-- All abstract except to friend: ParseIface.y
CostCentreStack,
+ CollectedCCs,
noCCS, subsumedCCS, currentCCS, overheadCCS, dontCareCCS,
noCostCentre, noCCAttached,
noCCSAttached, isCurrentCCS, isSubsumedCCS, currentOrSubsumedCCS,
+ isDerivedFromCurrentCCS, maybeSingletonCCS,
+ decomposeCCS,
mkUserCC, mkAutoCC, mkAllCafsCC,
- mkSingletonCCS, cafifyCC, dupifyCC,
- isCafCC, isDupdCC, isEmptyCC, isCafCCS,
+ mkSingletonCCS, dupifyCC, pushCCOnCCS,
+ isCafCCS, isCafCC,
isSccCountCostCentre,
sccAbleCostCentre,
ccFromThisModule,
- pprCostCentreDecl, pprCostCentreStackDecl, pprCostCentreCore,
+ pprCostCentreCore,
+ costCentreUserName,
cmpCostCentre -- used for removing dups in a list
) where
import Name ( UserFS, EncodedFS, encodeFS, decode,
getOccName, occNameFS
)
-import Module ( Module, ModuleName, moduleName,
- moduleNameUserString
- )
+import Module ( Module, ModuleName, moduleName )
import Outputable
-import CStrings ( pprStringInCStyle )
import FastTypes
+import FastString
import Util ( thenCmp )
\end{code}
-- accumulate any costs. But we still need
-- the placeholder. This CCS is it.
- | SingletonCCS CostCentre
- -- This is primarily for CAF cost centres, which
- -- are attached to top-level thunks right at the
- -- end of STG processing, before code generation.
- -- Hence, a CAF cost centre never appears as the
- -- argument of an _scc_.
- -- Also, we generate these singleton CCSs statically
- -- as part of code generation.
+ | PushCC CostCentre CostCentreStack
+ -- These are used during code generation as the CCSs
+ -- attached to closures. A PushCC never appears as
+ -- the argument to an _scc_.
+ --
+ -- The tail (2nd argument) is either NoCCS, indicating
+ -- a staticly allocated CCS, or CurrentCCS indicating
+ -- a dynamically created CCS. We only support
+ -- statically allocated *singleton* CCSs at the
+ -- moment, for the purposes of initialising the CCS
+ -- field of a CAF.
deriving (Eq, Ord) -- needed for Ord on CLabel
\end{code}
-- "dupd".
data IsCafCC = CafCC | NotCafCC
+
+-- synonym for triple which describes the cost centre info in the generated
+-- code for a module.
+type CollectedCCs
+ = ( [CostCentre] -- local cost-centres that need to be decl'd
+ , [CostCentre] -- "extern" cost-centres
+ , [CostCentreStack] -- pre-defined "singleton" cost centre stacks
+ )
\end{code}
WILL: Would there be any merit to recording ``I am now using a
isSubsumedCCS SubsumedCCS = True
isSubsumedCCS _ = False
-isCafCCS (SingletonCCS cc) = isCafCC cc
+isCafCCS (PushCC cc NoCCS) = isCafCC cc
isCafCCS _ = False
+isDerivedFromCurrentCCS CurrentCCS = True
+isDerivedFromCurrentCCS (PushCC _ ccs) = isDerivedFromCurrentCCS ccs
+isDerivedFromCurrentCCS _ = False
+
currentOrSubsumedCCS SubsumedCCS = True
currentOrSubsumedCCS CurrentCCS = True
currentOrSubsumedCCS _ = False
+
+maybeSingletonCCS (PushCC cc NoCCS) = Just cc
+maybeSingletonCCS _ = Nothing
\end{code}
Building cost centres
\begin{code}
mkUserCC :: UserFS -> Module -> CostCentre
-
mkUserCC cc_name mod
= NormalCC { cc_name = encodeFS cc_name, cc_mod = moduleName mod,
cc_is_dupd = OriginalCC, cc_is_caf = NotCafCC {-might be changed-}
}
mkAutoCC :: Id -> Module -> IsCafCC -> CostCentre
-
mkAutoCC id mod is_caf
= NormalCC { cc_name = occNameFS (getOccName id), cc_mod = moduleName mod,
cc_is_dupd = OriginalCC, cc_is_caf = is_caf
mkAllCafsCC m = AllCafsCC { cc_mod = moduleName m }
-mkSingletonCCS :: CostCentre -> CostCentreStack
-mkSingletonCCS cc = SingletonCCS cc
-cafifyCC, dupifyCC :: CostCentre -> CostCentre
-cafifyCC cc@(NormalCC {cc_is_caf = is_caf})
- = ASSERT(not_a_caf_already is_caf)
- cc {cc_is_caf = CafCC}
- where
- not_a_caf_already CafCC = False
- not_a_caf_already _ = True
-cafifyCC cc = pprPanic "cafifyCC" (ppr cc)
+mkSingletonCCS :: CostCentre -> CostCentreStack
+mkSingletonCCS cc = pushCCOnCCS cc NoCCS
-dupifyCC cc = cc {cc_is_dupd = DupdCC}
+pushCCOnCCS :: CostCentre -> CostCentreStack -> CostCentreStack
+pushCCOnCCS = PushCC
-isEmptyCC, isCafCC, isDupdCC :: CostCentre -> Bool
+dupifyCC cc = cc {cc_is_dupd = DupdCC}
-isEmptyCC (NoCostCentre) = True
-isEmptyCC _ = False
+isCafCC, isDupdCC :: CostCentre -> Bool
isCafCC (AllCafsCC {}) = True
isCafCC (NormalCC {cc_is_caf = CafCC}) = True
cmp_caf NotCafCC NotCafCC = EQ
cmp_caf CafCC CafCC = EQ
cmp_caf CafCC NotCafCC = GT
+
+decomposeCCS :: CostCentreStack -> ([CostCentre],CostCentreStack)
+decomposeCCS (PushCC cc ccs) = (cc:more, ccs')
+ where (more,ccs') = decomposeCCS ccs
+decomposeCCS ccs = ([],ccs)
\end{code}
-----------------------------------------------------------------------------
Printing Cost Centre Stacks.
