-----------------------------------------------------------------------------
--
-- Code generation for ticky-ticky profiling
--
-- (c) The University of Glasgow 2004-2006
--
-----------------------------------------------------------------------------

{-# OPTIONS -fno-warn-tabs #-}
-- The above warning supression flag is a temporary kludge.
-- While working on this module you are encouraged to remove it and
-- detab the module (please do the detabbing in a separate patch). See
--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
-- for details

module StgCmmTicky (
	emitTickyCounter,

	tickyDynAlloc,
	tickyAllocHeap,
	tickyAllocPrim,
	tickyAllocThunk,
	tickyAllocPAP,
	
	tickySlowCall, tickyDirectCall,

	tickyPushUpdateFrame,
	tickyUpdateFrameOmitted,

	tickyEnterDynCon,
	tickyEnterStaticCon,
	tickyEnterViaNode,

	tickyEnterFun, 
	tickyEnterThunk,

	tickyUpdateBhCaf,
	tickyBlackHole,
	tickyUnboxedTupleReturn, tickyVectoredReturn,
	tickyReturnOldCon, tickyReturnNewCon,

	tickyKnownCallTooFewArgs, tickyKnownCallExact, tickyKnownCallExtraArgs,
	tickyUnknownCall, tickySlowCallPat,

       staticTickyHdr,
  ) where

#include "HsVersions.h"
#include "../includes/dist-derivedconstants/header/DerivedConstants.h"
	-- For REP_xxx constants, which are MachReps

import StgCmmClosure
import StgCmmUtils
import StgCmmMonad

import StgSyn
import CmmExpr
import MkGraph
import CmmUtils
import CLabel
import SMRep

import Module
import Name
import Id
import BasicTypes
import FastString
import Constants
import Outputable

import DynFlags

-- Turgid imports for showTypeCategory
import PrelNames
import TcType
import Type
import TyCon

import Data.Maybe

-----------------------------------------------------------------------------
--
--		Ticky-ticky profiling
--
-----------------------------------------------------------------------------

staticTickyHdr :: [CmmLit]
-- krc: not using this right now --
-- in the new version of ticky-ticky, we
-- don't change the closure layout.
-- leave it defined, though, to avoid breaking
-- other things.
staticTickyHdr = []

emitTickyCounter :: ClosureInfo -> [Id] -> FCode ()
emitTickyCounter cl_info args
  = ifTicky $
    do	{ dflags <- getDynFlags
        ; mod_name <- getModuleName
        ; let ticky_ctr_label = closureRednCountsLabel cl_info
              arg_descr = map (showTypeCategory . idType) args
              fun_descr mod_name = ppr_for_ticky_name dflags mod_name (closureName cl_info)
	; fun_descr_lit <- newStringCLit (fun_descr mod_name)
	; arg_descr_lit <- newStringCLit arg_descr
	; emitDataLits ticky_ctr_label 	-- Must match layout of StgEntCounter
-- krc: note that all the fields are I32 now; some were I16 before, 
-- but the code generator wasn't handling that properly and it led to chaos, 
-- panic and disorder.
	    [ mkIntCLit 0,
	      mkIntCLit (length args),	-- Arity
	      mkIntCLit 0,		-- XXX: we no longer know this!  Words passed on stack
	      fun_descr_lit,
	      arg_descr_lit,
	      zeroCLit, 		-- Entry count
	      zeroCLit, 		-- Allocs
	      zeroCLit 			-- Link
	    ] }

-- When printing the name of a thing in a ticky file, we want to
-- give the module name even for *local* things.   We print
-- just "x (M)" rather that "M.x" to distinguish them from the global kind.
ppr_for_ticky_name :: DynFlags -> Module -> Name -> String
ppr_for_ticky_name dflags mod_name name
  | isInternalName name = showSDocDebug dflags (ppr name <+> (parens (ppr mod_name)))
  | otherwise           = showSDocDebug dflags (ppr name)

-- -----------------------------------------------------------------------------
-- Ticky stack frames

tickyPushUpdateFrame, tickyUpdateFrameOmitted :: FCode ()
tickyPushUpdateFrame    = ifTicky $ bumpTickyCounter (fsLit "UPDF_PUSHED_ctr")
tickyUpdateFrameOmitted = ifTicky $ bumpTickyCounter (fsLit "UPDF_OMITTED_ctr")

