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  1.  Home
  2. RPG400-L
  3. October 2000

RE: RPG400-L Digest V2 #357

dump job internal.  Beware, this is the dreaded hex dump of yore, just a lot
better documented.

After running the dump, find the stack entry for the program in question.
The stack entry for a given program should include the registers, a straight
dump of the code segment, the exception handlers, and a list of all
variables created for that program.  The virtual address should be obvious
(I'm doing this from memory, no available machine) there should be a base
pointer that is probably 512 byte aligned then the variables should be noted
with offsets from the base.  Variables should show name, offset, and value.
As Jon noted, there will be filler variables and compiler-internal variables
in this list.

I think I remember doing the same thing with dump system object.  It takes a
little longer but the answer is more focused.

Richard Jackson
mailto:richardjackson@richardjackson.net
http://www.richardjacksonltd.com
Voice: 1 (303) 808-8058
Fax:   1 (303) 663-4325

-|-----Original Message-----
-|From: owner-rpg400-l@midrange.com [mailto:owner-rpg400-l@midrange.com]On
-|Behalf Of Peter Dow
-|Sent: Tuesday, October 10, 2000 10:14 PM
-|To: RPG400-L@midrange.com
-|Subject: Re: RPG400-L Digest V2 #357
-|
-|
-|Hi Richard,
-|
-|Where can I see the virtual address? I heard that the RPG ILE compiler no
-|longer has an option to print the MI. Is a pointer a virtual
-|address? If so,
-|I could move the pointer to a 16-byte field and look at the
-|low-order byte?
-|
-|Regards,
-|Peter Dow
-|Dow Software Services, Inc.
-|909 425-0194 voice
-|909 425-0196 fax
-|
-|
-|
-|----- Original Message -----
-|From: "Richard Jackson" <richardjackson@richardjackson.net>
-|To: <RPG400-L@midrange.com>
-|Sent: Tuesday, October 10, 2000 4:05 PM
-|Subject: RE: RPG400-L Digest V2 #357
-|
-|
-|> look at the virtual address of the object in storage.  If the low-order
-|byte
-|> of the address is a zero, the object is 16-byte aligned.  If
-|the low order
-|> address byte is even (0, 2, 4, ...) the object is at least
-|2-byte aligned.
-|> And so forth.
-|>
-|> Richard Jackson
-|> mailto:richardjackson@richardjackson.net
-|> http://www.richardjacksonltd.com
-|> Voice: 1 (303) 808-8058
-|> Fax:   1 (303) 663-4325
-|>
-|> -|-----Original Message-----
-|> -|From: owner-rpg400-l@midrange.com
-|[mailto:owner-rpg400-l@midrange.com]On
-|> -|Behalf Of Peter Dow
-|> -|Sent: Tuesday, October 10, 2000 1:27 PM
-|> -|To: RPG400-L@midrange.com
-|> -|Subject: Re: RPG400-L Digest V2 #357
-|> -|
-|> -|
-|> -|Hi Ken,
-|> -|
-|> -|How can one tell what boundary a data structure, or any other
-|> -|field for that
-|> -|matter, is aligned on?
-|> -|
-|> -|Curious,
-|> -|Peter Dow
-|> -|Dow Software Services, Inc.
-|> -|909 425-0194 voice
-|> -|909 425-0196 fax
-|> -|
-|> -|----- Original Message -----
-|> -|From: "Sims, Ken" <KSIMS@SOUTHERNWINE.com>
-|> -|To: <rpg400-l@midrange.com>
-|> -|Sent: Tuesday, October 10, 2000 10:08 AM
-|> -|Subject: RE: RPG400-L Digest V2 #357
-|> -|
-|> -|
-|> -|> Hi Peter -
-|> -|>
-|> -|> >The V4R4 RPG ILE manual says:
-|> -|>  ...
-|> -|> >The position they're talking about is the position of the
-|> -|subfield within
-|> -|a
-|> -|> >data structure, so if the above is true, one would have to assume
-|that
-|> -|the
-|> -|> >data structure begins on a 16-byte boundary. It would be
-|nice if they
-|> -|> >explicitly said that, and assured us it won't change from
-|release to
-|> -|> >release.
-|> -|>
-|> -|> Based on my experimentation, since the compiler rejects pointers
-|defined
-|> -|> with from/to positioning that is not on a 16-byte boundary,
-|it appears
-|> -|that
-|> -|> data structures with pointers are always aligned on a 16-byte
-|boundary.
-|> -|> Only pointer fields *have* to be aligned on a 16-byte boundary.
-|> -| No other
-|> -|> fields *have* to be aligned on any particular boundary, and no other
-|> -|fields
-|> -|> need a 16-byte alignment for best performance; therefore there
-|> -|is nothing
-|> -|to
-|> -|> imply that any data structure not containing pointers is
-|aligned on a
-|> -|> 16-byte boundary.
-|> -|>
-|> -|> The data structure being discussed in this thread does not
-|> -|contain actual
-|> -|> pointer fields since it is an externally described data structure
-|using
-|> -|> character fields to hold pointers, therefore there is no reason
-|> -|to assume
-|> -|> any particular alignment.
-|> -|>
-|> -|> The use of the ALIGN keyword does not imply changing the data
-|structure
-|> -|> itself to ANY particular byte alignment, only to adding padding
-|between
-|> -|> individual fields in the data structure to align float, signed
-|integer,
-|> -|and
-|> -|> unsigned integer fields for performance.
-|> -|>
-|> -|> Ken
-|> -|> Southern Wine and Spirits of Nevada, Inc.
-|> -|> Opinions expressed are my own and do not necessarily represent the
-|views
-|> -|of
-|> -|> my employer or anyone in their right mind.
-|> -|>
-|> -|> +---
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