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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.
// ===========================================================================
// File: onstackreplacement.cpp
//
// ===========================================================================
#include "common.h"
#include "onstackreplacement.h"
#ifdef FEATURE_ON_STACK_REPLACEMENT
CrstStatic OnStackReplacementManager::s_lock;
#if _DEBUG
int OnStackReplacementManager::s_patchpointId = 0;
#endif
#ifndef DACCESS_COMPILE
void OnStackReplacementManager::StaticInitialize()
{
WRAPPER_NO_CONTRACT;
s_lock.Init(CrstJitPatchpoint, CrstFlags(CRST_UNSAFE_COOPGC));
}
OnStackReplacementManager::OnStackReplacementManager(LoaderAllocator * loaderAllocator) : m_allocator(loaderAllocator), m_jitPatchpointTable()
{
CONTRACTL
{
GC_NOTRIGGER;
CAN_TAKE_LOCK;
MODE_ANY;
}
CONTRACTL_END;
LockOwner lock = {&s_lock, IsOwnerOfCrst};
m_jitPatchpointTable.Init(INITIAL_TABLE_SIZE, &lock, m_allocator->GetLowFrequencyHeap());
}
// Fetch or create patchpoint info for this patchpoint.
PerPatchpointInfo* OnStackReplacementManager::GetPerPatchpointInfo(PCODE ip)
{
CONTRACTL
{
GC_NOTRIGGER;
CAN_TAKE_LOCK;
MODE_COOPERATIVE;
}
CONTRACTL_END;
PTR_PCODE ppId = dac_cast<PTR_PCODE>(ip);
PTR_PerPatchpointInfo ppInfo = NULL;
BOOL hasData = m_jitPatchpointTable.GetValueSpeculative(ppId, (HashDatum*)&ppInfo);
if (!hasData)
{
CrstHolder lock(&s_lock);
hasData = m_jitPatchpointTable.GetValue(ppId, (HashDatum*)&ppInfo);
if (!hasData)
{
void * pMem = m_allocator->GetLowFrequencyHeap()->AllocMem(S_SIZE_T(sizeof(PerPatchpointInfo)));
ppInfo = dac_cast<PTR_PerPatchpointInfo>(new (pMem) PerPatchpointInfo());
m_jitPatchpointTable.InsertValue(ppId, (HashDatum)ppInfo);
#if _DEBUG
ppInfo->m_patchpointId = ++s_patchpointId;
#endif
}
}
return ppInfo;
}
#endif // !DACCESS_COMPILE
#endif // FEATURE_ON_STACK_REPLACEMENT
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