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jinx/ChocolArm64/Translation/ILOpCodeConst.cs

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using System.Reflection.Emit;
using System.Runtime.InteropServices;
namespace ChocolArm64.Translation
{
class ILOpCodeConst : IILEmit
{
[StructLayout(LayoutKind.Explicit, Size = 8)]
private struct ImmVal
{
[FieldOffset(0)] public int I4;
[FieldOffset(0)] public long I8;
[FieldOffset(0)] public float R4;
[FieldOffset(0)] public double R8;
}
private ImmVal _value;
private enum ConstType
{
Int32,
Int64,
Single,
Double
}
private ConstType _type;
private ILOpCodeConst(ConstType type)
{
_type = type;
}
public ILOpCodeConst(int value) : this(ConstType.Int32)
{
_value = new ImmVal { I4 = value };
}
public ILOpCodeConst(long value) : this(ConstType.Int64)
{
_value = new ImmVal { I8 = value };
}
public ILOpCodeConst(float value) : this(ConstType.Single)
{
_value = new ImmVal { R4 = value };
}
public ILOpCodeConst(double value) : this(ConstType.Double)
{
_value = new ImmVal { R8 = value };
}
public void Emit(ILMethodBuilder context)
{
switch (_type)
{
case ConstType.Int32: context.Generator.EmitLdc_I4(_value.I4); break;
case ConstType.Int64: context.Generator.Emit(OpCodes.Ldc_I8, _value.I8); break;
case ConstType.Single: context.Generator.Emit(OpCodes.Ldc_R4, _value.R4); break;
case ConstType.Double: context.Generator.Emit(OpCodes.Ldc_R8, _value.R8); break;
}
}
}
}