%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[DsBinds]{Pattern-matching bindings (HsBinds and MonoBinds)}
lower levels it is preserved with @let@/@letrec@s).
\begin{code}
-#include "HsVersions.h"
+module DsBinds ( dsHsBinds, AutoScc(..) ) where
-module DsBinds ( dsBinds ) where
+#include "HsVersions.h"
-IMP_Ubiq()
-#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ <= 201
-IMPORT_DELOOPER(DsLoop) -- break dsExpr-ish loop
-#else
-import {-# SOURCE #-} DsExpr
-#endif
-import HsSyn -- lots of things
-import CoreSyn -- lots of things
-import CoreUtils ( coreExprType )
-import TcHsSyn ( SYN_IE(TypecheckedHsBinds), SYN_IE(TypecheckedHsExpr),
- SYN_IE(TypecheckedMonoBinds),
- SYN_IE(TypecheckedPat)
- )
+import {-# SOURCE #-} DsExpr( dsLExpr )
import DsMonad
import DsGRHSs ( dsGuarded )
import DsUtils
-import Match ( matchWrapper )
-
-import BasicTypes ( SYN_IE(Module) )
-import CmdLineOpts ( opt_SccProfilingOn, opt_AutoSccsOnAllToplevs,
- opt_AutoSccsOnExportedToplevs, opt_CompilingGhcInternals )
-import CostCentre ( mkAutoCC, IsCafCC(..), mkAllDictsCC, preludeDictsCostCentre )
-import Id ( idType, SYN_IE(DictVar), GenId, SYN_IE(Id) )
-import ListSetOps ( minusList, intersectLists )
-import Name ( isExported )
-import PprType ( GenType )
-import Outputable ( PprStyle(..) )
-import Type ( mkTyVarTy, isDictTy, instantiateTy
- )
-import TyVar ( tyVarSetToList, GenTyVar{-instance Eq-} )
-import TysPrim ( voidTy )
-import Util ( isIn, panic, assertPanic )
-\end{code}
-
-%************************************************************************
-%* *
-\subsection[toplevel-and-regular-DsBinds]{Regular and top-level @dsBinds@}
-%* *
-%************************************************************************
-
-Like @dsBinds@, @dsBind@ returns a @[CoreBinding]@, but it may be
-that some of the binders are of unboxed type. This is sorted out when
-the caller wraps the bindings round an expression.
-
-\begin{code}
-type Group = FAST_STRING
-
-dsBinds :: Maybe (Module, Group) -> TypecheckedHsBinds -> DsM [CoreBinding]
-dsBinds _ EmptyBinds = returnDs []
-dsBinds mb_mod_grp (ThenBinds binds_1 binds_2)
- = andDs (++) (dsBinds mb_mod_grp binds_1) (dsBinds mb_mod_grp binds_2)
+import HsSyn -- lots of things
+import CoreSyn -- lots of things
+import CoreUtils ( exprType, mkInlineMe, mkSCC )
+import Match ( matchWrapper )
-dsBinds mb_mod_grp (MonoBind binds sigs is_rec)
- = dsMonoBinds mb_mod_grp is_rec binds `thenDs` \ prs ->
- returnDs (if is_rec then
- [Rec prs]
- else
- [NonRec binder rhs | (binder,rhs) <- prs]
- )
+import CmdLineOpts ( opt_AutoSccsOnAllToplevs, opt_AutoSccsOnExportedToplevs )
+import CostCentre ( mkAutoCC, IsCafCC(..) )
+import Id ( idType, idName, isExportedId, isSpecPragmaId, Id )
+import NameSet
+import VarSet
+import TcType ( mkTyVarTy )
+import Subst ( substTyWith )
+import TysWiredIn ( voidTy )
+import Outputable
+import SrcLoc ( Located(..) )
+import Maybe ( isJust )
+import Bag ( Bag, bagToList )
+
+import Monad ( foldM )
\end{code}
-
%************************************************************************
%* *
\subsection[dsMonoBinds]{Desugaring a @MonoBinds@}
%************************************************************************
\begin{code}
-dsMonoBinds :: Maybe (Module, Group) -- Nothing => don't (auto-)annotate scc on toplevs.
