mirror of
https://github.com/RetroDECK/Supermodel.git
synced 2024-11-23 22:25:41 +00:00
156 lines
3.7 KiB
C++
156 lines
3.7 KiB
C++
/**
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** Supermodel
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** A Sega Model 3 Arcade Emulator.
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** Copyright 2011 Bart Trzynadlowski, Nik Henson
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**
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** This file is part of Supermodel.
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**
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** Supermodel is free software: you can redistribute it and/or modify it under
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** the terms of the GNU General Public License as published by the Free
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** Software Foundation, either version 3 of the License, or (at your option)
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** any later version.
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**
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** Supermodel is distributed in the hope that it will be useful, but WITHOUT
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** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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** FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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** more details.
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**
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** You should have received a copy of the GNU General Public License along
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** with Supermodel. If not, see <http://www.gnu.org/licenses/>.
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**/
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/*
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* AddressTable.h
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*/
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#ifdef SUPERMODEL_DEBUGGER
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#ifndef INCLUDED_ADDRESSTABLE_H
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#define INCLUDED_ADDRESSTABLE_H
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#include "Types.h"
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#include <vector>
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#include <algorithm>
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#define TABLE_WIDTH 16
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#define TABLE_SIZE (1 << TABLE_WIDTH)
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#define TABLE_MASK (TABLE_SIZE - 1)
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#define INDEX_SHIFT TABLE_WIDTH
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#define NUM_TABLES (0x100000000ULL / TABLE_SIZE)
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namespace Debugger
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{
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class CCPUDebug;
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/*
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* Base class for objects that reference an address, such as a label or a comment.
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*/
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class CAddressRef
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{
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protected:
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CAddressRef(CCPUDebug *refCPU, UINT32 refAddr, UINT32 refSize = 1);
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public:
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CCPUDebug *cpu;
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const UINT32 addr;
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const UINT32 size;
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const UINT32 addrEnd;
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bool CheckAddr(UINT32 loc);
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// TODO - implement operators
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};
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/*
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* Class that holds a table of address references. It does so in an a memory-expensive manner but with the result that it
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* performs better (hopefully!) as lookups are constant-time.
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*/
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class CAddressTable
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{
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private:
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int m_count;
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CAddressRef **m_tables[NUM_TABLES];
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CAddressRef **GetTableNoCreate(UINT32 addr, int &tableIndex, unsigned &indexInTable);
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CAddressRef **GetTableCreate(UINT32 addr, int &tableIndex, unsigned &indexInTable);
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void CheckAndReleaseTable(int tableIndex);
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public:
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CAddressTable();
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~CAddressTable();
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bool IsEmpty();
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void Clear();
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CAddressRef *Get(UINT32 addr);
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CAddressRef *Get(UINT32 addr, UINT32 size);
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void Add(CAddressRef *value);
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bool Remove(CAddressRef *value);
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};
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//
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// Inlined methods
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//
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inline bool CAddressRef::CheckAddr(UINT32 loc)
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{
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return addr <= loc && loc <= addrEnd;
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}
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inline CAddressRef **CAddressTable::GetTableNoCreate(UINT32 addr, int &tableIndex, unsigned &indexInTable)
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{
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tableIndex = addr >> INDEX_SHIFT;
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if (m_tables[tableIndex] == NULL)
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return NULL;
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indexInTable = addr & TABLE_MASK;
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return m_tables[tableIndex];
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}
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inline CAddressRef *CAddressTable::Get(UINT32 addr)
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{
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int tableIndex;
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unsigned indexInTable;
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CAddressRef **table = GetTableNoCreate(addr, tableIndex, indexInTable);
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if (table == NULL)
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return NULL;
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return table[indexInTable];
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}
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inline CAddressRef *CAddressTable::Get(UINT32 addr, UINT32 size)
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{
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int tableIndex;
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unsigned indexInTable;
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CAddressRef **table = GetTableNoCreate(addr, tableIndex, indexInTable);
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for (UINT32 i = 0; i < size; i++)
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{
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if (table != NULL)
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{
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CAddressRef *ref = table[indexInTable];
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if (ref != NULL)
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return ref;
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addr++;
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if (indexInTable >= TABLE_SIZE - 1)
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table = GetTableNoCreate(addr, tableIndex, indexInTable);
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else
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indexInTable++;
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}
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else
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{
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addr++;
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table = GetTableNoCreate(addr, tableIndex, indexInTable);
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}
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}
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return NULL;
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}
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}
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#endif // INCLUDED_ADDRESSTABLE_H
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#endif // SUPERMODEL_DEBUGGER
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