2 % (c) The AQUA Project, Glasgow University, 1994-1996
4 \section[CoreUnfold]{Core-syntax unfoldings}
6 Unfoldings (which can travel across module boundaries) are in Core
7 syntax (namely @CoreExpr@s).
9 The type @UnfoldingDetails@ sits ``above'' simply-Core-expressions
10 unfoldings, capturing ``higher-level'' things we know about a binding,
11 usually things that the simplifier found out (e.g., ``it's a
12 literal''). In the corner of a @GenForm@ unfolding, you will
13 find, unsurprisingly, a Core expression.
16 #include "HsVersions.h"
19 UnfoldingDetails(..), UnfoldingGuidance(..), -- types
25 modifyUnfoldingDetails,
26 calcUnfoldingGuidance,
31 import IdLoop -- for paranoia checking
32 import PrelLoop -- for paranoia checking
34 import Bag ( emptyBag, unitBag, unionBags, Bag )
35 import BinderInfo ( oneTextualOcc, oneSafeOcc )
36 import CgCompInfo ( uNFOLDING_CHEAP_OP_COST,
37 uNFOLDING_DEAR_OP_COST,
38 uNFOLDING_NOREP_LIT_COST
41 import CoreUtils ( coreExprType )
42 import CostCentre ( ccMentionsId )
43 import Id ( IdSet(..), GenId{-instances-} )
44 import IdInfo ( bottomIsGuaranteed )
45 import Literal ( isNoRepLit, isLitLitLit )
46 import MagicUFs ( mkMagicUnfoldingFun, MagicUnfoldingFun )
48 import PrimOp ( PrimOp(..) )
49 import Type ( getAppDataTyCon )
50 import UniqSet ( emptyUniqSet, singletonUniqSet, mkUniqSet,
53 import Usage ( UVar(..) )
54 import Util ( isIn, panic )
56 manifestlyWHNF = panic "manifestlyWHNF (CoreUnfold)"
57 primOpCanTriggerGC = panic "primOpCanTriggerGC (CoreUnfold)"
58 getTyConFamilySize = panic "getTyConFamilySize (CoreUnfold)"
59 whatsMentionedInId = panic "whatsMentionedInId (CoreUnfold)"
60 getMentionedTyConsAndClassesFromType = panic "getMentionedTyConsAndClassesFromType (CoreUnfold)"
63 %************************************************************************
65 \subsection{@UnfoldingDetails@ and @UnfoldingGuidance@ types}
67 %************************************************************************
69 (And @FormSummary@, too.)
79 [Literal] -- It is a literal, but definitely not one of these
83 [CoreArg] -- Value arguments; NB OutArgs, already cloned
86 [Id] -- It definitely isn't one of these constructors
87 -- This captures the situation in the default branch of
92 -- Then in default-rhs we know that v isn't c1 or c2.
94 -- NB. In the degenerate: case x of {v -> default-rhs}
97 -- which captures the idea that x is eval'd but we don't
98 -- know which constructor.
102 Bool -- True <=> At most one textual occurrence of the
103 -- binder in its scope, *or*
104 -- if we are happy to duplicate this
106 FormSummary -- Tells whether the template is a WHNF or bottom
107 TemplateOutExpr -- The template
108 UnfoldingGuidance -- Tells about the *size* of the template.
111 Unique -- of the Id whose magic unfolding this is
114 type TemplateOutExpr = GenCoreExpr (Id, BinderInfo) Id TyVar UVar
115 -- An OutExpr with occurrence info attached. This is used as
116 -- a template in GeneralForms.
