public (int high, int low) Run()
{
int ip = 0;
int sp = 0;
int[] stack = new int[MaxStack];
int[] locals = new int[MaxLocals];
void Push(int value) => stack[sp++] = value;
void PushLongFromInts(int high, int low)
{
Push(high); Push(low);
}
void PushLongFromLong(long value)
{
(var high, var low) = value;
Push(high);
Push(low);
}
int Pop() => stack[--sp];
(int high, int low) PopLong() => (Pop(), Pop());
while (true)
{
byte opCode = ByteCode[ip];
switch (opCode)
{
case 0x00:
break;
case 0x02:
case 0x03:
case 0x04:
case 0x05:
case 0x06:
case 0x07:
case 0x08:
Push(opCode - 0x03);
break;
case 0x1A:
case 0x1B:
case 0x1C:
case 0x1D:
Push(locals[opCode - 0x1A]);
break;
case 0x3B:
case 0x3C:
case 0x3D:
case 0x3E:
locals[opCode - 0x3B] = Pop();
break;
case 0x60:
break;
case 0xAC:
return(0, Pop());
case 0xB8:
int methodrefIndex = (ByteCode[++ip] << 8) + ByteCode[++ip];
MethodrefInfo methodref = classFile.PoolInfos[methodrefIndex] as MethodrefInfo;
MethodInfo method = null;
for (int i = 0; i < classFile.Methods.Length; i++)
{
if (classFile.Methods[i].Name == methodref.RefName)
{
method = classFile.Methods[i];
break;
}
}
//method
//method?.Frame.Run();
break;
default:
throw new NotImplementedException("Unimplemented Op Code: 0x" + ByteCode[ip].ToString("X2"));
}
ip++;
}
}
private ConstantPoolInfo[] ParseConstantPool(ref ReadOnlySpan <byte> fileData)
{
ushort poolCount = fileData.ReadTwoBytes();
var infos = new ConstantPoolInfo[poolCount];
for (int i = 1; i < poolCount; i++)
{
var tag = (ConstantPoolTag)fileData.ReadOneByte();
switch (tag)
{
case ConstantPoolTag.Class:
infos[i] = new ClassInfo(ref fileData);
break;
case ConstantPoolTag.Fieldref:
infos[i] = new FieldrefInfo(ref fileData);
break;
case ConstantPoolTag.Methodref:
infos[i] = new MethodrefInfo(ref fileData);
break;
case ConstantPoolTag.InterfaceMethodref:
infos[i] = new InterfaceMethodrefInfo(ref fileData);
break;
case ConstantPoolTag.String:
infos[i] = new StringInfo(ref fileData);
break;
case ConstantPoolTag.Integer:
infos[i] = new IntegerInfo(ref fileData);
break;
case ConstantPoolTag.Float:
infos[i] = new FloatInfo(ref fileData);
break;
case ConstantPoolTag.Long:
infos[i] = new LongInfo(ref fileData);
i++;
break;
case ConstantPoolTag.Double:
infos[i] = new DoubleInfo(ref fileData);
i++;
break;
case ConstantPoolTag.NameAndType:
infos[i] = new NameAndTypeInfo(ref fileData);
break;
case ConstantPoolTag.Utf8:
infos[i] = new Utf8Info(ref fileData);
break;
case ConstantPoolTag.MethodHandle:
fileData.ReadOneByte();
fileData.ReadTwoBytes();
break;
case ConstantPoolTag.MethodType:
fileData.ReadTwoBytes();
break;
case ConstantPoolTag.InvokeDynamic:
fileData.ReadFourBytes();
break;
default:
throw new InvalidDataException();
}
}
foreach (ConstantPoolInfo info in infos)
{
info?.Init(infos);
}
return(infos);
}
