/// <summary>
/// UpValue[B] = R(A)
/// </summary>
public static void SetUpval(Instruction ins, ILuaVM vm)
{
ins.ABC(out var a, out var b, out _);
a += 1;
b += 1;
vm.Copy(a, vm.LuaUpvalueIndex(b));
}
public static void Move(int i, ILuaVM vm)
{
int a = Instruction.GetA(i) + 1;
int b = Instruction.GetB(i) + 1;
vm.Copy(b, a);
}
/// <summary>
/// R(A) = R(B)
/// </summary>
public static void Move(Instruction ins, ILuaVM vm)
{
ins.ABC(out var a, out var b, out _);
a += 1;
b += 1;
vm.Copy(b, a);
}
internal static void GetUpval(Instruction i, ILuaVM vm)
{
var(a, b, _) = i.ABC();
a += 1;
b += 1;
vm.Copy(LuaState.LuaUpvalueIndex(b), a);
}
/// <summary>
/// if R(A + 1) != null
/// R(A) = R(A + 1); pc += sBx
/// </summary>
public static void TForLoop(Instruction ins, ILuaVM vm)
{
ins.AsBx(out var a, out var sbx);
a += 1;
if (!vm.IsNil(a + 1))
{
vm.Copy(a + 1, a);
vm.AddPC(sbx);
}
}
/// <summary>
/// R(A + 1) = R(B)
/// R(A) = R(B)[RK(C)]
/// </summary>
public static void Self(Instruction ins, ILuaVM vm)
{
ins.ABC(out var a, out var b, out var c);
a += 1;
b += 1;
vm.Copy(b, a + 1);
vm.GetRK(c);
vm.GetTable(b);
vm.Replace(a);
}
internal static void TForLoop(Instruction i, ILuaVM vm)
{
var(a, sBx) = i.AsBx();
a += 1;
if (!vm.IsNil(a + 1))
{
vm.Copy(a + 1, a);
vm.AddPC(sBx);
}
}
internal static void Self(Instruction i, ILuaVM vm)
{
var(a, b, c) = i.ABC();
a += 1;
b += 1;
vm.Copy(b, a + 1);
vm.GetRK(c);
vm.GetTable(b);
vm.Replace(a);
}
//R(A + 1) ：= R(B); R(A) := R(B)[RK(C)]
public static void Self(int i, ILuaVM vm)
{
int a = Instruction.GetA(i) + 1;
int b = Instruction.GetB(i) + 1;
int c = Instruction.GetC(i);
vm.Copy(b, a + 1);
vm.GetRK(c);
vm.GetTable(b);
vm.Replace(a);
}
/// <summary>
/// R(A), R(A + 1), ..., R(A + B) = nil
/// </summary>
public static void LoadNil(Instruction ins, ILuaVM vm)
{
ins.ABC(out var a, out var b, out _);
a += 1;
vm.PushNil();
for (var j = a; j <= a + b; j++)
{
vm.Copy(-1, j);
}
vm.Pop(1);
}
internal static void LoadNil(Instruction i, ILuaVM vm)
{
var(a, b, _) = i.ABC();
a += 1;
vm.PushNil();
for (int j = a; j <= a + b; j++)
{
vm.Copy(-1, j);
}
vm.Pop(1);
}
public static void LoadNil(int i, ILuaVM vm)
{
int a = Instruction.GetA(i) + 1;
int b = Instruction.GetB(i);
vm.PushNil();
for (int j = a; j <= a + b; j++)
{
vm.Copy(-1, j);
}
vm.Pop(1);
}
internal static void TestSet(Instruction i, ILuaVM vm)
{
var(a, b, c) = i.ABC();
a += 1;
b += 1;
if (vm.ToBoolean(b) == (c != 0))
{
vm.Copy(b, a);
}
else
{
vm.AddPC(1);
}
}
internal static void ForLoop(Instruction i, ILuaVM vm)
{
var(a, sBx) = i.AsBx();
a += 1;
// R(A)+=R(A+2)
vm.PushValue(a + 2);
vm.PushValue(a);
vm.Arith(ArithOp.Add);
vm.Replace(a);
// R(A)<?=R(A+1)
bool isPositiveStep = vm.ToNumber(a + 2) >= 0;
if ((isPositiveStep && vm.Compare(a, a + 1, CompareOp.Le)) ||
(!isPositiveStep && vm.Compare(a + 1, a, CompareOp.Le)))
{
vm.AddPC(sBx); // pc+=sBx
vm.Copy(a, a + 3); // R(A+3)=R(A)
}
}
/// <summary>
/// R(A) += R(A + 2)
/// if R(A) <?= R(A + 1) {
/// pc += sBx
/// R(A + 3) = R(A)
/// }
/// </summary>
public static void ForLoop(Instruction ins, ILuaVM vm)
{
ins.AsBx(out var a, out var sbx);
a += 1;
// R(A) += R(A + 2)
vm.PushValue(a + 2);
vm.PushValue(a);
vm.Arith(EArithOp.Add);
vm.Replace(a);
var isPositiveStep = vm.ToNumber(a + 2) >= 0;
if (isPositiveStep && vm.Compare(a, a + 1, ECompOp.Le) ||
!isPositiveStep && vm.Compare(a + 1, a, ECompOp.Le))
{
// pc += sBx
vm.AddPC(sbx);
// R(A + 3) = R(A)
vm.Copy(a, a + 3);
}
}