"Joe Lovelace" <pintose@xxxxxxxxxxx> writes:
> How does the GNU compiler (2.96 or 3.3 or PPC) layout instances of C++
> class objects in memory?
It varies. For C++ it is mostly described here:
http://www.codesourcery.com/cxx-abi/abi.html
(It says Itanium, but gcc uses it for all targets.)
> For example,
> >class CMyClass{
> private:
> >int a;
> >char b;
> >short c:
> >};
> >
> >CMyClass instance;
> >
> > if &instance is 0x1000, would the memory layout be as follows? Or is
> > it more complex? (Of course the items may be aligned to the
> > processors alignment boundaries ie 32-bit)
> >
> >instance a b c
> >0x1000 0x1000 0x1004 0x1005
Typically 'c' would be aligned to a 2 bit boundary, and thus would be
at address 0x1006. The precise alignment requirements depend on the
processor.
Ian
