X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypecheck%2FTcIfaceSig.lhs;h=b922e6285250de99ac039ab467feac9ed890bd96;hb=b473b6c241cf54b5edc1e21553250739476c0cf9;hp=65e295098f13630c05e1ebdb57843dc65fa96ee1;hpb=f9120c200bcf613b58d742802172fb4c08171f0d;p=ghc-hetmet.git diff --git a/ghc/compiler/typecheck/TcIfaceSig.lhs b/ghc/compiler/typecheck/TcIfaceSig.lhs index 65e2950..b922e62 100644 --- a/ghc/compiler/typecheck/TcIfaceSig.lhs +++ b/ghc/compiler/typecheck/TcIfaceSig.lhs @@ -1,32 +1,44 @@ % -% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996 +% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998 % \section[TcIfaceSig]{Type checking of type signatures in interface files} \begin{code} -#include "HsVersions.h" - -module TcIfaceSig ( tcInterfaceSigs ) where +module TcIfaceSig ( tcInterfaceSigs, tcVar, tcCoreExpr, tcCoreLamBndrs ) where -import Ubiq +#include "HsVersions.h" +import HsSyn ( TyClDecl(..), HsTupCon(..) ) import TcMonad -import TcMonoType ( tcPolyType ) - -import HsSyn ( Sig(..), PolyType ) -import RnHsSyn ( RenamedSig(..), RnName(..) ) - -import CmdLineOpts ( opt_CompilingPrelude ) -import Id ( mkImported ) ---import Name ( Name(..) ) -import Pretty -import Util ( panic ) +import TcMonoType ( tcIfaceType ) +import TcEnv ( RecTcEnv, tcExtendTyVarEnv, + tcExtendGlobalValEnv, tcSetEnv, tcEnvIds, + tcLookupGlobal_maybe, tcLookupRecId_maybe + ) +import RnHsSyn ( RenamedTyClDecl ) +import HsCore +import Literal ( Literal(..) ) +import CoreSyn +import CoreUtils ( exprType ) +import CoreUnfold +import CoreLint ( lintUnfolding ) +import WorkWrap ( mkWrapper ) ---import TcPragmas ( tcGenPragmas ) -import IdInfo ( noIdInfo ) -tcGenPragmas ty id ps = returnNF_Tc noIdInfo - +import Id ( Id, mkVanillaGlobal, mkLocalId, idName, isDataConWrapId_maybe ) +import Module ( Module ) +import MkId ( mkCCallOpId ) +import IdInfo +import DataCon ( DataCon, dataConId, dataConSig, dataConArgTys ) +import Type ( mkTyVarTys, splitAlgTyConApp_maybe ) +import TysWiredIn ( tupleCon ) +import Var ( mkTyVar, tyVarKind ) +import Name ( Name, nameIsLocalOrFrom ) +import Demand ( wwLazy ) +import ErrUtils ( pprBagOfErrors ) +import Outputable +import Util ( zipWithEqual ) +import HscTypes ( TyThing(..) ) \end{code} Ultimately, type signatures in interfaces will have pragmatic @@ -37,30 +49,333 @@ As always, we do not have to worry about user-pragmas in interface signatures. \begin{code} -tcInterfaceSigs :: [RenamedSig] -> TcM s [Id] - -tcInterfaceSigs [] = returnTc [] - -tcInterfaceSigs (Sig name@(RnName full_name) ty pragmas src_loc : sigs) - = tcAddSrcLoc src_loc ( - tcPolyType ty `thenTc` \ sigma_ty -> - fixTc ( \ rec_id -> - tcGenPragmas (Just sigma_ty) rec_id pragmas - `thenNF_Tc` \ id_info -> - returnTc (mkImported full_name sigma_ty id_info) - )) `thenTc` \ id -> - tcInterfaceSigs sigs `thenTc` \ sigs' -> - returnTc (id:sigs') - - -tcInterfaceSigs (Sig odd_name _ _ src_loc : sigs) - = case odd_name of - WiredInId _ | opt_CompilingPrelude - -> tcInterfaceSigs sigs - _ -> tcAddSrcLoc src_loc $ - failTc (ifaceSigNameErr odd_name) - -ifaceSigNameErr name sty - = ppHang (ppStr "Bad name in an interface type signature (a Prelude name?)") - 4 (ppr sty name) +tcInterfaceSigs :: RecTcEnv -- Envt to use when checking unfoldings + -> Module -- This module + -> [RenamedTyClDecl] -- Ignore non-sig-decls in these decls + -> TcM [Id] + + +tcInterfaceSigs unf_env mod decls + = listTc [ do_one name ty id_infos src_loc + | IfaceSig {tcdName = name, tcdType = ty, tcdIdInfo = id_infos, tcdLoc =src_loc} <- decls] + where + in_scope_vars = filter (nameIsLocalOrFrom mod . idName) (tcEnvIds unf_env) + -- Oops: using isLocalId instead can give a black hole + -- because it looks at the idinfo + + -- 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 name ty id_infos src_loc + = tcAddSrcLoc src_loc $ + tcAddErrCtxt (ifaceSigCtxt name) $ + tcIfaceType ty `thenTc` \ sigma_ty -> + tcIdInfo unf_env in_scope_vars name + sigma_ty id_infos `thenTc` \ id_info -> + returnTc (mkVanillaGlobal name sigma_ty id_info) +\end{code} + +\begin{code} +tcIdInfo unf_env in_scope_vars name ty info_ins + = foldlTc tcPrag init_info info_ins + where + -- set the CgInfo to something sensible but uninformative before + -- we start, because the default CgInfo is a panic. + init_info = vanillaIdInfo `setCgInfo` vanillaCgInfo + + tcPrag info (HsNoCafRefs) = returnTc (info `setCafInfo` NoCafRefs) + tcPrag info HsCprInfo = returnTc (info `setCprInfo` ReturnsCPR) + + tcPrag info (HsArity arity) = + returnTc (info `setArityInfo` (ArityExactly arity) + `setCgArity` arity) + + tcPrag info (HsUnfold inline_prag expr) + = tcPragExpr unf_env name in_scope_vars expr `thenNF_Tc` \ maybe_expr' -> + let + -- 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' -> mkTopUnfolding expr' + info1 = info `setUnfoldingInfo` unfold_info + info2 = info1 `setInlinePragInfo` inline_prag + in + returnTc info2 + + tcPrag info (HsStrictness strict_info) + = returnTc (info `setStrictnessInfo` strict_info) + + tcPrag info (HsWorker nm arity) + = tcWorkerInfo unf_env ty info nm arity +\end{code} + +\begin{code} +tcWorkerInfo unf_env ty info worker_name arity + = uniqSMToTcM (mkWrapper ty arity demands res_bot cpr_info) `thenNF_Tc` \ wrap_fn -> + let + -- Watch out! We can't pull on unf_env too eagerly! + info' = case tcLookupRecId_maybe unf_env worker_name of + Just worker_id -> + info `setUnfoldingInfo` mkTopUnfolding (wrap_fn worker_id) + `setWorkerInfo` HasWorker worker_id arity + + Nothing -> pprTrace "tcWorkerInfo failed:" + (ppr worker_name) info + in + returnTc info' + where + -- We are relying here on cpr and strictness info always appearing + -- before worker info, fingers crossed .... + cpr_info = cprInfo info + + (demands, res_bot) + = case strictnessInfo info of + StrictnessInfo d r -> (d,r) + _ -> (take arity (repeat wwLazy),False) + -- Noncommittal +\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' -> + + -- Check for type consistency in the unfolding + tcGetSrcLoc `thenNF_Tc` \ src_loc -> + getDOptsTc `thenTc` \ dflags -> + case lintUnfolding dflags src_loc in_scope_vars core_expr' of + (Nothing,_) -> returnTc core_expr' -- ignore warnings + (Just fail_msg,_) -> failWithTc ((doc <+> text "failed Lint") $$ fail_msg) + where + doc = text "unfolding of" <+> ppr name + +tcDelay :: RecTcEnv -> SDoc -> TcM a -> NF_TcM (Maybe a) +tcDelay unf_env doc thing_inside + = forkNF_Tc ( + recoverNF_Tc bad_value ( + tcSetEnv unf_env thing_inside `thenTc` \ r -> + returnTc (Just r) + )) + 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) +\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 Id +tcVar name + = tcLookupGlobal_maybe name `thenNF_Tc` \ maybe_id -> + case maybe_id of { + Just (AnId id) -> returnTc id ; + Nothing -> failWithTc (noDecl name) + } + +noDecl name = hsep [ptext SLIT("Warning: no binding for"), ppr name] +\end{code} + +UfCore expressions. + +\begin{code} +tcCoreExpr :: UfExpr Name -> TcM CoreExpr + +tcCoreExpr (UfType ty) + = tcIfaceType ty `thenTc` \ ty' -> + -- It might not be of kind type + returnTc (Type ty') + +tcCoreExpr (UfVar name) + = tcVar name `thenTc` \ id -> + returnTc (Var id) + +tcCoreExpr (UfLit lit) + = returnTc (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 `thenTc` \ ty' -> + returnTc (Lit (MachLitLit lit ty')) + +tcCoreExpr (UfCCall cc ty) + = tcIfaceType ty `thenTc` \ ty' -> + tcGetUnique `thenNF_Tc` \ u -> + returnTc (Var (mkCCallOpId u cc ty')) + +tcCoreExpr (UfTuple (HsTupCon _ boxity arity) args) + = mapTc tcCoreExpr args `thenTc` \ args' -> + let + -- Put the missing type arguments back in + con_args = map (Type . exprType) args' ++ args' + in + returnTc (mkApps (Var con_id) con_args) + where + con_id = dataConId (tupleCon boxity arity) + + +tcCoreExpr (UfLam bndr body) + = tcCoreLamBndr bndr $ \ bndr' -> + tcCoreExpr body `thenTc` \ body' -> + returnTc (Lam bndr' body') + +tcCoreExpr (UfApp fun arg) + = tcCoreExpr fun `thenTc` \ fun' -> + tcCoreExpr arg `thenTc` \ arg' -> + returnTc (App fun' arg') + +tcCoreExpr (UfCase scrut case_bndr alts) + = tcCoreExpr scrut `thenTc` \ scrut' -> + let + 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') + +tcCoreExpr (UfLet (UfNonRec bndr rhs) body) + = tcCoreExpr rhs `thenTc` \ rhs' -> + tcCoreValBndr bndr $ \ bndr' -> + tcCoreExpr body `thenTc` \ body' -> + returnTc (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') + where + (bndrs, rhss) = unzip pairs + +tcCoreExpr (UfNote note expr) + = tcCoreExpr expr `thenTc` \ expr' -> + case note of + UfCoerce to_ty -> tcIfaceType to_ty `thenTc` \ to_ty' -> + returnTc (Note (Coerce to_ty' + (exprType expr')) expr') + UfInlineCall -> returnTc (Note InlineCall expr') + UfInlineMe -> returnTc (Note InlineMe expr') + UfSCC cc -> returnTc (Note (SCC cc) expr') \end{code} + +\begin{code} +tcCoreLamBndr (UfValBinder name ty) thing_inside + = tcIfaceType ty `thenTc` \ ty' -> + let + id = mkLocalId name ty' + in + tcExtendGlobalValEnv [id] $ + thing_inside id + +tcCoreLamBndr (UfTyBinder name kind) thing_inside + = let + tyvar = mkTyVar name kind + in + tcExtendTyVarEnv [tyvar] (thing_inside tyvar) + +tcCoreLamBndrs [] thing_inside = thing_inside [] +tcCoreLamBndrs (b:bs) thing_inside + = tcCoreLamBndr b $ \ b' -> + tcCoreLamBndrs bs $ \ bs' -> + thing_inside (b':bs') + +tcCoreValBndr (UfValBinder name ty) thing_inside + = tcIfaceType ty `thenTc` \ ty' -> + let + id = mkLocalId name ty' + in + tcExtendGlobalValEnv [id] $ + thing_inside id + +tcCoreValBndrs bndrs thing_inside -- Expect them all to be ValBinders + = mapTc tcIfaceType tys `thenTc` \ tys' -> + let + ids = zipWithEqual "tcCoreValBndr" mkLocalId names tys' + in + tcExtendGlobalValEnv ids $ + thing_inside ids + where + names = [name | UfValBinder name _ <- bndrs] + tys = [ty | UfValBinder _ ty <- bndrs] +\end{code} + +\begin{code} +tcCoreAlt scrut_ty (UfDefault, names, rhs) + = ASSERT( null names ) + tcCoreExpr rhs `thenTc` \ rhs' -> + returnTc (DEFAULT, [], rhs') + +tcCoreAlt scrut_ty (UfLitAlt lit, names, rhs) + = ASSERT( null names ) + tcCoreExpr rhs `thenTc` \ rhs' -> + returnTc (LitAlt lit, [], rhs') + +tcCoreAlt scrut_ty (UfLitLitAlt str ty, names, rhs) + = ASSERT( null names ) + tcCoreExpr rhs `thenTc` \ rhs' -> + tcIfaceType ty `thenTc` \ ty' -> + returnTc (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 alt@(con, names, rhs) + = tcConAlt con `thenTc` \ con -> + let + (main_tyvars, _, ex_tyvars, _, _, _) = dataConSig con + + (_, inst_tys, cons) = case splitAlgTyConApp_maybe scrut_ty of + Just stuff -> stuff + Nothing -> pprPanic "tcCoreAlt" (ppr alt) + 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 + arg_ids +#ifdef DEBUG + | length id_names /= length arg_tys + = pprPanic "tcCoreAlts" (ppr (con, names, rhs) $$ + (ppr main_tyvars <+> ppr ex_tyvars) $$ + ppr arg_tys) + | otherwise +#endif + = zipWithEqual "tcCoreAlts" mkLocalId id_names arg_tys + in + ASSERT( con `elem` cons && length inst_tys == length main_tyvars ) + tcExtendTyVarEnv ex_tyvars' $ + tcExtendGlobalValEnv arg_ids $ + tcCoreExpr rhs `thenTc` \ rhs' -> + returnTc (DataAlt con, ex_tyvars' ++ arg_ids, rhs') + + +tcConAlt :: UfConAlt Name -> TcM DataCon +tcConAlt (UfTupleAlt (HsTupCon _ boxity arity)) + = returnTc (tupleCon boxity arity) + +tcConAlt (UfDataAlt con_name) + = tcVar con_name `thenTc` \ con_id -> + returnTc (case isDataConWrapId_maybe con_id of + Just con -> con + Nothing -> pprPanic "tcCoreAlt" (ppr con_id)) +\end{code} + +\begin{code} +ifaceSigCtxt sig_name + = hsep [ptext SLIT("In an interface-file signature for"), ppr sig_name] +\end{code} +