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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.
#include "common.h"
#include "excep.h"
#include "log.h"
#include "methoddescbackpatchinfo.h"
#ifdef CROSSGEN_COMPILE
#error This file is not expected to be included into CrossGen
#endif
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// EntryPointSlots
#ifndef DACCESS_COMPILE
void EntryPointSlots::Backpatch_Locked(PCODE entryPoint)
{
WRAPPER_NO_CONTRACT;
static_assert_no_msg(SlotType_Count <= sizeof(INT32));
_ASSERTE(MethodDescBackpatchInfoTracker::IsLockedByCurrentThread());
_ASSERTE(entryPoint != NULL);
TADDR *slots = m_slots.GetElements();
COUNT_T slotCount = m_slots.GetCount();
for (COUNT_T i = 0; i < slotCount; ++i)
{
TADDR slot = slots[i];
SlotType slotType = (SlotType)(slot & SlotType_Mask);
slot ^= slotType;
Backpatch_Locked(slot, slotType, entryPoint);
}
}
void EntryPointSlots::Backpatch_Locked(TADDR slot, SlotType slotType, PCODE entryPoint)
{
WRAPPER_NO_CONTRACT;
static_assert_no_msg(SlotType_Count <= sizeof(INT32));
_ASSERTE(MethodDescBackpatchInfoTracker::IsLockedByCurrentThread());
_ASSERTE(slot != NULL);
_ASSERTE(!(slot & SlotType_Mask));
_ASSERTE(slotType >= SlotType_Normal);
_ASSERTE(slotType < SlotType_Count);
_ASSERTE(entryPoint != NULL);
_ASSERTE(IS_ALIGNED((SIZE_T)slot, GetRequiredSlotAlignment(slotType)));
switch (slotType)
{
case SlotType_Normal:
*(PCODE *)slot = entryPoint;
break;
case SlotType_Vtable:
((MethodTable::VTableIndir2_t *)slot)->SetValue(entryPoint);
break;
case SlotType_Executable:
*(PCODE *)slot = entryPoint;
goto Flush;
case SlotType_ExecutableRel32:
// A rel32 may require a jump stub on some architectures, and is currently not supported
_ASSERTE(sizeof(void *) <= 4);
*(PCODE *)slot = entryPoint - ((PCODE)slot + sizeof(PCODE));
// fall through
Flush:
ClrFlushInstructionCache((LPCVOID)slot, sizeof(PCODE));
break;
default:
UNREACHABLE();
break;
}
}
#endif // !DACCESS_COMPILE
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// MethodDescBackpatchInfo
#ifndef DACCESS_COMPILE
void MethodDescBackpatchInfo::AddDependentLoaderAllocator_Locked(LoaderAllocator *dependentLoaderAllocator)
{
WRAPPER_NO_CONTRACT;
_ASSERTE(MethodDescBackpatchInfoTracker::IsLockedByCurrentThread());
_ASSERTE(m_methodDesc != nullptr);
_ASSERTE(dependentLoaderAllocator != nullptr);
_ASSERTE(dependentLoaderAllocator != m_methodDesc->GetLoaderAllocator());
LoaderAllocatorSet *set = m_dependentLoaderAllocators;
if (set != nullptr)
{
if (set->Lookup(dependentLoaderAllocator) != nullptr)
{
return;
}
set->Add(dependentLoaderAllocator);
return;
}
NewHolder<LoaderAllocatorSet> setHolder = new LoaderAllocatorSet();
setHolder->Add(dependentLoaderAllocator);
m_dependentLoaderAllocators = setHolder.Extract();
}
void MethodDescBackpatchInfo::RemoveDependentLoaderAllocator_Locked(LoaderAllocator *dependentLoaderAllocator)
{
WRAPPER_NO_CONTRACT;
_ASSERTE(MethodDescBackpatchInfoTracker::IsLockedByCurrentThread());
_ASSERTE(m_methodDesc != nullptr);
_ASSERTE(dependentLoaderAllocator != nullptr);
_ASSERTE(dependentLoaderAllocator != m_methodDesc->GetLoaderAllocator());
_ASSERTE(m_dependentLoaderAllocators != nullptr);
_ASSERTE(m_dependentLoaderAllocators->Lookup(dependentLoaderAllocator) == dependentLoaderAllocator);
m_dependentLoaderAllocators->Remove(dependentLoaderAllocator);
}
#endif // !DACCESS_COMPILE
