2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
4 \section[CostCentre]{The @CostCentre@ data type}
7 #include "HsVersions.h"
10 CostCentre, CcKind, IsDupdCC{-ToDo:rm-}, IsCafCC(..),
11 noCostCentre, subsumedCosts,
13 noCostCentreAttached, costsAreSubsumed,
14 currentOrSubsumedCosts,
15 preludeCafsCostCentre, preludeDictsCostCentre,
16 overheadCostCentre, dontCareCostCentre,
18 mkUserCC, mkAutoCC, mkDictCC, mkAllCafsCC, mkAllDictsCC,
19 cafifyCC, unCafifyCC, dupifyCC,
20 isCafCC, isDictCC, isDupdCC,
25 uppCostCentre, uppCostCentreDecl, showCostCentre, -- printing
27 cmpCostCentre -- used for removing dups in a list
32 import Id ( externallyVisibleId, GenId, Id(..) )
33 import CStrings ( identToC, stringToC )
34 import Maybes ( Maybe(..) )
35 import Name ( showRdr, getOccName, RdrName )
36 import Pretty ( ppShow, prettyToUn )
37 import PprStyle ( PprStyle(..) )
42 showId = panic "Whoops"
43 pprIdInUnfolding = panic "Whoops"
48 = NoCostCentre -- Having this constructor avoids having
49 -- to use "Maybe CostCentre" all the time.
51 | NormalCC CcKind -- CcKind will include a cost-centre name
52 FAST_STRING -- Name of module defining this CC.
53 FAST_STRING -- "Group" that this CC is in.
57 | CurrentCC -- Pinned on a let(rec)-bound thunk/function/constructor,
58 -- this says that the cost centre to be attached to
59 -- the object, when it is allocated, is whatever is in the
60 -- current-cost-centre register.
61 -- This guy is *never* the cost centre for an SCC construct,
62 -- and is only used for *local* (non-top-level) definitions.
64 | SubsumedCosts -- Cost centre for top-level subsumed functions
65 -- (CAFs get an AllCafsCC).
66 -- Its execution costs get subsumed into the caller.
67 -- This guy is *only* ever pinned on static closures,
68 -- and is *never* the cost centre for an SCC construct.
70 | AllCafsCC FAST_STRING -- Ditto for CAFs.
71 FAST_STRING -- We record module and group names.
72 -- Again, one "big" CAF cc per module, where all
73 -- CAF costs are attributed unless the user asked for
74 -- per-individual-CAF cost attribution.
76 | AllDictsCC FAST_STRING -- Ditto for dictionaries.
77 FAST_STRING -- We record module and group names.
78 -- Again, one "big" DICT cc per module, where all
79 -- DICT costs are attributed unless the user asked for
80 -- per-individual-DICT cost attribution.
83 | OverheadCC -- We charge costs due to the profiling-system
84 -- doing its work to "overhead".
86 -- Objects whose cost-centre is "Overhead"
87 -- have their *allocation* charged to "overhead",
88 -- but have the current CC put into the object
91 -- For example, if we transform "f g" to "let
92 -- g' = g in f g'" (so that something about
93 -- profiling works better...), then we charge
94 -- the *allocation* of g' to OverheadCC, but
95 -- we put the cost-centre of the call to f
96 -- (i.e., current CC) into the g' object. When
97 -- g' is entered, the cost-centre of the call
100 | PreludeCafsCC -- In compiling the prelude, we do sometimes
101 | PreludeDictsCC -- need a CC to blame; i.e., when there's a CAF,
102 -- or other costs that really shouldn't be
103 -- subsumed/blamed-on-the-caller. These costs
104 -- should be *small*. We treat PreludeCafsCC
105 -- as if it were shorthand for
106 -- (AllCafsCC <PreludeSomething> _). Analogously
107 -- for PreludeDictsCC...
108 IsDupdCC -- see below/above
110 | DontCareCC -- We need a cost-centre to stick in static closures
111 -- (for data), but we *don't* expect them to
112 -- accumulate any costs. But we still need
113 -- the placeholder. This CC is it.
