\section[TcIfaceSig]{Type checking of type signatures in interface files}
\begin{code}
-module TcIfaceSig ( tcInterfaceSigs ) where
+module TcIfaceSig ( tcInterfaceSigs,
+ tcCoreExpr,
+ tcCoreLamBndrs,
+ tcCoreBinds ) where
#include "HsVersions.h"
-import HsSyn ( HsDecl(..), IfaceSig(..) )
-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 TcEnv ( ValueEnv, tcExtendTyVarEnv,
- tcExtendGlobalValEnv, tcSetValueEnv,
- tcLookupTyConByKey, tcLookupValueMaybe,
- explicitLookupValue, badCon, badPrimOp
- )
-import TcType ( TcKind, kindToTcKind )
-
-import RnHsSyn ( RenamedHsDecl )
+import HsSyn ( CoreDecl(..), TyClDecl(..), HsTupCon(..) )
+import TcHsSyn ( TypecheckedCoreBind )
+import TcRnTypes
+import TcRnMonad
+import TcMonoType ( tcIfaceType, kcHsSigType )
+import TcEnv ( tcExtendTyVarEnv, tcExtendGlobalValEnv, tcLookupGlobalId,
+ tcLookupDataCon )
+
+import RnHsSyn ( RenamedCoreDecl, RenamedTyClDecl )
import HsCore
-import HsDecls ( HsIdInfo(..), HsStrictnessInfo(..) )
-import CallConv ( cCallConv )
-import Const ( Con(..), Literal(..) )
+import Literal ( Literal(..) )
import CoreSyn
-import CoreUtils ( coreExprType )
+import CoreUtils ( exprType )
import CoreUnfold
-import WwLib ( mkWrapper )
-import PrimOp ( PrimOp(..) )
+import CoreLint ( lintUnfolding )
+import WorkWrap ( mkWrapper )
-import Id ( Id, mkImportedId, mkUserId,
- isPrimitiveId_maybe, isDataConId_maybe
- )
+import Id ( Id, mkVanillaGlobal, mkLocalId )
+import MkId ( mkFCallId )
import IdInfo
-import DataCon ( dataConSig, dataConArgTys )
-import SpecEnv ( addToSpecEnv )
-import Type ( mkSynTy, mkTyVarTys, splitAlgTyConApp )
+import TyCon ( tyConDataCons, tyConTyVars )
+import DataCon ( DataCon, dataConWorkId, dataConExistentialTyVars, dataConArgTys )
+import Type ( mkTyVarTys, splitTyConApp )
+import TysWiredIn ( tupleCon )
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 Name ( Name )
+import UniqSupply ( initUs_ )
import Outputable
-import Util ( zipWithEqual )
+import Util ( zipWithEqual, dropList, equalLength )
+import HscTypes ( typeEnvIds )
+import CmdLineOpts ( DynFlag(..) )
\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
- -> TcM s [Id]
+tcInterfaceSigs :: [RenamedTyClDecl] -- Ignore non-sig-decls in these decls
+ -> TcM TcGblEnv
-
-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 unf_env (other_decl : rest) = tcInterfaceSigs unf_env rest
-
-tcInterfaceSigs unf_env [] = returnTc []
+-- May 2003:
+-- NOTE 1: careful about the side-effected EPS
+-- in the two tcExtendGlobalValueEnv calls
+-- NOTE 2: no point in tying the knot with fixM; all
+-- the important knot-tying comes via the PCS global variable
+
+tcInterfaceSigs decls =
+ zapEnv (fixM (tc_interface_sigs decls)) `thenM` \ (_,sig_ids) ->
+ -- The zapEnv dramatically trims the environment, solely
+ -- to plug the space leak that would otherwise be caused
+ -- by a rich environment bound into lots of lazy thunks
+ -- The thunks are the lazily-typechecked IdInfo of the
+ -- imported things.
+
+ tcExtendGlobalValEnv sig_ids getGblEnv `thenM` \ gbl_env ->
+ returnM gbl_env
+ -- We tie a knot so that the Ids read out of interfaces are in scope
+ -- when we read their pragmas.
+ -- What we rely on is that pragmas are typechecked lazily; if
+ -- any type errors are found (ie there's an inconsistency)
+ -- we silently discard the pragma
+ --
+ -- NOTE ALSO: the knot is in two parts:
+ -- * Ids defined in this module are added to the typechecker envt
+ -- which is knot-tied by the fixM.
+ -- * Imported Ids are side-effected into the PCS by the
+ -- tcExtendGlobalValueEnv, so they will be seen there provided
+ -- we don't look them up too early.
