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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.
//
// Hash table associated with each module that records for all types defined in that module the mapping
// between type name and token (or TypeHandle).
//
#include "common.h"
#include "typeequivalencehash.hpp"
#include "ngenhash.inl"
#ifdef FEATURE_TYPEEQUIVALENCE
TypeEquivalenceHashTable::EquivalenceMatch TypeEquivalenceHashTable::CheckEquivalence(TypeHandle thA, TypeHandle thB)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;
LookupContext lookupContext;
NgenHashValue hash = TypeEquivalenceEntry::HashTypeHandles(thA, thB);
PTR_TypeEquivalenceEntry search = BaseFindFirstEntryByHash(hash, &lookupContext);
while (search != NULL)
{
if (search->Match(thA, thB))
{
return search->GetEquivalence() ? Match : NoMatch;
}
search = BaseFindNextEntryByHash(&lookupContext);
}
return MatchUnknown;
}
#ifndef DACCESS_COMPILE
/*static*/
TypeEquivalenceHashTable *TypeEquivalenceHashTable::Create(AppDomain *pAppDomain, DWORD dwNumBuckets, CrstExplicitInit *pCrst)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
INJECT_FAULT(COMPlusThrowOM(););
}
CONTRACTL_END;
AllocMemTracker amt;
LoaderHeap *pHeap = pAppDomain->GetLowFrequencyHeap();
TypeEquivalenceHashTable *pThis = (TypeEquivalenceHashTable*)amt.Track(pHeap->AllocMem((S_SIZE_T)sizeof(TypeEquivalenceHashTable)));
// The base class get initialized through chaining of constructors. We allocated the hash instance via the
// loader heap instead of new so use an in-place new to call the constructors now.
new (pThis) TypeEquivalenceHashTable(pHeap, dwNumBuckets, pCrst);
amt.SuppressRelease();
return pThis;
}
void TypeEquivalenceHashTable::RecordEquivalence(TypeHandle thA, TypeHandle thB, TypeEquivalenceHashTable::EquivalenceMatch match)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
INJECT_FAULT(COMPlusThrowOM(););
PRECONDITION(match != TypeEquivalenceHashTable::MatchUnknown);
}
CONTRACTL_END;
CrstHolder ch(m_pHashTableCrst);
// Was there a race in calculating equivalence and this thread lost?
// If so, return
EquivalenceMatch checkedMatch = CheckEquivalence(thA, thB);
if (checkedMatch != TypeEquivalenceHashTable::MatchUnknown)
{
_ASSERTE(checkedMatch == match);
return;
}
AllocMemTracker amt;
PTR_TypeEquivalenceEntry pNewEntry = BaseAllocateEntry(&amt);
amt.SuppressRelease();
pNewEntry->SetData(thA, thB, match == TypeEquivalenceHashTable::Match ? true : false);
NgenHashValue hash = TypeEquivalenceEntry::HashTypeHandles(thA, thB);
BaseInsertEntry(hash, pNewEntry);
}
#endif // !DACCESS_COMPILE
#endif // FEATURE_TYPEEQUIVALENCE
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