2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section[StgSyn]{Shared term graph (STG) syntax for spineless-tagless code generation}
6 This data type represents programs just before code generation
7 (conversion to @AbstractC@): basically, what we have is a stylised
8 form of @CoreSyntax@, the style being one that happens to be ideally
9 suited to spineless tagless code generation.
16 GenStgBinding(..), GenStgExpr(..), GenStgRhs(..),
17 GenStgCaseAlts(..), GenStgCaseDefault(..),
19 UpdateFlag(..), isUpdatable,
22 noBinderInfo, stgSatOcc, stgUnsatOcc, satCallsOnly,
25 -- a set of synonyms for the most common (only :-) parameterisation
27 StgBinding, StgExpr, StgRhs,
28 StgCaseAlts, StgCaseDefault,
34 SRT(..), noSRT, nonEmptySRT,
37 stgBindHasCafRefs, stgArgHasCafRefs, stgRhsArity, getArgPrimRep,
38 isLitLitArg, isDllConApp, isStgTypeArg,
39 stgArgType, stgBinders,
41 pprStgBinding, pprStgBindings, pprStgBindingsWithSRTs, pprStgAlts
48 #include "HsVersions.h"
50 import CostCentre ( CostCentreStack, CostCentre )
51 import VarSet ( IdSet, isEmptyVarSet )
53 import Id ( Id, idName, idPrimRep, idType, idCafInfo )
54 import IdInfo ( mayHaveCafRefs )
55 import Name ( isDllName )
56 import Literal ( Literal, literalType, isLitLitLit, literalPrimRep )
57 import ForeignCall ( ForeignCall )
58 import DataCon ( DataCon, dataConName )
59 import PrimOp ( PrimOp )
63 import TyCon ( TyCon )
64 import UniqSet ( isEmptyUniqSet, uniqSetToList, UniqSet )
65 import Unique ( Unique )
67 import CmdLineOpts ( opt_SccProfilingOn )
70 %************************************************************************
72 \subsection{@GenStgBinding@}
74 %************************************************************************
76 As usual, expressions are interesting; other things are boring. Here
77 are the boring things [except note the @GenStgRhs@], parameterised
78 with respect to binder and occurrence information (just as in
81 There is one SRT for each group of bindings.
84 data GenStgBinding bndr occ
85 = StgNonRec bndr (GenStgRhs bndr occ)
86 | StgRec [(bndr, GenStgRhs bndr occ)]
88 stgBinders :: GenStgBinding bndr occ -> [bndr]
89 stgBinders (StgNonRec b _) = [b]
90 stgBinders (StgRec bs) = map fst bs
93 %************************************************************************
95 \subsection{@GenStgArg@}
97 %************************************************************************
103 | StgTypeArg Type -- For when we want to preserve all type info
107 getArgPrimRep (StgVarArg local) = idPrimRep local
108 getArgPrimRep (StgLitArg lit) = literalPrimRep lit
110 isLitLitArg (StgLitArg lit) = isLitLitLit lit
111 isLitLitArg _ = False
113 isStgTypeArg (StgTypeArg _) = True
114 isStgTypeArg other = False
116 isDllArg :: StgArg -> Bool
117 -- Does this argument refer to something in a different DLL?
118 isDllArg (StgTypeArg v) = False
119 isDllArg (StgVarArg v) = isDllName (idName v)
120 isDllArg (StgLitArg lit) = isLitLitLit lit
122 isDllConApp :: DataCon -> [StgArg] -> Bool
123 -- Does this constructor application refer to
124 -- anything in a different DLL?
125 -- If so, we can't allocate it statically
126 isDllConApp con args = isDllName (dataConName con) || any isDllArg args
128 stgArgType :: StgArg -> Type
129 -- Very half baked becase we have lost the type arguments
130 stgArgType (StgVarArg v) = idType v
131 stgArgType (StgLitArg lit) = literalType lit
132 stgArgType (StgTypeArg lit) = panic "stgArgType called on stgTypeArg"
135 %************************************************************************
137 \subsection{STG expressions}
139 %************************************************************************
141 The @GenStgExpr@ data type is parameterised on binder and occurrence
144 %************************************************************************
146 \subsubsection{@GenStgExpr@ application}
148 %************************************************************************
150 An application is of a function to a list of atoms [not expressions].
151 Operationally, we want to push the arguments on the stack and call the
152 function. (If the arguments were expressions, we would have to build
153 their closures first.)