118 mkMagicUnfolding :: Unique -> UnfoldingDetails
119 mkMagicUnfolding tag = MagicForm tag (mkMagicUnfoldingFun tag)
122 = WhnfForm -- Expression is WHNF
123 | BottomForm -- Expression is guaranteed to be bottom. We're more gung
124 -- ho about inlining such things, because it can't waste work
125 | OtherForm -- Anything else
127 instance Outputable FormSummary where
128 ppr sty WhnfForm = ppStr "WHNF"
129 ppr sty BottomForm = ppStr "Bot"
130 ppr sty OtherForm = ppStr "Other"
132 --???mkFormSummary :: StrictnessInfo -> GenCoreExpr bndr Id -> FormSummary
133 mkFormSummary si expr
134 | manifestlyWHNF expr = WhnfForm
135 | bottomIsGuaranteed si = BottomForm
137 -- Chances are that the Id will be decorated with strictness info
138 -- telling that the RHS is definitely bottom. This *might* not be the
139 -- case, if it's been a while since strictness analysis, but leaving out
140 -- the test for manifestlyBottom makes things a little more efficient.
141 -- We can always put it back...
142 -- | manifestlyBottom expr = BottomForm
144 | otherwise = OtherForm
148 data UnfoldingGuidance
149 = UnfoldNever -- Don't do it!
151 | UnfoldAlways -- There is no "original" definition,
152 -- so you'd better unfold. Or: something
153 -- so cheap to unfold (e.g., 1#) that
154 -- you should do it absolutely always.
156 | EssentialUnfolding -- Like UnfoldAlways, but you *must* do
157 -- it absolutely always.
158 -- This is what we use for data constructors
159 -- and PrimOps, because we don't feel like
160 -- generating curried versions "just in case".
162 | UnfoldIfGoodArgs Int -- if "m" type args and "n" value args; and
163 Int -- those val args are manifestly data constructors
164 [Bool] -- the val-arg positions marked True
165 -- (i.e., a simplification will definitely
167 Int -- The "size" of the unfolding; to be elaborated
170 | BadUnfolding -- This is used by TcPragmas if the *lazy*
171 -- lintUnfolding test fails
172 -- It will never escape from the IdInfo as
173 -- it is caught by getInfo_UF and converted
174 -- to NoUnfoldingDetails
178 instance Outputable UnfoldingGuidance where
179 ppr sty UnfoldNever = ppStr "_N_"
180 ppr sty UnfoldAlways = ppStr "_ALWAYS_"
181 ppr sty EssentialUnfolding = ppStr "_ESSENTIAL_" -- shouldn't appear in an iface
182 ppr sty (UnfoldIfGoodArgs t v cs size)
183 = ppCat [ppStr "_IF_ARGS_", ppInt t, ppInt v,
184 if null cs -- always print *something*
186 else ppBesides (map pp_c cs),
189 pp_c False = ppChar 'X'
190 pp_c True = ppChar 'C'
194 %************************************************************************
196 \subsection{@mkGenForm@ and @modifyUnfoldingDetails@}
198 %************************************************************************
201 mkGenForm :: Bool -- Ok to Dup code down different case branches,
202 -- because of either a flag saying so,
203 -- or alternatively the object is *SMALL*
206 -> TemplateOutExpr -- Template
207 -> UnfoldingGuidance -- Tells about the *size* of the template.
