Re: What should the call stack look like when calling a C++ virtual function?

[Dev1024]

I'm looking at XPCOM now.  If I can validate that it works with both
compilers, I'll submit a follow-up post here.

Thanks!
Dev1024

PS.  For anyone who reads this at a later time, back to my original
submission, I did find that the MSVC compiler is also passing in the
"this" pointer as well. Note, however, that it doesn't pass it in on
the stack as g++ does.  Instead it loads it into ECX.  See:
        testptr->TestFunc(1, 2, 3);
0040102B  mov         eax,dword ptr [esi]   //load EAX with the address
of the function
0040102D  push        3                            //load params onto
the stack
0040102F  push        2
00401031  push        1
00401033  mov         ecx,esi                   //HERE IT IS.  Load
"this" pointer into ECX
00401035  call        dword ptr [eax]         //call the method

A good tutorial on the way MSVC does virtual functions is provided
here:
http://msdn.microsoft.com/msdnmag/issues/0300/c/