-- -----------------------------------------------------------------------------
-- Ticky entries

tickyEnterDynCon, tickyEnterDynThunk, tickyEnterStaticCon,
    tickyEnterStaticThunk, tickyEnterViaNode :: FCode ()
tickyEnterDynCon      = ifTicky $ bumpTickyCounter (fsLit "ENT_DYN_CON_ctr")
tickyEnterDynThunk    = ifTicky $ bumpTickyCounter (fsLit "ENT_DYN_THK_ctr")
tickyEnterStaticCon   = ifTicky $ bumpTickyCounter (fsLit "ENT_STATIC_CON_ctr")
tickyEnterStaticThunk = ifTicky $ bumpTickyCounter (fsLit "ENT_STATIC_THK_ctr")
tickyEnterViaNode     = ifTicky $ bumpTickyCounter (fsLit "ENT_VIA_NODE_ctr")

tickyEnterThunk :: ClosureInfo -> FCode ()
tickyEnterThunk cl_info
  | isStaticClosure cl_info = tickyEnterStaticThunk
  | otherwise		    = tickyEnterDynThunk

tickyBlackHole :: Bool{-updatable-} -> FCode ()
tickyBlackHole updatable
  = ifTicky (bumpTickyCounter ctr)
  where
    ctr | updatable = (fsLit "UPD_BH_SINGLE_ENTRY_ctr")
	| otherwise = (fsLit "UPD_BH_UPDATABLE_ctr")

tickyUpdateBhCaf :: ClosureInfo -> FCode ()
tickyUpdateBhCaf cl_info
  = ifTicky (bumpTickyCounter ctr)
  where
    ctr | closureUpdReqd cl_info = (fsLit "UPD_CAF_BH_SINGLE_ENTRY_ctr")
	| otherwise	         = (fsLit "UPD_CAF_BH_UPDATABLE_ctr")

tickyEnterFun :: ClosureInfo -> FCode ()
tickyEnterFun cl_info
  = ifTicky $ 
    do 	{ bumpTickyCounter ctr
	; fun_ctr_lbl <- getTickyCtrLabel
	; registerTickyCtr fun_ctr_lbl
	; bumpTickyCounter' (cmmLabelOffB fun_ctr_lbl oFFSET_StgEntCounter_entry_count)
        }
  where
    ctr | isStaticClosure cl_info = (fsLit "ENT_STATIC_FUN_DIRECT_ctr")
	| otherwise		  = (fsLit "ENT_DYN_FUN_DIRECT_ctr")

registerTickyCtr :: CLabel -> FCode ()
-- Register a ticky counter
--   if ( ! f_ct.registeredp ) {
--	    f_ct.link = ticky_entry_ctrs; 	/* hook this one onto the front of the list */
--	    ticky_entry_ctrs = & (f_ct);	/* mark it as "registered" */
--	    f_ct.registeredp = 1 }
registerTickyCtr ctr_lbl
  = emit =<< mkCmmIfThen test (catAGraphs register_stmts)
  where
    -- krc: code generator doesn't handle Not, so we test for Eq 0 instead
    test = CmmMachOp (MO_Eq wordWidth)
              [CmmLoad (CmmLit (cmmLabelOffB ctr_lbl 
				oFFSET_StgEntCounter_registeredp)) bWord,
               CmmLit (mkIntCLit 0)]
    register_stmts
      =	[ mkStore (CmmLit (cmmLabelOffB ctr_lbl oFFSET_StgEntCounter_link))
		   (CmmLoad ticky_entry_ctrs bWord)
	, mkStore ticky_entry_ctrs (mkLblExpr ctr_lbl)
	, mkStore (CmmLit (cmmLabelOffB ctr_lbl 
				oFFSET_StgEntCounter_registeredp))
		   (CmmLit (mkIntCLit 1)) ]
    ticky_entry_ctrs = mkLblExpr (mkCmmDataLabel rtsPackageId (fsLit "ticky_entry_ctrs"))

tickyReturnOldCon, tickyReturnNewCon :: RepArity -> FCode ()
tickyReturnOldCon arity 
  = ifTicky $ do { bumpTickyCounter (fsLit "RET_OLD_ctr")
	         ; bumpHistogram    (fsLit "RET_OLD_hst") arity }
tickyReturnNewCon arity 
  = ifTicky $ do { bumpTickyCounter (fsLit "RET_NEW_ctr")
	         ; bumpHistogram    (fsLit "RET_NEW_hst") arity }

tickyUnboxedTupleReturn :: RepArity -> FCode ()
tickyUnboxedTupleReturn arity
  = ifTicky $ do { bumpTickyCounter (fsLit "RET_UNBOXED_TUP_ctr")
 	         ; bumpHistogram    (fsLit "RET_UNBOXED_TUP_hst") arity }

tickyVectoredReturn :: Int -> FCode ()
tickyVectoredReturn family_size 
  = ifTicky $ do { bumpTickyCounter (fsLit "VEC_RETURN_ctr")
		 ; bumpHistogram    (fsLit "RET_VEC_RETURN_hst") family_size }