+ -- In both cases, we must defer lookups until after the knot is tied
+ --
+ -- We used to have a much bigger loop (in TcRnDriver), so that the
+ -- interface pragmas could mention variables bound in this module
+ -- (by mutual recn), but
+ -- (a) the knot is tiresomely big, and
+ -- (b) it black-holes when we have Template Haskell
+ --
+ -- For (b) consider: f = $(...h....)
+ -- where h is imported, and calls f via an hi-boot file.
+ -- This is bad! But it is not seen as a staging error, because h
+ -- is indeed imported. We don't want the type-checker to black-hole
+ -- when simplifying and compiling the splice!
+ --
+ -- Simple solution: discard any unfolding that mentions a variable
+ -- bound in this module (and hence not yet processed).
+ -- The discarding happens when forkM finds a type error.
+
+tc_interface_sigs decls ~(unf_env, _)
+ = sequenceM [do_one d | d@(IfaceSig {}) <- decls] `thenM` \ sig_ids ->
+ tcExtendGlobalValEnv sig_ids getGblEnv `thenM` \ gbl_env ->
+ returnM (gbl_env, sig_ids)
+ where
+ in_scope_vars = typeEnvIds (tcg_type_env unf_env)
+ -- 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 IfaceSig {tcdName = name, tcdType = ty,
+ tcdIdInfo = id_infos, tcdLoc = src_loc}
+ = addSrcLoc src_loc $
+ addErrCtxt (ifaceSigCtxt name) $
+ tcIfaceType ty `thenM` \ sigma_ty ->
+ tcIdInfo unf_env in_scope_vars name
+ sigma_ty id_infos `thenM` \ id_info ->
+ returnM (mkVanillaGlobal name sigma_ty id_info)
\end{code}
\begin{code}
-tcIdInfo unf_env name ty info info_ins
- = foldlTc tcPrag noIdInfo info_ins
+tcIdInfo unf_env in_scope_vars name ty info_ins
+ = setGblEnv unf_env $
+ -- Use the knot-tied environment for the IdInfo
+ -- In particular: typechecking unfoldings and worker names
+ foldlM tcPrag init_info info_ins
where
- tcPrag info (HsArity arity) = returnTc (arity `setArityInfo` info)
- tcPrag info (HsUpdate upd) = returnTc (upd `setUpdateInfo` info)
- tcPrag info (HsNoCafRefs) = returnTc (NoCafRefs `setCafInfo` 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' ->
- 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_prag `setInlinePragInfo` info1
- in
- returnTc info2
+ -- Set the CgInfo to something sensible but uninformative before
+ -- we start; default assumption is that it has CAFs
+ init_info = vanillaIdInfo
- tcPrag info (HsStrictness strict)
- = tcStrictness unf_env ty info strict
+ tcPrag info HsNoCafRefs = returnM (info `setCafInfo` NoCafRefs)
+ tcPrag info (HsArity arity) = returnM (info `setArityInfo` arity)
+ tcPrag info (HsStrictness str) = returnM (info `setAllStrictnessInfo` Just str)
+ tcPrag info (HsWorker nm arity) = tcWorkerInfo ty info nm arity
- tcPrag info (HsSpecialise tyvars tys rhs)
- = 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
- -- interface file generated by the compiler!
-
- tcPragExpr unf_env name rhs `thenNF_Tc` \ maybe_rhs' ->
+ tcPrag info (HsUnfold inline_prag expr)
+ = tcPragExpr name in_scope_vars expr `thenM` \ maybe_expr' ->
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
+ -- 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'
in
- returnTc (spec_env' `setSpecInfo` info)
+ returnM (info `setUnfoldingInfoLazily` unfold_info
+ `setInlinePragInfo` inline_prag)
\end{code}
\begin{code}
-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
- -- 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
-
- Nothing -> info
-
- has_worker = maybeToBool maybe_worker_id
- in
- returnTc (StrictnessInfo demands bot_result has_worker `setStrictnessInfo` info')
-\end{code}
-
-\begin{code}
-tcWorker unf_env Nothing = returnNF_Tc Nothing
+tcWorkerInfo ty info wkr_name arity
+ = forkM doc (tcVar wkr_name) `thenM` \ maybe_wkr_id ->
+ -- Watch out! We can't pull on unf_env too eagerly!
+ -- Hence the forkM
+
+ -- We return without testing maybe_wkr_id, but as soon as info is
+ -- looked at we will test it. That's ok, because its outside the
+ -- knot; and there seems no big reason to further defer the
+ -- tcVar lookup. (Contrast with tcPragExpr, where postponing walking
+ -- over the unfolding until it's actually used does seem worth while.)
