gdb定位常用方法总结

如何使用gdb确定基类指针所指的是哪一个子类对象。

https://blog.csdn.net/ddazz0621/article/details/95588244
https://www.codenong.com/8528979/

#include <cstdio>
#include <iostream>

using namespace std;

class A{
	public:
		virtual bool isUse()
		{
			cout << "A isUse" << endl;
			return true;
		}
		
		virtual ~A()
		{
			cout << "~A" << endl;
		}
};

class B:public A
{
	public:
		bool isUse()
		{
			cout << "B isUser" << endl;
			return false;
		}
};

class C:public A
{
	public:
		bool isUse()
		{
			cout << "C isUser" << endl;
			return false;
		}
};

int main()
{
	cout << "New B()" << endl;
	A* ptr = new B();
	cout << "End New B()" << endl;
	ptr->isUse();
	return 1;
}

在GDB中开启对象类型打印权限：

set print object on

然后使用ptype指令获取但却基类指针所执行的具体对象

ptype ptr
(gdb) ptype ptr
type = /* real type = B * */
class A {
  public:
    virtual bool isUse(void);
    ~A();
} *