85 lines
4.9 KiB
HTML
85 lines
4.9 KiB
HTML
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<meta name="DC.Type" content="task" />
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<meta name="DC.Title" content="Display the call stack" />
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<meta name="abstract" content="You can use the Display Debug (DSPDBG) command to display the call stack." />
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<meta name="DC.subject" content="call stack, description, stack, call, program, call, stack, level, nesting" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Display the call stack</title>
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</head>
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<body id="pgmin"><a name="pgmin"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Display the call stack</h1>
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<div><p>You can use the <span class="cmdname">Display Debug (DSPDBG)</span> command
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to display the call stack.</p>
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<div class="section"> <p>The call stack indicates: </p>
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<ul><li>Which programs are currently being debugged</li>
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<li>The instruction number of the calling instruction or the instruction number
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of each breakpoint at which program processing is stopped</li>
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<li>The program recursion level</li>
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<li>The names of the programs that are in debug mode but have not been called</li>
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</ul>
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<p>A call of a program is the allocation of <em>automatic</em> storage
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for the program and the transfer of machine processing to the program. A series
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of calls is placed in a call stack. When a program finishes processing or
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transfers control, it is removed from the call stack.</p>
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<p>A program may
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be called a number of times while the first call is still in the call stack.
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Each call of a program is a recursion level of the program.</p>
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<p>When a call
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is ended (the program returns or transfers control), automatic storage is
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returned to the system. </p>
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<div class="note"><span class="notetitle">Note:</span> <ol><li>CL programs can be recursive; that is, a CL program can call itself either
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directly or indirectly through a program it has called.</li>
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<li>Some high-level languages do not allow recursive program calls. Other
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languages allow not only programs to be recursive, but also procedures within
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a program to be recursive. (In this guide, the term <em>recursion level</em> refers
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to the number of times the program has been called in the call stack. A procedure's
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recursion level is referred to explicitly as the procedure recursion level.)</li>
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<li>All CL commands and displays make use of only the program qualified name
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recursion level.</li>
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</ol>
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</div>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="pgmac.htm">Program activations</a></strong><br />
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An activation of a program is the allocation of static storage for the program.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="opm.htm" title="You can debug your OPM programs by using testing functions.">Debug OPM programs</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="cflow.htm" title="You can use the Call Program (CALL), Call Bound Procedure (CALLPRC), and Return (RETURN) commands to pass control back and forth between programs and procedures.">Control flow and communicate between programs and procedures</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../cl/dspdbg.htm">Display Debug (DSPDBG) command</a></div>
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</div>
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</div>
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