抛出异常会导致分段错误

Question

Collection CollectionFactory::createFromMap(const std::string& name,
        const DataMap& dm) const
{
    if (!Collection::isNameValid(name))
    {
        const std::string error = "invalid collection name";
        throw std::invalid_argument(error);
    }
    Collection c(name, dm);
    dm.initDataCollection(&c, true);
    return c;
}

每当执行throw语句时,我都会遇到分段错误.这是Valgrind输出的原因.我不知道发生了什么.

==21124== Invalid read of size 1
==21124==    at 0x41D2190: parse_lsda_header(_Unwind_Context*, unsigned char const*, lsda_header_info*) (eh_personality.cc:62)
==21124==    by 0x41D24A9: __gxx_personality_v0 (eh_personality.cc:228)
==21124==    by 0x4200220: _Unwind_RaiseException (unwind.inc:109)
==21124==    by 0x41D2C9C: __cxa_throw (eh_throw.cc:75)
==21124==    by 0x4079BFB: corestore::CollectionFactory::createFromMap(std::string const&, corestore::DataMap const&) const (CollectionFactory.C:43)
==21124==    by 0x8188F86: CollectionFactoryTest::testCreateNewFromMap_InvalidName() (CollectionFactoryTest.C:91)
==21124==    by 0x81895D3: CppUnit::TestCaller<CollectionFactoryTest>::runTest() (TestCaller.h:166)
==21124==    by 0x40D1BB5: CppUnit::TestCaseMethodFunctor::operator()() const (TestCase.cpp:34)
==21124==    by 0x40C18E3: CppUnit::DefaultProtector::protect(CppUnit::Functor const&, CppUnit::ProtectorContext const&) (DefaultProtector.cpp:15)
==21124==    by 0x40CD0FC: CppUnit::ProtectorChain::ProtectFunctor::operator()() const (ProtectorChain.cpp:20)
==21124==    by 0x40CCA65: CppUnit::ProtectorChain::protect(CppUnit::Functor const&, CppUnit::ProtectorContext const&) (ProtectorChain.cpp:77)
==21124==    by 0x40DC6C4: CppUnit::TestResult::protect(CppUnit::Functor const&, CppUnit::Test*, std::string const&) (TestResult.cpp:178)
==21124==  Address 0xc82f is not stack'd, malloc'd or (recently) free'd

我已经进行了多次单元测试的重复轰炸,但是现在这个是与其他所有相同的错误:

void CollectionFactoryTest::testCreateNewFromMap_InvalidName()
{
    const char* MAP_FILE =
            "smallMapWithThreeSets.xml";
    const char* NAME1 = "name/invalidname";
    const char* NAME2 = "name/invalidname";

    DataMapReader dmr;
    DataMap dm = dmr.getDataMapFromFile(MAP_FILE);

    CollectionFactory cf;
    try
    {
        cf.createFromMap(NAME1, dm);
    }
    catch (std::exception const& e)
    {
        std::cerr << e.what() << std::endl;
    }

    /*CPPUNIT_ASSERT_THROW(cf.createFromMap(NAME1, dm), std::invalid_argument);
    CPPUNIT_ASSERT_THROW(cf.createFromMap(NAME2, dm), std::invalid_argument);*/
}

每个请求,isNameValid的内容:

bool Collection::isNameValid(const std::string& name)
{
    /* can't be blank */
    if(name.length() == 0)
    {
        return false;
    }
    /* Can't contain '/' */
    if(name.find('/') != std::string::npos)
    {
        return false;
    }
    return true;
}

Answer 1

这是 Valgrind 的第一个错误还是以前有过错误？

我的猜测是，之前有一些问题，其中之一正在破坏内存并导致 throw 中断。