Re: Extracting operand name and value from GIMPLE assignment statements

[Sandeep K Chaudhary <babbusandy2006 at gmail dot com>]

Hi Ian,

Thanks for the reply !

I mean that I am interested in knowing the name of variables from the
code. For example - if there is a statement in the C code like this -

"VAR_A = 100;"

I would like to know the name of the variable i.e. "VAR_A" in the
GIMPLE statement. Please let me know how this can be achieved.

Thanks and regards,
Sandeep.

On Mon, Dec 9, 2013 at 9:13 PM, Ian Lance Taylor <iant@google.com> wrote:
> On Mon, Dec 9, 2013 at 3:05 PM, Sandeep K Chaudhary
> <babbusandy2006@gmail.com> wrote:
>>
>> I am writing a GCC plugin in which I need to extract the variable name
>> and the assigned value from the statements.
>>
>> I am able to get the three operands from GIMPLE statements like this
>>
>>         if(is_gimple_assign(stmt)) {
>>                 tree lhsop = gimple_assign_lhs(stmt);
>>                 tree rhsop1 = gimple_assign_rhs1(stmt);
>>                 tree rhsop2 = gimple_assign_rhs2(stmt);
>>          }
>>
>> I want to get the exact variable name from lhsop and value from rhsop1
>> (for statements such as
>> "var = value;", rhsop2 is 0 for such statements.). Some pointers to
>> example code or documentation would be great.
>
> Can you expand on what you mean by the variable name?  GCC freely
> introduces and discards variables in GIMPLE.  Many GIMPLE variables do
> not have any meaningful name.
>
> Ian



-- 
Thanks and regards,
Sandeep K Chaudhary.