116 = UserCC FAST_STRING -- Supplied by user: String is the cc name
117 | AutoCC Id -- CC -auto-magically inserted for that Id
121 = AnOriginalCC -- This says how the CC is *used*. Saying that
122 | ADupdCC -- it is ADupdCC doesn't make it a different
123 -- CC, just that it a sub-expression which has
124 -- been moved ("dupd") into a different scope.
125 -- In the papers, it's called "SCCsub",
126 -- i.e. SCCsub CC == SCC ADupdCC,
127 -- but we are trying to avoid confusion between
128 -- "subd" and "subsumed". So we call the former
136 WILL: Would there be any merit to recording ``I am now using a
137 cost-centre from another module''? I don't know if this would help a
138 user; it might be interesting to us to know how much computation is
139 being moved across module boundaries.
141 SIMON: Maybe later...
144 noCostCentre = NoCostCentre
145 subsumedCosts = SubsumedCosts
146 useCurrentCostCentre = CurrentCC
147 overheadCostCentre = OverheadCC
148 preludeCafsCostCentre = PreludeCafsCC
149 dontCareCostCentre = DontCareCC
150 preludeDictsCostCentre is_dupd
151 = PreludeDictsCC (if is_dupd then ADupdCC else AnOriginalCC)
153 noCostCentreAttached NoCostCentre = True
154 noCostCentreAttached _ = False
156 costsAreSubsumed SubsumedCosts = True
157 costsAreSubsumed _ = False
159 currentOrSubsumedCosts SubsumedCosts = True
160 currentOrSubsumedCosts CurrentCC = True
161 currentOrSubsumedCosts _ = False
163 mkUserCC :: FAST_STRING -> FAST_STRING -> FAST_STRING -> CostCentre
165 mkUserCC cc_name module_name group_name
166 = NormalCC (UserCC cc_name) module_name group_name
167 AnOriginalCC IsNotCafCC{-might be changed-}
169 mkDictCC, mkAutoCC :: Id -> FAST_STRING -> FAST_STRING -> IsCafCC -> CostCentre
171 mkDictCC id module_name group_name is_caf
172 = NormalCC (DictCC id) module_name group_name
175 mkAutoCC id module_name group_name is_caf
176 = NormalCC (AutoCC id) module_name group_name
179 mkAllCafsCC m g = AllCafsCC m g
180 mkAllDictsCC m g is_dupd
181 = AllDictsCC m g (if is_dupd then ADupdCC else AnOriginalCC)
183 cafifyCC, unCafifyCC, dupifyCC :: CostCentre -> CostCentre
185 cafifyCC cc@(AllDictsCC _ _ _) = cc -- ???????? ToDo
186 cafifyCC cc@(PreludeDictsCC _) = cc -- ditto
187 cafifyCC (NormalCC kind m g is_dupd is_caf)
188 = ASSERT(not_a_calf_already is_caf)
189 NormalCC kind m g is_dupd IsCafCC
191 not_a_calf_already IsCafCC = False
192 not_a_calf_already _ = True
193 cafifyCC cc = panic ("cafifyCC"++(showCostCentre PprDebug False cc))
195 -- WDP 95/07: pretty dodgy
196 unCafifyCC (NormalCC kind m g is_dupd IsCafCC) = NormalCC kind m g is_dupd IsNotCafCC
197 unCafifyCC (AllCafsCC _ _) = CurrentCC
198 unCafifyCC PreludeCafsCC = CurrentCC
199 unCafifyCC (AllDictsCC _ _ _) = CurrentCC
200 unCafifyCC (PreludeDictsCC _) = CurrentCC
201 unCafifyCC other_cc = other_cc
203 dupifyCC (AllDictsCC m g _) = AllDictsCC m g ADupdCC
204 dupifyCC (PreludeDictsCC _) = PreludeDictsCC ADupdCC
205 dupifyCC (NormalCC kind m g is_dupd is_caf)
206 = NormalCC kind m g ADupdCC is_caf
207 dupifyCC cc = panic ("dupifyCC"++(showCostCentre PprDebug False cc))
209 isCafCC, isDictCC, isDupdCC :: CostCentre -> Bool
211 isCafCC (AllCafsCC _ _) = True
212 isCafCC PreludeCafsCC = True
213 isCafCC (NormalCC _ _ _ _ IsCafCC) = True
216 isDictCC (AllDictsCC _ _ _) = True
217 isDictCC (PreludeDictsCC _) = True
218 isDictCC (NormalCC (DictCC _) _ _ _ _) = True
221 isDupdCC (AllDictsCC _ _ ADupdCC) = True
222 isDupdCC (PreludeDictsCC ADupdCC) = True
223 isDupdCC (NormalCC _ _ _ ADupdCC _) = True
226 setToAbleCostCentre :: CostCentre -> Bool
227 -- Is this a cost-centre to which CCC might reasonably
228 -- be set? setToAbleCostCentre is allowed to panic on
229 -- "nonsense" cases, too...
