Re: Getting DWARF codes from RTX

[Ian Lance Taylor <iant@google.com>]

"Iyer, Balaji V" <balaji.v.iyer@intel.com> writes:

> 	What I want to do is to look at certain function calls and mark them with a special label and then create a table  with a specialized section with contains the label name, the function name (as ascii string) and then the dwarf code of the register (assuming the parameters can be passed in through registers, otherwise the stack address location) in which the parameters for the function is stored. (Please note that this is something that is customized for another package and I don't have much leeway on how to store this information)
>
> Eg.
>
> If you have:   
> some_func_call (x, y, z)
>
> We will have an assembly like this
>
> 	Set R1, x
> 	Set R2, y
> 	Set R3, z
> LABEL_X:                        <=== SOMETHING I PUT IN
> 	Call some_func_call
>
>
> In my data section I would have something like this:
>
> LABEL_X 
> some_func_call
> DW_OP_REG1, DW_OP_REG2, DW_OP_REG3

OK, I think I mostly understand all that.

> So, I need the equivalent dwarf code (in hex) for DW_OP_REG1, DW_OP_REG2 and DW_OP_REG3, so that a dwarf decoder can decode it correctly.

I'm not sure I understand that.  The code for DW_OP_reg1 is 0x51, as you
can see in include/dwarf2.h.  But I don't think that is what you mean.

It sounds like you might be asking for a way to get the DWARF
representation of the argument locations of the function call.  See
loc_descriptor in gcc/dwarf2out.c.

Ian