private static int PrepFuncCall(FuncInfo fi, FuncCallExp node, int a)
{
var nArgs = node.Args?.Count ?? 0;
var lastArgIsVarargsOrFuncCall = false;
CgExp(fi, node.PrefixExp, a, 1);
if (node.NameExp != null)
{
fi.IndexOfConstant(node.NameExp.Str, out var idx);
var c = 0x100 + idx;
fi.EmitSelf(a, a, c);
}
for (var i = 0; i < nArgs; i++)
{
var arg = node.Args[i];
var tmp = fi.AllocReg();
if (i == nArgs - 1 && IsVarargOrFuncCall(arg))
{
lastArgIsVarargsOrFuncCall = true;
CgExp(fi, arg, tmp, -1);
}
else
{
CgExp(fi, arg, tmp, 1);
}
}
fi.FreeRegs(nArgs);
if (node.NameExp != null)
{
nArgs++;
}
if (lastArgIsVarargsOrFuncCall)
{
nArgs = -1;
}
return(nArgs);
}
private static void CgTailCallExp(FuncInfo fi, FuncCallExp node, int a)
{
var nArgs = PrepFuncCall(fi, node, a);
fi.EmitTailCall(a, nArgs);
}
private static void CgFuncCallExp(FuncInfo fi, FuncCallExp node, int a, int n)
{
var nArgs = PrepFuncCall(fi, node, a);
fi.EmitCall(a, nArgs, n);
}