Visual C ++ 2012中的编译器错误? (搞砸了跳转地址)

时间:2012-11-25 15:51:53

标签: c++ visual-studio visual-c++ compiler-construction

完全编译,无需优化

void Add(T data)
{
    node<T> *pNode = new node<T>;
    pNode->m_pNext = NULL;
    pNode->m_data = data;

    uint32_t cPushes;
    uint32_t cPops;
    node<T> *pTail;

    while (true)
    {
        cPushes = m_cPushes;
        cPops = m_cPops;
        pTail = (node<T>*)m_pTail;
        if (cPushes != m_cPushes)
            continue;

        if (!pTail)
            if (CAS2(&m_pTail, NULL, cPushes, (uint32_t)pNode, cPushes +1))
                break;
        else if (CAS(&pTail->m_pNext, NULL, (uint32_t)pNode))
                break;
        else
            CAS2(&m_pTail, (uint32_t)pTail, cPushes, (uint32_t)pTail->m_pNext, cPushes + 1);
    }

    CAS2(&m_pHead, NULL, cPops, (uint32_t)pNode, cPops + 1);
    CAS2(&m_pTail, (uint32_t)pTail, cPushes, (uint32_t)pNode, cPushes + 1);
}

反汇编:http://pastebin.com/7EaH3whu(因为它很大而且以某种方式打破了代码标签,因此会粘贴)

如果你看一下,关于每个跳转指令的地址都会混淆

例如,如果此语句失败:&#39; if(!pTail)&#39;,而不是继续&#39;否则如果&#39;它会跳回到循环的开头(实际上,它跳转到跳转到循环开始的跳转)

完整代码:http://pastebin.com/U5qGgT0E

1 个答案:

答案 0 :(得分:8)

    if (!pTail)
        if (CAS2(&m_pTail, NULL, cPushes, (uint32_t)pNode, cPushes +1))
            break;
    else if (CAS(&pTail->m_pNext, NULL, (uint32_t)pNode))
            break;
    else
        CAS2(&m_pTail, (uint32_t)pTail, cPushes, (uint32_t)pTail->m_pNext, cPushes + 1);

真的是

    if (!pTail) {
        if (CAS2(&m_pTail, NULL, cPushes, (uint32_t)pNode, cPushes +1)) {
            break;
        } else if (CAS(&pTail->m_pNext, NULL, (uint32_t)pNode)) {
            break;
        } else {
            CAS2(&m_pTail, (uint32_t)pTail, cPushes, (uint32_t)pTail->m_pNext, cPushes + 1);
        }
    }

跳跃是做什么的?我打赌。