129 lines
6.4 KiB
HTML
129 lines
6.4 KiB
HTML
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<!DOCTYPE html>
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<html>
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<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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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>Stack Capture (Guile Reference Manual)</title>
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<meta name="description" content="Stack Capture (Guile Reference Manual)">
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<meta name="keywords" content="Stack Capture (Guile Reference Manual)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content=".texi2any-real">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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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="Evaluation-Model.html" rel="up" title="Evaluation Model">
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<link href="Stacks.html" rel="next" title="Stacks">
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<style type="text/css">
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<!--
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a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em}
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</style>
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<link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css">
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</head>
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<body lang="en">
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<div class="subsubsection-level-extent" id="Stack-Capture">
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<div class="nav-panel">
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<p>
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Next: <a href="Stacks.html" accesskey="n" rel="next">Stacks</a>, Up: <a href="Evaluation-Model.html" accesskey="u" rel="up">Evaluation and the Scheme Stack</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="Stack-Capture-1"><span>6.26.1.1 Stack Capture<a class="copiable-link" href="#Stack-Capture-1"> ¶</a></span></h4>
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<p>A Scheme program can use the <code class="code">make-stack</code> primitive anywhere in its
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code, with first arg <code class="code">#t</code>, to construct a Scheme value that
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describes the Scheme stack at that point.
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</p>
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<div class="example lisp">
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<pre class="lisp-preformatted">(make-stack #t)
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⇒
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#<stack 25205a0>
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</pre></div>
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<p>Use <code class="code">start-stack</code> to limit the stack extent captured by future
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<code class="code">make-stack</code> calls.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-make_002dstack"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-stack</strong> <var class="def-var-arguments">obj arg …</var><a class="copiable-link" href="#index-make_002dstack"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fmake_005fstack"><span class="category-def">C Function: </span><span><strong class="def-name">scm_make_stack</strong> <var class="def-var-arguments">(obj, args)</var><a class="copiable-link" href="#index-scm_005fmake_005fstack"> ¶</a></span></dt>
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<dd><p>Create a new stack. If <var class="var">obj</var> is <code class="code">#t</code>, the current
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evaluation stack is used for creating the stack frames,
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otherwise the frames are taken from <var class="var">obj</var> (which must be
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a continuation or a frame object).
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</p>
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<p><var class="var">arg</var> … can be any combination of integer, procedure, address
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range, and prompt tag values.
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</p>
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<p>These values specify various ways of cutting away uninteresting stack
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frames from the top and bottom of the stack that <code class="code">make-stack</code>
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returns. They come in pairs like this: <code class="code">(<var class="var">inner_cut_1</var>
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<var class="var">outer_cut_1</var> <var class="var">inner_cut_2</var> <var class="var">outer_cut_2</var> …)</code>.
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</p>
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<p>Each <var class="var">inner_cut_i</var> can be an integer, a procedure, an address range,
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or a prompt tag. An integer means to cut away exactly that number of
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frames. A procedure means to cut away all frames up to but excluding
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the frame whose procedure matches the specified one. An address range
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is a pair of integers indicating the low and high addresses of a
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procedure’s code, and is the same as cutting away to a procedure (though
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with less work). Anything else is interpreted as a prompt tag which
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cuts away all frames that are inside a prompt with the given tag.
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</p>
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<p>Each <var class="var">outer_cut_i</var> can likewise be an integer, a procedure, an
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address range, or a prompt tag. An integer means to cut away that
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number of frames. A procedure means to cut away frames down to but
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excluding the frame whose procedure matches the specified one. An
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address range is the same, but with the procedure’s code specified as an
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address range. Anything else is taken to be a prompt tag, which cuts
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away all frames that are outside a prompt with the given tag.
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</p>
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<p>If the <var class="var">outer_cut_i</var> of the last pair is missing, it is taken as 0.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-start_002dstack"><span class="category-def">Scheme Syntax: </span><span><strong class="def-name">start-stack</strong> <var class="def-var-arguments">id exp</var><a class="copiable-link" href="#index-start_002dstack"> ¶</a></span></dt>
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<dd><p>Evaluate <var class="var">exp</var> on a new calling stack with identity <var class="var">id</var>. If
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<var class="var">exp</var> is interrupted during evaluation, backtraces will not display
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frames farther back than <var class="var">exp</var>’s top-level form. This macro is a
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way of artificially limiting backtraces and stack procedures, largely as
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a convenience to the user.
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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="Stacks.html">Stacks</a>, Up: <a href="Evaluation-Model.html">Evaluation and the Scheme Stack</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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