import StgSyn
-import Bag ( Bag, emptyBag, isEmptyBag, snocBag, foldBag )
-import Id ( Id, idType )
+import Bag ( Bag, emptyBag, isEmptyBag, snocBag )
+import Id ( Id, idType, isLocalId )
import VarSet
-import DataCon ( DataCon, dataConArgTys, dataConType )
-import Const ( literalType, conType, Literal )
+import DataCon ( DataCon, dataConArgTys, dataConRepType )
+import PrimOp ( primOpType )
+import Literal ( literalType, Literal )
import Maybes ( catMaybes )
-import Name ( isLocallyDefined, getSrcLoc )
+import Name ( getSrcLoc )
import ErrUtils ( ErrMsg, Message, addErrLocHdrLine, pprBagOfErrors, dontAddErrLoc )
-import Type ( mkFunTys, splitFunTys, splitAlgTyConApp_maybe,
+import Type ( mkFunTys, splitFunTys, splitTyConApp_maybe,
isUnLiftedType, isTyVarTy, splitForAllTys, Type
)
-import TyCon ( TyCon, isDataTyCon )
+import TyCon ( TyCon, isDataTyCon, tyConDataCons )
import Util ( zipEqual )
import Outputable
(a) *some* type errors
(b) locally-defined variables used but not defined
+
+Note: unless -dverbose-stg is on, display of lint errors will result
+in "panic: bOGUS_LVs".
+
+WARNING:
+~~~~~~~~
+
+This module has suffered bit-rot; it is likely to yield lint errors
+for Stg code that is currently perfectly acceptable for code
+generation. Solution: don't use it! (KSW 2000-05).
+
+
%************************************************************************
%* *
\subsection{``lint'' for various constructs}
\begin{code}
lintStgArg :: StgArg -> LintM (Maybe Type)
-lintStgArg (StgConArg con) = returnL (Just (conType con))
+lintStgArg (StgLitArg lit) = returnL (Just (literalType lit))
lintStgArg (StgVarArg v) = lintStgVar v
lintStgVar v = checkInScope v `thenL_`
\begin{code}
lintStgBinds :: StgBinding -> LintM [Id] -- Returns the binders
-lintStgBinds (StgNonRec binder rhs)
+lintStgBinds (StgNonRec _srt binder rhs)
= lint_binds_help (binder,rhs) `thenL_`
returnL [binder]
-lintStgBinds (StgRec pairs)
+lintStgBinds (StgRec _srt pairs)
= addInScopeVars binders (
mapL lint_binds_help pairs `thenL_`
returnL binders
\begin{code}
lintStgRhs :: StgRhs -> LintM (Maybe Type)
-lintStgRhs (StgRhsClosure _ _ _ _ _ [] expr)
+lintStgRhs (StgRhsClosure _ _ _ _ [] expr)
= lintStgExpr expr
-lintStgRhs (StgRhsClosure _ _ _ _ _ binders expr)
+lintStgRhs (StgRhsClosure _ _ _ _ binders expr)
= addLoc (LambdaBodyOf binders) (
addInScopeVars binders (
lintStgExpr expr `thenMaybeL` \ body_ty ->
Nothing -> returnL Nothing
Just arg_tys -> checkFunApp con_ty arg_tys (mkRhsConMsg con_ty arg_tys)
where
- con_ty = dataConType con
+ con_ty = dataConRepType con
\end{code}
\begin{code}
lintStgExpr :: StgExpr -> LintM (Maybe Type) -- Nothing if error found
+lintStgExpr (StgLit l) = returnL (Just (literalType l))
+
lintStgExpr e@(StgApp fun args)
= lintStgVar fun `thenMaybeL` \ fun_ty ->
mapMaybeL lintStgArg args `thenL` \ maybe_arg_tys ->
Nothing -> returnL Nothing
Just arg_tys -> checkFunApp fun_ty arg_tys (mkFunAppMsg fun_ty arg_tys e)
-lintStgExpr e@(StgCon con args _)
+lintStgExpr e@(StgConApp con args)
= mapMaybeL lintStgArg args `thenL` \ maybe_arg_tys ->
case maybe_arg_tys of
Nothing -> returnL Nothing
Just arg_tys -> checkFunApp con_ty arg_tys (mkFunAppMsg con_ty arg_tys e)
where
- con_ty = conType con
+ con_ty = dataConRepType con
+
+lintStgExpr e@(StgOpApp (StgFCallOp _ _) args res_ty)
+ = -- We don't have enough type information to check
+ -- the application; ToDo
+ mapMaybeL lintStgArg args `thenL` \ maybe_arg_tys ->
+ returnL (Just res_ty)
+
+lintStgExpr e@(StgOpApp (StgPrimOp op) args _)
+ = mapMaybeL lintStgArg args `thenL` \ maybe_arg_tys ->
+ case maybe_arg_tys of
+ Nothing -> returnL Nothing
+ Just arg_tys -> checkFunApp op_ty arg_tys (mkFunAppMsg op_ty arg_tys e)
+ where
+ op_ty = primOpType op
lintStgExpr (StgLam _ bndrs _)
= addErrL (ptext SLIT("Unexpected StgLam") <+> ppr bndrs) `thenL_`
lintStgExpr e@(StgCase scrut _ _ bndr _ alts)
= lintStgExpr scrut `thenMaybeL` \ _ ->
- checkTys (idType bndr) scrut_ty (mkDefltMsg bndr) `thenL_`
+ (case alts of
+ StgPrimAlts tc _ _ -> check_bndr tc
+ StgAlgAlts (Just tc) _ _ -> check_bndr tc
+ StgAlgAlts Nothing _ _ -> returnL ()
+ ) `thenL_`
+
(trace (showSDoc (ppr e)) $
-- we only allow case of tail-call or primop.
