Re: [Plplot-devel] Looking into problem with Ada example 19

[Jerry]

On 2008-08-23 18:54-0700 Jerry wrote:

There have been some posts about Ada example 19 (both x19a.adb and
xthick19a.adb) causing problems, possibly on 64-bit systems but not
32-bit systems.

Fortunately, example 19 is short.

Unfortunately, example 19 runs fine on my machine, OS X.

Could someone send me detailed info about what happens? On 7/18/08,
Alan indicated this runtime error:

raised STORAGE_ERROR : stack overflow (or erroneous memory access)

That is the only message that is given.

This is an Ada exception being raised. Was there a line number
associated with this output?

Unfortunately, not.

I would like to try to find, as exactly as possible, where this
problem is arising.

I surrounded the plmap and plmeridians calls with

if 0 =/0 then
end if;

then selectively tried

if 0 =/1 then


but that both the plmap(mapform19'Unrestricted_Access...

the above run-time error.

BTW, I notice the x16a.adb callbacks are specified with a different
access method that does not seem to generate a run-time error, i.e.,

plshades(... plfill'access, True, pltr1'access, cgrid1'Address);

Is it possible to use that method instead for example 19?

I simply tried plmap(mapform19'access...

but that generated a build error of
x19a.adb:113:13: subprogram must not be deeper than access type
x19a.adb:118:19: subprogram must not be deeper than access type
make[2]: *** [examples/ada/CMakeFiles/x19a.dir/x19a.o] Error 1


to mapform19.


test example that is completely independent of PLplot that I can try.

Alan

It turns out the first two plmap(null... calls generate no run-time error, and plmeridians(mapform19'Unrestricted_Access... calls individually generate I don't understand why this won't build (probably because my Ada languague skills are so limited) since pltr1, for example, is an Ada procedure similar If there is no easy way to mimic what example 16 does, then at least I have pinned down two separate instances of one line of code that generates the run-time error, and I hope you can use that to generate a self- contained

Attached is a zip file with three short Ada files in it. They have a similar structure to the problematic example 19 but do not call or link to any PLplot stuff (despite the names of some things looking PLplot-y).

gnatmake ./x19a_temp.adb





This compiles and runs OK on my system.

Jerry

Alan (or someone else with a 64-bit Ada compiler), if you would, please unzip, cd to the directory, and type You should see two warnings but no errors. If it compiles, the executable will be called x19a_temp. Try to run it and see what happens. It should print out 10 lines of floats. I think there is a low probability that this will point to a compiler error but we need to try it anyway. P.S. My e-mail service (Qwest in U.S.) apparently blocks attachments with the .zip appendage.

Temp_PLplot_Ada_Example 19
Description: Binary data

-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
Plplot-devel mailing list
Plplot-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/plplot-devel