155 There is no constructor for a lone variable; it would appear as
158 type GenStgLiveVars occ = UniqSet occ
160 data GenStgExpr bndr occ
163 [GenStgArg occ] -- arguments; may be empty
166 %************************************************************************
168 \subsubsection{@StgConApp@ and @StgPrimApp@---saturated applications}
170 %************************************************************************
172 There are a specialised forms of application, for
173 constructors, primitives, and literals.
178 [GenStgArg occ] -- Saturated
180 | StgOpApp StgOp -- Primitive op or foreign call
181 [GenStgArg occ] -- Saturated
182 Type -- Result type; we need to know the result type
183 -- so that we can assign result registers.
186 %************************************************************************
188 \subsubsection{@StgLam@}
190 %************************************************************************
192 StgLam is used *only* during CoreToStg's work. Before CoreToStg has finished
193 it encodes (\x -> e) as (let f = \x -> e in f)
197 Type -- Type of whole lambda (useful when making a binder for it)
199 StgExpr -- Body of lambda
203 %************************************************************************
205 \subsubsection{@GenStgExpr@: case-expressions}
207 %************************************************************************
209 This has the same boxed/unboxed business as Core case expressions.
212 (GenStgExpr bndr occ)
213 -- the thing to examine
215 (GenStgLiveVars occ) -- Live vars of whole case expression,
216 -- plus everything that happens after the case
217 -- i.e., those which mustn't be overwritten
219 (GenStgLiveVars occ) -- Live vars of RHSs (plus what happens afterwards)
220 -- i.e., those which must be saved before eval.
222 -- note that an alt's constructor's
223 -- binder-variables are NOT counted in the
224 -- free vars for the alt's RHS
226 bndr -- binds the result of evaluating the scrutinee
228 SRT -- The SRT for the continuation
230 (GenStgCaseAlts bndr occ)
233 %************************************************************************
235 \subsubsection{@GenStgExpr@: @let(rec)@-expressions}
237 %************************************************************************
239 The various forms of let(rec)-expression encode most of the
240 interesting things we want to do.
244 let-closure x = [free-vars] expr [args]
249 let x = (\free-vars -> \args -> expr) free-vars
251 \tr{args} may be empty (and is for most closures). It isn't under
252 circumstances like this:
258 let-closure x = [z] [y] (y+z)
260 The idea is that we compile code for @(y+z)@ in an environment in which
261 @z@ is bound to an offset from \tr{Node}, and @y@ is bound to an
262 offset from the stack pointer.
264 (A let-closure is an @StgLet@ with a @StgRhsClosure@ RHS.)
268 let-constructor x = Constructor [args]
272 (A let-constructor is an @StgLet@ with a @StgRhsCon@ RHS.)
275 Letrec-expressions are essentially the same deal as
276 let-closure/let-constructor, so we use a common structure and
277 distinguish between them with an @is_recursive@ boolean flag.
281 let-unboxed u = an arbitrary arithmetic expression in unboxed values
284 All the stuff on the RHS must be fully evaluated. No function calls either!
286 (We've backed away from this toward case-expressions with
287 suitably-magical alts ...)
290 ~[Advanced stuff here! Not to start with, but makes pattern matching
291 generate more efficient code.]
294 let-escapes-not fail = expr
297 Here the idea is that @e'@ guarantees not to put @fail@ in a data structure,
298 or pass it to another function. All @e'@ will ever do is tail-call @fail@.
299 Rather than build a closure for @fail@, all we need do is to record the stack
300 level at the moment of the @let-escapes-not@; then entering @fail@ is just
301 a matter of adjusting the stack pointer back down to that point and entering
306 f x y = let z = huge-expression in
312 (A let-escapes-not is an @StgLetNoEscape@.)
315 We may eventually want:
317 let-literal x = Literal
321 (ToDo: is this obsolete?)
324 And so the code for let(rec)-things:
327 (GenStgBinding bndr occ) -- right hand sides (see below)
328 (GenStgExpr bndr occ) -- body
330 | StgLetNoEscape -- remember: ``advanced stuff''
331 (GenStgLiveVars occ) -- Live in the whole let-expression
332 -- Mustn't overwrite these stack slots
333 -- *Doesn't* include binders of the let(rec).
335 (GenStgLiveVars occ) -- Live in the right hand sides (only)
336 -- These are the ones which must be saved on
337 -- the stack if they aren't there already
338 -- *Does* include binders of the let(rec) if recursive.