(case scrut of
- StgApp _ _ -> returnL ()
- StgCon _ _ _ -> returnL ()
+ StgApp _ _ -> returnL ()
+ StgConApp _ _ -> returnL ()
other -> addErrL (mkCaseOfCaseMsg e)) `thenL_`
addInScopeVars [bndr] (lintStgAlts alts scrut_ty)
- )
+ )
where
- scrut_ty = get_ty alts
-
- get_ty (StgAlgAlts ty _ _) = ty
- get_ty (StgPrimAlts ty _ _) = ty
+ scrut_ty = idType bndr
+ bad_bndr = mkDefltMsg bndr
+ check_bndr tc = case splitTyConApp_maybe scrut_ty of
+ Just (bndr_tc, _) -> checkL (tc == bndr_tc) bad_bndr
+ Nothing -> addErrL bad_bndr
\end{code}
\begin{code}
check ty = checkTys first_ty ty (mkCaseAltMsg alts)
lintAlgAlt scrut_ty (con, args, _, rhs)
- = (case splitAlgTyConApp_maybe scrut_ty of
- Nothing ->
- addErrL (mkAlgAltMsg1 scrut_ty)
- Just (tycon, tys_applied, cons) ->
+ = (case splitTyConApp_maybe scrut_ty of
+ Just (tycon, tys_applied) | isDataTyCon tycon ->
let
+ cons = tyConDataCons tycon
arg_tys = dataConArgTys con tys_applied
-- This almost certainly does not work for existential constructors
in
`thenL_`
mapL check (zipEqual "lintAlgAlt:stg" arg_tys args) `thenL_`
returnL ()
+ other ->
+ addErrL (mkAlgAltMsg1 scrut_ty)
) `thenL_`
addInScopeVars args (
lintStgExpr rhs
= errs_so_far `snocBag` mk_msg locs
where
mk_msg (loc:_) = let (l,hdr) = dumpLoc loc in addErrLocHdrLine l hdr msg
- mk_msg [] = dontAddErrLoc "" msg
+ mk_msg [] = dontAddErrLoc msg
addLoc :: LintLocInfo -> LintM a -> LintM a
addLoc extra_loc m loc scope errs
-- a real error out of it...
let
new_set = mkVarSet ids
-
- shadowed = scope `intersectVarSet` new_set
in
-- After adding -fliberate-case, Simon decided he likes shadowed
-- names after all. WDP 94/07
checkFunApp fun_ty arg_tys msg loc scope errs
= cfa res_ty expected_arg_tys arg_tys
where
- (_, de_forall_ty) = splitForAllTys fun_ty
+ (_, de_forall_ty) = splitForAllTys fun_ty
(expected_arg_tys, res_ty) = splitFunTys de_forall_ty
cfa res_ty expected [] -- Args have run out; that's fine
\begin{code}
checkInScope :: Id -> LintM ()
checkInScope id loc scope errs
- = if isLocallyDefined id && not (id `elemVarSet` scope) then
+ = if isLocalId id && not (id `elemVarSet` scope) then
((), addErr errs (hsep [ppr id, ptext SLIT("is out of scope")]) loc)
else
((), errs)
projects / ghc-hetmet.git / blobdiff