/// <summary>
/// R(A) -= R(A + 2)
/// pc += sBx
/// </summary>
public static void ForPrep(Instruction ins, ILuaVM vm)
{
ins.AsBx(out var a, out var sbx);
a += 1;
if (vm.Type(a) == ELuaType.String)
{
vm.PushNumber(vm.ToNumber(a));
vm.Replace(a);
}
if (vm.Type(a + 1) == ELuaType.String)
{
vm.PushNumber(vm.ToNumber(a + 1));
vm.Replace(a + 1);
}
if (vm.Type(a + 2) == ELuaType.String)
{
vm.PushNumber(vm.ToNumber(a + 2));
vm.Replace(a + 2);
}
// R(A) -= R(A + 2)
vm.PushValue(a);
vm.PushValue(a + 2);
vm.Arith(EArithOp.Sub);
vm.Replace(a);
// pc += sBx
vm.AddPC(sbx);
}
internal static void ForPrep(Instruction i, ILuaVM vm)
{
var(a, sBx) = i.AsBx();
a += 1;
// R(A)-=R(A+2)
vm.PushValue(a);
vm.PushValue(a + 2);
vm.Arith(ArithOp.Sub);
vm.Replace(a);
// pc += sBx
vm.AddPC(sBx);
}
private static void unaryArith(int i, ILuaVM vm, ArithOpEnum op)
{
int a = Instruction.GetA(i) + 1;
int b = Instruction.GetB(i) + 1;
vm.PushValue(b);
vm.Arith(op);
vm.Replace(a);
}
public static void SetList(Instruction i, ILuaVM vm)
{
const int FIELDS_PER_FLUSH = 50;
var(a, b, c) = i.ABC();
a += 1;
bool bIsZero = b == 0;
if (bIsZero)
{
b = (int)vm.ToInteger(-1) - a - 1;
vm.Pop(1);
}
if (c > 0)
{
c -= 1;
}
else
{
c = ((Instruction)vm.Fetch()).Ax();
}
Int64 idx = (Int64)(c * FIELDS_PER_FLUSH);
for (int j = 1; j <= b; j++)
{
idx++;
vm.PushValue(a + j);
vm.SetI(a, idx);
}
if (bIsZero)
{
for (int j = vm.RegisterCount() + 1; j <= vm.GetTop(); j++)
{
idx++;
vm.PushValue(j);
vm.SetI(a, idx);
}
vm.SetTop(vm.RegisterCount());
}
}
/// <summary>
/// R(A)[(C - 1) * FPF + i] := R(A + i), 1 <= i <= B
/// </summary>
public static void SetList(Instruction ins, ILuaVM vm)
{
ins.ABC(out var a, out var b, out var c);
a += 1;
if (c > 0)
{
c--;
}
else
{
new Instruction(vm.Fetch()).Ax(out c);
}
var bIsZero = b == 0;
if (bIsZero)
{
b = (int)vm.ToInteger(-1) - a - 1;
vm.Pop(1);
}
vm.CheckStack(1);
var idx = (LuaInt)(c * LFIELDS_PER_FLUSH);
for (var j = 1; j <= b; j++)
{
idx++;
vm.PushValue(a + j);
vm.SetI(a, idx);
}
if (bIsZero)
{
for (var j = vm.RegisterCount() + 1; j <= vm.GetTop(); j++)
{
idx++;
vm.PushValue(j);
vm.SetI(a, idx);
}
vm.SetTop(vm.RegisterCount());
}
}
private static void UnaryArith(Instruction i, ILuaVM vm, ArithOp op)
{
var(a, b, _) = i.ABC();
a += 1;
b += 1;
vm.PushValue(b);
vm.Arith(op);
vm.Replace(a);
}
/// <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);
}
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)
}
}
private static void FixStack(int a, ILuaVM vm)
{
var x = (int)vm.ToInteger(-1);
vm.Pop(1);
vm.CheckStack(x - a);
for (var i = a; i < x; i++)
{
vm.PushValue(i);
}
vm.Rotate(vm.RegisterCount() + 1, x - 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);
}
}
private static int PushFuncAndArgs(int a, int b, ILuaVM vm)
{
if (b >= 1)
{
vm.CheckStack(b);
for (int i = a; i < a + b; i++)
{
vm.PushValue(i);
}
return(b - 1);
}
else
{
FixStack(a, vm);
return(vm.GetTop() - vm.RegisterCount() - 1);
}
}
internal static void Concat(Instruction i, ILuaVM vm)
{
var(a, b, c) = i.ABC();
a += 1;
b += 1;
c += 1;
int n = c - b + 1;
vm.CheckStack(n);
for (int j = b; j <= c; j++)
{
vm.PushValue(j);
}
vm.Concat(n);
vm.Replace(a);
}
//R(A)[(C - 1)*FPF+i] := R(A + i)
public static void SetList(int i, ILuaVM vm)
{
int a = Instruction.GetA(i) + 1;
int b = Instruction.GetB(i);
int c = Instruction.GetC(i);
c = c > 0 ? c - 1 : Instruction.GetAx(vm.Fetch());
vm.CheckStack(1);
int idx = c * LFIELDS_PER_FLUSH;
for (int j = 1; j <= b; j++)
{
idx++;
vm.PushValue(a + j);
vm.SetI(a, idx);
}
}
/// <summary>
/// return R(A), ..., R(A + B - 2)
/// </summary>
public static void Return(Instruction ins, ILuaVM vm)
{
ins.ABC(out var a, out var b, out _);
a += 1;
if (b == 1)
{
}
else if (b > 1)
{
vm.CheckStack(b - 1);
for (var i = a; i <= a + b - 2; i++)
{
vm.PushValue(i);
}
}
else
{
FixStack(a, vm);
}
}
public static void Return(Instruction i, ILuaVM vm)
{
var(a, b, _) = i.ABC();
a += 1;
if (b == 1)
{
}
else if (b > 1)
{
vm.CheckStack(b - 1);
for (int j = a; j <= a + b - 2; j++)
{
vm.PushValue(j);
}
}
else
{
FixStack(a, vm);
}
}
//(iABC) return R(A), R(A + 1), ......, + R(A + B - 2)
public static void Return(int i, ILuaVM vm)
{
int a = Instruction.GetA(i) + 1;
int b = Instruction.GetB(i);
if (b == 1)
{
}
else if (b > 1)
{
vm.CheckStack(b - 1);
for (int j = a; j <= a + b - 2; j++)
{
vm.PushValue(j);
}
}
else
{
fixStack(a, vm);
}
}