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%
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1994
%
\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}
\begin{code}
#include "HsVersions.h"
module StgStats ( showStgStats ) where
import StgSyn
import FiniteMap
import Util
\end{code}
\begin{code}
data CounterType
= AlgCases
| PrimCases
| LetNoEscapes
| NonUpdatableLets
| UpdatableLets
| Applications
| PrimitiveApps
| FreeVariables
| Closures -- does not include lets bound to constructors
--| UpdatableTopLevelDefs
--| NonUpdatableTopLevelDefs
| Constructors
deriving (Eq, Ord, Text)
type Count = Int
type StatEnv = FiniteMap CounterType Count
\end{code}
\begin{code}
emptySE :: StatEnv
emptySE = emptyFM
combineSE :: StatEnv -> StatEnv -> StatEnv
combineSE = plusFM_C (+)
combineSEs :: [StatEnv] -> StatEnv
combineSEs = foldr combineSE emptySE
countOne :: CounterType -> StatEnv
countOne c = singletonFM c 1
countN :: CounterType -> Int -> StatEnv
countN = singletonFM
\end{code}
%************************************************************************
%* *
\subsection{Top-level list of bindings (a ``program'')}
%* *
%************************************************************************
\begin{code}
showStgStats :: PlainStgProgram -> String
showStgStats prog = concat (map showc (fmToList (gatherStgStats prog)))
where
showc (AlgCases,n) = "AlgCases " ++ show n ++ "\n"
showc (PrimCases,n) = "PrimCases " ++ show n ++ "\n"
showc (LetNoEscapes,n) = "LetNoEscapes " ++ show n ++ "\n"
showc (NonUpdatableLets,n) = "NonUpdatableLets " ++ show n ++ "\n"
showc (UpdatableLets,n) = "UpdatableLets " ++ show n ++ "\n"
showc (Applications,n) = "Applications " ++ show n ++ "\n"
showc (PrimitiveApps,n) = "PrimitiveApps " ++ show n ++ "\n"
showc (Closures,n) = "Closures " ++ show n ++ "\n"
showc (FreeVariables,n) = "Free Vars in Closures " ++ show n ++ "\n"
showc (Constructors,n) = "Constructors " ++ show n ++ "\n"
gatherStgStats :: PlainStgProgram -> StatEnv
gatherStgStats binds
= combineSEs (map statBinding binds)
\end{code}
%************************************************************************
%* *
\subsection{Bindings}
%* *
%************************************************************************
\begin{code}
statBinding :: PlainStgBinding -> StatEnv
statBinding (StgNonRec b rhs)
= statRhs (b, rhs)
statBinding (StgRec pairs)
= combineSEs (map statRhs pairs)
statRhs :: (Id, PlainStgRhs) -> StatEnv
statRhs (b, StgRhsCon cc con args)
= countOne Constructors `combineSE`
countOne NonUpdatableLets
statRhs (b, StgRhsClosure cc bi fv u args body)
= statExpr body `combineSE`
countN FreeVariables (length fv) `combineSE`
countOne Closures `combineSE`
(case u of
Updatable -> countOne UpdatableLets
_ -> countOne NonUpdatableLets)
\end{code}
%************************************************************************
%* *
\subsection{Expressions}
%* *
%************************************************************************
\begin{code}
statExpr :: PlainStgExpr -> StatEnv
statExpr (StgApp _ [] lvs)
= emptySE
statExpr (StgApp _ _ lvs)
= countOne Applications
statExpr (StgConApp con as lvs)
= countOne Constructors
statExpr (StgPrimApp op as lvs)
= countOne PrimitiveApps
statExpr (StgSCC ty l e)
= statExpr e
statExpr (StgLetNoEscape lvs_whole lvs_rhss binds body)
= statBinding binds `combineSE`
statExpr body `combineSE`
countOne LetNoEscapes
statExpr (StgLet binds body)
= statBinding binds `combineSE`
statExpr body
statExpr (StgCase expr lve lva uniq alts)
= statExpr expr `combineSE`
stat_alts alts
where
stat_alts (StgAlgAlts ty alts def)
= combineSEs (map stat_alg_alt alts) `combineSE`
stat_deflt def `combineSE`
countOne AlgCases
where
stat_alg_alt (id, bs, use_mask, e)
= statExpr e
stat_alts (StgPrimAlts ty alts def)
= combineSEs (map stat_prim_alt alts) `combineSE`
stat_deflt def `combineSE`
countOne PrimCases
where
stat_prim_alt (l, e)
= statExpr e
stat_deflt StgNoDefault
= emptySE
stat_deflt (StgBindDefault b u expr)
= statExpr expr
\end{code}
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