-- -----------------------------------------------------------------------------
-- Ticky calls

-- Ticks at a *call site*:
tickyDirectCall :: RepArity -> [StgArg] -> FCode ()
tickyDirectCall arity args
  | arity == length args = tickyKnownCallExact
  | otherwise = do tickyKnownCallExtraArgs
		   tickySlowCallPat (map argPrimRep (drop arity args))

tickyKnownCallTooFewArgs :: FCode ()
tickyKnownCallTooFewArgs = ifTicky $ bumpTickyCounter (fsLit "KNOWN_CALL_TOO_FEW_ARGS_ctr")

tickyKnownCallExact :: FCode ()
tickyKnownCallExact      = ifTicky $ bumpTickyCounter (fsLit "KNOWN_CALL_ctr")

tickyKnownCallExtraArgs :: FCode ()
tickyKnownCallExtraArgs  = ifTicky $ bumpTickyCounter (fsLit "KNOWN_CALL_EXTRA_ARGS_ctr")

tickyUnknownCall :: FCode ()
tickyUnknownCall         = ifTicky $ bumpTickyCounter (fsLit "UNKNOWN_CALL_ctr")

-- Tick for the call pattern at slow call site (i.e. in addition to
-- tickyUnknownCall, tickyKnownCallExtraArgs, etc.)
tickySlowCall :: LambdaFormInfo -> [StgArg] -> FCode ()
tickySlowCall _ []
  = return ()
tickySlowCall lf_info args 
  = do	{ if (isKnownFun lf_info) 
		then tickyKnownCallTooFewArgs
		else tickyUnknownCall
	; tickySlowCallPat (map argPrimRep args) }

tickySlowCallPat :: [PrimRep] -> FCode ()
tickySlowCallPat _args = return ()
{- LATER: (introduces recursive module dependency now).
  case callPattern args of
    (str, True)  -> bumpTickyCounter' (mkRtsSlowTickyCtrLabel pat)
    (str, False) -> bumpTickyCounter  (sLit "TICK_SLOW_CALL_OTHER")

-- Don't use CgRep; put this function in StgCmmLayout
callPattern :: [CgRep] -> (String,Bool)
callPattern reps 
  | match == length reps = (chars, True)
  | otherwise            = (chars, False)
  where (_,match) = findMatch reps
	chars     = map argChar reps

argChar VoidArg   = 'v'
argChar PtrArg    = 'p'
argChar NonPtrArg = 'n'
argChar LongArg   = 'l'
argChar FloatArg  = 'f'
argChar DoubleArg = 'd'
-}

-- -----------------------------------------------------------------------------
-- Ticky allocation

tickyDynAlloc :: SMRep -> LambdaFormInfo -> FCode ()
-- Called when doing a dynamic heap allocation
-- LambdaFormInfo only needed to distinguish between updatable/non-updatable thunks
tickyDynAlloc rep lf
  = ifTicky $
    case () of
      _ | isConRep rep   -> tick_alloc_con
        | isThunkRep rep -> tick_alloc_thk
        | isFunRep   rep -> tick_alloc_fun
        | otherwise      -> return ()
  where
        -- will be needed when we fill in stubs
--    _cl_size   = heapClosureSize rep
--    _slop_size = slopSize cl_info

    tick_alloc_thk 
        | lfUpdatable lf = tick_alloc_up_thk
        | otherwise      = tick_alloc_se_thk

    -- krc: changed from panic to return () 
    -- just to get something working
    tick_alloc_con = return ()
    tick_alloc_fun = return ()
    tick_alloc_up_thk = return ()
    tick_alloc_se_thk = return ()


tickyAllocPrim :: CmmExpr -> CmmExpr -> CmmExpr -> FCode ()
tickyAllocPrim _hdr _goods _slop = ifTicky $ pprTrace "ToDo: tickyAllocPrim" empty (return ())

tickyAllocThunk :: CmmExpr -> CmmExpr -> FCode ()
tickyAllocThunk _goods _slop = ifTicky $ pprTrace "ToDo: tickyAllocThunk" empty (return ())

tickyAllocPAP :: CmmExpr -> CmmExpr -> FCode ()
tickyAllocPAP _goods _slop = ifTicky $ pprTrace "ToDo: tickyAllocPAP" empty (return ())

