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150 lines
5.8 KiB
HTML
150 lines
5.8 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
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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 the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Plugins attr (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Plugins attr (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Plugins attr (GNU Compiler Collection (GCC) Internals)">
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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="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Plugins.html#Plugins" rel="up" title="Plugins">
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<link href="Plugins-recording.html#Plugins-recording" rel="next" title="Plugins recording">
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<link href="Plugins-description.html#Plugins-description" rel="prev" title="Plugins description">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smallexample {margin-left: 3.2em}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Plugins-attr"></a>
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<div class="header">
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<p>
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Next: <a href="Plugins-recording.html#Plugins-recording" accesskey="n" rel="next">Plugins recording</a>, Previous: <a href="Plugins-description.html#Plugins-description" accesskey="p" rel="prev">Plugins description</a>, Up: <a href="Plugins.html#Plugins" accesskey="u" rel="up">Plugins</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Registering-custom-attributes-or-pragmas"></a>
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<h3 class="section">24.6 Registering custom attributes or pragmas</h3>
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<p>For analysis (or other) purposes it is useful to be able to add custom
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attributes or pragmas.
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</p>
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<p>The <code>PLUGIN_ATTRIBUTES</code> callback is called during attribute
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registration. Use the <code>register_attribute</code> function to register
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custom attributes.
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</p>
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<div class="smallexample">
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<pre class="smallexample">/* Attribute handler callback */
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static tree
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handle_user_attribute (tree *node, tree name, tree args,
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int flags, bool *no_add_attrs)
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{
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return NULL_TREE;
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}
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/* Attribute definition */
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static struct attribute_spec user_attr =
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{ "user", 1, 1, false, false, false, false, handle_user_attribute, NULL };
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/* Plugin callback called during attribute registration.
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Registered with register_callback (plugin_name, PLUGIN_ATTRIBUTES, register_attributes, NULL)
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*/
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static void
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register_attributes (void *event_data, void *data)
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{
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warning (0, G_("Callback to register attributes"));
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register_attribute (&user_attr);
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}
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</pre></div>
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<p>The <i>PLUGIN_PRAGMAS</i> callback is called once during pragmas
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registration. Use the <code>c_register_pragma</code>,
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<code>c_register_pragma_with_data</code>,
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<code>c_register_pragma_with_expansion</code>,
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<code>c_register_pragma_with_expansion_and_data</code> functions to register
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custom pragmas and their handlers (which often want to call
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<code>pragma_lex</code>) from <samp>c-family/c-pragma.h</samp>.
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</p>
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<div class="smallexample">
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<pre class="smallexample">/* Plugin callback called during pragmas registration. Registered with
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register_callback (plugin_name, PLUGIN_PRAGMAS,
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register_my_pragma, NULL);
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*/
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static void
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register_my_pragma (void *event_data, void *data)
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{
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warning (0, G_("Callback to register pragmas"));
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c_register_pragma ("GCCPLUGIN", "sayhello", handle_pragma_sayhello);
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}
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</pre></div>
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<p>It is suggested to pass <code>"GCCPLUGIN"</code> (or a short name identifying
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your plugin) as the “space” argument of your pragma.
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</p>
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<p>Pragmas registered with <code>c_register_pragma_with_expansion</code> or
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<code>c_register_pragma_with_expansion_and_data</code> support
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preprocessor expansions. For example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">#define NUMBER 10
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#pragma GCCPLUGIN foothreshold (NUMBER)
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</pre></div>
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</body>
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</html>
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