方法存储在内存中的什么位置? [英] Where are methods stored in memory?

问题描述

我了解到类字段存储在堆中，但是方法存储在哪里?在堆中还是在其他地方?它们是内联的吗?

I learned that class fields are stored in the heap, but where are methods stored? In the heap or somewhere else? are they inline?

推荐答案

方法存储在内存中的其他地方.请注意，方法是针对每个类的，而不是针对每个实例的.因此，通常情况下，方法的数量不会随着程序的运行时间而改变(也有例外).在传统模型中，方法所在的地方称为代码段".在 .net 中，这更困难:方法最初存在于程序集中，并被映射到进程内存中.在那里，即时编译器在本机代码中创建一些方法的第二个副本；这个副本被执行.JIT 代码可能会在运行时多次创建和删除，因此将其视为在堆中"也是可行的.

Methods are stored somewhere else in the memory. Notice that methods are per-class, not per-instance. So typically, the number of methods doesn't change over the run-time of a program (there are exceptions). In traditional models, the place where the methods live is called the "code segment". In .net, it's more difficult: the methods originally live in the assembly, and get mapped into the process memory. There, the just-in-time compiler creates a second copy of some methods in native code; this copy gets executed. The JIT code may get created and deleted several times during the runtime, so it is practical to view it also as living "in Heap".

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