autoreleaseNoPage(id obj)
static __attribute__((noinline)) id *autoreleaseNoPage(id obj)
{
// "No page" could mean no pool has been pushed
// or an empty placeholder pool has been pushed and has no contents yet
assert(!hotPage());
bool pushExtraBoundary = false;
if (haveEmptyPoolPlaceholder()) {
// We are pushing a second pool over the empty placeholder pool
// or pushing the first object into the empty placeholder pool.
// Before doing that, push a pool boundary on behalf of the pool
// that is currently represented by the empty placeholder.
pushExtraBoundary = true;
}
else if (obj != POOL_BOUNDARY && DebugMissingPools) {
// We are pushing an object with no pool in place,
// and no-pool debugging was requested by environment.
_objc_inform("MISSING POOLS: (%p) Object %p of class %s "
"autoreleased with no pool in place - "
"just leaking - break on "
"objc_autoreleaseNoPool() to debug",
pthread_self(), (void*)obj, object_getClassName(obj));
objc_autoreleaseNoPool(obj);
return nil;
}
else if (obj == POOL_BOUNDARY && !DebugPoolAllocation) {
// We are pushing a pool with no pool in place,
// and alloc-per-pool debugging was not requested.
// Install and return the empty pool placeholder.
return setEmptyPoolPlaceholder();
}
// We are pushing an object or a non-placeholder'd pool.
// Install the first page.
AutoreleasePoolPage *page = new AutoreleasePoolPage(nil);
setHotPage(page);
// Push a boundary on behalf of the previously-placeholder'd pool.
if (pushExtraBoundary) {
page->add(POOL_BOUNDARY);
}
// Push the requested object or pool.
return page->add(obj);
}
如果第一次向AutoreleasePool入栈对象或者在一个空的AutoreleasePool基础上内嵌另外一个AutoreleasePool时设置需入栈POOL_BOUNDARY标志位(POOL_BOUNDARY是每个不同AutoreleasePool之间的分隔符)
如果在没有AutoreleasePool的基础上入栈对象则Log用户存在内存泄漏
如果入栈对象为POOL_BOUNDARY并且在非DEBUG模式下则设置空AutoreleasePool标志位
创建AutoreleasePoolPage分页并设置为当前分页，根据上述情况判断是否需要插入AutoreleasePool边界标识。最后才入栈所需的对象。
autoreleaseFast(id obj)
static inline id *autoreleaseFast(id obj)
{
AutoreleasePoolPage *page = hotPage();
if (page && !page->full()) {
return page->add(obj);
} else if (page) {
return autoreleaseFullPage(obj, page);
} else {
return autoreleaseNoPage(obj);
}
}
当前存在AutoreleasePoolPage并且AutoreleasePoolPage未满
入栈对象
当前存在AutoreleasePoolPage但AutoreleasePoolPage已满
调用autoreleaseFullPage函数查找未满的子AutoreleasePoolPage进行对象入栈，如果未查找到则创建新的子AutoreleasePoolPage再进行入栈操作
当前不存在AutoreleasePoolPage则调用autoreleaseNoPage函数创建新的autoreleaseNoPage再进行入栈操作
objc_autoreleasePoolPop(void *ctxt)
void objc_autoreleasePoolPop(void *ctxt)
{
AutoreleasePoolPage::pop(ctxt);
} |
