallConv)) - False -> returnTc (PrimOp (CCallOp (Left str) casm gc cCallConv)) - -tcUfDataCon name - = tcVar name `thenTc` \ con_id -> - case isDataConId_maybe con_id of - Just con -> returnTc (DataCon con) - Nothing -> failWithTc (badCon name) + UfCoerce to_ty -> tcIfaceType to_ty `thenM` \ to_ty' -> + returnM (Note (Coerce to_ty' + (exprType expr')) expr') + UfInlineCall -> returnM (Note InlineCall expr') + UfInlineMe -> returnM (Note InlineMe expr') + UfSCC cc -> returnM (Note (SCC cc) expr') \end{code} \begin{code} tcCoreLamBndr (UfValBinder name ty) thing_inside - = tcHsType ty `thenTc` \ ty' -> + = tcIfaceType ty `thenM` \ ty' -> let - id = mkVanillaId name ty' + id = mkLocalId name ty' in tcExtendGlobalValEnv [id] $ thing_inside id @@ -333,17 +304,17 @@ tcCoreLamBndrs (b:bs) thing_inside thing_inside (b':bs') tcCoreValBndr (UfValBinder name ty) thing_inside - = tcHsType ty `thenTc` \ ty' -> + = tcIfaceType ty `thenM` \ ty' -> let - id = mkVanillaId name ty' + id = mkLocalId name ty' in tcExtendGlobalValEnv [id] $ thing_inside id tcCoreValBndrs bndrs thing_inside -- Expect them all to be ValBinders - = mapTc tcHsType tys `thenTc` \ tys' -> + = mappM tcIfaceType tys `thenM` \ tys' -> let - ids = zipWithEqual "tcCoreValBndr" mkVanillaId names tys' + ids = zipWithEqual "tcCoreValBndr" mkLocalId names tys' in tcExtendGlobalValEnv ids $ thing_inside ids @@ -355,54 +326,95 @@ tcCoreValBndrs bndrs thing_inside -- Expect them all to be ValBinders \begin{code} tcCoreAlt scrut_ty (UfDefault, names, rhs) = ASSERT( null names ) - tcCoreExpr rhs `thenTc` \ rhs' -> - returnTc (DEFAULT, [], rhs') + tcCoreExpr rhs `thenM` \ rhs' -> + returnM (DEFAULT, [], rhs') -tcCoreAlt scrut_ty (UfLitCon lit, names, rhs) +tcCoreAlt scrut_ty (UfLitAlt lit, names, rhs) = ASSERT( null names ) - tcCoreExpr rhs `thenTc` \ rhs' -> - returnTc (Literal lit, [], rhs') + tcCoreExpr rhs `thenM` \ rhs' -> + returnM (LitAlt lit, [], rhs') -tcCoreAlt scrut_ty (UfLitLitCon str ty, names, rhs) +tcCoreAlt scrut_ty (UfLitLitAlt str ty, names, rhs) = ASSERT( null names ) - tcCoreExpr rhs `thenTc` \ rhs' -> - tcHsType ty `thenTc` \ ty' -> - returnTc (Literal (MachLitLit str ty'), [], rhs') + tcCoreExpr rhs `thenM` \ rhs' -> + tcIfaceType ty `thenM` \ ty' -> + returnM (LitAlt (MachLitLit str ty'), [], rhs') -- A case alternative is made quite a bit more complicated -- by the fact that we omit type annotations because we can -- work them out. True enough, but its not that easy! -tcCoreAlt scrut_ty (UfDataCon con_name, names, rhs) - = tcVar con_name `thenTc` \ con_id -> +tcCoreAlt scrut_ty alt@(con, names, rhs) + = tcConAlt con `thenM` \ con -> let - con = case isDataConId_maybe con_id of - Just con -> con - Nothing -> pprPanic "tcCoreAlt" (ppr con_id) - - (main_tyvars, _, ex_tyvars, _, _, _) = dataConSig con - - (tycon, inst_tys, cons) = splitAlgTyConApp scrut_ty - ex_tyvars' = [mkTyVar name (tyVarKind tv) | (name,tv) <- names `zip` ex_tyvars] - ex_tys' = mkTyVarTys ex_tyvars' - arg_tys = dataConArgTys con (inst_tys ++ ex_tys') - id_names = drop (length ex_tyvars) names + ex_tyvars = dataConExistentialTyVars con + (tycon, inst_tys) = splitTyConApp scrut_ty -- NB: not tcSplitTyConApp + -- We are looking at Core here + main_tyvars = tyConTyVars tycon + ex_tyvars' = [mkTyVar name (tyVarKind tv) | (name,tv) <- names `zip` ex_tyvars] + ex_tys' = mkTyVarTys ex_tyvars' + arg_tys = dataConArgTys con (inst_tys ++ ex_tys') + id_names = dropList ex_tyvars names arg_ids #ifdef DEBUG - | length id_names /= length arg_tys - = pprPanic "tcCoreAlts" (ppr (con_name, names, rhs) $$ + | not (equalLength id_names arg_tys) + = pprPanic "tcCoreAlts" (ppr (con, names, rhs) $$ (ppr main_tyvars <+> ppr ex_tyvars) $$ ppr arg_tys) | otherwise #endif - = zipWithEqual "tcCoreAlts" mkVanillaId id_names arg_tys + = zipWithEqual "tcCoreAlts" mkLocalId id_names arg_tys in - ASSERT( con `elem` cons && length inst_tys == length main_tyvars ) + ASSERT( con `elem` tyConDataCons tycon && equalLength inst_tys main_tyvars ) tcExtendTyVarEnv ex_tyvars' $ tcExtendGlobalValEnv arg_ids $ - tcCoreExpr rhs `thenTc` \ rhs' -> - returnTc (DataCon con, ex_tyvars' ++ arg_ids, rhs') + tcCoreExpr rhs `thenM` \ rhs' -> + returnM (DataAlt con, ex_tyvars' ++ arg_ids, rhs') + + +tcConAlt :: UfConAlt Name -> TcM DataCon +tcConAlt (UfTupleAlt (HsTupCon boxity arity)) + = returnM (tupleCon boxity arity) + +tcConAlt (UfDataAlt con_name) -- When reading interface files + -- the con_name will be the real name of + -- the data con + = tcLookupDataCon con_name +\end{code} + +%************************************************************************ +%* * +\subsection{Core decls} +%* * +%************************************************************************ + + +\begin{code} +tcCoreBinds :: [RenamedCoreDecl] -> TcM [TypecheckedCoreBind] +-- We don't assume the bindings are in dependency order +-- So first build the environment, then check the RHSs +tcCoreBinds ls = mappM tcCoreBinder ls `thenM` \ bndrs -> + tcExtendGlobalValEnv bndrs $ + mappM (tcCoreBind bndrs) ls + +tcCoreBinder (CoreDecl nm ty _ _) + = kcHsSigType ty `thenM_` + tcIfaceType ty `thenM` \ ty' -> + returnM (mkLocalId nm ty') + +tcCoreBind bndrs (CoreDecl nm _ rhs loc) + = tcVar nm `thenM` \ id -> + tcCoreExpr rhs `thenM` \ rhs' -> + let + mb_err = lintUnfolding loc bndrs rhs' + in + (case mb_err of + Just err -> addErr err + Nothing -> returnM ()) `thenM_` + + returnM (id, rhs') \end{code} + \begin{code} ifaceSigCtxt sig_name = hsep [ptext SLIT("In an interface-file signature for"), ppr sig_name]