%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[RnExpr]{Renaming of expressions}
Basically dependency analysis.
-Handles @Match@, @GRHSsAndBinds@, @HsExpr@, and @Qualifier@ datatypes. In
+Handles @Match@, @GRHSs@, @HsExpr@, and @Qualifier@ datatypes. In
general, all of these functions return a renamed thing, and a set of
free variables.
\begin{code}
-#include "HsVersions.h"
-
module RnExpr (
- rnMatch, rnGRHSsAndBinds, rnPat,
+ rnMatch, rnGRHSs, rnPat, rnExpr, rnExprs,
checkPrecMatch
) where
-IMP_Ubiq()
-#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ <= 201
-IMPORT_DELOOPER(RnLoop) -- break the RnPass/RnExpr/RnBinds loops
-#else
-import {-# SOURCE #-} RnBinds
-import {-# SOURCE #-} RnSource ( rnHsSigType )
-#endif
+#include "HsVersions.h"
+
+import {-# SOURCE #-} RnBinds ( rnBinds )
+import {-# SOURCE #-} RnSource ( rnHsSigType, rnHsPolyType, rnHsType )
import HsSyn
import RdrHsSyn
import RnHsSyn
import RnMonad
import RnEnv
-import CmdLineOpts ( opt_GlasgowExts )
-import BasicTypes ( Fixity(..), FixityDirection(..) )
-import PrelInfo ( numClass_RDR, fractionalClass_RDR, eqClass_RDR, ccallableClass_RDR,
- creturnableClass_RDR, monadZeroClass_RDR, enumClass_RDR, ordClass_RDR,
- ratioDataCon_RDR, negate_RDR
+import RnIfaces ( lookupFixity )
+import CmdLineOpts ( opt_GlasgowExts, opt_IgnoreAsserts )
+import BasicTypes ( Fixity(..), FixityDirection(..), defaultFixity, negateFixity, negatePrecedence )
+import PrelInfo ( numClass_RDR, fractionalClass_RDR, eqClass_RDR,
+ ccallableClass_RDR, creturnableClass_RDR,
+ monadClass_RDR, enumClass_RDR, ordClass_RDR,
+ ratioDataCon_RDR, negate_RDR, assertErr_RDR,
+ ioDataCon_RDR
)
import TysPrim ( charPrimTyCon, addrPrimTyCon, intPrimTyCon,
floatPrimTyCon, doublePrimTyCon
)
-import TyCon ( TyCon )
-import Id ( GenId )
-import ErrUtils ( addErrLoc, addShortErrLocLine )
-import Name
-import Pretty
-import UniqFM ( lookupUFM, {- ToDo:rm-} isNullUFM )
-import UniqSet ( emptyUniqSet, unitUniqSet,
- unionUniqSets, unionManyUniqSets,
- SYN_IE(UniqSet)
+import Name ( nameUnique, isLocallyDefined, NamedThing(..)
+ , mkSysLocalName, nameSrcLoc
)
-import Util ( Ord3(..), removeDups, panic, pprPanic, assertPanic )
+import NameSet
+import UniqFM ( isNullUFM )
+import FiniteMap ( elemFM )
+import UniqSet ( emptyUniqSet, UniqSet )
+import Unique ( assertIdKey )
+import Util ( removeDups )
+import ListSetOps ( unionLists )
+import Maybes ( maybeToBool )
import Outputable
-
\end{code}
*********************************************************
\begin{code}
-rnPat :: RdrNamePat -> RnMS s RenamedPat
+rnPat :: RdrNamePat -> RnMS (RenamedPat, FreeVars)
-rnPat WildPatIn = returnRn WildPatIn
+rnPat WildPatIn = returnRn (WildPatIn, emptyFVs)
rnPat (VarPatIn name)
= lookupBndrRn name `thenRn` \ vname ->
- returnRn (VarPatIn vname)
+ returnRn (VarPatIn vname, emptyFVs)
+rnPat (SigPatIn pat ty)
+ | opt_GlasgowExts
+ = rnPat pat `thenRn` \ (pat', fvs1) ->
+ rnHsPolyType doc ty `thenRn` \ (ty', fvs2) ->
+ returnRn (SigPatIn pat' ty', fvs1 `plusFV` fvs2)
+
+ | otherwise
+ = addErrRn (patSigErr ty) `thenRn_`
+ rnPat pat
+ where
+ doc = text "a pattern type-signature"
+
rnPat (LitPatIn lit)
- = litOccurrence lit `thenRn_`
- lookupImplicitOccRn eqClass_RDR `thenRn_` -- Needed to find equality on pattern
- returnRn (LitPatIn lit)
+ = litOccurrence lit `thenRn` \ fvs1 ->
+ lookupImplicitOccRn eqClass_RDR `thenRn` \ eq -> -- Needed to find equality on pattern
+ returnRn (LitPatIn lit, fvs1 `addOneFV` eq)
rnPat (LazyPatIn pat)
- = rnPat pat `thenRn` \ pat' ->
- returnRn (LazyPatIn pat')
+ = rnPat pat `thenRn` \ (pat', fvs) ->
+ returnRn (LazyPatIn pat', fvs)
rnPat (AsPatIn name pat)
- = rnPat pat `thenRn` \ pat' ->
+ = rnPat pat `thenRn` \ (pat', fvs) ->
lookupBndrRn name `thenRn` \ vname ->
- returnRn (AsPatIn vname pat')
+ returnRn (AsPatIn vname pat', fvs)
rnPat (ConPatIn con pats)
- = lookupOccRn con `thenRn` \ con' ->
- mapRn rnPat pats `thenRn` \ patslist ->
- returnRn (ConPatIn con' patslist)
+ = lookupOccRn con `thenRn` \ con' ->
+ mapFvRn rnPat pats `thenRn` \ (patslist, fvs) ->
+ returnRn (ConPatIn con' patslist, fvs `addOneFV` con')
rnPat (ConOpPatIn pat1 con _ pat2)
- = rnPat pat1 `thenRn` \ pat1' ->
+ = rnPat pat1 `thenRn` \ (pat1', fvs1) ->
lookupOccRn con `thenRn` \ con' ->
- lookupFixity con `thenRn` \ fixity ->
- rnPat pat2 `thenRn` \ pat2' ->
- mkConOpPatRn pat1' con' fixity pat2'
+ rnPat pat2 `thenRn` \ (pat2', fvs2) ->
+
+ getModeRn `thenRn` \ mode ->
+ -- See comments with rnExpr (OpApp ...)
