X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypecheck%2FTcIfaceSig.lhs;h=956096d484145213a3da2264a2745187cce736dd;hb=13878c136b4e6b676dbc859f378809676f4d679c;hp=6b8328b5a2d79235160d64e7030218617a0e03ac;hpb=69e14f75a4b031e489b7774914e5a176409cea78;p=ghc-hetmet.git diff --git a/ghc/compiler/typecheck/TcIfaceSig.lhs b/ghc/compiler/typecheck/TcIfaceSig.lhs index 6b8328b..956096d 100644 --- a/ghc/compiler/typecheck/TcIfaceSig.lhs +++ b/ghc/compiler/typecheck/TcIfaceSig.lhs @@ -4,52 +4,46 @@ \section[TcIfaceSig]{Type checking of type signatures in interface files} \begin{code} -module TcIfaceSig ( tcInterfaceSigs, tcVar, tcCoreExpr, tcCoreLamBndrs ) where +module TcIfaceSig ( tcInterfaceSigs, + tcDelay, + tcVar, + tcCoreExpr, + tcCoreLamBndrs, + tcCoreBinds ) where #include "HsVersions.h" -import HsSyn ( HsDecl(..), IfaceSig(..) ) +import HsSyn ( TyClDecl(..), HsTupCon(..) ) 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 TcMonoType ( tcIfaceType ) +import TcEnv ( RecTcEnv, tcExtendTyVarEnv, + tcExtendGlobalValEnv, tcSetEnv, tcEnvIds, + tcLookupGlobal_maybe, tcLookupRecId_maybe ) -import TcEnv ( ValueEnv, tcExtendTyVarEnv, - tcExtendGlobalValEnv, tcSetValueEnv, - tcLookupTyConByKey, tcLookupValueMaybe, - explicitLookupValue, badCon, badPrimOp - ) -import TcType ( TcKind, kindToTcKind ) -import RnHsSyn ( RenamedHsDecl ) +import RnHsSyn ( 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 WwLib ( mkWrapper ) -import PrimOp ( PrimOp(..) ) +import WorkWrap ( mkWrapper ) -import Id ( Id, mkId, mkVanillaId, - isPrimitiveId_maybe, isDataConId_maybe - ) +import Id ( Id, mkVanillaGlobal, mkLocalId, idName, isDataConWrapId_maybe ) +import Module ( Module ) +import MkId ( mkFCallId ) import IdInfo -import DataCon ( dataConSig, dataConArgTys ) -import Type ( mkSynTy, mkTyVarTys, splitAlgTyConApp ) -import Var ( IdOrTyVar, mkTyVar, tyVarKind ) -import VarEnv -import Name ( Name, NamedThing(..) ) -import Unique ( rationalTyConKey ) -import TysWiredIn ( integerTy, stringTy ) -import Demand ( wwLazy ) +import TyCon ( tyConDataCons, tyConTyVars ) +import DataCon ( DataCon, dataConWorkId, dataConExistentialTyVars, dataConArgTys ) +import Type ( Type, mkTyVarTys, splitTyConApp ) +import TysWiredIn ( tupleCon ) +import Var ( mkTyVar, tyVarKind ) +import Name ( Name, nameIsLocalOrFrom ) import ErrUtils ( pprBagOfErrors ) -import Maybes ( maybeToBool, MaybeErr(..) ) import Outputable -import Util ( zipWithEqual ) +import Util ( zipWithEqual, dropList, equalLength ) +import HscTypes ( TyThing(..) ) \end{code} Ultimately, type signatures in interfaces will have pragmatic @@ -60,82 +54,87 @@ 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 :: RecTcEnv -- Envt to use when checking unfoldings + -> Module -- This module + -> [RenamedTyClDecl] -- Ignore non-sig-decls in these decls + -> TcM [Id] -tcInterfaceSigs unf_env (SigD (IfaceSig name ty id_infos src_loc) : rest) - = tcAddSrcLoc src_loc ( - tcAddErrCtxt (ifaceSigCtxt name) ( - tcHsType ty `thenTc` \ sigma_ty -> - tcIdInfo unf_env name sigma_ty vanillaIdInfo id_infos `thenTc` \ id_info -> - returnTc (mkId name sigma_ty id_info) - )) `thenTc` \ sig_id -> - tcInterfaceSigs unf_env rest `thenTc` \ sig_ids -> - returnTc (sig_id : sig_ids) - -tcInterfaceSigs unf_env (other_decl : rest) = tcInterfaceSigs unf_env rest - -tcInterfaceSigs unf_env [] = returnTc [] +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 name ty info info_ins - = foldlTc tcPrag vanillaIdInfo info_ins +tcIdInfo unf_env in_scope_vars name ty info_ins + = foldlTc tcPrag init_info info_ins where - tcPrag info (HsArity arity) = returnTc (info `setArityInfo` arity) - tcPrag info (HsUpdate upd) = returnTc (info `setUpdateInfo` upd) + -- 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 cpr_info) = returnTc (info `setCprInfo` cpr_info) - tcPrag info (HsUnfold