import PrelNames
import TyCon
import Type
-import Unify( dataConCannotMatch )
import SrcLoc
import UniqSet
import Util
-- if there are view patterns, just give up - don't know what the function is
check qs = (untidy_warns, shadowed_eqns)
where
- (warns, used_nos) = check' ([1..] `zip` map tidy_eqn qs)
+ tidy_qs = map tidy_eqn qs
+ (warns, used_nos) = check' ([1..] `zip` tidy_qs)
untidy_warns = map untidy_exhaustive warns
shadowed_eqns = [eqn | (eqn,i) <- qs `zip` [1..],
not (i `elementOfUniqSet` used_nos)]
tidy_pat (NPlusKPat id _ _ _) = WildPat (idType (unLoc id))
tidy_pat (ViewPat _ _ ty) = WildPat ty
- tidy_pat (NPat lit mb_neg eq) = tidyNPat lit mb_neg eq
-
tidy_pat pat@(ConPatOut { pat_con = L _ id, pat_args = ps })
= pat { pat_args = tidy_con id ps }
where
arity = length ps
- -- Unpack string patterns fully, so we can see when they overlap with
- -- each other, or even explicit lists of Chars.
- tidy_pat (LitPat lit)
+ tidy_pat (NPat lit mb_neg eq) = tidyNPat tidy_lit_pat lit mb_neg eq
+ tidy_pat (LitPat lit) = tidy_lit_pat lit
+
+ tidy_lit_pat :: HsLit -> Pat Id
+ -- Unpack string patterns fully, so we can see when they
+ -- overlap with each other, or even explicit lists of Chars.
+ tidy_lit_pat lit
| HsString s <- lit
- = unLoc $ foldr (\c pat -> mkPrefixConPat consDataCon [mk_char_lit c, pat] stringTy)
+ = unLoc $ foldr (\c pat -> mkPrefixConPat consDataCon [mkCharLitPat c, pat] stringTy)
(mkPrefixConPat nilDataCon [] stringTy) (unpackFS s)
| otherwise
= tidyLitPat lit
- where
- mk_char_lit c = mkPrefixConPat charDataCon [nlLitPat (HsCharPrim c)] charTy
-----------------
tidy_con :: DataCon -> HsConPatDetails Id -> HsConPatDetails Id
import StaticFlags
import CostCentre
import Id
-import Var
import VarSet
+import VarEnv
import DataCon
import TysWiredIn
import BasicTypes
-- We need the `ListComp' form to use `deListComp' (rather than the "do" form)
-- because the interpretation of `stmts' depends on what sort of thing it is.
--
- dsExpr (HsDo ListComp stmts body result_ty)
- = -- Special case for list comprehensions
- dsListComp stmts body elt_ty
- where
- [elt_ty] = tcTyConAppArgs result_ty
-
- dsExpr (HsDo DoExpr stmts body result_ty)
- = dsDo stmts body result_ty
-
- dsExpr (HsDo GhciStmt stmts body result_ty)
- = dsDo stmts body result_ty
-
- dsExpr (HsDo MDoExpr stmts body result_ty)
- = dsDo stmts body result_ty
-
- dsExpr (HsDo PArrComp stmts body result_ty)
- = -- Special case for array comprehensions
- dsPArrComp (map unLoc stmts) body elt_ty
- where
- [elt_ty] = tcTyConAppArgs result_ty
+ dsExpr (HsDo ListComp stmts res_ty) = dsListComp stmts res_ty
+ dsExpr (HsDo PArrComp stmts _) = dsPArrComp (map unLoc stmts)
+ dsExpr (HsDo DoExpr stmts _) = dsDo stmts
+ dsExpr (HsDo GhciStmt stmts _) = dsDo stmts
+ dsExpr (HsDo MDoExpr stmts _) = dsDo stmts
+ dsExpr (HsDo MonadComp stmts _) = dsMonadComp stmts
dsExpr (HsIf mb_fun guard_expr then_expr else_expr)
= do { pred <- dsLExpr guard_expr
mk_alt upd_fld_env con
= do { let (univ_tvs, ex_tvs, eq_spec,
- eq_theta, dict_theta, arg_tys, _) = dataConFullSig con
+ theta, arg_tys, _) = dataConFullSig con
subst = mkTopTvSubst (univ_tvs `zip` in_inst_tys)
-- I'm not bothering to clone the ex_tvs
; eqs_vars <- mapM newPredVarDs (substTheta subst (eqSpecPreds eq_spec))
- ; theta_vars <- mapM newPredVarDs (substTheta subst (eq_theta ++ dict_theta))
+ ; theta_vars <- mapM newPredVarDs (substTheta subst theta)
; arg_ids <- newSysLocalsDs (substTys subst arg_tys)
; let val_args = zipWithEqual "dsExpr:RecordUpd" mk_val_arg
(dataConFieldLabels con) arg_ids
wrap = mkWpEvVarApps theta_vars `WpCompose`
mkWpTyApps (mkTyVarTys ex_tvs) `WpCompose`
mkWpTyApps [ty | (tv, ty) <- univ_tvs `zip` out_inst_tys
- , isNothing (lookupTyVar wrap_subst tv) ]
+ , not (tv `elemVarEnv` wrap_subst) ]
rhs = foldl (\a b -> nlHsApp a b) inst_con val_args
-- Tediously wrap the application in a cast
-- Note [Update for GADTs]
wrapped_rhs | null eq_spec = rhs
| otherwise = mkLHsWrap (WpCast wrap_co) rhs
- wrap_co = mkTyConApp tycon [ lookup tv ty
- | (tv,ty) <- univ_tvs `zip` out_inst_tys]
- lookup univ_tv ty = case lookupTyVar wrap_subst univ_tv of
- Just ty' -> ty'
- Nothing -> ty
- wrap_subst = mkTopTvSubst [ (tv,mkSymCoercion (mkTyVarTy co_var))
- | ((tv,_),co_var) <- eq_spec `zip` eqs_vars ]
-
+ wrap_co = mkTyConAppCo tycon [ lookup tv ty
+ | (tv,ty) <- univ_tvs `zip` out_inst_tys]
+ lookup univ_tv ty = case lookupVarEnv wrap_subst univ_tv of
+ Just co' -> co'
+ Nothing -> mkReflCo ty
+ wrap_subst = mkVarEnv [ (tv, mkSymCo (mkCoVarCo co_var))
+ | ((tv,_),co_var) <- eq_spec `zip` eqs_vars ]
+
pat = noLoc $ ConPatOut { pat_con = noLoc con, pat_tvs = ex_tvs
, pat_dicts = eqs_vars ++ theta_vars
, pat_binds = emptyTcEvBinds
dsExpr (HsBinTick ixT ixF e) = do
e2 <- dsLExpr e
- do { ASSERT(exprType e2 `coreEqType` boolTy)
+ do { ASSERT(exprType e2 `eqType` boolTy)
mkBinaryTickBox ixT ixF e2
}
\end{code}
Haskell 98 report:
\begin{code}
- dsDo :: [LStmt Id]
- -> LHsExpr Id
- -> Type -- Type of the whole expression
- -> DsM CoreExpr
-
- dsDo stmts body result_ty
+ dsDo :: [LStmt Id] -> DsM CoreExpr
+ dsDo stmts
= goL stmts
where
- -- result_ty must be of the form (m b)
- (m_ty, _b_ty) = tcSplitAppTy result_ty
-
- goL [] = dsLExpr body
- goL ((L loc stmt):lstmts) = putSrcSpanDs loc (go loc stmt lstmts)
+ goL [] = panic "dsDo"
+ goL (L loc stmt:lstmts) = putSrcSpanDs loc (go loc stmt lstmts)
- go _ (ExprStmt rhs then_expr _) stmts
+ go _ (LastStmt body _) stmts
+ = ASSERT( null stmts ) dsLExpr body
+ -- The 'return' op isn't used for 'do' expressions
+
+ go _ (ExprStmt rhs then_expr _ _) stmts
= do { rhs2 <- dsLExpr rhs
- ; case tcSplitAppTy_maybe (exprType rhs2) of
- Just (container_ty, returning_ty) -> warnDiscardedDoBindings rhs container_ty returning_ty
- _ -> return ()
+ ; warnDiscardedDoBindings rhs (exprType rhs2)
; then_expr2 <- dsExpr then_expr
; rest <- goL stmts
; return (mkApps then_expr2 [rhs2, rest]) }
go loc (RecStmt { recS_stmts = rec_stmts, recS_later_ids = later_ids
, recS_rec_ids = rec_ids, recS_ret_fn = return_op
, recS_mfix_fn = mfix_op, recS_bind_fn = bind_op
- , recS_rec_rets = rec_rets }) stmts
+ , recS_rec_rets = rec_rets, recS_ret_ty = body_ty }) stmts
= ASSERT( length rec_ids > 0 )
goL (new_bind_stmt : stmts)
where
- -- returnE <- dsExpr return_id
- -- mfixE <- dsExpr mfix_id
- new_bind_stmt = L loc $ BindStmt (mkLHsPatTup later_pats) mfix_app
- bind_op
+ new_bind_stmt = L loc $ BindStmt (mkLHsPatTup later_pats)
+ mfix_app bind_op
noSyntaxExpr -- Tuple cannot fail
tup_ids = rec_ids ++ filterOut (`elem` rec_ids) later_ids
+ tup_ty = mkBoxedTupleTy (map idType tup_ids) -- Deals with singleton case
rec_tup_pats = map nlVarPat tup_ids
later_pats = rec_tup_pats
rets = map noLoc rec_rets
-
- mfix_app = nlHsApp (noLoc mfix_op) mfix_arg
- mfix_arg = noLoc $ HsLam (MatchGroup [mkSimpleMatch [mfix_pat] body]
- (mkFunTy tup_ty body_ty))
- mfix_pat = noLoc $ LazyPat $ mkLHsPatTup rec_tup_pats
- body = noLoc $ HsDo DoExpr rec_stmts return_app body_ty
- return_app = nlHsApp (noLoc return_op) (mkLHsTupleExpr rets)
- body_ty = mkAppTy m_ty tup_ty
- tup_ty = mkBoxedTupleTy (map idType tup_ids) -- Deals with singleton case
+ mfix_app = nlHsApp (noLoc mfix_op) mfix_arg
+ mfix_arg = noLoc $ HsLam (MatchGroup [mkSimpleMatch [mfix_pat] body]
+ (mkFunTy tup_ty body_ty))
+ mfix_pat = noLoc $ LazyPat $ mkLHsPatTup rec_tup_pats
+ body = noLoc $ HsDo DoExpr (rec_stmts ++ [ret_stmt]) body_ty
+ ret_app = nlHsApp (noLoc return_op) (mkLHsTupleExpr rets)
+ ret_stmt = noLoc $ mkLastStmt ret_app
+ -- This LastStmt will be desugared with dsDo,
+ -- which ignores the return_op in the LastStmt,
+ -- so we must apply the return_op explicitly
handle_failure :: LPat Id -> MatchResult -> SyntaxExpr Id -> DsM CoreExpr
-- In a do expression, pattern-match failure just calls
showSDoc (ppr (getLoc pat))
\end{code}
- Translation for RecStmt's:
- -----------------------------
- We turn (RecStmt [v1,..vn] stmts) into:
-
- (v1,..,vn) <- mfix (\~(v1,..vn). do stmts
- return (v1,..vn))
-
- \begin{code}
- {-
- dsMDo :: HsStmtContext Name
- -> [(Name,Id)]
- -> [LStmt Id]
- -> LHsExpr Id
- -> Type -- Type of the whole expression
- -> DsM CoreExpr
-
- dsMDo ctxt tbl stmts body result_ty
- = goL stmts
- where
- goL [] = dsLExpr body
- goL ((L loc stmt):lstmts) = putSrcSpanDs loc (go loc stmt lstmts)
-
- (m_ty, b_ty) = tcSplitAppTy result_ty -- result_ty must be of the form (m b)
- return_id = lookupEvidence tbl returnMName
- bind_id = lookupEvidence tbl bindMName
- then_id = lookupEvidence tbl thenMName
- fail_id = lookupEvidence tbl failMName
-
- go _ (LetStmt binds) stmts
- = do { rest <- goL stmts
- ; dsLocalBinds binds rest }
-
- go _ (ExprStmt rhs then_expr rhs_ty) stmts
- = do { rhs2 <- dsLExpr rhs
- ; warnDiscardedDoBindings rhs m_ty rhs_ty
- ; then_expr2 <- dsExpr then_expr
- ; rest <- goL stmts
- ; return (mkApps then_expr2 [rhs2, rest]) }
-
- go _ (BindStmt pat rhs bind_op _) stmts
- = do { body <- goL stmts
- ; rhs' <- dsLExpr rhs
- ; bind_op' <- dsExpr bind_op
- ; var <- selectSimpleMatchVarL pat
- ; match <- matchSinglePat (Var var) (StmtCtxt ctxt) pat
- result_ty (cantFailMatchResult body)
- ; match_code <- handle_failure pat match fail_op
- ; return (mkApps bind_op [rhs', Lam var match_code]) }
-
- go loc (RecStmt { recS_stmts = rec_stmts, recS_later_ids = later_ids
- , recS_rec_ids = rec_ids, recS_rec_rets = rec_rets
- , recS_mfix_fn = mfix_op, recS_bind_fn = bind_op }) stmts
- = ASSERT( length rec_ids > 0 )
- ASSERT( length rec_ids == length rec_rets )
- ASSERT( isEmptyTcEvBinds _ev_binds )
- pprTrace "dsMDo" (ppr later_ids) $
- goL (new_bind_stmt : stmts)
- where
- new_bind_stmt = L loc $ BindStmt (mk_tup_pat later_pats) mfix_app
- bind_op noSyntaxExpr
-
- -- Remove the later_ids that appear (without fancy coercions)
- -- in rec_rets, because there's no need to knot-tie them separately
- -- See Note [RecStmt] in HsExpr
- later_ids' = filter (`notElem` mono_rec_ids) later_ids
- mono_rec_ids = [ id | HsVar id <- rec_rets ]
-
- mfix_app = nlHsApp (noLoc mfix_op) mfix_arg
- mfix_arg = noLoc $ HsLam (MatchGroup [mkSimpleMatch [mfix_pat] body]
- (mkFunTy tup_ty body_ty))
-
- -- The rec_tup_pat must bind the rec_ids only; remember that the
- -- trimmed_laters may share the same Names
- -- Meanwhile, the later_pats must bind the later_vars
- rec_tup_pats = map mk_wild_pat later_ids' ++ map nlVarPat rec_ids
- later_pats = map nlVarPat later_ids' ++ map mk_later_pat rec_ids
- rets = map nlHsVar later_ids' ++ map noLoc rec_rets
-
- mfix_pat = noLoc $ LazyPat $ mk_tup_pat rec_tup_pats
- body = noLoc $ HsDo ctxt rec_stmts return_app body_ty
- body_ty = mkAppTy m_ty tup_ty
- tup_ty = mkBoxedTupleTy (map idType (later_ids' ++ rec_ids)) -- Deals with singleton case
-
- return_app = nlHsApp (noLoc return_op) (mkLHsTupleExpr rets)
-
- mk_wild_pat :: Id -> LPat Id
- mk_wild_pat v = noLoc $ WildPat $ idType v
-
- mk_later_pat :: Id -> LPat Id
- mk_later_pat v | v `elem` later_ids' = mk_wild_pat v
- | otherwise = nlVarPat v
-
- mk_tup_pat :: [LPat Id] -> LPat Id
- mk_tup_pat [p] = p
- mk_tup_pat ps = noLoc $ mkVanillaTuplePat ps Boxed
- -}
- \end{code}
-
%************************************************************************
%* *
| idName v `elem` conversionNames
, let fun_ty = exprType (co_fn (Var v))
, Just (arg_ty, res_ty) <- splitFunTy_maybe fun_ty
- , arg_ty `tcEqType` res_ty -- So we are converting ty -> ty
+ , arg_ty `eqType` res_ty -- So we are converting ty -> ty
= warnDs (vcat [ ptext (sLit "Call of") <+> ppr v <+> dcolon <+> ppr fun_ty
, nest 2 $ ptext (sLit "can probably be omitted")
, parens (ptext (sLit "Use -fno-warn-identities to suppress this messsage)"))
\begin{code}
-- Warn about certain types of values discarded in monadic bindings (#3263)
- warnDiscardedDoBindings :: LHsExpr Id -> Type -> Type -> DsM ()
- warnDiscardedDoBindings rhs container_ty returning_ty = do {
- -- Warn about discarding non-() things in 'monadic' binding
- ; warn_unused <- doptDs Opt_WarnUnusedDoBind
- ; if warn_unused && not (returning_ty `eqType` unitTy)
- then warnDs (unusedMonadBind rhs returning_ty)
- else do {
- -- Warn about discarding m a things in 'monadic' binding of the same type,
- -- but only if we didn't already warn due to Opt_WarnUnusedDoBind
- ; warn_wrong <- doptDs Opt_WarnWrongDoBind
- ; case tcSplitAppTy_maybe returning_ty of
- Just (returning_container_ty, _) -> when (warn_wrong && container_ty `eqType` returning_container_ty) $
- warnDs (wrongMonadBind rhs returning_ty)
- _ -> return () } }
+ warnDiscardedDoBindings :: LHsExpr Id -> Type -> DsM ()
+ warnDiscardedDoBindings rhs rhs_ty
+ | Just (m_ty, elt_ty) <- tcSplitAppTy_maybe rhs_ty
+ = do { -- Warn about discarding non-() things in 'monadic' binding
+ ; warn_unused <- doptDs Opt_WarnUnusedDoBind
+ ; if warn_unused && not (isUnitTy elt_ty)
+ then warnDs (unusedMonadBind rhs elt_ty)
+ else
+ -- Warn about discarding m a things in 'monadic' binding of the same type,
+ -- but only if we didn't already warn due to Opt_WarnUnusedDoBind
+ do { warn_wrong <- doptDs Opt_WarnWrongDoBind
+ ; case tcSplitAppTy_maybe elt_ty of
- Just (elt_m_ty, _) | warn_wrong, m_ty `tcEqType` elt_m_ty
++ Just (elt_m_ty, _) | warn_wrong, m_ty `eqType` elt_m_ty
+ -> warnDs (wrongMonadBind rhs elt_ty)
+ _ -> return () } }
+
+ | otherwise -- RHS does have type of form (m ty), which is wierd
+ = return () -- but at lesat this warning is irrelevant
unusedMonadBind :: LHsExpr Id -> Type -> SDoc
- unusedMonadBind rhs returning_ty
- = ptext (sLit "A do-notation statement discarded a result of type") <+> ppr returning_ty <> dot $$
+ unusedMonadBind rhs elt_ty
+ = ptext (sLit "A do-notation statement discarded a result of type") <+> ppr elt_ty <> dot $$
ptext (sLit "Suppress this warning by saying \"_ <- ") <> ppr rhs <> ptext (sLit "\",") $$
ptext (sLit "or by using the flag -fno-warn-unused-do-bind")
wrongMonadBind :: LHsExpr Id -> Type -> SDoc
- wrongMonadBind rhs returning_ty
- = ptext (sLit "A do-notation statement discarded a result of type") <+> ppr returning_ty <> dot $$
+ wrongMonadBind rhs elt_ty
+ = ptext (sLit "A do-notation statement discarded a result of type") <+> ppr elt_ty <> dot $$
ptext (sLit "Suppress this warning by saying \"_ <- ") <> ppr rhs <> ptext (sLit "\",") $$
ptext (sLit "or by using the flag -fno-warn-wrong-do-bind")
\end{code}
import MatchCon
import MatchLit
import Type
+import Coercion
import TysWiredIn
import ListSetOps
import SrcLoc
-- NPats: we *might* be able to replace these w/ a simpler form
tidy1 _ (NPat lit mb_neg eq)
- = return (idDsWrapper, tidyNPat lit mb_neg eq)
+ = return (idDsWrapper, tidyNPat tidyLitPat lit mb_neg eq)
-- BangPatterns: Pattern matching is already strict in constructors,
-- tuples etc, so the last case strips off the bang for thoses patterns.
sameGroup (PgLit _) (PgLit _) = True -- One case expression
sameGroup (PgN l1) (PgN l2) = l1==l2 -- Order is significant
sameGroup (PgNpK l1) (PgNpK l2) = l1==l2 -- See Note [Grouping overloaded literal patterns]
-sameGroup (PgCo t1) (PgCo t2) = t1 `coreEqType` t2
+sameGroup (PgCo t1) (PgCo t2) = t1 `eqType` t2
-- CoPats are in the same goup only if the type of the
-- enclosed pattern is the same. The patterns outside the CoPat
-- always have the same type, so this boils down to saying that
-- which resolve the overloading (e.g., fromInteger 1),
-- because these expressions get written as a bunch of different variables
-- (presumably to improve sharing)
- tcEqType (overLitType l) (overLitType l') && l == l'
+ eqType (overLitType l) (overLitType l') && l == l'
exp (HsApp e1 e2) (HsApp e1' e2') = lexp e1 e1' && lexp e2 e2'
-- the fixities have been straightened out by now, so it's safe
-- to ignore them?
---------
tup_arg (Present e1) (Present e2) = lexp e1 e2
- tup_arg (Missing t1) (Missing t2) = tcEqType t1 t2
+ tup_arg (Missing t1) (Missing t2) = eqType t1 t2
tup_arg _ _ = False
---------
-- equating different ways of writing a coercion)
wrap WpHole WpHole = True
wrap (WpCompose w1 w2) (WpCompose w1' w2') = wrap w1 w1' && wrap w2 w2'
- wrap (WpCast c) (WpCast c') = tcEqType c c'
+ wrap (WpCast c) (WpCast c') = coreEqCoercion c c'
wrap (WpEvApp et1) (WpEvApp et2) = ev_term et1 et2
- wrap (WpTyApp t) (WpTyApp t') = tcEqType t t'
+ wrap (WpTyApp t) (WpTyApp t') = eqType t t'
-- Enhancement: could implement equality for more wrappers
-- if it seems useful (lams and lets)
wrap _ _ = False
---------
ev_term :: EvTerm -> EvTerm -> Bool
ev_term (EvId a) (EvId b) = a==b
- ev_term (EvCoercion a) (EvCoercion b) = tcEqType a b
+ ev_term (EvCoercion a) (EvCoercion b) = coreEqCoercion a b
ev_term _ _ = False
---------
cannot jump to the third equation! Because the same argument might
match '2'!
Hence we don't regard 1 and 2, or (n+1) and (n+2), as part of the same group.
+
Default: False
Manual: True
- Flag ncg
- Description: Build the NCG.
- Default: False
- Manual: True
-
Flag stage1
Description: Is this stage 1?
Default: False
CPP-Options: -DGHCI
Include-Dirs: ../libffi/build/include
- if !flag(ncg)
- CPP-Options: -DOMIT_NATIVE_CODEGEN
-
Build-Depends: bin-package-db
Build-Depends: hoopl
Generics
InstEnv
TyCon
+ Kind
Type
TypeRep
Unify
MonadUtils
OrdList
Outputable
+ Pair
Panic
Pretty
Serialized
Vectorise.Exp
Vectorise
- -- We only need to expose more modules as some of the ncg code is used
- -- by the LLVM backend so its always included
- if flag(ncg)
- Exposed-Modules:
+ Exposed-Modules:
AsmCodeGen
TargetReg
NCGMonad
RegClass
PIC
Platform
- Alpha.Regs
- Alpha.RegInfo
- Alpha.Instr
- Alpha.CodeGen
X86.Regs
X86.RegInfo
X86.Instr
isBangHsBind, isLiftedPatBind,
isBangLPat, hsPatNeedsParens,
- isIrrefutableHsPat,
+ isIrrefutableHsPat,
pprParendLPat
) where
-- support hsPatType :: Pat Id -> Type
| VarPat id -- Variable
- | LazyPat (LPat id) -- Lazy pattern
+ | LazyPat (LPat id) -- Lazy pattern
| AsPat (Located id) (LPat id) -- As pattern
| ParPat (LPat id) -- Parenthesised pattern
| BangPat (LPat id) -- Bang pattern
| LitPat HsLit -- Used for *non-overloaded* literal patterns:
-- Int#, Char#, Int, Char, String, etc.
