使用gcc插件修改变量声明的顺序 [英] Use gcc plugins to modify the order of variable declarations

问题描述

我知道这很难做，我应该避免，但我有我的理由。
我想在编译时修改一些字段声明的顺序，例如：

I know this is very hard to do, and that I should avoid that, but I have my reasons for this. I want to modify the order of some field declarations in compilation time, for example :

class A {
  char c;
  int i;
}

必须转到：

class A {
      int i;
      char c;
}

如果我选择交换 i 和 c ，
我想知道如何改变位置字段声明其树

任何人都知道如何做到这一点？
感谢！

Anyone know how can I do this ?? thanks !

我使用g ++ 4.9.2版本的插件

I use the g++ 4.9.2 version of plugins

推荐答案

如果我要尝试这个，我会尝试两种不同的方法。

If I was going to try this, I would try two different approaches.

1. PLUGIN_FINISH_TYPE 事件并重写其中的类型。要重写它，重新排序字段并强制类型的重新布局。

1. Hook in to the PLUGIN_FINISH_TYPE event and rewrite the type there. To rewrite it, reorder the fields and force a relayout of the type. You'll have to read a bit of GCC source to understand how to invalidate the layout and force a new one.

如果这不起作用，请添加一个GCC源代码，一个新的pass，它只是在gimplification之后运行，并尝试重写那里的类型。我怀疑这不太可能工作。

If that didn't work, add a new pass that is run just after gimplification, and try to rewrite the types there. I suspect this is not likely to work, though.

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