Java中有多少字节的字节码有特定的方法？ [英] How many bytes of bytecode has a particular method in Java?

问题描述

我最近在 Jon Masamitsu的Weblog 上看到了巨大的方法（8000字节的字节码）是不是用HotSpot编译JIT。

I recently read on Jon Masamitsu's Weblog that huge methods (8000 bytes of bytecode) are not JIT compiled with HotSpot.

所以我的问题是：我如何找出（作为程序员）特定方法有多少字节的字节码？

So my question is: how do I find out (as a programmer) how many bytes of bytecode a particular method has?

JIT编译器当然似乎知道。我可以从 .class 文件中提取这条信息吗？

The JIT compiler of course seems to know. Can I extract this piece of information from the .class file?

推荐答案

您可以使用 javap -c mypackage.MyClass 转储类的字节码（并查看每种方法的大小）

You can use javap -c mypackage.MyClass to dump the bytecode of your class (and see the size of each method)

一般来说，在达到此限制之前，您应该知道方法太大而无法阅读和理解。恕我直言，它生成的代码更多的问题。 BTW方法中存在65536字节的硬限制。

Generally speaking, you should know that a method is too large to read and understand before you hit this limit. IMHO its more a problem for generated code. BTW There is a hard limit of 65536 bytes in a method.

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