lower levels it is preserved with @let@/@letrec@s).
\begin{code}
-#include "HsVersions.h"
-
module DsBinds ( dsBinds, dsMonoBinds ) where
-IMP_Ubiq()
-IMPORT_DELOOPER(DsLoop) -- break dsExpr-ish loop
+#include "HsVersions.h"
+
+import {-# SOURCE #-} DsExpr
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 TcHsSyn ( TypecheckedHsBinds, TypecheckedHsExpr,
+ TypecheckedMonoBinds,
+ TypecheckedPat
)
import DsMonad
import DsGRHSs ( dsGuarded )
import DsUtils
import Match ( matchWrapper )
+import BasicTypes ( Module, RecFlag(..) )
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 )
+ opt_AutoSccsOnExportedToplevs
+ )
+import CostCentre ( mkAutoCC, IsCafCC(..), mkAllDictsCC )
+import Id ( idType, Id )
import Name ( isExported )
-import PprType ( GenType )
-import Outputable ( PprStyle(..) )
import Type ( mkTyVarTy, isDictTy, instantiateTy
)
-import TyVar ( tyVarSetToList, GenTyVar{-instance Eq-} )
+import TyVar ( zipTyVarEnv )
import TysPrim ( voidTy )
-import Util ( isIn, panic, assertPanic )
+import Outputable ( assertPanic )
\end{code}
%************************************************************************
the caller wraps the bindings round an expression.
\begin{code}
-dsBinds :: TypecheckedHsBinds -> DsM [CoreBinding]
-dsBinds EmptyBinds = returnDs []
-dsBinds (ThenBinds binds_1 binds_2) = andDs (++) (dsBinds binds_1) (dsBinds binds_2)
+dsBinds :: Bool -- if candidate, auto add scc's on toplevs ?
+ -> TypecheckedHsBinds
+ -> DsM [CoreBinding]
-dsBinds (MonoBind binds sigs is_rec)
- = dsMonoBinds is_rec binds `thenDs` \ prs ->
- returnDs (if is_rec then
- [Rec prs]
- else
- [NonRec binder rhs | (binder,rhs) <- prs]
+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]
)
\end{code}
%************************************************************************
\begin{code}
-dsMonoBinds :: RecFlag -> TypecheckedMonoBinds -> DsM [(Id,CoreExpr)]
+dsMonoBinds :: Bool -- False => don't (auto-)annotate scc on toplevs.
+ -> TypecheckedMonoBinds
+ -> [(Id,CoreExpr)] -- Put this on the end (avoid quadratic append)
+ -> DsM [(Id,CoreExpr)] -- Result
-dsMonoBinds is_rec EmptyMonoBinds = returnDs []
+dsMonoBinds _ EmptyMonoBinds rest = returnDs rest
-dsMonoBinds is_rec (AndMonoBinds binds_1 binds_2)
- = andDs (++) (dsMonoBinds is_rec binds_1) (dsMonoBinds is_rec binds_2)
+dsMonoBinds auto_scc (AndMonoBinds binds_1 binds_2) rest
+ = dsMonoBinds auto_scc binds_2 rest `thenDs` \ rest' ->
+ dsMonoBinds auto_scc binds_1 rest'
-dsMonoBinds is_rec (CoreMonoBind var core_expr)
- = returnDs [(var, core_expr)]
+dsMonoBinds _ (CoreMonoBind var core_expr) rest
+ = returnDs ((var, core_expr) : rest)
-dsMonoBinds is_rec (VarMonoBind var expr)
+dsMonoBinds _ (VarMonoBind var expr) rest
= dsExpr 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')]
+ returnDs ((var, core_expr') : rest)
-dsMonoBinds is_rec (FunMonoBind fun _ matches locn)
+dsMonoBinds auto_scc (FunMonoBind fun _ matches locn) rest
= putSrcLocDs locn $
matchWrapper (FunMatch fun) matches error_string `thenDs` \ (args, body) ->
- returnDs [(fun, mkValLam args body)]
+ addAutoScc auto_scc (fun, mkValLam args body) `thenDs` \ pair ->
