\section[TcIfaceSig]{Type checking of type signatures in interface files}
\begin{code}
-#include "HsVersions.h"
-
module TcIfaceSig ( tcInterfaceSigs ) where
-IMP_Ubiq()
+#include "HsVersions.h"
+import HsSyn ( HsDecl(..), IfaceSig(..) )
import TcMonad
-import TcMonoType ( tcHsType )
-import TcEnv ( tcLookupGlobalValue, tcExtendTyVarEnv, tcExtendGlobalValEnv )
+import TcMonoType ( tcHsType, tcHsTypeKind, tcTyVarScope )
+import TcEnv ( tcExtendTyVarEnv, tcExtendGlobalValEnv,
+ tcLookupTyConByKey, tcLookupGlobalValueMaybe,
+ tcExplicitLookupGlobal
+ )
import TcKind ( TcKind, kindToTcKind )
-import HsSyn ( IfaceSig(..), HsDecl(..), TyDecl, ClassDecl, InstDecl, DefaultDecl, HsBinds,
- Fake, InPat, HsType )
import RnHsSyn ( RenamedHsDecl(..) )
import HsCore
-import HsDecls ( HsIdInfo(..) )
+import HsDecls ( HsIdInfo(..), HsStrictnessInfo(..) )
+import Literal ( Literal(..) )
import CoreSyn
+import CoreUtils ( coreExprType )
import CoreUnfold
import MagicUFs ( MagicUnfoldingFun )
-import SpecEnv ( SpecEnv )
+import WwLib ( mkWrapper )
import PrimOp ( PrimOp(..) )
-import Id ( GenId, mkImported, mkUserId, isPrimitiveId_maybe )
-import TyVar ( mkTyVar )
+import MkId ( mkImportedId, mkUserId )
+import Id ( Id, addInlinePragma, isPrimitiveId_maybe, dataConArgTys )
+import IdInfo
+import SpecEnv ( addToSpecEnv )
+import Type ( mkSynTy, splitAlgTyConApp )
+import TyVar ( mkSysTyVar )
import Name ( Name )
-import PragmaInfo ( PragmaInfo(..) )
-import Maybes ( maybeToBool )
-import Pretty
-import PprStyle ( PprStyle(..) )
-import Util ( zipWithEqual, panic, pprTrace, pprPanic )
+import Unique ( rationalTyConKey, uniqueOf )
+import TysWiredIn ( integerTy )
+import ErrUtils ( pprBagOfErrors )
+import Maybes ( maybeToBool, MaybeErr(..) )
+import Outputable
+import Util ( zipWithEqual )
-import IdInfo
\end{code}
Ultimately, type signatures in interfaces will have pragmatic
signatures.
\begin{code}
-tcInterfaceSigs :: [RenamedHsDecl] -> TcM s [Id]
- -- Ignore non-sig-decls in these decls
-
-tcInterfaceSigs (SigD (IfaceSig name ty id_infos src_loc) : rest)
- = tcAddSrcLoc src_loc $
- tcHsType ty `thenTc` \ sigma_ty ->
- tcIdInfo name noIdInfo id_infos `thenTc` \ id_info' ->
- let
- sig_id = mkImported name sigma_ty id_info'
- in
- tcInterfaceSigs rest `thenTc` \ sig_ids ->
+tcInterfaceSigs :: TcEnv s -- Envt to use when checking unfoldings
+ -> [RenamedHsDecl] -- Ignore non-sig-decls in these decls
+ -> TcM s [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 noIdInfo id_infos `thenTc` \ id_info ->
+ returnTc (mkImportedId name sigma_ty id_info)
+ )) `thenTc` \ sig_id ->
+ tcInterfaceSigs unf_env rest `thenTc` \ sig_ids ->
returnTc (sig_id : sig_ids)
-tcInterfaceSigs (other_decl : rest) = tcInterfaceSigs rest
+tcInterfaceSigs unf_env (other_decl : rest) = tcInterfaceSigs unf_env rest
-tcInterfaceSigs [] = returnTc []
+tcInterfaceSigs unf_env [] = returnTc []
\end{code}
-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}
