[llvm-dev] Dumping the Vtable

[Hans Wennborg via llvm-dev]

Hi Damilola,

On Mon, May 29, 2017 at 5:20 AM, Damilola Orikogbo via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> Can someone help me with how to dump the vtable and the vptr addresses
> within it?

I'm not sure if this answers your question exactly, but you can pass
"-Xclang -fdump-vtable-layouts" to ask Clang to dump the layout of
generated vtables. For example:

$ cat /tmp/a.cc
struct S {
  virtual void f() {};
};

void f(S * s) {
  s->f();
}
$ bin/clang++ -c /tmp/a.cc -Xclang -fdump-vtable-layouts
Vtable for 'S' (3 entries).
   0 | offset_to_top (0)
   1 | S RTTI
       -- (S, 0) vtable address --
   2 | void S::f()

VTable indices for 'S' (1 entries).
   0 | void S::f()


 - Hans