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106 lines
4.2 KiB
HTML
106 lines
4.2 KiB
HTML
4 years ago
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<html lang="en">
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<head>
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<title>Plugins pass - 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="Plugin-API.html#Plugin-API" title="Plugin API">
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<link rel="next" href="Plugins-GC.html#Plugins-GC" title="Plugins GC">
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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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<style type="text/css"><!--
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pre.display { font-family:inherit }
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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-pass"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Plugins-GC.html#Plugins-GC">Plugins GC</a>,
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Previous: <a rel="previous" accesskey="p" href="Plugin-API.html#Plugin-API">Plugin API</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">23.3 Interacting with the pass manager</h3>
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<p>There needs to be a way to add/reorder/remove passes dynamically. This
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is useful for both analysis plugins (plugging in after a certain pass
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such as CFG or an IPA pass) and optimization plugins.
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<p>Basic support for inserting new passes or replacing existing passes is
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provided. A plugin registers a new pass with GCC by calling
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<code>register_callback</code> with the <code>PLUGIN_PASS_MANAGER_SETUP</code>
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event and a pointer to a <code>struct register_pass_info</code> object defined as follows
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<pre class="smallexample"> enum pass_positioning_ops
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{
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PASS_POS_INSERT_AFTER, // Insert after the reference pass.
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PASS_POS_INSERT_BEFORE, // Insert before the reference pass.
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PASS_POS_REPLACE // Replace the reference pass.
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};
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struct register_pass_info
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{
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struct opt_pass *pass; /* New pass provided by the plugin. */
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const char *reference_pass_name; /* Name of the reference pass for hooking
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up the new pass. */
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int ref_pass_instance_number; /* Insert the pass at the specified
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instance number of the reference pass. */
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/* Do it for every instance if it is 0. */
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enum pass_positioning_ops pos_op; /* how to insert the new pass. */
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};
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/* Sample plugin code that registers a new pass. */
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int
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plugin_init (struct plugin_name_args *plugin_info,
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struct plugin_gcc_version *version)
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{
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struct register_pass_info pass_info;
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...
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/* Code to fill in the pass_info object with new pass information. */
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...
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/* Register the new pass. */
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register_callback (plugin_info->base_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &pass_info);
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...
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}
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</pre>
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</body></html>
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