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89 lines
3.9 KiB
HTML
89 lines
3.9 KiB
HTML
4 years ago
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<title>Attributes - GNU Compiler Collection (GCC) Internals</title>
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<link rel="up" href="GENERIC.html#GENERIC" title="GENERIC">
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<link rel="prev" href="Declarations.html#Declarations" title="Declarations">
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<link rel="next" href="Expression-trees.html#Expression-trees" title="Expression trees">
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Copyright (C) 1988-2015 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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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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<div class="node">
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<a name="Attributes"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Expression-trees.html#Expression-trees">Expression trees</a>,
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Previous: <a rel="previous" accesskey="p" href="Declarations.html#Declarations">Declarations</a>,
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Up: <a rel="up" accesskey="u" href="GENERIC.html#GENERIC">GENERIC</a>
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<hr>
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</div>
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<h3 class="section">10.5 Attributes in trees</h3>
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<p><a name="index-attributes-1817"></a>
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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>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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<div class="defun">
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— Tree Macro: tree <b>DECL_ATTRIBUTES</b> (<var>tree decl</var>)<var><a name="index-DECL_005fATTRIBUTES-1818"></a></var><br>
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<blockquote><p>This macro returns the attributes on the declaration <var>decl</var>.
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</p></blockquote></div>
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<div class="defun">
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— Tree Macro: tree <b>TYPE_ATTRIBUTES</b> (<var>tree type</var>)<var><a name="index-TYPE_005fATTRIBUTES-1819"></a></var><br>
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<blockquote><p>This macro returns the attributes on the type <var>type</var>.
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</p></blockquote></div>
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<!-- Expressions -->
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