232 setToAbleCostCentre NoCostCentre = panic "setToAbleCC:NoCostCentre"
233 setToAbleCostCentre SubsumedCosts = panic "setToAbleCC:SubsumedCosts"
234 setToAbleCostCentre CurrentCC = panic "setToAbleCC:CurrentCC"
235 setToAbleCostCentre DontCareCC = panic "setToAbleCC:DontCareCC"
238 setToAbleCostCentre OverheadCC = False -- see comments in type defn
239 setToAbleCostCentre other = not (isCafCC other || isDictCC other)
241 ccFromThisModule :: CostCentre -> FAST_STRING{-module name-} -> Bool
243 ccFromThisModule (NormalCC _ m _ _ _) mod_name = m == mod_name
244 ccFromThisModule (AllCafsCC m _) mod_name = m == mod_name
245 ccFromThisModule (AllDictsCC m _ _) mod_name = m == mod_name
246 ccFromThisModule PreludeCafsCC _ = False
247 ccFromThisModule (PreludeDictsCC _) _ = False
248 ccFromThisModule OverheadCC _ = False
249 ccFromThisModule DontCareCC _ = False
250 -- shouldn't ask about any others!
254 ccMentionsId :: CostCentre -> Maybe Id
256 ccMentionsId (NormalCC (AutoCC id) _ _ _ _) = Just id
257 ccMentionsId (NormalCC (DictCC id) _ _ _ _) = Just id
258 ccMentionsId other = Nothing
262 cmpCostCentre :: CostCentre -> CostCentre -> TAG_
264 cmpCostCentre (AllCafsCC m1 _) (AllCafsCC m2 _) = _CMP_STRING_ m1 m2
265 cmpCostCentre (AllDictsCC m1 _ _) (AllDictsCC m2 _ _) = _CMP_STRING_ m1 m2
266 cmpCostCentre PreludeCafsCC PreludeCafsCC = EQ_
267 cmpCostCentre (PreludeDictsCC _) (PreludeDictsCC _) = EQ_
268 cmpCostCentre OverheadCC OverheadCC = EQ_
269 cmpCostCentre DontCareCC DontCareCC = EQ_
271 cmpCostCentre (NormalCC k1 m1 _ _ c1) (NormalCC k2 m2 _ _ c2)
272 -- first key is module name, then we use "kinds" (which include
274 = case (_CMP_STRING_ m1 m2) of
276 EQ_ -> cmp_kind k1 k2
279 cmpCostCentre other_1 other_2
281 tag1 = tag_CC other_1
282 tag2 = tag_CC other_2
284 if tag1 _LT_ tag2 then LT_ else GT_
286 tag_CC (NormalCC _ _ _ _ _) = (ILIT(1) :: FAST_INT)
287 tag_CC (AllCafsCC _ _) = ILIT(2)
288 tag_CC (AllDictsCC _ _ _) = ILIT(3)
289 tag_CC PreludeCafsCC = ILIT(4)
290 tag_CC (PreludeDictsCC _) = ILIT(5)
291 tag_CC OverheadCC = ILIT(6)
292 tag_CC DontCareCC = ILIT(7)
294 -- some BUG avoidance here...
