From: tim@trident.datasys.swri.edu (Timothy J. Barton)
Subject: Exception handler question
Date: 11 Mar 93 20:17:34 GMT
Date: 1993-03-11T20:17:34+00:00 [thread overview]
Message-ID: <318@trident.datasys.swri.edu> (raw)
Please help me in my ignorance of Ada exception handlers. I am using Sun
Ada and am trying to trap the usage of an out of range value being passed
to another program unit. I have an exception handler with
"when CONSTRAINT_ERROR" and "when others", but the exception handler is not
getting called. When I run the program in the Sun Ada debugger, I get the
message:
"Illegal instruction" [4] Software trap: range check
Program execution is halted, I can't single step any further. In other
cases where I trap an exception, a single step would take me to the
exception hanlder source lines. If I run the program outside the debugger,
very bad things happen (and happen so fast I can't read the message which
flashes by) and then my program and xterm go away.
Program looks like the following:
---------------------------------
subtype COLUMN is INTEGER range 0..100;
procedure example is
begin
OtherFunction( COLUMN(101) ); -- CONSTRAINT error here!
exception
when CONSTRAINT_ERROR => do something
when others => do something
end example;
---------------------------------
What am I doing wrong? Why doesn't my exception handler get called? Any
help would be greatly appreciated.
----------------------------------------------------------------------------
Timothy J. Barton tim@trident.datasys.swri.edu
Senior Research Analyst (210) 522-3540
Southwest Research Institute (SwRI) (210) 522-5499 (Fax)
San Antonio, Texas 78228-0510
next reply other threads:[~1993-03-11 20:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
1993-03-11 20:17 Timothy J. Barton [this message]
1993-03-12 20:01 ` Exception handler question Brian Hanafee
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