%
-% (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 ( dsMonoBinds ) where
+
#include "HsVersions.h"
-module DsBinds ( dsBinds ) where
-IMP_Ubiq()
-#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ <= 201
-IMPORT_DELOOPER(DsLoop) -- break dsExpr-ish loop
-#else
-import {-# SOURCE #-} DsExpr
-#endif
+import {-# SOURCE #-} DsExpr( 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 ( TypecheckedMonoBinds )
import DsMonad
import DsGRHSs ( dsGuarded )
import DsUtils
import Match ( matchWrapper )
-import BasicTypes ( SYN_IE(Module) )
+import BasicTypes ( 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 )
-import Name ( isExported )
-import PprType ( GenType )
-import Outputable ( PprStyle(..) )
-import Type ( mkTyVarTy, isDictTy, instantiateTy
+ opt_AutoSccsOnExportedToplevs
+ )
+import CostCentre ( mkAutoCC, IsCafCC(..), mkAllDictsCC )
+import Id ( idType, Id )
+import VarEnv
+import Name ( Module, isExported )
+import Type ( mkTyVarTy, isDictTy, substTy
)
-import TyVar ( tyVarSetToList, GenTyVar{-instance Eq-} )
-import TysPrim ( voidTy )
-import Util ( isIn, panic, assertPanic )
+import TysWiredIn ( voidTy )
+import Outputable
\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)
-
-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]
- )
-\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)]
+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 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)
+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 mb_mod_grp 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 [addAutoScc mb_mod_grp (fun, mkValLam args body)]
+ 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 mb_mod_grp is_rec (PatMonoBind pat grhss_and_binds locn)
+dsMonoBinds _ (PatMonoBind pat grhss locn) rest
= putSrcLocDs locn $
- dsGuarded grhss_and_binds `thenDs` \ body_expr ->
- mkSelectorBinds pat body_expr
+ dsGuarded grhss `thenDs` \ body_expr ->
+ mkSelectorBinds pat body_expr `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])
+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 mb_mod_grp 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 Nothing 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 [addAutoScc mb_mod_grp (global, mkLam tyvars dicts $
- mkCoLetsAny core_binds (Var local))]
+ addAutoScc auto_scc (global, mkLams tyvars $ mkLams dicts $
+ mkLets core_binds (Var local)) `thenDs` \ global' ->
+ returnDs (global' : rest)
-dsMonoBinds mb_mod_grp is_rec (AbsBinds all_tyvars dicts exports binds)
- = dsMonoBinds Nothing 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]
-
- tup_expr = mkLam all_tyvars dicts $
- mkCoLetsAny core_binds $
- mkTupleExpr locals
- locals = [local | (_, _, local) <- exports]
- local_tys = map idType locals
+ core_binds = [Rec core_prs]
+
+ 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' ->
- returnDs (addAutoScc mb_mod_grp $
- (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 ->
+ addAutoScc auto_scc
+ (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
+ 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)
+ returnDs ((poly_tup_id, poly_tup_expr) : (export_binds ++ rest))
\end{code}
%************************************************************************
\begin{code}
-addAutoScc :: Maybe (Module, Group) -- Module and group
+addAutoScc :: Bool -- if needs be, decorate toplevs?
-> (Id, CoreExpr)
- -> (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 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