295 tag_CC NoCostCentre = panic# "tag_CC:NoCostCentre"
296 tag_CC SubsumedCosts = panic# "tag_CC:SubsumedCosts"
297 tag_CC CurrentCC = panic# "tag_CC:SubsumedCosts"
300 cmp_kind (UserCC n1) (UserCC n2) = _CMP_STRING_ n1 n2
301 cmp_kind (AutoCC i1) (AutoCC i2) = cmp i1 i2
302 cmp_kind (DictCC i1) (DictCC i2) = cmp i1 i2
303 cmp_kind other_1 other_2
305 tag1 = tag_CcKind other_1
306 tag2 = tag_CcKind other_2
308 if tag1 _LT_ tag2 then LT_ else GT_
310 tag_CcKind (UserCC _) = (ILIT(1) :: FAST_INT)
311 tag_CcKind (AutoCC _) = ILIT(2)
312 tag_CcKind (DictCC _) = ILIT(3)
316 showCostCentre :: PprStyle -> Bool -> CostCentre -> String
317 uppCostCentre :: PprStyle -> Bool -> CostCentre -> Unpretty
318 uppCostCentreDecl :: PprStyle -> Bool -> CostCentre -> Unpretty
320 showCostCentre PprUnfolding print_as_string cc
321 = ASSERT(not print_as_string) -- we never "print as string w/ Unfolding"
322 ASSERT(not (noCostCentreAttached cc))
323 ASSERT(not (currentOrSubsumedCosts cc))
324 uppShow 80 (upp_cc_uf cc)
326 showCostCentre sty print_as_string cc
327 = uppShow 80 (uppCostCentre sty print_as_string cc)
329 uppCostCentre sty print_as_string NoCostCentre
330 | friendly_style sty = uppNil
331 | print_as_string = uppStr "\"NO_CC\""
332 | otherwise = uppPStr SLIT("NO_CC")
334 uppCostCentre sty print_as_string SubsumedCosts
335 | print_as_string = uppStr "\"SUBSUMED\""
336 | otherwise = uppPStr SLIT("CC_SUBSUMED")
338 uppCostCentre sty print_as_string CurrentCC
339 | print_as_string = uppStr "\"CURRENT_CC\""
340 | otherwise = uppPStr SLIT("CCC")
342 uppCostCentre sty print_as_string OverheadCC
343 | print_as_string = uppStr "\"OVERHEAD\""
344 | otherwise = uppPStr SLIT("CC_OVERHEAD")
346 uppCostCentre sty print_as_string cc
348 prefix_CC = uppPStr SLIT("CC_")
350 basic_thing -- (basic_thing, suffix_CAF)
354 = if friendly_sty then basic_thing else stringToC basic_thing
356 if print_as_string then
357 uppBesides [uppChar '"', uppStr basic_thing_string, uppChar '"']
359 else if friendly_sty then
362 uppBesides [prefix_CC,
363 prettyToUn (identToC (_PK_ basic_thing))]
365 friendly_sty = friendly_style sty
367 add_module_name_maybe m str
368 = if print_as_string then str else (str ++ ('.' : m))
371 do_cc OverheadCC = "OVERHEAD"
372 do_cc DontCareCC = "DONT_CARE"
373 do_cc (AllCafsCC m _) = if print_as_string
375 else "CAFs." ++ _UNPK_ m
376 do_cc (AllDictsCC m _ d) = do_dupd d (
379 else "DICTs." ++ _UNPK_ m)
380 do_cc PreludeCafsCC = if print_as_string
383 do_cc (PreludeDictsCC d) = do_dupd d (
388 do_cc (NormalCC kind mod_name grp_name is_dupd is_caf)
390 basic_kind = do_kind kind
391 is_a_calf = do_calved is_caf
394 do_dupd is_dupd (basic_kind ++ ('/': _UNPK_ mod_name) ++ ('/': _UNPK_ grp_name) ++ is_a_calf)
398 do_kind (UserCC name) = _UNPK_ name
399 do_kind (AutoCC id) = do_id id ++ (if friendly_sty then "/AUTO" else "")
400 do_kind (DictCC id) = do_id id ++ (if friendly_sty then "/DICT" else "")
402 do_id :: Id -> String
405 then showRdr sty (getOccName id) -- use occ name
406 else showId sty id -- we really do
408 do_calved IsCafCC = "/CAF"
412 do_dupd ADupdCC str = if friendly_sty then str ++ "/DUPD" else str
415 friendly_style sty -- i.e., probably for human consumption
423 Printing unfoldings is sufficiently weird that we do it separately.
424 This should only apply to CostCentres that can be ``set to'' (cf
425 @setToAbleCostCentre@). That excludes CAFs and
426 `overhead'---which are added at the very end---but includes dictionaries.