+ (case mode of
+ InterfaceMode -> returnRn (ConOpPatIn pat1' con' defaultFixity pat2')
+ SourceMode -> lookupFixity con' `thenRn` \ fixity ->
+ mkConOpPatRn pat1' con' fixity pat2'
+ ) `thenRn` \ pat' ->
+ returnRn (pat', fvs1 `plusFV` fvs2 `addOneFV` con')
-- Negated patters can only be literals, and they are dealt with
-- by negating the literal at compile time, not by using the negation
rnPat neg@(NegPatIn pat)
= checkRn (valid_neg_pat pat) (negPatErr neg)
`thenRn_`
- rnPat pat `thenRn` \ pat' ->
- returnRn (NegPatIn pat')
+ rnPat pat `thenRn` \ (pat', fvs) ->
+ returnRn (NegPatIn pat', fvs)
where
- valid_neg_pat (LitPatIn (HsInt _)) = True
- valid_neg_pat (LitPatIn (HsFrac _)) = True
- valid_neg_pat _ = False
+ valid_neg_pat (LitPatIn (HsInt _)) = True
+ valid_neg_pat (LitPatIn (HsIntPrim _)) = True
+ valid_neg_pat (LitPatIn (HsFrac _)) = True
+ valid_neg_pat (LitPatIn (HsFloatPrim _)) = True
+ valid_neg_pat (LitPatIn (HsDoublePrim _)) = True
+ valid_neg_pat _ = False
rnPat (ParPatIn pat)
- = rnPat pat `thenRn` \ pat' ->
- returnRn (ParPatIn pat')
+ = rnPat pat `thenRn` \ (pat', fvs) ->
+ returnRn (ParPatIn pat', fvs)
rnPat (NPlusKPatIn name lit)
- = litOccurrence lit `thenRn_`
- lookupImplicitOccRn ordClass_RDR `thenRn_`
+ = litOccurrence lit `thenRn` \ fvs ->
+ lookupImplicitOccRn ordClass_RDR `thenRn` \ ord ->
lookupBndrRn name `thenRn` \ name' ->
- returnRn (NPlusKPatIn name' lit)
+ returnRn (NPlusKPatIn name' lit, fvs `addOneFV` ord)
rnPat (ListPatIn pats)
- = addImplicitOccRn listType_name `thenRn_`
- mapRn rnPat pats `thenRn` \ patslist ->
- returnRn (ListPatIn patslist)
+ = mapFvRn rnPat pats `thenRn` \ (patslist, fvs) ->
+ returnRn (ListPatIn patslist, fvs `addOneFV` listTyCon_name)
-rnPat (TuplePatIn pats)
- = addImplicitOccRn (tupleType_name (length pats)) `thenRn_`
- mapRn rnPat pats `thenRn` \ patslist ->
- returnRn (TuplePatIn patslist)
+rnPat (TuplePatIn pats boxed)
+ = mapFvRn rnPat pats `thenRn` \ (patslist, fvs) ->
+ returnRn (TuplePatIn patslist boxed, fvs `addOneFV` tycon_name)
+ where
+ tycon_name = tupleTyCon_name boxed (length pats)
rnPat (RecPatIn con rpats)
= lookupOccRn con `thenRn` \ con' ->
- rnRpats rpats `thenRn` \ rpats' ->
- returnRn (RecPatIn con' rpats')
+ rnRpats rpats `thenRn` \ (rpats', fvs) ->
+ returnRn (RecPatIn con' rpats', fvs `addOneFV` con')
\end{code}
************************************************************************
************************************************************************
\begin{code}
-rnMatch, rnMatch1 :: RdrNameMatch -> RnMS s (RenamedMatch, FreeVars)
+rnMatch :: RdrNameMatch -> RnMS (RenamedMatch, FreeVars)
--- The only tricky bit here is that we want to do a single
--- bindLocalsRn for all the matches together, so that we spot
--- the repeated variable in
--- f x x = 1
+rnMatch match@(Match _ pats maybe_rhs_sig grhss)
+ = pushSrcLocRn (getMatchLoc match) $
-rnMatch match
- = bindLocalsRn "pattern" (get_binders match) $ \ new_binders ->
- rnMatch1 match `thenRn` \ (match', fvs) ->
- returnRn (match', fvs `minusNameSet` mkNameSet new_binders)
- where
- get_binders (GRHSMatch _) = []
- get_binders (PatMatch pat match) = collectPatBinders pat ++ get_binders match
-
-rnMatch1 (PatMatch pat match)
- = rnPat pat `thenRn` \ pat' ->
- rnMatch1 match `thenRn` \ (match', fvs) ->
- returnRn (PatMatch pat' match', fvs)
+ -- Find the universally quantified type variables
+ -- in the pattern type signatures
+ getLocalNameEnv `thenRn` \ name_env ->
+ let
+ tyvars_in_sigs = rhs_sig_tyvars `unionLists` tyvars_in_pats
+ rhs_sig_tyvars = case maybe_rhs_sig of
+ Nothing -> []
+ Just ty -> extractHsTyRdrNames ty
+ tyvars_in_pats = extractPatsTyVars pats
+ forall_tyvars = filter (not . (`elemFM` name_env)) tyvars_in_sigs
+ doc = text "a pattern type-signature"
+ in
+ bindTyVarsFVRn doc (map UserTyVar forall_tyvars) $ \ sig_tyvars ->
+
+ -- Note that we do a single bindLocalsRn for all the
+ -- matches together, so that we spot the repeated variable in
+ -- f x x = 1
+ bindLocalsFVRn doc (collectPatsBinders pats) $ \ new_binders ->
+
+ mapFvRn rnPat pats `thenRn` \ (pats', pat_fvs) ->
