%
-% (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}
import HsSyn ( HsDecl(..), IfaceSig(..) )
import TcMonad
-import TcMonoType ( tcHsType, tcHsTypeKind, tcTyVarScope )
-import TcEnv ( tcExtendTyVarEnv, tcExtendGlobalValEnv, tcSetGlobalValEnv,
- tcLookupTyConByKey, tcLookupGlobalValueMaybe,
- tcExplicitLookupGlobal,
- GlobalValueEnv
+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 TcKind ( TcKind, kindToTcKind )
+import TcEnv ( ValueEnv, tcExtendTyVarEnv,
+ tcExtendGlobalValEnv, tcSetValueEnv,
+ tcLookupTyConByKey, tcLookupValueMaybe,
+ explicitLookupValue, badCon, badPrimOp
+ )
+import TcType ( TcKind, kindToTcKind )
import RnHsSyn ( RenamedHsDecl )
import HsCore
import HsDecls ( HsIdInfo(..), HsStrictnessInfo(..) )
-import Literal ( Literal(..) )
+import CallConv ( cCallConv )
+import Const ( Con(..), Literal(..) )
import CoreSyn
import CoreUtils ( coreExprType )
import CoreUnfold
-import MagicUFs ( MagicUnfoldingFun )
import WwLib ( mkWrapper )
import PrimOp ( PrimOp(..) )
-import CallConv ( cCallConv )
-import MkId ( mkImportedId, mkUserId )
-import Id ( Id, addInlinePragma, isPrimitiveId_maybe, dataConArgTys )
+import Id ( Id, mkImportedId, mkUserId,
+ isPrimitiveId_maybe, isDataConId_maybe
+ )
import IdInfo
+import DataCon ( dataConSig, dataConArgTys )
import SpecEnv ( addToSpecEnv )
-import Type ( mkSynTy, splitAlgTyConApp )
-import TyVar ( mkSysTyVar )
-import Name ( Name )
-import Unique ( rationalTyConKey, uniqueOf )
-import TysWiredIn ( integerTy )
+import Type ( mkSynTy, mkTyVarTys, splitAlgTyConApp )
+import Var ( mkTyVar, tyVarKind )
+import VarEnv
+import Name ( Name, NamedThing(..) )
+import Unique ( rationalTyConKey )
+import TysWiredIn ( integerTy, stringTy )
import ErrUtils ( pprBagOfErrors )
import Maybes ( maybeToBool, MaybeErr(..) )
import Outputable
import Util ( zipWithEqual )
-
\end{code}
Ultimately, type signatures in interfaces will have pragmatic
signatures.
\begin{code}
-tcInterfaceSigs :: GlobalValueEnv -- Envt to use when checking unfoldings
+tcInterfaceSigs :: ValueEnv -- Envt to use when checking unfoldings
-> [RenamedHsDecl] -- Ignore non-sig-decls in these decls
-> TcM s [Id]
where
tcPrag info (HsArity arity) = returnTc (arity `setArityInfo` info)
tcPrag info (HsUpdate upd) = returnTc (upd `setUpdateInfo` info)
- tcPrag info (HsFBType fb) = returnTc (fb `setFBTypeInfo` info)
- tcPrag info (HsArgUsage au) = returnTc (au `setArgUsageInfo` info)
+ tcPrag info (HsNoCafRefs) = returnTc (NoCafRefs `setCafInfo` info)
- tcPrag info (HsUnfold inline expr)
- = tcPragExpr unf_env name expr `thenNF_Tc` \ maybe_expr' ->
+ 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' ->
let
-- maybe_expr doesn't get looked at if the unfolding
-- is never inspected; so the typecheck doesn't even happen
Just expr' -> mkUnfolding expr'
info1 = unfold_info `setUnfoldingInfo` info
- info2 | inline = IWantToBeINLINEd `setInlinePragInfo` info1
- | otherwise = info1
+ info2 = inline_prag `setInlinePragInfo` info1
in
returnTc info2
= tcStrictness unf_env ty info strict
tcPrag info (HsSpecialise tyvars tys rhs)
- = tcTyVarScope tyvars $ \ tyvars' ->
+ = tcExtendTyVarScope tyvars $ \ tyvars' ->
mapAndUnzipTc tcHsTypeKind tys `thenTc` \ (kinds, tys') ->
-- Assume that the kinds match the kinds of the
-- type variables of the function; this is, after all, an
\end{code}
\begin{code}
-tcStrictness unf_env ty info (HsStrictnessInfo demands maybe_worker)
+tcStrictness unf_env ty info (HsStrictnessInfo (demands, bot_result) maybe_worker)
= tcWorker unf_env maybe_worker `thenNF_Tc` \ maybe_worker_id ->
uniqSMToTcM (mkWrapper ty demands) `thenNF_Tc` \ wrap_fn ->
let
has_worker = maybeToBool maybe_worker_id
in
- returnTc (StrictnessInfo demands has_worker `setStrictnessInfo` info')
-
--- Boring to write these out, but the result type differs from the arg type...
