177 lines
9.3 KiB
HTML
177 lines
9.3 KiB
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<!DOCTYPE html>
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled "GNU Free
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Documentation License." -->
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<title>Debug Commands (Guile Reference Manual)</title>
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<meta name="description" content="Debug Commands (Guile Reference Manual)">
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="REPL-Commands.html" rel="up" title="REPL Commands">
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<link href="Inspect-Commands.html" rel="next" title="Inspect Commands">
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<link href="Profile-Commands.html" rel="prev" title="Profile Commands">
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</head>
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<body lang="en">
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<div class="subsubsection-level-extent" id="Debug-Commands">
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<div class="nav-panel">
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<p>
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Next: <a href="Inspect-Commands.html" accesskey="n" rel="next">Inspect Commands</a>, Previous: <a href="Profile-Commands.html" accesskey="p" rel="prev">Profile Commands</a>, Up: <a href="REPL-Commands.html" accesskey="u" rel="up">REPL Commands</a> [<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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</div>
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<hr>
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<h4 class="subsubsection" id="Debug-Commands-1"><span>4.4.4.6 Debug Commands<a class="copiable-link" href="#Debug-Commands-1"> ¶</a></span></h4>
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<p>These debugging commands are only available within a recursive REPL;
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they do not work at the top level.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-backtrace"><span class="category-def">REPL Command: </span><span><strong class="def-name">backtrace</strong> <var class="def-var-arguments">[count] [#:width w] [#:full? f]</var><a class="copiable-link" href="#index-backtrace"> ¶</a></span></dt>
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<dd><p>Print a backtrace.
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</p>
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<p>Print a backtrace of all stack frames, or innermost <var class="var">count</var> frames.
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If <var class="var">count</var> is negative, the last <var class="var">count</var> frames will be shown.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-up"><span class="category-def">REPL Command: </span><span><strong class="def-name">up</strong> <var class="def-var-arguments">[count]</var><a class="copiable-link" href="#index-up"> ¶</a></span></dt>
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<dd><p>Select a calling stack frame.
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</p>
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<p>Select and print stack frames that called this one.
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An argument says how many frames up to go.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-down"><span class="category-def">REPL Command: </span><span><strong class="def-name">down</strong> <var class="def-var-arguments">[count]</var><a class="copiable-link" href="#index-down"> ¶</a></span></dt>
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<dd><p>Select a called stack frame.
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</p>
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<p>Select and print stack frames called by this one.
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An argument says how many frames down to go.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-frame"><span class="category-def">REPL Command: </span><span><strong class="def-name">frame</strong> <var class="def-var-arguments">[idx]</var><a class="copiable-link" href="#index-frame"> ¶</a></span></dt>
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<dd><p>Show a frame.
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</p>
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<p>Show the selected frame. With an argument, select a frame by index,
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then show it.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-locals"><span class="category-def">REPL Command: </span><span><strong class="def-name">locals</strong><a class="copiable-link" href="#index-locals"> ¶</a></span></dt>
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<dd><p>Show local variables.
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</p>
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<p>Show locally-bound variables in the selected frame.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-error_002dmessage"><span class="category-def">REPL Command: </span><span><strong class="def-name">error-message</strong><a class="copiable-link" href="#index-error_002dmessage"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-error"><span class="category-def">REPL Command: </span><span><strong class="def-name">error</strong><a class="copiable-link" href="#index-error"> ¶</a></span></dt>
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<dd><p>Show error message.
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</p>
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<p>Display the message associated with the error that started the current
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debugging REPL.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-registers"><span class="category-def">REPL Command: </span><span><strong class="def-name">registers</strong><a class="copiable-link" href="#index-registers"> ¶</a></span></dt>
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<dd><p>Show the VM registers associated with the current frame.
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</p>
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<p>See <a class="xref" href="Stack-Layout.html">Stack Layout</a>, for more information on VM stack frames.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-width"><span class="category-def">REPL Command: </span><span><strong class="def-name">width</strong> <var class="def-var-arguments">[cols]</var><a class="copiable-link" href="#index-width"> ¶</a></span></dt>
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<dd><p>Sets the number of display columns in the output of <code class="code">,backtrace</code>
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and <code class="code">,locals</code> to <var class="var">cols</var>. If <var class="var">cols</var> is not given, the width
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of the terminal is used.
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</p></dd></dl>
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<p>The next 3 commands work at any REPL.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-break"><span class="category-def">REPL Command: </span><span><strong class="def-name">break</strong> <var class="def-var-arguments">proc</var><a class="copiable-link" href="#index-break"> ¶</a></span></dt>
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<dd><p>Set a breakpoint at <var class="var">proc</var>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-break_002dat_002dsource"><span class="category-def">REPL Command: </span><span><strong class="def-name">break-at-source</strong> <var class="def-var-arguments">file line</var><a class="copiable-link" href="#index-break_002dat_002dsource"> ¶</a></span></dt>
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<dd><p>Set a breakpoint at the given source location.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-tracepoint"><span class="category-def">REPL Command: </span><span><strong class="def-name">tracepoint</strong> <var class="def-var-arguments">proc</var><a class="copiable-link" href="#index-tracepoint"> ¶</a></span></dt>
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<dd><p>Set a tracepoint on the given procedure. This will cause all calls to
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the procedure to print out a tracing message. See <a class="xref" href="Tracing-Traps.html">Tracing Traps</a>, for
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more information.
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</p></dd></dl>
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<p>The rest of the commands in this subsection all apply only when the
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stack is <em class="dfn">continuable</em> — in other words when it makes sense for
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the program that the stack comes from to continue running. Usually this
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means that the program stopped because of a trap or a breakpoint.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-step"><span class="category-def">REPL Command: </span><span><strong class="def-name">step</strong><a class="copiable-link" href="#index-step"> ¶</a></span></dt>
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<dd><p>Tell the debugged program to step to the next source location.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-next"><span class="category-def">REPL Command: </span><span><strong class="def-name">next</strong><a class="copiable-link" href="#index-next"> ¶</a></span></dt>
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<dd><p>Tell the debugged program to step to the next source location in the
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same frame. (See <a class="ref" href="Traps.html">Traps</a> for the details of how this works.)
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-finish"><span class="category-def">REPL Command: </span><span><strong class="def-name">finish</strong><a class="copiable-link" href="#index-finish"> ¶</a></span></dt>
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<dd><p>Tell the program being debugged to continue running until the completion
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of the current stack frame, and at that time to print the result and
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reenter the REPL.
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</p></dd></dl>
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</div>
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<hr>
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<div class="nav-panel">
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<p>
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Next: <a href="Inspect-Commands.html">Inspect Commands</a>, Previous: <a href="Profile-Commands.html">Profile Commands</a>, Up: <a href="REPL-Commands.html">REPL Commands</a> [<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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</div>
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</body>
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</html>
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