插入全局变量声明whit一个gcc插件 [英] Insert global variable declaration whit a gcc plugin

问题描述

我知道是否可以用gcc插件插入一个全局变量声明。例如，如果我有以下代码：

I would know if it's possible to insert a global variable declaration with a gcc plugin. For example if I got de following code:

test.c：

int main(void) {
  return 0;
}

，我想将其转换为：

int fake_var;

int main(void) {
  return 0;
}

这是可能吗？
如果可能，通过我怎么办？

Is that possible? If it's possible, in wich pass a how can I do it?

推荐答案

我想你会想看看varpool.c中的varpool_add_new_variable（）。你应该能够传递一个类型为VAR_DECL的声明。同样，看看add_new_static_var（），但我认为前者是你想要的，因为它是专门允许在中间/后端声明全局变量。

I think you'll want to take a look at varpool_add_new_variable() in varpool.c. You should be able to pass a declaration built with type VAR_DECL to it. Similarly, take a look at add_new_static_var(), but I think the former is what you want, as it was added specifically to allow declaring globals in the middle/back end.

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