- -> RecFlag
- -> TypecheckedMonoBinds
- -> DsM [(Id,CoreExpr)]
+dsHsBinds :: AutoScc -- scc annotation policy (see below)
+ -> Bag (LHsBind Id)
+ -> [(Id,CoreExpr)] -- Put this on the end (avoid quadratic append)
+ -> DsM [(Id,CoreExpr)] -- Result
-dsMonoBinds _ is_rec EmptyMonoBinds = returnDs []
+dsHsBinds auto_scc binds rest =
+ foldM (dsLHsBind auto_scc) rest (bagToList binds)
-dsMonoBinds mb_mod_grp is_rec (AndMonoBinds binds_1 binds_2)
- = andDs (++) (dsMonoBinds mb_mod_grp is_rec binds_1) (dsMonoBinds mb_mod_grp is_rec binds_2)
+dsLHsBind :: AutoScc
+ -> [(Id,CoreExpr)] -- Put this on the end (avoid quadratic append)
+ -> LHsBind Id
+ -> DsM [(Id,CoreExpr)] -- Result
+dsLHsBind auto_scc rest (L loc bind)
+ = putSrcSpanDs loc $ dsHsBind auto_scc rest bind
-dsMonoBinds _ is_rec (CoreMonoBind var core_expr)
- = returnDs [(var, core_expr)]
+dsHsBind :: AutoScc
+ -> [(Id,CoreExpr)] -- Put this on the end (avoid quadratic append)
+ -> HsBind Id
+ -> DsM [(Id,CoreExpr)] -- Result
-dsMonoBinds _ is_rec (VarMonoBind var expr)
- = dsExpr expr `thenDs` \ core_expr ->
+dsHsBind auto_scc rest (VarBind var expr)
+ = dsLExpr expr `thenDs` \ core_expr ->
-- Dictionary bindings are always VarMonoBinds, so
-- we only need do this here
addDictScc var core_expr `thenDs` \ core_expr' ->
- returnDs [(var, core_expr')]
-
-dsMonoBinds mb_mod_grp is_rec (FunMonoBind fun _ matches locn)
- = putSrcLocDs locn $
- matchWrapper (FunMatch fun) matches error_string `thenDs` \ (args, body) ->
- returnDs [addAutoScc mb_mod_grp (fun, mkValLam args body)]
- where
- error_string = "function " ++ showForErr fun
-
-dsMonoBinds mb_mod_grp is_rec (PatMonoBind pat grhss_and_binds locn)
- = putSrcLocDs locn $
- dsGuarded grhss_and_binds `thenDs` \ body_expr ->
- mkSelectorBinds pat body_expr
+ let
+ -- Gross hack to prevent inlining into SpecPragmaId rhss
+ -- Consider fromIntegral = fromInteger . toInteger
+ -- spec1 = fromIntegral Int Float
+ -- Even though fromIntegral is small we don't want to inline
+ -- it inside spec1, so that we collect the specialised call
+ -- Solution: make spec1 an INLINE thing.
+ core_expr'' = mkInline (isSpecPragmaId var) core_expr'
+ in
+
+ returnDs ((var, core_expr'') : rest)
+
+dsHsBind auto_scc rest (FunBind (L _ fun) _ matches)
+ = matchWrapper (FunRhs (idName fun)) matches `thenDs` \ (args, body) ->
+ addAutoScc auto_scc (fun, mkLams args body) `thenDs` \ pair ->
+ returnDs (pair : rest)
+
+dsHsBind auto_scc rest (PatBind pat grhss)
+ = dsGuarded grhss `thenDs` \ body_expr ->
+ mkSelectorBinds pat body_expr `thenDs` \ sel_binds ->
+ mappM (addAutoScc auto_scc) sel_binds `thenDs` \ sel_binds ->
+ returnDs (sel_binds ++ rest)
-- Common special case: no type or dictionary abstraction
-dsMonoBinds mb_mod_grp is_rec (AbsBinds [] [] exports binds)
- = dsMonoBinds Nothing is_rec binds `thenDs` \ prs ->
- returnDs (prs ++ [ addAutoScc mb_mod_grp (global, Var local) | (_, global, local) <- exports])
+ -- For the (rare) case when there are some mixed-up
+ -- dictionary bindings (for which a Rec is convenient)
+ -- we reply on the enclosing dsBind to wrap a Rec around.