+ rnGRHSs grhss `thenRn` \ (grhss', grhss_fvs) ->
+ (case maybe_rhs_sig of
+ Nothing -> returnRn (Nothing, emptyFVs)
+ Just ty | opt_GlasgowExts -> rnHsType doc ty `thenRn` \ (ty', ty_fvs) ->
+ returnRn (Just ty', ty_fvs)
+ | otherwise -> addErrRn (patSigErr ty) `thenRn_`
+ returnRn (Nothing, emptyFVs)
+ ) `thenRn` \ (maybe_rhs_sig', ty_fvs) ->
-rnMatch1 (GRHSMatch grhss_and_binds)
- = rnGRHSsAndBinds grhss_and_binds `thenRn` \ (grhss_and_binds', fvs) ->
- returnRn (GRHSMatch grhss_and_binds', fvs)
+ let
+ binder_set = mkNameSet new_binders
+ unused_binders = nameSetToList (binder_set `minusNameSet` grhss_fvs)
+ all_fvs = grhss_fvs `plusFV` pat_fvs `plusFV` ty_fvs
+ in
+ warnUnusedMatches unused_binders `thenRn_`
+
+ returnRn (Match sig_tyvars pats' maybe_rhs_sig' grhss', all_fvs)
+ -- The bindLocals and bindTyVars will remove the bound FVs
\end{code}
%************************************************************************
%* *
-\subsubsection{Guarded right-hand sides (GRHSsAndBinds)}
+\subsubsection{Guarded right-hand sides (GRHSs)}
%* *
%************************************************************************
\begin{code}
-rnGRHSsAndBinds :: RdrNameGRHSsAndBinds -> RnMS s (RenamedGRHSsAndBinds, FreeVars)
-
-rnGRHSsAndBinds (GRHSsAndBindsIn grhss binds)
- = rnBinds binds $ \ binds' ->
- rnGRHSs grhss `thenRn` \ (grhss', fvGRHS) ->
- returnRn (GRHSsAndBindsIn grhss' binds', fvGRHS)
- where
- rnGRHSs [] = returnRn ([], emptyNameSet)
-
- rnGRHSs (grhs:grhss)
- = rnGRHS grhs `thenRn` \ (grhs', fvs) ->
- rnGRHSs grhss `thenRn` \ (grhss', fvss) ->
- returnRn (grhs' : grhss', fvs `unionNameSets` fvss)
-
- rnGRHS (GRHS guard expr locn)
- = pushSrcLocRn locn $
- (if not (opt_GlasgowExts || is_standard_guard guard) then
- addWarnRn (nonStdGuardErr guard)
- else
+rnGRHSs :: RdrNameGRHSs -> RnMS (RenamedGRHSs, FreeVars)
+
+rnGRHSs (GRHSs grhss binds maybe_ty)
+ = ASSERT( not (maybeToBool maybe_ty) )
+ rnBinds binds $ \ binds' ->
+ mapFvRn rnGRHS grhss `thenRn` \ (grhss', fvGRHSs) ->
+ returnRn (GRHSs grhss' binds' Nothing, fvGRHSs)
+
+rnGRHS (GRHS guarded locn)
+ = pushSrcLocRn locn $
+ (if not (opt_GlasgowExts || is_standard_guard guarded) then
+ addWarnRn (nonStdGuardErr guarded)
+ else
returnRn ()
- ) `thenRn_`
-
- (rnStmts rnExpr guard $ \ guard' ->
- -- This nested thing deals with scope and
- -- the free vars of the guard, and knocking off the
- -- free vars of the rhs that are bound by the guard
-
- rnExpr expr `thenRn` \ (expr', fvse) ->
- returnRn (GRHS guard' expr' locn, fvse))
-
- rnGRHS (OtherwiseGRHS expr locn)
- = pushSrcLocRn locn $
- rnExpr expr `thenRn` \ (expr', fvs) ->
- returnRn (GRHS [] expr' locn, fvs)
+ ) `thenRn_`
+ rnStmts rnExpr guarded `thenRn` \ (guarded', fvs) ->
+ returnRn (GRHS guarded' locn, fvs)
+ where
-- 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 [GuardStmt _ _] = True
- is_standard_guard other = False
+ is_standard_guard [ExprStmt _ _] = True
+ is_standard_guard [GuardStmt _ _, ExprStmt _ _] = True
+ is_standard_guard other = False
\end{code}
%************************************************************************
%************************************************************************
\begin{code}
-rnExprs :: [RdrNameHsExpr] -> RnMS s ([RenamedHsExpr], FreeVars)
+rnExprs :: [RdrNameHsExpr] -> RnMS ([RenamedHsExpr], FreeVars)
rnExprs ls = rnExprs' ls emptyUniqSet
where
rnExprs' [] acc = returnRn ([], acc)
-- Now we do a "seq" on the free vars because typically it's small
-- or empty, especially in very long lists of constants
let
- acc' = acc `unionNameSets` fvExpr
+ acc' = acc `plusFV` fvExpr
in
(grubby_seqNameSet acc' rnExprs') exprs acc' `thenRn` \ (exprs', fvExprs) ->
returnRn (expr':exprs', fvExprs)
| otherwise = result
\end{code}
-Variables. We look up the variable and return the resulting name. The
-interesting question is what the free-variable set should be. We
-don't want to return imported or prelude things as free vars. So we
-look at the Name returned from the lookup, and make it part of the
-free-var set iff if it's a LocallyDefined Name.
