检测特定虚拟函数的vtable偏移量(使用Visual C ++) [英] Detect the the vtable offset of a specific virtual function (using Visual C++)
问题描述
是否可以检查特定虚拟函数的vtable偏移量?
Can the vtable offset of a specific virtual function be inspected?
为什么?我想要能够检测无意的二进制兼容性中断(请参阅 http:// techbase。 kde.org/Policies/Binary_Compatibility_Issues_With_C%2B%2B 我的意思是二进制兼容性)。
Why? I'd like to be able to detect unintentional binary compatibility breaks (see http://techbase.kde.org/Policies/Binary_Compatibility_Issues_With_C%2B%2B for what I mean by binary compatibility).
我知道/ d1reportSingleClassLayout的无文档和不支持的技术(http://blogs.msdn.com/b/vcblog/archive/2007/05 /17/diagnosing-hidden-odr-violations-in-visual-c-and-fixing-lnk2022.aspx),我打算使用这种技术,但我也想使用一些简单的编译时间或运行时检查如果可能的话。
I'm aware of the undocumented and unsupported technique of "/d1reportSingleClassLayout" (http://blogs.msdn.com/b/vcblog/archive/2007/05/17/diagnosing-hidden-odr-violations-in-visual-c-and-fixing-lnk2022.aspx), and I plan to use this technique, but I'd like to also use some simple compile time or run time checks if possible.
推荐答案
受到Jerry的回答的启发,我设法写了这个函数, :
Inspired by Jerry's answer, I managed to write up this function that can do the same thing for any function signature:
#include <iostream>
struct A
{
virtual void a() {}
virtual void b() {}
virtual void c() {}
};
template <class T>
int SeeBits(T func)
{
union
{
T ptr;
int i;
};
ptr = func;
return i;
}
int main()
{
int i = SeeBits(&A::a);
int j = SeeBits(&A::b);
int k = SeeBits(&A::c);
std::cout << i << " " << j << " " << k << std::endl;
return 0;
}
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