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{-
(c) The GRASP/AQUA Project, Glasgow University, 1992-1998
\section[StgStats]{Gathers statistical information about programs}
The program gather statistics about
\begin{enumerate}
\item number of boxed cases
\item number of unboxed cases
\item number of let-no-escapes
\item number of non-updatable lets
\item number of updatable lets
\item number of applications
\item number of primitive applications
\item number of closures (does not include lets bound to constructors)
\item number of free variables in closures
%\item number of top-level functions
%\item number of top-level CAFs
\item number of constructors
\end{enumerate}
-}
module GHC.Stg.Stats ( showStgStats ) where
import GHC.Prelude
import GHC.Stg.Syntax
import GHC.Types.Id (Id)
import Data.Map (Map)
import qualified Data.Map as Map
data CounterType
= Literals
| Applications
| ConstructorApps
| PrimitiveApps
| LetNoEscapes
| StgCases
| FreeVariables
| ConstructorBinds Bool{-True<=>top-level-}
| ReEntrantBinds Bool{-ditto-}
| SingleEntryBinds Bool{-ditto-}
| UpdatableBinds Bool{-ditto-}
deriving (Eq, Ord)
type Count = Int
type StatEnv = Map CounterType Count
emptySE :: StatEnv
emptySE = Map.empty
combineSE :: StatEnv -> StatEnv -> StatEnv
combineSE = Map.unionWith (+)
combineSEs :: [StatEnv] -> StatEnv
combineSEs = foldr combineSE emptySE
countOne :: CounterType -> StatEnv
countOne c = Map.singleton c 1
{-
************************************************************************
* *
\subsection{Top-level list of bindings (a ``program'')}
* *
************************************************************************
-}
showStgStats :: [StgTopBinding] -> String
showStgStats prog
= "STG Statistics:\n\n"
++ concatMap showc (Map.toList (gatherStgStats prog))
where
showc (x,n) = (showString (s x) . shows n) "\n"
s Literals = "Literals "
s Applications = "Applications "
s ConstructorApps = "ConstructorApps "
s PrimitiveApps = "PrimitiveApps "
s LetNoEscapes = "LetNoEscapes "
s StgCases = "StgCases "
s FreeVariables = "FreeVariables "
s (ConstructorBinds True) = "ConstructorBinds_Top "
s (ReEntrantBinds True) = "ReEntrantBinds_Top "
s (SingleEntryBinds True) = "SingleEntryBinds_Top "
s (UpdatableBinds True) = "UpdatableBinds_Top "
s (ConstructorBinds _) = "ConstructorBinds_Nested "
s (ReEntrantBinds _) = "ReEntrantBindsBinds_Nested "
s (SingleEntryBinds _) = "SingleEntryBinds_Nested "
s (UpdatableBinds _) = "UpdatableBinds_Nested "
gatherStgStats :: [StgTopBinding] -> StatEnv
gatherStgStats binds = combineSEs (map statTopBinding binds)
{-
************************************************************************
* *
\subsection{Bindings}
* *
************************************************************************
-}
statTopBinding :: StgTopBinding -> StatEnv
statTopBinding (StgTopStringLit _ _) = countOne Literals
statTopBinding (StgTopLifted bind) = statBinding True bind
statBinding :: Bool -- True <=> top-level; False <=> nested
-> StgBinding
-> StatEnv
statBinding top (StgNonRec b rhs)
= statRhs top (b, rhs)
statBinding top (StgRec pairs)
= combineSEs (map (statRhs top) pairs)
statRhs :: Bool -> (Id, StgRhs) -> StatEnv
statRhs top (_, StgRhsCon _ _ _ _ _)
= countOne (ConstructorBinds top)
statRhs top (_, StgRhsClosure _ _ u _ body)
= statExpr body `combineSE`
countOne (
case u of
ReEntrant -> ReEntrantBinds top
Updatable -> UpdatableBinds top
SingleEntry -> SingleEntryBinds top
)
{-
************************************************************************
* *
\subsection{Expressions}
* *
************************************************************************
-}
statExpr :: StgExpr -> StatEnv
statExpr (StgApp _ _) = countOne Applications
statExpr (StgLit _) = countOne Literals
statExpr (StgConApp {}) = countOne ConstructorApps
statExpr (StgOpApp _ _ _) = countOne PrimitiveApps
statExpr (StgTick _ e) = statExpr e
statExpr (StgLetNoEscape _ binds body)
= statBinding False{-not top-level-} binds `combineSE`
statExpr body `combineSE`
countOne LetNoEscapes
statExpr (StgLet _ binds body)
= statBinding False{-not top-level-} binds `combineSE`
statExpr body
statExpr (StgCase expr _ _ alts)
= statExpr expr `combineSE`
stat_alts alts `combineSE`
countOne StgCases
where
stat_alts = combineSEs . fmap (statExpr . alt_rhs)
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