/// <summary>
/// 将函数参数压栈,准备调用函数
/// </summary>
/// <param name="parameter"></param>
internal void PushFuncParameter(ScriptObject parameter)
{
Contract.Assert(parameter != null);
int funcIndex = _funcPushStack.Peek();
FuncPart func = stack[funcIndex].Value.RefPartHandle.ConverToFuncPart();
//当前栈中的函数参数小于函数参数大小
if (Top - (funcIndex + 1) < func.ArgsCount)
{
Push(parameter);
}
else if (func.IsUncertainParameters == true) //是不定参数
{
if (Top - (funcIndex + 1) == func.ArgsCount)
{
ScriptObject s = ScriptObject.CreateTable();
stack.Add(s);
}
ScriptObject args = stack[Top - 1];
args.AddInArray(parameter);
}
//否则,则省略掉传入参数
}
/// <summary>
/// 调用指定位置的函数
/// </summary>
private ScriptObject InvokeFuncAtIndex(int at)
{
Contract.Assert(stack[at].Type == ValueType.FUNCTION);
FuncPart invokeFunc = stack[at].Value.RefPartHandle.ConverToFuncPart();
//如果函数的参数大于压入的参数,则不足部分补Nil
while (invokeFunc.ArgsCount > Top - (at + 1))
{
Push(RunEnvironment.Nil);
}
_contextStartStack.Push(contextStart);
contextStart = at; //设置当前上下文,很重要
invokeFunc.Value(); //委托调用
stack.RemoveRange(at, Top - at);
contextStart = _contextStartStack.Pop(); //恢复当前上下文
Instructor.AssignVar(This, RunEnvironment.Nil); // this 指针清空
return(returnValue);
}
/// <summary>
/// 设置每一个UpValue
/// </summary>
public static void SetUpvalue(ScriptObject function, int at, int stackIndex)
{
Contract.Assert(function.Type == ValueType.FUNCTION);
FuncPart func = function.Value.RefPartHandle.ConverToFuncPart();
func.UpVals[at] = RunEnvironment.Instance.LocalStack.GetVarFromBase(stackIndex);
}
/// <summary>
/// 设置Upvalues的长度
/// </summary>
public static void SetUpvaluesLength(ScriptObject function, int length)
{
Contract.Assert(function.Type == ValueType.FUNCTION);
FuncPart func = function.Value.RefPartHandle.ConverToFuncPart();
func.UpVals = new ScriptObject[length];
}