-tcStrictness unf_env ty info HsBottom
- = returnTc (BottomGuaranteed `setStrictnessInfo` info)
+ returnTc (StrictnessInfo demands bot_result has_worker `setStrictnessInfo` info')
\end{code}
\begin{code}
tcWorker unf_env (Just (worker_name,_))
= returnNF_Tc (trace_maybe maybe_worker_id)
where
- maybe_worker_id = tcExplicitLookupGlobal unf_env worker_name
+ maybe_worker_id = explicitLookupValue unf_env worker_name
-- The trace is so we can see what's getting dropped
trace_maybe Nothing = pprTrace "tcWorker failed:" (ppr worker_name) Nothing
an unfolding that isn't going to be looked at.
\begin{code}
+tcPragExpr :: ValueEnv -> Name -> UfExpr Name -> NF_TcM s (Maybe CoreExpr)
tcPragExpr unf_env name core_expr
= forkNF_Tc (
recoverNF_Tc no_unfolding (
- tcSetGlobalValEnv unf_env $
+ tcSetValueEnv unf_env $
tcCoreExpr core_expr `thenTc` \ core_expr' ->
returnTc (Just core_expr')
))
\begin{code}
tcVar :: Name -> TcM s Id
tcVar name
- = tcLookupGlobalValueMaybe name `thenNF_Tc` \ maybe_id ->
+ = tcLookupValueMaybe name `thenNF_Tc` \ maybe_id ->
case maybe_id of {
Just id -> returnTc id;
Nothing -> failWithTc (noDecl name)
\begin{code}
tcCoreExpr :: UfExpr Name -> TcM s CoreExpr
+tcCoreExpr (UfType ty)
+ = tcHsTypeKind ty `thenTc` \ (_, ty') ->
+ -- It might not be of kind type
+ returnTc (Type ty')
+
tcCoreExpr (UfVar name)
= tcVar name `thenTc` \ id ->
returnTc (Var id)
--- rationalTy isn't built in so we have to construct it
--- (the "ty" part of the incoming literal is simply bottom)
-tcCoreExpr (UfLit (NoRepRational lit _))
- = tcLookupTyConByKey rationalTyConKey `thenNF_Tc` \ rational_tycon ->
- let
- rational_ty = mkSynTy rational_tycon []
- in
- returnTc (Lit (NoRepRational lit rational_ty))
-
--- Similarly for integers, except that it is wired in
-tcCoreExpr (UfLit (NoRepInteger lit _))
- = returnTc (Lit (NoRepInteger lit integerTy))
-
-tcCoreExpr (UfLit other_lit)
- = returnTc (Lit other_lit)
-
tcCoreExpr (UfCon con args)
- = tcVar con `thenTc` \ con_id ->
- mapTc tcCoreArg args `thenTc` \ args' ->
- returnTc (Con con_id args')
+ = tcUfCon con `thenTc` \ con' ->
+ mapTc tcCoreExpr args `thenTc` \ args' ->
+ returnTc (Con con' args')
-tcCoreExpr (UfPrim prim args)
- = tcCorePrim prim `thenTc` \ primop ->
- mapTc tcCoreArg args `thenTc` \ args' ->
- returnTc (Prim primop args')
+tcCoreExpr (UfTuple name args)
+ = tcUfDataCon name `thenTc` \ con ->
+ mapTc tcCoreExpr args `thenTc` \ args' ->
+ let
+ -- Put the missing type arguments back in
+ con_args = map (Type . coreExprType) args' ++ args'
+ in
+ returnTc (Con con con_args)
tcCoreExpr (UfLam bndr body)
= tcCoreLamBndr bndr $ \ bndr' ->
tcCoreExpr (UfApp fun arg)
= tcCoreExpr fun `thenTc` \ fun' ->
- tcCoreArg arg `thenTc` \ arg' ->
+ tcCoreExpr arg `thenTc` \ arg' ->
returnTc (App fun' arg')
-tcCoreExpr (UfCase scrut alts)
- = tcCoreExpr scrut `thenTc` \ scrut' ->
- tcCoreAlts (coreExprType scrut') alts `thenTc` \ alts' ->
- returnTc (Case scrut' alts')
+tcCoreExpr (UfCase scrut case_bndr alts)
+ = tcCoreExpr scrut `thenTc` \ scrut' ->
+ let
+ scrut_ty = coreExprType scrut'
+ case_bndr' = mkUserId 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' ->
tcCoreExpr (UfNote note expr)
= tcCoreExpr expr `thenTc` \ expr' ->
case note of
- UfCoerce to_ty -> tcHsTypeKind to_ty `thenTc` \ (_,to_ty') ->
+ UfCoerce to_ty -> tcHsType to_ty `thenTc` \ to_ty' ->
returnTc (Note (Coerce to_ty' (coreExprType expr')) expr')
UfInlineCall -> returnTc (Note InlineCall 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}