+dsHsBind auto_scc rest (AbsBinds [] [] exports inlines binds)
+ = dsHsBinds (addSccs auto_scc exports) binds []`thenDs` \ core_prs ->
+ let
+ core_prs' = addLocalInlines exports inlines core_prs
+ exports' = [(global, Var local) | (_, global, local) <- exports]
+ in
+ returnDs (core_prs' ++ exports' ++ rest)
-- Another common case: one exported variable
- -- All non-recursive bindings come through this way
-dsMonoBinds mb_mod_grp is_rec (AbsBinds all_tyvars dicts [(tyvars, global, local)] binds)
+ -- Non-recursive bindings come through this way
+dsHsBind auto_scc rest
+ (AbsBinds all_tyvars dicts exps@[(tyvars, global, local)] inlines binds)
= ASSERT( all (`elem` tyvars) all_tyvars )
- dsMonoBinds Nothing is_rec binds `thenDs` \ core_prs ->
+ dsHsBinds (addSccs auto_scc exps) binds [] `thenDs` \ core_prs ->
let
- core_binds | is_rec = [Rec core_prs]
- | otherwise = [NonRec b e | (b,e) <- core_prs]
+ -- Always treat the binds as recursive, because the typechecker
+ -- makes rather mixed-up dictionary bindings
+ core_bind = Rec core_prs
+
+ -- The mkInline does directly what the
+ -- addLocalInlines do in the other cases
+ export' = (global, mkInline (idName global `elemNameSet` inlines) $
+ mkLams tyvars $ mkLams dicts $
+ Let core_bind (Var local))
in
- returnDs [addAutoScc mb_mod_grp (global, mkLam tyvars dicts $
- mkCoLetsAny core_binds (Var local))]
+ returnDs (export' : rest)
-dsMonoBinds mb_mod_grp is_rec (AbsBinds all_tyvars dicts exports binds)
- = dsMonoBinds Nothing is_rec binds `thenDs` \ core_prs ->
+dsHsBind auto_scc rest (AbsBinds all_tyvars dicts exports inlines binds)
+ = dsHsBinds (addSccs auto_scc exports) binds []`thenDs` \ core_prs ->
let
- core_binds | is_rec = [Rec core_prs]
- | otherwise = [NonRec b e | (b,e) <- core_prs]
-
- tup_expr = mkLam all_tyvars dicts $
- mkCoLetsAny core_binds $
- mkTupleExpr locals
- locals = [local | (_, _, local) <- exports]
- local_tys = map idType locals
+ -- Rec because of mixed-up dictionary bindings
+ core_bind = Rec (addLocalInlines exports inlines core_prs)
+
+ tup_expr = mkTupleExpr locals
+ tup_ty = exprType tup_expr
+ poly_tup_expr = mkLams all_tyvars $ mkLams dicts $
+ Let core_bind tup_expr
+ locals = [local | (_, _, local) <- exports]
+ local_tys = map idType locals
in
- newSysLocalDs (coreExprType tup_expr) `thenDs` \ tup_id ->
+ newSysLocalDs (exprType poly_tup_expr) `thenDs` \ poly_tup_id ->
let
- dict_args = map VarArg dicts
+ dict_args = map Var dicts
- mk_bind (tyvars, global, local) n -- locals !! n == local
+ mk_bind ((tyvars, global, local), n) -- locals !! n == local
= -- Need to make fresh locals to bind in the selector, because
-- some of the tyvars will be bound to voidTy
- newSysLocalsDs (map (instantiateTy env) local_tys) `thenDs` \ locals' ->
- returnDs (addAutoScc mb_mod_grp $
- (global, mkLam tyvars dicts $
- mkTupleSelector locals' (locals' !! n) $
- mkValApp (mkTyApp (Var tup_id) ty_args) dict_args))
+ newSysLocalsDs (map substitute local_tys) `thenDs` \ locals' ->
+ newSysLocalDs (substitute tup_ty) `thenDs` \ tup_id ->
+ returnDs (global, mkLams tyvars $ mkLams dicts $
+ mkTupleSelector locals' (locals' !! n) tup_id $
+ mkApps (mkTyApps (Var poly_tup_id) ty_args) dict_args)
where
mk_ty_arg all_tyvar | all_tyvar `elem` tyvars = mkTyVarTy all_tyvar
| otherwise = voidTy
- ty_args = map mk_ty_arg all_tyvars
- env = all_tyvars `zip` ty_args
+ ty_args = map mk_ty_arg all_tyvars
+ substitute = substTyWith all_tyvars ty_args
in
- zipWithDs mk_bind exports [0..] `thenDs` \ export_binds ->
+ mappM mk_bind (exports `zip` [0..]) `thenDs` \ export_binds ->
-- don't scc (auto-)annotate the tuple itself.
