Ian, I think you meant 2 byte boundary. corey On 24 Aug 2005 16:18:51 -0700, Ian Lance Taylor <ian@xxxxxxxx> wrote: > "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 >