- | NPat (HsOverLit id) -- ALWAYS positive
+ | NPat -- Used for all overloaded literals,
+ -- including overloaded strings with -XOverloadedStrings
+ (HsOverLit id) -- ALWAYS positive
(Maybe (SyntaxExpr id)) -- Just (Name of 'negate') for negative
-- patterns, Nothing otherwise
(SyntaxExpr id) -- Equality checker, of type t->t->Bool
mkHsPar, mkHsApp, mkHsConApp, mkSimpleHsAlt,
mkSimpleMatch, unguardedGRHSs, unguardedRHS,
mkMatchGroup, mkMatch, mkHsLam, mkHsIf,
- mkHsWrap, mkLHsWrap, mkHsWrapCoI, mkLHsWrapCoI,
- coiToHsWrapper, mkHsLams, mkHsDictLet,
- mkHsOpApp, mkHsDo, mkHsComp, mkHsWrapPat, mkHsWrapPatCoI,
+ mkHsWrap, mkLHsWrap, mkHsWrapCo, mkLHsWrapCo,
+ coToHsWrapper, mkHsDictLet, mkHsLams,
- mkHsOpApp, mkHsDo, mkHsWrapPat, mkHsWrapPatCo,
++ mkHsOpApp, mkHsDo, mkHsComp, mkHsWrapPat, mkHsWrapPatCo,
nlHsTyApp, nlHsVar, nlHsLit, nlHsApp, nlHsApps, nlHsIntLit, nlHsVarApps,
nlHsDo, nlHsOpApp, nlHsLam, nlHsPar, nlHsIf, nlHsCase, nlList,
nlHsAppTy, nlHsTyVar, nlHsFunTy, nlHsTyConApp,
-- Stmts
- mkTransformStmt, mkTransformByStmt, mkExprStmt, mkBindStmt,
- mkGroupUsingStmt, mkGroupByStmt, mkGroupByUsingStmt,
+ mkTransformStmt, mkTransformByStmt, mkExprStmt, mkBindStmt, mkLastStmt,
+ emptyTransStmt, mkGroupUsingStmt, mkGroupByStmt, mkGroupByUsingStmt,
emptyRecStmt, mkRecStmt,
-- Template Haskell
import RdrName
import Var
import Coercion
-import Type
+import TypeRep
import DataCon
import Name
import NameSet
mkHsWrap co_fn e | isIdHsWrapper co_fn = e
| otherwise = HsWrap co_fn e
-mkHsWrapCoI :: CoercionI -> HsExpr id -> HsExpr id
-mkHsWrapCoI (IdCo _) e = e
-mkHsWrapCoI (ACo co) e = mkHsWrap (WpCast co) e
+mkHsWrapCo :: Coercion -> HsExpr id -> HsExpr id
+mkHsWrapCo (Refl _) e = e
+mkHsWrapCo co e = mkHsWrap (WpCast co) e
-mkLHsWrapCoI :: CoercionI -> LHsExpr id -> LHsExpr id
-mkLHsWrapCoI (IdCo _) e = e
-mkLHsWrapCoI (ACo co) (L loc e) = L loc (mkHsWrap (WpCast co) e)
+mkLHsWrapCo :: Coercion -> LHsExpr id -> LHsExpr id
+mkLHsWrapCo (Refl _) e = e
+mkLHsWrapCo co (L loc e) = L loc (mkHsWrap (WpCast co) e)
-coiToHsWrapper :: CoercionI -> HsWrapper
-coiToHsWrapper (IdCo _) = idHsWrapper
-coiToHsWrapper (ACo co) = WpCast co
+coToHsWrapper :: Coercion -> HsWrapper
+coToHsWrapper (Refl _) = idHsWrapper
+coToHsWrapper co = WpCast co
mkHsWrapPat :: HsWrapper -> Pat id -> Type -> Pat id
mkHsWrapPat co_fn p ty | isIdHsWrapper co_fn = p
| otherwise = CoPat co_fn p ty
-mkHsWrapPatCoI :: CoercionI -> Pat id -> Type -> Pat id
-mkHsWrapPatCoI (IdCo _) pat _ = pat
-mkHsWrapPatCoI (ACo co) pat ty = CoPat (WpCast co) pat ty
+mkHsWrapPatCo :: Coercion -> Pat id -> Type -> Pat id
+mkHsWrapPatCo (Refl _) pat _ = pat
+mkHsWrapPatCo co pat ty = CoPat (WpCast co) pat ty
mkHsLam :: [LPat id] -> LHsExpr id -> LHsExpr id
mkHsLam pats body = mkHsPar (L (getLoc body) (HsLam matches))
mkHsIntegral :: Integer -> PostTcType -> HsOverLit id
mkHsFractional :: Rational -> PostTcType -> HsOverLit id
mkHsIsString :: FastString -> PostTcType -> HsOverLit id
- mkHsDo :: HsStmtContext Name -> [LStmt id] -> LHsExpr id -> HsExpr id
+ mkHsDo :: HsStmtContext Name -> [LStmt id] -> HsExpr id
+ mkHsComp :: HsStmtContext Name -> [LStmt id] -> LHsExpr id -> HsExpr id
mkNPat :: HsOverLit id -> Maybe (SyntaxExpr id) -> Pat id
mkNPlusKPat :: Located id -> HsOverLit id -> Pat id
- mkTransformStmt :: [LStmt idL] -> LHsExpr idR -> StmtLR idL idR
- mkTransformByStmt :: [LStmt idL] -> LHsExpr idR -> LHsExpr idR -> StmtLR idL idR
-
+ mkLastStmt :: LHsExpr idR -> StmtLR idL idR
mkExprStmt :: LHsExpr idR -> StmtLR idL idR
mkBindStmt :: LPat idL -> LHsExpr idR -> StmtLR idL idR
noRebindableInfo :: Bool
noRebindableInfo = error "noRebindableInfo" -- Just another placeholder;
- mkHsDo ctxt stmts body = HsDo ctxt stmts body placeHolderType
+ mkHsDo ctxt stmts = HsDo ctxt stmts placeHolderType
+ mkHsComp ctxt stmts expr = mkHsDo ctxt (stmts ++ [last_stmt])
+ where
+ last_stmt = L (getLoc expr) $ mkLastStmt expr
mkHsIf :: LHsExpr id -> LHsExpr id -> LHsExpr id -> HsExpr id
mkHsIf c a b = HsIf (Just noSyntaxExpr) c a b
mkNPat lit neg = NPat lit neg noSyntaxExpr
mkNPlusKPat id lit = NPlusKPat id lit noSyntaxExpr noSyntaxExpr
- mkTransformStmt stmts usingExpr = TransformStmt stmts [] usingExpr Nothing
- mkTransformByStmt stmts usingExpr byExpr = TransformStmt stmts [] usingExpr (Just byExpr)
-
+ mkTransformStmt :: [LStmt idL] -> LHsExpr idR -> StmtLR idL idR
+ mkTransformByStmt :: [LStmt idL] -> LHsExpr idR -> LHsExpr idR -> StmtLR idL idR
mkGroupUsingStmt :: [LStmt idL] -> LHsExpr idR -> StmtLR idL idR
mkGroupByStmt :: [LStmt idL] -> LHsExpr idR -> StmtLR idL idR
mkGroupByUsingStmt :: [LStmt idL] -> LHsExpr idR -> LHsExpr idR -> StmtLR idL idR
- mkGroupUsingStmt stmts usingExpr = GroupStmt stmts [] Nothing (Left usingExpr)
- mkGroupByStmt stmts byExpr = GroupStmt stmts [] (Just byExpr) (Right noSyntaxExpr)
- mkGroupByUsingStmt stmts byExpr usingExpr = GroupStmt stmts [] (Just byExpr) (Left usingExpr)
-
- mkExprStmt expr = ExprStmt expr noSyntaxExpr placeHolderType
+ emptyTransStmt :: StmtLR idL idR
+ emptyTransStmt = TransStmt { trS_form = undefined, trS_stmts = [], trS_bndrs = []
+ , trS_by = Nothing, trS_using = noLoc noSyntaxExpr
+ , trS_ret = noSyntaxExpr, trS_bind = noSyntaxExpr
+ , trS_fmap = noSyntaxExpr }
+ mkTransformStmt ss u = emptyTransStmt { trS_form = ThenForm, trS_stmts = ss, trS_using = u }
+ mkTransformByStmt ss u b = emptyTransStmt { trS_form = ThenForm, trS_stmts = ss, trS_using = u, trS_by = Just b }
+ mkGroupByStmt ss b = emptyTransStmt { trS_form = GroupFormB, trS_stmts = ss, trS_by = Just b }
+ mkGroupUsingStmt ss u = emptyTransStmt { trS_form = GroupFormU, trS_stmts = ss, trS_using = u }
+ mkGroupByUsingStmt ss b u = emptyTransStmt { trS_form = GroupFormU, trS_stmts = ss
+ , trS_by = Just b, trS_using = u }
+
+ mkLastStmt expr = LastStmt expr noSyntaxExpr
+ mkExprStmt expr = ExprStmt expr noSyntaxExpr noSyntaxExpr placeHolderType
mkBindStmt pat expr = BindStmt pat expr noSyntaxExpr noSyntaxExpr
emptyRecStmt = RecStmt { recS_stmts = [], recS_later_ids = [], recS_rec_ids = []
, recS_ret_fn = noSyntaxExpr, recS_mfix_fn = noSyntaxExpr
, recS_bind_fn = noSyntaxExpr
- , recS_rec_rets = [] }
+ , recS_rec_rets = [], recS_ret_ty = placeHolderType }
mkRecStmt stmts = emptyRecStmt { recS_stmts = stmts }
nlWildPat :: LPat id
nlWildPat = noLoc (WildPat placeHolderType) -- Pre-typechecking
- nlHsDo :: HsStmtContext Name -> [LStmt id] -> LHsExpr id -> LHsExpr id
- nlHsDo ctxt stmts body = noLoc (mkHsDo ctxt stmts body)
+ nlHsDo :: HsStmtContext Name -> [LStmt id] -> LHsExpr id
+ nlHsDo ctxt stmts = noLoc (mkHsDo ctxt stmts)
nlHsOpApp :: LHsExpr id -> id -> LHsExpr id -> LHsExpr id
nlHsOpApp e1 op e2 = noLoc (mkHsOpApp e1 op e2)
-- Id Binders for a Stmt... [but what about pattern-sig type vars]?
collectStmtBinders (BindStmt pat _ _ _) = collectPatBinders pat
collectStmtBinders (LetStmt binds) = collectLocalBinders binds
- collectStmtBinders (ExprStmt _ _ _) = []
- collectStmtBinders (ParStmt xs) = collectLStmtsBinders
+ collectStmtBinders (ExprStmt {}) = []
+ collectStmtBinders (LastStmt {}) = []
+ collectStmtBinders (ParStmt xs _ _ _) = collectLStmtsBinders
$ concatMap fst xs
- collectStmtBinders (TransformStmt stmts _ _ _) = collectLStmtsBinders stmts
- collectStmtBinders (GroupStmt stmts _ _ _) = collectLStmtsBinders stmts
- collectStmtBinders (RecStmt { recS_stmts = ss }) = collectLStmtsBinders ss
+ collectStmtBinders (TransStmt { trS_stmts = stmts }) = collectLStmtsBinders stmts
+ collectStmtBinders (RecStmt { recS_stmts = ss }) = collectLStmtsBinders ss
----------------- Patterns --------------------------
hs_stmt (BindStmt pat _ _ _) = lPatImplicits pat
hs_stmt (LetStmt binds) = hs_local_binds binds
- hs_stmt (ExprStmt _ _ _) = emptyNameSet
- hs_stmt (ParStmt xs) = hs_lstmts $ concatMap fst xs
+ hs_stmt (ExprStmt {}) = emptyNameSet
+ hs_stmt (LastStmt {}) = emptyNameSet
+ hs_stmt (ParStmt xs _ _ _) = hs_lstmts $ concatMap fst xs
- hs_stmt (TransformStmt stmts _ _ _) = hs_lstmts stmts
- hs_stmt (GroupStmt stmts _ _ _) = hs_lstmts stmts
- hs_stmt (RecStmt { recS_stmts = ss }) = hs_lstmts ss
+ hs_stmt (TransStmt { trS_stmts = stmts }) = hs_lstmts stmts
+ hs_stmt (RecStmt { recS_stmts = ss }) = hs_lstmts ss
hs_local_binds (HsValBinds val_binds) = hsValBindsImplicits val_binds
hs_local_binds (HsIPBinds _) = emptyNameSet
\begin{code}
module IfaceSyn (
- module IfaceType, -- Re-export all this
+ module IfaceType,
- IfaceDecl(..), IfaceClassOp(..), IfaceConDecl(..), IfaceConDecls(..),
- IfaceExpr(..), IfaceAlt, IfaceNote(..), IfaceLetBndr(..),
- IfaceBinding(..), IfaceConAlt(..),
- IfaceIdInfo(..), IfaceIdDetails(..), IfaceUnfolding(..),
- IfaceInfoItem(..), IfaceRule(..), IfaceAnnotation(..), IfaceAnnTarget,
- IfaceInst(..), IfaceFamInst(..),
+ IfaceDecl(..), IfaceClassOp(..), IfaceConDecl(..), IfaceConDecls(..),
+ IfaceExpr(..), IfaceAlt, IfaceNote(..), IfaceLetBndr(..),
+ IfaceBinding(..), IfaceConAlt(..),
+ IfaceIdInfo(..), IfaceIdDetails(..), IfaceUnfolding(..),
+ IfaceInfoItem(..), IfaceRule(..), IfaceAnnotation(..), IfaceAnnTarget,
+ IfaceInst(..), IfaceFamInst(..),
- -- Misc
+ -- Misc
ifaceDeclSubBndrs, visibleIfConDecls,
-- Free Names
freeNamesIfDecl, freeNamesIfRule,
- -- Pretty printing
- pprIfaceExpr, pprIfaceDeclHead
+ -- Pretty printing
+ pprIfaceExpr, pprIfaceDeclHead
) where
#include "HsVersions.h"
import IfaceType
import CoreSyn( DFunArg, dfunArgExprs )
- import PprCore() -- Printing DFunArgs
+ import PprCore() -- Printing DFunArgs
import Demand
import Annotations
import Class
- import NameSet
+ import NameSet
import Name
import CostCentre
import Literal
%************************************************************************
- %* *
- Data type declarations
- %* *
+ %* *
+ Data type declarations
+ %* *
%************************************************************************
\begin{code}
- data IfaceDecl
- = IfaceId { ifName :: OccName,
- ifType :: IfaceType,
- ifIdDetails :: IfaceIdDetails,
- ifIdInfo :: IfaceIdInfo }
-
- | IfaceData { ifName :: OccName, -- Type constructor
- ifTyVars :: [IfaceTvBndr], -- Type variables
- ifCtxt :: IfaceContext, -- The "stupid theta"
- ifCons :: IfaceConDecls, -- Includes new/data info
- ifRec :: RecFlag, -- Recursive or not?
- ifGadtSyntax :: Bool, -- True <=> declared using
- -- GADT syntax
- ifGeneric :: Bool, -- True <=> generic converter
- -- functions available
- -- We need this for imported
- -- data decls, since the
- -- imported modules may have
- -- been compiled with
- -- different flags to the
- -- current compilation unit
+ data IfaceDecl
+ = IfaceId { ifName :: OccName,
+ ifType :: IfaceType,
+ ifIdDetails :: IfaceIdDetails,
+ ifIdInfo :: IfaceIdInfo }
+
+ | IfaceData { ifName :: OccName, -- Type constructor
+ ifTyVars :: [IfaceTvBndr], -- Type variables
+ ifCtxt :: IfaceContext, -- The "stupid theta"
+ ifCons :: IfaceConDecls, -- Includes new/data info
+ ifRec :: RecFlag, -- Recursive or not?
+ ifGadtSyntax :: Bool, -- True <=> declared using
+ -- GADT syntax
+ ifGeneric :: Bool, -- True <=> generic converter
+ -- functions available
+ -- We need this for imported
+ -- data decls, since the
+ -- imported modules may have
+ -- been compiled with
+ -- different flags to the
+ -- current compilation unit
ifFamInst :: Maybe (IfaceTyCon, [IfaceType])
-- Just <=> instance of family
- -- Invariant:
+ -- Invariant:
-- ifCons /= IfOpenDataTyCon
-- for family instances
}
- | IfaceSyn { ifName :: OccName, -- Type constructor
- ifTyVars :: [IfaceTvBndr], -- Type variables
- ifSynKind :: IfaceKind, -- Kind of the *rhs* (not of the tycon)
- ifSynRhs :: Maybe IfaceType, -- Just rhs for an ordinary synonyn
- -- Nothing for an open family
+ | IfaceSyn { ifName :: OccName, -- Type constructor
+ ifTyVars :: [IfaceTvBndr], -- Type variables
+ ifSynKind :: IfaceKind, -- Kind of the *rhs* (not of the tycon)
+ ifSynRhs :: Maybe IfaceType, -- Just rhs for an ordinary synonyn
+ -- Nothing for an open family
ifFamInst :: Maybe (IfaceTyCon, [IfaceType])
-- Just <=> instance of family
-- Invariant: ifOpenSyn == False
-- for family instances
}
- | IfaceClass { ifCtxt :: IfaceContext, -- Context...
- ifName :: OccName, -- Name of the class
- ifTyVars :: [IfaceTvBndr], -- Type variables
- ifFDs :: [FunDep FastString], -- Functional dependencies
- ifATs :: [IfaceDecl], -- Associated type families
- ifSigs :: [IfaceClassOp], -- Method signatures
- ifRec :: RecFlag -- Is newtype/datatype associated with the class recursive?
+ | IfaceClass { ifCtxt :: IfaceContext, -- Context...
+ ifName :: OccName, -- Name of the class
+ ifTyVars :: [IfaceTvBndr], -- Type variables
+ ifFDs :: [FunDep FastString], -- Functional dependencies
+ ifATs :: [IfaceDecl], -- Associated type families
+ ifSigs :: [IfaceClassOp], -- Method signatures
+ ifRec :: RecFlag -- Is newtype/datatype associated
+ -- with the class recursive?
}
| IfaceForeign { ifName :: OccName, -- Needs expanding when we move
-- beyond .NET
- ifExtName :: Maybe FastString }
+ ifExtName :: Maybe FastString }
data IfaceClassOp = IfaceClassOp OccName DefMethSpec IfaceType
- -- Nothing => no default method
- -- Just False => ordinary polymorphic default method
- -- Just True => generic default method
+ -- Nothing => no default method
+ -- Just False => ordinary polymorphic default method
+ -- Just True => generic default method
data IfaceConDecls
- = IfAbstractTyCon -- No info
- | IfOpenDataTyCon -- Open data family
- | IfDataTyCon [IfaceConDecl] -- data type decls
- | IfNewTyCon IfaceConDecl -- newtype decls
+ = IfAbstractTyCon -- No info
+ | IfOpenDataTyCon -- Open data family
+ | IfDataTyCon [IfaceConDecl] -- data type decls
+ | IfNewTyCon IfaceConDecl -- newtype decls
visibleIfConDecls :: IfaceConDecls -> [IfaceConDecl]
visibleIfConDecls IfAbstractTyCon = []
visibleIfConDecls (IfDataTyCon cs) = cs
visibleIfConDecls (IfNewTyCon c) = [c]
- data IfaceConDecl
+ data IfaceConDecl
= IfCon {
- ifConOcc :: OccName, -- Constructor name
- ifConWrapper :: Bool, -- True <=> has a wrapper
- ifConInfix :: Bool, -- True <=> declared infix
- ifConUnivTvs :: [IfaceTvBndr], -- Universal tyvars
- ifConExTvs :: [IfaceTvBndr], -- Existential tyvars
- ifConEqSpec :: [(OccName,IfaceType)], -- Equality contraints
- ifConCtxt :: IfaceContext, -- Non-stupid context
- ifConArgTys :: [IfaceType], -- Arg types
- ifConFields :: [OccName], -- ...ditto... (field labels)
- ifConStricts :: [HsBang]} -- Empty (meaning all lazy),
- -- or 1-1 corresp with arg tys
-
- data IfaceInst
- = IfaceInst { ifInstCls :: IfExtName, -- See comments with
- ifInstTys :: [Maybe IfaceTyCon], -- the defn of Instance
- ifDFun :: IfExtName, -- The dfun
- ifOFlag :: OverlapFlag, -- Overlap flag
- ifInstOrph :: Maybe OccName } -- See Note [Orphans]
- -- There's always a separate IfaceDecl for the DFun, which gives
- -- its IdInfo with its full type and version number.
- -- The instance declarations taken together have a version number,
- -- and we don't want that to wobble gratuitously
- -- If this instance decl is *used*, we'll record a usage on the dfun;
- -- and if the head does not change it won't be used if it wasn't before
+ ifConOcc :: OccName, -- Constructor name
+ ifConWrapper :: Bool, -- True <=> has a wrapper
+ ifConInfix :: Bool, -- True <=> declared infix
+ ifConUnivTvs :: [IfaceTvBndr], -- Universal tyvars
+ ifConExTvs :: [IfaceTvBndr], -- Existential tyvars
+ ifConEqSpec :: [(OccName,IfaceType)], -- Equality contraints
+ ifConCtxt :: IfaceContext, -- Non-stupid context
+ ifConArgTys :: [IfaceType], -- Arg types
+ ifConFields :: [OccName], -- ...ditto... (field labels)
+ ifConStricts :: [HsBang]} -- Empty (meaning all lazy),
+ -- or 1-1 corresp with arg tys
+
+ data IfaceInst
+ = IfaceInst { ifInstCls :: IfExtName, -- See comments with
+ ifInstTys :: [Maybe IfaceTyCon], -- the defn of Instance
+ ifDFun :: IfExtName, -- The dfun
+ ifOFlag :: OverlapFlag, -- Overlap flag
+ ifInstOrph :: Maybe OccName } -- See Note [Orphans]
+ -- There's always a separate IfaceDecl for the DFun, which gives
+ -- its IdInfo with its full type and version number.
+ -- The instance declarations taken together have a version number,
+ -- and we don't want that to wobble gratuitously
+ -- If this instance decl is *used*, we'll record a usage on the dfun;
+ -- and if the head does not change it won't be used if it wasn't before
data IfaceFamInst
= IfaceFamInst { ifFamInstFam :: IfExtName -- Family tycon
- , ifFamInstTys :: [Maybe IfaceTyCon] -- Rough match types
- , ifFamInstTyCon :: IfaceTyCon -- Instance decl
- }
+ , ifFamInstTys :: [Maybe IfaceTyCon] -- Rough match types
+ , ifFamInstTyCon :: IfaceTyCon -- Instance decl
+ }
data IfaceRule
- = IfaceRule {
- ifRuleName :: RuleName,
- ifActivation :: Activation,
- ifRuleBndrs :: [IfaceBndr], -- Tyvars and term vars
- ifRuleHead :: IfExtName, -- Head of lhs
- ifRuleArgs :: [IfaceExpr], -- Args of LHS
- ifRuleRhs :: IfaceExpr,
- ifRuleAuto :: Bool,
- ifRuleOrph :: Maybe OccName -- Just like IfaceInst
+ = IfaceRule {
+ ifRuleName :: RuleName,
+ ifActivation :: Activation,
+ ifRuleBndrs :: [IfaceBndr], -- Tyvars and term vars
+ ifRuleHead :: IfExtName, -- Head of lhs
+ ifRuleArgs :: [IfaceExpr], -- Args of LHS
+ ifRuleRhs :: IfaceExpr,
+ ifRuleAuto :: Bool,
+ ifRuleOrph :: Maybe OccName -- Just like IfaceInst
}
data IfaceAnnotation
| IfDFunId Int -- Number of silent args
data IfaceIdInfo
- = NoInfo -- When writing interface file without -O
- | HasInfo [IfaceInfoItem] -- Has info, and here it is
+ = NoInfo -- When writing interface file without -O
+ | HasInfo [IfaceInfoItem] -- Has info, and here it is
-- Here's a tricky case:
-- * Compile with -O module A, and B which imports A.f
-- * Change function f in A, and recompile without -O
-- * When we read in old A.hi we read in its IdInfo (as a thunk)
- -- (In earlier GHCs we used to drop IdInfo immediately on reading,
- -- but we do not do that now. Instead it's discarded when the
- -- ModIface is read into the various decl pools.)
+ -- (In earlier GHCs we used to drop IdInfo immediately on reading,
+ -- but we do not do that now. Instead it's discarded when the
+ -- ModIface is read into the various decl pools.)
-- * The version comparsion sees that new (=NoInfo) differs from old (=HasInfo *)
- -- and so gives a new version.
+ -- and so gives a new version.
data IfaceInfoItem
- = HsArity Arity
+ = HsArity Arity
| HsStrictness StrictSig
| HsInline InlinePragma
- | HsUnfold Bool -- True <=> isNonRuleLoopBreaker is true
- IfaceUnfolding -- See Note [Expose recursive functions]
+ | HsUnfold Bool -- True <=> isNonRuleLoopBreaker is true
+ IfaceUnfolding -- See Note [Expose recursive functions]
| HsNoCafRefs
-- NB: Specialisations and rules come in separately and are
-- only later attached to the Id. Partial reason: some are orphans.
- data IfaceUnfolding
+ data IfaceUnfolding
= IfCoreUnfold Bool IfaceExpr -- True <=> INLINABLE, False <=> regular unfolding
-- Possibly could eliminate the Bool here, the information
-- is also in the InlinePragma.
- | IfCompulsory IfaceExpr -- Only used for default methods, in fact
+ | IfCompulsory IfaceExpr -- Only used for default methods, in fact
| IfInlineRule Arity -- INLINE pragmas
- Bool -- OK to inline even if *un*-saturated
- Bool -- OK to inline even if context is boring
- IfaceExpr
+ Bool -- OK to inline even if *un*-saturated
+ Bool -- OK to inline even if context is boring
+ IfaceExpr
- | IfExtWrapper Arity IfExtName -- NB: sometimes we need a IfExtName (not just IfLclName)
- | IfLclWrapper Arity IfLclName -- because the worker can simplify to a function in
- -- another module.
+ | IfExtWrapper Arity IfExtName -- NB: sometimes we need a IfExtName (not just IfLclName)
+ | IfLclWrapper Arity IfLclName -- because the worker can simplify to a function in
+ -- another module.
| IfDFunUnfold [DFunArg IfaceExpr]
--------------------------------
data IfaceExpr
- = IfaceLcl IfLclName
+ = IfaceLcl IfLclName
| IfaceExt IfExtName
| IfaceType IfaceType
- | IfaceTuple Boxity [IfaceExpr] -- Saturated; type arguments omitted
- | IfaceLam IfaceBndr IfaceExpr
- | IfaceApp IfaceExpr IfaceExpr
- | IfaceCase IfaceExpr IfLclName IfaceType [IfaceAlt]
- | IfaceLet IfaceBinding IfaceExpr
- | IfaceNote IfaceNote IfaceExpr
+ | IfaceCo IfaceType -- We re-use IfaceType for coercions
+ | IfaceTuple Boxity [IfaceExpr] -- Saturated; type arguments omitted
+ | IfaceLam IfaceBndr IfaceExpr
+ | IfaceApp IfaceExpr IfaceExpr
+ | IfaceCase IfaceExpr IfLclName [IfaceAlt]
+ | IfaceLet IfaceBinding IfaceExpr
+ | IfaceNote IfaceNote IfaceExpr
| IfaceCast IfaceExpr IfaceCoercion
- | IfaceLit Literal
- | IfaceFCall ForeignCall IfaceType
+ | IfaceLit Literal
+ | IfaceFCall ForeignCall IfaceType
| IfaceTick Module Int
data IfaceNote = IfaceSCC CostCentre
| IfaceCoreNote String
type IfaceAlt = (IfaceConAlt, [IfLclName], IfaceExpr)
- -- Note: IfLclName, not IfaceBndr (and same with the case binder)
- -- We reconstruct the kind/type of the thing from the context
- -- thus saving bulk in interface files
+ -- Note: IfLclName, not IfaceBndr (and same with the case binder)
+ -- We reconstruct the kind/type of the thing from the context
+ -- thus saving bulk in interface files
data IfaceConAlt = IfaceDefault
- | IfaceDataAlt IfExtName
- | IfaceTupleAlt Boxity
- | IfaceLitAlt Literal
+ | IfaceDataAlt IfExtName
+ | IfaceTupleAlt Boxity
+ | IfaceLitAlt Literal
data IfaceBinding
- = IfaceNonRec IfaceLetBndr IfaceExpr
- | IfaceRec [(IfaceLetBndr, IfaceExpr)]
+ = IfaceNonRec IfaceLetBndr IfaceExpr
+ | IfaceRec [(IfaceLetBndr, IfaceExpr)]
-- IfaceLetBndr is like IfaceIdBndr, but has IdInfo too
-- It's used for *non-top-level* let/rec binders
and suppose we are compiling module X:
module X where
- import M
- data T = ...
- instance C Int T where ...
+ import M
+ data T = ...
+ instance C Int T where ...
This instance is an orphan, because when compiling a third module Y we
might get a constraint (C Int v), and we'd want to improve v to T. So
If there are fundeps, then for every fundep, at least one of the
names free in a *non-determined* part of the instance head is
- defined in this module.
+ defined in this module.
(Note that these conditions hold trivially if the class is locally
defined.)
and suppose we are compiling module X:
module X where
- import M
- data S = ...
- data T = ...
- instance C S T where ...
+ import M
+ data S = ...
+ data T = ...
+ instance C S T where ...
If we base the instance verion on T, I'm worried that changing S to S'
would change T's version, but not S or S'. But an importing module might
Note [Versioning of rules]
~~~~~~~~~~~~~~~~~~~~~~~~~~
- A rule that is not an orphan has an ifRuleOrph field of (Just n), where
- n appears on the LHS of the rule; any change in the rule changes the version of n.
+ A rule that is not an orphan has an ifRuleOrph field of (Just n), where n
+ appears on the LHS of the rule; any change in the rule changes the version of n.
\begin{code}
ifaceDeclSubBndrs (IfaceData {ifName = tc_occ,
ifCons = IfNewTyCon (
IfCon { ifConOcc = con_occ }),
- ifFamInst = famInst})
+ ifFamInst = famInst})
= -- implicit coerion and (possibly) family instance coercion
(mkNewTyCoOcc tc_occ) : (famInstCo famInst tc_occ) ++
-- data constructor and worker (newtypes don't have a wrapper)
ifaceDeclSubBndrs (IfaceData {ifName = tc_occ,
- ifCons = IfDataTyCon cons,
- ifFamInst = famInst})
+ ifCons = IfDataTyCon cons,
+ ifFamInst = famInst})
= -- (possibly) family instance coercion;
-- there is no implicit coercion for non-newtypes
famInstCo famInst tc_occ
++ concatMap dc_occs cons
where
dc_occs con_decl
- | has_wrapper = [con_occ, work_occ, wrap_occ]
- | otherwise = [con_occ, work_occ]
- where
- con_occ = ifConOcc con_decl -- DataCon namespace
- wrap_occ = mkDataConWrapperOcc con_occ -- Id namespace
- work_occ = mkDataConWorkerOcc con_occ -- Id namespace
- has_wrapper = ifConWrapper con_decl -- This is the reason for
- -- having the ifConWrapper field!