tickyAllocHeap :: VirtualHpOffset -> FCode ()
-- Called when doing a heap check [TICK_ALLOC_HEAP]
-- Must be lazy in the amount of allocation!
tickyAllocHeap hp
  = ifTicky $
    do	{ ticky_ctr <- getTickyCtrLabel
	; emit $ catAGraphs $
	  if hp == 0 then [] 	-- Inside the emitMiddle to avoid control
	  else [		-- dependency on the argument
		-- Bump the allcoation count in the StgEntCounter
	    addToMem REP_StgEntCounter_allocs 
			(CmmLit (cmmLabelOffB ticky_ctr 
				oFFSET_StgEntCounter_allocs)) hp,
		-- Bump ALLOC_HEAP_ctr
	    addToMemLbl cLong (mkCmmDataLabel rtsPackageId (fsLit "ALLOC_HEAP_ctr")) 1,
		-- Bump ALLOC_HEAP_tot
	    addToMemLbl cLong (mkCmmDataLabel rtsPackageId (fsLit "ALLOC_HEAP_tot")) hp] }

-- -----------------------------------------------------------------------------
-- Ticky utils

ifTicky :: FCode () -> FCode ()
ifTicky code = do dflags <- getDynFlags
                  if doingTickyProfiling dflags then code
                                                else nopC

-- All the ticky-ticky counters are declared "unsigned long" in C
bumpTickyCounter :: FastString -> FCode ()
bumpTickyCounter lbl = bumpTickyCounter' (cmmLabelOffB (mkCmmDataLabel rtsPackageId lbl) 0)

bumpTickyCounter' :: CmmLit -> FCode ()
-- krc: note that we're incrementing the _entry_count_ field of the ticky counter
bumpTickyCounter' lhs = emit (addToMem cLong (CmmLit lhs) 1)

bumpHistogram :: FastString -> Int -> FCode ()
bumpHistogram _lbl _n
--  = bumpHistogramE lbl (CmmLit (CmmInt (fromIntegral n) cLongWidth))
    = return ()	   -- TEMP SPJ Apr 07

{-
bumpHistogramE :: LitString -> CmmExpr -> FCode ()
bumpHistogramE lbl n 
  = do  t <- newTemp cLong
        emitAssign (CmmLocal t) n
	emit (mkCmmIfThen (CmmMachOp (MO_U_Le cLongWidth) [CmmReg (CmmLocal t), eight])
	  		  (mkAssign (CmmLocal t) eight))
	emit (addToMem cLong
		       (cmmIndexExpr cLongWidth
				(CmmLit (CmmLabel (mkRtsDataLabel lbl)))
				(CmmReg (CmmLocal t)))
		       1)
  where 
   eight = CmmLit (CmmInt 8 cLongWidth)
-}

------------------------------------------------------------------
-- Showing the "type category" for ticky-ticky profiling

showTypeCategory :: Type -> Char
  {-	{C,I,F,D}   char, int, float, double
	T	    tuple
	S	    other single-constructor type
	{c,i,f,d}   unboxed ditto
	t	    *unpacked* tuple
	s	    *unpacked" single-cons...

	v	    void#
	a	    primitive array

	E	    enumeration type
	+	    dictionary, unless it's a ...
	L	    List
	>	    function
	M	    other (multi-constructor) data-con type
	.	    other type
	-	    reserved for others to mark as "uninteresting"
    -}
showTypeCategory ty
  = if isDictTy ty
    then '+'
    else
      case tcSplitTyConApp_maybe ty of
	Nothing -> if isJust (tcSplitFunTy_maybe ty)
		   then '>'
		   else '.'

	Just (tycon, _) ->
          let utc = getUnique tycon in
	  if	  utc == charDataConKey    then 'C'
	  else if utc == intDataConKey     then 'I'
	  else if utc == floatDataConKey   then 'F'
	  else if utc == doubleDataConKey  then 'D'
	  else if utc == charPrimTyConKey  then 'c'
	  else if (utc == intPrimTyConKey || utc == wordPrimTyConKey
		|| utc == addrPrimTyConKey)		   then 'i'
	  else if utc  == floatPrimTyConKey		   then 'f'
	  else if utc  == doublePrimTyConKey		   then 'd'
	  else if isPrimTyCon tycon {- array, we hope -}   then 'A'	-- Bogus
	  else if isEnumerationTyCon tycon		   then 'E'
	  else if isTupleTyCon tycon			   then 'T'
	  else if isJust (tyConSingleDataCon_maybe tycon)       then 'S'
	  else if utc == listTyConKey			   then 'L'
	  else 'M' -- oh, well...
