Re: LLVM--Low Level Virtual Machine--and Ada

[Markus E Leypold <development-2006-8ecbb5cc8aREMOVETHIS@ANDTHATm-e-leypold.de>]

> On 2007-07-24, Duncan Sands <baldrick@free.fr> wrote:
>
> |-----------------------------------------------------------------------------|
> |" Hi Randy,                                                                  |
> |                                                                             |
> |> Janus/Ada has never used any executable data/stack in its 32-bit versions; |
> |> such code would save no more than a clock cycle or two (out of hundreds or |
> |> thousands) and as such could not be significant. We use compiler-generated |
> |> thunks rather than run-time generated trampolines, and I'm not sure why    |
> |> anyone would use the latter (given that they increase the exploitability of|
> |> a program). Most be something I don't understand...                        |
> |                                                                             |
> | how do these thunks work?                                                   |
> |                                                                             |
> | Thanks,                                                                     |
> |                                                                             |
> | Duncan."                                                                    |
> |-----------------------------------------------------------------------------|
>
> You should pay RR Software for a source code license to obtain that
> information.

You speaking for RR software? AFAIR, Randy has been very forward and
frank in the past to discuss compiler implementation (many thanks to
him: I usually learn something from his posts). How do I have to
understand the "should" in this sentence then?

 - It's a moral obligation.

 - Randy has changed the rules: Thunks (as opposed to other details)
   are only being disclosed against money.

 - ...

Regards -- Markus