340 (GenStgBinding bndr occ) -- right hand sides (see below)
341 (GenStgExpr bndr occ) -- body
344 %************************************************************************
346 \subsubsection{@GenStgExpr@: @scc@ expressions}
348 %************************************************************************
350 Finally for @scc@ expressions we introduce a new STG construct.
354 CostCentre -- label of SCC expression
355 (GenStgExpr bndr occ) -- scc expression
359 %************************************************************************
361 \subsection{STG right-hand sides}
363 %************************************************************************
365 Here's the rest of the interesting stuff for @StgLet@s; the first
366 flavour is for closures:
368 data GenStgRhs bndr occ
370 CostCentreStack -- CCS to be attached (default is CurrentCCS)
371 StgBinderInfo -- Info about how this binder is used (see below)
372 [occ] -- non-global free vars; a list, rather than
373 -- a set, because order is important
374 !UpdateFlag -- ReEntrant | Updatable | SingleEntry
375 SRT -- The SRT reference
376 [bndr] -- arguments; if empty, then not a function;
377 -- as above, order is important.
378 (GenStgExpr bndr occ) -- body
380 An example may be in order. Consider:
382 let t = \x -> \y -> ... x ... y ... p ... q in e
384 Pulling out the free vars and stylising somewhat, we get the equivalent:
386 let t = (\[p,q] -> \[x,y] -> ... x ... y ... p ...q) p q
388 Stg-operationally, the @[x,y]@ are on the stack, the @[p,q]@ are
389 offsets from @Node@ into the closure, and the code ptr for the closure
390 will be exactly that in parentheses above.
392 The second flavour of right-hand-side is for constructors (simple but important):
395 CostCentreStack -- CCS to be attached (default is CurrentCCS).
396 -- Top-level (static) ones will end up with
397 -- DontCareCCS, because we don't count static
398 -- data in heap profiles, and we don't set CCCS
399 -- from static closure.
400 DataCon -- constructor
401 [GenStgArg occ] -- args
405 stgRhsArity :: StgRhs -> Int
406 stgRhsArity (StgRhsClosure _ _ _ _ _ bndrs _) = count isId bndrs
407 -- The arity never includes type parameters, so
408 -- when keeping type arguments and binders in the Stg syntax
409 -- (opt_RuntimeTypes) we have to fliter out the type binders.
410 stgRhsArity (StgRhsCon _ _ _) = 0
414 stgBindHasCafRefs :: GenStgBinding bndr Id -> Bool
415 stgBindHasCafRefs (StgNonRec _ rhs) = rhsHasCafRefs rhs
416 stgBindHasCafRefs (StgRec binds) = any rhsHasCafRefs (map snd binds)
418 rhsHasCafRefs (StgRhsClosure _ _ _ upd srt _ _)
419 = isUpdatable upd || nonEmptySRT srt
420 rhsHasCafRefs (StgRhsCon _ _ args)
421 = any stgArgHasCafRefs args
423 stgArgHasCafRefs (StgVarArg id) = mayHaveCafRefs (idCafInfo id)
424 stgArgHasCafRefs _ = False
427 Here's the @StgBinderInfo@ type, and its combining op:
431 | SatCallsOnly -- All occurrences are *saturated* *function* calls
432 -- This means we don't need to build an info table and
433 -- slow entry code for the thing
434 -- Thunks never get this value
436 noBinderInfo = NoStgBinderInfo
437 stgUnsatOcc = NoStgBinderInfo
438 stgSatOcc = SatCallsOnly
440 satCallsOnly :: StgBinderInfo -> Bool
441 satCallsOnly SatCallsOnly = True
442 satCallsOnly NoStgBinderInfo = False
444 combineStgBinderInfo :: StgBinderInfo -> StgBinderInfo -> StgBinderInfo
445 combineStgBinderInfo SatCallsOnly SatCallsOnly = SatCallsOnly
446 combineStgBinderInfo info1 info2 = NoStgBinderInfo
449 pp_binder_info NoStgBinderInfo = empty
450 pp_binder_info SatCallsOnly = ptext SLIT("sat-only")