-\end{itemize}
+Variables. We look up the variable and return the resulting name.
\begin{code}
-rnExpr :: RdrNameHsExpr -> RnMS s (RenamedHsExpr, FreeVars)
+rnExpr :: RdrNameHsExpr -> RnMS (RenamedHsExpr, FreeVars)
rnExpr (HsVar v)
- = lookupOccRn v `thenRn` \ vname ->
- returnRn (HsVar vname, if isLocallyDefined vname
- then unitNameSet vname
- else emptyUniqSet)
+ = lookupOccRn v `thenRn` \ name ->
+ if nameUnique name == assertIdKey then
+ -- We expand it to (GHCerr.assert__ location)
+ mkAssertExpr
+ else
+ -- The normal case
+ returnRn (HsVar name, unitFV name)
rnExpr (HsLit lit)
- = litOccurrence lit `thenRn_`
- returnRn (HsLit lit, emptyNameSet)
+ = litOccurrence lit `thenRn` \ fvs ->
+ returnRn (HsLit lit, fvs)
rnExpr (HsLam match)
= rnMatch match `thenRn` \ (match', fvMatch) ->
rnExpr (HsApp fun arg)
= rnExpr fun `thenRn` \ (fun',fvFun) ->
rnExpr arg `thenRn` \ (arg',fvArg) ->
- returnRn (HsApp fun' arg', fvFun `unionNameSets` fvArg)
+ returnRn (HsApp fun' arg', fvFun `plusFV` fvArg)
-rnExpr (OpApp e1 op@(HsVar op_name) _ e2)
+rnExpr (OpApp e1 op _ e2)
= rnExpr e1 `thenRn` \ (e1', fv_e1) ->
rnExpr e2 `thenRn` \ (e2', fv_e2) ->
- rnExpr op `thenRn` \ (op', fv_op) ->
+ rnExpr op `thenRn` \ (op'@(HsVar op_name), fv_op) ->
-- Deal with fixity
-- When renaming code synthesised from "deriving" declarations
-- we're in Interface mode, and we should ignore fixity; assume
-- that the deriving code generator got the association correct
- lookupFixity op_name `thenRn` \ fixity ->
+ -- Don't even look up the fixity when in interface mode
getModeRn `thenRn` \ mode ->
(case mode of
- SourceMode -> mkOpAppRn e1' op' fixity e2'
- InterfaceMode _ -> returnRn (OpApp e1' op' fixity e2')
+ SourceMode -> lookupFixity op_name `thenRn` \ fixity ->
+ mkOpAppRn e1' op' fixity e2'
+ InterfaceMode -> returnRn (OpApp e1' op' defaultFixity e2')
) `thenRn` \ final_e ->
returnRn (final_e,
- fv_e1 `unionNameSets` fv_op `unionNameSets` fv_e2)
+ fv_e1 `plusFV` fv_op `plusFV` fv_e2)
+
+-- constant-fold some negate applications on unboxed literals. Since
+-- negate is a polymorphic function, we have to do these here.
+rnExpr (NegApp (HsLit (HsIntPrim i)) _) = rnExpr (HsLit (HsIntPrim (-i)))
+rnExpr (NegApp (HsLit (HsFloatPrim i)) _) = rnExpr (HsLit (HsFloatPrim (-i)))
+rnExpr (NegApp (HsLit (HsDoublePrim i)) _) = rnExpr (HsLit (HsDoublePrim (-i)))
rnExpr (NegApp e n)
= rnExpr e `thenRn` \ (e', fv_e) ->
lookupImplicitOccRn negate_RDR `thenRn` \ neg ->
mkNegAppRn e' (HsVar neg) `thenRn` \ final_e ->
- returnRn (final_e, fv_e)
+ returnRn (final_e, fv_e `addOneFV` neg)
rnExpr (HsPar e)
= rnExpr e `thenRn` \ (e', fvs_e) ->
rnExpr (SectionL expr op)
= rnExpr expr `thenRn` \ (expr', fvs_expr) ->
rnExpr op `thenRn` \ (op', fvs_op) ->
- returnRn (SectionL expr' op', fvs_op `unionNameSets` fvs_expr)
+ returnRn (SectionL expr' op', fvs_op `plusFV` fvs_expr)
rnExpr (SectionR op expr)
= rnExpr op `thenRn` \ (op', fvs_op) ->
rnExpr expr `thenRn` \ (expr', fvs_expr) ->
- returnRn (SectionR op' expr', fvs_op `unionNameSets` fvs_expr)
+ returnRn (SectionR op' expr', fvs_op `plusFV` fvs_expr)
rnExpr (CCall fun args may_gc is_casm fake_result_ty)
- = lookupImplicitOccRn ccallableClass_RDR `thenRn_`
- lookupImplicitOccRn creturnableClass_RDR `thenRn_`
+ -- Check out the comment on RnIfaces.getNonWiredDataDecl about ccalls
+ = lookupImplicitOccRn ccallableClass_RDR `thenRn` \ cc ->
+ lookupImplicitOccRn creturnableClass_RDR `thenRn` \ cr ->
+ lookupImplicitOccRn ioDataCon_RDR `thenRn` \ io ->
rnExprs args `thenRn` \ (args', fvs_args) ->
- returnRn (CCall fun args' may_gc is_casm fake_result_ty, fvs_args)
+ returnRn (CCall fun args' may_gc is_casm fake_result_ty,
+ fvs_args `addOneFV` cc `addOneFV` cr `addOneFV` io)
-rnExpr (HsSCC label expr)
+rnExpr (HsSCC lbl expr)
= rnExpr expr `thenRn` \ (expr', fvs_expr) ->
- returnRn (HsSCC label expr', fvs_expr)
+ returnRn (HsSCC lbl expr', fvs_expr)
rnExpr (HsCase expr ms src_loc)
= pushSrcLocRn src_loc $
