/// <summary>
/// 执行算术和按位运算
/// </summary>
public void Arith(EArithOp op)
{
var b = _stack.Pop();
var a = b;
if (op != EArithOp.Unm && op != EArithOp.BNot)
{
a = _stack.Pop();
}
var o = Operators.Ops[(int)op];
var ret = InnerArith(a, b, o);
if (ret != null)
{
_stack.Push(ret);
return;
}
var mm = Operators.Ops[(int)op].MetaMethod;
if (LuaValue.CallMetaMethod(a, b, mm, this, out ret))
{
_stack.Push(ret);
return;
}
Debug.Panic("arithmetic error!");
}
/// <summary>
/// R(A) = op R(B)
/// </summary>
private static void UnaryArith(Instruction ins, ILuaVM vm, EArithOp op)
{
ins.ABC(out var a, out var b, out _);
a += 1;
b += 1;
vm.PushValue(b);
vm.Arith(op);
vm.Replace(a);
}
/// <summary>
/// R(A) = RK(B) op RK(C)
/// </summary>
private static void BinaryArith(Instruction ins, ILuaVM vm, EArithOp op)
{
ins.ABC(out var a, out var b, out var c);
a += 1;
vm.GetRK(b);
vm.GetRK(c);
vm.Arith(op);
vm.Replace(a);
}