如果生成的字节码指令序列的任何细节有误，那么把包含这个字节码的类装入jvm时，检验就会失败。
If any detail of a generated bytecode instruction sequence is wrong, the class containing that bytecode will fail verification when you attempt to load it into a JVM.
从本质上说，我是在实现自己的字节码即时检验器。
In essence, I was implementing my own on-the-fly validator for the bytecode.
校验位是附在字节最后的一个额外的位，其目的是为了检验其精确性。
A check bit is an extra bit attached to the end of a byte for purposes of checking for accuracy.
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