%
-% (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}
-module DsBinds ( dsBinds, dsMonoBinds ) where
+module DsBinds ( dsMonoBinds, AutoScc(..) ) where
#include "HsVersions.h"
-import {-# SOURCE #-} DsExpr
+
+import {-# SOURCE #-} DsExpr( dsExpr )
import HsSyn -- lots of things
import CoreSyn -- lots of things
import CoreUtils ( coreExprType )
-import TcHsSyn ( TypecheckedHsBinds, TypecheckedHsExpr,
- TypecheckedMonoBinds,
- TypecheckedPat
- )
+import TcHsSyn ( TypecheckedMonoBinds )
import DsMonad
import DsGRHSs ( dsGuarded )
import DsUtils
import Match ( matchWrapper )
-import BasicTypes ( Module, RecFlag(..) )
+import BasicTypes ( RecFlag(..) )
import CmdLineOpts ( opt_SccProfilingOn, opt_AutoSccsOnAllToplevs,
- opt_AutoSccsOnExportedToplevs
+ opt_AutoSccsOnExportedToplevs, opt_AutoSccsOnDicts
)
-import CostCentre ( mkAutoCC, IsCafCC(..), mkAllDictsCC )
+import CostCentre ( CostCentre, mkAutoCC, IsCafCC(..) )
import Id ( idType, Id )
+import VarEnv
import Name ( isExported )
-import Type ( mkTyVarTy, isDictTy, instantiateTy
- )
-import TyVar ( zipTyVarEnv )
-import TysPrim ( voidTy )
-import Outputable ( 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}
+import Type ( mkTyVarTy, isDictTy, substTy )
+import TysWiredIn ( voidTy )
+import Outputable
-dsBinds :: Bool -- if candidate, auto add scc's on toplevs ?
- -> TypecheckedHsBinds
- -> DsM [CoreBinding]
-
-dsBinds _ EmptyBinds = returnDs []
-dsBinds auto_scc (ThenBinds binds_1 binds_2)
- = andDs (++) (dsBinds auto_scc binds_1) (dsBinds auto_scc binds_2)
-
-dsBinds auto_scc (MonoBind binds sigs is_rec)
- = dsMonoBinds auto_scc binds [] `thenDs` \ prs ->
- returnDs (case is_rec of
- Recursive -> [Rec prs]
- NonRecursive -> [NonRec binder rhs | (binder,rhs) <- prs]
- )
+import Maybe
+import IOExts (trace)
\end{code}
-
%************************************************************************
%* *
\subsection[dsMonoBinds]{Desugaring a @MonoBinds@}
%************************************************************************
\begin{code}
-dsMonoBinds :: Bool -- False => don't (auto-)annotate scc on toplevs.
+dsMonoBinds :: AutoScc -- scc annotation policy (see below)
-> TypecheckedMonoBinds
-> [(Id,CoreExpr)] -- Put this on the end (avoid quadratic append)
-> DsM [(Id,CoreExpr)] -- Result
dsMonoBinds auto_scc (FunMonoBind fun _ matches locn) rest
= putSrcLocDs locn $
matchWrapper (FunMatch fun) matches error_string `thenDs` \ (args, body) ->
- addAutoScc auto_scc (fun, mkValLam args body) `thenDs` \ pair ->
+ addAutoScc auto_scc (fun, mkLams args body) `thenDs` \ pair ->
returnDs (pair : rest)
where
- error_string = "function " ++ showForErr fun
+ error_string = "function " ++ showSDoc (ppr fun)
-dsMonoBinds _ (PatMonoBind pat grhss_and_binds locn) rest
+dsMonoBinds auto_scc (PatMonoBind pat grhss locn) rest
= putSrcLocDs locn $
- dsGuarded grhss_and_binds `thenDs` \ body_expr ->
- mkSelectorBinds pat body_expr `thenDs` \ sel_binds ->
+ dsGuarded grhss `thenDs` \ body_expr ->
+ mkSelectorBinds pat body_expr `thenDs` \ sel_binds ->
+ mapDs (addAutoScc auto_scc) sel_binds `thenDs` \ sel_binds ->
returnDs (sel_binds ++ rest)
- -- Common special case: no type or dictionary abstraction
-dsMonoBinds auto_scc (AbsBinds [] [] exports binds) rest
- = mapDs (addAutoScc auto_scc) [(global, Var local) | (_, global, local) <- exports] `thenDs` \ exports' ->
- dsMonoBinds False binds (exports' ++ rest)
-
- -- Another common case: one exported variable
+ -- Common case: one exported variable
-- All non-recursive bindings come through this way
-dsMonoBinds auto_scc (AbsBinds all_tyvars dicts [(tyvars, global, local)] binds) rest