-
- ifaceDeclSubBndrs (IfaceClass {ifCtxt = sc_ctxt, ifName = cls_occ,
- ifSigs = sigs, ifATs = ats })
+ | has_wrapper = [con_occ, work_occ, wrap_occ]
+ | otherwise = [con_occ, work_occ]
+ where
+ con_occ = ifConOcc con_decl -- DataCon namespace
+ wrap_occ = mkDataConWrapperOcc con_occ -- Id namespace
+ work_occ = mkDataConWorkerOcc con_occ -- Id namespace
+ has_wrapper = ifConWrapper con_decl -- This is the reason for
+ -- having the ifConWrapper field!
+
+ ifaceDeclSubBndrs (IfaceClass {ifCtxt = sc_ctxt, ifName = cls_occ,
+ ifSigs = sigs, ifATs = ats })
= -- dictionary datatype:
-- type constructor
- tc_occ :
+ tc_occ :
-- (possibly) newtype coercion
co_occs ++
-- data constructor (DataCon namespace)
n_ctxt = length sc_ctxt
n_sigs = length sigs
tc_occ = mkClassTyConOcc cls_occ
- dc_occ = mkClassDataConOcc cls_occ
+ dc_occ = mkClassDataConOcc cls_occ
co_occs | is_newtype = [mkNewTyCoOcc tc_occ]
- | otherwise = []
+ | otherwise = []
dcww_occ = mkDataConWorkerOcc dc_occ
- is_newtype = n_sigs + n_ctxt == 1 -- Sigh
+ is_newtype = n_sigs + n_ctxt == 1 -- Sigh
ifaceDeclSubBndrs (IfaceSyn {ifName = tc_occ,
- ifFamInst = famInst})
+ ifFamInst = famInst})
= famInstCo famInst tc_occ
ifaceDeclSubBndrs _ = []
ppr = pprIfaceDecl
pprIfaceDecl :: IfaceDecl -> SDoc
- pprIfaceDecl (IfaceId {ifName = var, ifType = ty,
+ pprIfaceDecl (IfaceId {ifName = var, ifType = ty,
ifIdDetails = details, ifIdInfo = info})
- = sep [ ppr var <+> dcolon <+> ppr ty,
- nest 2 (ppr details),
- nest 2 (ppr info) ]
+ = sep [ ppr var <+> dcolon <+> ppr ty,
+ nest 2 (ppr details),
+ nest 2 (ppr info) ]
pprIfaceDecl (IfaceForeign {ifName = tycon})
= hsep [ptext (sLit "foreign import type dotnet"), ppr tycon]
- pprIfaceDecl (IfaceSyn {ifName = tycon, ifTyVars = tyvars,
- ifSynRhs = Just mono_ty,
+ pprIfaceDecl (IfaceSyn {ifName = tycon, ifTyVars = tyvars,
+ ifSynRhs = Just mono_ty,
ifFamInst = mbFamInst})
= hang (ptext (sLit "type") <+> pprIfaceDeclHead [] tycon tyvars)
4 (vcat [equals <+> ppr mono_ty, pprFamily mbFamInst])
- pprIfaceDecl (IfaceSyn {ifName = tycon, ifTyVars = tyvars,
- ifSynRhs = Nothing, ifSynKind = kind })
+ pprIfaceDecl (IfaceSyn {ifName = tycon, ifTyVars = tyvars,
+ ifSynRhs = Nothing, ifSynKind = kind })
= hang (ptext (sLit "type family") <+> pprIfaceDeclHead [] tycon tyvars)
4 (dcolon <+> ppr kind)
pprIfaceDecl (IfaceData {ifName = tycon, ifGeneric = gen, ifCtxt = context,
- ifTyVars = tyvars, ifCons = condecls,
- ifRec = isrec, ifFamInst = mbFamInst})
+ ifTyVars = tyvars, ifCons = condecls,
+ ifRec = isrec, ifFamInst = mbFamInst})
= hang (pp_nd <+> pprIfaceDeclHead context tycon tyvars)
4 (vcat [pprRec isrec, pprGen gen, pp_condecls tycon condecls,
- pprFamily mbFamInst])
+ pprFamily mbFamInst])
where
pp_nd = case condecls of
- IfAbstractTyCon -> ptext (sLit "data")
- IfOpenDataTyCon -> ptext (sLit "data family")
- IfDataTyCon _ -> ptext (sLit "data")
- IfNewTyCon _ -> ptext (sLit "newtype")
-
- pprIfaceDecl (IfaceClass {ifCtxt = context, ifName = clas, ifTyVars = tyvars,
- ifFDs = fds, ifATs = ats, ifSigs = sigs,
- ifRec = isrec})
+ IfAbstractTyCon -> ptext (sLit "data")
+ IfOpenDataTyCon -> ptext (sLit "data family")
+ IfDataTyCon _ -> ptext (sLit "data")
+ IfNewTyCon _ -> ptext (sLit "newtype")
+
+ pprIfaceDecl (IfaceClass {ifCtxt = context, ifName = clas, ifTyVars = tyvars,
+ ifFDs = fds, ifATs = ats, ifSigs = sigs,
+ ifRec = isrec})
= hang (ptext (sLit "class") <+> pprIfaceDeclHead context clas tyvars <+> pprFundeps fds)
4 (vcat [pprRec isrec,
- sep (map ppr ats),
- sep (map ppr sigs)])
+ sep (map ppr ats),
+ sep (map ppr sigs)])
pprRec :: RecFlag -> SDoc
pprRec isrec = ptext (sLit "RecFlag") <+> ppr isrec
pprIfaceDeclHead :: IfaceContext -> OccName -> [IfaceTvBndr] -> SDoc
pprIfaceDeclHead context thing tyvars
- = hsep [pprIfaceContext context, parenSymOcc thing (ppr thing),
- pprIfaceTvBndrs tyvars]
+ = hsep [pprIfaceContext context, parenSymOcc thing (ppr thing),
+ pprIfaceTvBndrs tyvars]
pp_condecls :: OccName -> IfaceConDecls -> SDoc
pp_condecls _ IfAbstractTyCon = ptext (sLit "{- abstract -}")
pp_condecls tc (IfNewTyCon c) = equals <+> pprIfaceConDecl tc c
pp_condecls _ IfOpenDataTyCon = empty
pp_condecls tc (IfDataTyCon cs) = equals <+> sep (punctuate (ptext (sLit " |"))
- (map (pprIfaceConDecl tc) cs))
+ (map (pprIfaceConDecl tc) cs))
pprIfaceConDecl :: OccName -> IfaceConDecl -> SDoc
pprIfaceConDecl tc
- (IfCon { ifConOcc = name, ifConInfix = is_infix, ifConWrapper = has_wrap,
- ifConUnivTvs = univ_tvs, ifConExTvs = ex_tvs,
- ifConEqSpec = eq_spec, ifConCtxt = ctxt, ifConArgTys = arg_tys,
- ifConStricts = strs, ifConFields = fields })
+ (IfCon { ifConOcc = name, ifConInfix = is_infix, ifConWrapper = has_wrap,
+ ifConUnivTvs = univ_tvs, ifConExTvs = ex_tvs,
+ ifConEqSpec = eq_spec, ifConCtxt = ctxt, ifConArgTys = arg_tys,
+ ifConStricts = strs, ifConFields = fields })
= sep [main_payload,
- if is_infix then ptext (sLit "Infix") else empty,
- if has_wrap then ptext (sLit "HasWrapper") else empty,
- ppUnless (null strs) $
- nest 4 (ptext (sLit "Stricts:") <+> hsep (map ppr_bang strs)),
- ppUnless (null fields) $
- nest 4 (ptext (sLit "Fields:") <+> hsep (map ppr fields))]
+ if is_infix then ptext (sLit "Infix") else empty,
+ if has_wrap then ptext (sLit "HasWrapper") else empty,
+ ppUnless (null strs) $
+ nest 4 (ptext (sLit "Stricts:") <+> hsep (map ppr_bang strs)),
+ ppUnless (null fields) $
+ nest 4 (ptext (sLit "Fields:") <+> hsep (map ppr fields))]
where
- ppr_bang HsNoBang = char '_' -- Want to see these
+ ppr_bang HsNoBang = char '_' -- Want to see these
ppr_bang bang = ppr bang
-
- main_payload = ppr name <+> dcolon <+>
- pprIfaceForAllPart (univ_tvs ++ ex_tvs) (eq_ctxt ++ ctxt) pp_tau
- eq_ctxt = [(IfaceEqPred (IfaceTyVar (occNameFS tv)) ty)
- | (tv,ty) <- eq_spec]
+ main_payload = ppr name <+> dcolon <+>
+ pprIfaceForAllPart (univ_tvs ++ ex_tvs) (eq_ctxt ++ ctxt) pp_tau
- -- A bit gruesome this, but we can't form the full con_tau, and ppr it,
- -- because we don't have a Name for the tycon, only an OccName
+ eq_ctxt = [(IfaceEqPred (IfaceTyVar (occNameFS tv)) ty)
+ | (tv,ty) <- eq_spec]
+
+ -- A bit gruesome this, but we can't form the full con_tau, and ppr it,
+ -- because we don't have a Name for the tycon, only an OccName
pp_tau = case map pprParendIfaceType arg_tys ++ [pp_res_ty] of
- (t:ts) -> fsep (t : map (arrow <+>) ts)
- [] -> panic "pp_con_taus"
+ (t:ts) -> fsep (t : map (arrow <+>) ts)
+ [] -> panic "pp_con_taus"
pp_res_ty = ppr tc <+> fsep [ppr tv | (tv,_) <- univ_tvs]
instance Outputable IfaceRule where
ppr (IfaceRule { ifRuleName = name, ifActivation = act, ifRuleBndrs = bndrs,
- ifRuleHead = fn, ifRuleArgs = args, ifRuleRhs = rhs })
+ ifRuleHead = fn, ifRuleArgs = args, ifRuleRhs = rhs })
= sep [hsep [doubleQuotes (ftext name), ppr act,
- ptext (sLit "forall") <+> pprIfaceBndrs bndrs],
- nest 2 (sep [ppr fn <+> sep (map pprParendIfaceExpr args),
- ptext (sLit "=") <+> ppr rhs])
+ ptext (sLit "forall") <+> pprIfaceBndrs bndrs],
+ nest 2 (sep [ppr fn <+> sep (map pprParendIfaceExpr args),
+ ptext (sLit "=") <+> ppr rhs])
]
instance Outputable IfaceInst where
- ppr (IfaceInst {ifDFun = dfun_id, ifOFlag = flag,
- ifInstCls = cls, ifInstTys = mb_tcs})
- = hang (ptext (sLit "instance") <+> ppr flag
- <+> ppr cls <+> brackets (pprWithCommas ppr_rough mb_tcs))
+ ppr (IfaceInst {ifDFun = dfun_id, ifOFlag = flag,
+ ifInstCls = cls, ifInstTys = mb_tcs})
+ = hang (ptext (sLit "instance") <+> ppr flag
+ <+> ppr cls <+> brackets (pprWithCommas ppr_rough mb_tcs))
2 (equals <+> ppr dfun_id)
instance Outputable IfaceFamInst where
ppr (IfaceFamInst {ifFamInstFam = fam, ifFamInstTys = mb_tcs,
- ifFamInstTyCon = tycon_id})
- = hang (ptext (sLit "family instance") <+>
- ppr fam <+> brackets (pprWithCommas ppr_rough mb_tcs))
+ ifFamInstTyCon = tycon_id})
+ = hang (ptext (sLit "family instance") <+>
+ ppr fam <+> brackets (pprWithCommas ppr_rough mb_tcs))
2 (equals <+> ppr tycon_id)
ppr_rough :: Maybe IfaceTyCon -> SDoc
pprParendIfaceExpr :: IfaceExpr -> SDoc
pprParendIfaceExpr = pprIfaceExpr parens
+ -- | Pretty Print an IfaceExpre
+ --
+ -- The first argument should be a function that adds parens in context that need
+ -- an atomic value (e.g. function args)
pprIfaceExpr :: (SDoc -> SDoc) -> IfaceExpr -> SDoc
- -- The function adds parens in context that need
- -- an atomic value (e.g. function args)
pprIfaceExpr _ (IfaceLcl v) = ppr v
pprIfaceExpr _ (IfaceExt v) = ppr v
pprIfaceExpr _ (IfaceFCall cc ty) = braces (ppr cc <+> ppr ty)
pprIfaceExpr _ (IfaceTick m ix) = braces (text "tick" <+> ppr m <+> ppr ix)
pprIfaceExpr _ (IfaceType ty) = char '@' <+> pprParendIfaceType ty
+pprIfaceExpr _ (IfaceCo co) = text "@~" <+> pprParendIfaceType co
pprIfaceExpr add_par app@(IfaceApp _ _) = add_par (pprIfaceApp app [])
pprIfaceExpr _ (IfaceTuple c as) = tupleParens c (interpp'SP as)
- pprIfaceExpr add_par e@(IfaceLam _ _)
+ pprIfaceExpr add_par i@(IfaceLam _ _)
= add_par (sep [char '\\' <+> sep (map ppr bndrs) <+> arrow,
- pprIfaceExpr noParens body])
- where
- (bndrs,body) = collect [] e
+ pprIfaceExpr noParens body])
+ where
+ (bndrs,body) = collect [] i
collect bs (IfaceLam b e) = collect (b:bs) e
collect bs e = (reverse bs, e)
-pprIfaceExpr add_par (IfaceCase scrut bndr ty [(con, bs, rhs)])
- = add_par (sep [ptext (sLit "case") <+> char '@' <+> pprParendIfaceType ty
- <+> pprIfaceExpr noParens scrut <+> ptext (sLit "of")
- <+> ppr bndr <+> char '{' <+> ppr_con_bs con bs <+> arrow,
- pprIfaceExpr noParens rhs <+> char '}'])
+pprIfaceExpr add_par (IfaceCase scrut bndr [(con, bs, rhs)])
+ = add_par (sep [ptext (sLit "case")
+ <+> pprIfaceExpr noParens scrut <+> ptext (sLit "of")
+ <+> ppr bndr <+> char '{' <+> ppr_con_bs con bs <+> arrow,
+ pprIfaceExpr noParens rhs <+> char '}'])
-pprIfaceExpr add_par (IfaceCase scrut bndr ty alts)
- = add_par (sep [ptext (sLit "case") <+> char '@' <+> pprParendIfaceType ty
- <+> pprIfaceExpr noParens scrut <+> ptext (sLit "of")
- <+> ppr bndr <+> char '{',
- nest 2 (sep (map ppr_alt alts)) <+> char '}'])
+pprIfaceExpr add_par (IfaceCase scrut bndr alts)
+ = add_par (sep [ptext (sLit "case")
+ <+> pprIfaceExpr noParens scrut <+> ptext (sLit "of")
+ <+> ppr bndr <+> char '{',
+ nest 2 (sep (map ppr_alt alts)) <+> char '}'])
pprIfaceExpr _ (IfaceCast expr co)
= sep [pprParendIfaceExpr expr,
- nest 2 (ptext (sLit "`cast`")),
- pprParendIfaceType co]
+ nest 2 (ptext (sLit "`cast`")),
+ pprParendIfaceType co]
pprIfaceExpr add_par (IfaceLet (IfaceNonRec b rhs) body)
- = add_par (sep [ptext (sLit "let {"),
- nest 2 (ppr_bind (b, rhs)),
- ptext (sLit "} in"),
- pprIfaceExpr noParens body])
+ = add_par (sep [ptext (sLit "let {"),
+ nest 2 (ppr_bind (b, rhs)),
+ ptext (sLit "} in"),
+ pprIfaceExpr noParens body])
pprIfaceExpr add_par (IfaceLet (IfaceRec pairs) body)
= add_par (sep [ptext (sLit "letrec {"),
- nest 2 (sep (map ppr_bind pairs)),
- ptext (sLit "} in"),
- pprIfaceExpr noParens body])
+ nest 2 (sep (map ppr_bind pairs)),
+ ptext (sLit "} in"),
+ pprIfaceExpr noParens body])
- pprIfaceExpr add_par (IfaceNote note body) = add_par (ppr note <+> pprParendIfaceExpr body)
+ pprIfaceExpr add_par (IfaceNote note body) = add_par $ ppr note
+ <+> pprParendIfaceExpr body
ppr_alt :: (IfaceConAlt, [IfLclName], IfaceExpr) -> SDoc
- ppr_alt (con, bs, rhs) = sep [ppr_con_bs con bs,
- arrow <+> pprIfaceExpr noParens rhs]
+ ppr_alt (con, bs, rhs) = sep [ppr_con_bs con bs,
+ arrow <+> pprIfaceExpr noParens rhs]
ppr_con_bs :: IfaceConAlt -> [IfLclName] -> SDoc
ppr_con_bs (IfaceTupleAlt tup_con) bs = tupleParens tup_con (interpp'SP bs)
- ppr_con_bs con bs = ppr con <+> hsep (map ppr bs)
-
+ ppr_con_bs con bs = ppr con <+> hsep (map ppr bs)
+
ppr_bind :: (IfaceLetBndr, IfaceExpr) -> SDoc
- ppr_bind (IfLetBndr b ty info, rhs)
+ ppr_bind (IfLetBndr b ty info, rhs)
= sep [hang (ppr b <+> dcolon <+> ppr ty) 2 (ppr info),
- equals <+> pprIfaceExpr noParens rhs]
+ equals <+> pprIfaceExpr noParens rhs]
------------------
pprIfaceApp :: IfaceExpr -> [SDoc] -> SDoc
- pprIfaceApp (IfaceApp fun arg) args = pprIfaceApp fun (nest 2 (pprParendIfaceExpr arg) : args)
- pprIfaceApp fun args = sep (pprParendIfaceExpr fun : args)
+ pprIfaceApp (IfaceApp fun arg) args = pprIfaceApp fun $
+ nest 2 (pprParendIfaceExpr arg) : args
+ pprIfaceApp fun args = sep (pprParendIfaceExpr fun : args)
------------------
instance Outputable IfaceNote where
ppr (IfaceSCC cc) = pprCostCentreCore cc
- ppr (IfaceCoreNote s) = ptext (sLit "__core_note") <+> pprHsString (mkFastString s)
+ ppr (IfaceCoreNote s) = ptext (sLit "__core_note")
+ <+> pprHsString (mkFastString s)
instance Outputable IfaceConAlt where
ppr IfaceDefault = text "DEFAULT"
ppr (IfaceLitAlt l) = ppr l
ppr (IfaceDataAlt d) = ppr d
- ppr (IfaceTupleAlt _) = panic "ppr IfaceConAlt"
+ ppr (IfaceTupleAlt _) = panic "ppr IfaceConAlt"
-- IfaceTupleAlt is handled by the case-alternative printer
------------------
instance Outputable IfaceIdDetails where
- ppr IfVanillaId = empty
+ ppr IfVanillaId = empty
ppr (IfRecSelId tc b) = ptext (sLit "RecSel") <+> ppr tc
- <+> if b then ptext (sLit "<naughty>") else empty
+ <+> if b then ptext (sLit "<naughty>") else empty
ppr (IfDFunId ns) = ptext (sLit "DFunId") <> brackets (int ns)
instance Outputable IfaceIdInfo where
ppr NoInfo = empty
- ppr (HasInfo is) = ptext (sLit "{-") <+> pprWithCommas ppr is <+> ptext (sLit "-}")
+ ppr (HasInfo is) = ptext (sLit "{-") <+> pprWithCommas ppr is
+ <+> ptext (sLit "-}")
instance Outputable IfaceInfoItem where
- ppr (HsUnfold lb unf) = ptext (sLit "Unfolding") <> ppWhen lb (ptext (sLit "(loop-breaker)"))
+ ppr (HsUnfold lb unf) = ptext (sLit "Unfolding")
+ <> ppWhen lb (ptext (sLit "(loop-breaker)"))
<> colon <+> ppr unf
ppr (HsInline prag) = ptext (sLit "Inline:") <+> ppr prag
ppr (HsArity arity) = ptext (sLit "Arity:") <+> int arity
ppr (HsStrictness str) = ptext (sLit "Strictness:") <+> pprIfaceStrictSig str
- ppr HsNoCafRefs = ptext (sLit "HasNoCafRefs")
+ ppr HsNoCafRefs = ptext (sLit "HasNoCafRefs")
instance Outputable IfaceUnfolding where
ppr (IfCompulsory e) = ptext (sLit "<compulsory>") <+> parens (ppr e)
- ppr (IfCoreUnfold s e) = (if s then ptext (sLit "<stable>") else empty) <+> parens (ppr e)
- ppr (IfInlineRule a uok bok e) = sep [ptext (sLit "InlineRule") <+> ppr (a,uok,bok),
- pprParendIfaceExpr e]
+ ppr (IfCoreUnfold s e) = (if s then ptext (sLit "<stable>") else empty)
+ <+> parens (ppr e)
+ ppr (IfInlineRule a uok bok e) = sep [ptext (sLit "InlineRule")
+ <+> ppr (a,uok,bok),
+ pprParendIfaceExpr e]
ppr (IfLclWrapper a wkr) = ptext (sLit "Worker(lcl):") <+> ppr wkr
<+> parens (ptext (sLit "arity") <+> int a)
ppr (IfExtWrapper a wkr) = ptext (sLit "Worker(ext0:") <+> ppr wkr
<+> brackets (pprWithCommas ppr ns)
-- -----------------------------------------------------------------------------
- -- Finding the Names in IfaceSyn
+ -- | Finding the Names in IfaceSyn
-- This is used for dependency analysis in MkIface, so that we
-- fingerprint a declaration before the things that depend on it. It
-- fingerprinting the instance, so DFuns are not dependencies.
freeNamesIfDecl :: IfaceDecl -> NameSet
- freeNamesIfDecl (IfaceId _s t d i) =
+ freeNamesIfDecl (IfaceId _s t d i) =
freeNamesIfType t &&&
freeNamesIfIdInfo i &&&
freeNamesIfIdDetails d
- freeNamesIfDecl IfaceForeign{} =
+ freeNamesIfDecl IfaceForeign{} =
emptyNameSet
freeNamesIfDecl d@IfaceData{} =
freeNamesIfTvBndrs (ifTyVars d) &&&
freeNamesIfSynRhs Nothing = emptyNameSet
freeNamesIfTcFam :: Maybe (IfaceTyCon, [IfaceType]) -> NameSet
- freeNamesIfTcFam (Just (tc,tys)) =
+ freeNamesIfTcFam (Just (tc,tys)) =
freeNamesIfTc tc &&& fnList freeNamesIfType tys
freeNamesIfTcFam Nothing =
emptyNameSet
freeNamesIfConDecls _ = emptyNameSet
freeNamesIfConDecl :: IfaceConDecl -> NameSet
- freeNamesIfConDecl c =
+ freeNamesIfConDecl c =
freeNamesIfTvBndrs (ifConUnivTvs c) &&&
freeNamesIfTvBndrs (ifConExTvs c) &&&
- freeNamesIfContext (ifConCtxt c) &&&
+ freeNamesIfContext (ifConCtxt c) &&&
fnList freeNamesIfType (ifConArgTys c) &&&
fnList freeNamesIfType (map snd (ifConEqSpec c)) -- equality constraints
freeNamesIfPredType :: IfacePredType -> NameSet
- freeNamesIfPredType (IfaceClassP cl tys) =
+ freeNamesIfPredType (IfaceClassP cl tys) =
unitNameSet cl &&& fnList freeNamesIfType tys
freeNamesIfPredType (IfaceIParam _n ty) =
freeNamesIfType ty
freeNamesIfType (IfaceTyVar _) = emptyNameSet
freeNamesIfType (IfaceAppTy s t) = freeNamesIfType s &&& freeNamesIfType t
freeNamesIfType (IfacePredTy st) = freeNamesIfPredType st
- freeNamesIfType (IfaceTyConApp tc ts) =
+ freeNamesIfType (IfaceTyConApp tc ts) =
freeNamesIfTc tc &&& fnList freeNamesIfType ts
freeNamesIfType (IfaceForAllTy tv t) =
freeNamesIfTvBndr tv &&& freeNamesIfType t
freeNamesIfType (IfaceFunTy s t) = freeNamesIfType s &&& freeNamesIfType t
+freeNamesIfType (IfaceCoConApp tc ts) =
+ freeNamesIfCo tc &&& fnList freeNamesIfType ts
freeNamesIfTvBndrs :: [IfaceTvBndr] -> NameSet
freeNamesIfTvBndrs = fnList freeNamesIfTvBndr
freeNamesIfLetBndr :: IfaceLetBndr -> NameSet
-- Remember IfaceLetBndr is used only for *nested* bindings
- -- The IdInfo can contain an unfolding (in the case of
+ -- The IdInfo can contain an unfolding (in the case of
-- local INLINE pragmas), so look there too
freeNamesIfLetBndr (IfLetBndr _name ty info) = freeNamesIfType ty
&&& freeNamesIfIdInfo info
freeNamesIfIdBndr = freeNamesIfTvBndr
freeNamesIfIdInfo :: IfaceIdInfo -> NameSet
- freeNamesIfIdInfo NoInfo = emptyNameSet
+ freeNamesIfIdInfo NoInfo = emptyNameSet
freeNamesIfIdInfo (HasInfo i) = fnList freeNamesItem i
freeNamesItem :: IfaceInfoItem -> NameSet
freeNamesIfUnfold (IfDFunUnfold vs) = fnList freeNamesIfExpr (dfunArgExprs vs)
freeNamesIfExpr :: IfaceExpr -> NameSet
- freeNamesIfExpr (IfaceExt v) = unitNameSet v
+ freeNamesIfExpr (IfaceExt v) = unitNameSet v
freeNamesIfExpr (IfaceFCall _ ty) = freeNamesIfType ty
freeNamesIfExpr (IfaceType ty) = freeNamesIfType ty
+freeNamesIfExpr (IfaceCo co) = freeNamesIfType co
freeNamesIfExpr (IfaceTuple _ as) = fnList freeNamesIfExpr as
freeNamesIfExpr (IfaceLam b body) = freeNamesIfBndr b &&& freeNamesIfExpr body
freeNamesIfExpr (IfaceApp f a) = freeNamesIfExpr f &&& freeNamesIfExpr a
freeNamesIfExpr (IfaceCast e co) = freeNamesIfExpr e &&& freeNamesIfType co
- freeNamesIfExpr (IfaceNote _n r) = freeNamesIfExpr r
+ freeNamesIfExpr (IfaceNote _n r) = freeNamesIfExpr r
-freeNamesIfExpr (IfaceCase s _ ty alts)
- = freeNamesIfExpr s
+freeNamesIfExpr (IfaceCase s _ alts)
+ = freeNamesIfExpr s
&&& fnList fn_alt alts &&& fn_cons alts
- &&& freeNamesIfType ty
where
fn_alt (_con,_bs,r) = freeNamesIfExpr r
-- Depend on the data constructors. Just one will do!
