// sampler.cpp+
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// +
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// Copyright (c) 2010 Accenture. All rights reserved.+
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// This component and the accompanying materials are made available+
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// under the terms of the "Eclipse Public License v1.0"+
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// which accompanies this distribution, and is available+
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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// +
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// Initial Contributors:+
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// Accenture - Initial contribution+
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//+
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#include "sampler.h"+
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#include <fshell/btrace_parser_defs.h>+
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#include <fshell/common.mmh>+
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+
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// Please note this code is NOT SMP-safe. The whole mechanism of using an interrupt doesn't work under SMP so there's no point adding TSpinLocks or similar+
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#ifdef __SMP__+
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#error "Sampler doesn't work under SMP!"+
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#endif+
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+
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TUint IntStackPtr();+
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TUint IDFCRunning();+
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+
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DCpuSampler::DCpuSampler()+
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	: iTimer(NTimer(&Sample, this))+
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	{+
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#if defined(__MARM__)+
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	iIntStackTop=(TUint*)IntStackPtr();+
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#endif+
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	}+
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+
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DCpuSampler::~DCpuSampler()+
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	{+
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	iTimer.Cancel();+
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	}+
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+
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void DCpuSampler::Sample(TAny* aPtr)+
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	{+
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	static_cast<DCpuSampler*>(aPtr)->DoSample();+
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	}+
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+
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void DCpuSampler::DoSample()+
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	{+
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	TInt err = iTimer.Again(1);+
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	if (err == KErrArgument)+
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		{+
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		// Missed a tick, oh well+
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		iTimer.OneShot(1);+
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		}+
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+
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	NThread* thread = NKern::CurrentThread();+
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	if (iCpuUsageCallbackFn)+
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		{+
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		// Not used by anything in fshell pkg+
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		(*iCpuUsageCallbackFn)(iContext, thread);+
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		}+
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+
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	if (iProfiling)+
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		{+
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		Usample(thread);+
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		}+
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	iContext = thread;+
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	}+
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+
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TBool DCpuSampler::ShouldRun() const+
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	{+
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	return iProfiling || iCpuUsageCallbackFn != NULL;+
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	}+
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+
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void DCpuSampler::SettingsChanged()+
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	{+
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	// Call with interrupts disabled+
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	if (ShouldRun())+
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		{+
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#if FSHELL_PLATFORM_SYMTB >= 92+
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		if (!iTimer.IsPending())+
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#else+
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		if (iTimer.iState == NTimer::EIdle)+
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#endif+
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			{+
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			iContext = NULL;+
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			iTimerHeartbeat = 0;+
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			iTimer.OneShot(1);+
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			}+
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		}+
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	else+
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		{+
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		iTimer.Cancel();+
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		}+
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	}+
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+
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void DCpuSampler::SetCpuUsageSampling(MExtraBtrace::TCpuUsageCallback aCallbackFn)+
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	{+
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	TUint irq = NKern::DisableAllInterrupts();+
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	iCpuUsageCallbackFn = aCallbackFn;+
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	SettingsChanged();+
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	NKern::RestoreInterrupts(irq);+
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	}+
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+
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+
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void DCpuSampler::SetProfilingSampling(TBool aEnabled)+
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	{+
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	TUint irq = NKern::DisableAllInterrupts();+
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	iProfiling = aEnabled;+
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	SettingsChanged();+
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	NKern::RestoreInterrupts(irq);+
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	}+
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+
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void DCpuSampler::Usample(NThread* pN)+
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	{+
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	if (Kern::NThreadToDThread(pN)!=NULL)+
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		{+
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#if defined(__MARM__)+
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		TBool idfcRunning = IDFCRunning();+
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		TLinAddr pC=((iIntStackTop)[-1]) & ~1; //clear LSB bit (in case of Jazelle code)+
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#else+
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		// Can't get this info if we don't have the .cia functions+
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		TBool idfcRunning = EFalse;+
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		TLinAddr pC = 0;+
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#endif+
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+
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		if (idfcRunning)+
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			{+
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			//no useful thread context+
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			BTrace4(BTrace::EProfiling,BTrace::ECpuIdfcSample,pC);+
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			}+
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		else+
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		    {+
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			if (iContext!=pN)+
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				{+
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				BTrace8(BTrace::EProfiling,BTrace::ECpuFullSample,pC,pN);+
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				}+
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			else+
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				{+
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				//optimisation - context of previous sample is assumed+
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				BTrace4(BTrace::EProfiling,BTrace::ECpuOptimisedSample,pC);+
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				}+
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 		    }+
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		}+
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	else+
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		{+
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		BTrace0(BTrace::EProfiling,BTrace::ECpuNonSymbianThreadSample);+
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		}+
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	}+
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