-tcIdInfo name info [] = returnTc info
-
-tcIdInfo name info (HsArity arity : rest)
- = tcIdInfo name (info `addArityInfo` arity) rest
-
-tcIdInfo name info (HsUpdate upd : rest)
- = tcIdInfo name (info `addUpdateInfo` upd) rest
-
-tcIdInfo name info (HsFBType fb : rest)
- = tcIdInfo name (info `addFBTypeInfo` fb) rest
+tcIdInfo unf_env name ty info info_ins
+ = foldlTc tcPrag noIdInfo info_ins
+ 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 (HsUnfold inline expr)
+ = tcPragExpr unf_env name 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'
+ info1 = unfold_info `setUnfoldingInfo` info
+
+ info2 | inline = IWantToBeINLINEd `setInlinePragInfo` info1
+ | otherwise = info1
+ in
+ returnTc info2
+
+ tcPrag info (HsStrictness strict)
+ = tcStrictness unf_env ty info strict
+
+ tcPrag info (HsSpecialise tyvars tys rhs)
+ = tcTyVarScope tyvars $ \ tyvars' ->
+ mapTc tcHsType tys `thenTc` \ tys' ->
+ tcPragExpr unf_env name rhs `thenNF_Tc` \ maybe_rhs' ->
+ let
+ -- If spec_env isn't looked at, none of this
+ -- actually takes place
+ spec_env = specInfo info
+ spec_env' = case maybe_rhs' of
+ Nothing -> spec_env
+ Just rhs' -> case addToSpecEnv True {- overlap ok -} spec_env tyvars' tys' rhs' of
+ Succeeded spec_env' -> spec_env'
+ Failed err -> pprTrace "tcIdInfo: bad specialisation"
+ (ppr name <+> ppr err) $
+ spec_env
+ in
+ returnTc (spec_env' `setSpecInfo` info)
+\end{code}
-tcIdInfo name info (HsArgUsage au : rest)
- = tcIdInfo name (info `addArgUsageInfo` au) rest
+\begin{code}
+tcStrictness unf_env ty info (HsStrictnessInfo demands maybe_worker)
+ = tcWorker unf_env maybe_worker `thenNF_Tc` \ maybe_worker_id ->
+ uniqSMToTcM (mkWrapper ty demands) `thenNF_Tc` \ wrap_fn ->
+ let
+ -- Watch out! We can't pull on maybe_worker_id too eagerly!
+ info' = case maybe_worker_id of
+ Just worker_id -> setUnfoldingInfo (mkUnfolding (wrap_fn worker_id)) $
+ setInlinePragInfo IWantToBeINLINEd info
-tcIdInfo name info (HsDeforest df : rest)
- = tcIdInfo name (info `addDeforestInfo` df) rest
+ Nothing -> info
-tcIdInfo name info (HsUnfold expr : rest)
- = tcUnfolding name expr `thenNF_Tc` \ unfold_info ->
- tcIdInfo name (info `addUnfoldInfo` unfold_info) rest
+ has_worker = maybeToBool maybe_worker_id
+ in
+ returnTc (StrictnessInfo demands has_worker `setStrictnessInfo` info')
-tcIdInfo name info (HsStrictness strict : rest)
- = tcStrictness strict `thenTc` \ strict_info ->
- tcIdInfo name (info `addStrictnessInfo` strict_info) rest
+-- Boring to write these out, but the result type differs from the arg type...
+tcStrictness unf_env ty info HsBottom
+ = returnTc (BottomGuaranteed `setStrictnessInfo` info)
\end{code}
\begin{code}
-tcStrictness (StrictnessInfo demands (Just worker))
- = tcLookupGlobalValue worker `thenNF_Tc` \ worker_id ->
- returnTc (StrictnessInfo demands (Just worker_id))
-
--- Boring to write these out, but the result type differe from the arg type...