id = mkUserId name ty'
in
tcExtendGlobalValEnv [id] $
- thing_inside (ValBinder id)
+ thing_inside id
tcCoreLamBndr (UfTyBinder name kind) thing_inside
= let
- tyvar = mkSysTyVar (uniqueOf name) kind
+ tyvar = mkTyVar name kind
in
- tcExtendTyVarEnv [name] [(kindToTcKind kind, tyvar)] $
- thing_inside (TyBinder tyvar)
+ tcExtendTyVarEnv [tyvar] (thing_inside tyvar)
tcCoreValBndr (UfValBinder name ty) thing_inside
= tcHsType ty `thenTc` \ ty' ->
tcExtendGlobalValEnv ids $
thing_inside ids
where
- names = map (\ (UfValBinder name _) -> name) bndrs
- tys = map (\ (UfValBinder _ ty) -> ty) bndrs
+ names = [name | UfValBinder name _ <- bndrs]
+ tys = [ty | UfValBinder _ ty <- bndrs]
\end{code}
\begin{code}
-tcCoreArg (UfVarArg v) = tcVar v `thenTc` \ v' -> returnTc (VarArg v')
-tcCoreArg (UfTyArg ty) = tcHsTypeKind ty `thenTc` \ (_,ty') -> returnTc (TyArg ty')
-tcCoreArg (UfLitArg lit) = returnTc (LitArg lit)
-
-tcCoreAlts scrut_ty (UfAlgAlts alts deflt)
- = mapTc tc_alt alts `thenTc` \ alts' ->
- tcCoreDefault scrut_ty deflt `thenTc` \ deflt' ->
- returnTc (AlgAlts alts' deflt')
- where
- tc_alt (con, names, rhs)
- = tcVar con `thenTc` \ con' ->
- let
- arg_tys = dataConArgTys con' inst_tys
- (tycon, inst_tys, cons) = splitAlgTyConApp scrut_ty
- arg_ids = zipWithEqual "tcCoreAlts" mkUserId names arg_tys
- in
- tcExtendGlobalValEnv arg_ids $
- tcCoreExpr rhs `thenTc` \ rhs' ->
- returnTc (con', arg_ids, rhs')
-
-tcCoreAlts scrut_ty (UfPrimAlts alts deflt)
- = mapTc tc_alt alts `thenTc` \ alts' ->
- tcCoreDefault scrut_ty deflt `thenTc` \ deflt' ->
- returnTc (PrimAlts alts' deflt')
- where
- tc_alt (lit, rhs) = tcCoreExpr rhs `thenTc` \ rhs' ->
- returnTc (lit, rhs')
-
-tcCoreDefault scrut_ty UfNoDefault = returnTc NoDefault
-tcCoreDefault scrut_ty (UfBindDefault name rhs)
- = let
- deflt_id = mkUserId name scrut_ty
+tcCoreAlt scrut_ty (UfDefault, names, rhs)
+ = ASSERT( null names )
+ tcCoreExpr rhs `thenTc` \ rhs' ->
+ returnTc (DEFAULT, [], rhs')
+
+tcCoreAlt scrut_ty (UfLitCon lit, names, rhs)
+ = ASSERT( null names )
+ tcCoreExpr rhs `thenTc` \ rhs' ->
+ returnTc (Literal lit, [], rhs')
+
+tcCoreAlt scrut_ty (UfLitLitCon str ty, names, rhs)
+ = ASSERT( null names )
+ tcCoreExpr rhs `thenTc` \ rhs' ->
+ tcHsType ty `thenTc` \ ty' ->
+ returnTc (Literal (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 ->
+ 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
+ arg_ids
+#ifdef DEBUG
+ | length id_names /= length arg_tys
+ = pprPanic "tcCoreAlts" (ppr (con_name, names, rhs) $$
+ (ppr main_tyvars <+> ppr ex_tyvars) $$
+ ppr arg_tys)
+ | otherwise
+#endif
+ = zipWithEqual "tcCoreAlts" mkUserId id_names arg_tys
in
- tcExtendGlobalValEnv [deflt_id] $
- tcCoreExpr rhs `thenTc` \ rhs' ->
- returnTc (BindDefault deflt_id rhs')
-
-
-tcCorePrim (UfOtherOp op)
- = tcVar op `thenTc` \ op_id ->
- case isPrimitiveId_maybe op_id of
- Just prim_op -> returnTc prim_op
- Nothing -> pprPanic "tcCorePrim" (ppr op_id)
-
-tcCorePrim (UfCCallOp str casm gc arg_tys res_ty)
- = mapTc tcHsType arg_tys `thenTc` \ arg_tys' ->
- tcHsType res_ty `thenTc` \ res_ty' ->
- returnTc (CCallOp (Left str) casm gc cCallConv arg_tys' res_ty')
+ ASSERT( con `elem` cons && length inst_tys == length main_tyvars )
+ tcExtendTyVarEnv ex_tyvars' $
+ tcExtendGlobalValEnv arg_ids $
+ tcCoreExpr rhs `thenTc` \ rhs' ->
+ returnTc (DataCon con, ex_tyvars' ++ arg_ids, rhs')
\end{code}
\begin{code}
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