llvm dev - Jun 2013 - [LLVMdev] Getting the memory address of all operands on an expression

> in LLVM IR, the operands of most expression are registers, so don't
have a
memory address.

Yes I agree with your this statement,
But before becoming part of the expressions, the registers will actually
fetch some value from memory, through Load operations.
as shown in example "r3=r1+r2" will be the expression, where registers
such
as r1 and r2 contains (fetch) the values from the memory address b and c
resp. .
I want to know the way through which i can get this memory address of b and
c (in hexadecimal format).





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On Mon, Jun 17, 2013 at 11:49 PM, Abhinash Jain <omnia at
mailinator.com>wrote:
>
> But before becoming part of the expressions, the registers will actually
> fetch some value from memory, through Load operations.
>
This is not true; the virtual registers need not be loaded from memory. You
may find <
http://llvm.org/docs/FAQ.html#what-api-do-i-use-to-store-a-value-to-one-of-the-virtual-registers-in-llvm-ir-s-ssa-representation>
helpful.

-- Sean Silva
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In short if suppose i have some expression as a=b+c-d*e,  and with the help
of LLVM pass i want to make a string like this:-    

"[Hexadecimal address of 'b'] [opcode of +] [Hexadecimal address of
'c']
[opcode of -] [Hexadecimal address of 'd'] [opcode of *] [Hexadecimal
address of 'e']".

Than how can i make it................



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On 18/06/13 19:31, Sean Silva wrote:
>
>
>
> On Mon, Jun 17, 2013 at 11:49 PM, Abhinash Jain <omnia at mailinator.com
> <mailto:omnia at mailinator.com>> wrote:
>
>     But before becoming part of the expressions, the registers will
actually
>     fetch some value from memory, through Load operations.
>
> This is not true; the virtual registers need not be loaded from memory. You
may
> find
>
<http://llvm.org/docs/FAQ.html#what-api-do-i-use-to-store-a-value-to-one-of-the-virtual-registers-in-llvm-ir-s-ssa-representation>
> helpful.
If it is loaded from memory you may be able to get hold of the load instruction
using GetUnderlyingObject or GetUnderlyingObjects
(see include/llvm/Analysis/ValueTracking.h), as I think I mentioned already in
my first reply.

Ciao, Duncan.