-tcStrictness (StrictnessInfo demands Nothing) = returnTc (StrictnessInfo demands Nothing)
-tcStrictness NoStrictnessInfo = returnTc NoStrictnessInfo
-tcStrictness BottomGuaranteed = returnTc BottomGuaranteed
+tcWorker unf_env Nothing = returnNF_Tc Nothing
+
+tcWorker unf_env (Just (worker_name,_))
+ = returnNF_Tc (trace_maybe maybe_worker_id)
+ where
+ maybe_worker_id = tcExplicitLookupGlobal 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
+ trace_maybe (Just x) = Just x
\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}
-tcUnfolding name core_expr
+tcPragExpr unf_env name core_expr
= forkNF_Tc (
- recoverNF_Tc (returnNF_Tc no_unfolding) (
+ recoverNF_Tc no_unfolding (
+ tcSetEnv unf_env $
tcCoreExpr core_expr `thenTc` \ core_expr' ->
- returnTc (mkUnfolding False core_expr')
+ returnTc (Just core_expr')
))
where
- no_unfolding = pprTrace "tcUnfolding failed:" (ppr PprDebug name) NoUnfolding
+ -- The trace tells what wasn't available, for the benefit of
+ -- compiler hackers who want to improve it!
+ no_unfolding = getErrsTc `thenNF_Tc` \ (warns,errs) ->
+ returnNF_Tc (pprTrace "tcUnfolding failed with:"
+ (hang (ppr name) 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 s Id
+tcVar name
+ = tcLookupGlobalValueMaybe 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]
\end{code}
UfCore expressions.
tcCoreExpr :: UfExpr Name -> TcM s CoreExpr
tcCoreExpr (UfVar name)
- = tcLookupGlobalValue name `thenNF_Tc` \ id ->
+ = tcVar name `thenTc` \ id ->
returnTc (Var id)
-tcCoreExpr (UfLit lit) = returnTc (Lit lit)
+-- 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)
- = tcLookupGlobalValue con `thenNF_Tc` \ con_id ->
+ = tcVar con `thenTc` \ con_id ->
mapTc tcCoreArg args `thenTc` \ args' ->
returnTc (Con con_id args')
returnTc (App fun' arg')
tcCoreExpr (UfCase scrut alts)
- = tcCoreExpr scrut `thenTc` \ scrut' ->
- tcCoreAlts alts `thenTc` \ alts' ->
+ = tcCoreExpr scrut `thenTc` \ scrut' ->
+ tcCoreAlts (coreExprType scrut') alts `thenTc` \ alts' ->
returnTc (Case scrut' alts')
-tcCoreExpr (UfSCC cc expr)
+tcCoreExpr (UfNote note expr)
= tcCoreExpr expr `thenTc` \ expr' ->
- returnTc (SCC cc expr')
-
-tcCoreExpr(UfCoerce coercion ty body)
- = tcCoercion coercion `thenTc` \ coercion' ->
- tcHsType ty `thenTc` \ ty' ->
- tcCoreExpr body `thenTc` \ body' ->
- returnTc (Coerce coercion' ty' body')
+ case note of
+ UfCoerce to_ty -> tcHsTypeKind 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
+\end{code}
+ returnTc (Note note' expr')
tcCoreExpr (UfLam bndr body)
= tcCoreLamBndr bndr $ \ bndr' ->
tcCoreLamBndr (UfValBinder name ty) thing_inside
= tcHsType ty `thenTc` \ ty' ->
let
- id = mkUserId name ty' NoPragmaInfo
+ id = mkUserId name ty'
in
tcExtendGlobalValEnv [id] $
thing_inside (ValBinder id)
tcCoreLamBndr (UfTyBinder name kind) thing_inside
