import CoreSyn -- lots of things
import MkCore
import CoreUtils
-import CoreUnfold
import CoreFVs
import TcHsSyn ( mkArbitraryType ) -- Mis-placed?
import CostCentre
import Module
import Id
+import MkId ( seqId )
import Var ( Var, TyVar )
import VarSet
import Rules
import BasicTypes hiding ( TopLevel )
import FastString
import StaticFlags ( opt_DsMultiTyVar )
-import Util ( mapSnd, count, mapAndUnzip, lengthExceeds )
+import Util ( mapSnd, mapAndUnzip, lengthExceeds )
import Control.Monad
import Data.List
------------------------
ds_lhs_binds :: AutoScc -> LHsBinds Id -> DsM [(Id,CoreExpr)]
-
-- scc annotation policy (see below)
ds_lhs_binds auto_scc binds = foldM (dsLHsBind auto_scc) [] (bagToList binds)
-> HsBind Id
-> DsM [(Id,CoreExpr)] -- Result
-dsHsBind _ rest (VarBind var expr inline_regardless)
- = do { core_expr <- dsLExpr expr
-
- -- Dictionary bindings are always VarBinds,
- -- so we only need do this here
- ; core_expr' <- addDictScc var core_expr
- ; let var' | inline_regardless = var `setIdUnfolding` mkCompulsoryUnfolding core_expr'
- | otherwise = var
+dsHsBind _ rest (VarBind var expr) = do
+ core_expr <- dsLExpr expr
- ; return ((var', core_expr') : rest) }
+ -- Dictionary bindings are always VarMonoBinds, so
+ -- we only need do this here
+ core_expr' <- addDictScc var core_expr
+ return ((var, core_expr') : rest)
-dsHsBind _ rest
- (FunBind { fun_id = L _ fun, fun_matches = matches,
- fun_co_fn = co_fn, fun_tick = tick, fun_infix = inf })
- = do { (args, body) <- matchWrapper (FunRhs (idName fun) inf) matches
- ; body' <- mkOptTickBox tick body
- ; rhs <- dsCoercion co_fn (return (mkLams args body'))
- ; return ((fun,rhs) : rest) }
+dsHsBind _ rest (FunBind { fun_id = L _ fun, fun_matches = matches,
+ fun_co_fn = co_fn, fun_tick = tick, fun_infix = inf }) = do
+ (args, body) <- matchWrapper (FunRhs (idName fun) inf) matches
+ body' <- mkOptTickBox tick body
+ rhs <- dsCoercion co_fn (return (mkLams args body'))
+ return ((fun,rhs) : rest)
-dsHsBind _ rest
- (PatBind { pat_lhs = pat, pat_rhs = grhss, pat_rhs_ty = ty })
- = do { body_expr <- dsGuarded grhss ty
- ; sel_binds <- mkSelectorBinds pat body_expr
- ; return (sel_binds ++ rest) }
+dsHsBind _ rest (PatBind { pat_lhs = pat, pat_rhs = grhss, pat_rhs_ty = ty }) = do
+ body_expr <- dsGuarded grhss ty
+ sel_binds <- mkSelectorBinds pat body_expr
+ return (sel_binds ++ rest)
{- Note [Rules and inlining]
~~~~~~~~~~~~~~~~~~~~~~~~~
dsHsBind auto_scc rest (AbsBinds [] [] exports binds)
= do { core_prs <- ds_lhs_binds NoSccs binds
; let env = mkABEnv exports
- ar_env = mkArityEnv binds
- do_one (lcl_id, rhs)
- | Just (_, gbl_id, _, prags) <- lookupVarEnv env lcl_id
- = makeCorePair gbl_id (lookupArity ar_env lcl_id) prags $
- addAutoScc auto_scc gbl_id rhs
-
- | otherwise = (lcl_id, rhs)
-
+ do_one (lcl_id, rhs) | Just (_, gbl_id, _, prags) <- lookupVarEnv env lcl_id
+ = addInlinePrags prags gbl_id $
+ addAutoScc auto_scc gbl_id rhs
+ | otherwise = (lcl_id, rhs)
locals' = [(lcl_id, Var gbl_id) | (_, gbl_id, lcl_id, _) <- exports]
-- Note [Rules and inlining]
; return (map do_one core_prs ++ locals' ++ rest) }
where
fvs = exprSomeFreeVars (`elemVarSet` bndrs) rhs
- ar_env = mkArityEnv binds
env = mkABEnv exports
do_one (lcl_id, rhs)