+dsMonoBinds auto_scc (AbsBinds all_tyvars dicts exps@[(tyvars, global, local)] binds) rest
= ASSERT( all (`elem` tyvars) all_tyvars )
- dsMonoBinds False binds [] `thenDs` \ core_prs ->
+ dsMonoBinds (addSccs auto_scc exps) binds [] `thenDs` \ core_prs ->
let
-- Always treat the binds as recursive, because the typechecker
-- makes rather mixed-up dictionary bindings
core_binds = [Rec core_prs]
+ global' = (global, mkLams tyvars $ mkLams dicts $
+ mkLets core_binds (Var local))
in
- addAutoScc auto_scc (global, mkLam tyvars dicts $
- mkCoLetsAny core_binds (Var local)) `thenDs` \ global' ->
+
returnDs (global' : rest)
+ -- Another Common special case: no type or dictionary abstraction
+dsMonoBinds auto_scc (AbsBinds [] [] exports binds) rest
+ = let exports' = [(global, Var local) | (_, global, local) <- exports] in
+ dsMonoBinds (addSccs auto_scc exports) binds (exports' ++ rest)
+
dsMonoBinds auto_scc (AbsBinds all_tyvars dicts exports binds) rest
- = dsMonoBinds False binds [] `thenDs` \ core_prs ->
+ = dsMonoBinds (addSccs auto_scc exports) binds []`thenDs` \ core_prs ->
let
core_binds = [Rec core_prs]
- tup_expr = mkLam all_tyvars dicts $
- mkCoLetsAny core_binds $
- mkTupleExpr locals
- locals = [local | (_, _, local) <- exports]
- local_tys = map idType locals
+ tup_expr = mkTupleExpr locals
+ tup_ty = coreExprType tup_expr
+ poly_tup_expr = mkLams all_tyvars $ mkLams dicts $
+ mkLets core_binds tup_expr
+ locals = [local | (_, _, local) <- exports]
+ local_tys = map idType locals
in
- newSysLocalDs (coreExprType tup_expr) `thenDs` \ tup_id ->
+ newSysLocalDs (coreExprType 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
= -- 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' ->
- addAutoScc auto_scc
- (global, mkLam tyvars dicts $
- mkTupleSelector locals' (locals' !! n) $
- mkValApp (mkTyApp (Var tup_id) ty_args) dict_args)
+ newSysLocalsDs (map (substTy env) local_tys) `thenDs` \ locals' ->
+ newSysLocalDs (substTy env 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 `zipTyVarEnv` ty_args
+ env = all_tyvars `zipVarEnv` ty_args
in
zipWithDs mk_bind exports [0..] `thenDs` \ export_binds ->
-- don't scc (auto-)annotate the tuple itself.
- returnDs ((tup_id, tup_expr) : (export_binds ++ rest))
+ returnDs ((poly_tup_id, poly_tup_expr) : (export_binds ++ rest))
\end{code}
%************************************************************************
\begin{code}
-addAutoScc :: Bool -- if needs be, decorate toplevs?
+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 ||
+ (isExported exp &&
+ opt_AutoSccsOnExportedToplevs)
+ -> Just exp
+ _ -> Nothing)
+
+addAutoScc :: AutoScc -- if needs be, decorate toplevs?
-> (Id, CoreExpr)
-> DsM (Id, CoreExpr)
-addAutoScc auto_scc_candidate pair@(bndr, core_expr)
- | auto_scc_candidate && worthSCC core_expr &&
- (opt_AutoSccsOnAllToplevs || (isExported bndr && opt_AutoSccsOnExportedToplevs))
+addAutoScc (TopLevelAddSccs auto_scc_fn) pair@(bndr, core_expr)
+ | do_auto_scc && worthSCC core_expr
= getModuleAndGroupDs `thenDs` \ (mod,grp) ->
- returnDs (bndr, Note (SCC (mkAutoCC bndr mod grp IsNotCafCC)) core_expr)
- | otherwise
+ returnDs (bndr, Note (SCC (mkAutoCC top_bndr mod grp 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
worthSCC (Note (SCC _) _) = False
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
| otherwise
= getModuleAndGroupDs `thenDs` \ (mod, grp) ->
-
-- ToDo: do -dicts-all flag (mark dict things with individual CCs)
returnDs (Note (SCC (mkAllDictsCC mod grp False)) rhs)
+-}
\end{code}
projects / ghc-hetmet.git / blobdiff