Compute all gimple statements in which a var is used

Richard Biener richard.guenther@gmail.com
Tue Apr 5 15:22:00 GMT 2016


On April 5, 2016 5:03:54 PM GMT+02:00, Jeff Law <law@redhat.com> wrote:
>On 04/05/2016 08:59 AM, Cristina Georgiana Opriceana wrote:
>> On Mon, Mar 28, 2016 at 10:55 PM, Richard Biener
>> <richard.guenther@gmail.com> wrote:
>>> On March 28, 2016 7:23:26 PM GMT+02:00, Cristina Georgiana Opriceana
><cristina.opriceana@gmail.com> wrote:
>>>> Hello,
>>>>
>>>> In order to compute all the statements where a variable is used, is
>it
>>>> enough to rely on the SSA analysis? I tried to do something like
>this:
>>>>
>>>> FOR_EACH_LOCAL_DECL (cfun, i, var) {
>>>>         for (unsigned int i = 0; i < num_ssa_names; i++) {
>>>>             if (ssa_name(i) && SSA_NAME_VAR (ssa_name(i)) == var) {
>>>>                 tree ssa_node = ssa_name(i);
>>>>                 FOR_EACH_IMM_USE_FAST (use_op, imm_iter, ssa_node)
>{
>>>>                     gimple * use_stmt = USE_STMT(use_op);
>>>>                     ...
>>>>                 }
>>>
>>> No, you'll miss variables not in SSA form.
>>>
>>
>> Could you give me more details on this or maybe some reading
>material?
>> As far as I understand, all the VAR_DECL, PARAM_DECL and RESULT_DECL
>> will be in SSA form.
>Only non-addressable _DECL nodes will be in SSA form.
>
>ie, arrays, or objects which have had their address taken will not be
>in 
>SSA form.

All aggregates will not be in SSA form.

Richard.

>jeff




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