= let
- tyvar = mkTyVar name kind
+ tyvar = mkSysTyVar (uniqueOf name) kind
in
tcExtendTyVarEnv [name] [(kindToTcKind kind, tyvar)] $
thing_inside (TyBinder tyvar)
-tcCoreLamBndr (UfUsageBinder name) thing_inside
- = error "tcCoreLamBndr: usage"
-
tcCoreValBndr (UfValBinder name ty) thing_inside
= tcHsType ty `thenTc` \ ty' ->
let
- id = mkUserId name ty' NoPragmaInfo
+ id = mkUserId name ty'
in
tcExtendGlobalValEnv [id] $
thing_inside id
tcCoreValBndrs bndrs thing_inside -- Expect them all to be ValBinders
= mapTc tcHsType tys `thenTc` \ tys' ->
let
- ids = zipWithEqual "tcCoreValBndr" mk_id names tys'
- mk_id name ty' = mkUserId name ty' NoPragmaInfo
+ ids = zipWithEqual "tcCoreValBndr" mkUserId names tys'
in
tcExtendGlobalValEnv ids $
thing_inside ids
\end{code}
\begin{code}
-tcCoreArg (UfVarArg v) = tcLookupGlobalValue v `thenNF_Tc` \ v' -> returnTc (VarArg v')
-tcCoreArg (UfTyArg ty) = tcHsType ty `thenTc` \ ty' -> returnTc (TyArg ty')
+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)
-tcCoreArg (UfUsageArg u) = error "tcCoreArg: usage"
-tcCoreAlts (UfAlgAlts alts deflt)
- = mapTc tc_alt alts `thenTc` \ alts' ->
- tcCoreDefault deflt `thenTc` \ deflt' ->
+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, bndrs, rhs) = tcLookupGlobalValue con `thenNF_Tc` \ con' ->
- tcCoreValBndrs bndrs $ \ bndrs' ->
- tcCoreExpr rhs `thenTc` \ rhs' ->
- returnTc (con', bndrs', rhs')
-
-tcCoreAlts (UfPrimAlts alts deflt)
- = mapTc tc_alt alts `thenTc` \ alts' ->
- tcCoreDefault deflt `thenTc` \ deflt' ->
+ 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 UfNoDefault = returnTc NoDefault
-tcCoreDefault (UfBindDefault bndr rhs) = tcCoreValBndr bndr $ \ bndr' ->
- tcCoreExpr rhs `thenTc` \ rhs' ->
- returnTc (BindDefault bndr' rhs')
-
-tcCoercion (UfIn n) = tcLookupGlobalValue n `thenNF_Tc` \ n' -> returnTc (CoerceIn n')
-tcCoercion (UfOut n) = tcLookupGlobalValue n `thenNF_Tc` \ n' -> returnTc (CoerceOut n')
+tcCoreDefault scrut_ty UfNoDefault = returnTc NoDefault
+tcCoreDefault scrut_ty (UfBindDefault name rhs)
+ = let
+ deflt_id = mkUserId name scrut_ty
+ in
+ tcExtendGlobalValEnv [deflt_id] $
+ tcCoreExpr rhs `thenTc` \ rhs' ->
+ returnTc (BindDefault deflt_id rhs')
+
tcCorePrim (UfOtherOp op)
- = tcLookupGlobalValue op `thenNF_Tc` \ op_id ->
+ = tcVar op `thenTc` \ op_id ->
case isPrimitiveId_maybe op_id of
Just prim_op -> returnTc prim_op
- Nothing -> pprPanic "tcCorePrim" (ppr PprDebug op_id)
+ Nothing -> pprPanic "tcCorePrim" (ppr op_id)
tcCorePrim (UfCCallOp str casm gc arg_tys res_ty)
= mapTc tcHsType arg_tys `thenTc` \ arg_tys' ->
returnTc (CCallOp str casm gc arg_tys' res_ty')
\end{code}
+\begin{code}
+ifaceSigCtxt sig_name
+ = hsep [ptext SLIT("In an interface-file signature for"), ppr sig_name]
+\end{code}
+
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