| Just (id_tvs, gbl_id, _, prags) <- lookupVarEnv env lcl_id
- = let rhs' = addAutoScc auto_scc gbl_id $
- mkLams id_tvs $
- mkLets [ NonRec tv (Type (lookupVarEnv_NF arby_env tv))
- | tv <- tyvars, not (tv `elem` id_tvs)] $
- add_lets rhs
- in (NonRec lcl_id (mkTyApps (Var gbl_id) (mkTyVarTys id_tvs)),
- makeCorePair gbl_id (lookupArity ar_env lcl_id) prags rhs')
+ = (NonRec lcl_id (mkTyApps (Var gbl_id) (mkTyVarTys id_tvs)),
+ addInlinePrags prags gbl_id $
+ addAutoScc auto_scc gbl_id $
+ mkLams id_tvs $
+ mkLets [ NonRec tv (Type (lookupVarEnv_NF arby_env tv))
+ | tv <- tyvars, not (tv `elem` id_tvs)] $
+ add_lets rhs)
| otherwise
= (NonRec lcl_id (mkTyApps (Var non_exp_gbl_id) (mkTyVarTys tyvars)),
(non_exp_gbl_id, mkLams tyvars (add_lets rhs)))
-- Another common case: one exported variable
-- Non-recursive bindings come through this way
- -- So do self-recursive bindings, and recursive bindings
- -- that have been chopped up with type signatures
dsHsBind auto_scc rest
(AbsBinds all_tyvars dicts [(tyvars, global, local, prags)] binds)
- = ASSERT( all (`elem` tyvars) all_tyvars )
- do { core_prs <- ds_lhs_binds NoSccs binds
-
- ; let -- Always treat the binds as recursive, because the typechecker
- -- makes rather mixed-up dictionary bindings
- core_bind = Rec core_prs
- inl_arity = lookupArity (mkArityEnv binds) local
+ = ASSERT( all (`elem` tyvars) all_tyvars ) do
+ core_prs <- ds_lhs_binds NoSccs binds
+ let
+ -- Always treat the binds as recursive, because the typechecker
+ -- makes rather mixed-up dictionary bindings
+ core_bind = Rec core_prs
- ; mb_specs <- mapM (dsSpec all_tyvars dicts tyvars global
- local inl_arity core_bind) prags
-
- ; let (spec_binds, rules) = unzip (catMaybes mb_specs)
- global' = addIdSpecialisations global rules
- rhs = addAutoScc auto_scc global $
- mkLams tyvars $ mkLams dicts $ Let core_bind (Var local)
- main_bind = makeCorePair global' (inl_arity + length dicts) prags rhs
+ mb_specs <- mapM (dsSpec all_tyvars dicts tyvars global local core_bind) prags
+ let
+ (spec_binds, rules) = unzip (catMaybes mb_specs)
+ global' = addIdSpecialisations global rules
+ rhs' = mkLams tyvars $ mkLams dicts $ Let core_bind (Var local)
+ bind = addInlinePrags prags global' $ addAutoScc auto_scc global' rhs'
- ; return (main_bind : spec_binds ++ rest) }
+ return (bind : spec_binds ++ rest)
dsHsBind auto_scc rest (AbsBinds all_tyvars dicts exports binds)
= do { core_prs <- ds_lhs_binds NoSccs binds
; let env = mkABEnv exports
- ar_env = mkArityEnv binds
- do_one (lcl_id,rhs) | Just (_, gbl_id, _, _prags) <- lookupVarEnv env lcl_id
- = (lcl_id, addAutoScc auto_scc gbl_id rhs)
+ do_one (lcl_id,rhs) | Just (_, gbl_id, _, prags) <- lookupVarEnv env lcl_id
+ = addInlinePrags prags lcl_id $
+ addAutoScc auto_scc gbl_id rhs
| otherwise = (lcl_id,rhs)
-- Rec because of mixed-up dictionary bindings
locals = [local | (_, _, local, _) <- exports]
local_tys = map idType locals
- inl_prags :: [(Id, SrcSpan)]
- inl_prags = [(id, loc) | (_, id, _, prags) <- exports
- , L loc (InlinePrag {}) <- prags ]
-
- ; mapM_ discardedInlineWarning inl_prags
-
; poly_tup_id <- newSysLocalDs (exprType poly_tup_expr)
; let dict_args = map Var dicts
; let substitute = substTyWith all_tyvars ty_args
