This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: how to get the field_id for member of structure in gcc front end


I need the field_info to help in alias analysis. for example:
int *p = &pair.a;
int *q = &pair.b;

then if I can set length of "*p" to 4,ofset is '0' . for "*q" to
"8,4". also I know that p definitly points to pair.a and q points to
pair.b, then i can say "*p" and "*q" are not aliased with each other.

thanks.

tianwei

On 3/29/06, Tianwei Sheng <tianwei.sheng@gmail.com> wrote:
> Hi all:
>    for the following statement, how can I get the field_id info for
> the structure member
>   struct{
>   int a;
>   int b;
> } pair;
> int main()
> {
>   int * p = &pair.a;
> }
>
> It seems that we can't get the field_id info because of address taken
> operator. it treats the "&pair.a" as "&pair + ofset of a".
> I am not familiar with the gcc tree. any one know this?
>
> thanks.
>
> tianwei
>


--
Sheng, Tianwei
Inst. of High Performance Computing
Dept. of Computer Sci. & Tech.
Tsinghua Univ.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]