-- Note [Tracking data constructors]
- fn_cons [] = emptyNameSet
- fn_cons ((IfaceDefault ,_,_) : alts) = fn_cons alts
- fn_cons ((IfaceDataAlt con,_,_) : _ ) = unitNameSet con
- fn_cons (_ : _ ) = emptyNameSet
+ fn_cons [] = emptyNameSet
+ fn_cons ((IfaceDefault ,_,_) : xs) = fn_cons xs
+ fn_cons ((IfaceDataAlt con,_,_) : _ ) = unitNameSet con
+ fn_cons (_ : _ ) = emptyNameSet
freeNamesIfExpr (IfaceLet (IfaceNonRec bndr rhs) body)
= freeNamesIfLetBndr bndr &&& freeNamesIfExpr rhs &&& freeNamesIfExpr body
-- ToDo: shouldn't we include IfaceIntTc & co.?
freeNamesIfTc _ = emptyNameSet
+freeNamesIfCo :: IfaceCoCon -> NameSet
+freeNamesIfCo (IfaceCoAx tc) = unitNameSet tc
+freeNamesIfCo _ = emptyNameSet
+
freeNamesIfRule :: IfaceRule -> NameSet
freeNamesIfRule (IfaceRule { ifRuleBndrs = bs, ifRuleHead = f
, ifRuleArgs = es, ifRuleRhs = rhs })
Note [Tracking data constructors]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- In a case expression
+ In a case expression
case e of { C a -> ...; ... }
You might think that we don't need to include the datacon C
- in the free names, because its type will probably show up in
+ in the free names, because its type will probably show up in
the free names of 'e'. But in rare circumstances this may
not happen. Here's the one that bit me:
- module DynFlags where
+ module DynFlags where
import {-# SOURCE #-} Packages( PackageState )
data DynFlags = DF ... PackageState ...
- module Packages where
+ module Packages where
import DynFlags
data PackageState = PS ...
lookupModule (df :: DynFlags)
Now, lookupModule depends on DynFlags, but the transitive dependency
on the *locally-defined* type PackageState is not visible. We need
to take account of the use of the data constructor PS in the pattern match.
+
#include "HsVersions.h"
- #ifndef OMIT_NATIVE_CODEGEN
import Platform
- #endif
import Module
import PackageConfig
import PrelNames ( mAIN )
import Data.List
import Data.Map (Map)
import qualified Data.Map as Map
- -- import Data.Maybe
+ import Distribution.System
import System.FilePath
import System.IO ( stderr, hPutChar )
| Opt_KindSignatures
| Opt_ParallelListComp
| Opt_TransformListComp
+ | Opt_MonadComprehensions
| Opt_GeneralizedNewtypeDeriving
| Opt_RecursiveDo
| Opt_DoRec
floatLamArgs :: Maybe Int, -- ^ Arg count for lambda floating
-- See CoreMonad.FloatOutSwitches
- #ifndef OMIT_NATIVE_CODEGEN
- targetPlatform :: Platform, -- ^ The platform we're compiling for. Used by the NCG.
- #endif
+ targetPlatform :: Platform.Platform, -- ^ The platform we're compiling for. Used by the NCG.
cmdlineHcIncludes :: [String], -- ^ @\-\#includes@
importPaths :: [FilePath],
mainModIs :: Module,
| HscNothing -- ^ Don't generate any code. See notes above.
deriving (Eq, Show)
+ showHscTargetFlag :: HscTarget -> String
+ showHscTargetFlag HscC = "-fvia-c"
+ showHscTargetFlag HscAsm = "-fasm"
+ showHscTargetFlag HscLlvm = "-fllvm"
+ showHscTargetFlag HscJava = panic "No flag for HscJava"
+ showHscTargetFlag HscInterpreted = "-fbyte-code"
+ showHscTargetFlag HscNothing = "-fno-code"
+
-- | Will this target result in an object file on the disk?
isObjectTarget :: HscTarget -> Bool
isObjectTarget HscC = True
-- object files on the current platform.
defaultObjectTarget :: HscTarget
defaultObjectTarget
+ | cGhcUnregisterised == "YES" = HscC
| cGhcWithNativeCodeGen == "YES" = HscAsm
- | otherwise = HscC
+ | otherwise = HscLlvm
data DynLibLoader
= Deployable
floatLamArgs = Just 0, -- Default: float only if no fvs
strictnessBefore = [],
- #ifndef OMIT_NATIVE_CODEGEN
targetPlatform = defaultTargetPlatform,
- #endif
cmdlineHcIncludes = [],
importPaths = ["."],
mainModIs = mAIN,
SevOutput -> printOutput (msg style)
SevInfo -> printErrs (msg style)
SevFatal -> printErrs (msg style)
- _ -> do
+ _ -> do
hPutChar stderr '\n'
printErrs ((mkLocMessage srcSpan msg) style)
-- careful (#2302): printErrs prints in UTF-8, whereas
when (not (null errs)) $ ghcError $ errorsToGhcException errs
let (pic_warns, dflags2)
- #if !(x86_64_TARGET_ARCH && linux_TARGET_OS)
- | (not opt_Static || opt_PIC) && hscTarget dflags1 == HscLlvm
- = ([L noSrcSpan $ "Warning: -fllvm is incompatible with -fPIC and -"
- ++ "dynamic on this platform;\n ignoring -fllvm"],
- dflags1{ hscTarget = HscAsm })
- #endif
+ | not (cTargetArch == X86_64 && (cTargetOS == Linux || cTargetOS == OSX)) &&
+ (not opt_Static || opt_PIC) &&
+ hscTarget dflags1 == HscLlvm
+ = ([L noSrcSpan $ "Warning: -fllvm is incompatible with -fPIC and "
+ ++ "-dynamic on this platform;\n"
+ ++ " using "
+ ++ showHscTargetFlag defaultObjectTarget ++ " instead"],
+ dflags1{ hscTarget = defaultObjectTarget })
| otherwise = ([], dflags1)
return (dflags2, leftover, pic_warns ++ warns)
, Flag "w" (NoArg (mapM_ unSetDynFlag minuswRemovesOpts))
------ Optimisation flags ------------------------------------------
- , Flag "O" (noArg (setOptLevel 1))
- , Flag "Onot" (noArgDF (setOptLevel 0) "Use -O0 instead")
- , Flag "Odph" (noArg setDPHOpt)
- , Flag "O" (OptIntSuffix (\mb_n -> upd (setOptLevel (mb_n `orElse` 1))))
+ , Flag "O" (noArgM (setOptLevel 1))
+ , Flag "Onot" (noArgM (\dflags -> do deprecate "Use -O0 instead"
+ setOptLevel 0 dflags))
+ , Flag "Odph" (noArgM setDPHOpt)
+ , Flag "O" (optIntSuffixM (\mb_n -> setOptLevel (mb_n `orElse` 1)))
-- If the number is missing, use 1
, Flag "fsimplifier-phases" (intSuffix (\n d -> d{ simplPhases = n }))
( "EmptyDataDecls", Opt_EmptyDataDecls, nop ),
( "ParallelListComp", Opt_ParallelListComp, nop ),
( "TransformListComp", Opt_TransformListComp, nop ),
+ ( "MonadComprehensions", Opt_MonadComprehensions, nop),
( "ForeignFunctionInterface", Opt_ForeignFunctionInterface, nop ),
( "UnliftedFFITypes", Opt_UnliftedFFITypes, nop ),
( "GHCForeignImportPrim", Opt_GHCForeignImportPrim, nop ),
( "RankNTypes", Opt_RankNTypes, nop ),
( "ImpredicativeTypes", Opt_ImpredicativeTypes, nop),
( "TypeOperators", Opt_TypeOperators, nop ),
- ( "RecursiveDo", Opt_RecursiveDo,
+ ( "RecursiveDo", Opt_RecursiveDo, -- Enables 'mdo'
deprecatedForExtension "DoRec"),
- ( "DoRec", Opt_DoRec, nop ),
+ ( "DoRec", Opt_DoRec, nop ), -- Enables 'rec' keyword
( "Arrows", Opt_Arrows, nop ),
( "ParallelArrays", Opt_ParallelArrays, nop ),
( "TemplateHaskell", Opt_TemplateHaskell, checkTemplateHaskellOk ),
type DynP = EwM (CmdLineP DynFlags)
upd :: (DynFlags -> DynFlags) -> DynP ()
- upd f = liftEwM (do { dfs <- getCmdLineState
- ; putCmdLineState $! (f dfs) })
+ upd f = liftEwM (do dflags <- getCmdLineState
+ putCmdLineState $! f dflags)
+
+ updM :: (DynFlags -> DynP DynFlags) -> DynP ()
+ updM f = do dflags <- liftEwM getCmdLineState
+ dflags' <- f dflags
+ liftEwM $ putCmdLineState $! dflags'
--------------- Constructor functions for OptKind -----------------
noArg :: (DynFlags -> DynFlags) -> OptKind (CmdLineP DynFlags)
noArg fn = NoArg (upd fn)
+ noArgM :: (DynFlags -> DynP DynFlags) -> OptKind (CmdLineP DynFlags)
+ noArgM fn = NoArg (updM fn)
+
noArgDF :: (DynFlags -> DynFlags) -> String -> OptKind (CmdLineP DynFlags)
noArgDF fn deprec = NoArg (upd fn >> deprecate deprec)
intSuffix :: (Int -> DynFlags -> DynFlags) -> OptKind (CmdLineP DynFlags)
intSuffix fn = IntSuffix (\n -> upd (fn n))
+ optIntSuffixM :: (Maybe Int -> DynFlags -> DynP DynFlags)
+ -> OptKind (CmdLineP DynFlags)
+ optIntSuffixM fn = OptIntSuffix (\mi -> updM (fn mi))
+
setDumpFlag :: DynFlag -> OptKind (CmdLineP DynFlags)
setDumpFlag dump_flag = NoArg (setDumpFlag' dump_flag)
-- recompiled which probably isn't what you want
forceRecompile = do { dfs <- liftEwM getCmdLineState
; when (force_recomp dfs) (setDynFlag Opt_ForceRecomp) }
- where
+ where
force_recomp dfs = isOneShot (ghcMode dfs)
setVerboseCore2Core :: DynP ()
setVerboseCore2Core = do forceRecompile
setDynFlag Opt_D_verbose_core2core
upd (\dfs -> dfs { shouldDumpSimplPhase = Nothing })
-
setDumpSimplPhases :: String -> DynP ()
setDumpSimplPhases s = do forceRecompile
-- not from bytecode to object-code. The idea is that -fasm/-fllvm
-- can be safely used in an OPTIONS_GHC pragma.
setObjTarget :: HscTarget -> DynP ()
- setObjTarget l = upd set
+ setObjTarget l = updM set
where
- set dfs
- | isObjectTarget (hscTarget dfs) = dfs { hscTarget = l }
- | otherwise = dfs
-
- setOptLevel :: Int -> DynFlags -> DynFlags
+ set dflags
+ | isObjectTarget (hscTarget dflags)
+ = case l of
+ HscC
+ | cGhcUnregisterised /= "YES" ->
+ do addWarn ("Compiler not unregisterised, so ignoring " ++
+ showHscTargetFlag l)
+ return dflags
+ HscAsm
+ | cGhcWithNativeCodeGen /= "YES" ->
+ do addWarn ("Compiler has no native codegen, so ignoring " ++
+ showHscTargetFlag l)
+ return dflags
+ HscLlvm
+ | cGhcUnregisterised == "YES" ->
+ do addWarn ("Compiler unregisterised, so ignoring " ++
+ showHscTargetFlag l)
+ return dflags
+ _ -> return $ dflags { hscTarget = l }
+ | otherwise = return dflags
+
+ setOptLevel :: Int -> DynFlags -> DynP DynFlags
setOptLevel n dflags
| hscTarget dflags == HscInterpreted && n > 0
- = dflags
- -- not in IO any more, oh well:
- -- putStr "warning: -O conflicts with --interactive; -O ignored.\n"
+ = do addWarn "-O conflicts with --interactive; -O ignored."
+ return dflags
| otherwise
- = updOptLevel n dflags
+ = return (updOptLevel n dflags)
-- -Odph is equivalent to
-- -fmax-simplifier-iterations20 this is necessary sometimes
-- -fsimplifier-phases=3 we use an additional simplifier phase for fusion
--
- setDPHOpt :: DynFlags -> DynFlags
+ setDPHOpt :: DynFlags -> DynP DynFlags
setDPHOpt dflags = setOptLevel 2 (dflags { maxSimplIterations = 20
, simplPhases = 3
})
addImportPath "" = upd (\s -> s{importPaths = []})
addImportPath p = upd (\s -> s{importPaths = importPaths s ++ splitPathList p})
-
addLibraryPath p =
upd (\s -> s{libraryPaths = libraryPaths s ++ splitPathList p})
-- Monad stuff
thenIOName, bindIOName, returnIOName, failIOName,
failMName, bindMName, thenMName, returnMName,
+ fmapName,
-- MonadRec stuff
mfixName,
-- dotnet interop
, objectTyConName, marshalObjectName, unmarshalObjectName
, marshalStringName, unmarshalStringName, checkDotnetResName
+
+ -- Monad comprehensions
+ , guardMName
+ , liftMName
+ , groupMName
+ , mzipName
]
genericTyConNames :: [Name]
gHC_PACK, gHC_CONC, gHC_IO, gHC_IO_Exception,
gHC_ST, gHC_ARR, gHC_STABLE, gHC_ADDR, gHC_PTR, gHC_ERR, gHC_REAL,
gHC_FLOAT, gHC_TOP_HANDLER, sYSTEM_IO, dYNAMIC, tYPEABLE, gENERICS,
- dOTNET, rEAD_PREC, lEX, gHC_INT, gHC_WORD, mONAD, mONAD_FIX, aRROW, cONTROL_APPLICATIVE,
- gHC_DESUGAR, rANDOM, gHC_EXTS, cONTROL_EXCEPTION_BASE :: Module
+ dOTNET, rEAD_PREC, lEX, gHC_INT, gHC_WORD, mONAD, mONAD_FIX, mONAD_GROUP, mONAD_ZIP,
+ aRROW, cONTROL_APPLICATIVE, gHC_DESUGAR, rANDOM, gHC_EXTS,
+ cONTROL_EXCEPTION_BASE :: Module
gHC_PRIM = mkPrimModule (fsLit "GHC.Prim") -- Primitive types and values
gHC_TYPES = mkPrimModule (fsLit "GHC.Types")
gHC_WORD = mkBaseModule (fsLit "GHC.Word")
mONAD = mkBaseModule (fsLit "Control.Monad")
mONAD_FIX = mkBaseModule (fsLit "Control.Monad.Fix")
+ mONAD_GROUP = mkBaseModule (fsLit "Control.Monad.Group")
+ mONAD_ZIP = mkBaseModule (fsLit "Control.Monad.Zip")
aRROW = mkBaseModule (fsLit "Control.Arrow")
cONTROL_APPLICATIVE = mkBaseModule (fsLit "Control.Applicative")
gHC_DESUGAR = mkBaseModule (fsLit "GHC.Desugar")
inlineIdName = varQual gHC_MAGIC (fsLit "inline") inlineIdKey
-- Base classes (Eq, Ord, Functor)
- eqClassName, eqName, ordClassName, geName, functorClassName :: Name
+ fmapName, eqClassName, eqName, ordClassName, geName, functorClassName :: Name
eqClassName = clsQual gHC_CLASSES (fsLit "Eq") eqClassKey
eqName = methName gHC_CLASSES (fsLit "==") eqClassOpKey
ordClassName = clsQual gHC_CLASSES (fsLit "Ord") ordClassKey
geName = methName gHC_CLASSES (fsLit ">=") geClassOpKey
functorClassName = clsQual gHC_BASE (fsLit "Functor") functorClassKey
+ fmapName = methName gHC_BASE (fsLit "fmap") fmapClassOpKey
-- Class Monad
monadClassName, thenMName, bindMName, returnMName, failMName :: Name
choiceAName = varQual aRROW (fsLit "|||") choiceAIdKey
loopAName = varQual aRROW (fsLit "loop") loopAIdKey
+ -- Monad comprehensions
+ guardMName, liftMName, groupMName, mzipName :: Name
+ guardMName = varQual mONAD (fsLit "guard") guardMIdKey
+ liftMName = varQual mONAD (fsLit "liftM") liftMIdKey
+ groupMName = varQual mONAD_GROUP (fsLit "mgroupWith") groupMIdKey
+ mzipName = varQual mONAD_ZIP (fsLit "mzip") mzipIdKey
+
+
-- Annotation type checking
toAnnotationWrapperName :: Name
toAnnotationWrapperName = varQual gHC_DESUGAR (fsLit "toAnnotationWrapper") toAnnotationWrapperIdKey
word32PrimTyConKey, word32TyConKey, word64PrimTyConKey, word64TyConKey,
liftedConKey, unliftedConKey, anyBoxConKey, kindConKey, boxityConKey,
typeConKey, threadIdPrimTyConKey, bcoPrimTyConKey, ptrTyConKey,
- funPtrTyConKey, tVarPrimTyConKey :: Unique
+ funPtrTyConKey, tVarPrimTyConKey, eqPredPrimTyConKey :: Unique
statePrimTyConKey = mkPreludeTyConUnique 50
stableNamePrimTyConKey = mkPreludeTyConUnique 51
-stableNameTyConKey = mkPreludeTyConUnique 52
-mutVarPrimTyConKey = mkPreludeTyConUnique 55
+stableNameTyConKey = mkPreludeTyConUnique 52
+eqPredPrimTyConKey = mkPreludeTyConUnique 53
+mutVarPrimTyConKey = mkPreludeTyConUnique 55
ioTyConKey = mkPreludeTyConUnique 56
wordPrimTyConKey = mkPreludeTyConUnique 58
wordTyConKey = mkPreludeTyConUnique 59
eitherTyConKey = mkPreludeTyConUnique 84
-- Super Kinds constructors
-tySuperKindTyConKey, coSuperKindTyConKey :: Unique
+tySuperKindTyConKey :: Unique
tySuperKindTyConKey = mkPreludeTyConUnique 85
-coSuperKindTyConKey = mkPreludeTyConUnique 86
-- Kind constructors
liftedTypeKindTyConKey, openTypeKindTyConKey, unliftedTypeKindTyConKey,
groupWithIdKey = mkPreludeMiscIdUnique 70
dollarIdKey = mkPreludeMiscIdUnique 71
+coercionTokenIdKey :: Unique
+coercionTokenIdKey = mkPreludeMiscIdUnique 72
+
-- Parallel array functions
singletonPIdKey, nullPIdKey, lengthPIdKey, replicatePIdKey, mapPIdKey,
filterPIdKey, zipPIdKey, crossMapPIdKey, indexPIdKey, toPIdKey,
fromIntegerClassOpKey, minusClassOpKey, fromRationalClassOpKey,
enumFromClassOpKey, enumFromThenClassOpKey, enumFromToClassOpKey,
enumFromThenToClassOpKey, eqClassOpKey, geClassOpKey, negateClassOpKey,
- failMClassOpKey, bindMClassOpKey, thenMClassOpKey, returnMClassOpKey
+ failMClassOpKey, bindMClassOpKey, thenMClassOpKey, returnMClassOpKey,
+ fmapClassOpKey
:: Unique
fromIntegerClassOpKey = mkPreludeMiscIdUnique 102
minusClassOpKey = mkPreludeMiscIdUnique 103
failMClassOpKey = mkPreludeMiscIdUnique 112
bindMClassOpKey = mkPreludeMiscIdUnique 113 -- (>>=)
thenMClassOpKey = mkPreludeMiscIdUnique 114 -- (>>)
+ fmapClassOpKey = mkPreludeMiscIdUnique 115
returnMClassOpKey = mkPreludeMiscIdUnique 117
-- Recursive do notation
toIntegerClassOpKey = mkPreludeMiscIdUnique 129
toRationalClassOpKey = mkPreludeMiscIdUnique 130
+ -- Monad comprehensions
+ guardMIdKey, liftMIdKey, groupMIdKey, mzipIdKey :: Unique
+ guardMIdKey = mkPreludeMiscIdUnique 131
+ liftMIdKey = mkPreludeMiscIdUnique 132
+ groupMIdKey = mkPreludeMiscIdUnique 133
+ mzipIdKey = mkPreludeMiscIdUnique 134
+
+
---------------- Template Haskell -------------------
-- USES IdUniques 200-499
-----------------------------------------------------
rnBind _ trim (L loc bind@(PatBind { pat_lhs = pat
, pat_rhs = grhss
-- pat fvs were stored in bind_fvs
- -- after processing the LHS
+ -- after processing the LHS
, bind_fvs = pat_fvs }))
= setSrcSpan loc $
do { let bndrs = collectPatBinders pat
, fun_infix = is_infix
, fun_matches = matches }))
-- invariant: no free vars here when it's a FunBind
- = setSrcSpan loc $
+ = setSrcSpan loc $
do { let plain_name = unLoc name
; (matches', fvs) <- bindSigTyVarsFV (sig_fn plain_name) $
-- Standard Haskell 1.4 guards are just a single boolean
-- expression, rather than a list of qualifiers as in the
-- Glasgow extension
- is_standard_guard [] = True
- is_standard_guard [L _ (ExprStmt _ _ _)] = True
- is_standard_guard _ = False
+ is_standard_guard [] = True
+ is_standard_guard [L _ (ExprStmt _ _ _ _)] = True
+ is_standard_guard _ = False
\end{code}
%************************************************************************
\begin{code}
module TcArrows ( tcProc ) where
- import {-# SOURCE #-} TcExpr( tcMonoExpr, tcInferRho, tcSyntaxOp )
+ import {-# SOURCE #-} TcExpr( tcMonoExpr, tcInferRho, tcSyntaxOp, tcCheckId )
import HsSyn
import TcMatches
import TcPat
import TcUnify
import TcRnMonad
+ import TcEnv
import Coercion
+ import Id( mkLocalId )
import Inst
import Name
import TysWiredIn
\begin{code}
tcProc :: InPat Name -> LHsCmdTop Name -- proc pat -> expr
-> TcRhoType -- Expected type of whole proc expression
- -> TcM (OutPat TcId, LHsCmdTop TcId, CoercionI)
+ -> TcM (OutPat TcId, LHsCmdTop TcId, Coercion)
tcProc pat cmd exp_ty
= newArrowScope $
do { (coi, (exp_ty1, res_ty)) <- matchExpectedAppTy exp_ty
; (coi1, (arr_ty, arg_ty)) <- matchExpectedAppTy exp_ty1
; let cmd_env = CmdEnv { cmd_arr = arr_ty }
- ; (pat', cmd') <- tcPat ProcExpr pat arg_ty $
+ ; (pat', cmd') <- tcPat ProcExpr pat arg_ty $
tcCmdTop cmd_env cmd [] res_ty
- ; let res_coi = mkTransCoI coi (mkAppTyCoI coi1 (IdCo res_ty))
- ; return (pat', cmd', res_coi) }
+ ; let res_coi = mkTransCo coi (mkAppCo coi1 (mkReflCo res_ty))
+ ; return (pat', cmd', res_coi) }
\end{code}
tcCmdTop env (L loc (HsCmdTop cmd _ _ names)) cmd_stk res_ty
= setSrcSpan loc $
- do { cmd' <- tcGuardedCmd env cmd cmd_stk res_ty
+ do { cmd' <- tcCmd env cmd (cmd_stk, res_ty)
; names' <- mapM (tcSyntaxName ProcOrigin (cmd_arr env)) names
; return (L loc $ HsCmdTop cmd' cmd_stk res_ty names') }
----------------------------------------
- tcGuardedCmd :: CmdEnv -> LHsExpr Name -> CmdStack
- -> TcTauType -> TcM (LHsExpr TcId)
- -- A wrapper that deals with the refinement (if any)
- tcGuardedCmd env expr stk res_ty
- = do { body <- tcCmd env expr (stk, res_ty)
- ; return body
- }
-
tcCmd :: CmdEnv -> LHsExpr Name -> (CmdStack, TcTauType) -> TcM (LHsExpr TcId)
-- The main recursive function
tcCmd env (L loc expr) res_ty
where
match_ctxt = MC { mc_what = CaseAlt,
mc_body = mc_body }
- mc_body body res_ty' = tcGuardedCmd env body stk res_ty'
+ mc_body body res_ty' = tcCmd env body (stk, res_ty')
tc_cmd env (HsIf mb_fun pred b1 b2) (stack_ty,res_ty)
= do { pred_ty <- newFlexiTyVarTy openTypeKind
-- Check the patterns, and the GRHSs inside
; (pats', grhss') <- setSrcSpan mtch_loc $
- tcPats LambdaExpr pats cmd_stk $
- tc_grhss grhss res_ty
+ tcPats LambdaExpr pats cmd_stk $
+ tc_grhss grhss res_ty
; let match' = L mtch_loc (Match pats' Nothing grhss')
; return (HsLam (MatchGroup [match'] res_ty))
; return (GRHSs grhss' binds') }
tc_grhs res_ty (GRHS guards body)
- = do { (guards', rhs') <- tcStmts pg_ctxt tcGuardStmt guards res_ty $
- tcGuardedCmd env body stk'
+ = do { (guards', rhs') <- tcStmtsAndThen pg_ctxt tcGuardStmt guards res_ty $
+ \ res_ty -> tcCmd env body (stk', res_ty)
; return (GRHS guards' rhs') }
-------------------------------------------
-- Do notation
- tc_cmd env cmd@(HsDo do_or_lc stmts body _ty) (cmd_stk, res_ty)
+ tc_cmd env cmd@(HsDo do_or_lc stmts _) (cmd_stk, res_ty)
= do { checkTc (null cmd_stk) (nonEmptyCmdStkErr cmd)
- ; (stmts', body') <- tcStmts do_or_lc (tcMDoStmt tc_rhs) stmts res_ty $
- tcGuardedCmd env body []
- ; return (HsDo do_or_lc stmts' body' res_ty) }
+ ; stmts' <- tcStmts do_or_lc (tcArrDoStmt env) stmts res_ty
+ ; return (HsDo do_or_lc stmts' res_ty) }
where
- tc_rhs rhs = do { ty <- newFlexiTyVarTy liftedTypeKind
- ; rhs' <- tcCmd env rhs ([], ty)
- ; return (rhs', ty) }
-----------------------------------------------------------------
e_res_ty
-- Check expr
- ; (inst_binds, expr') <- checkConstraints ArrowSkol [w_tv] [] $
+ ; (inst_binds, expr') <- checkConstraints ArrowSkol [w_tv] [] $
escapeArrowScope (tcMonoExpr expr e_ty)
-- OK, now we are in a position to unscramble
-- Check that it has the right shape:
-- ((w,s1) .. sn)
-- where the si do not mention w
- ; checkTc (corner_ty `tcEqType` mkTyVarTy w_tv &&
+ ; checkTc (corner_ty `eqType` mkTyVarTy w_tv &&
not (w_tv `elemVarSet` tyVarsOfTypes arg_tys))
(badFormFun i tup_ty')
%************************************************************************
%* *
+ Stmts
+ %* *
