凡在.NET局部变量存储在哪里？ [英] Where are .NET local variables stored?

问题描述

在IL，您可以定义使用 .locals 指令的局部变量。凡被这些变量存储堆栈或堆？

In IL, you can define local variables using the .locals directive. Where are these variables stored, stack or heap?

推荐答案

这是JIT编译器非常多的实现细节。它会非常努力地存储局部变量在CPU寄存器，效率非常高。堆栈是通常的后备存储，万一有不可用于存储所有的局部变量足够的寄存器

It is very much an implementation detail of the JIT compiler. It will try very hard to store local variables in a CPU register, very efficient. The stack is the usual backing store, in case there aren't enough registers available to store all the local variables.

在x86和x64抖动例如相差很大。 64有很多更多的寄存器可用。这也适用于传递给方法的参数。 86允许2在CPU寄存器传递，64允许4.加任何可以存储在FPU堆栈或XMM寄存器。所以，有确实四个不同的地方局部变量可以被存储

Big difference between the x86 and x64 jitters for example. x64 has a lot more registers available. This also applies to the arguments passed to a method. x86 allows 2 passed in a CPU register, x64 allows 4. Plus whatever can be stored in the FPU stack or XMM registers. So, there are really four distinct places a local variable can be stored.

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