'Understanding names of classes in output of `-dump-lang-class`

I have the following code

class Base
{
  public:
  int bi;
};

class Parent1 : public Base {
public:
  int p1i;
  long p1l;
  void f(){};
  void f3(){};
};

class Parent2 : public Base {
public:
  long p2i;
  int p2l;
  void f(){};
  void f3(){};
};

I dump the class hierarchy using g++ -fdump-lang-class -g main.cpp and I get the following

Class Base
   size=4 align=4
   base size=4 base align=4
Base (0x0x7f65e57a9420) 0

Class Parent1
   size=16 align=8
   base size=16 base align=8
Parent1 (0x0x7f65e564a340) 0
Base (0x0x7f65e57a9480) 0

Class Parent2
   size=24 align=8
   base size=20 base align=8
Parent2 (0x0x7f65e564a3a8) 0
Base (0x0x7f65e57a95a0) 0

I understand the size and align values for the class and the base entries. But I am trying to wrap my head around the hexadecimal values at the end of each class. Here are my questions:

  • It starts with double 0x, so I am not sure if this truly hexadecimal numbers or not.
  • Are they memory addresses for constructors? if yes, why there are two copies of the same constructor ?
  • The order of names to the left of them are the order of constructor hierarchy.
  • What are the zeros to the right of them ?

N.B: I know that stack-over-flow has similar questions, but they explain the size and align values only. None explains the other part.

c++gcc


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Source: Stack Overflow

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