+ %************************************************************************
+
+ \begin{code}
+ --------------------------------
+ -- Mdo-notation
+ -- The distinctive features here are
+ -- (a) RecStmts, and
+ -- (b) no rebindable syntax
+
+ tcArrDoStmt :: CmdEnv -> TcStmtChecker
+ tcArrDoStmt env _ (LastStmt rhs _) res_ty thing_inside
+ = do { rhs' <- tcCmd env rhs ([], res_ty)
+ ; thing <- thing_inside (panic "tcArrDoStmt")
+ ; return (LastStmt rhs' noSyntaxExpr, thing) }
+
+ tcArrDoStmt env _ (ExprStmt rhs _ _ _) res_ty thing_inside
+ = do { (rhs', elt_ty) <- tc_arr_rhs env rhs
+ ; thing <- thing_inside res_ty
+ ; return (ExprStmt rhs' noSyntaxExpr noSyntaxExpr elt_ty, thing) }
+
+ tcArrDoStmt env ctxt (BindStmt pat rhs _ _) res_ty thing_inside
+ = do { (rhs', pat_ty) <- tc_arr_rhs env rhs
+ ; (pat', thing) <- tcPat (StmtCtxt ctxt) pat pat_ty $
+ thing_inside res_ty
+ ; return (BindStmt pat' rhs' noSyntaxExpr noSyntaxExpr, thing) }
+
+ tcArrDoStmt env ctxt (RecStmt { recS_stmts = stmts, recS_later_ids = laterNames
+ , recS_rec_ids = recNames }) res_ty thing_inside
+ = do { rec_tys <- newFlexiTyVarTys (length recNames) liftedTypeKind
+ ; let rec_ids = zipWith mkLocalId recNames rec_tys
+ ; tcExtendIdEnv rec_ids $ do
+ { (stmts', (later_ids, rec_rets))
+ <- tcStmtsAndThen ctxt (tcArrDoStmt env) stmts res_ty $ \ _res_ty' ->
+ -- ToDo: res_ty not really right
+ do { rec_rets <- zipWithM tcCheckId recNames rec_tys
+ ; later_ids <- tcLookupLocalIds laterNames
+ ; return (later_ids, rec_rets) }
+
+ ; thing <- tcExtendIdEnv later_ids (thing_inside res_ty)
+ -- NB: The rec_ids for the recursive things
+ -- already scope over this part. This binding may shadow
+ -- some of them with polymorphic things with the same Name
+ -- (see note [RecStmt] in HsExpr)
+
+ ; return (emptyRecStmt { recS_stmts = stmts', recS_later_ids = later_ids
+ , recS_rec_ids = rec_ids, recS_rec_rets = rec_rets
+ , recS_ret_ty = res_ty }, thing)
+ }}
+
+ tcArrDoStmt _ _ stmt _ _
+ = pprPanic "tcArrDoStmt: unexpected Stmt" (ppr stmt)
+
+ tc_arr_rhs :: CmdEnv -> LHsExpr Name -> TcM (LHsExpr TcId, TcType)
+ tc_arr_rhs env rhs = do { ty <- newFlexiTyVarTy liftedTypeKind
+ ; rhs' <- tcCmd env rhs ([], ty)
+ ; return (rhs', ty) }
+ \end{code}
+
+
+ %************************************************************************
+ %* *
Helpers
%* *
%************************************************************************
import Coercion
import Var
import VarSet
+ import VarEnv
import TysWiredIn
import TysPrim( intPrimTy )
import PrimOp( tagToEnumKey )
import Util
import ListSetOps
import Maybes
+ import ErrUtils
import Outputable
import FastString
import Control.Monad
; co_res <- unifyType op_res_ty res_ty
; op_id <- tcLookupId op_name
; let op' = L loc (HsWrap (mkWpTyApps [arg2_ty, op_res_ty]) (HsVar op_id))
- ; return $ mkHsWrapCoI co_res $
- OpApp (mkLHsWrapCoI co_arg1 arg1') op' fix arg2' }
+ ; return $ mkHsWrapCo co_res $
+ OpApp (mkLHsWrapCo co_arg1 arg1') op' fix arg2' }
| otherwise
= do { traceTc "Non Application rule" (ppr op)
; (co_fn, arg_tys, op_res_ty) <- unifyOpFunTys op 2 op_ty
; co_res <- unifyType op_res_ty res_ty
; [arg1', arg2'] <- tcArgs op [arg1, arg2] arg_tys
- ; return $ mkHsWrapCoI co_res $
- OpApp arg1' (mkLHsWrapCoI co_fn op') fix arg2' }
+ ; return $ mkHsWrapCo co_res $
+ OpApp arg1' (mkLHsWrapCo co_fn op') fix arg2' }
-- Right sections, equivalent to \ x -> x `op` expr, or
-- \ x -> op x expr
; (co_fn, [arg1_ty, arg2_ty], op_res_ty) <- unifyOpFunTys op 2 op_ty
; co_res <- unifyType (mkFunTy arg1_ty op_res_ty) res_ty
; arg2' <- tcArg op (arg2, arg2_ty, 2)
- ; return $ mkHsWrapCoI co_res $
- SectionR (mkLHsWrapCoI co_fn op') arg2' }
+ ; return $ mkHsWrapCo co_res $
+ SectionR (mkLHsWrapCo co_fn op') arg2' }
tcExpr (SectionL arg1 op) res_ty
= do { (op', op_ty) <- tcInferFun op
; (co_fn, (arg1_ty:arg_tys), op_res_ty) <- unifyOpFunTys op n_reqd_args op_ty
; co_res <- unifyType (mkFunTys arg_tys op_res_ty) res_ty
; arg1' <- tcArg op (arg1, arg1_ty, 1)
- ; return $ mkHsWrapCoI co_res $
- SectionL arg1' (mkLHsWrapCoI co_fn op') }
+ ; return $ mkHsWrapCo co_res $
+ SectionL arg1' (mkLHsWrapCo co_fn op') }
tcExpr (ExplicitTuple tup_args boxity) res_ty
| all tupArgPresent tup_args
= do { let tup_tc = tupleTyCon boxity (length tup_args)
; (coi, arg_tys) <- matchExpectedTyConApp tup_tc res_ty
; tup_args1 <- tcTupArgs tup_args arg_tys
- ; return $ mkHsWrapCoI coi (ExplicitTuple tup_args1 boxity) }
+ ; return $ mkHsWrapCo coi (ExplicitTuple tup_args1 boxity) }
| otherwise
= -- The tup_args are a mixture of Present and Missing (for tuple sections)
-- Handle tuple sections where
; tup_args1 <- tcTupArgs tup_args arg_tys
- ; return $ mkHsWrapCoI coi (ExplicitTuple tup_args1 boxity) }
+ ; return $ mkHsWrapCo coi (ExplicitTuple tup_args1 boxity) }
tcExpr (ExplicitList _ exprs) res_ty
= do { (coi, elt_ty) <- matchExpectedListTy res_ty
; exprs' <- mapM (tc_elt elt_ty) exprs
- ; return $ mkHsWrapCoI coi (ExplicitList elt_ty exprs') }
+ ; return $ mkHsWrapCo coi (ExplicitList elt_ty exprs') }
where
tc_elt elt_ty expr = tcPolyExpr expr elt_ty
tcExpr (ExplicitPArr _ exprs) res_ty -- maybe empty
= do { (coi, elt_ty) <- matchExpectedPArrTy res_ty
; exprs' <- mapM (tc_elt elt_ty) exprs
- ; return $ mkHsWrapCoI coi (ExplicitPArr elt_ty exprs') }
+ ; return $ mkHsWrapCo coi (ExplicitPArr elt_ty exprs') }
where
tc_elt elt_ty expr = tcPolyExpr expr elt_ty
\end{code}
-- and it maintains uniformity with other rebindable syntax
; return (HsIf (Just fun') pred' b1' b2') }
- tcExpr (HsDo do_or_lc stmts body _) res_ty
- = tcDoStmts do_or_lc stmts body res_ty
+ tcExpr (HsDo do_or_lc stmts _) res_ty
+ = tcDoStmts do_or_lc stmts res_ty
tcExpr (HsProc pat cmd) res_ty
= do { (pat', cmd', coi) <- tcProc pat cmd res_ty
- ; return $ mkHsWrapCoI coi (HsProc pat' cmd') }
+ ; return $ mkHsWrapCo coi (HsProc pat' cmd') }
tcExpr e@(HsArrApp _ _ _ _ _) _
= failWithTc (vcat [ptext (sLit "The arrow command"), nest 2 (ppr e),
; co_res <- unifyType actual_res_ty res_ty
; rbinds' <- tcRecordBinds data_con arg_tys rbinds
- ; return $ mkHsWrapCoI co_res $
+ ; return $ mkHsWrapCo co_res $
RecordCon (L loc con_id) con_expr rbinds' }
\end{code}
-- Take apart a representative constructor
con1 = ASSERT( not (null relevant_cons) ) head relevant_cons
- (con1_tvs, _, _, _, _, con1_arg_tys, _) = dataConFullSig con1
+ (con1_tvs, _, _, _, con1_arg_tys, _) = dataConFullSig con1
con1_flds = dataConFieldLabels con1
con1_res_ty = mkFamilyTyConApp tycon (mkTyVarTys con1_tvs)
; (_, result_inst_tys, result_inst_env) <- tcInstTyVars con1_tvs
; scrut_inst_tys <- zipWithM mk_inst_ty con1_tvs result_inst_tys
- ; let rec_res_ty = substTy result_inst_env con1_res_ty
- con1_arg_tys' = map (substTy result_inst_env) con1_arg_tys
+ ; let rec_res_ty = TcType.substTy result_inst_env con1_res_ty
+ con1_arg_tys' = map (TcType.substTy result_inst_env) con1_arg_tys
scrut_subst = zipTopTvSubst con1_tvs scrut_inst_tys
- scrut_ty = substTy scrut_subst con1_res_ty
+ scrut_ty = TcType.substTy scrut_subst con1_res_ty
; co_res <- unifyType rec_res_ty res_ty
-- Step 7: make a cast for the scrutinee, in the case that it's from a type family
; let scrut_co | Just co_con <- tyConFamilyCoercion_maybe tycon
- = WpCast $ mkTyConApp co_con scrut_inst_tys
+ = WpCast $ mkAxInstCo co_con scrut_inst_tys
| otherwise
= idHsWrapper
-- Phew!
- ; return $ mkHsWrapCoI co_res $
+ ; return $ mkHsWrapCo co_res $
RecordUpd (mkLHsWrap scrut_co record_expr') rbinds'
relevant_cons scrut_inst_tys result_inst_tys }
where
; expr' <- tcPolyExpr expr elt_ty
; enum_from <- newMethodFromName (ArithSeqOrigin seq)
enumFromName elt_ty
- ; return $ mkHsWrapCoI coi (ArithSeq enum_from (From expr')) }
+ ; return $ mkHsWrapCo coi (ArithSeq enum_from (From expr')) }
tcExpr (ArithSeq _ seq@(FromThen expr1 expr2)) res_ty
= do { (coi, elt_ty) <- matchExpectedListTy res_ty
; expr2' <- tcPolyExpr expr2 elt_ty
; enum_from_then <- newMethodFromName (ArithSeqOrigin seq)
enumFromThenName elt_ty
- ; return $ mkHsWrapCoI coi
+ ; return $ mkHsWrapCo coi
(ArithSeq enum_from_then (FromThen expr1' expr2')) }
tcExpr (ArithSeq _ seq@(FromTo expr1 expr2)) res_ty
; expr2' <- tcPolyExpr expr2 elt_ty
; enum_from_to <- newMethodFromName (ArithSeqOrigin seq)
enumFromToName elt_ty
- ; return $ mkHsWrapCoI coi
+ ; return $ mkHsWrapCo coi
(ArithSeq enum_from_to (FromTo expr1' expr2')) }
tcExpr (ArithSeq _ seq@(FromThenTo expr1 expr2 expr3)) res_ty
; expr3' <- tcPolyExpr expr3 elt_ty
; eft <- newMethodFromName (ArithSeqOrigin seq)
enumFromThenToName elt_ty
- ; return $ mkHsWrapCoI coi
+ ; return $ mkHsWrapCo coi
(ArithSeq eft (FromThenTo expr1' expr2' expr3')) }
tcExpr (PArrSeq _ seq@(FromTo expr1 expr2)) res_ty
; expr2' <- tcPolyExpr expr2 elt_ty
; enum_from_to <- newMethodFromName (PArrSeqOrigin seq)
(enumFromToPName basePackageId) elt_ty -- !!!FIXME: chak
- ; return $ mkHsWrapCoI coi
+ ; return $ mkHsWrapCo coi
(PArrSeq enum_from_to (FromTo expr1' expr2')) }
tcExpr (PArrSeq _ seq@(FromThenTo expr1 expr2 expr3)) res_ty
; expr3' <- tcPolyExpr expr3 elt_ty
; eft <- newMethodFromName (PArrSeqOrigin seq)
(enumFromThenToPName basePackageId) elt_ty -- !!!FIXME: chak
- ; return $ mkHsWrapCoI coi
+ ; return $ mkHsWrapCo coi
(PArrSeq eft (FromThenTo expr1' expr2' expr3')) }
tcExpr (PArrSeq _ _) _
-- Typecheck the result, thereby propagating
-- info (if any) from result into the argument types
-- Both actual_res_ty and res_ty are deeply skolemised
- ; co_res <- addErrCtxt (funResCtxt fun) $
+ ; co_res <- addErrCtxtM (funResCtxt fun actual_res_ty res_ty) $
unifyType actual_res_ty res_ty
-- Typecheck the arguments
; args1 <- tcArgs fun args expected_arg_tys
-- Assemble the result
- ; let fun2 = mkLHsWrapCoI co_fun fun1
- app = mkLHsWrapCoI co_res (foldl mkHsApp fun2 args1)
+ ; let fun2 = mkLHsWrapCo co_fun fun1
+ app = mkLHsWrapCo co_res (foldl mkHsApp fun2 args1)
; return (unLoc app) }
; (co_fun, expected_arg_tys, actual_res_ty)
<- matchExpectedFunTys (mk_app_msg fun) (length args) fun_tau
; args1 <- tcArgs fun args expected_arg_tys
- ; let fun2 = mkLHsWrapCoI co_fun fun1
+ ; let fun2 = mkLHsWrapCo co_fun fun1
app = foldl mkHsApp fun2 args1
; return (unLoc app, actual_res_ty) }
----------------
unifyOpFunTys :: LHsExpr Name -> Arity -> TcRhoType
- -> TcM (CoercionI, [TcSigmaType], TcRhoType)
+ -> TcM (Coercion, [TcSigmaType], TcRhoType)
-- A wrapper for matchExpectedFunTys
unifyOpFunTys op arity ty = matchExpectedFunTys herald arity ty
where
; let theta' = substTheta subst theta
; traceTc "Instantiating" (ppr id <+> text "with" <+> (ppr tys $$ ppr theta'))
; wrap <- instCall orig tys theta'
- ; return (mkHsWrap wrap (HsVar id), substTy subst tau) }
+ ; return (mkHsWrap wrap (HsVar id), TcType.substTy subst tau) }
where
(tvs, theta, tau) = tcSplitSigmaTy (idType id)
\end{code}
; let fun' = L loc (HsWrap (WpTyApp rep_ty) (HsVar fun))
rep_ty = mkTyConApp rep_tc rep_args
- ; return (mkHsWrapCoI coi $ HsApp fun' arg') }
+ ; return (mkHsWrapCo coi $ HsApp fun' arg') }
where
doc1 = vcat [ ptext (sLit "Specify the type by giving a type signature")
, ptext (sLit "e.g. (tagToEnum# x) :: Bool") ]
doc3 = ptext (sLit "No family instance for this type")
get_rep_ty :: TcType -> TyCon -> [TcType]
- -> TcM (CoercionI, TyCon, [TcType])
+ -> TcM (Coercion, TyCon, [TcType])
-- Converts a family type (eg F [a]) to its rep type (eg FList a)
-- and returns a coercion between the two
get_rep_ty ty tc tc_args
| not (isFamilyTyCon tc)
- = return (IdCo ty, tc, tc_args)
+ = return (mkReflCo ty, tc, tc_args)
| otherwise
= do { mb_fam <- tcLookupFamInst tc tc_args
; case mb_fam of
Nothing -> failWithTc (tagToEnumError ty doc3)
Just (rep_tc, rep_args)
- -> return ( ACo (mkSymCoercion (mkTyConApp co_tc rep_args))
+ -> return ( mkSymCo (mkAxInstCo co_tc rep_args)
, rep_tc, rep_args )
where
co_tc = expectJust "tcTagToEnum" $
quotes (ppr fun) <> text ", namely"])
2 (quotes (ppr arg))
- funResCtxt :: LHsExpr Name -> SDoc
- funResCtxt fun
- = ptext (sLit "In the return type of a call of") <+> quotes (ppr fun)
+ funResCtxt :: LHsExpr Name -> TcType -> TcType
+ -> TidyEnv -> TcM (TidyEnv, Message)
+ -- When we have a mis-match in the return type of a function
+ -- try to give a helpful message about too many/few arguments
+ funResCtxt fun fun_res_ty res_ty env0
+ = do { fun_res' <- zonkTcType fun_res_ty
+ ; res' <- zonkTcType res_ty
+ ; let n_fun = length (fst (tcSplitFunTys fun_res'))
+ n_res = length (fst (tcSplitFunTys res'))
+ what | n_fun > n_res = ptext (sLit "few")
+ | otherwise = ptext (sLit "many")
+ extra | n_fun == n_res = empty
+ | otherwise = ptext (sLit "Probable cause:") <+> quotes (ppr fun)
+ <+> ptext (sLit "is applied to too") <+> what
+ <+> ptext (sLit "arguments")
+ msg = ptext (sLit "In the return type of a call of") <+> quotes (ppr fun)
+ ; return (env0, msg $$ extra) }
badFieldTypes :: [(Name,TcType)] -> SDoc
badFieldTypes prs
import TysPrim
import TysWiredIn
import Type
-import Var( TyVar )
import TypeRep
import VarSet
import State
single_con_range
= mk_easy_FunBind loc range_RDR
[nlTuplePat [con_pat as_needed, con_pat bs_needed] Boxed] $
- nlHsDo ListComp stmts con_expr
+ noLoc (mkHsComp ListComp stmts con_expr)
where
stmts = zipWith3Equal "single_con_range" mk_qual as_needed bs_needed cs_needed
read_nullary_cons
= case nullary_cons of
[] -> []
- [con] -> [nlHsDo DoExpr (match_con con) (result_expr con [])]
+ [con] -> [nlHsDo DoExpr (match_con con ++ [noLoc $ mkLastStmt (result_expr con [])])]
_ -> [nlHsApp (nlHsVar choose_RDR)
(nlList (map mk_pair nullary_cons))]
-- NB For operators the parens around (:=:) are matched by the
------------------------------------------------------------------------
-- Helpers
------------------------------------------------------------------------
- mk_alt e1 e2 = genOpApp e1 alt_RDR e2 -- e1 +++ e2
- mk_parser p ss b = nlHsApps prec_RDR [nlHsIntLit p, nlHsDo DoExpr ss b] -- prec p (do { ss ; b })
- bindLex pat = noLoc (mkBindStmt pat (nlHsVar lexP_RDR)) -- pat <- lexP
- con_app con as = nlHsVarApps (getRdrName con) as -- con as
- result_expr con as = nlHsApp (nlHsVar returnM_RDR) (con_app con as) -- return (con as)
+ mk_alt e1 e2 = genOpApp e1 alt_RDR e2 -- e1 +++ e2
+ mk_parser p ss b = nlHsApps prec_RDR [nlHsIntLit p -- prec p (do { ss ; b })
+ , nlHsDo DoExpr (ss ++ [noLoc $ mkLastStmt b])]
+ bindLex pat = noLoc (mkBindStmt pat (nlHsVar lexP_RDR)) -- pat <- lexP
+ con_app con as = nlHsVarApps (getRdrName con) as -- con as
+ result_expr con as = nlHsApp (nlHsVar returnM_RDR) (con_app con as) -- return (con as)
punc_pat s = nlConPat punc_RDR [nlLitPat (mkHsString s)] -- Punc 'c'
text "for primitive type" <+> ppr ty)
| otherwise = head res
where
- res = [id | (ty',id) <- tbl, ty `tcEqType` ty']
+ res = [id | (ty',id) <- tbl, ty `eqType` ty']
-----------------------------------------------------------------------
import PrelNames
import TcType
import TcMType
+import Coercion
import TysPrim
import TysWiredIn
import DataCon
import Var
import VarSet
import VarEnv
+import DynFlags( DynFlag(..) )
import Literal
import BasicTypes
import Maybes
import SrcLoc
import Bag
import FastString
import Outputable
+import Data.Traversable( traverse )
\end{code}
\begin{code}
zonkLExpr new_env expr `thenM` \ new_expr ->
returnM (HsLet new_binds new_expr)
- zonkExpr env (HsDo do_or_lc stmts body ty)
- = zonkStmts env stmts `thenM` \ (new_env, new_stmts) ->
- zonkLExpr new_env body `thenM` \ new_body ->
+ zonkExpr env (HsDo do_or_lc stmts ty)
+ = zonkStmts env stmts `thenM` \ (_, new_stmts) ->
zonkTcTypeToType env ty `thenM` \ new_ty ->
- returnM (HsDo do_or_lc new_stmts new_body new_ty)
+ returnM (HsDo do_or_lc new_stmts new_ty)
zonkExpr env (ExplicitList ty exprs)
= zonkTcTypeToType env ty `thenM` \ new_ty ->
zonkCoFn env (WpCompose c1 c2) = do { (env1, c1') <- zonkCoFn env c1
; (env2, c2') <- zonkCoFn env1 c2
; return (env2, WpCompose c1' c2') }
-zonkCoFn env (WpCast co) = do { co' <- zonkTcTypeToType env co
+zonkCoFn env (WpCast co) = do { co' <- zonkTcCoToCo env co
; return (env, WpCast co') }
zonkCoFn env (WpEvLam ev) = do { (env', ev') <- zonkEvBndrX env ev
; return (env', WpEvLam ev') }
; return (env2, s' : ss') }
zonkStmt :: ZonkEnv -> Stmt TcId -> TcM (ZonkEnv, Stmt Id)
- zonkStmt env (ParStmt stmts_w_bndrs)
+ zonkStmt env (ParStmt stmts_w_bndrs mzip_op bind_op return_op)
= mappM zonk_branch stmts_w_bndrs `thenM` \ new_stmts_w_bndrs ->
let
new_binders = concat (map snd new_stmts_w_bndrs)
env1 = extendZonkEnv env new_binders
in
- return (env1, ParStmt new_stmts_w_bndrs)
+ zonkExpr env1 mzip_op `thenM` \ new_mzip ->
+ zonkExpr env1 bind_op `thenM` \ new_bind ->
+ zonkExpr env1 return_op `thenM` \ new_return ->
+ return (env1, ParStmt new_stmts_w_bndrs new_mzip new_bind new_return)
where
zonk_branch (stmts, bndrs) = zonkStmts env stmts `thenM` \ (env1, new_stmts) ->
returnM (new_stmts, zonkIdOccs env1 bndrs)
zonkStmt env (RecStmt { recS_stmts = segStmts, recS_later_ids = lvs, recS_rec_ids = rvs
, recS_ret_fn = ret_id, recS_mfix_fn = mfix_id, recS_bind_fn = bind_id
- , recS_rec_rets = rets })
+ , recS_rec_rets = rets, recS_ret_ty = ret_ty })
= do { new_rvs <- zonkIdBndrs env rvs
; new_lvs <- zonkIdBndrs env lvs
+ ; new_ret_ty <- zonkTcTypeToType env ret_ty
; new_ret_id <- zonkExpr env ret_id
; new_mfix_id <- zonkExpr env mfix_id
; new_bind_id <- zonkExpr env bind_id
RecStmt { recS_stmts = new_segStmts, recS_later_ids = new_lvs
, recS_rec_ids = new_rvs, recS_ret_fn = new_ret_id
, recS_mfix_fn = new_mfix_id, recS_bind_fn = new_bind_id
- , recS_rec_rets = new_rets }) }
+ , recS_rec_rets = new_rets, recS_ret_ty = new_ret_ty }) }
- zonkStmt env (ExprStmt expr then_op ty)
+ zonkStmt env (ExprStmt expr then_op guard_op ty)
= zonkLExpr env expr `thenM` \ new_expr ->
zonkExpr env then_op `thenM` \ new_then ->
+ zonkExpr env guard_op `thenM` \ new_guard ->
zonkTcTypeToType env ty `thenM` \ new_ty ->
- returnM (env, ExprStmt new_expr new_then new_ty)
+ returnM (env, ExprStmt new_expr new_then new_guard new_ty)
- zonkStmt env (TransformStmt stmts binders usingExpr maybeByExpr)
- = do { (env', stmts') <- zonkStmts env stmts
- ; let binders' = zonkIdOccs env' binders
- ; usingExpr' <- zonkLExpr env' usingExpr
- ; maybeByExpr' <- zonkMaybeLExpr env' maybeByExpr
- ; return (env', TransformStmt stmts' binders' usingExpr' maybeByExpr') }
-
- zonkStmt env (GroupStmt stmts binderMap by using)
+ zonkStmt env (LastStmt expr ret_op)
+ = zonkLExpr env expr `thenM` \ new_expr ->
+ zonkExpr env ret_op `thenM` \ new_ret ->
+ returnM (env, LastStmt new_expr new_ret)
+
+ zonkStmt env (TransStmt { trS_stmts = stmts, trS_bndrs = binderMap
+ , trS_by = by, trS_form = form, trS_using = using
+ , trS_ret = return_op, trS_bind = bind_op, trS_fmap = liftM_op })
= do { (env', stmts') <- zonkStmts env stmts
; binderMap' <- mappM (zonkBinderMapEntry env') binderMap
- ; by' <- fmapMaybeM (zonkLExpr env') by
- ; using' <- fmapEitherM (zonkLExpr env) (zonkExpr env) using
+ ; by' <- fmapMaybeM (zonkLExpr env') by
+ ; using' <- zonkLExpr env using
+ ; return_op' <- zonkExpr env' return_op
+ ; bind_op' <- zonkExpr env' bind_op
+ ; liftM_op' <- zonkExpr env' liftM_op
; let env'' = extendZonkEnv env' (map snd binderMap')
- ; return (env'', GroupStmt stmts' binderMap' by' using') }
+ ; return (env'', TransStmt { trS_stmts = stmts', trS_bndrs = binderMap'
+ , trS_by = by', trS_form = form, trS_using = using'
+ , trS_ret = return_op', trS_bind = bind_op', trS_fmap = liftM_op' }) }
where
zonkBinderMapEntry env (oldBinder, newBinder) = do
let oldBinder' = zonkIdOcc env oldBinder
; new_fail <- zonkExpr env fail_op
; return (env1, BindStmt new_pat new_expr new_bind new_fail) }
- zonkMaybeLExpr :: ZonkEnv -> Maybe (LHsExpr TcId) -> TcM (Maybe (LHsExpr Id))
- zonkMaybeLExpr _ Nothing = return Nothing
- zonkMaybeLExpr env (Just e) = (zonkLExpr env e) >>= (return . Just)
-
-
-------------------------------------------------------------------------
zonkRecFields :: ZonkEnv -> HsRecordBinds TcId -> TcM (HsRecordBinds TcId)
zonkRecFields env (HsRecFields flds dd)
zonk_it env v
| isId v = do { v' <- zonkIdBndr env v; return (extendZonkEnv1 env v', v') }
