104 lines
4.5 KiB
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104 lines
4.5 KiB
HTML
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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<title>Traps (Guile Reference Manual)</title>
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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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<div class="subsection-level-extent" id="Traps">
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<p>
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Next: <a href="GDB-Support.html" accesskey="n" rel="next">GDB Support</a>, Previous: <a href="Programmatic-Error-Handling.html" accesskey="p" rel="prev">Programmatic Error Handling</a>, Up: <a href="Debugging.html" accesskey="u" rel="up">Debugging Infrastructure</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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<hr>
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<h4 class="subsection" id="Traps-1"><span>6.26.4 Traps<a class="copiable-link" href="#Traps-1"> ¶</a></span></h4>
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<a class="index-entry-id" id="index-Traps"></a>
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<a class="index-entry-id" id="index-VM-hooks"></a>
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<a class="index-entry-id" id="index-Breakpoints"></a>
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<a class="index-entry-id" id="index-Trace"></a>
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<a class="index-entry-id" id="index-Tracing"></a>
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<a class="index-entry-id" id="index-Code-coverage"></a>
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<a class="index-entry-id" id="index-Profiling"></a>
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<p>Guile’s virtual machine can be configured to call out at key points to
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arbitrary user-specified procedures.
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</p>
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<p>In principle, these <em class="dfn">hooks</em> allow Scheme code to implement any model
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it chooses for examining the evaluation stack as program execution
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proceeds, and for suspending execution to be resumed later.
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</p>
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<p>VM hooks are very low-level, though, and so Guile also has a library of
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higher-level <em class="dfn">traps</em> on top of the VM hooks. A trap is an execution
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condition that, when fulfilled, will fire a handler. For example, Guile
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defines a trap that fires when control reaches a certain source
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location.
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</p>
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<p>Finally, Guile also defines a third level of abstractions: per-thread
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<em class="dfn">trap states</em>. A trap state exists to give names to traps, and to
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hold on to the set of traps so that they can be enabled, disabled, or
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removed. The trap state infrastructure defines the most useful
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abstractions for most cases. For example, Guile’s REPL uses trap state
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functions to set breakpoints and tracepoints.
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</p>
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<p>The following subsections describe all this in detail, for both the
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user wanting to use traps, and the developer interested in
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understanding how the interface hangs together.
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</p>
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<ul class="mini-toc">
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<li><a href="VM-Hooks.html" accesskey="1">VM Hooks</a></li>
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<li><a href="Trap-Interface.html" accesskey="2">Trap Interface</a></li>
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<li><a href="Low_002dLevel-Traps.html" accesskey="3">Low-Level Traps</a></li>
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<li><a href="Tracing-Traps.html" accesskey="4">Tracing Traps</a></li>
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<li><a href="Trap-States.html" accesskey="5">Trap States</a></li>
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<li><a href="High_002dLevel-Traps.html" accesskey="6">High-Level Traps</a></li>
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</ul>
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