97 lines
5 KiB
HTML
97 lines
5 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>Trampoline Instructions (Guile Reference Manual)</title>
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<meta name="description" content="Trampoline Instructions (Guile Reference Manual)">
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<meta name="keywords" content="Trampoline Instructions (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="Instruction-Set.html" rel="up" title="Instruction Set">
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<link href="Non_002dLocal-Control-Flow-Instructions.html" rel="next" title="Non-Local Control Flow Instructions">
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<link href="Shuffling-Instructions.html" rel="prev" title="Shuffling Instructions">
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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="Trampoline-Instructions">
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<div class="nav-panel">
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<p>
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Next: <a href="Non_002dLocal-Control-Flow-Instructions.html" accesskey="n" rel="next">Non-Local Control Flow Instructions</a>, Previous: <a href="Shuffling-Instructions.html" accesskey="p" rel="prev">Shuffling Instructions</a>, Up: <a href="Instruction-Set.html" accesskey="u" rel="up">Instruction Set</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="Trampoline-Instructions-1"><span>9.3.7.4 Trampoline Instructions<a class="copiable-link" href="#Trampoline-Instructions-1"> ¶</a></span></h4>
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<p>Though most applicable objects in Guile are procedures implemented in
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bytecode, not all are. There are primitives, continuations, and other
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procedure-like objects that have their own calling convention. Instead
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of adding special cases to the <code class="code">call</code> instruction, Guile wraps
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these other applicable objects in VM trampoline procedures, then
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provides special support for these objects in bytecode.
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</p>
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<p>Trampoline procedures are typically generated by Guile at runtime, for
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example in response to a call to <code class="code">scm_c_make_gsubr</code>. As such, a
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compiler probably shouldn’t emit code with these instructions. However,
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it’s still interesting to know how these things work, so we document
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these trampoline instructions here.
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</p>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-subr_002dcall"><span class="category-def">Instruction: </span><span><strong class="def-name">subr-call</strong> <code class="def-code-arguments">c24:<var class="var">idx</var></code><a class="copiable-link" href="#index-subr_002dcall"> ¶</a></span></dt>
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<dd><p>Call a subr, passing all locals in this frame as arguments, and storing
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the results on the stack, ready to be returned.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-foreign_002dcall"><span class="category-def">Instruction: </span><span><strong class="def-name">foreign-call</strong> <code class="def-code-arguments">c12:<var class="var">cif-idx</var> c12:<var class="var">ptr-idx</var></code><a class="copiable-link" href="#index-foreign_002dcall"> ¶</a></span></dt>
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<dd><p>Call a foreign function. Fetch the <var class="var">cif</var> and foreign pointer from
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<var class="var">cif-idx</var> and <var class="var">ptr-idx</var> closure slots of the callee. Arguments
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are taken from the stack, and results placed on the stack, ready to be
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returned.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-builtin_002dref"><span class="category-def">Instruction: </span><span><strong class="def-name">builtin-ref</strong> <code class="def-code-arguments">s12:<var class="var">dst</var> c12:<var class="var">idx</var></code><a class="copiable-link" href="#index-builtin_002dref"> ¶</a></span></dt>
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<dd><p>Load a builtin stub by index into <var class="var">dst</var>.
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</p></dd></dl>
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</div>
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</body>
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</html>
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