我有一个共享目标文件,使用g++构建,如下所示。
g++ -shared -fPIC -lpthread -O1 -std=c++11 -c AOTelemetry.cpp -L /home -I /opt/java7/include/ -I /opt/java7/include/linux/ -lstdc++ -ldl -lcsfutil -lcsfthread -ldata -lservices -lserviceutil -levent -lhealth -o AOTelemetry.so
当在目标文件上运行nm实用程序时,会将许多内存地址引用(我认为它们是这样的)显示为零。这是什么意思?
0000000000000000 V typeinfo name for std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>
0000000000000000 V vtable for ProcessJob
0000000000000000 V vtable for NativePlugin
0000000000000000 V vtable for AOTelemetryPlugin
0000000000000000 V vtable for Shutdown
0000000000000000 V vtable for BdtBuffer
U vtable for __cxxabiv1::__class_type_info
U vtable for __cxxabiv1::__si_class_type_info
0000000000000000 V vtable for std::_Sp_counted_ptr<ProcessJob*, (__gnu_cxx::_Lock_policy)2>
0000000000000000 V vtable for std::_Sp_counted_ptr<Shutdown*, (__gnu_cxx::_Lock_policy)2>
0000000000000000 V vtable for std::_Sp_counted_ptr<BdtBuffer*, (__gnu_cxx::_Lock_policy)2>
0000000000000000 V vtable for std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>