On Friday 12 September 2014 12:14 PM, Jan Hubicka wrote:
I am trying to access the virtual table.
My pass is hooked after pass_ipa_pta.
Consider Class A which contains virtual function.
An object created as :
A a;
is translated in GIMPLE as
struct A a;
From variable "a" we can get its type which is "struct A".
I tried to see how the dump_vtable function access the table.
To access the virtual table for class A, Below is the code which I tried.
tree t = TREE_TYPE (a);
tree binfo = TYPE_BINFO (t);
tree vtab = BINFO_VTABLE (binfo);
FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL
(vtab)), ix, value)
Using the above iterator, entries of the virtual table should be accessible.
However, I am not able to do so.
You can check dump_tree (vtab) to see if you are seeing an VAR_DECL.
BINFO_VTABLE
is usually POINTER_PLUS_EXPR, so you want to access DECL_INITIAL
of TREE_OPERAND (vtab) in that case.
If you want to access an virtual method with given token (position in vtable),
you can just use gimple_get_virt_method_for_binfo (or borrow code from there
for things you need).
Thanks a lot. This helped.
Honza
Kindly inform me the way to access the virtual table.
Also how to fetch the functions from that virtual table?
Regards,
Swati
