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using ChocolArm64.State;
using System;
using System.Collections.Generic;
using System.Reflection.Emit;
using System.Runtime.Intrinsics;
namespace ChocolArm64.Translation
{
class ILMethodBuilder
{
public LocalAlloc LocalAlloc { get; private set; }
public ILGenerator Generator { get; private set; }
private Dictionary<Register, int> _locals;
private ILBlock[] _ilBlocks;
private string _subName;
private int _localsCount;
public ILMethodBuilder(ILBlock[] ilBlocks, string subName)
{
_ilBlocks = ilBlocks;
_subName = subName;
}
public TranslatedSub GetSubroutine(TranslationTier tier)
{
LocalAlloc = new LocalAlloc(_ilBlocks, _ilBlocks[0]);
DynamicMethod method = new DynamicMethod(_subName, typeof(long), TranslatedSub.FixedArgTypes);
Generator = method.GetILGenerator();
TranslatedSub subroutine = new TranslatedSub(method, tier);
_locals = new Dictionary<Register, int>();
_localsCount = 0;
new ILOpCodeLoadState(_ilBlocks[0]).Emit(this);
foreach (ILBlock ilBlock in _ilBlocks)
{
ilBlock.Emit(this);
}
subroutine.PrepareMethod();
return subroutine;
}
public int GetLocalIndex(Register reg)
{
if (!_locals.TryGetValue(reg, out int index))
{
Generator.DeclareLocal(GetFieldType(reg.Type));
index = _localsCount++;
_locals.Add(reg, index);
}
return index;
}
private static Type GetFieldType(RegisterType regType)
{
switch (regType)
{
case RegisterType.Flag: return typeof(bool);
case RegisterType.Int: return typeof(ulong);
case RegisterType.Vector: return typeof(Vector128<float>);
}
throw new ArgumentException(nameof(regType));
}
public static Register GetRegFromBit(int bit, RegisterType baseType)
{
if (bit < 32)
{
return new Register(bit, baseType);
}
else if (baseType == RegisterType.Int)
{
return new Register(bit & 0x1f, RegisterType.Flag);
}
else
{
throw new ArgumentOutOfRangeException(nameof(bit));
}
}
public static bool IsRegIndex(int index)
{
return (uint)index < 32;
}
}
}
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