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using ARMeilleure.IntermediateRepresentation;
using ARMeilleure.Memory;
using System;
using System.Runtime.CompilerServices;
namespace ARMeilleure.State
{
class NativeContext : IDisposable
{
private unsafe struct NativeCtxStorage
{
public fixed ulong X[RegisterConsts.IntRegsCount];
public fixed ulong V[RegisterConsts.VecRegsCount * 2];
public fixed uint Flags[RegisterConsts.FlagsCount];
public fixed uint FpFlags[RegisterConsts.FpFlagsCount];
public int Counter;
public ulong DispatchAddress;
public ulong ExclusiveAddress;
public ulong ExclusiveValueLow;
public ulong ExclusiveValueHigh;
public int Running;
}
private static NativeCtxStorage _dummyStorage = new NativeCtxStorage();
private readonly IJitMemoryBlock _block;
public IntPtr BasePtr => _block.Pointer;
public NativeContext(IJitMemoryAllocator allocator)
{
_block = allocator.Allocate((ulong)Unsafe.SizeOf<NativeCtxStorage>());
GetStorage().ExclusiveAddress = ulong.MaxValue;
}
public unsafe ulong GetX(int index)
{
if ((uint)index >= RegisterConsts.IntRegsCount)
{
throw new ArgumentOutOfRangeException(nameof(index));
}
return GetStorage().X[index];
}
public unsafe void SetX(int index, ulong value)
{
if ((uint)index >= RegisterConsts.IntRegsCount)
{
throw new ArgumentOutOfRangeException(nameof(index));
}
GetStorage().X[index] = value;
}
public unsafe V128 GetV(int index)
{
if ((uint)index >= RegisterConsts.VecRegsCount)
{
throw new ArgumentOutOfRangeException(nameof(index));
}
return new V128(GetStorage().V[index * 2 + 0], GetStorage().V[index * 2 + 1]);
}
public unsafe void SetV(int index, V128 value)
{
if ((uint)index >= RegisterConsts.VecRegsCount)
{
throw new ArgumentOutOfRangeException(nameof(index));
}
GetStorage().V[index * 2 + 0] = value.Extract<ulong>(0);
GetStorage().V[index * 2 + 1] = value.Extract<ulong>(1);
}
public unsafe bool GetPstateFlag(PState flag)
{
if ((uint)flag >= RegisterConsts.FlagsCount)
{
throw new ArgumentException($"Invalid flag \"{flag}\" specified.");
}
return GetStorage().Flags[(int)flag] != 0;
}
public unsafe void SetPstateFlag(PState flag, bool value)
{
if ((uint)flag >= RegisterConsts.FlagsCount)
{
throw new ArgumentException($"Invalid flag \"{flag}\" specified.");
}
GetStorage().Flags[(int)flag] = value ? 1u : 0u;
}
public unsafe bool GetFPStateFlag(FPState flag)
{
if ((uint)flag >= RegisterConsts.FpFlagsCount)
{
throw new ArgumentException($"Invalid flag \"{flag}\" specified.");
}
return GetStorage().FpFlags[(int)flag] != 0;
}
public unsafe void SetFPStateFlag(FPState flag, bool value)
{
if ((uint)flag >= RegisterConsts.FpFlagsCount)
{
throw new ArgumentException($"Invalid flag \"{flag}\" specified.");
}
GetStorage().FpFlags[(int)flag] = value ? 1u : 0u;
}
public int GetCounter() => GetStorage().Counter;
public void SetCounter(int value) => GetStorage().Counter = value;
public bool GetRunning() => GetStorage().Running != 0;
public void SetRunning(bool value) => GetStorage().Running = value ? 1 : 0;
public unsafe static int GetRegisterOffset(Register reg)
{
if (reg.Type == RegisterType.Integer)
{
if ((uint)reg.Index >= RegisterConsts.IntRegsCount)
{
throw new ArgumentException("Invalid register.");
}
return StorageOffset(ref _dummyStorage, ref _dummyStorage.X[reg.Index]);
}
else if (reg.Type == RegisterType.Vector)
{
if ((uint)reg.Index >= RegisterConsts.VecRegsCount)
{
throw new ArgumentException("Invalid register.");
}
return StorageOffset(ref _dummyStorage, ref _dummyStorage.V[reg.Index * 2]);
}
else if (reg.Type == RegisterType.Flag)
{
if ((uint)reg.Index >= RegisterConsts.FlagsCount)
{
throw new ArgumentException("Invalid register.");
}
return StorageOffset(ref _dummyStorage, ref _dummyStorage.Flags[reg.Index]);
}
else /* if (reg.Type == RegisterType.FpFlag) */
{
if ((uint)reg.Index >= RegisterConsts.FpFlagsCount)
{
throw new ArgumentException("Invalid register.");
}
return StorageOffset(ref _dummyStorage, ref _dummyStorage.FpFlags[reg.Index]);
}
}
public static int GetCounterOffset()
{
return StorageOffset(ref _dummyStorage, ref _dummyStorage.Counter);
}
public static int GetDispatchAddressOffset()
{
return StorageOffset(ref _dummyStorage, ref _dummyStorage.DispatchAddress);
}
public static int GetExclusiveAddressOffset()
{
return StorageOffset(ref _dummyStorage, ref _dummyStorage.ExclusiveAddress);
}
public static int GetExclusiveValueOffset()
{
return StorageOffset(ref _dummyStorage, ref _dummyStorage.ExclusiveValueLow);
}
public static int GetRunningOffset()
{
return StorageOffset(ref _dummyStorage, ref _dummyStorage.Running);
}
private static int StorageOffset<T>(ref NativeCtxStorage storage, ref T target)
{
return (int)Unsafe.ByteOffset(ref Unsafe.As<NativeCtxStorage, T>(ref storage), ref target);
}
private unsafe ref NativeCtxStorage GetStorage() => ref Unsafe.AsRef<NativeCtxStorage>((void*)_block.Pointer);
public void Dispose() => _block.Dispose();
}
}
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