102 lines
5.1 KiB
HTML
102 lines
5.1 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>Combining with C (Guile Reference Manual)</title>
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<meta name="description" content="Combining with C (Guile Reference Manual)">
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<meta name="keywords" content="Combining with C (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="Introduction.html" rel="up" title="Introduction">
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<link href="Guile-and-the-GNU-Project.html" rel="next" title="Guile and the GNU Project">
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<link href="Guile-and-Scheme.html" rel="prev" title="Guile and Scheme">
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</head>
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<body lang="en">
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<div class="section-level-extent" id="Combining-with-C">
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<div class="nav-panel">
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<p>
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Next: <a href="Guile-and-the-GNU-Project.html" accesskey="n" rel="next">Guile and the GNU Project</a>, Previous: <a href="Guile-and-Scheme.html" accesskey="p" rel="prev">Guile and Scheme</a>, Up: <a href="Introduction.html" accesskey="u" rel="up">Introduction</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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<h3 class="section" id="Combining-with-C-Code"><span>1.2 Combining with C Code<a class="copiable-link" href="#Combining-with-C-Code"> ¶</a></span></h3>
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<p>Like a shell, Guile can run interactively—reading expressions from the user,
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evaluating them, and displaying the results—or as a script interpreter,
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reading and executing Scheme code from a file. Guile also provides an object
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library, <em class="dfn">libguile</em>, that allows other applications to easily incorporate a
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complete Scheme interpreter. An application can then use Guile as an extension
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language, a clean and powerful configuration language, or as multi-purpose
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“glue”, connecting primitives provided by the application. It is easy to call
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Scheme code from C code and vice versa, giving the application designer full
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control of how and when to invoke the interpreter. Applications can add new
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functions, data types, control structures, and even syntax to Guile, creating a
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domain-specific language tailored to the task at hand, but based on a robust
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language design.
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</p>
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<p>This kind of combination is helped by four aspects of Guile’s design
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and history. First is that Guile has always been targeted as an
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extension language. Hence its C API has always been of great
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importance, and has been developed accordingly. Second and third are
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rather technical points—that Guile uses conservative garbage
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collection, and that it implements the Scheme concept of continuations
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by copying and reinstating the C stack—but whose practical
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consequence is that most existing C code can be glued into Guile as
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is, without needing modifications to cope with strange Scheme
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execution flows. Last is the module system, which helps extensions to
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coexist without stepping on each others’ toes.
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</p>
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<p>Guile’s module system allows one to break up a large program into
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manageable sections with well-defined interfaces between them.
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Modules may contain a mixture of interpreted and compiled code; Guile
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can use either static or dynamic linking to incorporate compiled code.
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Modules also encourage developers to package up useful collections of
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routines for general distribution; as of this writing, one can find
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Emacs interfaces, database access routines, compilers, <abbr class="acronym">GUI</abbr>
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toolkit interfaces, and <abbr class="acronym">HTTP</abbr> client functions, among others.
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</p>
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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="Guile-and-the-GNU-Project.html">Guile and the GNU Project</a>, Previous: <a href="Guile-and-Scheme.html">Guile and Scheme</a>, Up: <a href="Introduction.html">Introduction</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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