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Exceptions/Catch an exception thrown in a nested call: Difference between revisions
Exceptions/Catch an exception thrown in a nested call (view source)
Revision as of 13:09, 16 January 2011
, 13 years ago→{{header|PL/I}}
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=={{header|PL/I}}==
<lang PL/I>
/* Exceptions: Catch an exception thrown in a nested call */
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m = foo();
end test;
DESCRIPTION OF EXECUTION:
Function FOO is invoked.
FOO invokes BAR. BAR invoked BAZ.
In BAZ, exception UO is raised, and is handled in FOO,
which outputs a message and a traceback is produced.
Upon return to BAZ, BAZ terminates, and control returns to FOO.
In FOO, BAR is invoked a second time, which in turn invokes BAZ.
This (second) time that BAZ is invoked, the exception U1 is raised.
As this exception is defined in the outer procedure TEST,
a diagnostic and traceback are produced, and execution resumes
in BAZ, returns to BAR, and then to FOO.
Finally, a return is made to TEST and the program terminates.
OUTPUT:
CONDITION condition was raised
At offset +000000E0 in procedure with entry FOO
From offset +0000007C in procedure with entry TEST
Raised condition U0 in function <bar>.
IBM0400I ONCODE=0500 The CONDITION condition was raised
by a SIGNAL statement and the condition U1 was signaled.
At offset +0000010D in procedure with entry FOO
</lang>
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