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using System;
using System.IO;
namespace Spv.Generator
{
public class LiteralInteger : IOperand, IEquatable<LiteralInteger>
{
[ThreadStatic]
private static GeneratorPool<LiteralInteger> _pool;
internal static void RegisterPool(GeneratorPool<LiteralInteger> pool)
{
_pool = pool;
}
internal static void UnregisterPool()
{
_pool = null;
}
public OperandType Type => OperandType.Number;
private enum IntegerType
{
UInt32,
Int32,
UInt64,
Int64,
Float32,
Float64,
}
private IntegerType _integerType;
private ulong _data;
public ushort WordCount { get; private set; }
public LiteralInteger() { }
private static LiteralInteger New()
{
return _pool.Allocate();
}
private LiteralInteger Set(ulong data, IntegerType integerType, ushort wordCount)
{
_data = data;
_integerType = integerType;
WordCount = wordCount;
return this;
}
public static implicit operator LiteralInteger(int value) => New().Set((ulong)value, IntegerType.Int32, 1);
public static implicit operator LiteralInteger(uint value) => New().Set(value, IntegerType.UInt32, 1);
public static implicit operator LiteralInteger(long value) => New().Set((ulong)value, IntegerType.Int64, 2);
public static implicit operator LiteralInteger(ulong value) => New().Set(value, IntegerType.UInt64, 2);
public static implicit operator LiteralInteger(float value) => New().Set(BitConverter.SingleToUInt32Bits(value), IntegerType.Float32, 1);
public static implicit operator LiteralInteger(double value) => New().Set(BitConverter.DoubleToUInt64Bits(value), IntegerType.Float64, 2);
public static implicit operator LiteralInteger(Enum value) => New().Set((ulong)(int)(object)value, IntegerType.Int32, 1);
// NOTE: this is not in the standard, but this is some syntax sugar useful in some instructions (TypeInt ect)
public static implicit operator LiteralInteger(bool value) => New().Set(Convert.ToUInt64(value), IntegerType.Int32, 1);
public static LiteralInteger CreateForEnum<T>(T value) where T : Enum
{
return value;
}
public void WriteOperand(BinaryWriter writer)
{
if (WordCount == 1)
{
writer.Write((uint)_data);
}
else
{
writer.Write(_data);
}
}
public override bool Equals(object obj)
{
return obj is LiteralInteger literalInteger && Equals(literalInteger);
}
public bool Equals(LiteralInteger cmpObj)
{
return Type == cmpObj.Type && _integerType == cmpObj._integerType && _data == cmpObj._data;
}
public override int GetHashCode()
{
return DeterministicHashCode.Combine(Type, _data);
}
public bool Equals(IOperand obj)
{
return obj is LiteralInteger literalInteger && Equals(literalInteger);
}
public override string ToString() => $"{_integerType} {_data}";
}
}
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