453 %************************************************************************
455 \subsection[Stg-case-alternatives]{STG case alternatives}
457 %************************************************************************
459 Just like in @CoreSyntax@ (except no type-world stuff).
461 * Algebraic cases are done using
462 StgAlgAlts (Just tc) alts deflt
464 * Polymorphic cases, or case of a function type, are done using
465 StgAlgAlts Nothing [] (StgBindDefault e)
467 * Primitive cases are done using
468 StgPrimAlts tc alts deflt
470 We thought of giving polymorphic cases their own constructor,
471 but we get a bit more code sharing this way
473 The type constructor in StgAlgAlts/StgPrimAlts is guaranteed not
474 to be abstract; that is, we can see its representation. This is
475 important because the code generator uses it to determine return
476 conventions etc. But it's not trivial where there's a moduule loop
477 involved, because some versions of a type constructor might not have
478 all the constructors visible. So mkStgAlgAlts (in CoreToStg) ensures
479 that it gets the TyCon from the constructors or literals (which are
480 guaranteed to have the Real McCoy) rather than from the scrutinee type.
483 data GenStgCaseAlts bndr occ
484 = StgAlgAlts (Maybe TyCon) -- Just tc => scrutinee type is
485 -- an algebraic data type
486 -- Nothing => scrutinee type is a type
487 -- variable or function type
488 [(DataCon, -- alts: data constructor,
489 [bndr], -- constructor's parameters,
490 [Bool], -- "use mask", same length as
491 -- parameters; a True in a
492 -- param's position if it is
494 GenStgExpr bndr occ)] -- ...right-hand side.
495 (GenStgCaseDefault bndr occ)
498 [(Literal, -- alts: unboxed literal,
499 GenStgExpr bndr occ)] -- rhs.
500 (GenStgCaseDefault bndr occ)
502 data GenStgCaseDefault bndr occ
503 = StgNoDefault -- small con family: all
504 -- constructor accounted for
505 | StgBindDefault (GenStgExpr bndr occ)
508 %************************************************************************
510 \subsection[Stg]{The Plain STG parameterisation}
512 %************************************************************************
514 This happens to be the only one we use at the moment.
517 type StgBinding = GenStgBinding Id Id
518 type StgArg = GenStgArg Id
519 type StgLiveVars = GenStgLiveVars Id
520 type StgExpr = GenStgExpr Id Id
521 type StgRhs = GenStgRhs Id Id
522 type StgCaseAlts = GenStgCaseAlts Id Id
523 type StgCaseDefault = GenStgCaseDefault Id Id
526 %************************************************************************
528 \subsubsection[UpdateFlag-datatype]{@UpdateFlag@}
530 %************************************************************************
532 This is also used in @LambdaFormInfo@ in the @ClosureInfo@ module.
534 A @ReEntrant@ closure may be entered multiple times, but should not be
535 updated or blackholed. An @Updatable@ closure should be updated after
536 evaluation (and may be blackholed during evaluation). A @SingleEntry@
537 closure will only be entered once, and so need not be updated but may
538 safely be blackholed.
541 data UpdateFlag = ReEntrant | Updatable | SingleEntry
543 instance Outputable UpdateFlag where
545 = char (case u of { ReEntrant -> 'r'; Updatable -> 'u'; SingleEntry -> 's' })
547 isUpdatable ReEntrant = False
548 isUpdatable SingleEntry = False
549 isUpdatable Updatable = True
552 %************************************************************************
554 \subsubsection{StgOp}
556 %************************************************************************
558 An StgOp allows us to group together PrimOps and ForeignCalls.
559 It's quite useful to move these around together, notably
560 in StgOpApp and COpStmt.
563 data StgOp = StgPrimOp PrimOp
565 | StgFCallOp ForeignCall Unique
566 -- The Unique is occasionally needed by the C pretty-printer
567 -- (which lacks a unique supply), notably when generating a
568 -- typedef for foreign-export-dynamic
572 %************************************************************************
574 \subsubsection[Static Reference Tables]{@SRT@}
576 %************************************************************************
578 There is one SRT per top-level function group. Each local binding and
579 case expression within this binding group has a subrange of the whole
580 SRT, expressed as an offset and length.
582 In CoreToStg we collect the list of CafRefs at each SRT site, which is later
583 converted into the length and offset form by the SRT pass.
