TcStmt, TcArithSeqInfo, TcRecordBinds,
TcHsModule, TcDictBinds,
TcForeignDecl,
+ TcCmd, TcCmdTop,
TypecheckedHsBinds, TypecheckedRuleDecl,
TypecheckedMonoBinds, TypecheckedPat,
TypecheckedGRHSs, TypecheckedGRHS,
TypecheckedRecordBinds, TypecheckedDictBinds,
TypecheckedMatchContext, TypecheckedCoreBind,
+ TypecheckedHsCmd, TypecheckedHsCmdTop,
mkHsTyApp, mkHsDictApp, mkHsConApp,
mkHsTyLam, mkHsDictLam, mkHsLet,
hsLitType, hsPatType,
+ -- Coercions
+ Coercion, ExprCoFn, PatCoFn,
+ (<$>), (<.>), mkCoercion,
+ idCoercion, isIdCoercion,
+
-- re-exported from TcMonad
TcId, TcIdSet,
import VarEnv
import BasicTypes ( RecFlag(..), Boxity(..), IPName(..), ipNameName, mapIPName )
import Maybes ( orElse )
+import Maybe ( isNothing )
import Unique ( Uniquable(..) )
import SrcLoc ( noSrcLoc )
import Bag
type TcHsModule = HsModule TcId
type TcForeignDecl = ForeignDecl TcId
type TcRuleDecl = RuleDecl TcId
+type TcCmd = HsCmd TcId
+type TcCmdTop = HsCmdTop TcId
type TypecheckedPat = OutPat Id
type TypecheckedMonoBinds = MonoBinds Id
type TypecheckedForeignDecl = ForeignDecl Id
type TypecheckedRuleDecl = RuleDecl Id
type TypecheckedCoreBind = (Id, CoreExpr)
+type TypecheckedHsCmd = HsCmd Id
+type TypecheckedHsCmdTop = HsCmdTop Id
type TypecheckedMatchContext = HsMatchContext Name -- Keeps consistency with
-- HsDo arg StmtContext
hsLitType (HsLitLit _ ty) = ty
\end{code}
+%************************************************************************
+%* *
+\subsection{Coercion functions}
+%* *
+%************************************************************************
+
\begin{code}
--- zonkId is used *during* typechecking just to zonk the Id's type
-zonkId :: TcId -> TcM TcId
-zonkId id
- = zonkTcType (idType id) `thenM` \ ty' ->
- returnM (setIdType id ty')
+type Coercion a = Maybe (a -> a)
+ -- Nothing => identity fn
+
+type ExprCoFn = Coercion TypecheckedHsExpr
+type PatCoFn = Coercion TcPat
+
+(<.>) :: Coercion a -> Coercion a -> Coercion a -- Composition
+Nothing <.> Nothing = Nothing
+Nothing <.> Just f = Just f
+Just f <.> Nothing = Just f
+Just f1 <.> Just f2 = Just (f1 . f2)
+
+(<$>) :: Coercion a -> a -> a
+Just f <$> e = f e
+Nothing <$> e = e
+
+mkCoercion :: (a -> a) -> Coercion a
+mkCoercion f = Just f
+
+idCoercion :: Coercion a
+idCoercion = Nothing
+
+isIdCoercion :: Coercion a -> Bool
+isIdCoercion = isNothing
\end{code}
%* *
%************************************************************************
-This zonking pass runs over the bindings
+\begin{code}
+-- zonkId is used *during* typechecking just to zonk the Id's type
+zonkId :: TcId -> TcM TcId
+zonkId id
+ = zonkTcType (idType id) `thenM` \ ty' ->
+ returnM (setIdType id ty')
+\end{code}
+
+The rest of the zonking is done *after* typechecking.