427 Dict \tr{_scc_}s may cross module boundaries to show ``scope'' info;
428 even if we won't ultimately do a \tr{SET_CCC} from it.
430 upp_cc_uf (PreludeDictsCC d)
431 = uppCat [uppPStr SLIT("_PRELUDE_DICTS_CC_"), upp_dupd d]
432 upp_cc_uf (AllDictsCC m g d)
433 = uppCat [uppPStr SLIT("_ALL_DICTS_CC_"), uppStr (show (_UNPK_ m)), uppStr (show (_UNPK_ g)), upp_dupd d]
435 upp_cc_uf cc@(NormalCC cc_kind m g is_dupd is_caf)
436 = ASSERT(isDictCC cc || setToAbleCostCentre cc)
437 uppCat [pp_kind cc_kind, uppStr (show (_UNPK_ m)), uppStr (show (_UNPK_ g)),
438 upp_dupd is_dupd, pp_caf is_caf]
440 pp_kind (UserCC name) = uppBeside (uppPStr SLIT("_USER_CC_ ")) (uppStr (show (_UNPK_ name)))
441 pp_kind (AutoCC id) = uppBeside (uppPStr SLIT("_AUTO_CC_ ")) (show_id id)
442 pp_kind (DictCC id) = uppBeside (uppPStr SLIT("_DICT_CC_ ")) (show_id id)
444 show_id id = prettyToUn (pprIdInUnfolding no_in_scopes id)
446 no_in_scopes = emptyUniqSet
448 pp_caf IsCafCC = uppPStr SLIT("_CAF_CC_")
449 pp_caf IsNotCafCC = uppPStr SLIT("_N_")
452 upp_cc_uf other = panic ("upp_cc_uf:"++(showCostCentre PprDebug True other))
455 upp_dupd AnOriginalCC = uppPStr SLIT("_N_")
456 upp_dupd ADupdCC = uppPStr SLIT("_DUPD_CC_")
460 uppCostCentreDecl sty is_local cc
462 | noCostCentreAttached cc || currentOrSubsumedCosts cc
463 = panic "uppCostCentreDecl: no cost centre!"
468 uppStr "CC_DECLARE(",
470 uppCostCentre sty True {-as String!-} cc, uppComma,
471 pp_str mod_name, uppComma,
472 pp_str grp_name, uppComma,
473 uppStr is_subsumed, uppComma,
474 if externally_visible then uppNil else uppPStr SLIT("static"),
477 uppBesides [ uppStr "CC_EXTERN(", upp_ident, uppStr ");" ]
479 upp_ident = uppCostCentre sty False{-as identifier!-} cc
481 pp_str s = uppBeside (uppPStr (_CONS_ '"' s)) (uppChar '"')
482 pp_char c = uppBeside (uppPStr (_CONS_ '\'' c)) (uppChar '\'')
484 (mod_name, grp_name, is_subsumed, externally_visible)
486 AllCafsCC m g -> (m, g, cc_IS_CAF, True)
488 AllDictsCC m g _ -> (m, g, cc_IS_DICT, True)
490 NormalCC (DictCC i) m g is_dupd is_caf
491 -> (m, g, cc_IS_DICT, externallyVisibleId i)
493 NormalCC x m g is_dupd is_caf
494 -> (m, g, do_caf is_caf,
495 case x of { UserCC _ -> True; AutoCC i -> externallyVisibleId i})
497 cc_IS_CAF = "CC_IS_CAF"
498 cc_IS_DICT = "CC_IS_DICT"
499 cc_IS_SUBSUMED = "CC_IS_SUBSUMED"
500 cc_IS_BORING = "CC_IS_BORING"
502 do_caf IsCafCC = cc_IS_CAF
503 do_caf IsNotCafCC = cc_IS_BORING