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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
// ===========================================================================
// File: CallCounter.h
//
// ===========================================================================
#ifndef CALL_COUNTER_H
#define CALL_COUNTER_H
#ifdef FEATURE_TIERED_COMPILATION
// One entry in our dictionary mapping methods to the number of times they
// have been invoked
struct CallCounterEntry
{
CallCounterEntry() {}
CallCounterEntry(PTR_MethodDesc m, const int callCountLimit)
: pMethod(m), callCountLimit(callCountLimit) {}
PTR_MethodDesc pMethod;
int callCountLimit;
#ifndef DACCESS_COMPILE
static CallCounterEntry CreateWithCallCountingDisabled(MethodDesc *m);
#endif
bool IsCallCountingEnabled() const
{
LIMITED_METHOD_CONTRACT;
return callCountLimit != INT_MAX;
}
#ifndef DACCESS_COMPILE
void DisableCallCounting()
{
LIMITED_METHOD_CONTRACT;
callCountLimit = INT_MAX;
}
#endif
};
typedef DPTR(struct CallCounterEntry) PTR_CallCounterEntry;
class CallCounterHashTraits : public DefaultSHashTraits<CallCounterEntry>
{
public:
typedef typename DefaultSHashTraits<CallCounterEntry>::element_t element_t;
typedef typename DefaultSHashTraits<CallCounterEntry>::count_t count_t;
typedef PTR_MethodDesc key_t;
static key_t GetKey(element_t e)
{
LIMITED_METHOD_CONTRACT;
return e.pMethod;
}
static BOOL Equals(key_t k1, key_t k2)
{
LIMITED_METHOD_CONTRACT;
return k1 == k2;
}
static count_t Hash(key_t k)
{
LIMITED_METHOD_CONTRACT;
return (count_t)dac_cast<TADDR>(k);
}
static const element_t Null() { LIMITED_METHOD_CONTRACT; return element_t(PTR_NULL, 0); }
static const element_t Deleted() { LIMITED_METHOD_CONTRACT; return element_t((PTR_MethodDesc)-1, 0); }
static bool IsNull(const element_t &e) { LIMITED_METHOD_CONTRACT; return e.pMethod == PTR_NULL; }
static bool IsDeleted(const element_t &e) { return e.pMethod == (PTR_MethodDesc)-1; }
};
typedef SHash<NoRemoveSHashTraits<CallCounterHashTraits>> CallCounterHash;
// This is a per-appdomain cache of call counts for all code in that AppDomain.
// Each method invocation should trigger a call to OnMethodCalled (until it is disabled per-method)
// and the CallCounter will forward the call to the TieredCompilationManager including the
// current call count.
class CallCounter
{
public:
#ifdef DACCESS_COMPILE
CallCounter() {}
#else
CallCounter();
#endif
static bool IsEligibleForCallCounting(PTR_MethodDesc pMethodDesc);
bool IsCallCountingEnabled(PTR_MethodDesc pMethodDesc);
#ifndef DACCESS_COMPILE
void DisableCallCounting(MethodDesc* pMethodDesc);
bool WasCalledAtMostOnce(MethodDesc* pMethodDesc);
#endif
void OnMethodCalled(MethodDesc* pMethodDesc, TieredCompilationManager *pTieredCompilationManager, BOOL* shouldStopCountingCallsRef, BOOL* wasPromotedToNextTierRef);
private:
// fields protected by lock
SpinLock m_lock;
CallCounterHash m_methodToCallCount;
};
#endif // FEATURE_TIERED_COMPILATION
#endif // CALL_COUNTER_H
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