- | isCoVar v = do { v' <- zonkEvBndr env v; return (extendZonkEnv1 env v', v') }
| otherwise = ASSERT( isImmutableTyVar v) return (env, v)
\end{code}
zonkEvTerm :: ZonkEnv -> EvTerm -> TcM EvTerm
zonkEvTerm env (EvId v) = ASSERT2( isId v, ppr v )
return (EvId (zonkIdOcc env v))
-zonkEvTerm env (EvCoercion co) = do { co' <- zonkTcTypeToType env co
+zonkEvTerm env (EvCoercion co) = do { co' <- zonkTcCoToCo env co
; return (EvCoercion co') }
zonkEvTerm env (EvCast v co) = ASSERT( isId v)
- do { co' <- zonkTcTypeToType env co
+ do { co' <- zonkTcCoToCo env co
; return (EvCast (zonkIdOcc env v) co') }
zonkEvTerm env (EvSuperClass d n) = return (EvSuperClass (zonkIdOcc env d) n)
zonkEvTerm env (EvDFunApp df tys tms)
zonk_unbound_tyvar tv = do { let ty = anyTypeOfKind (tyVarKind tv)
; writeMetaTyVar tv ty
; return ty }
+
+zonkTcCoToCo :: ZonkEnv -> Coercion -> TcM Coercion
+zonkTcCoToCo env co
+ = go co
+ where
+ go (CoVarCo cv) = return (CoVarCo (zonkEvVarOcc env cv))
+ go (Refl ty) = do { ty' <- zonkTcTypeToType env ty
+ ; return (Refl ty') }
+ go (TyConAppCo tc cos) = do { cos' <- mapM go cos; return (mkTyConAppCo tc cos') }
+ go (AxiomInstCo ax cos) = do { cos' <- mapM go cos; return (AxiomInstCo ax cos') }
+ go (AppCo co1 co2) = do { co1' <- go co1; co2' <- go co2
+ ; return (mkAppCo co1' co2') }
+ go (PredCo pco) = do { pco' <- go `traverse` pco; return (mkPredCo pco') }
+ go (UnsafeCo t1 t2) = do { t1' <- zonkTcTypeToType env t1
+ ; t2' <- zonkTcTypeToType env t2
+ ; return (mkUnsafeCo t1' t2') }
+ go (SymCo co) = do { co' <- go co; return (mkSymCo co') }
+ go (NthCo n co) = do { co' <- go co; return (mkNthCo n co') }
+ go (TransCo co1 co2) = do { co1' <- go co1; co2' <- go co2
+ ; return (mkTransCo co1' co2') }
+ go (InstCo co ty) = do { co' <- go co; ty' <- zonkTcTypeToType env ty
+ ; return (mkInstCo co' ty') }
+ go (ForAllCo tv co) = ASSERT( isImmutableTyVar tv )
+ do { co' <- go co; return (mkForAllCo tv co') }
- \end{code}
+ \end{code}
TcMatches: Typecheck some @Matches@
\begin{code}
+ {-# OPTIONS_GHC -w #-} -- debugging
module TcMatches ( tcMatchesFun, tcGRHSsPat, tcMatchesCase, tcMatchLambda,
- TcMatchCtxt(..),
- tcStmts, tcDoStmts, tcBody,
- tcDoStmt, tcMDoStmt, tcGuardStmt
+ TcMatchCtxt(..), TcStmtChecker,
+ tcStmts, tcStmtsAndThen, tcDoStmts, tcBody,
+ tcDoStmt, tcGuardStmt
) where
- import {-# SOURCE #-} TcExpr( tcSyntaxOp, tcInferRhoNC, tcCheckId,
+ import {-# SOURCE #-} TcExpr( tcSyntaxOp, tcInferRhoNC, tcInferRho, tcCheckId,
tcMonoExpr, tcMonoExprNC, tcPolyExpr )
import HsSyn
+ import BasicTypes
import TcRnMonad
import TcEnv
import TcPat
import Id
import TyCon
import TysPrim
- import Coercion ( mkSymCo )
-import Coercion ( isIdentityCoI, mkSymCoI )
++import Coercion ( isReflCo, mkSymCo )
import Outputable
- import BasicTypes ( Arity )
import Util
import SrcLoc
import FastString
+ -- Create chunkified tuple tybes for monad comprehensions
+ import MkCore
+
import Control.Monad
#include "HsVersions.h"
matchFunTys herald arity res_ty thing_inside
= do { (coi, pat_tys, res_ty) <- matchExpectedFunTys herald arity res_ty
; res <- thing_inside pat_tys res_ty
- ; return (coiToHsWrapper (mkSymCoI coi), res) }
+ ; return (coToHsWrapper (mkSymCo coi), res) }
\end{code}
%************************************************************************
tcGRHS :: TcMatchCtxt -> TcRhoType -> GRHS Name -> TcM (GRHS TcId)
tcGRHS ctxt res_ty (GRHS guards rhs)
- = do { (guards', rhs') <- tcStmts stmt_ctxt tcGuardStmt guards res_ty $
+ = do { (guards', rhs') <- tcStmtsAndThen stmt_ctxt tcGuardStmt guards res_ty $
mc_body ctxt rhs
; return (GRHS guards' rhs') }
where
\begin{code}
tcDoStmts :: HsStmtContext Name
-> [LStmt Name]
- -> LHsExpr Name
-> TcRhoType
-> TcM (HsExpr TcId) -- Returns a HsDo
- tcDoStmts ListComp stmts body res_ty
+ tcDoStmts ListComp stmts res_ty
= do { (coi, elt_ty) <- matchExpectedListTy res_ty
- ; (stmts', body') <- tcStmts ListComp (tcLcStmt listTyCon) stmts
- elt_ty $
- tcBody body
- ; return $ mkHsWrapCo coi
- (HsDo ListComp stmts' body' (mkListTy elt_ty)) }
+ ; let list_ty = mkListTy elt_ty
+ ; stmts' <- tcStmts ListComp (tcLcStmt listTyCon) stmts elt_ty
- ; return $ mkHsWrapCoI coi (HsDo ListComp stmts' list_ty) }
++ ; return $ mkHsWrapCo coi (HsDo ListComp stmts' list_ty) }
- tcDoStmts PArrComp stmts body res_ty
+ tcDoStmts PArrComp stmts res_ty
= do { (coi, elt_ty) <- matchExpectedPArrTy res_ty
- ; (stmts', body') <- tcStmts PArrComp (tcLcStmt parrTyCon) stmts
- elt_ty $
- tcBody body
- ; return $ mkHsWrapCo coi
- (HsDo PArrComp stmts' body' (mkPArrTy elt_ty)) }
+ ; let parr_ty = mkPArrTy elt_ty
+ ; stmts' <- tcStmts PArrComp (tcLcStmt parrTyCon) stmts elt_ty
- ; return $ mkHsWrapCoI coi (HsDo PArrComp stmts' parr_ty) }
++ ; return $ mkHsWrapCo coi (HsDo PArrComp stmts' parr_ty) }
+
+ tcDoStmts DoExpr stmts res_ty
+ = do { stmts' <- tcStmts DoExpr tcDoStmt stmts res_ty
+ ; return (HsDo DoExpr stmts' res_ty) }
- tcDoStmts DoExpr stmts body res_ty
- = do { (stmts', body') <- tcStmts DoExpr tcDoStmt stmts res_ty $
- tcBody body
- ; return (HsDo DoExpr stmts' body' res_ty) }
+ tcDoStmts MDoExpr stmts res_ty
+ = do { stmts' <- tcStmts MDoExpr tcDoStmt stmts res_ty
+ ; return (HsDo MDoExpr stmts' res_ty) }
- tcDoStmts MDoExpr stmts body res_ty
- = do { (stmts', body') <- tcStmts MDoExpr tcDoStmt stmts res_ty $
- tcBody body
- ; return (HsDo MDoExpr stmts' body' res_ty) }
+ tcDoStmts MonadComp stmts res_ty
+ = do { stmts' <- tcStmts MonadComp tcMcStmt stmts res_ty
+ ; return (HsDo MonadComp stmts' res_ty) }
- tcDoStmts ctxt _ _ _ = pprPanic "tcDoStmts" (pprStmtContext ctxt)
+ tcDoStmts ctxt _ _ = pprPanic "tcDoStmts" (pprStmtContext ctxt)
tcBody :: LHsExpr Name -> TcRhoType -> TcM (LHsExpr TcId)
tcBody body res_ty
-> TcStmtChecker -- NB: higher-rank type
-> [LStmt Name]
-> TcRhoType
- -> (TcRhoType -> TcM thing)
- -> TcM ([LStmt TcId], thing)
+ -> TcM [LStmt TcId]
+ tcStmts ctxt stmt_chk stmts res_ty
+ = do { (stmts', _) <- tcStmtsAndThen ctxt stmt_chk stmts res_ty $
+ const (return ())
+ ; return stmts' }
+
+ tcStmtsAndThen :: HsStmtContext Name
+ -> TcStmtChecker -- NB: higher-rank type
+ -> [LStmt Name]
+ -> TcRhoType
+ -> (TcRhoType -> TcM thing)
+ -> TcM ([LStmt TcId], thing)
-- Note the higher-rank type. stmt_chk is applied at different
-- types in the equations for tcStmts
- tcStmts _ _ [] res_ty thing_inside
+ tcStmtsAndThen _ _ [] res_ty thing_inside
= do { thing <- thing_inside res_ty
; return ([], thing) }
-- LetStmts are handled uniformly, regardless of context
- tcStmts ctxt stmt_chk (L loc (LetStmt binds) : stmts) res_ty thing_inside
+ tcStmtsAndThen ctxt stmt_chk (L loc (LetStmt binds) : stmts) res_ty thing_inside
= do { (binds', (stmts',thing)) <- tcLocalBinds binds $
- tcStmts ctxt stmt_chk stmts res_ty thing_inside
+ tcStmtsAndThen ctxt stmt_chk stmts res_ty thing_inside
; return (L loc (LetStmt binds') : stmts', thing) }
-- For the vanilla case, handle the location-setting part
- tcStmts ctxt stmt_chk (L loc stmt : stmts) res_ty thing_inside
+ tcStmtsAndThen ctxt stmt_chk (L loc stmt : stmts) res_ty thing_inside
= do { (stmt', (stmts', thing)) <-
- setSrcSpan loc $
- addErrCtxt (pprStmtInCtxt ctxt stmt) $
- stmt_chk ctxt stmt res_ty $ \ res_ty' ->
- popErrCtxt $
- tcStmts ctxt stmt_chk stmts res_ty' $
+ setSrcSpan loc $
+ addErrCtxt (pprStmtInCtxt ctxt stmt) $
+ stmt_chk ctxt stmt res_ty $ \ res_ty' ->
+ popErrCtxt $
+ tcStmtsAndThen ctxt stmt_chk stmts res_ty' $
thing_inside
; return (L loc stmt' : stmts', thing) }
- --------------------------------
- -- Pattern guards
+ ---------------------------------------------------
+ -- Pattern guards
+ ---------------------------------------------------
+
tcGuardStmt :: TcStmtChecker
- tcGuardStmt _ (ExprStmt guard _ _) res_ty thing_inside
+ tcGuardStmt _ (ExprStmt guard _ _ _) res_ty thing_inside
= do { guard' <- tcMonoExpr guard boolTy
; thing <- thing_inside res_ty
- ; return (ExprStmt guard' noSyntaxExpr boolTy, thing) }
+ ; return (ExprStmt guard' noSyntaxExpr noSyntaxExpr boolTy, thing) }
tcGuardStmt ctxt (BindStmt pat rhs _ _) res_ty thing_inside
= do { (rhs', rhs_ty) <- tcInferRhoNC rhs -- Stmt has a context already
= pprPanic "tcGuardStmt: unexpected Stmt" (ppr stmt)
- --------------------------------
- -- List comprehensions and PArrays
+ ---------------------------------------------------
+ -- List comprehensions and PArrays
+ -- (no rebindable syntax)
+ ---------------------------------------------------
+
+ -- Dealt with separately, rather than by tcMcStmt, because
+ -- a) PArr isn't (yet) an instance of Monad, so the generality seems overkill
+ -- b) We have special desugaring rules for list comprehensions,
+ -- which avoid creating intermediate lists. They in turn
+ -- assume that the bind/return operations are the regular
+ -- polymorphic ones, and in particular don't have any
+ -- coercion matching stuff in them. It's hard to avoid the
+ -- potential for non-trivial coercions in tcMcStmt
tcLcStmt :: TyCon -- The list/Parray type constructor ([] or PArray)
-> TcStmtChecker
+ tcLcStmt _ _ (LastStmt body _) elt_ty thing_inside
+ = do { body' <- tcMonoExprNC body elt_ty
+ ; thing <- thing_inside (panic "tcLcStmt: thing_inside")
+ ; return (LastStmt body' noSyntaxExpr, thing) }
+
-- A generator, pat <- rhs
- tcLcStmt m_tc ctxt (BindStmt pat rhs _ _) res_ty thing_inside
+ tcLcStmt m_tc ctxt (BindStmt pat rhs _ _) elt_ty thing_inside
= do { pat_ty <- newFlexiTyVarTy liftedTypeKind
; rhs' <- tcMonoExpr rhs (mkTyConApp m_tc [pat_ty])
; (pat', thing) <- tcPat (StmtCtxt ctxt) pat pat_ty $
- thing_inside res_ty
+ thing_inside elt_ty
; return (BindStmt pat' rhs' noSyntaxExpr noSyntaxExpr, thing) }
-- A boolean guard
- tcLcStmt _ _ (ExprStmt rhs _ _) res_ty thing_inside
+ tcLcStmt _ _ (ExprStmt rhs _ _ _) elt_ty thing_inside
= do { rhs' <- tcMonoExpr rhs boolTy
- ; thing <- thing_inside res_ty
- ; return (ExprStmt rhs' noSyntaxExpr boolTy, thing) }
+ ; thing <- thing_inside elt_ty
+ ; return (ExprStmt rhs' noSyntaxExpr noSyntaxExpr boolTy, thing) }
+
+ -- ParStmt: See notes with tcMcStmt
+ tcLcStmt m_tc ctxt (ParStmt bndr_stmts_s _ _ _) elt_ty thing_inside
+ = do { (pairs', thing) <- loop bndr_stmts_s
+ ; return (ParStmt pairs' noSyntaxExpr noSyntaxExpr noSyntaxExpr, thing) }
+ where
+ -- loop :: [([LStmt Name], [Name])] -> TcM ([([LStmt TcId], [TcId])], thing)
+ loop [] = do { thing <- thing_inside elt_ty
+ ; return ([], thing) } -- matching in the branches
+
+ loop ((stmts, names) : pairs)
+ = do { (stmts', (ids, pairs', thing))
+ <- tcStmtsAndThen ctxt (tcLcStmt m_tc) stmts elt_ty $ \ _elt_ty' ->
+ do { ids <- tcLookupLocalIds names
+ ; (pairs', thing) <- loop pairs
+ ; return (ids, pairs', thing) }
+ ; return ( (stmts', ids) : pairs', thing ) }
+
+ tcLcStmt m_tc ctxt (TransStmt { trS_form = form, trS_stmts = stmts
+ , trS_bndrs = bindersMap
+ , trS_by = by, trS_using = using }) elt_ty thing_inside
+ = do { let (bndr_names, n_bndr_names) = unzip bindersMap
+ unused_ty = pprPanic "tcLcStmt: inner ty" (ppr bindersMap)
+ -- The inner 'stmts' lack a LastStmt, so the element type
+ -- passed in to tcStmtsAndThen is never looked at
+ ; (stmts', (bndr_ids, by'))
+ <- tcStmtsAndThen (TransStmtCtxt ctxt) (tcLcStmt m_tc) stmts unused_ty $ \_ -> do
+ { by' <- case by of
+ Nothing -> return Nothing
+ Just e -> do { e_ty <- tcInferRho e; return (Just e_ty) }
+ ; bndr_ids <- tcLookupLocalIds bndr_names
+ ; return (bndr_ids, by') }
+
+ ; let m_app ty = mkTyConApp m_tc [ty]
+
+ --------------- Typecheck the 'using' function -------------
+ -- using :: ((a,b,c)->t) -> m (a,b,c) -> m (a,b,c)m (ThenForm)
+ -- :: ((a,b,c)->t) -> m (a,b,c) -> m (m (a,b,c))) (GroupForm)
+
+ -- n_app :: Type -> Type -- Wraps a 'ty' into '[ty]' for GroupForm
+ ; let n_app = case form of
+ ThenForm -> (\ty -> ty)
+ _ -> m_app
+
+ by_arrow :: Type -> Type -- Wraps 'ty' to '(a->t) -> ty' if the By is present
+ by_arrow = case by' of
+ Nothing -> \ty -> ty
+ Just (_,e_ty) -> \ty -> (alphaTy `mkFunTy` e_ty) `mkFunTy` ty
+
+ tup_ty = mkBigCoreVarTupTy bndr_ids
+ poly_arg_ty = m_app alphaTy
+ poly_res_ty = m_app (n_app alphaTy)
+ using_poly_ty = mkForAllTy alphaTyVar $ by_arrow $
+ poly_arg_ty `mkFunTy` poly_res_ty
+
+ ; using' <- tcPolyExpr using using_poly_ty
+ ; let final_using = fmap (HsWrap (WpTyApp tup_ty)) using'
+
+ -- 'stmts' returns a result of type (m1_ty tuple_ty),
+ -- typically something like [(Int,Bool,Int)]
+ -- We don't know what tuple_ty is yet, so we use a variable
+ ; let mk_n_bndr :: Name -> TcId -> TcId
+ mk_n_bndr n_bndr_name bndr_id = mkLocalId n_bndr_name (n_app (idType bndr_id))
+
+ -- Ensure that every old binder of type `b` is linked up with its
+ -- new binder which should have type `n b`
+ -- See Note [GroupStmt binder map] in HsExpr
+ n_bndr_ids = zipWith mk_n_bndr n_bndr_names bndr_ids
+ bindersMap' = bndr_ids `zip` n_bndr_ids
+
+ -- Type check the thing in the environment with
+ -- these new binders and return the result
+ ; thing <- tcExtendIdEnv n_bndr_ids (thing_inside elt_ty)
+
+ ; return (emptyTransStmt { trS_stmts = stmts', trS_bndrs = bindersMap'
+ , trS_by = fmap fst by', trS_using = final_using
+ , trS_form = form }, thing) }
+
+ tcLcStmt _ _ stmt _ _
+ = pprPanic "tcLcStmt: unexpected Stmt" (ppr stmt)
+
+
+ ---------------------------------------------------
+ -- Monad comprehensions
+ -- (supports rebindable syntax)
+ ---------------------------------------------------
+
+ tcMcStmt :: TcStmtChecker
+
+ tcMcStmt _ (LastStmt body return_op) res_ty thing_inside
+ = do { a_ty <- newFlexiTyVarTy liftedTypeKind
+ ; return_op' <- tcSyntaxOp MCompOrigin return_op
+ (a_ty `mkFunTy` res_ty)
+ ; body' <- tcMonoExprNC body a_ty
+ ; thing <- thing_inside (panic "tcMcStmt: thing_inside")
+ ; return (LastStmt body' return_op', thing) }
+
+ -- Generators for monad comprehensions ( pat <- rhs )
+ --
+ -- [ body | q <- gen ] -> gen :: m a
+ -- q :: a
+ --
+
+ tcMcStmt ctxt (BindStmt pat rhs bind_op fail_op) res_ty thing_inside
+ = do { rhs_ty <- newFlexiTyVarTy liftedTypeKind
+ ; pat_ty <- newFlexiTyVarTy liftedTypeKind
+ ; new_res_ty <- newFlexiTyVarTy liftedTypeKind
+
+ -- (>>=) :: rhs_ty -> (pat_ty -> new_res_ty) -> res_ty
+ ; bind_op' <- tcSyntaxOp MCompOrigin bind_op
+ (mkFunTys [rhs_ty, mkFunTy pat_ty new_res_ty] res_ty)
+
+ -- If (but only if) the pattern can fail, typecheck the 'fail' operator
+ ; fail_op' <- if isIrrefutableHsPat pat
+ then return noSyntaxExpr
+ else tcSyntaxOp MCompOrigin fail_op (mkFunTy stringTy new_res_ty)
+
+ ; rhs' <- tcMonoExprNC rhs rhs_ty
+ ; (pat', thing) <- tcPat (StmtCtxt ctxt) pat pat_ty $
+ thing_inside new_res_ty
+
+ ; return (BindStmt pat' rhs' bind_op' fail_op', thing) }
+
+ -- Boolean expressions.
+ --
+ -- [ body | stmts, expr ] -> expr :: m Bool
+ --
+ tcMcStmt _ (ExprStmt rhs then_op guard_op _) res_ty thing_inside
+ = do { -- Deal with rebindable syntax:
+ -- guard_op :: test_ty -> rhs_ty
+ -- then_op :: rhs_ty -> new_res_ty -> res_ty
+ -- Where test_ty is, for example, Bool
+ test_ty <- newFlexiTyVarTy liftedTypeKind
+ ; rhs_ty <- newFlexiTyVarTy liftedTypeKind
+ ; new_res_ty <- newFlexiTyVarTy liftedTypeKind
+ ; rhs' <- tcMonoExpr rhs test_ty
+ ; guard_op' <- tcSyntaxOp MCompOrigin guard_op
+ (mkFunTy test_ty rhs_ty)
+ ; then_op' <- tcSyntaxOp MCompOrigin then_op
+ (mkFunTys [rhs_ty, new_res_ty] res_ty)
+ ; thing <- thing_inside new_res_ty
+ ; return (ExprStmt rhs' then_op' guard_op' rhs_ty, thing) }
+
+ -- Grouping statements
+ --
+ -- [ body | stmts, then group by e ]
+ -- -> e :: t
+ -- [ body | stmts, then group by e using f ]
+ -- -> e :: t
+ -- f :: forall a. (a -> t) -> m a -> m (m a)
+ -- [ body | stmts, then group using f ]
+ -- -> f :: forall a. m a -> m (m a)
+
+ -- We type [ body | (stmts, group by e using f), ... ]
+ -- f <optional by> [ (a,b,c) | stmts ] >>= \(a,b,c) -> ...body....
+ --
+ -- We type the functions as follows:
+ -- f <optional by> :: m1 (a,b,c) -> m2 (a,b,c) (ThenForm)
+ -- :: m1 (a,b,c) -> m2 (n (a,b,c)) (GroupForm)
+ -- (>>=) :: m2 (a,b,c) -> ((a,b,c) -> res) -> res (ThenForm)
+ -- :: m2 (n (a,b,c)) -> (n (a,b,c) -> res) -> res (GroupForm)
+ --
+ tcMcStmt ctxt (TransStmt { trS_stmts = stmts, trS_bndrs = bindersMap
+ , trS_by = by, trS_using = using, trS_form = form
+ , trS_ret = return_op, trS_bind = bind_op
+ , trS_fmap = fmap_op }) res_ty thing_inside
+ = do { let star_star_kind = liftedTypeKind `mkArrowKind` liftedTypeKind
+ ; m1_ty <- newFlexiTyVarTy star_star_kind
+ ; m2_ty <- newFlexiTyVarTy star_star_kind
+ ; tup_ty <- newFlexiTyVarTy liftedTypeKind
+ ; by_e_ty <- newFlexiTyVarTy liftedTypeKind -- The type of the 'by' expression (if any)
+
+ -- n_app :: Type -> Type -- Wraps a 'ty' into '(n ty)' for GroupForm
+ ; n_app <- case form of
+ ThenForm -> return (\ty -> ty)
+ _ -> do { n_ty <- newFlexiTyVarTy star_star_kind
+ ; return (n_ty `mkAppTy`) }
+ ; let by_arrow :: Type -> Type
+ -- (by_arrow res) produces ((alpha->e_ty) -> res) ('by' present)
+ -- or res ('by' absent)
+ by_arrow = case by of
+ Nothing -> \res -> res
+ Just {} -> \res -> (alphaTy `mkFunTy` by_e_ty) `mkFunTy` res
+
+ poly_arg_ty = m1_ty `mkAppTy` alphaTy
+ using_arg_ty = m1_ty `mkAppTy` tup_ty
+ poly_res_ty = m2_ty `mkAppTy` n_app alphaTy
+ using_res_ty = m2_ty `mkAppTy` n_app tup_ty
+ using_poly_ty = mkForAllTy alphaTyVar $ by_arrow $
+ poly_arg_ty `mkFunTy` poly_res_ty
+
+ -- 'stmts' returns a result of type (m1_ty tuple_ty),
+ -- typically something like [(Int,Bool,Int)]
+ -- We don't know what tuple_ty is yet, so we use a variable
+ ; let (bndr_names, n_bndr_names) = unzip bindersMap
+ ; (stmts', (bndr_ids, by', return_op')) <-
+ tcStmtsAndThen (TransStmtCtxt ctxt) tcMcStmt stmts using_arg_ty $ \res_ty' -> do
+ { by' <- case by of
+ Nothing -> return Nothing
+ Just e -> do { e' <- tcMonoExpr e by_e_ty; return (Just e') }
+
+ -- Find the Ids (and hence types) of all old binders
+ ; bndr_ids <- tcLookupLocalIds bndr_names
+
+ -- 'return' is only used for the binders, so we know its type.
+ -- return :: (a,b,c,..) -> m (a,b,c,..)
+ ; return_op' <- tcSyntaxOp MCompOrigin return_op $
+ (mkBigCoreVarTupTy bndr_ids) `mkFunTy` res_ty'
+
+ ; return (bndr_ids, by', return_op') }
+
+ --------------- Typecheck the 'bind' function -------------
+ -- (>>=) :: m2 (n (a,b,c)) -> ( n (a,b,c) -> new_res_ty ) -> res_ty
+ ; new_res_ty <- newFlexiTyVarTy liftedTypeKind
+ ; bind_op' <- tcSyntaxOp MCompOrigin bind_op $
+ using_res_ty `mkFunTy` (n_app tup_ty `mkFunTy` new_res_ty)
+ `mkFunTy` res_ty
+
+ --------------- Typecheck the 'fmap' function -------------
+ ; fmap_op' <- case form of
+ ThenForm -> return noSyntaxExpr
+ _ -> fmap unLoc . tcPolyExpr (noLoc fmap_op) $
+ mkForAllTy alphaTyVar $ mkForAllTy betaTyVar $
+ (alphaTy `mkFunTy` betaTy)
+ `mkFunTy` (n_app alphaTy)
+ `mkFunTy` (n_app betaTy)
+
+ --------------- Typecheck the 'using' function -------------
+ -- using :: ((a,b,c)->t) -> m1 (a,b,c) -> m2 (n (a,b,c))
+
+ ; using' <- tcPolyExpr using using_poly_ty
+ ; let final_using = fmap (HsWrap (WpTyApp tup_ty)) using'
+
+ --------------- Bulding the bindersMap ----------------
+ ; let mk_n_bndr :: Name -> TcId -> TcId
+ mk_n_bndr n_bndr_name bndr_id = mkLocalId n_bndr_name (n_app (idType bndr_id))
+
+ -- Ensure that every old binder of type `b` is linked up with its
+ -- new binder which should have type `n b`
+ -- See Note [GroupStmt binder map] in HsExpr
+ n_bndr_ids = zipWith mk_n_bndr n_bndr_names bndr_ids
+ bindersMap' = bndr_ids `zip` n_bndr_ids
+
+ -- Type check the thing in the environment with
+ -- these new binders and return the result
+ ; thing <- tcExtendIdEnv n_bndr_ids (thing_inside new_res_ty)
+
+ ; return (TransStmt { trS_stmts = stmts', trS_bndrs = bindersMap'
+ , trS_by = by', trS_using = final_using
+ , trS_ret = return_op', trS_bind = bind_op'
+ , trS_fmap = fmap_op', trS_form = form }, thing) }
-- A parallel set of comprehensions
-- [ (g x, h x) | ... ; let g v = ...
-- ensure that g,h and x,y don't duplicate, and simply grow the environment.
-- So the binders of the first parallel group will be in scope in the second
-- group. But that's fine; there's no shadowing to worry about.