; locals' <- newSysLocalsDs (map substitute local_tys)
; tup_id <- newSysLocalDs (substitute tup_ty)
- ; mb_specs <- mapM (dsSpec all_tyvars dicts tyvars global local
- (lookupArity ar_env local) core_bind)
+ ; mb_specs <- mapM (dsSpec all_tyvars dicts tyvars global local core_bind)
prags
; let (spec_binds, rules) = unzip (catMaybes mb_specs)
global' = addIdSpecialisations global rules
| otherwise = dsMkArbitraryType all_tyvar
; export_binds_s <- mapM mk_bind (exports `zip` [0..])
- -- Don't scc (auto-)annotate the tuple itself.
+ -- don't scc (auto-)annotate the tuple itself.
; return ((poly_tup_id, poly_tup_expr) :
(concat export_binds_s ++ rest)) }
-------------------------
-makeCorePair :: Id-> Arity -> [LPrag] -> CoreExpr -> (Id, CoreExpr)
-makeCorePair gbl_id arity prags rhs
- = (addInline gbl_id arity rhs prags, rhs)
-
-------------------------
-discardedInlineWarning :: (Id, SrcSpan) -> DsM ()
-discardedInlineWarning (id, loc)
- = putSrcSpanDs loc $
- warnDs $ sep [ ptext (sLit "Discarding INLINE pragma for") <+> ppr id
- , ptext (sLit "because it is bound by a pattern, or a mutual recursion") ]
-
-------------------------
-type AbsBindEnv = VarEnv ([TyVar], Id, Id, [LPrag])
- -- Maps the "lcl_id" for an AbsBind to
- -- its "gbl_id" and associated pragmas, if any
-
-mkABEnv :: [([TyVar], Id, Id, [LPrag])] -> AbsBindEnv
+mkABEnv :: [([TyVar], Id, Id, [LPrag])] -> VarEnv ([TyVar], Id, Id, [LPrag])
-- Takes the exports of a AbsBinds, and returns a mapping
-- lcl_id -> (tyvars, gbl_id, lcl_id, prags)
mkABEnv exports = mkVarEnv [ (lcl_id, export) | export@(_, _, lcl_id, _) <- exports]
-mkArityEnv :: LHsBinds Id -> IdEnv Arity
- -- Maps a local to the arity of its definition
-mkArityEnv binds = mkVarEnv (mapCatMaybes get_arity (bagToList binds))
- where
- get_arity (L _ (FunBind { fun_id = id, fun_matches = ms })) = Just (unLoc id, matchGroupArity ms)
- get_arity _ = Nothing
-
-lookupArity :: IdEnv Arity -> Id -> Arity
-lookupArity ar_env id = lookupVarEnv ar_env id `orElse` 0
-
-addInline :: Id -> Arity -> CoreExpr -> [LPrag] -> Id
-addInline id arity rhs prags
- = case [inl | L _ (InlinePrag inl) <- prags] of
- [] -> id
- (inl_spec : _) -> addInlineToId id arity rhs inl_spec
-addInlineToId :: Id -> Arity -> CoreExpr -> InlineSpec -> Id
-addInlineToId id inl_arity rhs (Inline phase is_inline)
- = id `setInlinePragma` phase
- `setIdUnfolding` inline_rule
- where
- inline_rule | is_inline = mkInlineRule rhs inl_arity
- | otherwise = noUnfolding
-
-------------------------
dsSpec :: [TyVar] -> [DictId] -> [TyVar]
- -> Id -> Id -> Arity -- Global, local, arity of local
+ -> Id -> Id -- Global, local
-> CoreBind -> LPrag
-> DsM (Maybe ((Id,CoreExpr), -- Binding for specialised Id
CoreRule)) -- Rule for the Global Id
--
-- It is *possible* that 'es' does not mention all of the dictionaries 'ds'
-- (a bit silly, because then the
-dsSpec _ _ _ _ _ _ _ (L _ (InlinePrag {}))
+dsSpec _ _ _ _ _ _ (L _ (InlinePrag {}))
= return Nothing
-dsSpec all_tvs dicts tvs poly_id mono_id inl_arity mono_bind
+dsSpec all_tvs dicts tvs poly_id mono_id mono_bind
(L loc (SpecPrag spec_expr spec_ty inl))
= putSrcSpanDs loc $
do { let poly_name = idName poly_id
-- Very important to make the 'f' non-exported,
-- else it won't be inlined!
