<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Call Stack (GNU Octave (version 5.1.0))</title> <meta name="description" content="Call Stack (GNU Octave (version 5.1.0))"> <meta name="keywords" content="Call Stack (GNU Octave (version 5.1.0))"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <link href="index.html#Top" rel="start" title="Top"> <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> <link href="Debugging.html#Debugging" rel="up" title="Debugging"> <link href="Profiling.html#Profiling" rel="next" title="Profiling"> <link href="Debug-Mode.html#Debug-Mode" rel="prev" title="Debug Mode"> <style type="text/css"> <!-- a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} blockquote.smallquotation {font-size: smaller} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} div.lisp {margin-left: 3.2em} div.smalldisplay {margin-left: 3.2em} div.smallexample {margin-left: 3.2em} div.smalllisp {margin-left: 3.2em} kbd {font-style: oblique} pre.display {font-family: inherit} pre.format {font-family: inherit} pre.menu-comment {font-family: serif} pre.menu-preformatted {font-family: serif} pre.smalldisplay {font-family: inherit; font-size: smaller} pre.smallexample {font-size: smaller} pre.smallformat {font-family: inherit; font-size: smaller} pre.smalllisp {font-size: smaller} span.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} ul.no-bullet {list-style: none} --> </style> <link rel="stylesheet" type="text/css" href="octave.css"> </head> <body lang="en"> <a name="Call-Stack"></a> <div class="header"> <p> Next: <a href="Profiling.html#Profiling" accesskey="n" rel="next">Profiling</a>, Previous: <a href="Debug-Mode.html#Debug-Mode" accesskey="p" rel="prev">Debug Mode</a>, Up: <a href="Debugging.html#Debugging" accesskey="u" rel="up">Debugging</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> </div> <hr> <a name="Call-Stack-1"></a> <h3 class="section">13.5 Call Stack</h3> <p>The function being debugged may be the leaf node of a series of function calls. After examining values in the current subroutine it may turn out that the problem occurred in earlier pieces of code. Use <code>dbup</code> and <code>dbdown</code> to move up and down through the series of function calls to locate where variables first took on the wrong values. <code>dbstack</code> shows the entire series of function calls and at what level debugging is currently taking place. </p> <a name="XREFdbstack"></a><dl> <dt><a name="index-dbstack"></a><em></em> <strong>dbstack</strong></dt> <dt><a name="index-dbstack-1"></a><em></em> <strong>dbstack</strong> <em><var>n</var></em></dt> <dt><a name="index-dbstack-2"></a><em></em> <strong>dbstack</strong> <em><var>-completenames</var></em></dt> <dt><a name="index-dbstack-3"></a><em>[<var>stack</var>, <var>idx</var>] =</em> <strong>dbstack</strong> <em>(…)</em></dt> <dd><p>Display or return current debugging function stack information. </p> <p>With optional argument <var>n</var>, omit the <var>n</var> innermost stack frames. </p> <p>Although accepted, the argument <var>-completenames</var> is silently ignored. Octave always returns absolute filenames. </p> <p>The arguments <var>n</var> and <var>-completenames</var> can be both specified in any order. </p> <p>The optional return argument <var>stack</var> is a struct array with the following fields: </p> <dl compact="compact"> <dt>file</dt> <dd><p>The name of the m-file where the function code is located. </p> </dd> <dt>name</dt> <dd><p>The name of the function with a breakpoint. </p> </dd> <dt>line</dt> <dd><p>The line number of an active breakpoint. </p> </dd> <dt>column</dt> <dd><p>The column number of the line where the breakpoint begins. </p> </dd> <dt>scope</dt> <dd><p>Undocumented. </p> </dd> <dt>context</dt> <dd><p>Undocumented. </p></dd> </dl> <p>The return argument <var>idx</var> specifies which element of the <var>stack</var> struct array is currently active. </p> <p><strong>See also:</strong> <a href="#XREFdbup">dbup</a>, <a href="#XREFdbdown">dbdown</a>, <a href="Debug-Mode.html#XREFdbwhere">dbwhere</a>, <a href="Debug-Mode.html#XREFdblist">dblist</a>, <a href="Breakpoints.html#XREFdbstatus">dbstatus</a>. </p></dd></dl> <a name="XREFdbup"></a><dl> <dt><a name="index-dbup"></a><em></em> <strong>dbup</strong></dt> <dt><a name="index-dbup-1"></a><em></em> <strong>dbup</strong> <em><var>n</var></em></dt> <dd><p>In debugging mode, move up the execution stack <var>n</var> frames. </p> <p>If <var>n</var> is omitted, move up one frame. </p> <p><strong>See also:</strong> <a href="#XREFdbstack">dbstack</a>, <a href="#XREFdbdown">dbdown</a>. </p></dd></dl> <a name="XREFdbdown"></a><dl> <dt><a name="index-dbdown"></a><em></em> <strong>dbdown</strong></dt> <dt><a name="index-dbdown-1"></a><em></em> <strong>dbdown</strong> <em><var>n</var></em></dt> <dd><p>In debugging mode, move down the execution stack <var>n</var> frames. </p> <p>If <var>n</var> is omitted, move down one frame. </p> <p><strong>See also:</strong> <a href="#XREFdbstack">dbstack</a>, <a href="#XREFdbup">dbup</a>. </p></dd></dl> <hr> <div class="header"> <p> Next: <a href="Profiling.html#Profiling" accesskey="n" rel="next">Profiling</a>, Previous: <a href="Debug-Mode.html#Debug-Mode" accesskey="p" rel="prev">Debug Mode</a>, Up: <a href="Debugging.html#Debugging" accesskey="u" rel="up">Debugging</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> </div> </body> </html>