From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jody Hagins" <jody@atdesk.com>
To: <egcs@egcs.cygnus.com>
Subject: What does the vtable look like?
Date: Wed, 30 Jun 1999 15:43:00 -0000
Message-ID: <004c01beb414$728d96e0$29f782cc@lewstherin.atdesk.com>
X-SW-Source: 1999-06n/msg00381.html
Message-ID: <19990630154300.zxQGF7sOW8O-eixXUsYFxpTMdO1MwrzrSh4VcCP0UuY@z>

With cfront, I can get the virtual function table like so...


struct Virtual_Function_Table_Entry
{
  short d;
  short i;
  int (*f)();
};

The virtual table pointer stored in each object points to an array of
Virtual_Function_Table_Entry structures.

Then I can run through all the virtual functions like so...

class VBase
{
public:
  virtual ~VBase();
};

VBase::
~VBase()
{
}

void print_virtual_functions(VBase * p)
{
  Virtual_Function_Table_Entry * vtbl =
      *((Virtual_Function_Table_Entry**)p);
  for (int i = 0; vtbl[i].f; ++i)
  {
    cout << "virtual function " << i << " is "
         << vtbl[i].f << endl;
  }
}




For egcs, what does the virtual table pointer point to?  Is it a table of
pointers, structures, a linked list of pointers?  What is it?


Thanks!