Cocos2dx 内存机制
CCDirector
主循环 每次清理内存池
void DisplayLinkDirector::mainLoop()
{
if (_purgeDirectorInNextLoop)
{
_purgeDirectorInNextLoop = false;
purgeDirector();
}
else if (! _invalid)
{
drawScene();
// release the objects
PoolManager::getInstance()->getCurrentPool()->clear();
}
}
CCNode
继承自ccref，每次创建都会讲当前node加入自动回收池
Node * Node::create()
{
Node * ret = new (std::nothrow) Node();
if (ret && ret->init())
{
ret->autorelease();
}
else
{
CC_SAFE_DELETE(ret);
}
return ret;
}
当每一个节点从渲染树销毁的时候都会调动~node（）方法，将单签node从内存池中清理掉
Node::~Node()
{
CCLOGINFO( "deallocing Node: %p - tag: %i",this,_tag );
#if CC_ENABLE_SCRIPT_BINDING
if (_updateScriptHandler)
{
ScriptEngineManager::getInstance()->getScriptEngine()->removeScriptHandler(_updateScriptHandler);
}
#endif
// User object has to be released before others,since userObject may have a weak reference of this node
// It may invoke `node->stopAllAction();` while `_actionManager` is null if the next line is after `CC_SAFE_RELEASE_NULL(_actionManager)`.
CC_SAFE_RELEASE_NULL(_userObject);
// attributes
CC_SAFE_RELEASE_NULL(_glProgramState);
for (auto& child : _children)
{
child->_parent = nullptr;
}
removeAllComponents();
CC_SAFE_DELETE(_componentContainer);
#if CC_USE_PHYSICS
setPhysicsBody(nullptr);
#endif
CC_SAFE_RELEASE_NULL(_actionManager);
CC_SAFE_RELEASE_NULL(_scheduler);
_eventDispatcher->removeEventListenersForTarget(this);
#if CC_NODE_DEBUG_VERIFY_EVENT_LISTENERS && COCOS2D_DEBUG > 0
_eventDispatcher->debugCheckNodeHasNoEventListenersOnDestruction(this);
#endif
CCASSERT(!_running,"Node still marked as running on node destruction! Was base class onExit() called in derived class onExit() implementations?");
CC_SAFE_RELEASE(_eventDispatcher);
}
清空内存池
void AutoreleasePool::clear()
{
#if defined(COCOS2D_DEBUG) && (COCOS2D_DEBUG > 0)
_isClearing = true;
#endif
for (const auto &obj : _managedObjectArray)
{
obj->release();
}
_managedObjectArray.clear();
#if defined(COCOS2D_DEBUG) && (COCOS2D_DEBUG > 0)
_isClearing = false;
#endif
}
CCRef
将当前对象加入内存池中
Ref* Ref::autorelease()
{
PoolManager::getInstance()->getCurrentPool()->addObject(this);
return this;
}
加入内存池具体的操作
CCAutoReleasePool
void AutoreleasePool::addObject(Ref* object)
{
_managedObjectArray.push_back(object);
}
void AutoreleasePool::clear()
{
#if defined(COCOS2D_DEBUG) && (COCOS2D_DEBUG > 0)
_isClearing = true;
#endif
std::vector<Ref*> releasings;
releasings.swap(_managedObjectArray);
for (const auto &obj : releasings)
{
obj->release();
}
#if defined(COCOS2D_DEBUG) && (COCOS2D_DEBUG > 0)
_isClearing = false;
#endif
}
{
#if defined(COCOS2D_DEBUG) && (COCOS2D_DEBUG > 0)
_isClearing = true;
#endif
std::vector<Ref*> releasings;
releasings.swap(_managedObjectArray);
for (const auto &obj : releasings)
{
obj->release();
}
#if defined(COCOS2D_DEBUG) && (COCOS2D_DEBUG > 0)
_isClearing = false;
#endif
}
//回到CCDirector中进行垃圾回收
// release the objects
PoolManager::getInstance()->getCurrentPool()->clear();
