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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Runtime.InteropServices;
namespace ARMeilleure.Translation.PTC
{
[Serializable]
class PtcJumpTable
{
private readonly List<KeyValuePair<long, DirectHostAddress>> _jumpTable;
private readonly List<KeyValuePair<long, IndirectHostAddress>> _dynamicTable;
private readonly List<ulong> _targets;
private readonly Dictionary<ulong, LinkedList<int>> _dependants;
public int TableEnd => _jumpTable.Count;
public int DynTableEnd => _dynamicTable.Count;
public List<ulong> Targets => _targets;
public Dictionary<ulong, LinkedList<int>> Dependants => _dependants;
public PtcJumpTable()
{
_jumpTable = new List<KeyValuePair<long, DirectHostAddress>>();
_dynamicTable = new List<KeyValuePair<long, IndirectHostAddress>>();
_targets = new List<ulong>();
_dependants = new Dictionary<ulong, LinkedList<int>>();
}
public void Initialize(JumpTable jumpTable)
{
_targets.Clear();
foreach (ulong guestAddress in jumpTable.Targets.Keys)
{
_targets.Add(guestAddress);
}
_dependants.Clear();
foreach (var item in jumpTable.Dependants)
{
_dependants.Add(item.Key, new LinkedList<int>(item.Value));
}
}
public void Clear()
{
_jumpTable.Clear();
_dynamicTable.Clear();
_targets.Clear();
_dependants.Clear();
}
public void WriteJumpTable(JumpTable jumpTable, ConcurrentDictionary<ulong, TranslatedFunction> funcs)
{
jumpTable.ExpandIfNeededJumpTable(TableEnd);
int entry = 0;
foreach (var item in _jumpTable)
{
entry += 1;
long guestAddress = item.Key;
DirectHostAddress directHostAddress = item.Value;
long hostAddress;
if (directHostAddress == DirectHostAddress.CallStub)
{
hostAddress = DirectCallStubs.DirectCallStub(false).ToInt64();
}
else if (directHostAddress == DirectHostAddress.TailCallStub)
{
hostAddress = DirectCallStubs.DirectCallStub(true).ToInt64();
}
else if (directHostAddress == DirectHostAddress.Host)
{
if (funcs.TryGetValue((ulong)guestAddress, out TranslatedFunction func))
{
hostAddress = func.FuncPtr.ToInt64();
}
else
{
throw new KeyNotFoundException($"({nameof(guestAddress)} = 0x{(ulong)guestAddress:X16})");
}
}
else
{
throw new InvalidOperationException(nameof(directHostAddress));
}
IntPtr addr = jumpTable.GetEntryAddressJumpTable(entry);
Marshal.WriteInt64(addr, 0, guestAddress);
Marshal.WriteInt64(addr, 8, hostAddress);
}
}
public void WriteDynamicTable(JumpTable jumpTable)
{
if (JumpTable.DynamicTableElems > 1)
{
throw new NotSupportedException();
}
jumpTable.ExpandIfNeededDynamicTable(DynTableEnd);
int entry = 0;
foreach (var item in _dynamicTable)
{
entry += 1;
long guestAddress = item.Key;
IndirectHostAddress indirectHostAddress = item.Value;
long hostAddress;
if (indirectHostAddress == IndirectHostAddress.CallStub)
{
hostAddress = DirectCallStubs.IndirectCallStub(false).ToInt64();
}
else if (indirectHostAddress == IndirectHostAddress.TailCallStub)
{
hostAddress = DirectCallStubs.IndirectCallStub(true).ToInt64();
}
else
{
throw new InvalidOperationException(nameof(indirectHostAddress));
}
IntPtr addr = jumpTable.GetEntryAddressDynamicTable(entry);
Marshal.WriteInt64(addr, 0, guestAddress);
Marshal.WriteInt64(addr, 8, hostAddress);
}
}
public void ReadJumpTable(JumpTable jumpTable)
{
_jumpTable.Clear();
for (int entry = 1; entry <= jumpTable.TableEnd; entry++)
{
IntPtr addr = jumpTable.GetEntryAddressJumpTable(entry);
long guestAddress = Marshal.ReadInt64(addr, 0);
long hostAddress = Marshal.ReadInt64(addr, 8);
DirectHostAddress directHostAddress;
if (hostAddress == DirectCallStubs.DirectCallStub(false).ToInt64())
{
directHostAddress = DirectHostAddress.CallStub;
}
else if (hostAddress == DirectCallStubs.DirectCallStub(true).ToInt64())
{
directHostAddress = DirectHostAddress.TailCallStub;
}
else
{
directHostAddress = DirectHostAddress.Host;
}
_jumpTable.Add(new KeyValuePair<long, DirectHostAddress>(guestAddress, directHostAddress));
}
}
public void ReadDynamicTable(JumpTable jumpTable)
{
if (JumpTable.DynamicTableElems > 1)
{
throw new NotSupportedException();
}
_dynamicTable.Clear();
for (int entry = 1; entry <= jumpTable.DynTableEnd; entry++)
{
IntPtr addr = jumpTable.GetEntryAddressDynamicTable(entry);
long guestAddress = Marshal.ReadInt64(addr, 0);
long hostAddress = Marshal.ReadInt64(addr, 8);
IndirectHostAddress indirectHostAddress;
if (hostAddress == DirectCallStubs.IndirectCallStub(false).ToInt64())
{
indirectHostAddress = IndirectHostAddress.CallStub;
}
else if (hostAddress == DirectCallStubs.IndirectCallStub(true).ToInt64())
{
indirectHostAddress = IndirectHostAddress.TailCallStub;
}
else
{
throw new InvalidOperationException($"({nameof(hostAddress)} = 0x{hostAddress:X16})");
}
_dynamicTable.Add(new KeyValuePair<long, IndirectHostAddress>(guestAddress, indirectHostAddress));
}
}
private enum DirectHostAddress
{
CallStub,
TailCallStub,
Host
}
private enum IndirectHostAddress
{
CallStub,
TailCallStub
}
}
}
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