rnExpr expr `thenRn` \ (new_expr, e_fvs) ->
- mapAndUnzipRn rnMatch ms `thenRn` \ (new_ms, ms_fvs) ->
- returnRn (HsCase new_expr new_ms src_loc, unionManyNameSets (e_fvs : ms_fvs))
+ mapFvRn rnMatch ms `thenRn` \ (new_ms, ms_fvs) ->
+ returnRn (HsCase new_expr new_ms src_loc, e_fvs `plusFV` ms_fvs)
rnExpr (HsLet binds expr)
= rnBinds binds $ \ binds' ->
rnExpr (HsDo do_or_lc stmts src_loc)
= pushSrcLocRn src_loc $
- lookupImplicitOccRn monadZeroClass_RDR `thenRn_` -- Forces Monad to come too
- (rnStmts rnExpr stmts $ \ stmts' ->
- returnRn (HsDo do_or_lc stmts' src_loc, emptyNameSet))
+ lookupImplicitOccRn monadClass_RDR `thenRn` \ monad ->
+ rnStmts rnExpr stmts `thenRn` \ (stmts', fvs) ->
+ returnRn (HsDo do_or_lc stmts' src_loc, fvs `addOneFV` monad)
rnExpr (ExplicitList exps)
- = addImplicitOccRn listType_name `thenRn_`
- rnExprs exps `thenRn` \ (exps', fvs) ->
- returnRn (ExplicitList exps', fvs)
+ = rnExprs exps `thenRn` \ (exps', fvs) ->
+ returnRn (ExplicitList exps', fvs `addOneFV` listTyCon_name)
-rnExpr (ExplicitTuple exps)
- = addImplicitOccRn (tupleType_name (length exps)) `thenRn_`
- rnExprs exps `thenRn` \ (exps', fvExps) ->
- returnRn (ExplicitTuple exps', fvExps)
+rnExpr (ExplicitTuple exps boxed)
+ = rnExprs exps `thenRn` \ (exps', fvs) ->
+ returnRn (ExplicitTuple exps' boxed, fvs `addOneFV` tycon_name)
+ where
+ tycon_name = tupleTyCon_name boxed (length exps)
-rnExpr (RecordCon (HsVar con) rbinds)
- = lookupOccRn con `thenRn` \ conname ->
+rnExpr (RecordCon con_id rbinds)
+ = lookupOccRn con_id `thenRn` \ conname ->
rnRbinds "construction" rbinds `thenRn` \ (rbinds', fvRbinds) ->
- returnRn (RecordCon (HsVar conname) rbinds', fvRbinds)
+ returnRn (RecordCon conname rbinds', fvRbinds `addOneFV` conname)
rnExpr (RecordUpd expr rbinds)
= rnExpr expr `thenRn` \ (expr', fvExpr) ->
rnRbinds "update" rbinds `thenRn` \ (rbinds', fvRbinds) ->
- returnRn (RecordUpd expr' rbinds', fvExpr `unionNameSets` fvRbinds)
+ returnRn (RecordUpd expr' rbinds', fvExpr `plusFV` fvRbinds)
rnExpr (ExprWithTySig expr pty)
- = rnExpr expr `thenRn` \ (expr', fvExpr) ->
- rnHsSigType (\ sty -> text "an expression") pty `thenRn` \ pty' ->
- returnRn (ExprWithTySig expr' pty', fvExpr)
+ = rnExpr expr `thenRn` \ (expr', fvExpr) ->
+ rnHsSigType (text "an expression") pty `thenRn` \ (pty', fvTy) ->
+ returnRn (ExprWithTySig expr' pty', fvExpr `plusFV` fvTy)
rnExpr (HsIf p b1 b2 src_loc)
= pushSrcLocRn src_loc $
rnExpr p `thenRn` \ (p', fvP) ->
rnExpr b1 `thenRn` \ (b1', fvB1) ->
rnExpr b2 `thenRn` \ (b2', fvB2) ->
- returnRn (HsIf p' b1' b2' src_loc, unionManyNameSets [fvP, fvB1, fvB2])
+ returnRn (HsIf p' b1' b2' src_loc, plusFVs [fvP, fvB1, fvB2])
rnExpr (ArithSeqIn seq)
- = lookupImplicitOccRn enumClass_RDR `thenRn_`
+ = lookupImplicitOccRn enumClass_RDR `thenRn` \ enum ->
rn_seq seq `thenRn` \ (new_seq, fvs) ->
- returnRn (ArithSeqIn new_seq, fvs)
+ returnRn (ArithSeqIn new_seq, fvs `addOneFV` enum)
where
rn_seq (From expr)
= rnExpr expr `thenRn` \ (expr', fvExpr) ->
rn_seq (FromThen expr1 expr2)
= rnExpr expr1 `thenRn` \ (expr1', fvExpr1) ->
rnExpr expr2 `thenRn` \ (expr2', fvExpr2) ->
- returnRn (FromThen expr1' expr2', fvExpr1 `unionNameSets` fvExpr2)
+ returnRn (FromThen expr1' expr2', fvExpr1 `plusFV` fvExpr2)
rn_seq (FromTo expr1 expr2)
= rnExpr expr1 `thenRn` \ (expr1', fvExpr1) ->
rnExpr expr2 `thenRn` \ (expr2', fvExpr2) ->
- returnRn (FromTo expr1' expr2', fvExpr1 `unionNameSets` fvExpr2)
+ returnRn (FromTo expr1' expr2', fvExpr1 `plusFV` fvExpr2)
rn_seq (FromThenTo expr1 expr2 expr3)
= rnExpr expr1 `thenRn` \ (expr1', fvExpr1) ->
rnExpr expr2 `thenRn` \ (expr2', fvExpr2) ->
rnExpr expr3 `thenRn` \ (expr3', fvExpr3) ->
returnRn (FromThenTo expr1' expr2' expr3',
- unionManyNameSets [fvExpr1, fvExpr2, fvExpr3])
+ plusFVs [fvExpr1, fvExpr2, fvExpr3])
+\end{code}
+
+These three are pattern syntax appearing in expressions.
+Since all the symbols are reservedops we can simply reject them.
+We return a (bogus) EWildPat in each case.