+ returnDs (pair : rest)
where
error_string = "function " ++ showForErr fun
-dsMonoBinds is_rec (PatMonoBind pat grhss_and_binds locn)
+dsMonoBinds _ (PatMonoBind pat grhss_and_binds locn) rest
= putSrcLocDs locn $
- dsGuarded grhss_and_binds `thenDs` \ body_expr ->
- mkSelectorBinds pat body_expr
+ dsGuarded grhss_and_binds `thenDs` \ body_expr ->
+ mkSelectorBinds pat body_expr `thenDs` \ sel_binds ->
+ returnDs (sel_binds ++ rest)
-- Common special case: no type or dictionary abstraction
-dsMonoBinds is_rec (AbsBinds [] [] exports binds)
- = dsMonoBinds is_rec binds `thenDs` \ prs ->
- returnDs (prs ++ [(global, Var local) | (_, global, local) <- exports])
+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
-- All non-recursive bindings come through this way
-dsMonoBinds is_rec (AbsBinds all_tyvars dicts [(tyvars, global, local)] binds)
+dsMonoBinds auto_scc (AbsBinds all_tyvars dicts [(tyvars, global, local)] binds) rest
= ASSERT( all (`elem` tyvars) all_tyvars )
- dsMonoBinds is_rec binds `thenDs` \ core_prs ->
+ dsMonoBinds False 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_binds = [Rec core_prs]
in
- returnDs [(global, mkLam tyvars dicts $ mkCoLetsAny core_binds (Var local))]
+ addAutoScc auto_scc (global, mkLam tyvars dicts $
+ mkCoLetsAny core_binds (Var local)) `thenDs` \ global' ->
+ returnDs (global' : rest)
-dsMonoBinds is_rec (AbsBinds all_tyvars dicts exports binds)
- = dsMonoBinds is_rec binds `thenDs` \ core_prs ->
+dsMonoBinds auto_scc (AbsBinds all_tyvars dicts exports binds) rest
+ = dsMonoBinds False binds [] `thenDs` \ core_prs ->
let
- core_binds | is_rec = [Rec core_prs]
- | otherwise = [NonRec b e | (b,e) <- core_prs]
+ core_binds = [Rec core_prs]
tup_expr = mkLam all_tyvars dicts $
mkCoLetsAny core_binds $
= -- 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 (global, mkLam tyvars dicts $
- mkTupleSelector locals' (locals' !! n) $
- mkValApp (mkTyApp (Var tup_id) ty_args) dict_args)
+ addAutoScc auto_scc
+ (global, mkLam tyvars dicts $
+ mkTupleSelector locals' (locals' !! n) $
+ mkValApp (mkTyApp (Var 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
+ env = all_tyvars `zipTyVarEnv` ty_args
in
zipWithDs mk_bind exports [0..] `thenDs` \ export_binds ->
- returnDs ((tup_id, tup_expr) : export_binds)
+ -- don't scc (auto-)annotate the tuple itself.
+ returnDs ((tup_id, tup_expr) : (export_binds ++ rest))
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection[addAutoScc]{Adding automatic sccs}
+%* *
+%************************************************************************
+
+\begin{code}
+addAutoScc :: Bool -- 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))
+ = getModuleAndGroupDs `thenDs` \ (mod,grp) ->
+ returnDs (bndr, Note (SCC (mkAutoCC bndr mod grp IsNotCafCC)) core_expr)
+ | otherwise
+ = returnDs pair
+
+worthSCC (Note (SCC _) _) = False
+worthSCC (Con _ _) = False
+worthSCC core_expr = True
\end{code}
If profiling and dealing with a dict binding, wrap the dict in "_scc_ DICT <dict>":
|| 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}
projects / ghc-hetmet.git / blobdiff