/// <summary>
/// Equivalent to luaK_nil. </summary>
internal void kNil(int from, int n)
{
int previous;
if (pc > lasttarget) // no jumps to current position?
{
if (pc == 0) // function start?
{
return; // positions are already clean
}
previous = pc - 1;
int instr = f.code_Renamed[previous];
if (Lua.OPCODE(instr) == Lua.OP_LOADNIL)
{
int pfrom = Lua.ARGA(instr);
int pto = Lua.ARGB(instr);
if (pfrom <= from && from <= pto + 1) // can connect both?
{
if (from + n - 1 > pto)
{
f.code_Renamed[previous] = Lua.SETARG_B(instr, from + n - 1);
}
return;
}
}
}
kCodeABC(Lua.OP_LOADNIL, from, from + n - 1, 0);
}
private int jumponcond(Expdesc e, bool cond)
{
if (e.k == Expdesc.VRELOCABLE)
{
int ie = getcode(e);
if (Lua.OPCODE(ie) == Lua.OP_NOT)
{
pc--; // remove previous OP_NOT
return(condjump(Lua.OP_TEST, Lua.ARGB(ie), 0, cond ? 0 : 1));
}
/* else go through */
}
discharge2anyreg(e);
freeexp(e);
return(condjump(Lua.OP_TESTSET, Lua.NO_REG, e.info_Renamed, cond ? 1 : 0));
}
private bool patchtestreg(int node, int reg)
{
int i = getjumpcontrol(node);
int[] code = f.code_Renamed;
int instr = code[i];
if (Lua.OPCODE(instr) != Lua.OP_TESTSET)
{
return(false); // cannot patch other instructions
}
if (reg != Lua.NO_REG && reg != Lua.ARGB(instr))
{
code[i] = Lua.SETARG_A(instr, reg);
}
else // no register to put value or register already has the value
{
code[i] = Lua.CREATE_ABC(Lua.OP_TEST, Lua.ARGB(instr), 0, Lua.ARGC(instr));
}
return(true);
}