588 -- generated by CoreToStg
589 | SRT !Int{-offset-} !Int{-length-} !Bitmap{-bitmap-}
590 -- generated by computeSRTs
595 nonEmptySRT NoSRT = False
596 nonEmptySRT (SRTEntries vs) = not (isEmptyVarSet vs)
599 pprSRT (NoSRT) = ptext SLIT("_no_srt_")
600 pprSRT (SRTEntries ids) = text "SRT:" <> ppr ids
601 pprSRT (SRT off length bitmap) = parens (ppr off <> comma <> text "*bitmap*")
604 %************************************************************************
606 \subsection[Stg-pretty-printing]{Pretty-printing}
608 %************************************************************************
610 Robin Popplestone asked for semi-colon separators on STG binds; here's
611 hoping he likes terminators instead... Ditto for case alternatives.
614 pprGenStgBinding :: (Outputable bndr, Outputable bdee, Ord bdee)
615 => GenStgBinding bndr bdee -> SDoc
617 pprGenStgBinding (StgNonRec bndr rhs)
618 = hang (hsep [ppr bndr, equals])
619 4 ((<>) (ppr rhs) semi)
621 pprGenStgBinding (StgRec pairs)
622 = vcat ((ifPprDebug (ptext SLIT("{- StgRec (begin) -}"))) :
623 (map (ppr_bind) pairs) ++ [(ifPprDebug (ptext SLIT("{- StgRec (end) -}")))])
625 ppr_bind (bndr, expr)
626 = hang (hsep [ppr bndr, equals])
627 4 ((<>) (ppr expr) semi)
629 pprStgBinding :: StgBinding -> SDoc
630 pprStgBinding bind = pprGenStgBinding bind
632 pprStgBindings :: [StgBinding] -> SDoc
633 pprStgBindings binds = vcat (map pprGenStgBinding binds)
635 pprGenStgBindingWithSRT
636 :: (Outputable bndr, Outputable bdee, Ord bdee)
637 => (GenStgBinding bndr bdee,[(Id,[Id])]) -> SDoc
639 pprGenStgBindingWithSRT (bind,srts)
640 = vcat (pprGenStgBinding bind : map pprSRT srts)
641 where pprSRT (id,srt) =
642 ptext SLIT("SRT") <> parens (ppr id) <> ptext SLIT(": ") <> ppr srt
644 pprStgBindingsWithSRTs :: [(StgBinding,[(Id,[Id])])] -> SDoc
645 pprStgBindingsWithSRTs binds = vcat (map pprGenStgBindingWithSRT binds)
649 instance (Outputable bdee) => Outputable (GenStgArg bdee) where
652 instance (Outputable bndr, Outputable bdee, Ord bdee)
653 => Outputable (GenStgBinding bndr bdee) where
654 ppr = pprGenStgBinding
656 instance (Outputable bndr, Outputable bdee, Ord bdee)
657 => Outputable (GenStgExpr bndr bdee) where
660 instance (Outputable bndr, Outputable bdee, Ord bdee)
661 => Outputable (GenStgRhs bndr bdee) where
662 ppr rhs = pprStgRhs rhs
666 pprStgArg :: (Outputable bdee) => GenStgArg bdee -> SDoc
668 pprStgArg (StgVarArg var) = ppr var
669 pprStgArg (StgLitArg con) = ppr con
670 pprStgArg (StgTypeArg ty) = char '@' <+> ppr ty
674 pprStgExpr :: (Outputable bndr, Outputable bdee, Ord bdee)
675 => GenStgExpr bndr bdee -> SDoc
677 pprStgExpr (StgLit lit) = ppr lit
680 pprStgExpr (StgApp func args)
682 4 (sep (map (ppr) args))
686 pprStgExpr (StgConApp con args)
687 = hsep [ ppr con, brackets (interppSP args)]
689 pprStgExpr (StgOpApp op args _)
690 = hsep [ pprStgOp op, brackets (interppSP args)]
692 pprStgExpr (StgLam _ bndrs body)
693 =sep [ char '\\' <+> ppr bndrs <+> ptext SLIT("->"),
698 -- special case: let v = <very specific thing>
704 -- Very special! Suspicious! (SLPJ)
707 pprStgExpr (StgLet srt (StgNonRec bndr (StgRhsClosure cc bi free_vars upd_flag args rhs))
710 (hang (hcat [ptext SLIT("let { "), ppr bndr, ptext SLIT(" = "),
713 ptext SLIT(" ["), ifPprDebug (interppSP free_vars), ptext SLIT("] \\"),
714 ppr upd_flag, ptext SLIT(" ["),
715 interppSP args, char ']'])
716 8 (sep [hsep [ppr rhs, ptext SLIT("} in")]]))
720 -- special case: let ... in let ...