210 mkGenForm safe_to_dup occ_info WhnfForm template guidance
211 = GenForm (oneTextualOcc safe_to_dup occ_info) WhnfForm template guidance
213 mkGenForm safe_to_dup occ_info form_summary template guidance
214 | oneSafeOcc safe_to_dup occ_info -- Non-WHNF with only safe occurrences
215 = GenForm True form_summary template guidance
217 | otherwise -- Not a WHNF, many occurrences
222 modifyUnfoldingDetails
224 -> BinderInfo -- New occurrence info for the thing
228 modifyUnfoldingDetails ok_to_dup occ_info
229 (GenForm only_one form_summary template guidance)
230 | only_one = mkGenForm ok_to_dup occ_info form_summary template guidance
232 modifyUnfoldingDetails ok_to_dup occ_info other = other
236 %************************************************************************
238 \subsection[calcUnfoldingGuidance]{Calculate ``unfolding guidance'' for an expression}
240 %************************************************************************
243 calcUnfoldingGuidance
244 :: Bool -- True <=> OK if _scc_s appear in expr
245 -> Int -- bomb out if size gets bigger than this
246 -> CoreExpr -- expression to look at
249 calcUnfoldingGuidance scc_s_OK bOMB_OUT_SIZE expr
251 (use_binders, ty_binders, val_binders, body) = digForLambdas expr
253 case (sizeExpr scc_s_OK bOMB_OUT_SIZE val_binders body) of
255 Nothing -> UnfoldNever
257 Just (size, cased_args)
259 uf = UnfoldIfGoodArgs
262 [ b `is_elem` cased_args | b <- val_binders ]
265 -- pprTrace "calcUnfold:" (ppAbove (ppr PprDebug uf) (ppr PprDebug expr))
268 is_elem = isIn "calcUnfoldingGuidance"
272 sizeExpr :: Bool -- True <=> _scc_s OK
273 -> Int -- Bomb out if it gets bigger than this
274 -> [Id] -- Arguments; we're interested in which of these
277 -> Maybe (Int, -- Size
278 [Id] -- Subset of args which are cased
281 sizeExpr scc_s_OK bOMB_OUT_SIZE args expr
284 size_up (Var v) = sizeOne
285 size_up (App fun arg) = size_up fun `addSize` size_up_arg arg
286 size_up (Lit lit) = if isNoRepLit lit
287 then sizeN uNFOLDING_NOREP_LIT_COST
290 size_up (SCC _ (Con _ _)) = Nothing -- **** HACK *****
291 size_up (SCC lbl body)
292 = if scc_s_OK then size_up body else Nothing
294 size_up (Con con args) = -- 1 + # of val args
295 sizeN (1 + length [ va | va <- args, isValArg va ])
296 size_up (Prim op args) = sizeN op_cost -- NB: no charge for PrimOp args
298 op_cost = if primOpCanTriggerGC op
299 then uNFOLDING_DEAR_OP_COST
300 -- these *tend* to be more expensive;
301 -- number chosen to avoid unfolding (HACK)
302 else uNFOLDING_CHEAP_OP_COST
304 size_up expr@(Lam _ _)
306 (uvars, tyvars, args, body) = digForLambdas expr
308 size_up body `addSizeN` length args
310 size_up (Let (NonRec binder rhs) body)
317 size_up (Let (Rec pairs) body)
318 = foldr addSize sizeZero [size_up rhs | (_,rhs) <- pairs]
324 size_up (Case scrut alts)
325 = size_up_scrut scrut
327 size_up_alts (coreExprType scrut) alts
328 -- We charge for the "case" itself in "size_up_alts"
331 size_up_arg arg = if isValArg arg then sizeOne else sizeZero{-it's free-}
334 size_up_alts scrut_ty (AlgAlts alts deflt)
335 = foldr (addSize . size_alg_alt) (size_up_deflt deflt) alts
337 (case (getTyConFamilySize tycon) of { Just n -> n })
338 -- NB: we charge N for an alg. "case", where N is
339 -- the number of constructors in the thing being eval'd.
340 -- (You'll eventually get a "discount" of N if you
341 -- think the "case" is likely to go away.)
343 size_alg_alt (con,args,rhs) = size_up rhs
344 -- Don't charge for args, so that wrappers look cheap
346 (tycon, _, _) = getAppDataTyCon scrut_ty
348 size_up_alts _ (PrimAlts alts deflt)
349 = foldr (addSize . size_prim_alt) (size_up_deflt deflt) alts
350 -- *no charge* for a primitive "case"!
352 size_prim_alt (lit,rhs) = size_up rhs
355 size_up_deflt NoDefault = sizeZero
356 size_up_deflt (BindDefault binder rhs) = size_up rhs
359 -- Scrutinees. There are two things going on here.
360 -- First, we want to record if we're case'ing an argument
361 -- Second, we want to charge nothing for the srutinee if it's just
362 -- a variable. That way wrapper-like things look cheap.