+
+\begin{code}
+rnExpr e@EWildPat = addErrRn (patSynErr e) `thenRn_`
+ returnRn (EWildPat, emptyFVs)
+
+rnExpr e@(EAsPat _ _) = addErrRn (patSynErr e) `thenRn_`
+ returnRn (EWildPat, emptyFVs)
+
+rnExpr e@(ELazyPat _) = addErrRn (patSynErr e) `thenRn_`
+ returnRn (EWildPat, emptyFVs)
\end{code}
%************************************************************************
\begin{code}
rnRbinds str rbinds
- = mapRn field_dup_err dup_fields `thenRn_`
- mapAndUnzipRn rn_rbind rbinds `thenRn` \ (rbinds', fvRbind_s) ->
- returnRn (rbinds', unionManyNameSets fvRbind_s)
+ = mapRn_ field_dup_err dup_fields `thenRn_`
+ mapFvRn rn_rbind rbinds `thenRn` \ (rbinds', fvRbind) ->
+ returnRn (rbinds', fvRbind)
where
- (_, dup_fields) = removeDups cmp [ f | (f,_,_) <- rbinds ]
+ (_, dup_fields) = removeDups compare [ f | (f,_,_) <- rbinds ]
field_dup_err dups = addErrRn (dupFieldErr str dups)
rn_rbind (field, expr, pun)
= lookupGlobalOccRn field `thenRn` \ fieldname ->
rnExpr expr `thenRn` \ (expr', fvExpr) ->
- returnRn ((fieldname, expr', pun), fvExpr)
+ returnRn ((fieldname, expr', pun), fvExpr `addOneFV` fieldname)
rnRpats rpats
- = mapRn field_dup_err dup_fields `thenRn_`
- mapRn rn_rpat rpats
+ = mapRn_ field_dup_err dup_fields `thenRn_`
+ mapFvRn rn_rpat rpats `thenRn` \ (rpats', fvs) ->
+ returnRn (rpats', fvs)
where
- (_, dup_fields) = removeDups cmp [ f | (f,_,_) <- rpats ]
+ (_, dup_fields) = removeDups compare [ f | (f,_,_) <- rpats ]
field_dup_err dups = addErrRn (dupFieldErr "pattern" dups)
rn_rpat (field, pat, pun)
= lookupGlobalOccRn field `thenRn` \ fieldname ->
- rnPat pat `thenRn` \ pat' ->
- returnRn (fieldname, pat', pun)
+ rnPat pat `thenRn` \ (pat', fvs) ->
+ returnRn ((fieldname, pat', pun), fvs `addOneFV` fieldname)
\end{code}
%************************************************************************
Quals.
\begin{code}
-type RnExprTy s = RdrNameHsExpr -> RnMS s (RenamedHsExpr, FreeVars)
+type RnExprTy = RdrNameHsExpr -> RnMS (RenamedHsExpr, FreeVars)
-rnStmts :: RnExprTy s
+rnStmts :: RnExprTy
-> [RdrNameStmt]
- -> ([RenamedStmt] -> RnMS s (a, FreeVars))
- -> RnMS s (a, FreeVars)
+ -> RnMS ([RenamedStmt], FreeVars)
-rnStmts rn_expr [] thing_inside
- = thing_inside []
+rnStmts rn_expr []
+ = returnRn ([], emptyFVs)
-rnStmts rn_expr (stmt:stmts) thing_inside
+rnStmts rn_expr (stmt:stmts)
= rnStmt rn_expr stmt $ \ stmt' ->
- rnStmts rn_expr stmts $ \ stmts' ->
- thing_inside (stmt' : stmts')
+ rnStmts rn_expr stmts `thenRn` \ (stmts', fvs) ->
+ returnRn (stmt' : stmts', fvs)
-rnStmt :: RnExprTy s -> RdrNameStmt -> (RenamedStmt -> RnMS s (a, FreeVars)) -> RnMS s (a, FreeVars)
+rnStmt :: RnExprTy -> RdrNameStmt
+ -> (RenamedStmt -> RnMS (a, FreeVars))
+ -> RnMS (a, FreeVars)
-- Because of mutual recursion we have to pass in rnExpr.
rnStmt rn_expr (BindStmt pat expr src_loc) thing_inside
= pushSrcLocRn src_loc $
rn_expr expr `thenRn` \ (expr', fv_expr) ->
- bindLocalsRn "pattern in do binding" binders $ \ new_binders ->
- rnPat pat `thenRn` \ pat' ->
-
+ bindLocalsFVRn doc binders $ \ new_binders ->
+ rnPat pat `thenRn` \ (pat', fv_pat) ->
thing_inside (BindStmt pat' expr' src_loc) `thenRn` \ (result, fvs) ->
- returnRn (result, fv_expr `unionNameSets` (fvs `minusNameSet` mkNameSet new_binders))
+ returnRn (result, fv_expr `plusFV` fvs `plusFV` fv_pat)
where
binders = collectPatBinders pat
+ doc = text "a pattern in do binding"
rnStmt rn_expr (ExprStmt expr src_loc) thing_inside
= pushSrcLocRn src_loc $
rn_expr expr `thenRn` \ (expr', fv_expr) ->
thing_inside (ExprStmt expr' src_loc) `thenRn` \ (result, fvs) ->
- returnRn (result, fv_expr `unionNameSets` fvs)
+ returnRn (result, fv_expr `plusFV` fvs)
rnStmt rn_expr (GuardStmt expr src_loc) thing_inside
= pushSrcLocRn src_loc $
rn_expr expr `thenRn` \ (expr', fv_expr) ->
thing_inside (GuardStmt expr' src_loc) `thenRn` \ (result, fvs) ->
- returnRn (result, fv_expr `unionNameSets` fvs)
+ returnRn (result, fv_expr `plusFV` fvs)
rnStmt rn_expr (ReturnStmt expr) thing_inside
= rn_expr expr `thenRn` \ (expr', fv_expr) ->
thing_inside (ReturnStmt expr') `thenRn` \ (result, fvs) ->
- returnRn (result, fv_expr `unionNameSets` fvs)
+ returnRn (result, fv_expr `plusFV` fvs)
rnStmt rn_expr (LetStmt binds) thing_inside
= rnBinds binds $ \ binds' ->
Furthermore, the second argument is guaranteed not to be another
operator application. Why? Because the parser parses all
-operator appications left-associatively.
