On 01 Nov 2006 08:14:36 -0800, Ian Lance Taylor <iant@xxxxxxxxxx> wrote:
"Bharati Bhole" <bharati.bhole@xxxxxxxxx> writes:
> I am not able to understand the structure of rtx_def fully its too complicated.
> Could anybody please guide me. Its defined in rtl.h.
> struct rtx_def GTY((chain_next ("RTX_NEXT (&%h)"),
> chain_prev ("RTX_PREV (&%h)")))
> {
> ENUM_BITFIELD(rtx_code) code: 16;
> ENUM_BITFIELD(machine_mode) mode : 8;
> unsigned int jump : 1;
> unsigned int call : 1;
> unsigned int unchanging : 1;
> unsigned int volatil : 1;
> unsigned int in_struct : 1;
> unsigned int used : 1;
> unsigned frame_related : 1;
> unsigned return_val : 1;
> union u {
> rtunion fld[1];
> HOST_WIDE_INT hwint[1];
> } GTY ((special ("rtx_def"), desc ("GET_CODE (&%0)"))) u;
> };
What is your specific question?
The GTY construct is documented in gcc/doc/gty.texi. Everything else
is pretty standard. You can find the definition of ENUM_BITFIELD by
using grep.
Ian
I want to know what part of rtx each field in this structure stores.
While tracing through gdb i tried to print the rtx, and i was not able
to understand that. Could u please explain me it with a sample RTX
that what value these fields have.
Bharati.
