Re: MPS: Loaded pdump

["Gerd Möllmann" <gerd.moellmann@gmail.com>]

Helmut Eller <eller.helmut@gmail.com> writes:

> On Thu, May 09 2024, Gerd Möllmann wrote:
>
>> Helmut Eller <eller.helmut@gmail.com> writes:
>>
>>> On Thu, May 09 2024, Gerd Möllmann wrote:
>>>
>>>> - The root is unstructured. We can't scan exactly, and so can't do
>>>>   anything special for pointers to non-MPS memory that Lisp objects
>>>>   have. This leads to some horrible workarounds.
>>>
>>> The pdumper could put the different types (cons, symbol, string,
>>> vectorlike) in different sections.  Then we could probably scan it
>>> exactly.
>>
>> Either that, or we could dump the igc_header with the objects. Don't
>> know how difficult that would be. My gut tells me introducing more
>> sections than the 3 we have could be more work.
>
> Had forgotten about that; with the additional advantage that the
> existing scan code would work right away.

But this looks also interesting

  struct dump_header
  {
    ...
    /* "Relocation" table we abuse to hold information about the
       location and type of each lisp object in the dump.  We need for
       pdumper_object_type and ultimately for conservative GC
       correctness.  */
    struct dump_table_locator object_starts;

I think I'll read the pdumper code a bit more in the next days.