363 size_up_scrut (Var v) | v `is_elem` args = Just (0, [v])
364 | otherwise = Just (0, [])
365 size_up_scrut other = size_up other
367 is_elem :: Id -> [Id] -> Bool
368 is_elem = isIn "size_up_scrut"
371 sizeZero = Just (0, [])
372 sizeOne = Just (1, [])
373 sizeN n = Just (n, [])
374 sizeVar v = Just (0, [v])
376 addSizeN Nothing _ = Nothing
377 addSizeN (Just (n, xs)) m
378 | tot < bOMB_OUT_SIZE = Just (tot, xs)
379 | otherwise = Nothing
383 addSize Nothing _ = Nothing
384 addSize _ Nothing = Nothing
385 addSize (Just (n, xs)) (Just (m, ys))
386 | tot < bOMB_OUT_SIZE = Just (tot, xys)
387 | otherwise = Nothing
393 %************************************************************************
395 \subsection[unfoldings-for-ifaces]{Processing unfoldings for interfaces}
397 %************************************************************************
399 Of course, the main thing we do to unfoldings-for-interfaces is {\em
400 print} them. But, while we're at it, we collect info about
401 ``mentioned'' Ids, etc., etc.---we're going to need this stuff anyway.
403 %************************************************************************
405 \subsubsection{Monad stuff for the unfolding-generation game}
407 %************************************************************************
410 type UnfoldM bndr thing
411 = IdSet -- in-scope Ids (passed downwards only)
412 -> (bndr -> Id) -- to extract an Id from a binder (down only)
414 -> (Bag Id, -- mentioned global vars (ditto)
415 Bag TyCon, -- ditto, tycons
416 Bag Class, -- ditto, classes
417 Bool) -- True <=> mentions something litlit-ish
419 -> (thing, (Bag Id, Bag TyCon, Bag Class, Bool)) -- accumulated...
422 A little stuff for in-scopery:
424 no_in_scopes :: IdSet
425 add1 :: IdSet -> Id -> IdSet
426 add_some :: IdSet -> [Id] -> IdSet
428 no_in_scopes = emptyUniqSet
429 in_scopes `add1` x = in_scopes `unionUniqSets` singletonUniqSet x
430 in_scopes `add_some` xs = in_scopes `unionUniqSets` mkUniqSet xs
433 The can-see-inside-monad functions are the usual sorts of things.
436 thenUf :: UnfoldM bndr a -> (a -> UnfoldM bndr b) -> UnfoldM bndr b
437 thenUf m k in_scopes get_id mentioneds
438 = case m in_scopes get_id mentioneds of { (v, mentioneds1) ->
439 k v in_scopes get_id mentioneds1 }
441 thenUf_ :: UnfoldM bndr a -> UnfoldM bndr b -> UnfoldM bndr b
442 thenUf_ m k in_scopes get_id mentioneds
443 = case m in_scopes get_id mentioneds of { (_, mentioneds1) ->
444 k in_scopes get_id mentioneds1 }
446 mapUf :: (a -> UnfoldM bndr b) -> [a] -> UnfoldM bndr [b]
447 mapUf f [] = returnUf []
449 = f x `thenUf` \ r ->
450 mapUf f xs `thenUf` \ rs ->
453 returnUf :: a -> UnfoldM bndr a
454 returnUf v in_scopes get_id mentioneds = (v, mentioneds)
456 addInScopesUf :: [Id] -> UnfoldM bndr a -> UnfoldM bndr a
457 addInScopesUf more_in_scopes m in_scopes get_id mentioneds
458 = m (in_scopes `add_some` more_in_scopes) get_id mentioneds
460 getInScopesUf :: UnfoldM bndr IdSet
461 getInScopesUf in_scopes get_id mentioneds = (in_scopes, mentioneds)
463 extractIdsUf :: [bndr] -> UnfoldM bndr [Id]
464 extractIdsUf binders in_scopes get_id mentioneds
465 = (map get_id binders, mentioneds)
467 consider_Id :: Id -> UnfoldM bndr ()
468 consider_Id var in_scopes get_id (ids, tcs, clss, has_litlit)
470 (ids2, tcs2, clss2) = whatsMentionedInId in_scopes var