+operator appications left-associatively, EXCEPT negation, which
+we need to handle specially.
\begin{code}
-mkOpAppRn :: RenamedHsExpr -> RenamedHsExpr -> Fixity -> RenamedHsExpr
- -> RnMS s RenamedHsExpr
-
-mkOpAppRn e1@(OpApp e11 op1 fix1 e12)
- op2 fix2 e2
+mkOpAppRn :: RenamedHsExpr -- Left operand; already rearranged
+ -> RenamedHsExpr -> Fixity -- Operator and fixity
+ -> RenamedHsExpr -- Right operand (not an OpApp, but might
+ -- be a NegApp)
+ -> RnMS RenamedHsExpr
+
+---------------------------
+-- (e11 `op1` e12) `op2` e2
+mkOpAppRn e1@(OpApp e11 op1 fix1 e12) op2 fix2 e2
| nofix_error
= addErrRn (precParseErr (get op1,fix1) (get op2,fix2)) `thenRn_`
returnRn (OpApp e1 op2 fix2 e2)
- | rearrange_me
+ | associate_right
= mkOpAppRn e12 op2 fix2 e2 `thenRn` \ new_e ->
returnRn (OpApp e11 op1 fix1 new_e)
where
- (nofix_error, rearrange_me) = compareFixity fix1 fix2
+ (nofix_error, associate_right) = compareFixity fix1 fix2
-mkOpAppRn e1@(NegApp neg_arg neg_op)
- op2
- fix2@(Fixity prec2 dir2)
- e2
+---------------------------
+-- (- neg_arg) `op` e2
+mkOpAppRn e1@(NegApp neg_arg neg_op) op2 fix2 e2
| nofix_error
- = addErrRn (precParseErr (get neg_op,fix_neg) (get op2,fix2)) `thenRn_`
+ = addErrRn (precParseErr (get neg_op,negateFixity) (get op2,fix2)) `thenRn_`
returnRn (OpApp e1 op2 fix2 e2)
- | rearrange_me
+ | associate_right
= mkOpAppRn neg_arg op2 fix2 e2 `thenRn` \ new_e ->
returnRn (NegApp new_e neg_op)
where
- fix_neg = Fixity 6 InfixL -- Precedence of unary negate is wired in as infixl 6!
- (nofix_error, rearrange_me) = compareFixity fix_neg fix2
+ (nofix_error, associate_right) = compareFixity negateFixity fix2
+
+---------------------------
+-- e1 `op` - neg_arg
+mkOpAppRn e1 op1 fix1 e2@(NegApp neg_arg neg_op) -- NegApp can occur on the right
+ | not associate_right -- We *want* right association
+ = addErrRn (precParseErr (get op1, fix1) (get neg_op, negateFixity)) `thenRn_`
+ returnRn (OpApp e1 op1 fix1 e2)
+ where
+ (nofix_err, associate_right) = compareFixity fix1 negateFixity
+---------------------------
+-- Default case
mkOpAppRn e1 op fix e2 -- Default case, no rearrangment
- = ASSERT( right_op_ok fix e2 )
+ = ASSERT2( right_op_ok fix e2,
+ ppr e1 $$ text "---" $$ ppr op $$ text "---" $$ ppr fix $$ text "---" $$ ppr e2
+ )
returnRn (OpApp e1 op fix e2)
get (HsVar n) = n
\begin{code}
mkConOpPatRn :: RenamedPat -> Name -> Fixity -> RenamedPat
- -> RnMS s RenamedPat
+ -> RnMS RenamedPat
mkConOpPatRn p1@(ConOpPatIn p11 op1 fix1 p12)
op2 fix2 p2
= addErrRn (precParseErr (op1,fix1) (op2,fix2)) `thenRn_`
returnRn (ConOpPatIn p1 op2 fix2 p2)
- | rearrange_me
+ | associate_right
= mkConOpPatRn p12 op2 fix2 p2 `thenRn` \ new_p ->
returnRn (ConOpPatIn p11 op1 fix1 new_p)
where
- (nofix_error, rearrange_me) = compareFixity fix1 fix2
+ (nofix_error, associate_right) = compareFixity fix1 fix2
mkConOpPatRn p1@(NegPatIn neg_arg)
op2
fix2@(Fixity prec2 dir2)
p2
- | prec2 > 6 -- Precedence of unary - is wired in as 6!
+ | prec2 > negatePrecedence -- Precedence of unary - is wired in
= addErrRn (precParseNegPatErr (op2,fix2)) `thenRn_`
returnRn (ConOpPatIn p1 op2 fix2 p2)
\end{code}
\begin{code}
-checkPrecMatch :: Bool -> RdrName -> RdrNameMatch -> RnMS s ()
+checkPrecMatch :: Bool -> Name -> RenamedMatch -> RnMS ()
checkPrecMatch False fn match
= returnRn ()
-checkPrecMatch True op (PatMatch p1 (PatMatch p2 (GRHSMatch _)))
- = checkPrec op p1 False `thenRn_`
- checkPrec op p2 True
-checkPrecMatch True op _
- = panic "checkPrecMatch"
+
+checkPrecMatch True op (Match _ [p1,p2] _ _)
+ = getModeRn `thenRn` \ mode ->
+ -- See comments with rnExpr (OpApp ...)
+ case mode of
+ InterfaceMode -> returnRn ()
+ SourceMode -> checkPrec op p1 False `thenRn_`
+ checkPrec op p2 True
+
+checkPrecMatch True op _ = panic "checkPrecMatch"
checkPrec op (ConOpPatIn _ op1 _ _) right
= lookupFixity op `thenRn` \ op_fix@(Fixity op_prec op_dir) ->
checkPrec op (NegPatIn _) right
= lookupFixity op `thenRn` \ op_fix@(Fixity op_prec op_dir) ->
- checkRn (op_prec <= 6) (precParseNegPatErr (op,op_fix))
+ checkRn (op_prec <= negatePrecedence) (precParseNegPatErr (op,op_fix))
checkPrec op pat right
= returnRn ()
\end{code}
Consider
+\begin{verbatim}
a `op1` b `op2` c
-
-(compareFixity op1 op2) tells which way to arrange appication, or
+\end{verbatim}
+@(compareFixity op1 op2)@ tells which way to arrange appication, or
whether there's an error.
\begin{code}
-> (Bool, -- Error please
Bool) -- Associate to the right: a op1 (b op2 c)
compareFixity (Fixity prec1 dir1) (Fixity prec2 dir2)
- = case prec1 `cmp` prec2 of
- GT_ -> left
- LT_ -> right
- EQ_ -> case (dir1, dir2) of
+ = case prec1 `compare` prec2 of
+ GT -> left
+ LT -> right
+ EQ -> case (dir1, dir2) of
(InfixR, InfixR) -> right
(InfixL, InfixL) -> left
_ -> error_please
%* *
%************************************************************************
-When literals occur we have to make sure that the types and classes they involve
+When literals occur we have to make sure
+that the types and classes they involve
are made available.