inline_prag maybe_expr) - = (case maybe_expr of - Just expr -> tcPragExpr unf_env name [] expr - Nothing -> returnNF_Tc Nothing - ) `thenNF_Tc` \ maybe_expr' -> + tcPrag info (HsArity arity) = + returnTc (info `setArityInfo` 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' -> mkUnfolding expr' + Nothing -> noUnfolding + Just expr' -> mkTopUnfolding expr' info1 = info `setUnfoldingInfo` unfold_info info2 = info1 `setInlinePragInfo` inline_prag in returnTc info2 - tcPrag info (HsStrictness (HsStrictnessInfo (demands,bot_result))) - = returnTc (info `setStrictnessInfo` StrictnessInfo demands bot_result) + tcPrag info (HsStrictness strict_info) + = returnTc (info `setAllStrictnessInfo` Just strict_info) - tcPrag info (HsWorker nm) - = tcWorkerInfo unf_env ty info nm + tcPrag info (HsWorker nm arity) + = tcWorkerInfo unf_env ty info nm arity \end{code} \begin{code} -tcWorkerInfo unf_env ty info worker_name - | arity == 0 - = pprPanic "Worker with no arity info" (ppr worker_name) - - | otherwise - = uniqSMToTcM (mkWrapper ty arity demands cpr_info) `thenNF_Tc` \ wrap_fn -> +tcWorkerInfo unf_env ty info worker_name arity + = uniqSMToTcM (mkWrapper ty strict_sig) `thenNF_Tc` \ wrap_fn -> let -- 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 + 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 + Nothing -> pprTrace "tcWorkerInfo failed:" + (ppr worker_name) info in returnTc info' where - -- We are relying here on arity, cpr and strictness info always appearing + -- We are relying here on strictness info always appearing -- before worker info, fingers crossed .... - arity = arityLowerBound (arityInfo info) - cpr_info = cprInfo info - demands = case strictnessInfo info of - StrictnessInfo d _ -> d - _ -> repeat wwLazy -- Noncommittal + strict_sig = case newStrictnessInfo info of + Just sig -> sig + Nothing -> pprPanic "Worker info but no strictness for" (ppr worker_name) \end{code} For unfoldings we try to do the job lazily, so that we never type check @@ -143,23 +142,23 @@ an unfolding that isn't going to be looked at. \begin{code} tcPragExpr unf_env name in_scope_vars expr - = tcDelay unf_env doc $ + = tcDelay unf_env doc Nothing $ tcCoreExpr expr `thenTc` \ core_expr' -> -- Check for type consistency in the unfolding tcGetSrcLoc `thenNF_Tc` \ src_loc -> - case lintUnfolding src_loc in_scope_vars core_expr' of - Nothing -> returnTc core_expr' - Just fail_msg -> failWithTc ((doc <+> text "failed Lint") $$ fail_msg) + getDOptsTc `thenNF_Tc` \ dflags -> + case lintUnfolding dflags src_loc in_scope_vars core_expr' of + (Nothing,_) -> returnTc (Just core_expr') -- ignore warnings + (Just fail_msg,_) -> failWithTc ((doc <+> text "failed Lint") $$ fail_msg) where doc = text "unfolding of" <+> ppr name -tcDelay :: ValueEnv -> SDoc -> TcM s a -> NF_TcM s (Maybe a) -tcDelay unf_env doc thing_inside +tcDelay :: RecTcEnv -> SDoc -> a -> TcM a -> NF_TcM a +tcDelay unf_env doc bad_ans thing_inside = forkNF_Tc ( recoverNF_Tc bad_value ( - tcSetValueEnv unf_env thing_inside `thenTc` \ r -> - returnTc (Just r) + tcSetEnv unf_env thing_inside )) where -- The trace tells what wasn't available, for the benefit of @@ -167,7 +166,7 @@ tcDelay unf_env doc thing_inside bad_value = getErrsTc `thenNF_Tc` \ (warns,errs) -> returnNF_Tc (pprTrace "Failed:" (hang doc 4 (pprBagOfErrors errs)) - Nothing) + bad_ans) \end{code} @@ -177,12 +176,12 @@ Variables in unfoldings ****** Why? Because we know all the types and want to bind them to real Ids. \begin{code} -tcVar :: Name -> TcM s Id +tcVar :: Name -> TcM Id tcVar name - = tcLookupValueMaybe name `thenNF_Tc` \ maybe_id -> + = tcLookupGlobal_maybe name `thenNF_Tc` \ maybe_id -> case maybe_id of { - Just id -> returnTc id; - Nothing -> failWithTc (noDecl name) + Just (AnId id) -> returnTc id ; + Nothing -> failWithTc (noDecl name) } noDecl