+ newUniqueSupply `thenM` \ us ->
+ returnM (case maybe_wkr_id of
+ Nothing -> info
+ Just wkr_id -> info `setUnfoldingInfoLazily` mk_unfolding us wkr_id
+ `setWorkerInfo` HasWorker wkr_id arity)
-tcWorker unf_env (Just (worker_name,_))
- = returnNF_Tc (trace_maybe maybe_worker_id)
where
- maybe_worker_id = explicitLookupValue unf_env worker_name
+ doc = text "worker for" <+> ppr wkr_name
+
+ mk_unfolding us wkr_id = mkTopUnfolding (initUs_ us (mkWrapper ty strict_sig) wkr_id)
- -- 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
+ -- We are relying here on strictness info always appearing
+ -- before worker info, fingers crossed ....
+ strict_sig = case newStrictnessInfo info of
+ Just sig -> sig
+ Nothing -> pprPanic "Worker info but no strictness for" (ppr wkr_name)
\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 :: ValueEnv -> Name -> UfExpr Name -> NF_TcM s (Maybe CoreExpr)
-tcPragExpr unf_env name core_expr
- = forkNF_Tc (
- recoverNF_Tc no_unfolding (
- tcSetValueEnv unf_env $
- tcCoreExpr core_expr `thenTc` \ core_expr' ->
- returnTc (Just core_expr')
- ))
+tcPragExpr :: Name -> [Id] -> UfExpr Name -> TcM (Maybe CoreExpr)
+tcPragExpr name in_scope_vars expr
+ = forkM doc $
+ tcCoreExpr expr `thenM` \ core_expr' ->
+
+ -- Check for type consistency in the unfolding
+ ifOptM Opt_DoCoreLinting (
+ getSrcLocM `thenM` \ src_loc ->
+ case lintUnfolding src_loc in_scope_vars core_expr' of
+ Nothing -> returnM ()
+ Just fail_msg -> failWithTc ((doc <+> text "Failed Lint") $$ fail_msg)
+ ) `thenM_`
+
+ returnM core_expr'
where
- -- 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)
+ doc = text "unfolding of" <+> ppr name
\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
- = tcLookupValueMaybe 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]
+tcVar :: Name -> TcM Id
+ -- 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.
+tcVar name = tcLookupGlobalId name
\end{code}
UfCore expressions.
\begin{code}
-tcCoreExpr :: UfExpr Name -> TcM s CoreExpr
+tcCoreExpr :: UfExpr Name -> TcM CoreExpr
tcCoreExpr (UfType ty)
- = tcHsTypeKind ty `thenTc` \ (_, ty') ->
+ = tcIfaceType ty `thenM` \ ty' ->
-- It might not be of kind type
- returnTc (Type ty')
+ returnM (Type ty')
tcCoreExpr (UfVar name)
- = tcVar name `thenTc` \ id ->
- returnTc (Var id)
+ = tcVar name `thenM` \ id ->
+ returnM (Var id)
+
+tcCoreExpr (UfLit lit)
+ = returnM (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 `thenM` \ ty' ->
+ returnM (Lit (MachLitLit lit ty'))
-tcCoreExpr (UfCon con args)
- = tcUfCon con `thenTc` \ con' ->
- mapTc tcCoreExpr args `thenTc` \ args' ->
- returnTc (Con con' args')
+tcCoreExpr (UfFCall cc ty)
+ = tcIfaceType ty `thenM` \ ty' ->
+ newUnique `thenM` \ u ->
+ returnM (Var (mkFCallId u cc ty'))
-tcCoreExpr (UfTuple name args)
- = tcUfDataCon name `thenTc` \ con ->
- mapTc tcCoreExpr args `thenTc` \ args' ->
+tcCoreExpr (UfTuple (HsTupCon boxity arity) args)
+ = mappM tcCoreExpr args `thenM` \ 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)
+ returnM (mkApps (Var con_id) con_args)
+ where
+ con_id = dataConWorkId (tupleCon boxity arity)
+
tcCoreExpr (UfLam bndr body)
= tcCoreLamBndr bndr $ \ bndr' ->
- tcCoreExpr body `thenTc` \ body' ->
- returnTc (Lam bndr' body')
+ tcCoreExpr body `thenM` \ body' ->
+ returnM (Lam bndr' body')
tcCoreExpr (UfApp fun arg)
- = tcCoreExpr fun `thenTc` \ fun' ->
- tcCoreExpr arg `thenTc` \ arg' ->
- returnTc (App fun' arg')
+ = tcCoreExpr fun `thenM` \ fun' ->
+ tcCoreExpr arg `thenM` \ arg' ->
+ returnM (App fun' arg')
tcCoreExpr (UfCase scrut case_bndr alts)
- = tcCoreExpr scrut `thenTc` \ scrut' ->
+ = tcCoreExpr scrut `thenM` \ scrut' ->
let
- scrut_ty = coreExprType scrut'
- case_bndr' = mkUserId 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' ->