-There are two ways to print a CCS:
+The outputable instance for CostCentreStack prints the CCS as a C
+expression.
- - for debugging output (i.e. -ddump-whatever),
- - as a C label
+NOTE: Not all cost centres are suitable for using in a static
+initializer. In particular, the PushCC forms where the tail is CCCS
+may only be used in inline C code because they expand to a
+non-constant C expression.
\begin{code}
instance Outputable CostCentreStack where
- ppr ccs = case ccs of
- NoCCS -> ptext SLIT("NO_CCS")
- CurrentCCS -> ptext SLIT("CCCS")
- OverheadCCS -> ptext SLIT("CCS_OVERHEAD")
- DontCareCCS -> ptext SLIT("CCS_DONT_CARE")
- SubsumedCCS -> ptext SLIT("CCS_SUBSUMED")
- SingletonCCS cc -> ppr cc <> ptext SLIT("_ccs")
-
-pprCostCentreStackDecl :: CostCentreStack -> SDoc
-pprCostCentreStackDecl ccs@(SingletonCCS cc)
- = hcat [ ptext SLIT("CCS_DECLARE"), char '(',
- ppr ccs, comma, -- better be codeStyle
- ppCostCentreLbl cc, comma,
- empty, -- Now always externally visible
- text ");"
- ]
-
-pprCostCentreStackDecl ccs
- = pprPanic "pprCostCentreStackDecl: " (ppr ccs)
+ ppr NoCCS = ptext SLIT("NO_CCS")
+ ppr CurrentCCS = ptext SLIT("CCCS")
+ ppr OverheadCCS = ptext SLIT("CCS_OVERHEAD")
+ ppr DontCareCCS = ptext SLIT("CCS_DONT_CARE")
+ ppr SubsumedCCS = ptext SLIT("CCS_SUBSUMED")
+ ppr (PushCC cc NoCCS) = ppr cc <> ptext SLIT("_ccs")
+ ppr (PushCC cc ccs) = ptext SLIT("PushCostCentre") <>
+ parens (ppr ccs <> comma <>
+ parens(ptext SLIT("void *")) <> ppr cc)
\end{code}
-----------------------------------------------------------------------------
pprCostCentreCore (NormalCC {cc_name = n, cc_mod = m,
cc_is_caf = caf, cc_is_dupd = dup})
= text "__scc" <+> braces (hsep [
- ptext n,
+ ftext n,
ppr m,
pp_dup dup,
pp_caf caf
ppCostCentreLbl (NoCostCentre) = text "NONE_cc"
ppCostCentreLbl (AllCafsCC {cc_mod = m}) = ppr m <> text "_CAFs_cc"
ppCostCentreLbl (NormalCC {cc_name = n, cc_mod = m, cc_is_caf = is_caf})
- = ppr m <> ptext n <>
+ = ppr m <> ftext n <>
text (case is_caf of { CafCC -> "_CAF"; _ -> "" }) <> text "_cc"
-- This is the name to go in the user-displayed string,
costCentreUserName (NoCostCentre) = "NO_CC"
costCentreUserName (AllCafsCC {}) = "CAF"
costCentreUserName cc@(NormalCC {cc_name = name, cc_is_caf = is_caf})
- = case is_caf of { CafCC -> "CAF:"; _ -> "" } ++ decode (_UNPK_ name)
-\end{code}
-
-Cost Centre Declarations
-
-\begin{code}
-#ifdef DEBUG
-pprCostCentreDecl is_local (NoCostCentre)
- = panic "pprCostCentreDecl: no cost centre!"
-#endif
-pprCostCentreDecl is_local cc
- = if is_local then
- hcat [
- ptext SLIT("CC_DECLARE"),char '(',
- cc_ident, comma,
- pprStringInCStyle (costCentreUserName cc), comma,
- pprStringInCStyle (moduleNameUserString mod_name), comma,
- ptext is_subsumed, comma,
- empty, -- Now always externally visible
- text ");"]
- else
- hcat [ ptext SLIT("CC_EXTERN"),char '(', cc_ident, text ");" ]
- where
- cc_ident = ppCostCentreLbl cc
- mod_name = cc_mod cc
- is_subsumed = ccSubsumed cc
-
-ccSubsumed :: CostCentre -> FAST_STRING -- subsumed value
-ccSubsumed cc | isCafCC cc = SLIT("CC_IS_CAF")
- | otherwise = SLIT("CC_IS_BORING")
+ = case is_caf of { CafCC -> "CAF:"; _ -> "" } ++ decode (unpackFS name)
\end{code}
projects / ghc-hetmet.git / blobdiff