From: tmcclory@wright.EDU (Tom McClory)
Subject: Novice Questions on Ada Exceptions
Date: 21 Aug 89 01:22:13 GMT [thread overview]
Message-ID: <620@thor.wright.EDU> (raw)
I am attempting to port the Ada Test an Analysis Tools package,
(contributed by Intermetrics to the Ada Repository) to the UNIX
operating system using the Verdix Ada Compiler (release 5.4).
The package compiled with no obvious errors, and what appear
to be minor warnings. However, the program fails during
operation with the following exception message:
** MAIN PROGRAM ABANDONED -- EXCEPTION "program_error" RAISED
The VADS debugger sheds a little more light on this with the
output:
RM 11.3(3): RAISE statement reraised exception
This leads to several questions . . .
1) Does anyone have experience porting/using this "Ada Test
and Analysis Tools" package from the Ada Repository? Are there
any configuration issues I may have missed? The changes I made
were to define a type "long float" and to fix a few typographical
errors (missing spaces) that may have been introduced during upload.
2) A more general question . . . what are typical causes for
"PROGRAM_ERROR" exceptions? More specifically, what might be causing
this error? The text book I'm using (_Understanding Ada_, by
Bray & Pokrass, 1985) mentions only "leaving a function without
executing a return statement." (Won't the compiler catch these?)
3) Even more general . . . what are good strategies for tracking the
source of exceptions in large programs you personally didn't write?
The behavior of the VADS debugger during exception handling seems
shaky (I get warning messages about loosing track of pointers),
so I don't trust the information I've gotten. Neither the error
message, nor the debugger, accurately pinpoint the source of the
exception. Rather, the debugger states "exception raised xxx
instructions beyond the statement shown", which is the last
statement in the last block of whatever file happened to be displayed
when the exception triggered.
Any suggestions are welcomed. Thanks in advance.
next reply other threads:[~1989-08-21 1:22 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
1989-08-21 1:22 Tom McClory [this message]
1989-08-23 12:53 ` Novice Questions on Ada Exceptions stt
1989-08-30 10:00 ` Pragma ELABORATE (was: Re: Novice Questions on Ada Exceptions) adh
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