722 pprStgExpr (StgLet bind expr@(StgLet _ _))
724 (sep [hang (ptext SLIT("let {"))
725 2 (hsep [pprGenStgBinding bind, ptext SLIT("} in")])])
729 pprStgExpr (StgLet bind expr)
730 = sep [hang (ptext SLIT("let {")) 2 (pprGenStgBinding bind),
731 hang (ptext SLIT("} in ")) 2 (ppr expr)]
733 pprStgExpr (StgLetNoEscape lvs_whole lvs_rhss bind expr)
734 = sep [hang (ptext SLIT("let-no-escape {"))
735 2 (pprGenStgBinding bind),
736 hang ((<>) (ptext SLIT("} in "))
739 hcat [ptext SLIT("-- lvs: ["), interppSP (uniqSetToList lvs_whole),
740 ptext SLIT("]; rhs lvs: ["), interppSP (uniqSetToList lvs_rhss),
746 pprStgExpr (StgSCC cc expr)
747 = sep [ hsep [ptext SLIT("_scc_"), ppr cc],
752 pprStgExpr (StgCase expr lvs_whole lvs_rhss bndr srt alts)
753 = sep [sep [ptext SLIT("case"),
754 nest 4 (hsep [pprStgExpr expr,
755 ifPprDebug (dcolon <+> pp_ty alts)]),
756 ptext SLIT("of"), ppr bndr, char '{'],
759 hcat [ptext SLIT("-- lvs: ["), interppSP (uniqSetToList lvs_whole),
760 ptext SLIT("]; rhs lvs: ["), interppSP (uniqSetToList lvs_rhss),
763 nest 2 (pprStgAlts alts),
766 pp_ty (StgAlgAlts maybe_tycon _ _) = ppr maybe_tycon
767 pp_ty (StgPrimAlts tycon _ _) = ppr tycon
769 pprStgAlts (StgAlgAlts _ alts deflt)
770 = vcat [ vcat (map (ppr_bxd_alt) alts),
771 pprStgDefault deflt ]
773 ppr_bxd_alt (con, params, use_mask, expr)
774 = hang (hsep [ppr con, interppSP params, ptext SLIT("->")])
775 4 ((<>) (ppr expr) semi)
777 pprStgAlts (StgPrimAlts _ alts deflt)
778 = vcat [ vcat (map (ppr_ubxd_alt) alts),
779 pprStgDefault deflt ]
781 ppr_ubxd_alt (lit, expr)
782 = hang (hsep [ppr lit, ptext SLIT("->")])
783 4 ((<>) (ppr expr) semi)
785 pprStgDefault StgNoDefault = empty
786 pprStgDefault (StgBindDefault expr) = hang (hsep [ptext SLIT("DEFAULT"), ptext SLIT("->")])
789 pprStgOp (StgPrimOp op) = ppr op
790 pprStgOp (StgFCallOp op _) = ppr op
794 pprStgLVs :: Outputable occ => GenStgLiveVars occ -> SDoc
796 = getPprStyle $ \ sty ->
797 if userStyle sty || isEmptyUniqSet lvs then
800 hcat [text "{-lvs:", interpp'SP (uniqSetToList lvs), text "-}"]
804 pprStgRhs :: (Outputable bndr, Outputable bdee, Ord bdee)
805 => GenStgRhs bndr bdee -> SDoc
808 pprStgRhs (StgRhsClosure cc bi [free_var] upd_flag srt [{-no args-}] (StgApp func []))
811 brackets (ifPprDebug (ppr free_var)),
812 ptext SLIT(" \\"), ppr upd_flag, pprMaybeSRT srt, ptext SLIT(" [] "), ppr func ]
815 pprStgRhs (StgRhsClosure cc bi free_vars upd_flag srt args body)
816 = hang (hsep [if opt_SccProfilingOn then ppr cc else empty,
818 ifPprDebug (brackets (interppSP free_vars)),
819 char '\\' <> ppr upd_flag, pprMaybeSRT srt, brackets (interppSP args)])
822 pprStgRhs (StgRhsCon cc con args)
824 space, ppr con, ptext SLIT("! "), brackets (interppSP args)]
826 pprMaybeSRT (NoSRT) = empty
827 pprMaybeSRT srt = ptext SLIT("srt:") <> pprSRT srt