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118 lines
4.7 KiB
HTML
118 lines
4.7 KiB
HTML
4 years ago
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<html lang="en">
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<head>
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<title>Plugins attr - GNU Compiler Collection (GCC) Internals</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="GNU Compiler Collection (GCC) Internals">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Plugins.html#Plugins" title="Plugins">
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<link rel="prev" href="Plugins-description.html#Plugins-description" title="Plugins description">
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<link rel="next" href="Plugins-recording.html#Plugins-recording" title="Plugins recording">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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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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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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<meta http-equiv="Content-Style-Type" content="text/css">
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<style type="text/css"><!--
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pre.display { font-family:inherit }
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pre.format { font-family:inherit }
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pre.smalldisplay { font-family:inherit; font-size:smaller }
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pre.smallformat { font-family:inherit; font-size:smaller }
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span.roman { font-family:serif; font-weight:normal; }
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span.sansserif { font-family:sans-serif; font-weight:normal; }
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="Plugins-attr"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Plugins-recording.html#Plugins-recording">Plugins recording</a>,
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Previous: <a rel="previous" accesskey="p" href="Plugins-description.html#Plugins-description">Plugins description</a>,
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Up: <a rel="up" accesskey="u" href="Plugins.html#Plugins">Plugins</a>
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<hr>
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</div>
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<h3 class="section">23.6 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>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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<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, handle_user_attribute, false };
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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>
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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><span class="file">c-family/c-pragma.h</span></samp>.
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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>
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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>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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<pre class="smallexample"> #define NUMBER 10
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#pragma GCCPLUGIN foothreshold (NUMBER)
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</pre>
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</body></html>
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