+The main zonking pass runs over the bindings
a) to convert TcTyVars to TyVars etc, dereferencing any bindings etc
b) convert unbound TcTyVar to Void
zonkExpr env (HsDo do_or_lc stmts ids ty src_loc)
= zonkStmts env stmts `thenM` \ new_stmts ->
zonkTcTypeToType env ty `thenM` \ new_ty ->
- returnM (HsDo do_or_lc new_stmts
- (zonkIdOccs env ids)
- new_ty src_loc)
+ zonkReboundNames env ids `thenM` \ new_ids ->
+ returnM (HsDo do_or_lc new_stmts new_ids
+ new_ty src_loc)
zonkExpr env (ExplicitList ty exprs)
= zonkTcTypeToType env ty `thenM` \ new_ty ->
= zonkExpr env expr `thenM` \ new_expr ->
returnM (HsSCC lbl new_expr)
+-- hdaume: core annotations
+zonkExpr env (HsCoreAnn lbl expr)
+ = zonkExpr env expr `thenM` \ new_expr ->
+ returnM (HsCoreAnn lbl new_expr)
+
zonkExpr env (TyLam tyvars expr)
= mappM zonkTcTyVarToTyVar tyvars `thenM` \ new_tyvars ->
-- No need to extend tyvar env; see AbsBinds
= zonkExpr env expr `thenM` \ new_expr ->
returnM (DictApp new_expr (zonkIdOccs env dicts))
+-- arrow notation extensions
+zonkExpr env (HsProc pat body src_loc)
+ = zonkPat env pat `thenM` \ (new_pat, new_ids) ->
+ let
+ env1 = extendZonkEnv env (bagToList new_ids)
+ in
+ zonkCmdTop env1 body `thenM` \ new_body ->
+ returnM (HsProc new_pat new_body src_loc)
+
+zonkExpr env (HsArrApp e1 e2 ty ho rl src_loc)
+ = zonkExpr env e1 `thenM` \ new_e1 ->
+ zonkExpr env e2 `thenM` \ new_e2 ->
+ zonkTcTypeToType env ty `thenM` \ new_ty ->
+ returnM (HsArrApp new_e1 new_e2 new_ty ho rl src_loc)
+
+zonkExpr env (HsArrForm op fixity args src_loc)
+ = zonkExpr env op `thenM` \ new_op ->
+ mappM (zonkCmdTop env) args `thenM` \ new_args ->
+ returnM (HsArrForm new_op fixity new_args src_loc)
+
+zonkCmdTop :: ZonkEnv -> TcCmdTop -> TcM TypecheckedHsCmdTop
+zonkCmdTop env (HsCmdTop cmd stack_tys ty ids)
+ = zonkExpr env cmd `thenM` \ new_cmd ->
+ mappM (zonkTcTypeToType env) stack_tys
+ `thenM` \ new_stack_tys ->
+ zonkTcTypeToType env ty `thenM` \ new_ty ->
+ zonkReboundNames env ids `thenM` \ new_ids ->
+ returnM (HsCmdTop new_cmd new_stack_tys new_ty new_ids)
+
+-------------------------------------------------------------------------
+zonkReboundNames :: ZonkEnv -> ReboundNames Id -> TcM (ReboundNames Id)
+zonkReboundNames env prs
+ = mapM zonk prs
+ where
+ zonk (n, e) = zonkExpr env e `thenM` \ new_e ->
+ returnM (n, new_e)
-------------------------------------------------------------------------
zonk_stmts env [] = returnM (env, [])
-zonk_stmts env (ParStmtOut bndrstmtss : stmts)
- = mappM (mappM zonkId) bndrss `thenM` \ new_bndrss ->
- mappM (zonkStmts env) stmtss `thenM` \ new_stmtss ->
+zonk_stmts env (ParStmt stmts_w_bndrs : stmts)
+ = mappM zonk_branch stmts_w_bndrs `thenM` \ new_stmts_w_bndrs ->
let
- new_binders = concat new_bndrss
+ new_binders = concat (map snd new_stmts_w_bndrs)
env1 = extendZonkEnv env new_binders
in
zonk_stmts env1 stmts `thenM` \ (env2, new_stmts) ->
- returnM (env2, ParStmtOut (zip new_bndrss new_stmtss) : new_stmts)
+ returnM (env2, ParStmt new_stmts_w_bndrs : new_stmts)
where
- (bndrss, stmtss) = unzip bndrstmtss
+ zonk_branch (stmts, bndrs) = zonk_stmts env stmts `thenM` \ (env1, new_stmts) ->
+ returnM (new_stmts, zonkIdOccs env1 bndrs)
-zonk_stmts env (RecStmt vs segStmts rets : stmts)
- = mappM zonkId vs `thenM` \ new_vs ->
+zonk_stmts env (RecStmt segStmts lvs rvs rets : stmts)
+ = zonkIdBndrs env rvs `thenM` \ new_rvs ->
let
- env1 = extendZonkEnv env new_vs
+ env1 = extendZonkEnv env new_rvs
in
zonk_stmts env1 segStmts `thenM` \ (env2, new_segStmts) ->
-- Zonk the ret-expressions in an envt that
-- has the polymorphic bindings in the envt
zonkExprs env2 rets `thenM` \ new_rets ->
- zonk_stmts env1 stmts `thenM` \ (env3, new_stmts) ->
- returnM (env3, RecStmt new_vs new_segStmts new_rets : new_stmts)
+ let
+ new_lvs = zonkIdOccs env2 lvs
+ env3 = extendZonkEnv env new_lvs -- Only the lvs are needed
+ in
+ zonk_stmts env3 stmts `thenM` \ (env4, new_stmts) ->
+ returnM (env4, RecStmt new_segStmts new_lvs new_rvs new_rets : new_stmts)
zonk_stmts env (ResultStmt expr locn : stmts)
= ASSERT( null stmts )
projects / ghc-hetmet.git / blobdiff