472 ((), (ids `unionBags` ids2,
473 tcs `unionBags` tcs2,
474 clss `unionBags`clss2,
479 addToMentionedIdsUf :: Id -> UnfoldM bndr ()
480 addToMentionedTyConsUf :: Bag TyCon -> UnfoldM bndr ()
481 addToMentionedClassesUf :: Bag Class -> UnfoldM bndr ()
482 litlit_oops :: UnfoldM bndr ()
484 addToMentionedIdsUf add_me in_scopes get_id (ids, tcs, clss, has_litlit)
485 = ((), (ids `unionBags` unitBag add_me, tcs, clss, has_litlit))
487 addToMentionedTyConsUf add_mes in_scopes get_id (ids, tcs, clss, has_litlit)
488 = ((), (ids, tcs `unionBags` add_mes, clss, has_litlit))
490 addToMentionedClassesUf add_mes in_scopes get_id (ids, tcs, clss, has_litlit)
491 = ((), (ids, tcs, clss `unionBags` add_mes, has_litlit))
493 litlit_oops in_scopes get_id (ids, tcs, clss, _)
494 = ((), (ids, tcs, clss, True))
498 %************************************************************************
500 \subsubsection{Gathering up info for an interface-unfolding}
502 %************************************************************************
507 :: (bndr -> Id) -- so we can get Ids out of binders
508 -> GenCoreExpr bndr Id -- input expression
509 -> (Bag Id, Bag TyCon, Bag Class,
510 -- what we found mentioned in the expr
511 Bool -- True <=> mentions a ``litlit''-ish thing
512 -- (the guy on the other side of an interface
513 -- may not be able to handle it)
517 mentionedInUnfolding get_id expr
518 = case (ment_expr expr no_in_scopes get_id (emptyBag, emptyBag, emptyBag, False)) of
519 (_, (ids_bag, tcs_bag, clss_bag, has_litlit)) ->
520 (ids_bag, tcs_bag, clss_bag, has_litlit)
524 --ment_expr :: GenCoreExpr bndr Id -> UnfoldM bndr ()
526 ment_expr (Var v) = consider_Id v
527 ment_expr (Lit l) = consider_lit l
529 ment_expr expr@(Lam _ _)
531 (uvars, tyvars, args, body) = digForLambdas expr
533 extractIdsUf args `thenUf` \ bs_ids ->
534 addInScopesUf bs_ids (
535 -- this considering is just to extract any mentioned types/classes
536 mapUf consider_Id bs_ids `thenUf_`
540 ment_expr (App fun arg)
541 = ment_expr fun `thenUf_`
545 = consider_Id c `thenUf_`
546 mapUf ment_arg as `thenUf_`
549 ment_expr (Prim op as)
550 = ment_op op `thenUf_`
551 mapUf ment_arg as `thenUf_`
554 ment_op (CCallOp str is_asm may_gc arg_tys res_ty)
555 = mapUf ment_ty arg_tys `thenUf_`
557 ment_op other_op = returnUf ()
559 ment_expr (Case scrutinee alts)
560 = ment_expr scrutinee `thenUf_`
563 ment_expr (Let (NonRec bind rhs) body)
564 = ment_expr rhs `thenUf_`
565 extractIdsUf [bind] `thenUf` \ bi@[bind_id] ->
567 ment_expr body `thenUf_`
568 consider_Id bind_id )
570 ment_expr (Let (Rec pairs) body)
572 binders = map fst pairs
575 extractIdsUf binders `thenUf` \ binder_ids ->
576 addInScopesUf binder_ids (
577 mapUf ment_expr rhss `thenUf_`
578 mapUf consider_Id binder_ids `thenUf_`
581 ment_expr (SCC cc expr)
582 = (case (ccMentionsId cc) of
583 Just id -> consider_Id id
584 Nothing -> returnUf ()
586 `thenUf_` ment_expr expr
591 (tycons, clss) = getMentionedTyConsAndClassesFromType ty
593 addToMentionedTyConsUf tycons `thenUf_`
594 addToMentionedClassesUf clss
598 ment_alts alg_alts@(AlgAlts alts deflt)
599 = mapUf ment_alt alts `thenUf_`
602 ment_alt alt@(con, params, rhs)
603 = consider_Id con `thenUf_`
604 extractIdsUf params `thenUf` \ param_ids ->
605 addInScopesUf param_ids (
606 -- "consider" them so we can chk out their types...
