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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.
#pragma once
class GenericUnificationHashtable
{
struct Entry
{
Entry * m_nextInHash;
GenericUnificationDesc * m_desc;
UIntTarget * m_indirCells;
Entry(Entry *next, GenericUnificationDesc *desc, UIntTarget *indirCells) : m_nextInHash(next), m_desc(desc), m_indirCells(indirCells)
{
}
};
Entry ** m_table; // table of hash buckets
UInt32 m_tableSize; // size of the table - always a power of two
UInt32 m_hashMask; // mask to AND hash code with
UInt32 m_entryCount; // number of entries in table
#ifdef _DEBUG
#define GENERIC_UNIFICATION_STATS
#endif
#if defined(GENERIC_UNIFICATION_STATS)
UInt32 m_duplicateCount; // number of duplicate generic unification descs found so far
UInt32 m_indirCellCount; // number of indirection cells found so far
UInt64 m_elapsedTicks; // number of "ticks" spent so far - either clock cycles (x86) or milliseconds
#endif
// grow the size of the hash table to at least minSize
bool GrowTable(UInt32 minSize);
// unify one generic type or method
bool UnifyDesc(GenericUnificationDesc *pDesc, UIntTarget *pIndirCells);
// this generic type or method is not a duplicate - enter it into the hash table
bool EnterDesc(GenericUnificationDesc *pDesc, UIntTarget *pIndirCells);
// we have found a duplicate - copy the indirection cells from the winner over those from the loser
void CopyIndirCells(Entry *pWinnerEntry, GenericUnificationDesc *pLoserDesc, UIntTarget *pLoserIndirCells);
public:
GenericUnificationHashtable() : m_table(nullptr), m_tableSize(0), m_hashMask(0), m_entryCount(0)
#if defined(GENERIC_UNIFICATION_STATS)
, m_duplicateCount(0), m_indirCellCount(0), m_elapsedTicks(0)
#endif
{
}
// unify an array of descriptors describing a parallel array of indirection cells
bool UnifyDescs(GenericUnificationDesc *descs, UInt32 descCount, UIntTarget *pIndirCells, UInt32 indirCellCount);
};
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