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Introduction.html
<!DOCTYPE html> <html> <!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <!-- This manual is for libffi, a portable foreign function interface library. Copyright © 2008-2024 Anthony Green and Red Hat, Inc. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. --> <title>Introduction (libffi: the portable foreign function interface library)</title> <meta name="description" content="Introduction (libffi: the portable foreign function interface library)"> <meta name="keywords" content="Introduction (libffi: the portable foreign function interface library)"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <meta name="viewport" content="width=device-width,initial-scale=1"> <link href="index.html" rel="start" title="Top"> <link href="Index.html" rel="index" title="Index"> <link href="index.html" rel="up" title="Top"> <link href="Using-libffi.html" rel="next" title="Using libffi"> <link href="index.html" rel="prev" title="Top"> <style type="text/css"> <!-- a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em} span:hover a.copiable-link {visibility: visible} --> </style> </head> <body lang="en"> <div class="chapter-level-extent" id="Introduction"> <div class="nav-panel"> <p> Next: <a href="Using-libffi.html" accesskey="n" rel="next">Using libffi</a>, Previous: <a href="index.html" accesskey="p" rel="prev">libffi</a>, Up: <a href="index.html" accesskey="u" rel="up">libffi</a> [<a href="Index.html" title="Index" rel="index">Index</a>]</p> </div> <hr> <h2 class="chapter" id="What-is-libffi_003f"><span>1 What is libffi?<a class="copiable-link" href="#What-is-libffi_003f"> ¶</a></span></h2> <p>Compilers for high level languages generate code that follow certain conventions. These conventions are necessary, in part, for separate compilation to work. One such convention is the <em class="dfn">calling convention</em>. The calling convention is a set of assumptions made by the compiler about where function arguments will be found on entry to a function. A calling convention also specifies where the return value for a function is found. The calling convention is also sometimes called the <em class="dfn">ABI</em> or <em class="dfn">Application Binary Interface</em>. <a class="index-entry-id" id="index-calling-convention"></a> <a class="index-entry-id" id="index-ABI"></a> <a class="index-entry-id" id="index-Application-Binary-Interface"></a> </p> <p>Some programs may not know at the time of compilation what arguments are to be passed to a function. For instance, an interpreter may be told at run-time about the number and types of arguments used to call a given function. <code class="code">libffi</code> can be used in such programs to provide a bridge from the interpreter program to compiled code. </p> <p>The <code class="code">libffi</code> library provides a portable, high level programming interface to various calling conventions. This allows a programmer to call any function specified by a call interface description at run time. </p> <p><abbr class="acronym">FFI</abbr> stands for Foreign Function Interface. A foreign function interface is the popular name for the interface that allows code written in one language to call code written in another language. The <code class="code">libffi</code> library really only provides the lowest, machine dependent layer of a fully featured foreign function interface. A layer must exist above <code class="code">libffi</code> that handles type conversions for values passed between the two languages. <a class="index-entry-id" id="index-FFI"></a> <a class="index-entry-id" id="index-Foreign-Function-Interface"></a> </p> </div> <hr> <div class="nav-panel"> <p> Next: <a href="Using-libffi.html">Using libffi</a>, Previous: <a href="index.html">libffi</a>, Up: <a href="index.html">libffi</a> [<a href="Index.html" title="Index" rel="index">Index</a>]</p> </div> </body> </html>
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