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// MethodDescBackpatchInfoTracker
CrstStatic MethodDescBackpatchInfoTracker::s_lock;
#ifndef DACCESS_COMPILE
void MethodDescBackpatchInfoTracker::StaticInitialize()
{
WRAPPER_NO_CONTRACT;
s_lock.Init(CrstMethodDescBackpatchInfoTracker);
}
#endif // DACCESS_COMPILE
#ifdef _DEBUG
bool MethodDescBackpatchInfoTracker::IsLockedByCurrentThread()
{
WRAPPER_NO_CONTRACT;
#ifndef DACCESS_COMPILE
return !!s_lock.OwnedByCurrentThread();
#else
return true;
#endif
}
bool MethodDescBackpatchInfoTracker::MayHaveEntryPointSlotsToBackpatch(PTR_MethodDesc methodDesc)
{
// The only purpose of this method is to allow asserts in inline functions defined in the .h file, by which time MethodDesc
// is not fully defined
WRAPPER_NO_CONTRACT;
return methodDesc->MayHaveEntryPointSlotsToBackpatch();
}
#endif // _DEBUG
#ifndef DACCESS_COMPILE
MethodDescBackpatchInfo *MethodDescBackpatchInfoTracker::AddBackpatchInfo_Locked(MethodDesc *methodDesc)
{
WRAPPER_NO_CONTRACT;
_ASSERTE(IsLockedByCurrentThread());
_ASSERTE(methodDesc != nullptr);
_ASSERTE(methodDesc->MayHaveEntryPointSlotsToBackpatch());
_ASSERTE(m_backpatchInfoHash.Lookup(methodDesc) == nullptr);
NewHolder<MethodDescBackpatchInfo> backpatchInfoHolder = new MethodDescBackpatchInfo(methodDesc);
m_backpatchInfoHash.Add(backpatchInfoHolder);
return backpatchInfoHolder.Extract();
}
EntryPointSlots *MethodDescBackpatchInfoTracker::GetDependencyMethodDescEntryPointSlots_Locked(MethodDesc *methodDesc)
{
WRAPPER_NO_CONTRACT;
_ASSERTE(IsLockedByCurrentThread());
_ASSERTE(methodDesc != nullptr);
_ASSERTE(methodDesc->MayHaveEntryPointSlotsToBackpatch());
MethodDescEntryPointSlots *methodDescSlots =
m_dependencyMethodDescEntryPointSlotsHash.Lookup(methodDesc);
return methodDescSlots == nullptr ? nullptr : methodDescSlots->GetSlots();
}
EntryPointSlots *MethodDescBackpatchInfoTracker::GetOrAddDependencyMethodDescEntryPointSlots_Locked(MethodDesc *methodDesc)
{
WRAPPER_NO_CONTRACT;
_ASSERTE(IsLockedByCurrentThread());
_ASSERTE(methodDesc != nullptr);
_ASSERTE(methodDesc->MayHaveEntryPointSlotsToBackpatch());
MethodDescEntryPointSlots *methodDescSlots = m_dependencyMethodDescEntryPointSlotsHash.Lookup(methodDesc);
if (methodDescSlots != nullptr)
{
return methodDescSlots->GetSlots();
}
NewHolder<MethodDescEntryPointSlots> methodDescSlotsHolder = new MethodDescEntryPointSlots(methodDesc);
m_dependencyMethodDescEntryPointSlotsHash.Add(methodDescSlotsHolder);
return methodDescSlotsHolder.Extract()->GetSlots();
}
void MethodDescBackpatchInfoTracker::ClearDependencyMethodDescEntryPointSlots(LoaderAllocator *loaderAllocator)
{
WRAPPER_NO_CONTRACT;
_ASSERTE(loaderAllocator != nullptr);
_ASSERTE(loaderAllocator->GetMethodDescBackpatchInfoTracker() == this);
ConditionalLockHolder lockHolder;
for (MethodDescEntryPointSlotsHash::Iterator
it = m_dependencyMethodDescEntryPointSlotsHash.Begin(),
itEnd = m_dependencyMethodDescEntryPointSlotsHash.End();
it != itEnd;
++it)
{
MethodDesc *methodDesc = (*it)->GetMethodDesc();
MethodDescBackpatchInfo *backpatchInfo = methodDesc->GetBackpatchInfoTracker()->GetBackpatchInfo_Locked(methodDesc);
if (backpatchInfo != nullptr)
{
backpatchInfo->RemoveDependentLoaderAllocator_Locked(loaderAllocator);
}
}
m_dependencyMethodDescEntryPointSlotsHash.RemoveAll();
}
#endif // DACCESS_COMPILE
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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