-
- tcLcStmt m_tc ctxt (ParStmt bndr_stmts_s) elt_ty thing_inside
- = do { (pairs', thing) <- loop bndr_stmts_s
- ; return (ParStmt pairs', thing) }
- where
- -- loop :: [([LStmt Name], [Name])] -> TcM ([([LStmt TcId], [TcId])], thing)
- loop [] = do { thing <- thing_inside elt_ty
- ; return ([], thing) } -- matching in the branches
-
- loop ((stmts, names) : pairs)
- = do { (stmts', (ids, pairs', thing))
- <- tcStmts ctxt (tcLcStmt m_tc) stmts elt_ty $ \ _elt_ty' ->
- do { ids <- tcLookupLocalIds names
- ; (pairs', thing) <- loop pairs
- ; return (ids, pairs', thing) }
- ; return ( (stmts', ids) : pairs', thing ) }
-
- tcLcStmt m_tc ctxt (TransformStmt stmts binders usingExpr maybeByExpr) elt_ty thing_inside = do
- (stmts', (binders', usingExpr', maybeByExpr', thing)) <-
- tcStmts (TransformStmtCtxt ctxt) (tcLcStmt m_tc) stmts elt_ty $ \elt_ty' -> do
- let alphaListTy = mkTyConApp m_tc [alphaTy]
-
- (usingExpr', maybeByExpr') <-
- case maybeByExpr of
- Nothing -> do
- -- We must validate that usingExpr :: forall a. [a] -> [a]
- let using_ty = mkForAllTy alphaTyVar (alphaListTy `mkFunTy` alphaListTy)
- usingExpr' <- tcPolyExpr usingExpr using_ty
- return (usingExpr', Nothing)
- Just byExpr -> do
- -- We must infer a type such that e :: t and then check that
- -- usingExpr :: forall a. (a -> t) -> [a] -> [a]
- (byExpr', tTy) <- tcInferRhoNC byExpr
- let using_ty = mkForAllTy alphaTyVar $
- (alphaTy `mkFunTy` tTy)
- `mkFunTy` alphaListTy `mkFunTy` alphaListTy
- usingExpr' <- tcPolyExpr usingExpr using_ty
- return (usingExpr', Just byExpr')
-
- binders' <- tcLookupLocalIds binders
- thing <- thing_inside elt_ty'
-
- return (binders', usingExpr', maybeByExpr', thing)
-
- return (TransformStmt stmts' binders' usingExpr' maybeByExpr', thing)
-
- tcLcStmt m_tc ctxt (GroupStmt stmts bindersMap by using) elt_ty thing_inside
- = do { let (bndr_names, list_bndr_names) = unzip bindersMap
-
- ; (stmts', (bndr_ids, by', using_ty, elt_ty')) <-
- tcStmts (TransformStmtCtxt ctxt) (tcLcStmt m_tc) stmts elt_ty $ \elt_ty' -> do
- (by', using_ty) <-
- case by of
- Nothing -> -- check that using :: forall a. [a] -> [[a]]
- return (Nothing, mkForAllTy alphaTyVar $
- alphaListTy `mkFunTy` alphaListListTy)
-
- Just by_e -> -- check that using :: forall a. (a -> t) -> [a] -> [[a]]
- -- where by :: t
- do { (by_e', t_ty) <- tcInferRhoNC by_e
- ; return (Just by_e', mkForAllTy alphaTyVar $
- (alphaTy `mkFunTy` t_ty)
- `mkFunTy` alphaListTy
- `mkFunTy` alphaListListTy) }
- -- Find the Ids (and hence types) of all old binders
- bndr_ids <- tcLookupLocalIds bndr_names
-
- return (bndr_ids, by', using_ty, elt_ty')
-
- -- Ensure that every old binder of type b is linked up with
- -- its new binder which should have type [b]
- ; let list_bndr_ids = zipWith mk_list_bndr list_bndr_names bndr_ids
- bindersMap' = bndr_ids `zip` list_bndr_ids
- -- See Note [GroupStmt binder map] in HsExpr
-
- ; using' <- case using of
- Left e -> do { e' <- tcPolyExpr e using_ty; return (Left e') }
- Right e -> do { e' <- tcPolyExpr (noLoc e) using_ty; return (Right (unLoc e')) }
-
- -- Type check the thing in the environment with
- -- these new binders and return the result
- ; thing <- tcExtendIdEnv list_bndr_ids (thing_inside elt_ty')
- ; return (GroupStmt stmts' bindersMap' by' using', thing) }
- where
- alphaListTy = mkTyConApp m_tc [alphaTy]
- alphaListListTy = mkTyConApp m_tc [alphaListTy]
-
- mk_list_bndr :: Name -> TcId -> TcId
- mk_list_bndr list_bndr_name bndr_id
- = mkLocalId list_bndr_name (mkTyConApp m_tc [idType bndr_id])
-
- tcLcStmt _ _ stmt _ _
- = pprPanic "tcLcStmt: unexpected Stmt" (ppr stmt)
-
- --------------------------------
- -- Do-notation
- -- The main excitement here is dealing with rebindable syntax
+ --
+ -- Note: The `mzip` function will get typechecked via:
+ --
+ -- ParStmt [st1::t1, st2::t2, st3::t3]
+ --
+ -- mzip :: m st1
+ -- -> (m st2 -> m st3 -> m (st2, st3)) -- recursive call
+ -- -> m (st1, (st2, st3))
+ --
+ tcMcStmt ctxt (ParStmt bndr_stmts_s mzip_op bind_op return_op) res_ty thing_inside
+ = do { let star_star_kind = liftedTypeKind `mkArrowKind` liftedTypeKind
+ ; m_ty <- newFlexiTyVarTy star_star_kind
+
+ ; let mzip_ty = mkForAllTys [alphaTyVar, betaTyVar] $
+ (m_ty `mkAppTy` alphaTy)
+ `mkFunTy`
+ (m_ty `mkAppTy` betaTy)
+ `mkFunTy`
+ (m_ty `mkAppTy` mkBoxedTupleTy [alphaTy, betaTy])
+ ; mzip_op' <- unLoc `fmap` tcPolyExpr (noLoc mzip_op) mzip_ty
+
+ ; return_op' <- fmap unLoc . tcPolyExpr (noLoc return_op) $
+ mkForAllTy alphaTyVar $
+ alphaTy `mkFunTy` (m_ty `mkAppTy` alphaTy)
+
+ ; (pairs', thing) <- loop m_ty bndr_stmts_s
+
+ -- Typecheck bind:
+ ; let tys = map (mkBigCoreVarTupTy . snd) pairs'
+ tuple_ty = mk_tuple_ty tys
+
+ ; bind_op' <- tcSyntaxOp MCompOrigin bind_op $
+ (m_ty `mkAppTy` tuple_ty)
+ `mkFunTy` (tuple_ty `mkFunTy` res_ty)
+ `mkFunTy` res_ty
+
+ ; return (ParStmt pairs' mzip_op' bind_op' return_op', thing) }
+
+ where
+ mk_tuple_ty tys = foldr1 (\tn tm -> mkBoxedTupleTy [tn, tm]) tys
+
+ -- loop :: Type -- m_ty
+ -- -> [([LStmt Name], [Name])]
+ -- -> TcM ([([LStmt TcId], [TcId])], thing)
+ loop _ [] = do { thing <- thing_inside res_ty
+ ; return ([], thing) } -- matching in the branches
+
+ loop m_ty ((stmts, names) : pairs)
+ = do { -- type dummy since we don't know all binder types yet
+ ty_dummy <- newFlexiTyVarTy liftedTypeKind
+ ; (stmts', (ids, pairs', thing))
+ <- tcStmtsAndThen ctxt tcMcStmt stmts ty_dummy $ \res_ty' ->
+ do { ids <- tcLookupLocalIds names
+ ; let m_tup_ty = m_ty `mkAppTy` mkBigCoreVarTupTy ids
+
+ ; check_same m_tup_ty res_ty'
+ ; check_same m_tup_ty ty_dummy
+
+ ; (pairs', thing) <- loop m_ty pairs
+ ; return (ids, pairs', thing) }
+ ; return ( (stmts', ids) : pairs', thing ) }
+
+ -- Check that the types match up.
+ -- This is a grevious hack. They always *will* match
+ -- If (>>=) and (>>) are polymorpic in the return type,
+ -- but we don't have any good way to incorporate the coercion
+ -- so for now we just check that it's the identity
+ check_same actual expected
+ = do { coi <- unifyType actual expected
+ ; unless (isIdentityCoI coi) $
+ failWithMisMatch [UnifyOrigin { uo_expected = expected
+ , uo_actual = actual }] }
+
+ tcMcStmt _ stmt _ _
+ = pprPanic "tcMcStmt: unexpected Stmt" (ppr stmt)
+
+
+ ---------------------------------------------------
+ -- Do-notation
+ -- (supports rebindable syntax)
+ ---------------------------------------------------
tcDoStmt :: TcStmtChecker
+ tcDoStmt _ (LastStmt body _) res_ty thing_inside
+ = do { body' <- tcMonoExprNC body res_ty
+ ; thing <- thing_inside (panic "tcDoStmt: thing_inside")
+ ; return (LastStmt body' noSyntaxExpr, thing) }
+
tcDoStmt ctxt (BindStmt pat rhs bind_op fail_op) res_ty thing_inside
= do { -- Deal with rebindable syntax:
-- (>>=) :: rhs_ty -> (pat_ty -> new_res_ty) -> res_ty
; return (BindStmt pat' rhs' bind_op' fail_op', thing) }
- tcDoStmt _ (ExprStmt rhs then_op _) res_ty thing_inside
+ tcDoStmt _ (ExprStmt rhs then_op _ _) res_ty thing_inside
= do { -- Deal with rebindable syntax;
-- (>>) :: rhs_ty -> new_res_ty -> res_ty
-- See also Note [Treat rebindable syntax first]
; rhs' <- tcMonoExprNC rhs rhs_ty
; thing <- thing_inside new_res_ty
- ; return (ExprStmt rhs' then_op' rhs_ty, thing) }
+ ; return (ExprStmt rhs' then_op' noSyntaxExpr rhs_ty, thing) }
tcDoStmt ctxt (RecStmt { recS_stmts = stmts, recS_later_ids = later_names
, recS_rec_ids = rec_names, recS_ret_fn = ret_op
; tcExtendIdEnv tup_ids $ do
{ stmts_ty <- newFlexiTyVarTy liftedTypeKind
; (stmts', (ret_op', tup_rets))
- <- tcStmts ctxt tcDoStmt stmts stmts_ty $ \ inner_res_ty ->
+ <- tcStmtsAndThen ctxt tcDoStmt stmts stmts_ty $ \ inner_res_ty ->
do { tup_rets <- zipWithM tcCheckId tup_names tup_elt_tys
-- Unify the types of the "final" Ids (which may
-- be polymorphic) with those of "knot-tied" Ids
(mkFunTys [mfix_res_ty, mkFunTy tup_ty new_res_ty] res_ty)
; thing <- thing_inside new_res_ty
- -- ; lie_binds <- bindLocalMethods lie tup_ids
; let rec_ids = takeList rec_names tup_ids
; later_ids <- tcLookupLocalIds later_names
; return (RecStmt { recS_stmts = stmts', recS_later_ids = later_ids
, recS_rec_ids = rec_ids, recS_ret_fn = ret_op'
, recS_mfix_fn = mfix_op', recS_bind_fn = bind_op'
- , recS_rec_rets = tup_rets }, thing)
+ , recS_rec_rets = tup_rets, recS_ret_ty = stmts_ty }, thing)
}}
tcDoStmt _ stmt _ _
Otherwise the error shows up when cheking the rebindable syntax, and
the expected/inferred stuff is back to front (see Trac #3613).
- \begin{code}
- --------------------------------
- -- Mdo-notation
- -- The distinctive features here are
- -- (a) RecStmts, and
- -- (b) no rebindable syntax
-
- tcMDoStmt :: (LHsExpr Name -> TcM (LHsExpr TcId, TcType)) -- RHS inference
- -> TcStmtChecker
- tcMDoStmt tc_rhs ctxt (BindStmt pat rhs _ _) res_ty thing_inside
- = do { (rhs', pat_ty) <- tc_rhs rhs
- ; (pat', thing) <- tcPat (StmtCtxt ctxt) pat pat_ty $
- thing_inside res_ty
- ; return (BindStmt pat' rhs' noSyntaxExpr noSyntaxExpr, thing) }
-
- tcMDoStmt tc_rhs _ (ExprStmt rhs _ _) res_ty thing_inside
- = do { (rhs', elt_ty) <- tc_rhs rhs
- ; thing <- thing_inside res_ty
- ; return (ExprStmt rhs' noSyntaxExpr elt_ty, thing) }
-
- tcMDoStmt tc_rhs ctxt (RecStmt { recS_stmts = stmts, recS_later_ids = laterNames
- , recS_rec_ids = recNames }) res_ty thing_inside
- = do { rec_tys <- newFlexiTyVarTys (length recNames) liftedTypeKind
- ; let rec_ids = zipWith mkLocalId recNames rec_tys
- ; tcExtendIdEnv rec_ids $ do
- { (stmts', (later_ids, rec_rets))
- <- tcStmts ctxt (tcMDoStmt tc_rhs) stmts res_ty $ \ _res_ty' ->
- -- ToDo: res_ty not really right
- do { rec_rets <- zipWithM tcCheckId recNames rec_tys
- ; later_ids <- tcLookupLocalIds laterNames
- ; return (later_ids, rec_rets) }
-
- ; thing <- tcExtendIdEnv later_ids (thing_inside res_ty)
- -- NB: The rec_ids for the recursive things
- -- already scope over this part. This binding may shadow
- -- some of them with polymorphic things with the same Name
- -- (see note [RecStmt] in HsExpr)
-
- ; return (RecStmt stmts' later_ids rec_ids noSyntaxExpr noSyntaxExpr noSyntaxExpr rec_rets, thing)
- }}
-
- tcMDoStmt _ _ stmt _ _
- = pprPanic "tcMDoStmt: unexpected Stmt" (ppr stmt)
- \end{code}
-
%************************************************************************
%* *
import BasicTypes hiding (SuccessFlag(..))
import DynFlags
import SrcLoc
- import ErrUtils
import Util
import Outputable
import FastString
instance Outputable TcSigInfo where
ppr (TcSigInfo { sig_id = id, sig_tvs = tyvars, sig_theta = theta, sig_tau = tau})
- = ppr id <+> ptext (sLit "::") <+> ppr tyvars <+> pprThetaArrow theta <+> ppr tau
+ = ppr id <+> ptext (sLit "::") <+> ppr tyvars <+> pprThetaArrowTy theta <+> ppr tau
\end{code}
Note [sig_tau may be polymorphic]
%************************************************************************
\begin{code}
-tcPatBndr :: PatEnv -> Name -> TcSigmaType -> TcM (CoercionI, TcId)
+tcPatBndr :: PatEnv -> Name -> TcSigmaType -> TcM (Coercion, TcId)
-- (coi, xp) = tcPatBndr penv x pat_ty
-- Then coi : pat_ty ~ typeof(xp)
--
| otherwise
= do { bndr_id <- newNoSigLetBndr no_gen bndr_name pat_ty
- ; return (IdCo pat_ty, bndr_id) }
+ ; return (mkReflCo pat_ty, bndr_id) }
tcPatBndr (PE { pe_ctxt = _lam_or_proc }) bndr_name pat_ty
= do { bndr <- mkLocalBinder bndr_name pat_ty
- ; return (IdCo pat_ty, bndr) }
+ ; return (mkReflCo pat_ty, bndr) }
------------
newSigLetBndr :: LetBndrSpec -> Name -> TcSigInfo -> TcM TcId
-> TcM a
-> TcM (LPat TcId, a)
tc_lpat (L span pat) pat_ty penv thing_inside
- = setSrcSpan span $
- maybeAddErrCtxt (patCtxt pat) $
- do { (pat', res) <- tc_pat penv pat pat_ty thing_inside
+ = setSrcSpan span $
+ do { (pat', res) <- maybeWrapPatCtxt pat (tc_pat penv pat pat_ty)
+ thing_inside
; return (L span pat', res) }
tc_lpats :: PatEnv
tc_pat penv (VarPat name) pat_ty thing_inside
= do { (coi, id) <- tcPatBndr penv name pat_ty
; res <- tcExtendIdEnv1 name id thing_inside
- ; return (mkHsWrapPatCoI coi (VarPat id) pat_ty, res) }
+ ; return (mkHsWrapPatCo coi (VarPat id) pat_ty, res) }
tc_pat penv (ParPat pat) pat_ty thing_inside
= do { (pat', res) <- tc_lpat pat pat_ty penv thing_inside
-- perhaps be fixed, but only with a bit more work.
--
-- If you fix it, don't forget the bindInstsOfPatIds!
- ; return (mkHsWrapPatCoI coi (AsPat (L nm_loc bndr_id) pat') pat_ty, res) }
+ ; return (mkHsWrapPatCo coi (AsPat (L nm_loc bndr_id) pat') pat_ty, res) }
tc_pat penv vpat@(ViewPat expr pat _) overall_pat_ty thing_inside
= do { checkUnboxedTuple overall_pat_ty $
-- pattern must have pat_ty
; (pat', res) <- tc_lpat pat pat_ty penv thing_inside
- ; return (ViewPat (mkLHsWrapCoI expr_coi expr') pat' overall_pat_ty, res) }
+ ; return (ViewPat (mkLHsWrapCo expr_coi expr') pat' overall_pat_ty, res) }
-- Type signatures in patterns
-- See Note [Pattern coercions] below
; coi <- unifyPatType lit_ty pat_ty
-- coi is of kind: pat_ty ~ lit_ty
; res <- thing_inside
- ; return ( mkHsWrapPatCoI coi (LitPat simple_lit) pat_ty
+ ; return ( mkHsWrapPatCo coi (LitPat simple_lit) pat_ty
, res) }
------------------------
; instStupidTheta orig [mkClassPred icls [pat_ty']]
; res <- tcExtendIdEnv1 name bndr_id thing_inside
- ; return (mkHsWrapPatCoI coi pat' pat_ty, res) }
+ ; return (mkHsWrapPatCo coi pat' pat_ty, res) }
tc_pat _ _other_pat _ _ = panic "tc_pat" -- ConPatOut, SigPatOut
----------------
-unifyPatType :: TcType -> TcType -> TcM CoercionI
+unifyPatType :: TcType -> TcType -> TcM Coercion
-- In patterns we want a coercion from the
-- context type (expected) to the actual pattern type
-- But we don't want to reverse the args to unifyType because
-- that controls the actual/expected stuff in error messages
unifyPatType actual_ty expected_ty
= do { coi <- unifyType actual_ty expected_ty
- ; return (mkSymCoI coi) }
+ ; return (mkSymCo coi) }
\end{code}
Note [Hopping the LIE in lazy patterns]
= do { data_con <- tcLookupDataCon con_name
; let tycon = dataConTyCon data_con
-- For data families this is the representation tycon
- (univ_tvs, ex_tvs, eq_spec, eq_theta, dict_theta, arg_tys, _)
+ (univ_tvs, ex_tvs, eq_spec, theta, arg_tys, _)
= dataConFullSig data_con
-- Instantiate the constructor type variables [a->ty]
tenv = zipTopTvSubst (univ_tvs ++ ex_tvs)
(ctxt_res_tys ++ mkTyVarTys ex_tvs')
arg_tys' = substTys tenv arg_tys
- full_theta = eq_theta ++ dict_theta
- ; if null ex_tvs && null eq_spec && null full_theta
+ ; if null ex_tvs && null eq_spec && null theta
then do { -- The common case; no class bindings etc
-- (see Note [Arrows and patterns])
(arg_pats', res) <- tcConArgs data_con arg_tys'
else do -- The general case, with existential,
-- and local equality constraints
- { let eq_preds = [mkEqPred (mkTyVarTy tv, ty) | (tv, ty) <- eq_spec]
- theta' = substTheta tenv (eq_preds ++ full_theta)
+ { let theta' = substTheta tenv (eqSpecPreds eq_spec ++ theta)
-- order is *important* as we generate the list of
-- dictionary binders from theta'
no_equalities = not (any isEqPred theta')
} }
----------------------------
-matchExpectedPatTy :: (TcRhoType -> TcM (CoercionI, a))
+matchExpectedPatTy :: (TcRhoType -> TcM (Coercion, a))
-> TcRhoType -> TcM (HsWrapper, a)
-- See Note [Matching polytyped patterns]
-- Returns a wrapper : pat_ty ~ inner_ty
matchExpectedPatTy inner_match pat_ty
| null tvs && null theta
= do { (coi, res) <- inner_match pat_ty
- ; return (coiToHsWrapper (mkSymCoI coi), res) }
+ ; return (coToHsWrapper (mkSymCo coi), res) }
-- The Sym is because the inner_match returns a coercion
-- that is the other way round to matchExpectedPatTy
| otherwise
= do { (_, tys, subst) <- tcInstTyVars tvs
; wrap1 <- instCall PatOrigin tys (substTheta subst theta)
- ; (wrap2, arg_tys) <- matchExpectedPatTy inner_match (substTy subst tau)
+ ; (wrap2, arg_tys) <- matchExpectedPatTy inner_match (TcType.substTy subst tau)
; return (wrap2 <.> wrap1 , arg_tys) }
where
(tvs, theta, tau) = tcSplitSigmaTy pat_ty
matchExpectedConTy :: TyCon -- The TyCon that this data
-- constructor actually returns
-> TcRhoType -- The type of the pattern
- -> TcM (CoercionI, [TcSigmaType])
+ -> TcM (Coercion, [TcSigmaType])
-- See Note [Matching constructor patterns]
-- Returns a coercion : T ty1 ... tyn ~ pat_ty
-- This is the same way round as matchExpectedListTy etc
; coi1 <- unifyType (mkTyConApp fam_tc (substTys subst fam_args)) pat_ty
-- coi1 : T (ty1,ty2) ~ pat_ty
- ; let coi2 = ACo (mkTyConApp co_tc tys)
+ ; let coi2 = mkAxInstCo co_tc tys
-- coi2 : T (ty1,ty2) ~ T7 ty1 ty2
- ; return (mkTransCoI (mkSymCoI coi2) coi1, tys) }
+ ; return (mkTransCo (mkSymCo coi2) coi1, tys) }
| otherwise
= matchExpectedTyConApp data_tc pat_ty
-- coi : T tys ~ pat_ty
\end{code}
- Noate [
Note [Matching constructor patterns]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Suppose (coi, tys) = matchExpectedConType data_tc pat_ty
-}
\begin{code}
- patCtxt :: Pat Name -> Maybe Message -- Not all patterns are worth pushing a context
- patCtxt (VarPat _) = Nothing
- patCtxt (ParPat _) = Nothing
- patCtxt (AsPat _ _) = Nothing
- patCtxt pat = Just (hang (ptext (sLit "In the pattern:"))
- 2 (ppr pat))
+ maybeWrapPatCtxt :: Pat Name -> (TcM a -> TcM b) -> TcM a -> TcM b
+ -- Not all patterns are worth pushing a context
+ maybeWrapPatCtxt pat tcm thing_inside
+ | not (worth_wrapping pat) = tcm thing_inside
+ | otherwise = addErrCtxt msg $ tcm $ popErrCtxt thing_inside
+ -- Remember to pop before doing thing_inside
+ where
+ worth_wrapping (VarPat {}) = False
+ worth_wrapping (ParPat {}) = False
+ worth_wrapping (AsPat {}) = False
+ worth_wrapping _ = True
+ msg = hang (ptext (sLit "In the pattern:")) 2 (ppr pat)
-----------------------------------------------
checkExistentials :: [TyVar] -> PatEnv -> TcM ()
import NameEnv
import NameSet
import TyCon
-import TysPrim
import SrcLoc
import HscTypes
import ListSetOps
import DataCon
import Type
import Class
+import Pair
import TcType ( orphNamesOfDFunHead )
import Inst ( tcGetInstEnvs )
import Data.List ( sortBy )
check_inst boot_inst
= case [dfun | inst <- local_insts,
let dfun = instanceDFunId inst,
- idType dfun `tcEqType` boot_inst_ty ] of
+ idType dfun `eqType` boot_inst_ty ] of
[] -> do { traceTc "check_inst" (vcat [ text "local_insts" <+> vcat (map (ppr . idType . instanceDFunId) local_insts)
, text "boot_inst" <+> ppr boot_inst
, text "boot_inst_ty" <+> ppr boot_inst_ty
checkBootDecl (AnId id1) (AnId id2)
= ASSERT(id1 == id2)
- (idType id1 `tcEqType` idType id2)
+ (idType id1 `eqType` idType id2)
checkBootDecl (ATyCon tc1) (ATyCon tc2)
= checkBootTyCon tc1 tc2
eqSig (id1, def_meth1) (id2, def_meth2)
= idName id1 == idName id2 &&
- tcEqTypeX env op_ty1 op_ty2 &&
+ eqTypeX env op_ty1 op_ty2 &&
def_meth1 == def_meth2
where
(_, rho_ty1) = splitForAllTys (idType id1)
op_ty2 = funResultTy rho_ty2
eqFD (as1,bs1) (as2,bs2) =
- eqListBy (tcEqTypeX env) (mkTyVarTys as1) (mkTyVarTys as2) &&
- eqListBy (tcEqTypeX env) (mkTyVarTys bs1) (mkTyVarTys bs2)
+ eqListBy (eqTypeX env) (mkTyVarTys as1) (mkTyVarTys as2) &&
+ eqListBy (eqTypeX env) (mkTyVarTys bs1) (mkTyVarTys bs2)
same_kind tv1 tv2 = eqKind (tyVarKind tv1) (tyVarKind tv2)
in
eqListBy eqFD clas_fds1 clas_fds2 &&
(null sc_theta1 && null op_stuff1 && null ats1
|| -- Above tests for an "abstract" class
- eqListBy (tcEqPredX env) sc_theta1 sc_theta2 &&
+ eqListBy (eqPredX env) sc_theta1 sc_theta2 &&
eqListBy eqSig op_stuff1 op_stuff2 &&
eqListBy checkBootTyCon ats1 ats2)
eqSynRhs SynFamilyTyCon SynFamilyTyCon
= True
eqSynRhs (SynonymTyCon t1) (SynonymTyCon t2)
- = tcEqTypeX env t1 t2
+ = eqTypeX env t1 t2
eqSynRhs _ _ = False
in
equalLength tvs1 tvs2 &&
| isAlgTyCon tc1 && isAlgTyCon tc2
= ASSERT(tc1 == tc2)
eqKind (tyConKind tc1) (tyConKind tc2) &&
- eqListBy tcEqPred (tyConStupidTheta tc1) (tyConStupidTheta tc2) &&
+ eqListBy eqPred (tyConStupidTheta tc1) (tyConStupidTheta tc2) &&
eqAlgRhs (algTyConRhs tc1) (algTyConRhs tc2)
| isForeignTyCon tc1 && isForeignTyCon tc2
&& dataConIsInfix c1 == dataConIsInfix c2
&& dataConStrictMarks c1 == dataConStrictMarks c2
&& dataConFieldLabels c1 == dataConFieldLabels c2
- && let tvs1 = dataConUnivTyVars c1 ++ dataConExTyVars c1
- tvs2 = dataConUnivTyVars c2 ++ dataConExTyVars c2
- env = rnBndrs2 env0 tvs1 tvs2
- in
- equalLength tvs1 tvs2 &&
- eqListBy (tcEqPredX env)
- (dataConEqTheta c1 ++ dataConDictTheta c1)
- (dataConEqTheta c2 ++ dataConDictTheta c2) &&
- eqListBy (tcEqTypeX env)
- (dataConOrigArgTys c1)
- (dataConOrigArgTys c2)
+ && eqType (dataConUserType c1) (dataConUserType c2)
----------------
missingBootThing :: Name -> String -> SDoc
--------------------
mkPlan :: LStmt Name -> TcM PlanResult
- mkPlan (L loc (ExprStmt expr _ _)) -- An expression typed at the prompt
+ mkPlan (L loc (ExprStmt expr _ _ _)) -- An expression typed at the prompt
= do { uniq <- newUnique -- is treated very specially
; let fresh_it = itName uniq
the_bind = L loc $ mkFunBind (L loc fresh_it) matches
bind_stmt = L loc $ BindStmt (nlVarPat fresh_it) expr
(HsVar bindIOName) noSyntaxExpr
print_it = L loc $ ExprStmt (nlHsApp (nlHsVar printName) (nlHsVar fresh_it))
- (HsVar thenIOName) placeHolderType
+ (HsVar thenIOName) noSyntaxExpr placeHolderType
-- The plans are:
-- [it <- e; print it] but not if it::()
mkPlan stmt@(L loc (BindStmt {}))
| [v] <- collectLStmtBinders stmt -- One binder, for a bind stmt
= do { let print_v = L loc $ ExprStmt (nlHsApp (nlHsVar printName) (nlHsVar v))
- (HsVar thenIOName) placeHolderType
+ (HsVar thenIOName) noSyntaxExpr placeHolderType
; print_bind_result <- doptM Opt_PrintBindResult
; let print_plan = do
let {
ret_ty = mkListTy unitTy ;
io_ret_ty = mkTyConApp ioTyCon [ret_ty] ;
- tc_io_stmts stmts = tcStmts GhciStmt tcDoStmt stmts io_ret_ty ;
-
+ tc_io_stmts stmts = tcStmtsAndThen GhciStmt tcDoStmt stmts io_ret_ty ;
names = collectLStmtsBinders stmts ;
+ } ;
+
+ -- OK, we're ready to typecheck the stmts
+ traceTc "TcRnDriver.tcGhciStmts: tc stmts" empty ;
+ ((tc_stmts, ids), lie) <- captureConstraints $
+ tc_io_stmts stmts $ \ _ ->
+ mapM tcLookupId names ;
+ -- Look up the names right in the middle,
+ -- where they will all be in scope
- -- mk_return builds the expression
+ -- Simplify the context
+ traceTc "TcRnDriver.tcGhciStmts: simplify ctxt" empty ;
+ const_binds <- checkNoErrs (simplifyInteractive lie) ;
+ -- checkNoErrs ensures that the plan fails if context redn fails
+
+ traceTc "TcRnDriver.tcGhciStmts: done" empty ;
+ let { -- mk_return builds the expression
-- returnIO @ [()] [coerce () x, .., coerce () z]
--
-- Despite the inconvenience of building the type applications etc,
-- then the type checker would instantiate x..z, and we wouldn't
-- get their *polymorphic* values. (And we'd get ambiguity errs
-- if they were overloaded, since they aren't applied to anything.)
