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<title>Stacks (Guile Reference Manual)</title>
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<p>
Next: <a href="Frames.html" accesskey="n" rel="next">Frames</a>, Previous: <a href="Stack-Capture.html" accesskey="p" rel="prev">Stack Capture</a>, Up: <a href="Evaluation-Model.html" accesskey="u" rel="up">Evaluation and the Scheme Stack</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<h4 class="subsubsection" id="Stacks-1"><span>6.26.1.2 Stacks<a class="copiable-link" href="#Stacks-1"> &para;</a></span></h4>
<dl class="first-deffn">
<dt class="deffn" id="index-stack_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">stack?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-stack_003f"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-scm_005fstack_005fp"><span class="category-def">C Function: </span><span><strong class="def-name">scm_stack_p</strong> <var class="def-var-arguments">(obj)</var><a class="copiable-link" href="#index-scm_005fstack_005fp"> &para;</a></span></dt>
<dd><p>Return <code class="code">#t</code> if <var class="var">obj</var> is a calling stack.
</p></dd></dl>
<dl class="first-deffn">
<dt class="deffn" id="index-stack_002did"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">stack-id</strong> <var class="def-var-arguments">stack</var><a class="copiable-link" href="#index-stack_002did"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-scm_005fstack_005fid"><span class="category-def">C Function: </span><span><strong class="def-name">scm_stack_id</strong> <var class="def-var-arguments">(stack)</var><a class="copiable-link" href="#index-scm_005fstack_005fid"> &para;</a></span></dt>
<dd><p>Return the identifier given to <var class="var">stack</var> by <code class="code">start-stack</code>.
</p></dd></dl>
<dl class="first-deffn">
<dt class="deffn" id="index-stack_002dlength"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">stack-length</strong> <var class="def-var-arguments">stack</var><a class="copiable-link" href="#index-stack_002dlength"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-scm_005fstack_005flength"><span class="category-def">C Function: </span><span><strong class="def-name">scm_stack_length</strong> <var class="def-var-arguments">(stack)</var><a class="copiable-link" href="#index-scm_005fstack_005flength"> &para;</a></span></dt>
<dd><p>Return the length of <var class="var">stack</var>.
</p></dd></dl>
<dl class="first-deffn">
<dt class="deffn" id="index-stack_002dref"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">stack-ref</strong> <var class="def-var-arguments">stack index</var><a class="copiable-link" href="#index-stack_002dref"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-scm_005fstack_005fref"><span class="category-def">C Function: </span><span><strong class="def-name">scm_stack_ref</strong> <var class="def-var-arguments">(stack, index)</var><a class="copiable-link" href="#index-scm_005fstack_005fref"> &para;</a></span></dt>
<dd><p>Return the <var class="var">index</var>&rsquo;th frame from <var class="var">stack</var>.
</p></dd></dl>
<dl class="first-deffn">
<dt class="deffn" id="index-display_002dbacktrace"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">display-backtrace</strong> <var class="def-var-arguments">stack port [first [depth [highlights]]]</var><a class="copiable-link" href="#index-display_002dbacktrace"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-scm_005fdisplay_005fbacktrace_005fwith_005fhighlights"><span class="category-def">C Function: </span><span><strong class="def-name">scm_display_backtrace_with_highlights</strong> <var class="def-var-arguments">(stack, port, first, depth, highlights)</var><a class="copiable-link" href="#index-scm_005fdisplay_005fbacktrace_005fwith_005fhighlights"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-scm_005fdisplay_005fbacktrace"><span class="category-def">C Function: </span><span><strong class="def-name">scm_display_backtrace</strong> <var class="def-var-arguments">(stack, port, first, depth)</var><a class="copiable-link" href="#index-scm_005fdisplay_005fbacktrace"> &para;</a></span></dt>
<dd><p>Display a backtrace to the output port <var class="var">port</var>. <var class="var">stack</var>
is the stack to take the backtrace from, <var class="var">first</var> specifies
where in the stack to start and <var class="var">depth</var> how many frames
to display. <var class="var">first</var> and <var class="var">depth</var> can be <code class="code">#f</code>,
which means that default values will be used.
If <var class="var">highlights</var> is given it should be a list; the elements
of this list will be highlighted wherever they appear in the
backtrace.
</p></dd></dl>
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Next: <a href="Frames.html">Frames</a>, Previous: <a href="Stack-Capture.html">Stack Capture</a>, Up: <a href="Evaluation-Model.html">Evaluation and the Scheme Stack</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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