- returnTc (Case scrut' case_bndr' alts')
+ mappM (tcCoreAlt scrut_ty) alts `thenM` \ alts' ->
+ returnM (Case scrut' case_bndr' alts')
tcCoreExpr (UfLet (UfNonRec bndr rhs) body)
- = tcCoreExpr rhs `thenTc` \ rhs' ->
+ = tcCoreExpr rhs `thenM` \ rhs' ->
tcCoreValBndr bndr $ \ bndr' ->
- tcCoreExpr body `thenTc` \ body' ->
- returnTc (Let (NonRec bndr' rhs') body')
+ tcCoreExpr body `thenM` \ body' ->
+ returnM (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')
+ mappM tcCoreExpr rhss `thenM` \ rhss' ->
+ tcCoreExpr body `thenM` \ body' ->
+ returnM (Let (Rec (bndrs' `zip` rhss')) body')
where
(bndrs, rhss) = unzip pairs
tcCoreExpr (UfNote note expr)
- = tcCoreExpr expr `thenTc` \ expr' ->
+ = tcCoreExpr expr `thenM` \ expr' ->
case note of
- 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)
+ UfCoerce to_ty -> tcIfaceType to_ty `thenM` \ to_ty' ->
+ returnM (Note (Coerce to_ty'
+ (exprType expr')) expr')
+ UfInlineCall -> returnM (Note InlineCall expr')
+ UfInlineMe -> returnM (Note InlineMe expr')
+ UfSCC cc -> returnM (Note (SCC cc) expr')
\end{code}
\begin{code}
tcCoreLamBndr (UfValBinder name ty) thing_inside
- = tcHsType ty `thenTc` \ ty' ->
+ = tcIfaceType ty `thenM` \ ty' ->
let
- id = mkUserId name ty'
+ id = mkLocalId name ty'
in
tcExtendGlobalValEnv [id] $
thing_inside id
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
- = tcHsType ty `thenTc` \ ty' ->
+ = tcIfaceType ty `thenM` \ ty' ->
let
- id = mkUserId 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' ->
+ = mappM tcIfaceType tys `thenM` \ tys' ->
let
- ids = zipWithEqual "tcCoreValBndr" mkUserId names tys'
+ ids = zipWithEqual "tcCoreValBndr" mkLocalId names tys'
in
tcExtendGlobalValEnv ids $
thing_inside ids
\begin{code}
tcCoreAlt scrut_ty (UfDefault, names, rhs)
= ASSERT( null names )
- tcCoreExpr rhs `thenTc` \ rhs' ->
- returnTc (DEFAULT, [], rhs')
+ tcCoreExpr rhs `thenM` \ rhs' ->
+ returnM (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')
+ tcCoreExpr rhs `thenM` \ rhs' ->
+ returnM (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')
+ tcCoreExpr rhs `thenM` \ rhs' ->
+ tcIfaceType ty `thenM` \ ty' ->
+ returnM (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 `thenM` \ 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" mkUserId 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')
+ tcCoreExpr rhs `thenM` \ rhs' ->
+ returnM (DataAlt con, ex_tyvars' ++ arg_ids, rhs')
+
+
+tcConAlt :: UfConAlt Name -> TcM DataCon
+tcConAlt (UfTupleAlt (HsTupCon boxity arity))
+ = returnM (tupleCon boxity arity)
+
+tcConAlt (UfDataAlt con_name) -- When reading interface files
+ -- the con_name will be the real name of
+ -- the data con
+ = tcLookupDataCon con_name
\end{code}
+%************************************************************************
+%* *
+\subsection{Core decls}
+%* *
+%************************************************************************
+
+
+\begin{code}
+tcCoreBinds :: [RenamedCoreDecl] -> TcM [TypecheckedCoreBind]
+-- We don't assume the bindings are in dependency order
+-- So first build the environment, then check the RHSs
+tcCoreBinds ls = mappM tcCoreBinder ls `thenM` \ bndrs ->
+ tcExtendGlobalValEnv bndrs $
+ mappM (tcCoreBind bndrs) ls
+
+tcCoreBinder (CoreDecl nm ty _ _)
+ = kcHsSigType ty `thenM_`
+ tcIfaceType ty `thenM` \ ty' ->
+ returnM (mkLocalId nm ty')
+
+tcCoreBind bndrs (CoreDecl nm _ rhs loc)
+ = tcVar nm `thenM` \ id ->
+ tcCoreExpr rhs `thenM` \ rhs' ->
+ let
+ mb_err = lintUnfolding loc bndrs rhs'
+ in
+ (case mb_err of
+ Just err -> addErr err
+ Nothing -> returnM ()) `thenM_`
+
+ returnM (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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