- mk_return ids = nlHsApp (nlHsTyApp ret_id [ret_ty])
- (noLoc $ ExplicitList unitTy (map mk_item ids)) ;
+ ret_expr = nlHsApp (nlHsTyApp ret_id [ret_ty])
+ (noLoc $ ExplicitList unitTy (map mk_item ids)) ;
mk_item id = nlHsApp (nlHsTyApp unsafeCoerceId [idType id, unitTy])
- (nlHsVar id)
- } ;
-
- -- OK, we're ready to typecheck the stmts
- traceTc "TcRnDriver.tcGhciStmts: tc stmts" empty ;
- ((tc_stmts, ids), lie) <- captureConstraints $ tc_io_stmts stmts $ \ _ ->
- mapM tcLookupId names ;
- -- Look up the names right in the middle,
- -- where they will all be in scope
-
- -- Simplify the context
- traceTc "TcRnDriver.tcGhciStmts: simplify ctxt" empty ;
- const_binds <- checkNoErrs (simplifyInteractive lie) ;
- -- checkNoErrs ensures that the plan fails if context redn fails
-
- traceTc "TcRnDriver.tcGhciStmts: done" empty ;
+ (nlHsVar id) ;
+ stmts = tc_stmts ++ [noLoc (mkLastStmt ret_expr)]
+ } ;
return (ids, mkHsDictLet (EvBinds const_binds) $
- noLoc (HsDo GhciStmt tc_stmts (mk_return ids) io_ret_ty))
+ noLoc (HsDo GhciStmt stmts io_ret_ty))
}
\end{code}
-- Now typecheck the expression;
-- it might have a rank-2 type (e.g. :t runST)
-
uniq <- newUnique ;
let { fresh_it = itName uniq } ;
- ((_tc_expr, res_ty), lie) <- captureConstraints (tcInferRho rn_expr) ;
- ((qtvs, dicts, _), lie_top) <- captureConstraints $
- simplifyInfer TopLevel
- False {- No MR for now -}
+ ((_tc_expr, res_ty), lie) <- captureConstraints (tcInferRho rn_expr) ;
+ ((qtvs, dicts, _), lie_top) <- captureConstraints $
+ simplifyInfer TopLevel False {- No MR for now -}
[(fresh_it, res_ty)]
lie ;
-
_ <- simplifyInteractive lie_top ; -- Ignore the dicionary bindings
let { all_expr_ty = mkForAllTys qtvs (mkPiTypes dicts res_ty) } ;
ppr_tycons :: [FamInst] -> TypeEnv -> SDoc
ppr_tycons fam_insts type_env
- = text "TYPE CONSTRUCTORS" $$ nest 4 (ppr_tydecls tycons)
+ = vcat [ text "TYPE CONSTRUCTORS"
+ , nest 2 (ppr_tydecls tycons)
+ , text "COERCION AXIOMS"
+ , nest 2 (ppr_axioms (typeEnvCoAxioms type_env)) ]
where
fi_tycons = map famInstTyCon fam_insts
tycons = [tycon | tycon <- typeEnvTyCons type_env, want_tycon tycon]
= vcat (map ppr_tycon (sortLe le_sig tycons))
where
le_sig tycon1 tycon2 = getOccName tycon1 <= getOccName tycon2
- ppr_tycon tycon
- | isCoercionTyCon tycon
- = sep [ptext (sLit "coercion") <+> ppr tycon <+> ppr tvs
- , nest 2 (dcolon <+> pprEqPred (coercionKind (mkTyConApp tycon (mkTyVarTys tvs))))]
- | otherwise = ppr (tyThingToIfaceDecl (ATyCon tycon))
+ ppr_tycon tycon = ppr (tyThingToIfaceDecl (ATyCon tycon))
where
- tvs = take (tyConArity tycon) alphaTyVars
+
+ppr_axioms :: [CoAxiom] -> SDoc
+ppr_axioms axs
+ = vcat (map ppr_ax axs)
+ where
+ ppr_ax ax = sep [ ptext (sLit "coercion") <+> ppr ax <+> ppr (co_ax_tvs ax)
+ , nest 2 (dcolon <+> pprEqPred
+ (Pair (co_ax_lhs ax) (co_ax_rhs ax))) ]
ppr_rules :: [CoreRule] -> SDoc
ppr_rules [] = empty
traceRn = traceOptTcRn Opt_D_dump_rn_trace
traceSplice = traceOptTcRn Opt_D_dump_splices
-
traceIf, traceHiDiffs :: SDoc -> TcRnIf m n ()
traceIf = traceOptIf Opt_D_dump_if_trace
traceHiDiffs = traceOptIf Opt_D_dump_hi_diffs
updCtxt upd = updLclEnv (\ env@(TcLclEnv { tcl_ctxt = ctxt }) ->
env { tcl_ctxt = upd ctxt })
- -- Conditionally add an error context
- maybeAddErrCtxt :: Maybe Message -> TcM a -> TcM a
- maybeAddErrCtxt (Just msg) thing_inside = addErrCtxt msg thing_inside
- maybeAddErrCtxt Nothing thing_inside = thing_inside
-
popErrCtxt :: TcM a -> TcM a
popErrCtxt = updCtxt (\ msgs -> case msgs of { [] -> []; (_ : ms) -> ms })
mkErrInfo :: TidyEnv -> [ErrCtxt] -> TcM SDoc
-- Tidy the error info, trimming excessive contexts
mkErrInfo env ctxts
+ | opt_PprStyle_Debug -- In -dppr-debug style the output
+ = return empty -- just becomes too voluminous
+ | otherwise
= go 0 env ctxts
where
go :: Int -> TidyEnv -> [ErrCtxt] -> TcM SDoc
CtOrigin(..), EqOrigin(..),
WantedLoc, GivenLoc, pushErrCtxt,
- SkolemInfo(..),
+ SkolemInfo(..),
CtFlavor(..), pprFlavorArising, isWanted, isGiven, isDerived,
FlavoredEvVar,
import HsSyn
import HscTypes
import Type
+import Id ( evVarPred )
import Class ( Class )
import DataCon ( DataCon, dataConUserType )
import TcType
-- plus which bit is currently being examined
if_tv_env :: UniqFM TyVar, -- Nested tyvar bindings
+ -- (and coercions)
if_id_env :: UniqFM Id -- Nested id binding
}
\end{code}
%************************************************************************
%* *
Wanted constraints
-
These are forced to be in TcRnTypes because
TcLclEnv mentions WantedConstraints
WantedConstraint mentions CtLoc
pprEvVarTheta ev_vars = pprTheta (map evVarPred ev_vars)
pprEvVarWithType :: EvVar -> SDoc
-pprEvVarWithType v = ppr v <+> dcolon <+> pprPred (evVarPred v)
+pprEvVarWithType v = ppr v <+> dcolon <+> pprPredTy (evVarPred v)
pprWantedsWithLocs :: WantedConstraints -> SDoc
pprWantedsWithLocs wcs
| StandAloneDerivOrigin -- Typechecking stand-alone deriving
| DefaultOrigin -- Typechecking a default decl
| DoOrigin -- Arising from a do expression
+ | MCompOrigin -- Arising from a monad comprehension
| IfOrigin -- Arising from an if statement
| ProcOrigin -- Arising from a proc expression
| AnnOrigin -- An annotation
pprO StandAloneDerivOrigin = ptext (sLit "a 'deriving' declaration")
pprO DefaultOrigin = ptext (sLit "a 'default' declaration")
pprO DoOrigin = ptext (sLit "a do statement")
+ pprO MCompOrigin = ptext (sLit "a statement in a monad comprehension")
pprO ProcOrigin = ptext (sLit "a proc expression")
pprO (TypeEqOrigin eq) = ptext (sLit "an equality") <+> ppr eq
pprO AnnOrigin = ptext (sLit "an annotation")
import qualified TcMType as TcM
import qualified TcEnv as TcM
( checkWellStaged, topIdLvl, tcLookupFamInst, tcGetDefaultTys )
+import Kind
import TcType
import DynFlags
import Bag
import MonadUtils
import VarSet
+import Pair
import FastString
import HsBinds -- for TcEvBinds stuff
import Id
-
import TcRnTypes
+ import Data.IORef
+
#ifdef DEBUG
+ import StaticFlags( opt_PprStyle_Debug )
import Control.Monad( when )
#endif
- import Data.IORef
\end{code}
ppr (CIPCan ip fl ip_nm ty)
= ppr fl <+> ppr ip <+> dcolon <+> parens (ppr ip_nm <> dcolon <> ppr ty)
ppr (CTyEqCan co fl tv ty)
- = ppr fl <+> ppr co <+> dcolon <+> pprEqPred (mkTyVarTy tv, ty)
+ = ppr fl <+> ppr co <+> dcolon <+> pprEqPred (Pair (mkTyVarTy tv) ty)
ppr (CFunEqCan co fl tc tys ty)
- = ppr fl <+> ppr co <+> dcolon <+> pprEqPred (mkTyConApp tc tys, ty)
+ = ppr fl <+> ppr co <+> dcolon <+> pprEqPred (Pair (mkTyConApp tc tys) ty)
ppr (CFrozenErr co fl)
= ppr fl <+> pprEvVarWithType co
\end{code}
#ifdef DEBUG
; count <- TcM.readTcRef step_count
- ; when (count > 0) $
+ ; when (opt_PprStyle_Debug && count > 0) $
TcM.debugDumpTcRn (ptext (sLit "Constraint solver steps =")
<+> int count <+> ppr context)
#endif
bind_lvl = TcM.topIdLvl dfun_id
pprEq :: TcType -> TcType -> SDoc
-pprEq ty1 ty2 = pprPred $ mkEqPred (ty1,ty2)
+pprEq ty1 ty2 = pprPredTy $ mkEqPred (ty1,ty2)
isTouchableMetaTyVar :: TcTyVar -> TcS Bool
isTouchableMetaTyVar tv
matchExpectedListTy, matchExpectedPArrTy,
matchExpectedTyConApp, matchExpectedAppTy,
matchExpectedFunTys, matchExpectedFunKind,
- wrapFunResCoercion
+ wrapFunResCoercion, failWithMisMatch
) where
#include "HsVersions.h"
import HsSyn
import TypeRep
import CoreUtils( mkPiTypes )
-import TcErrors ( unifyCtxt )
+import TcErrors ( unifyCtxt )
import TcMType
import TcIface
import TcRnMonad
import Name
import ErrUtils
import BasicTypes
-
import Maybes ( allMaybes )
import Util
import Outputable
matchExpectedFunTys :: SDoc -- See Note [Herald for matchExpectedFunTys]
-> Arity
-> TcRhoType
- -> TcM (CoercionI, [TcSigmaType], TcRhoType)
+ -> TcM (Coercion, [TcSigmaType], TcRhoType)
-- If matchExpectFunTys n ty = (co, [t1,..,tn], ty_r)
-- then co : ty ~ (t1 -> ... -> tn -> ty_r)
-- then co : ty ~ t1 -> .. -> tn -> ty_r
go n_req ty
- | n_req == 0 = return (IdCo ty, [], ty)
+ | n_req == 0 = return (mkReflCo ty, [], ty)
go n_req ty
| Just ty' <- tcView ty = go n_req ty'
go n_req (FunTy arg_ty res_ty)
| not (isPredTy arg_ty)
= do { (coi, tys, ty_r) <- go (n_req-1) res_ty
- ; return (mkFunTyCoI (IdCo arg_ty) coi, arg_ty:tys, ty_r) }
+ ; return (mkFunCo (mkReflCo arg_ty) coi, arg_ty:tys, ty_r) }
go _ (TyConApp tc _) -- A common case
| not (isSynFamilyTyCon tc)
\begin{code}
----------------------
-matchExpectedListTy :: TcRhoType -> TcM (CoercionI, TcRhoType)
+matchExpectedListTy :: TcRhoType -> TcM (Coercion, TcRhoType)
-- Special case for lists
matchExpectedListTy exp_ty
= do { (coi, [elt_ty]) <- matchExpectedTyConApp listTyCon exp_ty
; return (coi, elt_ty) }
----------------------
-matchExpectedPArrTy :: TcRhoType -> TcM (CoercionI, TcRhoType)
+matchExpectedPArrTy :: TcRhoType -> TcM (Coercion, TcRhoType)
-- Special case for parrs
matchExpectedPArrTy exp_ty
= do { (coi, [elt_ty]) <- matchExpectedTyConApp parrTyCon exp_ty
----------------------
matchExpectedTyConApp :: TyCon -- T :: k1 -> ... -> kn -> *
-> TcRhoType -- orig_ty
- -> TcM (CoercionI, -- T a b c ~ orig_ty
+ -> TcM (Coercion, -- T a b c ~ orig_ty
[TcSigmaType]) -- Element types, a b c
-- It's used for wired-in tycons, so we call checkWiredInTyCon
= do { checkWiredInTyCon tc
; go (tyConArity tc) orig_ty [] }
where
- go :: Int -> TcRhoType -> [TcSigmaType] -> TcM (CoercionI, [TcSigmaType])
+ go :: Int -> TcRhoType -> [TcSigmaType] -> TcM (Coercion, [TcSigmaType])
-- If go n ty tys = (co, [t1..tn] ++ tys)
-- then co : T t1..tn ~ ty
go n_req ty@(TyConApp tycon args) tys
| tc == tycon
= ASSERT( n_req == length args) -- ty::*
- return (IdCo ty, args ++ tys)
+ return (mkReflCo ty, args ++ tys)
go n_req (AppTy fun arg) tys
| n_req > 0
= do { (coi, args) <- go (n_req - 1) fun (arg : tys)
- ; return (mkAppTyCoI coi (IdCo arg), args) }
+ ; return (mkAppCo coi (mkReflCo arg), args) }
go n_req ty tys = defer n_req ty tys
----------------------
matchExpectedAppTy :: TcRhoType -- orig_ty
- -> TcM (CoercionI, -- m a ~ orig_ty
+ -> TcM (Coercion, -- m a ~ orig_ty
(TcSigmaType, TcSigmaType)) -- Returns m, a
-- If the incoming type is a mutable type variable of kind k, then
-- matchExpectedAppTy returns a new type variable (m: * -> k); note the *.
| Just ty' <- tcView ty = go ty'
| Just (fun_ty, arg_ty) <- tcSplitAppTy_maybe ty
- = return (IdCo orig_ty, (fun_ty, arg_ty))
+ = return (mkReflCo orig_ty, (fun_ty, arg_ty))
go (TyVarTy tv)
| ASSERT( isTcTyVar tv) isMetaTyVar tv
<- tcGen ctxt ty_expected $ \ _ sk_rho -> do
{ (in_wrap, in_rho) <- deeplyInstantiate origin ty_actual
; coi <- unifyType in_rho sk_rho
- ; return (coiToHsWrapper coi <.> in_wrap) }
+ ; return (coToHsWrapper coi <.> in_wrap) }
; return (sk_wrap <.> inst_wrap) }
| otherwise -- Urgh! It seems deeply weird to have equality
-- when actual is not a polytype, and it makes a big
-- difference e.g. tcfail104
= do { coi <- unifyType ty_actual ty_expected
- ; return (coiToHsWrapper coi) }
+ ; return (coToHsWrapper coi) }
tcInfer :: (TcType -> TcM a) -> TcM (a, TcType)
tcInfer tc_infer = do { ty <- newFlexiTyVarTy openTypeKind
tcWrapResult expr actual_ty res_ty
= do { coi <- unifyType actual_ty res_ty
-- Both types are deeply skolemised
- ; return (mkHsWrapCoI coi expr) }
+ ; return (mkHsWrapCo coi expr) }
-----------------------------------
wrapFunResCoercion
\begin{code}
---------------
-unifyType :: TcTauType -> TcTauType -> TcM CoercionI
+unifyType :: TcTauType -> TcTauType -> TcM Coercion
-- Actual and expected types
-- Returns a coercion : ty1 ~ ty2
unifyType ty1 ty2 = uType [] ty1 ty2
---------------
-unifyPred :: PredType -> PredType -> TcM CoercionI
+unifyPred :: PredType -> PredType -> TcM Coercion
-- Actual and expected types
unifyPred p1 p2 = uPred [UnifyOrigin (mkPredTy p1) (mkPredTy p2)] p1 p2
---------------
-unifyTheta :: TcThetaType -> TcThetaType -> TcM [CoercionI]
+unifyTheta :: TcThetaType -> TcThetaType -> TcM [Coercion]
-- Actual and expected types
unifyTheta theta1 theta2
= do { checkTc (equalLength theta1 theta2)
:: [EqOrigin]
-> TcType -- ty1 is the *actual* type
-> TcType -- ty2 is the *expected* type
- -> TcM CoercionI
+ -> TcM Coercion
--------------
-- It is always safe to defer unification to the main constraint solver
; doc <- mkErrInfo emptyTidyEnv ctxt
; traceTc "utype_defer" (vcat [ppr co_var, ppr ty1, ppr ty2, ppr origin, doc])
- ; return $ ACo $ mkTyVarTy co_var }
+ ; return $ mkCoVarCo co_var }
uType_defer [] _ _
= panic "uType_defer"
[ sep [ ppr orig_ty1, text "~", ppr orig_ty2]
, ppr origin]
; coi <- go orig_ty1 orig_ty2
- ; case coi of
- ACo co -> traceTc "u_tys yields coercion:" (ppr co)
- IdCo _ -> traceTc "u_tys yields no coercion" empty
+ ; if isReflCo coi
+ then traceTc "u_tys yields no coercion" empty
+ else traceTc "u_tys yields coercion:" (ppr coi)
; return coi }
where
bale_out :: [EqOrigin] -> TcM a
bale_out origin = failWithMisMatch origin
- go :: TcType -> TcType -> TcM CoercionI
+ go :: TcType -> TcType -> TcM Coercion
-- The arguments to 'go' are always semantically identical
-- to orig_ty{1,2} except for looking through type synonyms
| Just ty1' <- tcView ty1 = go ty1' ty2
| Just ty2' <- tcView ty2 = go ty1 ty2'
-- Predicates
go (PredTy p1) (PredTy p2) = uPred origin p1 p2
- -- Coercion functions: (t1a ~ t1b) => t1c ~ (t2a ~ t2b) => t2c
- go ty1 ty2
- | Just (t1a,t1b,t1c) <- splitCoPredTy_maybe ty1,
- Just (t2a,t2b,t2c) <- splitCoPredTy_maybe ty2
- = do { co1 <- uType origin t1a t2a
- ; co2 <- uType origin t1b t2b
- ; co3 <- uType origin t1c t2c
- ; return $ mkCoPredCoI co1 co2 co3 }
-
-- Functions (or predicate functions) just check the two parts
go (FunTy fun1 arg1) (FunTy fun2 arg2)
= do { coi_l <- uType origin fun1 fun2
; coi_r <- uType origin arg1 arg2
- ; return $ mkFunTyCoI coi_l coi_r }
+ ; return $ mkFunCo coi_l coi_r }
-- Always defer if a type synonym family (type function)
-- is involved. (Data families behave rigidly.)
go (TyConApp tc1 tys1) (TyConApp tc2 tys2)
| tc1 == tc2 -- See Note [TyCon app]
= do { cois <- uList origin uType tys1 tys2
- ; return $ mkTyConAppCoI tc1 cois }
+ ; return $ mkTyConAppCo tc1 cois }
-- See Note [Care with type applications]
go (AppTy s1 t1) ty2
| Just (s2,t2) <- tcSplitAppTy_maybe ty2
= do { coi_s <- uType_np origin s1 s2 -- See Note [Unifying AppTy]
; coi_t <- uType origin t1 t2
- ; return $ mkAppTyCoI coi_s coi_t }
+ ; return $ mkAppCo coi_s coi_t }
go ty1 (AppTy s2 t2)
| Just (s1,t1) <- tcSplitAppTy_maybe ty1
= do { coi_s <- uType_np origin s1 s2
; coi_t <- uType origin t1 t2
- ; return $ mkAppTyCoI coi_s coi_t }
+ ; return $ mkAppCo coi_s coi_t }
go ty1 ty2
| tcIsForAllTy ty1 || tcIsForAllTy ty2
-- Anything else fails
go _ _ = bale_out origin
-unifySigmaTy :: [EqOrigin] -> TcType -> TcType -> TcM CoercionI
+unifySigmaTy :: [EqOrigin] -> TcType -> TcType -> TcM Coercion
unifySigmaTy origin ty1 ty2
= do { let (tvs1, body1) = tcSplitForAllTys ty1
(tvs2, body2) = tcSplitForAllTys ty2
-- Get location from monad, not from tvs1
; let tys = mkTyVarTys skol_tvs
in_scope = mkInScopeSet (mkVarSet skol_tvs)
- phi1 = substTy (mkTvSubst in_scope (zipTyEnv tvs1 tys)) body1
- phi2 = substTy (mkTvSubst in_scope (zipTyEnv tvs2 tys)) body2
--- untch = tyVarsOfType ty1 `unionVarSet` tyVarsOfType ty2
+ phi1 = Type.substTy (mkTvSubst in_scope (zipTyEnv tvs1 tys)) body1
+ phi2 = Type.substTy (mkTvSubst in_scope (zipTyEnv tvs2 tys)) body2
; ((coi, _untch), lie) <- captureConstraints $
captureUntouchables $
(failWithMisMatch origin) -- ToDo: give details from bad_lie
; emitConstraints lie
- ; return (foldr mkForAllTyCoI coi skol_tvs) }
+ ; return (foldr mkForAllCo coi skol_tvs) }
----------
-uPred :: [EqOrigin] -> PredType -> PredType -> TcM CoercionI
+uPred :: [EqOrigin] -> PredType -> PredType -> TcM Coercion
uPred origin (IParam n1 t1) (IParam n2 t2)
| n1 == n2
= do { coi <- uType origin t1 t2
- ; return $ mkIParamPredCoI n1 coi }
+ ; return $ mkPredCo $ IParam n1 coi }
uPred origin (ClassP c1 tys1) (ClassP c2 tys2)
| c1 == c2
= do { cois <- uList origin uType tys1 tys2
-- Guaranteed equal lengths because the kinds check
- ; return $ mkClassPPredCoI c1 cois }
+ ; return $ mkPredCo $ ClassP c1 cois }
+
uPred origin (EqPred ty1a ty1b) (EqPred ty2a ty2b)
- = do { coia <- uType origin ty1a ty2a
- ; coib <- uType origin ty1b ty2b
- ; return $ mkEqPredCoI coia coib }
+ = do { coa <- uType origin ty1a ty2a
+ ; cob <- uType origin ty1b ty2b
+ ; return $ mkPredCo $ EqPred coa cob }
uPred origin _ _ = failWithMisMatch origin
back into @uTys@ if it turns out that the variable is already bound.
\begin{code}
-uVar :: [EqOrigin] -> SwapFlag -> TcTyVar -> TcTauType -> TcM CoercionI
+uVar :: [EqOrigin] -> SwapFlag -> TcTyVar -> TcTauType -> TcM Coercion
uVar origin swapped tv1 ty2
= do { traceTc "uVar" (vcat [ ppr origin
, ppr swapped
-> SwapFlag
-> TcTyVar -> TcTyVarDetails -- Tyvar 1
-> TcTauType -- Type 2
- -> TcM CoercionI
+ -> TcM Coercion
-- "Unfilled" means that the variable is definitely not a filled-in meta tyvar
-- It might be a skolem, or untouchable, or meta
uUnfilledVar origin swapped tv1 details1 (TyVarTy tv2)
| tv1 == tv2 -- Same type variable => no-op
- = return (IdCo (mkTyVarTy tv1))
+ = return (mkReflCo (mkTyVarTy tv1))
| otherwise -- Distinct type variables
= do { lookup2 <- lookupTcTyVar tv2
-> SwapFlag
-> TcTyVar -> TcTyVarDetails -- Tyvar 1
-> TcTyVar -> TcTyVarDetails -- Tyvar 2
- -> TcM CoercionI
+ -> TcM Coercion
-- Invarant: The type variables are distinct,
-- Neither is filled in yet
details = ASSERT2( isTcTyVar tyvar, ppr tyvar )
tcTyVarDetails tyvar
-updateMeta :: TcTyVar -> TcRef MetaDetails -> TcType -> TcM CoercionI
+updateMeta :: TcTyVar -> TcRef MetaDetails -> TcType -> TcM Coercion
updateMeta tv1 ref1 ty2
= do { writeMetaTyVarRef tv1 ref1 ty2
- ; return (IdCo ty2) }
+ ; return (mkReflCo ty2) }
\end{code}
Note [Unifying untouchables]
projects / ghc-hetmet.git / commitdiff