You might wonder why I check whether the method is static at the start of my parameter size calculation, then initialize the stack frame slot to zero if it is (as opposed to one if it is not).
您可能会奇怪为什么在开始参数大小计算时要检查方法是否是静态的，如果是静态的，将堆栈帧槽初始化为零(不是静态正好相反)。
The check of the calling stack stops when it encounters a PrivilegedAction instance, effectively granting all subsequent class calls the required permission to perform the specified operation.
调用栈的检查在遇到PrivilegedAction实例时停止，有效地将执行指定操作所必需的许可权授予所有的后继类调用。
Case II: Only the server-side call stack ProtectionDomains that have been associated with the user identity should be used for the permission check.
第i i种情况：应当只用与用户身份相关联的服务器端调用堆栈protectiondomain进行权限检查。
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