\begin{code}
litOccurrence (HsChar _)
- = addImplicitOccRn charType_name
+ = returnRn (unitFV charTyCon_name)
litOccurrence (HsCharPrim _)
- = addImplicitOccRn (getName charPrimTyCon)
+ = returnRn (unitFV (getName charPrimTyCon))
litOccurrence (HsString _)
- = addImplicitOccRn listType_name `thenRn_`
- addImplicitOccRn charType_name
+ = returnRn (unitFV listTyCon_name `plusFV` unitFV charTyCon_name)
litOccurrence (HsStringPrim _)
- = addImplicitOccRn (getName addrPrimTyCon)
+ = returnRn (unitFV (getName addrPrimTyCon))
litOccurrence (HsInt _)
- = lookupImplicitOccRn numClass_RDR -- Int and Integer are forced in by Num
+ = lookupImplicitOccRn numClass_RDR `thenRn` \ num ->
+ returnRn (unitFV num) -- Int and Integer are forced in by Num
litOccurrence (HsFrac _)
- = lookupImplicitOccRn fractionalClass_RDR `thenRn_`
- lookupImplicitOccRn ratioDataCon_RDR
+ = lookupImplicitOccRn fractionalClass_RDR `thenRn` \ frac ->
+ lookupImplicitOccRn ratioDataCon_RDR `thenRn` \ ratio ->
+ returnRn (unitFV frac `plusFV` unitFV ratio)
-- We have to make sure that the Ratio type is imported with
-- its constructor, because literals of type Ratio t are
- -- built with that constructor.
+ -- built with that constructor.
+ -- The Rational type is needed too, but that will come in
+ -- when fractionalClass does.
litOccurrence (HsIntPrim _)
- = addImplicitOccRn (getName intPrimTyCon)
+ = returnRn (unitFV (getName intPrimTyCon))
litOccurrence (HsFloatPrim _)
- = addImplicitOccRn (getName floatPrimTyCon)
+ = returnRn (unitFV (getName floatPrimTyCon))
litOccurrence (HsDoublePrim _)
- = addImplicitOccRn (getName doublePrimTyCon)
+ = returnRn (unitFV (getName doublePrimTyCon))
litOccurrence (HsLitLit _)
- = lookupImplicitOccRn ccallableClass_RDR
+ = lookupImplicitOccRn ccallableClass_RDR `thenRn` \ cc ->
+ returnRn (unitFV cc)
\end{code}
+%************************************************************************
+%* *
+\subsubsection{Assertion utils}
+%* *
+%************************************************************************
+
+\begin{code}
+mkAssertExpr :: RnMS (RenamedHsExpr, FreeVars)
+mkAssertExpr =
+ mkImportedGlobalFromRdrName assertErr_RDR `thenRn` \ name ->
+ getSrcLocRn `thenRn` \ sloc ->
+
+ -- if we're ignoring asserts, return (\ _ e -> e)
+ -- if not, return (assertError "src-loc")
+
+ if opt_IgnoreAsserts then
+ getUniqRn `thenRn` \ uniq ->
+ let
+ vname = mkSysLocalName uniq SLIT("v")
+ expr = HsLam ignorePredMatch
+ loc = nameSrcLoc vname
+ ignorePredMatch = Match [] [WildPatIn, VarPatIn vname] Nothing
+ (GRHSs [GRHS [ExprStmt (HsVar vname) loc] loc]
+ EmptyBinds Nothing)
+ in
+ returnRn (expr, unitFV name)
+ else
+ let
+ expr =
+ HsApp (HsVar name)
+ (HsLit (HsString (_PK_ (showSDoc (ppr sloc)))))
+
+ in
+ returnRn (expr, unitFV name)
+
+\end{code}
%************************************************************************
%* *
%************************************************************************
\begin{code}
-dupFieldErr str (dup:rest) sty
- = hcat [ptext SLIT("duplicate field name `"),
- ppr sty dup,
- ptext SLIT("' in record "), text str]
+dupFieldErr str (dup:rest)
+ = hsep [ptext SLIT("duplicate field name"),
+ quotes (ppr dup),
+ ptext SLIT("in record"), text str]
-negPatErr pat sty
- = sep [ptext SLIT("prefix `-' not applied to literal in pattern"), ppr sty pat]
+negPatErr pat
+ = sep [ptext SLIT("prefix `-' not applied to literal in pattern"), quotes (ppr pat)]
-precParseNegPatErr op sty
+precParseNegPatErr op
= hang (ptext SLIT("precedence parsing error"))
- 4 (hcat [ptext SLIT("prefix `-' has lower precedence than "),
- pp_op sty op,
- ptext SLIT(" in pattern")])
+ 4 (hsep [ptext SLIT("prefix `-' has lower precedence than"),
+ pp_op op,
+ ptext SLIT("in pattern")])
-precParseErr op1 op2 sty
+precParseErr op1 op2
= hang (ptext SLIT("precedence parsing error"))
- 4 (hcat [ptext SLIT("cannot mix "), pp_op sty op1, ptext SLIT(" and "), pp_op sty op2,
- ptext SLIT(" in the same infix expression")])
+ 4 (hsep [ptext SLIT("cannot mix"), pp_op op1, ptext SLIT("and"),
+ pp_op op2,
+ ptext SLIT("in the same infix expression")])
+
+nonStdGuardErr guard
+ = hang (ptext
+ SLIT("accepting non-standard pattern guards (-fglasgow-exts to suppress this message)")
+ ) 4 (ppr guard)
+
+patSigErr ty
+ = (ptext SLIT("Illegal signature in pattern:") <+> ppr ty)
+ $$ nest 4 (ptext SLIT("Use -fglasgow-exts to permit it"))
-nonStdGuardErr guard sty
- = hang (ptext SLIT("accepting non-standard pattern guards (-fglasgow-exts to suppress this message)"))
- 4 (ppr sty guard)
+pp_op (op, fix) = hcat [quotes (ppr op), space, parens (ppr fix)]
-pp_op sty (op, fix) = hcat [ppr sty op, space, parens (ppr sty fix)]
+patSynErr e
+ = sep [ptext SLIT("Pattern syntax in expression context:"),
+ nest 4 (ppr e)]
\end{code}
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