spec_id = mkLocalId spec_name spec_ty
- spec_id1 = addInlineToId spec_id (inl_arity + count isDictId bndrs)
- spec_rhs inl
spec_rhs = Let (NonRec local_poly poly_f_body) ds_spec_expr
poly_f_body = mkLams (tvs ++ dicts) f_body
AlwaysActive poly_name
(extra_dict_bndrs ++ bndrs) args
(mkVarApps (Var spec_id) bndrs)
- ; return (Just ((spec_id1, spec_rhs), rule))
+ ; return (Just (addInlineInfo inl spec_id spec_rhs, rule))
} } } }
where
-- Bind to Any any of all_ptvs that aren't
-- a LHS: let f71 = M.f Int in f71
decomp env (Let (NonRec dict rhs) body)
= decomp (extendVarEnv env dict (simpleSubst env rhs)) body
+
+ decomp env (Case scrut bndr ty [(DEFAULT, _, body)])
+ | isDeadBinder bndr -- Note [Matching seqId]
+ = Just (seqId, [Type (idType bndr), Type ty,
+ simpleSubst env scrut, simpleSubst env body])
+
decomp env body
= case collectArgs (simpleSubst env body) of
(Var fn, args) -> Just (fn, args)
go (Let (Rec pairs) body) = Let (Rec (mapSnd go pairs)) (go body)
go (Case scrut bndr ty alts) = Case (go scrut) bndr ty
[(c,bs,go r) | (c,bs,r) <- alts]
+
+addInlinePrags :: [LPrag] -> Id -> CoreExpr -> (Id,CoreExpr)
+addInlinePrags prags bndr rhs
+ = case [inl | L _ (InlinePrag inl) <- prags] of
+ [] -> (bndr, rhs)
+ (inl:_) -> addInlineInfo inl bndr rhs
+
+addInlineInfo :: InlineSpec -> Id -> CoreExpr -> (Id,CoreExpr)
+addInlineInfo (Inline prag is_inline) bndr rhs
+ = (attach_pragma bndr prag, wrap_inline is_inline rhs)
+ where
+ attach_pragma bndr prag
+ | isDefaultInlinePragma prag = bndr
+ | otherwise = bndr `setInlinePragma` prag
+
+ wrap_inline True body = mkInlineMe body
+ wrap_inline False body = body
\end{code}
+Note [Matching seq]
+~~~~~~~~~~~~~~~~~~~
+The desugarer turns (seq e r) into (case e of _ -> r), via a special-case hack
+and this code turns it back into an application of seq!
+See Note [Rules for seq] in MkId for the details.
+
%************************************************************************
%* *
{- An Id -} ; return (App expr (Var v)) }
dsCoercion (WpTyApp ty) thing_inside = do { expr <- thing_inside
; return (App expr (Type ty)) }
+dsCoercion WpInline thing_inside = do { expr <- thing_inside
+ ; return (mkInlineMe expr) }
dsCoercion (WpLet bs) thing_inside = do { prs <- dsLHsBinds bs
; expr <- thing_inside
; return (Let (Rec prs) expr) }
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