[LLVMdev] get ref to parent instruction

Eduardo erocha.ssa at gmail.com
Tue Jan 8 16:15:34 PST 2013

Hi Oscar:
In instructions like the one I showed can I expect that Value::use_begin
and Value::use_end will return only the getelementptr or there is a chance
I will get other users of that constant?
Thanks a lot,
On Jan 8, 2013 9:39 PM, "Óscar Fuentes" <ofv at wanadoo.es> wrote:

> Eduardo <erocha.ssa at gmail.com> writes:
> > How can I get a reference to an instruction if I have a reference to
> > an operand? For example, let suppose I have a reference to the
> > ConstantExpr "getelementptr inbounds" in the following instruction:
> >
> >   %4 = getelementptr i32* getelementptr inbounds ([8 x i32]*
> > @__mem_grid_MOD_nnyp, i32 0, i32 0), i32 %3
> >
> > then, how can I get a reference to the GetElementPtrInst object?
> A given Value instance can be an operand of multiple instructions.
> > The reason I need that is because I want to change every instruction
> > that uses certain variables (in the example above the
> > __mem_grid_MOD_nnyp variable). The problem is that for the example I
> > showed the actual user of the variable is a ConstantExpr object and
> > not the GetElementPtrInst object.
> You can traverse the User's of a Value with the iterators returned by
> Value::use_begin and Value::use_end methods.
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