\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(..), HsTupCon(..) )
+import HsSyn ( TyClDecl(..), HsTupCon(..) )
+import TcHsSyn ( TypecheckedCoreBind )
import TcMonad
-import TcMonoType ( tcHsType )
- -- NB: all the tyars in interface files are kinded,
- -- so tcHsType will do the Right Thing without
- -- having to mess about with zonking
-
-import TcEnv ( ValueEnv, tcExtendTyVarEnv,
- tcExtendGlobalValEnv, tcSetValueEnv,
- tcLookupValueMaybe,
- explicitLookupValue, valueEnvIds
+import TcMonoType ( tcIfaceType )
+import TcEnv ( RecTcEnv, tcExtendTyVarEnv,
+ tcExtendGlobalValEnv, tcSetEnv, tcEnvIds,
+ tcLookupGlobal_maybe, tcLookupRecId_maybe
)
-import RnHsSyn ( RenamedHsDecl )
+import RnHsSyn ( RenamedTyClDecl )
import HsCore
import Literal ( Literal(..) )
import CoreSyn
import CoreLint ( lintUnfolding )
import WorkWrap ( mkWrapper )
-import Id ( Id, mkId, mkVanillaId,
- isDataConWrapId_maybe
- )
-import MkId ( mkCCallOpId )
+import Id ( Id, mkVanillaGlobal, mkLocalId, idName, isDataConWrapId_maybe )
+import Module ( Module )
+import MkId ( mkFCallId )
import IdInfo
-import DataCon ( dataConSig, dataConArgTys )
-import Type ( mkTyVarTys, splitAlgTyConApp_maybe, unUsgTy )
+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, isLocallyDefined )
-import Demand ( wwLazy )
+import Name ( Name, nameIsLocalOrFrom )
import ErrUtils ( pprBagOfErrors )
import Outputable
-import Util ( zipWithEqual )
+import Util ( zipWithEqual, dropList, equalLength )
+import HscTypes ( TyThing(..) )
\end{code}
Ultimately, type signatures in interfaces will have pragmatic
signatures.
\begin{code}
-tcInterfaceSigs :: ValueEnv -- Envt to use when checking unfoldings
- -> [RenamedHsDecl] -- Ignore non-sig-decls in these decls
+tcInterfaceSigs :: RecTcEnv -- Envt to use when checking unfoldings
+ -> Module -- This module
+ -> [RenamedTyClDecl] -- Ignore non-sig-decls in these decls
-> TcM [Id]
-tcInterfaceSigs unf_env decls
+tcInterfaceSigs unf_env mod decls
= listTc [ do_one name ty id_infos src_loc
- | SigD (IfaceSig name ty id_infos src_loc) <- decls]
+ | IfaceSig {tcdName = name, tcdType = ty, tcdIdInfo = id_infos, tcdLoc =src_loc} <- decls]
where
- in_scope_vars = filter isLocallyDefined (valueEnvIds unf_env)
+ 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) $
- tcHsType ty `thenTc` \ sigma_ty ->
+ tcIfaceType ty `thenTc` \ 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 `thenTc` \ id_info ->
+ returnTc (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
+ = foldlTc tcPrag init_info info_ins
where
- tcPrag info (HsArity arity) = returnTc (info `setArityInfo` arity)
+ -- Set the CgInfo to something sensible but uninformative before
+ -- we start; default assumption is that it has CAFs
+ init_info = hasCafIdInfo
+
tcPrag info (HsNoCafRefs) = returnTc (info `setCafInfo` NoCafRefs)
- tcPrag info HsCprInfo = returnTc (info `setCprInfo` ReturnsCPR)
+
+ 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' ->
returnTc info2
tcPrag info (HsStrictness strict_info)
- = returnTc (info `setStrictnessInfo` 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
- | not (hasArity arity_info)
- = pprPanic "Worker with no arity info" (ppr worker_name)
-
- | otherwise
- = uniqSMToTcM (mkWrapper ty arity demands res_bot 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` mkTopUnfolding (wrap_fn worker_id)
- `setWorkerInfo` HasWorker worker_id arity
+ 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_info = arityInfo info
- arity = arityLowerBound arity_info
- cpr_info = cprInfo info
- (demands, res_bot) = case strictnessInfo info of
- StrictnessInfo d r -> (d,r)
- _ -> (take arity (repeat wwLazy),False) -- 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