607 mapUf consider_Id param_ids `thenUf_`
610 ment_alts (PrimAlts alts deflt)
611 = mapUf ment_alt alts `thenUf_`
614 ment_alt alt@(lit, rhs) = ment_expr rhs
620 ment_deflt d@(BindDefault b rhs)
621 = extractIdsUf [b] `thenUf` \ bi@[b_id] ->
623 consider_Id b_id `thenUf_`
627 ment_arg (VarArg v) = consider_Id v
628 ment_arg (LitArg l) = consider_lit l
629 ment_arg (TyArg ty) = ment_ty ty
630 ment_arg (UsageArg _) = returnUf ()
634 | isLitLitLit lit = litlit_oops `thenUf_` returnUf ()
635 | otherwise = returnUf ()
638 %************************************************************************
640 \subsubsection{Printing unfoldings in interfaces}
642 %************************************************************************
644 Printing Core-expression unfoldings is sufficiently delicate that we
645 give it its own function.
652 pprCoreUnfolding expr
654 (_, renamed) = instCoreExpr uniqSupply_u expr
655 -- We rename every unfolding with a "steady" unique supply,
656 -- so that the names won't constantly change.
657 -- One place we *MUST NOT* use a splittable UniqueSupply!
659 ppr_uf_Expr emptyUniqSet renamed
661 ppr_Unfolding = PprUnfolding (panic "CoreUnfold:ppr_Unfolding")
665 ppr_uf_Expr in_scopes (Var v) = pprIdInUnfolding in_scopes v
666 ppr_uf_Expr in_scopes (Lit l) = ppr ppr_Unfolding l
668 ppr_uf_Expr in_scopes (Con c as)
669 = ppBesides [ppPStr SLIT("_!_ "), pprIdInUnfolding no_in_scopes c, ppSP,
670 ppLbrack, ppIntersperse pp'SP{-'-} (map (pprParendUniType ppr_Unfolding) ts), ppRbrack,
671 ppSP, ppLbrack, ppIntersperse pp'SP{-'-} (map (ppr_uf_Atom in_scopes) as), ppRbrack]
672 ppr_uf_Expr in_scopes (Prim op as)
673 = ppBesides [ppPStr SLIT("_#_ "), ppr ppr_Unfolding op, ppSP,
674 ppLbrack, ppIntersperse pp'SP{-'-} (map (pprParendUniType ppr_Unfolding) ts), ppRbrack,
675 ppSP, ppLbrack, ppIntersperse pp'SP{-'-} (map (ppr_uf_Atom in_scopes) as), ppRbrack]
677 ppr_uf_Expr in_scopes (Lam binder body)
678 = ppCat [ppChar '\\', ppr_uf_Binder binder,
679 ppPStr SLIT("->"), ppr_uf_Expr (in_scopes `add1` binder) body]
681 ppr_uf_Expr in_scopes (CoTyLam tyvar expr)
682 = ppCat [ppPStr SLIT("_/\\_"), interppSP ppr_Unfolding (tyvar:tyvars), ppStr "->",
683 ppr_uf_Expr in_scopes body]
685 (tyvars, body) = collect_tyvars expr
687 collect_tyvars (CoTyLam tyv e) = ( tyv:tyvs, e_after )
688 where (tyvs, e_after) = collect_tyvars e
689 collect_tyvars other_e = ( [], other_e )
691 ppr_uf_Expr in_scopes expr@(App fun_expr atom)
