How C++ `typeid` operator works

By Lu Pan in c++ on

C++ language include an operator called typeid ( https://en.cppreference.com/w/cpp/language/typeid). > Queries information of a type. Used where the dynamic type of a polymorphic object must be known and for static type identification. It gives you information about the type of an object, as long as…

Debugging Random Program Behavior

By Lu Pan in cpu on

I was looking at a weird coredump the other day. From the core, the program was trying to write to virtual address 0x6 and crashed on memcpy. There's a piece of code looks like if (a == 1) { do_foo(); } else { do_bar(); } And from the coredump, a is indeed 1.…