name = hsep [ptext SLIT("Warning: no binding for"), ppr name] @@ -191,10 +190,10 @@ noDecl name = hsep [ptext SLIT("Warning: no binding for"), ppr name] UfCore expressions. \begin{code} -tcCoreExpr :: UfExpr Name -> TcM s CoreExpr +tcCoreExpr :: UfExpr Name -> TcM CoreExpr tcCoreExpr (UfType ty) - = tcHsTypeKind ty `thenTc` \ (_, ty') -> + = tcIfaceType ty `thenTc` \ ty' -> -- It might not be of kind type returnTc (Type ty') @@ -202,19 +201,30 @@ tcCoreExpr (UfVar name) = tcVar name `thenTc` \ id -> returnTc (Var id) -tcCoreExpr (UfCon con args) - = tcUfCon con `thenTc` \ con' -> - mapTc tcCoreExpr args `thenTc` \ args' -> - returnTc (Con con' args') +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 (UfFCall cc ty) + = tcIfaceType ty `thenTc` \ ty' -> + tcGetUnique `thenNF_Tc` \ u -> + returnTc (Var (mkFCallId u cc ty')) -tcCoreExpr (UfTuple name args) - = tcUfDataCon name `thenTc` \ con -> - mapTc tcCoreExpr args `thenTc` \ args' -> +tcCoreExpr (UfTuple (HsTupCon _ boxity arity) args) + = mapTc tcCoreExpr args `thenTc` \ args' -> let -- Put the missing type arguments back in - con_args = map (Type . coreExprType) args' ++ args' + con_args = map (Type . exprType) args' ++ args' in - returnTc (Con con con_args) + returnTc (mkApps (Var con_id) con_args) + where + con_id = dataConWorkId (tupleCon boxity arity) + tcCoreExpr (UfLam bndr body) = tcCoreLamBndr bndr $ \ bndr' -> @@ -229,8 +239,8 @@ tcCoreExpr (UfApp fun arg) tcCoreExpr (UfCase scrut case_bndr alts) = tcCoreExpr scrut `thenTc` \ 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' -> @@ -253,67 +263,19 @@ tcCoreExpr (UfLet (UfRec pairs) body) tcCoreExpr (UfNote note expr) = tcCoreExpr expr `thenTc` \ expr' -> case note of - UfCoerce to_ty -> tcHsType to_ty `thenTc` \ to_ty' -> - returnTc (Note (Coerce to_ty' (coreExprType expr')) expr') + 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') - -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) \end{code} \begin{code} tcCoreLamBndr (UfValBinder name ty) thing_inside - = tcHsType ty `thenTc` \ ty' -> + = tcIfaceType ty `thenTc` \ ty' -> let - id = mkVanillaId name ty' + id = mkLocalId name ty' in tcExtendGlobalValEnv [id] $ thing_inside id @@ -331,17 +293,17 @@ tcCoreLamBndrs (b:bs) thing_inside thing_inside (b':bs') tcCoreValBndr (UfValBinder name ty) thing_inside - = tcHsType ty `thenTc` \ ty' -> + = tcIfaceType ty `thenTc` \ 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' -> + = mapTc tcIfaceType tys `thenTc` \ tys' -> let - ids = zipWithEqual "tcCoreValBndr" mkVanillaId names tys' + ids = zipWithEqual "tcCoreValBndr" mkLocalId names tys' in tcExtendGlobalValEnv ids $ thing_inside ids @@ -356,51 +318,81 @@ tcCoreAlt scrut_ty (UfDefault, names, rhs) tcCoreExpr rhs `thenTc` \ rhs' -> returnTc (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') + returnTc (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') + 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 (UfDataCon con_name, names, rhs) - = tcVar con_name `thenTc` \ con_id -> +tcCoreAlt scrut_ty alt@(con, names, rhs) + = tcConAlt con `thenTc` \ 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') + 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} +%************************************************************************ +%* * +\subsection{Core decls} +%* * +%************************************************************************ + + +\begin{code} +tcCoreBinds :: [RenamedTyClDecl] + -> TcM [(Id, Type, CoreExpr)] +tcCoreBinds ls = mapTc tcOne ls + where + tcOne (CoreDecl { tcdName = nm, tcdType = ty, tcdRhs = rhs }) = + tcVar nm `thenTc` \ i -> + tcIfaceType ty `thenTc` \ ty' -> + tcCoreExpr rhs `thenTc` \ rhs' -> + returnTc (i,ty',rhs') + +\end{code} + + + \begin{code} ifaceSigCtxt sig_name = hsep [ptext SLIT("In an interface-file signature for"), ppr sig_name]