How to find the vptr and vtable address

Hi experts,
I am doing some in investigation on c++ crashes and wanted to dome experiment by corrupting the vptr of a class. I know the memory layout of an object depends on the compiler. I am using gcc and want to access the vptr. Also, is there a way to find the address of vtable.
Using Gdb is fine too
ambuliAsked:
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jkrCommented:
Simtimes Wikipedia is more useful than you expect it to be, see http://en.wikipedia.org/wiki/Virtual_method_table and especiay "Notes" as well as http://sourcery.mentor.com/public/cxx-abi/cxx-closed.html (also from that article) for other compiler verions and OS flavors.
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ambuliAuthor Commented:
Thank you jkr. Yes, it appears fdump-class-hierarchy should help me. I will read through the wikipedia article.
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