\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' -- ignore warnings
+ 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 a -> NF_TcM (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
bad_value = getErrsTc `thenNF_Tc` \ (warns,errs) ->
returnNF_Tc (pprTrace "Failed:"
(hang doc 4 (pprBagOfErrors errs))
- Nothing)
+ bad_ans)
\end{code}
\begin{code}
tcVar :: Name -> TcM Id
tcVar name
- = tcLookupGlobalMaybe name `thenNF_Tc` \ maybe_id ->
+ = tcLookupGlobal_maybe name `thenNF_Tc` \ maybe_id ->
case maybe_id of {
- Just (AnId id) -> returnTc id;
+ Just (AnId id) -> returnTc id ;
Nothing -> failWithTc (noDecl name)
}
tcCoreExpr :: UfExpr Name -> TcM CoreExpr
tcCoreExpr (UfType ty)
- = tcHsType ty `thenTc` \ ty' ->
+ = tcIfaceType ty `thenTc` \ ty' ->
-- It might not be of kind type
returnTc (Type ty')
-- The dreaded lit-lits are also similar, except here the type
-- is read in explicitly rather than being implicit
tcCoreExpr (UfLitLit lit ty)
- = tcHsType ty `thenTc` \ ty' ->
+ = tcIfaceType ty `thenTc` \ ty' ->
returnTc (Lit (MachLitLit lit ty'))
-tcCoreExpr (UfCCall cc ty)
- = tcHsType ty `thenTc` \ ty' ->
+tcCoreExpr (UfFCall cc ty)
+ = tcIfaceType ty `thenTc` \ ty' ->
tcGetUnique `thenNF_Tc` \ u ->
- returnTc (Var (mkCCallOpId u cc ty'))
+ returnTc (Var (mkFCallId u cc ty'))
-tcCoreExpr (UfTuple (HsTupCon name _) args)
- = tcVar name `thenTc` \ con_id ->
- 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 . unUsgTy . exprType) args' ++ args'
+ con_args = map (Type . exprType) args' ++ args'
in
returnTc (mkApps (Var con_id) con_args)
+ where
+ con_id = dataConWorkId (tupleCon boxity arity)
+
tcCoreExpr (UfLam bndr body)
= tcCoreLamBndr bndr $ \ bndr' ->
= tcCoreExpr scrut `thenTc` \ scrut' ->
let
scrut_ty = exprType scrut'
- case_bndr' = mkVanillaId case_bndr scrut_ty
+ case_bndr' = mkLocalId case_bndr scrut_ty
in
tcExtendGlobalValEnv [case_bndr'] $
mapTc (tcCoreAlt scrut_ty) alts `thenTc` \ alts' ->
tcCoreExpr (UfNote note expr)
= tcCoreExpr expr `thenTc` \ expr' ->
case note of
- UfCoerce to_ty -> tcHsType to_ty `thenTc` \ to_ty' ->
- returnTc (Note (Coerce (unUsgTy to_ty')
- (unUsgTy (exprType 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
\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
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
tcCoreAlt scrut_ty (UfLitLitAlt str ty, names, rhs)
= ASSERT( null names )
tcCoreExpr rhs `thenTc` \ rhs' ->
- tcHsType ty `thenTc` \ ty' ->
+ 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@(UfDataAlt con_name, names, rhs)
- = tcVar con_name `thenTc` \ con_id ->
+tcCoreAlt scrut_ty alt@(con, names, rhs)
+ = tcConAlt con `thenTc` \ con ->
let
- con = case isDataConWrapId_maybe con_id of
- Just con -> con
- Nothing -> pprPanic "tcCoreAlt" (ppr con_id)
-
- (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
+ 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 (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 [TypecheckedCoreBind]
+-- We don't assume the bindings are in dependency order
+-- So first build the environment, then check the RHSs
+tcCoreBinds ls = mapTc tcCoreBinder ls `thenTc` \ bndrs ->
+ tcExtendGlobalValEnv bndrs $
+ mapTc tcCoreBind ls
+
+tcCoreBinder (CoreDecl { tcdName = nm, tcdType = ty })
+ = tcIfaceType ty `thenTc` \ ty' ->
+ returnTc (mkLocalId nm ty')
+
+tcCoreBind (CoreDecl { tcdName = nm, tcdRhs = rhs })
+ = tcVar nm `thenTc` \ id ->
+ tcCoreExpr rhs `thenTc` \ rhs' ->
+ returnTc (id, rhs')
\end{code}
+
\begin{code}
ifaceSigCtxt sig_name
= hsep [ptext SLIT("In an interface-file signature for"), ppr sig_name]
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