前面简单介绍了Aspect C++,相信没人看出它有什么特别强大的地方。
这次特别挑了一个合适的例子,检查内存泄漏。
首先看一个普通的程序:
1、test.h
这个程序会有6个对象泄漏。如果是在很隐蔽的地方分配对象,如何能够快速查找出来呢?
采用Aspect C++,我们可以在构造函数和析构函数中插入代码,帮助检查内存泄漏。
首先实现一个内存分配记录管理器:
1、memory_recorder.h
这次特别挑了一个合适的例子,检查内存泄漏。
首先看一个普通的程序:
1、test.h
#ifndef __TEST_H__
#define __TEST_H__
class Test1
{
};
class Test2
{
};
class Test3
{
};
#endif // __TEST_H__
2、main.cc#define __TEST_H__
class Test1
{
};
class Test2
{
};
class Test3
{
};
#endif // __TEST_H__
#include "test.h"
int main ()
{
Test1 test1;
Test2 test2;
Test3 test3;
new Test1();
new Test2();
new Test2();
new Test1();
new Test1(test1);
new Test3(test3);
return 0;
}
int main ()
{
Test1 test1;
Test2 test2;
Test3 test3;
new Test1();
new Test2();
new Test2();
new Test1();
new Test1(test1);
new Test3(test3);
return 0;
}
这个程序会有6个对象泄漏。如果是在很隐蔽的地方分配对象,如何能够快速查找出来呢?
采用Aspect C++,我们可以在构造函数和析构函数中插入代码,帮助检查内存泄漏。
首先实现一个内存分配记录管理器:
1、memory_recorder.h
#ifndef __MEMORY_RECORDER_H__
#define __MEMORY_RECORDER_H__
#include <map>
#include <typeinfo>
using namespace std;
class MemoryRecorder
{
map<void*, const type_info*> objects;
public:
~MemoryRecorder ();
void addObject(void* obj, const type_info& ti);
void removeObject(void* obj, const type_info& ti);
};
extern MemoryRecorder g_memoryRecorder;
#endif // __MEMORY_RECORDER_H__
2、memory_recorder.cc#define __MEMORY_RECORDER_H__
#include <map>
#include <typeinfo>
using namespace std;
class MemoryRecorder
{
map<void*, const type_info*> objects;
public:
~MemoryRecorder ();
void addObject(void* obj, const type_info& ti);
void removeObject(void* obj, const type_info& ti);
};
extern MemoryRecorder g_memoryRecorder;
#endif // __MEMORY_RECORDER_H__
#include "memory_recorder.h"
#include <iostream>
using namespace std;
MemoryRecorder g_memoryRecorder;
MemoryRecorder::~MemoryRecorder ()
{
if (objects.size() > 0)
{
cout << objects.size() << " objects not released:" << endl;
for (map<void*, const type_info*>::const_iterator iter = objects.begin();
iter != objects.end();
iter ++)
{
cout << "/t" << iter->second->name() << ": " << (iter->first) << endl;
delete (iter->first);
}
}
}
void MemoryRecorder::addObject(void* obj, const type_info& ti)
{
objects.insert(make_pair(obj, &ti));
}
void MemoryRecorder::removeObject(void* obj, const type_info& ti)
{
objects.erase(obj);
}
3、实现方面,test.ah#include <iostream>
using namespace std;
MemoryRecorder g_memoryRecorder;
MemoryRecorder::~MemoryRecorder ()
{
if (objects.size() > 0)
{
cout << objects.size() << " objects not released:" << endl;
for (map<void*, const type_info*>::const_iterator iter = objects.begin();
iter != objects.end();
iter ++)
{
cout << "/t" << iter->second->name() << ": " << (iter->first) << endl;
delete (iter->first);
}
}
}
void MemoryRecorder::addObject(void* obj, const type_info& ti)
{
objects.insert(make_pair(obj, &ti));
}
void MemoryRecorder::removeObject(void* obj, const type_info& ti)
{
objects.erase(obj);
}
#ifndef __TEST_AH__
#define __TEST_AH__
#include "memory_recorder.h"
#include <iostream>
using namespace std;
aspect MemberRecorder
{
pointcut all_class() = classes("Test%");
advice construction (all_class()) : after ()
{
g_memoryRecorder.addObject (tjp->target(), typeid(*tjp->target()));
}
advice destruction (all_class()) : after ()
{
g_memoryRecorder.removeObject (tjp->target(), typeid(*tjp->target()));
}
};
#endif // __TEST_AH__
#define __TEST_AH__
#include "memory_recorder.h"
aspect MemberRecorder
{
pointcut all_class() = classes("Test%");
advice construction (all_class()) : after ()
{
g_memoryRecorder.addObject (tjp->target(), typeid(*tjp->target()));
}
advice destruction (all_class()) : after ()
{
g_memoryRecorder.removeObject (tjp->target(), typeid(*tjp->target()));
}
};
#endif // __TEST_AH__