693 (fun, args) = collect_args expr []
695 ppCat [ppPStr SLIT("_APP_ "), ppr_uf_Expr in_scopes fun, ppLbrack,
696 ppIntersperse pp'SP{-'-} (map (ppr_uf_Atom in_scopes) args), ppRbrack]
698 collect_args (App fun arg) args = collect_args fun (arg:args)
699 collect_args fun args = (fun, args)
701 ppr_uf_Expr in_scopes (CoTyApp expr ty)
702 = ppCat [ppPStr SLIT("_TYAPP_ "), ppr_uf_Expr in_scopes expr,
703 ppChar '{', pprParendUniType ppr_Unfolding ty, ppChar '}']
705 ppr_uf_Expr in_scopes (Case scrutinee alts)
706 = ppCat [ppPStr SLIT("case"), ppr_uf_Expr in_scopes scrutinee, ppStr "of {",
707 pp_alts alts, ppChar '}']
709 pp_alts (AlgAlts alts deflt)
710 = ppCat [ppPStr SLIT("_ALG_"), ppCat (map pp_alg alts), pp_deflt deflt]
711 pp_alts (PrimAlts alts deflt)
712 = ppCat [ppPStr SLIT("_PRIM_"), ppCat (map pp_prim alts), pp_deflt deflt]
714 pp_alg (con, params, rhs)
715 = ppBesides [pprIdInUnfolding no_in_scopes con, ppSP,
716 ppIntersperse ppSP (map ppr_uf_Binder params),
717 ppPStr SLIT(" -> "), ppr_uf_Expr (in_scopes `add_some` params) rhs, ppSemi]
720 = ppBesides [ppr ppr_Unfolding lit,
721 ppPStr SLIT(" -> "), ppr_uf_Expr in_scopes rhs, ppSemi]
723 pp_deflt NoDefault = ppPStr SLIT("_NO_DEFLT_")
724 pp_deflt (BindDefault binder rhs)
725 = ppBesides [ppr_uf_Binder binder, ppPStr SLIT(" -> "),
726 ppr_uf_Expr (in_scopes `add1` binder) rhs]
728 ppr_uf_Expr in_scopes (Let (NonRec binder rhs) body)
729 = ppBesides [ppStr "let {", ppr_uf_Binder binder, ppPStr SLIT(" = "), ppr_uf_Expr in_scopes rhs,
730 ppStr "} in ", ppr_uf_Expr (in_scopes `add1` binder) body]
732 ppr_uf_Expr in_scopes (Let (Rec pairs) body)
733 = ppBesides [ppStr "_LETREC_ {", ppIntersperse sep (map pp_pair pairs),
734 ppStr "} in ", ppr_uf_Expr new_in_scopes body]
736 sep = ppBeside ppSemi ppSP
737 new_in_scopes = in_scopes `add_some` map fst pairs
739 pp_pair (b, rhs) = ppCat [ppr_uf_Binder b, ppEquals, ppr_uf_Expr new_in_scopes rhs]
741 ppr_uf_Expr in_scopes (SCC cc body)
742 = ASSERT(not (noCostCentreAttached cc))
743 ASSERT(not (currentOrSubsumedCosts cc))
744 ppBesides [ppStr "_scc_ { ", ppStr (showCostCentre ppr_Unfolding False{-not as string-} cc), ppStr " } ", ppr_uf_Expr in_scopes body]
748 ppr_uf_Binder :: Id -> Pretty
750 = ppBesides [ppLparen, pprIdInUnfolding (singletonUniqSet v) v, ppPStr SLIT(" :: "),
751 ppr ppr_Unfolding (idType v), ppRparen]
753 ppr_uf_Atom in_scopes (LitArg l) = ppr ppr_Unfolding l
754 ppr_uf_Atom in_scopes (VarArg v) = pprIdInUnfolding in_scopes v