- returnDs ((tup_id, tup_expr) : export_binds)
+ returnDs ((poly_tup_id, poly_tup_expr) : (export_binds ++ rest))
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Adding inline pragmas}
+%* *
+%************************************************************************
+
+\begin{code}
+mkInline :: Bool -> CoreExpr -> CoreExpr
+mkInline True body = mkInlineMe body
+mkInline False body = body
+
+addLocalInlines :: [(a, Id, Id)] -> NameSet -> [(Id,CoreExpr)] -> [(Id,CoreExpr)]
+addLocalInlines exports inlines pairs
+ = [(bndr, mkInline (bndr `elemVarSet` local_inlines) rhs) | (bndr,rhs) <- pairs]
+ where
+ local_inlines = mkVarSet [l | (_,g,l) <- exports, idName g `elemNameSet` inlines]
\end{code}
%************************************************************************
\begin{code}
-addAutoScc :: Maybe (Module, Group) -- Module and group
- -> (Id, CoreExpr)
+data AutoScc
+ = TopLevel
+ | TopLevelAddSccs (Id -> Maybe Id)
+ | NoSccs
+
+addSccs :: AutoScc -> [(a,Id,Id)] -> AutoScc
+addSccs auto_scc@(TopLevelAddSccs _) exports = auto_scc
+addSccs NoSccs exports = NoSccs
+addSccs TopLevel exports
+ = TopLevelAddSccs (\id -> case [ exp | (_,exp,loc) <- exports, loc == id ] of
+ (exp:_) | opt_AutoSccsOnAllToplevs ||
+ (isExportedId exp &&
+ opt_AutoSccsOnExportedToplevs)
+ -> Just exp
+ _ -> Nothing)
+
+addAutoScc :: AutoScc -- if needs be, decorate toplevs?
-> (Id, CoreExpr)
-
-addAutoScc mb_mod_grp pair@(bndr, core_expr)
- = case mb_mod_grp of
- Just (mod,grp)
- | worthSCC core_expr &&
- (opt_AutoSccsOnAllToplevs ||
- (isExported bndr && opt_AutoSccsOnExportedToplevs))
- -> (bndr, SCC (mkAutoCC bndr mod grp IsNotCafCC) core_expr)
- _ -> pair -- no auto-annotation.
-
-worthSCC (SCC _ _) = False
-worthSCC (Con _ _) = False
-worthSCC core_expr = True
+ -> DsM (Id, CoreExpr)
+
+addAutoScc (TopLevelAddSccs auto_scc_fn) pair@(bndr, core_expr)
+ | do_auto_scc
+ = getModuleDs `thenDs` \ mod ->
+ returnDs (bndr, mkSCC (mkAutoCC top_bndr mod NotCafCC) core_expr)
+ where do_auto_scc = isJust maybe_auto_scc
+ maybe_auto_scc = auto_scc_fn bndr
+ (Just top_bndr) = maybe_auto_scc
+
+addAutoScc _ pair
+ = returnDs pair
\end{code}
-If profiling and dealing with a dict binding, wrap the dict in "_scc_ DICT <dict>":
+If profiling and dealing with a dict binding,
+wrap the dict in @_scc_ DICT <dict>@:
\begin{code}
-addDictScc var rhs
- | not ( opt_SccProfilingOn || opt_AutoSccsOnAllToplevs)
- -- the latter is so that -unprof-auto-scc-all adds dict sccs
+addDictScc var rhs = returnDs rhs
+
+{- DISABLED for now (need to somehow make up a name for the scc) -- SDM
+ | not ( opt_SccProfilingOn && opt_AutoSccsOnDicts)
|| not (isDictTy (idType var))
= returnDs rhs -- That's easy: do nothing
- | opt_CompilingGhcInternals
- = returnDs (SCC prel_dicts_cc rhs)
-
| otherwise
= getModuleAndGroupDs `thenDs` \ (mod, grp) ->
-
-- ToDo: do -dicts-all flag (mark dict things with individual CCs)
- returnDs (SCC (mkAllDictsCC mod grp False) rhs)
-
-prel_dicts_cc = preludeDictsCostCentre False{-not dupd-} -- ditto
+ returnDs (Note (SCC (mkAllDictsCC mod grp False)) rhs)
+-}
\end{code}
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