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using ARMeilleure.IntermediateRepresentation;
using ARMeilleure.Memory;
using System;
using System.Runtime.InteropServices;
namespace ARMeilleure.State
{
class NativeContext : IDisposable
{
private const int IntSize = 8;
private const int VecSize = 16;
private const int FlagSize = 4;
private const int ExtraSize = 4;
private const int TotalSize = RegisterConsts.IntRegsCount * IntSize +
RegisterConsts.VecRegsCount * VecSize +
RegisterConsts.FlagsCount * FlagSize + ExtraSize;
public IntPtr BasePtr { get; }
public NativeContext()
{
BasePtr = MemoryManagement.Allocate(TotalSize);
}
public ulong GetX(int index)
{
if ((uint)index >= RegisterConsts.IntRegsCount)
{
throw new ArgumentOutOfRangeException(nameof(index));
}
return (ulong)Marshal.ReadInt64(BasePtr, index * IntSize);
}
public void SetX(int index, ulong value)
{
if ((uint)index >= RegisterConsts.IntRegsCount)
{
throw new ArgumentOutOfRangeException(nameof(index));
}
Marshal.WriteInt64(BasePtr, index * IntSize, (long)value);
}
public V128 GetV(int index)
{
if ((uint)index >= RegisterConsts.IntRegsCount)
{
throw new ArgumentOutOfRangeException(nameof(index));
}
int offset = RegisterConsts.IntRegsCount * IntSize + index * VecSize;
return new V128(
Marshal.ReadInt64(BasePtr, offset + 0),
Marshal.ReadInt64(BasePtr, offset + 8));
}
public void SetV(int index, V128 value)
{
if ((uint)index >= RegisterConsts.IntRegsCount)
{
throw new ArgumentOutOfRangeException(nameof(index));
}
int offset = RegisterConsts.IntRegsCount * IntSize + index * VecSize;
Marshal.WriteInt64(BasePtr, offset + 0, value.GetInt64(0));
Marshal.WriteInt64(BasePtr, offset + 8, value.GetInt64(1));
}
public bool GetPstateFlag(PState flag)
{
if ((uint)flag >= RegisterConsts.FlagsCount)
{
throw new ArgumentException($"Invalid flag \"{flag}\" specified.");
}
int offset =
RegisterConsts.IntRegsCount * IntSize +
RegisterConsts.VecRegsCount * VecSize + (int)flag * FlagSize;
int value = Marshal.ReadInt32(BasePtr, offset);
return value != 0;
}
public void SetPstateFlag(PState flag, bool value)
{
if ((uint)flag >= RegisterConsts.FlagsCount)
{
throw new ArgumentException($"Invalid flag \"{flag}\" specified.");
}
int offset =
RegisterConsts.IntRegsCount * IntSize +
RegisterConsts.VecRegsCount * VecSize + (int)flag * FlagSize;
Marshal.WriteInt32(BasePtr, offset, value ? 1 : 0);
}
public int GetCounter()
{
return Marshal.ReadInt32(BasePtr, GetCounterOffset());
}
public void SetCounter(int value)
{
Marshal.WriteInt32(BasePtr, GetCounterOffset(), value);
}
public static int GetRegisterOffset(Register reg)
{
int offset, size;
if (reg.Type == RegisterType.Integer)
{
offset = reg.Index * IntSize;
size = IntSize;
}
else if (reg.Type == RegisterType.Vector)
{
offset = RegisterConsts.IntRegsCount * IntSize + reg.Index * VecSize;
size = VecSize;
}
else /* if (reg.Type == RegisterType.Flag) */
{
offset = RegisterConsts.IntRegsCount * IntSize +
RegisterConsts.VecRegsCount * VecSize + reg.Index * FlagSize;
size = FlagSize;
}
if ((uint)(offset + size) > (uint)TotalSize)
{
throw new ArgumentException("Invalid register.");
}
return offset;
}
public static int GetCounterOffset()
{
return RegisterConsts.IntRegsCount * IntSize +
RegisterConsts.VecRegsCount * VecSize +
RegisterConsts.FlagsCount * FlagSize;
}
public void Dispose()
{
MemoryManagement.Free(BasePtr);
}
}
}
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