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113 lines
4.9 KiB
HTML
113 lines
4.9 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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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>Attributes (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Attributes (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Attributes (GNU Compiler Collection (GCC) Internals)">
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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="GENERIC.html#GENERIC" rel="up" title="GENERIC">
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<link href="Expression-trees.html#Expression-trees" rel="next" title="Expression trees">
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<link href="Adding-new-DECL-node-types.html#Adding-new-DECL-node-types" rel="prev" title="Adding new DECL node types">
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</head>
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<body lang="en">
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<a name="Attributes"></a>
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<div class="header">
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<p>
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Next: <a href="Expression-trees.html#Expression-trees" accesskey="n" rel="next">Expression trees</a>, Previous: <a href="Declarations.html#Declarations" accesskey="p" rel="prev">Declarations</a>, Up: <a href="GENERIC.html#GENERIC" accesskey="u" rel="up">GENERIC</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="Attributes-in-trees"></a>
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<h3 class="section">11.5 Attributes in trees</h3>
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<a name="index-attributes"></a>
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<p>Attributes, as specified using the <code>__attribute__</code> keyword, are
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represented internally as a <code>TREE_LIST</code>. The <code>TREE_PURPOSE</code>
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is the name of the attribute, as an <code>IDENTIFIER_NODE</code>. The
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<code>TREE_VALUE</code> is a <code>TREE_LIST</code> of the arguments of the
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attribute, if any, or <code>NULL_TREE</code> if there are no arguments; the
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arguments are stored as the <code>TREE_VALUE</code> of successive entries in
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the list, and may be identifiers or expressions. The <code>TREE_CHAIN</code>
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of the attribute is the next attribute in a list of attributes applying
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to the same declaration or type, or <code>NULL_TREE</code> if there are no
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further attributes in the list.
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</p>
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<p>Attributes may be attached to declarations and to types; these
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attributes may be accessed with the following macros. All attributes
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are stored in this way, and many also cause other changes to the
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declaration or type or to other internal compiler data structures.
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</p>
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<dl>
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<dt><a name="index-DECL_005fATTRIBUTES"></a>Tree Macro: <em>tree</em> <strong>DECL_ATTRIBUTES</strong> <em>(tree <var>decl</var>)</em></dt>
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<dd><p>This macro returns the attributes on the declaration <var>decl</var>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TYPE_005fATTRIBUTES"></a>Tree Macro: <em>tree</em> <strong>TYPE_ATTRIBUTES</strong> <em>(tree <var>type</var>)</em></dt>
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<dd><p>This macro returns the attributes on the type <var>type</var>.
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</p></dd></dl>
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</body>
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</html>
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